Single battery, battery module and battery pack

Abstract

The utility model provides a single battery, a battery module and a battery pack, and relates to the field of battery cell thermal control. The single battery comprises a naked battery cell; the outer side wall of the naked battery cell is coated with the heat insulation part; and a shell, wherein the naked battery cell is located in the shell. According to the battery pack, the outer side wall of the naked battery cell of the single battery is coated with the heat insulation part, and the naked battery cell provided with the heat insulation part is arranged in the shell, so that heat spreading among the single battery cells can be effectively delayed, and further, the heat spreading of the whole battery pack is effectively delayed.

Description

Technical Field

[0001] The present application relates to the field of battery cell thermal control, and in particular to a single cell, a battery module and a battery pack. Background Art

[0002] Currently, to increase the energy density of battery packs, the aerogel insulation between individual cells is removed during battery layout optimization, with the individual cells arranged directly next to each other. In this case, if one cell experiences thermal runaway, heat will quickly transfer to adjacent cells, accelerating the spread of heat throughout the battery pack and reducing the escape time for vehicle occupants. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide a single cell, a battery module and a battery pack to solve the problem of excessively fast heat spread in the entire battery pack due to the direct bonding arrangement of the single cells in the existing battery pack.

[0004] In accordance with the above objectives, a first aspect of the present invention provides a single cell battery, wherein the single cell battery comprises:

[0005] Bare battery cells;

[0006] a heat insulating member, the heat insulating member being coated on the outer side wall of the bare battery core; and

[0007] The bare battery cell is located inside the shell.

[0008] Preferably, the thermal insulation member is formed as an insulating tape so that the thermal insulation member is bonded to the bare battery cell.

[0009] Preferably, the thermal insulation member is formed with an insulating portion and an adhesive portion.

[0010] Preferably, the bonding portion comprises acrylic glue and solid particles, and the solid particles occupy no more than 40% of the volume of the bonding portion; the solid particles form a cavity, and the cavity is filled with air and carbon dioxide.

[0011] Preferably, the solid particles are formed into a spherical structure and the diameter of the solid particles is formed to be D, 5 micrometers ≤ D ≤ 15 micrometers.

[0012] Preferably, the insulating portion includes at least a first insulating layer and a second insulating layer.

[0013] Preferably, the adhesive portion includes at least a first adhesive layer and a second adhesive layer.

[0014] Preferably, the first insulating layer, the first adhesive layer, the second insulating layer and the second adhesive layer are stacked in sequence.

[0015] According to a second aspect of the present invention, a battery module is provided, wherein the battery module includes a plurality of single batteries as described above.

[0016] According to a third aspect of the present invention, a battery pack is provided, wherein the battery pack is provided with the battery module described above.

[0017] According to the single battery, battery module and battery pack of the present invention, a heat insulating member is wrapped around the outer wall of the bare cell of the single battery, and the bare cell provided with the heat insulating member is placed inside the outer shell. This can effectively delay the heat spread between the single cells, and further effectively delay the heat spread of the entire battery pack.

[0018] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 is a schematic diagram of a single battery according to an embodiment of the present utility model;

[0021] Figure 2 It is a cross-sectional view of a thermal insulation component according to an embodiment of the present utility model.

[0022] Icon: 1-bare cell; 2-thermal insulation; 20-first insulating layer; 21-second insulating layer; 22-first adhesive layer; 23-second adhesive layer; 24-solid particles. DETAILED DESCRIPTION

[0023] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0024] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0025] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on,” “directly connected to,” “directly coupled to,” “directly over,” or “directly covering” another element, there may be no other elements intervening therebetween.

[0026] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0027] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, a first member, component, region, layer, or portion in the examples described herein may also be referred to as a second member, component, region, layer, or portion without departing from the teachings of the examples.

[0028] For ease of description, spatial relational terms such as "above," "upper," "below," and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element would subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations "above" and "below," depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0029] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0030] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.

[0031] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0032] like Figures 1 to 2 As shown, according to a first aspect of the present invention, a single cell is provided. The single cell includes a bare cell 1, a thermal insulator 2, and a housing. The thermal insulator 2 is wrapped around the outer wall of the bare cell 1, and the two are stably connected and placed inside the housing. The specific structure of each of the above-mentioned components of the single cell according to the present invention will be described in detail below.

