CN118251792A - Energy store, method for producing an energy store and vehicle - Google Patents

Energy store, method for producing an energy store and vehicle Download PDF

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Publication number
CN118251792A
CN118251792A CN202280076223.9A CN202280076223A CN118251792A CN 118251792 A CN118251792 A CN 118251792A CN 202280076223 A CN202280076223 A CN 202280076223A CN 118251792 A CN118251792 A CN 118251792A
Authority
CN
China
Prior art keywords
electrical connection
connection element
circuit board
advantageously
energy store
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
CN202280076223.9A
Other languages
Chinese (zh)
Inventor
B·布雷梅克
S·罗森克朗兹
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.)
Hella GmbH and Co KGaA
Original Assignee
Hella GmbH and Co KGaA
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 Hella GmbH and Co KGaA filed Critical Hella GmbH and Co KGaA
Publication of CN118251792A publication Critical patent/CN118251792A/en
Pending legal-status Critical Current

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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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • 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
    • H01M50/284—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with incorporated circuit boards, e.g. printed circuit boards [PCB]
    • 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
    • H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
    • 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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • 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
    • H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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

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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)
  • Microelectronics & Electronic Packaging (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention relates generally to an energy store (1), a method for producing such an energy store (1) and a vehicle (100) having such an energy store (1). The energy store (1) comprises at least one battery cell (7) and a circuit board (5), the circuit board (5) advantageously being provided as part of a battery management system and/or for electrically connecting the at least one battery cell (7) with an external connection of the energy store (1). The circuit board (5) comprises at least one first electrical connection element (3 a), advantageously configured as a copper track or a copper plate. Each cell comprises a second electrical connection element (3 b), typically constructed as an aluminum plate or rail. For connecting the two electrical connection elements (3 a, 3 b), a welding method, in particular a laser welding method, is used. Advantageously, a temperature sensor (9) is in direct thermal contact with the first electrical connection element (3 a), such that the temperature sensor (9) is able to determine the temperature of the battery cell (7).

Description

Energy store, method for producing an energy store and vehicle
Technical Field
The invention relates to an energy store and to a method for producing such an energy store. Furthermore, the invention relates to a vehicle.
Background
The energy store nowadays comprises a plurality of battery cells and a circuit board (circuit board with electrical/electronic components). Typically, the battery cells are interconnected by threaded connections with each other and with the electrical connection elements of the circuit board.
Disadvantageously, such threaded connections involve a large number of working steps.
In individual cases, therefore, a material-locking connection, such as soldering, is also disclosed for connecting electrical connection elements in the accumulator field.
The material-locking connection is disadvantageous, in particular, in the case of electrical connection elements made of aluminum, since soldering or welding for connecting aluminum is often brittle. This means that the mass of such an accumulator is poor.
Welding methods, in particular laser welding methods, have recently been used to connect the connection elements of the battery cells to one another, as disclosed in DE 10 2019 127 703 A1. Similar techniques exist for connecting battery cells to each other, for example US2019/0296313 A1.
However, the prior art does not suggest a quick and suitable electrical connection of a circuit board to a battery cell, which may be implemented quickly and simply. Such an advantageous method would lead to an optimized accumulator.
Disclosure of Invention
The object of the present invention is therefore to provide an improved energy store that can be produced in a simple manner.
The object of the invention is, in particular, to ensure the energy supply of a vehicle in a simple manner with such an improved energy store.
This object is achieved with an energy store according to claim 1. Furthermore, this object is achieved by a method for producing an energy store according to claim 9. Finally, this object is achieved by using the energy store described herein in a vehicle according to claim 11.
Advantageous refinements of the invention are the subject matter of the dependent claims.
