DE102012007317A1 - Device for fastening battery module in battery box of motor car, has clamping unit whose head part is designed as clamping lever that is pivoted into clamping position and attached with lever arm at lever nose of clamping element - Google Patents

Abstract

The device has a clamping unit (9) including a head part (31) and a base part i.e. integral part of a battery box, at module sides (8) that lie opposite to each other. The head part and the base part are connected with each other by a clamping element, where the head part is adjusted in a clamping position, in which a battery module (3) is braced between the head part and the base part. The head part of the clamping unit is designed as a clamping lever that is pivoted in the clamping position and attached with a lever arm at a lever nose of the clamping unit.

Description

The invention relates to a device for attaching at least one battery module in a battery case of a traction battery of an electrically operated motor vehicle according to the preamble of claim 1.

The traction battery of an electrically powered vehicle has battery cells, which are combined in several box-shaped battery modules. The battery modules are in turn provided in a, for example, arranged below a rear seat of a vehicle battery box.

From the EP 1 548 850 A1 a generic device for mounting battery modules in a battery box of a motor vehicle is known. Each of these battery modules is attached by means of a clamping unit on the vehicle body. The clamping unit has at each of the outer corner regions of the battery module each bolt, which are clamped on the bottom side and the upper side by means of nuts on the vehicle body. In this case, a total of four bolts are provided at each outer corner of the battery module space consuming. The clamping units built up by bolts and screw nuts are technically complex to mount and require a large amount of space. In this way, a correspondingly large height of the arrangement results.

The object of the invention is to provide a device for fastening at least one battery module in a battery box of a motor vehicle, in which the battery module is easy to assemble mounting technology and with reduced space requirements in the battery box or on the vehicle body.

The object is solved by the features of claim 1. Preferred expansions of the invention are disclosed in the subclaims.

The fastening device according to the invention also has on opposite battery module sides in each case a head part and a base part, which are interconnected via a clamping element. According to the characterizing part of claim 1, however, the head and base parts are not connected in a screw connection with the clamping element. Rather, at least the head part is designed as a, pivotable into a clamping position clamping lever, which is attachable with its one lever arm to a corresponding lever neck of the clamping element. Accordingly, the head part can be brought into its clamping position via a lever mechanism, in which the head and base parts exert opposing clamping forces on the battery module arranged therebetween. The base part opposite the base part is preferably of the same material and / or integrally connected to the foot side of the tensioning element, in particular by a welded connection. The clamping element according to the invention is therefore not a bolt, but rather may be a raised with respect to the base member bar or a flat profile. By such a connection in particular height is saved, which is otherwise required due to a space-consuming screw connection.

The lever lug of the clamping element may for example be a U-shaped recess in which a lever arm of the clamping lever can be hooked.

The tensioning lever can be designed with two arms with the above-mentioned lever arm and with a second, opposite with respect to the lever pivot axis lever arm. The clamping lever can be moved by pivoting about its lever pivot axis in the clamping position. To secure the clamping lever in the clamping position, the second lever arm can be fixed by a latching connection or by a screw connection.

The clamping lever can preferably not be supported directly on the module side, but with the interposition of a clamping carrier. The tension support evenens the tension forces applied to the battery module via the tension lever. Preferably, the clamping beam may be strip-shaped and extend along an edge of the battery module. In adjacent battery modules, the clamping carrier can each cover the facing battery module marginal edges.

In a preferred embodiment, the battery module can be constructed box-shaped from battery cells. These may extend between two opposite end faces, such as aluminum printing plates. The printing plates are preferably lightweight metal hollow sections, such as extruded sections, which are cut to length. Such hollow profile parts are already interspersed with continuous channels. These can also be used as feedthroughs for the clamping elements in a double function.

Depending on the available space, the battery modules can be arranged in at least one row one behind the other, each with adjoining end walls. Additionally or alternatively, the battery modules can also be stacked one above the other in the vehicle vertical direction. The thus arranged battery modules can by means of Device according to the invention are securely fixed to the vehicle body.

