Battery cell, electric equipment and preparation method of battery cell

Abstract

The invention provides a battery cell, electric equipment and a preparation method of the battery cell, the battery cell comprises a shell, a shell cover, a pole, a conductive part and an electrode assembly, and the shell is provided with a first opening. The shell cover covers the first opening, a containing cavity is defined by the shell cover and the shell jointly, and the shell cover is provided with a first through hole. And the pole is arranged on the shell cover and is in insulated connection with the shell cover. The conductive part is arranged on the side, back to the containing cavity, of the shell cover and covers the first through hole. The electrode assembly is arranged in the containing cavity and comprises a first tab and a second tab which are opposite in polarity, the first tab is connected with the pole, and the second tab is connected with the conductive part. The space utilization rate of the accommodating cavity can be improved, the energy density of the battery cell can be improved, the first tab and the second tab cannot be folded irregularly in the accommodating cavity, the possibility that the first tab and the second tab are damaged can be reduced, and the safety of the battery cell can be improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and more particularly, to a battery cell, an electrical device using the same, and a method for manufacturing the battery cell. Background Art

[0002] With the rapid development of electronic information technology, various electronic devices are also developing towards the direction of intelligence and multi-functionality, and the requirement for the energy density of batteries is getting higher and higher.

[0003] Currently, in hard-shell battery cells and laminated batteries, generally, a space needs to be reserved between at least one side wall of the outer shell and the electrode assembly for welding the tab of the electrode assembly to the outer shell or the pole column on the outer shell, which will affect the space utilization rate inside the outer shell, and thus affect the energy density of the battery cell. In wound batteries, the support member of the wound battery cell needs to pass through the central hole to press against the tab for welding, resulting in an overly large central hole, which also affects the energy density. Summary of the Invention

[0004] This application provides a battery cell, an electrical device using the same, and a method for manufacturing the battery cell, which can improve the energy density of the battery cell.

[0005] In a first aspect, this application provides a battery cell, which includes a housing, a cover, a pole column, a conductive member, and an electrode assembly. The housing has a first opening. The cover is disposed on the first opening, and the cover and the housing together enclose a receiving cavity. The cover has a first through hole. The pole column is disposed on the cover and is insulatedly connected to the cover. The conductive member is disposed on a side of the cover facing away from the receiving cavity and covers the first through hole. The electrode assembly is disposed in the receiving cavity and includes a first tab and a second tab with opposite polarities. The first tab is connected to the pole column, and the second tab is connected to the conductive member.

[0006] In the above technical solution, by providing the cover with a first through hole and disposing the conductive member on a side of the cover facing away from the receiving cavity, after the electrode assembly and the cover are combined, the second tab can extend out of the first through hole and be connected to the conductive member. Therefore, the second tab can be connected to the conductive member on a side of the cover facing away from the electrode assembly, without connecting the second tab to the housing and without reserving a connection space for the second tab between the cover and the electrode assembly, which can improve the space utilization rate of the receiving cavity, increase the energy density of the battery cell, and the first tab and the second tab will not be randomly folded in the receiving cavity, which can reduce the possibility of damage to the first tab and the second tab and is beneficial to improving the safety of the battery cell.

[0007] In some embodiments of this application, the second tab penetrates through the first through hole.

[0008] In the above technical solution, since the conductive member is disposed on the side of the housing cover facing away from the accommodation cavity, and the second tab penetrates through the first through hole and is connected to the conductive member, after the conductive member is installed with the housing cover, the connection between the second tab and the conductive member is firm, and the entire conductive member is located on the side of the housing cover facing away from the accommodation cavity, reducing the possibility of the conductive member contacting and short-circuiting other components of the electrode assembly, which is beneficial to improving the safety of the battery cell.

[0009] In some embodiments of the present application, the battery cell includes an adhesive member, and the conductive member is connected to the housing cover through the adhesive member.

[0010] In the above technical solution, the conductive member is connected to the housing cover through the adhesive member, which can make the connection process between the conductive member and the housing cover simple, beneficial to improving the preparation efficiency of the battery cell, and can achieve the insulated connection between the conductive member and the housing cover through the adhesive member. The battery cell can be connected to the load of the electrical device through the pole column and the conductive member to realize power supply.

[0011] In some embodiments of the present application, the conductive member is welded to the housing cover.

[0012] In the above technical solution, the conductive member is welded to the housing cover, which can make the connection between the conductive member and the housing cover firm, reducing the possibility of the conductive member detaching from the housing cover and causing the battery cell to open circuit or the conductive member to contact and short-circuit other components, improving the safety of the battery cell, and the battery cell can be connected to the load of the electrical device through the pole column and one of the conductive member, the housing cover, and the housing body to realize power supply.

[0013] In some embodiments of the present application, an insulating member is disposed on the side of the housing cover facing the accommodation cavity. The insulating member is provided with a second through hole, and the second tab penetrates through the second through hole and is connected to the conductive member.

[0014] In the above technical solution, by disposing an insulating member on the side of the housing cover facing the accommodation cavity, the insulating member is provided with a second through hole, the second tab penetrates through the second through hole and is connected to the conductive member, when the conductive member is insulated from the housing cover, the insulation between the second tab and the housing cover can be achieved through the insulating member, reducing the possibility of the second tab contacting and short-circuiting the housing cover or other components, which is beneficial to improving the safety of the battery cell.

