Battery monomer, battery, energy storage device and power utilization device

Abstract

The utility model discloses a battery monomer, a battery, an energy storage device and a power utilization device, each electrode lead-out piece of the battery monomer comprises a first part, a middle part and a second part, the second part of the first electrode lead-out piece is connected with a first tab, the second part of the second electrode lead-out piece is connected with a second tab, and in a first direction, the middle part of the first electrode lead-out piece is connected with the middle part of the second electrode lead-out piece; the ratio of the distance between the center axis of the first portion of the first electrode lead-out piece and the center axis of the first portion of the second electrode lead-out piece to the size of the first shell wall is not larger than 60%, and the second portion of each electrode lead-out piece comprises a body portion coinciding with the first portion in the wall thickness direction of the first shell wall and an extending portion exceeding the first portion in the first direction. The extension part of the first electrode leading-out piece is located on the side, facing the second electrode leading-out piece, of the body part of the first electrode leading-out piece, and the extension part of the second electrode leading-out piece is located on the side, back to the first electrode leading-out piece, of the body part of the second electrode leading-out piece. The utility model has high volume energy density and high structural strength.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to battery cells, batteries, energy storage devices, and power-consuming devices. Background Art

[0002] New energy batteries are increasingly widely used in life and industries. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the energy storage field, etc. In new energy vehicles equipped with batteries, the batteries can be used to provide power wholly or partially. In the energy storage field, the batteries can be installed in an energy storage box or directly installed on the user side.

[0003] The structural strength of a battery is related to the service life of the battery. Therefore, how to improve the structural strength of the battery is one of the topics that the industry needs to study to extend the battery life. In addition, the industry continuously puts forward higher requirements for the volumetric energy density of the battery. Summary of the Utility Model

[0004] To solve the above technical problems, the present application provides a battery cell, a battery, an energy storage device, and a power-consuming device with high volumetric energy density and high structural strength.

[0005] The present application is implemented through the following technical solutions.

[0006] In a first aspect of the present application, a battery cell is provided, including: a housing having a first housing wall and a receiving cavity; an electrode assembly disposed in the receiving cavity, the electrode assembly having at least two tabs, and at least two of the tabs including a first tab and a second tab; at least two electrode lead-out members including a first electrode lead-out member and a second electrode lead-out member both disposed on the first housing wall and arranged along a first direction. Wherein, each of the electrode lead-out members includes a first portion located outside the housing, a second portion located inside the housing, and an intermediate portion connecting the first portion and the second portion. The second portion of the first electrode lead-out member is connected to the first tab, and the second portion of the second electrode lead-out member is connected to the second tab. In the first direction, the ratio of the distance between the central axes of the first portions of the first electrode lead-out member and the second electrode lead-out member to the size of the first housing wall is not greater than 60%. Each of the second portions of the electrode lead-out members includes a body portion that coincides with the first portion in the wall thickness direction of the first housing wall and an extension portion that extends beyond the first portion along the first direction. The extension portion of the first electrode lead-out member is located on the side of the body portion of the first electrode lead-out member facing the second electrode lead-out member, and the extension portion of the second electrode lead-out member is located on the side of the body portion of the second electrode lead-out member facing away from the first electrode lead-out member.

[0007] In the technical solution of the embodiment of the present application, since the extending portions of the second parts of the first electrode lead-out member and the second electrode lead-out member extend from the body parts they are respectively connected to the same side, that is, the second parts of the first electrode lead-out member and the second electrode lead-out member are arranged in the same direction, which is conducive to reducing the distance between the first parts of the first electrode lead-out member and the second electrode lead-out member. Moreover, the present application also defines the range of the ratio of the distance between the central axes of the first parts of the first electrode lead-out member and the second electrode lead-out member to the size of the first housing wall, so that the first electrode lead-out member and the second electrode lead-out member are arranged relatively concentratedly, which is conducive to improving the structural strength of the first housing wall. Moreover, the continuous space remaining on the inner and outer sides of the first housing wall is relatively large, which is conducive to the arrangement of other components, and thus conducive to improving the volumetric energy density of the battery cell.

[0008] In some embodiments, each of the electrode lead-out members includes an electrode terminal passing through the terminal mounting hole of the first housing wall and a connecting piece connected to one end of the electrode terminal located in the accommodation cavity. The part of the electrode terminal located outside the outer shell is the first part, the part located in the terminal mounting hole is the middle part, and the part of the electrode terminal located inside the outer shell and the connecting piece form the second part.

[0009] In this way, the electrode terminal and the connecting piece are connected to form an electrode lead-out member for introducing or leading out current. Moreover, the first electrode lead-out member and the second electrode lead-out member are arranged relatively concentratedly, which is conducive to improving the structural strength of the first housing wall. Moreover, the continuous space remaining on the inner and outer sides of the first housing wall is relatively large, which is conducive to the arrangement of other components, and thus conducive to improving the volumetric energy density of the battery cell.

[0010] In some embodiments, the second part is an integrally formed structure.

[0011] The second part being an integrally formed structure makes the structural strength of the electrode lead-out member high and also reduces the time occupied during the assembly of the split structure.

[0012] In some embodiments, among the first tab and the second tab, one is a positive tab and the other is a negative tab.

[0013] In this way, one of the first electrode lead-out member and the second electrode lead-out member is a positive terminal and the other is a negative terminal. Moreover, the battery cell has high structural strength and high volumetric energy density.

[0014] In some embodiments, both the first tab and the second tab are positive tabs, or both the first tab and the second tab are negative tabs.

[0015] In this way, the first electrode lead-out member and the second electrode lead-out member are terminals of the same polarity, both being positive terminal or both being negative terminal. Moreover, the battery cell has high structural strength and high volumetric energy density.

[0016] In some embodiments, the first tab and the second tab are formed integrally.

[0017] In this way, the first tab and the second tab being formed integrally is conducive to the first electrode lead-out member and the second electrode lead-out member being closer, which is more conducive to improving the structural strength of the first housing wall. Moreover, it makes the continuous space available on the inner and outer sides of the first housing wall larger, thus facilitating the arrangement of other components, and further conducive to improving the volumetric energy density of the battery cell.

[0018] In some embodiments, the first tab and the second tab are arranged at intervals.

[0019] In this way, the first tab and the second tab do not affect each other, facilitating the connection of the first electrode lead-out member and the second electrode lead-out member to the first tab and the second tab respectively, and enabling the first electrode lead-out member and the second electrode lead-out member not to affect each other.

[0020] In some embodiments, the minimum distance between the second part of the first electrode lead-out member and the second part of the second electrode lead-out member in the first direction is not less than 5 mm.

[0021] One end of the second part of the first electrode lead-out member close to the second electrode lead-out member extends beyond the edge of the first tab along the first direction. In this way, the minimum distance between the second part of the first electrode lead-out member and the second part of the second electrode lead-out member in the first direction is the closest distance between the part of the first electrical connection structure formed by the first electrode lead-out member and the first tab located within the first housing wall and the part of the second electrical connection structure formed by the second electrode lead-out member and the second tab located within the first housing wall. Therefore, by defining the above distance, the reliability of electrical insulation within the first housing wall is improved, thereby reducing the probability of mutual influence between the first electrical connection structure and the second electrical connection structure, and further improving the performance of the battery cell.

[0022] In some embodiments, along the first direction, the distance between the central axes of the first part of the first electrode lead-out member and the first part of the second electrode lead-out member is not greater than 100 mm.

[0023] By defining the value range of the distance along the first direction between the central axes of the first parts of the first electrode lead-out member and the second electrode lead-out member, the first electrode lead-out member and the second electrode lead-out member are arranged relatively compactly, which is beneficial to improving the structural strength of the first housing wall. Moreover, the continuous space available on the inner and outer sides of the first housing wall is relatively large, which is conducive to the arrangement of other components, and thus conducive to improving the volume energy density of the battery cell.

[0024] In some embodiments, along the first direction, the minimum distance between the first part of the first electrode lead-out member and the first part of the second electrode lead-out member is not less than 2 mm.

[0025] In this way, by limiting the minimum distance along the first direction between the first part of the first electrode lead-out member and the first part of the second electrode lead-out member to be not less than 2 mm, the reliable degree of electrical insulation between the first part of the first electrode lead-out member and the first part of the second electrode lead-out member is improved, thereby reducing the probability of mutual influence between the first electrode lead-out member and the second electrode lead-out member, and further improving the performance of the battery cell.

[0026] In some embodiments, for each electrode lead-out member, the end face of the electrode terminal far from the accommodation cavity is the first end face, and the end face close to the accommodation cavity is the second end face, and the area of the second end face is smaller than the area of the first end face.

[0027] The first end face is the outer end face of the electrode terminal and is used for welding with the busbar structure. The second end face is the inner end face of the electrode terminal and is used for welding with the adapter plate. Since during the process of assembling battery cells into a battery pack, it is necessary to ensure current conduction by welding the first end face with the busbar structure, a relatively large welding mark area needs to be ensured, so the area of the first end face needs to be set relatively large, while a smaller area of the second end face can also ensure the welding mark area with the adapter plate.

[0028] In some embodiments, along the first direction, the ratio of the size of the second end face to the size of the first end face is in the range of 20% - 150%.

[0029] In this way, by limiting the ratio of the size of the second end face to the size of the first end face along the first direction to be in the range of 20% - 150%, it is beneficial to make the welding mark areas at the first end face and the second end face reach their respective standards, thereby improving the charge and discharge efficiency of the battery cell.

[0030] In some embodiments, along the first direction, the ratio of the size of the second end face to the size of the first end face is in the range of 25% - 100%.

