Arrangement having heat-conducting plate for electrical energy store
By designing structural components with thermal plates in the electric energy storage device, the problem of overheating of the single-metal monitoring device during voltage symmetry is solved, effective cooling and voltage symmetry is achieved, and simple, low cost and space savings are met. Requirements.
Patent Information
- Application Number
- CN202380049681.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-10-18
- Filing Date
- 2023-09-27
- Publication Date
- 2025-02-11
AI Technical Summary
The existing single-unit monitoring devices of electric energy storage are prone to overheating when voltage symmetricalization, resulting in the monitoring electronic device being turned off and unable to cool effectively.
A structural component is designed, including a retaining frame and a thermal conductor plate, which is used to fasten the energy storage module, and the thermal conductor plate is placed between the monitoring device and the retaining frame to export the waste heat of the monitoring device to the retaining frame.
Through the use of thermal conduction plates, the temperature of the single-metal monitoring device is effectively reduced, overheating and shutdown problems are avoided, and a simple, low-cost and structural space-saving cooling solution is realized.
Smart Images
Figure CN119422268A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a component of an electrical energy storage device for a motor vehicle. The invention also relates to an electrical energy storage device and a motor vehicle. Background Art
[0002] At present, the focus is on electrical energy storage devices, which can be used as power batteries for electrically driven motor vehicles, such as hybrid vehicles or electric vehicles. Such electrical energy storage devices can have multiple energy storage modules with interconnected energy storage cells, which are arranged in the energy storage housing of the electrical energy storage device. In order to monitor the energy storage cells, it is common that the energy storage cells are at least partially equipped with monitoring sensors and monitoring actuators, which can communicate with the cell monitoring electronics of the cell monitoring device or CSC (cell monitoring circuit) arranged in the energy storage housing. For example, the monitoring sensor device can have a voltage sensor for detecting the corresponding cell voltage. For example, the monitoring electronics can identify the different charge states of the energy storage cells according to the asymmetric cell voltage and control the monitoring actuator to perform charge state balancing, so-called cell balancing and thus for the voltage symmetry of the energy storage cells.
[0003] Symmetrization of the energy storage cells leads to an increase in the temperature of the cell monitoring device, which can lead to overheating and thus to a shutdown of the cell monitoring electronics. It is therefore necessary to dissipate the waste heat of the cell monitoring device and thus to cool the cell monitoring device. Summary of the invention
[0004] The object of the present invention is to provide a simple, cost-effective and space-saving possibility for dissipating heat from a single monitoring device for an electrical energy store of a motor vehicle.
[0005] This object is achieved according to the invention by an assembly, an electrical energy store and a motor vehicle having the features according to the respective independent claims. Advantageous embodiments of the invention are the subject matter of the dependent claims, the description and the drawings.
[0006] The structural assembly of an electric energy storage device for a motor vehicle according to the present invention has a retaining frame that can be fastened in an energy storage housing of the electric energy storage device, for accommodating at least one energy storage module of the electric energy storage device and for arranging the at least one energy storage module in an elevated manner relative to the energy storage housing wall of the energy storage housing. In addition, the structural assembly has a single-cell monitoring device arranged on the retaining frame, for monitoring the state of the energy storage single-cell of the energy storage module and for starting the charge state balance of the energy storage single-cell. The single-cell monitoring device has a plastic housing and a single-cell monitoring electronic device arranged in the plastic housing. The outer side of at least one frame element of the retaining frame has a protrusion for fastening and supporting the plastic housing, and the single-cell monitoring device is mechanically connected to the retaining frame via the protrusion. In addition, the structural assembly includes a heat conducting plate arranged between the retaining frame and the plastic housing, for conducting the waste heat of the single-cell monitoring device to the retaining frame. The heat conducting plate is arranged in a planar manner on the plastic housing and is fastened and supported on the protrusion together with the single-cell monitoring device for thermal coupling with the retaining frame.