[0015] In some embodiments of the present application, one end of the housing body forms a first opening along a first direction. The electrode assembly includes a main body. Along a second direction perpendicular to the first direction, the first tab and the second tab are respectively connected to two sides of the main body.

[0016] In the above technical solution, by arranging the first tab and the second tab to be respectively connected to two sides of the main body along the second direction and separated from each other, the possibility of the first tab and the second tab coming into contact and short-circuiting can be reduced, the safety of the battery cell can be improved, and it is convenient for the first tab to extend out of the first opening along the first direction and be connected to the terminal, and for the second tab to extend out of the first opening along the first direction and be connected to the conductive member.

[0017] In some embodiments of the present application, the housing includes a bottom wall and a side wall. Along the first direction, the bottom wall is disposed opposite to the housing cover, and the side wall surrounds the bottom wall. The first tab includes a connected first portion and a second portion. The first portion is located between the main body and the side wall, and the second portion is located between the main body and the housing cover. The second portion is connected to the terminal. The second tab includes a connected third portion and a fourth portion. The third portion is located between the main body and the side wall, and the fourth portion is located between the main body and the housing cover. The fourth portion is connected to the conductive member.

[0018] In the above technical solution, by making the first tab include a connected first portion and a second portion, with the first portion located between the main body and the side wall and the second portion located between the main body and the housing cover, that is, the first tab is bent, it is convenient for the second portion to be connected to the terminal; by making the second tab include a connected third portion and a fourth portion, with the third portion located between the main body and the side wall and the fourth portion located between the main body and the housing cover, that is, the second tab is bent, it is convenient for the fourth portion to be connected to the conductive member.

[0019] In some embodiments of the present application, the electrode assembly is a laminated structure.

[0020] In the above technical solution, in a hard-shell battery cell, since the wound electrode assembly will form a central hole at the winding center or a large gap between the electrode assembly and the top corner of the outer shell, resulting in the wound electrode assembly occupying a relatively small space inside the outer shell and the energy density of the battery cell being relatively low. In the present application, by making the electrode assembly a laminated structure, no voids are generated inside the electrode assembly, and the gap between the electrode assembly and the housing and the housing cover is relatively small, which can improve the space utilization rate of the accommodation cavity and thus improve the energy density of the battery cell.

[0021] In some embodiments of the present application, the housing cover has a third through hole. The terminal includes a first section and a second section. The first section is disposed on the side of the housing cover facing the accommodation cavity and covers the third through hole. The diameter of the second section is smaller than that of the first section. The second section is connected to the side of the first section facing away from the accommodation cavity and penetrates through the third through hole.

[0022] In the above technical solution, by making the terminal post include a first section and a second section, with the first section disposed on the side of the shell cover facing the accommodation cavity and covering the third through-hole, sealing between the terminal post and the shell cover can be achieved. By making the diameter of the second section smaller than that of the first section, with the second section connected to the side of the first section facing away from the accommodation cavity and passing through the third through-hole, it is convenient for the load of the electrical device to be connected to the terminal post, thereby realizing the power supply of the battery cell and reducing the possibility of short circuit between the second section and the shell cover, which is beneficial to improving the safety of the battery cell.

[0023] In some embodiments of the present application, an insulating member is disposed on the side of the shell cover facing the accommodation cavity, and at least a part of the insulating member is located between the first section and the shell cover.

[0024] In the above technical solution, by making at least a part of the insulating member located between the first section and the shell cover, insulation between the terminal post and the shell cover can be achieved, reducing the possibility of short circuit between the terminal post and the shell cover or other components, which is beneficial to improving the safety of the battery cell.

[0025] In some embodiments of the present application, one end of the housing forms a first opening along a first direction. The housing includes a bottom wall, and along the first direction, the bottom wall is disposed opposite to the shell cover, and the bottom wall is provided with a liquid injection hole.

[0026] In the above technical solution, since both the terminal post and the conductive member are disposed on the shell cover, the remaining space on the shell cover is small. By making the bottom wall provided with a liquid injection hole, the size of the liquid injection hole can be set larger, facilitating the injection of the electrolyte, which is beneficial to improving the liquid injection efficiency.

[0027] In some embodiments of the present application, the first pole ear is a positive pole ear, and the second pole ear is a negative pole ear.

[0028] In the above technical solution, by making the first pole ear a positive pole ear and the second pole ear a negative pole ear, the positive pole of the load of the electrical device can be connected to the electrode assembly through the terminal post, and the negative pole of the load can be connected to the electrode assembly through the conductive member.

[0029] In some embodiments of the present application, the battery cell is a button battery cell.

[0030] In the above technical solution, since currently button battery cells generally adopt a wound electrode assembly, and the positive pole ear and the negative pole ear of the electrode assembly are respectively disposed at both ends in the axial direction of the electrode assembly, and the space utilization rate of the wound electrode assembly in the outer shell is low, and space needs to be reserved at both ends in the axial direction of the electrode assembly for welding the pole ears, further affecting the space utilization rate in the outer shell, resulting in a low energy density of the battery cell. In the present application, by making the battery cell a button battery cell and applying the foregoing battery cell structure to the button battery cell, the energy density of the button battery cell can be greatly improved.

