DE102007063194A1 - Cell assembly for battery, comprises multiple parallel or serial solitary cells interconnected together, where solitary cells are connected with heat conducting plate - Google Patents

Abstract

The cell assembly (1) comprises multiple parallel or serial solitary cells (1.1) interconnected together. The solitary cells are connected with a heat conducting plate. A blank mold (1.6) is provided during positioning a filler material. The blank mold partially or completely surrounds the outer contour of the solitary cells and the heat conducting plate, and is a polyethylene shrink film or a polypropylene shrink film. The filling material (1.5) is polyurethane-foam, an epoxy resin or silicon foam. Independent claims are included for the following: (1) a battery; and (2) a method for manufacturing cell assembly.

Description

The invention relates to a cell assembly comprising a heat conduction plate for tempering and a plurality of parallel and / or serially interconnected individual cells according to the preamble of claim 1, as used for example in the older DE 10 2007 010 759 is described. Furthermore, the invention relates to a method for producing a cell composite.

In the older one DE 10 2007 010 759 a battery is described which has a plurality of parallel and / or serially interconnected individual cells, which are placed on a heat conducting plate and connected to this heat-conducting. The heat conducting plate (also called cooling plate) is cooled by a coolant, for. As air conditioning coolant, cooled. For optimum dissipation of the heat in the heat conducting plate, the gaps between the individual cells and the heat conducting plate are filled with a good thermal conductivity potting compound or foam mass.

to Simplification of the introduction of potting compound or foam compound and to improve the heat dissipation is around the cell composite from single cells and heat conducting plate an envelope or jacket plate arranged, which with external cooling bars and the heat conducting plate is soldered. After one Insertion and mounting of the single cells on the heat conduction plate becomes the space between the single cells, the single cells and the jacket plate and / or the single cells and the heat conducting plate filled with potting or foam compound. After the casting arises the so-called cell block or a cell network, a massive Construction, for example by means of screwing in the battery case is attached. After installing the inside of the battery will the housing cover by screwing, riveting, gluing or Attached welding. The casting or filling process is particularly complex and time consuming. Furthermore must be ensured that, for example, made of aluminum manufactured jacket sheet z. B. not by means of insulation elements the single cells or the electrical contact terminals electrically contacted. This requires the finished Cell composite and the battery made of it by that of the outer Single cells spaced jacket sheet a large amount of space.

Of the The invention is therefore based on the object, a cell composite and indicate a battery formed from which, if sufficient good heat dissipation the lowest possible Have space requirements. In addition, one is special specify simple method for producing a cell network.

Regarding the cell composite, the object is achieved according to the invention by the features specified in claim 1. Regarding the battery and of the method, the object is achieved according to the invention by the features specified in claim 15 or in claim 17. Advantageous developments of the invention are the subject of the dependent claims.

Of the Cell grouping with several parallel and / or serially interconnected Single cells that conduct heat with a heat conducting plate are connected, in cavities between the individual cells and / or between the heat conducting plate and the individual cells a filler largely kraft-, substance and / or positive fit can be arranged, according to the invention comprises at least when introducing the filler one the outer contour the single cells and the heat conducting at least partially or largely completely surrounding filling form, at least in the area of outer single cells partially attached to these non-positively and / or positively. hereby is a space-optimized and cost-saving formation of the cell network allows.

For supports the space-optimized training of the cell network the filling mold preferably on the outer contour the cell composite from and / or is attached to the outer contour, z. B. welded or soldered. It supports the filling shape in particular at the respective outer contour the outer single cells and / or the outer Wall of the heat conduction from and / or is at this or this attached.

Conveniently, is the filling form before the introduction of the filling material on the outer contour of the cell network in a particular easy manner applicable, in particular windable or sliding. Depending on the size and shape of the cell network to be formed is the filling form one or more layers on the outer contour of the cell composite can be applied.