[0007] The present invention also includes an electric energy storage device for a motor vehicle. The electric energy storage device has an energy storage device housing, a plurality of energy storage device modules arranged in the energy storage device housing, and a structural assembly according to the present invention. At least one energy storage device module of the electric energy storage device is arranged in a retaining frame and is held elevated relative to the energy storage device housing bottom of the energy storage device housing when a cavity is constructed for accommodating at least one energy storage device component of the electric energy storage device. The electric energy storage device is in particular a high-voltage energy storage device and is used as a rechargeable power battery or power storage battery for a motor vehicle. These energy storage devices or battery modules in particular have a cell stack composed of mutually stacked, mutually connected prismatic energy storage devices or battery cells. The energy storage device housing of the electric energy storage device can be constructed in two pieces, for example, and has a pot-shaped energy storage device housing bottom and a pot-shaped energy storage device housing top. The energy storage device housing bottom has an energy storage device housing wall in the form of an energy storage device housing bottom, and the energy storage device housing top has an energy storage device housing wall in the form of an energy storage device housing cover. In the assembled state, the side parts of the housing bottom part and the housing top part form a housing wall of the energy store in the form of a circumferential side wall.
[0008] A plurality of retaining struts for fastening and retaining energy storage modules can be arranged on the bottom of the energy storage housing. These energy storage modules fastened on the retaining struts are arranged in a first plane. At least one energy storage module is fastened to a retaining frame of a structural assembly, which raises the at least one energy storage module relative to other energy storage modules and is arranged relative to the bottom of the energy storage housing. The energy storage module arranged in the retaining frame is arranged in a second plane. The retaining frame is, for example, fastened to the lower part of the energy storage housing and arranged in a partial area of the end side of the energy storage housing, which is located below the rear seat row of the motor vehicle when the energy storage is installed in the motor vehicle. The retaining frame is, in particular, an aluminum casting. For example, the retaining frame is constructed as a rectangular shape having two long side frame elements and two short side frame elements. When the energy storage is installed in the motor vehicle, the long side frame element, for example, extends in the transverse direction of the vehicle, and the short side frame element extends in the longitudinal direction of the vehicle. In order to hold the raised energy storage module, the energy storage module is suspended, for example, in a holding frame, wherein the short-side frame elements extend along the opposite end sides of the cell stack and the long-side frame elements extend along the side areas of the energy storage cells stacked on one another. By arranging the at least one energy storage module elevated relative to the energy storage housing bottom, a cavity is formed between the energy storage housing bottom and the underside of the energy storage module, in which cavity further energy storage components, for example energy storage electronics, can be arranged.
[0009] In addition, the electric energy storage device has a single-cell monitoring device, which can communicate with the monitoring sensor device and the monitoring actuator of the energy storage module. The single-cell monitoring device has a single-cell monitoring electronic device, which can, for example, have a circuit board with an integrated circuit. The unit monitoring sensor device is arranged in a plastic housing and is connected to the monitoring sensor device and the monitoring actuator. For example, the plug connector of the single-cell monitoring electronic device can be led out of the plastic housing, and the plug connector is connected to the plug connection part of the line connected to the monitoring sensor device and the monitoring actuator. The single-cell monitoring device is designed to receive sensor data of the monitoring sensor device, such as a single-cell voltage or a module voltage, and to control the monitoring actuator, such as a balancing circuit of the energy storage cell and / or the energy storage module based on the sensor data, so as to make the single-cell voltage or the module voltage symmetrical.
[0010] The single-body monitoring device is also fastened to the holding frame here. In particular, the single-body monitoring device is arranged on one of the long-side frame elements in each of the long-side frame elements. For this purpose, the holding frame has a protrusion that is integrally constructed with one of the frame elements, and the protrusion is, for example, constructed as a threaded column. The plastic housing is supported by these protrusions and connected to the holding frame, for example, by a threaded connection. The plastic housing is particularly constructed as a flat housing, wherein the height of the flat housing corresponds at most to the height of the frame element, and the length of the flat housing is less than the length of the frame element. The thickness of the flat housing is significantly less than the height and width of the flat housing. By arranging the plastic housing at the protrusion, the plastic housing is not flatly abutted against the holding frame, but is arranged spaced apart from the holding frame in the case of constructing an intermediate space, so that due to the poor thermal conductivity of the plastic housing, sufficient heat transfer cannot occur between the single-body monitoring device and the holding frame. Therefore, when the single-body monitoring electronic device heats up when the voltage is symmetrical, overheating and failure of the single-body monitoring electronic device may occur.