[0031] In a second aspect, the present application provides an electrical device, including the above-mentioned battery cell, and the battery cell is used to provide electrical energy.

[0032] In a third aspect, the present application provides a method for preparing a battery cell, including: providing a housing, an electrode assembly, and a cell cover assembly. The cell cover assembly includes a cell cover and a pole column arranged on the cell cover, and the pole column is insulated from the cell cover. First, connect the first pole tab of the electrode assembly to the pole column, then pass the second pole tab of the electrode assembly through the first through hole of the cell cover, and connect the second pole tab to a conductive member. Connect the conductive member to the cell cover so that the conductive member covers the first through hole. Place the electrode assembly into the housing. Connect the cell cover to the housing.

[0033] In the above technical solution, by first connecting the first pole tab of the electrode assembly to the pole column, then passing the second pole tab of the electrode assembly through the first through hole of the cell cover, and connecting the second pole tab to the conductive member; connecting the conductive member to the cell cover so that the conductive member covers the first through hole, after the electrode assembly and the cell cover are combined, the second pole tab can extend out of the first through hole and be connected to the conductive member. Therefore, the second pole tab can be connected to the conductive member on the side of the cell cover facing away from the electrode assembly, without leaving a connection space for the second pole tab between the cell cover and the electrode assembly, which can improve the space utilization rate of the accommodation cavity, increase the energy density of the battery cell, and the first pole tab and the second pole tab will not be folded randomly in the accommodation cavity, which can reduce the possibility of damage to the first pole tab and the second pole tab, and is beneficial to improving the safety of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings.

[0035] Figure 1 A three-dimensional structure diagram of a battery cell provided by some embodiments of the present application;

[0036] Figure 2 An exploded structure diagram of a battery cell provided by some embodiments of the present application;

[0037] Figure 3 A cross-sectional structure diagram of a battery cell provided by some embodiments of the present application;

[0038] Figure 4 For Figure 3 A partial enlarged structure diagram of part A of the battery cell in

[0039] Figure 5 A partial enlarged structure diagram of a battery cell provided by some other embodiments of the present application;

[0040] Figure 6 Schematic perspective view of the electrode assembly of the battery cell provided in some embodiments of the present application;

[0041] Figure 7 For Figure 3 Partial enlarged structural view of the B position of the battery cell in

[0042] Figure 8 Schematic perspective view of the housing of the battery cell provided in some embodiments of the present application;

[0043] Figure 9 Schematic flow chart of the manufacturing method of the battery cell provided in some embodiments of the present application;

[0044] Figure 10 Schematic structural view of the connection between the electrode assembly and the pole post of the battery cell provided in some embodiments of the present application;

[0045] Figure 11 Schematic structural view of the connection between the electrode assembly and the conductive member of the battery cell provided in some embodiments of the present application.

[0046] Reference numerals: 10 - battery cell; 100 - housing; 101 - first opening; 102 - accommodating cavity; 103 - liquid injection hole; 110 - bottom wall; 120 - side wall; 200 - cover; 201 - first through hole; 202 - third through hole; 210 - pole post; 211 - first section; 212 - second section; 220 - conductive member; 230 - adhesive member; 240 - insulating member; 241 - second through hole; 300 - electrode assembly; 310 - main body; 311 - first electrode tab; 312 - second electrode tab; 320 - first tab; 321 - first part; 322 - second part; 330 - second tab; 331 - third part; 322 - fourth part; X - first direction; Y - second direction. Detailed embodiments

[0047] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application fall within the scope of protection of the present application.

[0048] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs; the terms used in the description of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the description and claims of the present application and the above drawings are intended to cover non-exclusive inclusion.

[0049] The terms "first", "second", etc. in the description and claims of this application or in the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or primary-secondary relationship.

[0050] Referring to "embodiment" in this application means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of this application. The appearance of this phrase at various positions in the description does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0051] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted.

[0052] With the development of the new energy industry, batteries are gradually developing towards high energy density and high power density. Hard shell battery cells are widely used in various electrical equipment due to their high mechanical strength. However, in current hard shell battery cells, the internal space utilization rate of the outer shell (including the housing and the cover) is relatively low, and the energy density of the battery cell is relatively low.

[0053] For example, in a button battery cell with a wound electrode assembly, one tab is welded to the cover and the other tab is welded to the bottom of the housing. There is a large gap (the original winding pin position) in the center of the electrode assembly, and there are multiple layers of separators in the center, occupying a large space. During the welding process of the tabs, the support post needs to pass through the center hole of the battery cell to press against the tab at the bottom of the housing to realize the welding of the tab and the housing. Therefore, the center hole is relatively large. After the electrode assembly is installed in the outer shell, space needs to be reserved axially between the electrode assembly and the cover to reduce the risk of short circuit due to contact between the electrode assembly and the cover. Therefore, due to the wound structure of the electrode assembly itself, the internal space utilization rate of the outer shell is relatively low, and the energy density of the battery cell is relatively low.

