Insulating film, battery cell, battery pack, and vehicle

Abstract

The application provides an insulating film, an electric core, a battery pack and a vehicle. The insulating film comprises a film body and a first window and a second window arranged on the film body. The first window and the second window are arranged at intervals and are arranged along the width direction of the film body respectively. The first window and the second window are used for allowing an adhesive to pass through the film body and to be directly connected to the electric core. In the application, the arrangement of the insulating film can better expose the mounting surface in a limited area, so that the adhesion of the electric core and the liquid cooling plate is more firm. Such a structure improves the convenience, reliability, stability and safety of the battery pack during assembly, and further ensures the reliability of the vehicle and the safety of the driver and passengers.

Description

Technical Field

[0001] This application relates to the field of vehicles, and more particularly to an insulating film, a battery cell, a battery pack, and a vehicle. Background Technology

[0002] In the battery systems of new energy vehicles, the operating temperature of the battery directly affects the operating efficiency of the battery system, making cooling the battery extremely important. A common method in existing battery systems is to connect a liquid cooling plate to the battery for cooling. During assembly, the battery cells need to be bonded to the liquid cooling plate. However, because the battery cells need to be wrapped with an insulating film, the liquid cooling plate can only adhere to the surface of the insulating film, resulting in insecure cell installation and consequently, poor battery pack stability and low safety. Utility Model Content

[0003] This application provides an insulating film, a battery cell, a battery pack, and a vehicle to address some or all of the shortcomings in the related technologies.

[0004] This application provides an insulating film for use in a battery cell, including a film body and a first window and a second window disposed on the film body.

[0005] The first and second openings are spaced apart and respectively arranged along the width direction of the membrane. The first and second openings are used to allow the adhesive to pass through the membrane and be directly connected to the battery cell.

[0006] Optionally, along the length of the membrane, the first window is located in the middle of the membrane, and the second window is located on opposite sides of the membrane. The second windows on both sides are symmetrically arranged along the central axis of the membrane.

[0007] Optionally, the first window is circular in shape; and / or the second window is elliptical in shape.

[0008] Optionally, the insulating film is made of polypropylene;

[0009] And / or, the insulating film is made of polyethylene terephthalate.

[0010] This application also provides a battery cell, including a body and an insulating film as described above, the insulating film being wrapped around the surface of the body. The body includes a first mounting surface and a second mounting surface disposed opposite to each other. The first opening corresponds to the first mounting surface, and the second opening corresponds to the second mounting surface.

[0011] The first mounting surface is exposed at the first opening, and the second mounting surface is exposed at the second opening, so that the adhesive is connected to the main body at the positions of the first and second openings.

[0012] Optionally, the insulating film includes a first side and a second side disposed opposite to each other. The second window includes a first opening and a second opening. The first opening is disposed on the first side, and the second opening is disposed on the second side. The first side and the second side are connected to each other at the position of the second mounting surface, so that the second mounting surface is exposed through the first opening and the second opening.

[0013] Optionally, both the first and second openings are semi-elliptical shapes with an opening on one side. The first and second sides are connected to each other, and the first and second openings combine to form the second window; or, the first and second sides overlap so that the second mounting surface is exposed from the first and second openings.

[0014] Optionally, the ratio of the area of ​​the first window opening to the area of ​​the first mounting surface is greater than or equal to 0.01 and less than or equal to 1.

[0015] And / or, the ratio of the area of ​​the second window to the area of ​​the second mounting surface is greater than or equal to 0.01 and less than or equal to 1.

[0016] This application also provides a battery pack, including a liquid cooling plate, adhesive members, and battery cells as described above. A plurality of the adhesive members are respectively connected to the body of the battery cell through the first opening and the second opening. The liquid cooling plate is connected to the end of the adhesive members remote from the body.

[0017] This application also provides a vehicle including the battery pack as described above.

[0018] The technical solutions provided by the embodiments of this application may include the following beneficial effects:

[0019] As can be seen from the above embodiments, the insulating film of this application can better expose the mounting surface within a limited area, thereby facilitating the installation of the battery cell and the liquid cooling plate, and making the battery cell connection more secure. This structural design improves the convenience, reliability, stability, and safety of battery pack assembly, and thus ensures the reliability of the vehicle and the safety of the occupants.