[0031] Since the battery cells need to be welded to another battery cell through the first end face to ensure current conduction during the grouping process, a relatively large welding mark area needs to be ensured. Therefore, the area of the first end face needs to be set relatively large, and a smaller area of the second end face can also ensure the welding mark area with the connecting piece. Therefore, by limiting the ratio of the size of the second end face to the size of the first end face in the first direction to the range of 25% - 100%, it is beneficial for the area of the first end face to be larger than that of the second end face, so that the welding mark areas at both connection points of the electrode terminal meet their respective current conduction standards, thereby improving the charge and discharge efficiency of the battery cell.

[0032] In some embodiments, along the first direction, the size of the first end face is in the range of 20 mm to 50 mm, and / or the size of the second end face is in the range of 10 mm to 30 mm.

[0033] In this way, by respectively limiting the sizes of the first end face and the second end face, it is more beneficial for the welding mark areas at both connection points of the electrode terminal to meet their respective current conduction standards, thereby improving the charge and discharge efficiency of the battery cell.

[0034] In some embodiments, along the first direction, the size of the first end face is in the range of 25 mm to 40 mm, and / or the size of the second end face is in the range of 10 mm to 25 mm.

[0035] In this way, by further restricting the value ranges of the sizes of the first end face and the second end face, it is more beneficial for the welding mark areas at both connection points of the electrode terminal to meet their respective current conduction standards, thereby improving the charge and discharge efficiency of the battery cell.

[0036] In some embodiments, the size of the surface of the tab facing the first housing wall in the first direction is in the range of 25 mm to 65 mm.

[0037] In this way, by limiting the size of the surface of the tab facing the first housing wall in the first direction to the range of 25 mm to 65 mm, it is beneficial for the welding mark area between the tab and the electrode lead-out member to be within a suitable range and does not occupy too much space, thereby facilitating the increase of the continuous space and improving the volume energy density of the battery cell.

[0038] In some embodiments, the size of the surface of the tab facing the first housing wall in the first direction is in the range of 30 mm to 50 mm.

[0039] Thus, by limiting the dimension of the surface of the tab facing the first housing wall in the first direction within the range of 30 mm to 50 mm, it is more beneficial to keep the welding area of the tab and the electrode lead-out member within a suitable range, and it will not occupy too much space, thereby facilitating the increase of the continuous space and improving the volumetric energy density of the battery cell.

[0040] In some embodiments, along the first direction, the midpoint between the central axes of the first parts of the first electrode lead-out member and the second electrode lead-out member is offset from the center of the first housing wall.

[0041] Thus, the continuous space on the side of the first housing wall opposite to the deviation direction of the first electrode lead-out member and the second electrode lead-out member is larger, which is beneficial to the arrangement of other components and more beneficial to improving the volumetric energy density of the battery cell.

[0042] In some embodiments, along the first direction, the ratio of the distance between the midpoint between the central axes of the first parts of the first electrode lead-out member and the second electrode lead-out member and the center of the first housing wall to the size of the first housing wall is not greater than 47.5%.

[0043] Thus, by limiting the ratio of the distance between the midpoint between the central axes of the first parts of the first electrode lead-out member and the second electrode lead-out member and the center of the first housing wall to the size of the first housing wall within the range not greater than 47.5% along the first direction, it enables the end of the first housing wall near the deviation direction to be sufficient for installing the first electrode lead-out member and the second electrode lead-out member, and also enables the continuous space on the side of the first housing wall opposite to the deviation direction of the first electrode lead-out member and the second electrode lead-out member to be larger, which is beneficial to the arrangement of other components and more beneficial to improving the volumetric energy density of the battery cell.

[0044] In some embodiments, along the first direction, the ratio of the distance between the midpoint between the central axes of the first parts of the first electrode lead-out member and the second electrode lead-out member and the center of the first housing wall to the size of the first housing wall is in the range of 40% to 47.5%.

[0045] Thus, along the first direction, the ratio of the distance between the midpoint of the central axis of the first part of the first electrode lead-out member and the central axis of the first part of the second electrode lead-out member to the size of the first housing wall is limited within the range of 40% to 47.5%, so that one end of the first housing wall close to the deviation direction is sufficient to install the first electrode lead-out member and the second electrode lead-out member, and at the same time, the continuous space on the side of the first housing wall located on the side opposite to the deviation direction of the first electrode lead-out member and the second electrode lead-out member can be made larger, which is beneficial to the arrangement of other components and more beneficial to improving the volume energy density of the battery cell.

[0046] In some embodiments, in the same electrode lead-out member, the distance between the central axis of the first part and the edge of the end of the extension part far from the body part along the first direction is in the range of 30 mm to 80 mm.

[0047] Thus, by limiting the distance between the central axis of the first part and the edge of the end of the extension part far from the body part along the first direction in the same electrode lead-out member within the range of 30 mm to 80 mm, it is beneficial to make the second part of the electrode lead-out member have a large enough welding area, thereby increasing the welding mark area between the second part and the tab, improving the reliability of electrical connection, and improving the performance of the battery cell.

[0048] In some embodiments, in the same electrode lead-out member, the distance between the central axis of the first part and the edge of the end of the extension part far from the body part along the first direction is in the range of 40 mm to 60 mm.

[0049] Thus, by limiting the distance between the central axis of the first part and the edge of the end of the extension part far from the body part along the first direction in the same electrode lead-out member within the range of 40 mm to 60 mm, it is beneficial to make the second part of the electrode lead-out member have a large enough welding area, thereby increasing the welding mark area between the second part and the tab, improving the reliability of electrical connection. Moreover, it will not occupy too much space in the first direction, which is also beneficial to improving the volume energy density.

[0050] The second aspect of the present application provides a battery, including: at least one of the above-mentioned battery cells.

[0051] Since the battery includes the battery cell, the battery has all the beneficial effects of the battery cell. Therefore, the battery has high structural strength and high volume energy density.

[0052] The third aspect of the present application provides an energy storage device, including: at least one of the above-mentioned battery cells or the above-mentioned battery.

[0053] Since the energy storage device includes battery cells or batteries, the energy storage device has all the beneficial effects of the battery cells or batteries. Therefore, the energy storage device has high structural strength and is conducive to reducing the accommodation space of the energy storage device for accommodating battery cells or batteries, or the energy storage device can accommodate battery cells or batteries with a larger capacity in a limited accommodation space.

[0054] The fourth aspect of the present application provides an electrical device, and the electrical device includes the above-mentioned battery cell or the above-mentioned battery for providing electrical energy.

[0055] Since the electrical device includes battery cells or batteries, the electrical device has all the beneficial effects of the battery cells or batteries. Therefore, the electrical device has high structural strength and is conducive to reducing the accommodation space of the electrical device for accommodating battery cells or batteries, or the electrical device can accommodate battery cells or batteries with a larger capacity in a limited accommodation space.

[0056] Utility Model Effects

[0057] Through the present application, it is possible to provide a battery cell, a battery, an energy storage device, and an electrical device having a high volume energy density and high structural strength. Brief Description of the Drawings

[0058] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0059] Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application;

[0060] Figure 2 is a three-dimensional exploded view of a battery provided by some embodiments of the present application;

[0061] Figure 3 is a three-dimensional structural diagram of a battery cell provided by some embodiments of the present application;

[0062] Figure 4 is a top view of a battery cell provided by some embodiments of the present application;

[0063] Figure 5 is Figure 4 a cross-sectional view taken along line A-A in

[0064] Figure 6 is Figure 5 an enlarged view of A in

[0065] Figure 7Schematic exploded view of a battery cell provided for some embodiments of the present application;

[0066] Figure 8 Partial cross-sectional view of another structure of a battery cell provided for some embodiments of the present application;

[0067] Figure 9 Top view of yet another structure of a battery cell provided for some embodiments of the present application;

[0068] Figure 10 Partial cross-sectional view of a battery cell in the prior art.

[0069] Description of reference numerals

[0070] 1000 Vehicle; 100 Battery; 10 Battery box; 101 Box cover; 102 Box body; 200 Controller; 300 Motor; 20 Battery cell; 1 Outer shell; 11 First shell wall; 111 Terminal mounting hole; 2 Electrode assembly; 21 First tab; 22 Second tab; 3a First electrode lead-out member; 3b Second electrode lead-out member; 30 Electrode terminal; 31 First part; 3111 First end face; 32 Intermediate part; 33 Second part; 3311 Body part; 3312 Extension part; 3313 Second end face; 311 Terminal plate; 3110 Through hole; 312 Terminal disk; 313 Connecting column; 314 Adapter plate; 4 Insulation structure; 5 Insulating part. Detailed implementation manners

[0071] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and the above accompanying drawings of this application are intended to cover non-exclusive inclusion.

[0073] In the description of the embodiments of the present application, technical terms such as "first", "second", "third", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means more than two unless otherwise specifically defined.

[0074] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0075] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0076] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0077] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0078] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0079] Below, this application is described in detail.

[0080] At present, new energy batteries are increasingly widely used in life and industry. New energy batteries are not only applied to energy storage power systems such as hydraulic, thermal, wind, and solar power stations, but also widely used in electric transportation tools such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0081] In the embodiment of the present application, the battery includes battery cells.

[0082] The inventors of the present application have noticed that currently, the end cover of the battery cell is provided with two pole columns, and each of the two pole columns is respectively connected to two pole ears through a transfer piece. The two pole ears are both arranged on the side where the two pole columns face each other. The two transfer pieces extend from the end where they are connected to the pole columns along the direction towards each other, and the ends where the two transfer pieces approach each other are connected to the pole ears, that is, the two transfer pieces are arranged facing each other. Thus, the space occupied by the two transfer pieces in the interval direction of the two pole columns is relatively large, resulting in a relatively large distance between the two pole columns, a relatively low structural strength of the end cover, and a relatively small continuous free space of the end cover, which is not conducive to the arrangement of other components and is likely to affect the volume energy density of the battery cell.

