Battery cell, cover plate assembly, battery, and electrical device

Abstract

Embodiments of the present disclosure provide a battery cell, a cover plate assembly, a battery, and an electrical device. The battery cell comprises a housing and an electrode assembly; the housing is provided with an installation cavity, and the electrode assembly is arranged in the mounting cavity; a clearance area is arranged on a first wall of the housing; the side of the clearance area facing the electrode assembly is recessed to form a clearance slot, and the side of the clearance area away from the electrode assembly protrudes out to form a protrusion; and a portion of the electrode assembly extends into the clearance slot.

Description

Battery cell, cover plate assembly, battery and power-consuming device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on the Chinese patent application with application number 202311264394.7, application date September 27, 2023, and invention name “A battery cell, cover assembly, battery and electrical device”, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into the present disclosure as a reference. Technical Field

[0003] The present disclosure relates to the field of battery technology, and in particular to a battery cell, a cover plate assembly, a battery, and an electrical device. Background Art

[0004] In recent years, batteries, as an important part of the new energy industry, have received more and more attention. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in energy storage fields.

[0005] The battery is provided with multiple battery cells, which are electrically connected in series or in parallel to achieve charging and discharging.

[0006] When the battery installation space is fixed, the number of battery cells loaded in the battery is closely related to the battery capacity.

[0007] Summary of the Invention

[0008] In view of this, the embodiments of the present disclosure are intended to provide a battery cell, a cover plate assembly, a battery, and an electrical device that are designed to improve the space utilization within the battery and the battery energy density.

[0009] To achieve the above objectives, the technical solution of the embodiment of the present disclosure is implemented as follows:

[0010] An embodiment of the present disclosure provides a battery cell, the battery cell comprising:

[0011] A housing having a mounting cavity;

[0012] an electrode assembly, disposed in the mounting cavity;

[0013] An escape area is provided on the first wall of the shell. The escape area is recessed on one side toward the electrode assembly to form an escape groove, and protrudes on the side away from the electrode assembly to form a protrusion. A portion of the electrode assembly extends into the escape groove.

[0014] The battery cell in the embodiment of the present disclosure forms an avoidance groove on the shell for accommodating a part of the electrode assembly, and a protrusion corresponding to the accommodating groove. This helps to reduce the redundant volume in the installation cavity while ensuring that the volume of the installation cavity meets the requirements for placing the electrode assembly, making the space in the battery cell more compact, thereby helping to reduce the total volume and outer contour dimensions of the battery cell, and further helping to increase the number of battery cells that can be accommodated in the battery, thereby improving the energy density and space utilization of the battery.

[0015] In some embodiments, the electrode assembly includes a tab and a pole piece, the tab being located at the edge of the pole piece facing the inner wall of the mounting cavity, and extending into the avoidance groove. This facilitates adapting the spatial shape of the mounting cavity to the outer contour of the pole piece, thereby reducing the spatial volume of the mounting cavity and the overall size of the battery cell, and preventing compression between the inner wall of the avoidance groove and the pole piece, thereby enabling normal charging and discharging of the battery cell.

[0016] In some embodiments, there are two tabs with opposite polarities, and two avoidance areas. The two tabs are respectively located in the avoidance groove of one avoidance area. This reduces the probability of contact between the two tabs, thereby reducing the probability of a short circuit, thereby effectively improving the safety of the battery cell.

[0017] Alternatively, the number of the avoidance areas is one, and the two pole ears are located in the avoidance groove of the avoidance area and are spaced apart. In this way, on the one hand, only a protrusion and avoidance groove corresponding to the avoidance area need to be manufactured on the cover assembly, thereby reducing production costs; on the other hand, it is convenient for the two pole ears to enter the avoidance groove synchronously during the process of the cover assembly being covered on the opening, thereby simplifying the installation steps.

[0018] In some embodiments, there are two escape areas, each located at one end of the battery cell along its length. This maximizes the spacing between the two escape areas, thereby facilitating the formation of a relatively large flat area on the outer surface of the cover assembly between the two escape areas. Furthermore, given a given battery volume, other components with larger outer dimensions can be easily arranged within this area, facilitating the placement of other components within the battery. This also helps reduce the battery's volume, improves internal space utilization, and makes the battery more compact.

[0019] In some embodiments, there is one avoidance area, and the distance between the avoidance area and one end of the battery cell in the longitudinal direction is greater than the distance between the avoidance area and the other end of the battery cell in the longitudinal direction. This allows for the placement of larger components within the battery within a given internal volume, facilitating the placement of other components within the battery. This also helps reduce the battery's volume, improves internal space utilization, and makes the battery more compact.

[0020] In some embodiments, the avoidance area is located at one end of the battery cell along the length of the battery cell. This maximizes the area of ​​the outer surface of the housing at the other end of the battery cell along its length, thereby facilitating the placement of other battery components with larger outer dimensions within this area. This facilitates the placement of other battery components and helps reduce the battery's volume, improving internal space utilization and making the battery more compact.

[0021] In some embodiments, the shell includes a surrounding shell and a cover assembly, one side of the surrounding shell is open to form an opening, the cover assembly includes a cover body and an explosion-proof valve, the cover body is covered on the opening to jointly form the installation cavity, the first wall is located on the cover body, and the explosion-proof valve is located on the cover body.

[0022] In this way, by setting the avoidance area on the cover assembly 13, it is beneficial to allow a part of the electrode assembly to directly enter or escape from the avoidance groove during the installation and removal of the cover assembly, thereby improving the installation and removal efficiency of the battery cell. At the same time, it is convenient to install the explosion-proof valve synchronously with the assembly of the cover assembly, thereby improving the assembly efficiency of the battery cell.

[0023] In some embodiments, the explosion-proof valve is provided on the protrusion, and the protrusion is located at one end of the cover body along the length direction of the battery cell.

[0024] This helps improve the space utilization rate of the space within the avoidance groove, reduces the redundant volume within the installation cavity, and makes the space within the battery cell more compact, thereby reducing the total volume and external dimensions of the battery cell, thereby increasing the number of battery cells that can be accommodated in the battery, improving the battery's energy density and space utilization rate. Furthermore, the area of ​​the outer surface of the cover body located at the other end of the battery cell in the longitudinal direction can be made larger, making it easier to arrange other components with larger external dimensions in this area, thus providing convenience for the arrangement of other components in the battery.

[0025] In some embodiments, the explosion-proof valve is located on the cover body, and the explosion-proof valve and the protrusion are respectively located at one end of the cover body along the length direction of the battery cell. This helps to minimize the volume of the protrusion.

[0026] In some embodiments, the electrode assembly includes a pole ear and a pole piece, the pole ear is arranged at the edge of one end of the pole piece facing the cover body, and the pole ear is located at one end of the pole piece along the length direction of the battery cell so that the pole ear extends into the avoidance groove.

[0027] In this way, the arrangement of the tabs is adapted to the arrangement of the protrusions, thereby facilitating improved space utilization within the installation cavity.

[0028] In some embodiments, the cover plate assembly includes a post, which is disposed on the protrusion and electrically connected to the electrode assembly. This further improves the space utilization within the avoidance groove, helps reduce redundant volume within the installation cavity, and makes the space within the battery cell more compact, thereby helping to reduce the total volume and external dimensions of the battery cell, thereby increasing the number of battery cells that can be accommodated in the battery, improving the battery's energy density and space utilization.

[0029] In some embodiments, a first center plane of the battery cell along its length direction coincides with a third center plane of the protrusion along the length direction of the battery cell.

