Battery cell and electric equipment

Abstract

The invention provides a battery cell and electric equipment, the battery cell comprises a packaging bag, an electrode assembly and a tab, the packaging bag comprises a main body part and a first sealing part, and the first sealing part is arranged along the circumferential direction of the main body part; the electrode assembly is arranged in the main body part; one end of the tab is connected with the electrode assembly, and the other end of the tab extends out of the packaging bag from the first sealing part; the packaging bag further comprises a second sealing part, the second sealing part protrudes towards the electrode assembly from the first sealing part or the main body part, and at least part of the second sealing part makes contact with the electrode assembly. The binding effect of the packaging bag on the electrode assembly can be improved, the possibility of displacement of the electrode assembly relative to the packaging bag is reduced, so that the possibility of liquid leakage caused by packaging bag damage and tab tearing is reduced, the safety and the falling performance of the battery cell are improved, the second sealing part does not occupy the space of the battery cell additionally, and the influence on the energy density of the battery cell is small.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell and an electrical device. Background Art

[0002] With the rapid development of electronic information technology, various electronic devices are also developing towards intelligence and multi-functions, and the energy density requirements for batteries are getting higher and higher. Therefore, how to improve battery safety has become an urgent problem to be solved in the battery field. Summary of the invention

[0003] The present application provides a battery cell and an electrical device, which can improve the safety of the battery cell.

[0004] In the first aspect, the present application provides a battery cell, including a packaging bag, an electrode assembly and a tab, the packaging bag including a main body and a first sealing portion, the first sealing portion being arranged along the circumference of the main body; the electrode assembly being arranged in the main body; one end of the tab is connected to the electrode assembly, and the other end of the tab extends out of the packaging bag from the first sealing portion; wherein the packaging bag also includes a second sealing portion, the second sealing portion protruding from the first sealing portion or the main body toward the electrode assembly, and at least a portion of the second sealing portion is in contact with the electrode assembly.

[0005] In the above technical scheme, the electrode assembly is arranged in the main body of the packaging bag, so that the packaging bag can play a protective role on the electrode assembly; one end of the pole ear is connected to the electrode assembly, and the other end of the pole ear extends out of the packaging bag by the first sealing part of the packaging bag, so that the load can be electrically connected to the electrode assembly through the pole ear, thereby realizing the charging and discharging of the battery cell; the packaging bag also includes a second sealing part, the second sealing part protrudes from the first sealing part or the main body toward the electrode assembly, and at least part of the second sealing part is in contact with the electrode assembly, which can improve the restraining effect of the packaging bag on the electrode assembly and reduce the possibility of displacement of the electrode assembly relative to the packaging bag, thereby reducing the possibility of damage and leakage of the packaging bag and tearing of the pole ear, improving the safety and drop performance of the battery cell, and the second sealing part does not occupy additional space of the battery cell, and has little effect on the energy density of the battery cell.

[0006] In some embodiments of the present application, the maximum spacing distance between the second sealing portion and the electrode assembly is H, where H≤2 mm.

[0007] In the above technical solution, by making the maximum spacing distance H between the second sealing portion and the electrode assembly ≤ 2mm, the restraining effect of the packaging bag on the electrode assembly can be further improved, and the possibility of displacement of the electrode assembly relative to the packaging bag can be further reduced, thereby further reducing the possibility of damage and leakage of the packaging bag and tearing of the tabs, and further improving the safety and drop performance of the battery cell.

[0008] In some embodiments of the present application, the first sealing portion includes a top sealing portion, a first side sealing portion, and a second side sealing portion, the top sealing portion is located on one side of the main body along the first direction, the second side sealing portion and the first side sealing portion are respectively located on both sides of the main body along the second direction, the tab extends out of the packaging bag through the top sealing portion, the first side sealing portion and the second side sealing portion are respectively connected to the top sealing portion, and the first direction is perpendicular to the second direction;

[0009] The second sealing portion includes a first sub-sealing portion, and the first sub-sealing portion is protruded toward the electrode assembly from a side of the first side sealing portion and / or the second side sealing portion close to the top sealing portion; or, the first sub-sealing portion is protruded toward the electrode assembly from a side of the top sealing portion close to the first side sealing portion and / or the second side sealing portion; or, the first sub-sealing portion is protruded toward the electrode assembly by the top sealing portion, the first side sealing portion and / or the second side sealing portion together.

[0010] In the above technical solution, the first sealing part includes a top sealing part, a first side sealing part and a second side sealing part, the top sealing part is located on one side of the main body along the first direction, the second side sealing part and the first side sealing part are respectively located on both sides of the main body along the second direction, the pole ear extends out of the packaging bag through the top sealing part, the first side sealing part and the second side sealing part are respectively connected to the top sealing part, the first direction is perpendicular to the second direction, so that the first sealing part can achieve sealing on one side of the first direction and on both sides of the second direction, so that the sealing effect of the packaging bag is better, reducing the possibility of leakage of the battery cell due to sealing problems.

[0011] By making the first sub-seal portion protrude toward the electrode assembly from the first side seal portion and / or the second side seal portion on one side close to the top seal portion, the possibility of displacement of the electrode assembly relative to the packaging bag in the second direction can be reduced, thereby reducing the possibility of the electrode assembly acting on the packaging bag in the second direction and causing damage and leakage of the packaging bag, and reducing the possibility of the electrode assembly moving in the second direction and pulling the pole ear and causing the pole ear to tear or the pole ear to short-circuit with the pole piece of opposite polarity, thereby improving the safety and drop performance of the battery cell.

[0012] By arranging the first sub-seal portion to protrude from the top seal portion toward the electrode assembly near the first side seal portion and / or the second side seal portion, the possibility of displacement of the electrode assembly relative to the packaging bag in the first direction can be reduced, thereby reducing the possibility of the electrode assembly acting on the packaging bag in the first direction and causing damage and leakage of the packaging bag, and reducing the possibility of the electrode assembly moving in the first direction and pulling the pole ear and causing the pole ear to tear or the pole ear to short-circuit with the pole piece of opposite polarity, thereby improving the safety and drop performance of the battery cell.

[0013] By making the first sub-sealing portion protrude toward the electrode assembly together with the top sealing portion, the first side sealing portion and / or the second side sealing portion, the possibility of displacement of the electrode assembly relative to the packaging bag in the first direction and the second direction can be reduced, thereby reducing the possibility of the electrode assembly acting on the packaging bag in the first direction and the second direction and causing damage to the packaging bag and leakage of liquid, and reducing the possibility of the electrode assembly moving in the first direction and the second direction and pulling the pole ear and causing the pole ear to tear or the pole ear to short-circuit with the pole piece of opposite polarity, thereby improving the safety and drop performance of the battery cell.

