DE102020004357A1 - Contacting device for an electrical accumulator and accumulator arrangement - Google Patents

Abstract

The invention relates to a contacting device (1) for an electrical accumulator (3), which comprises a plurality of accumulator cells (4) each having a positive pole (6) and a negative pole (7), with a first busbar (7) for contacting the Positive poles (6) and with a second busbar (9) for contacting the negative poles (7) as well as with a heat transfer body (10) through which a cooling fluid can flow and which is used to control the temperature of the accumulator cells (4) with the positive poles (6) and with the negative poles ( 7) can be thermally coupled. According to the invention, the busbars (8, 9) have at least one channel element (11, 23, 24) through which the cooling fluid can flow and the heat transfer body (10) is at least partially formed by the busbars (8, 9). The invention also relates to an accumulator arrangement (2) with an electrical accumulator (3) and a contacting device (1).

Description

The invention relates to a contacting device for an electrical accumulator, in particular a traction accumulator, of the type specified in claim 1.

Electrically drivable motor vehicles, in particular motor vehicles, have an electrical accumulator which stores electrical energy for an electrical drive unit of the electrically drivable motor vehicle and / or provides electrical energy for the electrical drive unit. Such an accumulator, which can also be called a traction accumulator (“traction battery”), is thus an electrical energy storage device for the electrically drivable or mobile motor vehicle. When the traction accumulator or the electric drive unit is in operation, the traction accumulator has the highest degree of efficiency in a predetermined temperature range. Consequently, it is desirable to temper the electrical accumulator or traction accumulator as quickly as possible in such a way that its operation takes place in the predetermined temperature range.

The traction accumulator is usually formed from a multiplicity of accumulator cells or accumulator cell blocks and is particularly space-consuming in order to meet requirements for an at least partially electric propulsion of the motor vehicle or motor vehicle. The battery cells or cell blocks must be tempered so that they can be operated at their highest possible efficiency. In this case, the temperature control can - depending on the initial situation - include heating and / or cooling of the respective cell or the respective cell block. In this case, the cooling serves in particular to protect the traction accumulator from overheating and, as a result, from damage.

It is also known to at least thermally contact a cooling plate through which a cooling fluid can flow to the traction accumulator to be tempered, in particular to be cooled, in which case heat generated and dissipated by the traction accumulator in a cooling operation by means of the cooling plate, in particular by means of the cooling fluid flowing through it, is transported away. For this purpose, it is known, for example, to arrange the cooling plate on an outer housing of the traction accumulator and / or the individual accumulator cells.

However, there is a need in the case of the electric accumulator to cool it particularly uniformly, in particular with regard to the particularly expansive shape of the traction accumulator. With conventional cooling plates, a temperature gradient arises between an inflow side and an outflow side, via which the cooling fluid flows into or out of the conventional cooling plate, which means that components arranged close to the inflow side, such as accumulator cells arranged close to the inflow side or cell blocks of the traction accumulator, are cooled much more strongly than components or cells / cell blocks that are arranged close to the outflow side of the cooling plate. Because the cooling fluid flows through the cooling plate from the inflow side towards the outflow side, it absorbs heat to be dissipated from the traction accumulator or its cells / cell blocks and is thereby heated. This means that the cooling fluid is already heated when it arrives at the components arranged near the outflow side, so that the ability of the cooling fluid to absorb further heat is at least reduced to absorb the heat to be dissipated from the components near the outflow side to the same extent as of the components that are located close to the inflow side. As a result, in the case of a conventional cooling plate, there is uneven cooling or temperature control of the traction accumulator, which is cooled by means of the conventional cooling plate. This results in a different heat load for the respective accumulator cells or accumulator cell blocks and consequently a different (electrical) load capacity and aging of the corresponding accumulator cells.

This problem can be counteracted at least partially by means of cooling via the battery poles - that is to say for example via the respective positive poles and negative poles of the battery cells. Such pole cooling is for example in a battery module from the US 2019/067763 A1 known, wherein the battery module has a cooling device whose cooling effect acts on busbars which are electrically connected to the poles of battery cells.

The object of the present invention is to provide particularly efficient and low-cost pole cooling for an electrical accumulator.

According to the invention, this object is achieved by a contacting device having the features specified in patent claim 1. Advantageous refinements with expedient developments of the invention are specified in the remaining patent claims.

