阅读说明：本技术 电池单元接触接通装置以及蓄电器 (Battery cell contact device and electric storage device ) 是由 M·A·陈 M·格拉泽 M·胡贝尔 F·普里彻 A·M·瓦德尔 于 2020-09-24 设计创作，主要内容包括：本发明涉及一种电池单元接触接通装置(12、14、16、18),其用于将用于至少部分地电动运行的机动车的蓄电器(10)的第一电池元件与所述蓄电器(10)的第二电池元件连接,包括：连接元件(20),以用于第一电池元件和第二电池元件的电连接；以及构造为熔断器的用于过压保护的电保险元件,其中,连接元件(20)具有第一横截面区域(22)和与第一横截面区域(22)不同的第二横截面区域(24),其中,熔断器构成在第二横截面区域(24)中并且第二横截面区域(24)具有相对于第一横截面区域(22)而言减小的横截面作为熔断器。本发明还涉及一种蓄电器(10)。(The invention relates to a cell contact-making device (12, 14, 16, 18) for connecting a first cell of an electrical storage device (10) of a motor vehicle, which is intended to be operated at least partially electrically, to a second cell of the electrical storage device (10), comprising: a connection element (20) for electrical connection of the first battery element and the second battery element; and an electrical fuse element for overvoltage protection, which is designed as a fuse, wherein the connecting element (20) has a first cross-sectional area (22) and a second cross-sectional area (24) that differs from the first cross-sectional area (22), wherein the fuse is formed in the second cross-sectional area (24) and the second cross-sectional area (24) has a cross-section that is reduced relative to the first cross-sectional area (22) as a fuse. The invention also relates to an accumulator (10).)

1. Cell contact-making device (12, 14, 16, 18) for connecting a first cell element of an electrical storage device (10) of a motor vehicle for at least partial electric operation to a second cell element of the electrical storage device (10), comprising: a connection element (20) for electrical connection of the first battery element and the second battery element; an electrical fuse element for overvoltage protection in the form of a fuse,

it is characterized in that the preparation method is characterized in that,

the connecting element (20) has a first cross-sectional area (22) and a second cross-sectional area (24) that is different from the first cross-sectional area (22), wherein the fuse is formed in the second cross-sectional area (24) and the second cross-sectional area (24) has a cross-section that is reduced relative to the first cross-sectional area (22) as a fuse.

2. Cell contact making device (12, 14, 16, 18) according to claim 1, characterised in that the second cross-sectional area (24) has at least one hole (28) for reducing the cross-section.

3. Cell contact making device (12, 14, 16, 18) according to claim 1 or 2, characterized in that the second cross-sectional area (24) has at least one gap for reducing the cross-section.

4. Cell contact making device (12, 14, 16, 18) according to one of the preceding claims, characterised in that the second cross-sectional area (24) has at least one tab for reducing the cross-section.

5. Cell contact make-up device (12, 14, 16, 18) according to any of the preceding claims, wherein the second cross-sectional area (24) has a width of 2mm²To 12mm²In particular 5mm²And 8mm²The area in between.

6. Cell contact making device (12, 14, 16, 18) according to one of the preceding claims, characterized in that the cell contact making device (12, 14, 16, 18) forms two battery elements designed as individual cells (26) for connecting the energy accumulator (10).

7. Cell contact making device (12, 14, 16, 18) according to one of the preceding claims, characterized in that the cell contact making device (12, 14, 16, 18) forms two battery elements designed as a cell row (28) for connecting the energy accumulator (10).

8. Cell contact making device (12, 14, 16, 18) according to one of the preceding claims, characterized in that the cell contact making device (12, 14, 16, 18) is designed for connecting two battery cells designed as a cell row (28), wherein a first cell row (28) is supported on a first side (30) of an intermediate pressure plate (32) of the energy storage device (10) and a second cell row (28) is supported on a second side (34) of the intermediate pressure plate (32) opposite the first side (30).

