WO2023025580A1 - Procédé et dispositif de mise en contact électrique d'élément de batterie, module d'élément et batterie - Google Patents

Procédé et dispositif de mise en contact électrique d'élément de batterie, module d'élément et batterie Download PDF

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Publication number
WO2023025580A1
WO2023025580A1 PCT/EP2022/072254 EP2022072254W WO2023025580A1 WO 2023025580 A1 WO2023025580 A1 WO 2023025580A1 EP 2022072254 W EP2022072254 W EP 2022072254W WO 2023025580 A1 WO2023025580 A1 WO 2023025580A1
Authority
WO
WIPO (PCT)
Prior art keywords
connecting element
battery cells
groove
housing
battery
Prior art date
Application number
PCT/EP2022/072254
Other languages
German (de)
English (en)
Inventor
Roland Weixler
Arnold Lamm
Original Assignee
Ke-Tec Gmbh
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 Ke-Tec Gmbh filed Critical Ke-Tec Gmbh
Publication of WO2023025580A1 publication Critical patent/WO2023025580A1/fr

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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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • 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
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/167—Lids or covers characterised by the methods of assembling casings with lids by crimping
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • H01M50/291—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs characterised by their shape
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/505—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising a single busbar
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/514—Methods for interconnecting adjacent batteries or 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/545—Terminals formed by the casing of the cells

Definitions

  • the invention relates to a method and a device for electrically contacting at least one battery cell with an electrical connection element, as well as a cell module with a plurality of battery cells and a battery with at least one cell module.
  • High-voltage batteries for electrically powered vehicles such as hybrid, plug-in or electric vehicles, or for stationary applications, such as power suppliers or power storage, consist of many individual cells electrically connected in series and/or in parallel.
  • the individual cells are usually combined in so-called battery modules, each of which contains a certain number of battery cells as a cell pack, including the necessary equipment for their mechanical fixation, for electrical contacting and for temperature control (cooling, heating).
  • the battery modules typically 8 to 36 battery modules per battery, are in turn housed in a stable battery housing, which also contains the necessary equipment for electrical control and protection of the battery.
  • Such devices include, for example, battery management system (BMS), fuses, contactors for switching the electric current on and off, cell voltage monitoring electronics (cell supervision electronics CSE), ammeter and connections to the outside, such as power supply and current discharge, coolant supply and coolant discharge, battery control connection and the like.
  • Li-ion round cells of the types commonly known as 18650 and 21700 are used today diverse in consumer applications, industrial applications and automotive battery applications.
  • Another design with the common designation 4680 with a diameter of 46 mm and a length of 80 mm is about to be used in series production in high-voltage batteries.
  • the capacities or nominal capacities of standard cells of the 21700 format are around 5 Ah/18.2 Wh.
  • 2754 cells are connected.
  • 27 cells are electrically connected in parallel to form a cell pack and 102 of these cell packs are electrically connected in series as a so-called (27p/102s) connection.
  • a 100 kWh battery with the same cells then has a corresponding parallel/serial connection in the form of a (54p/102s) connection.
  • the commonly used contacting in the corresponding wiring with contacting rails and bonding to produce electrical connections represents a high effort from the point of view of construction and production.
  • the bonding for example on a shoulder of the housing cup of the battery cell, is not very reliable.
  • the current flow must take place via several parallel bonding wires per electrical pole, which is correspondingly expensive and time-consuming and can represent a source of error.
  • the object of the invention is to specify an improved method for electrically contacting at least one battery cell with an electrical connection element.
  • a further object is to create a device for such a method.
  • a further object is to create a cell module with a plurality of battery cells which are contacted using such a method.
  • a further object is to create a battery with at least one such cell module.
  • the invention is based on a method for electrically contacting at least one battery cell with a metal connecting element, which has a housing with a metal housing cup with a longitudinal axis, the housing cup having a groove running around the longitudinal axis at least in regions on an outer casing.
  • the connecting element is provided with at least one first opening, which is adapted to a cross section and/or diameter of the housing cup, in particular to the groove. Groove and first opening are brought together.
  • the housing cup is fixed in an essentially form-fitting manner, in particular at the groove, in the first opening of the connecting element.
  • Material of the metallic connecting element is deformed at the first opening after or during merging in such a way that deformed material flows into the groove of the at least one battery cell, in particular at least partially filling it. This allows an essentially form-fitting connection between the connecting element and the housing cup, in particular at the groove.
  • Round cells usually have a cover assembly with safety elements, which forms an electrical pole, for example the electrical positive pole, and a cylindrical metallic cup as the housing cup, which also represents the other electrical pole, for example the negative pole.
  • a cup can consist, for example, of an iron-nickel material, aluminum or the like.
  • the housing consisting of the cover assembly and the housing cup are usually connected via an insulating seal by crimping the housing cup.
  • This crimp seam is designed as a groove.
  • This crimping seam can advantageously be used as a groove which can accommodate material of the metallic connecting element.
  • the connecting element can advantageously be made of a ductile, electrically highly conductive material such as copper. However, other materials with good electrical conductivity can also be used. If the connecting element is made of a ductile material, the material can be deformed and deformed material can be accommodated in the groove. A form fit can essentially be formed as a result.
  • a connecting element designed as a contact plate can advantageously have electrical lines for a corresponding sensor system, for example to determine an electrical voltage or temperatures.
