WO2014048633A1

WO2014048633A1 - System comprising at least one bracket for a collector of an electrode assembly and method for the production of such a system

Info

Publication number: WO2014048633A1
Application number: PCT/EP2013/066806
Authority: WO
Inventors: Thomas Woehrle; Markus Kohlberger
Original assignee: Robert Bosch Gmbh; Samsung Sdi Co., Ltd.
Priority date: 2012-09-27
Filing date: 2013-08-12
Publication date: 2014-04-03
Also published as: CN104995766B; CN104995766A; DE102012217605A1

Abstract

The invention proposes a system comprising at least one bracket (10, 11) for a collector (70, 71) of an electrode assembly (80) and a method for producing such a system. The system is characterized in that the bracket (10, 11) comprises a hollow body (20) with at least one opening (25), which is suitable for accommodating an end region of the collector (70, 71) such that the end region (70, 71) is enclosed by the hollow body (20), wherein the one end region of the collector is an end region in respect of a main extension direction of the collector (70, 71). The enclosure provides a mechanical protection for the end region (70, 71), which has been identified by the inventors as being at particular risk of short circuiting under mechanical action.

Description

description

title

System comprising at least one holder for a collector of an electrode assembly and method for producing such a system

The present invention relates to a system comprising at least one holder for a collector of an electrode assembly and methods of making such a system. The electrode ensemble is preferably one

Electrode ensemble of a battery cell of a motor vehicle and the

Battery cell is preferably a lithium-ion battery cell.

State of the art

With improved storage capacity, more frequent rechargeability, and higher energy densities, batteries such as lithium ion cell based batteries or nickel metal hydride batteries are finding wider and wider applications.

Among other things, lithium-ion cell-based batteries are characterized by high energy densities and extremely low self-discharge.

Batteries with lower energy storage capacity are used, for example, for small portable electronic devices such as mobile phones, laptops, camcorders, and the like, while high capacity batteries are used as the power source for driving motors of hybrid or electric vehicles, etc., or as stationary batteries, for example Wind or solar energy systems

Find use.

Batteries can be connected, for example, by the serial connection of

Battery modules are formed, in some cases, parallel connections of the battery modules and the battery modules in turn made of serially and / or parallel-connected battery cells, each one

Electrode ensemble in a housing, may consist. Batteries, battery modules or battery cells may additionally include components for monitoring, controlling or regulating the battery behavior.

Electrode ensembles of battery cells, especially but not only of

Lithium-ion cells, often consist of a stack or a coil of electrically separated by one or more separators

Electrode layers.

In the patent application US 2008/0107961 a battery cell is described with a trained as a winding electrode ensemble, in the uncoated

Points are welded to the winding with so-called collectors, the collectors contact terminals of the battery cell. The ensemble of electrodes is supported by supporting elements of a housing, which are inserted laterally into the winding.

The European patent application EP 1 269 939 describes a galvanic element with Ableitfahnen, which are welded to collectors. A plastic film made of polyimide with the Abieiter and the collector by means of a

Glued silicone adhesive layer.

German patent application DE 10 2006 053 273 relates to a galvanic element which comprises at least one individual cell with electrodes arranged on a planar separator. At least one of the electrodes has a current collector, which is provided with a discharge lug, which overlaps with an edge region of the separator, wherein the separator in this

Edge area is turned over and / or in this edge region at least one thin layer is arranged to increase the short circuit safety of the galvanic element. Since it can come as a result of battery cell internal short circuits to exothermic processes with heat or gas formation, which in turn to

Outgassing, smoke or flame formation and so too significant

In the field of technology of the present invention, efforts are constantly being made to provide short-circuit security for security risks

To increase battery cells. Disclosure of the invention

According to the invention, a system according to claim 1 is presented. The system comprises at least one holder for a collector of an electrode ensemble, wherein the holder is electrically insulating.

The system is characterized in that the holder comprises a hollow body having at least one opening adapted to receive an end portion of the collector with respect to a main extension direction so that the end portion is covered by the hollow body, the end portion of the collector being an end portion with respect to a main extension direction of the collector.

The jacket provides a mechanical protection of the end portion, which has been identified by the inventors ais particularly vulnerable to short circuit formation under mechanical action.

In one embodiment, the holder may comprise a groove which is adapted to the other end region of the other with respect to the Hauptausdehnungsrichtung

Collector.

Then the other end area is protected against mechanical influences.

The holder may comprise in this embodiment a parallel to the main expansion direction plate which connects the hollow body with the groove.

