WO2020252848A1

WO2020252848A1 - Power battery pack and vehicle

Info

Publication number: WO2020252848A1
Application number: PCT/CN2019/097480
Authority: WO
Inventors: 王隆兴; 王小龙; 郑卫鑫; 朱燕
Original assignee: 比亚迪股份有限公司
Priority date: 2019-06-21
Filing date: 2019-07-24
Publication date: 2020-12-24
Also published as: CN209766605U

Abstract

Disclosed are a power battery pack and a vehicle. The power battery pack comprises a tray and an upper cover, the tray comprising a side frame and a bottom plate, and the upper cover and the bottom plate being respectively connected to the upper end and the lower end of the side frame to define a battery accommodation chamber; a battery cell mounted in the battery accommodation chamber; a bottom protection plate connected to the lower end of the side frame and spaced apart from the bottom plate in the vertical direction; and a heat exchange plate sandwiched between the bottom protection plate and the bottom plate.

Description

Power battery pack and vehicle

Cross references to related applications

This application claims the priority of the Chinese patent application number "201920960285.1" filed by BYD Co., Ltd. on June 21, 2019 under the title of "Power Battery Pack and Vehicle", the entire content of which is incorporated into this application by reference. in.

Technical field

This application belongs to the technical field of power battery manufacturing, and specifically relates to a power battery pack and a vehicle having the power battery pack.

Background technique

The temperature distribution of the power battery pack has a great influence on its life and endurance. Among related technologies, the liquid-cooled heat exchange effect is good, and the heat management system of the power battery pack widely uses the liquid-cooled type.

The liquid-cooled thermal management system in the related technology usually installs a liquid-cooled plate in the battery pack shell, or directly empties the base material to form a liquid-cooled plate. Once the coolant leaks, it will harm the battery inside the battery pack and lose huge.

Summary of the invention

This application adopts the following technical solutions:

This application aims to solve at least one of the technical problems existing in the prior art.

The power battery pack according to the embodiment of the present application includes a tray and an upper cover. The tray includes a side frame and a bottom plate. The upper cover and the bottom plate are respectively connected to the upper and lower ends of the side frame to define a battery. The accommodating cavity; the single battery, the single battery is installed in the battery accommodating cavity; the bottom guard plate, the bottom guard plate is connected with the lower end of the side frame, and the bottom guard plate is connected to the bottom plate Spaced in the vertical direction; heat exchange plates, the heat exchange plates are sandwiched between the bottom guard plate and the bottom plate.

In the power battery pack of the present application, by arranging the heat exchange plate in the interlayer between the bottom plate and the bottom protection plate, the electrical safety of the power battery pack can be effectively ensured, and the bottom protection plate can protect the heat exchange plate to a certain extent. The heat exchange plate does not occupy the space of the battery accommodating cavity, and the battery density of the entire power battery pack is higher.

The application also proposes a vehicle with the above-mentioned power battery pack.

The vehicle and the aforementioned power battery pack have the same advantages over the prior art, and will not be repeated here.

The additional aspects and advantages of the present application will be partially given in the following description, and some will become obvious from the following description, or be understood through the practice of the present application.

Description of the drawings

The above and/or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

Figure 1 is a top view of a power battery pack according to an embodiment of the present application (the upper cover and the single cells are not shown);

Figure 2 is a cross-sectional view at A-A in Figure 1;

Figure 3 is a partial enlarged view of B in Figure 2;

Figure 4 is an exploded view of a power battery pack according to an embodiment of the present application (the upper cover and the single battery are not shown);

5 is a schematic diagram of the arrangement structure of the single cells in the power battery pack according to an embodiment of the present application;

6 is a schematic structural diagram of the single cells in the power battery pack arranged on the tray according to an embodiment of the present application;

Fig. 7 is a schematic structural diagram of a vehicle according to an embodiment of the present application.

Reference signs:

The vehicle 1000, the power battery pack 100, the tray 110, the side frame 111, the bottom plate 112, the isolation cavity 113, the single battery 120, the heat exchange plate 130, the collecting pipe 131, the joint 132, the bottom guard plate 140, and the end plate 180.

Detailed ways

The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary, and are only used to explain the present application, and cannot be understood as a limitation to the present application.

