Battery monomer, battery pack and electric equipment

Abstract

The utility model provides a battery monomer, a battery pack and electric equipment, and relates to the technical field of batteries. According to the battery monomer provided by the invention, the outer surfaces of the conductive terminals are used for being electrically connected with the tabs, and the inner surfaces, used for forming the hollow cavities, of the conductive terminals are used for being matched with the electric connecting pieces to form insertion connection, so that the battery monomers are electrically connected, and the conductive terminals serving as switching structures effectively shorten the distance between the tabs and the electric connecting pieces; therefore, the over-current capability of the single battery can be improved by using a relatively large tab.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery pack and an electric device. BACKGROUND

[0002] The main structure design of the existing power battery is usually a winding type square aluminum shell structure, which has the characteristics of high production efficiency and high reliability. However, when high-rate charging is performed, the overcurrent capacity of the battery monomer is limited due to the material and structural characteristics of the internal mechanical parts of the battery monomer. When the overcurrent of the battery monomer is large, the internal temperature of the battery monomer rises, which affects the performance of the battery monomer. In particular, the temperature of the electrical connection parts in the common cell is higher than that of the winding core, and the heat cannot be quickly dissipated to the outside, which increases the heat of the winding core in the cell, affecting the dynamics and thermodynamics performance of the battery monomer. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application provides a battery monomer, a battery pack and an electric device, which aims to solve the above technical problems to some extent.

[0004] According to a first aspect of the present application, a battery monomer is provided, which comprises a shell, a cell, a conductive terminal and an electrical connection part.

[0005] The shell has a receiving cavity in the interior of the shell, and the cell comprises a cell body arranged in the interior of the receiving cavity and a tab connected to the cell body.

[0006] The conductive terminal has an outer surface and an inner surface, and a hollow cavity is defined in the interior of the conductive terminal by the inner surface. The outer surface is electrically connected to the tab, and the electrical connection part is inserted into the hollow cavity to be electrically connected to the inner surface.

[0007] The electrical connection part is used to electrically connect the battery monomer where the electrical connection part is located and the remaining battery monomers adjacent to the battery monomer.

[0008] On the basis of the above technical solution, the conductive terminal is located outside the receiving cavity, and at least a part of the tab connected to the conductive terminal is located outside the receiving cavity.

[0009] On the basis of any of the above technical solutions, the shell has an opening.

[0010] The battery monomer further comprises a first cover plate connected to the shell, and the first cover plate is arranged at the opening.

[0011] The conductive terminal is connected to a side of the first cover plate away from the battery body, and the part of the tab connected with the conductive terminal is located at the side of the first cover plate away from the battery body.

[0012] On the basis of any of the above technical solutions, optionally, the first cover plate and / or the shell is provided with a through portion, and the tab passes through the through portion and is connected to the conductive terminal.

[0013] On the basis of any of the above technical solutions, optionally, the number of the conductive terminals is a plurality, the first cover plate has a plurality of regions corresponding to the conductive terminals one by one, and the regions of different polarities are insulated from each other.

[0014] The polarity represents the polarity of the tab connected with the conductive terminal arranged on the region.

[0015] On the basis of any of the above technical solutions, optionally, the battery monomer further comprises a second cover plate, the second cover plate is located outside the conductive terminal, the second cover plate is connected with the first cover plate, and the second cover plate is sealed to the tab of the conductive terminal.

[0016] On the basis of any of the above technical solutions, optionally, the first cover plate extends outward away from the hollow cavity along the two end surfaces of the conductive terminal, and the extended edge of the first cover plate is connected with the shell to seal at least part of the tab in the shell.

[0017] On the basis of any of the above technical solutions, optionally, an inner thread is arranged on the inner surface, the electric connector has an outer thread, and the inner thread and the outer thread form a threaded connection to fix the conductive terminal and the electric connector.

[0018] According to the second aspect of the present application, a battery pack is provided, comprising a plurality of battery monomers as described above, and the electric connector is inserted into the conductive terminal of adjacent battery monomers to electrically connect the adjacent battery monomers.

[0019] According to the third aspect of the present application, a use electric device is provided, comprising a battery pack as described above.

