Battery cell, battery, and power consumption device

Abstract

Embodiments of the present application provide a battery cell including a case, an end cap, and electrode terminals, a battery, and a power consumption device. The case has an opening, the end cap is used to cover the opening, the electrode terminals are provided on the case, and the end cap is the wall with the largest area of the battery cell. By providing the end cap as the wall with the largest area in the battery cell, the area of the opening can be increased, the structure inside the battery cell can easily enter the case, the assembly speed during assembly is accelerated, and further the production efficiency of the battery cell is enhanced.

Description

Technical Field

[0001] Cross - reference to Related Applications This application claims the priority of Chinese Patent Application No. 202221856857.X, titled "Battery Cell, Battery and Power - consuming Device", filed on July 19, 2022, and all the contents of the said application are incorporated herein by reference.

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

Background Art

[0003] As the consumption of natural resources and environmental destruction become increasingly serious, in each field, there has been an increasing interest in devices that can store energy and effectively utilize the stored energy. A battery cell is a system that can utilize new renewable energy in combination with each other.

[0004] In the technical field of battery equipment, the production efficiency of battery cells is low.

Summary of the Invention

[0005] Embodiments of the present application provide a battery cell, a battery and a power - consuming device that can facilitate the assembly and shaping of the battery cell and improve the production efficiency of the battery cell.

[0006] According to a first aspect of the embodiments of the present application, a battery cell including a case, an end cap and an electrode terminal is provided. The case has an opening, the end cap is used to cover the opening, the electrode terminal is provided on the case, and the end cap is the wall with the largest area of the battery cell.

[0007] By adopting the above structure, by providing the end cap as the wall with the largest area in the battery cell, the area of the opening can be increased, the structure inside the battery cell can be easily placed into the case, and at the same time, by providing the electrode terminal on the case, the assembly speed during assembly can be accelerated, and furthermore, the production efficiency of the battery cell can be enhanced.

[0008] In some alternative embodiments of the present application, the battery cell further includes an electrode assembly, the electrode assembly is provided in the case, the electrode assembly includes a main body portion and tabs extending from the main body portion, and the arrangement direction of the tabs and the main body portion is perpendicular to the thickness direction of the end cap.

[0009] By adopting the above structure, by making the arrangement direction of the tabs and the main body portion perpendicular to the thickness direction of the end cap, the space occupied by the tabs is reduced, and the energy density is increased.

[0010] In some alternative embodiments of the present application, the case includes a first wall and a second wall that intersect, the area of the second wall is larger than the area of the first wall and smaller than the area of the end cap, the electrode terminal is provided on the first wall, and the end face from which the tabs of the main body portion extend faces the second wall.

[0011] By adopting the above structure, the infiltration area of the electrode assembly can be made as large as possible, and the infiltration effect can be enhanced.

[0012] In some alternative embodiments of the present application, the battery cell further includes a connecting member for connecting the electrode terminal and the tab.

[0013] By adopting the above structure, by providing the connecting member, the tabs can be easily connected to the electrode terminals.

[0014] In some alternative embodiments of the present application, the connecting member includes a first connecting portion for connecting to the electrode terminal and a second connecting portion for connecting to the tab.

[0015] By adopting the above structure, by providing the first connection part and the second connection part, the parts of the connection member connected to the electrode terminal and the tab can be made relatively independent, and it becomes easier to provide a structure for connecting the connection member to the electrode terminal and the tab.

[0016] In some alternative embodiments of the present application, the connection member is L-shaped.

[0017] By adopting the above structure, by providing the connection member in an L-shape, it becomes easier to provide the connection member at the corner where the first wall and the second wall intersect, the remaining space in the case is fully utilized, and the energy density of the battery cell is increased.

[0018] In some alternative embodiments of the present application, along the thickness direction of the end cap, the case has two oppositely provided openings, the battery cell includes two of the end caps, and the two end caps are provided corresponding to the two openings.

[0019] By adopting the above structure, by providing two openings, the operation space during assembly in the case can be further enlarged, and the assembly efficiency can be increased.

[0020] In some alternative embodiments of the present application, along the thickness direction of the second wall, the dimension of the main body part of the electrode assembly is H1, the dimension of the case is H2, and H1 / H2≥0.8 is satisfied.