[0020] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this application. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of an embodiment of the present application showing an insulating film wrapping around the main body of the battery cell;

[0023] Figure 2 This is another schematic diagram of the insulating film wrapping the main body of the battery cell in one embodiment of this application;

[0024] Figure 3 This is a schematic diagram of the insulating film in an unfolded state according to one embodiment of this application;

[0025] Figure 4 This is a schematic diagram of a rolled insulating film in one embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Battery cell; 11. Main body; 111. First mounting surface; 112. Second mounting surface; 12. Insulating film; 121. Film body; 122. First window; 123. Second window; 1231. First opening; 1232. Second opening; 124. First side; 125. Second side. Detailed Implementation

[0028] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0029] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0030] This application provides a vehicle including a battery pack.

[0031] During vehicle operation, the battery pack provides the power source for the vehicle's operation and supplies power to the vehicle's various electronic modules.

[0032] The battery pack of this application includes a liquid cooling plate, adhesive components, and a battery cell 1. The battery cell 1 includes an insulating film 12, on which a first window 122 and a second window 123 are provided. Multiple adhesive components pass through the first window 122 and the second window 123 respectively and are connected to the body 11 of the battery cell 1. The liquid cooling plate is connected to the end of the adhesive component away from the body 11.

[0033] Figure 1 The diagram shown is a schematic of the insulating film 12 wrapping the main body 11 of the battery cell 1 in one embodiment of this application. Figure 2 The image shown is another schematic diagram of an embodiment of this application, illustrating the insulation film 12 wrapping the main body 11 of the battery cell 1. (See reference) Figure 1 and Figure 2 As can be seen, the battery pack of this application, by setting a first window 122 and a second window 123 on the insulating film 12, allows the main body 11 of the battery cell 1 to be exposed through the first window 122 and the second window 123. This allows the adhesive components of the battery pack to be directly connected to the battery cell 1 through the first window 122 and the second window 123, thereby achieving the connection of the liquid cooling plate. The structure of the insulating film 12 allows the liquid cooling plate of the battery pack to be directly fixed to the main body 11 of the battery cell 1, without having to be connected to the insulating film 12. This avoids situations where the battery cell 1 is not securely connected, leading to low safety performance of the battery pack, thus ensuring the reliability of the battery pack and ensuring the practicality of the vehicle and the safety of the occupants. Furthermore, the setting of the first window 122 and the second window 123 in this application also allows liquid cooling plates to be installed on both sides of the battery cell 1 during battery pack assembly, thereby further controlling the operating temperature of the battery cell 1, improving the working efficiency of the battery pack, and extending its service life.

[0034] The battery cell 1 of this application includes a body 11 and an insulating film 12, the insulating film 12 being wrapped around the surface of the body 11. The body 11 includes a first mounting surface 111 and a second mounting surface 112 disposed opposite to each other. A first opening 122 is disposed corresponding to the first mounting surface 111, and a second opening 123 is disposed corresponding to the second mounting surface 112.

[0035] The first mounting surface 111 is exposed at the first opening 122, and the second mounting surface 112 is exposed at the second opening 123, so that the adhesive is connected to the body 11 at the positions of the first opening 122 and the second opening 123.

[0036] Continue to refer to Figure 1 and Figure 2The first mounting surface 111 of the battery cell 1 is exposed through the first opening 122, and the second mounting surface 112 is exposed through the second opening 123. Therefore, during the battery pack assembly process, adhesive components can be directly installed onto the first mounting surface 111 and the second mounting surface 112 through the first opening 122 and the second opening 123 respectively, thereby connecting to the liquid cooling plate. Thus, the structural design of the battery cell 1 in this application avoids unstable connections with the liquid cooling plate, which could lead to low safety performance of the battery pack, thereby ensuring the reliability of the battery pack and guaranteeing the practicality of the vehicle and the safety of the occupants.

[0037] The insulating film 12 of this application includes a film body 121 and a first window 122 and a second window 123 disposed on the film body 121.

[0038] The first window 122 and the second window 123 are spaced apart and arranged along the width direction of the membrane 121, respectively. The first window 122 and the second window 123 are used to allow the adhesive to pass through the membrane 121 and be directly connected to the battery cell 1.

