DE102018207327A1 - Storage device for storing electrical energy for a motor vehicle, and motor vehicle - Google Patents

Abstract

The invention relates to a storage device (1) for storing electrical energy for a motor vehicle, having a plurality of memory cells (2) arranged successively along a stacking direction (3) and forming at least one cell stack (4) for storing the electrical energy, with a second one End plates (8, 9) and at least two tensioning means (5) having at least two tension elements (10, 11) connected to the end plates (8, 9), by means of which the memory cells (16) arranged between the end plates (8, 9) along the stacking direction (3) 2) along the stacking direction (2) are clamped together and thereby held together, wherein the respective memory cell (2) at least two connection elements (6, 7), via which the respective stored in the respective memory cell (2) electrical energy from the respective memory cell (2) can be provided, and wherein the connection elements (6, 7) arranged laterally and with the respective tension elements (10, 11) are electrically connected, whereby the electrical energy stored in the cell stack (4) can be provided by the cell stack (4) via the pulling elements (10, 11).

Description

The invention relates to a storage device for storing electrical energy for a motor vehicle, in particular for a motor vehicle, according to the preamble of claim 1. Furthermore, the invention relates to a motor vehicle with at least one such storage device.

Such a storage device for storing electrical energy for a motor vehicle, in particular for a motor vehicle, for example, is already the DE 10 2014 218 330 A1 to be known as known. The memory device comprises a plurality of memory cells arranged successively along a stacking direction or arranged one behind the other and forming at least one cell stack for storing the electrical energy. The memory device can provide stored in the memory cells and thus in the cell stack stored electrical energy or electrical current. In particular, the storage device is used as a traction storage device, in particular as a traction battery, for example, to supply at least one electric machine for driving the motor vehicle with the electrical energy stored in the storage device. As a result, the electric machine can be operated, for example, as an electric motor, by means of which the motor vehicle can be electrically driven. The motor vehicle can thus be designed, for example, as a hybrid or electric vehicle. Since the motor vehicle can be driven by means of the electric machine, the electric machine is also referred to as a traction machine.

The storage device further comprises a tensioning device which has two end plates and at least two tension elements connected to the end plates. By means of the bracing means, that is, by means of the end plates and by means of the tension elements arranged along the stacking direction between the end plates memory cells along the stacking direction are clamped together and thereby held together. For this purpose, for example, the respective tension element along the stacking direction is tensioned or clamped, so that via the tension elements respective tensile forces are transmitted from one of the end plates to the other end plate or vice versa. The respective tensile force is a clamping force acting along the stacking direction, by means of which the end plates acting, for example, as pressure plates are pulled in the direction of or against the storage cells and thus tensioned. As a result, the memory cells are compressed and thus clamped together along the stacking direction. The respective tension element is or is loaded on train and is therefore also referred to as a tie rod. The respective memory cell has at least or exactly two connection elements via which the respective electrical energy stored in the respective memory cell can be provided by the respective memory cell. The respective connection element is also referred to as terminal, wherein the respective stored in the respective memory cell electrical energy can be removed from the respective memory cell via the terminal. Thus, for example, the electrical machine can be supplied via the respective connection elements with stored in the respective memory cell electrical energy.

In addition, the disclosed DE 10 2009 046 801 A1 a battery cell whose body has a base, a top surface and at least one side surface arranged at an angle to the base surface. In this case, the maximum extent of the base area is greater than the height defined by the side surface of the battery cell body, and the battery cell has the respective battery cell terminals associated terminals. In this case, the terminals are arranged on at least one side surface of the battery cell.

Object of the present invention is to develop a memory device and a motor vehicle of the type mentioned in such a way that a particularly advantageous structure of the memory device can be realized.

This object is achieved by a memory device with the features of claim 1 and by a motor vehicle having the features of claim 13. Advantageous embodiments of the invention are the subject of the dependent claims.