Then the collector is also at least partially protected against mechanical effects in the remaining area.

The holder may be wholly or partly made of electrolyte-resistant plastic, for example polypropylene, polyethylene, polyolefin, polyester or

Polyimide, be. The holder may also be wholly or partly made of ceramic.

Plastic and / or ceramics can be an open or a closed one

Have pore structure and be prepared for example by foaming. All these materials are suitable for easy and inexpensive production. Porous material has the advantage of lower weight with the same protective effect. If the system further comprises cover plates which are suitable to be arranged parallel to the main extension direction and perpendicular to the plate between the groove and the hollow body, so as to continue the groove to the opening of the hollow body, another collector region can be with an electrode foil of the electrode ensemble connect and through the

Cover the cover plates to better mechanically protect the connected area of the collector.

The cover plates can be hinged to the plate, the gutter or the

Hollow body to be attached.

Then holder and cover plates can be easily manufactured as a unit, whereby manufacturing processes of a battery cell can be simplified.

In one embodiment, the system further comprises a further holder mirror-symmetrical to a holder and a battery cell in a housing with a lid, wherein the battery cell a

Electrode ensemble and covered by the holders comprises collectors.

This system provides a particularly well protected against mechanical influences battery cell.

In this embodiment, the system may further include a motor vehicle, wherein the motor vehicle includes or includes the battery cell. According to the invention, a method for producing a system according to claim 9 is further presented. The method comprises the steps of electrically connecting the collectors by means of a connecting element and inserting the collectors into the holders. Furthermore, the method comprises a step of electrically connecting the collectors inserted into the holders, each with uncoated outer regions of one of the

Electrode ensemble comprised anode foil and one of the Electrode ensemble comprised cathode foil, wherein the compounds each take place in an accessible area of the collectors between the groove and the hollow body of the respective holder. Finally, the method comprises the steps of covering the electrically conductive areas with the cover plates, inserting them into the housing and closing the housing with the cover.

This makes a mechanically secured battery cell particularly easy

be made up.

drawings

Embodiments of the invention will be explained in more detail with reference to the drawings and the description below. Show it:

1 shows a holder, as may be included in an embodiment of the inventive system,

Figure 2 shows a method according to the prior art for the production of a battery cell, and

Figure 3 shows an embodiment of the inventive method for

Production of an embodiment of the system according to the invention.

Embodiments of the invention

In the figure 1, a holder 10 is shown, as it may be included in an embodiment of the inventive system. The holder 10 has a hollow body 20 with at least one opening 25. In the figure, the hollow body is shown as a pipe 20 having a rectangular cross section and side walls 21, 22, but other shapes are possible. Advantageously, the cross section of the opening 25 may be a cross section of an electrode ensemble collector with respect to a main expansion direction of the collector

correspond. The hollow body 20 is connected via a plate 30 with a groove 40. In the exemplary embodiment, the plate 30 connects to a rear wall 43 of the channel 40 and continues this rear wall 43 to a rear wall 23 of the tube 20.

Between the side walls 21, 22 of the tube 20 and side walls 41, 42 of the channel 40 are non-remaining side portions of the holder, which are also referred to below recesses 31, 32. Through the recesses 31, 32, the collector remains accessible after insertion into the holder for an electrically conductive connection of the collector with an electrode layer of an electrode ensemble. The collector itself is also electrically conductive, for example because it consists of a metal or a metal alloy.

The side walls 21, 22 and 41, 42 may have the same or different dimensions in cross section.

After electrically conductive connection of the collector inserted in the holder with an electrode layer, the recesses 31, 32 through

Cover plates are closed. The cover plates can be dimensioned so that, in side walls 21, 22 and 41, 42 in cross section of the same dimensions, they also have the same dimensions in cross section. In particular, the cover plates in thickness and width can correspond to the side walls. Furthermore, the cover plates can be dimensioned so that their length corresponds to the length of the plate 30 or the distance between the channel 40 and hollow body 20 and thus the length of the recesses 31, 32.

The cover plates can be attached to the side walls 21, 22, on the side walls 41, 42 or on the plate 30 hinged so that when opened cover plates, the recesses 31, 32 remain free and covered with closed cover plates, the recesses 31, 32 or

are closed. Then, the holder consists of a channel which is closed at one end tubular.