[0021] By adopting the above structure, by limiting the ratio of H1 / H2, the main body part occupies the internal space of the battery cell as much as possible, the space occupied by other members (such as the connection member) of the battery cell is reduced, and the space utilization rate and energy density of the battery cell can be increased.

[0022] In some alternative embodiments of the present application, the electrode assembly is a wound electrode assembly. Along a first direction, the dimension of the electrode assembly is L, satisfying 300 mm ≤ L ≤ 800 mm, and the first direction is perpendicular to the thickness direction of the end cap and the thickness direction of the second wall.

[0023] By adopting the above structure, by limiting the dimension of the electrode assembly in the first direction, it is possible to reduce the problem that L is too small and the energy density of the battery cell is low, and it is also possible to reduce the problem that L is too large and the processing difficulty of the electrode assembly increases, resulting in a decrease in the production efficiency of the electrode assembly.

[0024] In some alternative embodiments of the present application, along the thickness direction of the end cap, the dimension of the electrode assembly is D, satisfying 10 mm ≤ D ≤ 80 mm.

[0025] By adopting the above structure, by limiting the dimension of the electrode assembly in the thickness direction, it is possible to reduce the problem that D is too small and the energy density of the battery cell is low, and it is also possible to reduce the problem that D is too large and the processing difficulty of the electrode assembly increases, resulting in a decrease in the production efficiency of the electrode assembly.

[0026] According to a second aspect of the embodiments of the present application, a battery including the above battery cell is provided.

[0027] According to a third aspect of the embodiments of the present application, a power consumption device including the above battery cell and providing electrical energy is provided.

[0028] Compared with the related art, in the battery cell, battery, and power consumption device of the embodiments of the present application, by providing the end cap as the wall with the largest area in the battery cell, the area of the opening can be increased, the structure inside the battery cell can more easily enter the case, the assembly speed during assembly is accelerated, and furthermore, the production efficiency of the battery cell is improved.

Brief Description of the Drawings

[0029] To more clearly explain the technical solutions of the embodiments of the present application, the drawings necessary for use in the embodiments of the present application will be briefly described below. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative efforts.

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Modes for Carrying Out the Invention

[0030] To more clearly 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 of the embodiments of the present application. It is obvious that the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0031] Hereinafter, embodiments of the technical solution of the present application will be described in detail with reference to the drawings. The following embodiments are merely examples for more clearly explaining the technical solution of the present application, and thus should not be used to limit the protection scope of the present application.

[0032] Unless otherwise defined, all technical terms and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the art. The terms used in this specification are merely for the purpose of describing specific embodiments and are not intended to limit the present application. The terms "including" and "having" and any variations thereof in the description of the specification, claims and drawings of the present application are intended to cover the non-exclusive "including".

[0033] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and should not be understood as indicating or implying relative importance, or indicating the number of technical features, specific order or primary-secondary relationship.

[0034] When referring to "embodiments" in this specification, it means that specific features, structures or characteristics described in accordance with the embodiments may be included in at least one embodiment of the present application. This phrase described in each part of the specification does not necessarily refer to the same embodiment, nor is it an exclusive, separate or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art can clearly and implicitly understand that the embodiments described in this specification can be combined with other embodiments.

[0035] In the description of the embodiments of the present application, the term "and / or" is only used to describe the relationship of related objects and represents that three relationships may exist. For example, A and / or B can represent three cases: A alone, the combination of A and B, and B alone. Also, the character " / " in this specification generally represents that the related objects before and after are in an "or" relationship.

[0036] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), similarly, "plural groups" refers to two groups or more (including two groups), and "plural sheets" refers to two sheets or more (including two sheets).

[0037] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal direction", "lateral direction", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial direction", "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description and simplifying the description of the embodiments of the present application, and does not indicate or imply that the indicated device or element must have a specific orientation and be configured and operate in a specific orientation. Therefore, it should not be understood as limiting the embodiments of the present application.

[0038] In the description of the embodiments of the present application, unless otherwise clearly defined and limited, technical terms such as "attach", "connect", "connect", "fix", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or the communication inside two elements or the interaction relationship between two elements. A person skilled in the art can understand the specific meaning of the above terms in the embodiments of the present application according to the specific situation.