[0039] Figure 3 The diagram shown is a schematic representation of the insulating film 12 in an unfolded state according to an embodiment of this application. (Refer to...) Figure 3 As can be seen, both the first window 122 and the second window 123 are arranged along the width direction Y of the membrane 121. After the insulating film 12 wraps around the cell 1 body, the first window 122 and the second window 123 also expose the first mounting surface 111 and the second mounting surface 112 of the cell 1 along the width direction Y of the membrane 121, thereby facilitating the installation of the adhesive components. It is evident that the arrangement of the insulating film 12 in this embodiment can better expose the mounting surfaces within a limited area, thus facilitating the installation of the liquid cooling plate. This structural arrangement improves the convenience, reliability, stability, and safety of battery pack assembly, thereby ensuring the reliability of the vehicle and the safety of the occupants.

[0040] In an optional embodiment, along the length of the membrane 121, a first window 122 is disposed in the middle of the membrane 121, and a second window 123 is disposed on opposite sides of the membrane 121. The second windows 123 on both sides are symmetrically arranged along the central axis of the membrane 121.

[0041] Continue to refer to Figure 3Along the length X of the membrane 121, a first window 122 is located in the middle of the membrane 121, and second windows 123 are respectively located on opposite sides of the membrane 121. During the production and assembly of the battery cell 1, it is only necessary to align one side of the membrane 121 with the central axis of the second mounting surface 112 of the battery cell 1, and then wrap the remaining part of the membrane 121 around the main body 11 of the battery cell 1 to complete the installation of the insulating film 12. Alternatively, the first window 122 can be aligned with the first mounting surface 111 first, and then both sides of the insulating film 12 can be wrapped around the main body 11 of the battery cell 1. Therefore, the design of the insulating film 12 in this application effectively improves the convenience and accuracy of its installation process, and increases the work efficiency of the operators during installation.

[0042] Of course, in some other optional embodiments, the positions of the first window 122 and the second window 123 can be adjusted according to specific production conditions and customer needs. For example, the first window 122 and the second window 123 can be designed to be symmetrically distributed along the central axis of the membrane 121, so that the insulating film 12 can be installed starting from the side of the main body 11 of the battery cell 1 during installation; or in embodiments where the battery cell 1 is cylindrical, the distance between the first window 122 and the second window 123 can be limited to 1 / 2 of the circumference of the battery cell 1, etc. Therefore, this application does not impose any limitations on this.

[0043] And in Figure 3 In the illustrated embodiment, since the second opening 123 is disposed on opposite sides of the membrane 121 along the length direction X and symmetrically arranged along the central axis of the membrane 121, during the installation of the battery cell 1, the assembly personnel can more conveniently and quickly align the first opening 122 with the first mounting surface 111 and the second opening 123 with the second mounting surface 112, thereby completing the installation of the entire insulating film 12, effectively improving the convenience and accuracy of the battery cell 1 installation process. Furthermore, Figure 4 The diagram shown is a schematic representation of a rolled insulating film 12 according to an embodiment of this application. (Refer to...) Figure 4 As can be seen, since the insulating film 12 of this application includes second windows 123 on both sides, it is only necessary to cut along the central axis of the second windows 123 during operation, thus providing the operator with a better reference position. Therefore, the structural design of the insulating film 12 of this application not only improves the convenience and accuracy of installation, but also improves the work efficiency of the operator in the installation and cutting process.

[0044] In an optional embodiment, the insulating film 12 includes a first side 124 and a second side 125 disposed opposite to each other. The second window 123 includes a first opening 1231 and a second opening 1232. The first opening 1231 is disposed on the first side 124, and the second opening 1232 is disposed on the second side 125. The first side 124 and the second side 125 are connected to each other at a position on the second mounting surface 112, so that the second mounting surface 112 is exposed through the first opening 1231 and the second opening 1232.

[0045] During the production and assembly of the battery cell 1, it is only necessary to align the first side 124 of the membrane 121 with the central axis of the second mounting surface 112 of the battery cell 1, and then wrap the remaining part of the membrane 121 around the main body 11 of the battery cell 1 in sequence, so that the first opening 1231 and the second opening 1232 combine to form the second window 123, thus completing the installation of the insulating film 12; or, the first window 122 can be aligned with the first mounting surface 111 first, and the first side 124 and the second side 125 of the insulating film 12 can be wrapped around the main body 11 of the battery cell 1 respectively, so that the first opening 1231 and the second opening 1232 combine to form the second window 123. It is evident that the design of the insulating film 12 in this application effectively improves the convenience and accuracy of its installation process, and increases the work efficiency of the operators during the installation process.