Unless otherwise specified, the front-rear direction in this application is the longitudinal direction of the vehicle 1000, that is, the X direction; the left-right direction is the lateral direction of the vehicle 1000, that is, the Y direction; and the vertical direction is the vertical direction of the vehicle 1000, that is, the Z direction.

The power battery pack 100 according to an embodiment of the present application will be described below with reference to FIGS. 1 to 4.

In some embodiments, as shown in FIG. 4, the battery pack housing includes a tray 110, an upper cover (not shown in the figure), a single battery 120, a bottom protection plate 140, and a heat exchange plate 130.

As shown in Figure 1, the tray 110 includes a side frame 111 and a bottom plate 112. In actual implementation, the side frame 111 is a four-frame, and the bottom plate 112 is fixedly connected to the bottom surface of the side frame 111. In some embodiments, the bottom plate and the side frame The bottom surface of the package is fixedly connected by welding to serve as the load-bearing structure of the entire package while ensuring the sealing performance of the package. The bottom plate 112 also provides heat equalization performance to facilitate heat exchange between the package body and the outside through the heat exchange plate 130.

The upper cover and the bottom plate 112 are respectively connected with the upper and lower ends of the side frame 111 to define a battery accommodating cavity, and the single battery 120 is installed in the battery accommodating cavity.

In actual implementation, the single battery 120 can be supported on the side frame of the tray 111, and the lower surface of the single battery 120 is spaced apart from the bottom plate of the tray 111, so that the rigidity and strength are far greater than the side frame of the bottom plate. , And a thermally conductive insulating layer may be sandwiched between the single battery 120 and the bottom plate.

The upper cover is connected to the upper end of the side frame 111, and the upper cover and the side frame 111 may be connected by at least one of a threaded connection member and glue. In the actual implementation, glue is sandwiched between the upper end of the side frame 111 and the lower surface of the upper cover to realize the sealing and preliminary connection. The threaded connection is arranged on the outer ring of the glue to fasten the tray 110 and the upper cover. .

As shown in Figures 2 and 3, the bottom guard plate 140 is connected to the lower end of the side frame 111, and the bottom guard plate 140 is spaced apart from the bottom plate 112, so that a cavity is formed between the bottom guard plate 140 and the bottom plate 112, and the heat exchange plate 130 is sandwiched between the bottom shield 140 and the bottom plate 112.

The heat exchange plate 130 has a heat exchange cavity, which is used for the circulation of heat exchange medium, and the heat exchange plate 130 may have a heat exchange cavity for circulation of the heat exchange medium. In actual implementation, the heat exchange plate 130 may be a hollow plate body, and the heat exchange plate 130 is provided with a flow channel for circulating a heat exchange medium, and the heat exchange medium may be water.

It is understandable that the bottom guard plate 140 and the bottom plate 112 are equivalent to a sandwich structure on the bottom surface of the tray 110, so that the heat exchange plate 130 is placed outside of the battery containing cavity, which can effectively ensure the power battery pack 100 in the case of sudden coolant leakage. Electrical safety.

For example, in some embodiments, the power battery pack 100 is installed on the chassis of the vehicle 1000. When the vehicle 1000 is running, if a bump on the road hits the power battery pack 100, the heat exchange plate 130 is damaged. There is also a bottom plate 112 between the battery accommodating cavities for isolation, and the heat exchange medium will not flow into the battery accommodating cavity to affect the single battery 120.

On the other hand, the bottom guard plate 140 can protect the heat exchange plate 130 to a certain extent and prevent the heat exchange plate 130 from being damaged.

As shown in Figure 2, the side frame 111 may be provided with an isolation cavity 113, the end of the heat exchange plate 130 extends into the isolation cavity 113, the heat exchange plate 130 may include a plurality of heat exchange runners, and the heat exchange plate 130 A collecting pipe 131 is arranged at the end, and the collecting pipe 131 is arranged in the isolation cavity 113, and the collecting pipe 131 communicates with an external waterway through a joint 132 that penetrates the side frame 111.

In actual implementation, the side frame 111 can be an aluminum profile, and the aluminum profile has a cavity structure, one of the cavity is open at the lower end, the collecting pipe 131 can be installed in the cavity from the open end below, the bottom guard plate When 140 is connected to the bottom of the side frame 111, the sealing cover cavity forms an isolation cavity 113.

