CN216354511U - Lower shell, battery pack and power device - Google Patents

Abstract

The utility model discloses a lower shell, a battery pack and a power device. This lower casing includes: a base plate; the frame is fixedly wound on the outer periphery of the bottom plate, the frame and the bottom plate surround an installation space, and the frame is made of a first material; the module support is fixed on the bottom plate and located in the installation space, two ends of the module support are fixed with the frame, a module fixing position is arranged on the module support, the module support is made of a second material, and the strength of the first material is smaller than that of the second material. According to the lower shell, the module bracket is made of the second material with higher strength, so that the module bracket can be ensured to have better strength and rigidity.

Description

Lower case, battery pack and power unit

technical field

The utility model relates to the technical field of batteries, in particular to a lower casing, a battery pack having the lower casing, and a power device having the battery pack.

Background technique

In the related art, the lower casing is formed of aluminum material by tailor welding, which results in poor strength of the lower casing, and the welding process results in a large deformation of the lower casing. The welding process reduces the performance of the aluminum material by about 30%. Secondly, during the transportation of the lower shell, the welding seam has the risk of cracking, and the air tightness problem caused by the cracking of the welding seam is not easy to check. In addition, the consistency of the welding seam is poor. Poor aesthetics.

Utility model content

The present invention aims to solve one of the above-mentioned technical problems in the prior art at least to a certain extent. To this end, the present utility model proposes a lower casing, the strength of which is improved.

The utility model also provides a battery pack with the above-mentioned lower casing.

The utility model also provides a power device with the above-mentioned battery pack.

The lower casing according to the embodiment of the present invention includes: a bottom plate; a frame, the frame is fixed around the outer periphery of the bottom plate, and the frame and the bottom plate enclose an installation space, and the frame is made of a first material a frame formed; a module bracket, the module bracket is fixed on the bottom plate and is located in the installation space, the two ends of the module bracket are also fixed with the frame, and the module bracket is provided with The module is fixed in position, the module bracket is a bracket made of a second material, and the strength of the first material is smaller than that of the second material.

According to the lower casing of the embodiment of the present invention, the module bracket is made of the second material with higher strength, which can ensure the better strength of the module bracket.

According to some embodiments of the present invention, the module bracket has a main flange of the bracket, and the main flange of the bracket and the bottom plate are welded and fixed by a plurality of first welding points.

According to some embodiments of the present invention, the lower casing further includes a beam, the beam and the module bracket are arranged to cross, and the two ends of the beam and the frame are adapted to pass through a switch brackets are connected.

Specifically, the adapter bracket includes: a first flange and a second flange, the first flange is suitable for fitting with the beam, the first flange is provided with a first fixing hole, the first flange is A fastener passes through the first fixing hole and is fastened to the beam, the second flange is suitable for fitting with the frame, the second flange is provided with a second fixing hole, the third flange is Two fasteners are fastened to the beam after passing through the second fixing hole.

Further, there are a plurality of the module brackets, and the plurality of the module brackets include a middle bracket and an edge bracket, and the sides of the middle bracket are suitable for being separated from the frame and the edge brackets. The side edge of the edge bracket is suitable for fitting with the frame, and the adapter bracket further includes: a third flange, the third flange is suitable for fitting with the edge bracket, and the third flange is on the A third fixing hole is opened, and a third fastener is fastened to the edge bracket after passing through the third fixing hole.

Further, a plurality of the module brackets include at least a middle bracket, the side of the middle bracket is suitable for being separated from the frame, and the middle bracket is also separated from the edge bracket. The beam has a flange of the beam, and the flange of the beam and the bottom plate are welded and fixed by a plurality of second welding points.

According to some embodiments of the present invention, the beam is a beam made of a second material.

According to some embodiments of the present invention, the first material is aluminum and the second material is steel.

The battery pack according to the embodiment of the second aspect of the present invention includes: a battery module and the above-mentioned lower casing, and the battery module is fixed to the module fixing position by a fourth fastener.

