Battery cell and electric equipment

Abstract

The invention provides a battery cell and electric equipment, the battery cell comprises a packaging bag and an electrode assembly, the packaging bag comprises a main body part and a first sealing part, the first main body part and the second main body part of the main body part are arranged and connected along a first direction, the first main body part has a first surface in the thickness direction of the battery cell, and the second main body part has a second surface in the thickness direction of the battery cell. The second main body part protrudes out of the first surface; the first sealing part is connected to the side, away from the second main body part, of the first main body part, a first part of the first sealing part extends from a second part of the first sealing part to be arranged on the first surface, and the second part is connected with the first main body part. The influence of the first sealing part on the overall thickness of the battery cell is small, the influence on the overall width of the battery cell in the first direction is small, and the improvement of the energy density of the battery cell is facilitated; and when the battery cell is clamped along the thickness direction, the thickness of the packaging bag covered by the first surface is relatively large, so that the possibility that the first main body part is damaged due to stress can be reduced, and the safety of the battery cell is improved.

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 new energy technologies, batteries have been widely used in electronic equipment, electric vehicles, electric two-wheelers, power tools, etc. The requirements for battery quality, safety, and miniaturization are becoming increasingly higher.

[0003] For soft-pack batteries with a step shape, the batteries have at least two thicknesses. The sealing part of the battery on the thicker side can be folded normally, but on the thinner side, if the sealing part of the battery is folded, it will exceed the main part of the battery and increase the overall thickness of the battery; if it is not folded, the overall width of the battery will increase, both of which will cause a large loss of battery energy density. Summary of the invention

[0004] The present application provides a battery cell and an electrical device, which can improve the energy density of the battery cell.

[0005] In a first aspect, the present application provides a battery cell, the battery cell comprising a packaging bag and an electrode assembly, the packaging bag comprising a main body and a first sealing portion, and the electrode assembly is accommodated in the main body. The main body comprises a first main body and a second main body, the first main body and the second main body are arranged and connected along a first direction, and the first main body has a first surface in the thickness direction of the battery cell. Along the thickness direction of the battery cell, the second main body protrudes from the first surface, and the first direction is perpendicular to the thickness direction of the battery cell. The first sealing portion is connected to a side of the first main body away from the second main body. The first sealing portion comprises a first part and a second part. The first part is extended from the second part and arranged on the first surface, and the second part is connected to the first main body.

[0006] In the above technical solution, the electrode assembly is housed in the main body so that the main body can protect the electrode assembly; the main body includes a first main body and a second main body, the first main body and the second main body are arranged and connected along a first direction, the first main body has a first surface in the thickness direction of the battery cell, and the second main body protrudes from the first surface along the thickness direction of the battery cell, and the first direction is perpendicular to the thickness direction of the battery cell, so that a step structure is formed between the first main body and the second main body, which can be used to accommodate other components when the battery cell is assembled in an electrical device; the first sealing part is connected to a side of the first main body away from the second main body, the first sealing part includes a first part and a second part, the first part is formed by the second part The second part is extended on the first surface, and is connected to the first main body. The first part can be at least partially accommodated between the first main body and the second main body in the thickness direction, and the first part does not exceed the second main body or the thickness of the part exceeding the second main body is smaller, so that the first sealing part has less influence on the overall thickness of the battery cell, and the width of the first sealing part exceeding the first main body in the first direction is smaller, so that the first sealing part has less influence on the overall width of the battery cell along the first direction, which is beneficial to improve the energy density of the battery cell; when the battery cell is clamped along its thickness direction, the thickness of the packaging bag covered by the first surface is larger, which can reduce the possibility of the first main body being damaged by force, thereby improving the safety of the battery cell.

[0007] In some embodiments of the present application, along the thickness direction of the battery cell, the thickness of the first main body portion is H1, and the thickness of the second main body portion is H2, satisfying H1<H2.

[0008] In the above technical solution, by making the thickness H1 of the first main body and the thickness H2 of the second main body satisfy H1<H2 along the thickness direction of the battery cell, a step structure can be formed between the first main body and the second main body, which can be used to accommodate other components when the battery cell is assembled in the electrical equipment and adapt to different electrical equipment.

[0009] In some embodiments of the present application, 0.1 mm≤H2-H1≤5 mm.

[0010] In the above technical scheme, when H2-H1 is greater than or equal to 0.1mm, the depth of the step structure formed between the first main body and the second main body is larger, which can be used to accommodate components of various sizes, so that the battery cell can be adapted to more types of electrical equipment; when H2-H1 is less than or equal to 5mm, the space utilization rate of the battery cell can be higher, and thus the energy density of the battery cell can be higher; therefore, when 0.1mm≤H2-H1≤5mm, the battery cell can be used to accommodate components of various sizes, so that the battery cell can be adapted to more types of electrical equipment, and the space utilization rate of the battery cell can be higher, and the energy density of the battery cell can be higher.

[0011] In some embodiments of the present application, 0.5 mm ≤ H1 ≤ 5 mm, 1.5 mm ≤ H2 ≤ 10 mm.

[0012] In the above technical solution, when H1 is greater than or equal to 0.5 mm, the space in the first main body portion for accommodating the electrode assembly is larger, which is beneficial to improving the energy density of the battery cell; when H1 is less than or equal to 5 mm, the thickness of the battery cell is smaller, and it can be applied to more types of electrical equipment; therefore, when 0.5 mm ≤ H1 ≤ 5 mm, it can not only help improve the energy density of the battery cell, but also make the battery cell adaptable to more types of electrical equipment.

[0013] When H2 is greater than or equal to 1.5mm, the space in the second main body for accommodating the electrode assembly is larger, which is beneficial to improving the energy density of the battery cell; when H2 is less than or equal to 10mm, the overall thickness of the battery cell is smaller, and it can be applied to more types of electrical equipment; therefore, when 1.5mm≤H2≤10mm, it can not only help improve the energy density of the battery cell, but also make the battery cell applicable to more types of electrical equipment.