[0083] The inventors of the present application have found through research that changing the arrangement of the two transfer pieces from facing each other to in the same direction is conducive to the close arrangement of the pole columns, and limiting the distance between the pole columns within a relatively small range, making the arrangement of the pole columns relatively concentrated, which is conducive to improving the structural strength of the end cover. Moreover, the continuous free space inside and outside the end cover is relatively large, which is thus conducive to the arrangement of other components, and further conducive to improving the volume energy density of the battery cell.

[0084] Based on such a design concept, the inventors of the present application have designed a battery cell. The battery cell includes a housing, an electrode assembly, and at least two electrode lead-out members. The housing has a first housing wall and a receiving cavity; the electrode assembly is disposed in the receiving cavity, the electrode assembly has at least two tabs, and the at least two tabs include a first tab and a second tab; the at least two electrode lead-out members include a first electrode lead-out member and a second electrode lead-out member that are both disposed on the first housing wall and arranged along a first direction. Each electrode lead-out member includes a first portion located outside the housing, a second portion located inside the housing, and an intermediate portion connecting the first portion and the second portion. The second portion of the first electrode lead-out member is connected to the first tab, and the second portion of the second electrode lead-out member is connected to the second tab. In the first direction, the ratio of the distance between the central axes of the first portions of the first electrode lead-out member and the second electrode lead-out member to the size of the first housing wall is not greater than 60%. The second portion of each electrode lead-out member includes a body portion that coincides with the first portion in the wall thickness direction of the first housing wall and an extension portion that extends beyond the first portion along the first direction. The extension portion of the first electrode lead-out member is located on the side of the body portion of the first electrode lead-out member facing the second electrode lead-out member, and the extension portion of the second electrode lead-out member is located on the side of the body portion of the second electrode lead-out member facing away from the first electrode lead-out member.

[0085] The extension portions of the second portions of the first electrode lead-out member and the second electrode lead-out member of the present application extend from the respective connected body portions to the same side, that is, the second portions of the first electrode lead-out member and the second electrode lead-out member are arranged in the same direction, which is beneficial to setting a relatively small distance between the first portions of the first electrode lead-out member and the second electrode lead-out member. Moreover, the present application also limits the ratio of the distance between the central axes of the first portions of the first electrode lead-out member and the second electrode lead-out member to the size of the first housing wall within a range not greater than 60%, so that the two electrode lead-out members are arranged more concentratedly, which is beneficial to improving the structural strength of the first housing wall. Furthermore, the continuous free space on the inner and outer sides of the first housing wall is relatively large, which is beneficial to the arrangement of other components, and thus beneficial to improving the volumetric energy density of the battery cell.

[0086] The battery cell provided by the embodiment of the present application can be but is not limited to being used in an electric device or an energy storage device. The electric device can be but is not limited to a vehicle, a ship, an aircraft, etc. For example, a mobile phone, a portable device, a laptop computer, an electric vehicle, an electric toy, an electric tool, a vehicle, a ship, and a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle, and a spaceship, etc. The energy storage device can be but is not limited to an energy storage container, an energy storage cabinet, etc.

[0087] The present application also provides a battery, which may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel or in a hybrid connection through a busbar component.

[0088] In the embodiments of the present application, "multiple" means two or more.

[0089] In some embodiments of the present application, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0090] In some embodiments of the present application, the battery may be a battery pack, which includes a battery box and battery cells, and the battery cells or battery modules are accommodated in the battery box.

[0091] In some embodiments of the present application, the battery box may be part of the chassis structure of a vehicle. For example, part of the battery box may become at least part of the floor of the vehicle, or part of the battery box may become at least part of the crossbeam and longitudinal beam of the vehicle.

[0092] The battery provided by the embodiments of the present application can be but is not limited to being used in an electrical device or an energy storage device. The electrical device can be but is not limited to a vehicle, a ship or an aircraft, etc. For example, a mobile phone, a portable device, a laptop computer, an electric vehicle, an electric toy, an electric tool, a vehicle, a ship and a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc. The energy storage device can be but is not limited to an energy storage container, an energy storage cabinet, etc.

[0093] The embodiments of the present application also provide an energy storage device. The energy storage device includes battery cells or a battery.

[0094] The energy storage device provided by the embodiments of the present application can be but is not limited to an energy storage container, an energy storage cabinet, etc.

[0095] The embodiments of the present application also provide an electrical device, which includes battery cells or a battery for providing electrical energy.

[0096] The electrical device provided by the embodiments of the present application can be but is not limited to a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy. For example, a game console, an electric vehicle toy, an electric ship toy and an electric airplane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle and a spaceship, etc.

[0097] In the following embodiments, for the convenience of description, the electrical device in an embodiment of the present application is taken as the vehicle 1000 as an example for description. The following is described with reference to the accompanying drawings.

[0098] Figure 1 A schematic structural diagram of vehicle 1000 provided for some embodiments of the present application.

[0099] Vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. As Figure 1 shown, a battery 100 is disposed inside vehicle 1000. The battery 100 can be disposed at the bottom, head, or tail of vehicle 1000. The battery 100 can be used to supply power to vehicle 1000. For example, the battery 100 can serve as the operating power source of vehicle 1000. Vehicle 1000 can also 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 for the working power requirements during the start, navigation, and driving of vehicle 1000.

[0100] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of vehicle 1000, but also serve as the driving power source of vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 1000.

[0101] Figure 2 A three-dimensional exploded schematic diagram of battery 100 provided for some embodiments of the present application.

[0102] As Figure 2 shown, the battery 100 includes a battery box 10 and at least one battery cell 20. The battery box 10 is provided with a receiving space, and at least one battery cell 20 is received in the receiving space.

[0103] In some embodiments of the present application, the battery box 10 includes a box body 102 and a box cover 101. The box cover 101 covers above the box body 102, thereby forming the receiving space between the box body 102 and the box cover 101.

[0104] The box body 102 can be a hollow structure with one end open, and the box cover 101 can be a plate-like structure. The box cover 101 is closed on the open side of the box body 102 so that the box cover 101 and the box body 102 jointly define the receiving space; the box cover 101 and the box body 102 can also both be hollow structures with one side open, and the open side of the box cover 101 is closed on the open side of the box body 102. Of course, the battery box 10 formed by the box cover 101 and the box body 102 can be in various shapes, such as a cylinder, a cuboid, etc.

[0105] In battery 100, there can be multiple battery cells 20. The multiple battery cells 20 can be connected in series, in parallel, or in a combined series-parallel connection. A combined series-parallel connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a combined series-parallel connection together, and then the whole formed by the multiple battery cells 20 is placed in the accommodation space formed by the box body 102 and the box cover 101. Of course, the battery 100 can also be in the form that multiple battery cells 20 are first connected in series, in parallel, or in a combined series-parallel connection to form battery modules, and then the multiple battery modules are connected in series, in parallel, or in a combined series-parallel connection to form a whole and are accommodated in the accommodation space formed by the box body 102 and the box cover 101. The battery 100 can also include other structures. For example, the battery 100 can also include a busbar component for realizing the electrical connection among the multiple battery cells 20.

[0106] In the embodiments of the present application, the battery cell 20 can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0107] The battery cell 20 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application do not limit this.

[0108] The battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a multi-prismatic battery. The multi-prismatic battery is, for example, a hexagonal prism battery, etc. The present application has no special limitation.

[0109] Next, with reference to Figures 3 to 10 Some embodiments of the present application will be described in detail.

[0110] Figure 3 Schematic perspective view of a battery cell provided for some embodiments of the present application; Figure 4 Top view of a battery cell provided for some embodiments of the present application; Figure 5 For Figure 4 Cross-sectional view taken along line A-A in

[0111] Figure 6 For Figure 5 Enlarged view at point A in Figure 7 Schematic exploded perspective view of a battery cell provided for some embodiments of the present application; Figure 8 Partial cross-sectional view of another structure of a battery cell provided for some embodiments of the present application; Figure 9 Top view of yet another structure of a battery cell provided for some embodiments of the present application; Figure 10 Partial cross-sectional view of a battery cell in the prior art.

[0112] In the description of the embodiments of the present application, for the convenience of description, the direction of the arrow X is used to represent the length direction of the first housing wall; the direction of the arrow Y is used to represent the width direction of the first housing wall; the direction of the arrow Z is used to represent the wall thickness direction of the first housing wall.

[0113] The first aspect of the present application provides a battery cell 20, as Figures 3 to 6 shown, the battery cell 20 includes a housing 1, an electrode assembly 2 and at least two electrode lead-out members. The housing 1 has a first housing wall 11 and a receiving cavity; the electrode assembly 2 is disposed in the receiving cavity. The electrode assembly 2 has at least two tabs, and the at least two tabs include a first tab 21 and a second tab 22; the at least two electrode lead-out members include a first electrode lead-out member 3a and a second electrode lead-out member 3b that are both disposed on the first housing wall 11 and arranged along a first direction. Each electrode lead-out member includes a first portion 31 located outside the housing 1, a second portion 33 located inside the housing 1, and an intermediate portion 32 connected between the first portion 31 and the second portion 33. The second portion 33 of the first electrode lead-out member 3a is connected to the first tab 21, and the second portion 33 of the second electrode lead-out member 3b is connected to the second tab 22. In the first direction, the ratio of the distance L1 between the central axes of the first portions 31 of the first electrode lead-out member 3a and the second electrode lead-out member 3b to the dimension L2 of the first housing wall 11 is not greater than 60%. The second portion 33 of each electrode lead-out member includes a body portion 3311 that coincides with the first portion 31 in the wall thickness direction Z of the first housing wall 11 and an extension portion 3312 that extends beyond the first portion 31 along the first direction. The extension portion 3312 of the first electrode lead-out member 3a is located on the side of the body portion 3311 of the first electrode lead-out member 3a facing the second electrode lead-out member 3b, and the extension portion 3312 of the second electrode lead-out member 3b is located on the side of the body portion 3311 of the second electrode lead-out member 3b facing away from the first electrode lead-out member 3a.

