Battery monomer, cover plate assembly, battery and power utilization device

Abstract

The embodiment of the invention provides a battery monomer, a cover plate assembly, a battery and a power utilization device, the battery monomer comprises a shell and an electrode assembly, the shell is provided with a mounting cavity, and the electrode assembly is arranged in the mounting cavity; an avoiding area is arranged on the first wall of the shell, the side, facing the electrode assembly, of the avoiding area is sunken to form an avoiding groove, the side, deviating from the electrode assembly, of the avoiding area protrudes to form a protrusion, and a part of the electrode assembly extends into the avoiding groove. According to the battery monomer in the embodiment of the invention, the avoiding groove for accommodating one part of the electrode assembly is formed in the shell, so that the space in the battery monomer is more compact, the total volume and the outer contour size of the battery monomer are reduced, and the number of the battery monomers capable of being accommodated in the battery is increased; the energy density and the space utilization rate of the battery are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery cell, a cover plate assembly, a battery and an electrical device. Background Art

[0002] In recent years, batteries, as an important part of the new energy industry, have received more and more attention.

[0003] The battery is provided with a plurality of battery cells, and the plurality of battery cells are electrically connected in series or in parallel to achieve charging and discharging.

[0004] When the installation space of the battery is fixed, the number of battery cells loaded in the battery is closely related to the battery capacity. Summary of the invention

[0005] In view of this, embodiments of the present invention are intended to provide a battery cell, a cover plate assembly, a battery, and an electrical device for improving the space utilization rate within the battery and the energy density of the battery.

[0006] To achieve the above object, the technical solution of the embodiment of the present invention is implemented as follows:

[0007] An embodiment of the present invention provides a battery cell, the battery cell comprising:

[0008] A housing having a mounting cavity;

[0009] An electrode assembly, disposed in the mounting cavity;

[0010] 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.

[0011] The battery cell in the embodiment of the present invention, by forming an avoidance groove for accommodating a part of the electrode assembly and a protrusion corresponding to the accommodating groove on the shell, is conducive to reducing the redundant volume in the installation cavity while realizing that the volume of the installation cavity meets the requirements for placing the electrode assembly, so that the space in the battery cell is more compact, which is conducive to reducing the total volume and outer contour dimensions of the battery cell, and further helps 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.

[0012] In some embodiments, the electrode assembly includes a pole ear and a pole piece, the pole ear is located at the 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. This is conducive to making the spatial shape of the installation cavity adapt to the outer contour shape of the pole piece, which is conducive to reducing the spatial volume of the installation cavity to reduce the overall size of the battery cell, and is conducive to avoiding compression between the inner wall of the avoidance groove and the pole piece, so that the battery cell can be charged and discharged normally.

[0013] In some embodiments, the number of the pole ears is two and the polarities are opposite, the number of the avoidance areas is two, and the two pole ears are respectively located in the avoidance groove of one avoidance area, so that the probability of contact between the two pole ears and thus causing a short circuit is reduced, and the safety of the battery monomer is effectively improved;

[0014] 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. Thus, on the one hand, only a protrusion and avoidance groove corresponding to the avoidance area need to be manufactured on the cover plate assembly, thereby reducing production costs; on the other hand, when the cover plate assembly is covered on the opening, the two pole ears can enter the avoidance groove synchronously, thereby simplifying the installation steps.

[0015] In some embodiments, the number of the avoidance areas is two, and the two avoidance areas are respectively located at one end of the battery cell along the length direction of the battery cell. In this way, the distance between the two avoidance areas is increased as much as possible, which is conducive to forming a relatively large flat area on the outer surface of the cover assembly between the two avoidance areas, and then, when the internal volume of the battery is constant, it is convenient to arrange other components with larger outer contour dimensions in the battery in this area, which provides convenience for the arrangement of other components in the battery, and at the same time, it is conducive to reducing the volume of the battery, improving the space utilization rate inside the battery, and making the volume of the battery more compact.

[0016] In some embodiments, the number of the avoidance area is one, and the distance between the avoidance area and one end of the battery cell in the length direction is greater than the distance between the avoidance area and the other end of the battery cell in the length direction. In this way, when the internal volume of the battery is constant, other components with larger outer contour dimensions in the battery are conveniently arranged in a larger area, which provides convenience for the arrangement of other components in the battery, and at the same time, is conducive to reducing the volume of the battery, improving the space utilization rate inside the battery, and making the volume of the battery more compact.

[0017] In some embodiments, the avoidance area is located at one end of the battery cell along the length direction of the battery cell. In this way, the area of ​​the outer surface of the shell located at the other end of the length direction of the battery cell can be maximized, so that other components with larger outer contour dimensions in the battery can be arranged in this area, which provides convenience for the arrangement of other components in the battery, and at the same time, is conducive to reducing the volume of the battery, improving the space utilization rate inside the battery, and making the volume of the battery more compact.

[0018] In some embodiments, 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.

[0019] 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 helping to improve 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.

[0020] In some embodiments, the explosion-proof valve is disposed on the protrusion, and the protrusion is located at one end of the cover body along the length direction of the battery cell.