[0014] In some embodiments of the present application, the main body portion includes a bottom portion opposite to the top seal portion along the first direction, and along the second direction, two ends of the bottom portion are respectively connected to the first side seal portion and the second side seal portion;

[0015] The second sealing portion also includes a second sub-sealing portion, which protrudes from a side of the first side sealing portion and / or the second side sealing portion close to the bottom toward the electrode assembly; or, the second sub-sealing portion protrudes from a side of the bottom close to the first side sealing portion and / or the second side sealing portion toward the electrode assembly; or, the second sub-sealing portion protrudes from the bottom, the first side sealing portion and / or the second side sealing portion toward the electrode assembly together.

[0016] In the above technical solution, by connecting the two ends of the bottom along the second direction to the first side seal portion and the second side seal portion respectively, the sealing effect of the packaging bag is improved, reducing the possibility of leakage of the battery cell due to sealing problems.

[0017] By making the second sub-sealing portion protrude toward the electrode assembly from the first side sealing portion and / or the second side sealing portion on one side near the bottom, the possibility of displacement of the electrode assembly relative to the packaging bag in the second direction can be reduced, thereby reducing the possibility of the electrode assembly acting on the packaging bag in the second direction and causing damage and leakage of the packaging bag, and reducing the possibility of the electrode assembly moving in the second direction and pulling the pole ear and causing the pole ear to tear or the pole ear to short-circuit with the pole piece of opposite polarity, thereby improving the safety and drop performance of the battery cell.

[0018] By arranging the second sub-sealing portion to protrude from the bottom close to the first side sealing portion and / or the second side sealing portion toward the electrode assembly, the possibility of displacement of the electrode assembly relative to the packaging bag in the first direction can be reduced, thereby reducing the possibility of the electrode assembly acting on the packaging bag in the first direction and causing damage and leakage of the packaging bag, and reducing the possibility of the electrode assembly moving in the first direction and pulling the pole ear and causing the pole ear to tear or the pole ear to short-circuit with the pole piece of opposite polarity, thereby improving the safety and drop performance of the battery cell.

[0019] By making the second sub-sealing portion protrude toward the electrode assembly from the bottom, the first side sealing portion and / or the second side sealing portion, the possibility of displacement of the electrode assembly relative to the packaging bag in the first direction and the second direction can be reduced, thereby reducing the possibility of the electrode assembly acting on the packaging bag in the first direction and the second direction to cause damage to the packaging bag and leakage of liquid, and reducing the possibility of the electrode assembly moving in the first direction and the second direction to pull the pole ear and cause the pole ear to tear or the pole ear to short-circuit with the pole piece of opposite polarity, thereby improving the safety and drop performance of the battery cell.

[0020] In some embodiments of the present application, the electrode assembly is rectangular when viewed along the thickness direction of the electrode assembly, and the first sub-sealing portion and / or the second sub-sealing portion are respectively located at different corners of the electrode assembly.

[0021] In the above technical scheme, by making the electrode assembly rectangular when observed along the thickness direction of the electrode assembly, the first sub-seal portion and / or the second sub-seal portion are respectively located at different corners of the electrode assembly, which can facilitate the preparation and forming of the first sub-seal portion and / or the second sub-seal portion, and in the battery cell with electrode liquid, the first sub-seal portion and / or the second sub-seal portion can make the blocking area of ​​the electrode assembly smaller along the first direction, thereby reducing the influence of the first sub-seal portion and / or the second sub-seal portion on the infiltration of the electrolyte in the battery cell.

[0022] In some embodiments of the present application, two first sub-sealing portions are provided and two second sub-sealing portions are provided; when observed along the thickness direction of the electrode assembly, the two first sub-sealing portions and the two second sub-sealing portions are respectively located at the four corners of the electrode assembly.

[0023] In the above technical solution, two first sub-sealing parts are provided and two second sub-sealing parts are provided; observed along the thickness direction of the electrode assembly, the two first sub-sealing parts and the two second sub-sealing parts are respectively located at the four corners of the electrode assembly, so that the second sealing part can constrain the electrode assembly on both sides along the first direction and on both sides along the second direction, thereby further making the second sealing part have a better restraining effect on the electrode assembly, reducing the possibility of displacement of the electrode assembly relative to the packaging bag, thereby reducing the possibility of damage and leakage of the packaging bag and tearing of the tabs, and improving the safety and drop performance of the battery cell.

[0024] In some embodiments of the present application, the first sub-sealing portion and / or the second sub-sealing portion respectively abut against their corresponding corner portions.

[0025] In the above technical solution, by making the first sub-seal and / or the second sub-seal respectively abut against their respective corresponding corners, the restraining effect of the first sub-seal and / or the second sub-seal on the electrode assembly can be further improved, reducing the possibility of displacement of the electrode assembly relative to the packaging bag, thereby reducing the possibility of damage and leakage of the packaging bag and tearing of the tabs, thereby improving the safety and drop performance of the battery cell.

[0026] In some embodiments of the present application, the first sub-sealing portion has a first side facing the corner, the second sub-sealing portion has a second side facing the corner, and the first side and / or the second side are arranged in an arc shape.

[0027] In the above technical solution, by making the first sub-seal portion have a first side facing the corner, the second sub-seal portion has a second side facing the corner, and the first side and / or the second side are arranged in an arc shape, when the first sub-seal portion and / or the second sub-seal portion contact the corner of the electrode assembly, the force of the electrode assembly acting on the first sub-seal portion and / or the second sub-seal portion can be dispersed, thereby reducing the possibility of the packaging bag being damaged or leaking due to the concentration of force of the electrode assembly, and improving the safety and drop performance of the battery cell.

[0028] In some embodiments of the present application, the fillet radius corresponding to the first side edge and the second side edge is R, and along the second direction, the spacing distance between the electrode assembly and the first side sealing portion or the second side sealing portion is d, 0.2mm≤Rd≤1mm.