The energy store is designed in particular as a battery for a vehicle. The battery accumulator has one or more battery cells and a circuit board, wherein the circuit board has a first electrical connection element or the circuit board is fixedly connected to the first electrical connection element, wherein at least one of the battery cells has a second electrical connection element, wherein the first electrical connection element and the second electrical connection element are designed and arranged such that the electrical connection elements form an electrical connection in an unconnected state in a region, in particular by contact, in a force-locking manner, wherein the electrical connection is formed in a locally material-locking manner by a welding method, in particular by a laser welding method.
Preferably, the first electrical connection element and the second electrical connection element are composed of different metals. It is further advantageous if the first electrical connection element is connected to the circuit board by means of a soldered connection. Furthermore, the first electrical connection element can be fixed by means of a clamping connection.
The invention is particularly advantageously applicable to first and second electrical connection elements where "conventional" soldering is difficult to implement. Advantageously, the welding of the first and second electrical connection elements takes place at the points of mutual contact or at the areas of mutual contact, for example at the respective lateral ends of the respective electrical connection elements.
Advantageously, the second electrical connection element is configured as a contact element of a battery cell.
The respective first or second electrical connection element can advantageously be connected for said connection to a current sensor, for example a shunt resistor.
Advantageously, the first and/or the second electrical connection element is configured as a metal plate.
Advantageously, the battery cells are configured as pouch-type battery cells. Pouch-type battery cells typically include electrical connection members constructed of aluminum in a metal sheet shape, and thus the present invention is particularly suitable for connecting the pouch-type battery cells with the electrical connection members of a circuit board. Advantageously, the individual cells can also be configured as cylindrical or prismatic cells. The cylindrical battery cells advantageously form a stable arrangement in the holder.
Preferably, the accumulator comprises a plurality of battery cells arranged in a stack. By the stacked arrangement, the respective second electrical connectors of the battery cells are configured in parallel.
The circuit board is preferably configured as a Printed Circuit Board (PCB). A Battery Management System (BMS) and a further control device for the energy store are preferably mounted on the circuit board. In addition, sensors, such as shunt resistors or also temperature sensors, can be mounted and/or fastened to the circuit board.
The force-locking connection of the two electrical connectors is advantageously formed by the respective electrical connection elements being shaped such that, after the mechanical engagement of the energy store, in each case one region of the connection elements is "pressed" against one another in this region or at least in this region is in contact with one another. Such engagement is also referred to as pre-installation. The electrical connection elements can be joined together in this region by means of fusion welding. The force-locking connection of the electrical connection elements is advantageously produced by the elastic material stress of the respective electrical connection element.
Preferably, the at least one electrical connection element is partially elastically configured. Advantageously, the elastic portion or the elastic region is configured such that it is at least partially formed from sheet metal by the respective connecting element.
Advantageously, the material-locking connection of the electrical connection element can be combined with a snap-lock connection.
Advantageously, at least the first electrical connection element may be in thermal contact with the cooling body or have a cooling body. The heat can be released better from the battery cells into the environment, for example, by means of a cooling body.
It is also advantageous if the respective electrical connection element has a slit or a recess. Preferably, the respective electrical connection elements which are connected to one another in a locally bonded manner comprise slots or recesses at the same location. The electrical connection elements form a common edge in this region by virtue of the at least substantially uniform profile of the respective electrical connection elements. Preferably, the electrical connection element is soldered at the edge. The edges of the respective electrical connection elements are advantageously configured with a greater length by means of slits and/or gaps in the respective connection elements. Thus, a better material-locking connection can be obtained by longer weld seams at the respective edges.
Advantageously, the electrical connection elements are embodied such that they are embodied at least in the region of overlap such that the edges of the electrical connection elements overlap locally.
The electrical connection elements disclosed herein are also referred to as pole terminals. The respective connecting element is advantageously configured with tongue-shaped sections, wherein at least the respective tips of the tongues are advantageously welded to one another.
Advantageously, the material-locking electrical connection of the two electrical connectors is carried out by means of laser welding in the respective region, at which the electrical connection elements are assembled together substantially in a form-locking manner by the arrangement.