[0020] According to the battery monomer provided in the present application, the outer surface of the conductive terminal is used to electrically connect with the tab, and the inner surface of the conductive terminal used to form the hollow cavity is used to form a plug-in connection with the electrical connector, so as to electrically connect each battery monomer, which makes the tab and the electrical connector separated by the inner surface and the outer surface of the conductive terminal, and realizes the electrical connection between the two, thereby shortening the distance between the tab and the electrical connector, allowing the battery monomer provided in the present application to use a larger tab relative to the related art, thereby facilitating to improve the overcurrent capacity of the battery monomer.

[0021] In addition, according to the battery monomer provided in the present application, the conductive terminal has a hollow cavity, so that the conductive terminal can provide a larger heat dissipation area, thereby facilitating to improve the heat dissipation performance of the battery monomer.

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 A schematic diagram of a tab of an electric core of a battery monomer provided according to an embodiment of the present application is shown.

[0024] Fig. 2 A schematic diagram of a battery monomer provided according to an embodiment of the present application is shown.

[0025] Fig. 3 Another schematic diagram of a battery monomer provided according to an embodiment of the present application is shown.

[0026] REFERENCE NUMERALS:

[0027] 20 - electric core; 30 - conductive terminal; 31 - hollow cavity; 32 - lug plate; 40 - tab; 50 - first cover plate; 60 - shell. DETAILED DESCRIPTION

[0028] The technical solutions of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0029] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; 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. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection required by the present application.

[0032] According to a first aspect of the present application, a battery cell is provided, which will be described below Figs. 1-3 The structure and working principle of the battery cell are specifically described.

[0033] According to a first aspect of the present application, a battery cell is provided, which includes a shell 60, an electric core 20, a conductive terminal 30 and an electrical connector.

[0034] In an embodiment, the shell 60 has a receiving cavity inside the shell 60, and the electric core 20 includes an electric core body arranged inside the receiving cavity and a tab 40 connected to the electric core body.

[0035] In an embodiment, the conductive terminal 30 has an outer surface and an inner surface, and a hollow cavity 31 is defined inside the conductive terminal 30 by the inner surface, i.e. the conductive terminal 30 has a hollow cavity 31.

[0036] In an embodiment, the electrical connector is inserted into the hollow cavity 31 to electrically connect with the inner surface of the aforementioned conductive terminal 30. In an embodiment, the electrical connector is used to electrically connect the battery cell where the electrical connector is located and the remaining battery cells adjacent to the battery cell.

[0037] Thus, according to the battery cell provided in the embodiments of the present application, the outer surface of the conductive terminal 30 is used to electrically connect with the tab 40, and the inner surface of the conductive terminal 30 forming the hollow cavity 31 is used to form a plug-in connection with the electrical connector, thereby electrically connecting the battery cells. This makes the inner surface of the hollow cavity 31 and the outer surface of the conductive terminal 30 correspondingly connected to the electrical connector and the tab 40, respectively. In this way, compared with the battery cell in the related art, the conductive terminal 30 as a switching structure effectively shortens the distance between the tab 40 and the electrical connector, and thus a larger tab 40 can be used to improve the overcurrent capacity of the battery cell.

[0038] In addition, according to the battery cell provided in the embodiments of the present application, the conductive terminal 30 has the hollow cavity 31, and thus the tab 40 is fully unfolded and covers the outer surface of the conductive terminal 30, thereby increasing the heat dissipation area and facilitating the improvement of the heat dissipation performance of the battery cell.

[0039] In combination with the above description, in the related art, the switching structure is usually provided in a sheet form and extends between the pole and the tab 40. The sheet form is bent to realize the point connection of the tab 40 to the pole. Therefore, the switching structure requires the space between the tab 40 and the pole as the space required for its extension. However, according to the conductive terminal 30 provided in the embodiments of the present application, the inner surface for forming the hollow cavity 31 is connected to the electrical connector, and the outer surface of the conductive terminal 30 is connected to the tab 40. The distance between the tab 40 and the electrical connector is the wall thickness of the wall part of the conductive terminal 30 forming the hollow cavity 31. This effectively reduces the space occupied by the tab 40 and the electrical connector, thereby allowing the tab 40 to realize the electrical connection with the electrical connector at a shorter distance.