[0030] This helps to make the structure of the battery cells symmetrical about the first center plane, and facilitates adjustment of the placement directions of multiple battery cells when they are arranged in a battery module, thereby improving the adaptability of the battery cells.

[0031] In some embodiments, the spacing between the first center plane of the battery cell along its length direction and the third center plane of the protrusion along the length direction of the battery cell is a first spacing, and the ratio of the first spacing to the length dimension of the battery cell is greater than 0 and does not exceed 47.5%. This is conducive to forming a large flat area of ​​the first wall along the length direction of the battery cell, making it easier for other components with larger outer contour dimensions in the battery to be arranged in this area, thereby providing convenience for the arrangement of other components in the battery.

[0032] In some embodiments, a ratio of the first spacing to the length of the battery cell is greater than 0 and does not exceed 5%;

[0033] Alternatively, the ratio of the first distance to the length of the battery cell ranges from 40% to 47.5%.

[0034] This is further beneficial for forming a relatively large flat area on both sides or one side of the protrusion along the length direction of the battery cell, making it easier for other components in the battery with relatively large outer dimensions to be arranged in this area.

[0035] In some embodiments, the spacing between the second center plane of the battery cell along its width direction and the fourth center plane of the protrusion along the width direction of the battery cell is a second spacing, and the ratio of the second spacing to the width dimension of the battery cell is greater than 0 and does not exceed 25%. This is conducive to allowing the dimension of the avoidance groove along the width direction to accommodate a part of the electrode assembly and leave a certain redundancy, so as to facilitate the electrode assembly to extend into or out of the avoidance groove.

[0036] In some embodiments, a ratio of the second spacing to the width of the battery cell is greater than 0 and does not exceed 5%.

[0037] In this way, it is more conducive to better ensure that the dimension of the avoidance groove along the width direction accommodates a part of the electrode assembly and leaves redundancy.

[0038] In some embodiments, the ratio of the dimension of the protrusion along the length direction of the battery cell to the length dimension of the battery cell is not less than 5% and less than 100%. This, on the one hand, helps ensure that the space in the avoidance groove meets the requirement of accommodating a portion of the electrode assembly; on the other hand, it avoids the situation where the dimension of the protrusion along the length direction is too long, so that the edge of the open opening cannot limit the cover plate assembly along the length direction, which helps to maintain the position of the cover plate assembly stable during the assembly process.

[0039] And / or, the ratio of the dimension of the protrusion along the width direction of the battery cell to the width dimension of the battery cell is not less than 30% and less than 100%. In this way, on the one hand, it is beneficial to ensure that the space in the avoidance groove meets the requirements of accommodating a part of the electrode assembly; on the other hand, it avoids the situation where the dimension of the protrusion along the width direction is too long, so that the edge of the open opening cannot limit the cover assembly along the width direction, which is beneficial to keep the position of the cover assembly stable during the assembly process.

[0040] In some embodiments, the ratio of the height of the protrusion to the total height of the battery cell is no more than 35%. This is beneficial for ensuring that the space in the avoidance groove meets the requirement of accommodating a part of the electrode assembly along the height direction, while reducing the problem of the protrusion being too high and being unfavorable for the arrangement of other components in the battery. At the same time, it is beneficial for reducing the size of the tab.

[0041] In some embodiments, the battery cells include explosion-proof valves, which are located on the housing. This allows the housing to have ample space for installation. This facilitates the placement of explosion-proof valves with a large opening flow rate, further reducing the probability of battery cell explosion. Furthermore, it facilitates aligning the direction of high-temperature airflow after the explosion-proof valve is opened with the arrangement of the battery cells within the battery, thereby improving battery safety.

[0042] In some embodiments, the explosion-proof valve is located on a side of the housing away from the protrusion. This helps to keep the high-temperature airflow away from other components in the battery that are electrically connected to the cover assembly, thereby reducing the impact of the high-temperature airflow on other battery cells and other components, reducing the probability of a chain reaction caused by thermal runaway in the battery, and improving the safety of the battery.

[0043] Alternatively, the battery cell has a cubic structure, and the explosion-proof valve is located on the wall of the shell adjacent to the first wall. In this way, the spray direction of the high-temperature airflow ejected from the explosion-proof valve is away from other components in the battery that are electrically connected to the cover assembly, thereby reducing the impact of the high-temperature airflow on other battery cells and other components, reducing the probability of a chain reaction due to thermal runaway in the battery, and improving the safety of battery use.

[0044] An embodiment of the present disclosure also provides a cover plate assembly for a battery cell, the cover plate assembly including a cover plate body, the cover plate body being provided with an avoidance area, the avoidance area being recessed on one side along the thickness direction to form an avoidance groove, and being protruding on the other side to form a bulge, thereby facilitating making the space inside the battery cell more compact, thereby facilitating reducing the total volume and outer contour dimensions of the battery cell.

[0045] In some embodiments, there are two escape areas, one located at one end of the cover plate body along its length. This facilitates forming a relatively large, flat area on the outer surface of the cover plate assembly between the two escape areas, making it easier to utilize this area for arranging other components in the battery. This maximizes the area of ​​the outer surface of the cover plate assembly located at the other end of the cover plate body along its length, making it easier to arrange other components with larger outer dimensions in this area, thus facilitating the placement of other components in the battery.

[0046] In some embodiments, there is one escape area, located at one end of the cover plate body along its length. This maximizes the area of ​​the outer surface of the cover plate assembly at the other end of the cover plate body along its length, thereby facilitating the placement of other battery components with larger outer dimensions within this area.

[0047] In some embodiments, the cover plate assembly includes an explosion-proof valve, which is provided on the protrusion. This helps to improve the space utilization rate of the space in the avoidance groove and makes the structure of the cover plate assembly more compact.

[0048] And / or, the explosion-proof valve is located on the cover body and is spaced apart from the protrusion, which is beneficial for minimizing the volume of the protrusion.

[0049] In some embodiments, the cover plate assembly includes a pole, and the pole is provided on the protrusion, which is beneficial to improving the space utilization in the avoidance groove.

[0050] An embodiment of the present disclosure further provides a battery, comprising a plurality of the battery cells described in any one of the aforementioned embodiments.

[0051] In this way, by adopting the battery cells in the aforementioned embodiments, the number of battery cells that can be accommodated in the battery can be effectively increased, thereby improving the energy density and space utilization of the battery.

[0052] An embodiment of the present disclosure further provides an electrical device, which includes the battery in the aforementioned embodiment, and the battery serves as a power source for the electrical device.

[0053] In this way, by adopting the battery in the aforementioned embodiment, the power consumption endurance of the electrical device can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] FIG1 is a schematic diagram of an embodiment of the present disclosure in which the electrical device is a car;

[0055] FIG2 is a schematic diagram of a battery in one embodiment of the present disclosure;

[0056] FIG3 is a schematic diagram of a battery cell in the first embodiment of the present disclosure;

[0057] FIG4 is an exploded view of the first embodiment of the present disclosure;

[0058] FIG5 is a partial cross-sectional schematic diagram of the first embodiment of the present disclosure;

[0059] FIG6 is a schematic diagram of a battery cell in a second embodiment of the present disclosure;

[0060] FIG7 is a partial cross-sectional schematic diagram of a second embodiment of the present disclosure;

[0061] FIG8 is an exploded view of the second embodiment of the present disclosure;

[0062] FIG9 is a schematic diagram of a battery cell in a third embodiment of the present disclosure;

[0063] FIG10 is a schematic diagram of a battery cell in a fourth embodiment of the present disclosure;

[0064] FIG11 is a schematic diagram of the positions of the first center plane, the second center plane, the third center plane, and the fourth center plane in one embodiment of the present disclosure;

[0065] FIG12 is a schematic diagram showing the relationship between the protrusion and the total height of the battery cell in one embodiment of the present disclosure;

[0066] FIG13 is a schematic diagram of a battery cell in a fifth embodiment of the present disclosure;

[0067] FIG14 is a schematic diagram of a battery cell in a sixth embodiment of the present disclosure;

[0068] FIG15 is a schematic diagram of a battery cell in a seventh embodiment of the present disclosure;

[0069] FIG16 is a schematic diagram of a battery cell in an eighth embodiment of the present disclosure.