According to the invention, a contacting device is accordingly provided for an electrical accumulator, in particular a traction accumulator, of a motor vehicle. The traction accumulator is designed to interact with an electric drive device of the motor vehicle, for example in a discharge mode in which the electric traction accumulator of the drive unit of the motor vehicle provides electrical energy for operating or moving the motor vehicle. Furthermore, the traction accumulator can be operated in a charging mode in which the electric drive unit provides the traction accumulator with electrical energy for charging or recharging. This means that the electric drive unit is operated as a motor when the traction accumulator is discharged and as a generator when it is charged. In addition, further operating modes of the electric traction accumulator are possible, for example a further charging mode in which the electric traction accumulator is provided with electrical energy via a charging device external to the vehicle.

The motor vehicle is designed in particular as a motor vehicle, that is to say, for example, as a passenger car and / or truck, and is designed to be at least partially electrically drivable or movable due to the electric drive unit. This means that the motor vehicle is in particular an electric motor vehicle, hybrid motor vehicle, fuel cell motor vehicle, etc. It should be understood that the at least partially electrically drivable or movable motor vehicle (inside the vehicle) has the electric accumulator or traction accumulator, which is coupled or can be coupled to the electric drive unit during operation of the electrically drivable or movable motor vehicle. It also applies to the motor vehicle that it can be designed as a motorcycle, a bus, a self-propelled work machine, etc.

The electrical accumulator or traction accumulator comprises a multiplicity of accumulator cells or a multiplicity of accumulator cell blocks, it being possible for a plurality of accumulator cells to be combined to form the accumulator cell block in the respective accumulator cell block. The respective accumulator cell or the respective accumulator cell block each has a positive pole and a negative pole, which represent contacting elements on the accumulator side.

The contacting device also has two busbars which are designed to contact the respective accumulator cell or the respective accumulator cell block. The two busbars are electrically isolated from one another or arranged in a non-contact manner, a first of the busbars being designed to contact the positive poles of the respective accumulator cell block or the respective accumulator cell and a second of the busbars being designed to contact the negative poles of the respective accumulator cells or cell blocks. This means that the busbars are designed to be connected in an electrically conductive or conductive manner to the battery cells of the electrical battery or of the traction battery via the contacting elements, that is to say via the positive or negative poles. For this purpose, the busbars and the corresponding poles are brought into direct contact with one another, so that in an accumulator arrangement that includes the contacting device and the electrical accumulator, the busbars and the corresponding poles are in direct contact with one another, so that electrical energy (current and voltage) of the battery cells can pass into the busbars and / or vice versa.

The contacting device also has a heat transfer body through which a cooling fluid can flow and which can be thermally coupled to the positive poles and to the negative poles in order to control the temperature of the respective accumulator cell. The cooling fluid is in particular a gas, in particular air, and / or a liquid, for example water. It is also conceivable that the cooling fluid changes its physical state, in particular due to the cooling and / or heating of the respective accumulator cell. Temperature control is accordingly to be understood as both cooling and heating in order to bring the traction accumulator as quickly and / or efficiently as possible to an operating temperature range in which the traction accumulator provides a particularly advantageous degree of efficiency. Since the heat transfer body through which the cooling fluid can flow and the accumulator cells of the electric accumulator or traction accumulator can be thermally coupled to one another via the positive and negative poles and are coupled to one another in the accumulator arrangement, a heat transfer between the heat transfer body or the cooling fluid and the accumulator cells is made possible, namely via the busbars and via the positive poles and / or negative poles connected or connectable to the busbars.

In order to provide a particularly efficient and low-cost pole cooling of the electrical accumulator by means of the contacting device, it is provided that the pole cooling is integrated into the contacting device in a particularly low-cost or simple manner. For this purpose, it is provided according to the invention that the busbars have at least one channel element through which the cooling fluid can flow and the heat transfer body is at least partially formed by the busbars. In other words, it is provided that the heat transfer body has the busbars. The busbars can, for example, be non-positive, positive and / or cohesive with a channel body of the heat transfer body be connected, for example be formed integrally with one another. When producing the contacting device, in particular the heat transfer body, measures are taken to ensure that the busbars remain electrically isolated from one another in the finished contacting device or accumulator arrangement - for example, the busbars are electrically insulated from one another by means of an insulating element and / or the respective busbar and the heat transfer body is electrically insulated from one another by means of an insulation element and / or the channel body of the heat transfer body is formed from an electrically insulating material.