[0040] Since the distance between the tab 40 and the conductive terminal 30 is shortened, the tab 40 is prevented from being torn due to the redundancy and bending of the tab 40. In addition, the tab 40 is electrically connected along the outer surface of the conductive terminal 30, which can limit and fix the tab 40, thereby preventing the tab 40 from being broken or inserted upside down during the operation and transportation of the battery cell. In addition, as mentioned above, since the distance between the tab 40 and the conductive terminal 30 is shortened, the battery cell provided in the embodiments of the present application can use a larger tab 40, thereby improving the overcurrent capacity of the battery cell.

[0041] In the embodiments, the inner surface of the conductive terminal 30 defining the hollow cavity 31 is understood to include the following meaning: the conductive terminal 30 has an inner surface located at the inner side of the outer surface of the outer side part, and the inner surface is formed as the inner surface of the hollow cavity 31 of the conductive terminal 30.

[0042] In the embodiments, the cell 20 can be formed as a wound core, for example, and the casing 60 can be a cuboid casing 60, for example, the casing 60 can be an aluminum casing, so the battery cell can be formed as a substantially square battery.

[0043] In an embodiment, as an example, the conductive terminal 30 may be, for example, a columnar structure, and the hollow cavity 31 may be formed on the columnar structure, having at least one opening communicating with the outside (e.g., one opening, or two openings opposite each other, or even more openings), into which the power supply connector is inserted. In an embodiment, as an example, the hollow cavity 31 may also be, for example, a columnar cavity, and accordingly, the portion of the electrical connector for insertion into the hollow cavity 31 has the same shape as the columnar cavity, so as to adapt to the shape of the hollow cavity 31 when inserted.

[0044] As an example, the conductive terminal 30 may include, for example, a cylindrical body, and the hollow cavity 31 may extend, for example, along the axis of the body. As an example, the hollow cavity 31 may be, for example, a cylindrical cavity, meaning the hollow cavity 31 may be a cavity defined by an inner cylindrical surface and extending along the aforementioned axis. In an embodiment, as an example, the hollow cavity 31 may not penetrate the aforementioned body, such that the hollow cavity 31 has an opening; or, in another example, the hollow cavity 31 may be a through-cavity penetrating the aforementioned body, thereby forming a hollow cavity 31 with two openings opposite each other in the axial direction. In the latter example, it is advantageous to increase the area of ​​the hollow cavity 31 exposed to the outside, thereby further increasing the heat dissipation performance of the conductive terminal 30.

[0045] In this embodiment, the conductive terminal 30 may be made of a metallic material such as aluminum, copper, or a copper-aluminum composite. In other words, the main body of the conductive terminal 30 may be a cylindrical structure made of a metallic material such as aluminum, copper, or a copper-aluminum composite.

[0046] In embodiments, the electrical connector corresponding to the conductive terminal 30 can be, for example, a cylindrical structure for insertion into the hollow cavity 31, or a cylindrical structure having a similar insertion method into the hollow cavity 31. As an example, the cylindrical structure can match the cylindrical shape of the hollow cavity 31. As an example, the electrical connector can also be made of a metallic material such as aluminum or copper; although not shown in the figures, the electrical connector can be a cylindrical rod-like structure, thereby allowing both ends of the electrical connector to be inserted into the hollow cavity 31 of the conductive terminal 30 belonging to different battery cells.

[0047] In other words, in the example above, the electrical connector can be inserted into the conductive terminals 30 of different battery cells, thereby forming an electrical connection between the different battery cells. That is to say, the electrical connector not only acts as a terminal in the battery cell in which it is located, but also acts as a busbar structure relative to the battery pack in which the battery cell is located.

[0048] According to the battery cell provided in the embodiments of this application, it can be understood that when the electrical connector is inserted into the conductive terminals 30 of the same polarity of different battery cells (e.g., conductive terminals 30 that are both positive or both negative), the electrical connector can function as a parallel connection between the two battery cells; when the electrical connector is inserted into the conductive terminals 30 of different polarities of different battery cells (e.g., two conductive terminals 30 that are positive and negative respectively), the electrical connector can function as a series connection between the two battery cells.

