Battery pack and power device

Abstract

The utility model discloses a battery pack and power plant, said battery pack includes: box body and battery module, said box body forms the accommodation cavity, said battery module is provided in said accommodation cavity, said box body includes: bottom guard plate, middle frame and cold plate, said bottom guard plate is provided below said battery module, said middle frame is provided above said bottom guard plate, said middle frame is provided above said middle frame, said cold plate is provided below said battery module. The cold plate is arranged above the battery module, and the bottom protection plate, the middle frame and the cold plate sequentially penetrate through the bottom protection plate, the middle frame and the cold plate through fasteners and are detachably connected. According to the battery pack disclosed by the utility model, the cold plate is arranged at the upper part of the battery module, so that the heat dissipation area is ensured, the risk that the cold plate is impacted is reduced, the safety is improved, the cold plate replaces an upper cover, the upper cover of the battery pack and a pressing strip of the upper cover are saved, the number of parts of the battery pack is reduced, and the number of fasteners is reduced; the production cost is reduced, the production time is shortened, and the light weight of the battery pack is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a battery pack and a power device. Background Art

[0002] It is pointed out in the related art that the new energy vehicle industry is developing rapidly and has the momentum to gradually replace fuel vehicles. However, at present, the endurance, safety and cost of new energy vehicles are still the bottlenecks restricting their development. Before the battery chemical system is iterated and a technological breakthrough is achieved, the lightweight design, safety design and cost reduction design of the battery pack are the basic development routes of the entire industry.

[0003] At present, in order to meet the requirements of endurance and safety required by users, the battery pack often needs to be very large and has a complex structure, so the weight of the entire battery pack remains high. It is impossible to have all three of high endurance, high safety performance and simple structure with low cost. The battery pack of a vehicle with high endurance often has a large mass, a high cost, and due to its large structure and large power, its safety performance is not high; the battery pack with high safety performance has many protective measures, which means that the proportion of structural parts is larger, so the mass is very large and the cost is very high; the battery pack with a simple structure has a corresponding cost reduction, but its safety performance is greatly reduced. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, the utility model provides a battery pack with a high degree of lightweight and few components.

[0005] The utility model also provides a power device with the above battery pack.

[0006] The battery pack according to the first aspect of the utility model includes: a box body and a battery module. The box body is formed with a receiving cavity, and the battery module is arranged in the receiving cavity. The box body includes: a bottom guard plate, a middle frame and a cold plate. The bottom guard plate is arranged below the battery module, the cold plate is arranged above the battery module, and the bottom guard plate, the middle frame and the cold plate are detachably connected by fasteners passing through the bottom guard plate, the middle frame and the cold plate in sequence.

[0007] According to the battery pack of the utility model, by arranging the cold plate on the upper part of the battery module, while ensuring the heat dissipation area, the risk of the cold plate being impacted is reduced, the safety is improved, and the cold plate replaces the upper cover, saving the upper cover of the battery pack and the bead of the upper cover, reducing the number of components of the battery pack. The bottom guard plate, the middle frame and the cold plate are fixed by the same set of fasteners, reducing the number of fasteners, reducing the production cost, shortening the production time, and realizing the lightweight of the battery pack.

[0008] In some embodiments, the cold plate is formed with a first through hole, the middle frame is formed with a second through hole, and the bottom guard plate is formed with a third through hole. The first through hole penetrates the cold plate in the thickness direction of the cold plate, the second through hole penetrates the middle frame in the thickness direction of the middle frame, and the third through hole penetrates the bottom guard plate in the thickness direction of the bottom guard plate. The fastener sequentially extends into and out of the first through hole, the second through hole, and the third through hole.

[0009] In some embodiments, the battery pack further includes: a first seal and a second seal. The first seal is disposed between the cold plate and the middle frame, and the second seal is disposed between the bottom guard plate and the middle frame.

[0010] In some embodiments, the cold plate includes: a first plate and a second plate. The first plate and the second plate are stacked. A cooling flow channel is formed in the first plate. The first plate is formed with a water inlet and a water outlet, and both the water inlet and the water outlet are communicated with the cooling flow channel.

