Battery cells, batteries and power consuming devices

Abstract

A battery cell (20), a battery (100), and a power consumption device, wherein the battery cell (20) comprises a shell (21) having a plurality of wall portions (211), the plurality of wall portions (211) including a first wall (201) having a main body portion (2011) and an edge portion (2012) connected to the main body portion (2011), the edge portion (2012) being connected to an adjacent wall portion (211), the shell (21) having a wall thickness of the edge portion (2012) greater than the wall thickness of the main body portion (2011), an electrode assembly provided within the shell (21), and an electrode terminal provided on the wall portion (201) and electrically connected to the electrode assembly.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application is based on and claims priority from a Chinese patent application having application number 202322476888.3 and filing date September 12, 2023, the entire contents of which are incorporated herein by reference.

[0002] This application relates to the field of battery technology, and more particularly to battery cells, batteries, and power consuming devices. [Background technology]

[0003] In recent years, new energy vehicles have evolved dramatically. In the field of electric vehicles, power batteries play an irreplaceable and important role as the power source for electric vehicles. A battery consists of a housing and a number of battery cells housed within the housing. As a core component of new energy vehicles, batteries have high requirements in terms of safety and service life. However, during battery use, the thin-shell structure design of the battery cells can cause problems such as insufficient reliability of the battery cells, which further affects the reliability of the battery. Summary of the Invention

[0004] The embodiments of the present application provide a battery cell, a battery, and a power consumption device that can effectively improve the reliability of the battery cell and the battery, and further improve the usage performance of the battery cell and the battery.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, the battery cell including: a shell having a plurality of wall portions, the plurality of wall portions including a first wall having a main body portion and an edge portion connected to the main body portion, the edge portion being connected to an adjacent wall portion, the wall thickness of the edge portion being greater than the wall thickness of the main body portion; an electrode assembly provided within the shell; and an electrode terminal provided on the wall portion and electrically connected to the electrode assembly.

[0006] In the above technical solution, the first wall is configured to include a main body portion and an edge portion connected to the main body portion, the edge portion is connected to an adjacent wall portion, and the wall thickness of the edge portion is greater than the wall thickness of the main body portion. By adopting this structure, regions of different thicknesses can be formed on the first wall. The main body portion is the main body portion of the first wall and has a relatively small thickness, which can meet the requirement of increasing battery energy density. The edge portion is the portion of the first wall connected to an adjacent wall portion and has a relatively large thickness. Since a certain gap is generally left at the edge position between the electrode assembly and the shell, the wall thickness of the edge portion is greater than the wall thickness of the main body portion, which can be fully utilized and does not occupy the storage space required for the electrode assembly. Meanwhile, the strength of the connection portion between the first wall and the adjacent wall portion (i.e., the corner position of the shell) can be improved, which effectively alleviates the problem of insufficient strength at the corner position of the shell when the shell is compressed. The compression resistance and impact resistance of the shell can be improved, thereby improving the reliability of the battery cell and the battery.

[0007] In some embodiments of the present application, the area of ​​the first wall is greater than the area of ​​the remaining wall portions.

[0008] In the above technical solution, the area of ​​the first wall is set to be larger than the area of ​​the remaining walls, i.e., the first wall is the larger wall of the shell. By adopting this method, the strength of the larger wall can be effectively improved, further increasing the strength of the entire shell. Meanwhile, the strength requirement of the larger wall can be met. At the same time, the wall thickness of the main body of the larger wall can be made relatively thin, which saves material, increases the accommodation space of the electrode assembly in the shell, and further increases the volume of the electrode assembly, which is beneficial to increasing the battery energy density of the battery cell.

[0009] In some embodiments of the present application, the wall thickness of at least a portion of the edge is equal to or greater than the wall thickness of the adjacent wall.

[0010] In the above technical solution, the wall thickness of at least a part of the edge is set to be equal to or greater than the wall thickness of the adjacent wall, so that the wall thickness of the edge is equal to or greater than the wall thickness of any of the multiple wall parts, i.e., the strength of the edge is equal to or greater than the strength of the adjacent wall, thus reducing the probability that the edge will become a weak area in the shell and further reducing the probability that the corner position of the shell will have insufficient strength. As can be seen from this, by adopting this method, the effect of strengthening the strength of the edge is relatively good.

[0011] In some embodiments of the present application, the edge portion includes a uniform thickness portion and a gradually changing portion connected to the uniform thickness portion, the uniform thickness portion is connected to an adjacent wall portion, and the gradually changing portion is connected to the main body portion, and the wall thickness of the gradually changing portion gradually decreases in a direction away from the uniform thickness portion of the gradually changing portion.

[0012] In the above technical solution, by configuring the edge portion to include a uniform thickness portion and a gradually changing portion connected to the uniform thickness portion, the uniform thickness portion can be connected to the main body portion through the gradually changing portion with a gradual transition, which is advantageous for reducing the probability of stress concentration occurring between the main body portion and the edge portion, strengthening the structural stability of the first wall, and improving the reliability of the first wall.The gradually changing portion can also reduce the probability of sharp structures such as steps occurring between the edge portion and the main body portion, which is advantageous for reducing the probability of damage to the electrode assembly during the process of assembling the electrode assembly into the shell.

[0013] In some embodiments of the present application, the dimension of the uniform thickness portion in a direction toward the gradually changing portion of the body portion is greater than the dimension of the gradually changing portion.

[0014] In the above technical solution, the uniform thickness portion at the edge mainly plays a role in reinforcing strength, and by setting the dimension of the uniform thickness portion in the direction toward the gradually changing portion of the main body to be larger than the dimension of the gradually changing portion, the dimension occupied by the uniform thickness portion at the edge becomes larger, the effect of amplifying strength becomes significant, and an even better effect of increasing strength can be achieved.

[0015] In some embodiments of the present application, the dimension of the uniform thickness portion in the direction toward the gradually changing portion of the main body is N, the dimension of the gradually changing portion is M, and 2 mm≦N≦15 mm, 1 mm≦M≦6 mm.

