Battery cell and battery with same

Abstract

The single battery comprises a pole group, a shell, an anti-explosion valve and a protective film, the pole group is mounted in the shell, an anti-explosion hole is formed in the shell, the anti-explosion valve is mounted on the anti-explosion hole, the protective film wraps the outer surface of the shell, and an avoiding hole opposite to the anti-explosion valve is formed in the protective film; wherein the shell is provided with a first positioning structure, and the protective film is provided with a second positioning structure opposite to the first positioning structure. According to the battery monomer disclosed by the utility model, the first positioning structure is arranged on the shell, and the second positioning structure opposite to the first positioning structure is arranged on the protective film, so that when the protective film is pasted, the protective film can be better pasted, and the avoiding hole of the pasted protective film can be better aligned to the anti-explosion valve; therefore, high-temperature and high-pressure gas can be smoothly discharged after the anti-explosion valve is opened, and the risk of fire and explosion of the single battery can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic batteries, in particular to a battery monomer and a battery having the same. Background Art

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing.

[0003] Lithium cells are the core components of battery pack safety and assembly, and their structural design is crucial to cell safety. In the related technology, lithium cells cover the explosion-proof valve inside the insulating film, which will affect the normal opening of the explosion-proof valve, and the film coating equipment is also difficult to accurately identify the contour line of the explosion-proof valve, resulting in a low film coating yield, which is not conducive to the automatic production of the film coating equipment, and the cost of scrap and rework is high. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery cell that can be well attached to the protective film and can also facilitate the smooth discharge of high-temperature and high-pressure gas after the explosion-proof valve is opened.

[0005] According to an embodiment of the utility model, the battery cell includes: a pole group; a shell, the pole group is installed in the shell, and the shell is provided with an explosion-proof hole; an explosion-proof valve, the explosion-proof valve is installed on the explosion-proof hole; a protective film, the protective film is wrapped around the outer surface of the shell, and the protective film is provided with an avoidance hole opposite to the explosion-proof valve; wherein a first positioning structure is provided on the shell, and a second positioning structure opposite to the first positioning structure is provided on the protective film.

[0006] According to the battery cell of the embodiment of the utility model, a first positioning structure is provided on the shell, and a second positioning structure opposite to the first positioning structure is provided on the protective film. When the protective film is pasted, the protective film can be better pasted through the mutual positioning cooperation between the first positioning structure and the second positioning structure, and the avoidance hole of the protective film after pasting can be better aligned with the explosion-proof valve, so that the high-temperature and high-pressure gas can be discharged smoothly after the explosion-proof valve is opened, thereby reducing the risk of fire and explosion of the battery cell.

[0007] In addition, the battery cell according to the utility model may also have the following additional technical features:

[0008] In some embodiments of the present invention, the first positioning structure is a positioning mark arranged on the outer surface of the shell, and the second positioning structure is a through hole opposite to the positioning mark, and the shape of the through hole is the same as that of the positioning mark.

[0009] In some embodiments of the present invention, the positioning mark is a pattern etched on the outer surface of the shell.

[0010] In some embodiments of the present invention, a plurality of the positioning marks are provided, a plurality of the through holes are provided, and the plurality of the positioning marks correspond one-to-one to the plurality of the through holes.

[0011] In some embodiments of the present invention, the distance L1 between the outer periphery of the positioning mark and the inner periphery of the through hole satisfies: 0mm≤L1≤1.5mm, and / or the distance L2 between the explosion-proof valve and the avoidance hole satisfies: 0.2mm<L2<4mm.

[0012] In some embodiments of the present invention, the positioning mark and the explosion-proof valve are located on the same wall panel of the shell.

[0013] In some embodiments of the present invention, a plurality of positioning marks are provided on the wall plate, and the plurality of positioning marks are respectively provided on both sides of the explosion-proof valve.

[0014] In some embodiments of the present invention, the battery cell also includes a support block, which is made of structural adhesive and is bonded to the shell through the through hole. The support block is used to separate the shell from the protective shell of the battery to construct an exhaust space between the explosion-proof valve and the protective shell.

[0015] In some embodiments of the present invention, the shell includes a shell body and a cover plate, the shell body has openings at both ends, the cover plate is installed at the openings, the explosion-proof hole is located on the shell body, and a pole is installed on the cover plate.

[0016] The utility model also provides a battery having the battery monomer of the above embodiment.

