阅读说明：本技术 用于机动车辆的电池模块 (Battery module for a motor vehicle ) 是由 P·克勒纳 J·鲍莱恩 M·科尔曼泰勒 于 2019-07-04 设计创作，主要内容包括：本发明涉及一种用于机动车辆的电池模块(20)。该电池模块(20)包括：一个电池模块壳体(30)；至少一个电池单元组(40,41),该电池单元组沿安装方向(M1,M2)被插入该电池模块壳体(30)中并且包括至少两个电串联连接的电池单元；以及至少两个用于封闭该电池模块壳体(30)的头板(50)。这些头板(50)被布置并设计为,用于沿安装方向(M1,M2)间接地或直接地向该电池单元组(40,41)上施加预紧力。(The invention relates to a battery module (20) for a motor vehicle. The battery module (20) includes: a battery module housing (30); at least one cell group (40, 41) which is inserted into the battery module housing (30) in a mounting direction (M1, M2) and comprises at least two battery cells which are electrically connected in series; and at least two head plates (50) for enclosing the battery module housing (30). The head plates (50) are arranged and designed to apply a pretensioning force to the cell stacks (40, 41) indirectly or directly in the installation direction (M1, M2).)

1. A battery module for a motor vehicle, the battery module comprising: a battery module housing (30); at least one cell group (40, 41) which is inserted into the battery module housing (30) in a mounting direction (M1, M2) and comprises at least two battery cells which are electrically connected in series; and two head plates (50) for closing the battery module housing (30), characterized in that the head plates (50) are arranged and designed for applying a pretensioning force to the cell groups (40, 41) indirectly or directly in a mounting direction (M1, M2).

2. The battery module according to claim 1, characterized by at least two cell stacks (40, 41) which are arranged one behind the other in a mounting direction (M1, M2), wherein the head plate (50) is arranged and designed for applying a pretensioning force to the cell stacks (40, 41) indirectly or directly in the mounting direction (M1, M2).

3. The battery module according to claim 1 or 2, characterized in that the battery module housing (30) surrounds the cell stack (40, 41) or the cell stacks (40, 41) from four sides, wherein an opening (32) is arranged at each of the two remaining sides of the battery module housing (30), through which opening the cell stack (40, 41) is inserted into the battery module housing (30) in the mounting direction (M1, M2) and which opening is closed by means of one of the head plates (50).

4. The battery module according to claim 1 or 2, characterized in that the head plate (50) is connected, preferably screwed or welded, to the battery module housing (30) in a form-fitting and/or force-fitting and/or material-fitting manner.

5. Battery module according to claim 1 or 2, characterized by at least one spring element (60) which is arranged between the head plate (50) and a cell stack (40, 41) and/or between the cell stacks (40, 41).

6. The battery module as claimed in claim 5, characterized in that the at least one spring element (60) is designed as a leaf spring or as a disk spring.

7. The battery module as claimed in claim 5, characterized in that the spring element (60) is made of steel or fiber-reinforced plastic, in particular glass-fiber-reinforced plastic.

8. Battery module according to claim 5, characterized in that the spring element (60) is designed for applying a substantially constant force to the cell stack (40, 41) and/or the head plate (50) over its spring travel.

9. Battery module according to claim 1 or 2, characterized by at least one compensation element (70) which is arranged to compensate for tolerances between the head plate (50) and the cell stack (40, 41) and/or between the cell stacks (40, 41).

10. A mounting method for a battery module (20), the method comprising the following method steps:

-providing one battery module housing (30), at least one cell group (40, 41), and two head plates (50), wherein the at least one cell group (40, 41) comprises at least two battery cells connected electrically in series;

-inserting at least one cell group (40, 41) in the mounting direction (M1, M2) into the battery module housing (30); and is

-closing the battery module housing (30) and pretensioning the at least one cell group (40, 41) indirectly or directly in the mounting direction (M1, M2) through the head plate (50).

11. Mounting method according to claim 10, characterized in that at least two cell stacks (40, 41) are arranged one behind the other in the mounting direction (M1, M2) into the battery module housing (30), wherein the at least two cell stacks (40, 41) are pretensioned by means of the head plate (50) in the mounting direction (M1, M2).