[0070] Description of Reference Numerals

[0071] Vehicle 1000; battery 100; bottom cover 101; top cover 102; controller 200; motor 300;

[0072] Battery cell 10; mounting cavity 10a; housing 11; opening 11a; first wall 11b; electrode assembly 12; pole tab 121; pole piece 122; cover assembly 13; enclosure 14; avoidance area 13a; avoidance groove 13b; cover body 131; first center plane 131a; second center plane 131b; protrusion 132; third center plane 132a; fourth center plane 132b; explosion-proof valve 133; pole post 134. DETAILED DESCRIPTION

[0073] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of the present disclosure can be combined with each other, and the detailed description in the specific implementation methods should be understood as an explanation of the purpose of the present disclosure and should not be regarded as an improper limitation on the present disclosure.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present disclosure belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the terms "including" and "having" and any variations thereof in the specification and claims of the present disclosure and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0075] In the description of the embodiments of the present disclosure, technical terms such as "first," "second," and "third" are used solely to distinguish different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0076] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0077] In the description of the embodiments of the present disclosure, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0078] In the description of the embodiments of the present disclosure, the technical term "length direction" orientation or position relationship is based on the orientation or position relationship shown in Figures 3, 9, 10 and 11, the technical term "width direction" orientation or position relationship is based on the orientation or position relationship shown in Figures 3 and 11, and the technical term "height direction" orientation or position relationship is based on the orientation or position relationship shown in Figure 3. It is only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, it cannot be understood as a limitation on the embodiments of the present disclosure.

[0079] In the description of the embodiments of the present disclosure, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal connectivity between two components or interaction between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure based on specific circumstances.

[0080] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0081] The following describes the embodiments of the present disclosure in detail.

[0082] Batteries are increasingly used in everyday life and industry. They are not only used in energy storage systems like hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. As battery applications continue to expand, market demand is also growing.

[0083] The battery cell is equipped with an electrode assembly, and the outer contour of the electrode assembly is irregular. For example, the electrode assembly includes a tab and a pole piece, wherein the tab is provided on the pole piece and protrudes from the outer surface of the pole piece, so that the three-dimensional dimensions of the outer contour of the pole piece cannot represent the three-dimensional dimensions of the outer contour of the electrode assembly. However, the space in the battery cell used to accommodate the electrode assembly is of a regular shape for ease of manufacturing. Therefore, in order to accommodate the electrode assembly, the three-dimensional dimensions of the space in the battery cell used to accommodate the electrode assembly will be significantly larger than the three-dimensional dimensions of the outer contour of the electrode assembly, forming a certain redundant volume, resulting in an increase in the volume of the battery cell and a reduction in the number of battery cells that can be arranged within a certain spatial volume range, resulting in low energy density and low space utilization of the battery.

[0084] The embodiments of the present disclosure are intended to provide a battery cell, which expands the volume of the space inside the battery cell by arranging a protrusion on the shell of the battery cell and forming a cavity inside the protrusion that is connected to the space inside the shell for accommodating the electrode assembly, so as to enable the protruding part of the electrode assembly to enter the cavity inside the protrusion, thereby reducing the three-dimensional size of the outer contour of the shell.

[0085] Specifically, an embodiment of the present disclosure provides a battery cell 10 . Referring to FIG. 3 , FIG. 4 and FIG. 5 , the battery cell 10 includes a housing 11 and an electrode assembly 12 .

[0086] The shell 11 is provided with an installation cavity 10a; the electrode assembly 12 is arranged in the installation cavity 10a; an avoidance area 13a is provided on the first wall 11b of the shell 11, and the avoidance area 13a is recessed on the side facing the electrode assembly 12 to form a avoidance groove 13b, and protrudes on the side away from the electrode assembly 12 to form a protrusion 132, and a part of the electrode assembly 12 extends into the avoidance groove 13b.

[0087] The housing 11 provides an installation space for the electrode assembly 12 and plays a protective role. At the same time, the installation cavity 10a of the housing 11 is used for filling the electrolyte.

[0088] The specific material of the housing 11 is not limited and can be steel, aluminum, composite metal materials, etc.

[0089] The electrode assembly 12 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 10, active ions (e.g., lithium ions) in the electrolyte are intercalated and released between the positive and negative electrodes, generating electrochemical reactions. The separator, positioned between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0090] The first wall 11 b refers to one of the outer surfaces of the housing 11 .

[0091] The avoidance area 13a forms an avoidance groove 13b on the side facing the electrode assembly 12, and the space within the avoidance groove 13b is used to accommodate a portion of the electrode assembly 12; and a protrusion 132 is formed on the side away from the electrode assembly 12, so that when the size of the first wall 11b is constant, the first wall 11b can be as close to the electrode assembly 12 as possible, and the volume of the avoidance groove 13b is increased, thereby effectively reducing the volume within the installation cavity 10a while allowing as much as possible of the electrode assembly 12 to extend into the avoidance groove 13b.

[0092] It can be understood that the protruding direction of the protrusion 132 is the same as the recessed direction of the avoidance groove 13b.

[0093] The battery cell 10 in the embodiment of the present disclosure forms an avoidance groove 13b for accommodating a part of the electrode assembly 12 on the first wall 11b, and a protrusion 132 corresponding to the accommodating groove. This helps to reduce the redundant volume in the installation cavity 10a while ensuring that the volume of the installation cavity 10a meets the requirements for accommodating the electrode assembly 12, making the space in the battery cell 10 more compact, thereby helping to reduce the total volume and outer contour dimensions of the battery cell 10, and further helping to increase the number of battery cells 10 that can be accommodated in the battery, thereby improving the energy density and space utilization of the battery.

[0094] The battery cells in the embodiments of the present disclosure are combined in plurality to form a battery module or a battery.

[0095] The battery module can be used in, but is not limited to, electrical devices such as vehicles, ships, or aircraft. A power supply system for the electrical device can be composed of the battery cells and batteries of the embodiments of the invention.

[0096] Batteries can also be used, but are not limited to, in energy storage power systems, vehicles, ships, aircraft, and other electrical devices. Batteries can provide a higher total energy capacity. Furthermore, batteries are formed by placing multiple cells in a sealed enclosure, providing more reliable dust and water resistance. Therefore, they can be used in harsh, humid, and even submerged environments.

[0097] The embodiments of the present disclosure provide an electrical device including the above-mentioned battery module or battery for providing electrical energy. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0098] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present disclosure is taken as an example of a vehicle 1000. The following description is made with reference to the accompanying drawings.

[0099] FIG1 is a schematic structural diagram of a vehicle 1000 provided in an embodiment of the present disclosure. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. As shown in FIG1 , a battery 100 is provided inside the vehicle 1000. The battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle 1000 during driving.

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

[0101] Figure 2 is a perspective exploded view of a battery 100 according to an embodiment of the present disclosure. The battery 100 includes a bottom cover 101, a top cover 102, and at least one battery cell 10. The top cover 102 covers the bottom cover 101, thereby forming a storage space for the battery cell 10 between the bottom cover 101 and the top cover 102.

