WO2022268033A1

WO2022268033A1 - Case, battery pack, and vehicle

Info

Publication number: WO2022268033A1
Application number: PCT/CN2022/099888
Authority: WO
Inventors: 何为; 万龙; 李建强
Original assignee: 比亚迪股份有限公司
Priority date: 2021-06-25
Filing date: 2022-06-20
Publication date: 2022-12-29
Also published as: CN215451619U

Abstract

Disclosed are a case, a battery pack, and a vehicle. The case is suitable for a battery pack and comprises a bottom plate and an enclosure. The enclosure is defined by vehicle frame side members. The enclosure is disposed on one side of the bottom plate. The enclosure and the side surface of the bottom plate define a mounting space used for mounting battery cells.

Description

A box body, a battery pack and a vehicle

Cross References to Related Applications

This application is based on a Chinese patent application with application number 202121450524.2 and a filing date of June 25, 2021, and claims the priority of this Chinese patent application. The entire content of this Chinese patent application is hereby incorporated by reference into this application.

technical field

The present application relates to the technical field of battery packs, in particular to a case, a battery pack and a vehicle.

Background technique

High integration is an important trend in the development of vehicle power battery packs. Under this trend, the existing technology is mainly reflected in the CTP (Cell to Pack) technology without modules. This technology is based on the original power On the basis of the battery pack, the integration level is improved by canceling the module.

In related technologies, in terms of integration, the existing integrated power battery pack using CTP technology is still at the level of the battery pack. Although a high degree of integration has been achieved at the level of the power battery pack, it has not yet achieved a higher level of integration. , so there is still room for further improvement and improvement in the integration level for battery packs.

Contents of the invention

The technical problem to be solved in this application is to provide a battery pack box for the technical problem that the integration degree of the existing battery pack box body is not high enough, so as to improve the integration degree of the battery pack box body and achieve a higher level level of integration.

The first aspect of the present application provides a box body. The box body includes a bottom plate and a surrounding frame. The enclosure is formed by enclosing the side beams of the vehicle frame. The fence is arranged on one side of the bottom plate and defines an installation groove for installing the electric core with the side surface of the bottom plate.

Further, the frame side beam includes a first frame beam, a first frame rail, a second frame beam, and a second frame rail. The first vehicle frame beam, the first vehicle frame longitudinal beam, the second vehicle frame beam and the second vehicle frame longitudinal beam enclose in turn to form an enclosure.

Further, both the bottom plate and the side beams of the vehicle frame are made of composite materials.

Further, both the base plate and the frame side beams include multiple layers of raw materials.

Further, in the multi-layer raw material layers, the laying areas and/or angles of at least two raw material layers are different.

Further, the raw material layer includes a composite resin matrix and fiber reinforcement.

Further, the surrounding frame is an integrated structure formed by side beams of the vehicle frame.

The second aspect of the present application provides a battery pack, the battery pack includes the casing according to any one of the first aspect above and the battery cell, and the battery cell is accommodated in the installation groove of the box body.

A third aspect of the present application provides a vehicle, which includes the battery pack of the second aspect above.

The box body for the battery pack provided by the present application specifically includes a bottom plate and an enclosure formed by enclosing the side beams of the vehicle frame. The fence is arranged on the bottom plate. The surrounding frame and the bottom plate form an installation groove for installing the electric core, so that the electric core can be accommodated in the installation groove. This application promotes the idea of integration to a higher level of the car body to realize, using the frame side beam of the car body itself and the bottom plate to cooperate as the cell installation cavity, and the frame side beam and the battery package structure as one The frame side beam not only plays the role of enveloping and encapsulating internal batteries and other components, but also serves as a part of the frame structure. The bottom plate and the surrounding frame are directly formed to install and place internal batteries and other components. On the one hand, it reduces the material cost and complexity of separately installing an independent battery pack. On the other hand, it realizes the height of the box on the highest level. The integrated design can improve the performance of the whole vehicle, and the higher integrated box can realize the improvement of all aspects of efficiency, and the reduction of the overall components is also conducive to the improvement of the efficiency of mass production in the later stage.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings that need to be used in the descriptions of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are only for the present application For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without paying creative efforts.

