Battery cell and electric device

Abstract

The present application provides a battery cell and an electric device. The battery cell comprises a casing and an electrode assembly; the electrode assembly is accommodated in the casing; the casing comprises a first wall and a second wall arranged opposite to each other in the thickness direction of the battery cell; the first wall comprises a first sub-wall, a second sub-wall, and a first connecting wall; in a direction away from the second wall, the second sub-wall protrudes from the first sub-wall, and the first connecting wall connects the first sub-wall to the second sub-wall; in the thickness direction of the battery cell, the distance between the first sub-wall and the second sub-wall is H1, wherein 0 mm<H1≤1.5 mm; and the included angle between the first connecting wall and the thickness direction of the battery cell is θ1, wherein 0°<θ1≤45°. In this way, the casing can be better attached to the electrode assembly, so that the gap between the first connecting wall and the electrode assembly is smaller, thereby improving the energy density of the battery cell. Moreover, the electrode assembly does not easily shake in the casing, so that the stability of the battery cell is better.

Description

Battery cell and electric device Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application CN202411321134.3, filed on September 20, 2024, entitled "Battery cell and electric device", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery cell and an electric device. BACKGROUND

[0003] With the rapid development of new energy technology, batteries have been widely used in electronic devices, electric vehicles, electric two-wheel vehicles, electric tools and other fields. The quality, safety and miniaturization of batteries are also increasingly demanding.

[0004] For soft-pack batteries with a stepped shape, the packaging film is generally punched to form a stepped shape. However, for some packaging films, especially those with a small step depth, it is difficult to form a punch. After the packaging film is prepared to form a shell, the shell and the electrode assembly have poor adhesion, a large gap is formed between the step of the shell and the electrode assembly, resulting in a loss of energy density of the battery, and the electrode assembly is easily shaken in the shell, resulting in poor stability of the battery. SUMMARY

[0005] The present application provides a battery cell and an electric device, which can improve the energy density and stability of the battery cell.

[0006] In a first aspect, the present application provides a battery cell, which includes a shell and an electrode assembly. The electrode assembly is accommodated in the shell. The shell includes a first wall and a second wall arranged opposite along the thickness direction of the battery cell. The first wall includes a first sub-wall, a second sub-wall, and a first connecting wall. The second sub-wall protrudes from the first sub-wall in a direction away from the second wall, and the first connecting wall connects the first sub-wall and the second sub-wall. The distance between the first sub-wall and the second sub-wall along the thickness direction of the battery cell is H1, which satisfies 0mm < H1 ≤ 1.5mm. The angle between the first connecting wall and the thickness direction of the battery cell is θ1, which satisfies 0° < θ1 ≤ 45°.

[0007] In the technical solution, the electrode assembly is accommodated in the shell, so that the shell can protect the electrode assembly; the shell includes the first wall and the second wall arranged opposite along the thickness direction of the battery cell, the first wall includes the first sub-wall, the second sub-wall and the first connecting wall, the second sub-wall protrudes from the first sub-wall along the direction away from the second wall, the first connecting wall connects the first sub-wall and the second sub-wall, so that a step structure is formed between the first sub-wall and the second sub-wall, which can accommodate other components when the battery cell is assembled in the electrical equipment; the distance H1 between the first sub-wall and the second sub-wall along the thickness direction of the battery cell satisfies 0mm < H1 ≤ 1.5mm. When the punch depth of the packaging film is greater than 1.5mm, a smaller included angle between the first connecting wall and the thickness direction of the battery cell can be formed directly by the punch, so that the shell and the electrode assembly have better fitting. When the punch depth of the packaging film is less than or equal to 1.5mm, it is difficult to form a smaller included angle between the first connecting wall and the thickness direction of the battery cell, so that the shell and the electrode assembly have poor fitting. When θ1 is greater than 0°, the electrode assembly can be easily assembled into the shell, and the possibility of extrusion damage of the electrode assembly and the shell during installation is reduced; when θ1 is less than or equal to 45°, the battery cell can be applied to the case where the step depth is less than or equal to 1.5mm, and in the case where the step depth is less than or equal to 1.5mm, the included angle θ1 between the first connecting wall and the thickness direction of the battery cell is smaller, so that the shell and the electrode assembly have better fitting, the gap between the first connecting wall and the electrode assembly is smaller, which is beneficial to improve the energy density of the battery cell, and the electrode assembly is not easy to shake in the shell, so that the stability of the battery cell is better. Therefore, when 0° < θ1 ≤ 45°, the electrode assembly can be easily assembled into the shell, the possibility of extrusion damage of the electrode assembly and the shell during installation is reduced, the shell and the electrode assembly have better fitting, the gap between the first connecting wall and the electrode assembly is smaller, which is beneficial to improve the energy density of the battery cell, and the electrode assembly is not easy to shake in the shell, so that the stability of the battery cell is better.

[0008] In some embodiments of the present application, 0mm < H1 ≤ 1mm, 20° ≤ θ1 ≤ 45°.

[0009] In the technical scheme, when θ1 is greater than or equal to 20°, the electrode assembly can be conveniently installed into the shell, and the possibility of extrusion damage of the electrode assembly and the shell during installation can be reduced; when θ1 is less than or equal to 45°, the battery cell can be further applied to the case where the step depth is less than or equal to 1 mm, the application range of the battery cell is wider, and in the case where the step depth is less than or equal to 1 mm, the angle θ1 between the first connecting wall and the thickness direction of the battery cell is smaller, the fit between the shell and the electrode assembly is better, the gap between the first connecting wall and the electrode assembly is smaller, the energy density of the battery cell can be further improved, the electrode assembly is not prone to shaking in the shell, and the stability of the battery cell is further better; therefore, when 0 mm < H1 ≤ 1 mm and 20° ≤ θ1 ≤ 45°, the electrode assembly can be conveniently installed into the shell, the possibility of extrusion damage of the electrode assembly and the shell during installation can be reduced, the fit between the shell and the electrode assembly is better, the gap between the first connecting wall and the electrode assembly is smaller, the energy density of the battery cell can be further improved, the electrode assembly is not prone to shaking in the shell, and the stability of the battery cell is further better.

[0010] In some embodiments of the present application, the electrode assembly includes a first tab group and a second tab group, the first tab group and the second tab group are stacked, and the size of the first tab group along the first direction is greater than the size of the second tab group along the first direction; the first tab group is located between the first sub-wall and the second wall, and the second tab group is located between the first tab group and the second sub-wall; the first direction is perpendicular to the thickness direction of the battery cell.