9. Cell contact making device (12, 14, 16, 18) according to one of the preceding claims, characterized in that the cell contact making device (12, 14, 16, 18) forms two battery elements designed as battery modules (36, 40) for connecting the energy accumulator (10).

10. Accumulator (10) for an at least partially electrically operated motor vehicle, comprising at least one cell contact making device (12, 14, 16, 18) according to one of claims 1 to 9.

Technical Field

The invention relates to a cell contact making device for connecting a first cell element of an accumulator of a motor vehicle, which is intended to be operated at least partially electrically, to a second cell element of the accumulator, according to the preamble of claim 1. The invention also relates to an accumulator.

Background

It is known from motor vehicle construction that a plurality of battery cells or a plurality of battery cell modules can be constructed together with one another in order to increase the energy density in an at least partially electrically operated motor vehicle. In particular, this can lead, for example, to a corresponding excessively high nominal voltage of the individual battery cell modules when a plurality of individual battery cells or battery cell rows or battery cell modules are connected in series. In order to be able to implement a corresponding overvoltage protection, the corresponding fuse is installed as an additional component.

EP 2878018B 1 describes an energy storage device comprising energy accumulators, wherein the energy accumulator cells of the energy accumulators are each connected on their poles to a circuit board by means of electrically and thermally conductive flat contact elements made of an elastic material, which is provided to separate an electric current flowing through the contact elements from a heat flow obtained by the contact elements, wherein the flat contact elements made of an elastic material are elastically deformed by a change in length expansion in a direction perpendicular to the contact surfaces of the poles, wherein the circuit boards each have an electrically and thermally conductive first layer, which bears against the contact elements, wherein the first layer of the circuit board conducts the electric current flowing through the contact elements transversely and transfers the heat flow flowing over the flat contact elements to a heat-conducting second layer of the circuit board, the second layer discharges the heat flow received from the first layer of the circuit board to the environment or to a cooling medium, and the second layer of the circuit board is electrically conductive and is separated from the electrically conductive first layer of the circuit board by an electrically insulating intermediate layer of the circuit board, wherein the electrically insulating intermediate layer of the circuit board is made of a thermally conductive material, wherein flat contact elements which are arranged on both poles of the accumulator cell are arranged between the respective pole of the accumulator cell and the respective circuit board, wherein the elastic material of the flat contact elements is an elastic contact-making material which is made of a mixture of an elastomer and metal particles or of an electrically conductive elastomer and electrically and thermally connects two electrical conductors without the electrical conductors being in contact, wherein the surfaces of the respective poles or electrical conductors are completely or partially protected against contact with moisture.

Disclosure of Invention

The object of the present invention is to provide a cell contact-making device and an electrical energy store, by means of which the electrical energy store can be protected against overvoltages in an improved manner.

This object is achieved by a battery cell contact making device and an accumulator according to the independent claims. Advantageous embodiments are given in the dependent claims.

One aspect of the invention relates to a cell contact making device for connecting a first cell element of an electrical storage device of a motor vehicle for at least partial electrical operation to a second cell element of the electrical storage device, comprising: a connection member for electrical connection of the first battery element and the second battery element; an electrical fuse element designed as a fuse for overvoltage protection.

Provision is made for the connecting element to have a first cross-sectional area and a second cross-sectional area different from the first cross-sectional area, wherein the fuse is formed in the second cross-sectional area and the second cross-sectional area has a reduced cross-section relative to the first cross-sectional area as a fuse.

This makes it possible to simplify the overvoltage protection in the energy storage device. In particular, the fuse is designed such that the cross section in the region of the second cross-sectional area is reduced, whereby in particular an overvoltage protection is achieved. In other words, if an excessively high current is to be generated in the accumulator, the connecting element is placed in melting in the region of the second cross section, in other words in the region of the second cross section. Thus, to a simplified fuse. In particular, the fuse is thus integrated in the second cross-sectional area. The fuse is not separately constructed. The fuse is thus connected in one piece with the connecting element.