[0102] In the battery 100, there may be multiple battery cells 10, and the multiple battery cells 10 may be connected in series, in parallel, or in a mixed connection. Mixed connection means that the multiple battery cells 10 are connected both in series and in parallel. The multiple battery cells 10 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 10 is placed in the storage space formed by the bottom cover 101 and the top cover 102. Of course, the battery 100 may also be a battery module formed by first connecting multiple battery cells 10 in series, in parallel, or in a mixed connection, and then the multiple battery modules are further connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the storage space formed by the bottom cover 101 and the top cover 102. The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component for achieving electrical connection between the multiple battery cells 10.

[0103] In the embodiment of the present disclosure, the battery cell 10 may be a secondary battery. A secondary battery refers to a battery cell 10 that can be continuously used by activating active materials by charging after the battery cell 10 is discharged.

[0104] The battery cell 10 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 storage battery, etc., which is not limited in the embodiments of the present disclosure.

[0105] As an example, the battery cell 10 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 polygonal battery, and a polygonal battery such as a hexagonal battery. There is no special limitation in the embodiments of the present disclosure.

[0106] The battery cells 10 in some embodiments of the present disclosure are described in detail below.

[0107] In some embodiments, referring to FIG. 5 , the electrode assembly 12 includes a tab 121 and a pole piece 122 . The tab 121 is located at an edge of the pole piece 122 facing the inner wall of the installation cavity 10 a , and the tab 121 extends into the avoidance groove 13 b .

[0108] The electrode sheets 122 include a positive electrode sheet 122, a negative electrode sheet 122, and a separator. The positive electrode sheet 122 can be formed by applying a lithium-ion slurry onto an aluminum-platinum sheet, while the negative electrode sheet 122 can be formed by applying a graphite slurry onto a copper-platinum sheet. The positive and negative electrode sheets 122 are separated by a separator and then formed into the desired shape by winding or laminating.

[0109] The specific type of the pole piece 122 is not limited, and can be a wound type or a laminated type.

[0110] There are at least two tabs 121 , one electrically connected to the positive electrode sheet 122 and the other electrically connected to the negative electrode sheet 122 . The tabs 121 are conductive and are used to lead the current generated by the tabs 122 to meet the charging and discharging requirements of the battery cell 10 .

[0111] At least part of the pole ear 121 extends into the avoidance groove 13b, which is conducive to making the spatial shape within the installation cavity 10a adapt to the outer contour shape of the pole piece 122, which is conducive to reducing the spatial volume of the installation cavity 10a to reduce the overall size of the battery cell 10, and is conducive to avoiding extrusion between the inner wall of the avoidance groove 13b and the pole piece 122, so that the battery cell 10 can be charged and discharged normally.

[0112] It can be understood that, referring to FIG. 5 , there is a gap between the inner wall of the avoidance groove 13 b and the tab 121 in at least a portion of the area.

[0113] It is understandable that there is a gap between the inner wall of the mounting cavity 10 a and the pole piece 122 to avoid squeezing between the inner wall of the mounting cavity 10 a and the pole piece 122 .

[0114] It can be understood that the arrangement of the avoidance area 13 a is adapted to the tab 121 .

[0115] For example, referring to FIG. 3 and FIG. 5 , there are two tabs 121 with opposite polarities, there are two avoidance regions 13 a , and the two tabs 121 are respectively located in the avoidance groove 13 b of one avoidance region 13 a .

[0116] That is, the spaces between the two tabs 121 are separated from each other, thereby reducing the probability of contact between the two tabs 121 and causing a short circuit, and effectively improving the safety of the battery cell 10.

[0117] The two avoidance areas 13a may be arranged symmetrically.

[0118] For another example, referring to FIG6 , FIG7 and FIG8 , there is one avoidance area 13 a , and two tabs 121 are located in the avoidance groove 13 b of the avoidance area 13 a and are spaced apart.

[0119] In other words, the two tabs 121 are located within the same escape groove 13b. This, on the one hand, only requires the protrusion 132 and the escape groove 13b to be manufactured on the first wall 11b, corresponding to the escape area 13a, thereby reducing production costs. On the other hand, during assembly of the battery cell 10, the two tabs 121 can be simultaneously inserted into the escape groove 13b, thus simplifying the installation process.

[0120] The two tabs 121 are spaced apart to reduce the risk of short circuit caused by contact between the two tabs 121 .

[0121] It is understandable that the protrusions 132 protrude from the outer surface of the battery cell 10 , and therefore, the arrangement of the protrusions 132 will affect the arrangement of other components in the battery except the battery cell 10 .

[0122] For example, in some embodiments, referring to FIG. 9 , there are two avoidance regions 13 a , and the two avoidance regions 13 a are respectively located at one end of the battery cell 10 along the length direction of the battery cell 10 .

[0123] The length direction of the battery cell 10 refers to the direction in which the largest dimension of the three-dimensional dimensions of the outer contour of the battery cell 10 extends when the outer contour of the battery cell 10 is a square.

[0124] In this way, the distance between the two avoidance areas 13a is increased as much as possible, which is conducive to forming a larger flat area on the first wall 11b between the two avoidance areas 13a. Further, when the internal volume of the battery is constant, other components with larger outer contour dimensions in the battery are conveniently arranged in this area, providing convenience for the arrangement of other components in the battery. At the same time, it is conducive to reducing the volume of the battery, improving the space utilization inside the battery, and making the volume of the battery more compact.

[0125] For another example, in some embodiments, referring to FIG. 10 , there is one avoidance region 13 a , and the distance between the avoidance region 13 a and one end of the battery cell 10 in the longitudinal direction is greater than the distance between the avoidance region 13 a and the other end of the battery cell 10 in the longitudinal direction.

[0126] That is, the first wall 11b is divided into two areas along its length by the avoidance area 13a, one of which is larger than the other. This allows, given a given battery volume, for larger components to be placed in the larger area, facilitating the placement of other components. This also helps reduce the battery's volume, improves internal space utilization, and makes the battery more compact.

[0127] In some embodiments where there is only one avoidance region 13a, referring to FIG10 , the avoidance region 13a is located at one end in the longitudinal direction of the battery cell 10. This maximizes the area of ​​the first wall 11b located at the other end in the longitudinal direction of the battery cell 10, thereby facilitating the placement of other battery components with larger outer dimensions in this region. This facilitates the placement of other battery components and helps reduce the battery's volume, improving internal space utilization and making the battery more compact.

[0128] The specific shapes of the protrusion 132 and the avoidance groove 13b are not limited, such as round, square, etc.

[0129] It is understandable that the protrusion 132 has the same shape as the avoidance groove 13b and is adapted to the shape of the tab 121 to improve the space utilization within the avoidance groove 13b and reduce the volume of the protrusion 132 to reduce the adverse effect of the protrusion 132 on the space utilization within the battery.

[0130] The specific structure of the housing 11 is not limited.

[0131] For example, referring to Figures 3 to 8 and Figures 13 to 16, the shell 11 includes a casing 14 and a cover assembly 13, one side of the casing 14 is open to form an opening 11a, the cover assembly 13 includes a cover body 131 and an explosion-proof valve 133, the cover body 131 is covered on the opening 11a to jointly form an installation cavity 10a, the first wall 11b is located on the cover body 131, and the explosion-proof valve 133 is provided on the cover body 131.

[0132] The cover plate assembly 13 covers the opening 11a and is sealed to the enclosure 14 to encapsulate the electrode assembly 12 and the electrolyte in the mounting cavity 10a, thereby preventing the electrolyte from overflowing or preventing foreign matter from entering the mounting cavity 10a and contaminating the electrolyte, so that the electrochemical reaction of the battery cell 10 during the charging and discharging process proceeds normally.