[0014] In some embodiments of the present application, the second main body has a second surface in the thickness direction of the battery cell, a step is formed between the second surface and the first surface, and the first portion does not protrude from the second surface along the thickness direction of the battery cell.

[0015] In the above technical solution, the second main body has a second surface in the thickness direction of the battery cell, a step is formed between the second surface and the first surface, and the first part does not protrude from the second surface along the thickness direction of the battery cell, so that the first sealing part does not increase the overall thickness of the battery cell, which is beneficial to improving the energy density of the battery cell.

[0016] In some embodiments of the present application, a thickness direction of the second portion is parallel to the first direction.

[0017] In the above technical solution, by making the thickness direction of the second part parallel to the first direction, the space occupied by the second part in the first direction can be smaller, thereby making the overall width of the battery cell in the first direction smaller, which is beneficial to improving the energy density of the battery cell.

[0018] In some embodiments of the present application, along the first direction, the width of the first main body is W1, the width of the first part is W2, the distance from the surface of the second part facing away from the first main body to the surface of the first main body facing the second part is D1; ​​the thickness of the first main body is H1, and the thickness of the second main body is H2; W2≤W1+D1+(H2-H1).

[0019] In the above technical solution, by ensuring that W2≤W1+D1+(H2-H1), the first part can be prevented from extending to the second surface of the second main body, and the first part does not exceed the second main body in the thickness direction of the battery cell, so that the first sealing part does not increase the overall thickness of the battery cell, which is beneficial to improving the energy density of the battery cell; the first part has a larger coverage area of ​​the first main body, and further ensures that when the battery cell is clamped, the first surface of the first main body is not directly subjected to force, which can reduce the possibility of damage to the first main body due to force, thereby improving the safety of the battery cell; since the hardness of the first sealing part is generally greater than the hardness of the electrode sheet of the electrode assembly, during the formation stage of the battery cell, the force transmitted to the electrode assembly by the clamp through the first part is more uniform, which can improve the interface effect of the formation electrode sheet.

[0020] In some embodiments of the present application, W2≤W1+D1.

[0021] In the above technical solution, by making W2≤W1+D1, the first part can be prevented from extending to the second main body, thereby reducing the possibility of interference between the first part and the second main body, and facilitating the first part to fit the first surface of the first main body.

[0022] In some embodiments of the present application, an adhesive layer is provided between the first portion and the first main body.

[0023] In the above technical solution, by providing an adhesive layer between the first part and the first main body, the first part and the first main body can be better fitted together, reducing the possibility of warping of the first sealing part, thereby reducing the possibility of interference between the first sealing part and other components.

[0024] In some embodiments of the present application, the first surface includes a first area and a second area, and along the first direction, the first area is located between the second area and the second main body; along the thickness direction of the battery cell, the second main body protrudes from the first area, and the first area protrudes from the second area; the first part includes a first section and a second section, the first section is arranged in the first area, the second section is arranged in the second area, and the second section connects the first section and the second part.

[0025] In the above technical solution, by making the first surface include the first area and the second area, along the first direction, the first area is located between the second area and the second main body; along the thickness direction of the battery cell, the second main body protrudes from the first area, and the first area protrudes from the second area, so that a step structure is formed between the second main body and the first area, and a step structure is formed between the first area and the second area, which can be used to accommodate other components when the battery cell is assembled in an electrical device; by making the first part include the first section and the second section, the first section is arranged in the first area, the second section is arranged in the second area, and the second section connects the first section and the second section, so that the first section does not exceed the first section. The thickness of the second main body portion or the portion that exceeds the second main body portion is smaller, and the thickness of the second section that does not exceed the first area or the portion that exceeds the first area is smaller, so that the first sealing portion has less influence on the overall thickness of the battery cell, and the length of the first sealing portion exceeding the first main body portion in the first direction is smaller, so that the first sealing portion has less influence on the overall width of the battery cell along the first direction, which is beneficial to improving the energy density of the battery cell; when the battery cell is clamped along its thickness direction, the thickness of the packaging bag covered by the first area is larger, and the thickness of the packaging bag covered by the second area is larger, which can reduce the possibility of damage to the first area and the second area due to force, thereby improving the safety of the battery cell.

[0026] In some embodiments of the present application, the packaging bag includes a second sealing portion, which is connected to a side of the second main body portion away from the first main body portion; the second sealing portion includes a third part and a fourth part, and the third part and the fourth part are stacked along the first direction, the third part is located between the fourth part and the second main body portion, and the fourth part connects the third part and the second main body portion.

[0027] In the above technical solution, the packaging bag includes a second sealing portion, the second sealing portion is connected to the side of the second main body portion away from the first main body portion; the second sealing portion includes a third part and a fourth part, and the third part and the fourth part are stacked along the first direction, the third part is located between the fourth part and the second main body portion, and the fourth part connects the third part and the second main body portion. This allows the second sealing portion to occupy a smaller space in the first direction, thereby making the overall width of the battery cell in the first direction smaller, which is beneficial to improving the energy density of the battery cell.

[0028] In some embodiments of the present application, along the first direction, the distance from the surface of the second part facing away from the first main body to the surface of the first main body facing the second part is D1, and the distance from the surface of the fourth part facing away from the second main body to the surface of the second main body facing the fourth part is D2, satisfying D1≤D2.

[0029] In the above technical solution, by making the distance D1 from the surface of the second part facing away from the first main body to the surface of the first main body facing the second part and the distance D2 from the surface of the fourth part facing away from the second main body to the surface of the second main body facing the fourth part satisfy D1≤D2 along the first direction, the width of the first sealing part exceeding the main body in the first direction is smaller than the width of the second sealing part exceeding the main body in the first direction, so that the first sealing part has a smaller influence on the overall width of the battery cell along the first direction than the second sealing part, which is beneficial to improve the energy density of the battery cell.

[0030] In some embodiments of the present application, along the thickness direction of the battery cell, the thickness of the second main body portion is H2, and the height of the second sealing portion is H3, satisfying H3≤H2.