[0021] In this way, it is beneficial to improve the space utilization rate of the space in the avoidance groove, reduce the redundant volume in the installation cavity, make the space in the battery cell more compact, thereby reducing the total volume and outer contour size of the battery cell, and further increasing the number of battery cells that can be accommodated in the battery, improving the energy density and space utilization rate of the battery. In addition, the area of ​​the outer surface of the cover body located at the other end of the length direction of the battery cell can be made larger, so that other components with larger outer contour dimensions in the battery are arranged in this area, which provides convenience for the arrangement of other components in the battery.

[0022] 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, which is conducive to reducing the volume of the protrusion.

[0023] 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.

[0024] In this way, the arrangement of the tabs is adapted to the arrangement of the protrusions, thereby facilitating improvement of space utilization in the installation cavity.

[0025] In some embodiments, the cover plate assembly includes a pole, which is disposed on the protrusion and electrically connected to the electrode assembly. In this way, the space utilization rate in the avoidance groove is further improved, which is conducive to reducing the redundant volume in the installation cavity, making the space in the battery cell more compact, thereby facilitating the reduction of the total volume and outer contour size of the battery cell, and further facilitating the increase of the number of battery cells that can be accommodated in the battery, and improving the energy density and space utilization rate of the battery.

[0026] 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.

[0027] In this way, it is beneficial to make the structure of the battery cell symmetrical about the first center plane, and it is convenient to adjust the placement direction of multiple battery cells when they are arranged in the battery module, so as to improve the adaptability of the battery cells.

[0028] 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 larger flat area of ​​the first wall along the length direction of the battery cell, making it easier to arrange other components with larger outer contour dimensions in the battery in this area, thereby providing convenience for the arrangement of other components in the battery.

[0029] In some embodiments, the ratio of the first spacing to the length dimension of the battery cell is greater than 0 and does not exceed 5%;

[0030] Alternatively, the ratio of the first spacing to the length dimension of the battery cell ranges from 40% to 47.5%.

[0031] 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 contour dimensions to be arranged in this area.

[0032] 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, thereby facilitating the electrode assembly to extend into or out of the avoidance groove.

[0033] In some embodiments, a ratio of the second interval to the width of the battery cell is greater than 0 and does not exceed 5%.

[0034] In this way, it is more advantageous to make the dimension of the avoidance groove along the width direction accommodate a part of the electrode assembly and leave some redundancy.

[0035] 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%. In this way, on the one hand, it is conducive to making the space in the avoidance groove meet the requirement of accommodating a part 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 is conducive to keeping the position of the cover plate assembly stable during the assembly process;

[0036] 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.

[0037] 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 portion 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.

[0038] In some embodiments, the battery cell includes an explosion-proof valve, which is arranged on the housing. In this way, the advantage of having a large layout space on the housing can be utilized. On the one hand, it is conducive to arranging an explosion-proof valve with a large opening flow, thereby further reducing the probability of explosion of the battery cell; on the other hand, it is conducive to making the ejection direction of the high-temperature airflow after the explosion-proof valve is opened compatible with the arrangement of the battery cells in the battery, thereby improving the safety of battery use.

[0039] In some embodiments, the explosion-proof valve is located on a side of the housing away from the protrusion, so that the high-temperature airflow is ejected away from other components in the battery 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 of thermal runaway in the battery, and improving the safety of the battery;

[0040] Alternatively, the battery cell is of 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.

[0041] An embodiment of the present invention also provides a cover plate assembly for a battery cell, the cover plate assembly includes a cover plate body, an avoidance area is provided on the cover plate body, one side of the avoidance area along the thickness direction is recessed to form an avoidance groove, and the other side is convex to form a protrusion, thereby facilitating the space inside the battery cell to be more compact, thereby facilitating the reduction of the total volume and outer contour dimensions of the battery cell.

[0042] In some embodiments, 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. In this way, it is beneficial to form a relatively large flat area on the outer surface of the cover plate assembly between the two avoidance areas, so that other components in the battery can be arranged in this area. In this way, the area of ​​the outer surface of the cover plate assembly located at the other end of the length direction of the cover plate body can be maximized, so that other components with larger outer contour dimensions in the battery can be arranged in this area, which provides convenience for the arrangement of other components in the battery.

[0043] In some embodiments, the number of the avoidance area is one, and the avoidance area is located at one end of the cover body along the length direction of the cover body. In this way, the area of ​​the outer surface of the cover assembly located at the other end of the length direction of the cover body can be maximized, so that other components with larger outer contour dimensions in the battery can be arranged in this area, providing convenience for the arrangement of other components in the battery.

[0044] In some embodiments, the cover plate assembly includes an explosion-proof valve, and the explosion-proof valve is arranged on the protrusion, which is conducive to improving the space utilization rate of the space in the avoidance groove and making the structure of the cover plate assembly more compact;

[0045] And / or, the explosion-proof valve is located on the cover plate body and is spaced apart from the protrusion, which is helpful to reduce the volume of the protrusion.

[0046] In some embodiments, the cover plate assembly includes a pole, and the pole is disposed on the protrusion, which is beneficial to improving the space utilization in the avoidance groove.

[0047] An embodiment of the present invention further provides a battery, comprising a plurality of battery cells according to any one of the aforementioned embodiments.