[0133] The specific method of sealing the cover plate assembly 13 and the housing shell 14 is not limited, for example, welding.

[0134] The cover body 131 is used to improve the installation position of other components in the cover assembly 13 , and at the same time, a sealed connection is achieved between the cover body 131 and the surrounding shell 14 .

[0135] The explosion-proof valve 133 is used to trigger the pressure inside the battery cell 10 to open after thermal runaway occurs inside the battery cell 10, so that the gas and / or liquid in the battery cell 10 can be discharged from the battery cell 10 under pressure, thereby reducing the probability of explosion of the battery cell 10.

[0136] In this way, by setting the avoidance area 13a on the cover assembly 13, it is beneficial to allow a part of the electrode assembly 12 to directly enter or escape from the avoidance groove 13b during the installation and removal of the cover assembly 13, thereby improving the installation and removal efficiency of the battery cell 10. At the same time, it is convenient to install the explosion-proof valve 133 synchronously with the assembly of the cover assembly 13, thereby improving the assembly efficiency of the battery cell 10.

[0137] It can be understood that the opening direction of the avoidance groove 13 b is the same as the covering direction of the cover assembly 13 .

[0138] In some embodiments, referring to FIG. 13 , the explosion-proof valve 133 is disposed on a protrusion 132 . The protrusion 132 is located at one end of the cover body 131 along the length direction of the battery cell 10 .

[0139] This helps improve the space utilization rate within the avoidance groove 13b, reduces the redundant volume within the installation cavity 10a, and makes the space within the battery cell 10 more compact, thereby reducing the total volume and external dimensions of the battery cell 10. This, in turn, helps increase the number of battery cells 10 that can be accommodated in the battery, thereby improving the battery's energy density and space utilization rate. Furthermore, the area of ​​the outer surface of the cover body 131 at the other end of the battery cell 10 in the longitudinal direction can be increased, making it easier to arrange other components with larger external dimensions in this area, thus providing convenience for the arrangement of other components in the battery.

[0140] In some embodiments, referring to FIG14 , explosion-proof valve 133 is located on cover body 131. Explosion-proof valve 133 and protrusion 132 are located at one end of cover body 131 along the length of battery cell 10. Explosion-proof valve 133 is located on cover body 131 except for avoidance area 13a.

[0141] This helps to minimize the volume of the protrusion 132 .

[0142] In some embodiments, the electrode assembly 12 includes a pole ear 121 and a pole piece 122. The pole ear 121 is arranged at the edge of one end of the pole piece 122 facing the cover body 131, and the pole ear 121 is located at one end of the pole piece 122 along the length direction of the battery cell 10, so that the pole ear 121 extends into the avoidance groove 13b.

[0143] In this way, the arrangement of the tabs 121 is adapted to the arrangement of the protrusions 132 , thereby facilitating improved space utilization within the mounting cavity 10 a .

[0144] The specific method for manufacturing the protrusion 132 is not limited. For example, the cover body 131 is a metal plate, and the protrusion 132 is formed by stamping.

[0145] It can be understood that a mounting hole is provided on the cover plate assembly 13 to connect the mounting cavity 10a with the outside, and the explosion-proof valve 133 is provided in the mounting hole and sealed with the inner wall of the mounting hole.

[0146] In some embodiments, referring to FIG. 3 to FIG. 10 , the cap assembly 13 includes a post 134 . The post 134 is disposed on the protrusion 132 and is electrically connected to the electrode assembly 12 .

[0147] The terminal post 134 is the portion of the cover plate assembly 13 that is electrically connected to the tab 121 of the electrode assembly 12. There are at least two terminals 134, each of which is divided into two portions with opposite polarities. One portion is electrically connected to the portion of the electrode assembly 12 with positive polarity, thereby serving as the positive electrode of the battery cell 10, and the other portion is electrically connected to the portion of the electrode assembly 12 with negative polarity, thereby serving as the negative electrode of the battery cell 10.

[0148] It is understandable that a through hole is provided on the protrusion 132 , and the pole 134 is passed through the through hole to be electrically connected to the electrode assembly 12 , so that a portion of the pole 134 is located in the avoidance groove 13 b.

[0149] In this way, the space utilization rate within the avoidance groove 13b is further improved, which is beneficial to reducing the redundant volume within the installation cavity 10a, making the space within the battery cell 10 more compact, thereby helping to reduce the total volume and outer contour dimensions of the battery cell 10, and further helping to increase the number of battery cells 10 that can be accommodated in the battery, thereby improving the energy density and space utilization rate of the battery.

[0150] In some embodiments, referring to FIG13 , the pole 134 and the explosion-proof valve 133 are located on the same protrusion 132 and between the two poles 134. This effectively utilizes the space between the two poles 134, further improving the space utilization within the avoidance groove 13b and making the structure of the battery cell 10 more compact.

[0151] It is understandable that the specific position of the protrusion 132 on the first wall 11b is not limited.

[0152] In some embodiments, the first center plane 131 a of the battery cell 10 along its length coincides with the third center plane 132 a of the protrusion 132 along the length of the battery cell 10 .

[0153] The first center plane 131 a refers to a reference plane that is perpendicular to the length direction of the battery cell 10 and is located at a half-size position of the battery cell 10 along the length direction.

[0154] The third center plane 132 a is a reference plane perpendicular to the length direction of the battery cell 10 and located at a half-size of the protrusion 132 along the length direction.

[0155] This helps to make the structure of the battery cell 10 symmetrical about the first center plane 131 a, and facilitates adjustment of the placement direction of multiple battery cells 10 when they are arranged in a battery module, thereby improving the adaptability of the battery cells 10 .

[0156] In some embodiments, referring to FIG. 11 , the spacing between the first center plane 131 a of the battery cell 10 along its length and the third center plane 132 a of the protrusion 132 along the length of the battery cell 10 is a first spacing, and the ratio of the second spacing to the length dimension of the battery cell 10 is greater than 0 and does not exceed 47.5%.

[0157] The length of the battery cell 10 is L1 in FIG11 , and the first spacing is L3 in FIG11 . In other words, 0< L3 / L1≤47.5%.

[0158] This helps to form a large flat area on the first wall 11b along the length direction of the battery cell 10, making it easier to arrange other components with larger outer dimensions in the battery in this area, thereby facilitating the arrangement of other components in the battery.

[0159] The specific value of the ratio of the first spacing to the length of the battery cell 10 is not limited, for example, 0.5%, 6%, 10%, 15%, 20%, 25%, 30%, 47.5%, etc.

[0160] The specific method of measuring the length of the battery cell 10 is not limited. For example, the dimension between the end faces of the battery cell 10 along the length direction can be measured using a vernier caliper or a ruler.

[0161] The specific method for measuring the length of the protrusion 132 is not limited. For example, the dimension between the end surfaces of the protrusion 132 along the length direction can be measured using a vernier caliper or a ruler.

[0162] The specific method of measuring the first spacing is not limited. For example, the dimensions between the two ends of the battery cell 10 along the length direction and the dimensions between the two ends of the protrusion 132 along the length direction are measured respectively using a vernier caliper or a ruler, and the positions of the first center plane 131a and the second center plane 131b are calculated. Marks are made on the first center plane 131a and the second center plane 131b respectively, and the battery cell 10 is placed on a projector. The projected images of the two marks are aligned with the scale of the projector to obtain the size of the first spacing.