[0031] In the above technical solution, by making the thickness H2 of the second main body and the height H3 of the second sealing part satisfy H3≤H2 along the thickness direction of the battery cell, the second sealing part does not exceed the second main body in the thickness direction of the battery cell, so that the second sealing part does not increase the overall thickness of the battery cell, which is beneficial to improving the energy density of the battery cell.

[0032] In some embodiments of the present application, the main body portion also includes a third main body portion, which is connected to a side of the second main body portion away from the first main body portion along the first direction, and the third main body portion has a third surface in the thickness direction of the battery cell, and the second main body portion protrudes from the third surface; the packaging bag includes a third sealing portion, and the third sealing portion is connected to a side of the third main body portion away from the second main body portion; the third sealing portion includes a fifth part and a sixth part, the fifth part is arranged on the third surface, and the sixth part connects the fifth part and the third main body portion.

[0033] In the above technical solution, the main body also includes a third main body, along the first direction, the third main body is connected to the side of the second main body away from the first main body, the third main body has a third surface in the thickness direction of the battery cell, the second main body protrudes from the third surface, so that a step structure is formed between the second main body and the third main body, which can be used to accommodate other components when the battery cell is assembled on the electrical equipment; the packaging bag includes a third sealing part, the third sealing part is connected to the side of the third main body away from the second main body; the third sealing part includes a fifth part and a sixth part, the fifth part is arranged on the third surface, and the sixth part connects the fifth part and the third main body, so that the thickness of the part of the fifth part that does not exceed the second main body or exceeds the second main body is small, so that the third sealing part has a small influence on the overall thickness of the battery cell, and the width of the third sealing part exceeding the third main body in the first direction is small, so that the third sealing part has a small influence on the overall width of the battery cell along the first direction, which is beneficial to improve the energy density of the battery cell; when the battery cell is clamped along its thickness direction, the thickness of the packaging bag covered by the third surface is large, which can reduce the possibility of the third main body being damaged by force, thereby improving the safety of the battery cell.

[0034] 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

[0035] 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.

[0036] Figure 1 A schematic structural diagram of a battery cell from one perspective provided in some embodiments of the present application;

[0037] Figure 2 A schematic structural diagram of a battery cell from another perspective provided in some embodiments of the present application;

[0038] Figure 3 for Figure 2 A schematic diagram of a local enlarged structure of the battery cell shown;

[0039] Figure 4 A schematic structural diagram of a battery cell from one perspective provided in some other embodiments of the present application;

[0040] Figure 5 A schematic structural diagram of a battery cell from another perspective provided in some other embodiments of the present application;

[0041] Figure 6 for Figure 2 A schematic diagram of a partial enlarged structure of a cell at position B shown;

[0042] Figure 7 A schematic structural diagram of a battery cell from one perspective provided in some other embodiments of the present application;

[0043] Figure 8 A schematic structural diagram of a battery cell from another perspective provided in some other embodiments of the present application;

[0044] Fig. 9 A schematic structural diagram of a battery cell from one perspective provided in some other embodiments of the present application.

[0045] Icon: 10-battery cell; 100-packaging bag; 110-main body; 111-first main body; 1111-first surface; 1112-first area; 1113-second area; 1114-fourth surface; 112-second main body; 1121-second surface; 1122-fifth surface; 113-third main body; 120-first sealing part; 121-first part; 1211-first section; 1212-second section; 122-second part; 130-second sealing part; 131-third part; 132-fourth part; 140-third sealing part; 141-fifth part; 142-sixth part; 210-first electrical connector; 220-second electrical connector; X-first direction; Y-thickness direction of battery cell; Z-second direction. DETAILED DESCRIPTION

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] With the development of the new energy industry, batteries are gradually developing towards high energy density, high power density and multi-function. In some electrical equipment, it is necessary to adapt to special-shaped battery cells. For example, electrical equipment with folding screens needs to adapt to battery cells with stepped surfaces so that components such as circuit boards can be set at the stepped parts of the battery cells.

[0052] In a soft-pack battery cell, the packaging bag of the battery cell generally has a main body and a sealing part. The sealing part is bent relative to the main body, which can reduce the space occupied by the battery cell and improve the energy density of the battery cell. In order to achieve a better sealing effect of the sealing part, the width of the sealing part is larger, and in order to improve the energy density of the battery cell, the height of the sealing part after bending does not exceed the thickness of the main body. For soft-pack batteries with a step shape, the battery cell has at least two thicknesses. The sealing part of the battery cell on the side with a larger thickness can be folded normally, and the sealing part after folding does not exceed the main body. However, on the side with a smaller thickness, if the sealing part of the battery cell is folded, it will exceed the main body of the battery cell, increase the overall thickness of the battery cell, and cause a large loss in the energy density of the battery cell; if it is not folded, the overall length or width of the battery cell will increase, which will also cause a large loss in the energy density of the battery cell.

[0053] In order to improve the energy density of a battery cell, the present application provides a battery cell, which includes a packaging bag and an electrode assembly, the packaging bag includes a main body and a first sealing part, and the electrode assembly is accommodated in the main body; the main body includes a first main body and a second main body, the first main body and the second main body are arranged and connected along a first direction, the first main body has a first surface in the thickness direction of the battery cell, and the second main body protrudes from the first surface along the thickness direction of the battery cell, and the first direction is perpendicular to the thickness direction of the battery cell; the first sealing part is connected to a side of the first main body away from the second main body, the first sealing part includes a first part and a second part, the first part is extended from the second part and is arranged on the first surface, and the second part is connected to the first main body.