[0039] In the development of battery technology, it is necessary to consider not only various design elements, but also the battery production process such as production efficiency and production safety at the same time. The production efficiency in battery production has already become one of the important obstacles restricting the further development of batteries.

[0040] The inventor noticed that the battery cell includes a case for forming an accommodation space, and an opening for placing the internal structure of the battery cell into the accommodation space is usually provided in the case. However, in order to improve the energy density of the battery cell, the internal structure of the battery cell is relatively compact, and the difficulty level of the assembly process when the internal structure enters the case is high, which seriously affects the production efficiency of the battery cell.

[0041] In order to reduce the technical problem of low production efficiency of the battery cell, the inventor conducted research and found that by adjusting the installation position of the opening in the case and expanding the passing area of the opening, the internal structure of the battery cell can easily enter the case, accelerating the assembly speed and increasing the production efficiency of the battery cell.

[0042] Based on the above considerations, the inventor of the present application conducted repeated research and designed a battery cell, a battery, and a power consumption device.

[0043] The embodiments of the present application provide a power consumption device that uses a battery as a power source. The power consumption device may be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, a power tool, an electric bicycle, an electric vehicle, a ship, an aircraft, etc. The electric toy may include fixed or mobile electric toys such as a game console, an electric vehicle toy, an electric propulsion ship toy, and an electric airplane toy. The aircraft may include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0044] In some embodiments, the battery may be an energy storage device. The energy storage device includes an energy storage container, an energy storage electric cabinet, etc.

[0045] In the following embodiments, for the sake of easy explanation, the case where the power consumption device according to an embodiment of the present application is the vehicle 1000 will be described as an example.

[0046] As shown in FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 may be a gasoline vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a secondary battery electric vehicle, a hybrid electric vehicle, an extended-range electric vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000. For example, the battery 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used to meet the needs of the vehicle 1000 for starting, navigation, and operating power during driving.

[0047] In some embodiments of the present application, the battery 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000 to provide driving power to the vehicle 1000 instead of gasoline or natural gas, or instead of a part of them.

[0048] The battery mentioned in the embodiments of the present application refers to a single physical assembly including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application can include a battery assembly, a battery pack, etc.

[0049] As shown in FIG. 2, FIG. 2 is a schematic structural diagram of a battery 100 provided by some embodiments of the present application. In some embodiments of the present application, the battery 100 includes a box 110, and the box 110 can include a first box part 111 and a second box part 112 that are connected to each other. After a plurality of battery cells are connected in parallel or in series or in series-parallel combination and combined, they are placed in the space formed after the first box part 111 and the second box part 112 are connected. The shapes of the first box part 111 and the second box part 112 can be determined according to the shape of the combination of the plurality of battery cells. The battery cell may exhibit a flat body, a rectangular shape, or other shapes, etc., but in the embodiments of the present application, it is not limited thereto. The packaging method of the battery cell includes, but is not limited to, cylindrical battery cells, square battery cells, soft pack battery cells, etc., and in the embodiments of the present application, it is not specifically limited thereto. Further, the battery 100 can further include other structures such as a bus bar member for realizing electrical connection between a plurality of battery cells, which will not be described in detail here one by one.

[0050] FIG. 3 is a schematic structural diagram of a battery cell provided by some embodiments of the present application, and FIG. 4 is a schematic structural diagram of a battery cell provided by some other embodiments of the present application. As shown in FIGS. 3 and 4, according to some alternative embodiments of the present application, a battery cell 10 including a case 1, an end cap 2, and an electrode terminal 3 is provided. The case 1 has an opening 11, the end cap 2 is used to cover the opening 11, the electrode terminal 3 is provided on the case 1, and the end cap 2 is the wall with the largest area of the battery cell.

[0051] The case 1 is an assembly for forming an accommodation space of the battery cell, and the formed accommodation space can be used to accommodate the internal structure of the battery cell. Exemplarily, the shape of the case 1 can be determined according to the specific shape of the electrode assembly 4. The case 1 may be made of various materials such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not particularly limit this.