[0011] In the technical scheme, by making the electrode assembly include the first tab group and the second tab group, the first tab group and the second tab group are stacked, and the size of the first tab group along the first direction is greater than the size of the second tab group along the first direction, the first tab group and the second tab group can jointly form a step structure to adapt to the step structure of the shell; the first tab group is located between the first sub-wall and the second wall, and the second tab group is located between the first tab group and the second sub-wall, so that the second tab group is accommodated at the step structure of the shell to adapt to the first wall and the second wall of the shell.

[0012] In some embodiments of the present application, the first sub-wall has a first end close to the first connecting wall, the second tab group includes a second positive tab and a second negative tab stacked, and along the first direction, the distance between one end of the second negative tab close to the first connecting wall and the first end is D, which satisfies D ≤ 1.5 mm.

[0013] In the technical solution, the first sub-wall has a first end close to the first connecting wall, the second pole piece group includes the second positive pole piece and the second negative pole piece arranged in layers, and the distance D between the one end of the second negative pole piece close to the first connecting wall and the first end in the first direction satisfies D≤1.5 mm, so that the gap between the first connecting wall and the electrode assembly in the first direction is small, the energy density of the battery cell is improved, the electrode assembly is not prone to shaking in the shell, and the stability of the battery cell is good.

[0014] In some embodiments of the present application, the distance between the first sub-wall and the second wall in the thickness direction of the battery cell is T1, the distance between the second sub-wall and the second wall is T2, and T1

[0015] In the technical solution, the distance T1 between the first sub-wall and the second wall and the distance T2 between the second sub-wall and the second wall in the thickness direction of the battery cell satisfy T1

[0016] In some embodiments of the present application, one end of the first connecting wall is connected with the first sub-wall through a first circular arc transition part, and the other end of the first connecting wall is connected with the second sub-wall through a second circular arc transition part.

[0017] In the technical solution, one end of the first connecting wall is connected with the first sub-wall through a first circular arc transition part, and the other end of the first connecting wall is connected with the second sub-wall through a second circular arc transition part, so that the first wall is convenient to prepare and shape, the force distribution of the first circular arc transition part and the second circular arc transition part is more uniform when stressed, stress concentration is not prone to occur, the possibility of damage of the first connecting wall due to stress is reduced, and other components are not prone to be damaged.

[0018] In some embodiments of the present application, the first wall further includes a third sub-wall and a second connecting wall, the third sub-wall is located on the side of the second sub-wall away from the first sub-wall, the second sub-wall protrudes from the third sub-wall in the direction away from the second wall, the second connecting wall connects the second sub-wall and the third sub-wall, the distance between the second sub-wall and the third sub-wall in the thickness direction of the battery cell is H2, and 0mm

[0019] In the technical solution, the first wall further comprises a third sub-wall and a second connecting wall, the third sub-wall is located on the side of the second sub-wall away from the first sub-wall, the second sub-wall protrudes from the third sub-wall in the direction away from the second wall, and the second connecting wall connects the second sub-wall and the third sub-wall, so that a step structure is formed between the second sub-wall and the third sub-wall, which can accommodate other components when the battery cell is assembled in the electrical equipment; the distance between the second sub-wall and the third sub-wall in the thickness direction of the battery cell is H2, which satisfies 0mm<H2≤1.5mm; when θ2 is greater than 0°, the electrode assembly can be easily assembled into the shell, and the possibility of damage to the electrode assembly and the shell during installation is reduced; when θ2≤45°, the battery cell can be applied to the case where the step depth is less than or equal to 1.5mm, and in the case where the step depth is less than or equal to 1.5mm, the angle θ2 between the second connecting wall and the thickness direction of the battery cell is small, which can make the shell and the electrode assembly fit better, the gap between the second connecting wall and the electrode assembly is small, which is beneficial to improve the energy density of the battery cell, and the electrode assembly is not easy to shake in the shell, so that the stability of the battery cell is good; therefore, when 0°<θ2≤45°, the electrode assembly can be easily assembled into the shell, the possibility of damage to the electrode assembly and the shell during installation is reduced, the shell and the electrode assembly fit better, the gap between the second connecting wall and the electrode assembly is smaller, which is beneficial to improve the energy density of the battery cell, and the electrode assembly is not easy to shake in the shell, so that the stability of the battery cell is good.

[0020] In some embodiments of the present application, an insulating layer is arranged between the first wall and the electrode assembly, and the insulating layer covers at least the inner surface of the first connecting wall.

[0021] In the technical solution, an insulating layer is arranged between the first wall and the electrode assembly, and the insulating layer covers at least the inner surface of the first connecting wall, so that the insulating layer can play an insulating role between the shell and the electrode assembly, and also play a protective role for the shell, which can reduce the possibility of damage to the first connecting wall by the electrode assembly.

[0022] In a second aspect, the present application provides an electrical equipment comprising the battery cell as described above, which is used to provide electrical energy.

[0023] In a third aspect, the present application provides a preparation method of a battery cell, comprising:

[0024] The application provides a battery cell, which comprises a shell and an electrode assembly accommodated in the shell; the shell comprises a first wall and a second wall oppositely arranged along the thickness direction of the battery cell, the first wall comprises a first sub-wall, a second sub-wall and a first connecting wall, the second sub-wall protrudes from the first sub-wall in the direction away from the second wall, and the first connecting wall connects the first sub-wall and the second sub-wall; the distance between the first sub-wall and the second sub-wall along the thickness direction of the battery cell is H1, and 0mm < H1 ≤ 1.5mm.

[0025] The first connecting wall of the battery cell is shaped by the briquetting, so that the included angle θ1 between the first connecting wall and the thickness direction of the battery cell satisfies 0° < θ1 ≤ 45°.

[0026] In the technical scheme, the electrode assembly is accommodated in the shell, so that the shell can protect the electrode assembly; the first wall comprises the first sub-wall, the second sub-wall and the first connecting wall, the second sub-wall protrudes from the first sub-wall in the direction away from the second wall, and the first connecting wall connects the first sub-wall and the second sub-wall, so that a step structure is formed between the first sub-wall and the second sub-wall, and the step structure can accommodate other components when the battery cell is assembled in an electrical equipment; the distance H1 between the first sub-wall and the second sub-wall along the thickness direction of the battery cell satisfies 0mm < H1 ≤ 1.5mm; when θ1 is greater than 0°, the electrode assembly can be conveniently assembled into the shell, and the possibility of damage of the electrode assembly and the shell in the installation process is reduced; when θ1 is less than or equal to 45°, the battery cell can be applied to the case that the step depth is less than or equal to 1.5mm, and in the case that the step depth is less than or equal to 1.5mm, the included angle θ1 between the first connecting wall and the thickness direction of the battery cell is small, the fit between the shell and the electrode assembly is good, the gap between the first connecting wall and the electrode assembly is small, the energy density of the battery cell is improved, the electrode assembly is not prone to shaking in the shell, and the stability of the battery cell is good; therefore, when 0° < θ1 ≤ 45°, the electrode assembly can be conveniently assembled into the shell, the possibility of damage of the electrode assembly and the shell in the installation process is reduced, the fit between the shell and the electrode assembly is better, the gap between the first connecting wall and the electrode assembly is smaller, the energy density of the battery cell is improved, the electrode assembly is not prone to shaking in the shell, and the stability of the battery cell is good. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained from these drawings.