Laser welding is a particularly advantageous method by which a well-conducting electrical connection of the electrical connection elements can be constructed, in particular for the case where the respective electrical connection elements consist of different materials (e.g. copper, iron and/or aluminum). Alternatively, the respective electrical connection element may also consist at least substantially of zinc or lead. Advantageously, so-called base alloys of copper, aluminum or iron can also be used as material for the corresponding electrical connection element.
Preferably, the individual electrical connection elements are configured congruently at least in this region. The electrical connectors are preferably partially closed to one another and overlap in this region preferably in a form-fitting manner. The electrical connection elements are preferably soldered together in the region in which they are congruently formed or are in contact with one another in the as yet unsoldered state.
Although batteries for vehicles are particularly well suited as energy storage devices, each other type of battery/accumulator can also be produced more simply and at lower cost by means of the invention. For example only, the energy store may also be embodied as a battery for a solar power plant or as a fuel cell energy store or as an energy store for a wind power plant.
Advantageously, a quick and simple production of the energy store can be achieved by a positive connection of the two electrical connection elements. Advantageously, the form-locking connection is achieved without auxiliary means for positioning and/or for fixing the electrical connection element. The electrical connection element is advantageously configured here as an engagement counterpart. Thereby, a complex screw connection for electrically connecting the circuit board and the at least one battery cell can be dispensed with.
In a further advantageous embodiment of the invention, the first electrical connector is composed of copper or a copper-containing alloy, in particular a copper-based alloy, and/or the second electrical connector is composed of aluminum or an aluminum-containing alloy, in particular an aluminum-based alloy.
Advantageously, the first electrical connector may also be at least substantially composed of an iron-containing material (e.g., stainless steel or an iron-based alloy). Advantageously, the iron-containing material has a relatively high strength. Furthermore, the iron-containing material is easy to process, in particular by forming methods such as pressing or forging.
Advantageously, the second electrical connection element may also comprise at least partially an iron-containing material, such as (stainless) steel.
Advantageously, the first electrical connection element may be selected from iron or an iron-based alloy, as long as the respective second electrical connection element is made at least to a large extent of copper or a copper-based alloy.
Advantageously, the second electrical connection element assigned to the battery cell is composed of aluminum. This is often the case in particular in lithium ion battery cells. Aluminum has the advantages of light weight, easy processing and high conductivity.
Advantageously, the first electrical connection element is fixed to the circuit board by means of a soldered connection. The electrical connection to the conductor circuits on the circuit board is advantageously achieved by means of a soldered connection. A particularly simple and stable electrical and mechanical connection of the circuit board to the first electrical connector can be produced by means of the soldered connection. Alternatively or additionally, the first electrical connection element can be mechanically and/or electrically firmly connected to the circuit board by means of a pressing-in method.
The respective second electrical connection element of the individual cells is usually composed of aluminum or an aluminum-containing alloy, in particular an aluminum-based alloy. The already existing electrical connection elements of the battery cells can thus advantageously be used directly for connection with the (first) electrical connection elements of the circuit board.
Advantageously, the individual cells are configured as lithium-ion cells. Alternatively or additionally, lead cells may be used as the cells. In particular, sodium ion-based or graphene-based battery cells may be used.
In particular, by means of a laser welding method, the different materials of the electrical connection element (e.g. aluminum, iron or aluminum, in particular their respective base alloys) can be easily and reliably bonded to each other.
In a further advantageous embodiment of the invention, the first electrical connection element and the second electrical connection element are connected in a material-locking manner by means of a laser welding method.
It is particularly advantageous if the connection is made at the edges of the electrical connection elements which are arranged one above the other. In order to increase the strength of the material-locking connection, a recess, such as a hole, can be introduced in the overlapping region of the respective electrical connection elements, wherein the electrical connection elements are welded to one another on the respective inner sides of the recess.