[0052] The electrode terminal 3 is used for external electrical connection and is used to draw electrical energy out of the battery cell 10 or introduce it into the battery cell 10. Exemplarily, one end of the electrode terminal 3 is provided inside the case 1 and connected to the internal structure of the battery cell 10, and the other end is provided outside the case 1.

[0053] The end cap 2 is used to cover the opening 11 of the case 1 and to form a seal connection to form a sealed space for accommodating the internal structure of the battery cell.

[0054] By providing the end cap 2 as the wall with the largest area in the battery cell 10, the area of the opening 11 can be increased, the structure inside the battery cell 10 can more easily enter the case 1, the assembly speed during assembly is accelerated, and furthermore, the production efficiency of the battery cell 10 is increased.

[0055] Referring to FIGS. 3 and 4, optionally, the case 1 may be a hollow structure having an opening 11 on one side, or may be a hollow structure having openings 11 on both opposite sides. Exemplarily, taking a rectangular battery as an example, the opening 11 of the case 1 is provided on one of the walls or two walls with the largest area in the rectangular battery, and the end cap 2 covers the opening 11. Exemplarily, the aforementioned wall refers to a wall-like structure that surrounds to form a space. For example, a square battery cell has six walls. Exemplarily, when two openings 11 are provided, two end caps 2 may also be provided. One end cap 2 correspondingly covers one opening 11 of the case 1 to form a seal connection, thereby forming a sealed space for accommodating the internal structure of the battery cell 10.

[0056] Referring to FIGS. 3 and 4, optionally, the area of the end cap 2 is larger than the area of each of the remaining surfaces of the battery cell. Exemplarily, taking a rectangular battery as an example, the end cap 2 may completely cover the wall with the largest area in the rectangular battery, or may partially cover the wall with the largest area in the rectangular battery.

[0057] Optionally, the electrode terminal 3 can include a positive electrode terminal and a negative electrode terminal, and the positive electrode terminal and the negative electrode terminal are respectively used to be electrically connected to the positive electrode tab and the negative electrode tab of the electrode assembly.

[0058] FIG. 5 is a schematic side structure diagram of a battery cell provided by some embodiments of the present application. FIG. 6 is a schematic cross-sectional diagram taken along A-A in FIG. 5. FIG. 7 is an enlarged schematic diagram at the first wall 12 in FIG. 6. FIG. 8 is an enlarged schematic diagram at the electrode terminal 3 in FIG. 6. As shown in FIGS. 3, 5 to 8, in some alternative embodiments of the present application, the battery cell further includes an electrode assembly 4, the electrode assembly 4 is provided in the case 1, the electrode assembly 4 includes a main body portion 41 and tabs 42 extending from the main body portion 41, and the arrangement direction of the tabs 42 and the main body portion 41 (the y-axis direction in the figure) is perpendicular to the thickness direction of the end cap 2 (the x-axis direction in the figure).

[0059] The electrode assembly 4 refers to an assembly for electrochemical reaction in the battery cell. Exemplarily, the electrode assembly 4 is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and a separator is usually provided between the positive electrode plate and the negative electrode plate. The portions of the positive electrode plate and the negative electrode plate having the active material constitute the main body portion 41 of the electrode assembly 4, and the portions of the positive electrode plate and the negative electrode plate not having the active material respectively constitute the tabs 42. During the charge and discharge process of the battery cell, the positive electrode active material and the negative electrode active material react with the electrolyte in the battery cell, and the tabs 42 are electrically connected to the electrode terminal 3 to form an electric current circuit.

[0060] By making the arrangement direction of the tabs 42 and the main body portion 41 perpendicular to the thickness direction of the end cap 2, the end face of the lead-out tab 42 does not correspond to the largest surface (i.e., the end cap 2) in the battery cell, the waste of space caused by the lead-out tab 42 is significantly reduced, and the energy density is increased.

[0061] Exemplarily, taking a rectangular battery as an example, it includes two large walls with the largest area, two medium-sized walls with the next largest area, and two small walls with the smallest area. The end face 43 from which the tab 42 extends may be one of the end faces 43 facing the medium-sized wall or the small wall.

[0062] Optionally, one or more electrode assemblies 4 may be provided.