[0028] Fig. 1 is a structural schematic diagram of an electric core from one perspective according to some embodiments of the present application;

[0029] Fig. 2 is a sectional structural schematic diagram of the electric core shown in Fig. 1 along A-A;

[0030] Fig. 3 is a partial enlarged structural schematic diagram of the electric core shown in Fig. 2 at B;

[0031] Fig. 4 is a structural schematic diagram of an electric core from one perspective according to some other embodiments of the present application;

[0032] Fig. 5 is a sectional structural schematic diagram of the electric core shown in Fig. 4 along C-C;

[0033] Fig. 6 is a partial enlarged structural schematic diagram of the electric core shown in Fig. 5 at D;

[0034] Fig. 7 is a flow schematic diagram of a preparation method of an electric core according to some embodiments of the present application;

[0035] Fig. 8 is a partial enlarged structural schematic diagram of an electric core before shaping according to some embodiments of the present application;

[0036] Fig. 9 is a three-dimensional structural schematic diagram of a shaping device and an electric core according to some embodiments of the present application.

[0037] Fig. 10 is a structural schematic diagram of an electric core according to some embodiments of the present application. Fig. 11 is a sectional structural schematic diagram of the electric core shown in Fig. 10 along A-A. Fig. 12 is a partial enlarged structural schematic diagram of the electric core shown in Fig. 11 at B. Fig. 13 is a structural schematic diagram of an electric core according to some other embodiments of the present application. Fig. 14 is a sectional structural schematic diagram of the electric core shown in Fig. 13 along C-C. Fig. 15 is a partial enlarged structural schematic diagram of the electric core shown in Fig. 14 at D. Fig. 16 is a flow schematic diagram of a preparation method of an electric core according to some embodiments of the present application. Fig. 17 is a partial enlarged structural schematic diagram of an electric core before shaping according to some embodiments of the present application. Fig. 18 is a three-dimensional structural schematic diagram of a shaping device and an electric core according to some embodiments of the present application.

[0038] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise required by context, singular terms shall include pluralities and vice versa. Plural components, structures, or features described herein can be replaced with a single component, structure, or feature.

[0040] The terms "first", "second", and the like, as used in the specification and claims herein, are used for distinguishing between similar elements and not necessarily for describing a specific sequential or chronological order. Unless explicitly stated otherwise, a process embodiment can include one or more instances of like elements.

[0041] Reference throughout this application to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another.

[0042] In the embodiments of the present application, the same reference signs indicate the same components, and for the sake of brevity, detailed description of the same components is 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, and the overall thickness, length, width, and other dimensions of integrated devices are only exemplary and should not constitute any limitation on the present application.

[0043] With the development of the new energy industry, batteries gradually develop 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 a folding screen needs to adapt to battery cells with steps on the surface, so as to facilitate the arrangement of circuit boards and other components at the steps of the battery cells.

[0044] In the soft package battery cell with a step shape, the packaging film is generally punched to form a shell. The first wall of the shell forms a first sub-wall, a second sub-wall, and a first connecting wall. The second sub-wall protrudes from the first sub-wall, and the first connecting wall connects the first sub-wall and the second sub-wall. A step structure is formed between the first sub-wall and the second sub-wall. However, for some packaging films, especially those with a small step depth, the angle between the first connecting wall and the thickness direction of the battery cell after punching is large, which makes it difficult to form a punch, resulting in poor adhesion of the shell to the electrode assembly. A large gap is formed between the step of the shell and the electrode assembly, causing a loss of energy density of the battery, and the electrode assembly is prone to shaking in the shell, resulting in poor stability of the battery

[0045] In order to improve the energy density and stability of the battery cell, the battery cell provided by the application comprises a shell and an electrode assembly, the electrode assembly is accommodated in the shell; the shell comprises a first wall and a second wall arranged opposite along the thickness direction of the battery cell, the first wall comprises a first sub-wall, a second sub-wall and a first connecting wall, the second sub-wall protrudes from the first sub-wall in the direction away from the second wall, and the first connecting wall connects the first sub-wall and the second sub-wall; the distance between the first sub-wall and the second sub-wall along the thickness direction of the battery cell is H1, and 0mm<H1≤1.5mm is satisfied; the angle between the first connecting wall and the thickness direction of the battery cell is θ1, and 0°<θ1≤45° is satisfied.

[0046] In the battery cell shell with the structure, by accommodating the electrode assembly in the shell, the shell can play a protective role on the electrode assembly; by arranging the first wall and the second wall opposite along the thickness direction of the battery cell, the first wall comprising a first sub-wall, a second sub-wall and a first connecting wall, the second sub-wall protruding from the first sub-wall in the direction away from the second wall, and the first connecting wall connecting the first sub-wall and the second sub-wall, a step structure is formed between the first sub-wall and the second wall, which can accommodate other components when the battery cell is assembled in the electrical equipment; by satisfying 0mm<H1≤1.5mm between the first sub-wall and the second sub-wall along the thickness direction of the battery cell, when θ1 is greater than 0°, the electrode assembly can be easily assembled into the shell, and the possibility of damage caused by extrusion of the electrode assembly and the shell during installation can be reduced; when θ1 is less than or equal to 45°, the battery cell can be applied to the case where the step depth is less than or equal to 1.5mm, and in the case where the step depth is less than or equal to 1.5mm, the angle θ1 between the first connecting wall and the thickness direction of the battery cell is smaller, which can make the shell and the electrode assembly better fit, the gap between the first connecting wall and the electrode assembly is smaller, which is beneficial to improve the energy density of the battery cell, and the electrode assembly is not easy to shake in the shell, so that the stability of the battery cell is better; therefore, when 0°<θ1≤45°, the electrode assembly can be easily assembled into the shell, the possibility of damage caused by extrusion of the electrode assembly and the shell during installation can be reduced, the shell and the electrode assembly can better fit, the gap between the first connecting wall and the electrode assembly is smaller, which is beneficial to improve the energy density of the battery cell, and the electrode assembly is not easy to shake in the shell, so that the stability of the battery cell is better.

[0047] The battery cell provided by the embodiment of the application can be a secondary battery or a primary battery, for example, can be a lithium ion battery, a sodium ion battery or a magnesium ion battery, etc., and the embodiment of the application is not limited thereto. The electrochemical device can be in the shape of a cylinder, a flat body, a cuboid or other shapes, and the embodiment of the application is not limited thereto.