[0029] In the above technical scheme, when Rd is greater than or equal to 0.2mm, it is convenient to prepare the first sub-seal and the second sub-seal, and to facilitate the assembly of the electrode assembly and the packaging bag; when Rd is less than or equal to 1mm, the first sub-seal and / or the second sub-seal can better wrap the corners of the electrode assembly, further improve the restraining effect of the packaging bag on the electrode assembly, and reduce the possibility of displacement of the electrode assembly relative to the packaging bag, thereby reducing the possibility of damage and leakage of the packaging bag and tearing of the tabs, and improving the safety and drop performance of the battery cell; therefore, when 0.2mm≤Rd≤1mm, it is convenient to prepare the first sub-seal and the second sub-seal, and to facilitate the assembly of the electrode assembly and the packaging bag, and can further improve the restraining effect of the packaging bag on the electrode assembly, reduce the possibility of displacement of the electrode assembly relative to the packaging bag, thereby reducing the possibility of damage and leakage of the packaging bag and tearing of the tabs, and improving the safety and drop performance of the battery cell.

[0030] In some embodiments of the present application, when observed along the first direction, the projection of the first sub-sealing portion at least partially overlaps with the projection of the electrode assembly, and the projection of the second sub-sealing portion at least partially overlaps with the projection of the electrode assembly; and / or, when observed along the second direction, the projection of the first sub-sealing portion at least partially overlaps with the projection of the electrode assembly, and the projection of the second sub-sealing portion at least partially overlaps with the projection of the electrode assembly.

[0031] In the above technical solution, by making the projection of the first sub-sealing portion at least partially overlap with the projection of the electrode assembly when observed along the first direction, and the projection of the second sub-sealing portion at least partially overlap with the projection of the electrode assembly, the first sub-sealing portion and the second sub-sealing portion can both restrain the electrode assembly in the first direction, thereby improving the restraining effect of the packaging bag on the electrode assembly and reducing the possibility of displacement of the electrode assembly relative to the packaging bag, thereby reducing the possibility of damage and leakage of the packaging bag and tearing of the tabs, and improving the safety and drop performance of the battery cell.

[0032] By making the projection of the first sub-sealing portion at least partially overlap with the projection of the electrode assembly when observed along the second direction, and the projection of the second sub-sealing portion at least partially overlap with the projection of the electrode assembly, the first sub-sealing portion and the second sub-sealing portion can both restrain the electrode assembly in the second direction, thereby improving the restraining effect of the packaging bag on the electrode assembly and reducing the possibility of displacement of the electrode assembly relative to the packaging bag, thereby reducing the possibility of damage and leakage of the packaging bag and tearing of the tabs, and improving the safety and drop performance of the battery cell.

[0033] In some embodiments of the present application, the first sealing portion includes a top sealing portion, which is located on one side of the main body along the first direction, and the electrode tab extends out of the packaging bag through the top sealing portion; the second sealing portion includes a third sub-sealing portion, and the third sub-sealing portion protrudes from the top sealing portion toward the electrode assembly; the electrode tab includes a positive electrode tab and a negative electrode tab, and the positive electrode tab and the negative electrode tab both extend out of the packaging bag from the top sealing portion, and the positive electrode tab and the negative electrode tab are spaced apart along the second direction, and the first direction is perpendicular to the second direction; the third sub-sealing portion is arranged between the positive electrode tab and the negative electrode tab.

[0034] In the above technical solution, by making the third sub-sealing portion protrude from the top sealing portion toward the electrode assembly, the possibility of displacement of the electrode assembly relative to the packaging bag in the first direction can be reduced, thereby reducing the possibility of the electrode assembly acting on the packaging bag in the first direction and causing damage and leakage of the packaging bag, and reducing the possibility of the electrode assembly moving in the first direction and pulling the pole ear and causing the pole ear to tear or the pole ear to short-circuit with the pole piece of opposite polarity, thereby improving the safety and drop performance of the battery cell.

[0035] In some embodiments of the present application, the maximum spacing distance between the third sub-sealing portion and the electrode assembly is H1, 0.2 mm≤H1≤2 mm.

[0036] In the above technical scheme, when H1 is greater than or equal to 0.2mm, it can facilitate the assembly of the electrode assembly and the packaging bag, and reduce the possibility of interference with the packaging bag and damage to the packaging bag during the process of loading the electrode assembly into the packaging bag; when H1 is less than or equal to 2mm, it can further improve the restraining effect of the packaging bag on the electrode assembly, further reduce the possibility of displacement of the electrode assembly relative to the packaging bag, thereby further reducing the possibility of damage and leakage of the packaging bag and tearing of the tabs, and further improving the safety and drop performance of the battery cell; therefore, when 0.2mm≤H1≤2mm, it can facilitate the assembly of the electrode assembly and the packaging bag, reduce the possibility of interference with the packaging bag and damage to the packaging bag during the process of loading the electrode assembly into the packaging bag, and further improve the restraining effect of the packaging bag on the electrode assembly, further reduce the possibility of displacement of the electrode assembly relative to the packaging bag, thereby further reducing the possibility of damage and leakage of the packaging bag and tearing of the tabs, and further improve the safety and drop performance of the battery cell.

[0037] In some embodiments of the present application, 0.2 mm ≤ H1 ≤ 0.5 mm.

[0038] In the above technical scheme, when H1 is greater than or equal to 0.2mm, it can facilitate the assembly of the electrode assembly and the packaging bag, and reduce the possibility of interference with the packaging bag and damage to the packaging bag during the process of loading the electrode assembly into the packaging bag; when H1 is less than or equal to 0.5mm, it can further improve the restraining effect of the packaging bag on the electrode assembly, further reduce the possibility of displacement of the electrode assembly relative to the packaging bag, thereby further reducing the possibility of damage and leakage of the packaging bag and tearing of the tabs, and further improving the safety and drop performance of the battery cell; therefore, when 0.2mm≤H1≤0.5mm, it can facilitate the assembly of the electrode assembly and the packaging bag, reduce the possibility of interference with the packaging bag and damage to the packaging bag during the process of loading the electrode assembly into the packaging bag, and further improve the restraining effect of the packaging bag on the electrode assembly, further reduce the possibility of displacement of the electrode assembly relative to the packaging bag, thereby further reducing the possibility of damage and leakage of the packaging bag and tearing of the tabs, and further improve the safety and drop performance of the battery cell.

[0039] In a second aspect, the present application provides an electrical device, comprising a battery cell as described above, wherein the battery cell is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can also be obtained based on these drawings.

[0041] Figure 1A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0042] Figure 2 A schematic cross-sectional view of a battery cell provided in some embodiments of the present application;

[0043] Figure 3 A schematic cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0044] Figure 4 A schematic cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0045] Figure 5 A schematic cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0046] Figure 6 A schematic cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0047] Figure 7 Schematic diagram of the cross-sectional structure of the battery cell provided in some other embodiments of the present application.