[0063] As shown in FIGS. 6 to 8, in some alternative embodiments of the present application, the case 1 includes intersecting first wall 12 and second wall 13. The area of the second wall 13 is larger than the area of the first wall 12 and smaller than the area of the end cap 2. The electrode terminal 3 is provided on the first wall 12, and the end face 43 from which the tab 42 of the main body 41 extends faces the second wall 13.

[0064] By providing the electrode terminal 3 on the first wall 12 and making the area of the second wall 13 larger than the area of the first wall 12, the areas of the end face of the lead tab 42 and the end face facing it can be increased, making it easier for the liquid (such as the electrolyte) to enter the electrode assembly 4, maximizing the wetting area of the electrode assembly 4, and enhancing the wetting effect.

[0065] Exemplarily, taking a rectangular battery as an example, it includes two large walls with the largest area, two medium-sized walls with the next largest area, and two small walls with the smallest area. One of the first wall 12 and the second wall 13 may be one of the medium-sized walls or the small walls, and the other of the first wall 12 and the second wall 13 is the other of the medium-sized walls or the small walls.

[0066] As shown in FIGS. 6 to 8, in some alternative embodiments of the present application, the battery cell further includes a connecting member 5 for connecting the electrode terminal 3 and the tab 42. By providing the connecting member 5, the tab 42 can be easily connected to the electrode terminal 3.

[0067] Optionally, the connecting member 5 can adopt a connecting piece made of a conductive material.

[0068] In some alternative embodiments of the present application, the connection member 5 includes a first connection portion 51 and a second connection portion 52. The first connection portion 51 is used for connecting to the electrode terminal 3, and the second connection portion 52 is used for connecting to the tab 42. By providing the first connection portion 51 and the second connection portion 52, the connection sites to the electrode terminal 3 and the tab 42 in the connection member 5 can be made relatively independent, and it becomes easier to provide a structure for connecting to the electrode terminal 3 and the tab 42 in the connection member 5.

[0069] Optionally, the first connection portion 51 and the second connection portion 52 may be integrally formed or provided separately. Exemplarily, the first connection portion 51 and the second connection portion 52 can be connected by one of a welding structure, a conductive adhesive structure, or a riveting structure. The conductive connection by the welding structure refers to connecting the first connection portion 51 and the second connection portion 52 by welding means such as laser welding. The conductive connection by the conductive adhesive structure refers to adhering the first connection portion 51 and the second connection portion 52 using a conductive adhesive. The conductive adhesive may be a conductive adhesive film. The conductive adhesive can not only achieve electrical connection between the first connection portion 51 and the second connection portion 52 but also achieve mechanical connection between them. The conductive connection by the riveting structure refers to connecting the first connection portion 51 and the second connection portion 52 to each other by rivets.

[0070] Optionally, the tab 42 may be provided between the second connection portion 52 and the second wall 13. After bending the tab 42, it can wrap around the surface of the second connection portion 52, increasing the contact area between the second connection portion 52 and the tab 42.

[0071] As shown in FIGS. 6 to 8, in some alternative embodiments of the present application, the connection member 5 is L-shaped.

[0072] By providing the connection member 5 in an L-shape, it becomes easier to provide the connection member 5 at the corner where the first wall 12 and the second wall 13 intersect, making full use of the remaining space in the case 1 and increasing the energy density of the battery cell.

[0073] As shown in FIG. 4, in some alternative embodiments of the present application, along the thickness direction of the end cap 2 (the x-axis direction in the figure), the case 1 has two openings 11 provided opposite to each other, the battery cell includes two end caps 2, and the two end caps 2 are provided corresponding to the two openings 11. By providing the two openings 11, the operation space during assembly in the case 1 can be further enlarged, and the assembly efficiency can be improved.

[0074] FIG. 9 is a schematic structural diagram of the electrode assembly 4 provided by some embodiments of the present application. As shown in FIGS. 3, 6 to 9, in some alternative embodiments of the present application, along the thickness direction of the second wall 13 (the x-axis direction in the figure), the dimension of the main body 41 of the electrode assembly 4 is H1, the dimension of the case 1 is H2, and H1 / H2≧0.8 is satisfied. By limiting the ratio of H1 / H2, the main body occupies the internal space of the battery cell as much as possible, reduces the space occupied by other members (such as connection members) of the battery cell, and can improve the space utilization rate and energy density of the battery cell.

