Battery with enveloping structure and battery box

Abstract

The utility model belongs to the technical field of battery manufacturing, and discloses a battery with a film coating structure and a battery box, the battery with the film coating structure comprises a plurality of battery cells, and further comprises a protective film and a connecting fixing piece, each battery cell comprises a shell, the shell comprises a bottom surface, two oppositely arranged first side surfaces and two oppositely arranged second side surfaces, the first side face and the second side face are connected with the bottom face, and the area of the first side face is larger than that of the second side face. The protective film wraps the outer side of the shell and comprises a first wrapping film, a second wrapping film and a third wrapping film, the first wrapping film completely wraps the first side face, the second wrapping film partially wraps the second side face to form a first exposed opening, and the third wrapping film partially wraps the bottom face to form a second exposed opening; and the connecting and fixing pieces are respectively arranged on the two second side surfaces of the battery cells and are fixedly connected with the at least two battery cells. The anti-vibration strength of the battery cell and the connection strength of the battery cell and the battery box can be effectively enhanced, and the stability of the whole battery box is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery manufacturing technical field especially relates to a battery with envelope structure and battery box. BACKGROUND

[0002] At present, there are some problems in the CTP (Cell to Pack, module-free battery pack technology) system in the industry. Among them, in the battery box design using the CTP system, the battery cell and the box are usually only bonded by the bottom structure adhesive, and in order to protect and insulate the battery cell, an insulating film is usually wrapped outside the shell of the battery cell. The bonding strength between the insulating film and the battery box is limited, and when the battery box is subjected to vibration, the force generated during the vibration process can easily cause the bonding adhesive between the insulating film and the battery box to fall off and lose its original fixing effect. Once the bonding adhesive fails, the connection between the battery cell and the box becomes unstable, which can further lead to serious consequences such as disintegration of the battery pack.

[0003] In addition, during the cycle use of the battery, the battery cell expands, causing the thickness of the battery cell to gradually increase. This increase in thickness can cause the entire battery cell to move upward away from the bottom of the battery box, which is manifested as the expansion of the battery cell arching upward. This expansion of the battery cell arching upward can pull the adhesive between the bottom of the battery cell and the battery box, exacerbating the falling off of the adhesive at the bottom and losing its original fixing effect, causing the connection between the battery cell and the battery box to be unstable and affecting the overall stability of the battery box. SUMMARY

[0004] The utility model aims at providing a battery with envelope structure and battery box, which can effectively enhance the vibration resistance of the battery cell and the connection strength between the battery cell and the battery box, and improve the stability of the overall battery box.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] On the one hand, a battery with envelope structure is provided, which includes a plurality of battery cells, a protective film and a connecting and fixing member. The battery cell includes a shell, the shell includes a bottom surface, two oppositely arranged first side surfaces and two oppositely arranged second side surfaces, the first side surfaces and the second side surfaces are connected with the bottom surface respectively, and the area of the first side surface is greater than that of the second side surface.

[0007] The protective film is wrapped on the outer side of the shell, the protective film includes a first envelope, a second envelope and a third envelope, the first envelope completely wraps the first side surface, the second envelope partially wraps the second side surface to form a first exposed opening on the second side surface, and the third envelope partially wraps the bottom surface to form a second exposed opening on the bottom surface.

[0008] The connecting fixtures are arranged on the two second sides of the battery cell respectively, and the connecting fixtures are fixedly connected with the first exposed opening of the at least two battery cells.

[0009] In one of the embodiments, a first rounded corner connecting part is arranged at the connection between the first side and the second side, and the protective film further comprises a first rounded corner coating film for coating the first rounded corner connecting part.

[0010] In one of the embodiments, the width of the second side is L, the protective film of the first side is arranged to extend along the first exposed opening of the second side, and the extension distance is D, 2mm < D ≤ 30%L.

[0011] In one of the embodiments, a second rounded corner connecting part is arranged between the first side and the bottom surface, and the protective film further comprises a second rounded corner coating film for coating the second rounded corner connecting part.

[0012] In one of the embodiments, a third rounded corner connecting part is arranged between the second side and the bottom surface, the third rounded corner connecting part comprises a first connecting end connected with the second side and a second connecting end connected with the bottom surface, and the protective film further comprises a third rounded corner coating film for coating the first connecting end.

[0013] In one of the embodiments, the height of the second side is H, the length of the first exposed opening along the height direction of the second side is h, and 80%H < h < 100%H.