The energy accumulator is in particular an energy accumulator comprising at least one prismatic energy cell. For example, the prismatic energy cells can be configured as circular cells.

In other words, it is provided that the battery element is connected to the second battery element by a fuse, wherein the fuse is not implemented as an additional component, but is integrated directly into the current-carrying component of the battery contact making system, in particular of the battery cell contact making device. Due to the special requirements of the components in the energy store and the special requirements of short-circuit applications, for example, at the battery cell level, the cell contact making device can be adjusted accordingly, for example, on the basis of a special activation duration, on the basis of other protection levels of the battery cells or of the storage level, or on the basis of the mechanical load of the driving vehicle, wherein the design of the second cross-sectional area is then correspondingly different here. In other words, an advantageous reduction in the cross-section is involved in the second cross-sectional area in order to generate as little residual heat as possible.

In particular, in the present invention, a cross section is understood to mean an electrical cross section. In other words, the volume of the electrical conductor can be reduced accordingly, in particular in order to reduce the cross section, as a connecting element.

According to an advantageous embodiment, the second cross-sectional area has at least one opening for reducing the cross-section. For example, the bore may be configured as a bore hole. The shape of the holes can be configured round, oval or rectangular.

In particular the cross-sectional area has a plurality of holes, whereby the second cross-sectional area is reduced in this cross-section. Thereby, the cross section can be reduced in a simple manner, whereby a fuse can be provided.

Furthermore, it is advantageous if the second cross-sectional area has at least one gap for reducing the cross-section. In particular, it can be provided that the second cross-sectional area has a plurality of slots. By using the slit, the second cross-sectional area can be reduced in a simple manner with respect to the first cross-sectional area. Thereby, the fuse can be provided in a simple manner.

It is also advantageous if the second cross-sectional area has at least one web for reducing the cross-section. In particular, the second cross-sectional area can have a plurality of webs for reducing the cross-section. In particular, it is possible to achieve that the second cross-sectional area has a reduced cross-section in a simple manner compared to the first cross-sectional area. In other words, it can be provided, for example, that the reduction of the cross section of the connecting element is carried out by a plurality of thin lines in the second cross-sectional area, so that the overall cross section is reduced in the second cross-sectional area.

Preferably, it can be provided that the second cross-sectional area can have different combinations of holes and/or slits and/or tabs in order to reduce the cross-section.

Furthermore, it has proven to be advantageous if the second cross-sectional area has a cross-sectional area of 2mm²To 12mm²In particular 5mm²And 8mm²The area in between. In particular, the fuse has a diameter of 2mm²To 12mm²In particular 5mm²And 8mm²The area in between. In particular, it has proven to be advantageous for this area, depending on the triggering duration or the protection level, in order to realize a corresponding simple, yet reliable fuse for connecting the first battery element and the second battery element.

In a further advantageous embodiment, the cell contact-making means form two battery elements designed as individual cells for connecting the energy accumulator. The energy accumulator therefore has at least two individual cells which are in contact with one another. The contacting is now effected by means of the battery cell contacting device. If an overcurrent is now to occur between the individual battery cells, a fuse can be provided by means of the battery cell contact-making means, which fuse protects the individual battery cells from the excessively high currents. For example, prismatic cells, round cells or pouch cells can be considered as a single cell.

Furthermore, it is advantageous if the cell contact connection device forms two battery elements designed as a cell row for connecting the energy accumulator. In other words, it is provided, in particular, that the battery cell row has a plurality of individual battery cells, which are connected to one another, in particular in series. In order to connect the respective rows of battery cells to one another, the battery cell contact-making device according to the invention can now be used. This makes it possible to form the contact-making elements between the battery cell rows as the battery cell contact-making means, so that an integrated fuse can be provided. In particular, the respective battery cell row can thus be protected against overcurrent.