[0011] In order to improve the heat transfer between the cell monitoring device and the holding frame, a heat conducting plate or heat transfer plate is provided. The heat conducting plate can be, for example, an aluminum plate. The heat conducting plate rests against that wall of the plastic housing which faces the outside of the frame element on which the cell monitoring device is fastened. The heat conducting plate is thus arranged between the plastic housing and the holding frame. In this case, the geometrical dimensions of the heat conducting plate correspond in particular at least to the geometrical dimensions of the wall of the plastic housing, so that the wall of the plastic housing is completely covered by the heat conducting plate.
[0012] The heat conducting plate is thermally coupled to the holding frame in that the heat conducting plate rests on a projection of the holding frame and is also fastened thereto. For example, the heat conducting plate can have a through hole in the region of the threaded stud, which is arranged aligned with a through opening in the plastic housing. The through hole and the through opening form a threaded hole through which a screw for fastening the heat conducting plate and the plastic housing to the holding frame can be guided. By means of the heat conducting plate resting flatly on the plastic housing, a good heat transfer between the cell monitoring electronics and the heat conducting plate can be provided. The heat conducting plate has a greater heat conducting capacity than the plastic housing and can conduct heat away to the holding frame via the projection.
[0013] Such cooling provided by the heat conducting plate of the individual monitoring electronics can be particularly simple and cost-effective, for example, as a stamped and bent part and has a particularly low weight and a small installation space requirement. In addition, the stamped and bent part can be integrated into the electrical energy storage device without further modification measures.
[0014] It has proven to be advantageous if the heat conducting plate has a pressing part for compensating unevenness when the heat conducting plate is in contact with the plastic housing. The pressing part of the heat conducting plate is arranged in particular overlapping with a region of the monitoring electronics arranged in the plastic housing which is at risk of overheating. It is desirable to arrange the heat conducting plate in contact with the plastic housing over all areas. However, this is difficult to achieve due to unevenness of the heat conducting plate caused by production and materials. Therefore, a pressing part is provided which is intended to compensate for these unevenness and thereby increase the surface area of the heat conducting plate available for heat conduction.
[0015] It can also be provided that the heat conducting plate has a bent-tab-shaped positioning and retaining element for the plastic housing. The bent-tab-shaped positioning and retaining element is arranged in particular at the edge of the heat conducting plate and forms a border for the plastic housing. The plastic housing can thus be equipped with the heat conducting plate, and the unit consisting of heat conducting plate and plastic housing can be fastened to the projection of the holding frame when forming the assembly.
[0016] The invention further comprises a motor vehicle having at least one electrical energy storage device according to the invention. The electrical energy storage device in particular forms a traction battery of the motor vehicle, so that the motor vehicle is designed as an electrified motor vehicle.
[0017] The embodiments described with regard to the assembly according to the invention and their advantages apply correspondingly to the electrical energy store according to the invention and to the motor vehicle according to the invention.
[0018] Further features of the invention are derived from the claims, the drawings and the description of the drawings. The features and feature combinations mentioned above in the description and the features and feature combinations mentioned below in the description of the drawings and / or shown individually in the drawings can be used not only in the respectively indicated combination but also in other combinations or individually. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The present invention will now be described in more detail based on preferred embodiments and with reference to the accompanying drawings.
[0020] Figure 1 A perspective view showing energy storage housing parts and components of an electrical energy storage device;
[0021] Figure 2 An exploded view showing the structural components;
[0022] Figure 3 A perspective view showing a holding frame of the structural assembly and a heat conducting plate;
[0023] Figure 4 A perspective view of a heat conducting plate of the assembly is shown. DETAILED DESCRIPTION
[0024] In the figures, identical elements or elements having the same function are provided with the same reference symbols.