[0014] In one of the embodiments, the battery cell further comprises a top surface, the top surface is welded with the first side, and the protective film coats the welding seam between the top surface and the first side.

[0015] In one of the embodiments, the first coating film of one of the first sides is arranged to extend towards the second side to form a first sub-film, the first coating film of another of the first sides is arranged to extend towards the same second side to form a second sub-film, the first sub-film and the second sub-film form the second coating film on the second side, the edges of the first sub-film and the second sub-film abut each other, or the first sub-film and the second sub-film partially overlap.

[0016] In another aspect, a battery box is also provided for the battery with the coating film structure, and the battery box comprises a box body, the box body is provided with a containing cavity for placing a plurality of battery cells, and the bottom surface of the battery cell is fixedly connected with the bottom plate of the box body through structural adhesive.

[0017] In one of the embodiments, the second side of the electric core is connected and fixed with the side plate of the box through the connecting and fixing member.

[0018] The battery with the film wrapping structure has the advantages that:

[0019] The battery with the film wrapping structure has the advantages that:

[0020] Further, in the use process of the electric core, the first side with a larger area on the shell of the electric core is more prone to swelling than the second side, and by further providing the connecting and fixing member on the two second sides of the electric core, the connection stability of the electric core and the connecting and fixing member is facilitated. The connecting and fixing member is fixedly connected with at least two electric cores, so that the at least two electric cores are fixedly connected through the connecting and fixing member, the connection strength between the electric cores is improved, and the ability of the electric core to resist swelling and arching is effectively improved. Moreover, by providing the first exposed opening on the second side, the second side of the shell is directly fixedly connected with the connecting and fixing member, which is conducive to improving the connection strength between the second side and the connecting and fixing member, further improving the connection strength between the electric cores, and thus improving the overall stability of the battery box. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic view of the battery with the film wrapping structure in one of the embodiments;

[0022] Figure 2 is Figure 1 is an enlarged structural schematic view of part A in the battery with the film wrapping structure;

[0023] Figure 3 is a structural schematic view of the second side in one of the embodiments;

[0024] Figure 4 is a structural schematic view of the bottom surface in one of the embodiments;

[0025] Figure 5 is a connection structural schematic view of the multiple electric cores and the connecting and fixing member in one of the embodiments;

[0026] Figure 6 is a partial sectional structural schematic view of the battery box in one of the embodiments;

[0027] Figure 7 is a partial cross-sectional structural schematic view of another perspective of the battery box in one embodiment.

[0028] In the drawings:

[0029] 100, cell; 110, shell; 111, bottom surface; 1111, second exposed opening; 112, first side surface; 113, second side surface; 1131, first exposed opening; 114, first rounded corner connecting portion; 115, second rounded corner connecting portion; 116, third rounded corner connecting portion; 1161, first connecting end; 1162, second connecting end; 117, top surface; 118, weld; 200, protective film; 210, first wrapping film; 211, first sub-film; 212, second sub-film; 213, overlapping area; 220, second wrapping film; 230, third wrapping film; 240, first rounded corner wrapping film; 250, second rounded corner wrapping film; 260, third rounded corner wrapping film; 300, connecting fixing member; 310, insulating plate; 400, structural adhesive;

[0030] 1, box; 11, accommodating cavity; 12, bottom plate; 13, side plate. DETAILED DESCRIPTION

[0031] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are merely used to explain the utility model and are not a limitation on the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0032] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0033] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0034] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0035] As shown in Figures 1 to 5 The battery with a film structure of the present embodiment includes a plurality of battery cells 100, a protective film 200, and a connecting and fixing member 300. The battery cell 100 includes a shell 110, which includes a bottom surface 111, two oppositely arranged first side surfaces 112, and two oppositely arranged second side surfaces 113. The first side surfaces 112 and the second side surfaces 113 are connected to the bottom surface 111, respectively. The area of the first side surface 112 is larger than that of the second side surface 113. The protective film 200 is wrapped on the outside of the shell 110. The protective film 200 includes a first film 210, a second film 220, and a third film 230. The first film 210 completely wraps the first side surface 112. The second film 220 partially wraps the second side surface 113 to form a first exposed opening 1131 on the second side surface 113. The third film 230 partially wraps the bottom surface 111 to form a second exposed opening 1111 on the bottom surface 111. The connecting and fixing member 300 is arranged on the two second side surfaces 113 of the battery cell 100, respectively. The connecting and fixing member 300 is fixedly connected to the first exposed opening 1131 of at least two battery cells 100.

