CN108511652A - Battery modules pallet and battery pack - Google Patents

Abstract

The application discloses a battery module tray and a battery pack for a double-layer module. The battery module tray includes a tray main body and a plurality of legs, the tray body and the plurality of legs form an accommodating space, the first layer of battery modules is located in the accommodating space, and the second layer of battery modules is located on the upper surface of the tray main body. That is, the battery module tray also includes: a strengthening structure for the main body of the tray, which is located on the lower surface of the main body of the tray, and is used to increase the strength of the main body of the tray; a strengthening structure for legs, which is located on multiple legs, and is used to increase the strength of the multiple legs; wherein, the tray The main body and a plurality of legs are integrated.

Description

Battery module tray and battery pack

technical field

The invention relates to the technical field of assembly, and more specifically, to a battery module tray and a battery pack for a double-layer module.

Background technique

At present, the global automobile industry is facing huge challenges of energy and environmental issues. Pure electric vehicles have high energy efficiency and less pollution to the environment, so they have become the direction of the future development of the automobile industry. As the core component of pure electric vehicles, the power battery pack's structural design and safety performance will directly affect the overall performance of pure electric vehicles. Since in pure electric vehicles, the installation space reserved for battery packs is small and irregular, in order to make full use of the limited installation space, it is necessary to arrange the battery modules in a double-layer structure. In the prior art, battery module trays are usually used to solve this problem.

FIG. 1 a shows a schematic structural diagram of a battery module tray in the prior art for assembling battery packs, and FIG. 1 b shows an enlarged schematic structural view of the supporting feet of the tray in FIG. 1 a . The battery module tray in the prior art includes a tray body 11 and a plurality of separate tray feet 12. When assembling a battery pack, it is first necessary to fix the tray body 11 and the tray feet 12 together with bolts, and then install the battery module. Thus, the battery modules are arranged in a double-layer structure.

However, in the prior art, battery module trays are mostly manufactured by sheet metal tailor welding. The battery module trays formed by manual blanking and machine bending have low consistency, uneven surface, and heavy weight. The production efficiency of the battery module tray is low, which is unfavorable for mass production.

The tray body 11 and the tray feet 12 are produced separately. When assembling the battery pack, the tray body 11 and the tray feet 12 need to be fixed together with bolts first, which takes more assembly time; the mounting holes 121 are located on the two baffles. Between the structures, there is the problem of inconvenient assembly; the use of bolts causes uneven stress on the main body of the tray 11, which reduces the service life of the battery module tray; because multiple tray feet 12 are separated, additional trays need to be produced The legs 12 increase the manufacturing cost.

In addition, in the prior art, the structure of the battery module tray is relatively simple, with only a small amount of reinforcing ribs, which causes the problem of low strength of the overall structure.

Contents of the invention

In view of this, the present disclosure provides a battery module tray and a battery pack for a double-layer module.

According to one aspect of the present invention, a battery module tray for a double-layer module is provided, including a tray main body and a plurality of legs, the tray body and the plurality of legs form an accommodation space, and the first layer of batteries The module is located in the accommodating space, and the battery module of the second layer is located on the upper surface of the tray main body. It is characterized in that the battery module tray also includes: a tray main reinforcement structure located on the lower surface of the tray main body, It is used to increase the strength of the main body of the tray; the supporting foot reinforcement structure is located on the plurality of supporting feet, and is used to increase the strength of the supporting feet; wherein, the main body of the tray is integrated with the plurality of supporting feet.

Preferably, each of the legs includes: a connecting portion connected to the tray main body, the connecting portion is plate-shaped, and forms a first preset angle with the tray main body; and a support portion is connected to the connecting portion , the supporting portion is plate-shaped and forms a second preset angle with the connecting portion.

Preferably, the leg reinforcement structure includes a first reinforcement structure, the first reinforcement structure is located on the first surface of the connection part and is connected to the support part.

Preferably, the first reinforcement structure is in the shape of a triangular plate; the length of the base of the first reinforcement structure matches the width of the support portion, and the base of the first reinforcement structure is connected to the support portion; The height of the first reinforcing structure matches the height of the connecting part.