[0054] For another example, in a button battery cell with a stacked electrode assembly, the two tabs of the electrode assembly are respectively welded to the cover and the side wall of the housing. The side wall of the housing is provided with an inwardly concave connecting portion for connecting with the tab. The connecting portion will reduce the internal space of the housing, and space needs to be reserved between the tab and the side wall of the housing for accommodating the tab clamping device. During welding, the clamping device extends into the space between the electrode assembly and the side wall of the housing to make the tab in close contact with the side wall of the housing, and then a laser emitting device located outside the housing emits laser towards the tab. The laser penetrates the housing to weld the tab and the housing. After welding is completed, the clamping device is withdrawn, leaving a large gap between the electrode assembly and the housing, affecting the internal space utilization rate of the outer shell and thus the energy density of the battery cell.

[0055] In order to improve the energy density of the battery cell, the present application provides a battery cell, which includes a housing, a cover, a terminal, a conductive member, and an electrode assembly. The housing has a first opening. The cover is disposed on the first opening, and the cover and the housing together define a receiving cavity. The cover has a first through hole. The terminal is disposed on the cover and is insulatedly connected to the cover. The conductive member is disposed on a side of the cover facing away from the receiving cavity and covers the first through hole. The electrode assembly is disposed in the receiving cavity and includes a first tab and a second tab with opposite polarities. The first tab is connected to the terminal, and the second tab is connected to the conductive member.

[0056] In the battery cell with this structure, by providing the cover with the first through hole and disposing the conductive member on a side of the cover facing away from the receiving cavity, after the electrode assembly and the cover are combined, the second tab can extend out of the first through hole and be connected to the conductive member. Therefore, the second tab can be connected to the conductive member on a side of the cover facing away from the electrode assembly, without reserving a connection space for the second tab between the cover and the electrode assembly, which can improve the space utilization rate of the receiving cavity, increase the energy density of the battery cell, and the first tab and the second tab will not be folded randomly in the receiving cavity, which can reduce the possibility of damage to the first tab and the second tab and is beneficial to improving the safety of the battery cell.

[0057] The battery cell provided by the embodiments of the present application can be a secondary battery or a primary battery, such as a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and the embodiments of the present application are not limited thereto. The electrochemical device can be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, etc., and the embodiments of the present application are also not limited thereto.

[0058] The embodiments of the present application provide an electrical device using the battery cell as a power source. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric vehicle, a ship, a spacecraft, etc.

[0059] See Figure 1 and Figure 2 , Figure 1 is a schematic perspective view of the battery cell provided by some embodiments of the present application; Figure 2 is an exploded schematic view of the battery cell provided by some embodiments of the present application.

[0060] An embodiment of the present application provides a battery cell 10, which includes a housing 100, a cover 200, a terminal 210, a conductive member 220, and an electrode assembly 300. The housing 100 has a first opening 101. The cover 200 is disposed on the first opening 101. The cover 200 and the housing 100 together define a receiving cavity 102. The cover 200 has a first through hole 201. The terminal 210 is disposed on the cover 200 and is insulated from the cover 200. The conductive member 220 is disposed on a side of the cover 200 facing away from the receiving cavity 102 and covers the first through hole 201. The electrode assembly 300 is disposed in the receiving cavity 102. The electrode assembly 300 includes a first tab 320 and a second tab 330 with opposite polarities. The first tab 320 is connected to the terminal 210, and the second tab 330 is connected to the conductive member 220.

[0061] By making the cover 200 have the first through hole 201 and disposing the conductive member 220 on a side of the cover 200 facing away from the receiving cavity 102, after the electrode assembly 300 and the cover 200 are combined, the second tab 330 can extend out of the first through hole 201 and be connected to the conductive member 220. Therefore, the second tab 330 can be connected to the conductive member 220 on a side of the cover 200 facing away from the electrode assembly 300, without reserving a connection space for the second tab 330 between the cover 200 and the electrode assembly 300, which can improve the space utilization rate of the receiving cavity 102, increase the energy density of the battery cell 10, and the first tab 320 and the second tab 330 will not be folded randomly in the receiving cavity 102, which can reduce the possibility of damage to the first tab 320 and the second tab 330, and is beneficial to improving the safety of the battery cell 10.

[0062] In some embodiments, both the housing 100 and the cover 200 can be made of materials with high strength, such as metal materials like steel and aluminum alloy, so that the housing 100 and the cover 200 have high mechanical properties, and thus the housing 100 and the cover 200 are not easily deformed or damaged due to force or environmental changes, and the reliability of the battery cell 10 can be improved.

[0063] In other embodiments, the housing 100 and the cover 200 can also be non-metal materials with high strength, such as carbon fiber and hard plastics.

[0064] In some embodiments, the terminal 210 and the conductive member 220 can be made of materials with good electrical conductivity, such as metal materials like lead and copper.

[0065] In some embodiments, the terminal 210 and the conductive member 220 can be arranged in shapes such as circular, square, and oval.

[0066] In some embodiments, the housing 100 and the housing cover 200 can be connected by welding. This can make the connection between the housing 100 and the housing cover 200 stable, with better sealing of the battery cell 10. The battery cell 10 is not easily subjected to force or environmental changes that may cause a gap or separation between the housing 100 and the housing cover 200, and the reliability of the battery cell 10 is relatively high.