Fig. 1 is a structural schematic diagram provided by an embodiment of the box body of the present application;

Fig. 2 is a schematic diagram of another structure provided by the battery pack according to an embodiment of the present application;

Fig. 3 is a schematic structural view of a raw material layer of a box body including a resin matrix and a fiber reinforcement according to an embodiment of the present application.

Wherein, the reference signs in the instructions are as follows:

1-enclosure; 11-first frame beam; 12-first frame longitudinal beam; 13-second frame beam; 14-second frame longitudinal beam; 15-bottom plate;

2-cell;

A-raw material layer; A1-resin matrix; A2-fiber reinforcement.

detailed description

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application.

It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

It is to be understood that the terms "length", "width", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, rather than indicating or implying No device or element must have a particular orientation, be constructed, and operate in a particular orientation, and thus should not be construed as limiting the application.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present application, "plurality" means two or more, unless otherwise specifically defined.

Example 1

It should be noted that high integration is an important trend in the development of power battery packs for electric vehicles. Currently, this trend is mainly reflected in the CTP (Cell to Pack) technology without modules. This technology On the basis of the original power battery pack, the integration level is improved by canceling the module, so as to achieve the improvement of the overall energy density to a certain extent. However, in terms of integration, the existing integrated power battery packs using CTP technology are still at the level of battery packs. There is room for further improvement and improvement; in addition, the boxes used for battery packs in existing vehicles are made of metal materials. There is still room for further improvement in terms of performance. And in terms of the connection method, the mechanical connection method adopted by the battery pack box made of the existing metal material is also an aspect that needs to be improved in the integration level, and it also brings additional assembly workload. On the other hand, the use of mechanical connections generally requires local reinforcement at the corresponding connections and the use of additional parts and connections including high-strength connections with larger dimensions. These measures make the weight of the currently used mechanical connections at the corresponding positions At the same time, the local stress concentration at these parts is also an important aspect that leads to crack initiation/propagation at the corresponding positions and reduces reliability. In order to solve the above problems, the design idea of the present application has been developed. Please refer to Fig. 1-3 together for details. The box example provided by the present application will be further described in detail below.

In one embodiment, as shown in FIG. 1 and FIG. 2 , a box body is provided, which includes a bottom plate 15 and a frame 1 formed by enclosing the side beams of the vehicle frame. The frame 1 is arranged on the bottom plate 15 One side, and an installation slot for installing the battery core is formed between the enclosure 1 and the side of the bottom plate.

Among them, it can be understood that the frame side beams required for the enclosure 1 formed by the above-mentioned frame side beams can be specifically formed by any part of the vehicle frame structure surrounded by side beams, which are not specifically described in this application. Do limited.

The above-mentioned surrounding frame 1 is a part of the frame structure. Through the above design, it is equivalent to installing the battery cell 2 in the frame structure to realize the integration of the box body and the frame structure. Among them, the beams and longitudinal beams around the frame structure The beam can not only play the role of wrapping and encapsulating the internal electric core 2 and other components, but also serves as a part of the frame, and the bottom plate 15 at the bottom of the frame structure can directly install and place the internal electric core 2 and other components, which can further improve the stability of the vehicle. Integration of frame structure and cell 2.

In one embodiment, as shown in FIG. 1, the above-mentioned frame side beams include a first frame beam 11, a first frame rail 12, a second frame beam 13, and a second frame rail 14; A vehicle frame beam 11, a first vehicle frame longitudinal beam 12, a second vehicle frame beam 13 and a second vehicle frame longitudinal beam 14 enclose in sequence to form an enclosure 1, that is, one end of the first vehicle frame beam 11 is fixed to the second vehicle frame beam. On one end of a frame rail 12, the other end of the first frame rail 11 is fixed on one end of the second frame rail 14; one end of the second frame rail 13 is fixed on the first frame rail 12 On the other end, the other end of the second frame beam 13 is fixed on the other end of the second frame longitudinal beam 14, thus forming the enclosure 1, and further, the bottom plate 15 is fixedly installed on the bottom of the enclosure 1, which can be specifically achieved by But not limited to, the bottom plate 15 is fixed to the bottom of the frame 1 by welding process, and the frame 1 and the bottom plate 15 form a mounting groove for installing the battery cell 2 .

In one embodiment, the bottom plate and each side beam of the vehicle frame are made of composite materials.

