Power battery module

Abstract

The invention discloses a power battery module which comprises a lower shell (1) and a battery cell monomer (2), the lower shell (1) comprises a bottom plate (3), a front side beam (4), a rear side beam (5), a left side beam (6) and a right side beam (7), the front side beam (4), the rear side beam (5), the left side beam (6) and the right side beam (7) are fixedly arranged on four edges of the bottom plate (3) respectively, the battery cell monomer (2) is placed on the bottom plate (3), and the battery cell monomer (2) is arranged on the bottom plate (3). A lateral pressing plate (8) is arranged on the bottom plate (3), and a plurality of first pressing strips (9) are arranged at the tops of the battery cell monomers (2). The LED lamp has the advantages of being compact in structure, small in occupied space and good in heat dissipation effect.

Description

Technical Field

[0001] The invention relates to a battery, in particular to a power battery module. Background Art

[0002] The structural design of the lower shell of the power battery is based on the product function requirements, performance requirements, size requirements, weight requirements, hard point layout requirements, interface requirements, protection requirements, etc. of the power battery shell of the whole vehicle, to develop the best box design and the battery module design, electrical connection design, and fastening design inside the battery pack.

[0003] At present, the power battery module is mainly composed of a plastic shell and a battery cell. The plastic shell is injection molded and has a fixed shape and cannot be elongated or shortened. If a platform-based power battery shell is designed, the development cost is high and the cycle is long. In addition, the existing power battery shell mostly adopts a bottom cooling solution, which has a poor battery cooling effect and increases the height of the entire battery module, increasing the space occupied by the battery module. Summary of the invention

[0004] The purpose of the present invention is to provide a power battery module to solve the technical problems in the prior art, which has the advantages of compact structure, small space occupation and good heat dissipation effect.

[0005] The present invention provides a power battery module, including a lower shell and a battery cell. The lower shell includes a bottom plate, a front side beam, a rear side beam, a left side beam and a right side beam. The front side beam, the rear side beam, the left side beam and the right side beam are respectively fixed on the four sides of the bottom plate. The battery cell is placed on the bottom plate. A lateral pressure plate is arranged on the bottom plate. A plurality of first pressure strips are arranged on the top of the battery cell.

[0006] In the aforementioned power battery module, preferably, a plurality of limiting beams are fixedly provided at equal intervals on the top surface of the bottom plate, a mounting groove is formed between two adjacent limiting beams, the width of the mounting groove is equal to the length of the battery cell, and insulating paper is pasted on the limiting beams.

[0007] The aforementioned power battery module preferably also includes a heat dissipation device, which includes a liquid-cooling flat tube, a first connecting tube and a second connecting tube. The number of the liquid-cooling flat tubes is multiple, all of the liquid-cooling flat tubes are arranged at the same height and are parallel to each other, the first connecting tube and the second connecting tube are located at the same end of the liquid-cooling flat tube, the first connecting tube is connected to the liquid inlets of all the liquid-cooling flat tubes, and the second connecting tube is connected to the liquid outlets of all the liquid-cooling flat tubes.

[0008] In the aforementioned power battery module, preferably, two rows of battery cells are arranged between two adjacent liquid-cooling flat tubes, and thermally conductive silicone is filled between the side walls of the liquid-cooling flat tubes and the side walls of the battery cells.

[0009] In the aforementioned power battery module, preferably, the lateral pressure plate is fixed on one end of the bottom plate close to the front side beam.

[0010] In the aforementioned power battery module, preferably, a plurality of threaded holes are respectively provided on the left and right sides of the bottom plate, and the two ends of the first pressure strip are respectively connected to the bottom plate through first connecting rods.

[0011] In the aforementioned power battery module, preferably, the cross-sectional shape of the first pressure strip is a "T" shape.

[0012] In the aforementioned power battery module, preferably, it further includes two second pressure strips, the second pressure strips have an "L"-shaped limiting surface, and the two ends of the second pressure strips are connected to the bottom plate through second connecting rods.

[0013] In the aforementioned power battery module, preferably, the cross-sectional shape of the right beam is a "J" shape.

[0014] Compared with the prior art, the present invention includes a lower shell and a battery cell. The lower shell includes a bottom plate, a front side beam, a rear side beam, a left side beam and a right side beam. The front side beam, the rear side beam, the left side beam and the right side beam are respectively fixed on the four sides of the bottom plate. The battery cell is placed on the bottom plate. A lateral pressure plate is arranged on the bottom plate. A plurality of first pressure strips are arranged on the top of the battery cell. The size of the lower shell of the present invention can be designed according to the requirements, so as to facilitate the arrangement of different numbers of battery cells to meet different requirements. By setting the rear side beam and the lateral pressure plate, the battery cell can be limited in the horizontal direction. By setting the first pressure strip, the battery cell can be limited in the longitudinal direction.