[0067] In some embodiments, the first tab 320 is connected to the terminal post 210 by welding. This can make the connection between the first tab 320 and the terminal post 210 stable, and the first tab 320 is not easily detached from the terminal post 210, which may cause an open circuit of the battery cell 10 or a short circuit due to contact with other components. The safety and reliability of the battery cell 10 are relatively high.

[0068] In some embodiments, the second tab 330 is connected to the conductive member 220 by welding. This can make the connection between the second tab 330 and the conductive member 220 stable, and the second tab 330 and the conductive member 220 are not easily caused to result in an open circuit of the battery cell 10 or a short circuit due to contact with other components. The safety and reliability of the battery cell 10 are relatively high.

[0069] Refer to Figure 3 and Figure 4 , Figure 3 which is a schematic cross-sectional structure diagram of a battery cell provided in some embodiments of the present application; Figure 4 is Figure 3 a partially enlarged structure diagram of the A position of the battery cell in

[0070] In some embodiments, the second tab 330 penetrates through the first through hole 201.

[0071] Since the conductive member 220 is disposed on the side of the housing cover 200 facing away from the accommodation cavity 102, and the second tab 330 penetrates through the first through hole 201 and is connected to the conductive member 220, after the conductive member 220 is installed with the housing cover 200, the connection between the second tab 330 and the conductive member 220 is stable, and the entire conductive member 220 is located on the side of the housing cover 200 facing away from the accommodation cavity 102, reducing the possibility of short circuit due to contact between the conductive member 220 and other components of the electrode assembly 300, which is beneficial to improving the safety of the battery cell 10.

[0072] In some embodiments, the conductive member 220 is connected to the housing cover 200 by welding.

[0073] By connecting the conductive member 220 to the housing cover 200 by welding, the connection between the conductive member 220 and the housing cover 200 can be made stable, reducing the possibility of the conductive member 220 being detached from the housing cover 200, which may cause an open circuit of the battery cell 10 or a short circuit due to contact between the conductive member 220 and other components. The safety of the battery cell 10 can be improved, and the battery cell 10 can be connected to the load of the electrical device through one of the terminal post 210, the conductive member 220, the housing cover 200, and the housing 100 to achieve power supply.

[0074] Refer toFigure 5 , Figure 5 This is a partially enlarged structural schematic diagram of the battery cell provided in some other embodiments of the present application.

[0075] In some other embodiments, the battery cell 10 includes an adhesive member 230, and the conductive member 220 is connected to the cell cover 200 through the adhesive member 230.

[0076] The conductive member 220 is connected to the cell cover 200 through the adhesive member 230, which can make the connection process between the conductive member 220 and the cell cover 200 simple, conducive to improving the preparation efficiency of the battery cell 10. The battery cell 10 can be connected to the load of the electrical device through the pole 210 and the conductive member 220 to achieve power supply.

[0077] In some embodiments, the adhesive member 230 is made of an insulating material, such as epoxy resin, polypropylene, polyolefin, rubber, etc., and the insulating connection between the conductive member 220 and the cell cover 200 can be achieved through the adhesive member 230.

[0078] In some other embodiments, the adhesive member 230 can be made of a conductive material, such as conductive glue. One end of the load of the electrical device is connected to the pole 210, and the other end is connected to one of the conductive member 220, the housing 100 or the cell cover 200, so that the battery cell 10 can supply power to the load.

[0079] See Figures 1 to 4 , in some embodiments, an insulating member 240 is provided on the side of the cell cover 200 facing the accommodation cavity 102. The insulating member 240 is provided with a second through hole 241, and the second tab 330 passes through the second through hole 241 and is connected to the conductive member 220.

[0080] The insulating member 240 can be epoxy resin, polypropylene, polyolefin, rubber, etc.

[0081] By providing the insulating member 240 on the side of the cell cover 200 facing the accommodation cavity 102, the insulating member 240 is provided with the second through hole 241, and the second tab 330 passes through the second through hole 241 and is connected to the conductive member 220, it can be ensured that when the conductive member 220 is insulated from the cell cover 200, the insulation between the second tab 330 and the cell cover 200 is achieved through the insulating member 240, reducing the possibility of short circuit between the second tab 330 and the cell cover 200 or other components, which is conducive to improving the safety of the battery cell 10.

[0082] See Figure 2 and Figure 6 , Figure 6 This is a three-dimensional structural schematic diagram of the electrode assembly of the battery cell provided in some embodiments of the present application.

[0083] In some embodiments, one end of the housing 100 in the first direction X forms a first opening 101. The electrode assembly 300 includes a main body 310. Along the second direction Y, a first tab 320 and a second tab 330 are respectively connected to two sides of the main body 310, and the second direction Y is perpendicular to the first direction X.

[0084] The two sides here do not necessarily mean the two farthest ends, and there can be a certain deviation. The connection line between the center of the width of the first tab 320 and the center of the electrode assembly 300 is the first connection line, and the connection line between the center of the width of the second tab 330 and the center of the electrode assembly 300 is the second connection line. An included angle between the first connection line and the second connection line within 120° to 180° is considered as two sides.