[0075] Optionally, the dimension of the main body 41 of the electrode assembly 4 is H1, the dimension of the case 1 is H2, and H1 / H2≧0.9 is satisfied.

[0076] Optionally, the dimension of the main body 41 of the electrode assembly 4 is H1, the dimension of the case 1 is H2, and H1 / H2 is equal to 0.85, 0.9 or 0.95.

[0077] As shown in FIGS. 3, 6 to 9, in some alternative embodiments of the present application, the electrode assembly is a wound electrode assembly. Along the first direction (the z-axis direction in the figure), the dimension of the electrode assembly 4 is L, satisfying 300 mm ≤ L ≤ 800 mm. The first direction is perpendicular to the thickness direction of the end cap 2 (the x-axis direction in the figure) and the thickness direction of the second wall 13 (the y-axis direction in the figure). The production efficiency of the wound electrode assembly 4 is high. By limiting the dimension of the electrode assembly in the first direction, it is possible to reduce the problem that if L is too small, the energy density of the battery cell will be low, and it is also possible to reduce the problem that if L is too large, the processing difficulty of the electrode assembly will increase and the production efficiency of the electrode assembly will decrease.

[0078] Optionally, along the first direction, the dimension of the electrode assembly 4 is L, satisfying 500 mm ≤ L ≤ 550 mm.

[0079] Optionally, along the first direction, the dimension of the electrode assembly 4 is L, satisfying that L is equal to 400 mm, 500 mm, 600 mm or 700 mm.

[0080] As shown in FIGS. 3, 6 to 9, in some alternative embodiments of the present application, along the thickness direction of the end cap 2 (the x-axis direction in the figure), the dimension of the electrode assembly 4 is D, satisfying 10 mm ≤ D ≤ 80 mm. When there is one electrode assembly 4, the dimension of one electrode assembly 4 is D, and 10 mm ≤ D ≤ 80 mm. When there are multiple electrode assemblies 4, the multiple electrode assemblies 4 are arranged along the thickness direction of the end cap 2 (the x-axis direction in the figure), and D is the total dimension of the multiple electrode assemblies 4 in the thickness direction of the end cap 2 (the x-axis direction in the figure). By limiting the dimension of the electrode assembly in the thickness direction, it is possible to reduce the problem that if D is too small, the energy density of the battery cell will be low, and it is also possible to reduce the problem that if D is too large, the processing difficulty of the electrode assembly will increase and the production efficiency of the electrode assembly will decrease. Optionally, along the thickness direction of the end cap 2, the dimension of the electrode assembly 4 is D, satisfying 40 mm ≤ D ≤ 50 mm.

[0081] Optionally, along the thickness direction of the end cap 2, the dimension of the electrode assembly 4 is D, satisfying that D is equal to 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, and 70 mm.

[0082] According to a second aspect of the embodiment of the present application, a battery including the above battery cell is provided.

[0083] According to a third aspect of the embodiment of the present application, a power consumption device including the above battery cell and for providing electrical energy is provided.

[0084] In some alternative embodiments of the present application, a battery cell including a case 1, an end cap 2, and an electrode terminal 3 is provided. The case 1 has an opening 11, the end cap 2 is used to cover the opening 11, the electrode terminal 3 is provided on the case 1, and the end cap 2 is the wall with the largest area of the battery cell. The battery cell further includes an electrode assembly 4, the electrode assembly 4 is provided in the case 1, the electrode assembly 4 includes a main body portion 41 and a tab 42 extending from the main body portion 41, and the arrangement direction of the tab 42 and the main body portion 41 is perpendicular to the thickness direction of the end cap 2. The case 1 includes intersecting first wall 12 and second wall 13, the electrode terminal 3 is provided on the first wall 12, and the end face 43 from which the tab 42 of the main body portion 41 extends faces the second wall 13. The battery cell further includes a connecting member 5 for connecting the electrode terminal 3 and the tab 42, and the connecting member 5 is L-shaped. Along the thickness direction of the end cap 2, the case 1 has two oppositely provided openings 11, the battery cell includes two end caps 2, and the two end caps 2 are provided corresponding to the two openings 11. Along the thickness direction of the second wall 13, the dimension of the main body portion 41 of the electrode assembly 4 is H1, the dimension of the case 1 is H2, and H1 / H2≧0.9 is satisfied. Along the first direction, the dimension of the electrode assembly 4 is L, satisfying 490 mm≦L≦510 mm, and the first direction is perpendicular to the thickness direction of the end cap 2 and the thickness direction of the second wall 13. Along the thickness direction of the end cap 2, the dimension of the electrode assembly 4 is D, satisfying 45 mm≦D≦55 mm.