In the above-mentioned embodiment, by making the bottom plate and each side beam of the vehicle frame out of composite materials, compared with the box body of traditional metal materials, the specific strength and specific stiffness of composite materials are significantly greater than those of metal materials, and have the integrated structure of materials. In practical applications, better structural efficiency can be achieved through optimization of material systems or layups. The integrated design of the box body and the frame structure can also meet the design requirements of the car body and battery pack at the same time through the same component, and the overall molding process of composite materials can also avoid many shortcomings of the traditional connection method. Therefore, the box body of the above embodiment not only has excellent structural efficiency, but also greatly improves the goals of light weight and high strength.

At the same time, the higher structural efficiency provides more and safe space for related components such as the battery cell 2 carried, so that the related performance of the vehicle can be further improved, not only can further improve the specific strength and specific stiffness of the box, and Further reduce the weight of the box body, so as to realize the light weight of the box body, thereby further reducing the weight of the whole vehicle, and improving the safety performance of the electric vehicle. In addition, the box body can be used as the frame of the vehicle, which can further improve the The integration of battery cell 2 reduces the overall components and further improves the efficiency of mass production in the later stage.

In addition, compared with traditional metal materials, composite materials have excellent anti-fatigue and corrosion resistance, which makes the reliability and durability of this solution greatly improved compared with the existing technology, so as to achieve a longer service life of related structures .

In an embodiment, the bottom plate or each side beam of the vehicle frame may also be made of composite materials, which is not limited in this application.

In one embodiment, the floor and frame side rails each comprise multiple plies of material. As shown in FIG. 3 , taking the first frame rail 12 as an example, the composite material of the first frame rail 12 includes multiple raw material layers A. As shown in FIG. Wherein, each raw material layer A is composited by resin matrix A1 and fiber reinforcement A2.

The bottom plate, the frame beam and the frame longitudinal beam in the above embodiment are formed by selecting the raw material layer A compounded by the resin matrix A1 and the fiber reinforcement A2, and setting multiple layers by compounding the resin matrix A1 and the fiber reinforcement A2. The formed raw material layer A can not only reduce the weight of the box body, but also further enhance the strength of the box body, improve the reliability and stability of the box body, and thus provide the safety of the box body to the battery cell 2 .

In one embodiment, in the composite material, the laying area and/or angle of each raw material layer A are different. Wherein, as shown in FIG. 3 , based on the fact that the area of each raw material layer A is different, the composite material formed by laminating multiple layers of raw material layers A may present a stepped structure as a whole, wherein the first vehicle frame longitudinal beam 12 is For example, the composite material formed by laminating the raw material layers A of the first frame rail 12 has a stepped structure, which further reduces the weight and cost of the frame. Alternatively, the laying angles of the laying area of each raw material layer A are also different, so as to increase the variety of laying materials and provide more flexible and diverse enclosures.

In an embodiment, the vehicle frame longitudinal beam and/or the vehicle frame cross member can also be set as a hollow structure, so as to further reduce the weight and cost of the vehicle frame.

In the above-mentioned embodiment, by setting the area of each raw material layer A of the vehicle frame longitudinal beam and/or vehicle frame beam to be different, the area of the raw material layer A can be reduced as a whole, so as to further reduce the weight of the vehicle frame structure. Because of reducing the weight of the box body, the weight of the whole vehicle is reduced.

It can be seen from the above examples that the overall material of the box body of the present application is made of composite materials. The continuous fiber reinforced resin-based composite materials are mostly used in composite materials at present. The composite is mainly reflected in the mesoscopic level of the material, and the overall structure is mainly It is composed of plate and shell structures. As shown in Figure 3, the board and shell structures that make up the whole are all laminated by laying multiple layers of raw materials, and each single layer is composed of fiber reinforcement and resin matrix at the mesoscopic level.

In one embodiment, the above-mentioned surrounding frame 1 is an integrated structure formed by the side beams of the vehicle frame. Exemplarily, the above-mentioned surrounding frame 1 can be integrally formed by, for example, hot press molding or liquid molding. Wherein, the first frame beam 11 , the first frame longitudinal beam 12 , the second frame beam 13 and the second frame longitudinal beam 14 can be integrally formed into the enclosure 1 by hot press molding or liquid molding.

The first frame beam 11 , the first frame longitudinal beam 12 , the second frame beam 13 and the second frame longitudinal beam 14 forming the surrounding frame can be set as hollow structures to further reduce the weight and cost of the frame. In the present application, the corresponding first frame beam 11, first frame longitudinal beam 12, second frame beam 13 and The second frame rail 14 is fixed.