[0048] 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.

[0049] An embodiment of the present invention further provides an electric device, which includes the battery in the above embodiment, and the battery serves as a power source for the electric device.

[0050] In this way, by adopting the battery in the aforementioned embodiment, the power consumption endurance of the power-consuming device can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is a schematic diagram of an electric device being a car in one embodiment of the present invention;

[0052] Figure 2 is a schematic diagram of a battery in one embodiment of the present invention;

[0053] Figure 3 A schematic diagram of a battery cell in a first embodiment of the present invention;

[0054] Figure 4 It is an exploded schematic diagram of the first embodiment of the present invention;

[0055] Figure 5 It is a partial cutaway schematic diagram of a first embodiment of the present invention;

[0056] Figure 6 is a schematic diagram of a battery cell in a second embodiment of the present invention;

[0057] Figure 7 A partial cutaway schematic diagram of a second embodiment of the present invention;

[0058] Figure 8 It is an exploded schematic diagram of a second embodiment of the present invention;

[0059] Fig. 9 is a schematic diagram of a battery cell in a third embodiment of the present invention;

[0060] Fig.10 is a schematic diagram of a battery cell in a fourth embodiment of the present invention;

[0061] Fig.11 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 invention;

[0062] Fig.12 A schematic diagram of the relationship between the protrusion and the total height of the battery cell in one embodiment of the present invention;

[0063] Fig.13is a schematic diagram of a battery cell in a fifth embodiment of the present invention;

[0064] Fig.14 is a schematic diagram of a battery cell in a sixth embodiment of the present invention;

[0065] Fig.15 is a schematic diagram of a battery cell in a seventh embodiment of the present invention;

[0066] Fig.16 FIG. 4 is a schematic diagram of a battery cell in an eighth embodiment of the present invention.

[0067] Description of Reference Numerals

[0068] Vehicle 1000; battery 100; bottom cover 101; top cover 102; controller 200; motor 300;

[0069] Battery cell 10; installation cavity 10a; shell 11; opening 11a; first wall 11b; electrode assembly 12; pole ear 121; pole piece 122; cover assembly 13; shell 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 134. DETAILED DESCRIPTION

[0070] It should be noted that, in the absence of conflict, the embodiments of the present invention and the technical features in the embodiments may be combined with each other, and the detailed descriptions in the specific implementation methods should be understood as explanations of the purpose of the present invention and should not be regarded as improper limitations on the present invention.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" in the specification and claims of the present invention and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0072] In the description of the embodiments of the present invention, the technical terms "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 number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0073] 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 invention. The appearance of the phrase in various places 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.

[0074] In the description of the embodiments of the present invention, 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 may 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.

[0075] In the description of the embodiments of the present invention, the technical term "length direction" refers to the position or location relationship based on the attached Figure 3 , Fig. 9 , Fig.10 and Fig.11 The orientation or positional relationship shown in the technical term "width direction" is based on the attached Figure 3 and Fig.11 The orientation or position relationship shown in the technical term "altitude direction" is based on the attached Figure 3 The orientation or positional relationship shown is only for the convenience of describing the embodiments of the present invention 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, and therefore should not be understood as a limitation on the embodiments of the present invention.

[0076] In the description of the embodiments of the present invention, 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0077] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact or contact through an intermediate medium layer. It can be contact with essentially no interaction force between the two contacting parties, or it can be contact with interaction force between the two contacting parties.

[0078] The following is a detailed description of the embodiments of the present invention.

[0079] At present, batteries are increasingly used in life and industry. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, and aerospace and other fields. With the continuous expansion of battery application areas, the market demand is also constantly expanding.

[0080] The battery cell is provided with an electrode assembly, and the outer contour of the electrode assembly is irregular. For example, the electrode assembly includes a pole ear and a pole piece, wherein the pole ear is provided on the pole piece and protrudes from the outer surface of the pole piece, so that the outer contour three-dimensional dimensions of the pole piece cannot represent the outer contour three-dimensional dimensions of the electrode assembly. The space in the battery cell for placing the electrode assembly is of a regular shape for the convenience of manufacturing. Therefore, in order to place the electrode assembly in the battery cell, the three-dimensional dimensions of the space in the battery cell for placing the electrode assembly will be significantly larger than the three-dimensional dimensions of the outer contour of the electrode assembly to form a certain redundant volume, resulting in an increase in the volume of the battery cell, while reducing the number of battery cells that can be arranged within a certain space volume range, resulting in low energy density and low space utilization of the battery.

[0081] An embodiment of the present invention aims to provide a 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 in the shell for accommodating an electrode assembly, so as to expand the volume of the space in the battery cell while allowing the protruding portion of the electrode assembly to enter the cavity in the protrusion, thereby reducing the three-dimensional size of the outer contour of the shell.

[0082] Specifically, the embodiment of the present invention provides a battery cell 10, referring to Figure 3 , Figure 4 and Figure 5 The battery cell 10 includes a housing 11 and an electrode assembly 12 .

[0083] 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 one side toward the electrode assembly 12 to form an 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.

[0084] The shell 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 shell 11 is used for filling the electrolyte.

[0085] The specific material of the housing 11 is not limited, and it can be steel, aluminum, composite metal materials, etc.