In one possible embodiment, the filling mold is designed as a shrinkable form, in particular shrink film. In the context of the present invention, a filling mold is understood in particular to mean a shrinking mold which serves as a casting mold or foam mold and which forms the outer contour of the cell composite after introduction and curing of the filling material. By using a shrink mold, the individual cells and the heat conducting plate are clamped together during molding of the filling material and thereby resulting shrinkage of the shrink mold under form, force and / or material connection. In addition, corresponds by the non-positive and / or positive fit of the shrink mold on the outer individual cells and / or the outer wall of the Heat conducting the outer contour of the cell composite largely the outer contour of the outer individual cells and the outer wall of the heat conducting, so that a particularly space-optimized cell composite is formed.

Preferably the filling form is a polyethylene shrink film or a Polypropylene shrink wrap or a polyethylene / polypropylene shrink wrap. By such, non-metallic and non-electrically conductive Forming the filling mold in particular as a plastic shrink film are elaborate and additional from the state of the art known support or isolation elements for support the filling form safely avoided. Furthermore Such plastic shrink films have a high shrinkage force and low shrinking temperatures, so that the single cells and the heat conducting plate to form the cell composite can be easily and safely clamped together.

Conveniently, is the filling material with a predeterminable temperature in the cavities einbringbar, wherein the filling mold the filling material into the cavities form, force and / or cohesively impressed and / or to the single cell and the heat conducting plate form, force and / or cohesively presses.

ever by default, the filling is after curing of the introduced into the cavities filling material removable or permanently shrunk onto the cell composite.

When Filler material is in particular an electrically insulating and / or thermally conductive filler material used. As a result, the individual cells and the heat conducting plate on the one hand electrically separated from each other. On the other hand, one is given sufficiently good overheating protection by the Heat of the single cells over the filling material is well drained. In this case, the filler even heat-conducting, if only slightly, be. Alternatively or additionally, the filling material with thermally conductive additives, eg. B. metal splinters, be provided.

Especially in a cell assembly for lithium-ion cells is the Filler preferably cold-curing because the maximum permissible temperature of lithium-ion cells executed.

For a bubble-free as possible and particularly preferred bubble-free Fill the cavities with the filler this is preferably a potting compound or a Füllschaum. As particularly preferred materials are for the filler Hard or soft foam, a polyurethane foam, an epoxy resin and / or used a silicone foam.

Of the Cell composite is in the finished final state with hardened Filler material especially when used for a Battery arranged as a unit in a battery case and optionally attached to this. Preferably, the cell composite for a battery, a vehicle battery, in particular a Battery for a vehicle with hybrid drive or for a fuel cell vehicle used.

A preferred production of the cell composite takes place in such a way that the outer contour of the single cells and the heat conducting plate formed cell composite at least partially or substantially completely surrounded by a filling mold, at least in the area the individual cells partially non-positively and / or positively abuts them, wherein in cavities between the individual cells and / or between the heat conducting plate and the individual cells a filling material is introduced, by means of the filling mold at a given Temperature by shrinkage of the filling form, force and / or cohesively pressed into the cavities and / or to the individual cells and / or the heat conducting plate is pressed. The filling form can be permanent shrunk onto the cell composite. Alternatively, the filling form after curing of the introduced filling material be removed again.

embodiments The invention will be explained in more detail with reference to a drawing. Showing:

1 schematically in a perspective view of a cell composite with a plurality of parallel and / or serially interconnected individual cells, which are thermally conductively connected to a heat conducting plate, wherein the outer individual cells and the outer wall of the heat conducting plate are surrounded by a filling form at least partially form-fitting

2 schematically the cell composite according to 1 in side view, and

3 schematically the cell composite according to 2 in cross section through an in 2 shown section plane III-III.

each other corresponding parts are in all figures with the same reference numerals Mistake.

1 schematically shows a perspective view of a cell composite 1 for a battery, not shown, in particular a vehicle battery for a hybrid vehicle or a fuel cell vehicle. For example, the vehicle battery may be a lithium or lithium-ion battery.