[0049] In the embodiments, since the electrical connector is inserted into the conductive terminals 30 of different battery cells, the shape of the electrical connector is not limited to a simple columnar structure.

[0050] It should be reiterated that, for example, in some examples, the electrical connector can be inserted into two conductive terminals 30 belonging to different battery cells. Accordingly, the electrical connector can have two ends, both of which can be formed as cylindrical ends adapted to the shape of the hollow cavity 31 described above. In the embodiment, the portion between the two ends can be a cylindrical portion with the same outer diameter and extending along the same axial direction. Therefore, here, the electrical connector as a whole is the cylindrical structure mentioned in the above description.

[0051] However, in other examples, the electrical connector with two ends may not extend axially in the middle of the two ends; for example, it may be bent and extended as needed, thereby enabling the electrical connector to connect two conductive terminals 30 that are not axially opposite each other.

[0052] In addition, in other examples, the electrical connector may have more than two ends, such as three ends, four ends or even more ends, each end of which can be inserted into the hollow cavity 31 of the conductive terminal 30 of different battery cells.

[0053] It should also be noted that the polarity of the conductive terminal 30 is determined by the polarity of the tab 40 connected to the conductive terminal 30. In other words, when the conductive terminal 30 is connected to the positive tab, the aforementioned polarity is positive; conversely, when the conductive terminal 30 is connected to the negative tab, the aforementioned polarity is negative.

[0054] According to the battery cell provided in the embodiments of this application, the conductive terminal 30 is located outside the receiving cavity of the housing 60, and at least the portion of the tab 40 connected to the conductive terminal 30 is located outside the receiving cavity. That is, in the embodiments, the tab 40 extends from the housing 60 and then connects to the conductive terminal 30 outside the receiving cavity. In the embodiments, the conductive terminal 30 and part of the tab 40 are located outside the receiving cavity of the housing 60, so the heat generated by both, as well as the electrical connector connected to the conductive terminal 30, is located outside the housing 60, and has little or no impact on the temperature rise of the battery cell body inside the housing 60.

[0055] According to the battery cell provided in the embodiments of this application, the housing 60 has an opening, through which the tab 40 extends out of the housing 60 to connect with the conductive terminal 30. In the embodiments, the battery cell may further include a first cover plate 50, which can be connected to the housing 60. Specifically, the first cover plate 50 can cover the opening. In the embodiments, the conductive terminal 30 can be connected to the side of the first cover plate 50 away from the cell body, and the portion of the tab 40 connected to the conductive terminal 30 is located on the side of the first cover plate 50 away from the cell body.

[0056] Therefore, in the battery cell provided according to the embodiments of this application, the cell body and the conductive terminal 30 are respectively located on opposite sides of the first cover plate 50, that is, the cell body and the conductive terminal 30 are separated from each other by the first cover plate 50. Therefore, when the electrical connector is connected to the conductive terminal 30, the electrical connector and the cell body are also separated by the first cover plate 50, so that the electrical connector and the cell body are housed in independent accommodating spaces.

[0057] Prior to this application, in related technologies, the battery cell body and the tab 40 were entirely housed within the cavity of the housing 60. The adapter structure was also located within the cavity of the housing 60, and a portion of the terminal post was exposed within the cavity of the housing 60 for connection by the adapter structure. In other words, the adapter structure, a portion of the terminal post, the tab 40, and the battery cell body all coexisted within the cavity of the housing 60. The heat generated by these components was concentrated within the cavity of the housing 60, resulting in rapid temperature rise within the housing 60. The only effective external heat dissipation structure was the portion of the terminal post exposed outside the housing 60.

[0058] However, in the battery cell provided according to the embodiments of this application, since the conductive terminal 30 and the electrical connector are located in different accommodating spaces from the cell body, the heat generated by the conductive terminal 30, the electrical connector, and the tabs 40 extending partially out of the housing 60 is generated directly outside the housing 60. This heat is easily transferred to the external environment and has little or no impact on the temperature rise of the cell body inside the housing 60. Therefore, the battery cell provided according to the embodiments of this application has better outward heat conduction capability compared to battery cells in related technologies. This is beneficial for reducing the internal temperature rise of the battery cell and resulting in better thermodynamic performance of the battery cell.