[0016] In the above technical solution, by setting the dimension N of the uniform thickness portion in the direction toward the gradually changing portion 20122 of the main body portion within the range of 2 mm to 15 mm, the strength-reinforcing effect that can be brought about by the uniform thickness portion is relatively good, and the first wall has relatively high strength while reducing the impact on the electrode assembly, which is advantageous for increasing the battery energy density. By setting the dimension M of the gradually changing portion in the range of 1 mm to 6 mm, the receiving transition effect that can be brought about by the gradually changing portion between the uniform thickness portion and the main body portion is relatively good while reducing the impact on the electrode assembly, which is advantageous for increasing the battery energy density.

[0017] In some embodiments of the present application, the electrode assembly is a lithium iron phosphate electrode assembly or a ternary lithium electrode assembly, and when the electrode assembly is a lithium iron phosphate electrode assembly, 2 mm≦N≦10 mm, 1 mm≦M≦3 mm, and when the electrode assembly is a ternary lithium electrode assembly, 10 mm <N≦15mm、3mm<M≦6mmである。

[0018] In the above technical solution, when the electrode assembly is a lithium iron phosphate electrode assembly, the dimension N of the uniform thickness portion may be one of 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, and 10 mm, and the dimension M of the gradually changing portion may be one of 1 mm, 2 mm, and 3 mm. When the electrode assembly is a ternary lithium electrode assembly, the dimension N of the uniform thickness portion may be one of 11 mm, 12 mm, 13 mm, 14 mm, and 15 mm, and the dimension M of the gradually changing portion may be one of 4 mm, 5 mm, and 6 mm.

[0019] In some embodiments of the present application, a transition fillet is formed between the edge and the adjacent wall.

[0020] In the above technical solution, a transition fillet is formed between the edge and the adjacent wall, which allows for a uniform transition between the edge and the adjacent wall, which is advantageous in reducing the probability of stress concentration, improving the structural stability of the shell, and also enhancing the manufacturability of the shell.

[0021] In some embodiments of the present application, in a direction toward the edge of the body, the dimension of the edge exhibits a negative correlation with the radius of the transition fillet.

[0022] In the above technical solutions, the smaller the radius of the transition fillet, the more obvious the stress concentration between the first wall and the adjacent wall, and the higher the requirements for the strength of the first wall, so the edge dimension can be made relatively large to improve the strength of the connection between the first wall and the adjacent wall and reduce the probability of the first wall having insufficient strength.Similarly, the larger the radius of the transition fillet, the better the effect of improving the stress concentration between the first wall and the adjacent wall, and the lower the strength of the first wall, so the edge dimension can be made relatively small.

[0023] In some embodiments of the present application, the radius of the transition fillet is R, where 2 mm≦R≦4 mm.

[0024] In the above technical solution, by setting the radius R of the transition fillet within the range of 2 mm to 4 mm, the radius value of the transition fillet can be set within an appropriate range, which can better reduce the occurrence of stress concentration between the first wall and the adjacent wall, while reducing the probability of large corners occurring in the shell, which is advantageous for setting an electrode assembly with a larger volume in the shell, thereby improving the battery energy density.

[0025] In some embodiments of the present application, the electrode assembly is a lithium iron phosphate electrode assembly or a ternary lithium electrode assembly, and when the electrode assembly is a lithium iron phosphate electrode assembly, 2 mm≦R≦3 mm, and when the electrode assembly is a ternary lithium electrode assembly, 3 mm <R≦4mmである。

[0026] In the above technical solution, when the electrode assembly is a lithium iron phosphate electrode assembly, the radius R of the transition fillet may be one of 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, and 3.0 mm; when the electrode assembly is a ternary lithium electrode assembly, the radius R of the transition fillet may be one of 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, and 4.0 mm.

[0027] In some embodiments of the present application, the plurality of wall portions include a second wall, the second wall being provided at both ends of the first wall in the first direction, an electrode terminal being provided on at least one of the remaining wall portions excluding the second wall and the first wall, and an edge being provided at an end of the main body portion close to the second wall, the edge being connected to the second wall.

[0028] In the above technical solution, the first wall has edges on both ends of the main body in the first direction, and both ends of the main body in the first direction are connected to the second wall via the edges. In this way, the strength of both ends of the main body can be improved, and when the first wall is pressed, the strength at the positions where the first wall and the second wall contact each other is increased, and the strength of the entire first wall can be further improved.

[0029] In some embodiments of the present application, the plurality of wall portions includes a third wall, the third wall being provided at one end of the first wall in the second direction, the third wall and the second wall being installed adjacent to each other, and an edge being provided at an end of the main body portion close to the third wall, the edge being connected to the third wall.

[0030] In the above technical solution, both ends of the main body of the first wall can be connected to the second wall via edges, and one of the other opposing ends can also be connected to the third wall via edges. By adopting this method, except for the end of the first wall adjacent to the end cap, the remaining ends can all be connected to adjacent wall parts via edges, thereby strengthening the strength of the multiple ends of the first wall and further increasing the strength of the first wall.

[0031] In some embodiments of the present application, the wall thickness of the third wall is greater than the wall thickness of the second wall, and the electrode terminal is provided on the third wall.

[0032] In the above technical solution, the wall thickness of the third wall is set to be greater than the wall thickness of the second wall, and since the strength of the third wall is relatively high, the electrode terminal can be provided on the third wall, thereby improving the attachment reliability of the electrode terminal.

[0033] In a second aspect, embodiments of the present application further provide a battery including a battery cell as described above.

[0034] In the above technical solution, in the shell of the battery cell, the first wall includes a main body and an edge connected to the main body, the edge is connected to the adjacent wall, and the wall thickness of the edge is greater than the wall thickness of the main body. By adopting this method, the strength of the first wall can be improved, and the pressure resistance and impact resistance of the shell can be further improved, thereby improving the reliability of the battery.

[0035] In a third aspect, embodiments of the present application further provide a power consuming device including a battery cell as above or a battery as above.

[0036] In the above technical solution, the battery cell or battery has relatively high resistance to pressure and impact, so the reliability of the battery cell or battery is relatively high, which is advantageous for improving the stability of use of the power consumption device. [Brief explanation of the drawings]

[0037] In order to more clearly explain the technical solutions of the embodiments of the present application, the following briefly introduces the drawings that need to be used in the embodiments. It should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and those skilled in the art can obtain other related drawings based on these drawings without exerting any creative efforts.