  • a non-positive and/or form-fitting electrically conductive connection between the housing cup and the connecting element can be achieved by utilizing the crimp seam designed as a groove. As a result, a secure electrical connection can also be established with neighboring battery cells via the connecting element.
  • connection technology can be implemented inexpensively with a simple device as a tool.
  • the connecting element has the first opening, with which the connecting element can be guided over the battery cell and then lowered until the opening is arranged level with the groove of the housing cup of the battery cell.
  • the material of the connecting element can then be deformed around the opening with a corresponding tool in such a way that the material flows into the groove and thus represents a substantially form-fitting connection of the connecting element to the housing cup of the battery cell.
  • Another advantage is that adjacent battery cells can be connected both electrically and mechanically via the connecting element, so that a mechanically stable cell assembly can be produced in this way, which can also be transported and installed individually, for example.
  • This can advantageously be done with a plate-like connecting element, with which several battery cells can also be contacted at the same time.
  • the connecting element can form a contacting plate which is connected directly to the housing cup of the respective battery cells.
  • the connecting element can be a suitably shaped wire element which is arranged in the groove and which is connected to a contacting plate which is indirectly connected to the battery cell or a plurality of battery cells via the wire element.
  • the wire element can, for example, be placed in the groove and in particular pressed into it.
  • the wire element is designed to be ductile for this purpose.
  • cost-effective contacting of battery cells connected in parallel and/or in series, in particular round cells can be achieved.
  • a suitable tool can be used to achieve fast, process-reliable contacting of cell assemblies of battery cells connected in parallel.
  • the contact shown achieves a high level of process reliability due to the essentially form-fitting connection of deformed material in the groove or material clipped there. Electrical connections with a high current carrying capacity can also be represented.
  • a contact plate with at least one first opening can be used as the connecting element and the at least one first opening is spaced axially from the groove of the at least one battery cell in the direction of the longitudinal axis and is arranged coaxially to the groove.
  • the connecting element and the housing cup can be brought together by means of a relative movement between the connecting element and the housing until the groove is arranged in the first opening. The material can be deformed around the first opening and flow into the groove.
  • the contact plate has the first opening, with which the contact plate can be guided over the battery cell and then lowered until the opening is arranged level with the groove of the housing cup of the battery cell.
  • the material of the contact plate around the opening can then be deformed with a suitable tool in such a way that the material flows into the groove and thus represents a non-positive and/or positive, in particular positive, connection of the contact plate to the housing cup of the battery cell.
  • a plurality of battery cells can be contacted at the same time by the connecting element designed as a contact plate.
  • a corresponding number of first openings is provided in the connecting element designed as a contact plate.
  • An electrical connection to the plurality of battery cells can be established in one step using a suitable tool.
  • a plurality of battery cells can be inserted into a device to carry out the relative movement between the connecting element and the housing cup, the device having a first device part on which positioning elements are arranged, in particular parallel to the longitudinal axis of the battery cells , between which the battery cells are arranged for merging with the connecting element.
  • the connecting element can be positioned with its first openings over the battery cells and the connecting element and battery cells can be brought together until the connecting element rests on bearing surfaces of the positioning elements.
  • the battery cells are expediently surrounded by positioning elements.
  • the device can have a second device part with stamping elements, which is placed on the connecting element. When the first and second device parts are brought together, the relative movement between the connecting element and the housing cup can take place.
  • the material of the connecting element is deformed around the groove at the first openings with the punch elements.
  • the material of the connecting element is deformed by pressing the stamping elements onto the bearing surfaces of the positioning elements.
  • the battery cells can be specifically aligned in parallel and stably positioned in the first device part, so that they can no longer move during the subsequent connection process.
  • the connecting element can then be guided over the battery cells, centered via dowel pins, in such a way that it can be guided with the first openings along the outer edge of the housing cup.
  • the cross-section of the first openings of the connecting element is preferably such that when the second part of the device is brought together with the first part of the device, the connecting element can be lowered over the housing cup in such a way that the connecting element is arranged at the level of the groove and is separated from the bearing surfaces of the positioning elements of the first part of the device counter bearing is held.
  • the material of the connecting element around the opening is deformed by pressing the stamping elements onto the bearing surfaces of the positioning elements in such a way that it flows into the groove and forms the stable, essentially form-fitting connection with the housing cup.
  • the positioning elements can taper in circumference at their free end, in particular open into dowel pins and the ends of the positioning elements can be guided through corresponding second openings in the connecting element until the connecting element rests on the bearing surfaces of the positioning elements.
  • the connecting element can be conveniently positioned using dowel pins.
  • the connecting element can rest on the upper edge of the positioning element as an abutment to the stamping elements of the second device part, so that the material of the connecting element can be deformed when the first and second device parts are brought together.
  • the dowel pins can protrude into second openings of the connecting element.
  • the bearing surfaces of the positioning elements are formed at the base of the dowel pins.
  • the bearing surfaces of the positioning elements are preferably arranged at the same axial height as the grooves of the battery cells.
  • the connecting element can have a first plate area with a plurality of first openings for a number of housing cups of battery cells and a second plate area with contacting surfaces, which in particular has an axial height offset to the first plate area.