A first aspect of the invention relates to a storage device for storing electrical energy for a motor vehicle. The memory device has a plurality of memory cells arranged sequentially or successively along a stacking direction for storing the electrical energy, wherein the memory cells form at least one cell stack of the memory device. The memory device may provide the electrical energy stored in the memory cells. As a result, for example, at least one electrical machine for driving the motor vehicle can be supplied with the electrical energy stored in the memory device, in particular in the memory cells, whereby the electric machine can be operated, for example, in an engine operation and thus as an electric motor. As a result, for example, the motor vehicle, in particular as a passenger car, trained motor vehicle can be electrically driven, so that the motor vehicle for example, is designed as a hybrid or electric vehicle. The memory device is designed in particular as a high-voltage component, so that the memory device has or provides an electrical voltage, in particular an electrical operating voltage, which is greater than 50 volts, in particular greater than 60 volts. The electrical voltage, in particular the electrical operating voltage, of the storage device is preferably several hundred volts. As a result, large electrical power for the electrical driving of the motor vehicle can be realized. The memory device is designed, for example, as a battery, in particular as a high-voltage battery (HV battery), or the memory device is a component or a module of such a battery. In this case, the respective memory cell is designed, for example, as a battery cell, in particular as a lithium-ion cell.

The storage device further comprises at least one clamping device, which comprises two end plates and at least two tension elements connected to the end plates. By means of the tensioning device, the storage cells arranged along the stacking direction between the end plates are clamped together along the stacking direction and thereby held against one another. For this purpose, the respective tension element along the stacking direction is tensioned or braced, so that acts in or on the tension element, a tensile force along the stacking direction. This tensile force is transmitted via the respective tension element of one of the end plates on the other end plate or vice versa, so that the end plates also referred to as printing plates pulled by the tensile force acting as a clamping force along the stacking direction against or in the direction of the memory cells and thus stretched against the memory cells be or are. As a result, the memory cells arranged along the stacking direction between the plates are compressed along the stacking direction and thus held together. Since the bracing force acts as a tensile force for bracing the storage cells in the respective tension element, the tension element, in particular exclusively, is subjected to tension. Therefore, the respective tension element is also referred to as a tie rod.

The respective memory cell has at least or exactly two connection elements, which are also referred to as terminals. The respective memory cell can provide the respective electrical energy stored in the respective memory cells via the respective connection elements. In other words, for example, the electrical energy stored in the respective memory cell can be dissipated from the respective memory cell and, for example, supplied to the electrical machine via the respective connection elements.

In order to be able to realize a particularly advantageous construction of the memory device, which is particularly simple, and thus inexpensive, weight-saving and space-saving, it is provided according to the invention that the connection elements are arranged laterally and are electrically connected to the respective tension elements. As a result, the electrical energy stored in the cell stack can be provided via the pulling elements of the cell stack. In other words, the electrical energy stored in the storage cells of the cell stack can be provided by the pulling elements from the cell stack and thus removed from the cell stack. This provision of the electrical energy stored in the cell stack is also referred to as current tapping, wherein it is provided according to the invention that the current tapping takes place via the tension elements, which are also referred to as tie rods.

A first of the connection elements of the respective memory cell forms, for example, an electrical positive pole of the respective memory cell, wherein, for example, a second of the connection elements of the respective memory cell forms an electrical negative pole of the respective memory cell. In this case, for example, a first of the tension elements is electrically connected to the first connection elements of the cell stack, so that the first connection elements are electrically connected to one another via the first tension element. The second tension element is for example electrically connected to the second connection elements of the cell stack, so that the second connection elements of the cell stack are electrically connected to one another via the second tension element. As a result, the memory cells of the cell stack are electrically connected to one another, so that particularly large electrical powers can be realized for the electrical driving of the motor vehicle designed, for example, as a hybrid or electric vehicle. According to the invention, the tension elements are used for electrically connecting the connection elements and thus the memory cells, so that, for example, the use of a separate contacting system for electrically contacting the connection elements can be avoided. As a result, the number of parts and thus the cost, weight and space requirements of the storage device can be kept in a very small frame.

The invention is based in particular on the recognition that in conventional memory devices both the bracing device and a contacting system provided in addition to the bracing device are used, by means of which the current pick-up is carried out. This leads to a high number of parts and thus to high Cost, high weight and a high space requirement, which can now be avoided according to the invention. The bracing device according to the invention is at least a double function. In the context of the dual function, the tensioning device is used on the one hand to clamp the cell stack and thereby hold the memory cells together. On the other hand, the tensioning device is used for the power tap, so that a particularly advantageous and simple construction of the memory device as a whole can be represented.