[0036] In the present embodiment, the protective film is wrapped on the outside of the shell 110 of the battery cell 100 to insulate and protect the shell 110. The protective film 200 includes a first film 210, a second film 220, and a third film 230. The third film 230 partially wraps the bottom surface 111 of the shell 110 to form a second exposed opening 1111 on the bottom surface 111. In actual operation, the bottom surface 111 of the shell 110 is fixedly bonded to the box body 1 of the battery box by a structural adhesive 400. The second exposed opening 1111 of the bottom surface 111 is directly bonded to the box body 1 by the structural adhesive 400. This is conducive to improving the bonding strength between the bottom surface 111 and the box body 1, and can improve the connection stability of the battery cell 100 and the box body 1, and improve the overall stability of the battery box.

[0037] Further, during use of the battery cell 100, the first side 112 of the shell 110 of the battery cell 100 is more prone to swelling than the second side 113. By further providing the connecting and fixing member 300 on the two second sides 113 of the battery cell 100, the connection stability of the battery cell 100 and the connecting and fixing member 300 is ensured. The connecting and fixing member 300 is fixedly connected with at least two battery cells 100, so that the at least two battery cells 100 are fixedly connected by the connecting and fixing member 300, the connection strength between the battery cells 100 is improved, and the ability of the battery cell 100 to resist swelling and arching is effectively improved. In addition, by providing the first exposed opening 1131 on the second side 113, the second side 113 of the shell 110 is directly fixedly connected with the connecting and fixing member 300, which is conducive to improving the connection strength between the second side 113 and the connecting and fixing member 300, further improving the connection strength between the battery cells 100, and thus improving the overall stability of the battery box.

[0038] Further, the connecting and fixing member 300 can be a heat insulation pad, a heat insulation plate, an insulating pad, an insulating plate 310, or a structural adhesive 400, etc. As shown in FIG. 8, in actual operation, the connecting and fixing member 300 is provided as an insulating plate 310, and the insulating plate 310 and the second side 113 are fixedly bonded by the structural adhesive 400. The plurality of battery cells 100 are fixedly connected together by the insulating plate 310, the connection strength between the battery cells 100 is improved, the overall anti-arching ability of the battery cell 100 is improved, and the stability of the battery cell 100 is improved. Figure 5

[0039] Further, the projection of the first exposed opening 1131 on the connecting and fixing member 300 completely falls within the edge range of the connecting and fixing member 300, so that the connecting and fixing member 300 can completely enclose the first exposed opening 1131, avoiding the direct exposure of the shell 110 of the battery cell 100 during use, and improving the protection effect of the battery cell 100.

[0040] In one embodiment, the connection between the first side 112 and the second side 113 is provided with a first rounded corner connection portion 114, and the protective film 200 further includes a first rounded corner film 240 for covering the first rounded corner connection portion 114, so as to effectively protect the first rounded corner connection portion 114 by covering it with the first rounded corner film 240, thereby improving the protection effect of the connection between the first side 112 and the second side 113 and improving the protection effect of the protective film 200 on the battery cell 100.

[0041] ​In one of the embodiments, the width of the second side surface 113 is set as L, the protective film 200 is arranged to extend along the first exposed opening 1131 of the second side surface 113, and the extension distance is D, 2mm<D≤30%L, so that the second side surface 113 can be effectively protected by the protective film 200 near the edges of the two first side surfaces 112, avoiding direct contact between the adjacent two battery cells 100 or between the battery cell 100 and the external battery box, and being conducive to improving the protection level of the battery cell 100. At the same time, in actual operation, the extension distance of the protective film 200 at the first exposed opening 1131 is kept within a certain range, so that the first exposed opening 1131 has sufficient area to ensure the connection stability of the second side surface 113 and the connecting and fixing member 300.

[0042] In one of the embodiments, a second round corner connecting portion 115 is arranged between the first side surface 112 and the bottom surface 111, and the protective film 200 further comprises a second round corner coating film 250 for coating the second round corner connecting portion 115, so as to effectively protect the second round corner connecting portion 115 through the second round corner coating film 250, that is, to improve the protection effect of the connecting portion between the first side surface 112 and the bottom surface 111, and further improve the protection effect of the protective film 200 on the battery cell 100.