  • the first plate area can be electrically connected to a first number of battery cells simultaneously in one work step by deforming the material around the first openings in the grooves of the housing cups, and the second plate area can be electrically connected to a second number of battery cells through the contacting surfaces, in particular be materially connected.
  • the contacting surfaces can advantageously be connected to the second plate area over a large area.
  • a first cell assembly can be conveniently produced by connecting the connecting element to the housing cups of the battery cells
  • a second cell assembly can be produced by connecting the connecting element to the contacting surfaces of the battery cells.
  • the battery cells of the first cell assembly are connected electrically in parallel to the connecting element via the housing cups, which are usually designed as a negative pole, for example, while the battery cells of the second cell assembly are connected electrically in parallel to the connecting element via the contact surfaces of the second pole, which is usually designed as a positive pole .
  • the first and the second cell assembly are each electrically connected in parallel and in series with one another via the metallic and therefore electrically conductive connecting element. In this way, a cell module consisting of the two cell assemblies can be produced in a favorable manner.
  • a metallic wire element with an annular area can additionally or alternatively be used as a connecting element, the annular opening of which is arranged around the groove of the respective battery cell.
  • the wire element can be pressed into the groove so that a form fit is formed.
  • the wire element can in particular be designed as a wire ring which is arranged around the housing cup of the battery cell, in particular in the groove.
  • the wire element is preferably formed from a material with good electrical conductivity, for example copper or another suitable metallic material.
  • the wire ring can then be pressed into the groove with an appropriate tool, resulting in a non-positive and/or positive connection with the housing cup.
  • compressed material can flow into the groove and at least partially fill it.
  • the thickness of the wire element can be designed depending on the desired current-carrying capacity.
  • All battery cells can be provided with a wire element, or some of the battery cells can be contacted with a wire element and another part of the battery cells can be contacted with a connecting element designed as a contact plate.
  • At least part of the wire element can be routed away from the housing cup as a first contacting element, in particular parallel to the longitudinal axis of the battery cell.
  • the housing cup of the battery cell can be electrically contacted in a favorable manner via this contacting element.
  • the second pole of the battery cell can be contacted directly or likewise via a second contacting element.
  • the contacting element can be placed reproducibly and easily accessible for electrical contacting.
  • the first contacting element can be electrically connected to a contact plate, in particular a contacting circuit board, in particular via a stamped grid, in particular with integrated busbars.
  • the first contacting element can expediently be electrically connected to a conventional printed circuit board, for example.
  • a cell connector circuit board which for example has a stamped grid, in particular with integrated busbars, can also be used to contact the battery cell via the contacting element.
  • Conventional soldering methods or welding methods such as laser welding, ultrasonic welding or bonding can be used here.
  • the electrical contacting can be facilitated by the reproducible and easily accessible placement of the contacting element.
  • the contact plate can advantageously map the busbars and implement the desired parallel and/or serial connection of the battery cells.
  • lines for sensors and/or the sensors themselves for determining current, voltage, and temperature can be integrated.
  • a second pole of the battery cell with a second electrical potential can be contacted with a second contacting element, which is electrically connected to the contacting circuit board, in particular is materially connected.
  • the second contacting element for contacting the second pole of the battery cell can also be connected, for example, to a printed circuit board or a dedicated cell connector board.
  • Conventional soldering processes or welding processes such as laser welding,
  • the battery cells can be arranged in the first device part and encapsulated with an in particular thermally conductive encapsulant, in particular in a mold designed as a blister film.
  • the battery cells can be mechanically connected to form a fixed, mechanically stable cell module.
  • the first device part remains part of the cell module and can be connected to a cooling plate or another cooling device, for example. If the potting compound also has a corresponding thermal conductivity, heat dissipation from the battery cells can be supported as a result.
  • the battery cell can be connected via a contact plate or another connecting element, as described above.
  • the first device part can remain on the battery cells as a base plate and be connected to a cooling device, in particular to a cooling plate.
  • the base plate thus represents part of the cell module and can be designed, for example, as part of a module housing. This simplifies the manufacturing process of a cell module.
  • a stable design of a cell module can be achieved.
  • Effective cooling of the cell module can also take place via the base plate, which can itself be designed as a cooling plate or at least advantageously heat-conducting. If the positioning elements are also designed to be heat-conducting, they can be used to cool the battery cells particularly effectively.
  • the encapsulated battery cells can be connected to the base plate with a cooling device, in particular a cooling plate, in particular glued or encapsulated.
  • a cooling device in particular a cooling plate, in particular glued or encapsulated.
  • a device for electrically contacting at least one battery cell using a method as described above at least comprising a first device part on which positioning elements, in particular vertical ones, are arranged which taper in circumference at their free end, in particular open into dowel pins, wherein a plurality of battery cells can be arranged between the positioning elements for contacting in the first device part and the ends of the positioning elements can be guided through corresponding second openings in a connecting element, in particular a contact plate, until the contact plate rests on a bearing surface of the positioning elements.
  • the device further comprises at least a second device part on which stamping elements are arranged, the second device part being intended to be placed on the contact plate and when the first and second device parts are brought together, the material around first openings of the contact plate with the stamping elements around a groove of the Housing cup to deform the battery cells so that the deformed material flows the groove.
  • the device is suitable for a connecting element designed as a contact plate.
  • the battery cells can be specifically aligned in parallel and held firmly in the first part of the device, so that they can no longer move during the subsequent connection process.
