Bare cell insulation structure and cell structure

Abstract

The utility model provides a naked battery cell insulation structure and a battery cell structure, and belongs to the field of new energy batteries. The insulation structure comprises an insulation film, the insulation film is of a sheet structure, the insulation film comprises a first insulation layer, a second insulation layer and a heat conduction layer, and the heat conduction layer is clamped between the first insulation layer and the second insulation layer. By adopting the naked battery cell insulation structure and the battery cell structure provided by the embodiment of the utility model, the problem of poorer heat-conducting property in the prior art can be solved.

Description

Technical Field

[0001] This utility model relates to the field of new energy batteries, and in particular to a bare cell insulation structure and cell structure. Background Technology

[0002] Currently, to ensure the safety of lithium-ion batteries, an insulating structure is needed to isolate the bare cells from the metal casing inside the battery. However, with the increasing demand for longer battery life and reduced charging anxiety, battery cells with high energy density and fast charging capabilities have received widespread attention. As the capacity of lithium-ion batteries increases, the charging rate also increases, meaning the current becomes larger, and so does the internal heat generation. How to ensure safety while accelerating heat dissipation within the lithium-ion battery is a key technical problem that urgently needs to be solved.

[0003] In existing technologies, a single-layer insulating film is typically used to wrap the bare battery cell before it is installed and fitted with a metal casing. While the single-layer insulating film can ensure the insulation between the bare battery cell and the metal casing, it is difficult to achieve the purpose of heat dissipation.

[0004] The insulation structure in the prior art uses only a single layer of insulation film, which results in poor heat dissipation when the thickness is relatively large. Utility Model Content

[0005] This utility model provides a bare battery cell insulation structure and a battery cell structure, which can solve the problem of poor heat dissipation in the prior art. The technical solution is as follows:

[0006] Firstly, a bare battery cell insulation structure includes: an insulating film,

[0007] The insulating film has a sheet-like structure and includes a first insulating layer, a second insulating layer, and a thermally conductive layer, with the thermally conductive layer sandwiched between the first insulating layer and the second insulating layer.

[0008] Optionally, the insulating film further includes a third insulating layer located at the edge of the insulating film. The third insulating layer is used to connect the first insulating layer and the second insulating layer and to wrap the thermally conductive layer inside the insulating film.

[0009] Optionally, multiple insulating films are provided, and the multiple insulating films are enclosed to form an upward-opening box-shaped structure.

[0010] Optionally, the box-shaped structure is provided with a vertical insulating film inside, which divides the box-shaped structure into a first cavity and a second cavity.

[0011] Optionally, the thickness of the insulating film is ≤0.4mm.

[0012] Optionally, the thickness of the second insulating layer is greater than the thickness of the first insulating layer.

[0013] Optionally, the first insulating layer and the second insulating layer are glass fiber components.

[0014] Secondly, a battery cell structure includes the aforementioned bare battery cell insulation structure, and further includes two battery cells, which are respectively disposed in the first cavity and the second cavity.

[0015] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following:

[0016] This utility model provides a bare battery cell insulation structure and a battery cell structure. The insulating film is configured as a three-layer superimposed structure consisting of a first insulating layer, a second insulating layer, and a thermally conductive layer. The thermally conductive layer is sandwiched between the first and second insulating layers. When the insulating film surrounds the bare battery cell, the heat generated by the bare battery cell can be transferred from the first insulating layer to the thermally conductive layer, then accelerated to the second insulating layer, and finally transferred to the external space. By setting the first and second insulating layers, the insulation performance between the battery cell and the external environment is ensured. The thermally conductive layer accelerates the heat transfer speed, effectively solving the problem of poor heat dissipation in existing technologies. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the insulating film structure provided in an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of a box-shaped structure made of insulating film provided in an embodiment of this utility model;

[0020] Figure 3 This is a schematic cross-sectional view of the battery cell structure provided in an embodiment of this utility model.

[0021] In the figure: 1-insulating film; 101-first cavity; 102-second cavity; 11-first insulating layer; 12-second insulating layer; 13-thermal conductive layer; 14-third insulating layer; 2-battery cell. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the insulating film structure provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of a box-shaped structure made of insulating film provided in an embodiment of this utility model; Figure 3 This is a schematic cross-sectional view of the battery cell structure provided in an embodiment of this utility model. Figures 1 to 3 The bare battery cell insulation structure shown includes: an insulating film 1, which is a sheet structure, and includes a first insulating layer 11, a second insulating layer 12 and a thermally conductive layer 13, with the thermally conductive layer 13 sandwiched between the first insulating layer 11 and the second insulating layer 12.