[0054] In a battery cell shell of this structure, the electrode assembly is accommodated in the main body so that the main body can play a protective role on the electrode assembly; the main body includes a first main body and a second main body, the first main body and the second main body are arranged and connected along a first direction, the first main body has a first surface in the thickness direction of the battery cell, the second main body protrudes from the first surface along the thickness direction of the battery cell, the first direction is perpendicular to the thickness direction of the battery cell, so that a step structure is formed between the first main body and the second main body, which can be used to accommodate other components when the battery cell is assembled in an electrical device; the first sealing part is connected to a side of the first main body away from the second main body, the first sealing part includes a first part and a second part, the first part is formed by the second The first part is extended on the first surface, and the second part is connected to the first main body, so that the first part can be at least partially accommodated between the first main body and the second main body in the thickness direction, and the first part does not exceed the second main body or the thickness of the part exceeding the second main body is smaller, so that the first sealing part has less influence on the overall thickness of the battery cell, and the width of the first sealing part exceeding the first main body in the first direction is smaller, so that the first sealing part has less influence on the overall width of the battery cell along the first direction, which is beneficial to improve the energy density of the battery cell; when the battery cell is clamped along its thickness direction, the thickness of the packaging bag covered by the first surface is larger, which can reduce the possibility of the first main body being damaged by force, thereby improving the safety of the battery cell.

[0055] 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 electrochemical device can be cylindrical, flat, rectangular or other shapes, etc., which is not limited in the embodiment of the present application.

[0056] 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.

[0057] See also Figures 1 to 3 , Figure 1 A schematic diagram of the structure of a battery cell from one perspective provided in some embodiments of the present application, Figure 2 This is a schematic diagram of the structure of a battery cell from another perspective provided in some embodiments of the present application. Figure 3 for Figure 2 A schematic diagram of the local enlarged structure of the battery cell shown.

[0058] The embodiment of the present application provides a battery cell 10 , which includes a packaging bag 100 and an electrode assembly (not shown in the figure). The packaging bag 100 includes a main body 110 , and the electrode assembly is accommodated in the main body 110 .

[0059] By accommodating the electrode assembly in the main body 110 , the main body 110 can protect the electrode assembly.

[0060] The battery cell 10 includes a packaging bag 100, an electrode assembly and an electrolyte, and the packaging bag 100 is used to contain the electrode assembly and the electrolyte. The electrode assembly 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 is used as a positive electrode ear to realize the input or output of electric energy of the positive electrode sheet through the positive electrode ear. The positive electrode ear and the positive electrode collector can also be set separately and then connected as one, for example, the positive electrode ear and the positive electrode collector are connected as one by welding connection, conductive glue connection, etc. Taking lithium-ion batteries 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. The negative electrode plate 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. The portion of the negative electrode current collector that is not coated with the negative electrode active material layer serves as a negative electrode ear, so as to realize the input or output of electric energy of the negative electrode plate through the negative electrode ear. The negative electrode ear and the negative electrode current collector can also be separately arranged and then connected as one, for example, the negative electrode ear and the negative electrode current collector are connected as one by welding connection, conductive adhesive connection, etc. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon material or silicon material, etc. The material of the isolation membrane can be polypropylene (PP) or polyethylene (PE), etc. The electrolyte can include an organic solvent, an electrolyte lithium salt, etc.

[0061] In some embodiments, the electrode assembly can be a stacked electrode assembly, in which at least one positive electrode sheet, at least one negative electrode sheet and at least one isolation membrane are stacked in a certain order, and the isolation membrane is arranged between the positive electrode sheet and the negative electrode sheet to insulate and separate the positive electrode sheet and the negative electrode sheet, thereby reducing the risk of short circuit of the battery cell 10.

[0062] In some embodiments, the electrode assembly may also be a wound electrode assembly. The positive electrode sheet, the negative electrode sheet and the separator are stacked in a certain order and wound around a winding center axis to form a wound electrode assembly. The separator is arranged between the positive electrode sheet and the negative electrode sheet, and the separator is used to insulate and separate the positive electrode sheet and the negative electrode sheet.

[0063] In some embodiments, the packaging bag 100 may be made of an aluminum-plastic film.

[0064] The main body 110 includes a first main body 111 and a second main body 112. The first main body 111 and the second main body 112 are arranged and connected along a first direction X. The first main body 111 has a first surface 1111 in the thickness direction Y of the battery cell. Along the thickness direction Y of the battery cell, the second main body 112 protrudes from the first surface 1111. The first direction X is perpendicular to the thickness direction Y of the battery cell.

[0065] The main body 110 includes a first main body 111 and a second main body 112, the first main body 111 and the second main body 112 are arranged and connected along a first direction X, the first main body 111 has a first surface 1111 in a thickness direction Y of the battery cell, the second main body 112 protrudes from the first surface 1111 along the thickness direction Y of the battery cell, and the first direction X is perpendicular to the thickness direction Y of the battery cell, so that a step structure is formed between the first main body 111 and the second main body 112, which can be used to accommodate other components when the battery cell 10 is assembled in an electrical device.

[0066] The packaging bag 100 includes a first sealing portion 120, which is connected to a side of the first main body 111 away from the second main body 112. The first sealing portion 120 includes a first part 121 and a second part 122. The first part 121 is extended from the second part 122 and is arranged on the first surface 1111. The second part 122 is connected to the first main body 111.

[0067] By connecting the first sealing portion 120 to the side of the first main body 111 away from the second main body 112, the first sealing portion 120 includes a first portion 121 and a second portion 122, the first portion 121 is extended from the second portion 122 and arranged on the first surface 1111, and the second portion 122 is connected to the first main body 111, so that the first portion 121 can be at least partially accommodated between the first main body 111 and the second main body 112 in the thickness direction, and the first portion 121 can not exceed the second main body 112 or exceed the second main body 112. The thickness of the first sealing portion 120 is small, so that the first sealing portion 120 has a small effect on the overall thickness of the battery cell 10, and the width of the first sealing portion 120 exceeding the first main body 111 in the first direction X is small, so that the first sealing portion 120 has a small effect on the overall width of the battery cell 10 along the first direction X, which is beneficial to improving the energy density of the battery cell 10; when the battery cell 10 is clamped along its thickness direction, the thickness of the packaging bag 100 covered by the first surface 1111 is large, which can reduce the possibility of the first main body 111 being damaged by force, thereby improving the safety of the battery cell 10.