[0086] The electrode assembly 12 is provided with a positive electrode, a negative electrode and a separator. During the charge and discharge process of the battery cell 10, active ions (such as lithium ions) in the electrolyte are inserted and removed back and forth between the positive electrode and the negative electrode and an electrochemical reaction occurs. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting and allow the active ions to pass through.

[0087] The first wall 11 b refers to one of the outer surfaces of the housing 11 .

[0088] The avoidance area 13a forms an avoidance groove 13b on the side facing the electrode assembly 12, and the space in the avoidance groove 13b is used to accommodate a part 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 in the installation cavity 10a while allowing as much as possible of the electrode assembly 12 to extend into the avoidance groove 13b.

[0089] It can be understood that the protruding direction of the protrusion 132 is the same as the recessed direction of the avoidance groove 13 b.

[0090] The battery cell 10 in the embodiment of the present invention 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. While ensuring that the volume of the installation cavity 10a meets the requirements for accommodating the electrode assembly 12, it is beneficial to reduce the redundant volume in the installation cavity 10a, 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.

[0091] The battery cells in the embodiment of the present invention are combined in plurality to form a battery module or a battery.

[0092] The battery module can be used in, but is not limited to, electrical devices such as vehicles, ships or aircraft. The power supply system of the electrical device can be composed of the battery cells and batteries in the embodiments of the invention.

[0093] The battery can also be used in, but not limited to, energy storage power supply systems, vehicles, ships, aircraft and other electrical devices. The use of batteries can provide a higher total energy. Moreover, the battery is formed by placing a plurality of batteries in a sealed box, which has a more reliable dustproof and waterproof performance, and can therefore be used in scenarios where the use environment is more severe, humid, or even submerged in water.

[0094] The embodiment of the present invention provides an electric device including the above-mentioned battery module or battery for providing electric energy, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0095] In the following embodiments, for the convenience of description, an electric device according to an embodiment of the present invention is taken as an example of a vehicle 1000. The following is a description with reference to the accompanying drawings.

[0096] Figure 1 The structure diagram of a vehicle 1000 provided in one embodiment of the present invention is shown in FIG. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1 As shown, a battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and 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.

[0097] In some embodiments of the present invention, the battery 100 can be used 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.

[0098] Figure 2 The battery 100 is a three-dimensional exploded schematic diagram of an embodiment of the present invention. The battery 100 includes a bottom cover 101, a top cover 102 and at least one battery cell 10, and the top cover 102 is covered on the bottom cover 101, so as to form a receiving space for placing the battery cell 10 between the bottom cover 101 and the top cover 102.

[0099] In the battery 100, there can be multiple battery cells 10, and the multiple battery cells 10 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. The multiple battery cells 10 can 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 accommodation space formed by the bottom cover 101 and the top cover 102; of course, the battery 100 can also be a battery module formed by connecting multiple battery cells 10 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and are accommodated in the accommodation 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 confluence component for realizing electrical connection between the multiple battery cells 10.

[0100] In the embodiment of the present invention, 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.

[0101] The battery cell 10 may 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 hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiment of the present invention.

[0102] 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 prismatic battery, such as a hexagonal prismatic battery, etc. There is no special limitation in the embodiments of the present invention.

[0103] The battery cells 10 in some embodiments of the present invention are described in detail below.

[0104] In some embodiments, see Figure 5 The electrode assembly 12 includes a pole ear 121 and a pole piece 122 . The pole ear 121 is located at the edge of one end of the pole piece 122 facing the inner wall of the installation cavity 10 a , and the pole ear 121 extends into the avoidance groove 13 b .

[0105] The electrode sheet 122 includes a positive electrode sheet 122, a negative electrode sheet 122 and a separator. The positive electrode sheet 122 can be a slurry containing lithium ions applied on an aluminum platinum sheet, and the negative electrode sheet 122 can be a slurry mainly composed of graphite applied on a copper platinum sheet. The positive electrode sheet 122 and the negative electrode sheet 122 are separated by a separator and then formed into a desired shape by winding or laminating.

[0106] The specific type of the pole piece 122 is not limited, and it can be a winding type or a stacked type.

[0107] There are at least two tabs 121 , one of which is electrically connected to the positive electrode sheet 122 and the other is 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 .

[0108] At least part of the pole ear 121 extends into the avoidance groove 13b, which is beneficial to make the spatial shape within the installation cavity 10a adapt to the outer contour shape of the pole piece 122, which is beneficial to reducing the spatial volume of the installation cavity 10a to reduce the overall size of the battery cell 10, and is beneficial 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.

[0109] Understandably, see Figure 5 There is a gap between the inner wall of the avoidance groove 13 b and the pole ear 121 in at least a partial area.

[0110] 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 .

[0111] It can be understood that the arrangement of the avoidance area 13 a is adapted to the pole lug 121 .

[0112] For example, see Figure 3 and Figure 5 There are two pole tabs 121 with opposite polarities, two avoidance regions 13a, and the two pole tabs 121 are respectively located in the avoidance groove 13b of one avoidance region 13a.

[0113] That is to say, the spaces where the two tabs 121 are located are separated from each other, thus reducing the probability of the two tabs 121 contacting each other and causing a short circuit, thereby effectively improving the safety of the battery cell 10 .