In particular, the following can be understood as meaning the following: The respective memory cell has a cell housing, which has, for example, a receiving space or limits it. For example, electrodes and a, in particular liquid, electrolyte of the respective memory cell are accommodated in the receiving space. Along the stacking direction of the receiving space is limited for example by a front or a front wall and by a rear or a rear wall of the cell housing. In this case, the stacking direction coincides, for example, with a first direction or with a first spatial direction, so that the receiving space is delimited along the first direction by the front wall or by the front side and by the rear side or by the rear side of the cell housing. Along a second direction extending perpendicularly to the first direction, the receiving space is bounded, for example, by side surfaces or side walls of the cell housing. The front wall and the rear wall and the front side and the rear side are spaced apart along the first direction, wherein the side surfaces or side walls are spaced apart along the second direction. Along a direction perpendicular to the first direction and perpendicular to the second direction extending third direction of the receiving space is limited, for example, by an upper wall, top side or top wall called upper wall and by an underside, base or base wall called bottom wall of the cell housing. In the installation position of the storage device, the third direction coincides with the vehicle vertical direction, the storage device assuming its installed position in the completely produced state of the motor vehicle. In this case, the top wall and the bottom wall are spaced apart along the third direction. The lateral arrangement of the connection elements is to be understood that the connection elements are arranged neither on the front nor on the back and also not on the top or on the bottom, but the connection elements are arranged on the side walls or side surfaces. In this case, for example, the first connection element is arranged on or on a first of the side walls or side surfaces, wherein the second connection element is arranged, for example, on or on the second side wall or side surface opposite the first side wall or side surface. In this way, a particularly simple and space-saving electrical contacting of the terminal elements, which are also referred to as terminals, can be realized. In particular, the aforementioned double function of the bracing device can be realized in a particularly simple and cost-effective manner.

It has proven to be particularly advantageous if the respective connection elements of the respective memory cell are arranged on mutually remote sides of the respective memory cell. Here, for example, the first connection element is arranged on or on the first side surface or side wall, while the second connection element is arranged on or on the second side wall or side surface. In this case, for example, the first pulling element is arranged on a first of the sides, and the second pulling element is arranged on the second side facing away from the first side. On the one hand, this makes it possible to realize the current tapping in a particularly advantageous and space-saving manner. On the other hand, the memory cells can thereby be braced particularly well with each other and thus held together, so that the space requirement of the memory device can be kept in a very small frame.

In order to be able to realize a particularly advantageous and particularly space-saving and cost-effective design of the storage device, it is provided in a further embodiment of the invention that the respective cell housing has at least one filling opening, via which electrolyte is filled into the respective cell housing and thus into the respective receiving space can. In this case, the filling opening is arranged on or at the top, which points in the installed position of the storage device in the vehicle vertical direction upwards.

In a particularly advantageous embodiment of the invention, the respective cell housing on a bursting membrane, which is preferably arranged on the top. This allows a particularly compact design can be realized. The bursting membrane closes a corresponding passage opening of the cell housing designed as a vent opening and bursts when a pressure prevailing in the receiving space exceeds a threshold value. As a result, the bursting membrane releases the vent at least partially, so that a fluid is released via the vent Vent can flow out of the receiving space. As a result, the cell housing, in particular controlled, vented.

The respective cell housing itself has, for example, at least one passage opening, which is closed by means of the bursting membrane. Thus, preferably, the passage opening is arranged on or at the top. If, for example, as a result of an accident of the motor vehicle, a so-called thermal event occurs in the respective memory cell, so-called outgassing of the electrolyte can occur. The outgassing is a thermal, that is caused by heat event, in the context of at least a portion of the electrolyte, a fluid, in particular a gaseous fluid is formed. As the amount of fluid in the receiving space increases, for example, an internal pressure prevailing in the receiving space and thus in the cell housing increases. If the internal pressure exceeds a predefinable threshold value, the membrane bursts, as a result of which the membrane at least partially releases the passage opening. As a result, the fluid can flow out of the cell housing through the released passage opening, so that the respective cell housing or the respective receiving space can be vented by means of the passage opening and the bursting membrane. As a result, unwanted further effects can be avoided. The arrangement of the bursting membrane on the upper side has proven to be particularly advantageous in order to be able to realize a particularly secure and thus advantageous construction of the storage device.