[0011] In some embodiments, the first plate is formed as a steel plate, and the second plate is formed as an aluminum plate.

[0012] In some embodiments, a polyvinyl chloride layer is provided on the surface of the bottom guard plate, and / or the bottom guard plate is a double-layer profile plate.

[0013] In some embodiments, the middle frame includes a rear side beam, a left side beam, a front side beam, and a right side beam that are sequentially connected. A longitudinal beam is connected between the rear side beam and the front side beam, and a cross beam is connected between the left side beam and the right side beam.

[0014] In some embodiments, the fastener includes: a bolt and a nut. The bolt is provided with a sealing ring, and the sealing ring abuts against the surface of the cold plate to seal the first through hole.

[0015] In some embodiments, the nut is disposed in the third through hole, and the end faces at both ends of the nut are flush with the two side surfaces of the bottom guard plate.

[0016] The power device according to the second aspect of the present invention includes the battery pack according to the first aspect of the present invention above.

[0017] By providing the battery pack according to the first aspect, the power device according to the present invention realizes the lightweight of the power device, reduces the production cost of the power device, and improves the safety of the power device.

[0018] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0019] Figure 1 is a schematic diagram of a battery pack according to an embodiment of the present invention;

[0020] Figure 2 is Figure 1 an exploded schematic diagram of the battery pack shown in

[0021] Figure 3 is Figure 2 a schematic diagram of the middle frame shown in

[0022] Figure 4 is Figure 2 a schematic diagram of the bolt shown in

[0023] Figure 5 is Figure 2 a schematic diagram of the battery module shown in

[0024] Figure 6 is Figure 2 a schematic diagram of the bottom guard plate shown in

[0025] Figure 7 is Figure 6 a partial cross-sectional schematic diagram of the bottom guard plate shown in

[0026] Figure 8 is Figure 6 a top view schematic diagram of the bottom guard plate shown in

[0027] Figure 9 is Figure 2 a schematic diagram of the cold plate shown in

[0028] Figure 10 is Figure 9 an exploded schematic diagram of the cold plate shown in

[0029] Figure 11 is Figure 1 a top view schematic diagram of the battery pack shown in

[0030] Figure 12 is Figure 11 a schematic diagram of the A-A cross-section of the battery pack shown in

[0031] Figure 13 is Figure 12 a partially enlarged cross-sectional schematic diagram of the battery pack shown in

[0032] Figure 14 is Figure 12 a partially enlarged cross-sectional schematic diagram of another part of the battery pack shown in

[0033] Reference numerals:

[0034] 100, battery pack;

[0035] 1. Box body; 11. Bottom guard plate; 111. Third through hole;

[0036] 12. Middle frame; 121. Second through hole; 122. Rear side beam; 123. Left side beam; 124. Front side beam; 125. Right side beam; 126. Longitudinal beam; 127. Cross beam; 1271. First connection hole;

[0037] 13. Cold plate; 131. First through hole; 132. First plate; 133. Second plate; 134. Second connection hole;

[0038] 2. Battery module; 21. End plate;

[0039] 3. Bolt; 31. Sealing ring;

[0040] 4. Nut; 5. First seal; 6. Second seal; 7. Rivet nut. Detailed implementation mode

[0041] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0042] Below, refer to Figures 1 - 14 Describe the battery pack 100 according to the embodiment of the first aspect of the present utility model.

[0043] As Figures 1 - 14 shown, the battery pack 100 according to the embodiment of the first aspect of the present utility model includes: a box body 1 and a battery module 2.

[0044] Specifically, the box body 1 forms an accommodation cavity, the battery module 2 is arranged in the accommodation cavity, the box body 1 includes: a bottom guard plate 11, a middle frame 12 and a cold plate 13. The bottom guard plate 11 is arranged below the battery module 2, the cold plate 13 is arranged above the battery module 2, and the bottom guard plate 11, the middle frame 12 and the cold plate 13 are detachably connected by fasteners passing through the bottom guard plate 11, the middle frame 12 and the cold plate 13 in sequence. Thus, the structure of the battery pack 100 is simple, the design is ingenious, and the safety factor is high.