[0068] In some embodiments, along the thickness direction Y of the battery cell, the thickness of the first body portion 111 is H1, and the thickness of the second body portion 112 is H2, satisfying H1<H2. For example, H1 may be 0.9*H2, 0.7*H2, or 0.5*H2.

[0069] By ensuring that the thickness H1 of the first main body 111 and the thickness H2 of the second main body 112 satisfy H1<H2 along the thickness direction Y of the battery cell, a step structure can be formed between the first main body 111 and the second main body 112, which can be used to accommodate other components when the battery cell 10 is assembled in an electrical device, thereby adapting to different electrical devices.

[0070] In some embodiments, the first body portion 111 has a fourth surface 1114 opposite to the first surface 1111 along the thickness direction Y of the battery cell, and the thickness of the first body portion 111 is the distance between the first surface 1111 and the fourth surface 1114 along the thickness direction Y of the battery cell.

[0071] In some embodiments, the second body portion 112 has a second surface 1121 and a fifth surface 1122 opposite to each other along the thickness direction Y of the battery cell, and the thickness of the second body portion 112 is the distance between the second surface 1121 and the fifth surface 1122 along the thickness direction Y of the battery cell.

[0072] In some embodiments, 0.1 mm ≤ H2 - H1 ≤ 5 mm. For example, H2 - H1 may be 0.1 mm, 2 mm, or 5 mm.

[0073] When H2-H1 is greater than or equal to 0.1mm, the depth of the step structure formed between the first main body 111 and the second main body 112 is greater, which can be used to accommodate components of various sizes, so that the battery cell 10 can be adapted to more types of electrical equipment; when H2-H1 is less than or equal to 5mm, the space utilization rate of the battery cell 10 can be higher, and thus the energy density of the battery cell 10 is higher; therefore, when 0.1mm≤H2-H1≤5mm, the battery cell 10 can be used to accommodate components of various sizes, so that the battery cell 10 can be adapted to more types of electrical equipment, and the space utilization rate of the battery cell 10 can be higher, and the energy density of the battery cell 10 can be higher.

[0074] In some embodiments, 0.5 mm ≤ H1 ≤ 5 mm. For example, H1 may be 0.5 mm, 3 mm, or 5 mm.

[0075] When H1 is greater than or equal to 0.5mm, the first main body 111 has a larger space for accommodating the electrode assembly, which is beneficial to improving the energy density of the battery cell 10; when H1 is less than or equal to 5mm, the thickness of the battery cell 10 is smaller and can be applied to more types of electrical equipment; therefore, when 0.5mm≤H1≤5mm, it can not only help improve the energy density of the battery cell 10, but also make the battery cell 10 adaptable to more types of electrical equipment.

[0076] In some embodiments, 1.5 mm ≤ H2 ≤ 10 mm. For example, H2 may be 1.5 mm, 5 mm, or 10 mm.

[0077] When H2 is greater than or equal to 1.5mm, the second main body 112 has a larger space for accommodating the electrode assembly, which is beneficial to improving the energy density of the battery cell 10; when H2 is less than or equal to 10mm, the overall thickness of the battery cell 10 is smaller and can be applied to more types of electrical equipment; therefore, when 1.5mm≤H2≤10mm, it can not only help improve the energy density of the battery cell 10, but also make the battery cell 10 applicable to more types of electrical equipment.

[0078] In some embodiments, the second body portion 112 has a second surface 1121 in the thickness direction Y of the battery cell, a step is formed between the second surface 1121 and the first surface 1111 , and along the thickness direction Y of the battery cell, the first portion 121 does not protrude from the second surface 1121 .

[0079] By making the second main body 112 have a second surface 1121 in the thickness direction Y of the battery cell, a step is formed between the second surface 1121 and the first surface 1111. Along the thickness direction Y of the battery cell, the first part 121 does not protrude from the second surface 1121, so that the first sealing part 120 does not increase the overall thickness of the battery cell 10, which is beneficial to improving the energy density of the battery cell 10.

[0080] In some embodiments, the first main body 111 has a fourth surface 1114 opposite to the first surface 1111 along the thickness direction Y of the battery cell, the second main body 112 has a fifth surface 1122 opposite to the second surface 1121 along the thickness direction Y of the battery cell, and the fourth surface 1114 is flush with the fifth surface 1122 .

[0081] By making the fourth surface 1114 flush with the fifth surface 1122 , the battery cell 10 forms a step structure only on one side in the thickness direction thereof, so as to be adapted to electrical equipment.

[0082] In other embodiments, along the thickness direction Y of the battery core, the fifth surface 1122 protrudes from the fourth surface 1114, and can be adapted to different electrical devices.

[0083] In other embodiments, the fourth surface 1114 protrudes from the fifth surface 1122 and can be adapted to different electrical devices.

[0084] In some embodiments, a thickness direction of the second portion 122 is parallel to the first direction X.

[0085] By making the thickness direction of the second portion 122 parallel to the first direction X, the space occupied by the second portion 122 in the first direction X can be smaller, thereby making the overall width of the battery cell 10 in the first direction X smaller, which is beneficial to improving the energy density of the battery cell 10.

[0086] In some embodiments, the second portion 122 and the first main body portion 111 are spaced apart from each other along the side surface in the first direction X, and a rounded corner is formed at the connection between the first portion 121 and the second portion 122, and a rounded corner is formed at the connection between the second portion 122 and the first main body portion 111, so that the outer surface of the battery cell 10 can be more regular.

[0087] In other embodiments, the thickness direction of the second portion 122 is inclined relative to the first direction X, so that the first portion 121 can better fit the first main body portion 111 .

[0088] For example Figure 3 As shown, the first surface 1111 of the first main body 111 is rounded on one side away from the second main body 112. In other embodiments, the first portion 121 can be arranged to fit the rounded corner. The second portion 122 can also be arranged to fit the first main body 111, which can make the space occupied by the battery cell 10 smaller and the energy density of the battery cell 10 higher.