[0163] In some embodiments, the ratio of the first spacing to the length of the battery cell 10 is greater than 0 and does not exceed 5%;

[0164] Alternatively, the ratio of the first interval to the length of the battery cell 10 ranges from 40% to 47.5%.

[0165] This further facilitates forming a relatively large flat area on both sides or one side of the protrusion 132 along the length direction of the battery cell 10, making it easier for other components in the battery with relatively large outer dimensions to be arranged in this area.

[0166] The specific value of the ratio of the first spacing to the length of the battery cell 10 is not limited, for example, 1%, 2%, 3%, 4%, 5%, etc.; for example, 40%, 42.5%, 45%, 47.5%, etc.

[0167] In some embodiments, the second center plane 131 b of the battery cell 10 along the width direction thereof coincides with the fourth center plane 132 b of the protrusion 132 along the width direction of the battery cell.

[0168] The width direction of the battery cell 10 refers to a direction perpendicular to the length direction of the battery cell 10 on the plane of the first wall 11 b in the three-dimensional dimensions of the outer contour of the battery cell 10 when the outer contour of the battery cell 10 is a square.

[0169] The second center plane 131 b refers to a reference plane that is perpendicular to the width direction of the battery cell 10 and is located at a half-dimension of the battery cell 10 along the width direction.

[0170] The fourth center plane 132 b refers to a reference plane that is perpendicular to the width direction of the battery cell 10 and is located at a half-dimension of the protrusion 132 along the width direction.

[0171] This further facilitates forming a relatively large flat area of ​​the first wall 11 b along the width direction of the battery cell 10 , making it easier for other components of the battery with relatively large outer dimensions to be arranged in this area.

[0172] In some embodiments, referring to FIG. 11 , the spacing between the second center plane 131 b of the battery cell 10 along its width direction and the fourth center plane 132 b of the protrusion 132 along the width direction of the battery cell 10 is a second spacing, and the ratio of the second spacing to the width dimension of the battery cell 10 is greater than 0 and does not exceed 25%.

[0173] The width of the battery cell 10 is L2 in FIG11 , and the second spacing is L4 in FIG11 . In other words, 0< L4 / L2≤25%.

[0174] In this way, the dimension of the avoidance groove 13b in the width direction can accommodate a portion of the electrode assembly 12 while leaving a certain redundancy, so as to facilitate the electrode assembly 12 to extend into or out of the avoidance groove 13b.

[0175] The specific value of the ratio of the second spacing to the width of the battery cell 10 is not limited, for example, 0.5%, 10%, 15%, 20%, 25%, etc.

[0176] The specific method of measuring the width dimension of the battery cell 10 is not limited. For example, the dimension between the end surfaces of the battery cell 10 along the width direction can be measured using a vernier caliper or a ruler.

[0177] There is no limitation on the specific method for measuring the width of the protrusion 132 . For example, the dimension between the end surfaces of the protrusion 132 along the width direction can be measured using a vernier caliper or a ruler.

[0178] The specific method of measuring the second spacing is not limited. For example, the dimensions between the two ends of the battery cell 10 along the width direction and the dimensions between the two ends of the protrusion 132 along the width direction are measured respectively by a vernier caliper or a ruler, and the positions of the third center plane 132a and the fourth center plane 132b are calculated. The third center plane 132a and the fourth center plane 132b are marked respectively, and the battery cell 10 is placed on a projector, and the projection images of the two marks are aligned with the scale of the projector to obtain the size of the second spacing.

[0179] In some embodiments, the ratio of the second distance to the width of the battery cell 10 is greater than 0 and does not exceed 5%, that is, 0< L4 / L2 ≤ 5%.

[0180] In this way, it is more conducive to better ensure that the dimension of the avoidance groove 13b in the width direction accommodates a portion of the electrode assembly 12 and leaves redundancy.

[0181] The specific value of the ratio of the second spacing to the width of the battery cell 10 is not limited, for example, 1%, 2%, 3%, 4%, 5%, etc.

[0182] In some embodiments, referring to FIG11 , the ratio of the length of the protrusion 132 along the length direction of the battery cell 10 to the length of the battery cell 10 is not less than 5% and less than 100%. In other words, 5%≤L5 / L1<100%.

[0183] In this way, the space in the avoidance groove 13 b can be used to accommodate part of the electrode assembly 12 .

[0184] The specific value of the ratio of the dimension of the protrusion 132 along the length direction of the battery cell 10 to the length dimension of the battery cell 10 is not limited, for example, 5%, 10%, 25%, 50%, 75%, 99.9%, etc.

[0185] In some embodiments, the ratio of the dimension of the protrusion 132 along the length direction of the battery cell 10 to the length dimension of the battery cell 10 ranges from 5% to 37.5%.

[0186] In this way, it is more conducive to ensuring that the space in the avoidance groove 13 b meets the requirement of accommodating the electrode assembly 12 .

[0187] The specific value of the ratio of the dimension of the protrusion 132 along the length direction of the battery cell 10 to the length dimension of the battery cell 10 is not limited, for example, 5%, 10%, 10%, 15%, 20%, 25%, 30%, 35%, 37.5%, etc.

[0188] In some embodiments, referring to FIG11 , the ratio of the dimension of the protrusion 132 along the width direction of the battery cell 10 to the width dimension of the battery cell 10 is not less than 30% and less than 100%. In other words, 30%≤L6 / L2<100%.

[0189] In this way, the space in the avoidance groove 13 b can be used to accommodate part of the electrode assembly 12 .

[0190] The specific value of the ratio of the dimension of the protrusion 132 along the width direction of the battery cell 10 to the width dimension of the battery cell 10 is not limited, for example, 30%, 35%, 65%, 75%, 80%, 90%, 99.9%, etc.

[0191] In some embodiments, a ratio of a dimension of the protrusion 132 along the width direction of the battery cell 10 to the width dimension of the battery cell 10 ranges from 40% to 70%.

[0192] In this way, it is more conducive to ensuring that the space in the avoidance groove 13 b meets the requirement of accommodating the electrode assembly 12 .

[0193] The specific value of the ratio of the dimension of the protrusion 132 along the width direction of the battery cell 10 to the width dimension of the battery cell 10 is not limited, for example, 40%, 50%, 60%, 70%, etc.

[0194] In some embodiments, referring to FIG12 , the ratio of the height of the protrusion 132 to the total height of the battery cell 10 is no greater than 35%, that is, L8 / L7≤35%.

[0195] The height of the protrusion 132 refers to the dimension of the protrusion 132 along the height direction of the battery cell 10 .

[0196] The height direction of the battery cell 10 refers to a direction in which the protrusion 132 protrudes from the first wall 11 b in the three-dimensional dimensions of the outer contour of the battery cell 10 when the outer contour of the battery cell 10 is a square.

[0197] In this way, the space in the avoidance groove 13b is conducive to meeting the requirement of accommodating a part of the electrode assembly 12 in the height direction, while reducing the problem of the height of the protrusion 132 being too high and being unfavorable for the arrangement of other components in the battery. At the same time, it is conducive to reducing the size of the tab 121.

[0198] The specific method of measuring the height of the battery cell 10 is not limited. For example, the dimension between the end surfaces at both ends of the battery cell 10 along the height direction can be measured using a vernier caliper or a ruler.

[0199] The specific method of measuring the height of the protrusion 132 is not limited. For example, the dimension between the end surfaces of the protrusion 132 at both ends along the height direction can be measured using a vernier caliper or a ruler.

[0200] The specific value of the ratio of the height of the protrusion 132 to the total height of the battery cell 10 is not limited, for example, 5%, 10%, 15%, 20%, 25%, 30%, 35%, etc.

