Shell, battery monomer, battery and electric device

Abstract

The embodiment of the utility model provides a shell, a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The shell comprises a first side wall and a second side wall which are connected, a containing cavity is defined by the first side wall and the second side wall, the area of the first side wall is smaller than that of the second side wall, and the first side wall is provided with a weakening structure. The weakening structure is arranged on the first side wall, and the weakening structure is easier to deform relative to other parts of the first side wall, so that the overall pulling deformation quantity of the first side wall is increased, the expansion space around the battery cell is increased after the battery cell circularly expands, and the pulling limitation of the edge of the second side wall by the first side wall is weakened; the deformation amount of the second side wall is increased, the pressure borne by the peripheral edge of the battery cell is reduced, and the tendency that the pressure in the battery cell is not uniformly distributed is relieved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a housing, a battery cell, a battery and an electrical device. Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a box and multiple battery cells contained in the box. The battery cell includes a shell, a battery cell and an electrolyte, and the shell is used to contain the battery cell and the electrolyte. The battery cell will produce cyclic expansion during the continuous charging and discharging process. When the shell is subjected to internal pressure, the shell is unevenly stressed and easily deformed and swollen, resulting in uneven distribution of electrolyte inside the battery cell and local lithium precipitation. There is room for improvement. Utility Model Content

[0003] The present application provides a housing, a battery cell, a battery and an electrical device to alleviate the tendency of uneven pressure distribution inside a battery cell after the battery cell cyclically expands.

[0004] In a first aspect, an embodiment of the present application provides a shell, comprising: a first side wall and a second side wall connected to each other, the first side wall and the second side wall define a accommodating cavity, the area of ​​the first side wall is smaller than that of the second side wall, and the first side wall is provided with a weakening structure.

[0005] In the above technical solution, a weakened structure is provided on the first side wall, and the structural stiffness of the weakened structure is less than the structural stiffness of other parts of the first side wall. The weakened structure is easier to deform than other parts of the first side wall, thereby increasing the overall tensile deformation of the first side wall, and increasing the expansion space around the battery cell after the battery cell cyclic expansion. Compared with the structure in which a plurality of right-angle bends are machined on the surface of the shell in the related art, the pulling restriction of the edge of the second side wall by the first side wall is weakened, the deformable amount of the second side wall is increased, the pressure on the edges around the battery cell is reduced, and the trend of uneven pressure distribution inside the battery cell is alleviated.

[0006] In some embodiments, the weakened structure includes: a groove provided on the outer surface of the first side wall.

[0007] In the above technical solution, by setting a groove on the first side wall, when the battery cell expands cyclically, the groove is easily stretched due to its thinness and weak rigidity, thereby increasing the overall tensile deformation of the first side wall and increasing the expansion space of the battery cell, thereby alleviating the problem of high pressure around the battery cell and alleviating the trend of uneven pressure distribution inside the battery cell.

[0008] In some embodiments, the following condition is satisfied: 1≤m≤3, wherein m is the number of the grooves on each of the first side walls.

[0009] In some embodiments, the following conditions are satisfied: 0.5 mm ≤ A0 ≤ 1 mm, 0.2 mm ≤ A1 ≤ 0.4 mm, wherein A0 is the thickness of the first side wall, and A1 is the depth of the groove.

[0010] In some embodiments, 1 / 12≤B≤1 / 4 is satisfied, where B is the ratio of the width of the groove to the width of the first sidewall.

[0011] In some embodiments, at least one end of the first side wall and the second side wall encloses and forms an opening of the accommodating cavity, and the groove extends from one end of the first side wall forming the opening to the other end.

[0012] In some embodiments, the second side wall is provided with a reinforcement structure.

[0013] In the above technical solution, a reinforcement structure is provided on the second side wall, and the structural rigidity of the reinforcement structure is higher than that of other positions of the second side wall, so that the second side wall is not prone to bulging, thereby improving the problem of extrusion in the middle of the battery cell, thereby improving the problem of high pressure in the middle of the battery cell, and alleviating the uneven force on the bulging shell in the middle of the battery cell.

[0014] In some embodiments, the reinforcement structure includes: a protrusion disposed on the outer surface of the second side wall.

[0015] In some embodiments, the protrusions include a plurality of cross-distributed strips; or the protrusions include a plurality of parallel strips distributed at intervals.

[0016] In some embodiments, the wall thickness at the protrusion is not less than the wall thickness at other locations of the second side wall.

[0017] In some embodiments, the following condition is satisfied: 0.1 mm ≤ C ≤ 0.4 mm, wherein C is the height of the protrusion protruding from the second side wall.

[0018] In some embodiments, the following condition is satisfied: 3 mm ≤ D ≤ 12 mm, where D is the width of the protrusion.

[0019] In a second aspect, an embodiment of the present application provides a battery cell, comprising: a shell as described in any one of the above; and a battery cell, wherein the battery cell is disposed in a receiving cavity of the shell.

[0020] In a third aspect, an embodiment of the present application provides a battery, comprising: a plurality of battery cells as described above.

[0021] In a fourth aspect, an embodiment of the present application provides an electrical device, comprising: a battery as described above, wherein the battery is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0024] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0025] Figure 3 A schematic diagram of the expansion state of a battery cell in the related art;

[0026] Figure 4 It is a schematic diagram of a partial structure of a shell in the related art;

[0027] Figure 5 It is a pressure distribution diagram of a battery cell in the related art;

[0028] Figure 6 A side view of a housing provided for some embodiments of the present application;

[0029] Figure 7 for Figure 6 Cross-section at AA;

[0030] Figure 8 One of the partial structural schematic diagrams of a housing provided in some embodiments of the present application;

[0031] Fig. 9 A second schematic diagram of a partial structure of a housing provided in some embodiments of the present application;

[0032] Fig.10 A front view of a housing provided for some embodiments of the present application;

[0033] Fig.11 for Fig.10 Cross-section at the middle BB;

[0034] Fig.12 A top view of a housing provided for some embodiments of the present application.