[0114] The two avoidance areas 13a may be arranged symmetrically.

[0115] For example, see Figure 6 , Figure 7 and Figure 8 The number of the avoidance area 13 a is one, and the two pole ears 121 are located in the avoidance groove 13 b of the avoidance area 13 a and are arranged at intervals.

[0116] That is, the two tabs 121 are located in the same space of the avoidance groove 13b. Thus, on the one hand, only a protrusion 132 and an avoidance groove 13b corresponding to the avoidance area 13a need to be manufactured on the first wall 11b, thereby reducing the production cost; on the other hand, during the process of assembling the battery cell 10, the two tabs 121 can be simultaneously inserted into the avoidance groove 13b, thereby simplifying the installation steps.

[0117] The two tabs 121 are spaced apart to reduce the risk of short circuit caused by contact between the two tabs 121 .

[0118] It is understandable that the protrusions 132 protrude from the outer surface of the battery cell 10 , and therefore, the arrangement orientation of the protrusions 132 will affect the arrangement of other components in the battery except the battery cell 10 .

[0119] For example, in some embodiments, see Fig. 9 The number of the avoidance regions 13 a is two, 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 .

[0120] 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 in a square shape.

[0121] 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, it is convenient to arrange other components with larger outer contour dimensions in the battery in this area, which provides 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.

[0122] For example, in some embodiments, see Fig.10 The number of the avoidance region 13 a is one, and the distance between the avoidance region 13 a and one end of the battery cell 10 in the length direction is greater than the distance between the avoidance region 13 a and the other end of the battery cell 10 in the length direction.

[0123] That is to say, the first wall 11b is divided into two areas along the length direction by the avoidance area 13a, and the area of ​​one area is larger than the other area. In this way, when the internal volume of the battery is constant, other components with larger outer contour dimensions in the battery are conveniently arranged in the area with a larger area, which provides convenience for the arrangement of other components in the battery, and at the same time, is conducive to reducing the volume of the battery, improving the space utilization rate inside the battery, and making the volume of the battery more compact.

[0124] In some embodiments where the number of avoidance areas 13a is one, see Fig.10, the avoidance area 13a is located at one end of the length direction of the battery cell 10. In this way, the area of ​​the first wall 11b located at the other end of the length direction of the battery cell 10 can be maximized, so that other components with larger outer contour dimensions in the battery can be arranged in this area, which provides convenience for the arrangement of other components in the battery, and at the same time, is conducive to reducing the volume of the battery, improving the space utilization rate inside the battery, and making the volume of the battery more compact.

[0125] The specific shapes of the protrusion 132 and the avoidance groove 13b are not limited, such as round, square, etc.

[0126] It is understandable that the protrusion 132 has the same shape as the avoidance groove 13b and is adapted to the shape of the pole ear 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.

[0127] The specific structure of the housing 11 is not limited.

[0128] For example, see Figures 3 to 8 , Figures 13 to 16 The shell 11 includes a surrounding shell 14 and a cover assembly 13. One side of the surrounding shell 14 is opened 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 arranged on the cover body 131.

[0129] 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 installation cavity 10a to prevent the electrolyte from overflowing or foreign matter from entering the installation cavity 10a and contaminating the electrolyte, so that the electrochemical reaction of the battery cell 10 during the charging and discharging process proceeds normally.

[0130] The specific method of sealing the cover plate assembly 13 and the housing shell 14 is not limited, such as welding.

[0131] 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 .

[0132] The explosion-proof valve 133 is used to trigger the pressure in 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 to reduce the probability of explosion of the battery cell 10.

[0133] 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 helping to improve 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.

[0134] It can be understood that the opening direction of the avoidance groove 13 b is the same as the covering direction of the cover plate assembly 13 .

[0135] In some embodiments, see Fig.13 The explosion-proof valve 133 is disposed on the protrusion 132 , and the protrusion 132 is located at one end of the cover body 131 along the length direction of the battery cell 10 .

[0136] In this way, it is beneficial to improve the space utilization rate of the space in the avoidance groove 13b, and it is beneficial to reduce the redundant volume in the installation cavity 10a, so that the space in the battery cell 10 is more compact, thereby helping to reduce the total volume and outer contour size of the battery cell 10, and then it is beneficial to increase the number of battery cells 10 that can be accommodated in the battery, and improve the energy density and space utilization rate of the battery. In addition, the area of ​​the outer surface of the cover body 131 located at the other end of the length direction of the battery cell 10 can be made larger, so that other components with larger outer contour dimensions in the battery are arranged in this area, which provides convenience for the arrangement of other components in the battery.

[0137] In some embodiments, see Fig.14 The explosion-proof valve 133 is located on the cover body 131. The explosion-proof valve 133 and the protrusion 132 are respectively located at one end of the cover body 131 along the length direction of the battery cell 10. The explosion-proof valve 133 is provided on the cover body 131 except the avoidance area 13a.

[0138] This helps to minimize the volume of the protrusion 132.

[0139] 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.

[0140] In this way, the arrangement of the tabs 121 is adapted to the arrangement of the protrusions 132 , thereby facilitating the improvement of the space utilization rate in the installation cavity 10 a .