12. Mounting method according to claim 10 or 11, wherein the battery module housing (30) surrounds the battery cell group (40, 41) or the battery cell groups (40, 41) from four sides, wherein openings (32) are arranged at each of the remaining two sides of the battery module housing (30), characterized in that the battery cell group (40, 41) is inserted into the battery module housing (30) through one of the openings (32) in a mounting direction (M1, M2).

13. Mounting method according to claim 10 or 11, characterized in that the head plate (50) is connected, preferably screwed or welded, to the battery module housing (30) in a form-fitting and/or force-fitting and/or material-fitting manner in order to close the battery module housing (30) and in order to pretension the at least one battery cell group (40, 41) indirectly or directly in the mounting direction (M1, M2).

14. Mounting method according to claim 10 or 11, characterized in that at least one spring element (60) is arranged between the head plate (50) and the cell stacks (40, 41) and/or between the cell stacks (40, 41), wherein preferably a substantially constant force is exerted on the cell stacks (40, 41) and/or the head plate (50) over their spring stroke by means of the spring element (60).

15. Mounting method according to claim 10 or 11, characterized in that at least one compensation element (70) is arranged between the head plate (50) and a cell stack (40, 41) and/or between the cell stacks (40, 41), wherein preferably tolerances between the head plate (50) and a cell stack (40, 41) and/or between the cell stacks (40, 41) are compensated for by means of this compensation element (70).

Technical Field

The invention relates to a battery module for a motor vehicle and to a method for mounting such a battery module. The battery module may be a battery module of a motor vehicle battery, in particular of a traction battery of a motor vehicle.

Background

Battery modules are known from the prior art, which comprise a battery module housing and a plurality of battery cells which are electrically connected to one another and are arranged in the form of cell stacks in the interior of the battery module housing.

During operation of the battery cell (charging/discharging), swelling of the battery cell, so-called swelling, may result. Swelling of the battery cells may result in a reduction in the service life of the battery cells. In order to prevent a reduction in the service life, it is known from the prior art to pretension the battery cells with the aid of metallic tension bands and then to insert the battery cells into the battery module housing.

Disclosure of Invention

It is an object of the present invention to provide a battery module having a simplified installation and an extended service life.

This object is achieved by a battery module according to the following 1 and a method for mounting a battery module according to the following 10, the following 2-9 and 11-15 being preferred solutions of the present invention:

1. a battery module for a motor vehicle, the battery module comprising: a battery module housing (30); at least one cell group (40, 41) which is inserted into the battery module housing (30) in a mounting direction (M1, M2) and comprises at least two battery cells which are electrically connected in series; and two head plates (50) for closing the battery module housing (30), characterized in that the head plates (50) are arranged and designed for applying a pretensioning force to the cell groups (40, 41) indirectly or directly in a mounting direction (M1, M2).

2. The battery module as claimed in claim 1, characterized by at least two cell stacks (40, 41) which are arranged one behind the other in the mounting direction (M1, M2), wherein the head plate (50) is arranged and designed for applying a pretensioning force to the cell stacks (40, 41) indirectly or directly in the mounting direction (M1, M2).

3. The battery module according to one of the preceding claims 1 or 2, characterized in that the battery module housing (30) surrounds the battery cell group (40, 41) or the battery cell groups (40, 41) from four sides, wherein an opening (32) is arranged in each case at the remaining two sides of the battery module housing (30), through which opening the battery cell group (40, 41) is inserted into the battery module housing (30) in the mounting direction (M1, M2) and which opening is closed by means of one of the head plates (50).

4. The battery module according to one of the preceding claims 1 to 3, characterized in that the head plate (50) is connected, preferably screwed or welded, to the battery module housing (30) in a form-fitting and/or force-fitting and/or material-fitting manner.

5. The battery module according to one of the above claims 1 to 4, characterized by at least one spring element (60) arranged between the head plate (50) and a cell stack (40, 41) and/or between the cell stacks (40, 41).

6. The battery module as claimed in claim 5, characterized in that the at least one spring element (60) is designed as a leaf spring or as a disk spring.