[0048] Icon: 10-battery cell; 100-packaging bag; 110-main body; 111-bottom; 120-first sealing part; 121-top sealing part; 122-first side sealing part; 123-second side sealing part; 130-second sealing part; 131-first sub-sealing part; 132-second sub-sealing part; 133-third sub-sealing part; 200-electrode assembly; 300-earth ear; 310-positive electrode ear; 320-negative electrode ear; X-first direction; Y-second direction. DETAILED DESCRIPTION

[0049] In order to make the purpose, 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 drawings in the embodiments of the present application. 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 ordinary technicians in this field belong to the scope of protection of this application.

[0050] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0051] The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0052] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0053] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0054] With the development of the new energy industry, battery cells are gradually developing in the direction of high capacity, high energy density, and high power density. However, as the capacity of the battery cell increases, the weight of the battery cell also increases. The battery cell is more likely to have relative displacement between the electrode assembly and the packaging bag during a fall or collision, which in turn causes problems such as damage to the packaging bag and tearing of the tabs, thereby causing safety risks. At present, the relative displacement of the electrode assembly and the packaging bag is reduced by adding protective glue or rigid protective parts inside or outside the battery cell, but this will increase the overall volume of the battery cell and cause a loss in the energy density of the battery cell.

[0055] In order to improve the safety of a battery cell, the present application provides a battery cell, which includes a packaging bag, an electrode assembly and a pole ear, the packaging bag includes a main body and a first sealing portion, the first sealing portion is arranged along the circumference of the main body; the electrode assembly is arranged in the main body; one end of the pole ear is connected to the electrode assembly, and the other end of the pole ear extends out of the packaging bag by the first sealing portion; wherein the packaging bag also includes a second sealing portion, the second sealing portion protrudes from the first sealing portion or the main body toward the electrode assembly, and at least part of the second sealing portion is in contact with the electrode assembly.

[0056] In a battery cell of this structure, the electrode assembly is arranged in the main body of the packaging bag, so that the packaging bag can protect the electrode assembly; one end of the pole ear is connected to the electrode assembly, and the other end of the pole ear extends out of the packaging bag through the first sealing portion of the packaging bag, so that the load can be electrically connected to the electrode assembly through the pole ear, thereby realizing the charging and discharging of the battery cell; the packaging bag also includes a second sealing portion, the second sealing portion protrudes from the first sealing portion or the main body toward the electrode assembly, and at least a portion of the second sealing portion is in contact with the electrode assembly, so that the restraining effect of the packaging bag on the electrode assembly can be improved, and the possibility of displacement of the electrode assembly relative to the packaging bag can be reduced, thereby reducing the possibility of damage and leakage of the packaging bag and tearing of the pole ear, thereby improving the safety and drop performance of the battery cell, and the second sealing portion does not occupy additional space in the battery cell, and has little effect on the energy density of the battery cell.

[0057] The battery cell provided in the embodiment of the present application can be a secondary battery or a primary battery, for example, a lithium ion battery, a sodium ion battery or a magnesium ion battery, etc., which is not limited in the embodiment of the present application. The battery cell can be cylindrical, flat, rectangular or other shapes, etc., which is not limited in the embodiment of the present application.

[0058] The embodiments of the present application provide an electrical device that uses a battery cell as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, and the like.

[0059] See also Figure 1 and Figure 2 , Figure 1 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application, Figure 2 A schematic diagram of the cross-sectional structure of a battery cell provided in some embodiments of the present application.

[0060] The embodiment of the present application provides a battery cell 10, including a packaging bag 100, an electrode assembly 200, and a tab 300. The packaging bag 100 includes a main body 110 and a first sealing portion 120, and the first sealing portion 120 is arranged along the circumference of the main body 110. The electrode assembly 200 is arranged in the main body 110. One end of the tab 300 is connected to the electrode assembly 200, and the other end of the tab 300 extends out of the packaging bag 100 from the first sealing portion 120.

[0061] By disposing the electrode assembly 200 in the main body 110 of the packaging bag 100, the packaging bag 100 can protect the electrode assembly 200. By connecting one end of the tab 300 to the electrode assembly 200, and the other end of the tab 300 extending out of the packaging bag 100 through the first sealing portion 120 of the packaging bag 100, the load can be electrically connected to the electrode assembly 200 through the tab 300, thereby realizing the charging and discharging of the battery cell 10.

[0062] The battery cell 10 also includes an electrolyte, and the packaging bag 100 is used to contain the electrode assembly 200 and the electrolyte. The electrode assembly 200 is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell 10 mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode collector. The part of the positive electrode collector that is not coated with the positive electrode active material layer serves as a positive electrode tab 310 to realize the input or output of electrical energy of the positive electrode sheet through the positive electrode tab 310. Taking a lithium-ion battery as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary material or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, and the part of the negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab 320, so as to realize the input or output of electric energy of the negative electrode sheet through the negative electrode tab 320. The material of the negative electrode current collector can be copper, and the negative electrode active material can be a carbon material or a silicon material, etc. The material of the isolation film can be polypropylene (PP) or polyethylene (PE), etc. The electrolyte can include an organic solvent, an electrolyte lithium salt, etc.

[0063] In some embodiments, the electrode assembly 200 may be a laminated structure formed by stacking a negative electrode sheet, a separator, and a positive electrode sheet.

[0064] In other embodiments, the electrode assembly 200 may also be a wound structure formed by winding a negative electrode sheet, a separator, and a positive electrode sheet.

[0065] In some embodiments, the battery cell 10 is arranged in a rectangular parallelepiped.

[0066] In some embodiments, the packaging bag 100 further includes a second sealing portion 130 , which protrudes from the first sealing portion 120 or the main body 110 toward the electrode assembly 200 , and at least a portion of the second sealing portion 130 is in contact with the electrode assembly 200 .

[0067] By making the packaging bag 100 also include a second sealing portion 130, the second sealing portion 130 is protruded from the first sealing portion 120 or the main body 110 toward the electrode assembly 200, and at least a portion of the second sealing portion 130 is in contact with the electrode assembly 200, the restraining effect of the packaging bag 100 on the electrode assembly 200 can be improved, and the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100 can be reduced, thereby reducing the possibility of damage and leakage of the packaging bag 100 and tearing of the tab 300, thereby improving the safety and drop performance of the battery cell 10, and the second sealing portion 130 does not occupy additional space in the battery cell 10, and has little impact on the energy density of the battery cell 10.