[0114] The electrode assembly 2 is a component in the battery cell 20 where an electrochemical reaction occurs. One or more electrode assemblies 2 may be included in the housing 1. The electrode assembly 2 includes a positive electrode plate, a negative electrode plate, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode plate and the negative electrode plate, which can prevent short circuit between the positive and negative electrodes and at the same time allow active ions to pass through. The portions of the positive electrode plate and the negative electrode plate having active materials constitute the main body portion of the electrode assembly 2, and the portions of the positive electrode plate and the negative electrode plate without active materials respectively constitute the positive electrode tab and the negative electrode tab. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion respectively. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte.

[0115] As Figure 3As shown, the outer casing 1 has a plurality of casing walls. For convenience of description, one of the casing walls is named the first casing wall 11. The electrode assembly 2 is located in the accommodation cavity surrounded by the plurality of casing walls.

[0116] In some embodiments, the outer casing 1 is used to encapsulate components such as the electrode assembly 2 and the electrolyte. The outer casing 1 can be a steel casing, an aluminum casing, a plastic casing (such as polypropylene), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum plastic film, etc.

[0117] In some embodiments, the outer casing 1 can be a sealed structure or a non-sealed structure. As an example, when the outer casing 1 is a non-sealed structure, the outer casing 1 plays a role in protecting the electrode assembly, and a sealing bag is further included between the outer casing and the electrode assembly. The sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating part or an aluminum plastic film. As an example, the battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc. In Figures 3 to 9 In the illustrated embodiment, for ease of explanation, a square-shell battery cell is taken as an example for illustration.

[0118] In some embodiments, such as Figures 3 to 5 As shown, the outer casing 1 includes a plurality of casing walls, and a part of the casing walls enclose a space with an opening, and the opening can be closed by other casing walls (such as the first casing wall 11) to form an accommodation cavity for accommodating substances such as the electrode assembly 2 and the electrolyte. The outer casing 1 can be provided with one or more openings. The casing wall (such as the first casing wall 11) closing the opening can also be configured as a top cover.

[0119] Such as Figures 5 to 9 As shown, for ease of explanation, in the embodiments of the present application, the casing wall where the first electrode lead-out member 3a and the second electrode lead-out member 3b are located is called the first casing wall 11. The first electrode lead-out member 3a and the second electrode lead-out member 3b are provided on the first casing wall 11, and the first electrode lead-out member 3a and the second electrode lead-out member 3b are connected to the tabs of the electrode assembly 2 to conduct the current in the electrode assembly 2 into or out of it.

[0120] Optionally, the number of electrode lead-out members can be two, three, four, etc. The electrode lead-out member can be located at the central position of the first casing wall 11 or at a position on the first casing wall 11 that is offset from the central position towards one end of the first casing wall 11.

[0121] The dimension of the first housing wall 11 in the length direction X is greater than the dimension in the width direction Y. The first direction in which the first electrode lead 3a and the second electrode lead 3b are spaced apart may be consistent with the length direction X of the first housing wall 11, may be consistent with the width direction of the first housing wall 11, or may intersect both the length direction X and the width direction Y of the first housing wall 11. Additionally, the arrangement of the first electrode lead 3a and the second electrode lead 3b may be an arrangement aligned with each other along the first direction, that is, the projections along the first direction completely overlap; or may be arranged along the first direction and offset from each other along a direction perpendicular to the first direction, that is, the projections along the first direction partially overlap or do not overlap. In this application, as a specific example, the arrangement mode of being aligned with each other along the first direction is taken as an example for description, and for the convenience of description, this application takes the first direction being consistent with the length direction X of the first housing wall 11 as an example for description.

[0122] The first part 31 of the electrode lead is the part that extends beyond the outer surface of the first housing wall 11 towards the outside of the housing 1. As Figure 4 shown, the ratio of the distance L1 along the first direction between the central axes of the first parts 31 of the first electrode lead 3a and the second electrode lead 3b to the dimension L2 of the first housing wall 11 is not greater than 60%, so that the first electrode lead 3a and the second electrode lead 3b are arranged relatively compactly.

[0123] Exemplarily, the ratio of the distance L1 along the first direction between the central axes of the first parts 31 of the first electrode lead 3a and the second electrode lead 3b to the dimension L2 of the first housing wall 11 may be, but is not limited to, 0.5%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55% or 60%.

[0124] As Figure 6 shown, the extension parts 3312 of the second parts 33 of the first electrode lead 3a and the second electrode lead 3b of this application extend towards the same side from the body parts 3311 to which they are connected. That is, the second parts 33 of the first electrode lead 3a and the second electrode lead 3b are arranged in the same direction, which is beneficial to reducing the distance between the first parts 31 of the first electrode lead 3a and the second electrode lead 3b. Moreover, as Figure 4As shown, the present application also defines the range of the ratio of the distance L1 between the central axes of the first parts 31 of the first electrode lead 3a and the second electrode lead 3b to the dimension L2 of the first housing wall 11, such that the first electrode lead 3a and the second electrode lead 3b are arranged relatively concentratedly, which is beneficial to improving the structural strength of the first housing wall 11. Moreover, the continuous space available on the inner and outer sides of the first housing wall 11 is relatively large, which is conducive to the arrangement of other components, and thus conducive to improving the volumetric energy density of the battery cell 20.

[0125] In some embodiments, as Figure 6 and Figure 7 shown, each electrode lead includes an electrode terminal 30 passing through the terminal mounting hole 111 of the first housing wall 11 and a connection piece 314 connected to one end of the electrode terminal 30 located in the accommodation cavity. The part of the electrode terminal 30 located outside the outer shell 1 is the first part 31, the part located in the terminal mounting hole 111 is the middle part 32, and the part of the electrode terminal 30 located inside the outer shell 1 and the connection piece 314 form the second part 33.

[0126] Exemplarily, one end of the electrode terminal 30 located in the accommodation cavity is welded to the connection piece 314. The connection piece 314 is welded to the tab.

[0127] It can be understood that the first electrode lead 3a includes an electrode terminal 30 and a connection piece 314. The electrode terminal 30 passes through the terminal mounting hole 111 of the first housing wall 11, and the connection piece 314 is connected to one end of the electrode terminal 30 located in the accommodation cavity. Similarly, the second electrode lead 3b includes an electrode terminal 30 and a connection piece 314. The electrode terminal 30 passes through the terminal mounting hole 111 of the first housing wall 11, and the connection piece 314 is connected to one end of the electrode terminal 30 located in the accommodation cavity. The connection pieces 314 of the first electrode lead 3a and the second electrode lead 3b are arranged in the same direction.

[0128] In this way, the electrode terminal 30 and the connection piece 314 are connected to form an electrode lead for introducing or leading out current. Moreover, the first electrode lead 3a and the second electrode lead 3b are arranged relatively concentratedly, which is beneficial to improving the structural strength of the first housing wall 11. Moreover, the continuous space available on the inner and outer sides of the first housing wall 11 is relatively large, which is conducive to the arrangement of other components, and thus conducive to improving the volumetric energy density of the battery cell 20.

[0129] In some embodiments, as Figure 7As shown, each electrode terminal 30 includes a terminal plate 312, a terminal board 311, and a connecting post 313. The terminal plate 312 is located inside the first housing wall 11 and is connected to the adapter piece 314. The terminal board 311 is located outside the first housing wall 11. One end of the connecting post 313 is connected to and integrally formed with the terminal plate 312. The connecting post 313 passes through the terminal mounting hole 111. The terminal board 311 is formed with a through hole 3110. The end of the connecting post 313 away from the terminal plate 312 is riveted to the terminal board 311 through the through hole 3110. The terminal plate 312 is the part of the electrode terminal 30 that extends beyond the inner surface of the first housing wall 11, and the adapter piece 314 is located inside the first housing wall 11. Therefore, Figure 7 the terminal plate 312 and the adapter piece 314 in Figure 6 are connected to form the second part 33 in Figure 7 The part of the adapter piece 314 that coincides with the terminal board 311 in the wall thickness direction Z of the first housing wall 11 and the terminal plate 312 form Figure 6 the main body part 3311 in Figure 7 The part of the adapter piece 314 that extends beyond the edge of the terminal board 311 along the first direction is Figure 6 the extension part 3312 in Figure 7 The part of the connecting post 313 located inside the terminal mounting hole 111 is Figure 6 the middle part 32 in Figure 7 The part of the connecting post 313 that penetrates into the through hole 3110 of the terminal board 311 and the terminal board 311 are both located outside the first housing wall 11. That is to say, Figure 7 the structure formed by the part of the connecting post 313 that penetrates into the through hole 3110 of the terminal board 311 and the terminal board 311 is Figure 6 the first part 31 in

[0130] The terminal board 311 is used for electrical connection with the busbar structure, and the busbar structure can realize the electrical connection between the battery cells 20. The terminal board 311 can be made of a metal material, such as copper, aluminum, etc. Optionally, the terminal board 311 is configured to be generally flat. The shape of the flat plate can be designed according to the situation. For example, it can be circular, Figure 7 the square shown in

[0131] The electrode terminal 30 can improve the heat dissipation performance, enhance the supporting effect on the first housing wall 11, and the connection strength with the busbar structure by designing the terminal board 311 to be larger.