In a preferred embodiment, the tensioning element can be made in two parts with a lower strip part and an upper strip part which extends the lower strip part in the stacking direction. The upper rail part may be coupled to one end on the lower rail part. Whose other end may be carried out with the lever approach to which the clamping lever according to the invention can be attached. Preferably, the two strip parts of the clamping bar can be coupled in releasable latching connection.

Preferably, the battery modules are not stacked directly on top of one another in the stacking direction, but rather are arranged one above the other with the interposition of a spacer. In this way, a uniform load distribution of the upper battery modules can be done. Preferably, the spacer may also be made strip-shaped and cover the marginal edges of adjacent battery modules, which are arranged in series. Preferably, the spacer and also the already mentioned tensioning beam can each be embodied as a strip which has a wave profile in order to achieve a defined introduction of force into the battery modules.

The base part, the clamping carrier and / or the spacers may have centering elements which can protrude into corresponding centering openings of the battery modules. The centering elements are preferably centering mandrels, which are fixed locally separated from the clamping element on, for example, the base part.

The base part with the clamping element preferably fixedly connected thereto may be an integral part of the battery box bottom. In this way, the battery modules can be firmly clamped to the battery case bottom.

The advantageous embodiments and / or further developments of the invention explained above and / or reproduced in the subclaims can be used individually or else in any desired combination with one another, except, for example, in the case of clear dependencies or incompatible alternatives.

The invention and its advantageous embodiments and further developments and advantages thereof are explained in more detail below with reference to drawings.

Show it:

1 in a perspective view of a battery case of a traction battery for a vehicle, in which the upper shell of the battery box is removed and the battery modules are exposed;

2 in an enlarged detail view of two adjacent battery modules, which are attached via a clamping unit to the lower shell of the battery box;

3 an enlarged sectional view along the sectional plane AA from the 1 ;

5 an enlarged sectional view, illustrating the assembly of the traction battery is illustrated;

6 in perspective view and in isolation a strip-shaped base part with clamping elements and positioning pins; and

7 to 9 Views illustrating the assembly of the clamping elements.

In the 1 a traction battery for an electrically operated vehicle is shown, which may be arranged in the installed position in the vehicle, for example, below a rear seat. The traction battery has a battery box with a in the 1 omitted upper shell and a lower shell 1 on. In the lower shell 1 of the battery box are several battery modules 3 arranged. In the 1 are the battery modules 3 indicated as cuboidal components. These each have lateral aluminum pressure plates in the vehicle transverse direction y 5 ( 2 ), between which in the 2 indicated battery cells 7 extend. The frontal printing plates 5 serve to stiffen the battery modules 3 , In addition, the printing plates 5 cut here by way of example from an extruded hollow section with a predetermined length, each of the height of the battery modules 3 equivalent. The cut edges 6 ( 2 ) designed as hollow profiles printing plates 5 show each in the vertical direction z upwards and downwards, so that the hollow profile channels described later 35 ( 3 and 4 ) of the printing plates 5 vertically in the vertical direction z run.

In the 1 are the battery modules 3 in the vehicle transverse direction y in succession in two rows of modules I, II arranged such that the pressure plates 5 the juxtaposed battery modules 3 facing each other. In each of the module rows I, II are respectively upper and lower, identical constructed battery modules 3 stacked. The printing plates 5 of stacked battery modules 3 are arranged vertically in flight.

In addition, in the 1 on the upper module side 8th the transition edges running in the vehicle longitudinal direction x 10 ( 1 and 2 ) such as the laterally outer edges 12 with clamping beam strips 47 covered in order to achieve a uniform load distribution along the edge profiles. These are part of clamping units 9 , by means of the battery modules 3 secure in position by applying tension forces F _{S to} the ground 11 ( 3 ) of the lower shell 1 are tense.