[0141] 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.

[0142] It can be understood that a mounting hole penetrating the mounting cavity 10a and the outside is provided on the cover plate assembly 13, and the explosion-proof valve 133 is provided in the mounting hole and sealed with the inner wall of the mounting hole.

[0143] In some embodiments, see Figures 3 to 10 The cap plate assembly 13 includes a pole 134 , which is disposed on the protrusion 132 and electrically connected to the electrode assembly 12 .

[0144] The pole 134 is a portion of the cap assembly 13 that is electrically connected to the pole lug 121 of the electrode assembly 12. The number of poles 134 is at least two, and they are divided into two parts with opposite polarities, one of which is used to electrically connect to the portion of the electrode assembly 12 with a positive polarity to serve as the positive electrode of the battery cell 10, and the other is used to electrically connect to the portion of the electrode assembly 12 with a negative polarity to serve as the negative electrode of the battery cell 10.

[0145] It can be understood that a through hole is provided on the protrusion 132 , and the pole 134 is inserted into 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 .

[0146] In this way, the space utilization rate in the avoidance groove 13b is further improved, which is beneficial to reduce the redundant volume in the installation cavity 10a, 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 rate of the battery.

[0147] In some embodiments, see Fig.13 The pole 134 and the explosion-proof valve 133 are located on the same protrusion 132 and between the two poles 134. In this way, the space between the two poles 134 is effectively utilized, the space utilization rate in the avoidance groove 13b is further improved, and the structure of the battery cell 10 is more compact.

[0148] It can be understood that the specific position of the protrusion 132 on the first wall 11b is not limited.

[0149] In some embodiments, the first center plane 131 a of the battery cell 10 along the length direction thereof coincides with the third center plane 132 a of the protrusion 132 along the length direction of the battery cell 10 .

[0150] 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.

[0151] The third center plane 132 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 protrusion 132 along the length direction thereof.

[0152] In this way, the structure of the battery cell 10 is advantageously made symmetrical about the first center plane 131 a , and the placement direction of the multiple battery cells 10 can be adjusted when they are arranged in the battery module, so as to improve the adaptability of the battery cells 10 .

[0153] In some embodiments, see Fig.11 The spacing between the first center plane 131a of the battery cell 10 along its length direction and the third center plane 132a of the protrusion 132 along the length direction 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%.

[0154] The length of the battery cell 10 is Fig.11 The size value of L1 in the first spacing, i.e. Fig.11 The dimension value of L3 in the figure is: 0<L3 / L1≤47.5%.

[0155] This helps to form a relatively 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 relatively large outer contours in the battery in this area, thus facilitating the arrangement of other components in the battery.

[0156] 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.

[0157] The specific method of measuring the length dimension 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 length direction is measured by a vernier caliper or a ruler.

[0158] The specific method for measuring the length dimension of the protrusion 132 is not limited. For example, the dimension between the end surfaces at both ends of the protrusion 132 along the length direction is measured by a vernier caliper or a ruler.

[0159] The specific method of measuring the first spacing is not limited. For example, the size between the two ends of the battery cell 10 along the length direction and the size between the two ends of the protrusion 132 along the length direction are measured by 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, and the projection images of the two marks are aligned with the scale of the projector to obtain the size of the first spacing.

[0160] In some embodiments, the ratio of the first spacing to the length dimension of the battery cell 10 is greater than 0 and does not exceed 5%;

[0161] Alternatively, the ratio of the first interval to the length dimension of the battery cell 10 ranges from 40% to 47.5%.

[0162] This is further beneficial for 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, so that other components with relatively large outer contour dimensions in the battery can be arranged in this area.

[0163] 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.

[0164] 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.

[0165] 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.

[0166] 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-size position of the battery cell 10 along the width direction.

[0167] 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-size position of the protrusion 132 along the width direction thereof.

[0168] This is further beneficial for the first wall 11 b to form a relatively large flat area along the width direction of the battery cell 10 , so that other components with relatively large outer contour dimensions in the battery can be arranged in this area.

[0169] In some embodiments, see Fig.11 The spacing between the second center plane 131b of the battery cell 10 along its width direction and the fourth center plane 132b 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%.

[0170] The width dimension of the battery cell 10 is Fig.11 The size value of L2 in the middle; the second spacing, that is Fig.11 The dimension value of L4 in the figure is: 0<L4 / L2≤25%.

[0171] In this way, the dimension of the avoidance groove 13b along the width direction can accommodate a part of the electrode assembly 12 and leave a certain redundancy, so as to facilitate the electrode assembly 12 to extend into or out of the avoidance groove 13b.

[0172] 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.

[0173] The specific method of measuring the width dimension 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 width direction is measured by a vernier caliper or a ruler.

[0174] There is no limitation on the specific method of measuring the width dimension of the protrusion 132. For example, the dimension between the end surfaces at both ends of the protrusion 132 along the width direction can be measured by using a vernier caliper or a ruler.