By using a laser welding method, the establishment of an electrical connection of the electrical connection elements can be monitored particularly well, for example by means of an optical monitor. Furthermore, so-called welding spatter can be effectively prevented. It is particularly advantageous to effectively prevent damage to the battery cells respectively connected to the circuit board. Finally, when aluminum and copper are used as the material of the electrical connection element, brittle regions are largely avoided.
In a further advantageous embodiment of the invention, the first electrical connection element is in direct thermal contact with the temperature sensor.
The temperature sensor is preferably designed to determine the temperature of a battery cell, which is directly fixed to the circuit board by an electrical connection element. Advantageously, the temperature sensor is directly fixed to the circuit board by means of a soldered connection. Advantageously, a direct thermal connection between the first electrical connection elements is achieved by means of a thermally conductive paste and/or a clamping connection of the temperature sensor to the first electrical connection elements. In this case, it is not necessary to electrically connect the temperature sensor based on a cable. This is particularly helpful in improving the manufacture of the accumulator.
Preferably, the temperature sensor is configured as a temperature-dependent resistor, in particular as a PTC or NTC. Advantageously, the temperature sensor is directly fixed to the circuit board. Advantageously, the temperature sensor is in direct thermal contact with the first electrical connector. In order to improve the thermal connection, a thermally conductive paste is advantageously used between the temperature sensor and the first electrical connection element.
Alternatively, the temperature sensor is fixed on the first electrical connection element.
The soldered connection of the two electrical connection elements to each other ensures a good thermal connection of the individual electrical connection elements and thus of the individual battery cells to the circuit board. In this way, the temperature of the battery cells can be measured by a temperature sensor fixed to the circuit board. This saves further temperature sensors on the at least one battery cell.
In a further advantageous embodiment of the invention, the temperature sensor is arranged on a circuit board.
Preferably, the temperature sensor is directly fixed to the circuit board, for example by means of a soldered connection or a press-in connection. Advantageously, the temperature sensor is at least in direct abutment or in direct contact with the first electrical connection element. As long as the first electrical connection element is connected to the circuit board by means of a Press-Fit connection (Press-Fit), a mechanical (Press-Fit) connection of the temperature sensor to the first electrical connection element is also preferably achieved.
Advantageously, the temperature sensor is positioned in an opening or void of the first electrical connector.
By fixing the temperature sensor directly to the circuit board, in particular by means of soldered contacts, the use of stranded wires or the like for connecting the temperature sensor is avoided. The embodiment described above therefore also contributes to a simple and cost-effective provision of the energy store.
In a further advantageous embodiment of the invention, the first and/or the second electrical connection element each have at least one convergence region, wherein the material-locking connection is positioned in the region of the respective convergence (zusammenlaufenden).
The narrowed region may be constituted by edges of the respective electrical connection elements that are narrowed towards each other or edges that are narrowed towards each other. Such a region is preferably tongue-shaped. The tongue-shaped region is in particular a trapezoid region with rounded upper parts.
Each converging region may be implemented on the side of the corresponding region by a substantially triangular void. Advantageously, the corners or edges created by the gaps are rounded.
Advantageously, each electrical connection element has a plurality of such convergence zones on at least one end of the electrical connection element or on one side of the electrical connection element.
Advantageously, the corners and/or edges of the individual electrical connection elements are rounded off, so that potential spikes that may occur are avoided.
The respective region is particularly advantageously configured as a triangle or trapezoid, wherein the edge of the individual electrical connection element is present in the form of a radius.
In a further advantageous embodiment of the invention, the energy store has at least two battery cells, wherein each battery cell has two second electrical connection elements, wherein the second connection elements of the battery cells are connected to one another by means of a laser welding method.
By means of this soldering method, the second electrical connection elements form a material-locking connection with each other. The thermal connection of the battery cells to one another and in particular to the temperature sensor is advantageously achieved by a material-locking connection.
Advantageously, the accumulator comprises a plurality of cells electrically connected in series. The electrical connection of the battery cells is achieved by the electrical connection of the respective second connection elements to each other.