FIG. 2 shows a method according to the prior art for producing a battery cell. In this case, in a step 100, an insulation pocket 50, for example made of polyolefin, is inserted into a housing 60 made of, for example, aluminum. In a step 200, two collectors 70, 71 are connected to a connecting element 75. The collectors point in the process Terminal attachments 72, 73 on or are connected to terminals 72, 73. In a step 300, the system is made up of collectors 70, 71 and connecting element 75, also referred to as electrode winding or jelly roll

Electrode ensemble 80 connected. Then become outer, not isolated

Regions of electrode layers of the electrode assembly 80 in a step 400 electrically conductively connected to the collectors 70, 71. In a step 500, the system of electrode ensemble 80, collectors 70, 71 and connecting element 75 is inserted into the insulating pocket 50 located in the housing 60. Finally, the housing 60 is closed with a lid 90, the lid 90 leaves the terminals 72, 73 accessible, for example, by the terminals 72, 73 protrude from the lid.

FIG. 3 shows an exemplary embodiment of the method according to the invention for producing a battery cell.

In this exemplary embodiment, the method according to the invention also includes the steps 100, 200, 300, 400, 500 and 600 known from the prior art. The order of the steps is determined only insofar as step 100 before step 500, step 500 before step 600 only after the steps 200, 300 and 400 and step 400 after the steps 200, 300 comes.

In addition, prior to step 400, the embodiment comprises a step 250, in which two mirror-symmetrical exemplary embodiments 10, 11 of the holder according to the invention are placed on the collectors 70, 71 before the collectors 70, 71 are electrically conductively connected to the electrode ensemble 80. By the recesses 31, 32 in the holder 10, 1 1, the step 400 namely, even with attached holders 10, 1 1 run.

In the exemplary embodiment according to FIG. 3, the method also includes a step 450, which is executed after step 400. This step 450 is optional and not necessarily part of the method of the invention. In step 450, cover plates are inserted into the recesses, for example unfolded cover plates, which are hinged to the gutter, to the tube or to the plate of the holder, are collapsed.

Claims

claims

System comprising at least one holder (10, 11) for a collector (70, 71) of an electrode assembly (80), wherein the holder (10, 11) is electrically insulating, characterized in that

the holder (10, 11) comprises a hollow body (20) having at least one opening (25) adapted to receive an end region of the collector (70, 71) with respect to a main extension direction so that the end region (70, 71) of Hollow body (20) is sheathed, wherein the end portion of the collector (70, 71) has an end portion with respect to a

Main expansion direction of the collector (70, 71) is.

A system according to claim 1, wherein the holder (10, 11) comprises a groove (40) adapted to receive the other end portion of the collector (70, 71) with respect to the main extension direction.

A system according to claim 1 or 2, wherein the holder (10, 11) is one for

Main expansion direction parallel formed plate (30) which connects the hollow body (20) with the channel (40).

A system according to any one of claims 1 to 3, wherein the holder (10, 11) is made of electrolyte-resistant plastic.

A system according to any one of claims 1 to 3, wherein the holder (10, 11) is of ceramic.

System according to one of claims 1 to 5, wherein the system further comprises cover plates which are suitable, in each case parallel to

Main extension direction and perpendicular to the plate (30) between the channel (40) and the hollow body (20) to be arranged so as to continue the channel (40) to the opening (25) of the hollow body (20). The system of claim 6, wherein the cover plates are hinged to the plate (30), the gutter (40) or the hollow body (20).

The system according to claim 6 or 7, wherein the system further comprises another holder (1 1) mirror-symmetrical to a holder (10) and a battery cell (99) in a housing (60) with a lid (90), the battery cell (99) comprises an electrode ensemble (80) and collectors (70, 71) encompassed by the holders (10, 11).

The system of claim 8, wherein the system further comprises a motor vehicle comprising the battery cell.

A method of manufacturing a system according to claim 8 or 9, said method comprising the steps of: a. Electrically insulating (200) the collectors (70, 71) by means of a connecting element (75),

b. Inserting (250) the collectors (70, 71) into the holders (10, 11),

c. electrically conductive connection (400) of the collectors (70, 71) inserted into the holders (10, 11), each with uncoated outer regions of an anode foil encompassed by the electrode ensemble (80) and a cathode foil comprised by the electrode ensemble (80) Compounds in each case in an accessible area (31, 32) of the collectors (70, 71) between the channel (40) and the hollow body (20) of the respective holder (10, 1 1),

d. Covering (450) the electrically conductive areas (31, 32) with the cover plates,

e. Insert (500) into the housing (60) and

f. Closing (600) the housing (60) with the lid (70).