[0045] According to the battery pack 100 of the embodiment of the present utility model, by arranging the cold plate 13 on the upper part of the battery module 2, while ensuring the heat dissipation area, the risk of the cold plate 13 being impacted is reduced, the safety is improved, and the cold plate 13 replaces the upper cover, saving the upper cover and the bead of the upper cover of the battery pack 100, reducing the number of components of the battery pack 100. The bottom guard plate 11, the middle frame 12 and the cold plate 13 are fixed by the same set of fasteners, reducing the number of fasteners, lowering the production cost, shortening the production time, and realizing the lightweight of the battery pack 100.

[0046] In some embodiments of the present utility model, as Figure 2 shown, the cold plate 13 is formed with a first through hole 131, the middle frame 12 is formed with a second through hole 121, and the bottom guard plate 11 is formed with a third through hole 111. The first through hole 131 penetrates the cold plate 13 in the thickness direction of the cold plate 13, the second through hole 121 penetrates the middle frame 12 in the thickness direction of the middle frame 12, and the third through hole 111 penetrates the bottom guard plate 11 in the thickness direction of the bottom guard plate 11. The fasteners sequentially extend into and pass through the first through hole 131, the second through hole 121 and the third through hole 111. Thus, the cold plate 13, the middle frame 12 and the bottom guard plate 11 are connected and fixed by the same set of fasteners, reducing the number of fasteners used, lowering the processing cost of the battery pack 100, and reducing the assembly working hours of the battery pack 100.

[0047] In some embodiments of the present utility model, as Figure 2 and Figure 14 shown, the battery pack 100 further includes: a first seal 5 and a second seal 6. The first seal 5 is disposed between the cold plate 13 and the middle frame 12, and the second seal 6 is disposed between the bottom guard plate 11 and the middle frame 12. Thus, the sealing effect of the box body 1 of the battery pack 100 is improved, and the sealing property in the accommodation cavity is ensured.

[0048] Furthermore, as Figure 13 shown, the rivet nut 7 is sleeved on the bolt 4.

[0049] In some embodiments of the present utility model, as Figure 9 and Figure 10 shown, the cold plate 13 includes: a first plate 132 and a second plate 133. The first plate 132 and the second plate 133 are stacked. A cooling flow channel is formed in the first plate 132. The first plate 132 is formed with a water inlet and a water outlet, and both the water inlet and the water outlet are communicated with the cooling flow channel. Thus, the structural strength of the cold plate 13 is improved, the protective performance of the cold plate 13 as the upper cover is ensured, and the space volume of the battery pack 100 is reduced.

[0050] Preferably, the first plate 132 is formed as a steel plate, the second plate 133 is formed as an aluminum plate, and a heat-insulating and fire-proof coating is sprayed on the upper surface of the cold plate 13.

[0051] Furthermore, preferably, the surface of the bottom guard plate 11 is provided with a polyvinyl chloride layer, and the bottom guard plate 11 is a double-layer profile plate. In this way, the stiffness of the bottom guard plate 11 is improved, the function of preventing stone impact is achieved, the sealing performance and corrosion resistance are enhanced, and while ensuring the lightweight of the battery pack 100, the safety of the battery pack 100 is guaranteed.

[0052] In some embodiments of the present invention, as Figure 3 shown, the middle frame 12 includes a rear side beam 122, a left side beam 123, a front side beam 124, and a right side beam 125 that are connected in sequence. A longitudinal beam 126 is connected between the rear side beam 122 and the front side beam 124, and a cross beam 127 is connected between the left side beam 123 and the right side beam 125. Thus, the structure of the box body 1 is simple, and the number of components is small, reducing the height of the battery pack 100, achieving the lightweight of the battery pack 100, and reducing the cost of the battery pack 100.