In a further embodiment of the invention, the cell housing on exactly three in each case in one piece and separately formed and interconnected housing parts. As a result, the cell housing can be produced particularly simply and thus inexpensively.

In order to keep the number of parts and thus the costs particularly low, it is provided in a further embodiment of the invention that the cell housing has exactly two each integrally and separately formed and interconnected housing parts, which are designed as shell elements. Thus, a first of the shell members defines a first portion of the receiving space, wherein the second shell member defines a second portion of the receiving space. By simple and inexpensive assembly or assembly of the shell elements, the cell housing and thus the receiving space can be formed.

In order to be able to produce the memory device particularly time-consuming and cost-effective, it is provided in a further embodiment of the invention that the shell elements are assembled in a parting plane in which runs the stacking direction. Thus, for example, the previously described second direction runs in the parting plane.

In order to keep the cost of the memory device particularly low and thus to realize a particularly simple structure, it is provided in a further embodiment of the invention that the housing parts are materially interconnected, in particular welded together, are.

In a particularly advantageous embodiment of the invention, the cell housing has a first extension running along the first direction coinciding with the stacking direction, a second extension running along the second direction, and a third extension running along the third direction. In this case, the second extent and the third extent are each greater than the first extent, wherein preferably the second extent is greater than the third extent.

It has been found to be particularly advantageous if the cell housing on the outer circumference side prismatic, in particular cuboid, is formed. In particular, for example, the respective side surface is a base surface, which is rectangular and thereby has a Reckeckform different from a square. By parallel displacement of the respective side surface along the second direction of the cuboid cell housing is formed, so that a particularly advantageous and compact space can be displayed. At the same time, a particularly high energy density or a high energy content can be realized.

Finally, it has proven to be particularly advantageous if the respective tension element is formed from a light metal, in particular aluminum. As a result, the weight of the storage device can be kept particularly low. At the same time a particularly advantageous electrical conductivity of the respective tension element can be realized, so that an advantageous current pick-up can be made possible.

• 1 eine schematische Perspektivansicht einer erfindungsgemäßen Speichereinrichtung zum Speichern von elektrischer Energie für ein Kraftfah rzeug;
• 2 eine schematische Perspektivansicht einer Speicherzelle der Speichereinrichtung gemäß einer ersten Ausführungsform; und
• 3 eine schematische Perspektivansicht der Speicherzelle gemäß einer zweiten Ausführungsform

Further details of the invention will become apparent from the following description of preferred embodiments with the accompanying drawings. Showing:

• 1 a schematic perspective view of a storage device according to the invention for storing electrical energy for a Kraftfah rzeug;
• 2 a schematic perspective view of a memory cell of the memory device according to a first embodiment; and
• 3 a schematic perspective view of the memory cell according to a second embodiment

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

1 shows a schematic perspective view of a storage device 1 for storing electrical energy for a motor vehicle, which is designed for example as a motor vehicle and preferably as a passenger car. The motor vehicle is designed as a hybrid or electric vehicle and comprises at least one electric machine, by means of which the motor vehicle can be electrically driven. Therefore, the electric machine is also referred to as a traction machine. The storage device 1 includes several memory cells 2 , which along a in 1 by a double arrow 3 illustrated stacking direction are arranged successively and one behind the other and a cell stack 4 form. By means of or in the respective memory cell 2 Electric energy can be stored. The memory cells 2 are respective single cells or are also referred to as single cells, since the memory cells 2 are separate from each other and in themselves individual or loose components. The storage device 1 includes a clamping device, also referred to as frame or cell frame 5 , by means of which the memory cells 2 clamped together along the stacking direction and thereby held together.

The storage device 1 can be in the memory cells 2 Provide stored electrical energy, so that, for example, the electric machine with in the storage device 1 stored electrical energy can be supplied. As a result, the electric machine can be operated in an engine operation and thus as an electric motor, by means of which the motor vehicle is electrically drivable. Furthermore, it is conceivable that the electric machine is operable in a generator mode and thus as a generator. In the generator mode, the electric machine is driven, for example, by at least one wheel of the moving motor vehicle and thus by kinetic energy of the motor vehicle. By means of the generator at least a part of the kinetic energy of the motor vehicle is converted into electrical energy, which is provided by the generator. The electrical energy provided by the generator may be, for example, the storage device 1 and in particular the memory cells 2 supplied and in the memory cells 2 get saved.