Preferably, the foot reinforcement structure further includes a second reinforcement structure, the second reinforcement structure is disposed on the second surface of the connecting portion, and part of the second reinforcement structure is connected to the tray main body reinforcement structure.

Preferably, each of the supporting feet further includes: a tray positioning hole, located on the support part, for determining the position of the battery module tray; and tray fixing holes, located on both sides of the tray positioning hole, for for fixing the battery module tray.

Preferably, the tray body reinforcement structure is distributed on the lower surface of the tray body in a grid pattern.

Preferably, it further includes: a pallet beam, located at the edge of the pallet main body, integrated with the pallet main body and a plurality of feet; and a pallet beam reinforcement structure, distributed on the pallet beam, for increasing the strength of the pallet beam. strength.

Preferably, it also includes: a plurality of connection holes distributed on the pallet body and the pallet beam; and a connection hole reinforcement structure, the connection hole reinforcement structure surrounds the plurality of connection holes and is connected to the The main body of the tray strengthens the structural connection and is used to increase the strength of the connection hole.

Preferably, the tray body, the plurality of legs, the tray body reinforcing structure and the leg reinforcing structure are an integral structure formed by a high pressure casting process.

According to another aspect of the present invention, a battery pack is provided, including the above-mentioned battery module tray.

According to the battery module tray and battery pack for double-layer modules of the present invention, the storage space is formed by the main body of the tray and a plurality of feet, the first layer of battery modules is located in the storage space, and the second layer of batteries The module is located on the upper surface of the main body of the tray, achieving the purpose of arranging the battery module into a double-layer structure. Compared with the prior art, the main body of the battery module tray of the present invention is integrated with a plurality of legs without additional The production of tray feet does not need to use bolts to connect the tray body with multiple feet, which improves the consistency and surface smoothness of the battery module tray, reduces the weight of the battery module tray, and averages the stress on the tray body. At the same time, the production cost of the battery module tray is reduced, and the service life of the battery module tray is improved.

In addition, the battery module tray of the present invention is provided with a plurality of reinforcement structures at the tray body and the plurality of feet, which increases the overall strength of the battery module tray.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description only relate to some embodiments of the present invention, rather than limiting the present invention .

FIG. 1 a shows a schematic structural view of a battery module tray in the prior art for assembling a battery pack.

Fig. 1b shows an enlarged schematic view of the structure of the pallet foot part in Fig. 1a.

Fig. 2a shows a schematic structural diagram of a battery module tray according to an embodiment of the present invention.

Figure 2b shows a bottom view of Figure 2a.

3a to 3c show schematic diagrams of the reinforced structure of the battery module tray according to the embodiment of the present invention.

Fig. 4a and Fig. 4b show partial enlarged views of Fig. 3a.

Fig. 4c shows a partially enlarged view of Fig. 3b.

Fig. 4d shows a partially enlarged view of Fig. 3c.

FIG. 5 shows a schematic structural diagram of a battery module tray used for assembling a battery pack according to an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, but not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Fig. 2a shows a schematic structural diagram of a battery module tray according to an embodiment of the present invention, and Fig. 2b shows a bottom view of Fig. 2a.

As shown in Fig. 2a and Fig. 2b, the battery module tray of the embodiment of the present invention is an integrated structure formed by high pressure casting process. The hole 400 , the tray body reinforcement structure 500 , the tray foot reinforcement structure, the connection hole reinforcement structure 700 and the tray beam reinforcement structure 800 , wherein the tray foot reinforcement structure includes a first reinforcement structure 610 and a second reinforcement structure 620 . In the embodiment of the present invention, light alloy materials such as cast aluminum alloy and cast magnesium alloy are used to cast the battery module tray, and the reinforced structure can be realized by using reinforcing ribs.

A plurality of hollow areas 110 are provided on the tray main body 100, and the hollow areas 110 are used to reduce the weight of the battery module tray, thereby reducing the overall weight of the battery pack.