  • the connecting element can then be guided over the battery cells, centered over the positioning elements, in particular over dowel pins, so that it rests with the openings on the bearing surfaces of the positioning elements, in particular on the outer edge of the groove in the housing cup of the battery cells.
  • the cross-section of the first opening of the connecting element is preferably such that when the second part of the device is brought together with the first part of the device, the connecting element can be lowered over the housing cup in such a way that the connecting element is arranged at the level of the groove and is separated from the bearing surfaces of the positioning elements of the first part of the device counter bearing is held.
  • the material of the connecting element around the opening is deformed by pressing the stamping elements onto the bearing surfaces of the positioning elements in such a way that it flows into the groove and forms the stable, essentially form-fitting connection with the housing cup.
  • a cell module is proposed with a plurality of battery cells, which are electrically contacted according to a method described above, the battery cells each having a housing with a metallic housing can with a longitudinal axis, the outer casing of which has a first electrical pole of the battery cell forms a first electrical potential and whose housing cover forms a second pole with a second electrical potential, the respective housing cup having an at least partially circumferential groove on the outer casing.
  • the groove is in each case arranged in a metallic connecting element and material of the connecting element fills the respective groove at least in regions.
  • At least part of the respective grooves is arranged in a respective first opening of a connecting element designed as a contact plate, which contact plate extends transversely to the longitudinal axis, with deformed material around the respective first opening of the connecting element filling the groove at least in regions.
  • a connecting element designed as a contact plate, which contact plate extends transversely to the longitudinal axis, with deformed material around the respective first opening of the connecting element filling the groove at least in regions.
  • At least part of the respective grooves is arranged in an annular opening of a connecting element designed as a metallic wire element, which is arranged around the groove.
  • the wire element can be pressed into the groove in the area of the ring opening and fill it out at least in certain areas.
  • the wire element in the area of the ring opening can essentially be arranged in a form-fitting manner, at least in areas.
  • the wire element has a first contacting element, which is electrically connected to a contact plate extending transversely to the longitudinal axis.
  • the wire element can be designed as a single or multiple wire element.
  • the contact plate can have a first plate area with the openings for housing cups of battery cells and a second plate area, which in particular has an axial height offset to the first plate area, with contacting surfaces.
  • the first plate area is electrically connected to a first number of battery cells by deforming the material around the first openings in the respective grooves of battery cells, and the second plate area is electrically connected by contacting second poles of a second number of battery cells via the contacting surfaces, in particular materially connected.
  • the cell module can advantageously include a first cell assembly by connecting the connecting element to the housing cups of the battery cells and a second cell assembly by connecting the connecting element to the contacting surfaces of the battery cells.
  • the battery cells of the first cell assembly are connected electrically in parallel to the connecting element via the housing cups, which are usually designed as a negative pole, while the battery cells of the second cell assembly are electrically connected in parallel via the contact surfaces of the second pole, which is usually designed as a positive pole connected to the connector.
  • the first and the second cell assembly are each electrically connected in parallel and in series with one another via the metallic and therefore electrically conductive connecting element.
  • positioning elements can be arranged on a base plate, in particular positioning elements standing parallel to the longitudinal axis of the cells, which taper in circumference at their free end, in particular terminating in dowel pins with a smaller circumference than the respective positioning element.
  • the battery cells can be arranged between the positioning elements and the ends of the positioning elements can be guided through corresponding second openings in the contact plate, so that the contact plate rests on bearing surfaces of the positioning elements.
  • the battery cells can be cast with a casting compound, in particular in a mold designed as a blister film, and be contacted by means of the contact plate.
  • positioning elements in particular positioning elements parallel to the longitudinal axis of the cells, can be arranged on a base plate, the battery cells being arranged between the positioning elements and being contacted to the contact plate with first contacting elements.
  • the battery cells can be mechanically connected to form a fixed, mechanically stable cell module and, at the same time, reliably electrically contacted.
  • the handling of the cell module when transporting and assembling a battery is advantageously simplified.
  • the encapsulated battery cells can be connected to the base plate with a cooling device, in particular a cooling plate, in particular glued or encapsulated.
  • a cooling device in particular a cooling plate, in particular glued or encapsulated.
  • Effective cooling of the cell module can also take place via the base plate, which can itself be designed as a cooling plate or at least advantageously heat-conducting.
  • the positioning elements can be designed to be thermally conductive and connected to the housing cups of the battery cells and to the cooling device in a thermally conductive manner.
  • the potting compound can be thermally conductive. This allows a particularly effective cooling of the cell module.
  • a crimped seam between the housing cover and the housing cup can form the respective groove.
  • Round cells usually have a cover assembly with safety elements, which forms the electrical positive pole, for example, and a cylindrical metallic cup, which at the same time represents the electrical negative pole, for example.
  • the cover assembly and housing cup are usually connected via an insulating seal by crimping the housing cup.
  • This crimp seam is designed as a groove into which the deformed material of the metallic connecting element can flow.
  • an essentially form-fitting, electrically conductive connection between the housing cup and the connecting element can be achieved by utilizing the crimp seam designed as a groove.
  • a secure electrical connection can also be established with neighboring battery cells via the connecting element.
  • a battery with at least one cell module and a battery housing with at least one electrical contacting element is proposed, the cell module being arranged in the battery housing and being electrically connected to the at least one electrical contacting element.