[0038] [Figure 1] 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application. [Figure 2] 1 is an exploded view of a battery according to some embodiments of the present application. FIG. [Figure 3] 1 is a first schematic diagram of a shell structure according to some embodiments of the present application. [Figure 4] 2 is a second schematic diagram of a shell structure according to some embodiments of the present application. [Figure 5] 3 is a third schematic diagram of a shell structure according to some embodiments of the present application. [Figure 6] FIG. 6 is a schematic cross-sectional view taken along line AA in FIG. 5. [Figure 7] FIG. 7 is a partially enlarged schematic view of part I in FIG. 6. [Figure 8] FIG. 6 is a schematic cross-sectional view taken along line BB in FIG. 5. [Figure 9] FIG. 9 is a partially enlarged schematic view of part II in FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

[0039] In order to clarify the objectives, technical solutions and advantages of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, but it is clear that the described embodiments are only some of the embodiments of the present application and not all of the embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without any creative efforts fall within the scope of protection of the present application.

[0040] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the art. In this application, the terms used in the specification of the application are merely for the purpose of describing specific embodiments and are not intended to limit the application. The terms "comprise" and "have" and any variations thereof in the specification, claims, and description of the drawings of this application are intended to cover a non-exclusive "inclusion." The terms "first," "second," etc. in the specification, claims, or drawings of this application are intended to distinguish different objects and are not intended to describe a specific order or a subordinate relationship.

[0041] An "embodiment" referred to in this application means that a particular feature, structure, or characteristic described with reference to the embodiment may be included in at least one embodiment of this application. The appearances of the term in various places in the specification do not necessarily refer to the same embodiment, nor are they exclusive, independent, or alternative embodiments of other embodiments.

[0042] In the description of this application, it should be explained that unless otherwise clearly specified or limited, the terms "attached," "interconnected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to a fixed connection, a detachable connection, or an integral connection, a direct connection, an indirect connection via an intermediate medium, or communication between the interiors of two elements. Those skilled in the art can understand the specific meanings of the above terms in this application according to specific circumstances.

[0043] The term "and / or" in this application is merely used to describe the relationship between related objects and indicates that three relationships may exist, for example, A and / or B may represent three cases: A alone, a combination of A and B, and B alone. Also, the character " / " in this application generally indicates that the related objects before and after are in an "or" relationship.

[0044] In the embodiments of the present application, the same reference numerals represent the same elements, and for the sake of brevity, detailed descriptions of the same elements in different embodiments will be omitted. It should be understood that the thickness, length, width, and other dimensions of various elements in the embodiments of the present application, and the overall thickness, length, width, and other dimensions of the integrated device are merely illustrative and do not limit the present application.

[0045] In this application, "plurality" means two or more (including two).

[0046] In this application, the battery cells may include lithium ion secondary batteries, lithium ion primary batteries, lithium-sulfur batteries, sodium lithium ion batteries, sodium ion batteries, magnesium ion batteries, etc., and the embodiments of this application are not limited thereto. The battery cells may be cylindrical, flat, rectangular, or have other shapes, and the embodiments of this application are not limited thereto. Battery cells are generally divided into three types based on packaging methods: prismatic battery cells, rectangular battery cells, and soft-bag battery cells, and the embodiments of this application are not limited thereto.

[0047] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. The battery generally includes a housing for packaging one or more battery cells or multiple battery modules. The housing can prevent liquids or other foreign objects from affecting the charging and discharging of the battery cells.

[0048] The battery cell includes a shell, an electrode assembly, and an electrolyte. The shell is used to accommodate the electrode assembly and the electrolyte. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator. The battery cell operates primarily through the movement of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The positive electrode current collector without the positive electrode active material layer protrudes beyond the positive electrode current collector with the positive electrode active material layer coated thereon. The positive electrode current collector without the positive electrode active material layer is referred to as a positive electrode tab. Taking a lithium-ion battery as an example, the positive electrode current collector may be made of aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, or the like. The negative electrode plate includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is applied to the surface of the negative electrode current collector. The negative electrode current collector without the negative electrode active material layer protrudes beyond the negative electrode current collector with the negative electrode active material layer applied. The negative electrode current collector without the negative electrode active material layer is referred to as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon. To ensure that they do not melt even when a large current flows, the positive electrode tabs are multiple and stacked, and the negative electrode tabs are multiple and stacked.

[0049] The separator may be made of polypropylene (PP) or polyethylene (PE), etc. The electrode assembly may have a wound structure or a stacked structure, and the embodiments of the present application are not limited thereto.

[0050] In recent years, new energy vehicles have evolved dramatically, and in the field of electric vehicles, power batteries play an irreplaceable and important role as the power source for electric vehicles. A battery consists of a housing and multiple battery cells housed within the housing. As a core component of new energy vehicles, batteries have high requirements in terms of safety and repeated use life.

[0051] In a typical power battery, in order to obtain sufficient power from the battery, a plurality of battery cells are generally stacked in a battery casing, and end plates are attached to both ends of the battery cells. However, because the battery cell includes a shell, and the shell is often designed with a thin-walled structure to increase the battery energy density, when the shell is pressed by one or more of the end plates, the battery casing, and the adjacent battery cells, the shell is likely to have insufficient strength, especially at the corners of the shell, which increases the probability of shell breakage and significantly reduces the reliability of the battery cells, further affecting the reliability of the battery, causing a significant reduction in the battery's usability, and shortening the battery's service life.

[0052] Based on the above considerations, in order to solve the problem of insufficient strength of the shell of the battery cell, the inventors designed a battery cell, the battery cell including a shell, an electrode assembly, and an electrode terminal, the shell having a plurality of wall portions, the plurality of wall portions including a first wall including a main body portion and an edge portion connected to the main body portion, the edge portion being connected to an adjacent wall portion, the wall thickness of the edge portion being greater than the wall thickness of the main body portion, the electrode assembly being provided within the shell, and the electrode terminal being provided on the wall portion and electrically connected to the electrode assembly.