[0089] In some embodiments, along the first direction X, the width of the first main body 111 is W1, the width of the first portion 121 is W2, the distance from the surface of the second portion 122 facing away from the first main body 111 to the surface of the first main body 111 facing the second portion 122 is D1; ​​the thickness of the first main body 111 is H1, and the thickness of the second main body 112 is H2; W2≤W1+D1+(H2-H1). For example, W2 can be W1+D1+(H2-H1), W1+D1, or W1, etc.

[0090] By ensuring that W2≤W1+D1+(H2-H1), the first portion 121 can be prevented from extending to the second surface 1121 of the second main body 112, and the first portion 121 does not exceed the second main body 112 in the thickness direction Y of the battery cell, so that the first sealing portion 120 does not increase the overall thickness of the battery cell 10, which is beneficial to improving the energy density of the battery cell 10; the first portion 121 has a larger coverage area of ​​the first main body 111, and further ensures that when the battery cell 10 is clamped, the first surface 1111 of the first main body 111 is not directly subjected to force, which can reduce the possibility of damage to the first main body 111, thereby improving the safety of the battery cell 10; since the hardness of the first sealing portion 120 is generally greater than the hardness of the electrode sheet of the electrode assembly, during the formation stage of the battery cell 10, the force transmitted to the electrode assembly by the clamp through the first portion 121 is more uniform, which can improve the interface effect of the formation electrode sheet.

[0091] In some embodiments, the width of the first body portion 111 is the distance along the first direction X from the connection between the first body portion 111 and the second body portion 112 to the surface of the first body portion 111 facing the second portion 122 .

[0092] In some embodiments, the width of the first portion 121 is the distance along the first direction X from the connection between the first portion 121 and the second portion 122 (the surface of the second portion 122 facing away from the first body portion 111 ) to the end surface of the first portion 121 away from the second portion 122 .

[0093] In some embodiments, W2≤W1+D1. For example, W2 may be W1+D1, W1, or 0.9*W1.

[0094] By ensuring that W2≤W1+D1, the first portion 121 does not extend to the second body portion 112 , thereby reducing the possibility of interference between the first portion 121 and the second body portion 112 and facilitating the first portion 121 to fit the first surface 1111 of the first body portion 111 .

[0095] In some embodiments, the first portion 121 extends to a connection between the first body portion 111 and the second body portion 112 .

[0096] By extending the first portion 121 to the connection between the first main body portion 111 and the second main body portion 112, the first portion 121 can cover the first surface of the first main body portion 111, thereby protecting the first main body portion 111, and the first portion 121 covers a larger area of ​​the first main body portion 111, further ensuring that when the battery cell 10 is clamped, the first surface 1111 of the first main body portion 111 is not directly subjected to force, thereby reducing the possibility of damage to the first main body portion 111, thereby improving the safety of the battery cell 10; since the hardness of the first sealing portion 120 is generally greater than the hardness of the electrode sheet of the electrode assembly, during the formation stage of the battery cell 10, the force transmitted to the electrode assembly by the clamp through the first portion 121 is more uniform, which can further improve the interface effect of the formation electrode sheet.

[0097] In some embodiments, an adhesive layer (not shown) is disposed between the first portion 121 and the first body portion 111 .

[0098] By providing an adhesive layer between the first portion 121 and the first main body portion 111 , the first portion 121 and the first main body portion 111 can be better fitted together, and the possibility of warping of the first sealing portion 120 can be reduced, thereby reducing the possibility of interference between the first sealing portion 120 and other components.

[0099] In some embodiments, along the thickness direction Y of the battery core, the projection of the adhesive layer partially overlaps with the projection of the first part 121, which can facilitate the bonding of the first part 121 to the first main body 111. For example, the adhesive layer is arranged along the circumference of the first part 121, which can reduce the possibility of warping of the first part 121. For example, the adhesive layer is arranged in the middle of the first part 121, which can make the bonding strength between the first part 121 and the first main body 111 higher, and the first part 121 is not easy to separate from the first main body 111.

[0100] In some embodiments, along the thickness direction Y of the battery cell, the projection of the adhesive layer overlaps with the projection of the first part 121, which can make the bonding strength between the first part 121 and the first main body 111 higher, the first part 121 is not easy to separate from the first main body 111, and the possibility of warping of the first part 121 can be reduced.

[0101] In some embodiments, the adhesive layer may include at least one of ethylene, propylene, vinylidene fluoride, acrylic acid, acrylic ester, styrene, acrylonitrile, maleic anhydride, vinyl chloride, and allyl chloride.

[0102] See also Figure 4 and Figure 5 , Figure 4 A schematic structural diagram of a battery cell from one perspective provided in some other embodiments of the present application; Figure 5A schematic structural diagram of a battery cell from another perspective provided in some other embodiments of the present application.

[0103] In some embodiments, the first surface 1111 includes a first area 1112 and a second area 1113. Along the first direction X, the first area 1112 is located between the second area 1113 and the second main body 112. Along the thickness direction Y of the battery cell, the second main body 112 protrudes from the first area 1112, and the first area 1112 protrudes from the second area 1113. The first portion 121 includes a first section 1211 and a second section 1212. The first section 1211 is disposed in the first area 1112, the second section 1212 is disposed in the second area 1113, and the second section 1212 connects the first section 1211 and the second portion 122.