The storage device 1 is preferably a high-voltage component, which has or provides an electrical voltage, in particular an electrical operating voltage. The electrical voltage, in particular the electrical operating voltage, is greater than 50 volts, in particular greater than 60 volts. Preferably, the electrical voltage is several 100 volts. As a result, large electrical power for the electrical driving of the motor vehicle can be realized.

2 shows in a schematic perspective view one of the memory cells 2 according to a first embodiment of the memory device 1 , Like from a synopsis of 1 and 2 is recognizable, has the respective memory cell 2 at least or exactly two connection elements 6 and 7 on, which are also referred to as terminals. About the respective connection elements 6 and 7 can the respective memory cell 2 provide the electrical energy stored in it, so via the connecting elements 6 and 7 in the respective memory cell 2 stored electrical energy from the respective memory cell 2 can be dissipated. Furthermore, it is conceivable that the electrical energy provided by the generator via the respective connection elements 6 and 7 into the respective memory cell 2 introduced and thus in the respective memory cell 2 can be stored. The storage device 1 is in particular designed as a high-voltage battery (HV battery), so that, for example, the respective memory cell 2 is formed as a respective battery cell. In particular, the memory device 1 be designed as a lithium-ion battery, so that the respective memory cell 2 for example, is designed as a lithium-ion cell. The respective memory cell 2 is also referred to as a battery cell.

The tensioning device 5 comprises at least or exactly two end plates, also referred to as printing plates 8th and 9 , wherein the memory cells 2 of the cell stack 4 along the stacking direction (double arrow 3 ) between the end plates 8th and 9 are arranged. In addition, the clamping device includes 5 a first tension element in the form of a first tie rod 10 and a second tension member in the form of a second tie rod 11 , The tie rods 10 and 11 are with the respective end plates 8th and 9 connected and stretched along the stacking direction, so that in the tie rods 10 and 11 in each case at least one pulling force running along the stacking direction acts. The respective tensile force is over the respective tie rod 10 respectively 11 from one of the end plates 8th and 9 on the other end plate 9 respectively 6 transferred or vice versa, so that the end plates 8th and 9 by means of the respective tensile force acting as a tensioning force against the cell stack 4 are curious or be curious. The in the tie rods 10 and 11 acting tensile force acts on the end plates 8th and 9 as a pressure force on the memory cells 2 , which are compressed by the compressive force along the stacking direction and thereby held together and clamped together or will be. Therefore, the endplates become 8th and 9 also referred to as printing plates.

Now to a particularly advantageous and particularly simple construction of the memory device 1 to be able to realize, are the connection elements 6 and 7 arranged laterally and with the respective tension elements (tie rods 10 and 11 ), whereby the cells in the cell stack 4 stored electrical energy via the tie rods 10 and 11 from the cell stack 4 is available.

Especially good 2 it can be seen that the respective memory cell 2 a cell case 12 having. The cell case 12 limits a respective recording room 13 the respective memory cell 2 , In the respective recording room 13 are respective electrodes and a respective, in particular liquid, electrolyte of the respective memory cell 2 added. The electrodes are, for example, in particular about a winding axis, to a so-called electrode winding 14 wound or rolled up, the electrode winding 14 Also simply referred to as a roll and in the recording room 13 is included. The electrode winding 14 comprises the electrodes and preferably at least one separator arranged between the electrodes, which with the electrodes leads to the electrode winding 14 is wound up. The electrode winding 14 is also referred to as an electrode winding, winding or jelly-roll winding, since the jelly-roll winding is an electrode winding, which is rolled up or wound up in the manner of a sponge roll. Such a sponge roll is referred to in English as a jelly roll, so for example, the electrode winding 14 has a sponge roll structure. As a result, the electrode winding 14 is wound or rolled up in the manner of a sponge roll, the jelly-roll winding on two along the stacking direction opposite broad sides.
Along the stacking direction is the receiving space 13 by a front wall, also referred to as front surface or front side 15 and by a rear wall, also referred to as the rear or rear surface 16 of the cell housing 12 limited. The stacking direction coincides with a first direction or is a first direction.