[0024] For example, in this embodiment of the present invention, the insulating film 1 is wrapped around the outside of the bare battery cell, and the first insulating layer 11 is in contact with the bare battery cell. The heat generated by the bare battery cell is transferred through the first insulating layer 11, through the thermally conductive layer 13, to the second insulating layer 12, and then to the outside. By using a structure in which the thermally conductive layer 13 is sandwiched between the first insulating layer 11 and the second insulating layer 12, the thermal conductivity of the thermally conductive layer 13 is greater than that of the first insulating layer 11 and the second insulating layer 12. This accelerates the heat transfer from the first insulating layer 11 to the thermally conductive layer 13, allowing the heat to be quickly transferred to the second insulating layer 12 and then discharged to the external environment, thereby improving the overall heat transfer efficiency of the structure. Compared to traditional technologies that use only a single insulating layer to insulate the bare battery cell and metal casing, where the heat generated by the bare battery cell is difficult to dissipate when the insulating layer is thick, resulting in poor heat dissipation performance and even causing excessive temperature and fire, this utility model embodiment provides a heat-conducting layer 13 between the first insulating layer 11 and the second insulating layer 12, which accelerates the transfer of heat between the insulating films 1, thereby solving the problem of poor heat dissipation in the prior art.

[0025] This utility model provides a bare battery cell insulation structure and a battery cell structure. The insulating film 1 is configured as a three-layer stacked structure consisting of a first insulating layer 11, a second insulating layer 12, and a thermally conductive layer 13. The thermally conductive layer 13 is sandwiched between the first insulating layer 11 and the second insulating layer 12. When the insulating film 1 is wrapped around the bare battery cell, the heat generated by the bare battery cell can be transferred from the first insulating layer 11 to the thermally conductive layer 13, then accelerated to the second insulating layer 12, and finally to the external space. By setting the first insulating layer 111 and the second insulating layer 12, the insulation performance between the battery cell and the external environment is ensured. By setting the thermally conductive layer 13, the speed of heat transfer is accelerated, effectively solving the problem of poor heat dissipation in the prior art.

[0026] Optionally, the insulating film 1 further includes a third insulating layer 14, which is located at the edge of the insulating film 1. The third insulating layer 14 is used to connect the first insulating layer 11 and the second insulating layer 12, and to wrap the heat-conducting layer 13 inside the insulating film 1.

[0027] For example, in this embodiment of the present invention, when the heat-conducting layer 13 is made of solid material, only the first insulating layer 11 and the second insulating layer 12 are provided to clamp the heat-conducting layer 13. When the heat-conducting layer 13 is made of liquid or particulate material, by providing the third insulating layer 14, the heat-conducting layer 13 can be wrapped inside the insulating film 1. Some liquid or particulate heat-conducting materials have better thermal conductivity than solid materials. Therefore, by adding the third insulating layer 14, the versatility of this insulating structure is improved.

[0028] Optionally, multiple insulating films 1 are provided, and the multiple insulating films 1 are enclosed to form an upward-opening box-shaped structure.

[0029] For example, in this embodiment of the present invention, the insulating film 1 is made into a box-shaped structure, which facilitates the subsequent placement of the battery cell 2 inside the box-shaped structure. The battery cell 2 and the box-shaped structure are then placed together in a metal casing to assemble a lithium battery cell structure. The lithium battery cell structure formed by this structure can take into account both insulation performance and thermal conductivity performance, thereby improving the practicality of this insulating structure.

[0030] Optionally, a vertical insulating film 1 is provided inside the box-shaped structure, which divides the box-shaped structure into a first cavity 101 and a second cavity 102.

[0031] For example, in this embodiment of the present invention, an insulating film 1 is added inside the box-shaped structure, which can divide the internal space of the box-shaped structure into a first cavity 101 and a second cavity 102. When the lithium battery cell structure is a dual-cell structure, this insulating structure can be used in conjunction with the cell 2. The two cells 2 can be placed in the first cavity 101 and the second cavity 102 respectively, so that the heat generated by the two cells 2 can be conducted to the outside through the heat-conducting layer 13, thereby further improving the heat dissipation of the insulating structure.

[0032] Optionally, the thickness of the insulating film 1 is ≤0.4mm.