According to the battery pack of the embodiment of the present invention, the lower case has high strength, which is beneficial to improve the service life of the battery pack.

The power plant according to the embodiment of the third aspect of the present invention includes the above-mentioned battery pack.

According to the power plant of the embodiment of the present invention, the battery pack adopts the above-mentioned lower casing, so that the service life of the battery pack is prolonged, so that frequent replacement or maintenance of the battery pack is unnecessary, and the service life of the power plant is prolonged.

Additional aspects and advantages of the invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or learned by practice of the invention.

Description of drawings

1 is a perspective view of a lower casing according to an embodiment of the present invention;

Fig. 2 is a partial enlarged schematic diagram at A in Fig. 1;

3 is a top view of a lower casing according to an embodiment of the present invention;

Fig. 4 is B-B sectional view in Fig. 3;

FIG. 5 is an enlarged schematic diagram of a part at C in FIG. 4 .

Reference number:

Lower shell 10, bottom plate 1, frame 2, module bracket 3, edge bracket 31, middle bracket 32, module fixing position 33, bracket main flange 34, bracket auxiliary flange 35, beam 4, beam flange 41, The shoulder 42, the adapter bracket 5, the first flange 51, the second flange 52, the third flange 53, the first fastener 61, the second fastener 62, the third fastener 63, the fifth fastener Fastener 64 , first welding point 71 , second welding point 72 .

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to be used to explain the present invention, but should not be construed as a limitation of the present invention.

In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", The orientation or positional relationship indicated by "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings , is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present utility model, unless otherwise expressly specified and limited, the terms "installation", "connection", "connection", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integration; it can be mechanical connection, electrical connection or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal communication between two elements or the interaction relationship between the two elements . For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

The lower casing 10 according to the embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 5 .

1 and 3, the lower casing 10 according to the embodiment of the present invention may include: a bottom plate 1, a frame 2 and a module bracket 3, the frame 2 is fixed around the outer periphery of the bottom plate 1, and the frame 2 and the bottom plate 1 encloses the installation space.

Specifically, the frame 2 is arranged around the outer periphery of the bottom plate 1 in a full circle. The frame 2 may enclose a quadrilateral frame, or may enclose a frame such as a circle, an ellipse, or a triangle. The quadrilateral frame can be formed by welding four sub-frames. In the embodiment shown in FIG. 1 and FIG. 3 , the frame 2 is surrounded by a rectangular frame. The frame 2 has a certain height, and the frame 2 is located on the same side of the base plate 1, so that the installation space enclosed between the frame 2 and the base plate 1 has a certain depth, which is convenient for the battery module to be installed in the installation space.

In some embodiments, the frame 2 and the bottom plate 1 can be fixedly connected by welding. In other embodiments, as shown in FIGS. 3 to 5 , the frame 2 and the bottom plate 1 can also be detachably connected through the fifth fastener 64 . This connection method does not generate welding stress and can reduce the The deformation of the frame 2 and the bottom plate 1. Optionally, the fifth fastener 64 may be a threaded fastener such as a bolt, which is convenient to assemble and disassemble.

The module bracket 3 is fixed on the bottom plate 1, and the module bracket 3 is located in the installation space, and the two ends of the module bracket 3 are also fixed with the frame 2, so that the position of the module bracket 3 in the installation space is fixed, and the module The bracket 3 is not easy to shake. The module bracket 3 and the frame 2 can be directly connected and fixed by welding, or indirectly connected and fixed by using an adapter.

The module bracket 3 is provided with a module fixing position 33 , and the battery module is suitable for being fixed at the module fixing position 33 , so as to realize the installation of the battery module in the lower casing 10 and effectively prevent the battery module from shaking.

In some embodiments, the height of the battery module may be greater than the depth of the installation space; of course, in other embodiments, the height of the battery module may also be smaller than the depth of the installation space; or, in other embodiments, the battery The height of the module can also be equal to the depth of the installation space.