It is understandable that due to the design of the isolation cavity 113 structure, even if leakage occurs at the collecting tube 131, it will not affect the internal circuit, and the collecting tube 131 is equivalent to being installed in the side frame 111 and does not affect the entire power battery Pack 100 battery density.

In the power battery pack 100 of the present application, by arranging the heat exchange plate 130 in the interlayer between the bottom plate 112 and the bottom guard plate 140, the electrical safety of the power battery pack 100 can be effectively ensured, and the bottom guard plate 140 can protect and replace to some extent The heat plate 130, the external heat exchange plate 130 does not occupy the space of the battery accommodating cavity, and the battery density of the entire power battery pack 100 is higher.

In this application, there are multiple single cells 120. The single cells 120 include a battery shell, a battery cell arranged in the battery shell, and electrode terminals electrically connected to the battery core and extending from the battery shell, the single battery 120 and the bottom plate 112 fit.

The bottom plate 112 is made of metal material, and a thermally conductive insulating layer is provided between the single battery and the bottom plate 112.

The heat of the single battery is transferred to the bottom plate through the thermally conductive insulating layer and is dissipated through the bottom plate.

In the power battery pack 100 proposed in this application, a plurality of single cells 120 are arranged side by side.

As shown in Figures 5 and 6, the single battery 120 is a rectangular battery with a rectangular parallelepiped structure, and has a length L, a thickness D, and a height H between the length L and the thickness D. The thickness of the battery is arranged in the D direction. In this way, it is possible to realize high-density arrangement of the single cells not only in the accommodating cavity. And it is more conducive to the heat dissipation of the single battery.

As shown in FIG. 5, the outermost two single batteries 120 along the thickness D direction of the single battery 120 may be equipped with end plates 180, and the single batteries 120 may be connected to the tray 111 through the end plates 180.

The bottom plate 112 of the metal material in the present application is used to protect the internal single cells 120 on the one hand, and on the other hand, the battery accommodating cavity can have a heat dissipation effect. The bottom plate 112 can be made of a metal material with high thermal conductivity. , Including but not limited to aluminum, copper and their alloys.

In actual implementation, the bottom plate 112 may be made of aluminum alloy material, which has good thermal conductivity, low density and low price.

The thermally conductive insulating layer arranged between the single battery and the bottom plate 112 can prevent the single battery 120 from being connected to the tray 110, and can also increase the contact area between the single battery 120 and the tray 110, which is beneficial to the dissipation of heat.

In actual implementation, the thermally conductive insulating layer can be thermally conductive silica gel, which has good insulation and thermal conductivity. The thermally conductive silica gel can conduct the heat of the single battery 120 to the tray 110 and the upper cover in time, and the thermally conductive silica gel is also It has a certain viscosity, and the single battery 120 can be bonded to the tray 110 through thermally conductive silica gel to facilitate the fixing of the single battery.

In some embodiments of the present application, the heat exchange plate 130 and the bottom plate 112 are bonded by thermally conductive structural glue, and the surface of the heat exchange plate 130 and the outer surface of the bottom plate 112 are bonded by thermally conductive structural glue. In this way, the actual effective contact area between the heat exchange plate 130 and the bottom plate 112 is large.

The heat exchange plate 130 has an energy absorbing structure. The heat exchange plate 130 is an integrated structure with flow passages inside. The isolation ribs between adjacent flow passages can form the aforementioned energy absorbing structure, so that the overall structure of the heat exchange plate 130 has both Energy absorption.

In some embodiments, the bottom protection plate 140 includes a main plate body and a heat preservation layer, and the heat preservation layer is provided on a side of the main plate body close to the heat exchange plate 130. The main board body can be a metal plate, including a steel plate, etc. The main board body can play a role in collision avoidance, and the thermal insulation layer can be a structure such as thermal insulation cotton. In this way, the bottom shield 140 has excellent mechanical strength, and at the same time can reduce the heat exchange between the package body and the outside.

In some embodiments, the bottom shield 140 includes a main board body and a buffer layer, and the buffer layer is provided on a side of the main board body close to the heat exchange plate 130. The main board body can be a metal plate, including a steel plate, etc. The main board body can play a role of anti-collision, the buffer layer is used to absorb external impact, and the buffer layer includes a structure such as a rubber layer. In this way, the bottom guard plate 140 has excellent mechanical strength and mechanical impact resistance.