[0017] According to the embodiment of the utility model, the battery includes a protective shell and an electrode assembly installed in the protective shell, the electrode assembly includes a plurality of battery cells, and a first positioning structure is provided on the shell, and a second positioning structure opposite to the first positioning structure is provided on the protective film. When the protective film is pasted, the protective film can be better pasted through the mutual positioning cooperation between the first positioning structure and the second positioning structure, and the avoidance hole of the pasted protective film can be better aligned with the explosion-proof valve, so that the high-temperature and high-pressure gas can be discharged smoothly after the explosion-proof valve is opened, thereby reducing the risk of fire and explosion of the battery cells.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 It is a schematic diagram of the structure of the shell body and the protective film of the battery cell according to the utility model.

[0021] Figure 2 It is a schematic structural diagram of the matching of the shell and the pole of the battery cell according to the utility model.

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

[0023] Figure 4 It is a structural schematic diagram of a battery cell according to the utility model without a supporting block.

[0024] Reference numerals:

[0025] Battery cell 100,

[0026] Shell 1 , shell body 11 , positioning mark 111 , cover plate 12 , explosion-proof valve 2 , protective film 3 , avoidance hole 31 , through hole 32 , support block 4 , pole 5 . DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0029] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] Reference below Figure 1-Figure 4 A battery cell 100 according to an embodiment of the present invention is described.

[0031] like Figure 1-Figure 4 As shown, the battery cell 100 according to the embodiment of the utility model includes a pole group, a shell 11, an explosion-proof valve 2 and a protective film 3. The pole group is installed in the shell 11, and the pole group can store or release electrical energy. The shell 11 is provided with an explosion-proof hole, and the explosion-proof valve 2 is installed on the explosion-proof hole. When the pole group has thermal runaway, the high-temperature and high-pressure gas can break through the explosion-proof valve 2 and be discharged, thereby reducing the risk of fire and explosion of the battery cell 100.

[0032] Furthermore, the protective film 3 is an insulating film, and the protective film 3 is wrapped on the outer surface of the shell 11, which can prevent the shell 11 from short-circuiting with the external metal structure. For example, multiple battery cells 100 are constructed into an electrode assembly. By wrapping the protective film 3 on the outer surface of the shell 11, it is possible to prevent two adjacent metal shells 11 from directly contacting each other and causing a short circuit. In addition, the electrode assembly is installed in a protective shell to form a battery, and the protective film 3 can also separate the metal shell 11 and the metal protective shell, thereby preventing the shell 11 and the protective shell from directly contacting each other and causing a short circuit.

[0033] However, it can be understood that in the present application, the protective film 3 is attached to the outer surface of the shell 11 by wrapping, and the protective film 3 is provided with an avoidance hole 31 opposite to the explosion-proof valve 2; through the avoidance hole 31, the protective film 3 can be prevented from affecting the discharge of high-temperature and high-pressure gas after the explosion-proof valve 2 is opened. However, if the protective film 3 is pasted crookedly so that the avoidance hole 31 cannot be opposite to the explosion-proof valve 2, that is, when only part of the avoidance hole 31 is opposite to part of the explosion-proof valve 2, and the other part of the explosion-proof valve 2 is opposite to the protective film 3, when the high-temperature and high-pressure gas is discharged through the explosion-proof valve 2, it will impact the protective film 3 and be blocked by the protective film 3, thereby affecting the discharge of the high-temperature and high-pressure gas.

[0034] Based on this, in the present application, a first positioning structure is provided on the shell 11, and a second positioning structure opposite to the first positioning structure is provided on the protective film 3. In this way, when the protective film 3 is pasted, the protective film 3 can be better pasted through the positioning cooperation between the first positioning structure and the second positioning structure, and the avoidance hole 31 of the protective film 3 after pasting can be better aligned with the explosion-proof valve 2, so that the high-temperature and high-pressure gas can be discharged smoothly after the explosion-proof valve 2 is opened, thereby reducing the risk of fire and explosion of the battery cell 100.

[0035] According to the battery cell 100 of the embodiment of the utility model, a first positioning structure is provided on the shell 11, and a second positioning structure opposite to the first positioning structure is provided on the protective film 3. When the protective film 3 is pasted, the protective film 3 can be better pasted through the positioning cooperation between the first positioning structure and the second positioning structure, and the avoidance hole 31 of the protective film 3 after pasting can be better aligned with the explosion-proof valve 2, so that the high-temperature and high-pressure gas can be discharged smoothly after the explosion-proof valve 2 is opened, thereby reducing the risk of fire and explosion of the battery cell 100.

[0036] In some embodiments of the present invention, Figure 1-Figure 4 As shown, the first positioning structure is a positioning mark 111 arranged on the outer surface of the housing 11 , and the second positioning structure is a through hole 32 opposite to the positioning mark 111 , and the shape of the through hole 32 is the same as that of the positioning mark 111 .

