Shell structure, battery and electric device

Abstract

The utility model discloses a shell structure, a battery and an electric device, and the shell structure is used for the battery and comprises a shell and a protective film. An opening is formed in at least one end of the shell in the length direction, the protective film is attached to the inner surface of the shell, a positioning piece is connected to the protective film, the positioning piece is located in the shell and is close to the opening, and the positioning piece is suitable for providing support for the tab. According to the shell structure, the production cost of the battery can be reduced and the unit volume capacity of the battery can be improved while the stability of the tabs is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a shell structure, a battery and an electrical device. Background Art

[0002] Batteries are widely used in various types of electrical equipment, and the battery cells are placed in the shell. During long-term use of the battery, the battery is susceptible to collision. When the battery collides, the battery cells, tabs and other structures in the shell are prone to shaking. In order to ensure the structural stability of the tabs, it is necessary to set an additional fixed structure for the tabs. The fixed structure is independently set in the battery relative to the original battery structure such as the battery cells, shell and protective film, which increases the number of battery components, increases the material cost and assembly cost in the battery production and assembly process, and reduces the assembly efficiency of the battery. In addition, the fixed structure will also occupy the space inside the battery, resulting in a decrease in the battery's unit volume capacity. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a shell structure, which can reduce the production cost of the battery and increase the unit volume capacity of the battery while ensuring the stability of the tab.

[0004] The utility model also provides a battery comprising the above-mentioned shell structure.

[0005] The utility model also provides an electrical device comprising the battery.

[0006] The shell structure according to the embodiment of the utility model is used for a battery and includes: a shell, wherein the shell is provided with an opening at at least one end in the length direction; a protective film, wherein the protective film is attached to the inner surface of the shell, and a positioning piece is connected to the protective film, wherein the positioning piece is located in the shell and is arranged close to the opening, and wherein the positioning piece is suitable for providing support for the pole ear.

[0007] According to the shell structure of the embodiment of the utility model, by connecting the positioning member to the protective film, the positioning member can provide support for the pole ear, which can improve the structural stability of the pole ear and improve the stability of the position of the pole ear, and can also reduce or avoid the movement of the pole ear relative to the shell, that is, reduce or avoid the contact between the pole ear and the shell to cause leakage. In addition, the positioning member is directly connected to the protective film, which can reduce the space occupied by the positioning member in the shell, thereby increasing the battery capacity per unit volume. And in the assembly of the battery, when the protective film is assembled into the battery, the positioning member can be assembled in the battery at the same time as the protective film, so that when the battery is assembled, there is no need to set an additional assembly process for the positioning member, which can simplify the assembly process of the battery.

[0008] In some embodiments, the positioning member includes: a connecting plate, the connecting plate is connected to the protective film; and a positioning plate, one end of the positioning plate is connected to the connecting plate and the other end extends into the shell.

[0009] Furthermore, the connecting plate and the positioning plate are integrally formed.

[0010] In some embodiments, the positioning member is connected to the protective film by heat melting.

[0011] Furthermore, the positioning member and the protective film are made of the same material.

[0012] In some embodiments, the shell structure further includes: an end cover assembly, the end cover assembly is covered on the opening; the end cover assembly includes: a seal, the protective film is clamped between the seal and the shell at the opening along the circumference of the opening.

[0013] Furthermore, the protective film is connected to the sealing member by thermal melting.

[0014] According to the battery of the embodiment of the utility model, it includes: a shell structure, which is the shell structure described in the above embodiment; a battery cell, which is arranged in the shell, and the battery cell has a battery cell end face and a battery cell side face, the battery cell end face faces the opening, and the battery cell is provided with the electrode ear on the battery cell end face; wherein the protective film is coated on the battery cell side face, and the protective film extends to the opening in the length direction of the shell.

[0015] According to the battery of the embodiment of the utility model, by adopting the shell structure of the above-mentioned embodiment, the stability of the pole ear is improved, and the battery assembly is simplified. At the same time, the protective film can play an insulating effect at various places on the inner surface of the shell, so that the protective film can separate the shell from the charged structures such as the battery cell or the pole ear inside the shell, reduce or avoid the charged structures such as the battery cell or the pole ear contacting the shell, thereby reducing or avoiding leakage in the shell.

[0016] In some embodiments, the shell structure includes an end cover assembly, the battery cell end face, the end cover assembly and the protective film enclose a accommodating cavity, and the pole ear is located in the accommodating cavity; the positioning member is arranged on the side of the protective film facing the accommodating cavity, and the positioning member extends into the accommodating cavity to support the pole ear.

