Film wrapping structure and square battery

Abstract

The utility model provides an envelope structure and square battery, including shell, big surface membrane, top cover and side membrane, wherein the shell is rectangular three-dimensional, the shell has two big surface, two side and two end face that are opposite to each other; the two large surfaces are coated with large surface films, and the large surface films are folded and attached to the end surfaces; the top cover is arranged corresponding to the end surface and presses the folded part of the large surface film; and the side surface film is connected with the top cover and is folded to cover the side surface. According to the invention, the film for coating is divided into the large surface film and the side surface film, when the shell is coated, the large surface of the shell can be coated firstly, and then the end surface and the side surface of the shell can be coated, so that the large surface film and the side surface film are arranged in a single sheet manner, and the shell is adapted to be arranged in a square sheet shape, so that the cutting is convenient; during production, waste materials are basically not generated, and the application cost can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a film structure and a square battery. Background Art

[0002] Prismatic batteries are a very common type of battery. Due to their flexible design, high energy density, and full utilization of space, they are widely used in electric vehicles and energy storage. At the same time, prismatic batteries also have excellent advantages in thermal management, making it easy to deploy a thermal management system to achieve efficient heat dissipation of the battery.

[0003] The invention patent application with the existing application publication number CN108963177A discloses a lithium battery cell and a method for wrapping a lithium battery cell with an insulating film, wherein the lithium battery cell includes a cover plate, a pole, a connecting piece and at least one winding core, the pole is arranged on the upper surface of the cover plate, and the connecting piece is located between the cover plate and the winding core; one end of the connecting piece is connected to the pole ear of the winding core, and the other end is connected to the pole; the lithium battery cell also includes an insulating film, which is wrapped around the outside of the winding core; the insulating film includes a fixing part and a wrapping part, the fixing part is located in the middle of the insulating film, and the wrapping part is the other part of the insulating film except the fixing part; the fixing part is fixed to the bottom end of the cover plate, and the wrapping part wraps the winding core from the bottom end of the cover plate downward, and the cover plate is fixed above the winding core.

[0004] As in the above scheme, the insulating film is provided with two parts, a fixing part and a wrapping part. When wrapping, the fixing part needs to be connected to the end face of the battery cell first, and then the wrapping part is folded to wrap the large surface and side of the battery cell. This structure causes the insulating film to be irregular in shape as a whole and the structure is relatively complex; this in turn results in more waste during cutting and higher application costs. Utility Model Content

[0005] In view of this, the present invention proposes a simple structure, cost-reducing packaging structure and a square battery to solve the problems of complex insulating film structure and high production cost of existing battery packaging.

[0006] The technical solution of the present utility model is achieved as follows:

[0007] On the one hand, the utility model provides a membrane structure, including a shell, a large membrane, a top cover and a side membrane, wherein:

[0008] The shell is a rectangular three-dimensional shape, and has two opposite large surfaces, two side surfaces and two end surfaces;

[0009] The two large surfaces are covered with large masks, and the large masks are folded and fit the end surfaces;

[0010] The top cover is arranged corresponding to the end surface and presses the folded part of the large mask;

[0011] The side membrane is connected to the top cover and is folded over to cover the side surfaces.

[0012] On the basis of the above technical solution, preferably, the top cover includes a silicone layer, a heat-conducting layer and an insulating layer, wherein:

[0013] One side of the silicone layer fits the end face, as does the portion of the large mask that fits the end face;

[0014] The heat-conducting layer is arranged on the other side of the silicone layer;

[0015] The insulating layer is arranged on a side of the heat-conducting layer away from the silicone layer;

[0016] The end portions of the side films are sandwiched between the silicone layer and the insulating layer.

[0017] On the basis of the above technical solution, preferably, the silicone layer is a sheet structure, and the silicone layer is insulating and thermally conductive silicone.

[0018] On the basis of the above technical solution, preferably, the heat conducting layer is a sheet structure, and the heat conducting layer is made of aluminum foil.

[0019] On the basis of the above technical solution, preferably, the insulating layer is a sheet-like structure, and the insulating layer is made of polyimide or polycarbonate.

[0020] Based on the above technical solution, preferably, the silicone layer and the insulating layer are rectangular sheet structures with equal length and width.

[0021] On the basis of the above technical solution, preferably, the length of the silicone layer is smaller than the length of the insulating layer, and the center point of the silicone layer in the length direction corresponds to the center point of the insulating layer.

[0022] On the other hand, the present invention provides a square battery comprising the above-mentioned envelope structure.

[0023] On the basis of the above technical solution, preferably, the shell is a battery shell, the shell is used to accommodate bare batteries, and the top cover corresponds to the pole lead-out surface of the shell.

[0024] On the basis of the above technical solution, preferably, a pole hole, a marking hole and an explosion-proof valve hole are opened on the top cover.