The frame 2 is a frame made of a first material, and the module bracket 3 is a frame made of a second material, and the strength of the first material is lower than that of the second material. Specifically, the strength of the part made with the first material is less than the strength of the part made with the second material when making parts of the same shape. The module bracket 3 is made of a second material with higher strength, which can make the module bracket 3 have higher strength, thereby improving the support force of the module bracket 3 to the battery module, thereby improving the battery module and the lower case. 10 connection strength. In addition, the module bracket 3 is made of a second material with higher strength, which can also ensure that the module bracket 3 has better rigidity and is not easily deformed.

According to the lower casing 10 of the embodiment of the present invention, the module bracket 3 is made of a second material with higher strength, which can ensure the module bracket 3 has better strength and rigidity, thereby improving the module bracket 3 to the battery module. support strength and support stiffness.

In some embodiments, the density of the first material is less than the density of the second material. In this way, the frame 2 is made of a first material with a lower density and lower strength, and the module bracket 3 is made of a second material with a higher density and higher strength, which can ensure that the frame 2 is lighter in weight, and the module bracket 3 is stronger.

In some embodiments, the module bracket 3 and the base plate 1 can be fixed by spot welding. Referring to FIGS. 1 and 3 , the module bracket 3 has a bracket main flange 34 , the bracket main flange 34 is attached to the bottom plate 1 , and a plurality of first welding points 71 are passed between the bracket main flange 34 and the bottom plate 1 . Welding is achieved. The plurality of first solder joints 71 are dispersedly arranged along the length direction of the module bracket 3, so that in the entire length direction of the module bracket 3, there are fixed first solder joints 71 between the module bracket 3 and the bottom plate 1, This helps to improve the firmness of the welding. Compared with the welding seam, the spot welding method makes the welding stress smaller, the deformation at the welding position is smaller, and the module fixing position 33 on the module bracket 3 is easy to control. In addition, during transportation, the solder joints are not easily cracked, so that the air tightness of the lower casing 10 is better. In addition, the solder joints have good consistency and are more beautiful, and the impact of spot welding on material properties is also small.

In some embodiments, as shown in FIGS. 1 to 3 , the lower casing 10 may further include a beam 4 , the beam 4 and the module bracket 3 are arranged across the module bracket 3 , and the beam 4 is arranged across the module bracket 3 . The beam 4 has a shoulder 42, and the module bracket 3 has a bracket auxiliary flange 35 pressed on the shoulder 42. The bracket auxiliary flange 35 and the shoulder 42 can be fixed by welding, or can be fixed by means of fasteners. It is beneficial to improve the rigidity of the lower casing 10 .

Optionally, the beam 4 and the module bracket 3 can be arranged vertically.

The two ends of the beam 4 and the frame 2 are adapted to be connected by an adapter bracket 5 . Specifically, as shown in FIGS. 1-2 , the adapter bracket 5 may include a first flange 51 and a second flange 52 , wherein the first flange 51 is suitable for fitting with the beam 4 , and the first flange 51 A first fixing hole is opened on the top, and the first fastener 61 is fastened to the beam 4 after passing through the first fixing hole. The second flange 52 is suitable for fitting with the frame 2 , a second fixing hole is formed on the second flange 52 , and the second fastener 62 is fastened to the beam 4 after passing through the second fixing hole. That is to say, the adapter bracket 5 plays the role of connecting the beam 4 and the frame 2 . In this way, the beam 4 and the frame 2 are not directly connected by welding, but the cold connection is achieved through the adapter bracket 5 and the first fastener 61 and the second fastener 62, thereby avoiding the deformation problem caused by welding, and the material The performance is not easy to reduce, and the dimensional accuracy is easier to control.

In some embodiments, a threaded hole may be provided on the beam 4 corresponding to the position of the first fixing hole, the first fastener 61 may be a screw, and the screw is screwed into the threaded hole after passing through the first fixing hole.