It can therefore be provided that both busbars, that is to say the first busbar for the positive poles and the second busbar for the negative poles, have a common channel element with one another or are formed jointly on a single channel element. Alternatively, it can be provided that the first busbar has a first channel element and the second busbar has a second channel element, the two channel elements and / or the busbars being spatially separated from one another - that is, via a material-free space.

The contacting device thus offers multiple functionality in that the contacting device combines the positive poles of the battery cells or cell blocks to form a common positive pole of the electrical battery and the negative poles of the battery cells or cell blocks to form a common negative pole of the electrical battery. On the other hand, when the electrical accumulator is assembled with the contacting device, the temperature control functionality integrated in the contacting device is brought into interaction with the electrical accumulator, so that the manufacture of the accumulator arrangement is particularly cost-effective.

Temperature control, in particular cooling, of the accumulator cells via the poles is preferable to temperature control via an outer surface of the respective accumulator cell, since the pole temperature control enables more uniform temperature control of the accumulator cells, which leads to slower aging and slower degradation of the accumulator cells, especially if they are used as Lithium-ion cells are formed. Furthermore, the pole temperature control ensures a lower heat transfer resistance, whereby the temperature control of the accumulator cells takes place particularly efficiently. Furthermore, there is an advantage with regard to the packaging, since the contacting device providing the electrical contacting and the battery cell temperature control is designed to be particularly space-efficient. Advantages in terms of packaging are of great interest in vehicle construction, in particular series vehicle construction.

The invention also relates to an accumulator arrangement for a motor vehicle, in particular a passenger car, with an electrical accumulator, which is designed, for example, as a traction accumulator, and with a contacting device. Features, advantages and advantageous configurations of the contacting device according to the invention are to be regarded as features, advantages and advantageous configurations of the accumulator arrangement according to the invention and vice versa.

Further advantages, features and details of the invention emerge from the following description of a preferred exemplary embodiment and with reference to the drawing. The features and combinations of features mentioned above in the description as well as the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures can be used not only in the respectively specified combination, but also in other combinations or on their own, without the scope of the Invention to leave.

• 1 eine schematische Seitenansicht einer Kontaktierungseinrichtung und eines elektrischen Akkumulators;
• 2 eine weitere schematische Seitenansicht der Kontaktierungseinrichtung und des elektrischen Akkumulators aus 1 bzw. 3;
• 3 eine schematische Draufsicht der Kontaktierungseinrichtung und des elektrischen Akkumulators aus 1 bzw. 2;
• 4 eine schematische Draufsicht der Kontaktierungseinrichtung mit dem elektrischen Akkumulator, der Akkumulatorzellen von geradkreiszylindrischer Gestalt aufweist;
• 5 eine schematische Seitenansicht der Kontaktierungseinrichtung mit dem elektrischen Akkumulator, der Akkumulatorzellen mit jeweiligen Polen an einander entgegengesetzten Seiten aufweist;
• 6 eine schematische Draufsicht Kontaktierungseinrichtung mit dem elektrischen Akkumulator, der Akkumulatorzellen mit konzentrisch angeordneten Polen aufweist; und
• 7 eine schematische Seitenansicht der Kontaktierungseinrichtung und des elektrischen Akkumulators aus 6.

It shows

• 1 a schematic side view of a contacting device and an electrical accumulator;
• 2 a further schematic side view of the contacting device and the electrical accumulator 1 or. 3 ;
• 3 a schematic plan view of the contacting device and the electrical accumulator 1 or. 2 ;
• 4th a schematic plan view of the contacting device with the electrical accumulator, which has accumulator cells of straight-circular cylindrical shape;
• 5 a schematic side view of the contacting device with the electrical accumulator, which has accumulator cells with respective poles on opposite sides;
• 6th a schematic plan view of the contacting device with the electrical accumulator, which has accumulator cells with concentrically arranged poles; and
• 7th a schematic side view of the contacting device and the electrical accumulator 6th .

Identical or functionally identical elements are provided with the same reference symbols in the figures.

A contacting device is described below 1 and an accumulator assembly 2 described together.

1 shows the contacting device in a schematic side view 1 and an electric accumulator 3 , the present to the accumulator arrangement 2 are composed. The accumulator arrangement 2 is provided for a motor vehicle (not shown) which is designed in particular as a motor vehicle - that is, as a passenger vehicle and / or as a truck. The motor vehicle can be at least partially electrically driven or moved, which means that the motor vehicle is in particular an electric motor vehicle, hybrid motor vehicle, fuel cell motor vehicle, etc.