[0201] 11 , in some embodiments, the ratio of the height of the protrusion 132 to the total height of the battery cell 10 is in a range of 2.5% to 20%, that is, 2.5%≤L8 / L7≤20%.

[0202] In this way, the problem of the protrusion 132 being too high and thus hindering the arrangement of other components in the battery is further reduced.

[0203] In some embodiments, referring to FIG. 15 and FIG. 16 , the battery cell 10 includes an explosion-proof valve 133 , which is disposed on the housing 11 .

[0204] That is, a mounting hole is formed on the housing 11 and passes through the housing 11 in a thickness direction thereof, and the explosion-proof valve 133 is disposed in the mounting hole and sealed with an inner wall of the mounting hole.

[0205] In this way, the advantage of having a larger layout space on the shell 11 can be utilized. On the one hand, it is conducive to arranging an explosion-proof valve 133 with a larger opening flow, thereby further reducing the probability of explosion of the battery cell 10; on the other hand, it is conducive to making the ejection direction of the high-temperature airflow after the explosion-proof valve 133 is opened consistent with the arrangement of each battery cell 10 in the battery, thereby improving the safety of battery use.

[0206] The specific position of the explosion-proof valve 133 on the housing 11 is not limited.

[0207] For example, referring to Figure 15 , explosion-proof valve 133 is located on the side of the housing 11 facing away from protrusion 132. In other words, the high-temperature airflow ejected from explosion-proof valve 133 is directed away from the protrusion. This helps keep the high-temperature airflow away from other battery components electrically connected to protrusion 132, thereby reducing the impact of the high-temperature airflow on other battery cells 10 and other components, lowering the chance of a chain reaction caused by thermal runaway in the battery, and improving battery safety.

[0208] For another example, referring to FIG. 16 , the battery cell 10 is a cubic structure, and the explosion-proof valve 133 is located on the wall of the housing 11 adjacent to the first wall 11 b .

[0209] In this way, the high-temperature airflow ejected from the explosion-proof valve 133 is directed away from other components in the battery that are electrically connected to the protrusion 132, thereby reducing the impact of the high-temperature airflow on other battery cells 10 and other components, reducing the probability of a chain reaction due to thermal runaway in the battery, and improving the safety of the battery.

[0210] The following is a brief introduction to eight specific embodiments with reference to the accompanying drawings.

[0211] First embodiment

[0212] 3 to 5 , the outer contour of the battery cell 10 is a square. The number of the avoidance areas 13 a is two. The two tabs 121 are respectively located in the avoidance groove 13 b of one avoidance area 13 a , and the two poles 134 are respectively located on one protrusion 132 .

[0213] Second embodiment

[0214] Referring to Figures 6 to 8, the outer contour of the battery cell 10 is square, the number of the avoidance area 13a is one, the two tabs 121 are located in the avoidance groove 13b of the avoidance area 13a and are arranged at intervals, the two poles 134 are both located on the protrusion 132 corresponding to the avoidance area 13a, and the first center plane 131a of the battery cell 10 along its longitudinal direction coincides with the third center plane 132a of the protrusion 132 along the longitudinal direction of the battery cell 10.

[0215] Third embodiment

[0216] 9 , the outer contour of the battery cell 10 is a square, and the number of the avoidance areas 13 a is two. The two avoidance areas 13 a are respectively located at one end of the battery cell 10 along the length direction of the battery cell 10 , and the two tabs 121 are respectively located in the avoidance groove 13 b of one avoidance area 13 a , and the two pole posts 134 are respectively located on one protrusion 132 .

[0217] Fourth embodiment

[0218] 10 , the outer contour of the battery cell 10 is a square. The number of the avoidance area 13a is one, and the avoidance area 13a is located at one end of the battery cell 10 along the length direction of the battery cell 10 . Both poles 134 are located on the protrusions 132 corresponding to the avoidance area 13a .

[0219] Fifth embodiment

[0220] 13 , there is one avoidance area 13 a . An explosion-proof valve 133 and two poles 134 are located on the protrusion 132 , and the explosion-proof valve 133 is located between the two poles 134 .

[0221] Sixth embodiment

[0222] 14 , there is one avoidance area 13 a , the pole 134 is located on the protrusion 132 , and the explosion-proof valve 133 is located on the cover body 131 and spaced apart from the protrusion 132 .

[0223] Seventh embodiment

[0224] 15 , there is only one avoidance area 13 a , and the explosion-proof valve 133 is located on a side of the housing 11 away from the cover assembly 13 .

[0225] Eighth embodiment

[0226] 16 , there is one avoidance area 13 a , the battery cell 10 is a cubic structure, and the explosion-proof valve 133 is located on a wall surface of the housing 11 adjacent to the first wall 11 b .

[0227] The length of the battery cell 10 ranges from 400 mm (millimeter) to 1500 mm, and the specific length may be any value, such as 400 mm, 500 mm, 600 mm, 700 mm, 800 mm, 900 mm, 1000 mm, 1200 mm, 1500 mm, etc.

[0228] The width of the battery cell 10 ranges from 10 mm to 60 mm, and the specific value is not limited, for example, 10 mm, 20 mm, 30 mm, 35 mm, 40 mm, 50 mm, 60 mm, etc.

[0229] The height of the battery cell 10 ranges from 50 mm to 250 mm, and the specific value is not limited, for example, 50 mm, 60 mm, 70 mm, 80 mm, 100 mm, 120 mm, 150 mm, 180 mm, 200 mm, 220 mm, 250 mm, etc.

[0230] The height of the protrusion 132 ranges from 5 mm to 10 mm, and the specific value is not limited, for example, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0231] The embodiment of the present disclosure also provides a cover assembly 13 for the battery cell 10. Referring to Figures 3 to 8, the cover assembly 13 includes a cover body 131. The cover body 131 is provided with an avoidance area 13a. The avoidance area 13a is recessed on one side along the thickness direction to form an avoidance groove 13b, and protrudes on the other side to form a protrusion 132.

[0232] The space within the avoidance groove 13b is used to accommodate at least a portion of the components within the battery cell 10, such as a portion of the electrode assembly 12, thereby making the space within the battery cell 10 more compact and reducing the total volume and outer dimensions of the battery cell 10.

[0233] In some embodiments, referring to FIG. 9 , there are two avoidance regions 13 a , and the two avoidance regions 13 a are respectively located at one end of the cover body 131 along the length direction of the cover body 131 .

[0234] In this way, it is beneficial to form a relatively large flat area on the outer surface of the cover assembly 13 between the two avoidance areas 13a, so that other components in the battery can be arranged in this area.

[0235] In some embodiments, the length direction of the cover body 131 is the length direction of the battery cell 10 .

[0236] In some embodiments, referring to FIG. 10 , there is one avoidance region 13 a , and the avoidance region 13 a is located at one end of the cover body 131 along the length direction of the cover body 131 .

[0237] In this way, the area of ​​the outer surface of the cover assembly 13 located at the other end of the length direction of the cover body 131 can be maximized, thereby facilitating the arrangement of other components in the battery with larger outer contour dimensions in this area, providing convenience for the arrangement of other components in the battery.

[0238] In some embodiments, referring to Figure 13, the cover assembly 13 includes an explosion-proof valve 133, which is disposed on the protrusion 132. This helps improve the space utilization rate of the space in the avoidance groove 13b and makes the structure of the cover assembly 13 more compact.

[0239] In some embodiments, referring to FIG14 , the explosion-proof valve 133 is located on the cover body 131 and is spaced apart from the protrusion 132 , thereby minimizing the volume of the protrusion 132 .