[0015] By setting up the heat dissipation device, the liquid-cooling flat tubes are located between the battery cells, which effectively reduces the overall size of the power battery module, reduces the occupied space, improves space utilization, and improves the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a top view of the overall structure of the present invention;

[0017] Figure 2 is an axonometric view of the lower shell;

[0018] Figure 3 It is an axonometric view of the base plate;

[0019] Figure 4 It is an axonometric view of a battery cell;

[0020] Figure 5 It is an axonometric view of the heat sink;

[0021] Figure 6 This is the assembly relationship diagram of the liquid cooling flat tube and the battery cell monomer;

[0022] Figure 7 It is a partial structural schematic diagram of the present invention;

[0023] Figure 8 It is a schematic diagram of the structure of insulating paper;

[0024] Fig. 9 is an axonometric view of the lateral pressure plate;

[0025] Fig.10 1 is a schematic diagram of the local structure of the first layering strip;

[0026] Fig.11 It is a schematic diagram of the partial structure of the second layering strip.

[0027] Explanation of the reference numerals: lower shell 1, battery cell 2, bottom plate 3, front side beam 4, rear side beam 5, left side beam 6, right side beam 7, lateral pressure plate 8, first pressure strip 9, limiting beam 10, mounting groove 11, liquid-cooling flat tube 12, first connecting tube 13, second connecting tube 14, second pressure strip 15, insulating paper 16. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0029] Embodiments of the present invention: Figure 1-Figure 11 As shown, a power battery module includes a lower shell 1 and a battery cell 2. The lower shell 1 includes a bottom plate 3, a front side beam 4, a rear side beam 5, a left side beam 6 and a right side beam 7. The front side beam 4, the rear side beam 5, the left side beam 6 and the right side beam 7 are respectively fixed on the four sides of the bottom plate 3. The battery cell 2 is placed on the bottom plate 3. A lateral pressure plate 8 is arranged on the bottom plate 3. A plurality of first pressure strips 9 are arranged on the top of the battery cell 2.

[0030] In this embodiment, the bottom plate 3, the front side beam 4, the rear side beam 5, the left side beam 6 and the right side beam 7 are all made of aluminum, which are assembled and welded to form the lower shell 1. Their sizes can be adjusted according to the requirements of the vehicle model, so that the lower shell 1 can accommodate different numbers of battery cells 2 to meet the usage requirements of different vehicle models.

[0031] The front side beam 4 is opposite to and parallel to the rear side beam 5 , the left side beam 6 is opposite to and parallel to the right side beam 7 , and a plurality of functional holes are provided on the front side beam 4 for convenient installation of the wiring harness connector.

[0032] In a specific embodiment, a plurality of limiting beams 10 are fixedly arranged at equal intervals on the top surface of the bottom plate 3 , a mounting groove 11 is formed between two adjacent limiting beams 10 , the width of the mounting groove 11 is equal to the length of the battery cell 2 , and insulating paper is pasted on the limiting beams 10 .

[0033] The bottom plate 3 and the limiting beam 10 are integrally formed to avoid protruding welding points caused by profile assembly and welding that affect assembly. Before the battery cell 2 is installed in the installation groove 11, foam needs to be pasted on the bottom of the battery cell 2 to ensure good insulation.

[0034] For the convenience of description, the direction perpendicular to the left beam 6 and the right beam 7 is the transverse direction, the direction perpendicular to the front beam 4 and the rear beam 5 is the longitudinal direction, and the mounting groove 11 extends in the longitudinal direction on the bottom plate 3 .

[0035] Furthermore, it also includes a heat dissipation device, which includes a liquid-cooled flat tube 12, a first connecting tube 13 and a second connecting tube 14. There are multiple liquid-cooled flat tubes 12, all of which are arranged at the same height and parallel to each other. The first connecting tube 13 and the second connecting tube 14 are located at the same end of the liquid-cooled flat tube 12, the first connecting tube 13 is connected to the liquid inlets of all the liquid-cooled flat tubes 12, and the second connecting tube 14 is connected to the liquid outlets of all the liquid-cooled flat tubes 12.

[0036] In order to ensure the heat dissipation effect, in this embodiment, two rows of battery cells 2 are arranged between two adjacent liquid-cooled flat tubes 12, and the side walls of the liquid-cooled flat tubes 12 and the side walls of the battery cells 2 are filled with thermal conductive silicone. The thermal conductive silicone can better transfer the heat generated by the battery cells 2 to the liquid-cooled flat tubes 12, thereby achieving a better cooling effect.