The accumulator arrangement 2 accordingly has the electrical accumulator 3 which is also known as a traction accumulator. The electric accumulator or traction accumulator 3 is connectable or connected to an electric drive unit of the motor vehicle or of the passenger car. The electric drive unit has, for example, an electric machine which, in motor operation, generates electric energy that is stored in the accumulator arrangement 2 or in the traction accumulator 3 is stored, converted into mechanical energy for moving the motor vehicle. The electric machine of the electric drive unit of the motor vehicle can also be operated in generator mode, in which the electric machine or the electric drive unit of the motor vehicle of the accumulator arrangement 2 or the traction accumulator 3 provides electrical energy. Such a generator operation of the electric drive unit of the motor vehicle is commonly known as “recuperation operation”.

The traction accumulator 3 has a large number of accumulator cells 4th on what in 1 only a few are shown. It is conceivable that two or more of the accumulator cells 4th are combined to a respective accumulator cell block. The respective battery cell 4th or the respective accumulator cell block has two electrical contacting elements 5 on, namely a positive pole each 6th and a negative pole each 7th (please refer 2 ).

The contacting device 1 further has a first busbar 8th and a second busbar configured differently therefrom 9 on (see 2 ), whereby - only by way of example - the first busbar 8th in the accumulator arrangement 2 with the respective positive pole 6th the battery cell 4th is connected, whereas the second busbar 9 with the negative pole 7th the corresponding accumulator cell 4th connected is. This means that with the contacting device 1 the first power rail 8th is designed to have an electrically conductive or electrically conductive connection with the positive pole 6th the respective battery cell 4th enter into. The second busbar is on the other hand 9 at the contacting device 1 designed to have an electrically conductive or electrically conductive connection to the negative pole 7th the corresponding accumulator cell 4th enter into. For example, it can be provided that the busbars 8th , 9 with the corresponding contacting element 5 , that means either with the respective positive pole 6th or with the respective negative pole 7th to be connected in such a way that electrical energy between the accumulator cell 4th and the respective busbar 8th , 9 can pass. The respective busbar can be used for this 8th , 9 with the corresponding contacting element 5 be non-positively, positively and / or cohesively connected to one another. It is conceivable, for example, that the respective busbar 8th , 9 and the corresponding contacting element 5 or the corresponding contacting elements 5 are soldered, welded, etc. together.

With the contacting device 1 or with the accumulator arrangement 2 is also a heat transfer body 10 provided through which a cooling fluid, for example a gas (such as air) and / or a liquid or cooling liquid (such as water) can flow. The heat transfer body 10 is designed to use the battery cells 4th of the traction accumulator 3 via the electrical contacting elements 5 temperature control, i.e. cooling and / or heating. For this purpose, the heat transfer body through which the cooling fluid can flow is 10 the contacting device 1 with the electrical contacting elements 5 or with the positive poles 6th and / or the negative poles 7th at least thermally coupled and in the accumulator arrangement 2 thermally coupled.

To the temperature control of the accumulator arrangement 2 The contacting device has a particularly simple and / or inexpensive design 1 in the present example a temperature control functionality for the accumulator cells 4th on. The busbars show this 8th , 9 at least one channel element through which the cooling fluid can flow 11 on, the heat transfer body 10 at least partially through the busbars 8th , 9 is formed. In this example, the channel element is 11 in a canal body 12 of the heat transfer body 10 educated. That means that the heat transfer body 10 through the canal body 12 and the busbars 8th , 9 is formed. Here are the (first) canal body 12 and the busbars 8th , 9 non-positively, positively and / or cohesively connected to one another.

In operation of the accumulator arrangement 2 , the traction accumulator 3 by means of the heat transfer body 10 temperature controlled, for example cooled, the cooling fluid flows through the channel element 11 , for example, a large number of individual channels 13 has, of which only a few are provided with the corresponding reference numerals in the figures for reasons of clarity. As the contacting elements 5 over the power rails 8th , 9 with the heat transfer body 10 are thermally coupled or coupled, goes in a cooling mode of the contacting device 1 or the accumulator arrangement 2 a heat or waste heat (in the figures with the symbol for a heat flow W. marked) from the accumulator cells 4th into the canal body 12 of the heat transfer body 10 and finally into the flowing cooling fluid. Consequently, the of the respective battery cell 4th Waste heat generated and dissipated via the contacting elements 5 , over the busbars 8th , 9 , over the canal body 12 and finally via the cooling fluid from the respective accumulator cell 4th transported away. The heat transfer body is accordingly 10 around a heat exchanger.