In other embodiments, a rivet hole may be opened on the beam 4 corresponding to the position of the first fixing hole, the first fastener 61 may be a rivet, and the rivet passes through the first fixing hole and the rivet hole on the beam 4 at the same time.

In some embodiments, a threaded hole may be formed on the frame 2 corresponding to the position of the second fixing hole, the second fastener 62 may be a screw, and the screw passes through the second fixing hole and is screwed into the threaded hole.

In other embodiments, a rivet hole may be formed on the frame 2 corresponding to the position of the second fixing hole, the second fastener 62 may be a rivet, and the rivet passes through the second fixing hole and the rivet hole on the frame 2 at the same time.

Further, there are a plurality of module brackets 3 . Referring to FIG. 1 and FIG. 3 , the plurality of module brackets 3 include at least edge brackets 31 . It can also include a third flange 53, the third flange 53 is suitable for fitting with the edge bracket 31, the third flange 53 is provided with a third fixing hole, and the third fastener 63 passes through the third fixing hole and then tightens. fixed to the edge bracket 31 .

In some embodiments, a threaded hole may be formed on the edge bracket 31 corresponding to the position of the third fixing hole, the third fastener 63 may be a screw, and the screw passes through the third fixing hole and is screwed into the threaded hole.

In other embodiments, a rivet hole may be opened on the edge bracket 31 corresponding to the position of the third fixing hole, the third fastener 63 may be a rivet, and the rivet passes through the third fixing hole and the rivet hole on the edge bracket 31 at the same time .

Optionally, the adapter bracket 5 may be a sheet metal bent part, so that the strength of the adapter bracket 5 is good, and the forming process is simple, saving materials.

1 and 3, the beam 4 has a beam flange 41, the beam flange 41 is attached to the bottom plate 1, and the beam flange 41 and the bottom plate 1 are welded and fixed by a plurality of second welding points 72. The second welding points 72 are distributed along the length direction of the beam 4, so that there are second welding points 72 for fixing between the beam 4 and the bottom plate 1 along the entire length direction of the beam 4, which is beneficial to improve the welding firmness degree. Compared with the welding seam, the spot welding method makes the welding stress smaller and the deformation at the welding position smaller. In addition, during transportation, the solder joints are not easily cracked, so that the air tightness of the lower casing 10 is better. In addition, the solder joints have good consistency and are more beautiful, and the impact of spot welding on material properties is also small.

Further, the plurality of module brackets 3 at least include a middle bracket 32 , the side of the middle bracket 32 is adapted to be separated from the frame 2 , and the middle bracket 32 is also separated from the edge bracket 31 . Alternatively, the intermediate support 32 and the edge support 31 may be arranged in parallel. When the frame 2 is a rectangular frame, there are two edge brackets 31 , the sides of the two edge brackets 31 are respectively attached to the frame 2 on the corresponding side, and the middle bracket 3 is located between the two edge brackets 31 .

Both the middle bracket 32 and the edge bracket 31 can be provided with module fixing positions 33 . In this way, the battery module straddles the middle bracket 32 and the edge bracket 31 , so that the installation of the battery module in the lower casing 10 is more stable.

Optionally, the beam 4 is a beam 4 made of the second material.

Optionally, the first material is aluminum and the second material is steel. That is to say, the frame 2 is an aluminum frame, the module bracket 3 is a steel frame, and the beam 4 is a steel beam. In this way, the lower casing 10 is a steel-aluminum hybrid structure, and the overall mechanical strength is better. Because the strength of steel sheet metal is much higher than that of aluminum material, according to the equivalent strength and other stiffness conversion, under the same strength, the volume of the steel part is smaller, and the lower shell 10 of this steel-aluminum hybrid structure has better volumetric energy density. In addition, the cost of steel is generally lower than the cost of aluminum, so the lower casing 10 of the steel-aluminum hybrid structure has obvious cost advantages compared to the traditional aluminum structure.