[0132] The terminal plate 312 can be made of a metal material, such as copper, aluminum, etc. Optionally, the terminal plate 312 is configured to be generally flat. The shape of the flat plate can be designed according to the situation. For example, it can be circular, Figure 7 the square etc. shown in

[0133] Since the electrode terminal 30 includes a terminal plate 312 located within the first housing wall 11, the electrode terminal 30 can be easily connected to the tab of the electrode assembly 2 through the terminal plate 312. The shapes of the terminal plate 311 and the terminal plate 312 have a high degree of design freedom. Moreover, the terminal plate 311 and the terminal plate 312 sandwich the first housing wall 11 from the inside and outside of the housing 1 respectively, which can improve the bending strength of the first housing wall 11.

[0134] As Figure 7 shown, the terminal plate 311 and the terminal plate 312 are connected by a connecting post 313. There are no restrictions on the shape, size or quantity of the connecting post 313, as long as the connection between the terminal plate 311 and the terminal plate 312 can be achieved. In a specific embodiment, the connecting post 313 is cylindrical.

[0135] In some embodiments, as Figure 7 shown, an insulating structure 4 is provided between the terminal plate 311 and the first housing wall 11.

[0136] The insulating structure 4 and the terminal plate 311 are fixed to each other, and the fixing method can be integrally injection molded, bonded, fastened together by the connecting post 313, etc.

[0137] In some embodiments, an insulating member 5 can also be provided on the inner side of the first housing wall 11. The insulating member 5 can be used to isolate the electrical connection components within the housing 1 from the first housing wall 11 to reduce the risk of short circuit. Exemplarily, the insulating member 5 can be plastic, rubber, etc.

[0138] In some embodiments of the present application, the second part 33 is an integrally formed structure.

[0139] As Figure 8 shown, the second part 33 is an integrally formed structure, which makes the structural strength of the electrode lead-out member high and also reduces the time occupied during the assembly of the split structure.

[0140] In some embodiments of the present application, among the first tab 21 and the second tab 22, one is a positive tab and the other is a negative tab.

[0141] Thus, one of the first electrode lead-out member 3a and the second electrode lead-out member 3b is a positive terminal and the other is a negative terminal. Moreover, the battery cell 20 has high structural strength and high volume energy density.

[0142] In some embodiments of the present application, both the first tab 21 and the second tab 22 are positive tabs, or both the first tab 21 and the second tab 22 are negative tabs.

[0143] In this way, the first electrode lead 3a and the second electrode lead 3b are terminals of the same polarity, both being positive terminals or both being negative terminals. Moreover, the battery cell 20 has high structural strength and high volumetric energy density.

[0144] In some embodiments of the present application, the first tab 21 and the second tab 22 are formed integrally.

[0145] In this way, the first tab 21 and the second tab 22 being formed integrally is conducive to the first electrode lead 3a and the second electrode lead 3b being closer, which is more conducive to improving the structural strength of the first housing wall 11. Moreover, it makes the continuous space available inside and outside the first housing wall 11 larger, thus facilitating the arrangement of other components, and further conducive to improving the volumetric energy density of the battery cell 20.

[0146] In some embodiments of the present application, the first tab 21 and the second tab 22 are arranged at intervals.

[0147] Exemplarily, among the first tab 21 and the second tab 22, one is a positive tab and the other is a negative tab, and the first tab 21 and the second tab 22 are arranged at intervals.

[0148] Exemplarily, both the first tab 21 and the second tab 22 are positive tabs, or both the first tab 21 and the second tab 22 are negative tabs, and the first tab 21 and the second tab 22 are arranged at intervals.

[0149] In this way, the first tab 21 and the second tab 22 do not affect each other, facilitating the connection of the first electrode lead 3a and the second electrode lead 3b to the first tab 21 and the second tab 22 respectively, and making the first electrode lead 3a and the second electrode lead 3b not affect each other.

[0150] In some embodiments of the present application, as Figure 6 shown, the second part 33 of the first electrode lead 3a extends beyond the edge of the first tab 21 along the first direction near one end of the second electrode lead 3b, and the minimum distance L3 between the second part 33 of the first electrode lead 3a and the second part 33 of the second electrode lead 3b in the first direction is not less than 5 mm.

[0151] Exemplarily, the minimum distance L3 between the second part 33 of the first electrode lead 3a and the second part 33 of the second electrode lead 3b in the first direction can be, but is not limited to, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm or 20 mm.

[0152] The second part 33 of the first electrode lead 3a is close to one end of the second electrode lead 3b and extends beyond the edge of the first tab 21 along the first direction. Thus, the minimum distance L3 between the second part 33 of the first electrode lead 3a and the second part 33 of the second electrode lead 3b in the first direction is the closest distance between the part of the first electrical connection structure formed by the first electrode lead 3a and the first tab 21 located within the first housing wall 11 and the part of the second electrical connection structure formed by the second electrode lead 3b and the second tab 22 located within the first housing wall 11. Therefore, by defining the above distance L3, the reliability of electrical insulation within the first housing wall 11 is improved, thereby reducing the probability of mutual influence between the first electrical connection structure and the second electrical connection structure, and further improving the performance of the battery cell 20.

[0153] In some embodiments of the present application, as Figure 4 shown, along the first direction, the distance L1 between the central axes of the first part 31 of the first electrode lead 3a and the first part 31 of the second electrode lead 3b is not greater than 100 mm.

[0154] Exemplarily, along the first direction, the distance L1 between the central axes of the first part 31 of the first electrode lead 3a and the first part 31 of the second electrode lead 3b can be, but is not limited to, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 95 mm, 100 mm.

[0155] By defining the value range of the distance L1 between the central axes of the first part 31 of the first electrode lead 3a and the first part 31 of the second electrode lead 3b along the first direction, the first electrode lead 3a and the second electrode lead 3b are arranged more compactly, which is beneficial to improving the structural strength of the first housing wall 11. Moreover, the continuous space remaining inside and outside the first housing wall 11 is relatively large, which is conducive to the arrangement of other components, and further conducive to improving the volumetric energy density of the battery cell 20.

[0156] In some embodiments of the present application, as Figure 6 shown, along the first direction, the minimum distance L4 between the first part 31 of the first electrode lead 3a and the first part 31 of the second electrode lead 3b is not less than 2 mm.

[0157] The fact that the minimum distance L4 between the first part 31 of the first electrode lead 3a and the first part 31 of the second electrode lead 3b along the first direction is not less than 2 mm means that the distance between the edge of the end of the first part 31 of the first electrode lead 3a close to the second electrode lead 3b and the edge of the end of the first part 31 of the second electrode lead 3b close to the first electrode lead 3a is not less than 2 mm.

[0158] Exemplarily, the minimum distance L4 between the first part 31 of the first electrode lead 3a and the first part 31 of the second electrode lead 3b along the first direction may be, but is not limited to, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, or 4 mm.

[0159] In this way, the minimum distance L4 between the first part 31 of the first electrode lead 3a and the first part 31 of the second electrode lead 3b along the first direction is limited to a range not less than 2 mm, improving the reliability of electrical insulation between the first part 31 of the first electrode lead 3a and the first part 31 of the second electrode lead 3b, thereby reducing the probability of mutual influence between the first electrode lead 3a and the second electrode lead 3b, and further improving the performance of the battery cell 20.

[0160] In some embodiments of the present application, as Figure 6 shown, the end face of the end of the electrode terminal 30 of each electrode lead away from the accommodation cavity is the first end face 3111, and the end face of the end of the electrode terminal 30 close to the accommodation cavity is the second end face 3313, and the area of the second end face 3313 is smaller than the area of the first end face 3111.

[0161] Specifically, as Figure 7 shown, the electrode terminal 30 includes a terminal plate 311, a connecting column 313, and a terminal disk 312 that are connected in sequence. Figure 7 The structure formed by the part of the connecting column 313 that penetrates into the through hole 3110 of the terminal plate 311 and the terminal plate 311 in Figure 6 is the first part 31 in Figure 7 That is, the outer end face of the connecting column 313 and the surface of the terminal plate 311 facing away from the accommodation cavity form Figure 6 the first end face 3111 in Figure 7 The area of the first end face 3111 in Figure 7 is the area of the region surrounded by the outer edge of the surface of the terminal plate 311 facing away from the accommodation cavity. The second end face 3313 is the end face of the end of the electrode terminal 30 close to the accommodation cavity, that is, Figure 7 the surface of the terminal disk 312 away from the connecting column 313 in

[0162] The first end face 3111 is the outer end face of the electrode terminal 30 and is used for welding with the busbar structure. The second end face 3313 is the inner end face of the electrode terminal 30 and is used for welding with the adapter plate 314. Since the battery cell 20 needs to be welded with the busbar structure through the first end face 3111 to ensure current conduction during the grouping process, a relatively large welding mark area needs to be ensured, so the area of the first end face 3111 needs to be set relatively large, while a smaller area of the second end face 3313 can also ensure the welding mark area with the adapter plate 314.

[0163] In some embodiments of the present application, as Figure 6 shown, along the first direction, the ratio of the dimension L5 of the second end face 3313 to the dimension L6 of the first end face 3111 is in the range of 20% to 150%.