Each leg 200 includes a connection portion 210 and a support portion 220, the connection portion 210 and the support portion 220 are roughly plate-shaped, wherein each connection portion 210 is in the shape of an inverted trapezoid, and the long bases of each trapezoid are connected. The part has rounded corners; the shape of the supporting part 220 is a rectangle. The width of the short base of each trapezoid matches the length of the supporting portion 220, the connecting portion 210 is connected to the tray main body 100 at a first preset angle, the supporting portion 220 is connected to the connecting portion 210 at a second preset angle, and the first The preset angle is complementary to the second preset angle, so that the main body of the tray can be fixed on a horizontal plane. In some preferred embodiments, both the first preset angle and the second preset angle are 90 degrees. The support part 220 is provided with a tray positioning hole 221 and a tray fixing hole 222. The tray positioning hole 221 is located in the center of the support part and is used to determine the position of the battery module tray on the installation beam of the battery pack. The installation beam is provided with a tray positioning hole. The pins and tray fixing holes 222 are located on both sides of the tray positioning hole 221, and are used to fix the battery module tray on the installation beam of the battery pack, and the fixing method is bolted.

The pallet beam 300 is located on the edge of the pallet body 100, and a plurality of connection holes 400 are distributed on the pallet body 100 and the pallet beam 300, wherein the connection holes 400 on the pallet body 100 are distributed on the pallet body 100 avoiding the multiple hollow areas 110 .

The multiple connection holes 400 include: a fuse fixing hole 401 on the tray body, a battery management system (BATTERY MANAGEMENT SYSTEM, BMS) bracket fixing hole 402, a BMS fixing hole 403, and a module fixing hole 404 on the tray beam.

Figure 3a to Figure 3c show a schematic view of the reinforced structure of the battery module tray of the embodiment of the present invention, Figure 4a, Figure 4b shows a partial enlarged view of Figure 3a, Figure 4c shows a partial enlarged view of Figure 3b, Figure 4d An enlarged partial view of Fig. 3c is shown.

As shown in FIG. 3 a , the tray body reinforcement structure 500 is distributed on the lower surface of the tray body 100 in a grid shape, and avoids the hollow area 110 of the tray body 100 . The tray body reinforcement structure 500 is used to increase the strength of the tray body 100 .

As shown in Figures 3a, 4a and 4b, the connecting hole reinforcement structure 700 surrounds the plurality of connection holes 400 and is connected with the pallet body reinforcement structure 500 for increasing the strength of the connection holes. The pallet beam strengthening structure 800 is distributed on the pallet beam 300 for increasing the strength of the pallet beam 300 .

As shown in Figures 3b, 3c, 4c, and 4d, the leg strengthening structure is located on the plurality of legs 200 for increasing the strength of the plurality of legs. Specifically, the first reinforcement structure 610 is in the shape of a triangular plate, located on the first surface of the connection part 210 and connected to the support part 220, wherein the height of the first reinforcement structure 610 matches the height of the connection part 210, and the first reinforcement structure 610 The length of the bottom edge matches the width of the support portion 220, and the bottom edge is connected to the support portion 220. Furthermore, each leg 200 has two first reinforcement structures 610, which are arranged on both sides of the support portion 220 in parallel. . The second reinforcement structure 220 is disposed on the second surface of the connecting portion 210, and a part of the second reinforcement structure 620 is connected to the tray main body reinforcement structure 500. Further, each leg 200 has three second reinforcement structures 620 parallel to each other, and Evenly distributed on the second surface of the connecting portion 210 , wherein the second reinforcing structures 620 on both sides are connected to the tray main body reinforcing structure 500 . However, this embodiment is not limited thereto, and those skilled in the art may make other settings for the quantity and positions of the first reinforcing structures 610 and the second reinforcing structures 620 as required.

FIG. 5 shows a schematic structural diagram of a battery module tray used for assembling a battery pack according to an embodiment of the present invention.

As shown in FIG. 5 , the tray main body 100 and a plurality of feet 200 form an accommodating space, the first layer of battery modules can be located in the accommodating space, and the second layer of battery modules can be located on the upper surface of the tray main body 100 . Compared with the prior art in FIG. 1 , the height of the bottom surface of the support foot 200 from the pallet beam 300 is reduced by 1.6mm, and the connecting portion between the support foot 200 and the tray main body 100 is widened, making the battery pack more stable.

