Protective part, power battery and vehicle

Abstract

The utility model relates to a protection part, a power battery and a vehicle. The utility model relates to a protection part for a power battery, which is characterized in that the protection part comprises a plurality of protection units, the plurality of protection units are arranged on different battery modules in the power battery at intervals, the protection part is provided with open holes, and the positions of the open holes correspond to explosion-proof valves of the battery modules.

Description

Technical Field

[0001] The present application relates to the field of safety protection of vehicle batteries, and more particularly to the field of insulation protection of batteries. Background Art

[0002] With the continuous increase in the demand for the cruising range of electric vehicles, the energy density of the power batteries of electric vehicles is getting higher and higher. At the same time, the problem of thermal runaway of power batteries has also received increasing attention. Therefore, curbing the arcing phenomenon accompanied by thermal runaway and ensuring the reliability of power batteries are issues of concern in this field.

[0003] The information provided in this part is for the purpose of generally presenting the background of the present application, and thus may include information that does not constitute the prior art in this field. Summary of the Utility Model

[0004] The purpose of the present application is to solve or at least alleviate the problems existing in the prior art.

[0005] One aspect of the present application relates to a protective member for a power battery, which is characterized in that it includes a plurality of protection units, the plurality of protection units are arranged at intervals on different battery modules in the power battery, and the protective member is provided with an opening, and the position of the opening corresponds to the explosion-proof valve of the battery module.

[0006] In an embodiment of the present application, optionally, the protection units of the protective member are arranged such that the minimum electrical clearance in the part of the power battery not covered by the protection units is greater than a first set value, and / or, the creepage distance is greater than a second set value.

[0007] In an embodiment of the present application, optionally, the protection unit is a flexible member.

[0008] In an embodiment of the present application, optionally, one or more of the protection units adhere to the battery module, and / or, one or more of the protection units are fixed to the battery module via fasteners.

[0009] In an embodiment of the present application, optionally, the protection unit includes one or more impact-resistant layers and one or more heat-insulating layers, and the impact-resistant layer and the heat-insulating layer are configured to be alternately arranged.

[0010] In an embodiment of the present application, optionally, the impact-resistant layer is made of fiberglass or basalt cloth, and the heat-insulating layer is a ceramic material layer.

[0011] In an embodiment of the present application, optionally, both the impact-resistant layer and / or the heat-insulating layer are high-temperature-resistant materials that can withstand temperatures above 1000°C.

[0012] In an embodiment of the present application, optionally, the protection unit is formed by bending a flexible member.

[0013] Another aspect of the present application relates to a power battery, which includes the protection member according to any one of the foregoing contents.

[0014] The present application also relates to a vehicle, which includes the power battery according to the foregoing contents. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Referring to the accompanying drawings, the disclosure of the present application will become more understandable. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the protection scope of the present application. In addition, similar numbers in the drawings are used to represent similar components, where:

[0016] Figure 1 Illustrates the structure of the protection member according to an embodiment of the present application;

[0017] Figures 2a - 2f Respectively illustrate the front view, left view, right view, top view, bottom view and perspective view of the protection unit according to an embodiment of the present application;

[0018] Figures 3a - 3c Respectively illustrate the top view, side view and perspective view of the relative relationship between the protection unit and the battery module according to an embodiment of the present application;

[0019] Figures 4a - 4c Respectively illustrate the cross-sectional views of different embodiments of the protection unit according to the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] First of all, it should be noted that the following will illustrate the composition, characteristics and advantages of the protection member, power battery and vehicle according to the present application by way of examples. However, it should be understood that all descriptions are only given for illustrative purposes and should not be construed as forming any limitation to the present application. In this article, the technical terms "first" and "second" are only used for the purpose of distinguishing expressions and are not intended to indicate their order and relative importance. The technical term "connection (or connection, etc.)" covers that a specific component is directly connected to another component and / or indirectly connected to another component. In addition, unless otherwise clearly specified and limited, the dimensional, directional or positional relationships indicated by the technical terms "length", "width", "height", "upper", "top", "bottom", etc. are based on the dimensions, orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and should not be construed as a limitation to the present application.

[0021] In addition, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the drawings, this application still allows any combination or deletion between these technical features (or their equivalents) without any technical obstacles, thereby obtaining more other embodiments of this application that may not be directly mentioned herein. Additionally, general matters that are already well-known to those skilled in the art will not be elaborated herein.

[0022] To provide thermal protection and insulation protection for the battery cells or modules in a power battery, avoid the spread and expansion of thermal runaway, and prevent the occurrence of arcing, this application proposes a protective component for a power battery. In one embodiment of this application, the protective component includes a protection unit 10. As shown in Figure 1 , the shaded part schematically shows the protection unit 10, and the protective component includes multiple protection units 10. There are multiple battery modules in the power battery 200. The protection unit 10 can cover the upper surface of the battery module to provide heat insulation and insulation protection for the battery module, and can protect the surface of the battery module from being scratched and impacted by ejected substances. Preferably, in the embodiments of this application, the protection unit 10 does not necessarily need to be applied to each battery module, but can be arranged at intervals. Figure 1 The interval arrangement shown in