[0053] In a battery cell with this structure, the first wall is configured to include a main body portion and an edge portion connected to the main body portion, the edge portion is connected to an adjacent wall portion, and the wall thickness of the edge portion is greater than the wall thickness of the main body portion. By adopting this structure, regions of different thicknesses can be formed on the first wall. The main body portion is the main portion of the first wall and has a relatively small thickness, which meets the requirement for increased battery energy density. The edge portion is the portion of the first wall connected to an adjacent wall portion and has a relatively large thickness. A certain gap is generally left at the edge position of the electrode assembly and the shell, so the wall thickness of the edge portion is greater than the wall thickness of the main body portion, which can be fully utilized and does not occupy the storage space required for the electrode assembly. Meanwhile, the strength of the connection portion between the first wall and the adjacent wall portion (i.e., the corner position of the shell) can be improved, which effectively alleviates the problem of insufficient strength at the corner position of the shell when the shell is compressed. The compression resistance and impact resistance of the shell can be improved, thereby improving the reliability of the battery cell and battery.

[0054] The batteries disclosed in the embodiments of the present application may be used in power consumption devices such as, but not limited to, vehicles, ships, and aircraft, etc. A power supply system including the power consumption device configured with the battery cells, batteries, etc. disclosed in the present application can be used, thus advantageously increasing the application range of the battery cells.

[0055] An embodiment of the present application provides a power-consuming device that uses a battery or battery cell as a power source, and the power-consuming device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, an electric bicycle, an electric car, a steamship, a spaceship, etc. The electric toy may be a stationary or mobile electric toy, such as a game console, an electric car toy, an electric steamship toy, an electric plane toy, etc., and the spaceship may include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0056] In the following embodiment, for convenience of explanation, the power consumption device of one embodiment of the present application is a vehicle 1000 as an example.

[0057] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a gasoline-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extended vehicle, etc. A battery 100 is installed inside the vehicle 1000, and the battery 100 may be located at the bottom, head, or rear of the vehicle 1000. The battery 100 may be used to supply power to the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, and the controller 200 is used to control the power supply from the battery 100 to the motor 300, for example, for operating power needs during startup, navigation, and driving of the vehicle 1000.

[0058] In some embodiments of the present application, the battery 100 can not only function as an operating power source for the vehicle 1000, but can also provide driving power for the vehicle 1000 as a power source for driving the vehicle 1000, as an alternative or partial alternative to gasoline or natural gas.

[0059] Referring to FIG. 2, FIG. 2 is a structural exploded view of a battery 100 according to some embodiments of the present application. The battery 100 includes a housing 10 and a plurality of battery cells 20, which are adapted to be housed within the housing 10. The housing 10 is adapted to provide an assembly space for the battery cells 20, and the housing 10 may adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which are joined to each other, and the first housing body 11, together with the second housing body 12, define an assembly space for housing the battery cells 20. The second housing body 12 may have a hollow structure with one end open, and the first housing body 11 may have a plate-like structure, and the first housing body 11 is placed over the open side of the second housing body 12 to define an assembly space together with the second housing body 12. The first housing body 11 and the second housing body 12 may both have a hollow structure with one end open, and the open side of the first housing body 11 may be placed over the open side of the second housing body 12. Of course, the housing 10 formed by the first housing body 11 and the second housing body 12 may have various shapes, such as a cylindrical body or a rectangular parallelepiped.

[0060] In the battery 100, the plurality of battery cells 20 may be connected in series, in parallel, or in series-parallel, and a series-parallel connection means that the plurality of battery cells 20 are not only connected in series but also in parallel. The plurality of battery cells 20 may be directly connected in series, in parallel, or in series-parallel, and then the entire battery cell 20 may be housed in the housing 10. Of course, the battery 100 may be configured such that the plurality of battery cells 20 are first connected in series, in parallel, or in series-parallel to form a battery module, and then the plurality of battery modules are further connected in series, in parallel, or in series-parallel to form a whole and housed in the housing 10. The battery 100 may further include other structures; for example, the battery 100 may further include bus bar members for electrically connecting the plurality of battery cells 20.

[0061] In some embodiments, the battery 100 includes multiple rows of battery cells 20, which may be arranged along the longitudinal direction of the housing 10, with each row of battery cells 20 including multiple battery cells 20 arranged along the width direction of the housing 10, or the multiple rows of battery cells 20 may be arranged along the width direction of the housing 10, with each row of battery cells 20 including multiple battery cells 20 arranged along the longitudinal direction of the housing 10.

[0062] Each battery cell 20 may be a secondary battery or a primary battery, including, but not limited to, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cells 20 may be cylindrical, flat, rectangular, or have other shapes. For example, the battery cells 20 are cylindrical.

[0063] According to some embodiments of the present application, referring to FIG. 3, FIG. 3 is a battery cell 20 according to some embodiments of the present application, which includes a shell 21, an electrode assembly (not shown), and an electrode terminal (not shown), the shell 21 includes a plurality of wall portions 211, the plurality of wall portions 211 including a first wall 201, the first wall 201 including a main body portion 2011 and an edge portion 2012 connected to the main body portion 2011, the edge portion 2012 being connected to an adjacent wall portion 211, the wall thickness of the edge portion 2012 being greater than the wall thickness of the main body portion 2011, the electrode assembly being provided within the shell 21, and the electrode terminal being provided on the wall portion 211 and electrically connected to the electrode assembly.

[0064] The shell 21 is a thin-walled shell structural member for housing the electrode assembly and the electrolyte. The shell 21 may be made of, but is not limited to, an aluminum shell or a steel shell. The shell 21 has a plurality of wall portions 211, which are connected to each other and jointly define a housing space for housing the electrode assembly and the electrolyte. The first wall 201 may be a wall portion 211 that requires increased strength. The main body portion 2011 may refer to the main body portion of the first wall 201, and the edge portion 2012 may refer to an edge portion of the first wall 201. For example, the edge portion 2012 may be provided at at least one end of the main body portion 2011. Because the wall thickness of the edge portion 2012 is greater than the wall thickness of the main body portion 2011 and is connected to an adjacent wall 211, the edge portion 2012 can serve to increase the strength at the connection position between the first wall 201 and the adjacent wall 211.

[0065] The electrode terminal may refer to a member connected to the external conductor of the electrode assembly. Exemplarily, the electrode terminal may refer to a post. There are at least two electrode terminals, including a positive terminal and a negative terminal, which are connected to the positive and negative poles of an external electrical device.