[0164] It can be understood that the second end face 3313 and the first end face 3111 of the electrode terminal 30 of the first electrode lead-out member 3a satisfy the above size conditions, that is, along the first direction, the ratio of the dimension L5 of the second end face 3313 to the dimension L6 of the first end face 3111 of the electrode terminal 30 of the first electrode lead-out member 3a is in the range of 20% to 150%. The second end face 3313 and the first end face 3111 of the electrode terminal 30 of the second electrode lead-out member 3b satisfy the above size conditions, that is, along the first direction, the ratio of the dimension L5 of the second end face 3313 to the dimension L6 of the first end face 3111 of the electrode terminal 30 of the second electrode lead-out member 3b is in the range of 20% to 150%.

[0165] Exemplarily, along the first direction, the ratio of the dimension L5 of the second end face 3313 to the dimension L6 of the first end face 3111 of the electrode terminal 30 can be, but is not limited to, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, 110%, 120%, 130%, 140% or 150%.

[0166] In this way, by limiting the ratio of the dimension L5 of the second end face 3313 to the dimension L6 of the first end face 3111 along the first direction to the range of 20% to 150%, it is beneficial to make the welding mark areas at the first end face 3111 and the second end face 3313 reach their respective standards, thereby improving the charge and discharge efficiency of the battery cell 20.

[0167] In some embodiments of the present application, as Figure 6 shown, along the first direction, the dimension L6 of the first end face 3111 is greater than the dimension L5 of the second end face 3313.

[0168] It can be understood that the second end face 3313 and the first end face 3111 of the electrode terminal 30 of the first electrode lead 3a satisfy the above-mentioned dimensional conditions, that is, along the first direction, the dimension L6 of the first end face 3111 of the electrode terminal 30 of the first electrode lead 3a is greater than the dimension L5 of the second end face 3313 of the electrode terminal 30 of the first electrode lead 3a. The second end face 3313 and the first end face 3111 of the electrode terminal 30 of the second electrode lead 3b satisfy the above-mentioned dimensional conditions, that is, along the first direction, the dimension L6 of the first end face 3111 of the electrode terminal 30 of the second electrode lead 3b is greater than the dimension L5 of the second end face 3313 of the electrode terminal 30 of the second electrode lead 3b.

[0169] In this way, it is beneficial for the area of the first end face 3111 to be larger than the area of the second end face 3313, so that the welding mark areas at both ends of the electrode terminal 30 meet their respective over-current standards.

[0170] In some embodiments of the present application, along the first direction, the ratio of the dimension L5 of the second end face 3313 to the dimension L6 of the first end face 3111 is in the range of 25% to 100%.

[0171] It can be understood that the second end face 3313 and the first end face 3111 of the electrode terminal 30 of the first electrode lead 3a satisfy the above-mentioned dimensional conditions, that is, along the first direction, the ratio of the dimension L5 of the second end face 3313 to the dimension L6 of the first end face 3111 of the electrode terminal 30 of the first electrode lead 3a is in the range of 25% to 100%. The second end face 3313 and the first end face 3111 of the electrode terminal 30 of the second electrode lead 3b satisfy the above-mentioned dimensional conditions, that is, along the first direction, the ratio of the dimension L5 of the second end face 3313 to the dimension L6 of the first end face 3111 of the electrode terminal 30 of the second electrode lead 3b is in the range of 25% to 100%.

[0172] Exemplarily, along the first direction, the ratio of the dimension L5 of the second end face 3313 to the dimension L6 of the first end face 3111 can be, but is not limited to, 25%, 35%, 45%, 55%, 65%, 75%, 85%, 95%, or 100%.

[0173] Since the battery cell 20 needs to be welded to another battery cell through the first end face 3111 to ensure current conduction during the grouping process, a relatively large welding mark area needs to be ensured. Therefore, the area of the first end face 3111 needs to be set relatively large, and a smaller area of the second end face 3313 can also ensure the welding mark area with the adapter plate 314. Therefore, by limiting the ratio of the size L5 of the second end face 3313 to the size L6 of the first end face 3111 in the first direction within the range of 25% to 100%, it is beneficial for the area of the first end face 3111 to be larger than the area of the second end face 3313, so that the welding mark areas at both connection points of the electrode terminals meet their respective current conduction standards, thereby improving the charge and discharge efficiency of the battery cell 20.

[0174] In some embodiments of the present application, along the first direction, the size L6 of the first end face 3111 is in the range of 20 mm to 50 mm, and / or the size L5 of the second end face 3313 is in the range of 10 mm to 30 mm.

[0175] It can be understood that the second end face 3313 and the first end face 3111 of the electrode terminal 30 of the first electrode lead-out member 3a satisfy the above size conditions, that is, along the first direction, the size L6 of the first end face 3111 of the electrode terminal 30 of the first electrode lead-out member 3a is in the range of 20 mm to 50 mm, and / or the size L5 of the second end face 3313 of the electrode terminal 30 of the first electrode lead-out member 3a is in the range of 10 mm to 30 mm. The second end face 3313 and the first end face 3111 of the electrode terminal 30 of the second electrode lead-out member 3b satisfy the above size conditions, that is, along the first direction, the size L6 of the first end face 3111 of the electrode terminal 30 of the second electrode lead-out member 3b is in the range of 20 mm to 50 mm, and / or the size L5 of the second end face 3313 of the electrode terminal 30 of the second electrode lead-out member 3b is in the range of 10 mm to 30 mm.

[0176] Exemplarily, the size L6 of the first end face 3111 can be, but is not limited to, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, 41 mm, 42 mm, 43 mm, 44 mm, 45 mm, 46 mm, 47 mm, 48 mm, 49 mm or 50 mm. The size L5 of the second end face 3313 can be, but is not limited to, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm or 30 mm.

[0177] Thus, by respectively defining the dimension L6 of the first end face 3111 and the dimension L5 of the second end face 3313, it is more conducive to making the weld mark areas at the two ends of the electrode terminal 30 meet their respective over-current standards, thereby improving the charge and discharge efficiency of the battery cell 20.

[0178] In some embodiments of the present application, along the first direction, the dimension L6 of the first end face 3111 is in the range of 25 mm to 40 mm, and / or the dimension L5 of the second end face 3313 is in the range of 10 mm to 25 mm.

[0179] It can be understood that the second end face 3313 and the first end face 3111 of the electrode terminal 30 of the first electrode lead-out member 3a satisfy the above-mentioned dimension conditions, that is, along the first direction, the dimension L6 of the first end face 3111 of the electrode terminal 30 of the first electrode lead-out member 3a is in the range of 25 mm to 40 mm, and / or the dimension L5 of the second end face 3313 of the electrode terminal 30 of the first electrode lead-out member 3a is in the range of 10 mm to 25 mm. The second end face 3313 and the first end face 3111 of the electrode terminal 30 of the second electrode lead-out member 3b satisfy the above-mentioned dimension conditions, that is, along the first direction, the dimension L6 of the first end face 3111 of the electrode terminal 30 of the second electrode lead-out member 3b is in the range of 25 mm to 40 mm, and / or the dimension L5 of the second end face 3313 of the electrode terminal 30 of the second electrode lead-out member 3b is in the range of 10 mm to 25 mm.

[0180] Thus, by further restricting the value ranges of the dimension L6 of the first end face 3111 and the dimension L5 of the second end face 3313, it is more conducive to making the weld mark areas at the two ends of the electrode terminal 30 meet their respective over-current standards, thereby improving the charge and discharge efficiency of the battery cell 20.

[0181] In some embodiments of the present application, as Figure 6 shown, the dimension L8 along the first direction of the surface of the tab facing the first housing wall 11 is in the range of 25 mm to 65 mm.

[0182] It can be understood that both the first tab 21 and the second tab 22 satisfy the above-mentioned dimension conditions, that is, the dimension L8 along the first direction of the surface of the first tab 21 facing the first housing wall 11 is in the range of 25 mm to 65 mm, and the dimension L8 along the first direction of the surface of the second tab 22 facing the first housing wall 11 is in the range of 25 mm to 65 mm.

[0183] Exemplarily, the dimension L8 of the surface of the tab facing the first housing wall 11 in the first direction may be, but is not limited to, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm, 36 m, 37 mm, 38 mm, 39 mm, 40 mm, 41 mm, 42 mm, 43 mm, 44 mm, 45 mm, 46 mm, 47 mm, 48 mm, 49 mm, 50 mm, 51 mm, 52 mm, 53 mm, 54 mm, 55 mm, 56 mm, 57 mm, 58 mm, 59 mm, 60 mm, 61 mm, 62 mm, 63 mm, 64 mm or 65 mm.

[0184] Thus, by limiting the dimension L8 of the surface of the tab facing the first housing wall 11 in the first direction within the range of 25 mm to 65 mm, it is beneficial to keep the welding mark area between the tab and the electrode lead-out member within a suitable range, and it will not occupy too much space, thereby facilitating the increase of the continuous space and improving the volume energy density of the battery cell 20.

[0185] In some embodiments of the present application, the dimension of the surface of the tab facing the first housing wall 11 in the first direction is within the range of 30 mm to 50 mm.

[0186] It can be understood that both the first tab 21 and the second tab 22 satisfy the above size conditions, that is, the dimension L8 of the surface of the first tab 21 facing the first housing wall 11 in the first direction is within the range of 30 mm to 50 mm, and the dimension L8 of the surface of the second tab 22 facing the first housing wall 11 in the first direction is within the range of 30 mm to 50 mm.

[0187] Thus, by limiting the dimension L8 of the surface of the tab facing the first housing wall 11 in the first direction within the range of 30 mm to 50 mm, it is more beneficial to keep the welding mark area between the tab and the electrode lead-out member within a suitable range, and it will not occupy too much space, thereby facilitating the increase of the continuous space and improving the volume energy density of the battery cell 20.