The structure of one of the clamping units 9 is below on the basis of 3 and 4 described: This is how the clamping unit points 9 according to the 3 . 4 and 6 a base bar 13 on, acting as a metal flat profile on the ground 11 the lower shell 1 is attached. At the upper flat side 14 the base bar 13 is according to the 3 a clamping bar 15 molded, the foot side by a welded joint 17 ( 3 ) with the horizontal base bar 13 are connected. The clamping bar 15 is through a hollow profile channel 35 the frontal battery module pressure wall 5 the two stacked, upper and lower battery modules 3 guided. Moreover, in the 3 on the upper flat side 14 the base bar 13 an upwardly projecting positioning pin 33 provided, which also in a corresponding hollow profile channel 35 protrudes.

The clamping bar 15 is in the 3 two-piece with a lower strip part 16 and a top rail part 18 executed, which has a later described connection profile 19 connected to each other in a force-transmitting manner. The assembly of the lower and upper strip parts 16 and 18 the clamping bar 15 is later based on the 7 to 9 described.

The upper end of the clamping bar 15 surmounted according to the 3 the upper module side 8th the battery modules 3 and is with a hook-shaped lever approach 27 with a U-shaped recess 29 educated. In the in the 3 shown clamping position is the lever approach 27 the clamping bar 15 in operative connection with a tensioning lever 31 , As a result, a first lever arm 43 of the two-armed clamping lever 31 around a lever pivot axis 51 pivoted upwards in the counterclockwise direction and into the U-shaped recess 29 the lever approach 27 hooked. The with respect to the lever pivot axis 51 the first lever arm 43 opposite second lever arm 45 is in the 3 pivoted counterclockwise downwards and in plant and in screw connection 49 with the tension bar 47 is. The lever pivot axis 51 is according to the 3 through one at the bottom of the clamping lever 31 provided projection provided on the strip-shaped clamping beam 47 rests.

In the, in the 1 and 2 shown clamping position of the clamping lever 31 are thus on the head-side clamping beam strips 47 as well as the foot-side base bars 13 each mutually opposite clamping forces F _s on.

When installing the battery modules 3 in the battery box are first according to the 5 the battery modules 3 in the lower shell 1 used in the battery box. It is in accordance with the 5 the upright lower strip part 16 the clamping bar 15 through a hollow profile channel 35 the printing plate 5 of the battery module 3 guided. At the same time the positioning pin 33 into a corresponding channel 35 the printing plate 5 retracted. Subsequently, a spacer bar 57 ( 3 and 4 ) on the marginal edges of the lower battery modules 3 For uniform load distribution between the stacked battery modules 3 provides. The spacer strips 57 also have upwardly and downwardly projecting positioning pins 33 on top of the stacked battery modules 3 align in flight. Subsequently, in a further assembly step, the lower strip parts 16 with the upper rail parts 18 coupled and subsequently the upper battery module 3 piled up. This is the upper part of the strip 18 the clamping bar 15 through the corresponding channel 35 of the upper battery module 3 guided.

To exercise the clamping forces F _S then the clamping beam strips 47 on the upper module side 8th Loosely applied and the tension levers 31 loose in approach with the U-shaped recesses 29 the lever approaches 27 the upper last parts 18 brought. The tension carrier bars 47 and the spacer strips 57 are not designed as consistently flat profiles, but rather each carried out with a wave profile to the predefined pressure points, the clamping forces F _s as evenly as possible in the battery modules 3 to distribute.

Like from the 6 shows, the base bar carries 13 a total of four tension bars 15 , which are each arranged to two clamping strip pairs. Corresponding are also the total of eight positioning pins 33 in pairs on the base bar 13 arranged. In every pair of tension bars 15 / positioning 33 the clamping bars / positioning pins are spaced such that there is a free vertical transition gap 36 ( 4 ) between juxtaposed battery modules 3 results. In addition, the spacer strips are also 57 dimensioned so that the stacked battery modules 3 are not directly adjacent to each other but over a free horizontal transition column 37 ( 4 ) are spaced from each other. The horizontal transition column 37 are sized so that sufficient space for the connection profiles 19 the clamping bars 15 is provided.