[0043] In one of the embodiments, a third round corner connecting portion 116 is arranged between the second side surface 113 and the bottom surface 111, the third round corner connecting portion 116 comprises a first connecting end 1161 connected with the second side surface 113 and a second connecting end 1162 connected with the bottom surface 111, and the protective film 200 further comprises a third round corner coating film 260 for coating the first connecting end 1161, so as to effectively protect the first connecting end 1161 through the third round corner coating film 260, avoiding direct contact between the opposite second side surfaces 113 of the adjacent two battery cells 100 or between the second side surface 113 and the battery box, and further improving the protection effect of the protective film 200 on the battery cell 100. At the same time, the second connecting end 1162 connected with the bottom surface 111 is not provided with the protective film 200, so as to ensure that the bottom surface 111 has a large enough area of the second exposed opening 1111, thereby improving the bonding strength of the bottom surface 111 and the battery box, improving the anti-arching ability of the battery cell 100, and improving the overall stability of the battery box.

[0044] In one of the embodiments, the height of the second side surface 113 is set as H, the length of the first exposed opening 1131 along the height direction of the second side surface 113 is set as h, and 80%H<h<100%H, so as to ensure that the first exposed opening 1131 has a certain length in the height direction of the second side surface 113, and also as much as possible to ensure that the first exposed opening 1131 has sufficient area, thereby ensuring the connection stability of the second side surface 113 and the connecting and fixing member 300.

[0045] In one embodiment, the battery cell 100 further comprises a top surface 117 welded to the first side surface 112, and the protective film 200 covers the weld 118 between the top surface 117 and the first side surface 112 to effectively protect the joint between the top surface 117 and the first side surface 112 by the protective film 200. Specifically, in actual operation, the first film 210 and the second film 220 are extended to cover the top surface 117, so that the protective film 200 is continuously wrapped around the shell 110, which helps to improve the tightness of the protective film 200 wrapped around the battery cell 100 and ensure the protection effect of the protective film 200.

[0046] In one embodiment, as shown in Figure 2 and Figure 3 , the first film 210 of one first side surface 112 is extended towards the second side surface 113 to form a first sub-film 211, and the first film 210 of another first side surface 112 is extended towards the same second side surface 113 to form a second sub-film 212. The first sub-film 211 and the second sub-film 212 form the second film 220 wrapped around the second side surface 113, and the edges of the first sub-film 211 and the second sub-film 212 abut to avoid leaving gaps between the first sub-film 211 and the second sub-film 212, which affects the protection effect of the protective film 200 on the shell 110.

[0047] In particular, during the wrapping process, due to the errors that may occur during the manufacturing and cutting of the protective film 200, the extension length of the first sub-film 211 and the second sub-film 212 is set to be greater than the width of the second side surface 113, so that the first sub-film 211 and the second sub-film 212 partially overlap when wrapped around the second side surface 113, forming an overlapping area 213 on the second side surface 113, which effectively ensures the complete adhesion between the first sub-film 211 and the second sub-film 212 and improves the protection effect of the protective film 200 on the battery cell 100. Further, in actual operation, the top of the battery cell 100 is more likely to come into contact with adjacent battery cells 100, battery boxes or external components, so in this embodiment, the first sub-film 211 and the second sub-film 212 are respectively arranged at the top of the two first films 210, thereby ensuring that the top of the second side surface 113 is wrapped and improving the protection effect of the top of the battery cell 100.

[0048] On the other hand, as shown in Figure 6 and Figure 7As shown, the battery box is also provided for the battery with the envelope structure, further comprising a box body 1, the box body 1 is provided with a containing cavity 11 for placing a plurality of battery cells 100, and the bottom surface 111 of the battery cell 100 is fixedly connected with the bottom plate 12 of the box body 1 through the structural adhesive 400. The second exposed opening 1111 of the bottom surface 111 is directly connected with the bottom plate 12 of the box body 1, which is beneficial to improve the bonding strength between the battery cell 100 and the box body 1, thereby effectively preventing the swelling and arching phenomenon of the battery cell 100 and ensuring the overall stability of the battery box.