[0059] In an embodiment, as an example, the housing 60 mentioned above may be a housing 60 with an opening at the top, where the first cover plate 50 may be disposed over the opening at the top of the housing 60. According to the battery cell provided in the embodiments of this application, as an example, a portion of the first cover plate 50 may be formed of an insulating material, such as plastic, capable of providing insulation protection between the conductive terminals 30 and the cell body, and between the two polarities of the conductive terminals 30. That is, in an embodiment, the conductive terminals 30 may be disposed on the upper side of the first cover plate 50, the cell body may be located on the lower side of the first cover plate 50, and the electrical connectors may be located on the upper side of the first cover plate 50.

[0060] In one embodiment, the first cover plate 50 and / or the housing 60 have a through portion, through which the electrode tab 40 passes and is connected to the conductive terminal 30.

[0061] As an example, such as Fig. 2 As shown, the first cover plate 50 may have a recessed portion recessed into the interior of the first cover plate 50 at its edge, which serves as the through portion as described above. In an embodiment, the recessed portion and the inner edge of the opening of the housing 60 together define a through hole through which the tab 40 passes. In an embodiment, the through portion can be sealed, for example by filling the space between the tab 40 and the inner edge of the through portion and the inner edge of the opening of the housing 60 with sealant, thereby sealing the through portion and insulating the tab 40 from the housing 60.

[0062] In some examples not shown, a through-hole may be directly formed on the housing 60, for example, on the side of the housing 60, through which the tab 40 is introduced. Similarly, in these examples, the through-hole may be sealed with sealant, thereby insulating the tab 40 from the housing 60.

[0063] According to the battery cell provided in the embodiments of this application, as an example, the number of conductive terminals 30 can be multiple, and the first cover plate 50 has multiple regions corresponding one-to-one with the conductive terminals 30, that is, each region is provided with a corresponding conductive terminal 30. In the embodiments, the regions with different polarities in the aforementioned multiple regions are insulated from each other, thereby avoiding short circuits caused by shorting between the conductive terminals 30 corresponding to each region and the conductive terminals 30 corresponding to regions with different polarities.

[0064] In one embodiment, as an example, the number of conductive terminals 30 may be two, respectively connecting the positive and negative terminals of the battery cell 20. In another embodiment, as an example, since the first cover plate 50 can be formed entirely of insulating material, the two areas where the two conductive terminals 30 are respectively located are naturally also insulated from each other.

[0065] In an embodiment, the conductive terminal 30 may further include ear plates 32 located at both ends along the axial direction of the main body. The two ear plates 32 may also have through holes communicating with the cavity of the main body. For example, the through holes of the ear plates 32 may also serve as the aforementioned hollow cavity 31 together with the cavity of the main body. In an embodiment, the ear plates 32 may be connected to the first cover plate 50. For example, the ear plates 32 may be formed of a metal material such as copper or aluminum. During the molding of the first cover plate 50, plastic may be wrapped around the outside of the ear plates 32, and the ear plates 32 may be connected to the first cover plate 50. In an embodiment, for the main body of a conductive terminal 30, the two ear plates 32 effectively support the main body on the first cover plate 50; in other words, the main body and the first cover plate 50 are spaced apart.

[0066] According to the battery cell provided in the embodiments of this application, the battery cell may further include a second cover plate. The second cover plate may be located outside the conductive terminal 30, and the second cover plate may be connected to the first cover plate 50 and seal the tab 40 connected to the conductive terminal 30. As mentioned above, the first cover plate 50 may be disposed on the opening of the housing 60 to seal the housing 60 by directly connecting to the housing 60. As an example, in the embodiment, the second cover plate of the battery cell is essentially an outer cover plate located outside the first cover plate 50, while the first cover plate 50 is formed as an essentially inner cover plate. Therefore, the second cover plate serves to isolate the conductive terminal 30 and the tab 40 from the external environment.