It can be understood that co-bonding is also called adhesive co-curing, which means that one or more preforms that have been cured and formed and another or more uncured preforms are cured and bonded into a whole through an adhesive in a curing process. The process method of the piece. The co-curing process refers to a process in which two or more preforms are cured into an integral component through the same curing process. Secondary bonding refers to the process of joining two or more cured composite parts by bonding. In practical applications, appropriate process steps can be selected according to the actual scene, so that the first frame beam 11, the first frame rail 12, the second frame rail 13 and the second frame rail 14 can be integrally formed, so that Reduce the use of connectors and improve the integrity of the box.

In the above-mentioned embodiment, the enclosure 1 integrally formed by hot-pressurization or liquid molding can not only reduce the use of connectors, but also reduce the manufacturing cost. Compared with the existing solutions, the process of the above-mentioned embodiment realizes connection The reduction in the number of components will also effectively reduce the cost of assembly, post-maintenance and other links, while better reliability/durability is also an important factor for the reduction of related post-maintenance costs. Furthermore, compared with metal materials, composite materials also have certain advantages in terms of electrical conductivity and thermal conductivity, so this solution can also bring certain improvements in related functions such as insulation or heat preservation, so as to achieve a part of the structural and functional integration effect .

Example 2

In one embodiment, the present application also provides a battery pack, which includes the box body and the battery cell 2 in any one of the above-mentioned embodiment 1; wherein, as shown in FIG. 2 , the battery cell 2 is fixed Installed in the installation groove of the box body. Based on the case made of composite materials in the above-mentioned embodiment 1, the battery cell 2 in this embodiment is accommodated in the installation groove of the case, which can further realize the integration of the battery pack, improve the structural strength of the battery pack and reduce the The overall weight of the battery pack.

Example 3

The third aspect of the present application provides a vehicle. In one embodiment, the vehicle includes the battery pack of any one of the above-mentioned embodiment 2.

Based on the battery pack in Embodiment 2 above, the vehicle of this embodiment can further improve the overall strength of the vehicle and reduce the overall quality of the vehicle.

The above descriptions are only preferred embodiments of the application, and are not intended to limit the application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the application should be included in the protection of the application. within range.

In the description of this application, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", " The orientation or positional relationship indicated by "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" is Based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood For the limitation of this application.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present application, "plurality" means two or more, unless otherwise specifically defined.

In this application, terms such as "installation", "connection", "connection" and "fixation" should be interpreted in a broad sense, for example, it can be a fixed connection or a detachable connection, unless otherwise clearly specified and limited. , or integrated; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection or an indirect connection through an intermediary, it can be the internal communication of two components or the interaction relationship between two components . Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present application. The scope of the application is defined by the claims and their equivalents.

Claims

A box body suitable for a battery pack, wherein the box body includes a bottom plate and a surrounding frame, the surrounding frame is formed by enclosing the side beams of the vehicle frame, the surrounding frame is arranged on one side of the bottom plate, and the The surrounding frame and the side of the bottom plate define an installation slot for installing the electric core.
The box body according to claim 1, wherein the frame side beam comprises a first frame beam, a first frame rail, a second frame beam, and a second frame rail;

The first frame beam, the first frame rail, the second frame rail and the second frame rail enclose in turn to form the surrounding frame.
The box body according to claim 1 or 2, wherein, both the bottom plate and the side beam of the vehicle frame are made of composite materials.
The box of claim 3, wherein said floor and said side rails each comprise multiple layers of material.
The box body according to claim 4, wherein, among the multiple layers of the material layers, at least two layers of the material layers have different laying areas and/or angles.
A box as claimed in claim 4 or 5, wherein the raw material layer comprises a composite resin matrix and fiber reinforcement.
The box body according to any one of claims 1-6, wherein the surrounding frame is an integral structure formed by the side beams of the vehicle frame.
The box body according to claim 7, wherein the side beam of the vehicle frame is formed by hot pressing or liquid forming.
A battery pack, comprising the box body according to any one of claims 1-8 and the battery cell, the battery cell being accommodated in the installation groove of the box body.
A vehicle, wherein the vehicle includes the battery pack as claimed in claim 9 .