[0175] The specific method of measuring the second spacing is not limited. For example, the size between the two ends of the battery cell 10 along the width direction and the size between the two ends of the protrusion 132 along the width direction are measured by a vernier caliper or a ruler, and the positions of the third center plane 132a and the fourth center plane 132b are calculated. Mark the third center plane 132a and the fourth center plane 132b respectively, place the battery cell 10 on the projector, align the projection images of the two marks with the scale of the projector, and thus obtain the size of the second spacing.

[0176] In some embodiments, the ratio of the second interval to the width of the battery cell 10 is greater than 0 and does not exceed 5%. That is, 0<L4 / L2≤5%.

[0177] In this way, it is more advantageous to make the dimension of the avoidance groove 13 b along the width direction accommodate a part of the electrode assembly 12 and leave some redundancy.

[0178] The specific value of the ratio of the second interval to the width of the battery cell 10 is not limited, for example, 1%, 2%, 3%, 4%, 5%, etc.

[0179] In some embodiments, see Fig.11 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 less than 5% and less than 100%. That is, 5%≤L5 / L1<100%.

[0180] In this way, it is beneficial to ensure that the space in the avoidance groove 13 b meets the requirement of accommodating a part of the electrode assembly 12 .

[0181] 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.

[0182] 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 is in a range of 5% to 37.5%.

[0183] In this way, it is more conducive to making the space in the avoidance groove 13 b meet the requirement of accommodating 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%, 10%, 15%, 20%, 25%, 30%, 35%, 37.5%, etc.

[0185] In some embodiments, see Fig.11 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%. That is, 30%≤L6 / L2<100%.

[0186] In this way, it is beneficial to ensure that the space in the avoidance groove 13 b meets the requirement of accommodating a part of the electrode assembly 12 .

[0187] 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.

[0188] In some embodiments, 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 in a range of 40% to 70%.

[0189] In this way, it is more conducive to making the space in the avoidance groove 13 b meet the requirement of accommodating 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, 40%, 50%, 60%, 70%, etc.

[0191] In some embodiments, see Fig.12 , the ratio of the height of the protrusion 132 to the total height of the battery cell 10 is not greater than 35%. That is, L8 / L7≤35%.

[0192] The height of the protrusion 132 refers to the dimension of the protrusion 132 along the height direction of the battery cell 10 .

[0193] 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.

[0194] In this way, it is beneficial to ensure that the space in the avoidance groove 13b meets the requirement of accommodating a part of the electrode assembly 12 in the height direction, while reducing the problem 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 beneficial to reduce the size of the tab 121.

[0195] 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 is measured by using a vernier caliper or a ruler.

[0196] The specific method for measuring the height of the protrusion 132 is not limited. For example, the dimension between the end surfaces at both ends of the protrusion 132 along the height direction is measured by a vernier caliper or a ruler.

[0197] 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.

[0198] In some embodiments, see Fig.11 The ratio of the height of the protrusion 132 to the total height of the battery cell 10 is in the range of 2.5% to 20%. That is, 2.5%≤L8 / L7≤20%.

[0199] In this way, the problem that the height of the protrusion 132 is too high and thus hinders the arrangement of other components in the battery is further reduced.

[0200] In some embodiments, see Fig.15 and Fig.16 The battery cell 10 includes an explosion-proof valve 133 , which is disposed on the housing 11 .

[0201] That is, a mounting hole is formed on the housing 11 and penetrates the housing 11 in the thickness direction thereof, and the explosion-proof valve 133 is disposed in the mounting hole and sealed with the inner wall of the mounting hole.

[0202] 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 compatible with the arrangement of each battery cell 10 in the battery, thereby improving the safety of battery use.

[0203] The specific position of the explosion-proof valve 133 on the housing 11 is not limited.

[0204] For example, see Fig.15 , the explosion-proof valve 133 is located on the side of the housing 11 away from the protrusion 132. That is to say, the high-temperature airflow ejected from the explosion-proof valve 133 is ejected in a direction away from the protrusion. In this way, the high-temperature airflow is ejected 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 of thermal runaway in the battery, and improving the safety of the battery.

[0205] For example, see Fig.16 The battery cell 10 is a cubic structure, and the explosion-proof valve 133 is located on the wall surface of the housing 11 adjacent to the first wall 11 b.

[0206] In this way, the spray direction of the high-temperature airflow ejected from the explosion-proof valve 133 is 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 battery use.

[0207] Eight specific embodiments are briefly introduced below with reference to the accompanying drawings.

[0208] First embodiment

[0209] See also Figures 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 pole ears 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.

[0210] Second embodiment

[0211] See also Figures 6 to 8 The outer contour of the battery cell 10 is a square, the number of the avoidance area 13a is one, the two pole ears 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 length direction coincides with the third center plane 132a of the protrusion 132 along the length direction of the battery cell 10.

[0212] Third embodiment

[0213] See also Fig. 9 The outer contour of the battery cell 10 is a square, the number of the avoidance areas 13a is two, the two avoidance areas 13a are respectively located at one end of the battery cell 10 along the length direction of the battery cell 10, and the two pole ears 121 are respectively located in the avoidance groove 13b of one avoidance area 13a, and the two pole posts 134 are respectively located on one protrusion 132.

[0214] Fourth embodiment

[0215] See also Fig.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, and the two poles 134 are both located on the protrusion 132 corresponding to the avoidance area 13a.