[0025] Figure 1 A three-dimensional view of an energy storage housing component 1 and a structural component 2 for an electric energy storage device for a motor vehicle is shown. The energy storage housing component 1 is a pot-shaped energy storage housing lower part and has an energy storage housing wall 3 in the form of an energy storage housing bottom. A retaining support 4 is arranged on the energy storage housing bottom 3, for example, fixedly welded, on which an energy storage module of the electric energy storage device, not shown here, can be fastened. The retaining support 4 extends between two side parts 5 of the energy storage housing component 1, which are opposite to each other in the vehicle transverse direction Q in the conventional installation position of the energy storage device in the motor vehicle. The energy storage module is composed of prismatic energy storage monomers, which are stacked on each other along the stacking direction. Here, the stacking direction corresponds to the extension direction of the retaining support 4 along the vehicle transverse direction Q. The fastening area 6 extending in the longitudinal direction L of the vehicle on the side of the side part 5 is used to fasten the electric energy storage device to the body of the motor vehicle.
[0026] The structural assembly 2 has a holding frame 7, which is arranged in a partial area 8 of the end side of the energy storage housing part 1 and is fastened to the energy storage housing part 1. The rectangular holding frame 7 has a plurality of frame elements 7a, 7b, 7c, 7d. Here, two frame elements 7a, 7b are configured as long-side frame elements extending in the vehicle transverse direction Q, and two frame elements 7c, 7d are configured as short-side frame elements extending in the vehicle longitudinal direction L. At least one energy storage module can be fastened to the holding frame 7, so that the energy storage module is arranged in an elevated manner relative to the energy storage housing bottom 3. As a result, a cavity 8 is formed in the energy storage housing below the elevated energy storage module, in which another energy storage component, such as an energy storage electronic device, can be arranged.
[0027] Furthermore, a cell monitoring device 9 is arranged on the holding frame 7, which is used to monitor the energy storage cells of the energy storage module. Figure 2The exploded view of the structural assembly 2 in FIG. 1 shows a flat, box-shaped plastic housing 10 in which a cell monitoring electronic device, which is not visible here, is arranged. A plug connector 11 for electrically connecting the cell monitoring electronic device to the monitoring sensor device and actuator of the energy storage module protrudes from the plastic housing 10. The cell monitoring device 9 is fastened to the frame element 7a of the retaining frame 7 facing the inner cavity of the energy storage housing and thus facing the remaining energy storage modules. For this purpose, the outer side 12 of the frame element 7a has a projection 13 for fastening and supporting the plastic housing 10. The projection 13 is configured, for example, as a threaded column 14, which is used to fasten the plastic housing 10 by means of a screw 15. In addition, the outer side 12 has a wall-shaped limiting element 16, which limits the installation area of the plastic housing 10 on the outer side 12 of the frame element 7a. The plastic housing 10 can be placed at or on the limiting element 16 for positioning and holding.
[0028] Due to the low thermal conductivity of the plastic housing 10 and the small-area thermal connection of the plastic housing 10 to the holding frame 7 via the threaded studs 14, the waste heat of the cell monitoring electronics can only be insufficiently discharged to the holding frame 7, which is in particular designed as an aluminum casting. Therefore, the structural assembly 2 additionally has a heat conducting plate 17, which is arranged in the middle plane between the holding frame 7 and the plastic housing 10. The heat conducting plate 17 is arranged close to the plastic housing 10, so that the heat conducting plate completely covers the wall of the plastic housing 10. The heat conducting plate 17 has a through hole 18, which is arranged in alignment with the through opening 19 of the plastic housing 10 and with the threaded studs 14. As a result, the screw 15 can be introduced into the threaded studs 14 through the through opening 19 and the through hole 18, and the heat conducting plate 17 and the cell monitoring device 9 are thus fastened to the holding frame 7. The heat conducting plate 17 is thermally coupled to the holding frame 7 via the threaded studs 14. Figure 3 The holding frame 7 is shown with the heat conducting plate 7 fastened thereto without the individual monitoring components 9 . Figure 4 Only the heat conducting plate 17 is shown.