[0048] The embodiments of the present application provide a power consumption device using an electric core as a power supply, which can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc.

[0049] Referring to FIGS. 1-3, FIG. 1 is a structural schematic diagram of an electric core according to some embodiments of the present application, FIG. 2 is a sectional structural schematic diagram of the electric core shown in FIG. 1 along A-A, and FIG. 3 is a partial enlarged structural schematic diagram of B of the electric core shown in FIG. 2.

[0050] The embodiments of the present application provide an electric core 10, which comprises a shell 100 and an electrode assembly 200, and the electrode assembly 200 is accommodated in the shell 100.

[0051] By accommodating the electrode assembly 200 in the shell 100, the shell 100 can play a protective role on the electrode assembly 200.

[0052] The electric core 10 comprises the shell 100, an electrode assembly and an electrolyte, and the shell 100 is used to accommodate the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The electric core 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 comprises a positive current collector and a positive active material layer, and the positive active material layer is coated on the surface of the positive current collector. The part of the positive current collector without the positive active material layer serves as a positive tab to realize the input or output of electric energy of the positive electrode sheet through the positive tab. The positive tab and the positive current collector can also be separately arranged and then connected as a whole, such as being connected as a whole by welding, conductive glue connection or the like. Taking a lithium ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary material or lithium manganate, etc. The negative electrode sheet comprises a negative current collector and a negative active material layer, and the negative active material layer is coated on the surface of the negative current collector. The part of the negative current collector without the negative active material layer serves as a negative tab to realize the input or output of electric energy of the negative electrode sheet through the negative tab. The negative tab and the negative current collector can also be separately arranged and then connected as a whole, such as being connected as a whole by welding, conductive glue connection or the like. The material of the negative current collector can be copper, and the negative active material can be a carbon material or a silicon material, etc. The material of the separator can be polypropylene (PP) or polyethylene (PE), etc. The electrolyte can include an organic solvent, an electrolyte lithium salt, etc.

[0053] In some embodiments, the electrode assembly can be a laminated electrode assembly, and at least one positive electrode sheet, at least one negative electrode sheet and at least one separator are laminated in a certain order. The separator 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 electric core 10.

[0054] In some embodiments, the electrode assembly can also be a wound electrode assembly. The positive electrode tab, the negative electrode tab and the separator film are stacked in a certain order and wound around a winding center axis to form a wound electrode assembly. The separator film is arranged between the positive electrode tab and the negative electrode tab, and the separator film is used to insulate and separate the positive electrode tab and the negative electrode tab.

[0055] In some embodiments, the outer shell 100 can be made of an aluminum plastic film.

[0056] In some embodiments, the outer shell 100 includes a first wall 110 and a second wall 120 arranged opposite to each other along the thickness direction X of the battery cell, the first wall 110 includes a first sub-wall 111, a second sub-wall 112 and a first connecting wall 113, the second sub-wall 112 protrudes from the first sub-wall 111 in a direction away from the second wall 120, and the first connecting wall 113 connects the first sub-wall 111 and the second sub-wall 112.

[0057] By arranging the outer shell 100 to include a first wall 110 and a second wall 120 arranged opposite to each other along the thickness direction X of the battery cell, the first wall 110 includes a first sub-wall 111, a second sub-wall 112 and a first connecting wall 113, the second sub-wall 112 protrudes from the first sub-wall 111 in a direction away from the second wall 120, and the first connecting wall 113 connects the first sub-wall 111 and the second sub-wall 112, a step structure is formed between the first sub-wall 111 and the second sub-wall 112, which can be used to accommodate other components when the battery cell 10 is assembled in the electrical equipment.

[0058] In some embodiments, the distance between the first sub-wall 111 and the second sub-wall 112 along the thickness direction X of the battery cell is H1, which satisfies 0mm < H1 ≤ 1.5mm. For example, H1 can be 1.5mm, 1.2mm or 1mm. The angle between the first connecting wall 113 and the thickness direction X of the battery cell is θ1, which satisfies 0° < θ1 ≤ 45°. For example, θ1 can be 45°, 40° or 35°, etc.

[0059] When θ1 is greater than 0°, the electrode assembly 200 can be conveniently installed into the shell 100, and the possibility of extrusion damage of the electrode assembly 200 and the shell 100 during installation can be reduced; when θ1 is less than or equal to 45°, the battery cell 10 can be applicable to the case where the step depth is less than or equal to 1.5 mm, and in the case where the step depth is less than or equal to 1.5 mm, the first connecting wall 113 has a smaller angle θ1 with the thickness direction X of the battery cell, the fit between the shell 100 and the electrode assembly 200 is better, the gap between the first connecting wall 113 and the electrode assembly 200 is smaller, the energy density of the battery cell 10 can be improved, and the electrode assembly 200 is less likely to shake in the shell 100, so that the stability of the battery cell 10 is better; therefore, when 0° < θ1 ≤ 45°, the electrode assembly 200 can be conveniently installed into the shell 100, the possibility of extrusion damage of the electrode assembly 200 and the shell 100 during installation can be reduced, the fit between the shell 100 and the electrode assembly 200 is better, the gap between the first connecting wall 113 and the electrode assembly 200 is smaller, the energy density of the battery cell 10 can be improved, and the electrode assembly 200 is less likely to shake in the shell 100, so that the stability of the battery cell 10 is better.

[0060] In some embodiments, the first connecting wall 113 includes a first main portion 1131, a first transition portion, and a second transition portion, a surface of the first main portion 1131 is arranged in a plane, the first transition portion is connected with the first sub-wall 111, and the second transition portion is connected with the second sub-wall 112. The angle θ1 between the first connecting wall 113 and the thickness direction X of the battery cell is the angle between the plane where the first main portion 1131 is located and the direction from the second wall 120 to the first wall 110 in the thickness direction X of the battery cell.

[0061] In some embodiments, 0mm < H1 ≤ 1mm. For example, H1 can be 1mm, 0.8mm, or 0.7mm, etc.

[0062] In some embodiments, 20° ≤ θ1 ≤ 45°. For example, θ1 can be 20°, 30°, or 45°, etc.