[0066] In the above technical solution, the first wall 201 is configured to include a main body 2011 and an edge 2012 connected to the main body 2011, the edge 2012 is connected to the adjacent wall 211, and the wall thickness of the edge 2012 is greater than the wall thickness of the main body 2011. By adopting this structure, regions of different thicknesses can be formed on the first wall 201, the main body 2011 is the main body part of the first wall 201, and has a relatively small thickness, which can meet the requirement of increasing battery energy density, and the edge 2012 is the part of the first wall 201 connected to the adjacent wall 211, and has a relatively large thickness, which can form an electrode adhesive. Generally, a certain gap is left between the assembly and the edge of the shell 21. This allows the wall thickness of the edge 2012 to be greater than the wall thickness of the main body 2011, and this gap can be fully utilized without occupying the storage space required for the electrode assembly. At the same time, the strength of the connection between the first wall 201 and the adjacent wall 211 (i.e., the corner positions of the shell 21) can be improved, which effectively alleviates the problem of insufficient strength at the corner positions of the shell 21 when the shell 21 is compressed. The compression resistance and impact resistance of the shell 21 can be improved, thereby improving the reliability of the battery cell 20 and the battery 100.

[0067] 3 and 5, the area of ​​the first wall 201 is larger than the area of ​​the remaining wall portions 211. The first wall 201 may be understood to refer to a larger wall on the shell 21, and its strength is lower than that of the other wall portions 211, that is, a relatively thin wall portion 211 on the shell 21. For example, if the shell 21 is a rectangular aluminum shell, the first wall 201 may refer to two side walls with larger areas.

[0068] In the above technical solution, the area of ​​the first wall 201 is set to be larger than the area of ​​the remaining wall portion 211, i.e., the first wall 201 is the larger wall of the shell 21. By adopting this method, the strength of the larger wall can be effectively improved, further increasing the strength of the entire shell 21. While the larger wall can meet the strength requirements, the wall thickness of the main body portion 2011 of the larger wall can be made relatively thin, which saves material, increases the accommodation space for the electrode assembly within the shell 21, and further increases the volume of the electrode assembly, which is beneficial to increasing the battery energy density of the battery cell 20.

[0069] In some embodiments of the present application, the wall thickness of at least a portion of the edge 2012 is equal to or greater than the wall thickness of the adjacent wall 211 .

[0070] It may also be understood that the wall thickness of at least a portion of the edge portion 2012 may be equal to or greater than the wall thickness of the adjacent wall portion 211 (see FIG. 7, where the wall thickness of the adjacent wall portion 211 is T1 and the wall thickness of at least a portion of the edge portion 2012 is T3, where T1 and T3 are equal), and by adopting this method, a relatively uniform transition can be achieved between the edge portion 2012 and the adjacent wall portion 211, improving the manufacturability of the shell 21, and the wall thickness of the edge portion 2012 can be equal to the wall thickness of the adjacent wall portion 211, making the strength of both the edge portion 2012 and the adjacent wall portion 211 relatively high, further increasing the strength of the entire shell 21.

[0071] The wall thickness of at least a portion of the edge portion 2012 may be greater than the wall thickness of the adjacent wall portion 211. By adopting this method, the strength of the edge portion 2012 is greater than the strength of the main body portion 2011 and the adjacent wall portion 211. In this way, the edge portion 2012 has a relatively high strength, and when the shell 21 is pressed, the pressing and impact resistance effects at the corner position are relatively good.

[0072] In the above technical solution, the wall thickness of at least a part of the edge portion 2012 is set to be equal to or greater than the wall thickness of the adjacent wall portion 211, so that the wall thickness of the edge portion 2012 is equal to or greater than the wall thickness of any one of the multiple wall portions 211, that is, the strength of the edge portion 2012 is equal to or greater than the strength of the adjacent wall portion 211. In this way, the probability that the edge portion 2012 will become a weak area in the shell 21 can be reduced, and further the probability that the corner positions of the shell 21 will have insufficient strength can be reduced. From this, it can be seen that by adopting this method, the strength strengthening effect of the edge portion 2012 is relatively good.

[0073] In some embodiments of the present application, as shown in Figures 7 and 9, the edge portion 2012 includes a uniform thickness portion 20121 and a gradually changing portion 20122 connected to the uniform thickness portion 20121, the uniform thickness portion 20121 is connected to the adjacent wall portion 211, and the gradually changing portion 20122 is connected to the main body portion 2011, and the wall thickness of the gradually changing portion 20122 gradually decreases in a direction away from the uniform thickness portion 20121 of the gradually changing portion 20122.

[0074] The uniform thickness portion 20121 may refer to a portion of the edge portion 2012 that has a uniform and equal thickness.

[0075] The gradually changing portion 20122 may refer to a portion of the edge portion 2012 where the thickness gradually changes.

[0076] 3 to 7, the shell 21 may have a first direction X, a second direction Y, and a third direction Z, where each of the first direction X, the second direction Y, and the third direction Z is perpendicular to one another, and the first direction X, the second direction Y, and the third direction Z may correspond to one of the longitudinal direction, the width direction, and the height direction of the shell 21. An end of the first wall 201 in the first direction X and an end of the third direction Z are connected to the wall portion 211. Referring to FIGS. 6 and 7, in the first wall 201, an end of the main body portion 2011 in the third direction Z is connected to the wall portion 211 via an edge portion 2012, and the gradually changing portion 20122 may extend in the third direction Z in a direction away from the uniform thickness portion 20121. The wall thickness of the gradually changing portion 20122 may refer to the dimension along the first direction X. 8 and 9, in the first wall 201, the end of the main body portion 2011 in the first direction X is connected to the wall portion 211 via the edge portion 2012, and the direction away from the uniform thickness portion 20121 of the gradually changing portion 20122 may be arranged along the first direction X, and the wall thickness of the gradually changing portion 20122 may refer to the dimension along the second direction Y.

[0077] The surface of the gradually changing portion 20122 located inside the shell 21 may include, but is not limited to, a sloped surface and an arcuate surface.