  • the cell module includes a plurality of battery cells, which are electrically contacted according to a method described above.
  • the battery cells each have a housing with a metallic housing cup with a longitudinal axis, the outer shell of which forms a first electrical pole of the battery cell with a first electrical potential and the housing cover of which forms a second pole with a second electrical potential, with the respective housing cup on the outer shell having a has at least partially circumferential groove.
  • the groove is arranged in a metallic connecting element. Material of the connecting element encloses the respective groove at least in regions in a non-positive and/or positive manner.
  • the material of the connecting element can be deformed so that it flows into the groove and creates a substantially form-fitting connection.
  • the battery can advantageously have several of the cell modules described above, which can each be connected in parallel or in series, depending on the required voltage level and power requirement.
  • the connecting element for example a contact plate
  • the housing cup of the battery cells or the wire element adjacent battery cells in the cell modules are reliably connected both electrically and mechanically via the connecting element.
  • a reliable battery in particular for vehicles that can be driven electrically, can be produced in a simple and cost-effective manner.
  • the flexible interconnection of the cell modules makes it possible to achieve advantageous flexibility in the structure of the battery.
  • FIG. 1 shows an isometric representation of a cell module according to an exemplary embodiment of the invention in a first device part of the device for electrically contacting the battery cells;
  • FIG. 2 shows a longitudinal section through the cell module according to FIG. 1;
  • FIG. 3 shows an isometric representation of the cell module according to FIG. 1 with the second device part fed in from above;
  • Fig. 4 is a plan view of stamping elements of the second
  • FIG. 6 shows the cell module according to FIG. 1 with the second device part supplied
  • Fig. 7 shows the cell module of Figure 1 after pressing the
  • Fig. 8 shows the cell module of Figure 1 after pressing the
  • FIG. 9 shows an enlarged longitudinal section through a battery cell after the contact plate has been pressed;
  • 10 shows an isometric representation of a cell module according to a further exemplary embodiment of the invention with two cell assemblies in a first device part of the device for electrically contacting the battery cells;
  • FIG. 11 shows a longitudinal section through the cell module according to FIG. 10;
  • FIG. 12 shows an isometric representation of the cell module according to FIG. 10 with the second device part fed in from above;
  • FIG. 13 shows an isometric representation of a cell module according to a further exemplary embodiment of the invention with two
  • FIG. 14 shows a longitudinal section through the cell module according to FIG. 13;
  • FIG. 15 shows a schematic longitudinal section through a battery cell with a connecting element designed as a wire element according to a further exemplary embodiment of the invention
  • FIG. 16 shows an isometric view of the battery cell with a connecting element designed as a wire element according to FIG. 15;
  • FIG. 17 shows a further isometric view of the battery cell with a connecting element designed as a wire element according to FIG. 15; 18 shows an enlarged longitudinal section through the battery cell with a connecting element designed as a wire element according to FIG. 15 before the wire element is pressed;
  • FIG. 19 shows an enlarged longitudinal section through the battery cell with a connecting element designed as a wire element according to FIG. 15 after the wire element has been pressed;
  • FIG. 20 shows a schematic longitudinal section through three battery cells electrically connected to a contacting circuit board according to a further exemplary embodiment of the invention.
  • FIG. 21 shows a schematic longitudinal section through a battery with two cell modules arranged in a battery housing according to a further exemplary embodiment of the invention.
  • FIG. 1 shows an isometric view of a cell module 100 according to an exemplary embodiment of the invention in a first device part 52 of the device 50 for electrically contacting the battery cells 10, while FIG. 2 shows a longitudinal section through the cell module 100.
  • Figure 3 shows an isometric representation of the cell module 100 with the second device part 60 fed in from above.
  • Figure 4 shows a plan view of stamping elements 62 of the second device part 60.
  • the cell module 100 has a plurality of battery cells 10, which are designed as cylindrical round cells and are arranged standing next to one another in a dense packing of the cylindrical cell housing.
  • the battery cells 10 each have a housing with a metallic housing cup 12 with a longitudinal axis 15, the outer casing 20 of which forms a first electrical pole 16 of the battery cell 10 with a first electrical potential and the housing cover of which forms 14 forms a second pole 18 with a second electrical potential.
  • the first pole 16 is usually the negative electrical pole, while the second pole 18 represents the positive electrical pole of the battery cell 10 .
  • the housing cover 14 and the housing cup 12 are usually connected via an insulating sealing ring 26 by crimping the housing cup 12 with a beaded edge 24 .
  • the crimping seam is between the housing cover 14 and the housing shell 20 and forms a groove 22 in each case.
  • the respective housing cup 12 on the outer shell 20 has a groove 22 running around it, at least in some areas.
  • the housing cup 12 is usually designed as a metallic cup, for example made of an iron-nickel material, aluminum or the like.
  • the groove 22 is arranged in a metallic connecting element 30 in each case.
  • Deformed material 34 of the connecting element 30 fills the respective groove 22 at least in regions and thus provides a non-positive and/or positive, in particular a substantially positive, connection between the connecting element 30 and the housing cup 12.
  • the respective grooves 22 is arranged in a respective first opening 36 of the connecting element 30 designed as a contact plate 32 .
  • the contact plate 32 extends transversely to the longitudinal axis 15, with deformed material 34 around the respective first opening 36 of the connecting element 30 filling the groove 22 at least in regions.