[0085] By making the first tab 320 and the second tab 330 respectively connected to two sides of the main body 310 along the second direction Y, the possibility of the first tab 320 and the second tab 330 contacting and short - circuiting can be reduced, the safety of the battery cell 10 can be improved, and it is convenient for the first tab 320 to extend out of the first opening 101 in the first direction X and connect to the terminal post 210, and it is convenient for the second tab 330 to extend out of the first opening 101 in the first direction X and connect to the conductive member 220.

[0086] In some embodiments, the housing 100 includes a bottom wall 110 and a side wall 120. Along the first direction X, the bottom wall 110 is disposed opposite to the cover 200, and the side wall 120 surrounds the bottom wall 110. The first tab 320 includes a connected first part 321 and a second part 322. The first part 321 is located between the main body 310 and the side wall 120, and the second part 322 is located between the main body 310 and the cover 200. The second part 322 is connected to the terminal post 210. The second tab 330 includes a connected third part 331 and a fourth part 332. The third part 331 is located between the main body 310 and the side wall 120, and the fourth part 332 is located between the main body 310 and the cover 200. The fourth part 332 is connected to the conductive member 220.

[0087] By making the first tab 320 include the connected first part 321 and the second part 322, with the first part 321 located between the main body 310 and the side wall 120 and the second part 322 located between the main body 310 and the cover 200, that is, the first tab 320 is bent, it is convenient for the second part 322 to connect to the terminal post 210; by making the second tab 330 include the connected third part 331 and the fourth part 332, with the third part 331 located between the main body 310 and the side wall 120 and the fourth part 332 located between the main body 310 and the cover 200, that is, the second tab 330 is bent, it is convenient for the fourth part 332 to connect to the conductive member 220.

[0088] In some embodiments, the electrode assembly 300 is a laminated structure.

[0089] In the hard shell battery cell 10, since the electrode assembly 300 with a wound structure will form a center hole at the center of the winding or a large gap between the electrode assembly 300 and the top corners of the outer shell, the electrode group with a wound structure occupies a smaller space inside the outer shell, and the energy density of the battery cell 10 is lower. The present application makes the electrode assembly 300 a stacked structure, so that no gap is generated inside the electrode assembly 300, and the gap between the electrode assembly 300 and the shell 100 and the shell cover 200 is smaller, which can improve the space utilization of the accommodating cavity 102, thereby improving the energy density of the battery cell 10.

[0090] In some embodiments, the main body 310 of the electrode assembly 300 includes a plurality of first pole pieces 311 and a plurality of second pole pieces 312, each of the first pole pieces 311 is connected to a first pole piece 320, and each of the second pole pieces 312 is connected to a second pole piece 330. The plurality of first pole pieces 311 and the plurality of second pole pieces 312 are stacked along the first direction X. Along the second direction Y, the plurality of first pole pieces 320 are located on one side of the main body 310, and the plurality of first pole pieces 320 are gathered and connected along the first direction X. Along the second direction Y, the plurality of second pole pieces 330 are located on the other side of the main body 310, and the plurality of second pole pieces 330 are gathered and connected along the first direction X.

[0091] See also Figure 2 and Figure 7 , Figure 7 for Figure 3 Schematic diagram of the local enlarged structure at B of the middle battery cell.

[0092] In some embodiments, the shell cover 200 has a third through hole 202, and the pole 210 includes a first section 211 and a second section 212. The first section 211 is arranged on the side of the shell cover 200 facing the accommodating cavity 102 and covers the third through hole 202. The diameter of the second section 212 is smaller than the diameter of the first section 211. The second section 212 is connected to the side of the first section 211 facing away from the accommodating cavity 102 and passes through the third through hole 202.

[0093] By making the pole 210 include a first section 211 and a second section 212, the first section 211 is arranged on the side of the shell cover 200 facing the accommodating cavity 102 and covers the third through hole 202, so that the pole 210 and the shell cover 200 can be sealed. By making the diameter of the second section 212 smaller than the diameter of the first section 211, the second section 212 is connected to the side of the first section 211 facing away from the accommodating cavity 102 and passes through the third through hole 202, it is convenient to connect the load of the electrical equipment with the pole 210, thereby realizing the power supply of the battery cell 10, and reducing the possibility of short circuit caused by contact between the second section 212 and the shell cover 200, which is beneficial to improving the safety of the battery cell 10.

[0094] In some embodiments, an insulating member 240 is provided on the side of the housing cover 200 facing the accommodating cavity 102, and at least a part of the insulating member 240 is located between the first section 211 and the housing cover 200.

[0095] By making at least a part of the insulating member 240 located between the first section 211 and the housing cover 200, insulation between the pole column 210 and the housing cover 200 can be achieved, reducing the possibility of short - circuit contact between the pole column 210 and the housing cover 200 or other components, which is beneficial to improving the safety of the battery cell 10.

[0096] In some embodiments, the insulating member 240 located between the first section 211 and the housing cover 200 and the insulating member 240 provided with the second through - hole 241 described above are the same insulating member 240, which can facilitate the simplification of the assembly process of the battery cell 10 and is beneficial to improving the preparation efficiency of the battery cell 10.