By the contacting device 1 the busbars 8th , 9 comprehensive heat transfer body 10 has, on the one hand, is a particularly efficient cooling of the respective accumulator cell 4th made possible by means of pole cooling. On the other hand, this is the preferred pole cooling in the accumulator arrangement 2 can be manufactured with little effort, since the accumulator arrangement is manufactured 2 only the contacting device 1 with the accumulator cells 4th is to be connected, with an electrical connection between the busbars 8th , 9 and the traction accumulator 3 as well as a thermal coupling between the electrical contacting elements 5 and the heat transfer body 10 can be produced simultaneously, that is to say in particular in a single work step. Temperature control, in particular cooling, of the battery cells 4th The poles 6.7 are used to control the temperature via an external surface 14th respective accumulator cell 4th preferable, because the pole temperature control ensures a more even temperature control of the accumulator cells 4th is made possible.

2 shows a further schematic side view of the contacting device 1 and the electric accumulator 3 - So the accumulator arrangement 2 . It can be seen that the contacting elements 5 , that means the respective positive pole 6th and the respective negative pole 7th , the respective battery cell 4th on a common side 15th (for example on a top or bottom) of the corresponding accumulator cell 4th or the traction accumulator 3 are arranged. As a result, the bus bars are 8th , 9 also on the common side 15th the battery cell 4th or the traction accumulator 3 arranged and with the corresponding contacting element 5 or the corresponding contacting elements 5 electrically or conductively connected. It follows - how 2 it can be seen - that the two power rails 8th , 9 a common channel element 10 or a common channel body 12 have in the two busbars 8th , 9 with the one channel body 12 are connected. The common channel element is designated by 17 in the figures.

With this configuration of the contacting device 1 or the accumulator arrangement 2 it is further provided that the electrical contacting elements 5 and the canal body 12 of the heat transfer body 10 via a dielectric layer 16 are connected or attached to one another. This means that in the case of the accumulator arrangement 2 the dielectric layer 16 between the canal body 12 and the electrical contacting elements 11 is arranged. Here it can be provided, for example, that the channel body 12 and the dielectric layer 16 are connected to one another, in particular materially, the dielectric layer 16 and the contacting elements 5 are also connected to one another, in particular cohesively. Here is the dielectric layer 16 in particular made of electrically insulating material, creating an undesirable short circuit between the positive pole 6th and the negative pole 7th is avoided. The busbars 8th , 9 are for example in the dielectric layer 16 embedded, the dielectric layer 16 between the busbars 8th , 9 and the canal body 12 is arranged so that the busbars 8th , 9 and the canal body 12 are electrically isolated from each other. In this way it is possible to use the channel body 12 or the channel element 11 from a metallic (i.e. electrically conductive or conductive) material, the positive poles 6th from the negative poles 7th remain electrically isolated. It is preferred at least the channel body 12 of the heat transfer body 10 to be formed from the metallic material, since the metallic material provides a particularly efficient heat transfer, that is to say a particularly low thermal resistance.

3 shows the contacting device in a schematic plan view 1 and the electric accumulator 3 that together the accumulator assembly 2 form. Here is the heat transfer body 10 shown only insofar as the busbars 8th , 9 are shown. Furthermore is the dielectric layer 16 so far shown transparently as the contacting elements 5 that are on the common side 15th are arranged for the viewer of the 3 are visible. It can be seen that the first power rail 8th the positive poles 6th of the traction accumulator 3 to a common positive pole 18th summarize by the respective positive pole 6th the respective battery cell 4th or the respective accumulator cell block with one another via the busbar 8th are short-circuited. It can also be seen that the second busbar 9 a common negative pole 19th forms by means of the second busbar 9 the negative poles 7th the respective battery cell 4th or the respective accumulator cell block are short-circuited to one another. Here are both the positive poles 6th from the negative poles 7th electrically isolated as well as the busbars 8th , 9 from each other.