[0063] When θ1 is greater than or equal to 20°, the electrode assembly 200 can be conveniently installed into the shell 100, and the possibility of the electrode assembly 200 being extruded and damaged during installation can be reduced; when θ1 is less than or equal to 45°, the battery cell 10 can be further applicable to a case where the step depth is less than or equal to 1 mm, so that the application range of the battery cell 10 is wider, and in the case where the step depth is less than or equal to 1 mm, the angle θ1 between the first connecting wall 113 and the thickness direction of the battery cell 10 is smaller, so that the fit of the shell 100 and the electrode assembly 200 is better, the gap between the first connecting wall 113 and the electrode assembly 200 is smaller, which is conducive to further improving the energy density of the battery cell 10, and the electrode assembly 200 is not prone to shaking in the shell 100, so that the stability of the battery cell 10 is better; therefore, when 0 mm < H1 ≤ 1 mm and 20° ≤ θ1 ≤ 45°, the electrode assembly 200 can be conveniently installed into the shell 100, and the possibility of the electrode assembly 200 being extruded and damaged during installation can be reduced, and the fit of the shell 100 and the electrode assembly 200 can be further better, the gap between the first connecting wall 113 and the electrode assembly 200 is smaller, which is conducive to further improving the energy density of the battery cell 10, and the electrode assembly 200 is not prone to shaking in the shell 100, so that the stability of the battery cell 10 is better.

[0064] In some embodiments, the electrode assembly 200 includes a first tab group 210 and a second tab group 220, the first tab group 210 and the second tab group 220 are stacked, and the size of the first tab group 210 along the first direction Y is greater than the size of the second tab group 220 along the first direction Y. The first tab group 210 is located between the first sub-wall 111 and the second wall 120, and the second tab group 220 is located between the first tab group 210 and the second sub-wall 112.

[0065] The first direction Y is perpendicular to the thickness direction X of the battery cell.

[0066] By making the electrode assembly 200 include a first tab group 210 and a second tab group 220, the first tab group 210 and the second tab group 220 are stacked, and the size of the first tab group 210 along the first direction Y is greater than the size of the second tab group 220 along the first direction Y, the first tab group 210 and the second tab group 220 can be formed together to form a step structure to adapt to the step structure of the shell 100; the first tab group 210 is located between the first sub-wall 111 and the second wall 120, and the second tab group 220 is located between the first tab group 210 and the second sub-wall 112, so that the second tab group 220 is accommodated at the step structure of the shell 100 to adapt to the first wall 110 and the second wall 120 of the shell 100.

[0067] In some embodiments, the first tab group 210 includes a plurality of first positive electrode tabs 211 and a plurality of first negative electrode tabs 212 arranged in a stack. The energy density of the first tab group 210 is relatively high.

[0068] In other embodiments, the first tab group 210 can include one first positive electrode tab 211 and one first negative electrode tab 212 arranged in a stack.

[0069] In some embodiments, the first sub-wall 111 has a first end close to the first connecting wall 113, the second tab group 220 includes a second positive electrode tab 221 and a second negative electrode tab 222 arranged in a stack, and the distance between the end of the second negative electrode tab 222 close to the first connecting wall 113 and the first end along the first direction Y is D, which satisfies D≤1.5mm. For example, D can be 1.5mm, 1.2mm, or 1mm, etc.

[0070] By having the first sub-wall 111 with the first end close to the first connecting wall 113, the second tab group 220 includes the second positive electrode tab 221 and the second negative electrode tab 222 arranged in a stack, and the distance D between the end of the second negative electrode tab 222 close to the first connecting wall 113 and the first end along the first direction Y satisfies D≤1.5mm, the gap between the first connecting wall 113 and the electrode assembly 200 along the first direction Y can be relatively small, which is beneficial to improve the energy density of the battery cell 10, and the electrode assembly 200 is less likely to shake in the shell 100, and the stability of the battery cell 10 is relatively good.

[0071] In some embodiments, the second tab group 220 can include one second positive electrode tab 221 and one second negative electrode tab 222 arranged in a stack, so that the thickness of the second tab group 220 is relatively small and can be accommodated between the first tab group 210 and the second sub-wall 112.

[0072] In other embodiments, the second tab group 220 can also include a plurality of second positive electrode tabs 221 and a plurality of second negative electrode tabs 222 arranged in a stack, so that the energy density of the second tab group 220 is relatively high.

[0073] In some embodiments, along the thickness direction X of the battery cell, the distance between the first sub-wall 111 and the second wall 120 is T1, and the distance between the second sub-wall 112 and the second wall 120 is T2, which satisfies T1

[0074] By making the distance T1 between the first sub-wall 111 and the second wall 120 and the distance T2 between the second sub-wall 112 and the second wall 120 along the thickness direction X of the battery cell satisfy T1 < T2, a step structure can be formed between the first sub-wall 111 and the second sub-wall 112, which can be used to accommodate other components when the battery cell 1010 is assembled in the electrical equipment, and adapt to different electrical equipment.

[0075] In some embodiments, the surface of the second wall 120 is arranged in a plane, so that the shell 100 forms a step structure on only one side of the thickness direction X of the battery cell to adapt to the electrical equipment.

[0076] In some embodiments, one end of the first connecting wall 113 is connected to the first sub-wall 111 through a first circular arc transition part 1132, and the other end of the first connecting wall 113 is connected to the second sub-wall 112 through a second circular arc transition part 1133.

[0077] By making one end of the first connecting wall 113 connected to the first sub-wall 111 through a first circular arc transition part 1132, and the other end of the first connecting wall 113 connected to the second sub-wall 112 through a second circular arc transition part 1133, the first wall 110 can be conveniently prepared and shaped, and the first circular arc transition part 1132 and the second circular arc transition part 1133 have more uniform force distribution when stressed, which is less likely to cause stress concentration, thereby reducing the possibility of damage to the first connecting wall 113 under stress, and also less likely to cause damage to other components.

[0078] Referring to FIGS. 4-6, FIG. 4 is a structural schematic diagram of the battery cell from one perspective according to some embodiments of the present application, FIG. 5 is a cross-sectional structural schematic diagram of the battery cell along C-C shown in FIG. 4, and FIG. 6 is a partially enlarged structural schematic diagram of D of the battery cell shown in FIG. 5.

[0079] In some embodiments, the first wall 110 further includes a third sub-wall 114 and a second connecting wall 115, the third sub-wall 114 is located on the side of the second sub-wall 112 away from the first sub-wall 111, and the second sub-wall 112 protrudes from the third sub-wall 114 in a direction away from the second wall 120, and the second connecting wall 115 connects the second sub-wall 112 and the third sub-wall 114.

[0080] By making the first wall 110 further include a third sub-wall 114 and a second connecting wall 115, the third sub-wall 114 is located on the side of the second sub-wall 112 away from the first sub-wall 111, and the second sub-wall 112 protrudes from the third sub-wall 114 in a direction away from the second wall 120, and the second connecting wall 115 connects the second sub-wall 112 and the third sub-wall 114, so that a step structure is formed between the second sub-wall 112 and the third sub-wall 114, which can be used to accommodate other components when the battery cell 10 is assembled in the electrical equipment.

[0081] In some embodiments, along the thickness direction X of the battery cell, the distance between the second sub-wall 112 and the third sub-wall 114 is H2, which satisfies 0mm < H2≤ 1.5mm. For example, H2 can be 1.5mm, 1.2mm or 1mm. The angle between the second connecting wall 115 and the thickness direction X of the battery cell is θ2, which satisfies 0° < θ2≤ 45°. For example, θ2 can be 45°, 40° or 35°, etc.