[0037] In one example, the positioning mark 111 is a pattern etched on the outer surface of the shell 11. Therefore, when the protective film 3 is pasted, the positioning of the protective film 3 can be completed by aligning the through hole 32 with the pattern, which can better make the avoidance hole 31 of the protective film 3 after pasting face the explosion-proof valve 2. In addition, the pattern is constructed on the outer surface of the shell 11 by etching, which is simple and convenient to operate. In addition, the pattern is constructed on the outer surface of the shell 11 by etching, which can be easily recognized by automated equipment, thereby realizing the automatic pasting of the protective film 3 on the outer surface of the shell 11.

[0038] For example, Figure 1-Figure 4 As shown, the through hole 32 is circular in shape, and the positioning mark 111 is also circular in shape, which has a simple shape, is easy to manufacture, and is also easy to identify and locate.

[0039] It is understandable that the shape of the through hole 32 and the shape of the positioning mark 111 can also be square, diamond, etc., and the present application does not limit this.

[0040] In some embodiments of the present invention, Figure 1-Figure 4As shown, a plurality of positioning marks 111 are provided, and a plurality of through holes 32 are provided, and the plurality of positioning marks 111 correspond one-to-one to the plurality of through holes 32. Thus, through the one-to-one corresponding positioning of the plurality of positioning marks 111 and the plurality of through holes 32, the positioning accuracy of the protective film 3 can be improved, thereby enabling the avoidance hole 31 of the protective film 3 after pasting to be better aligned with the explosion-proof valve 2.

[0041] In some embodiments of the present invention, the distance L1 between the outer periphery of the positioning mark 111 and the inner periphery of the through hole 32 satisfies: 0mm≤L1≤1.5mm, and / or the distance L2 between the explosion-proof valve 2 and the avoidance hole 31 satisfies: 0.2mm<L2<4mm.

[0042] Exemplarily, the size of the through hole 32 is larger than the size of the positioning mark 111. After the protective film 3 is pasted, the positioning mark 111 corresponds to the inside of the through hole 32. By making the distance L1 between the outer periphery of the positioning mark 111 and the inner periphery of the through hole 32 meet the above conditions, the fault tolerance rate when pasting the protective film 3 can be improved and the difficulty of pasting the protective film 3 can be reduced.

[0043] Exemplarily, the size of the avoidance hole 31 is larger than that of the explosion-proof valve 2. After the protective film 3 is pasted, the explosion-proof valve 2 corresponds to the avoidance hole 31. By making the distance L2 between the explosion-proof valve 2 and the avoidance hole 31 meet the above conditions, the fault tolerance rate when pasting the protective film 3 can be improved and the difficulty of pasting the protective film 3 can be reduced.

[0044] In some embodiments of the present invention, Figure 1-Figure 4 As shown, the positioning mark 111 and the explosion-proof valve 2 are located on the same wall panel of the shell 11, thereby, when the positioning mark 111 corresponds to the through hole 32, it can be checked whether the avoidance hole 31 and the explosion-proof valve 2 correspond, that is, when the positioning mark 111 and the through hole 32 are positioned and matched, the avoidance hole 31 and the explosion-proof valve 2 can also be used as a positioning reference, thereby further reducing the difficulty of pasting the protective film 3.

[0045] In some embodiments of the present invention, a plurality of positioning marks 111 are provided on the wall plate, and the plurality of positioning marks 111 are respectively provided on both sides of the explosion-proof valve 2. Figure 1-Figure 4 As shown, three positioning marks 111 are respectively arranged on both sides of the explosion-proof valve 2, and the protective film 3 has through holes 32 corresponding to the positioning marks 111, so that not only can the avoidance hole 31 and the explosion-proof valve 2 be better positioned by positioning between the positioning marks 111 and the through holes 32 to ensure that they are directly opposite, but also the avoidance hole 31 and the explosion-proof valve 2 can be better used as a positioning reference, thereby further reducing the difficulty of pasting the protective film 3.

[0046] In some embodiments of the present invention, Figure 1-Figure 4As shown, the battery cell 100 also includes a support block 4, which is made of structural adhesive. The support block 4 is bonded to the shell 11 through the through hole 32, and the support block 4 is used to separate the shell 11 from the protective shell of the battery to construct an exhaust space between the explosion-proof valve 2 and the protective shell.