[0017] Furthermore, the accommodating cavity includes a first accommodating space and a second accommodating space; in the length direction, a first accommodating space is formed between the positioning member and the end face of the battery cell, and a second accommodating space is formed between the positioning member and the end cover assembly, and the first accommodating space is connected to the second accommodating space.

[0018] In some embodiments, the end cap assembly includes: an electrical connector, the electrical connector is electrically connected to the tab, and the electrical connector is spaced apart from the shell.

[0019] The electric device according to the embodiment of the utility model comprises the battery described in any one of the above embodiments.

[0020] According to the electric device of the embodiment of the utility model, by adopting the battery of the above embodiment, the risk of electric leakage is reduced, the battery has a higher unit volume capacity, and the assembly process of the battery is simplified, thereby improving the safety of the electric device and reducing the assembly cost.

[0021] 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

[0022] 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:

[0023] Figure 1 is a partial exploded view of a battery according to an embodiment of the utility model;

[0024] Figure 2 is a partial cross-sectional structural diagram of a battery according to an embodiment of the utility model;

[0025] Figure 3 yes Figure 2 An enlarged schematic diagram of the structure at the positioning member shown in FIG.

[0026] Figure 4 is a partial cross-sectional structural diagram of a battery according to another embodiment of the utility model;

[0027] Figure 5 It is a schematic diagram of the structure of the protective film according to the embodiment of the utility model when it is not covered on the side of the battery cell;

[0028] Figure 6 It is a three-dimensional structural diagram of a battery according to an embodiment of the utility model.

[0029] Reference numerals:

[0030] Battery 100,

[0031] The accommodating chamber 10, the first accommodating space 101, the second accommodating space 102,

[0032] Shell 11, opening 110,

[0033] Battery cell 12, battery cell end face 121, battery cell side face 122, pole ear 123,

[0034] End cap assembly 13, sealing member 131, electrical connector 132,

[0035] Protective film 14,

[0036] Positioning member 15 , connecting plate 151 , positioning plate 152 . DETAILED DESCRIPTION

[0037] 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.

[0038] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0039] In the description of the present invention, 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The housing structure, the battery 100 and the electrical device according to the embodiments of the present invention are described below with reference to the accompanying drawings.

[0041] like Figure 1 , Figure 2 The shell structure according to the embodiment of the utility model is used for a battery 100 and includes: a shell 11 and a protective film 14 .

[0042] The shell 11 is provided with an opening 110 at at least one end in the length direction, the protective film 14 is attached to the inner surface of the shell 11 , and the protective film 14 is connected with a positioning member 15 , which is located in the shell 11 and arranged close to the opening 110 , and is suitable for providing support for the pole ear 123 .

[0043] It is understandable that the tab 123 is made of a conductive metal material, so that the tab 123 is ductile. In the preparation of the battery 100, the tab 123 of the battery cell 12 can be configured into a certain shape, but under the long-term use of the battery 100, heat is easily accumulated on the tab 123, resulting in the risk of heat deformation of the tab 123 during long-term use. In addition, when the battery 100 is hit, the tab 123 shakes relative to the battery cell 12, which easily causes the tab 123 to tear.

[0044] In the existing battery 100, in order to ensure the structural stability of the pole ear 123, it is necessary to additionally set a fixing structure for the pole ear 123, and the fixing structure is independently set in the battery 100 relative to the battery cell 12, the housing 11 and the protective film 14, etc., resulting in an increase in the number of components of the battery 100, an increase in the number of steps in the production and assembly process of the battery 100, and a reduction in the assembly efficiency of the battery 100. In addition, the fixing structure will also occupy the space inside the battery 100, resulting in a reduction in the unit volume capacity of the battery 100.

[0045] The shell structure of the present application connects a positioning member 15 to the protective film 14, so that the positioning member 15 can provide support for the pole lug 123, thereby improving the structural stability of the pole lug 123 and the stability of the setting position of the pole lug 123, and can also reduce or avoid the movement of the pole lug 123 relative to the shell 11. The positioning member 15 and the shell 11 are located on both sides of the protective film 14, thereby reducing or avoiding the displacement of the pole lug 123, causing contact with the shell 11 and causing leakage.

[0046] In addition, the positioning member 15 is directly connected to the protective film 14, which can reduce the space occupied by the positioning member 15 in the housing 11, thereby increasing the capacity of the battery 100 per unit volume. In the assembly of the battery 100, when the protective film 14 is assembled into the battery 100, the positioning member 15 can be assembled into the battery 100 simultaneously with the protective film 14, so that when the battery 100 is assembled, there is no need to set an additional assembly process for the positioning member 15, which can simplify the assembly process of the battery 100.