[0068] In some embodiments, the packaging bag 100 can be made of materials such as aluminum-plastic film and steel-plastic film. Taking the aluminum-plastic film as an example, the aluminum-plastic film generally includes an outer nylon layer, a middle aluminum foil layer, and an inner heat-sealing layer. Among them, the heat-sealing layer can include chlorinated polypropylene resin, polypropylene, and other materials, so that after the two layers of aluminum-plastic film cover the electrode assembly 200 in the thickness direction of the electrode assembly 200, the heat-sealing layers of the two layers of aluminum-plastic film can be integrated by hot pressing, thereby forming the first sealing portion 120 and the second sealing portion 130.

[0069] In some embodiments, the second sealing portion 130 and the first sealing portion 120 may be prepared simultaneously, and the second sealing portion 130 and the first sealing portion 120 may be integrally formed.

[0070] In other embodiments, the second sealing portion 130 may be prepared after the first sealing portion 120 is prepared, and the second sealing portion 130 and the first sealing portion 120 may also be formed integrally.

[0071] In some embodiments, the maximum spacing distance between the second sealing portion 130 and the electrode assembly 200 is H, where H≤2 mm. For example, H may be 1 mm, 1.5 mm, or 2 mm.

[0072] By ensuring that the maximum spacing distance H between the second sealing portion 130 and the electrode assembly 200 is ≤2 mm, the restraining effect of the packaging bag 100 on the electrode assembly 200 can be further improved, and the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100 can be further reduced, thereby further reducing the possibility of damage and leakage of the packaging bag 100 and tearing of the tab 300, and further improving the safety and drop performance of the battery cell 10.

[0073] In some embodiments, the first sealing portion 120 includes a top sealing portion 121, a first side sealing portion 122 and a second side sealing portion 123. The top sealing portion 121 is located on one side of the main body 110 along the first direction X, and the second side sealing portion 123 and the first side sealing portion 122 are respectively located on both sides of the main body 110 along the second direction Y. The tab 300 extends out of the packaging bag 100 through the top sealing portion 121, and the first side sealing portion 122 and the second side sealing portion 123 are respectively connected to the top sealing portion 121, and the first direction X is perpendicular to the second direction Y.

[0074] By making the first sealing portion 120 include a top sealing portion 121, a first side sealing portion 122 and a second side sealing portion 123, the top sealing portion 121 is located on one side of the main body 110 along the first direction X, the second side sealing portion 123 and the first side sealing portion 122 are respectively located on both sides of the main body 110 along the second direction Y, the pole ear 300 extends out of the packaging bag 100 through the top sealing portion 121, the first side sealing portion 122 and the second side sealing portion 123 are respectively connected to the top sealing portion 121, the first direction X is perpendicular to the second direction Y, so that the first sealing portion 120 can achieve sealing on one side of the first direction X and on both sides of the second direction Y, so that the sealing effect of the packaging bag 100 is better, and the possibility of leakage of the battery cell 10 due to sealing problems is reduced.

[0075] See also Figure 2 The second sealing portion 130 includes a first sub-sealing portion 131 , and the first sub-sealing portion 131 is protruded toward the electrode assembly 200 from a side of the first side sealing portion 122 and / or the second side sealing portion 123 close to the top sealing portion 121 .

[0076] By making the first sub-seal portion 131 protrude toward the electrode assembly 200 from the first side seal portion 122 and / or the second side seal portion 123 near the top seal portion 121, the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100 in the second direction Y can be reduced, thereby reducing the possibility that the electrode assembly 200 acts on the packaging bag 100 in the second direction Y and causes damage and leakage of the packaging bag 100, and reducing the possibility that the electrode assembly 200 moves in the second direction Y and pulls the tab 300 and causes the tab 300 to tear or the tab 300 to short-circuit with a pole piece of opposite polarity, thereby improving the safety and drop performance of the battery cell 10.

[0077] See also Figure 3 , Figure 3 Schematic diagram of the cross-sectional structure of the battery cell provided in some other embodiments of the present application.

[0078] In some embodiments, the first sub-sealing portion 131 is disposed to protrude from a side of the top sealing portion 121 close to the first side sealing portion 122 and / or the second side sealing portion 123 toward the electrode assembly 200 .

[0079] By making the first sub-sealing portion 131 protrude from the top sealing portion 121 toward the electrode assembly 200 near the first side sealing portion 122 and / or the second side sealing portion 123, the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100 in the first direction X can be reduced, thereby reducing the possibility that the electrode assembly 200 acts on the packaging bag 100 in the first direction X and causes damage and leakage of the packaging bag 100, and reducing the possibility that the electrode assembly 200 moves in the first direction X and pulls the tab 300 and causes the tab 300 to tear or the tab 300 to short-circuit with a pole piece of opposite polarity, thereby improving the safety and drop performance of the battery cell 10.

[0080] See also Figure 4 , Figure 4 Schematic diagram of the cross-sectional structure of the battery cell provided in some other embodiments of the present application.

[0081] In some embodiments, the first sub-sealing portion 131 is provided to protrude toward the electrode assembly 200 together with the top sealing portion 121 , the first side sealing portion 122 and / or the second side sealing portion 123 .

[0082] By making the first sub-sealing portion 131 protrude toward the electrode assembly 200 together with the top sealing portion 121, the first side sealing portion 122 and / or the second side sealing portion 123, the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100 in the first direction X and the second direction Y can be reduced, thereby reducing the possibility that the electrode assembly 200 acts on the packaging bag 100 in the first direction X and the second direction Y to cause damage and leakage of the packaging bag 100, and reducing the possibility that the electrode assembly 200 moves in the first direction X and the second direction Y to pull the tab 300 and cause the tab 300 to tear or the tab 300 to short-circuit with the pole piece of opposite polarity, thereby improving the safety and drop performance of the battery cell 10.

[0083] See also Figure 5 , Figure 5 Schematic diagram of the cross-sectional structure of the battery cell provided in some other embodiments of the present application.

[0084] In some embodiments, the main body 110 includes a bottom 111 opposite to the top seal portion 121 along the first direction X, and along the second direction Y, two ends of the bottom 111 are connected to the first side seal portion 122 and the second side seal portion 123 respectively.

[0085] By connecting the two ends of the bottom 111 along the second direction Y to the first side sealing portion 122 and the second side sealing portion 123 respectively, the packaging bag 100 has a better sealing effect, thereby reducing the possibility of leakage of the battery cell 10 due to sealing problems.

[0086] In some embodiments, the second sub-sealing portion 132 is provided to protrude toward the electrode assembly 200 from the bottom portion 111 , the first side sealing portion 122 and / or the second side sealing portion 123 .