[0104] By making the first surface 1111 include the first area 1112 and the second area 1113, along the first direction X, the first area 1112 is located between the second area 1113 and the second main body 112; along the thickness direction Y of the battery cell, the second main body 112 protrudes from the first area 1112, and the first area 1112 protrudes from the second area 1113, so that a step structure is formed between the second main body 112 and the first area 1112, and a step structure is formed between the first area 1112 and the second area 1113, which can be used to accommodate other components when the battery cell 10 is assembled in an electrical device. By making the first part 121 include a first section 1211 and a second section 1212, the first section 1211 is arranged in the first area 1112, the second section 1212 is arranged in the second area 1113, and the second section 1212 connects the first section 1211 and the second part 122, the thickness of the first section 1211 that does not exceed the second main body 112 or exceeds the second main body 112 can be reduced, and the thickness of the second section 1212 that does not exceed the first area 1112 or exceeds the first area 1112 can be reduced, so that the first sealing part 120 has a smaller influence on the overall thickness of the battery cell 10, and the length of the first sealing part 120 exceeding the first main body 111 in the first direction X is smaller, so that the first sealing part 120 has a smaller influence on the overall width of the battery cell 10 along the first direction X, which is beneficial to improve the energy density of the battery cell 10. When the battery cell 10 is clamped along its thickness direction, the thickness of the packaging bag 100 covered by the first area 1112 is larger, and the thickness of the packaging bag 100 covered by the second area 1113 is larger, which can reduce the possibility of the first area 1112 and the second area 1113 being damaged by force, thereby improving the safety of the battery cell 10.

[0105] In some other embodiments, the first surface 1111 may also include more than two regions to form a multi-step structure on the first surface 1111, which can be applicable to different electrical devices.

[0106] See also Figure 6 , Figure 6 for Figure 2 A schematic diagram of the local enlarged structure of the battery cell at B is shown.

[0107] In some embodiments, the packaging bag 100 includes a second sealing portion 130, which is connected to a side of the second main body portion 112 away from the first main body portion 111; the second sealing portion 130 includes a third portion 131 and a fourth portion 132, and along the first direction X, the third portion 131 and the fourth portion 132 are stacked, the third portion 131 is located between the fourth portion 132 and the second main body portion 112, and the fourth portion 132 connects the third portion 131 and the second main body portion 112.

[0108] The packaging bag 100 includes a second sealing portion 130, and the second sealing portion 130 is connected to the side of the second main body portion 112 away from the first main body portion 111; the second sealing portion 130 includes a third portion 131 and a fourth portion 132, and the third portion 131 and the fourth portion 132 are stacked along the first direction X, the third portion 131 is located between the fourth portion 132 and the second main body portion 112, and the fourth portion 132 connects the third portion 131 and the second main body portion 112, so that the space occupied by the second sealing portion 130 in the first direction X is smaller, thereby making the overall width of the battery cell 10 in the first direction X smaller, which is beneficial to improving the energy density of the battery cell 10.

[0109] See also Figure 3 and Figure 6 In some embodiments, along the first direction X, the distance from the surface of the second portion 122 facing away from the first main body 111 to the surface of the first main body 111 facing the second portion 122 is D1, and the distance from the surface of the fourth portion 132 facing away from the second main body 112 to the surface of the second main body 112 facing the fourth portion 132 is D2, satisfying D1≤D2. For example, D1 can be D2, 0.9*D2, or 0.7*D2, etc.

[0110] By ensuring that along the first direction X, the distance D1 from the surface of the second part 122 facing away from the first main body 111 to the surface of the first main body 111 facing the second part 122, and the distance D2 from the surface of the fourth part 132 facing away from the second main body 112 to the surface of the second main body 112 facing the fourth part 132 satisfy D1≤D2, the width of the portion of the first sealing portion 120 that extends beyond the main body 110 in the first direction X is smaller than the width of the portion of the second sealing portion 130 that extends beyond the main body 110 in the first direction X, so that the first sealing portion 120 has a smaller influence on the overall width of the battery cell 10 along the first direction X than the second sealing portion 130, which is beneficial to improving the energy density of the battery cell 10.

[0111] In some embodiments, along the thickness direction Y of the battery cell, the thickness of the second main body 112 is H2, and the height of the second sealing portion 130 is H3, satisfying H3≤H2. For example, H3 can be H2, 0.9*H2, or 0.7*H2.

[0112] By ensuring that the thickness H2 of the second main body 112 and the height H3 of the second sealing portion 130 along the thickness direction Y of the battery cell satisfy H3≤H2, the second sealing portion 130 does not exceed the second main body 112 in the thickness direction Y of the battery cell, so that the second sealing portion 130 does not increase the overall thickness of the battery cell 10, which is beneficial to improving the energy density of the battery cell 10.

[0113] See also Figure 7 and Figure 8 , Figure 7 A schematic diagram of the structure of a battery cell from one perspective provided in some other embodiments of the present application, Figure 8 A schematic structural diagram of a battery cell from another perspective provided in some other embodiments of the present application.

[0114] In other embodiments, the main body 110 further includes a third main body 113, which is connected to the side of the second main body 112 away from the first main body 111 along the first direction X, and the third main body 113 has a third surface in the thickness direction Y of the battery cell, and the second main body 112 protrudes from the third surface. The packaging bag 100 includes a third sealing portion 140, which is connected to the side of the third main body 113 away from the second main body 112. The third sealing portion 140 includes a fifth portion 141 and a sixth portion 142, the fifth portion 141 is arranged on the third surface, and the sixth portion 142 connects the fifth portion 141 and the third main body 113.

[0115] By making the main body 110 also include a third main body 113, along the first direction X, the third main body 113 is connected to the side of the second main body 112 away from the first main body 111, the third main body 113 has a third surface 1131 in the thickness direction Y of the battery cell, and the second main body 112 protrudes from the third surface 1131, so that a step structure is formed between the second main body 112 and the third main body 113, which can be used to accommodate other components when the battery cell 10 is assembled in an electrical device. By making the packaging bag 100 include the third sealing part 140, the third sealing part 140 is connected to the side of the third main body 113 away from the second main body 112; the third sealing part 140 includes the fifth part 141 and the sixth part 142, the fifth part 141 is arranged on the third surface 1131, and the sixth part 142 connects the fifth part 141 and the third main body 113, so that the thickness of the fifth part 141 that does not exceed the second main body 112 or exceeds the second main body 112 is small, so that the third sealing part 140 has a small effect on the overall thickness of the battery cell 10, and the width of the third sealing part 140 exceeding the third main body 113 in the first direction X is small, so that the third sealing part 140 has a small effect on the overall width of the battery cell 10 along the first direction X, which is conducive to improving the energy density of the battery cell 10. When the battery cell 10 is clamped along its thickness direction, the thickness of the packaging bag 100 covered by the third surface 1131 is large, which can reduce the possibility of the third main body 113 being damaged by force, thereby improving the safety of the battery cell 10.