[0046] It should be noted that, in optional embodiments, the shapes of the first window 122 and the second window 123 can be set and adjusted according to specific production conditions and customer needs. For example, in embodiments where the cross-section of the adhesive is elongated, the first window 122 and the second window 123 are set as elongated openings extending along the width direction Y of the film 121; or in embodiments where the cross-section of the adhesive is square, the first window 122 and the second window 123 are set as multiple square openings; or in embodiments where the adhesive has multiple strip-shaped cross-sections, the first window 122 and the second window 123 are set as striped openings, etc. Therefore, this application does not impose any limitations on this.

[0047] exist Figure 3 In the optional embodiments described, the first window 122 is circular in shape and the second window 123 is elliptical in shape.

[0048] Based on the positional relationship between the first window 122 and the second window 123 described above, it can be seen that since the first window 122 is directly attached to the first mounting surface 111 in this embodiment, it is set to be circular, so that the adhesive can be directly installed through the first window 122. The second window 123 includes a first opening 1231 and a second opening 1232. The first opening 1231 and the second opening 1232 need to be combined to form the second window 123. Therefore, the first opening 1231 and the second opening 1232 can be set to semi-elliptical shapes respectively, so as to combine into an elliptical second window 123. Of course, in some alternative embodiments, a portion of the first side 124 and the second side 125 may overlap, such that the first opening 1231 and the second opening 1232 form a circular second window 123; or only the first window 122 may be circular, while the second window 123 may be of other shapes; or only the second window 123 may be elliptical, while the first window 122 may be of other shapes, etc. Therefore, this application does not impose any limitations on this.

[0049] Specifically, in an optional embodiment, both the first opening 1231 and the second opening 1232 are semi-elliptical with an opening on one side. The first side 124 and the second side 125 are connected to each other, and the first opening 1231 and the second opening 1232 combine to form the second window 123.

[0050] In this embodiment, the edges of the first side 124 and the second side 125 are connected to each other, so the opening of the first opening 1231 matches the opening of the second opening 1232, thereby forming a complete elliptical second window 123, and then the liquid cooling plate is installed.

[0051] In another optional embodiment, the first side 124 and the second side 125 overlap, so that the second mounting surface 112 is exposed from the first opening 1231 and the second opening 1232. For example, the first opening 1231 and the second opening 1232 can be set into a semi-elliptical shape, which, after overlapping, combines to form a circular second window 123. Of course, the first opening 1231 and the second opening 1232 can also be set into a complete circle or a square, which, after overlapping, also combines to form a circular or square second window 123, thereby exposing the second mounting surface 112 from the first opening 1231 and the second opening 1232. It can be seen that the structural configuration of the second window 123 in this application has the characteristics of diversity and wide adaptability, thus enabling it to be adapted to various different adhesives for installation.

[0052] In an optional embodiment, the insulating film 12 is made of polypropylene. Polypropylene has a low density and light weight, good resistance to chemicals such as acids, alkalis, and salts, and a high melting point (approximately 160°C), allowing it to be used at higher temperatures and ensuring the structural integrity of the battery cell 1 during operation. Furthermore, polypropylene also possesses excellent electrical insulation properties, ensuring safety during the operation of the battery cell 1.

[0053] Of course, the insulating film 12 can also be made of polyethylene terephthalate. Polyethylene terephthalate has high mechanical strength and rigidity, which can provide better mechanical protection for the battery cell 1. It also has good heat resistance, with a melting point of about 250°C. It is also an excellent electrical insulation material, which can ensure the safety of the battery cell 1 during operation.

[0054] In some other alternative embodiments, the insulating film 12 can also be made of a combination of polypropylene and polyethylene terephthalate, thereby better ensuring the performance of the insulating film 12 and improving the safety and practicality of the battery cell 1.