[0087] By making the second sub-sealing portion 132 protrude toward the electrode assembly 200 together with the bottom 111, the first side sealing portion 122 and / or the second side sealing portion 123, the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100 in the first direction X and the second direction Y can be reduced, thereby reducing the possibility that the electrode assembly 200 acts on the packaging bag 100 in the first direction X and the second direction Y to cause damage and leakage of the packaging bag 100, and reducing the possibility that the electrode assembly 200 moves in the first direction X and the second direction Y to pull the tab 300 and cause the tab 300 to tear or the tab 300 to short-circuit with a pole piece of opposite polarity, thereby improving the safety and drop performance of the battery cell 10.

[0088] In other embodiments, the second sealing portion 130 further includes a second sub-sealing portion 132 , which is protruded from one side of the first side sealing portion 122 and / or the second side sealing portion 123 near the bottom 111 toward the electrode assembly 200 (not shown in the figure).

[0089] By making the second sub-sealing portion 132 protrude toward the electrode assembly 200 from the side of the first side sealing portion 122 and / or the second side sealing portion 123 close to the bottom 111, the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100 in the second direction Y can be reduced, thereby reducing the possibility that the electrode assembly 200 acts on the packaging bag 100 in the second direction Y and causes damage and leakage of the packaging bag 100, and reducing the possibility that the electrode assembly 200 moves in the second direction Y and pulls the tab 300 and causes the tab 300 to tear or the tab 300 to short-circuit with a pole piece of opposite polarity, thereby improving the safety and drop performance of the battery cell 10.

[0090] In other embodiments, the second sub-sealing portion 132 is disposed to protrude from a side of the bottom 111 close to the first side sealing portion 122 and / or the second side sealing portion 123 toward the electrode assembly 200 (not shown in the drawings).

[0091] By making the second sub-sealing portion 132 protrude from the bottom 111 near the first side sealing portion 122 and / or the second side sealing portion 123 toward the electrode assembly 200, the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100 in the first direction X can be reduced, thereby reducing the possibility that the electrode assembly 200 acts on the packaging bag 100 in the first direction X and causes damage and leakage of the packaging bag 100, and reducing the possibility that the electrode assembly 200 moves in the first direction X and pulls the tab 300 and causes the tab 300 to tear or the tab 300 to short-circuit with a pole piece of opposite polarity, thereby improving the safety and drop performance of the battery cell 10.

[0092] See also Figure 5In some embodiments, when viewed along the thickness direction of the electrode assembly 200 , the electrode assembly 200 is rectangular, and the first sub-sealing portion 131 and / or the second sub-sealing portion 132 are respectively located at different corners of the electrode assembly 200 .

[0093] By making the electrode assembly 200 rectangular when observed along the thickness direction of the electrode assembly 200, the first sub-sealing portion 131 and / or the second sub-sealing portion 132 are respectively located at different corners of the electrode assembly 200, which can facilitate the preparation and forming of the first sub-sealing portion 131 and / or the second sub-sealing portion 132, and in the battery cell 10 with electrode liquid, the first sub-sealing portion 131 and / or the second sub-sealing portion 132 can make the blocking area of ​​the electrode assembly 200 smaller along the first direction X, thereby reducing the influence of the first sub-sealing portion 131 and / or the second sub-sealing portion 132 on the infiltration of the electrolyte in the battery cell 10.

[0094] In some embodiments, two first sub-sealing parts 131 are provided, and two second sub-sealing parts 132 are provided. Observed along the thickness direction of the electrode assembly 200 , the two first sub-sealing parts 131 and the two second sub-sealing parts 132 are respectively located at the four corners of the electrode assembly 200 .

[0095] By providing two first sub-sealing portions 131 and two second sub-sealing portions 132; when observed along the thickness direction of the electrode assembly 200, the two first sub-sealing portions 131 and the two second sub-sealing portions 132 are respectively located at the four corners of the electrode assembly 200, so that the second sealing portion 130 can constrain the electrode assembly 200 on both sides along the first direction X and on both sides along the second direction Y, thereby further improving the restraint effect of the second sealing portion 130 on the electrode assembly 200, reducing the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100, thereby reducing the possibility of damage and leakage of the packaging bag 100 and tearing of the tab 300, thereby improving the safety and drop performance of the battery cell 10.

[0096] In some embodiments, the first sub-sealing portion 131 and / or the second sub-sealing portion 132 respectively abut against their corresponding corners.

[0097] By making the first sub-seal portion 131 and / or the second sub-seal portion 132 respectively abut against their respective corresponding corners, the restraining effect of the first sub-seal portion 131 and / or the second sub-seal portion 132 on the electrode assembly 200 can be further improved, reducing the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100, thereby reducing the possibility of damage and leakage of the packaging bag 100 and tearing of the tab 300, thereby improving the safety and drop performance of the battery cell 10.

[0098] In some embodiments, the first sub-sealing portion 131 has a first side facing the corner, the second sub-sealing portion 132 has a second side facing the corner, and the first side and / or the second side are arranged in an arc shape.

[0099] By making the first sub-seal portion 131 have a first side facing the corner, the second sub-seal portion 132 have a second side facing the corner, and the first side and / or the second side are arranged in an arc shape, when the first sub-seal portion 131 and / or the second sub-seal portion 132 contact the corner of the electrode assembly 200, the force of the electrode assembly 200 acting on the first sub-seal portion 131 and / or the second sub-seal portion 132 can be dispersed, thereby reducing the possibility of the packaging bag 100 being damaged or leaking due to the concentrated force of the electrode assembly 200, thereby improving the safety and drop performance of the battery cell 10.

[0100] In some embodiments, the fillet radius corresponding to the first side edge and the second side edge is R, and the spacing distance between the electrode assembly 200 and the first side sealing portion 122 or the second side sealing portion 123 along the second direction Y is d, 0.2 mm ≤ Rd ≤ 1 mm. For example, Rd can be 0.2 mm, 0.6 mm, or 1 mm.

[0101] When Rd is greater than or equal to 0.2 mm, it is convenient to prepare the first sub-sealing portion 131 and the second sub-sealing portion 132, and it is convenient to assemble the electrode assembly 200 and the packaging bag 100; when Rd is less than or equal to 1 mm, the first sub-sealing portion 131 and / or the second sub-sealing portion 132 can better wrap the corner of the electrode assembly 200, further improve the restraining effect of the packaging bag 100 on the electrode assembly 200, reduce the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100, thereby reducing the risk of damage and leakage of the packaging bag 100 and the possibility of the electrode assembly 200 being displaced relative to the packaging bag 100. 300 can be torn, thereby improving the safety and drop performance of the battery cell 10; therefore, when 0.2mm≤Rd≤1mm, it can not only facilitate the preparation of the first sub-sealing portion 131 and the second sub-sealing portion 132, and facilitate the assembly of the electrode assembly 200 and the packaging bag 100, but also can further improve the restraint effect of the packaging bag 100 on the electrode assembly 200, and reduce the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100, thereby reducing the possibility of damage and leakage of the packaging bag 100 and tearing of the tab 300, thereby improving the safety and drop performance of the battery cell 10.