In a particularly advantageous manner, the individual second electrical connection elements are composed of aluminum or an aluminum-based alloy, so that the electrical connection elements form a stable and form-locking connection with one another by means of a welding process.
Advantageously, the battery cells are configured as so-called pouch-type battery cells. Alternatively, the battery cells are configured as cylindrical or prismatic battery cells, which may have connecting tabs configured as second electrical connection elements. Advantageously, the second connecting element is made at least substantially of copper or a copper-based alloy.
With the invention disclosed herein, the tabs of each cell may be directly soldered to the corresponding first electrical connection element. The invention can thus be used to produce energy accumulators in a particularly simple and cost-effective manner.
In a further advantageous embodiment of the invention, the second electrical connection element has a convergence region, wherein the second electrical connection element is connected in a material-and/or form-locking manner in the convergence region.
The connection of the individual second electrical connection elements is preferably achieved by a soldering method, in particular a laser soldering method.
The method for manufacturing an energy storage according to the above description comprises at least the following steps:
Positioning the battery cell and the circuit board such that the respective electrical connection element and the second electrical connection element form a force-locking connection in one region,
-Connecting the first electrical connection element and the second electrical connection element in a material-locking manner in the region, in particular by means of a welding process, in particular by means of a laser welding process.
Optionally, the method further comprises fixing the first electrical connection element to the circuit board, preferably by means of a soldered connection. Advantageously, the first electrical connection element can also be fixed to the circuit board by a (press) press-fit connection.
Optionally, the electrical connection elements are connected in the region by means of a soldering method.
Alternatively, the connection to the electrical connection element is effected in a region which is formed as a narrowing, in particular as a trapezoid or tongue. Advantageously, the connection is effected on respective edges of the electrical connection elements arranged adjacent to each other.
Advantageously, the material-locking connection can be improved by forming the connection of the respective electrical connection element within this region by means of laser welding.
By means of the above-described method, a particularly simple, fast and durable connection of the circuit board to the at least one battery cell can be provided. The production of the energy store can thereby be improved.
In an advantageous embodiment of the invention, the temperature sensor is fastened to the circuit board or to the first electrical connection element in such a way that a thermal connection is produced between the temperature sensor and the first electrical connection element.
Advantageously, the temperature sensor is fixed to the circuit board after the first connecting element is fixed to the circuit board. Optionally, the thermal connection of the temperature sensor to the first electrical connection element is then advantageously improved by means of a press-fit connection and/or a thermally conductive paste.
Alternatively, the fixing of the temperature sensor to the circuit board may be performed in a first step and the first electrical connection element to the circuit board in a second step. Advantageously, the temperature sensor is directly thermally connected to the first electrical connection element when the first electrical connection element is fixed.
Advantageously, the temperature sensor may be positioned in a void of the circuit board and/or a void of the first electrical connection element. Advantageously, a direct thermal connection is achieved by means of a press-fit connection and/or a thermally conductive paste.
The vehicle comprises at least one accumulator as described above. The vehicle may be configured as a motor vehicle, an electrically driven road vehicle, preferably as a motor vehicle or a rail vehicle.
Alternatively, the energy store described here can also be provided in the wind area or for intermediate storage of solar energy. Alternatively, the accumulator may also be used with a fuel cell.
In summary, the invention relates to an energy store, a method for producing such an energy store and a vehicle having such an energy store. The energy store comprises at least one battery cell and a circuit board, wherein the circuit board is advantageously provided as part of a battery management system and/or is used for electrically connecting the at least one battery cell with an external connection of the energy store. The circuit board comprises at least one first electrical connection element, advantageously configured as a copper track or a copper plate. Each cell comprises at least one second connecting element, typically constructed as an aluminum plate or an aluminum rail. For connecting the two electrical connection elements, a soldering method, in particular a laser soldering method, is used. Advantageously, the temperature sensor is in direct thermal contact with the first electrical connection element. Advantageously, the temperature sensor may determine the temperature of the at least one battery cell.