[0033] For example, in this embodiment of the present invention, in order to improve the energy density of the lithium battery cell structure, it is necessary to minimize the thickness of the insulating film 1, so as to provide more space for storing the cell 2. Limiting the thickness of the insulating film 1 to less than or equal to 0.4 mm can both meet the insulation requirements between the cell 2 and the metal casing and reduce the space occupied by the insulating film 1, thereby improving the energy density of the lithium battery cell structure.

[0034] Optionally, the thickness of the second insulating layer 12 is greater than the thickness of the first insulating layer 11.

[0035] For example, in this embodiment of the invention, the thickness of the first insulating layer 11 is less than or equal to 0.1 mm, and the thickness of the second insulating layer 12 is greater than or equal to 0.1 mm and less than or equal to 0.3 mm; this thickness range is optimal. The first insulating layer 11 is disposed close to the battery cell 2, and the thickness of the second insulating layer 12 is greater than the thickness of the first insulating layer 11. This allows the heat generated within the battery cell 2 to quickly pass through the first insulating layer 11 to the heat-conducting layer, thereby enabling the heat generated within the battery cell 2 to dissipate more quickly, further improving the heat dissipation performance of this insulating structure.

[0036] Optionally, the first insulating layer 11 and the second insulating layer 12 are made of glass fiber.

[0037] For example, in this embodiment of the present invention, the first insulating layer 11 and the second insulating layer 12 can be made of one or two of the following materials: polyester fiber, polypropylene, polyimide, aramid fiber, and glass fiber. These materials all have the advantages of good insulation and thermal conductivity. The first insulating layer 11 and the second insulating layer 12 made of these materials can not only achieve the purpose of insulation, but also achieve the purpose of rapid heat conduction. The thermally conductive layer 13 can be a thermally conductive liquid filler such as silicone oil, ethanol, water, ethylene glycol, pentaerythritol, or neopentyl glycol, or a thermally conductive solid filler such as graphite, ceramics, semiconductors, or alloys, or a solid-liquid mixture filler. These materials also have good thermal conductivity, which allows heat to be transferred quickly in the thermally conductive layer 13, thereby further improving the heat dissipation of this insulating structure.

[0038] A battery cell structure includes the aforementioned bare battery cell insulation structure, and further includes two battery cells 2, which are respectively disposed in a first cavity 101 and a second cavity 102.

[0039] For example, in this embodiment of the present invention, compared with using a single cell structure, by setting the lithium battery cell structure into two separate cells 2, the heat dissipation area of ​​the lithium battery cell structure is increased. By also setting an insulating film 1 between the two cells 2, the heat dissipation speed between the two cells 2 can be improved, thereby enabling the internal heat of the lithium battery cell structure to be transferred to the outside more quickly, thus improving the heat dissipation performance of the cell structure.

[0040] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0041] The above description is only an optional embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bare cell insulation structure, characterized in that, include: Insulating film (1), The insulating film (1) has a sheet-like structure and includes a first insulating layer (11), a second insulating layer (12) and a thermally conductive layer (13), with the thermally conductive layer (13) sandwiched between the first insulating layer (11) and the second insulating layer (12).

2. The bare cell insulation structure according to claim 1, characterized in that, The insulating film (1) further includes a third insulating layer (14), which is located at the edge of the insulating film (1). The third insulating layer (14) is used to connect the first insulating layer (11) and the second insulating layer (12) and to wrap the heat-conducting layer (13) inside the insulating film (1).

3. The bare cell insulation structure according to claim 2, characterized in that, Multiple insulating films (1) are provided, and the multiple insulating films (1) are enclosed to form an upward-opening box-shaped structure.

4. The bare cell insulation structure according to claim 3, characterized in that, The box-shaped structure has a vertical insulating film (1) inside, which divides the box-shaped structure into a first cavity (101) and a second cavity (102).

5. The bare cell insulation structure according to claim 4, characterized in that, The thickness of the insulating film (1) is ≤0.4mm.

6. The bare cell insulation structure according to claim 5, characterized in that, The thickness of the second insulating layer (12) is greater than the thickness of the first insulating layer (11).

7. The bare cell insulation structure according to claim 4, characterized in that, The first insulating layer (11) and the second insulating layer (12) are made of glass fiber.

8. A battery cell structure, comprising the bare battery cell insulation structure as described in claim 7, characterized in that, It also includes two battery cells (2), which are respectively disposed in the first cavity (101) and the second cavity (102).

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