Along a in 1 by a double arrow 17 illustrated and perpendicular to the first direction and thus to the stacking direction extending second direction is or is the receiving space 13 by also referred to as side surfaces sidewalls 18 and 19 of the cell housing 12 limited. At the in 2 illustrated first embodiment, the side walls 18 and 19 For example, formed by cover, which are preferably integrally formed. Preferably, the side walls 18 and 19 formed of a metallic material. The front wall 15 and the back wall 16 are formed for example of a metallic material and in turn formed in one piece. In particular, the front wall can 15 and the back wall 16 be integrally formed with each other. Along a plane perpendicular to the first direction and perpendicular to the second direction and in 1 by a double arrow 20 illustrated third direction is or is the receiving space 13 through a top or through a top wall 21 and by a bottom or by a sub-wall 22 of the cell housing 12 limited. Thus, the side walls 18 and 19 spaced apart along the second direction while the top wall 21 and the lower wall 22 spaced apart along the third direction. The front wall 15 and the back wall 16 are spaced apart along the first direction or along the stacking direction. For example, the top wall 21 and the lower wall 22 made of a metallic material and / or in one piece. This can be the top wall 21 and the lower wall 22 integral with each other and / or integral with the front wall 15 and the back wall 16 be educated.

In installation position of the storage device 1 falls through the double arrow 20 illustrated third direction with the vehicle vertical direction of the motor vehicle together, wherein the vehicle vertical direction is also referred to as the z-direction. This takes the storage device 1 its installation position in the fully manufactured state of the motor vehicle, which in its fully manufactured state, the storage device 1 and the electric machine comprises. Under the feature that the connection elements 6 and 7 are arranged laterally, is thus to be understood that the connection elements 6 and 7 on or on the side walls 18 and 19 and thus on opposite sides along the second direction or away from each other 27 and 28 of the cell housing 12 are arranged.

The example also referred to as the first connection element connection element 6 forms, for example, an electrical positive pole of the respective memory cell 2 while, for example, also referred to as the second connection element connecting element 7 an electrical negative terminal of the respective memory cell 2 forms. The connection element 6 and thus the positive pole are, for example, on or on the side wall 18 arranged while the connecting element 7 and thus the negative electrical pole, for example, on or on the side wall 19 are arranged. For example, the connection element 6 integral with the side wall 18 formed, or the connection element 6 and the side wall 18 are separately formed and interconnected components, for example, the connection element 6 against the side wall 18 is electrically isolated. This can also affect the connection element 7 and the side wall 19 be transmitted. Thus, it is conceivable that connecting element 7 integral with the side wall 19 is formed, or the connection element 7 and the side wall 19 are separately formed and interconnected components, which may for example be electrically isolated from each other. In particular, it is conceivable that the respective separately formed components are connected to one another in a material-locking manner, in particular welded together. In particular, thus, the respective, separately from the top wall 21 , the lower wall 22 , the front wall 15 and the back wall 16 trained and also referred to as a lid side wall 18 respectively 19 cohesively with the top wall 21 , the lower wall 22 , the front wall 15 and the back wall 16 connected, in particular with the top wall 21 , the lower wall 22 , the front wall 15 and the back wall 16 welded, be.

To do this, the number of parts and thus the weight, the space requirement and the cost of the storage device 1 To keep particularly low and thus a particularly advantageous structure of the memory device 1 To allow it, it is further provided that the tie rod 10 on the side wall 18 arranged and thereby with the connection elements 6 of the cell stack 4 electrically connected. The tie rod 11 is on the side of the respective connection element 7 arranged and thereby with the connection elements 7 of the cell stack 4 electrically connected. Thus, the tie rods 10 and 11 arranged on sides facing away from each other along the second direction or opposite, so that the tie rods 10 and 11 lateral tie rods are. The tie rods 10 and 11 become on the one hand for clamping the cell stack 4 and on the other hand, used for power tapping, since the fact that the tie rod 10 with the connection elements 6 and the tie rod 11 with the connection elements 7 electrically connected in the cell stack 4 stored electrical energy from the cell stack 4 over the tie rods 10 and 11 can be provided. Expressed again in other words are the tie rods 10 and 11 as a guide element for guiding the electrical energy from the memory cells 2 used to the electric machine or vice versa. Contact the tie rods 10 and 11 the connection elements 6 and 7 laterally directly, so that in particular the space requirement along the third direction can be kept particularly low.