[0067] According to the battery cell provided in this application, the first cover plate 50 substantially seals the housing 60, the first cover plate 50 is connected to and fixed to the conductive terminal 30, and the first cover plate 50 is also connected to the conductive terminal 30 and the second cover plate, such that the second cover plate is located outside the first cover plate 50 and the conductive terminal 30.

[0068] According to the battery cell provided in the embodiments of this application, the first cover plate 50 extends outward from the hollow cavity 31 along both ends of the conductive terminal 30. The extended edge of the first cover plate 50 is connected to the housing 60 to enclose a part of the tab 40 and the cell body of the cell 20 inside the housing 60. In other words, as described above, the first cover plate 50 completely covers and seals the opening of the housing 60.

[0069] According to the battery cell provided in the embodiments of this application, the hollow cavity 31 may have internal threads, and the electrical connector may have external threads. The internal threads and external threads form a threaded connection to fix the conductive terminal 30 and the electrical connector. In the embodiments, the threaded connection helps to ensure the reliability of the connection and allows for adjustment of the connection length.

[0070] Based on the technical features described above, the following general description will be based on the battery cell provided according to the first aspect of the embodiments of this application.

[0071] As an example, a battery cell can be, for example, a power battery, which can provide driving force for a pure electric vehicle or a hybrid electric vehicle. The electrical devices mentioned below can be, for example, the aforementioned pure electric vehicle or hybrid electric vehicle. In the battery cell provided in this application embodiment, the conductive terminals 30 and the cell 20 of the battery cell are respectively located on both sides of the first cover plate 50, and each has an independent space.

[0072] In this embodiment, the first cover plate 50 of the battery cell can be weldable. For example, it can be made of plastic material in the portion corresponding to the conductive terminal 30, while a metal material, such as aluminum, is spliced ​​and connected at the edge of the first cover plate 50. This aluminum material can be encapsulated within the aforementioned portion formed of plastic material during injection molding, thereby enabling welding connection to the housing 60. Furthermore, since the first cover plate 50 and the conductive terminal 30 can be an integral structure through injection molding, it is beneficial to reduce the number of welding operations and the amount of weld slag generated.

[0073] In this embodiment, since the tab 40 extends to the side of the first cover plate 50 opposite to the cell 20, the tab 40 is independent of the space of the housing 60 where the cell 20 is located. The first top cover isolates the tab 40 from contact with the internal cell 20, eliminating the risk of the tab 40 of the cell 20 being inserted backwards from the source and improving the safety performance of the battery cell.

[0074] In this embodiment, the inner side of the first cover plate 50 can be treated with a heat-insulating coating to prevent the heat generated by the battery cell on the conductive terminal 30 structure from being conducted into the casing 60, thereby reducing the factors that could cause runaway due to excessively high temperatures inside the cell 20. As an example, the cell 20 can be a double-core structure or a single-core structure, and its tabs 40 can be directly soldered to the conductive terminal 30.

[0075] Furthermore, in the prior art, the connection between the terminal and the adapter is usually achieved by laser welding. This welding method can easily result in weld slag remaining inside the battery cell. In this embodiment, the conductive terminal 30 is designed to accept the inserted electrical connector during the initial manufacturing process, effectively eliminating the weld slag caused by the welding of the two components.

[0076] Furthermore, because the structure of the conductive terminal that serves as the transition between the tab and the terminal post differs from the transition piece structure in related technologies, the manufacturing process of the battery cell provided in this application differs significantly from that of existing battery cells. The manufacturing process includes coating, rolling, die-cutting, winding, welding the tabs, casing, welding the top cover, electrolyte injection, capacity formation, and packaging. In this embodiment, the first cover plate 50 and the conductive terminal can be an integral structure, reducing the number of welding operations and the amount of weld slag generated.

[0077] Furthermore, according to the battery cell provided in the embodiments of this application, since the electrical connector, which serves as the terminal post and the busbar structure, can have a threaded hole structure, the battery cell does not need to be connected in series with the battery via welding during subsequent battery pack assembly. As mentioned above, this eliminates the welding slag caused by the connection of the battery module.