[0102] In some embodiments, when viewed along the first direction X, a projection of the first subsealing portion 131 at least partially overlaps with a projection of the electrode assembly 200 , and a projection of the second subsealing portion 132 at least partially overlaps with a projection of the electrode assembly 200 .

[0103] By making the projection of the first sub-sealing portion 131 at least partially overlap with the projection of the electrode assembly 200 when observed along the first direction X, and the projection of the second sub-sealing portion 132 at least partially overlap with the projection of the electrode assembly 200, the first sub-sealing portion 131 and the second sub-sealing portion 132 can both restrain the electrode assembly 200 in the first direction X, thereby improving the restraining effect of the packaging bag 100 on the electrode assembly 200 and reducing the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100, thereby reducing the possibility of damage and leakage of the packaging bag 100 and tearing of the tab 300, thereby improving the safety and drop performance of the battery cell 10.

[0104] In some embodiments, when viewed along the second direction Y, a projection of the first subsealing portion 131 at least partially overlaps with a projection of the electrode assembly 200 , and a projection of the second subsealing portion 132 at least partially overlaps with a projection of the electrode assembly 200 .

[0105] By making the projection of the first sub-sealing portion 131 at least partially overlap with the projection of the electrode assembly 200 when observed along the second direction Y, and the projection of the second sub-sealing portion 132 at least partially overlap with the projection of the electrode assembly 200, both the first sub-sealing portion 131 and the second sub-sealing portion 132 can restrain the electrode assembly 200 in the second direction Y, thereby improving the restraining effect of the packaging bag 100 on the electrode assembly 200 and reducing the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100, thereby reducing the possibility of damage and leakage of the packaging bag 100 and tearing of the tab 300, thereby improving the safety and drop performance of the battery cell 10.

[0106] See also Figure 6 , Figure 6 Schematic diagram of the cross-sectional structure of the battery cell provided in some other embodiments of the present application.

[0107] In some embodiments, the first sealing portion 120 includes a top seal portion 121, the top seal portion 121 is located on one side of the main body 110 along the first direction X, and the tab 300 extends out of the packaging bag 100 through the top seal portion 121. The tab 300 includes a positive tab 310 and a negative tab 320, both of which extend out of the packaging bag 100 from the top seal portion 121, and the positive tab 310 and the negative tab 320 are spaced apart along the second direction Y, and the first direction X is perpendicular to the second direction Y.

[0108] In some embodiments, the second sealing portion 130 includes a third sub-sealing portion 133 , and the third sub-sealing portion 133 is protruded from the top sealing portion 121 toward the electrode assembly 200 . The third sub-sealing portion 133 is disposed between the positive electrode tab 310 and the negative electrode tab 320 .

[0109] By making the third sub-sealing portion 133 protrude from the top sealing portion 121 toward the electrode assembly 200, the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100 in the first direction X can be reduced, thereby reducing the possibility that the electrode assembly 200 acts on the packaging bag 100 in the first direction X and causes damage and leakage of the packaging bag 100, and reducing the possibility that the electrode assembly 200 moves in the first direction X and pulls the tab 300 and causes the tab 300 to tear or the tab 300 to short-circuit with a pole piece of opposite polarity, thereby improving the safety and drop performance of the battery cell 10.

[0110] In some embodiments, the maximum spacing distance between the third sub-sealing portion 133 and the electrode assembly 200 is H1, 0.2 mm≤H1≤2 mm. For example, H1 may be 0.2 mm, 1.2 mm, or 2 mm.

[0111] When H1 is greater than or equal to 0.2 mm, it is easy to assemble the electrode assembly 200 and the packaging bag 100, and the possibility of interference with the packaging bag 100 and damage to the packaging bag 100 during the process of the electrode assembly 200 being loaded into the packaging bag 100 is reduced; when H1 is less than or equal to 2 mm, the binding effect of the packaging bag 100 on the electrode assembly 200 can be further improved, and the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100 can be further reduced, thereby further reducing the possibility of damage and leakage of the packaging bag 100 and the tearing of the tab 300, and further improving the safety and drop resistance of the battery cell 10. drop performance; therefore, when 0.2mm≤H1≤2mm, it can not only facilitate the assembly of the electrode assembly 200 and the packaging bag 100, and reduce the possibility of interference with the packaging bag 100 and damage to the packaging bag 100 during the process of the electrode assembly 200 being loaded into the packaging bag 100, but also further improve the restraining effect of the packaging bag 100 on the electrode assembly 200, and further reduce the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100, thereby further reducing the possibility of damage and leakage of the packaging bag 100 and tearing of the tab 300, and further improve the safety and drop performance of the battery cell 10.

[0112] In some embodiments, 0.2 mm ≤ H1 ≤ 0.5 mm. For example, H1 may be 0.2 mm, 0.3 mm, or 0.5 mm.

[0113] When H1 is greater than or equal to 0.2 mm, it is easy to assemble the electrode assembly 200 and the packaging bag 100, and the possibility of interference with the packaging bag 100 and damage to the packaging bag 100 during the process of the electrode assembly 200 being loaded into the packaging bag 100 is reduced; when H1 is less than or equal to 0.5 mm, the binding effect of the packaging bag 100 on the electrode assembly 200 can be further improved, and the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100 can be further reduced, thereby further reducing the possibility of damage and leakage of the packaging bag 100 and the tearing of the tab 300, and further improving the safety and drop resistance of the battery cell 10. drop performance; therefore, when 0.2mm≤H1≤0.5mm, it can not only facilitate the assembly of the electrode assembly 200 and the packaging bag 100, and reduce the possibility of interference with the packaging bag 100 and damage to the packaging bag 100 during the process of the electrode assembly 200 being loaded into the packaging bag 100, but also further improve the restraining effect of the packaging bag 100 on the electrode assembly 200, and further reduce the possibility of displacement of the electrode assembly 200 relative to the packaging bag 100, thereby further reducing the possibility of damage and leakage of the packaging bag 100 and tearing of the tab 300, and further improve the safety and drop performance of the battery cell 10.