The cell network 1 comprises several parallel and / or series interconnected single cells 1.1 , z. B. lithium-ion battery cells. The single cells 1.1 For example, are of a thin metal sheet, in particular an aluminum sheet, jacketed.

In Ausführungsführungsbeispiel according to 1 are the single cells 1.1 bottom side with a heat conducting plate 1.2 thermally conductive connected. Alternatively, the single cells 1.1 also on the head side with the heat conducting plate 1.2 be connected. Depending on the shape, size and / or function of the underlying battery is a plurality of single cells 1.1 arranged in a predeterminable structure. In the embodiment according to 1 are the single cells 1.1 For example, for a space-optimized arrangement honeycomb-shaped, that is offset in rows and columns to each other, arranged.

The heat conduction plate 1.2 serves in particular as a cooling plate. Ie. the single cells 1.1 be from the ground or alternatively from the head through the heat conducting plate 1.2 cooled. For this purpose, the heat conducting plate 1.2 flows through a cooling medium, which via a connection 1.3 and heated as heated cooling medium is discharged again. To dissipate the heat from the single cells 1.1 to the heat conduction plate 1.2 is in cavities 1.4 , in particular slit-shaped cavities 1.4 , between the individual cells 1.1 and between the individual cells 1.1 and the heat conducting plate 1.2 a filler 1.5 form, material and / or non-positively arranged, which in 3 but not yet 1 is filled. The filling material 1.5 is electrically insulating and cold curing and thus causes the electrical isolation of adjacent single cells 1.1 and opposite the heat conducting plate 1.2 and fixed in the cured state, the individual cells 1.1 and the heat conduction plate 1.2 to the cell network shown 1 ,

In a further embodiment, in addition to the filling material 1.5 between the individual cells 1.1 be arranged in a manner not shown cooling or Wärmeleitstäbe formed, for example, made of metal, especially aluminum and in the heat conduction 1.2 are anchored.

For filling the filling material 1.5 are the outer single cells 1.1 and the outer wall of the heat conduction plate 1.2 from a filling mold 1.6 surrounded at least partially (as shown) or completely non-positively and / or positively. In particular, the filling mold is supported 1.6 on the outer contour of the cell network 1 , especially at the outer single cells 1.1 and / or the outer wall of the heat conducting plate 1.2 from and / or is attached to this or this. The filling and curing of the filling material 1.5 formed cell network 1 is after curing of the filling material 1.5 used in a not-shown battery housing.

For the production of the cell network 1 with the through the filler 1.5 clampable single cells 1.1 and the tensionable Wärmeleitplatte 1.2 becomes the filling form 1.6 before introducing the filling material 1.5 on the outer contour of the not yet cast cell composite 1 ie the outer single cells 1.1 and the outer wall of the heat conduction plate 1.2 applied, z. B. wound or pushed.

For such a simple mechanical and in particular non-positive and / or positive application of the filling form 1.6 on the with the filler 1.5 not yet cast cell composite 1 is the filling form 1.6 formed as a shrink mold, in particular a shrink film, through which the components of the cell composite 1 - the single cells 1.1 and / or the heat conducting plate 1.2 - Are clamped together.

2 shows schematically the still unshrouded and unstrained cell structure 1 according to 1 in side view.

3 shows the means of filling material 1.5 and the filling form 1.6 strained individual cells 1.1 and the heat conduction plate 1.2 as a cell network 1 in cross section through an in 2 shown section plane III-III.

As in 3 represented, lies the filling form 1.6 positive and / or positive fit to the outer individual cells 1.1 at. As a filling mold 1.6 In particular, a plastic shrink film is used, which is particularly easy on the outer single cells 1.1 and the outer wall of the heat conduction plate 1.2 both positively and non-positively wound or can be postponed in a tubular formation of the shrink film. In this case, the filling form 1.6 one or more layers on the outer contour of the still unfilled and unclamped cell composite 1 applied, in particular wound. In addition to the positive and / or positive application of the filling form 1.6 this may be due to the outer single cells 1.1 and / or the outer wall of the heat conducting plate 1.2 also applied cohesively, in particular fixed, z. B. welded or soldered, be. For example, the filling form 1.6 along the longitudinal extent of the outer single cells 1.1 to this z. B. welded or soldered.