[0097] In other embodiments, the insulating member located between the first section 211 and the housing cover 200 and the insulating member provided with the second through - hole 241 may also be two independent insulating members.

[0098] See Figure 2 and Figure 8 , Figure 8 is a schematic perspective view of the housing of the battery cell provided in some embodiments of the present application.

[0099] In some embodiments, one end of the housing 100 along the first direction X forms a first opening 101. The housing 100 includes a bottom wall 110. Along the first direction X, the bottom wall 110 is disposed opposite to the housing cover 200, and the bottom wall 110 is provided with a liquid injection hole 103.

[0100] Since both the pole column 210 and the conductive member 220 are provided on the housing cover 200, the remaining space on the housing cover 200 is small. By making the bottom wall 110 provided with the liquid injection hole 103, the size of the liquid injection hole 103 can be set larger, facilitating the injection of the electrolyte and being beneficial to improving the liquid injection efficiency.

[0101] In some embodiments, the liquid injection hole 103 can be set in a circular, square, elliptical or other shapes.

[0102] In some embodiments, the first pole tab 320 is a positive - pole tab and the second pole tab 330 is a negative - pole tab.

[0103] By making the first pole tab 320 a positive - pole tab and the second pole tab 330 a negative - pole tab, the positive pole of the load of the electrical device can be connected to the electrode assembly 300 through the pole column 210, and the negative pole of the load can be connected to the electrode assembly 300 through the conductive member 220.

[0104] In this embodiment, the housing 100 and the cover 200 can be made of steel shells, and the conductive member 220 can be electrically connected to the cover 200.

[0105] See Figure 2 and Figure 6 , in some embodiments, the first electrode tab 311 is a positive electrode tab, and the first electrode tab 311 is connected to the first tab 320; the second electrode tab 312 is a negative electrode tab, and the second electrode tab 312 is connected to the second tab 330. It can be understood that the connection between the electrode tab and the tab includes but is not limited to integrally formed.

[0106] The battery cell 10 mainly operates by the movement of metal ions between the positive electrode tab and the negative electrode tab. The positive electrode tab includes a positive current collector and a positive active material layer, and the positive active material layer is coated on the surface of the positive current collector. The part of the positive current collector without the positive active material layer serves as the positive electrode tab to realize the electrical energy input or output of the positive electrode tab through the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary material, lithium manganate, etc. The negative electrode tab includes a negative current collector and a negative active material layer, and the negative active material layer is coated on the surface of the negative current collector. The part of the negative current collector without the negative active material layer serves as the negative electrode tab to realize the electrical energy input or output of the negative electrode tab through the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon material or silicon material, etc. The material of the separator can be polypropylene (PP) or polyethylene (PE), etc. The electrolyte can include organic solvents, electrolyte lithium salts, etc.

[0107] In some other embodiments, the first tab 320 is a negative tab, and the second tab 330 is a positive tab. So that the positive electrode of the load of the electrical device can be connected to the electrode assembly 300 through the conductive member 220, and the negative electrode of the load can be connected to the electrode assembly 300 through the terminal 210.

[0108] In this embodiment, the housing 100 and the cover 200 can be made of aluminum shells, and the conductive member 220 can be electrically connected to the cover 200.

[0109] In some embodiments, the battery cell 10 is a button battery cell 10.

[0110] Since the button cell 10 generally adopts a wound electrode assembly 300 at present, and the positive electrode tab and the negative electrode tab of the electrode assembly 300 are respectively arranged at both ends of the axial direction of the electrode assembly 300, and the space utilization rate of the wound electrode assembly 300 in the housing is relatively low, and it is necessary to reserve space at both ends of the axial direction of the electrode assembly 300 for the welding of the tabs, which further affects the space utilization rate in the housing, resulting in a relatively low energy density of the cell 10. In this application, by making the cell 10 a button cell 10 and applying the foregoing cell 10 structure to the button cell 10, the energy density of the button cell 10 can be greatly improved.

[0111] An embodiment of this application provides an electrical device, including the cell 10 of any of the above solutions, and the cell 10 is used to provide electrical energy for the electrical device.

[0112] The electrical device can be any of the foregoing devices or systems applying the cell.

[0113] See Figures 9 to 11 , Figure 9 which is a schematic flow chart of a method for preparing a cell provided in some embodiments of this application; Figure 10 which is a schematic structural diagram of the connection between the electrode assembly and the pole column of the cell provided in some embodiments of this application; Figure 11 which is a schematic structural diagram of the connection between the electrode assembly and the conductive member of the cell provided in some embodiments of this application.

[0114] An embodiment of this application provides a method for preparing a cell 10, including:

[0115] S1. Provide a housing 100, an electrode assembly 300, and a cell cover assembly. The cell cover assembly includes a cell cover 200 and a pole column 210 arranged on the cell cover 200, and the pole column 210 is insulated from the cell cover 200.

[0116] S2. First connect the first tab 320 of the electrode assembly 300 to the pole column 210 (as Figure 10 shown), and then pass the second tab 330 of the electrode assembly 300 through the first through hole 201 of the cell cover 200, and connect the second tab 330 to the conductive member 220 (as Figure 11 shown).

[0117] S3. Connect the conductive member 220 to the cell cover 200 so that the conductive member 220 covers the first through hole 201.