[0047] like Figure 1-Figure 4 As shown, the explosion-proof valve 2 is located at the bottom of the battery cell 100, and the support block 4 is supported on the lower end of the battery cell 100, thereby, an exhaust space can be constructed below the battery cell 100 through the support block 4, and the high-temperature and high-pressure gas discharged from the explosion-proof valve 2 can enter the exhaust space well and then be discharged, and the support block 4 can be adhered to the shell 11 through the through hole 32, which can improve the connection strength between the support block 4 and the shell 11, reduce the influence of the protective film 3 on the support block 4, so that the support block 4 can stably construct the exhaust space below the battery cell 100.

[0048] In some embodiments of the present invention, Figure 1-Figure 4 As shown, the shell 11 includes a shell body 11 and a cover plate 12 . Both ends of the shell body 11 have openings, and the cover plate 12 is installed at the openings. The explosion-proof hole is located on the shell body 11 , and the cover plate 12 is installed with a pole 5 .

[0049] like Figure 1-Figure 4 As shown, the shell 11 is a rectangular shell 11, both ends of the shell 11 are provided with openings, the cover plate 12 is covered at the openings, the pole 5 is installed on the cover plate 12, the shell 11 includes a first wall plate and a second wall plate arranged opposite to each other, the area of ​​the first wall plate is larger than the area of ​​the second wall plate, the explosion-proof valve 2 is installed on the second wall plate, and by installing the explosion-proof valve 2 on the second wall plate and installing the pole 5 on the cover plate 12, the interference between the explosion-proof valve 2 and the pole 5 can be reduced, and the difficulty of insulating the explosion-proof valve 2 and the pole 5 can be reduced, thereby reducing the cost.

[0050] The present invention also provides a battery having the battery cell 100 of the above embodiment.

[0051] According to the embodiment of the utility model, the battery includes a protective shell and an electrode assembly installed in the protective shell, the electrode assembly includes a plurality of battery cells 100, and a first positioning structure is provided on the shell 11, and a second positioning structure opposite to the first positioning structure is provided on the protective film 3. When the protective film 3 is pasted, the protective film 3 can be better pasted through the mutual positioning cooperation between the first positioning structure and the second positioning structure, and the avoidance hole 31 of the pasted protective film 3 can be better aligned with the explosion-proof valve 2, so that the high-temperature and high-pressure gas can be discharged smoothly after the explosion-proof valve 2 is opened, thereby reducing the risk of fire and explosion of the battery cell 100.

[0052] The battery cell 100 and other structures and operations of the battery according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0053] In the description of this specification, the description with reference to the terms "some embodiments", "optionally", "further" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: Pole group; A shell, the pole group is installed in the shell, and the shell is provided with explosion-proof holes; An explosion-proof valve, the explosion-proof valve being installed on the explosion-proof hole; A protective film is wrapped around the outer surface of the shell, and the protective film is provided with an avoidance hole opposite to the explosion-proof valve; wherein a first positioning structure is provided on the shell, and a second positioning structure opposite to the first positioning structure is provided on the protective film.

2. The battery cell according to claim 1, characterized in that: The first positioning structure is a positioning mark arranged on the outer surface of the shell, and the second positioning structure is a through hole opposite to the positioning mark, and the shape of the through hole is the same as that of the positioning mark.

3. The battery cell according to claim 2, characterized in that: The positioning mark is a pattern etched on the outer surface of the shell.

4. The battery cell according to claim 2, characterized in that: There are a plurality of positioning marks, and a plurality of through holes, and the plurality of positioning marks correspond to the plurality of through holes one by one.

5. The battery cell according to claim 2, characterized in that: The distance L1 between the outer periphery of the positioning mark and the inner periphery of the through hole satisfies: 0mm≤L1≤1.5mm; and / or the distance L2 between the explosion-proof valve and the avoidance hole satisfies: 0.2mm<L2<4mm.

6. The battery cell according to claim 2, characterized in that: The positioning mark and the explosion-proof valve are located on the same wall plate of the shell.

7. The battery cell according to claim 6, characterized in that: A plurality of positioning marks are arranged on the wall plate, and the plurality of positioning marks are arranged on both sides of the explosion-proof valve respectively.

8. The battery cell according to claim 6 or 7, characterized in that: It also includes a support block, which is made of structural adhesive and is bonded to the shell through the through hole. The support block is used to separate the shell from the protective shell of the battery to construct an exhaust space between the explosion-proof valve and the protective shell.

9. The battery cell according to claim 1, characterized in that: The shell comprises a shell body and a cover plate, the two ends of the shell body are provided with openings, the cover plate is installed at the openings, the explosion-proof hole is located on the shell body, and a pole is installed on the cover plate.

10. A battery, characterized in that: include: A protective shell and an electrode assembly installed in the protective shell, wherein the electrode assembly includes a plurality of battery cells, and the battery cells are the battery cells according to any one of claims 1 to 9.

Images