[0029] The heat conducting plate 17 also has a embossing 20, which is arranged in that region of the heat conducting plate 17 which is arranged overlapping with the region of the individual monitoring electronics which is at risk of overheating. The embossing 20 serves to compensate for unevenness of the heat conducting plate 17, so that it rests as fully as possible on the plastic housing 10. The heat conducting plate 17 also has hook-shaped, bent-tab-like positioning and retaining elements 21, which serve to retain the plastic housing 10. The positioning and retaining elements 21 are arranged in the region of the lower corners 22 of the heat conducting plate 17 which are opposite in the vehicle transverse direction Q, so that the plastic housing 10 can be bordered by the positioning and retaining elements 21 and retained on the heat conducting plate 17.
Claims
1. A component (2) for an electrical energy storage device of a motor vehicle, comprising: - a holding frame (7) which can be fastened in an energy storage housing of the electrical energy storage device for accommodating at least one energy storage module of the electrical energy storage device and for arranging the at least one energy storage module elevated relative to an energy storage housing wall (3) of the energy storage housing, - a cell monitoring device (9) arranged on the holding frame (7), the cell monitoring device being used to monitor the state of energy storage cells of the energy storage module and to initiate charge state balancing of the energy storage cells, the cell monitoring device having a plastic housing (10) and cell monitoring electronics arranged in the plastic housing (10), wherein: The outer side (12) of at least one frame element (7a) of the holding frame (7) has a projection (13) for fastening and supporting the single-unit monitoring device (9), and the plastic housing (10) of the single-unit monitoring device (9) is fastened to the projection. - a heat conducting plate (17) arranged between the holding frame (7) and the plastic housing (10), the heat conducting plate being used to conduct waste heat of the cell monitoring device (9) to the holding frame (7), the heat conducting plate being arranged in flat contact with the plastic housing (10), and being fastened and supported together with the plastic housing (10) on the projection (13) for thermal coupling with the holding frame (7).
2. The structural component (2) according to claim 1, characterized in that The projection (13) on the outer side (12) of the frame element (7a) is configured as a threaded column (14), via which the plastic housing (10) and the heat conducting plate (17) are screwed to the holding frame (7).
3. The structural component (2) according to claim 1 or 2, characterized in that The heat conducting plate (17) has a pressed portion (20) for compensating for unevenness when the heat conducting plate (17) is in a state of resting on the plastic housing (10).
4. The structural component (2) according to claim 3, characterized in that The embossing (20) of the heat conducting plate (17) is arranged overlapping a region of the monitoring electronics arranged in the plastic housing (10) which is at risk of overheating.
5. The structural component (2) according to any one of the preceding claims, characterized in that The heat conducting plate (17) has a bent-over web-shaped positioning and retaining element (21) for the plastic housing (10).
6. Structural element (2) according to any one of the preceding claims, characterized in that The plastic housing (10) is designed as a flat housing, wherein the height of the flat housing (10) at most corresponds to the height of the frame element (7a) and the length of the flat housing (10) is shorter than the length of the frame element (7a).
7. Structural element (2) according to any one of the preceding claims, characterized in that The holding frame (7) is of rectangular design and has two long-side frame elements (7a, 7b) and two short-side frame elements (7c, 7d), wherein the individual monitoring device (9) is arranged on one of the long-side frame elements (7a).
8. Structural element (2) according to any one of the preceding claims, characterized in that The retaining frame (7) is an aluminum casting.
9. An electrical energy storage device for a motor vehicle, comprising: - accumulator housing, - a plurality of energy storage modules, which are arranged in the energy storage housing, - Structural assembly (2) according to any of the preceding claims, wherein At least one energy storage module is arranged in the holding frame (7) and is arranged elevated relative to an energy storage housing bottom (3) of the energy storage housing, with a cavity (8) formed for accommodating at least one energy storage component of the electrical energy storage device. 10 . A motor vehicle having at least one electrical energy storage device according to claim 9 .