[0078] In the above technical solution, the edge portion 2012 is configured to include the uniform thickness portion 20121 and the gradually changing portion 20122 connected to the uniform thickness portion 20121, so that the uniform thickness portion 20121 can be connected to the main body portion 2011 with a gradual transition via the gradually changing portion 20122, which is advantageous for reducing the probability of stress concentration occurring between the main body portion 2011 and the edge portion 2012, strengthening the structural stability of the first wall 201, and improving the reliability of the first wall 201. Furthermore, the gradually changing portion 20122 can also reduce the probability of a sharp structure such as a step occurring between the edge portion 2012 and the main body portion 2011, which is advantageous for reducing the probability of damage to the electrode assembly during the process of assembling the electrode assembly into the shell 21.

[0079] In some embodiments of the present application, as shown in FIGS. 7 and 9, the dimension N of the uniform thickness portion 20121 in the direction toward the gradually changing portion 20122 of the main body portion 2011 is greater than the dimension M of the gradually changing portion 20122.

[0080] 6 and 7, in the first wall 201, an end of the main body portion 2011 in the third direction Z is connected to the wall portion 211 via an edge portion 2012, and the direction of the main body portion 2011 toward the gradually changing portion 20122 may be along the third direction Z. With reference to FIGS. 8 and 9, in the first wall 201, an end of the main body portion 2011 in the first direction X is connected to the wall portion 211 via an edge portion 2012, and the direction of the main body portion 2011 toward the gradually changing portion 20122 may be along the first direction X.

[0081] In the above technical solution, the uniform thickness portion 20121 in the edge portion 2012 mainly plays a role in strengthening strength. By setting the dimension N of the uniform thickness portion 20121 in the direction toward the gradually changing portion 20122 of the main body portion 2011 to be larger than the dimension M of the gradually changing portion 20122, the dimension occupied by the uniform thickness portion 20121 in the edge portion 2012 becomes larger, the effect of increasing strength becomes significant, and an even better effect of increasing strength can be achieved.

[0082] In some embodiments of the present application, as shown in Figures 7 and 9, the dimension of the uniform thickness portion 20121 in the direction toward the gradually changing portion 20122 of the main body portion 2011 is N, the dimension of the gradually changing portion 20122 is M, and 2 mm ≦ N ≦ 15 mm, 1 mm ≦ M ≦ 6 mm.

[0083] The dimension N of the uniform thickness portion 20121 may include, but is not limited to, any one of 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, and 15 mm. In this solution, if the dimension N of the uniform thickness portion 20121 is less than 2 mm, the potential strength-enhancing effect is relatively poor, which is unfavorable for significantly increasing the strength of the first wall 201. If the dimension N of the uniform thickness portion 20121 is greater than 15 mm, a good strength-enhancing effect can be achieved, but the relatively large dimension N of the uniform thickness portion 20121 increases the impact on the electrode assembly, which is unfavorable for mounting a large-sized electrode assembly, thereby affecting the battery energy density.

[0084] The dimension M of the gradually-changing portion 20122 may include, but is not limited to, any one of 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, and 6 mm. In this solution, if the dimension M of the gradually-changing portion 20122 is smaller than 1 mm, the possible receiving transition effect is relatively poor and the effect of reducing the occurrence of stress concentration is poor. If the dimension M of the gradually-changing portion 20122 is larger than 6 mm, a good receiving transition effect can be achieved, but the dimension M of the gradually-changing portion 20122 is relatively large, which increases the impact on the electrode assembly and is disadvantageous for installing a large-sized electrode assembly, thereby affecting the battery energy density.

[0085] In the above technical solution, by setting the dimension N of the uniform thickness portion 20121 in the direction toward the gradually changing portion 20122 of the main body 2011 within the range of 2 mm to 15 mm, the strength-reinforcing effect that can be provided by the uniform thickness portion 20121 is relatively good, and the first wall 201 has a relatively high strength while reducing the impact on the electrode assembly, which is advantageous for increasing the battery energy density. By setting the dimension M of the gradually changing portion 20122 within the range of 1 mm to 6 mm, the receiving transition effect that can be provided by the gradually changing portion 20122 between the uniform thickness portion 20121 and the main body 2011 is relatively good while reducing the impact on the electrode assembly, which is advantageous for increasing the battery energy density.

[0086] In some embodiments of the present application, the electrode assembly is a lithium iron phosphate electrode assembly or a ternary lithium electrode assembly, and when the electrode assembly is a lithium iron phosphate electrode assembly, 2 mm≦N≦10 mm, 1 mm≦M≦3 mm, and when the electrode assembly is a ternary lithium electrode assembly, 10 mm <N≦15mm、3mm<M≦6mmである。

[0087] In the above technical solutions, when the electrode assembly is a lithium iron phosphate electrode assembly, the dimension N of the uniform thickness portion 20121 may be one of 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, and 10 mm, and the dimension M of the gradually changing portion 20122 may be one of 1 mm, 2 mm, and 3 mm. When the electrode assembly is a ternary lithium electrode assembly, the dimension N of the uniform thickness portion 20121 may be one of 11 mm, 12 mm, 13 mm, 14 mm, and 15 mm, and the dimension M of the gradually changing portion 20122 may be one of 4 mm, 5 mm, and 6 mm.

[0088] In some embodiments of the present application, a transition fillet 212 is formed between the edge 2012 and the adjacent wall 211, as shown in FIGS.

[0089] In the above technical solution, a transition fillet 212 is formed between the edge 2012 and the adjacent wall 211, thereby achieving a uniform transition between the edge 2012 and the adjacent wall 211, which is beneficial to reducing the probability of stress concentration, improving the structural stability of the shell 21, and also enhancing the manufacturability of the shell 21.

[0090] In some embodiments of the present application, in a direction toward the edge 2012 of the body portion 2011, the dimension of the edge 2012 is negatively correlated with the radius of the transition fillet 212. That is, the larger the radius of the transition fillet 212, the smaller the dimension of the edge 2012, and vice versa.

[0091] In the above technical solution, the smaller the radius of the transition fillet 212, the more obvious the stress concentration between the first wall 201 and the adjacent wall 211, and the higher the requirement for strength of the first wall 201. Therefore, by making the dimension of the edge 2012 relatively large, the strength of the connection between the first wall 201 and the adjacent wall 211 can be improved and the probability of insufficient strength of the first wall 201 can be reduced. Similarly, the larger the radius of the transition fillet 212, the better the effect of improving the stress concentration between the first wall 201 and the adjacent wall 211, and the lower the strength of the first wall 201. Therefore, the dimension of the edge 2012 can be relatively small.