  • the cell module 100 illustrated in the exemplary embodiment is manufactured using a method for electrically contacting at least one battery cell 10 with an electrical connection element 30, in which the connection element 30 is provided with at least one first opening 36, which has at least one cross section and/or diameter of the housing cup 12 at the groove 22 has. Thereafter, groove 22 and first opening 36 are brought together. After or during the bringing together of groove 22 and first opening 36, material 34 of metallic connecting element 30 is deformed at first opening 36 in such a way that deformed material 34 flows into groove 22 of the at least one battery cell 10 and, in particular, fills it at least in regions. In the exemplary embodiment shown, a contact plate 32 with at least one first opening 36 is used as the connecting element 30 .
  • the at least one first opening 36 is spaced axially from the groove of the at least one battery cell 10 in the direction of the longitudinal axis 15 and is arranged coaxially with the groove 22 .
  • the connecting element 30 and the housing cup 12 are brought together by means of a relative movement between the connecting element 30 and the housing cup 12 until the groove 22 is arranged in the first opening 36, the material 34 being deformed around the first opening 36 and flowing into the groove 22.
  • a plurality of battery cells 10 are inserted into a device 50 in order to carry out the relative movement between the connecting element 30 and the housing cup 12 .
  • the device 50 has a first device part 52 on which positioning elements 56 are arranged, in particular parallel to the longitudinal axis 15 of the battery cells 10, between which the battery cells 10 are arranged to be brought together with the connecting element 30 and are thus fixed for contacting.
  • the battery cells 10 are arranged in such a first part 52 of the device.
  • the connecting element 30 is positioned with its first openings 36 over the battery cells 10 and the connecting element 30 and battery cells 10 are brought together until the connecting element 30 rests on bearing surfaces 59 of the positioning elements 56 .
  • the positioning elements 56 open into dowel pins 58 with a smaller circumference than the positioning elements 56.
  • These dowel pins 58 are guided through corresponding second openings 38 (can be seen in Figure 8) in the connecting element 30 until the connecting element 30 is at the end of the dowel pins 58 rests on bearing surfaces (59) of the positioning elements 56.
  • Such a connecting element 30 designed as a contact plate 32 is brought together with the battery cells 10 in the exemplary embodiment in FIGS.
  • the device 50 also has a second device part 60 with stamping elements 62, which is placed on the connecting element 30 and which can be seen in FIGS.
  • a second device part 60 with stamping elements 62 which is placed on the connecting element 30 and which can be seen in FIGS.
  • the cell module 100 shown in FIGS. 1 to 4 has nine battery cells connected in parallel via the housing cups 12, ie the negative pole.
  • the contacting of the second poles 18 of the battery cells 10, ie the positive poles can take place, for example, in a known manner by attaching second contacting elements by means of bonding, laser welding, ultrasonic welding or other suitable methods for material connection.
  • the contacting process can be seen in sectional images of a battery cell 10 in various stages.
  • Figure 5 shows an enlarged sectional isometric view of the cell module 100 according to Figure 1 in the first device part 52 before the second device part 60 is fed in.
  • the battery cells 10 are arranged between the positioning elements 56 .
  • the connecting element 30 designed as a contact plate 32 is guided through the dowel pins 58 of the positioning elements 56 and rests on the bearing surfaces 59 of the positioning elements 56 .
  • the material 34 of the contact plate 32 is not yet deformed.
  • the groove 22 is still free of material 34.
  • FIG. 6 shows the cell module 100 with the second device part 60 supplied.
  • the stamping elements 62 are guided over the alignment pins 58 and accommodate them.
  • the stamp elements 62 rest on the contact plate 32 in this way.
  • the bearing surfaces 59 of the positioning elements 56, on which the contact plate 32 rests, represent the corresponding abutment for the build-up of pressure via the plunger elements 62. Since pressure has already been exerted on the material 34 of the contact plate 32 by the stamping elements 62, part of the material 34 has already flowed into the groove 22, as can be seen in the section in FIG.
  • FIG. 7 shows the cell module 100 after the contact plate 32 has been pressed with the second device part 60 .
  • the second device part 62 has been removed again.
  • the section shows how the material 34 of the contact plate 32 fills the groove 22 and thus results in a stable, in particular essentially form-fitting connection between the contact plate 32 and the housing cup 12 of the battery cell 10 .
  • Figure 8 shows the cell module 100 after the contact plate 32 has been pressed with the device 50 removed.
  • the battery cells 10 connected to one another via the contact plate 32 have now been removed from the second device part 52 and thus represent an independent, mechanically stable cell module 100.
  • FIG. 9 shows an enlarged longitudinal section through a battery cell 10 after the contact plate has been pressed, showing the essentially form-fitting connection between the contact plate 32 and the housing cup 12 of the battery cell 10.
  • the material 34 of the contact plate 32 fills the groove 22 completely.
  • the device 50 for making electrical contact with at least one battery cell 10 using the method described is not shown separately as a unit and comprises at least the first device part 52 on which positioning elements 56 , which are in particular vertical, are arranged and open into alignment pins 58 .
  • a plurality of battery cells 10 can be arranged in the first device part 52 between the positioning elements 56 for contacting purposes.