[0033] In this embodiment, the thermal insulation member 2 is formed as an insulating tape, that is, the thermal insulation member 2 is stably connected to the bare battery cell 1 by bonding. Figure 1 As shown, the top of the bare cell 1 is provided with an explosion-proof valve, and the thermal insulation 2 is wrapped around the outer walls of its four sides. It should be noted that the thermal insulation 2 can completely cover the sides of the bare cell 1, or only partially cover the sides of the bare cell 1 (i.e., the thermal insulation 2 is partially provided on all four sides of the bare cell 1), as long as the technical effect of thermal insulation can be achieved to delay the spread of heat between the single cells.

[0034] More specifically, the thermal insulation member 2 in this embodiment is formed with an insulating portion and an adhesive portion, so that while achieving the thermal insulation effect of the thermal insulation member 2, it can also ensure the insulation effect of the single battery cell, thereby improving the safety of the single battery cell during use. In this embodiment, the insulating portion is made of PET material to ensure the insulation effect of the thermal insulation member 2. In addition, in this embodiment, the adhesive portion includes acrylic glue and solid particles 24, that is, the adhesive portion is a mixture of acrylic glue and solid particles 24, and preferably, the solid particles 24 occupy no more than 40% of the volume of the adhesive portion, so that while ensuring that the thermal insulation member 2 has sufficient viscosity, it can also ensure the thermal insulation effect of the thermal insulation member 2. Furthermore, the solid particles 24 in this embodiment form a cavity, and the cavity is filled with air and carbon dioxide, so that the thermal insulation function of the thermal insulation member 2 on the bare battery cell 1 can be achieved.

[0035] It should be noted that there are no specific limitations on the shape and size of the solid particles 24, or the shape and size of the cavities they form. For example, in this embodiment, the solid particles 24 are spherical, and their diameter D is set to 5 μm ≤ D ≤ 15 μm. If the diameter is too large, it will affect the folding and wrapping of the thermal insulation element 2, while if the diameter is too small, the thermal insulation effect of the thermal insulation element 2 cannot be achieved. In addition, the solid particles 24 in this embodiment are made of glass to ensure the insulation effect of the thermal insulation element 2.

[0036] Furthermore, if Figure 2 As shown, the bonding portion in this embodiment includes a first bonding layer 22 and a second bonding layer 23, and the insulating portion includes a first insulating layer 20 and a second insulating layer 21. The first insulating layer 20, the first bonding layer 22, the second insulating layer 21 and the second bonding layer 23 are stacked in sequence to form a thermal insulation part 2.

[0037] According to the single battery of the present invention, the outer wall of the bare cell 1 of the single battery is covered with a heat insulating member 2, and the bare cell 1 provided with the heat insulating member 2 is placed inside the shell, which can effectively delay the heat spread between the single cells, and further effectively delay the heat spread of the entire battery pack.

[0038] According to a second aspect of the present invention, a battery module is provided, wherein the battery module includes the single battery as described above.

[0039] According to a third aspect of the present invention, a battery pack is provided, wherein the battery pack is provided with the battery module described above.

[0040] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. These modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims.

Claims

1. A single cell battery, characterized in that: The single cell battery comprises: Bare battery cells; A heat insulating member, the heat insulating member covering the outer side wall of the bare battery core; and The bare battery cell is located inside the shell.

2. The single cell according to claim 1, characterized in that: The thermal insulation member is formed as an insulating tape so that the thermal insulation member is bonded to the bare battery cell.

3. The single cell according to claim 2, characterized in that: The heat insulating member is formed with an insulating portion and a bonding portion.

4. The single cell according to claim 3, characterized in that: The bonding part includes acrylic glue and solid particles, and the solid particles occupy no more than 40% of the volume of the bonding part; the solid particles form a cavity, and the cavity is filled with air and carbon dioxide.

5. The single cell according to claim 4, characterized in that: The solid particles are formed into a spherical structure and the diameter of the solid particles is formed to be D, 5 micrometers ≤ D ≤ 15 micrometers.

6. The single cell according to claim 4, characterized in that: The insulating portion includes at least a first insulating layer and a second insulating layer.

7. The single cell according to claim 6, characterized in that: The adhesive portion includes at least a first adhesive layer and a second adhesive layer.

8. The single cell according to claim 7, characterized in that: The first insulating layer, the first adhesive layer, the second insulating layer, and the second adhesive layer are stacked in sequence.

9. A battery module, characterized in that: The battery module comprises a plurality of single batteries according to any one of claims 1 to 8.

10. A battery pack, characterized in that: The battery pack is provided with the battery module as claimed in claim 9.

Images