In a further advantageous embodiment, the cell contact making device is designed for connecting two battery elements designed as battery cell rows, wherein a first battery cell row is supported on a first side of an intermediate pressure plate of the accumulator and a second battery cell row is supported on a second side of the intermediate pressure plate opposite the first side. In particular, the so-called cell respiration effect (zelattmung) occurs in prismatic battery cells. In order to be able to compensate for the corresponding respiration effect of the unit, the energy accumulator has a corresponding intermediate pressure plate. In order to bridge this intermediate pressure plate, the energy accumulator in turn has corresponding electrical contact-making elements. It can now be provided that these contact-making elements are designed as cell contact-making devices across the intermediate pressure plate. Accordingly, a fuse may be provided across the intermediate pressing plate, thereby protecting the battery cell rows from an overcurrent.

Furthermore, it has proven to be advantageous if the cell contact-making device forms two battery elements designed as battery modules for connecting the energy accumulator. If, for example, the electrical storage device is to have a plurality of battery modules, the respective battery modules of the contact-making device can be electrically connected to one another. The battery module has, in particular, a plurality of battery cell rows. The respective battery cell row in turn has in particular a plurality of individual battery cells.

Preferably, it can be provided that the cell contact switch-on device is formed both between the respective individual cells and between the respective cell rows and between the battery modules. In this way, corresponding cell contact making devices can be used at different electrical levels of the energy store, so that corresponding overvoltage protection can be achieved. In particular, the cell contact-making means can then be designed differently and, for example, have different cross-sectional areas, so that the cross-sectional areas are adapted to the respective contact-making position.

Another aspect of the invention relates to an electrical storage device for an at least partially electrically operated motor vehicle, comprising at least one battery cell contact making device according to the preceding aspect.

A further aspect of the invention relates to a motor vehicle comprising an accumulator according to the preceding aspect. The motor vehicle is at least partially electrically operated. In particular, the motor vehicle can also be operated fully electrically.

Further features of the invention emerge from the claims, the figures and the description of the figures. The features and feature combinations described above in the description and subsequently in the description of the figures and/or shown in the figures alone can be used not only in the respectively given combination but also in other combinations or alone.

Drawings

The invention will now be explained in more detail by means of preferred embodiments and with reference to the accompanying drawings. In the drawings:

fig. 1 shows a schematic plan view of an embodiment of an electrical storage device comprising an embodiment of a cell contact making device;

fig. 2 shows a schematic top view of an embodiment comprising a cell contact making device; and

fig. 3 shows a schematic cross-sectional view of an embodiment of a cell contact-making device.

Detailed Description

In the figures, identical or functionally identical elements are provided with the same reference symbols.

Fig. 1 shows an embodiment of an electrical storage device 10, which includes an embodiment of a cell contact making device 12, 14, 16, 18, in a schematic plan view. The electrical energy storage device 10 forms a not shown motor vehicle for at least partial electric operation. In particular, the motor vehicle is operated fully electrically. In particular, the motor vehicle can be designed, for example, as a truck or as a passenger car.

The cell contact making devices 12, 14, 16, 18 are designed to connect a first battery element of an electrical storage device 10 of a motor vehicle for at least partial electric operation to a second battery element of the electrical storage device 10. The cell contact making devices 12, 14, 16, 18 have at least one connecting element 20 (fig. 2) for electrically connecting the first battery element and the second battery element. The cell contact switch-on devices 12, 14, 16, 18 also have at least one safety element designed as a fuse for overvoltage protection.

It is provided that the connecting element 20 has a first cross-sectional area 22 (fig. 2) and a second cross-sectional area 24 (fig. 2) which is different from the first cross-sectional area 22, wherein the fuse is formed in the second cross-sectional area 24 and the second cross-sectional area 24 has a reduced cross-section relative to the first cross-sectional area 22.

Fig. 1 shows, in particular, that the cell contact making device forms two battery elements designed as individual cells 26 for connecting the energy store 10. This is shown in particular by the first battery cell contact-making means 12.