Because of the tie rods 10 and 11 used for power tapping, a separate, additional Zellkontaktierungssystem can be avoided, so that a particularly simple structure of the storage device 1 can be represented. To the weight of the storage device 1 To keep particularly low while a favorable electrical conductivity of the tie rods 10 and 11 To realize, it is preferably provided that the v tie rods 10 and 11 are designed as aluminum tie rods, so that the tie rods 10 and 11 may be formed of aluminum.

At the in 2 illustrated first embodiment comprises the cell housing 12 preferably exactly four components, which are each formed in one piece. The components are formed separately from each other and connected to each other. A first of the components is a one-piece body 23 , which, for example, the sub-wall 22 , the front wall 15 and the back wall 16 forms. The main body 23 is formed for example of a metallic material or of a plastic. A second of the components is a one-piece lid 24 which is the top wall 21 forms.

The lid 24 is thus also referred to as upper cover. A third of the components is a first side cover 25 , which is integrally formed and the side wall 18 forms. The fourth component is a second side cover 26 , which is integrally formed and the side wall 19 forms. The respective lid 25 respectively 26 is for example with the main body 23 and with the lid 24 connected, in particular materially connected or welded, for example. As the connecting element 6 on or on the side wall 18 and the connection element 7 on or on the side wall 19 is arranged, are the connection elements 6 and 7 on the opposite sides along the second direction 27 and 28 the respective memory cell 2 arranged so that also the tie rods 10 and 11 on the opposite sides 27 and 28 are arranged. The respective cell housing 12 has at least or exactly one filling opening 29 on, about which electrolyte in the receiving space 13 and thus into the cell housing 12 can be filled. Here is the filling opening 29 on the upper wall 21 and on a relation to the installation position in the vehicle vertical direction upwardly facing top 30 of the cell housing 12 arranged. The respective lid 24 . 25 and or 26 may be formed of a metallic material or of a plastic. The front wall, 15, the rear wall 16 , the upper wall 21 , the lower wall 22 , the basic body 23 , the side wall 18 and / or the side wall 19 may be formed of a metallic material or of a plastic.

Furthermore, the respective cell housing 12 at least or exactly one passage opening 31 and a bursting membrane 32 on which in the passage opening 31 is arranged. As a result, the passage opening 31 by means of the bursting membrane 32 locked. It is also the bursting membrane 32 on the upper wall 21 and thus on the top 30 arranged. Overall, it can be seen that the main body 23 , the lid 24 and the lids 25 and 26 respective, each integrally formed and separately formed housing parts are, which are interconnected. In particular, the housing parts are welded together to form respective welds and thereby materially connected to each other.

3 shows a second embodiment. In the second embodiment, the cell housing 12 exactly two housing parts in the form of shell elements 33 and 34 on, which in the present case are designed as half-shells. The shell element 33 limits a first part and thereby a first half of the receiving space 13 while the shell element 34 a second part and the second half of the recording room 13 limited. The shell elements 33 and 34 are in a dividing plane 35 composed, wherein the parting plane 35 perpendicular to the third direction. In particular, the shell elements 33 and 34 forming at least one weld in the parting plane 35 welded together and thereby materially connected together.

To the cell case 12 assemble, the shell elements 33 and 34 along the third direction merged and assembled and then joined together by means of at least or exactly one weld. Also in the second embodiment, the connection elements 6 and 7 arranged laterally. In particular, the shell elements 33 and 34 assembled bluntly and thus assembled along a butt joint and welded together.

As can be seen from the figures, the respective cell housing 12 outside circumference prismatic, in particular cuboid shaped. In this case, the cell housing 12 a longitudinal extent, which runs along the second direction. In other words, the cell case 12 has a first extent extending along the first direction, a second extent extending along the second direction, and a third extent extending along the third direction. The second extent and the third extent are each greater than the first extent, wherein preferably the second extent is greater than the third extent. The cell case 12 is thus formed flat, in particular along the first direction.