A power battery pack 100 includes a tray 110 and an upper cover. The tray 110 includes a side frame 111 and a bottom plate 112. The upper cover and the bottom plate 112 are respectively connected to the upper and lower ends of the side frame 111 to A battery accommodating cavity is defined; a single battery, the single battery is installed in the battery accommodating cavity; a bottom shield 140, the bottom shield 140 is connected to the lower end of the side frame 111, and the bottom shield The plate 140 is spaced from the bottom plate 112 in the vertical direction; a heat exchange plate 130, the heat exchange plate 130 is sandwiched between the bottom guard plate 140 and the bottom plate 112.

In some embodiments, the single battery is multiple, and the single battery includes a battery case, a battery cell provided in the battery case, and electrode terminals electrically connected to the battery core and extending from the battery case , The single battery is attached to the bottom plate 112.

In some embodiments, a thermally conductive insulating layer is provided between the single battery and the bottom plate 112.

In some embodiments, the heat exchange plate 130 and the bottom plate 112 are bonded by thermally conductive structural glue.

In some embodiments, the heat exchange plate 130 has a heat exchange cavity, and the heat exchange cavity is used for the circulation of heat exchange medium.

In some embodiments, the heat exchange plate 130 has an energy absorbing structure.

In some embodiments, the bottom protection plate 140 includes a main plate body and a heat preservation layer, and the heat preservation layer is provided on a side of the main plate body close to the heat exchange plate 130.

In some embodiments, the bottom protection plate 140 includes a main plate body and a buffer layer, and the buffer layer is provided on a side of the main plate body close to the heat exchange plate 130.

The application also discloses a vehicle 1000.

As shown in FIG. 7, the vehicle 1000 of the embodiment of the present application has the power battery pack 100 of any of the foregoing embodiments.

The vehicle 1000 in the embodiment of the present application may be an electric vehicle 1000, including an electric passenger car or an electric bus.

In some embodiments, the power battery pack 100 may be installed on the chassis of the vehicle 1000.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" etc. means to incorporate the implementation The specific features, structures, materials, or characteristics described by the examples or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above-mentioned terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

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

Claims

A power battery pack (100), characterized in that it comprises:

A tray (110) and an upper cover. The tray (110) includes a side frame (111) and a bottom plate (112). The upper cover and the bottom plate (112) are respectively connected to the upper and lower ends of the side frame (111) Connected to define a battery containing cavity;

Single battery, the single battery is installed in the battery accommodating cavity;

The bottom protection board (140), the bottom protection board (140) is connected to the lower end of the side frame (111), and the bottom protection board (140) and the bottom board (112) are spaced apart in the vertical direction ；

The heat exchange plate (130) is sandwiched between the bottom protection plate (140) and the bottom plate (112).
The power battery pack (100) according to claim 1, characterized in that there are a plurality of single cells, and the single cells include a battery shell, a battery cell arranged in the battery shell, and a battery cell connected to the battery cell. The electrode terminals of the battery shell are electrically connected and extended, and the single battery is attached to the bottom plate (112).
The power battery pack (100) according to claim 1 or 2, characterized in that a thermally conductive insulating layer is provided between the single battery and the bottom plate (112).
The power battery pack (100) according to any one of claims 1-3, wherein the heat exchange plate (130) and the bottom plate (112) are bonded by a thermally conductive structural glue.
The power battery pack (100) according to any one of claims 1-4, wherein the heat exchange plate (130) has a heat exchange cavity, and the heat exchange cavity is used for the circulation of heat exchange medium.
The power battery pack (100) according to any one of claims 1 to 5, wherein the heat exchange plate (130) has an energy absorbing structure.
The power battery pack (100) according to any one of claims 1-6, wherein the bottom protective plate (140) comprises: a main plate body and a heat preservation layer, and the heat preservation layer is provided on the main plate body The side close to the heat exchange plate (130).
The power battery pack (100) according to any one of claims 1-7, wherein the bottom shield (140) comprises: a main board body and a buffer layer, and the buffer layer is provided on the main board body The side close to the heat exchange plate (130).
A vehicle (1000), characterized by having the power battery pack (100) according to any one of claims 1-8.
The vehicle (1000) according to claim 9, wherein the power battery pack (100) is installed on the chassis of the vehicle (1000).