[0078] Furthermore, the battery cell provided according to the embodiments of this application, due to its heat dissipation capacity and thermodynamic properties, can meet the fast charging requirements of 3C or even 4C.

[0079] A battery pack according to an embodiment of this application includes a plurality of battery cells as described above. Electrical connectors are inserted into the conductive terminals 30 of adjacent battery cells to electrically connect adjacent battery cells. In this embodiment, the battery pack also includes the aforementioned beneficial effects, which will not be repeated here. As an example, the battery pack may include a housing, and the plurality of battery cells described above may be arranged in an array within the housing to form the battery pack.

[0080] In this embodiment, the form of the battery pack is not limited to whether it includes battery modules. That is, the multiple battery cells in the battery pack can be pre-formed into battery modules and then installed into the battery pack, or they can be gradually assembled into battery modules within the casing. In addition, the multiple battery cells in the battery pack can also be assembled into the casing in a module-free form using cell-to-pack (CTP).

[0081] An electrical device according to an embodiment of this application includes the battery cell module as described above, and also includes the aforementioned beneficial effects. In the embodiment, as an example, the electrical device may be, for example, an electric vehicle.

[0082] The above are merely preferred embodiments of this application and do not limit the scope of protection of this application. Any equivalent structural transformations made based on the innovative concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A battery cell, characterized by, The battery cell comprises a shell (60), an electric core (20), a conductive terminal (30) and an electric connector; The shell (60) has a containing cavity inside the shell (60), the electric core (20) comprises an electric core body arranged inside the containing cavity and a tab connected to the electric core body; The conductive terminal (30) has an outer surface and an inner surface, a hollow cavity (31) is defined inside the conductive terminal (30) by the inner surface, the outer surface is electrically connected with the tab (40), and the electric connector is inserted into the hollow cavity (31) to be electrically connected with the inner surface; The electric connector is used to electrically connect the battery cell where the electric connector is located and the remaining battery cells adjacent to the battery cell.

2. The battery cell of claim 1, wherein, The conductive terminal (30) is located outside the containing cavity, and at least a part of the tab (40) connected with the conductive terminal (30) is located outside the containing cavity.

3. The battery cell according to claim 1, wherein The shell (60) has an opening; The battery cell further comprises a first cover plate (50), the first cover plate (50) is connected with the shell (60), and the first cover plate (50) is arranged at the opening; The conductive terminal (30) is connected to a side of the first cover plate (50) away from the electric core body, and the part of the tab (40) connected with the conductive terminal (30) is located at the side of the first cover plate (50) away from the electric core body.

4. The battery cell of claim 3, wherein, The first cover plate (50) and / or the shell (60) is provided with a through portion, and the tab (40) passes through the through portion and is connected to the conductive terminal (30).

5. The battery cell of claim 3, wherein, The number of the conductive terminals (30) is plural, the first cover plate (50) has a plurality of regions corresponding to the conductive terminals (30) one by one, and the regions of different polarities are insulated from each other; The polarity represents the polarity of the tab connected with the conductive terminal (30) arranged on the region.

6. The battery cell of claim 3, wherein, The battery cell further comprises a second cover plate, the second cover plate is located outside the conductive terminal (30), the second cover plate is connected with the first cover plate (50) and is sealingly connected with the tab (40) of the conductive terminal (30).

7. The battery cell of claim 6, wherein, The first cover plate (50) extends outwardly away from the hollow cavity (31) along the two end surfaces of the conductive terminal (30), and the extended edge of the first cover plate (50) is connected with the shell (60) to seal at least part of the tab (40) in the shell (60).

8. The battery cell of any one of claims 1 to 6, wherein, An inner thread is arranged on the inner surface, the electric connector has an outer thread, and the inner thread and the outer thread are in threaded connection to fix the conductive terminal (30) and the electric connector.

9. A battery pack, characterized by, A plurality of battery cells as claimed in any one of claims 1-8 are included, and the electric connectors are inserted into the conductive terminals (30) of the adjacent battery cells to electrically connect the adjacent battery cells.

10. An electric device, characterized by A battery pack as claimed in claim 9 is included.

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