[0085] Compared with related technologies, in the battery cell, battery, and power consumption device of the embodiments of the present application, by providing the end cap 2 as the wall with the largest area in the battery cell, the area of the opening 11 can be increased, the structure inside the battery cell can more easily enter the case 1, the assembly speed during assembly is accelerated, and furthermore, the production efficiency of the battery cell is improved.

[0086] Finally, it should be noted that the above embodiments are merely for explaining the technical solution of the present application and are not for limiting it. Although the present application has been described in detail with reference to the above embodiments, as can be understood by those skilled in the art, still, the technical solutions described in the above embodiments can be modified, or equivalent substitutions can be made for some or all of their technical features. By these modifications and substitutions, the essence of the corresponding technical solutions does not deviate from the scope of the technical solutions of the embodiments of the present application, and all these modifications and substitutions should be included within the scope of the claims and the specification of the present application. In particular, as long as the structures do not conflict, all the technical features mentioned in each embodiment can be combined in any form. The present application is not limited to the specific embodiments disclosed in the specification and shall include all the technical solutions within the scope of the claims.

Explanation of Reference Numerals

[0087] 1000 Vehicle 100 Battery 200 Controller 300 Motor 110 Box 111 First Box Portion 112 Second Box Portion 10 Battery Cell 1 Case 11 Opening 12 First Wall 13 Second Wall 2 End Cap 3 Electrode Terminal 4 Electrode Assembly 41 Main Body Portion 42 Tab 43 End face 5 Connecting member 51 First connection part 52 Second connection part

Claims

1. A case having an opening, An end cap for covering the opening, An electrode terminal provided on the case, a battery cell comprising: The end cap is a battery cell that is the wall with the largest area of the battery cell.

2. The battery cell further includes an electrode assembly, the electrode assembly is provided in the case, The electrode assembly includes a main body portion and a tab extending from the main body portion, and the arrangement direction of the tab and the main body portion is perpendicular to the thickness direction of the end cap. The battery cell according to claim 1.

3. The case includes intersecting first and second walls, the area of the second wall is larger than the area of the first wall and smaller than the area of the end cap, the electrode terminal is provided on the first wall, and the end face from which the tab of the main body portion extends faces the second wall. The battery cell according to claim 2.

4. The battery cell further includes a connecting member for connecting the electrode terminal and the tab. The battery cell according to claim 3.

5. The connecting member includes a first connecting portion for connecting to the electrode terminal and a second connecting portion for connecting to the tab. The battery cell according to claim 4.

6. The connecting member is L-shaped. The battery cell according to claim 5.

7. Along the thickness direction of the end cap, the case has two openings provided opposite to each other, the battery cell includes two end caps, and the two end caps are provided corresponding to the two openings. The battery cell according to any one of claims 3 to 6.

8. Along the thickness direction of the second wall, the dimension of the main body portion of the electrode assembly is H1, the dimension of the case is H2, and H1 / H2 ≥ 0.8 is satisfied. The battery cell according to any one of claims 3 to 7.

9. The electrode assembly is a wound electrode assembly. Along a first direction, the dimension of the electrode assembly is L, and 300 mm ≤ L ≤ 800 mm is satisfied. The first direction is perpendicular to the thickness direction of the end cap and the thickness direction of the second wall. The battery cell according to any one of claims 3 to 7.

10. Along the thickness direction of the end cap, the dimension of the electrode assembly is D, and 10 mm ≤ D ≤ 80 mm is satisfied. The battery cell according to any one of claims 2 to 7.

11. A battery including the battery cell according to any one of claims 1 to 10.

12. A power consumption device that includes the battery cell according to any one of claims 1 to 10 and provides electrical energy.

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