Furthermore, it may be provided that the cell contact making devices 12, 14, 16, 18 form two battery elements designed as a cell row 28 for connecting the energy accumulator 10. This is shown in particular by the second battery cell contact-making means 14.

Furthermore, it can be provided that the cell contact making devices 12, 14, 16, 18 form two battery elements of the accumulator 10, which are designed as cell rows 28, wherein a first cell row 26 is supported on a first side 30 of an intermediate pressure plate 32 of the accumulator 10 and a second cell row 26 is supported on a second side 34 of the intermediate pressure plate 32 opposite the first side 30. This is shown in particular by the third battery cell contact-making means 26.

Fig. 1 also shows that the cell contact-making devices 12, 14, 16, 18 form two battery elements designed as battery modules 36, 40 (fig. 3) for connecting the electrical storage device 10. This is shown in particular by the fourth cell contact making means 18.

Fig. 2 shows an embodiment of the connecting element 20 in a schematic plan view. In particular, in this exemplary embodiment, a first battery cell contact-making device 12 is shown. In other words, the cell contact making means 12 is designed to connect two individual cells 26, which are shown dashed.

Fig. 2 in particular shows that the second cross-sectional area 24 has at least one bore 38 for reducing the cross-section. In particular, in the present embodiment, the second cross-sectional area 24 has five holes 38. The holes 38 can be implemented, for example, as drilled holes. Alternatively or additionally, the second cross-sectional area 24 may have at least one gap or a plurality of gaps for reducing the cross-section. Alternatively or additionally, the second cross-sectional area 24 may have at least one web or a plurality of webs for reducing the cross-section.

In particular, it may additionally be provided that the second cross-sectional area may have a thickness of 2mm²To 10mm²In particular 5mm²And 8mm²The area in between.

Fig. 3 shows an embodiment of the cell contact making devices 12, 14, 16, 18 in a schematic sectional view. In particular, fig. 3 shows a fourth battery cell contact-making means 18. In particular, the fourth cell contact connection device 18 is designed to connect two cell modules 36, 40. The first battery module 36 is shown and the second battery module 40 is shown, in particular, only dashed.

First battery module 36 may be electrically and/or mechanically coupled to second battery module 40, for example, via threaded element 42. For this purpose, the fourth cell contact connection device 18 has, for example, a threaded sleeve 44 for a screw connection. Furthermore, the fourth battery cell contact connection device 18 has a contact surface 46 for electrical contact connection. In addition, it can be provided, in particular, that the fourth cell contact-making means 18 has a metal ring 48 as the second cross-sectional area 24. In order to reduce the cross section, a hole 50 can then be introduced, for example, into the metal ring 48, so that the electrical cross section can be reduced.

In particular, it is possible to realize that the contact surface 46 is not reduced by the fourth cell contact making means 18, so that the contact resistance is not reduced. Below the contact surface 46, the region for reducing the cross-section, in other words the second cross-sectional region 24, is in particular formed by a bore 50.

In particular, fig. 3 shows that fuses are implemented in the module connection interfaces. This can be achieved in the present exemplary embodiment, in particular, by a screw connection, wherein two metal rings, for example made of copper or aluminum, are pressed against one another. A cross-sectional reduction is introduced into the metal ring, which then acts as a fuse.

Fig. 1 to 3 show a cell contact making device 12, 14, 16, 18 comprising a fuse for an electrical storage device 10.

List of reference numerals

10 electric accumulator

12 first battery unit contact-making device

14 second battery unit contact-making device

16 third battery unit contact-making device

18 fourth battery unit contact-making device

20 connecting element

22 first cross-sectional area

24 second cross-sectional area

26 Single Battery cell

28 rows of cells

30 first side

32 intermediate press plate

34 second side

36 first battery module

38 holes

40 second battery module

42 screw element

44 threaded sleeve

46 contact surface

48 metal ring

50 drill hole