[0114] See also Figure 7 , Figure 7 Schematic diagram of the cross-sectional structure of the battery cell provided in some other embodiments of the present application.

[0115] In some embodiments, the second sealing portion 130 includes a first sub-sealing portion 131, a second sub-sealing portion 132, and a third sub-sealing portion 133. The first sub-sealing portion 131 is protruded toward the electrode assembly 200 by the top sealing portion 121, the first side sealing portion 122, and / or the second side sealing portion 123. The second sub-sealing portion 132 is protruded toward the electrode assembly 200 by the bottom 111, the first side sealing portion 122, and / or the second side sealing portion 123. The third sub-sealing portion 133 is protruded toward the electrode assembly 200 by the top sealing portion 121. The third sub-sealing portion 133 is disposed between the positive electrode tab 310 and the negative electrode tab 320.

[0116] The possibility of displacement of the electrode assembly 200 relative to the packaging bag 100 in the first direction X and the second direction Y can be further reduced, thereby reducing the possibility that the electrode assembly 200 acts on the packaging bag 100 in the first direction X and the second direction Y and causes damage and leakage of the packaging bag 100, and reducing the possibility that the electrode assembly 200 moves in the first direction X and the second direction Y and pulls the tab 300 and causes the tab 300 to tear or the tab 300 to short-circuit with a pole piece of opposite polarity, thereby improving the safety and drop performance of the battery cell 10.

[0117] An embodiment of the present application provides an electrical device, comprising a battery cell 10 according to any of the above solutions, and the battery cell 10 is used to provide electrical energy to the electrical device.

[0118] The electrical device may be any of the aforementioned devices or systems using the battery cell 10 .

[0119] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0120] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. 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: include: A packaging bag comprises a main body and a first sealing portion, wherein the first sealing portion is arranged along the circumference of the main body; An electrode assembly is disposed in the main body; a pole tab, one end of which is connected to the electrode assembly, and the other end of which extends out of the packaging bag through the first sealing portion; The packaging bag further includes a second sealing portion, which is protruded from the first sealing portion or the main body toward the electrode assembly, and at least a portion of the second sealing portion is in contact with the electrode assembly.

2. The battery cell according to claim 1, characterized in that: The maximum spacing distance between the second sealing portion and the electrode assembly is H, where H≤2 mm.

3. The battery cell according to claim 1, characterized in that: The first sealing portion comprises a top sealing portion, a first side sealing portion and a second side sealing portion, the top sealing portion is located at one side of the main body along the first direction, the second side sealing portion and the first side sealing portion are respectively located at two sides of the main body along the second direction, the tab extends out of the packaging bag through the top sealing portion, the first side sealing portion and the second side sealing portion are respectively connected to the top sealing portion, and the first direction is perpendicular to the second direction; The second sealing portion includes a first sub-sealing portion, and the first sub-sealing portion is protruded toward the electrode assembly from a side of the first side sealing portion and / or the second side sealing portion close to the top sealing portion; or, the first sub-sealing portion is protruded toward the electrode assembly from a side of the top sealing portion close to the first side sealing portion and / or the second side sealing portion; or, the first sub-sealing portion is protruded toward the electrode assembly by the top sealing portion, the first side sealing portion and / or the second side sealing portion together.

4. The battery cell according to claim 3, characterized in that: The main body comprises a bottom portion opposite to the top sealing portion along a first direction, and two ends of the bottom portion are connected to the first side sealing portion and the second side sealing portion respectively along the second direction; The second sealing portion also includes a second sub-sealing portion, which protrudes from the first side sealing portion and / or the second side sealing portion near the bottom toward the electrode assembly; or, the second sub-sealing portion protrudes from the bottom near the first side sealing portion and / or the second side sealing portion toward the electrode assembly; or, the second sub-sealing portion protrudes from the bottom, the first side sealing portion and / or the second side sealing portion toward the electrode assembly together.

5. The battery cell according to claim 4, characterized in that: When viewed along the thickness direction of the electrode assembly, the electrode assembly is rectangular, and the first sub-sealing portion and / or the second sub-sealing portion are respectively located at different corners of the electrode assembly.

6. The battery cell according to claim 5, characterized in that: The first sub-sealing parts are provided with two, and the second sub-sealing parts are provided with two; When viewed along the thickness direction of the electrode assembly, the two first sub-sealing portions and the two second sub-sealing portions are respectively located at four corners of the electrode assembly.

7. The battery cell according to claim 5, characterized in that: The first sub-sealing portion and / or the second sub-sealing portion are respectively in contact with the corresponding corner portions.

8. The battery cell according to claim 5, characterized in that: The first sub-sealing portion has a first side facing the corner, the second sub-sealing portion has a second side facing the corner, and the first side and / or the second side are arranged in an arc shape.

9. The battery cell according to claim 8, characterized in that: The fillet radius corresponding to the first side edge and the second side edge is R, and along the second direction, the spacing distance between the electrode assembly and the first side sealing portion or the second side sealing portion is d, 0.2mm≤Rd≤1mm.

10. The battery cell according to claim 4, characterized in that: When viewed along the first direction, a projection of the first sub-sealing portion at least partially overlaps with a projection of the electrode assembly, and a projection of the second sub-sealing portion at least partially overlaps with a projection of the electrode assembly; and / or, When viewed along the second direction, a projection of the first subsealing portion at least partially overlaps with a projection of the electrode assembly, and a projection of the second subsealing portion at least partially overlaps with a projection of the electrode assembly.

11. The battery cell according to any one of claims 1 to 4, characterized in that: The first sealing portion comprises a top sealing portion, the top sealing portion is located at one side of the main body along the first direction, and the tab extends out of the packaging bag through the top sealing portion; The second sealing portion includes a third sub-sealing portion, and the third sub-sealing portion is protruded from the top sealing portion toward the electrode assembly; The electrode tabs include a positive electrode tab and a negative electrode tab, the positive electrode tab and the negative electrode tab both extend out of the packaging bag from the top seal portion, the positive electrode tab and the negative electrode tab are spaced apart along a second direction, and the first direction is perpendicular to the second direction; The third sub-sealing portion is disposed between the positive electrode tab and the negative electrode tab.

12. The battery cell according to claim 11, characterized in that: Along the first direction, the maximum spacing distance between the third sub-sealing portion and the electrode assembly is H1, 0.2 mm≤H1≤2 mm.

13. The battery cell according to claim 11, characterized in that: 0.2mm≤H1≤0.5mm.

14. An electrical device, characterized in that: The invention comprises a battery cell as described in any one of claims 1 to 13, wherein the battery cell is used to provide electrical energy.

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