Thermal insulation battery cell, battery cell module and battery pack

Abstract

The utility model provides a heat insulation battery cell, a battery cell module and a battery pack, and relates to the field of battery cell heat control. The heat insulation battery cell comprises a pole group assembly; the heat insulation part is correspondingly arranged on the side part of the pole group assembly so as to insulate heat; and the pole group assembly and the heat insulation part are both positioned in the shell. The side part of the pole group assembly of the battery cell is correspondingly provided with the heat insulation part capable of insulating heat, and then the pole group assembly and the heat insulation part are arranged in the shell, so that the heat conductivity coefficient between the pole group assembly and the shell is reduced. Therefore, in the battery cell module and even the battery pack, the heat insulation part is arranged between any two adjacent battery cells, so that heat spreading in the battery cell module and the battery pack is effectively delayed, and the safety performance of the battery pack during use is effectively improved.

Description

Technical Field

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

[0002] At present, in order to improve the energy density of the battery pack, multiple cells in the battery pack are stacked in sequence, that is, no other components are set between adjacent cells. In this case, if any cell has a thermal runaway such as a short circuit, the heat will be quickly transferred to the adjacent cells of the thermal runaway cell, causing the battery pack to heat up quickly and intensify the chemical reaction inside the battery pack, which will cause the entire battery pack to thermally run away and reduce the safety performance of the battery pack. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide a heat-insulating battery cell, a battery cell module and a battery pack to solve the problem of thermal runaway that is prone to occur due to direct bonding and stacking of existing battery cells.

[0004] According to the above purpose, the first aspect of the present utility model provides a thermal insulation battery core, wherein the thermal insulation battery core comprises:

[0005] Pole assembly;

[0006] A heat insulating portion, correspondingly disposed on the side of the pole group assembly to isolate heat; and

[0007] The shell, the pole group assembly and the heat insulation part are all located inside the shell.

[0008] Preferably, the heat insulation part comprises at least two heat insulation boards.

[0009] Preferably, the two heat insulation plates are respectively located at two ends of the pole group assembly in the thickness direction.

[0010] Preferably, the heat insulation plate is adapted to correspond to the end surface of the pole group assembly.

[0011] Preferably, the thermal insulation board is formed with a first ceramic layer, a PP-based film layer and a second ceramic layer stacked in sequence.

[0012] Preferably, when the heat insulation plate is connected to the pole group assembly correspondingly, the second ceramic layer is fitted to the pole group assembly correspondingly.

[0013] Preferably, the thickness of the PP base film layer is not less than 10 microns.

[0014] Preferably, the thickness of the thermal insulation board is not less than 50 microns.

[0015] According to a second aspect of the utility model, a battery cell module is provided, wherein the battery cell module comprises a plurality of thermal insulation batteries as described above, and the stacking direction of the plurality of thermal insulation batteries is the same as the thickness direction of a single thermal insulation battery cell.

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

[0017] According to the heat-insulating battery cell, battery cell module and battery pack of the utility model, a heat-insulating part capable of isolating heat is correspondingly arranged on the side of the electrode group assembly of the battery cell, and then the electrode group assembly and the heat-insulating part are arranged inside the shell, thereby reducing the thermal conductivity between the electrode group assembly and the shell. In this way, in the battery cell module and even the battery pack, the heat-insulating part is arranged between any two adjacent battery cells, thereby effectively delaying the heat spread inside the battery cell module and the battery pack, thereby effectively improving the safety performance of the battery pack when in use.

[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 specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a schematic diagram of a heat-insulated battery cell according to an embodiment of the utility model;

[0021] Figure 2 is a cross-sectional view of a heat insulation board according to an embodiment of the utility model;

[0022] Figure 3 It is a schematic diagram of a battery cell module according to an embodiment of the utility model.

[0023] Icon: 1- thermal insulation cell; 10- pole group assembly; 11- thermal insulation board; 110- PP base film layer; 111- first ceramic layer; 112- second ceramic layer; 12- shell; 2- cell module. DETAILED DESCRIPTION

[0024] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0025] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0026] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” 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 bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0027] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0028] 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 only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0029] 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 include different orientations of the device in use or operation in addition to the orientation 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 will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations 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.

[0030] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0031] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0032] The features of the examples described herein may 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.

[0033] like Figures 1 to 3 As shown, according to the first aspect of the utility model, a heat-insulated battery cell 1 is provided, which includes a pole group assembly 10, a heat-insulating portion and a shell 12. The heat-insulating portion is correspondingly arranged on the side of the pole group assembly 10 to be able to play a role in isolating heat; in addition, the heat-insulating portion is connected to the pole group assembly 10 and arranged inside the shell 12, so as to reduce the thermal conductivity between the pole group assembly 10 and the shell 12. In the following, the specific structure of the above-mentioned parts of the heat-insulated battery cell 1 according to the utility model will be described in detail.