[0216] Fifth embodiment

[0217] See also Fig.13 The number of the avoidance area 13 a is one, the explosion-proof valve 133 and the two poles 134 are located on the protrusion 132 , and the explosion-proof valve 133 is located between the two poles 134 .

[0218] Sixth embodiment

[0219] See also Fig.14 The number of the avoidance area 13 a is one, the pole 134 is located on the protrusion 132 , and the explosion-proof valve 133 is located on the cover body 131 and is spaced apart from the protrusion 132 .

[0220] Seventh embodiment

[0221] See also Fig.15 The number of the avoidance area 13 a is one, and the explosion-proof valve 133 is located on the side of the housing 11 away from the cover plate assembly 13 .

[0222] Eighth embodiment

[0223] See also Fig.16 The number of the avoidance area 13 a is one, the battery cell 10 is a cubic structure, and the explosion-proof valve 133 is located on the wall surface of the housing 11 adjacent to the first wall 11 b.

[0224] The length of the battery cell 10 ranges from 400 mm (millimeter) to 1500 mm, and the specific value is not limited, for example, 400 mm, 500 mm, 600 mm, 700 mm, 800 mm, 900, 1000 mm, 1200 mm, 1500 mm, etc.

[0225] 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.

[0226] The height of the battery cell 10 may range from 50 mm to 250 mm, and the specific value may be 50 mm, 60 mm, 70 mm, 80 mm, 100 mm, 120 mm, 150 mm, 180 mm, 200 mm, 220 mm, 250 mm, etc.

[0227] The height of the protrusion 132 may range from 5 mm to 10 mm, and the specific value may be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0228] The embodiment of the present invention further provides a cover plate assembly 13, which is used for the battery cell 10. Figures 3 to 8 The cover assembly 13 includes a cover body 131 , and a relief area 13a is provided on the cover body 131 . One side of the relief area 13a along the thickness direction is recessed to form a relief groove 13b , and the other side is protruded to form a protrusion 132 .

[0229] The space in the avoidance groove 13b is used to accommodate at least a portion of the components in the battery cell 10, such as a portion of the electrode assembly 12, which helps to make 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.

[0230] In some embodiments, see Fig. 9 The number of the avoidance areas 13 a is two, and the two avoidance areas 13 a are respectively located at one end of the cover body 131 along the length direction of the cover body 131 .

[0231] In this way, it is beneficial to form a relatively large flat area on the outer surface of the cover plate assembly 13 between the two avoidance areas 13a, so that other components in the battery can be arranged in this area.

[0232] In some embodiments, the length direction of the cover body 131 is the length direction of the battery cell 10 .

[0233] In some embodiments, see Fig.10 The number of the avoidance area 13 a is one, and the avoidance area 13 a is located at one end of the cover body 131 along the length direction of the cover body 131 .

[0234] 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.

[0235] In some embodiments, see Fig.13The cover assembly 13 includes an explosion-proof valve 133, and the explosion-proof valve 133 is arranged on the protrusion 132. In this way, it is beneficial to improve the space utilization rate of the space in the avoidance groove 13b, making the structure of the cover assembly 13 more compact.

[0236] In some embodiments, see Fig.14 The explosion-proof valve 133 is located on the cover body 131 and is spaced apart from the protrusion 132. In this way, the volume of the protrusion 132 can be reduced.

[0237] In some embodiments, see Figure 3 The cover plate assembly 13 includes a pole 134, and the pole 134 is arranged on the protrusion 132, which is beneficial to improve the space utilization rate in the avoidance groove 13b.

[0238] An embodiment of the present invention further provides a battery, which includes a plurality of battery cells 10 according to any one of the aforementioned embodiments.

[0239] 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.

[0240] An embodiment of the present invention further provides an electric device, which includes the battery in the above embodiment, and the battery serves as a power source for the electric device.

[0241] In this way, by adopting the battery in the aforementioned embodiment, the power consumption endurance of the power-consuming device can be effectively improved.

[0242] The various embodiments / implementations provided by the present invention can be combined with each other without causing any contradiction.

[0243] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery cell, characterized in that: The battery cell comprises: 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, characterized in that: 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, characterized in that: 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 claim 1, characterized in that: 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 claim 1, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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 claim 7, characterized in that: 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, characterized in that: 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 claim 1, characterized in that: 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, characterized in that: 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 claim 1, characterized in that: 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, characterized in that: 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, characterized in that: 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 claim 1, characterized in that: 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 claim 1, characterized in that: 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 claim 1, characterized in that 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, characterized in that: 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, characterized in that: The cover plate assembly comprises a cover plate body, and a relief area is arranged on the cover plate body. One side of the relief area along the thickness direction is recessed to form a relief groove, and the other side is protruded to form a protrusion.

23. The cover plate assembly according to claim 22, characterized in that: 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, characterized in that: 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 claim 22, characterized in that 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 claim 22, characterized in that The cover plate assembly includes a pole, and the pole is arranged on the protrusion.

27. A battery, characterized in that: The battery comprises a plurality of the battery cells according to any one of claims 1 to 21.

28. An electrical device, characterized in that: The electrical device comprises the battery according to claim 27, and the battery serves as a power source for the electrical device.

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