As suitable materials for the filling form 1.6 shrink film as conventional shrink films with high shrinkage force and low shrinkage temperature such. As a polyethylene, a polypropylene or a polyethylene / polypropylene shrink film used.

After attaching the filling form 1.6 around the outer contour of the cell network 1 without filling material 1.5 becomes the filling material 1.5 with a predeterminable temperature in the cavities 1.4 filled. For example, the filler material 1.5 depending on the type of film and / or on the film thickness of the filling mold 1.6 a temperature in a range of 120 ° C to 250 ° C on. With decrease of the temperature and thus during hardening of the introduced filling material 1.5 shrinks the filling form 1.6 , whereby the filler material 1.5 positive, force and / or material fit in the cavities 1.4 pressed in and to the individual cells 1.1 and / or the heat conducting plate 1.2 be pressed so that these to the cell composite 1 be tense. Depending on the type of filling form 1.6 this is after hardening of the in the cavities 1.4 introduced filling material 1.5 removable. Alternatively, the filling form 1.6 Shrinked permanently. Also, a shrinkage of the filling form 1.6 possibly omitted when the filling form 1.6 according to force, substance and / or positive and thus close to the outer contour of the still unfilled cell composite 1 is applied. In this case, a correspondingly tempered filling material 1.5 , in particular unheated filling material 1.5 be filled.

Depending on the type and form of applying the filling form 1.6 on the still unfilled cell composite 1 can the filling form 1.6 the cell network 1 in a manner not shown overlap head or bottom side or completely surrounded this, wherein the filling mold 1.6 in this area depending on the specification on the cell network 1 sealed, z. B. welded, and / or permanently shrunk. Alternatively, the filling form 1.6 after curing of the filled filling material 1.5 completely removed.

The filling material 1.5 is in particular electrically insulating. In addition, the filler is 1.5 thermally conductive to those at the individual cells 1.1 resulting heat to the head or bottom side arranged Wärmeleitplatte 1.2 derive. In this case, the filler 1.5 even be made slightly thermally conductive. Alternatively or additionally, the filling material 1.5 with thermally conductive additives, eg. B. metal splinters, be provided. Suitable materials for the filling material 1.5 As potting compound or Füllschaum are, for example, an epoxy resin, a rigid foam or thermosetting foam or a flexible foam or thermosetting flexible foam, in particular a polyurethane foam or a silicone foam. By such materials, the free or cavities 1.4 preferably low in bubbles and preferably filled free of bubbles.

1

cell assembly

1.1

Single cells

1.2

heat conduction

1.3

connection

1.4

cavities

1.5

filling material

1.6

blank mold

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102007010759 [0001, 0002]

Claims (21)