[0055] In optional embodiments, the areas of the first window 122 and the second window 123 can be adjusted according to specific production conditions and customer requirements. For example, in embodiments where only a very small amount of space is needed on the mounting surface of the battery cell 1 to connect the liquid cooling plate, the area of ​​the first window 122 can be set to a ratio of 0.1 or even 0.01 to the area of ​​the first mounting surface 111. Similarly, the area of ​​the second window 123 can also be set to a ratio of 0.1 or 0.01 to the area of ​​the second mounting surface 112. Likewise, where a large area of ​​structural adhesive needs to be pasted on the mounting surface of the battery cell 1 to connect the liquid cooling plate... When cold-pressing the plate, the area of ​​the first window 122 or the second window 123 can be set to a ratio of 0.9 or even 1 to the area of ​​the first mounting surface 111 or the second mounting surface 112, thus completely exposing the first mounting surface 111 or the second mounting surface 112. Of course, in some other optional embodiments, the first window 122 and the second window 123 can be set to different sizes, for example, the area of ​​the first window 122 can be set to a ratio of 0.1 to the first mounting surface 111, and the area of ​​the second window 123 can be set to a ratio of 0.9 to the second mounting surface 112, etc. Therefore, this application does not impose any limitations on this.

[0056] In other words, the ratio of the area of ​​the first window 122 to the area of ​​the first mounting surface 111 is greater than or equal to 0.01 and less than or equal to 1; specifically, it can be 0.01, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, 0.99 or 1.

[0057] Similarly, the ratio of the area of ​​the second window 123 to the area of ​​the second mounting surface 112 is greater than or equal to 0.01 and less than or equal to 1; specifically, it can be 0.01, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, 0.99 or 1.

[0058] The area settings of the first window 122 and the second window 123 in this application enable the battery cell 1 to meet the installation requirements under various conditions. In other words, for adhesives with different structures, shapes, or installation areas, an insulating film 12 with a corresponding window size can be set to meet the connection strength requirements, thereby ensuring the stability and safety of the battery cell 1 after it is connected to the liquid cooling plate. It can be seen that the setting of the insulating film 12 in this application effectively expands the applicability of the battery cell 1 and improves the convenience of the battery cell 1 during the installation process.

[0059] It should be noted that the technical solutions or features described in the above embodiments can be combined or complemented by each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An insulating film applied to a battery cell, characterized in that, include: The membrane body and the first and second openings disposed on the membrane body; The first and second openings are spaced apart and respectively arranged along the width direction of the membrane; the first and second openings are used to allow the adhesive to pass through the membrane and be directly connected to the battery cell; when the insulating film is in the unfolded state, along the length direction of the membrane, the first opening is located in the middle of the membrane, and the second opening is located on opposite sides of the membrane; the second openings on both sides are symmetrically arranged along the central axis of the membrane.

2. The insulating film according to claim 1, characterized in that, The first window is circular in shape; And / or, the shape of the second window is elliptical.

3. The insulating film according to claim 1, characterized in that, The insulating film is made of polypropylene; And / or, the insulating film is made of polyethylene terephthalate.

4. A battery cell, characterized in that, The device includes a main body and an insulating film as described in any one of claims 1-3, the insulating film being wrapped around the surface of the main body; the main body includes a first mounting surface and a second mounting surface disposed opposite to each other; the first window is disposed corresponding to the first mounting surface, and the second window is disposed corresponding to the second mounting surface; The first mounting surface is exposed at the first opening, and the second mounting surface is exposed at the second opening, so that the adhesive is connected to the main body at the positions of the first and second openings.

5. The battery cell according to claim 4, characterized in that, The insulating film includes a first side and a second side disposed opposite to each other; the second window includes a first opening and a second opening; wherein the first opening is disposed on the first side and the second opening is disposed on the second side; The first side and the second side are connected to each other at the position of the second mounting surface, so that the second mounting surface is exposed from the first opening and the second opening.

6. The battery cell according to claim 5, characterized in that, Both the first opening and the second opening are semi-elliptical with an opening on one side; the first side and the second side are connected to each other, and the first opening and the second opening are combined to form the second window; Alternatively, the first side and the second side may be arranged to overlap, so that the second mounting surface is exposed from the first opening and the second opening.

7. The battery cell according to claim 4, characterized in that, The ratio of the area of ​​the first window opening to the area of ​​the first mounting surface is greater than or equal to 0.01 and less than or equal to 1. And / or, the ratio of the area of ​​the second window to the area of ​​the second mounting surface is greater than or equal to 0.01 and less than or equal to 1.

8. A battery pack, characterized in that, The device includes a liquid cooling plate, adhesive components, and a battery cell as described in any one of claims 4-7; wherein a plurality of the adhesive components are respectively connected to the body of the battery cell through the first opening and the second opening; and the liquid cooling plate is connected to the end of the adhesive component away from the body.

9. A vehicle, characterized in that, Includes the battery pack as described in claim 8.

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