Based on 7 to 9 is the assembly of a clamping bar 15 described. So has the connection profile 19 of the two paired lower last parts 16 the clamping bars 15 each a keyhole-like detent opening 59 with an upper circular opening area 61 and a subsequent downward rectangular opening area 63 on. In the circular opening area 61 the latch opening 59 opens an inclined insertion channel 65 , The likewise arranged in pairs upper parts of the strip 18 are with a crossbar 23 connected, the component of the connection profile 19 is. The crossbar 23 is flattened laterally, with its flat sides parallel to the longitudinal edges of the two upper strip parts 18 run. The contour of the crosspiece 23 is designed to be in an inclined position ( 7 ) through the insertion area 65 in the detent opening 59 is insertable. The crossbar 23 can subsequently along with the upper strip parts 18 be turned into a vertical upright position ( 8th ). Subsequently, the upper strip parts can 18 together with the crossbar 23 due to the weight force in a form-fitting manner in the narrow, rectangular opening portion 63 the latch opening 53 drive in ( 9 ). When applying a clamping force of the crossbar 23 together with the two upper rail parts 18 shifted upward until the crossbar 23 to the upper apex area of the circular opening area 61 the latch opening 59 strikes.

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

• EP 1548850 A1 [0003]

Claims (10)

Device for fastening at least one battery module ( 3 ) in a battery box of a motor vehicle, with at least one clamping unit ( 9 ) on opposite module sides ( 8th ) a headboard ( 31 ) and a base part ( 13 ), which via at least one tensioning element ( 15 ), which head part ( 31 ) is adjustable in a clamping position in which the battery module ( 3 ) between the head and base parts ( 13 . 31 ) is clamped, characterized in that the head part ( 31 ) of the clamping unit ( 9 ) is a pivotable in the clamping position clamping lever, with a lever arm ( 43 ) on a lever attachment ( 27 ) of the clamping element ( 15 ) is attachable. Device according to claim 1, characterized in that the tensioning element ( 15 ) one with respect to the base part ( 13 ) is upright ledge, and that in particular the strip ( 15 ) foot-side material uniform and / or in one piece and / or by a welded joint ( 17 ) with the base part ( 13 ) connected is. Apparatus according to claim 1 or 2, characterized in that the tensioning lever ( 31 ), in particular with respect to a lever axis ( 51 ) opposite lever arm ( 45 ) of the clamping lever ( 31 ), in the clamping position by a latching connection ( 31 ) and / or by a screw connection ( 49 ) is attachable. Device according to one of the preceding claims, characterized in that the tensioning lever ( 31 ) with the interposition of a clamping beam ( 47 ) on the module side ( 39 ) of the battery module ( 3 ) is supported and in particular in the clamping position on the clamping beam ( 47 ). Device according to one of the preceding claims, characterized in that the battery module ( 3 ) box-shaped from battery cells ( 7 ), which is located between two opposite end walls ( 5 ), in particular aluminum printing plates, and that in particular by means of the device at least one row (I, II) with at least two battery modules ( 3 ) are fastened and / or at least two in the vehicle vertical direction (z) stacked battery modules ( 3 ) are fastened. Device according to claim 5, characterized in that the end walls ( 5 ) of the battery module ( 3 ) Hollow section parts with channels ( 35 ) are, through which the clamping element ( 15 ) is feasible. Apparatus according to claim 5 or 6, characterized in that the clamping element ( 15 ) a lower strip part fixed to the base part ( 16 ) that in a stacking direction (z) with an upper strip part ( 18 ), the lever approach ( 27 ) having. Device according to one of Claims 5, 6 or 7, characterized in that between the battery modules stacked one above the other about the vehicle vertical direction (z) ( 3 ) a spacer ( 57 ) is provided, and that the spacer ( 57 ) along the marginal edges ( 12 ) of the battery modules ( 3 ) and / or in battery modules arranged in series (I, II) ( 3 ) the adjoining marginal edges ( 10 ) of the battery modules ( 3 ) covered. Device according to one of the preceding claims, characterized in that the base part ( 13 ), the tension carrier ( 47 ) and / or the spacer ( 57 ) Centering elements ( 33 ), which in corresponding centering openings ( 35 ) of the battery modules ( 3 ) protrude. Device according to one of the preceding claims, characterized in that the base part ( 13 ) Part of the battery box bottom ( 11 ).

Images