The in 1 , 2 and 3 the respective battery cell 4th shown with an at least substantially cuboid shape. However, it is conceivable that the respective accumulator cell 4th has a different shape. So shows 4th a schematic plan view of the contacting device 1 with the electric accumulator 3 , the accumulator cells 4th having a straight circular cylindrical shape. This means that an outer surface of the respective accumulator cell 4th according to 4th corresponds to an outer lateral surface of a straight circular cylinder. Further geometrical bodies are also conceivable, to which the respective external shape of the respective accumulator cell 4th follows.

It's still in 4th to recognize that the respective accumulator cell 4th on a first page 20th the respective battery cell 4th , for example on a first (for example lower or upper) top surface, which is called the positive pole 6th trained contacting element 5 has, whereas the accumulator cell 4th on one of the first page 20th opposite second side 21st , for example on a second top surface of the respective accumulator cell 4th that as the negative pole 7th trained contacting element 5 having. Accordingly, the in 4th busbar shown on the left 8th , 9 around the first busbar 8th with the positive poles 6th of the accumulator cells 4th is connectable or connected. In contrast, the in 4th busbar shown on the right 8th , 9 around the second busbar 9 the ones with the negative poles 7th of the accumulator cells 4th connectable or connected. In simple terms, a longitudinal center axis runs 22nd (please refer 5 ) of the respective battery cell 4th perpendicular to the plane of the drawing, the viewer either perpendicular to the positive poles 6th (right in 4th ) or perpendicular to the negative poles 7th (left in 4th ) looks.

5 accordingly shows a schematic side view of the contacting device 1 with the electric accumulator 3 or traction accumulator 3 , where the respective battery cell 4th the positive pole 6th on the first page 20th and the negative pole 7th on the first page 20th opposite side 21st having. A particularly efficient pole temperature control of this traction accumulator 3 the first power rail is to be ensured 8th on the first page 20th of the accumulator cells 4th arranged or arrangeable. Furthermore, the second busbar is 9 on the second side 21st of the accumulator cells 4th arranged or arrangeable. Furthermore, it is then provided that the first busbar 8th a first channel element 23 and the second busbar 9 a second channel element 24 having. That means the channel element 11 the first channel element 23 and the second channel element 24 has or through the first channel element 23 and the second channel element 24 is at least partially formed. It can be provided that the first channel element 23 and the second channel element 24 are fluidically connected to each other, so that the channel elements 23 , 24 can be flowed through by the same cooling fluid. Consequently, another (for example second) channel body 12 be provided so that the first channel element 23 in the first of the canal bodies 12 and the second channel element 24 in the second the channel body 12 is trained.

The remarks made above in relation to the channel element 11 are set out apply accordingly - each separately - for the first channel element 23 and for the second channel element 24 . In this respect it is provided, for example, that between the first busbar 8th and the first channel element 23 the (first) dielectric layer 16 is arranged and / or a further (for example second) dielectric layer 16 between the second busbar 9 and the second channel element 24 is arranged.

The first busbar 8th and the first channel element 23 are present - as in 5 shown - connected to one another in a non-positive, positive and / or cohesive manner, it being provided in particular that the first channel element 23 free from the second busbar 9 is. In contrast, there are the second busbar 9 and the second channel element 24 connected to one another in a non-positive, positive and / or cohesive manner, the second channel element 24 then in particular free of the first busbar 8th is. Here are the accumulator cells 4th between the channel elements 23 , 24 , especially directly between the busbars 8th , 9 , arranged.

The accumulator cells 4th which, as already mentioned, are designed according to a straight circular cylinder, can be used for a particularly space-efficient design of the accumulator arrangement 2 or the traction accumulator 3 be arranged in several rows, the rows being offset from one another and the accumulator cells 4th a row spaced apart from one another by a distance, in particular spaced equidistantly from one another. This is particularly evident when looking at the 5 with the 4th and / or with the 6th clear.