The invention is described in detail below with the aid of the figures. The embodiments shown in the drawings and described below are merely exemplary and in no way limit the scope of applicability of the invention.
Drawings
In the drawings:
fig. 1 shows a battery cell and a circuit board, which are connected by an electrical connection element;
FIG. 2 illustrates a portion of an exemplary electrical connection element;
FIG. 3 illustrates an exemplary accumulator in a vehicle; and
Fig. 4 shows an exemplary method flow diagram.
Detailed Description
Fig. 1 shows a battery cell 7 and a circuit board 5, which are connected by means of electrical connection elements 3a, 3 b. The battery cell 7 and the circuit board 5 are part of the accumulator 1 (not shown separately).
The first electrical connection element 3a is electrically connected to the circuit board 5. The electrical connection of the circuit board 5 to the first electrical connection element 3a (as shown here by way of example) is constructed by means of a soldered connection 10. Advantageously, the circuit board 5 and the first electrical connection element 3a may also be connected to each other by a press-in method. Advantageously, the first electrical connection element 3a is constituted by copper or a copper-based alloy. Alternatively, the first electrical connection element 3a may be composed of an iron-containing material, for example, of stainless steel. The first electrical connection element 3a is shown overlapping the second electrical connection element 3b in the region 11. The first electrical connection element 3a and the second electrical connection element 3b are advantageously arranged congruently or at least substantially overlapping in the region 11. In the region 11, the electrical connectors are connected to one another in a material-locking manner by means of a welding method, in particular a laser welding method. Advantageously, the material-locking connection is achieved by (laser) welding on the respective edges of the electrical connection elements 3a, 3 b.
The second electrical connection element 3b is connected to the battery cell 7. In particular in so-called pouch cells, the second electrical connection element is formed as an aluminum plate. A good conductive and durable connection of similar metals, such as aluminum, iron and copper (and their base alloys), can be achieved by welding methods, in particular laser welding methods.
Advantageously, the electrical connection elements 3a, 3b or the circuit board 5 and the battery cells 7 are positioned and oriented such that the electrical connection elements 3a, 3b overlap one another, so that the respective overlapping edges of the electrical connection elements 3a, 3b are sufficient to achieve stable fixation and a sufficiently electrically and/or thermally conductive connection. This possibility is exemplarily described in fig. 2 below.
The temperature sensor 9 is positioned on one side of the circuit board 5. The temperature sensor 9 is advantageously fastened to the circuit board 5. The temperature sensor 9 is advantageously in direct thermal contact with the first electrical connection element 3a. Advantageously, the temperature sensor 9 contacts the first electrical connection element 3a. By means of the material-locking connection of the first and second electrical connection elements 3a, 3b, an at least indirect thermal contact between the battery cell 7 and the temperature sensor 9 is formed.
Alternatively, the temperature sensor 9 may also be arranged directly on the first electrical connection element 3 a. Alternatively, the temperature sensor 9 may be positioned in a void or opening of the first electrical connection element 3a and/or the circuit board 5. In the above-described embodiment, the temperature sensor 9 can be connected particularly simply to the circuit board 5, in particular to the electronics on the battery management system. The temperature of the battery cells 7 can thus be determined by means of the temperature sensor 9. Thus, at least the complex wiring of the temperature sensor 9 on the battery cells 7 can be saved.
Fig. 2 shows an exemplary part of the electrical connection elements 3a, 3 b. The electrical connection elements 3a, 3b comprise a plurality of recesses 14, wherein each two adjacent recesses 14 form a mutually narrowed section, in particular a (rounded) trapezoidal or tongue-shaped section 13. Preferably, the material-locking connection of the electrical connection element is realized in the region 11 of the tongue 13. Alternatively or additionally, the respective electrical connection element 3a, 3b comprises an opening 15, wherein the respective opening 15 is advantageously positioned in a section or region 11 of the tongue 13. The openings 15 serve to enlarge the edges of the respective electrical connection elements 3a, 3 b. The material-locking connection of the electrical connection elements 3a, 3b in the openings 15 may be advantageous. (thus, the openings are indicated by dashed lines). Advantageously, the material-locking connection of the electrical connection elements 3a, 3b to each other is realized on the edges by means of a welding process. The longer edges of the respective electrical connectors thus contribute to a more secure soldered connection of the electrical connection elements 3a, 3b to each other. The soldered connection 17 is arranged on the edge of the respective electrical connection element 3a, 3b, as shown on the right side of the drawing.