LIST OF REFERENCE NUMBERS

1

memory device

2

memory cell

3

double arrow

4

cell stack

5

tensioning device

6

connecting element

7

connecting element

8th

endplate

9

endplate

10

tie rods

11

tie rods

12

cell case

13

accommodation space

14

electrode winding

15

front wall

16

rear wall

17

double arrow

18

Side wall

19

Side wall

20

double arrow

21

upper wall

22

under wall

23

body

24

cover

25

cover

26

cover

27

page

28

page

29

fill opening

30

top

31

Through opening

32

bursting membrane

33

shell element

34

shell element

35

parting plane

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 102014218330 A1 [0002]
• DE 102009046801 A1 [0004]

Claims (13)

A memory device (1) for storing electrical energy for a motor vehicle, comprising a plurality of memory cells (2) arranged successively along a stacking direction (3) and forming at least one cell stack (4) for storing the electrical energy, comprising a pair of end plates (8, 9) and at least two tensioning devices (5) having tension elements (10, 11) connected to the end plates (8, 9), by means of which the memory cells (2) arranged along the stacking direction (3) between the end plates (8, 9) are arranged along the Stacking direction (2) clamped together and thereby held together, wherein the respective memory cell (2) has at least two connection elements (6, 7) via which the respective stored in the respective memory cell (2) electrical energy from the respective memory cell (2 ) can be provided, characterized in that the connection elements (6, 7) arranged laterally and with the respective tension elements (10, 11) are electrically connected, whereby in the cell stack (4) stored electrical energy via the tension elements (10, 11) of the cell stack (4) can be provided. Storage device (1) according to Claim 1 , characterized in that the respective connection elements (6, 7) of the respective memory cell (2) on opposite sides (27, 28) of the respective memory cell (2) are arranged, wherein a first of the tension elements (10, 11) on a first the sides (27, 28) and the second tension element (11) on the first side (27) facing away from the second side (28) is arranged. Storage device (1) according to Claim 1 or 2 , characterized in that the respective memory cell (2) has a cell housing (12) in which electrodes (14) and an electrolyte of the respective memory cell (2) are accommodated, wherein the cell housing (12) has an installation position of the memory device (1). Having in the vehicle vertical direction upwardly facing top (30). Storage device (1) according to Claim 3 , characterized in that the respective cell housing (12) has at least one filling opening (29), via which electrolyte in the respective cell housing (2) can be filled, wherein the filling opening (29) on the upper side (30) is arranged. Storage device (1) according to Claim 3 or 4 , characterized in that the respective cell housing (12) has a bursting membrane (32), which is arranged on the upper side (30). Storage device (1) according to one of Claims 3 to 5 , characterized in that the cell housing (12) has exactly three in each case integrally and separately formed and interconnected housing parts (23, 24, 25, 26). Storage device (1) according to one of Claims 3 to 5 , characterized in that the cell housing (12) has exactly two in each case integrally and separately formed and interconnected housing parts (33, 34) which are formed as shell elements (33, 34). Storage device (1) according to Claim 7 , characterized in that the housing parts (23, 24, 25, 26, 33, 34) in a parting plane (35) are composed, in which the stacking direction (3) extends. Storage device (1) according to one of Claims 6 to 8th , characterized in that the housing parts (23, 24, 25, 26, 33, 34) integrally connected to one another, in particular welded together, are. Storage device (1) according to one of Claims 3 to 9 , Characterized in that the cell housing (12) extending along a coincides with the stacking direction (3) first means (3) first extension, one along a direction perpendicular to the first direction the second direction (17) extending second extension and a vertically along a to the first direction (3) and perpendicular to the second direction (17) extending third direction (20) extending third extent, wherein the second extent and the third extent are each greater than the first extent. Storage device (1) according to one of Claims 3 to 10 , characterized in that the cell housing (12) on the outer peripheral side prismatic, in particular cuboid, is formed. Memory device (1) according to one of the preceding claims, characterized in that the respective tension element (10, 11) is formed from a light metal, in particular aluminum. Motor vehicle, with at least one storage device (1) according to one of the preceding claims.

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