[0082] When θ2 is greater than 0°, the electrode assembly 200 can be conveniently installed into the shell 100, and the possibility of the electrode assembly 200 being squeezed and damaged during installation can be reduced. When θ2 is less than or equal to 45°, the battery cell 10 can be applicable to the case where the step depth is less than or equal to 1.5mm, and in the case where the step depth is less than or equal to 1.5mm, the angle θ2 between the second connecting wall 115 and the thickness direction X of the battery cell is smaller, which can make the shell 100 and the electrode assembly 200 better fit, the gap between the second connecting wall 115 and the electrode assembly 200 is smaller, which is conducive to improving the energy density of the battery cell 10, and the electrode assembly 200 is less likely to shake in the shell 100, so that the stability of the battery cell 10 is better. Therefore, when 0° < θ2≤ 45°, the electrode assembly 200 can be conveniently installed into the shell 100, and the possibility of the electrode assembly 200 being squeezed and damaged during installation can be reduced, and the shell 100 and the electrode assembly 200 can better fit, the gap between the second connecting wall 115 and the electrode assembly 200 is smaller, which is conducive to improving the energy density of the battery cell 10, and the electrode assembly 200 is less likely to shake in the shell 100, so that the stability of the battery cell 10 is better.

[0083] In some embodiments, the second connecting wall 115 includes a second main body part 1151, a third transition part 1152 and a fourth transition part 1153. The surface of the second main body part 1151 is arranged in a plane. The third transition part 1152 is connected with the third sub-wall 114, and the fourth transition part 1153 is connected with the second sub-wall 112. The angle θ1 between the second connecting wall 115 and the thickness direction X of the battery cell is the angle between the plane where the second main body part 1151 is located and the direction from the second wall 120 towards the first wall 110 in the thickness direction X of the battery cell.

[0084] In some embodiments, 0mm < H2≤ 1mm. For example, H2 can be 1mm, 0.8mm or 0.7mm, etc.

[0085] In some embodiments, 20°≤ θ2≤ 45°. For example, θ2 can be 20°, 30° or 45°, etc.

[0086] By making 0mm < H1≤ 2mm, 20°≤ θ2≤ 45°, the battery cell 10 can be further applicable to the case where the step depth is less than or equal to 1mm, the application range of the battery cell 10 is wider, and in the case where the step depth is less than or equal to 1mm, the angle θ2 between the second connecting wall 115 and the thickness direction X of the battery cell is smaller, the fit between the shell 100 and the electrode assembly 200 is better, the gap between the second connecting wall 115 and the electrode assembly 200 is smaller, which is beneficial to further improve the energy density of the battery cell 10, and the electrode assembly 200 is not easy to shake in the shell 100, further making the stability of the battery cell 10 better.

[0087] In some embodiments, an insulating layer 130 is arranged between the first wall 110 and the electrode assembly 200, and the insulating layer 130 at least covers the inner surface of the first connecting wall 113.

[0088] By arranging the insulating layer 130 between the first wall 110 and the electrode assembly 200, and the insulating layer 130 at least covering the inner surface of the first connecting wall 113, the insulating layer 130 can play an insulating role between the shell 100 and the electrode assembly 200, and also play a protective role for the shell 100, which can reduce the possibility of the electrode assembly 200 damaging the first connecting wall 113.

[0089] In some embodiments, the insulating layer 130 can cover the inner surface of the first wall 110. The insulating layer 130 can play an insulating role between the shell 100 and the electrode assembly 200, and also play a protective role for the shell 100, which can reduce the possibility of the electrode assembly 200 damaging the first wall 110.

[0090] In some embodiments, the insulating layer 130 can cover the inner surface of the shell 100. The insulating layer 130 can play an insulating role between the shell 100 and the electrode assembly 200, and also play a protective role for the shell 100, which can reduce the possibility of the electrode assembly 200 damaging the shell 100.

[0091] In some embodiments, the insulating layer 130 can include at least one of ethylene, propylene, vinylidene fluoride, acrylic acid, acrylate, styrene, acrylonitrile, maleic anhydride, vinyl chloride, and chloropropene.

[0092] In some embodiments, the shell 100 includes a first sealing portion 140 and a second sealing portion 150, and the first sealing portion 140 and the second sealing portion 150 are arranged opposite to each other along the first direction Y. The first sealing portion 140 is arranged to be bent towards the electrode assembly 200, and the second sealing portion 150 is arranged to be bent towards the electrode assembly 200, which can make the space occupied by the shell 100 smaller, and is beneficial to improve the energy density of the battery cell 10.

[0093] In some embodiments, along the thickness direction X of the battery cell, the first sealing portion 140 does not exceed the first wall 110, and the second sealing portion 150 does not exceed the first wall 110, so that the first sealing portion 140 and the second sealing portion 150 have less impact on the overall thickness of the battery cell 10, which is conducive to improving the energy density of the battery cell 10.

[0094] Referring to FIG. 1, in some embodiments, the battery cell 10 includes a first electrical connector 230 and a second electrical connector 240, the first electrical connector 230 is connected with the positive electrode tab of the electrode assembly 200, and the second electrical connector 240 is connected with the negative electrode tab of the electrode assembly 200 and extends out of the shell 100 along the second direction Y.

[0095] In some embodiments, the thickness direction X of the battery cell, the first direction Y, and the second direction Z are perpendicular to each other in pairs.

[0096] In some embodiments, the first electrical connector 230 and the positive electrode tab can be a welded connection, and the second electrical connector 240 and the negative electrode tab can be a welded connection.

[0097] In other embodiments, the first electrical connector 230 and the positive electrode tab can be integrally formed, and the second electrical connector 240 and the negative electrode tab can be integrally formed.

[0098] In some embodiments, the first electrical connector 230 and the second electrical connector 240 can be made of a material with good electrical conductivity, such as a metal material such as lead or copper.

[0099] In other embodiments, the first electrical connector 230 and the second electrical connector 240 can extend out of the shell 100 along the first direction Y.

[0100] Along the first direction Y, the first electrical connector 230 and the second electrical connector 240 are located on the same side of the electrode assembly 200, and the first electrical connector 230 and the first sub-wall 111 are located on opposite sides of the electrode assembly 200.

[0101] Referring to Table 1, H1 in Table 1 is the distance between the first sub-wall 111 and the second sub-wall 112 along the thickness direction X of the battery cell; θ1 is the included angle between the first connecting wall 113 and the thickness direction X of the battery cell; D is the distance between the end of the second negative electrode tab 222 close to the first connecting wall 113 and the first end of the first sub-wall 111 close to the first connecting wall 113 along the first direction Y; and S is the area of the cavity 201 formed by the first connecting wall 113, the end surface of the second negative electrode tab 222 close to the first connecting wall 113, and the plane in which the inner surface of the first sub-wall 111 is located.