[0047] In the present application, the connection position of the positioning member 15 on the protective film 14 is pre-set according to the position of the tab 123 in the housing 11. That is, before the protective film 14 is assembled into the housing 11, the positioning member 15 can be pre-connected to the protective film 14.

[0048] In some embodiments, Figure 2-Figure 5As shown, the positioning member 15 includes: a connecting plate 151 and a positioning plate 152. The connecting plate 151 is connected to the protective film 14, and one end of the positioning plate 152 is connected to the connecting plate 151, and the other end extends into the housing 11.

[0049] Therefore, the positioning member 15 can have a larger contact area with the protective film 14 through the connecting plate 151, thereby ensuring a stable connection of the positioning member 15 on the protective film 14, and the positioning plate 152 can extend to the corresponding position in the shell 11 according to the shape of the pole ear 123, ensuring the supporting effect of the positioning member 15 on the pole ear.

[0050] In the battery 100 of the present application, the shape of the positioning plate 152 is not limited. Figure 2 , Figure 4 In the example, the positioning plate 152 is set as a flat plate, and the positioning plate 152 and the connecting plate 151 are set perpendicularly, and the positioning member 15 forms an "L" shape. For another example, the positioning plate 152 is set as a flat plate, and the positioning plate 152 and the connecting plate 151 are not set perpendicularly. Even more, the positioning plate 152 can be set as an arc plate, so that the positioning plate 152 and the connecting plate 151 cooperate to form a "P" shape, a "D" shape, or a "b" shape.

[0051] Specifically, the connecting plate 151 and the positioning plate 152 are integrally formed, thereby ensuring the structural strength of the positioning member 15 and reducing the production cost of the positioning member 15.

[0052] In some embodiments, the positioning member 15 is connected to the protective film 14 by thermal melting.

[0053] It can be understood that both the positioning member 15 and the protective film 14 are made of insulating materials, and the insulating materials are usually polymer materials.

[0054] Therefore, the connection stability between the positioning member 15 and the protective film 14 can be ensured by the hot melt connection.

[0055] In the present application, the materials of the positioning member 15 and the protective film 14 are not limited. The positioning member 15 and the protective film 14 are made of materials with similar melting points to improve the stability of the hot-melt connection between the positioning member 15 and the protective film 14 .

[0056] Preferably, the positioning member 15 and the protective film 14 are made of the same material, which can improve the stability of the hot-melt connection between the positioning member 15 and the protective film 14. At the same time, the types of materials required can be reduced, thereby reducing the material cost of manufacturing the battery 100.

[0057] In some embodiments, Figure 2 , Figure 4As shown, the housing structure further includes an end cover assembly 13, which is disposed on the opening 110. The end cover assembly 13 includes a sealing member 131, and a protective film 14 is sandwiched between the sealing member 131 and the housing 11 at the opening 110 along the circumference of the opening 110.

[0058] It is understandable that the seal 131 can cooperate with the protective film 14 to achieve insulation at various locations inside the shell 11. The seal 131 is made of insulating material, which can play an insulating role between the end cover assembly 13 and the shell 11, thereby avoiding leakage between the end cover assembly 13 and the shell 11.

[0059] Thus, the seal 131 cooperates with the protective film 14 to ensure the sealed insulation inside the housing 11 , thereby reducing the risk of leakage from the pole tab 123 to the housing 11 , and from the pole tab 123 to the end cap assembly 13 .

[0060] It should be noted that, in the present application, there is no limitation on the number of end cover assemblies 13. Figure 6 In the example, a battery cell 12 is arranged in the shell 11, and a protective film 14 is coated on the side of the battery cell 12. The shell structure includes two end cap assemblies 13. Correspondingly, an opening 110 is formed at each end of the shell 11 in the length direction. The two end cap assemblies 13 are respectively covered on one opening 110, and the battery cell 12 has two battery cell end faces 121 in the length direction. The two battery cell end faces 121 correspond to the two end cap assemblies 13 one by one. Each battery cell end face 121 is provided with a pole ear 123, and each pole ear 123 is connected to the corresponding battery cell end face 121 and the end cap assembly 13 at the same time. The protective film 14 extends to the two openings 110 at the same time along the length direction of the battery cell 12, and the protective film 14 is sandwiched between the corresponding seal 131 and the shell 11 along the circumference of the opening 110 at each opening 110.