[0053] In some embodiments, end plates 21 are provided at both ends in the arrangement direction of the battery modules 2, as Figure 2 and Figure 3 shown. A first connection hole 1271 is formed on the cross beam 127, and a second connection hole 134 is formed on the cold plate 13. The cold plate 13 and the cross beam 127 are fixedly connected by a fastener passing through the first connection hole 1271 and the second connection hole 134, improving the structural stability of the battery pack 100.

[0054] In some embodiments of the present invention, the fastener includes: a bolt 3 and a nut 4, as Figure 4 shown. The bolt 3 is provided with a sealing ring 31, and the sealing ring 31 abuts against the surface of the cold plate 13 to seal the first through hole 131. Thus, while ensuring the connection stability of the box body 1 of the battery pack 100, the sealing performance of the accommodation cavity is guaranteed.

[0055] In some embodiments of the present invention, as Figure 7 shown, the nut 4 is disposed in the third through hole 111, and the end faces at both ends of the nut 4 are flush with the two side surfaces of the bottom guard plate 11. In this way, the bottom of the battery pack 100 is flat, shortening the height of the battery pack 100 and ensuring the sealing effect inside the battery pack 100.

[0056] The power device according to the second aspect embodiment of the present invention includes the battery pack 100 according to the first aspect embodiment of the present invention above.

[0057] The power device according to the embodiment of the present invention realizes the lightweight of the power device, reduces the production cost of the power device, and improves the safety of the power device by setting the battery pack 100 of the first aspect embodiment above.

[0058] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0059] 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 implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0060] In the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0061] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0062] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A box body and a battery module, wherein the box body is formed with a accommodating cavity, and the battery module is arranged in the accommodating cavity. The box body comprises: a bottom guard plate, a middle frame and a cold plate, wherein the bottom guard plate is arranged below the battery module, and the cold plate is arranged above the battery module. The bottom guard plate, the middle frame and the cold plate are detachably connected by fasteners that pass through the bottom guard plate, the middle frame and the cold plate in sequence.

2. The battery pack according to claim 1, characterized in that: The cold plate is formed with a first through hole, the middle frame is formed with a second through hole, and the bottom guard plate is formed with a third through hole. The first through hole penetrates the cold plate in the thickness direction of the cold plate, the second through hole penetrates the middle frame in the thickness direction of the middle frame, and the third through hole penetrates the bottom guard plate in the thickness direction of the bottom guard plate. The fastener extends into and passes through the first through hole, the second through hole, and the third through hole in sequence.

3. The battery pack according to claim 2, characterized in that: Also includes: A first seal and a second seal, wherein the first seal is disposed between the cold plate and the middle frame, and the second seal is disposed between the bottom guard plate and the middle frame.

4. The battery pack according to claim 3, characterized in that: The cold plate includes: a first plate and a second plate, the first plate and the second plate are stacked, a cooling channel is formed in the first plate, a water inlet and a water outlet are formed on the first plate, and the water inlet and the water outlet are both connected to the cooling channel.

5. The battery pack according to claim 4, characterized in that: The first plate is formed as a steel plate, and the second plate is formed as an aluminum plate.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The surface of the bottom guard plate is provided with a polyvinyl chloride layer, and / or the bottom guard plate is a double-layer profile plate.

7. The battery pack according to any one of claims 1 to 5, characterized in that: The middle frame includes a rear side beam, a left side beam, a front side beam and a right side beam which are connected in sequence. A longitudinal beam is connected between the rear side beam and the front side beam, and a transverse beam is connected between the left side beam and the right side beam.

8. The battery pack according to any one of claims 2 to 5, characterized in that: The fastener comprises: a bolt and a nut. The bolt is provided with a sealing ring. The sealing ring abuts against the surface of the cold plate to seal the first through hole.

9. The battery pack according to claim 8, characterized in that: The nut is arranged in the third through hole, and the end faces at both ends of the nut are arranged flush with the two side surfaces of the bottom guard plate.

10. A power device, characterized in that: A battery pack comprising any one of claims 1-9.

Images