[0049] In one embodiment, the second side surface 113 of the battery cell 100 is fixedly connected with the side plate 13 of the box body 1 through the connecting fixing member 300, thereby further improving the connection stability between the battery cell 100 and the box body 1, and the second side surface 113 of the battery cell 100 is limited by the connecting fixing member 300 and the side plate 13 of the box body 1, which can effectively inhibit the swelling of the second side surface 113, ensure the stability of the battery cell 100 along the second side surface 113, and further improve the overall stability of the battery box. The connecting fixing member 300 is fixedly connected with the side plate 13 of the box body 1 and the battery cell 100, respectively, and in actual operation, the connecting fixing member 300 can be fixedly connected with the box body 1 by welding, riveting, bolt connection or bonding, and the connecting fixing member 300 is fixedly connected with the battery cell 100 by the structural adhesive, or the structural adhesive 400 is directly used as the connecting fixing member 300, as long as the above-mentioned fixed connection can be realized to ensure the connection stability between the battery cell 100 and the battery cell 100 and between the battery cell 100 and the box body 1, and such design belongs to the protection scope of the present application.

[0050] Obviously, the above-mentioned embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery having a structure of a film, characterized by, The application relates to a battery cell (100) and a battery (1000) comprising the same. The battery cell (100) comprises a shell (110) including a bottom surface (111), two oppositely arranged first side surfaces (112) and two oppositely arranged second side surfaces (113), wherein the first side surfaces (112) and the second side surfaces (113) are connected with the bottom surface (111), and the area of the first side surfaces (112) is greater than that of the second side surfaces (113). A protective film (200) is arranged on the outer side of the shell (110), and the protective film (200) comprises a first film (210), a second film (220) and a third film (230), wherein the first film (210) completely covers the first side surfaces (112), the second film (220) partially covers the second side surfaces (113) to form first exposed openings (1131) on the second side surfaces (113), and the third film (230) partially covers the bottom surface (111) to form second exposed openings (1111) on the bottom surface (111). A connecting and fixing member (300) is arranged on each of the two second side surfaces (113) of the battery cell (100), and the connecting and fixing member (300) is fixedly connected with the first exposed openings (1131) of the at least two battery cells (100).

2. The battery having an envelope structure according to claim 1, wherein The connecting part of the first side surface (112) and the second side surface (113) is provided with a first rounded corner connecting part (114), and the protective film (200) further comprises a first rounded corner film (240) for covering the first rounded corner connecting part (114).

3. The battery having an envelope structure according to claim 2, wherein, The width of the second side surface (113) is L, the protective film (200) of the first side surface (112) is arranged along the first exposed opening (1131) of the second side surface (113) and extends by a distance D, and 2mm < D < 30%L.

4. The battery having an envelope structure according to any one of claims 1 to 3, characterized by, The second rounded corner connecting part (115) is arranged between the first side surface (112) and the bottom surface (111), and the protective film (200) further comprises a second rounded corner film (250) for covering the second rounded corner connecting part (115).

5. The battery having an envelope structure according to any one of claims 1 to 3, wherein The third rounded corner connecting part (116) is arranged between the second side surface (113) and the bottom surface (111), and the third rounded corner connecting part (116) comprises a first connecting end (1161) connected with the second side surface (113) and a second connecting end (1162) connected with the bottom surface (111), and the protective film (200) further comprises a third rounded corner film (260) for covering the first connecting end (1161).

6. The battery having an envelope structure according to any one of claims 1 to 3, wherein The height of the second side surface (113) is H, the length of the first exposed opening (1131) along the height direction of the second side surface (113) is h, and 80%H < h < 100%H.

7. The battery having an envelope structure according to any one of claims 1 to 3, characterized by, The electric core (100) further comprises a top surface (117) welded to the first side surface (112), and the protective film (200) covers the weld joint (118) between the top surface (117) and the first side surface (112).

8. The battery having an envelope structure according to any one of claims 1 to 3, characterized by, The first film (210) of one of the first side surfaces (112) extends towards the second side surface (113) to form a first sub-film (211), and the first film (210) of the other first side surface (112) extends towards the same second side surface (113) to form a second sub-film (212), the first sub-film (211) and the second sub-film (212) cover the second side surface (113) to form the second film (220), and the edges of the first sub-film (211) and the second sub-film (212) abut each other, or the first sub-film (211) and the second sub-film (212) partially overlap.

9. A battery box characterized by The battery with the film structure as claimed in any one of claims 1 to 8 further comprises a box (1) provided with a receiving cavity (11) for placing a plurality of the electric cores (100), and the bottom surface (111) of the electric core (100) is fixedly connected to the bottom plate (12) of the box (1) by the structural adhesive (400).

10. The battery pack of claim 9, wherein, The second side surface (113) of the electric core (100) is fixedly connected to the side plate (13) of the box (1) by the connecting fixing member (300).

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