[0092] In some embodiments of the present application, the radius of the transition fillet 212 is R, where 2 mm≦R≦4 mm.

[0093] The radius R of the transition fillet 212 may include, but is not limited to, one of 2 mm, 3 mm, and 4 mm. If the radius R of the transition fillet 212 is smaller than 2 mm, it is less effective in reducing the probability of stress concentration, and if the radius R of the transition fillet 212 is larger than 4 mm, the space at the corner positions within the shell 21 increases, and the electrode assembly needs to avoid the corner positions of the shell 21, which is disadvantageous for installing an electrode assembly with a larger volume.

[0094] In the above technical solution, by setting the radius R of the transition fillet 212 within the range of 2 mm to 4 mm, the radius value of the transition fillet 212 can be set within an appropriate range, which can better reduce the occurrence of stress concentration between the first wall 201 and the adjacent wall portion 211, and can reduce the probability of large corners occurring in the shell 21, which is advantageous for setting an electrode assembly with a larger volume in the shell 21, thereby improving the battery energy density.

[0095] In some embodiments of the present application, the electrode assembly is a lithium iron phosphate electrode assembly or a ternary lithium electrode assembly, and when the electrode assembly is a lithium iron phosphate electrode assembly, 2 mm≦R≦3 mm, and when the electrode assembly is a ternary lithium electrode assembly, 3 mm <R≦4mmである。

[0096] In the above technical solution, when the electrode assembly is a lithium iron phosphate electrode assembly, the radius R of the transition fillet 212 may be one of 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, and 3.0 mm; when the electrode assembly is a ternary lithium electrode assembly, the radius R of the transition fillet 212 may be one of 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, and 4.0 mm.

[0097] In some embodiments of the present application, as shown in FIGS. 3 , 4 , 8 and 9 , the plurality of wall portions 211 includes a second wall 202, the second wall 202 is provided at both ends of the first wall 201 in the first direction X, an electrode terminal is provided on at least one of the remaining wall portions 211 excluding the second wall 202 and the first wall 201, and an edge portion 2012 is provided at an end of the main body portion 2011 close to the second wall 202, and the edge portion 2012 is connected to the second wall 202.

[0098] It may be understood that both ends of the main body portion 2011 are connected to the second wall 202 via the edge portions 2012, and for example, there may be two first walls 201 that are installed opposite each other, and the second walls 202 are installed at both opposite ends of each first wall 201, and assuming that the shell 21 is a rectangular shell, the first walls 201 may be the two larger side walls of the shell 21, and the second walls 202 are the two smaller side walls of the shell 21. The remaining wall portions 211 excluding the second wall 202 and the first wall 201 may be the top wall and bottom wall, i.e., at least one electrode terminal may be provided on the top wall or the bottom wall of the shell 21.

[0099] In the above technical solution, in the first wall 201, edge portions 2012 are provided on both ends of the main body 2011 in the first direction X, and both ends of the main body 2011 in the first direction X are connected to the second wall 202 via the edge portions 2012. In this way, the strength of both ends of the main body 2011 can be improved, and when the first wall 201 is pressed, the strength at the contact points between the first wall 201 and the second wall 202 can be increased, and the strength of the entire first wall 201 can be further improved.

[0100] In some embodiments of the present application, as shown in Figures 3, 4, 6 and 7, the multiple wall portions 211 include a third wall 203, the third wall 203 is provided at one end of the first wall 201 in the second direction Y, the third wall 203 and the second wall 202 are installed adjacent to each other, and an edge portion 2012 is also provided at an end of the main body portion 2011 close to the third wall 203, and the edge portion 2012 is connected to the third wall 203.

[0101] 3 and 6, the shell 21 may include a shell body 2001 and an end cap (not shown), the end cap 2001 is disposed over the opening 2001a of the shell body, one of the multiple wall portions 211 is formed on the end cap and the rest are formed on the shell body 2001, the first wall 201 may be two opposing shell walls in the shell body 2001, the second wall 202 may be another two opposing shell walls in the shell body 2001, and the third wall 203 is a top wall or a bottom wall, i.e., the body portion 2011 of the first wall 201 can similarly be connected to the third wall 203 via the edge portion 2012.

[0102] In the above technical solution, in the first wall 201, both ends of the main body 2011 can be connected to the second wall 202 via the edge 2012, and one of the other opposing ends can also be connected to the third wall 203 via the edge 2012. By adopting this method, in addition to the end adjacent to the end cap in the first wall 201, the remaining ends can all be connected to the adjacent wall 211 via the edge 2012, thereby strengthening the strength of the multiple ends of the first wall 201 and further increasing the strength of the first wall 201.

[0103] In some embodiments of the present application, as shown in FIGS. 7 and 9, the wall thickness of the third wall 203 is greater than the wall thickness of the second wall 202, and the electrode terminal is provided on the third wall 203.

[0104] Referring to the above, the third wall 203 may refer to the wall portion 211 facing the opening 2001 a of the shell body 2001, for example, the third wall 203 is a bottom wall. The third wall 203 may also refer to the wall portion 211 that fits with the opening 2001 a of the shell body 2001, for example, the third wall 203 is a top wall. Referring to Figures 7 and 9, the wall thickness of the third wall 203 may be T1, and the wall thickness of the second wall 202 may be T4, where T1 is greater than T4.

[0105] Optionally, via holes 203a may be provided on the third wall 203, and the electrode terminals are drilled in the via holes 203a. The number of the via holes 203a is equal to the number of the electrode terminals and corresponds to one another, for example, if there are two electrode terminals, there will be two via holes 203a.

[0106] Optionally, a pressure relief portion 22 may be provided on the third wall 203, and the pressure relief portion 22 is an explosion-proof valve.

[0107] In the above technical solution, the wall thickness of the third wall 203 is set to be greater than the wall thickness of the second wall 202, and since the strength of the third wall 203 is relatively high, the electrode terminal can be provided on the third wall 203, thereby improving the attachment reliability of the electrode terminal.