6th shows the contacting device in a schematic plan view 1 with the electric accumulator 3 , where the respective battery cell 4th of the traction accumulator 3 the respective positive pole 6th and the respective negative pole 7th on the common side 15th - So for example on the top or on the bottom - and the two poles 6th , 7th the respective battery cell 4th are arranged concentrically to one another. The respective accumulator cell has this 4th an insulating element 25th on which one is on the common side 15th trained poles 6th , 7th are each electrically isolated from one another. Because by the pole 6th , 7th on the common side 15th the respective battery cell 4th Arranged concentrically to one another, that is, sharing a common center point, is called the negative pole 7th trained contacting element 5 - at least in the plane of the drawing 6th - completely different from that than the positive pole 6th trained contacting element 5 enclosed or - as in the present case - is the positive pole 6th completely from the negative pole 7th enclosed. The contacting device 1 then points to at least one of the busbars 8,9, in the present case to both busbars 8th , 9 , lateral tabs 26th on, which extends along a respective longitudinal narrow side 27 perpendicular to a longitudinal extension of the respective busbar 8th , 9 extend. The tabs 26th are therefore part of the respective busbar 8th , 9 . That means that the respective power rail 8th , 9 including the respective tabs 26th can be formed in one piece. It is also conceivable that the tabs 26th and a base body of the respective busbar 8th , 9 , from which the tabs protrude laterally, are non-positively, positively and / or cohesively connected to one another. Looking at the 6th with the 5 it is clear that the tabs 26th and the main body of the respective busbar 8th , 9 are formed along a common (imaginary) plane.

About the tabs 26th is the respective power rail 8th , 9 with the corresponding contacting element 5 or with the corresponding pole 6th , 7th on the one hand electrically conductive or electrically conductive and on the other hand thermally conductive or thermally conductive connected. For the particularly space-efficient design of the accumulator arrangement 2 or the traction accumulator 3 it is then provided that at least one tab 26th the first busbar 8th between two directly adjacent tabs 26th the second busbar 9 intervenes, whereby - a short circuit between the busbars 8th , 9 exclude - the respective tab 26th the first busbar 8th and the respective tab 26th the second busbar 9 remain spaced from each other and are thus electrically isolated from each other.

7th shows the contacting device in a schematic side view 1 of the electric accumulator 3 , with the busbars 8th , 9 according to 6th are at least partially arranged interlocking. The two interlocking busbars 8th , 9 are across the common dielectric layer 16 with the common channel element 17th connected so that the heat transfer body 10 on the common side 15th the common channel element 17th having channel body 12 and the busbars 8th , 9 having. Accordingly, the statements made in connection with the embodiments of the contacting device apply 1 or the accumulator arrangement 2 in connection with 1 , 2 and 3 were made in an analogous manner for the contacting device 1 or accumulator arrangement 2 that according to 6th and 7th is shown.

List of reference symbols

1

Contacting device

2

Accumulator arrangement

3

(Traction) accumulator

4th

Accumulator cell

5

Contacting element

6th

Positive pole

7th

Negative pole

8th

Busbar

9

Busbar

10

Heat transfer body

11

Channel element

12

Channel body

13

Single channel

14th

Exterior surface

15th

page

16

dielectric layer

17th

common channel element

18th

common positive pole

19th

common negative pole

20th

first page

21st

second page

22nd

Longitudinal central axis

23

first channel element

24

second channel element

25th

Insulating element

26th

Tab

27

Long side

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• US 2019067763 A1 [0006]

Claims (6)

Contacting device (1) for an electrical accumulator (3), which comprises a plurality of accumulator cells (4) each having a positive pole (6) and a negative pole (7), with a first busbar (8) for contacting the positive poles (6) and with a second busbar (9) for contacting the negative poles (7) and with a heat transfer body (10) through which a cooling fluid can flow and which can be thermally coupled to the positive poles (6) and the negative poles (7) to control the temperature of the accumulator cells (4) is, characterized in that the busbars (8, 9) have at least one channel element (11; 23, 24) through which the cooling fluid can flow and the heat transfer body (10) is at least partially formed by the busbars (8, 9). Contacting device (1) according to Claim 1 , characterized in that the busbars (8, 9) can be arranged on a common side (15) of the accumulator cells (4), the channel element (11) being a common channel element (17) of both busbars (8, 9). Contacting device (1) according to Claim 1 , characterized in that the first busbar (8) can be arranged on a first side (20) of the accumulator cells (4) and the second busbar (9) on a second side (21) of the accumulator cells (4) opposite the first side (20) ) can be arranged, wherein the first busbar (8) has a first channel element (23) and the second busbar (9) has a second channel element (24). Contacting device (1) according to one of the preceding claims, characterized in that the negative poles (7) and / or the positive poles (6) with the heat transfer body (10) are attached to one another via a dielectric layer (16). Contacting device (1) according to one of the preceding claims, characterized in that the first busbar (8) and / or the second busbar (9) have / has lateral tabs (26) along at least one longitudinal narrow side (27). Accumulator arrangement (2) for a motor vehicle, with an electrical accumulator (3) and one according to one of the Claims 1 to 5 trained contacting device (1).

Images