[0034] Specifically, Figure 1As shown, the heat insulation part in this embodiment includes two heat insulation plates 11, which are respectively located at the two ends of the pole group assembly 10 in the thickness direction. The shape and size of each heat insulation plate 11 are adapted to the end face of the corresponding pole group assembly 10, which is conducive to improving the consistency of the overall structure of the heat insulation battery 1 and can maximize the heat insulation effect under the premise of facilitating the assembly of the heat insulation battery 1. In addition, the heat insulation plate 11 in this embodiment can be connected to the pole group assembly 10 by structural adhesive bonding or tape binding to ensure the stability of the heat insulation plate 11 when connected to the pole group assembly 10.

[0035] It should be noted that the number and shape of the partitions are not limited to this. For example, multiple insulation plates 11 of different shapes can be set on the end face of the pole group assembly 10, but it is necessary to ensure that the whole after the multiple insulation plates 11 of different shapes are combined to correspond to the end face of the pole group assembly 10, that is, the whole after the multiple insulation plates 11 are combined can just cover the corresponding end face of the pole group assembly 10, so as to achieve the above-mentioned technical effect.

[0036] It should be further explained that the above-mentioned heat insulation board 11 is provided at least at both ends of the electrode assembly 10 in the thickness direction, that is, the heat insulation board 11 can also be provided at both ends of the electrode assembly 10 in the width direction, so that the four sides of the electrode assembly 10 are provided with the heat insulation board 11, thereby further improving the heat insulation effect of a single battery cell. In addition, when multiple heat-insulating battery cells 1 are stacked in sequence to form a battery cell module 2, the stacking direction of the multiple battery cells is the same as the thickness direction of a single battery cell, which can effectively delay the heat spread inside the battery cell module 2 and the battery pack, thereby effectively improving the safety of the battery cell.

[0037] Specifically, Figure 2 As shown, the heat insulation board 11 in this embodiment is formed with a first ceramic layer 111, a PP base film layer 110 and a second ceramic layer 112 stacked in sequence. When the heat insulation board 11 is connected to the electrode assembly 10, the second ceramic layer 112 is correspondingly bonded to the electrode assembly 10. The formation method of the heat insulation board 11 is not fixed. For example, ceramic materials such as zirconium oxide can be sprayed on both ends of the PP base film layer 110 in the thickness direction through a ceramic spraying process to form the first ceramic layer 111 and the second ceramic layer 112. It should be noted that the base film layer of the heat insulation board 11 can also be made of electrolyte-resistant materials such as PI, PET, and PE. Preferably, the thickness of the PP base film layer 110 in this embodiment is not less than 10 microns, and the thickness of the heat insulation board 11 is not less than 50 microns. This value is the numerical range that can maximize the heat insulation effect of the heat insulation board 11 after multiple tests.

[0038] According to the heat-insulating battery cell 1 of the utility model, a heat-insulating part capable of isolating heat is correspondingly arranged on the side of the electrode assembly 10 of the battery cell, and then the electrode assembly 10 and the heat-insulating part are arranged inside the shell 12, thereby reducing the thermal conductivity between the electrode assembly 10 and the shell 12. In this way, in the battery cell module 2 and even the battery pack, the heat-insulating part is arranged between any two adjacent battery cells, thereby effectively delaying the heat spread inside the battery cell module 2 and the battery pack, thereby effectively improving the safety performance of the battery pack when in use.

[0039] According to a second aspect of the utility model, a battery cell module 2 is provided, wherein the battery cell module 2 comprises the thermal insulation battery cell 1 as described above, and the stacking direction of the plurality of thermal insulation battery cells 1 is the same as the thickness direction of a single thermal insulation battery cell 1 .

[0040] According to a third aspect of the present invention, a battery pack is provided, wherein the battery pack is provided with the battery cell module 2 as described above.

[0041] 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 protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A thermal insulation battery cell, characterized in that: The thermal insulation core comprises: Pole group assembly; A heat insulating portion, correspondingly disposed on the side of the pole group assembly to isolate heat; and The shell, the pole group assembly and the heat insulation part are all located inside the shell.

2. The thermal insulation core according to claim 1, characterized in that: The heat insulation part includes at least two heat insulation boards.

3. The heat-insulated battery cell according to claim 2, characterized in that: The two heat insulation plates are respectively located at two ends of the pole group assembly in the thickness direction.

4. The heat-insulated battery cell according to claim 3, characterized in that: The heat insulation plate is adapted to correspond to the end surface of the pole group assembly.

5. The heat-insulated battery cell according to claim 2, characterized in that: The heat insulation board is formed with a first ceramic layer, a PP-based film layer, and a second ceramic layer stacked in sequence.

6. The heat-insulated battery cell according to claim 5, characterized in that: When the heat insulation plate is connected to the pole group assembly correspondingly, the second ceramic layer is fitted to the pole group assembly correspondingly.

7. The heat-insulated battery cell according to claim 5, characterized in that: The thickness of the PP base film layer is not less than 10 microns.

8. The heat-insulated battery cell according to claim 5, characterized in that: The thickness of the heat insulation board is not less than 50 microns.

9. A battery cell module, characterized in that: The battery cell module comprises a plurality of thermal insulation batteries as claimed in any one of claims 1 to 8, and a stacking direction of the plurality of thermal insulation batteries is the same as a thickness direction of a single thermal insulation battery cell.

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

Images