7. The battery module as claimed in one of the preceding claims 5 or 6, characterized in that the spring element (60) is made of steel or fiber-reinforced plastic, in particular glass-fiber-reinforced plastic.

8. The battery module according to one of the preceding claims 5 to 7, characterized in that the spring element (60) is designed for applying a substantially constant force to the cell stack (40, 41) and/or the head plate (50) over its spring travel.

9. Battery module according to one of the above-mentioned 1 to 8, characterized by at least one compensation element (70) which is arranged to compensate for tolerances between the head plate (50) and the cell stacks (40, 41) and/or between the cell stacks (40, 41).

10. A mounting method for a battery module (20), the method comprising the following method steps:

-providing one battery module housing (30), at least one cell group (40, 41), and two head plates (50), wherein the at least one cell group (40, 41) comprises at least two battery cells connected electrically in series;

-inserting at least one cell group (40, 41) in the mounting direction (M1, M2) into the battery module housing (30); and is

-closing the battery module housing (30) and pretensioning the at least one cell group (40, 41) indirectly or directly in the mounting direction (M1, M2) through the head plate (50).

11. The mounting method according to the above 10, characterized in that at least two cell stacks (40, 41) are arranged one behind the other in the mounting direction (M1, M2) into the battery module housing (30), wherein the at least two cell stacks (40, 41) are pretensioned by means of the head plate (50) in the mounting direction (M1, M2).

12. The mounting method according to one of the above-mentioned 10 or 11, wherein the battery module housing (30) surrounds the battery cell group (40, 41) or the battery cell groups (40, 41) from four sides, wherein openings (32) are arranged at each of the remaining two sides of the battery module housing (30), characterized in that the battery cell group (40, 41) is inserted into the battery module housing (30) through one of the openings (32) in a mounting direction (M1, M2).

13. The mounting method according to one of the preceding claims 10 to 12, characterized in that, for closing the battery module housing (30) and for preloading the at least one battery cell stack (40, 41) indirectly or directly in the mounting direction (M1, M2), the head plate (50) is connected, preferably screwed or welded, to the battery module housing (30) in a form-fitting and/or force-fitting and/or material-fitting manner.

14. Mounting method according to one of the above-mentioned 10 to 13, characterized in that at least one spring element (60) is arranged between the head plate (50) and the cell stacks (40, 41) and/or between the cell stacks (40, 41), wherein a substantially constant force is exerted on the cell stacks (40, 41) and/or the head plate (50) over their spring stroke, preferably by means of the spring element (60).

15. Mounting method according to one of the above-mentioned 10 to 14, characterized in that at least one compensation element (70) is arranged between the head plate (50) and a cell stack (40, 41) and/or between the cell stacks (40, 41), wherein preferably tolerances between the head plate (50) and a cell stack (40, 41) and/or between the cell stacks (40, 41) are compensated for by means of the compensation element (70).

The battery module according to the present invention includes: a battery module housing; at least one battery cell group inserted into the battery module case in the mounting direction and including at least two battery cells electrically connected in series; and two head plates for closing the battery module case. The head plates are arranged and designed to apply a pretensioning force to the cell stack in the installation direction either indirectly or directly.

Such a configuration allows for simplified installation of the battery module and at the same time for a long service life of the battery module. The invention is particularly advantageous when using load-bearing battery modules, since the battery module housing already meets the requirements on the structural mechanics (wall thickness, strength, etc.) for receiving the expansion forces of the battery cells in view of the crash requirements of the motor vehicle without further adaptation of the battery module housing.

In a preferred embodiment, the battery module comprises at least two cell stacks arranged behind one another in the installation direction, wherein the head plates are arranged and designed to apply a pretensioning force to the cell stacks indirectly or directly in the installation direction.

Preferably, a first cell stack of the at least two cell stacks is inserted into the battery module case along a first installation direction, and a second cell stack of the at least two cell stacks is inserted into the battery module case along a second installation direction, which extends opposite to the first installation direction.

In a preferred embodiment, the battery module housing encloses the cell stack or the cell stacks from four sides, wherein an opening is respectively arranged at the two remaining sides of the battery module housing, through which opening the cell stack is inserted into the battery module housing in the mounting direction (preferably in the first mounting direction and/or in the second mounting direction) and which opening is closed by one of the head plates.