Cell network ( 1 ) of several parallel and / or serially interconnected single cells ( 1.1 ), the heat-conducting with a heat conducting plate ( 1.2 ), wherein in cavities ( 1.4 ) between the individual cells ( 1.1 ) and / or between the heat conducting plate ( 1.2 ) and the single cells ( 1.1 ) a filling material ( 1.5 ) is largely form, force and / or material fit can be arranged, characterized in that at least during introduction of the filling material ( 1.5 ) one the outer contour of the single cells ( 1.1 ) and the heat conducting plate ( 1.2 ) at least partially or substantially completely surrounding filling form ( 1.6 ) is provided which, at least in the area of outer single cells ( 1.1 ) partially applied to these non-positively and / or positively. Cell composite according to claim 1, characterized in that the filling form ( 1.6 ) on the outer contour of the cell network ( 1 ) is supported and / or attached to the outer contour. Cell composite according to claim 1 or 2, characterized in that the filling form ( 1.6 ) at the respective outer contour of the outer single cells ( 1.1 ) and / or the outer wall of the heat conducting plate ( 1.2 ) is supported and / or attached to this or this. Cell composite according to one of claims 1 to 3, characterized in that the filling form ( 1.6 ) before introducing the filling material ( 1.5 ) on the outer contour of the cell network ( 1 ) can be applied, in particular windable or slidable. Cell composite according to one of claims 1 to 4, characterized in that the filling form ( 1.6 ) is formed as a shrink mold, in particular shrink film. Cell composite according to one of claims 1 to 5, characterized in that the filling form ( 1.6 ) one or more layers on the outer contour of the cell composite can be applied. Cell composite according to one of claims 1 to 6, characterized in that the filling form ( 1.6 ) is a polyethylene shrink film or a polypropylene shrink film or a polyethylene / polypropylene shrink film. Cell composite according to one of claims 1 to 7, characterized in that the filling material ( 1.5 ) with a predeterminable temperature in the cavities ( 1.4 ) can be introduced, wherein the filling form ( 1.6 ) the filling material ( 1.5 ) in the cavities ( 1.4 ) impresses positively and / or cohesively and / or to the single cell ( 1.1 ) and / or the heat conducting plate ( 1.2 ) presses positively, force and / or materially. Cell composite according to claim 8, characterized in that the filling form ( 1.6 ) after curing in the cavities ( 1.4 ) introduced filling material ( 1.5 ) is removable or permanently shrunk. Cell composite according to one of claims 1 to 9, characterized in that the filling material ( 1.5 ) is electrically insulating and / or thermally conductive. Cell composite according to one of claims 1 to 10, characterized in that the filling material ( 1.5 ) is even thermally conductive or is provided with thermally conductive additives. Cell composite according to one of claims 1 to 11, characterized in that the filling material ( 1.5 ) is cold-curing. Cell composite according to one of claims 1 to 12, characterized in that the filling material ( 1.5 ) is a potting compound or a Füllschaum. Cell composite according to one of claims 1 to 13, characterized in that the filling material ( 1.5 ) is a polyurethane foam, an epoxy resin and / or a silicone foam. Battery with a cell network ( 1 ) according to one of claims 1 to 14, which is arranged in a battery housing. Battery according to claim 15, characterized in that that this is a vehicle battery, in particular a battery for a vehicle with hybrid drive or for a fuel cell vehicle is. Method for producing a cell network ( 1 ) according to one of claims 1 to 14, characterized in that the outer contour of the out of the individual cells ( 1.1 ) and the heat conducting plate ( 1.2 ) formed cell composite at least partially or substantially completely of a filling form ( 1.6 ), which at least in the region of outer single cells ( 1.1 ) is partially non-positively and / or positively applied to these, wherein in cavities ( 1.4 ) between the individual cells ( 1.1 ) and / or between the heat conducting plate ( 1.2 ) and the single cells ( 1.1 ) a filling material ( 1.5 ) is introduced, which by means of the filling mold ( 1.6 ) at a predetermined temperature by shrinkage of the filling mold ( 1.6 ) positively, positively and / or cohesively into the cavities ( 1.4 ) and / or to the individual cells ( 1.1 ) and / or the heat conducting plate ( 1.2 ) is pressed. Method according to claim 17, characterized in that the filling mold ( 1.6 ) permanently on the cell network ( 1 ) is shrunk. Method according to claim 17, characterized in that the filling mold ( 1.6 ) after curing of the introduced filling material ( 1.5 ) is removed again. Method according to one of claims 17 to 19, characterized in that as filling form ( 1.6 ) a shrink mold, in particular a shrink film is used. Method according to one of claims 17 to 20, characterized in that as filling material ( 1.5 ) a potting compound or a Füllschaum, in particular an epoxy resin, a hard or soft foam, a silicone foam, a polyurethane foam is introduced.