[0188] In some embodiments of the present application, as Figure 9 shown, along the first direction, the midpoint between the central axes of the first parts 31 of the first electrode lead-out member 3a and the second electrode lead-out member 3b deviates from the center of the first housing wall 11.

[0189] Thus, the continuous space on the side of the first housing wall 11 opposite to the deviation direction of the first electrode lead-out member 3a and the second electrode lead-out member 3b is larger, which is beneficial to the arrangement of other components and more beneficial to improving the volume energy density of the battery cell 20.

[0190] In some embodiments of the present application, as Figure 9 shown, along the first direction, the ratio of the distance between the midpoint of the central axis of the first part 31 of the first electrode lead 3a and the central axis of the first part 31 of the second electrode lead 3b to the center of the first housing wall 11 to the size of the first housing wall 11 is not greater than 47.5%.

[0191] Exemplarily, along the first direction, the ratio of the distance L9 between the midpoint of the central axis of the first part 31 of the first electrode lead 3a and the central axis of the first part 31 of the second electrode lead 3b to the center of the first housing wall 11 to the size L2 of the first housing wall 11 can be, but is not limited to, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47% or 47.5%.

[0192] In this way, the ratio of the distance L9 between the midpoint of the central axis of the first part 31 of the first electrode lead 3a and the central axis of the first part 31 of the second electrode lead 3b to the center of the first housing wall 11 to the size L2 of the first housing wall 11 along the first direction is limited to a range not greater than 47.5%, so that one end of the first housing wall 11 close to the deviation direction is sufficient to install the first electrode lead 3a and the second electrode lead 3b, and at the same time, the continuous space on the side of the first housing wall 11 opposite to the deviation direction of the first electrode lead 3a and the second electrode lead 3b can be made larger, which is beneficial to the arrangement of other components and more beneficial to improving the volume energy density of the battery cell 20.

[0193] In some embodiments of the present application, as Figure 9 shown, along the first direction, the ratio of the distance L9 between the midpoint of the central axis of the first part 31 of the first electrode lead 3a and the central axis of the first part 31 of the second electrode lead 3b and the center of the first housing wall 11 to the size L2 of the first housing wall 11 is in the range of 40% to 47.5%.

[0194] Exemplarily, along the first direction, the ratio of the distance L9 between the midpoint of the central axis of the first part 31 of the first electrode lead 3a and the central axis of the first part 31 of the second electrode lead 3b to the dimension L2 of the first housing wall 11 can be, but is not limited to, 40.2%, 40.5%, 40.7%, 41.3%, 41.5%, 41.8%, 42.1%, 42.5%, 42.6%, 43.4%, 43.5%, 43.9%, 44.4%, 44.5%, 44.8, 45.2, 45.5%, 46.3% or 46.5%.

[0195] Thus, along the first direction, the ratio of the distance L9 between the midpoint of the central axis of the first part 31 of the first electrode lead 3a and the central axis of the first part 31 of the second electrode lead 3b to the dimension L2 of the first housing wall 11 is limited to the range of 40% to 47.5%, so that one end of the first housing wall 11 close to the deviation direction is sufficient to install the first electrode lead 3a and the second electrode lead 3b, and at the same time, the continuous space on the side of the first housing wall 11 opposite to the deviation direction of the first electrode lead 3a and the second electrode lead 3b can be made larger, which is beneficial to the arrangement of other components and more conducive to improving the volumetric energy density of the battery cell 20.

[0196] In some embodiments of the present application, as Figure 6 shown, in the same electrode lead, the distance L7 between the central axis of the first part 31 and the edge of the end of the extension part 3312 far from the body part 3311 along the first direction is in the range of 30 mm to 80 mm.

[0197] It can be understood that along the first direction, the distance L7 between the central axis of the first part 31 of the first electrode lead 3a and the edge of the end of the extension part 3312 of the first electrode lead 3a far from the body part 3311 along the first direction is in the range of 30 mm to 80 mm. Along the first direction, the distance L7 between the central axis of the first part 31 of the second electrode lead 3b and the edge of the end of the extension part 3312 of the second electrode lead 3b far from the body part 3311 is in the range of 30 mm to 80 mm.

[0198] Exemplarily, in the same electrode lead, the distance between the central axis of the first part 31 and the edge of the end of the extension part 3312 far from the body part 3311 along the first direction can be, but is not limited to, in the range of 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm or 80 mm.

[0199] Thus, by limiting the distance L7 between the central axis of the first part 31 and the edge of the end of the extending part 3312 away from the body part 3311 in the same electrode lead-out member in the first direction within the range of 30 mm to 80 mm, it is beneficial to make the second part 33 of the electrode lead-out member have a sufficiently large welding area, thereby increasing the welding mark area between the second part 33 and the tab, improving the reliability of electrical connection, and enhancing the performance of the battery cell 20.

[0200] In some embodiments of the present application, in the same electrode lead-out member, the distance L7 between the central axis of the first part 31 and the edge of the end of the extending part 3312 away from the body part 3311 in the first direction is within the range of 40 mm to 60 mm.

[0201] It can be understood that along the first direction, the distance L7 between the central axis of the first part 31 of the first electrode lead-out member 3a and the edge of the end of the extending part 3312 of the first electrode lead-out member 3a away from the body part 3311 in the first direction is within the range of 40 mm to 60 mm. Along the first direction, the distance L7 between the central axis of the first part 31 of the second electrode lead-out member 3b and the edge of the end of the extending part 3312 of the second electrode lead-out member 3b away from the body part 3311 is within the range of 40 mm to 60 mm.

[0202] Exemplarily, in the same electrode lead-out member, the distance between the central axis of the first part 31 and the edge of the end of the extending part 3312 away from the body part 3311 in the first direction can be, but is not limited to, 40 mm, 41 mm, 42 mm, 43 mm, 44 mm, 45 mm, 46 mm, 47 mm, 48 mm, 49 mm, 50 mm, 51 mm, 52 mm, 53 mm, 54 mm, 55 mm, 56 mm, 57 mm, 58 mm, 59 mm or 60 mm.

[0203] Thus, by limiting the distance L7 between the central axis of the first part 31 and the edge of the end of the extending part 3312 away from the body part 3311 in the first direction within the range of 40 mm to 60 mm in the same electrode lead-out member, it is beneficial to make the second part 33 of the electrode lead-out member have a sufficiently large welding area, thereby increasing the welding mark area between the second part 33 and the tab, improving the reliability of electrical connection, and moreover, it will not occupy too much space in the first direction, which is also beneficial to improving the volumetric energy density.

[0204] In some embodiments of the present application, as Figure 4 shown, the dimension L2 of the first housing wall 11 in its length direction X is within 170 mm to 1200 mm.

[0205] Exemplarily, the dimension L2 of the first housing wall 11 in its length direction X can be, but is not limited to, 170 mm, 200 mm, 300 mm, 400 mm, 500 mm, 600 mm, 700 mm, 800 mm, 900 mm, 1000 mm, 1100 mm or 1200 mm.

[0206] To verify that the dimension of the electrical connection area at the first housing wall 11 of the battery cell 20 with the adapter plate arranged in the forward direction in the present application in the first direction is reduced compared to the dimension of the electrical connection area of the battery cell with the adapter plate arranged in the opposite direction in the prior art, the following takes the battery cell as shown in Figure 10 in the prior art and the battery cell 20 as shown in Figure 6 in the embodiment of the present application as an example for reasoning and verification.

[0207] Figure 6 For the battery cell 20 provided in some embodiments of the present application, the two adapter plates 314 in the battery cell 20 are arranged in the forward direction. The dimensions of the first end faces 3111 of the first electrode lead-out member 3a and the second electrode lead-out member 3b in the first direction are both represented by L6. The minimum distance between the first parts 31 of the first electrode lead-out member 3a and the second electrode lead-out member 3b in the first direction is represented by L4. The dimension of the second end face 3313 in the first direction is represented by L5. The minimum distance between the second parts 33 of the first electrode lead-out member 3a and the second electrode lead-out member 3b in the first direction is represented by L3. The distance between the central axis of the first part 31 and the edge of the extending part 3312 far from the body part 3311 in the first direction is represented by L7. Therefore, the dimension of the total space occupied by the first electrode lead-out member 3a and the second electrode lead-out member 3b in the first direction is The distance between the central axes of the first parts 31 of the first electrode lead-out member 3a and the second electrode lead-out member 3b in the first direction is

[0208] Figure 10 For a battery cell in the prior art, the electrode terminals of the battery cell are connected to the tabs through the adapter plates, and the two adapter plates are distributed in opposite directions. Figure 10 In , L7’ represents the distance between the central axis of the electrode terminal and the outermost end of the adapter plate in the first direction, L3’ represents the shortest distance between the internal electrical connection structures, L6’ represents the dimension of the part of the electrode terminal located outside the housing in the first direction, and L8’ represents the dimension of the tab in the first direction. Therefore, Figure 10 the dimension of the electrical connection area of the battery cell in in the first direction is The distance between the central axes of the two pole columns is 2×L7’ + L3’.