Preferably, the head plate is connected, preferably screwed or welded, to the battery module housing in a form-fitting and/or force-fitting and/or material-fitting manner.

In a preferred configuration, the battery module further comprises at least one spring element which is arranged between the head plates and the battery cell stack and/or between the battery cell stacks.

The spring element can be used to pretension the battery cell stack and to compensate for expansion of the battery cells.

Preferably, the at least one spring element can be designed as a leaf spring or as a disk spring.

In a preferred embodiment, the spring element is made of steel or fiber-reinforced plastic, in particular glass fiber-reinforced plastic.

The spring element is preferably designed to exert a substantially constant force on the cell stack and/or the head plate over its spring travel. The service life of the battery unit can thereby be further increased.

In a preferred configuration, the battery module further comprises at least one compensation element arranged to compensate for tolerances between the head plates and the cell stack and/or between the cell stacks.

The invention further relates to a method for mounting a battery module, comprising the following method steps:

-providing one battery module housing, at least one battery cell stack comprising at least two battery cells electrically connected in series, and two head plates;

-inserting at least one cell stack in the mounting direction into the battery module housing; and is

Closing the battery module housing and indirectly or directly preloading the at least one cell stack in the mounting direction by means of the head plates.

In a preferred embodiment, at least two battery cell stacks are arranged in the battery module housing behind one another in the mounting direction, wherein the at least two battery cell stacks are prestressed in the mounting direction by means of the head plates.

Preferably, a first cell stack of the at least two cell stacks is inserted into the battery module case in a first mounting direction, and a second cell stack of the at least two cell stacks is inserted into the battery module case in a second mounting direction, which extends opposite to the first mounting direction.

In a preferred embodiment, the battery module housing encloses the battery cell stack or the battery cell stacks from four sides, wherein openings are arranged in each case at the two remaining sides of the battery module housing, characterized in that the battery cell stack is inserted into the battery module housing in the mounting direction through one of the openings.

Preferably, the head plates are connected, preferably screwed or welded, to the battery module housing in a form-fitting and/or force-fitting and/or material-fitting manner in order to close the battery module housing and to pretension the at least one battery cell stack indirectly or directly in the mounting direction.

In a preferred embodiment, at least one spring element is arranged between the head plate and the cell stack and/or between the cell stacks, wherein preferably a substantially constant force is exerted on the cell stack and/or the head plate by means of the spring element over its spring travel.

Preferably, at least one compensation element is arranged between the head plate and the cell stack and/or between the cell stacks, wherein preferably tolerances between the head plate and the cell stack and/or between the cell stacks are compensated by means of the compensation element.

Drawings

Details and further advantages of the battery module according to the invention and of the method for mounting a battery module according to the invention will be explained with the aid of the embodiments described below. Shown here are:

fig. 1 and 2 illustrate perspective views of a battery module according to the present application according to an embodiment.

Detailed Description

The present application relates to a battery module 20 for a motor vehicle. The battery module 20 includes: a battery module case 30; at least one cell stack 40, 41 which is inserted into the battery module housing 30 in the mounting direction M1, M2 and comprises at least two battery cells connected electrically in series; and two head plates 50 for closing the battery module case 30. The head plate 50 is arranged and designed to apply a pretensioning force to the cell stacks 40, 41 indirectly or directly in the mounting direction M1, M2. Fig. 2 shows the battery module 20 in an assembled state according to the embodiment.

The battery module may include at least two cell groups 40, 41 arranged behind each other in the mounting directions M1, M2. The head plate 50 can be arranged and designed for applying a pretensioning force to the cell stacks 40, 41 indirectly or directly in the mounting direction M1, M2.

The cell stacks 40, 41 may include a carrier structure 42 at the end of the cell stacks 40, 41 that is first inserted into the battery module housing 30. This is particularly apparent from fig. 1. The cell stacks 40, 41, which are prestressed by means of the head plate 50, can be supported on one another in the middle of the battery module housing 30, in particular by means of their carrier structure 42. Alternatively, the cell stacks 40, 41 in the middle of the battery module housing 30 may themselves be supported on the battery module housing 30, in particular on welded sleeves of the battery module housing 30. The carrier structure 42 may be made of plastic. The batteries of the cell stacks 40, 41 may be implemented as pouch cells or prismatic cells. The battery module housing 30 may be implemented as a single piece or as multiple pieces.