[0037] The battery cells 2 arranged in the transverse direction form a row, and the battery cells 2 arranged in the same mounting groove 11 form a column. The two rows of battery cells 2 between two adjacent liquid-cooling flat tubes 12 are separated by insulating paper 16 and foam to ensure the insulation performance between the battery cells 2 and avoid the battery cells 2 being squeezed and deformed during the assembly process, thereby affecting the safety performance of the battery pack.

[0038] The lateral pressing plate 8 is fixed on the bottom plate 3 at one end close to the front side beam 4. After all the battery cells 2 are assembled, the lateral pressing plate 8 is used to integrate the battery cells 2, the liquid cooling flat tube 12, and the insulating paper 16, and the battery cells are squeezed from front to back with a certain pressure, in order to reduce the gap between the battery cells 2 and the liquid cooling flat tube 12, and between the battery cells 2 and the battery cells 2, and increase the rigidity and strength of the whole package. After the lateral pressing plate 8 is pressed, the first pressing strip 9 is installed to improve the rigidity of the overall structure.

[0039] Furthermore, a plurality of threaded holes are respectively provided on the left and right sides of the bottom plate 3, and the two ends of the first pressure strip 9 are respectively connected to the bottom plate 3 through the first connecting rod. The cross-section of the first pressure strip 9 is in a "T" shape.

[0040] A first pressure strip 9 is disposed between two adjacent horizontal rows of battery cells 2 . The first pressure strip 9 is designed to be “T”-shaped, which can not only separate the two horizontal rows of battery cells 2 , but also limit the top surface of the battery cells 2 , thereby restricting the longitudinal freedom of the battery cells 2 .

[0041] Preferably, two second pressure strips 15 are further included, and the second pressure strips 15 have an "L"-shaped limiting surface, and both ends of the second pressure strips 15 are connected to the bottom plate 3 through second connecting rods. The second pressure strips 15 are used to protect and limit the battery cells 2 in the front and rear rows.

[0042] Furthermore, the cross-sectional shape of the right beam 7 is a "J" shape. This design can ensure the overall structural strength of the battery pack while avoiding other system pipelines of the vehicle.

[0043] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made according to the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.

Claims

1. A power battery module, comprising a lower housing (1) and a battery cell (2), characterized in that: The lower housing (1) comprises a bottom plate (3), a front side beam (4), a rear side beam (5), a left side beam (6) and a right side beam (7); the front side beam (4), the rear side beam (5), the left side beam (6) and the right side beam (7) are respectively fixed on four sides of the bottom plate (3); the battery cell (2) is placed on the bottom plate (3); a lateral pressure plate (8) is provided on the bottom plate (3); and a plurality of first pressure strips (9) are provided on the top of the battery cell (2).

2. The power battery module according to claim 1, characterized in that: A plurality of limiting beams (10) are fixedly arranged at equal intervals on the top surface of the bottom plate (3), a mounting groove (11) is formed between two adjacent limiting beams (10), the width of the mounting groove (11) is equal to the length of the battery cell (2), and insulating paper is pasted on the limiting beams (10).

3. The power battery module according to claim 2, characterized in that: The heat dissipation device also includes a heat dissipation device, which includes a liquid-cooling flat tube (12), a first connecting tube (13) and a second connecting tube (14). The number of the liquid-cooling flat tubes (12) is multiple, and all of the liquid-cooling flat tubes (12) are arranged at the same height and are parallel to each other. The first connecting tube (13) and the second connecting tube (14) are located at the same end of the liquid-cooling flat tube (12). The first connecting tube (13) is connected to the liquid inlets of all of the liquid-cooling flat tubes (12), and the second connecting tube (14) is connected to the liquid outlets of all of the liquid-cooling flat tubes (12).

4. The power battery module according to claim 3, characterized in that: Two rows of battery cells (2) are arranged between two adjacent liquid-cooling flat tubes (12), and heat-conductive silica gel is filled between the side walls of the liquid-cooling flat tubes (12) and the side walls of the battery cells (2).

5. The power battery module according to claim 4, characterized in that: The lateral pressure plate (8) is fixedly mounted on one end of the bottom plate (3) close to the front side beam (4).

6. The power battery module according to claim 1, characterized in that: A plurality of threaded holes are respectively provided on the left and right sides of the bottom plate (3), and the two ends of the first pressure strip (9) are respectively connected to the bottom plate (3) via first connecting rods.

7. The power battery module according to claim 6, characterized in that: The cross-sectional shape of the first pressure strip (9) is a "T" shape.

8. The power battery module according to claim 7, characterized in that: It also comprises two second pressure strips (15), wherein the second pressure strips (15) have an "L"-shaped limiting surface, and the two ends of the second pressure strips (15) are connected to the bottom plate (3) via a second connecting rod.

9. The power battery module according to claim 1, characterized in that: The cross-sectional shape of the right side beam (7) is a "J" shape.

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