  • the dowel pins 58 can be guided through corresponding second openings 38 in a connecting element 30, in particular a contact plate 32, until the contact plate 32 rests on a bearing surface 59 of the positioning elements 56.
  • the device 50 further comprises a second device part 60 on which stamping elements 62 are arranged.
  • FIG. 10 shows a cell module 100 according to a further exemplary embodiment of the invention with two cell assemblies in a first device part 52 of device 50 for electrically contacting battery cells 10 .
  • FIG. 11 shows a longitudinal section through the cell module 100;
  • FIG. 12 shows the cell module 100 with the second device part 60 fed in from above.
  • the contact plate 32 has a first plate area 40 with the first openings 36 for the housing or housing cup 12 of battery cells 10 and a second plate area 42 which, in particular, has an axial height offset 44 relative to the first plate area 40 .
  • This second plate area 42 has contacting surfaces 46 . If the contact plate 32 is designed as copper sheet, for example, the height offset 44 can be achieved by simply bending the copper sheet.
  • the first plate region 40 is electrically connected to a first number of battery cells 10 by deforming the material 34 of the contact plate 32 around the first openings 36 in the respective grooves 22 of battery cells 10 .
  • the second plate region 42 is electrically connected, in particular cohesively connected, by contacting second poles 18 of a second number of battery cells 10 via the contacting surfaces 46.
  • a first cell assembly can be conveniently produced by connecting the contact plate 32 to the housing cups 12 of the battery cells 10 and a second cell assembly can be produced by connecting the contact plate 32 to the contacting surfaces of the second pole 18 of the battery cells 10 .
  • the battery cells 10 of the first cell assembly are connected electrically in parallel to the contact plate 32 via the housing cups 12, which are usually designed as a negative pole, while the battery cells 10 of the second cell assembly are connected via the contact surfaces of the second pole 18, which are usually designed as a positive pole is electrically connected to the contact plate 32 in parallel.
  • the first and the second cell assembly are electrically connected in parallel and in series with one another via the metallic and therefore electrically conductive connecting element 30 . In this way, a cell module 100 can be formed from the two cell assemblies in a favorable manner.
  • the voltage for the individual cell assembly with nine battery cells 10 connected in parallel would be about 3.0 V to 4.3 V and the voltage for the two series-connected cell assemblies of the whole Cell module 100 result in a voltage of about 6.0 V to 8.6 V.
  • FIG. 13 shows an isometric representation of a cell module 100 according to a further exemplary embodiment of the invention with two cell assemblies in a first device part 52 of the device 50, cast with a casting compound 64 in a module housing 72.
  • Figure 14 shows a longitudinal section through the cast cell module 100.
  • positioning elements 56 in particular positioning elements 56 standing parallel to the longitudinal axis 15 of the cells 10, are arranged on a base plate 102, which also serves as the first device part 52.
  • the battery cells 10 are arranged between the positioning elements 56 .
  • the dowel pins 58 are guided through corresponding second openings 38 in the contact plate 32 so that the contact plate 32 rests on the positioning elements 56 .
  • the battery cells 10 are cast with a casting compound 64 , in particular in a mold designed as a blister film, and are then contacted by means of the contact plate 32 .
  • the contact can be designed as described in the embodiment shown in Figures 10 to 12.
  • the first device part 52 designed as a base plate 102 can remain as an integral part of the construction on the encapsulated battery cells 10 and can be connected to a cooling device 70, in particular a cooling plate 71, for example.
  • the base plate 102 can be glued or cast to the cooling plate 71 .
  • the positioning elements 56 can be thermally conductive and can be thermally conductively connected to the housing cups 12 of the battery cells 10 and to the cooling device 70 .
  • the potting compound 64 can be thermally conductive in order to achieve the most effective possible cooling of the battery cells 10 .
  • the encapsulated and contacted battery cells 10 can be arranged in a module housing 72 .
  • the cooling plate 71 can be designed, for example, as part of the module housing 72, for example as a base plate.
  • the cell module 100 is arranged in a module housing 72 and is cast with a casting compound 64 up to a casting height 66 below the contact plate 32 .
  • the arrangement of the encapsulated and contacted cell module 100 in the module housing 72 can be seen in the longitudinal section in FIG.
  • the cooling plate 71 is designed as part of the module housing 72 .
  • the cell module 100 is connected to the module housing 72 and the cooling plate 71 on a base plate 74, for example a battery housing, in which the cell module 100 is arranged.
  • FIG. 15 shows a schematic longitudinal section through a battery cell 10 with a connecting element 30 designed as a wire element 80 according to a further exemplary embodiment of the invention.
  • FIG. 16 and FIG. 17 isometric views of the battery cell 10 with the connecting element 30 embodied as a wire element 80 are shown.
  • the metallic wire element 80 has an annular region, the annular opening 82 of which is arranged around the groove 22 of the respective battery cell 10 and is pressed into the groove 22, for example.
  • At least part of the wire element 80 is guided away from the housing cup 12 as a first contacting element 84, in particular parallel to the longitudinal axis 15 of the battery cell 10.
  • the housing cup 12 can be electrically connected to a contacting circuit board via this first contacting element 84 (in the exemplary embodiment shown, both wire ends are each routed away as contacting elements 84).
  • FIG. 18 shows an enlarged longitudinal section through a battery cell 10 with a connecting element 30 designed as a wire element 80 before the wire element 80 is pressed and in FIG. 19 after the wire element 80 has been pressed.