The battery pack according to the embodiment of the second aspect of the present invention may include: a battery module and the lower casing 10 of the above-mentioned embodiment, and the battery module is fixed to the module fixing position 33 by a fourth fastener.

In some embodiments, the module fixing position 33 may be a threaded hole, the fourth fastener may be a screw, and the screw passes through the mounting hole on the battery module and is then screwed into the threaded hole.

In other embodiments, the module fixing position 33 may be a rivet hole, the fourth fastener may be a rivet, and the rivet passes through the rivet hole on the battery module and the rivet hole on the module bracket 3 at the same time.

According to the battery pack of the embodiment of the present invention, the lower case 10 has high strength, which is beneficial to improve the service life of the battery pack.

The power plant according to the embodiment of the third aspect of the present invention includes the battery pack of the above embodiment.

According to the power plant of the embodiment of the present invention, the battery pack adopts the above-mentioned lower casing 10, so that the service life of the battery pack is prolonged, so that frequent replacement or maintenance of the battery pack is unnecessary, and the service life of the power plant is prolonged.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., means a specific feature described in connection with the embodiment or example, A structure, material, or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limitations of the present invention, and those of ordinary skill in the art are within the scope of the present invention Variations, modifications, substitutions and variations can be made to the above-described embodiments.

Claims (10)

1. A lower housing, comprising:

a base plate (1);

the frame (2) is fixedly wound on the outer periphery of the bottom plate (1), the frame (2) and the bottom plate (1) enclose an installation space, and the frame (2) is made of a first material;

module support (3), module support (3) are fixed just be located on bottom plate (1) in the installation space, the both ends of module support (3) still with frame (2) are fixed, be provided with module fixed position (33) on module support (3), module support (3) are the support that the second material made, the intensity of first material is less than the intensity of second material.

2. The lower shell according to claim 1, characterized in that the module bracket (3) has a bracket main flange (34), and the bracket main flange (34) is welded and fixed with the bottom plate (1) through a plurality of first welding points (71).

3. The lower case according to claim 1, further comprising a cross member (4), wherein the cross member (4) is disposed across the module support (3), and both ends of the cross member (4) are adapted to be connected to the side frames (2) through a transfer support (5).

4. Lower shell according to claim 3, characterized in that said transition bracket (5) comprises: the first flanging (51) is suitable for being attached to the cross beam (4), a first fixing hole is formed in the first flanging (51), a first fastener (61) penetrates through the first fixing hole and then is fastened to the cross beam (4), the second flanging (52) is suitable for being attached to the frame (2), a second fixing hole is formed in the second flanging (52), and a second fastener (62) penetrates through the second fixing hole and then is fastened to the cross beam (4).

5. The lower case according to claim 4, wherein the module holders (3) are plural, the plural module holders (3) include a middle holder (32) and an edge holder (31), a side of the middle holder (32) is adapted to be separated from the bezel (2) and the edge holder (31), a side of the edge holder (31) is adapted to be engaged with the bezel (2), and the transfer holder (5) further includes: the third flanging (53) is suitable for being attached to the edge support (31), a third fixing hole is formed in the third flanging (53), and a third fastening piece (63) penetrates through the third fixing hole and then is fastened to the edge support (31).

6. The lower shell according to claim 3, wherein the cross beam (4) has a cross beam flange (41), and the cross beam flange (41) is welded and fixed with the bottom plate (1) through a plurality of second welding points (72).

7. Lower shell according to claim 3, characterized in that the cross-beam (4) is a cross-beam of the second material.

8. The lower shell of any of claims 1-7, wherein the first material is aluminum and the second material is steel.

9. A battery pack, comprising: the lower case of any one of claims 1 to 8, and a battery module fixed to the module fixing place (33) by a fourth fastening member.

10. A power plant comprising the battery pack of claim 9.

Images