[0118] S4. Install the electrode assembly 300 into the housing 100.

[0119] S5. Connect the cell cover 200 to the housing 100.

[0120] By first connecting the first tab 320 of the electrode assembly 300 to the terminal post 210, then passing the second tab 330 of the electrode assembly 300 through the first through-hole 201 of the shell cover 200, and connecting the second tab 330 to the conductive member 220; connecting the conductive member 220 to the shell cover 200 so that the conductive member 220 covers the first through-hole 201, after the electrode assembly 300 and the shell cover 200 are combined, the second tab 330 can extend out of the first through-hole 201 and be connected to the conductive member 220. Therefore, the second tab 330 can be connected to the conductive member 220 on the side of the shell cover 200 facing away from the electrode assembly 300, without reserving a connection space for the second tab 330 between the shell cover 200 and the electrode assembly 300, which can improve the space utilization rate of the accommodation cavity 102, increase the energy density of the battery cell 10, and the first tab 320 and the second tab 330 will not be folded randomly in the accommodation cavity 102, which can reduce the possibility of damage to the first tab 320 and the second tab 330, and is beneficial to improving the safety of the battery cell 10.

[0121] In some embodiments, the electrode assembly 300 can be first installed in the housing 100 so that the first tab 320 and the second tab 330 extend out of the housing 100, and then the electrode assembly 300, the shell cover assembly and the conductive member 220 are assembled.

[0122] In other embodiments, the electrode assembly 300, the shell cover assembly and the conductive member 220 can also be assembled first, and then the electrode assembly 300 is installed in the housing 100.

[0123] It should be noted that, without conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0124] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that, Comprising: A housing having a first opening; A cover lid covering the first opening, the cover lid and the housing jointly enclosing a receiving cavity, the cover lid having a first through hole; A terminal post disposed on the cover lid and insulatedly connected to the cover lid; A conductive member disposed on a side of the cover lid facing away from the receiving cavity and covering the first through hole; An electrode assembly disposed in the receiving cavity, the electrode assembly including a first tab and a second tab with opposite polarities, the first tab being connected to the terminal post, and the second tab being connected to the conductive member.

2. The battery cell according to claim 1, characterized in that, The second tab penetrates through the first through hole.

3. The battery cell according to claim 1, characterized in that, The battery cell further includes an adhesive member, and the conductive member is connected to the cover lid through the adhesive member.

4. The battery cell according to claim 1, characterized in that, The conductive member is welded to the cover lid.

5. The battery cell according to claim 1, characterized in that, An insulating member is disposed on a side of the cover lid facing the receiving cavity, the insulating member having a second through hole, the second tab penetrates through the second through hole and is connected to the conductive member.

6. The cell according to claim 1, characterized in that, One end of the housing in a first direction forms the first opening; The electrode assembly includes a main body, in a second direction, the first tab and the second tab are respectively connected to two sides of the main body, and the second direction is perpendicular to the first direction.

7. The battery cell according to claim 6, wherein The housing includes a bottom wall and a side wall, in the first direction, the bottom wall is disposed opposite to the cover lid, and the side wall surrounds the bottom wall; The first tab includes a connected first portion and a second portion, the first portion is located between the main body and the side wall, the second portion is located between the main body and the cover lid, and the second portion is connected to the terminal post; The second tab includes a connected third portion and a fourth portion, the third portion is located between the main body and the side wall, the fourth portion is located between the main body and the cover lid, and the fourth portion is connected to the conductive member.

8. The battery cell according to claim 1, characterized in that, The electrode assembly is a laminated structure.

9. The battery cell according to claim 1, wherein, The cover lid has a third through hole, the terminal post includes a first section and a second section, the first section is disposed on a side of the cover lid facing the receiving cavity and covers the third through hole, the diameter of the second section is smaller than that of the first section, the second section is connected to a side of the first section facing away from the receiving cavity and penetrates through the third through hole.

10. The battery cell according to claim 9, wherein, An insulating member is disposed on a side of the cover lid facing the receiving cavity, and at least a part of the insulating member is located between the first section and the cover lid.

11. The battery cell according to claim 1, characterized in that, One end of the housing in a first direction forms the first opening; The housing includes a bottom wall, in the first direction, the bottom wall is disposed opposite to the cover lid, and the bottom wall is provided with a liquid injection hole.

12. The battery cell according to claim 1, characterized in that, The first tab is a positive tab, and the second tab is a negative tab.

13. The battery cell according to claim 1, wherein The battery cell is a button battery cell.

14. An electrical device, characterized in that, Comprising the battery cell according to any one of claims 1 to 13, the battery cell being used to provide electric energy.

15. A method for preparing an electric core, characterized in that, Comprising: Providing a housing, an electrode assembly and a cover lid assembly, the cover lid assembly including a cover lid and a terminal post disposed on the cover lid, the terminal post being insulatedly connected to the cover lid; First connecting the first tab of the electrode assembly to the terminal post, then penetrating the second tab of the electrode assembly through the first through hole of the cover lid, and connecting the second tab to a conductive member; Connect the conductive part to the shell cover so that the conductive part covers the first through hole; Install the electrode assembly into the shell; Connect the shell cover to the shell.

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