Preferably, a first cell stack 40 of the at least two cell stacks 40, 41 is inserted into the battery module case 30 in a first mounting direction M1, and a second cell stack 41 of the at least two cell stacks 40, 41 is inserted in a second mounting direction M2, wherein the second mounting direction M2 extends opposite to the first mounting direction M1.

The battery module housing 30 can enclose the cell stacks 40, 41 or the cell stacks 40, 41 from four sides, as is shown in particular in fig. 1. At the two other sides of the battery module housing 30, an opening 32 is arranged in each case, through which the cell stacks 40, 41 can be inserted into the battery module housing 30 in the mounting direction M1, M2 and which is closed by means of one of the head plates 50.

The head plate 50 can be connected, preferably screwed or welded, to the battery module housing 30 by means of a form fit and/or a force fit and/or a material fit.

The battery module 20 may further comprise at least one spring element 60 arranged between the head plate 50 and the cell stacks 40, 41 and/or between these cell stacks 40, 41. The spring element 60 can be designed to indirectly apply a pretensioning force on the cell stacks 40, 41. In this case, the head plate 50 exerts a prestressing force on the spring elements 60, which transmit the prestressing force to the cell stacks 40, 41.

The at least one spring element 60 can be designed as a leaf spring or as a disk spring. The spring element 60 can be made of steel or fiber-reinforced plastic, in particular of glass-fiber-reinforced plastic.

The spring element 60 may be designed to apply a substantially constant force to the cell stacks 40, 41 and/or the head plate 50 over the spring travel.

The battery module 20 may comprise at least one compensation element 70 arranged to compensate for tolerances between the head plate 50 and the cell stacks 40, 41 and/or between the cell stacks 40, 41. The compensating element 70 can be designed, for example, as a foam mat.

The present application also relates to a method for mounting a battery module 20 according to the present application. The method comprises the following method steps:

providing one battery module housing 30, at least one battery cell group 40, 41 comprising at least two battery cells electrically connected in series, and two head plates 50;

inserting at least one cell group 40, 41 into the battery module housing 30 in a mounting direction M1, M2; and is

Closing the battery module housing 30 and pretensioning the at least one cell stack 40, 41 indirectly or directly in the mounting direction M1, M2 by means of the head plates 50.

Fig. 2 shows a battery module 20 assembled by means of a method according to the present application.

At least two cell stacks 40, 41 may be arranged in the battery module housing 30 in the mounting direction M1, M2 behind one another. The at least two cell stacks 40, 41 can be pretensioned by means of the head plate 50 in the installation direction M1, M2. Here, a first cell stack 40 of the cell stacks 40, 41 may first be inserted into the battery module case 30 along the first mounting direction M1, and then a second cell stack 41 of the cell stacks 40, 41 may be inserted into the battery module case 30 along the second mounting direction M2.

The battery module housing 30 may surround the cell stacks 40, 41 or the cell stacks 40, 41 from four sides. Openings 32 may be disposed at each of the remaining two faces of the battery module case 30. The cell stacks 40, 41 may be inserted into the battery module housing 30 through one of the openings 32 in the mounting directions M1, M2.

In order to close the battery module housing 30 and to pretension the at least one cell stack 40, 41 indirectly or directly in the mounting direction M1, M2, the head plate 50 can be connected, preferably screwed or welded, to the battery module housing 30 in a form-fitting and/or force-fitting and/or material-fitting manner.

At least one spring element 60 may be arranged between the head plate 50 and the cell stacks 40, 41 and/or between the cell stacks 40, 41. By means of the spring element 60, a substantially constant force can be exerted on the cell stacks 40, 41 and/or the head plate 50 over their spring travel.

At least one compensation element 70 may be arranged between the head plate 50 and the cell stacks 40, 41 and/or between the cell stacks 40, 41. Tolerances between the head plate 50 and the battery cell stacks 40, 41 and/or between the battery cell stacks 40, 41 can be compensated for by means of the compensation element 70.