[0108] According to an embodiment of the present application, the shell 21 of the battery cell 20 is an aluminum shell, and the first wall 201 of the aluminum shell is a larger wall, and the wall thickness at the boundary corner between the larger wall and the adjacent smaller wall is uniformly thinned from 0.5 mm to 0.3 mm, and the wall thickness at the boundary corner between the larger wall and the adjacent smaller wall is equal (see thickness T4 in Figure 9), which improves the shell strength when pressed by the module end plate.

[0109] According to another embodiment of the present application, the shell 21 of the battery cell 20 is an aluminum shell, and the first wall 201 of the aluminum shell is a larger wall, and the wall thickness at the corner where the larger wall meets the adjacent top wall is uniformly thinned from 1.5 mm to 0.3 mm (see FIG. 7, the wall thickness T3 is 1.5 mm, and the wall thickness T2 is 0.3 mm), and the wall thickness at the corner where the larger wall meets the adjacent top wall is equal (see thickness T1 in FIG. 7), thereby improving the impact resistance when pressed by the module end plate.

[0110] In a second aspect, an embodiment of the present application further provides a battery 100 including the battery cell 20 as described above.

[0111] In the above technical solution, in the shell 21 of the battery cell 20, the first wall 201 includes a main body 2011 and an edge 2012 connected to the main body 2011, the edge 2012 is connected to the adjacent wall 211, and the wall thickness of the edge 2012 is greater than the wall thickness of the main body 2011. By adopting this method, the strength of the first wall 201 can be improved, and the pressure resistance and impact resistance of the shell 21 can be further improved, thereby improving the reliability of the battery 100.

[0112] In a third aspect, embodiments of the present application further provide a power consuming device including a battery cell 20 as above or a battery 100 as above.

[0113] In the above technical solution, the battery cell 20 or the battery 100 has relatively high resistance to pressure and impact, so the reliability of the battery cell 20 or the battery 100 is relatively high, which is advantageous for improving the stability of use of the power consumption device.

[0114] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other.

[0115] The above is only a preferred embodiment of the present application, and is not intended to limit the present application, and those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the scope of the concept and principles of the present application shall be included within the protection scope of the present application. [Explanation of symbols]

[0116] 1000, vehicle, 100, battery, 10, housing, 11, first housing body, 12, second housing body, 20, battery cell, 21, shell, 211, wall portion, 201, first wall, 2011, main body portion, 2012, edge portion, 20121, uniform thickness portion, 20122, gradually changing portion, 202, second wall, 203, third wall, 203a, via hole, 212, transition fillet, 22, pressure relief portion, 2001, shell body, 2001a, opening, 200, controller, 300, motor, X, first direction, Y, second direction, Z, third direction.

Claims

1. a shell having a plurality of walls, the plurality of walls including a first wall having a body portion and an edge portion connected to the body portion, the edge portion being connected to an adjacent wall portion, the wall thickness of the edge portion being greater than the wall thickness of the body portion; an electrode assembly disposed within the shell; an electrode terminal provided on the wall portion and electrically connected to the electrode assembly; Battery cell.

2. The battery cell of claim 1 , wherein the area of ​​the first wall is greater than the area of ​​the remaining wall portions.

3. The battery cell according to claim 1 or 2, wherein a wall thickness of at least a part of the edge portion is equal to or greater than a wall thickness of an adjacent wall portion.

4. 4. The battery cell according to claim 1, wherein the edge portion includes a uniform thickness portion and a gradually changing portion connected to the uniform thickness portion, the uniform thickness portion is connected to an adjacent wall portion, the gradually changing portion is connected to the main body portion, and the wall thickness of the gradually changing portion gradually decreases in a direction away from the uniform thickness portion of the gradually changing portion.

5. The battery cell according to claim 4 , wherein a dimension of the uniform thickness portion in a direction toward the gradually changing portion of the main body portion is larger than a dimension of the gradually changing portion.

6. a dimension of the uniform thickness portion in a direction toward the gradually changing portion of the main body portion is N, and a dimension of the gradually changing portion is M; 6. The battery cell according to claim 5, wherein 2 mm≦N≦15 mm and 1 mm≦M≦6 mm.

7. the electrode assembly is a lithium iron phosphate electrode assembly or a ternary lithium electrode assembly; When the electrode assembly is a lithium iron phosphate electrode assembly, 2 mm≦N≦10 mm, 1 mm≦M≦3 mm; 7. The battery cell of claim 6, wherein when the electrode assembly is the ternary lithium electrode assembly, 10 mm<N≦15 mm, 3 mm<M≦6 mm.

8. The battery cell of claim 1 , wherein a transition fillet is formed between the edge and the adjacent wall.

9. 9. The battery cell of claim 8, wherein in a direction toward the edge of the body portion, the dimension of the edge exhibits a negative correlation with the radius of the transition fillet.

10. 10. The battery cell of claim 8 or 9, wherein the radius of the transition fillet is R, and 2 mm≦R≦4 mm.

11. the electrode assembly is a lithium iron phosphate electrode assembly or a ternary lithium electrode assembly; When the electrode assembly is a lithium iron phosphate electrode assembly, 2 mm≦R≦3 mm; 11. The battery cell of claim 10, wherein when the electrode assembly is the ternary lithium electrode assembly, 3 mm<R≦4 mm.

12. 12. The battery cell of claim 1, wherein the plurality of wall portions include a second wall, the second wall being provided at both ends of the first wall in the first direction, the electrode terminal being provided on at least one of the remaining wall portions excluding the second wall and the first wall, and the edge portion being provided at an end of the main body portion close to the second wall, and the edge portion being connected to the second wall.

13. 13. The battery cell of claim 12, wherein the plurality of wall portions include a third wall, the third wall being provided at one end of the first wall in the second direction, the third wall and the second wall being installed adjacent to each other, and the edge portion being also provided at an end of the main body portion close to the third wall, and the edge portion being connected to the third wall.

14. The battery cell according to claim 13 , wherein a wall thickness of the third wall is greater than a wall thickness of the second wall, and the electrode terminal is provided on the third wall.

15. A battery comprising the battery cell of any one of claims 1 to 14.

16. 16. A power consuming device comprising a battery cell according to any one of claims 1 to 14 or a battery according to claim 15.

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