[0116] See also Figure 1 In some embodiments, the battery cell 10 includes a first electrical connector 210 and a second electrical connector 220, the first electrical connector 210 is connected to the positive electrode tab of the electrode assembly, the second electrical connector 220 is connected to the negative electrode tab of the electrode assembly, and extends out of the packaging bag 100 along the second direction Z.

[0117] In some embodiments, the first direction X, the thickness direction Y of the battery cell, and the second direction Z are perpendicular to each other.

[0118] In some embodiments, the first electrical connector 210 and the positive electrode tab may be connected by welding, and the second electrical connector 220 and the negative electrode tab may be connected by welding.

[0119] In other embodiments, the first electrical connector 210 and the positive electrode tab may be integrally formed, and the second electrical connector 220 and the negative electrode tab may be integrally formed.

[0120] In some embodiments, the first electrical connector 210 and the second electrical connector 220 may be made of a material with good electrical conductivity, such as a metal material such as lead or copper.

[0121] See also Fig. 9 , Fig. 9 A schematic structural diagram of a battery cell from one perspective provided in some other embodiments of the present application.

[0122] In other embodiments, the battery cell 10 includes a first electrical connector 210 and a second electrical connector 220, the first electrical connector 210 is connected to the positive electrode tab of the electrode assembly, the second electrical connector 220 is connected to the negative electrode tab of the electrode assembly, and extends out of the packaging bag 100 along the first direction X.

[0123] Along the first direction X, the first electrical connector 210 and the second electrical connector 220 are located on the same side of the electrode assembly, and the first electrical connector 210 and the first sealing portion 120 are located on opposite sides of the electrode assembly.

[0124] 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.

[0125] The electrical device may be any of the aforementioned devices or systems using the battery cell 10 .

[0126] 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.

[0127] 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: The packaging bag comprises a packaging bag and an electrode assembly, wherein the packaging bag comprises a main body and a first sealing part, and the electrode assembly is accommodated in the main body; The main body portion includes a first main body portion and a second main body portion, the first main body portion and the second main body portion are arranged and connected along a first direction, the first main body portion has a first surface in the thickness direction of the battery core, and the second main body portion protrudes from the first surface along the thickness direction of the battery core, and the first direction is perpendicular to the thickness direction of the battery core; The first sealing portion is connected to a side of the first main body away from the second main body, and the first sealing portion includes a first portion and a second portion, the first portion is extended from the second portion and arranged on the first surface, and the second portion is connected to the first main body.

2. The battery cell according to claim 1, characterized in that: Along the thickness direction of the battery core, the thickness of the first main body portion is H1, and the thickness of the second main body portion is H2, satisfying H1<H2.

3. The battery cell according to claim 2, characterized in that: 0.1mm≤H2-H1≤5mm.

4. The battery cell according to claim 2, characterized in that: 0.5mm≤H1≤5mm, 1.5mm≤H2≤10mm.

5. The battery cell according to claim 1, characterized in that: The second main body has a second surface in the thickness direction of the battery core, a step is formed between the second surface and the first surface, and the first portion does not protrude from the second surface along the thickness direction of the battery core.

6. The battery cell according to claim 1, characterized in that: A thickness direction of the second portion is parallel to the first direction.

7. The battery cell according to claim 1, characterized in that: Along the first direction, the width of the first main body is W1, the width of the first part is W2, the distance from the surface of the second part facing away from the first main body to the surface of the first main body facing the second part is D1; ​​the thickness of the first main body is H1, and the thickness of the second main body is H2; W2≤W1+D1+(H2-H1).

8. The battery cell according to claim 7, characterized in that: W2≤W1+D1.

9. The battery cell according to claim 1, characterized in that: An adhesive layer is disposed between the first portion and the first main body.

10. The battery cell according to claim 1, characterized in that: The first surface includes a first area and a second area, and along the first direction, the first area is located between the second area and the second main body; Along the thickness direction of the battery core, the second main body protrudes from the first area, and the first area protrudes from the second area; The first part includes a first section and a second section, the first section is disposed in the first area, the second section is disposed in the second area, and the second section connects the first section and the second part.

11. The battery cell according to any one of claims 1 to 10, characterized in that: The packaging bag comprises a second sealing portion, wherein the second sealing portion is connected to a side of the second main body portion away from the first main body portion; The second sealing portion includes a third portion and a fourth portion, the third portion and the fourth portion are stacked along the first direction, the third portion is located between the fourth portion and the second main body portion, and the fourth portion connects the third portion and the second main body portion.

12. The battery cell according to claim 11, characterized in that: Along the first direction, the distance from the surface of the second part facing away from the first main body to the surface of the first main body facing the second part is D1, and the distance from the surface of the fourth part facing away from the second main body to the surface of the second main body facing the fourth part is D2, satisfying D1≤D2.

13. The battery cell according to claim 11, characterized in that: Along the thickness direction of the battery core, the thickness of the second main body portion is H2, and the height of the second sealing portion is H3, satisfying H3≤H2.

14. The battery cell according to any one of claims 1 to 10, characterized in that: The main body portion further includes a third main body portion, which is connected to a side of the second main body portion away from the first main body portion along the first direction, and has a third surface in the thickness direction of the battery core, and the second main body portion protrudes from the third surface; The packaging bag comprises a third sealing portion, wherein the third sealing portion is connected to a side of the third main body portion away from the second main body portion; The third sealing portion includes a fifth portion and a sixth portion, the fifth portion is disposed on the third surface, and the sixth portion connects the fifth portion and the third main body portion.

15. An electrical equipment, characterized in that: The battery cell comprises a battery cell as claimed in any one of claims 1 to 14, wherein the battery cell is used to provide electrical energy.

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