  • a connecting element 30 designed as a metallic wire element 80, which is arranged around the groove 22 and, for example, pressed into the groove 22.
  • the wire element 80 has a first contacting element 84 which can be electrically connected to a contact plate 32 extending transversely to the longitudinal axis 15 .
  • FIG. 19 clearly shows how the material 34 of the wire element 80 has flowed into the groove 22 of the housing cup 12 and thus represents a non-positive and/or positive, in particular positive connection with the housing cup 12.
  • the wire element 80 can be pressed, for example, via a sleeve that is placed all around the housing cup 12 with the wire element 80 .
  • FIG. 20 shows a schematic longitudinal section through three battery cells 10 electrically connected to a contacting circuit board 88 according to a further exemplary embodiment of the invention.
  • contact is first made with the individual battery cell 10 using the first contacting element 84 . Thereafter, the contacting element 84 can then be connected to a contact plate 32, in particular a contacting board 88.
  • This contact circuit board 88 can be designed as a conventional circuit board, for example. However, the contacting circuit board 88 can in particular have a stamped grid, in particular with integrated busbars, for suitable interconnection of the contacted battery cells 10 .
  • a second pole 18 of the battery cell 10 with a second electrical potential can be contacted with a second contacting element 86, which is electrically connected to the contacting circuit board 88, in particular is connected with a material bond.
  • the second pole 18 of the battery cell 10 can also be connected directly to the contacting circuit board 88 .
  • An advantage of this exemplary embodiment is that the interconnection of the battery cells 10 with one another is defined by the contacting circuit board 88 and can also be changed again afterwards by exchanging the contacting circuit board. In this way, increased flexibility in the interconnection of the battery cells 10 can be achieved.
  • the battery cells 10 can be arranged on a base plate 102 which has positioning elements 56 , in particular positioning elements 56 which are parallel to the longitudinal axis 15 of the cells 10 .
  • the battery cells 10 can be arranged between the positioning elements 56 and can be contacted with the contact plate 32 using first contacting elements 84 .
  • the battery cells 10 can also be cast into a cell module in this exemplary embodiment in order to achieve corresponding mechanical stability of the cell module and/or to make the cooling of the battery cells 10 more effective.
  • FIG. 21 shows a schematic longitudinal section through a battery 200 with two cell modules 100 arranged in a battery housing 202 according to a further exemplary embodiment of the invention.
  • the cell modules 100 each having a plurality of battery cells 10 which are in contact with one another in the manner described are electrically interconnected and electrically connected to an electrical contacting element 204 .
  • the cell modules 100 can be connected in parallel or in series.
  • the contacting element 204 is indicated purely schematically and can include conventional high-voltage plugs and signal plugs for controlling the battery 200 . Reference sign

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

L'invention concerne un procédé de mise en contact électrique d'au moins un élément de batterie (10) avec un élément de liaison métallique (30) qui comporte un boîtier avec une coupelle de logement métallique (12) ayant un axe longitudinal (15), une surface latérale extérieure (20) de la coupelle de logement (12) présentant une rainure (22) s'étendant au moins par endroits autour de l'axe longitudinal (15), comprenant la fourniture de l'élément de liaison (30) avec au moins une première ouverture (36, 82) qui est adaptée à une section transversale et/ou à un diamètre de la coupelle de logement (12), en particulier au niveau de la rainure (22) ; la mise en contact de la rainure (22) et une première ouverture (36, 82) ; et - la fixation de la coupelle de logement (12), en particulier au niveau de la rainure (22), dans la première ouverture (36, 82) de l'élément de liaison (30) sensiblement avec un ajustement de forme. L'invention concerne également un dispositif (50) pour la mise en contact électrique d'au moins un élément de batterie (10).
PCT/EP2022/072254 2021-08-25 2022-08-08 Procédé et dispositif de mise en contact électrique d'élément de batterie, module d'élément et batterie WO2023025580A1 (fr)

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DE102021122034.3 2021-08-25
DE102021122034.3A DE102021122034A1 (de) 2021-08-25 2021-08-25 Verfahren und vorrichtung zum elektrischen kontaktieren einer batteriezelle, zellmodul und batterie

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WO2023025580A1 true WO2023025580A1 (fr) 2023-03-02

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008034699A1 (de) * 2008-07-26 2010-01-28 Daimler Ag Batterie mit mehreren Batteriezellen
WO2020240463A1 (fr) * 2019-05-28 2020-12-03 Grenland Energy As Module de batterie
WO2021020413A1 (fr) * 2019-07-31 2021-02-04 パナソニックＩｐマネジメント株式会社 Batterie

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110313081B (zh) 2017-02-23 2023-05-09 松下知识产权经营株式会社 电池模块
KR20210103090A (ko) 2020-02-13 2021-08-23 주식회사 엘지에너지솔루션 레일형 소켓이 구비된 전지 모듈 및 이를 포함하는 전지 팩

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008034699A1 (de) * 2008-07-26 2010-01-28 Daimler Ag Batterie mit mehreren Batteriezellen
WO2020240463A1 (fr) * 2019-05-28 2020-12-03 Grenland Energy As Module de batterie
WO2021020413A1 (fr) * 2019-07-31 2021-02-04 パナソニックＩｐマネジメント株式会社 Batterie

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