[0025] The membrane structure and square battery of the present invention have the following advantages over the prior art:

[0026] (1) By setting the coating film into two parts, namely, a large surface film and a side surface film, when coating the shell, the large surface of the shell can be coated first, and then the end surface and side surface of the shell can be coated. In this way, the large surface film and the side surface film are both set as a single piece, and can be adapted to the shell to be set as a square sheet, which is convenient for cutting, and basically no waste is generated during production, which can effectively reduce the application cost;

[0027] (2) In this membrane structure, the side membrane and the top cover are integrated. When wrapping, the top cover can be used to press the folded part of the large membrane to ensure that the large membrane is fitted and stable. The side membrane can then be folded for wrapping. The assembly of the top cover realizes the positioning of the side membrane, which can ensure that the side membrane is well fitted with the side of the shell.

[0028] (3) The top cover includes a silicone layer, a heat-conducting layer and an insulating layer. When used, the silicone layer can be used for heat conduction to cooperate with the heat-conducting layer to achieve good heat dissipation. At the same time, the silicone layer and the insulating layer clamp the side film to ensure the stability of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A three-dimensional diagram of the envelope structure of the present invention;

[0031] Figure 2 This is an exploded view of the envelope structure of the present invention;

[0032] Figure 3 This is a top cover structure diagram of the envelope structure of the present utility model;

[0033] Figure 4 This is a top cover structure diagram of the second embodiment of the membrane structure of the present invention;

[0034] In the figure: 1. Shell; 101. Large surface; 102. Side surface; 103. End surface; 2. Large surface mask; 3. Top cover; 31. Silicone layer; 32. Heat-conducting layer; 33. Insulating layer; 301. Pole hole; 302. Identification hole; 303. Explosion-proof valve hole; 4. Side membrane. DETAILED DESCRIPTION

[0035] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] like Figures 1 to 4 As shown, the membrane structure of the present invention includes a shell 1, a large membrane 2, a top cover 3 and a side membrane 4.

[0037] The square battery of the utility model includes the above-mentioned membrane structure.

[0038] Example 1

[0039] like Figure 1 and Figure 2 As shown, the shell 1 is a rectangular three-dimensional shape, and has two opposite large surfaces 101, two side surfaces 102 and two end surfaces 103; the two large surfaces 101 are covered with a large mask 2, and the large mask 2 is folded to fit the end surfaces 103; the top cover 3 is arranged corresponding to the end surfaces 103 and presses the folded portion of the large mask 2; the side membrane 4 is connected to the top cover 3 and is folded to cover the side surfaces 102;

[0040] As shown in the above structure, the large surface 101, side surface 102 and end surface 103 of the shell 1 are all rectangular structures. When cutting the large surface film 2 and the side film 4, they can be cut into regular square sheet structures, effectively reducing the generation of waste;

[0041] When covering, the large mask 2 is attached to the large surface 101 and partially folded to cover the end surface 103. Then, the top cover 3 is installed corresponding to the end surface 103 so that the top cover 3 is pressed on the folded part of the large mask 2. Then, the side film 4 is pressed to cover the side 102 of the shell 1.

[0042] In this wrapping structure, the side membrane 4 and the top cover 3 are integrated, so that when wrapping, the folded part of the large mask 2 can be pressed by relying on the top cover 3, thereby ensuring that the large mask 2 fits stably, and then the side membrane 4 is folded for wrapping; the assembly of the top cover 3 realizes the positioning of the side membrane 4, which can ensure that the side membrane 4 fits well with the side surface 102 of the shell.

[0043] like Figure 3 and Figure 4As shown, the top cover 3 includes a silicone layer 31, a heat-conducting layer 32 and an insulating layer 33, wherein one side of the silicone layer 31 is in contact with the end surface 103, and the portion of the large face mask 2 is in contact with the end surface 103; the heat-conducting layer 32 is provided on the other side of the silicone layer 31; the insulating layer 33 is provided on the side of the heat-conducting layer 32 away from the silicone layer 31; the end of the side film 4 is clamped between the silicone layer 31 and the insulating layer 33;

[0044] As shown in the above structure, when the top cover 3 is set, the heat conductive layer 32 and the side film 4 are sandwiched by the silicone layer 31 and the insulating layer 33. In this way, after the top cover 3 is docked on the shell 1, the side film 4 can be covered;

[0045] The silicone layer 31 can achieve good thermal conductivity to transfer heat to the heat-conducting layer 32, and then dissipate heat through the heat-conducting layer 32;

[0046] Specifically, the silicone layer 31 is a sheet-like structure, and the silicone layer 31 is insulating and heat-conductive silicone;

[0047] As shown in the above structure, the silicone layer 31 is set in a sheet shape and uses insulating thermal conductive silicone. In this way, the silicone layer 31 can transfer the heat on the housing 1 to the thermal conductive layer 32 to ensure the heat dissipation effect;

[0048] Specifically, the heat conducting layer 32 is a sheet-like structure, and the heat conducting layer 32 is made of aluminum foil;

[0049] As in the above structure, the heat-conducting layer 32 is made of aluminum foil, which has a good heat-conducting effect, thereby ensuring the transfer of heat on the top cover 3 to facilitate the heat dissipation work.