According to the battery module tray of the embodiment of the present invention, by adopting the high-pressure casting process, the production efficiency, the tolerance level of the casting, and the overall flatness are improved, the process is simplified, the surface roughness is improved, and the mechanical strength and bolt hole positioning are increased. Accuracy saves a lot of mechanical processing procedures and equipment, reduces production costs and development cycles.

According to the battery module tray of the embodiment of the present invention, reinforcement ribs are designed at the bottom of the battery module tray, the connection holes, the tray beams and the tray feet, which improves the overall strength of the battery module tray and increases the reliability. In addition, The reinforcing rib in the embodiment of the present invention does not need to occupy additional space, saving reserved space.

According to the battery module tray of the embodiment of the present invention, the weight of the battery module tray is reduced by using a light alloy material, and the energy density of the battery system is improved.

According to the battery module tray of the embodiment of the present invention, the support feet of the tray and the inner beams of the box are fixed by bolts, which improves the anti-vibration and impact resistance performance of the battery pack, thereby improving the reliability of the battery pack.

It should be noted that in this article, relational terms such as first and second etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Embodiments according to the present invention are described above, and these embodiments do not describe all details in detail, nor do they limit the invention to only the specific embodiments described. Obviously many modifications and variations are possible in light of the above description. This description selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and its modification on the basis of the present invention.

Claims (11)

1. A battery module tray for a double-layer module, comprising a tray main body and a plurality of legs, the tray body and the plurality of legs form an accommodating space, and the first layer of battery modules is located in the accommodating space In the space, the battery module of the second layer is located on the upper surface of the main body of the tray, and it is characterized in that the battery module tray also includes: The tray body reinforcement structure is located on the lower surface of the tray body and is used to increase the strength of the tray body; a leg strengthening structure, located on the plurality of legs, for increasing the strength of the plurality of legs; Wherein, the tray main body and the plurality of supporting feet are integrally structured. 2. The battery module tray according to claim 1, wherein each of the legs comprises: a connecting portion connected to the tray main body, the connecting portion is plate-shaped, and forms a first preset angle with the tray main body; and The supporting part is connected with the connecting part, the supporting part is plate-shaped, and forms a second preset angle with the connecting part. 3. The battery module tray according to claim 2, characterized in that, the leg reinforcement structure comprises a first reinforcement structure, the first reinforcement structure is located on the first surface of the connecting portion, and is connected to the support department connection. 4. The battery module tray according to claim 3, wherein the first reinforcement structure is in the shape of a triangular plate; The length of the bottom edge of the first reinforcement structure matches the width of the support portion, and the bottom edge of the first reinforcement structure is connected to the support portion; The height of the first reinforcing structure matches the height of the connecting part. 5. The battery module tray according to claim 3, characterized in that, the leg reinforcement structure further comprises a second reinforcement structure, the second reinforcement structure is arranged on the second surface of the connection part, part of the The second reinforcement structure is connected to the tray main body reinforcement structure. 6. The battery module tray according to claim 5, wherein each of the legs further comprises: Tray positioning holes, located on the support part, used to determine the position of the battery module tray; and The tray fixing holes are located on both sides of the tray positioning hole and are used to fix the battery module tray. 7. The battery module tray according to claim 1, wherein the reinforcement structure of the tray body is distributed on the lower surface of the tray body in a grid shape. 8. The battery module tray according to claim 1, further comprising: a pallet beam positioned at the edge of the pallet body and integral with the pallet body and a plurality of feet; and The pallet beam reinforcement structure is distributed on the pallet beam and used to increase the strength of the pallet beam. 9. The battery module tray according to claim 8, further comprising: a plurality of connecting holes distributed on the pallet body and the pallet beam; and A connection hole reinforcement structure, the connection hole reinforcement structure surrounds the plurality of connection holes and is connected with the tray main body reinforcement structure, for increasing the strength of the connection holes. 10. The battery module tray according to any one of claims 1-9, characterized in that, the tray body, the plurality of feet, the reinforcement structure of the tray body, and the reinforcement structure of the feet adopt a high-pressure casting process formed an integral structure. 11. A battery pack for a double-layer module, comprising the battery module tray according to any one of claims 1-9.