[0240] In some embodiments, referring to FIG. 3 , the cover assembly 13 includes a pole 134 . The pole 134 is disposed on the protrusion 132 , which is beneficial for improving the space utilization rate within the avoidance groove 13 b.

[0241] An embodiment of the present disclosure further provides a battery, which includes a plurality of battery cells 10 according to any one of the aforementioned embodiments.

[0242] In this way, by adopting the battery cells 10 in the aforementioned embodiment, the number of battery cells 10 that can be accommodated in the battery can be effectively increased, thereby improving the energy density and space utilization of the battery.

[0243] An embodiment of the present disclosure further provides an electrical device, which includes the battery in the aforementioned embodiment, and the battery serves as a power source for the electrical device.

[0244] In this way, by adopting the battery in the aforementioned embodiment, the power consumption endurance of the electrical device can be effectively improved.

[0245] The various embodiments / implementations provided in the present disclosure can be combined with each other without causing any contradiction.

[0246] The foregoing description is merely a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure are intended to be within the scope of protection of the present disclosure. Industrial Applicability

[0247] The battery cell in the embodiment of the present disclosure forms an avoidance groove on the shell for accommodating a part of the electrode assembly, and a protrusion corresponding to the accommodating groove. This helps to reduce the redundant volume in the installation cavity while ensuring that the volume of the installation cavity meets the requirements for placing the electrode assembly, making the space in the battery cell more compact, thereby helping to reduce the total volume and outer contour dimensions of the battery cell, and further helping to increase the number of battery cells that can be accommodated in the battery, thereby improving the energy density and space utilization of the battery.

Claims

1. A battery cell, comprising: A housing having a mounting cavity; An electrode assembly, disposed in the mounting cavity; An escape area is provided on the first wall of the shell. The escape area is recessed on one side toward the electrode assembly to form an escape groove, and protrudes on the side away from the electrode assembly to form a protrusion. A portion of the electrode assembly extends into the escape groove.

2. The battery cell according to claim 1, wherein: The electrode assembly comprises a pole ear and a pole piece, wherein the pole ear is located at an edge of one end of the pole piece facing the inner wall of the installation cavity, and the pole ear extends into the avoidance groove.

3. The battery cell according to claim 2, wherein: The number of the pole lugs is two and the polarities are opposite, the number of the avoidance areas is two, and the two pole lugs are respectively located in the avoidance groove of one avoidance area; Alternatively, the number of the avoidance area is one, and the two pole tabs are located in the avoidance groove of the avoidance area and are arranged at intervals.

4. The battery cell according to any one of claims 1 to 3, wherein: The number of the avoidance regions is two, and the two avoidance regions are respectively located at one end of the battery cell along the length direction of the battery cell.

5. The battery cell according to any one of claims 1 to 4, wherein: The number of the avoidance region is one, and the distance between the avoidance region and one end of the battery cell in the length direction is greater than the distance between the avoidance region and the other end of the battery cell in the length direction.

6. The battery cell according to claim 5, wherein: The avoidance area is located at one end of the battery cell along the length direction of the battery cell.

7. The battery cell according to claim 5 or 6, wherein: The shell includes a surrounding shell and a cover assembly, one side of the surrounding shell is opened to form an opening, the cover assembly includes a cover body and an explosion-proof valve, the cover body is covered on the opening to jointly form the installation cavity, the first wall is located on the cover body, and the explosion-proof valve is arranged on the cover body.

8. The battery cell according to claim 7, wherein: The explosion-proof valve is arranged on the protrusion, and the protrusion is located at one end of the cover plate body along the length direction of the battery cell.

9. The battery cell according to claim 7 or 8, wherein: The explosion-proof valve is located on the cover plate body, and the explosion-proof valve and the protrusion are respectively located at one end of the cover plate body along the length direction of the battery cell.

10. The battery cell according to claim 8 or 9, wherein: The electrode assembly includes a pole ear and a pole piece, wherein the pole ear is arranged at an edge of the pole piece facing one end of the cover body, and the pole ear is located at one end of the pole piece along the length direction of the battery cell so that the pole ear extends into the avoidance groove.

11. The battery cell according to any one of claims 7 to 10, wherein: The cap plate assembly includes a pole, which is disposed on the protrusion and electrically connected to the electrode assembly.

12. The battery cell according to claim 1, wherein: A first center plane of the battery cell along the length direction thereof coincides with a third center plane of the protrusion along the length direction of the battery cell.

13. The battery cell according to any one of claims 1 to 12, wherein: The distance between the first center plane of the battery cell along its length direction and the third center plane of the protrusion along the length direction of the battery cell is a first distance, and the ratio of the first distance to the length dimension of the battery cell is greater than 0 and does not exceed 47.5%.

14. The battery cell according to claim 13, wherein: The ratio of the first spacing to the length dimension of the battery cell is greater than 0 and does not exceed 5%; Alternatively, the ratio of the first spacing to the length dimension of the battery cell ranges from 40% to 47.5%.

15. The battery cell according to any one of claims 1 to 14, wherein: A second center plane of the battery cell along the width direction thereof coincides with a fourth center plane of the protrusion along the width direction of the battery cell.

16. The battery cell according to claim 1, wherein: The distance between the second center plane of the battery cell along its width direction and the fourth center plane of the protrusion along the width direction of the battery cell is a second distance, and the ratio of the second distance to the width dimension of the battery cell is greater than 0 and does not exceed 25%.

17. The battery cell according to claim 16, wherein: The ratio of the second interval to the width of the battery cell is greater than 0 and does not exceed 5%.

18. The battery cell according to any one of claims 1 to 17, wherein: The ratio of the dimension of the protrusion along the length direction of the battery cell to the length dimension of the battery cell is not less than 5% and less than 100%; And / or, a ratio of a dimension of the protrusion along a width direction of the battery cell to a width dimension of the battery cell is not less than 30% and less than 100%.

19. The battery cell according to any one of claims 1 to 18, wherein: The ratio of the height of the protrusion to the total height of the battery cell is no more than 35%.

20. The battery cell according to any one of claims 1 to 20, wherein: The battery cell includes an explosion-proof valve, and the explosion-proof valve is arranged on the shell.

21. The battery cell according to claim 20, wherein: The explosion-proof valve is located on a side of the housing away from the protrusion; Alternatively, the battery cell is a cubic structure, and the explosion-proof valve is located on a wall surface of the shell adjacent to the first wall.

22. A cover plate assembly for a battery cell, the cover plate assembly comprising a cover plate body, the cover plate body being provided with an escape area, the escape area being recessed on one side along the thickness direction to form an escape groove, and protruding on the other side to form a protrusion.

23. The cover plate assembly according to claim 22, wherein: The number of the avoidance areas is two, and the two avoidance areas are respectively located at one end of the cover plate body along the length direction of the cover plate body.

24. The cover plate assembly according to claim 22 or 23, wherein: The number of the avoidance area is one, and the avoidance area is located at one end of the cover plate body along the length direction of the cover plate body.

25. The cover plate assembly according to any one of claims 22 to 24, wherein: The cover plate assembly includes an explosion-proof valve, and the explosion-proof valve is arranged on the protrusion; And / or, the explosion-proof valve is located on the cover plate body and is spaced apart from the protrusion.

26. The cover plate assembly according to any one of claims 22 to 25, wherein: The cover plate assembly includes a pole, and the pole is arranged on the protrusion.

27. A battery comprising a plurality of the battery cells according to any one of claims 1 to 21.

28. An electrical device, comprising the battery according to claim 27, wherein the battery serves as a power source for the electrical device.

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