[0061] Furthermore, the protective film 14 is connected to the sealing member 131 by heat melting. Thus, the gap between the protective film 14 and the sealing member 131 can be reduced or avoided, thereby improving the sealing of the accommodating cavity 10 and reducing or avoiding the risk of leakage from the tab 123 to the housing 11.

[0062] Preferably, the protective film 14 and the sealing member 131 are made of materials with similar melting points, so that the hot-melt connection between the protective film 14 and the sealing member 131 can be more secure.

[0063] As Figure 1 , Figure 2 As shown, the battery 100 according to the embodiment of the present invention includes: a shell structure and a battery cell 12.

[0064] The shell structure is the shell structure provided by any of the above embodiments, the battery cell 12 is arranged in the shell 11, the battery cell 12 has a battery cell end face 121 and a battery cell side face 122, the battery cell end face 121 faces the opening 110, and the battery cell 12 is provided with a pole ear 123 on the battery cell end face 121. Among them, the protective film 14 is coated on the battery cell side face 122, and the protective film 14 extends to the opening 110 in the length direction of the shell 11.

[0065] It can be understood that the protective film 14 extends to the opening 110 in the length direction, that is, the protective film 14 is attached to various locations on the inner surface of the housing 11 .

[0066] Therefore, the protective film 14 can play an insulating effect at all locations on the inner surface of the shell 11, ensuring that the protective film 14 can separate the shell 11 from the charged structures such as the battery cell 12 or the pole tab 123 inside the shell, reducing or avoiding the charged structures such as the battery cell 12 or the pole tab 123 contacting the shell, thereby reducing or avoiding leakage in the shell 11.

[0067] In some embodiments, Figure 1 , Figure 2 As shown, the housing structure includes an end cap assembly 13, a cell end face 121, an end cap assembly 13 and a protective film 14 enclose a receiving cavity 10, and a pole ear 123 is located in the receiving cavity 10. A positioning member 15 is provided on the side of the protective film 14 facing the receiving cavity 10, and the positioning member 15 extends into the receiving cavity 10 to support the pole ear 123.

[0068] Thus, by providing the accommodating cavity 10, a space for accommodating the tab 123 can be provided in the housing 11, thereby preventing the tab 123 from being excessively bent and broken due to pressure in an overly small space. By controlling the length of the accommodating cavity 10 in the longitudinal direction, the length of the tab 123 can be controlled within a suitable range, thereby reducing or avoiding the risk of tearing caused by uneven force on the tab 123.

[0069] In the present application, the position where the positioning member 15 extends to the accommodating cavity 10 is not limited, and the position where the positioning member 15 extends to the accommodating cavity 10 needs to be set according to the shape of the tab 123. Figure 2 and Figure 4 In the example, the shape of the pole ear 123 is different, that is, the setting position of the positioning member 15 and the position extending into the accommodating cavity 10 are different.

[0070] Furthermore, the accommodating chamber 10 includes a first accommodating space 101 and a second accommodating space 102. In the length direction of the battery 100, the first accommodating space 101 is formed between the positioning member 15 and the cell end face 121, and the second accommodating space 102 is formed between the positioning member 15 and the end cover assembly 13, and the first accommodating space 101 and the second accommodating space 102 are connected.

[0071] It can be understood that, in the length direction of the battery 100, the two sides of the positioning member 15 are provided to form a first accommodating space 101 and a second accommodating space 102, so that the positioning member 15 can accommodate the pole ear 123 on both sides, so that there is enough space at the end face 121 of the battery cell to lead out the pole ear 123, and there is also enough space at the end cover assembly 13 to ensure the reliable connection between the pole ear 123 and the end cover assembly 13.

[0072] Furthermore, the end cap assembly 13 includes an electrical connector 132 . The electrical connector 132 is electrically connected to the tab 123 , and the electrical connector 132 is spaced apart from the housing 11 .

[0073] It is understandable that the electrical connector 132 can be electrically connected to the side of the end cover assembly 13 outside the shell 11 to achieve electrical connection between the tab 123 at the end cover assembly 13 and the outside of the shell 11 .

[0074] Thus, the electrical connector 132 contacts the tab 123 , enabling electrical conduction from the battery cell 12 to the outside of the battery 100 , and the electrical connector 132 is spaced apart from the shell 11 to reduce or avoid leakage caused by the electrical connector 132 contacting the shell 11 .

[0075] In some specific embodiments, the battery 100 further includes: an adhesive layer (not shown in the figure), which is disposed between the battery cell side surface 122 and the protective film 14 .