[0102] When the punch pit depth of the packaging film is greater than 1.5 mm, a smaller included angle can be directly formed between the first connecting wall and the thickness direction of the battery cell through the punch pit, so that the fit of the shell and the electrode assembly is better. When the punch pit depth of the packaging film is less than or equal to 1.5 mm, it is difficult to form a smaller included angle between the first connecting wall and the thickness direction of the battery cell, resulting in poor fit of the shell and the electrode assembly. Therefore, only the comparative example H1≤1.5 mm in Table 1 is provided in the present application.

[0103] The measurement method of the parameters in Table 1 is as follows:

[0104] (1) H1 is the distance measurement value from the inner surface of the second wall 120 to the inner surface of the first wall 110 along the thickness direction X of the battery cell.

[0105] (2) θ1 is the included angle measurement value of the plane where the first main body part 1131 of the first connecting wall 131 is located and the direction from the second wall 120 to the first wall 110 in the thickness direction X of the battery cell.

[0106] (3) D is the distance measurement value between the plane where the one end of the second negative electrode tab 222 close to the first connecting wall 113 is located and the first end of the first sub-wall 111 close to the first connecting wall 113 (i.e. the bending start end of the first connecting wall 113) along the first direction Y.

[0107] (4) S is the area of the cavity 201 formed by the first connecting wall 113, the plane where the end surface of the second negative electrode tab 222 close to the first connecting wall 113 is located, and the plane where the inner surface of the first wall 110 is located, which is approximately a right triangle, and can be obtained by the length D of the cavity 201 along the first direction Y and the length H1 of the cavity 201 along the thickness direction X of the battery cell, i.e. S = 1 / 2*(H1*D).

[0108] Measurement of the spacing between the electrode assembly and the shell in Table 1

[0109] According to Table 1, the following conclusions can be drawn:

[0110] 1. Referring to Comparative Example 1 and Example 1-4, Comparative Example 2 and Example 5-8, and Comparative Example 3 and Example 9-12, when θ1 is greater than 45°, the spacing distance between the first connecting wall 113 along the first direction Y and the second negative electrode tab 222 is larger, which can cause the fit of the shell 100 and the electrode assembly 200 to be poor, the electrode assembly 200 can easily shake in the shell 100, and the stability of the battery cell 10 can be affected; and the area of the cavity 201 is larger, which can cause the internal space of the battery cell 10 to be wasted, and the energy density of the battery cell 10 can be affected.

[0111] When θ1 is less than or equal to 45°, the interval distance between the first connecting wall 113 and the second negative electrode tab 222 in the first direction Y is small, which makes the electrode assembly 200 less likely to shake in the shell 100, and the stability of the battery cell 10 is good; and the area of the cavity 201 is small, which is conducive to improving the energy density of the battery cell 10.

[0112] 2、See examples 1-4, because when the electrode assembly 200 is installed in the shell 100, the shell 100 and the electrode assembly 200 need to have a certain space, otherwise it is easy to cause the electrode assembly 200 and the shell 100 to be difficult to install, and it is easy to cause the shell 100 or the electrode assembly 200 to be extruded and damaged, and when D is greater than 0.4mm, it is convenient for the electrode assembly 200 to be installed in the shell 100, therefore, when 20°≤θ1≤45°, the electrode assembly 200 can be conveniently installed in the shell 100, and the shell 100 and the electrode assembly 200 have good fit, the electrode assembly 200 is less likely to shake in the shell 100, and the stability of the battery cell 10 is good; and the area of the cavity 201 is small, which is conducive to improving the energy density of the battery cell 10.

[0113] The application embodiment provides a kind of electric equipment, including the battery cell 10 of any one of the above scheme, and the battery cell 10 is used to provide electric energy for electric equipment.

[0114] Electric equipment can be any one of the above application battery cell 10 device or system.

[0115] Referring to FIG. 7, FIG. 7 is a flowchart of a method for preparing a battery cell according to some embodiments of the application.

[0116] The application embodiment provides a kind of battery cell 10 preparation method, comprising:

[0117] S11, providing a battery cell 10, the battery cell 10 includes a shell 100 and an electrode assembly 200, the electrode assembly 200 is received in the shell 100; the shell 100 includes a first wall 110 and a second wall 120 arranged opposite along the thickness direction X of the battery cell, the first wall 110 includes a first sub-wall 111, a second sub-wall 112 and a first connecting wall 113, the second sub-wall 112 protrudes from the first sub-wall 111 in the direction away from the second wall 120, and the first connecting wall 113 connects the first sub-wall 111 and the second sub-wall 112; the distance between the first sub-wall 111 and the second sub-wall 112 along the thickness direction X of the battery cell is H1, and satisfies 0mm<H1≤1.5mm.

[0118] S12, the first connecting wall 113 of the battery cell 10 is shaped by briquetting, so that the angle θ1 between the first connecting wall 113 and the thickness direction X of the battery cell satisfies 0°<θ1≤45°.

[0119] By accommodating the electrode assembly 200 in the shell 100, the shell 100 can protect the electrode assembly 200; by arranging the first wall 110 and the second wall 120 opposite to each other along the thickness direction X of the battery cell, the first wall 110 includes the first sub-wall 111, the second sub-wall 112, and the first connecting wall 113, the second sub-wall 112 protrudes from the first sub-wall 111 in a direction away from the second wall 120, and the first connecting wall 113 connects the first sub-wall 111 and the second sub-wall 112 to form a stepped structure between the first sub-wall 111 and the second sub-wall 112, which can accommodate other components when the battery cell 10 is assembled in the electrical equipment; by arranging the distance H1 between the first sub-wall 111 and the second sub-wall 112 along the thickness direction X of the battery cell to satisfy 0mm < H1 ≤ 1.5mm; when θ1 is greater than 0°, the electrode assembly 200 can be easily assembled into the shell 100, and the possibility of damage caused by extrusion of the electrode assembly 200 and the shell 100 during installation can be reduced; when θ1 is less than or equal to 45°, the battery cell 10 can be applied to the case where the step depth is less than or equal to 1.5mm, and in the case where the step depth is less than or equal to 1.5mm, the angle θ1 between the first connecting wall 113 and the thickness direction X of the battery cell is small, which can make the shell 100 better fit the electrode assembly 200, the gap between the first connecting wall 113 and the electrode assembly 200 is small, which is beneficial to improve the energy density of the battery cell 10, and the electrode assembly 200 is not easy to shake in the shell 100, so that the stability of the battery cell 10 is good; therefore, when 0° < θ1 ≤ 45°, the electrode assembly 200 can be easily assembled into the shell 100, the possibility of damage caused by extrusion of the electrode assembly 200 and the shell 100 during installation can be reduced, the shell 100 can better fit the electrode assembly 200, the gap between the first connecting wall 113 and the electrode assembly 200 is smaller, which is beneficial to improve the energy density of the battery cell 10, and the electrode assembly 200 is not easy to shake in the shell 100, so that the stability of the battery cell 10 is good.