Fig. 3 shows a vehicle 100 with an energy store 1. The energy store is advantageously configured as a traction battery or a starter battery of the vehicle 100. Although the vehicle 100 is illustrated here as an automobile, the vehicle 100 may also be configured as a rail vehicle.
Fig. 4 shows an exemplary method flow diagram. The method flow chart comprises at least a first step v1, a second step v2 and a third step v3.
In a first step v1, the circuit board (5) is mechanically connected to the respective battery cell 7 such that the electrical connection elements 3a, 3b are at least partially in contact. Advantageously, in the region 11 of the respectively overlapping electrical connection elements 3a, 3b, a force-locking connection of the respectively mutually oriented electrical connection elements 3a, 3b is also formed.
In an optional second step v2, the connection of the respectively adjacent second electrical connection elements 3b is achieved by means of a (laser) welding method. Advantageously, the respectively contacted second electrical connection elements 3b of the respectively adjacent battery cells 7 form a force-locking connection, so that a material-locking (electrical) connection of the second electrical connection elements 3b can be realized simply and reliably by means of a (laser) welding method. Depending on the different design of the energy store 1, this second step v2 can also be carried out before the first step v 1.
In a third step v3, an electrical connection of the respective first electrical connection element 3a to the respective second electrical connection element 3b is performed. The electrical connection of the first electrical connection element 3a to the second electrical connection element 3b is advantageously achieved by means of a laser welding method.
Advantageously, the temperature sensor 9 is positioned in a further step such that the temperature sensor 9 establishes a direct thermal connection with the first electrical connection element 3 a.
In summary, the invention relates to an energy store 1, a method for producing such an energy store 1 and a vehicle 100 having such an energy store 1. The energy store 1 comprises at least one battery cell 7 and a circuit board 5, wherein the circuit board 5 is advantageously provided as part of a battery management system and/or for electrically connecting the at least one battery cell with an external connection of the energy store. The circuit board comprises at least one first electrical connection element 3a, advantageously configured as a copper track or a copper plate. Each cell 7 comprises a second connecting element 3b, typically constructed as an aluminum plate or an aluminum rail. For the material-locking connection of the two electrical connection elements 3a, 3b, a welding method, in particular a laser welding method, is used. Advantageously, the temperature sensor 9 is in direct thermal contact with the first electrical connection element 3a.
List of reference numerals
1 Accumulator
100 Vehicle
3A first electrical connection element
3B second electrical connection element
5 Circuit board
7 Battery cell
9 Temperature sensor
10 Braze joint
Region 11
13 Tongue-shaped portion
14 Gaps
15 Holes
17 Welded connection

Claims (11)

1. An energy store (1), in particular a battery for a vehicle, comprising one or more battery cells (7) and a circuit board (5), wherein the circuit board (5) has a first electrical connection element (3 a) or is fixedly connected to the first electrical connection element (3 a), wherein at least one of the battery cells (7) has a second electrical connection element (3 b), wherein the first electrical connection element (3 a) and the second electrical connection element (3 b) are designed and arranged such that the electrical connection elements (3 a,3 b) form an electrical connection in an unconnected state in a region (11), in particular by contact, in a force-locking manner, and wherein the electrical connection is formed in a locally material-locking manner by a welding method, in particular by a laser welding method.
2. Accumulator (1) according to claim 1, wherein the first electrical connection element (3 a) is composed of copper or a copper-based alloy and/or the second electrical connection element (3 b) is composed of aluminum or an aluminum-based alloy.