[0209] Considering the process and the requirements for overcurrent of internal and external currents, set L7 > L6, L7 > L5, L7' > L6', L7' > L8'; for more convenient comparison, set L7 = L7', L6 = L6', L3 = L3'; as can be seen from the foregoing, L6 > L5. Figure 10 The dimension of the electrical connection area in Figure 10 along the first direction and Figure 6 The difference in the dimension of the electrical connection area in Figure 6 along the first direction is Figure 10 The distance between the central axes of the pole columns in Figure 10 and Figure 6 The distance between the central axes of the electrode terminals 30 in Figure 6 is

[0210] It can be seen that Figure 10 The distance between the central axes of the electrode terminals in Figure 10 is greater than Figure 6 The distance between the central axes of the electrode terminals 30 in Figure 6 , thus proving that the electrode terminals 30 in the embodiments of the present application are more compact, which is beneficial to improving the structural strength of the first housing wall 11. Figure 10 The dimension of the electrical connection area in Figure 10 along the first direction and Figure 6 The difference in the dimension of the electrical connection area in Figure 6 along the first direction is greater than 0, thus proving that the space occupied by the first electrode lead 3a and the second electrode lead 3b in the embodiments of the present application in the first direction is reduced, making the continuous space on the inner and outer sides of the first housing wall 11 relatively large, which is beneficial to the arrangement of other components, and further beneficial to improving the volume energy density of the battery cell 20.

[0211] The second aspect of the present application provides a battery 100, including at least one battery cell 20 provided by the first aspect.

[0212] Since the battery 100 includes the battery cell 20, the battery 100 has all the beneficial effects of the battery cell 20. Therefore, the battery 100 has high structural strength and high volume energy density.

[0213] The third aspect of the present application provides an energy storage device, including at least one battery cell 20 provided by the first aspect or a battery 100 provided by the second aspect.

[0214] Since the energy storage device includes the battery cell 20 or the battery 100, the energy storage device has all the beneficial effects of the battery cell 20 or the battery 100. Therefore, the energy storage device has high structural strength and is beneficial to reducing the accommodation space for accommodating the battery cell 20 or the battery 100 in the energy storage device, or the energy storage device can accommodate a larger-capacity battery cell 20 or battery 100 in a limited accommodation space.

[0215] The fourth aspect of the present application provides an electrical device, which includes the battery cell 20 provided in the first aspect for providing electrical energy or the battery 100 provided in the second aspect.

[0216] Since the electrical device includes the battery cell 20 or the battery 100, the electrical device has all the beneficial effects of the battery cell 20 or the battery 100. Therefore, the structural strength of the electrical device is high, and it is beneficial to reduce the accommodation space of the electrical device for accommodating the battery cell 20 or the battery 100, or the electrical device can accommodate a battery cell 20 or a battery 100 with a larger capacity in a limited accommodation space.

[0217] Next, specific examples of some embodiments of the present application will be described in conjunction with the accompanying drawings.

[0218] As a specific example, the battery cell 20 includes a housing (housing 1), the housing has an end cap (first housing wall 11) and an accommodation cavity, an electrode assembly (electrode assembly 2) is accommodated in the accommodation cavity, and the end cap is provided with two pole posts (electrode terminals 30) spaced apart along the length direction of the end cap (the length direction X of the first housing wall 11). One end of the two pole posts located in the accommodation cavity is respectively connected to two pole ears (first pole ear 21 and second pole ear 22) of the electrode assembly through a connecting piece (connecting piece 314). The two connecting pieces extend from the end connected to the pole posts towards the same side, so that the connecting pieces are arranged in the same direction, and the ratio of the distance between the central axes of the two pole posts to the dimension of the end cap along the length direction is not greater than 60%. Arranging the pole posts close to each other can improve the structural strength of the end cap, and at the same time can leave a relatively large space on the end cap for arranging other structures. At the same time, setting without a connecting piece can further increase the space for arranging structures on the end cap and reduce the space in the height direction.

[0219] The above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A battery cell, characterized in that: include: A housing having a first housing wall and a receiving cavity; An electrode assembly is disposed in the accommodating cavity, wherein the electrode assembly has at least two pole tabs, wherein the at least two pole tabs include a first pole tab and a second pole tab; at least two electrode lead-out members, including a first electrode lead-out member and a second electrode lead-out member, both of which are arranged on the first housing wall and arranged along a first direction, Each of the electrode lead-out members includes a first portion located outside the shell, a second portion located inside the shell, and an intermediate portion connected between the first portion and the second portion, the second portion of the first electrode lead-out member is connected to the first electrode tab, and the second portion of the second electrode lead-out member is connected to the second electrode tab. In the first direction, a ratio of a distance between a central axis of the first portion of the first electrode lead-out member and a central axis of the first portion of the second electrode lead-out member to a size of the first housing wall is not greater than 60%, The second portion of each electrode lead-out member includes a main body portion overlapping with the first portion in the wall thickness direction of the first shell wall and an extension portion extending beyond the first portion along the first direction, the extension portion of the first electrode lead-out member is located on the side of the main body portion of the first electrode lead-out member facing the second electrode lead-out member, and the extension portion of the second electrode lead-out member is located on the side of the main body portion of the second electrode lead-out member facing away from the first electrode lead-out member.

2. The battery cell according to claim 1, characterized in that: Each of the electrode lead-out parts includes an electrode terminal passing through a terminal mounting hole of the first shell wall and a transition piece connected to one end of the electrode terminal located in the accommodating cavity, the portion of the electrode terminal located on the outside of the shell is the first portion, the portion located in the terminal mounting hole is the middle portion, and the portion of the electrode terminal located on the inside of the shell and the transition piece form the second portion.

3. The battery cell according to claim 1, characterized in that: The second part is an integrally formed structure.

4. The battery cell according to any one of claims 1 to 3, characterized in that: One of the first electrode tab and the second electrode tab is a positive electrode tab, and the other is a negative electrode tab.

5. The battery cell according to any one of claims 1 to 3, characterized in that: The first pole tab and the second pole tab are both positive pole tabs, or the first pole tab and the second pole tab are both negative pole tabs.

6. The battery cell according to claim 5, characterized in that: The first electrode tab and the second electrode tab are formed as one body.

7. The battery cell according to claim 4, characterized in that: The first electrode tab and the second electrode tab are arranged at intervals.

8. The battery cell according to claim 5, characterized in that: The first electrode tab and the second electrode tab are arranged at intervals.

9. The battery cell according to claim 7 or 8, characterized in that: A minimum distance between the second portion of the first electrode lead-out member and the second portion of the second electrode lead-out member in the first direction is not less than 5 mm.

10. The battery cell according to claim 9, characterized in that: Along the first direction, a distance between a central axis of the first portion of the first electrode lead-out member and a central axis of the first portion of the second electrode lead-out member is no greater than 100 mm.

11. The battery cell according to claim 9, characterized in that: Along the first direction, a minimum distance between the first portion of the first electrode lead-out member and the first portion of the second electrode lead-out member is not less than 2 mm.

12. The battery cell according to claim 2, characterized in that: The end surface of the electrode terminal of each electrode lead-out member that is away from the accommodating cavity is a first end surface, and the end surface that is close to the accommodating cavity is a second end surface. The area of ​​the second end surface is smaller than the area of ​​the first end surface.

13. The battery cell according to claim 12, characterized in that: Along the first direction, a ratio of a size of the second end surface to a size of the first end surface is in a range of 20% to 150%.

14. The battery cell according to claim 12, characterized in that: Along the first direction, a ratio of a size of the second end surface to a size of the first end surface is in a range of 25% to 100%.

15. The battery cell according to any one of claims 12 to 14, characterized in that: Along the first direction, a size of the first end surface is in a range of 20 mm to 50 mm, and / or a size of the second end surface is in a range of 10 mm to 30 mm.

16. The battery cell according to any one of claims 12 to 14, characterized in that: Along the first direction, a size of the first end surface is in a range of 25 mm to 40 mm, and / or a size of the second end surface is in a range of 10 mm to 25 mm.

17. The battery cell according to claim 6, characterized in that: A dimension of a surface of the pole tab facing the first housing wall along the first direction is in a range of 25 mm to 65 mm.

18. The battery cell according to claim 6, characterized in that: A dimension of a surface of the pole tab facing the first housing wall along the first direction is in a range of 30 mm to 50 mm.

19. The battery cell according to any one of claims 1 to 3, 6 to 8, 10 to 14, 17, and 18, characterized in that: Along the first direction, a midpoint between a central axis of the first portion of the first electrode lead-out member and a central axis of the first portion of the second electrode lead-out member is disposed away from a center of the first housing wall.

20. The battery cell according to claim 19, characterized in that: Along the first direction, a ratio of a distance between a midpoint between a central axis of the first portion of the first electrode lead-out member and a central axis of the first portion of the second electrode lead-out member and a center of the first housing wall to a size of the first housing wall is not greater than 47.5%.

21. The battery cell according to claim 19, characterized in that: Along the first direction, a ratio of a distance between a midpoint between a central axis of the first portion of the first electrode lead-out member and a central axis of the first portion of the second electrode lead-out member and a center of the first shell wall to a size of the first shell wall is in a range of 40% to 47.5%.

22. The battery cell according to any one of claims 1 to 3, 6 to 8, 10 to 14, 17, 18, 20, and 21, characterized in that: In the same electrode lead-out member, a distance between a central axis of the first portion and an edge of the extending portion away from the main body portion along the first direction is in a range of 30 mm to 80 mm.

23. The battery cell according to any one of claims 1 to 3, 6 to 8, 10 to 14, 17, 18, 20, and 21, characterized in that: In the same electrode lead-out member, a distance between a central axis of the first portion and an edge of the extending portion away from the main body portion along the first direction is in a range of 40 mm to 60 mm.

24. A battery, characterized in that: include: At least one battery cell according to any one of claims 1 to 23.

25. An energy storage device, characterized in that: include: At least one battery cell according to any one of claims 1 to 23 or a battery according to claim 24.

26. An electrical device, characterized in that: The electrical device comprises the battery cell according to any one of claims 1 to 23 or the battery according to claim 24 for providing electrical energy.

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