[0120] Referring to FIG. 2, FIG. 8 and FIG. 9, FIG. 8 is a partial enlarged structure schematic view of the battery cell before shaping according to some embodiments of the present application, and FIG. 9 is a three-dimensional structure schematic view of a shaping device and the battery cell according to some embodiments of the present application.

[0121] The present application provides a preparation method of a battery cell, comprising:

[0122] S21, a packaging film is provided, a first part of the packaging film is punched to form a first wall 110, the first wall 110 includes a first sub-wall 111, a second sub-wall 112, and a first connecting wall 113, the second sub-wall 112 protrudes from the first sub-wall 111, and the first connecting wall 113 connects the first sub-wall 111 and the second sub-wall 112; along the thickness direction of the first part, the distance between the first sub-wall 111 and the second sub-wall 112 is H1, and 0mm < H1 ≤ 1.5mm is satisfied.

[0123] S22, a second part of the packaging film is punched to form a second wall 120.

[0124] S23, an electrode assembly 200 is provided, the electrode assembly 200 is arranged on the packaging film, and the first part and the second part of the packaging film are folded to make the first wall 110 and the second wall 120 respectively located on both sides of the electrode assembly 200 along the thickness direction thereof.

[0125] S24, the packaging film is edge sealed and cut to form a shell 100, and the shell 100 and the electrode assembly 200 constitute a battery cell 10.

[0126] S25, at the stage of exhausting or forming of the battery cell 10, the first connecting wall 113 of the battery cell 10 is shaped by a pressing block 320, so that the included angle θ1 between the first connecting wall 113 and the thickness direction X of the battery cell satisfies 0° < θ1 ≤ 45°.

[0127] In some embodiments, after step S24, the battery cell 10 shown in FIG. 7 is formed, the first connecting wall 113 of the battery cell 10 is not shaped, the shell 100 has poor adhesion with the electrode assembly 200, and the spacing distance between the first connecting wall 113 and the second tab group 220 along the first direction Y is large.

[0128] In some embodiments, the shaping device includes a bearing table 310 and a pressing block 320, the pressing block 320 is provided with a protrusion 321, the battery cell 10 can be arranged on the bearing table 310, the pressing block 320 moves towards the bearing table 310, so that the protrusion 321 acts on the first connecting wall 113, thereby making the first connecting wall 113 adhere to the electrode assembly 200 along the first direction Y, and forming the battery cell 10 shown in FIG. 2.

[0129] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0130] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. 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. An electric cell, characterized by, The battery cell comprises a shell and an electrode assembly accommodated in the shell; The shell comprises a first wall and a second wall oppositely arranged along the thickness direction of the battery cell, the first wall comprises a first sub-wall, a second sub-wall and a first connecting wall, the second sub-wall protrudes from the first sub-wall in a direction away from the second wall, and the first connecting wall connects the first sub-wall and the second sub-wall; The distance between the first sub-wall and the second sub-wall along the thickness direction of the battery cell is H1, and 0mm < H1 ≤ 1.5mm is satisfied; The included angle between the first connecting wall and the thickness direction of the battery cell is θ1, and 0° < θ1 ≤ 45° is satisfied.

2. The electric cell of claim 1, wherein, 0mm < H1 ≤ 1mm and 20° ≤ θ1 ≤ 45° are satisfied.

3. The electric cell of claim 1, wherein, The electrode assembly comprises a first electrode tab group and a second electrode tab group, the first electrode tab group and the second electrode tab group are arranged in a stack, and the size of the first electrode tab group along a first direction is greater than the size of the second electrode tab group along the first direction; The first electrode tab group is located between the first sub-wall and the second wall, and the second electrode tab group is located between the first electrode tab group and the second sub-wall; The first direction is perpendicular to the thickness direction of the battery cell.

4. The electric cell of claim 3, wherein, The first sub-wall has a first end close to the first connecting wall, the second electrode tab group comprises a second positive electrode tab and a second negative electrode tab arranged in a stack, and the distance between one end of the second negative electrode tab close to the first connecting wall and the first end along the first direction is D, and D ≤ 1.5mm is satisfied.

5. The electric cell of claim 1, wherein, The distance between the first sub-wall and the second wall along the thickness direction of the battery cell is T1, and the distance between the second sub-wall and the second wall along the thickness direction of the battery cell is T2, and T1 < T2 is satisfied.

6. The electric cell of claim 1, wherein, One end of the first connecting wall is connected with the first sub-wall through a first circular arc transition part, and the other end of the first connecting wall is connected with the second sub-wall through a second circular arc transition part.

7. The electric cell of claim 1, wherein, The first wall further comprises a third sub-wall and a second connecting wall, the third sub-wall is located on the side of the second sub-wall away from the first sub-wall, the second sub-wall protrudes from the third sub-wall in a direction away from the second wall, and the second connecting wall connects the second sub-wall and the third sub-wall; The distance between the second sub-wall and the third sub-wall along the thickness direction of the battery cell is H2, and 0mm < H2 ≤ 1.5mm is satisfied; The included angle between the second connecting wall and the thickness direction of the battery cell is θ2, and 0° < θ2 ≤ 45° is satisfied.

8. The cell of any of claims 1-7, wherein, An insulating layer is arranged between the first wall and the electrode assembly, and the insulating layer covers at least the inner surface of the first connecting wall.

9. An electric device, characterized by The battery cell as claimed in any one of claims 1 to 8 is used to provide electric energy.

10. A method of making an electrochemical cell, characterized by, The battery cell comprises a shell and an electrode assembly accommodated in the shell; Provided is an electric core, comprising a shell and an electrode assembly, the electrode assembly being accommodated in the shell; the shell comprises a first wall and a second wall arranged oppositely along the thickness direction of the electric core, the first wall comprises a first sub-wall, a second sub-wall and a first connecting wall, the second sub-wall protrudes from the first sub-wall in a direction away from the second wall, and the first connecting wall connects the first sub-wall and the second sub-wall; the distance between the first sub-wall and the second sub-wall along the thickness direction of the electric core is H1, and 0mm < H1 ≤ 1.5mm is satisfied; The first connecting wall of the electric core is shaped by a pressing block, so that the included angle θ1 between the first connecting wall and the thickness direction of the electric core satisfies 0° < θ1 ≤ 45°.

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