[0076] It can be understood that in the layered stacked battery 100, the battery cell 12 is provided with a separator on two sides in the stacking direction, and the battery cell 12 is a layered structure on the side perpendicular to the stacking direction. In this side, the conductive structure of the battery cell 12 is exposed on the side of the battery 100, which is prone to leakage on the side of the battery 100.

[0077] Therefore, by providing an adhesive layer on the side surface 122 of the battery cell, it can cover the side surface of the battery cell 12 where the conductive structure is exposed, thereby forming an insulating layer on the side surface 122 of the battery cell. Then, through the cooperation of the adhesive layer and the protective film 14, double insulation of the battery cell 12 can be achieved, thereby reducing or avoiding the risk of leakage of the battery cell 12 on the side surface.

[0078] The electric device according to the embodiment of the present invention comprises the battery 100 according to any one of the above embodiments.

[0079] The electric device of the present application adopts the battery 100 of the above embodiment, and while reducing the risk of leakage, the battery 100 has a higher unit volume capacity, and the assembly process of the battery 100 is simplified, thereby improving the safety of the electric device and reducing the assembly cost.

[0080] In the present application, the type of the electrical device is not limited. For example, the electrical device may be an electrically powered vehicle.

[0081] The housing structure, the battery 100 and other components and operations of the electrical device according to the embodiment of the utility model are known to those skilled in the art and will not be described in detail here.

[0082] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" 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.

[0083] 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 shell structure, It is characterized in that For batteries, including: A shell (11), wherein at least one end of the shell (11) in the length direction is provided with an opening (110); A protective film (14), the protective film (14) being attached to the inner surface of the shell (11), a positioning member (15) being connected to the protective film (14), the positioning member (15) being located inside the shell (11) and arranged close to the opening (110), and the positioning member (15) being suitable for providing support for the pole lug (123).

2. The housing structure according to claim 1, It is characterized in that The positioning member (15) comprises: A connecting plate (151), wherein the connecting plate (151) is connected to the protective film (14); A positioning plate (152), one end of the positioning plate (152) is connected to the connecting plate (151), and the other end extends into the housing (11).

3. The housing structure according to claim 2, It is characterized in that The connecting plate (151) and the positioning plate (152) are integrally formed.

4. The housing structure according to claim 1, It is characterized in that The positioning piece (15) is connected to the protective film (14) by thermal melting.

5. The housing structure according to claim 4, It is characterized in that The positioning piece (15) and the protective film (14) are made of the same material.

6. The housing structure according to claim 1, It is characterized in that The housing structure further comprises: an end cover assembly (13), wherein the end cover assembly (13) is disposed to cover the opening (110); The end cover assembly (13) comprises: a sealing member (131); the protective film (14) is sandwiched between the sealing member (131) and the housing (11) at the opening (110) along the circumferential direction of the opening (110).

7. The housing structure according to claim 6, It is characterized in that The protective film (14) is connected to the sealing member (131) by thermal melting.

8. A battery, It is characterized in that include: A shell structure, wherein the shell structure is the shell structure according to any one of claims 1 to 7; A battery cell (12), the battery cell (12) being arranged in the housing (11), the battery cell (12) having a battery cell end face (121) and a battery cell side face (122), the battery cell end face (121) facing the opening (110), and the battery cell (12) being provided with the pole ear (123) on the battery cell end face (121); The protective film (14) is coated on the side surface (122) of the battery cell, and the protective film (14) extends to the opening (110) in the length direction of the shell (11).

9. The battery according to claim 8, It is characterized in that The housing structure comprises an end cover assembly (13), the cell end surface (121), the end cover assembly (13) and the protective film (14) enclose a receiving cavity (10), and the pole ear (123) is located in the receiving cavity (10); The positioning member (15) is arranged on a side of the protective film (14) facing the accommodating cavity (10), and the positioning member (15) extends into the accommodating cavity (10) to support the pole lug (123).

10. The battery according to claim 9, It is characterized in that The accommodating chamber (10) comprises a first accommodating space (101) and a second accommodating space (102); In the length direction, the first accommodating space (101) is formed between the positioning member (15) and the cell end surface (121), the second accommodating space (102) is formed between the positioning member (15) and the end cover assembly (13), and the first accommodating space (101) is connected to the second accommodating space (102).

11. The battery according to claim 9, It is characterized in that The end cover assembly (13) comprises an electrical connector (132), the electrical connector (132) being electrically connected to the pole lug (123), and the electrical connector (132) being spaced apart from the housing (11).

12. An electrical device, It is characterized in that Comprising the battery (100) according to any one of claims 8 to 11.

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