3. The accumulator (1) according to any of the preceding claims, wherein the first electrical connection element (3 a) and the second electrical connection (3 b) are connected in a material-locking manner by means of a laser welding method.
4. Accumulator according to any one of the preceding claims, wherein the first electrical connection element (3 a) is in direct thermal contact with a temperature sensor (9).
5. Accumulator according to claim 4, wherein the temperature sensor (9) is arranged on the circuit board (5) and/or is fixed to the circuit board (5).
6. Accumulator (1) according to any one of the preceding claims, wherein the first and/or second connectors (3 a,3 b) each have at least one converging section, in particular a tongue-shaped region (13), wherein the material-locking connection of the electrical connection elements (3 a,3 b) is positioned in the respective converging section.
7. The energy store (1) according to any one of the preceding claims, having at least two battery cells (7), wherein each battery cell (7) has two electrical connection elements (3 b) in each case, wherein the respectively adjacent electrical connection elements (3 b) of each battery cell (7) are connected to one another by means of a laser welding method.
8. Accumulator according to claim 7, wherein each second electrical connection element (3 b) has a converging section and each second electrical connection element (3 b) is connected to each other by means of a welding method, in particular a laser welding method.
9. Method for manufacturing an accumulator (1) according to any one of the preceding claims, the method comprising at least the steps of:
Positioning the battery cell (7) and the circuit board (5) such that the respective electrical connection element (3 a) and the second electrical connection element (3 b) form a force-locking connection in one region (11),
-Connecting the first electrical connection element (3 a) to the second electrical connection element (3 b) in the region (11) by means of a welding process, in particular by means of a laser welding process, in a material-locking manner.
10. Method according to claim 9, wherein the temperature sensor (9) is fixed on the circuit board (5) such that the temperature sensor (9) is in direct thermal contact with the first electrical connection element (3 b).
11. A vehicle (100) having an accumulator (1) according to any one of claims 1 to 8.
CN202280076223.9A 2021-11-17 2022-11-14 Energy store, method for producing an energy store and vehicle Pending CN118251792A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102021129965.9 2021-11-17
DE102021129965.9A DE102021129965A1 (en) 2021-11-17 2021-11-17 Energy store, method for producing an energy store and vehicle
PCT/EP2022/081710 WO2023088818A1 (en) 2021-11-17 2022-11-14 Energy store, method for producing an energy store and vehicle

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WO (1) WO2023088818A1 (en)

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
KR101198869B1 (en) * 2008-10-14 2012-11-07 주식회사 엘지화학 Connecting Member of Electrode Terminals for Preparation of Core Pack
US8858270B2 (en) * 2011-01-25 2014-10-14 The Gillette Company Rechargeable battery pack including low-resistance battery-pack interconnect
DE102012205910A1 (en) * 2012-04-11 2013-10-17 Elringklinger Ag Cell contact system for electrochemical device used as accumulator, has signal line connector which comprises connection housing coupled to support element that carries power line system and signal line system
US10147979B2 (en) * 2013-12-17 2018-12-04 Husqvarna Ab Battery pack with cell fixing apparatus
CN108346767B (en) * 2017-01-22 2023-11-17 泰科电子(上海)有限公司 Connection assembly
JP7041842B2 (en) 2018-03-26 2022-03-25 トヨタ自動車株式会社 Assembled battery and manufacturing method of assembled battery
US20190363326A1 (en) 2018-05-22 2019-11-28 GM Global Technology Operations LLC Battery assembly with multi-piece bus bar cap assembly
US11018381B2 (en) 2019-02-26 2021-05-25 GM Global Technology Operations LLC Battery module with interconnect board assembly having integrated cell sense PCB-flex circuit hardware
DE102019127703A1 (en) 2019-11-04 2021-05-06 HELLA GmbH & Co. KGaA Cell composite, comprising a plurality of energy storage cells and a method for its production

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