[0023] Figures 2a - 2f is that in each row and each column, every other battery module in the battery modules is covered with the protection unit 10, which is only schematic. In actual applications, those skilled in the art can set the interval mode of the protection unit 10 according to the actual application requirements of the power battery. For example, the interval can be regular or irregular, or the interval mode can be divided by regions, or the density of the protection unit 10 can be set according to the level of arcing risk. The protection unit 10 can also be in an irregular shape and be formed according to the shape of the protected position. Specifically, when the minimum electrical clearance in the part of the power battery not covered by the protection unit is greater than the first set value, and / or when the creepage distance in the part of the power battery not covered by the protection unit is greater than the second set value, the requirement for suppressing arcing can be met. The first set value is the national standard value of the electrical clearance or the value set by the designer, and the second set value is the national standard value of the creepage distance or the value set by the designer. Figure 2a and Figure 2f , it can be seen that the protection unit 10 is provided with an opening, which is used to expose the explosion-proof valve on the battery cell or battery module. When the battery cell undergoes thermal runaway, high-temperature gases and substances are ejected from the explosion-proof valve. Setting the opening can avoid blocking the explosion-proof valve, and other parts of the protection unit are attached to the battery cell module to protect the module.Figures 3a - 3c The schematic diagram of the relative relationship between the battery module 20 and the protection unit 10 is shown, where the protection unit 10 is not yet attached to the battery module 20. It can be seen that the opening 13 on the protection unit 10 enables the explosion-proof valve 21 to be exposed, and has a bent part for better covering and mounting on the battery module 20. The protection unit 10 can be attached to the battery module by adhesion, or can be fixedly connected to the battery module by fixing means such as bolts and screws.

[0024] Figures 4a - 4c Different embodiments of the protection unit 10 are shown. The protection unit 10 can be composed of an impact-resistant layer 11 and a heat-insulating layer 12, which may include one or more layers of the impact-resistant layer 11 and one or more layers of the heat-insulating layer 12. In Figure 4a In this case, the protection unit 10 includes two layers, including the impact-resistant layer 11 located on the upper layer and the heat-insulating layer 12 located on the lower layer. In Figure 4b In this case, the protection unit 10 includes three layers, including the impact-resistant layer 11 located on the uppermost layer and the lowermost layer, and the heat-insulating layer 12 located in the middle layer. In Figure 4c In this case, the protection unit 10 includes three layers, namely the heat-insulating layer 12 located on the uppermost layer and the lowermost layer, and the impact-resistant layer 11 located in the middle layer. It can be seen that the impact-resistant layer 11 and the heat-insulating layer 12 in the protection unit 10 are arranged alternately. Both the impact-resistant layer 11 and the heat-insulating layer 12 are high-temperature resistant materials, which generally need to be able to withstand high temperatures above 1000 °C. The impact-resistant layer 11 can play a certain buffering and anti-scratching effect, and resist the damage of the substances ejected by the explosion-proof valve to the battery module. Specifically, the impact-resistant layer 11 is made of a mesh material, such as fiberglass or basalt cloth, which has a certain buffering ability. The heat-insulating layer 12 can block the high-density heat transfer, and at the same time, the strength of this layer is enhanced after encountering high temperatures, and it can prevent being burned through, such as a ceramic material layer. Through the combination of the impact-resistant layer 11 and the heat-insulating layer 12, the insulation and protection effects under high-temperature conditions can be achieved, and the occurrence of arcing can be prevented. Those skilled in the art can further combine the impact-resistant layer 11 and the heat-insulating layer 12 according to needs to meet the requirements.

[0025] By setting the protection part in the technical solution of the present application, the safety of the vehicle power battery can be improved, the personal safety of the occupants can be guaranteed, and the cost can be effectively reduced at the same time.

[0026] The specific embodiments described above in the present application are only for more clearly describing the principle of the present application, in which each component is clearly shown or described to make the principle of the present application easier to understand. Without departing from the scope of the present application, those skilled in the art can easily make various modifications or changes to the present application. Therefore, it should be understood that these modifications or changes should be included within the scope of the patent protection of the present application.

Claims

1. A protective member, the protective member being for a power battery, characterized in that It includes a plurality of protection units, and the plurality of protection units are arranged at different battery modules in the power battery at intervals. Openings are provided on the protection member, and the positions of the openings correspond to the explosion-proof valves of the battery modules.

2. The protective member according to claim 1, characterized in that, The protection units of the protection member are arranged such that the minimum electrical clearance in the part of the power battery not covered by the protection units is greater than a first set value, and / or the creepage distance is greater than a second set value.

3. The protective member according to claim 1, wherein, The protection unit is a flexible member.

4. The protective member according to claim 1, wherein One or more of the protection units adhere to the battery module, and / or one or more of the protection units are fixed to the battery module via fasteners.

5. The protective member according to claim 1, wherein The protection unit includes one or more impact-resistant layers and one or more heat-insulating layers, and the impact-resistant layer and the heat-insulating layer are configured to be alternately arranged.

6. The protective member according to claim 5, wherein, The impact-resistant layer is made of fiberglass or basalt cloth, and the heat-insulating layer is a ceramic material layer.

7. The protective member according to claim 5, wherein Both the impact-resistant layer and / or the heat-insulating layer are high-temperature resistant materials that can withstand temperatures above 1000 °C.

8. The protective member according to claim 3, characterized in that, The protection unit is formed by bending a flexible member.

9. A power battery, characterized in that, The power battery includes the protection member according to any one of claims 1-8.

10. A vehicle, characterized in that, The vehicle includes the power battery according to claim 9.

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