[0050] Specifically, the insulating layer 33 is a sheet-like structure;

[0051] As described above, the insulating layer 33 is adapted to the structure of the heat-conducting layer 32 and is provided in a sheet shape to ensure good adhesion to the heat-conducting layer 32 and the folded end portion of the side film 4, and is also used for insulation to improve application reliability.

[0052] In this structure, the insulating layer 33 can be made of polyimide or polycarbonate, and can be configured to be flexible or rigid.

[0053] Specifically, the silicone layer 31 and the insulating layer 33 are rectangular sheet structures with equal length and width, so as to ensure uniformity of specifications and facilitate production, processing and control.

[0054] like Figure 1 and Figure 2 As shown, this film structure is applied to square shell batteries. The shell 1 is a battery shell, which is used to accommodate bare cells. The top cover 3 corresponds to the pole lead-out surface of the shell 1.

[0055] As in the above structure, when assembling the battery, the bare cell is installed in the shell 1, covered with the large mask 2, and then the top cover 3 is installed corresponding to the pole on the bare cell.

[0056] Suitably, the top cover 3 is provided with a pole hole 301, a marking hole 302 and an explosion-proof valve hole 303;

[0057] As shown in the above structure, the pole hole 301 is used for the pole of the bare battery cell to pass through, the identification hole 302 is used to set a scanning identification such as a QR code, and the explosion-proof valve hole 303 is used to install an explosion-proof valve to achieve pressure relief and explosion-proof work.

[0058] Example 2

[0059] The difference between this embodiment and the first embodiment is that the length of the silicone layer 31 is different;

[0060] like Figure 4 As shown, the length of the silicone layer 31 is smaller than the length of the insulating layer 33, and the center point of the length direction of the silicone layer 31 corresponds to the center point of the insulating layer 33;

[0061] As in the above structure, by setting the silicone layer 31 shorter than the insulating layer 33, it is convenient to fold the side membrane 4 so that the corners of the side membrane 4 do not protrude after folding, thereby reducing the risk of wear and tear to ensure the stability of the application.

[0062] Specific implementation steps:

[0063] First, assemble the bare battery cell in the shell 1, then fit the large mask 2 on the large surface 101, and fold part of the large mask 2 to fit the end surface 103, and then connect the top cover 3 to the shell 1. At this time, the top cover 3 supports the end surface 103 and the folded part of the large mask 2 through the silicone layer 31, and then fold the side film 4 to fit the side 102 of the shell 1.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A membrane structure, characterized in that: It comprises a shell (1), a large face mask (2), a top cover (3) and a side face mask (4), wherein: The housing (1) is in a rectangular three-dimensional shape, and has two opposite large surfaces (101), two side surfaces (102), and two end surfaces (103); The two large surfaces (101) are covered with the large surface masks (2), and the large surface masks (2) are folded and attached to the end surfaces (103); The top cover (3) is arranged corresponding to the end surface (103) and presses the folded portion of the large mask (2); The side membrane (4) is connected to the top cover (3) and is folded over to cover the side surface (102).

2. The envelope structure according to claim 1, wherein: The top cover (3) comprises a silica gel layer (31), a heat-conducting layer (32) and an insulating layer (33), wherein: One side of the silicone layer (31) is in contact with the end surface (103), and a portion of the large mask (2) is in contact with the end surface (103); The heat-conducting layer (32) is arranged on the other side of the silicone layer (31); The insulating layer (33) is arranged on a surface of the heat-conducting layer (32) away from the silicone layer (31); The end portion of the side film (4) is clamped between the silicone layer (31) and the insulating layer (33).

3. The envelope structure according to claim 2, wherein: The silica gel layer (31) is a sheet-like structure, and the silica gel layer (31) is insulating and heat-conducting silica gel.

4. The envelope structure according to claim 2, wherein: The heat-conducting layer (32) is a sheet-like structure, and the heat-conducting layer (32) is made of aluminum foil.

5. The envelope structure according to claim 2, wherein: The insulating layer (33) is a sheet-like structure, and the insulating layer (33) is made of polyimide material or polycarbonate material.

6. The envelope structure according to any one of claims 2 to 5, characterized in that: The silica gel layer (31) and the insulating layer (33) are rectangular sheet structures with equal length and width.

7. The envelope structure according to any one of claims 2 to 5, characterized in that: The length of the silicone layer (31) is smaller than the length of the insulating layer (33), and the center point of the silicone layer (31) in the length direction corresponds to the center point of the insulating layer (33).

8. A square battery, characterized in that: The invention comprises the envelope structure according to any one of claims 1 to 7.

9. The square battery according to claim 8, wherein: The shell (1) is a battery shell, and the shell (1) is used to accommodate a bare battery cell. The top cover (3) corresponds to the pole lead-out surface of the shell (1).

10. The square battery according to claim 9, wherein: The top cover (3) is provided with a pole hole (301), a marking hole (302) and an explosion-proof valve hole (303).

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