[0035] Reference numerals:

[0036] Vehicle 1, battery 10, box body 11, first box body 111, second box body 112;

[0037] Battery cell 12, housing 121, first side wall 1211, weakened structure 12111, second side wall 1212, reinforcing structure 12121; battery cell 13;

[0038] Motor 20 and controller 30 . DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0041] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0044] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0045] The battery cells mentioned in the embodiments of the present application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., which are not limited in the embodiments of the present application. The battery cells may be cylindrical, flat, rectangular or other shapes, etc., which are not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells and square battery cells, which are not limited in the embodiments of the present application.

[0046] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells or multiple battery modules. The box can improve the effect of liquid or other foreign matter on the charging or discharging of the battery cells.

[0047] The battery cell includes a shell, a battery cell and an electrolyte, and the shell is used to contain the battery cell and the electrolyte. The battery cell is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0048] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the battery core may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0049] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a box and multiple battery cells contained in the box. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of safety and cycle life.

[0050] The inventors have found that in general power batteries, in order to obtain sufficient power for the battery, multiple battery cells in the battery box are usually stacked in an arrangement. Figure 3 and Figure 4 As shown, the battery cells will cyclically expand during the continuous charge and discharge process. When the shell is subjected to internal pressure, the shell is unevenly stressed and easily deformed and swollen, resulting in uneven distribution of electrolyte inside the battery cells and local lithium deposition. The structure of stacking multiple battery cells will aggravate this phenomenon, which will seriously affect the performance and service life of the battery, and may even cause greater safety hazards during the use of the battery, which is not conducive to the safety of consumers. Figure 4 The direction of the arrow is the direction of the shell force.

[0051] In the related technology, several right-angle bends are usually machined on the shell surface, and several reinforcing ribs are formed on the shell surface through the bends; the reinforcing ribs are concave and convex; the reinforcing ribs are in the same longitudinal direction or the same transverse direction, and the reinforcing ribs can support their structural rigidity on the transverse or longitudinal surface, making the shell surface harder. However, after research, it was found that after the battery cell expands cyclically, the above-mentioned shell-side concave-convex structure will increase the pressure on the battery cell at the concave part and reduce the pressure on the battery cell at the convex part, which will aggravate the uneven pressure on the battery cell after the cyclic expansion.

[0052] Based on the above considerations, in order to solve the Figure 5 In order to solve the problem of uneven pressure distribution in which the middle and edges of the battery cell are subjected to greater pressure and the transition zone is subjected to less pressure after cyclic expansion of the battery cell shown in the figure, the inventor has designed a shell, a battery cell, a battery and an electrical device after in-depth research. The shell includes a first side wall and a second side wall connected to each other, the first side wall and the second side wall define a accommodating cavity, the area of ​​the first side wall is smaller than that of the second side wall, and the first side wall is provided with a weakening structure.

[0053] In a shell of this structure, a weakened structure is provided on the first side wall, and the structural stiffness of the weakened structure is less than the structural stiffness of other parts of the first side wall. The weakened structure is easier to deform than other parts of the first side wall, thereby increasing the overall tensile deformation of the first side wall, and increasing the expansion space around the battery cell after the battery cell cyclically expands. Compared with the structure in which a plurality of right-angle bends are machined on the surface of the shell in the related art, the pulling restriction of the edge of the second side wall by the first side wall is weakened, the deformable amount of the second side wall is increased, the pressure on the edges around the battery cell is reduced, and the trend of uneven pressure distribution inside the battery cell is alleviated.

[0054] The battery disclosed in the embodiment of the present application can be used in, but is not limited to, electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery thermal management system disclosed in the present application and batteries etc. can be used to form the electrical device, which is conducive to improving the scope of application of the battery thermal management system and reducing the difficulty of assembling the battery thermal management system.

[0055] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, 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.

[0056] For the convenience of description, the following embodiments are described by taking a vehicle 10 as an example of an electrical device in an embodiment of the present application.

[0057] like Figure 1 As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 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. A motor 20, a controller 30 and a battery 10 may be arranged inside the vehicle 1. The controller 30 is used to control the battery 10 to supply power to the motor 20. For example, a battery 10 may be arranged at the bottom, front or rear of the vehicle 1. The battery 10 may be used to power the vehicle 1. For example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0058] In order to meet different power usage requirements, the battery 10 may include a plurality of battery cells 12 , wherein the plurality of battery cells 12 may be connected in series, in parallel, or in hybrid connection, where hybrid connection refers to a mixture of series connection and parallel connection.

[0059] like Figure 2 As shown, it is an exploded view of the structure of a battery 10 of an embodiment of the present application. The battery 10 may include a box body 11 and a plurality of battery cells 12, and the battery cells 12 are used to be accommodated in the box body 11. Among them, the box body 11 is used to provide an assembly space for the battery cells 12, and the box body 11 may adopt a variety of structures. In some embodiments, the box body 11 may include a first box body 111 and a second box body 112, and the first box body 111 and the second box body 112 cover each other, and the first box body 111 and the second box body 112 jointly define an assembly space for accommodating the battery cells 12. The second box body 112 may be a hollow structure with one end open, and the first box body 111 may be a plate-like structure, and the first box body 111 covers the open side of the second box body 112, so that the first box body 111 and the second box body 112 jointly define an assembly space; the first box body 111 and the second box body 112 may also be hollow structures with one side open, and the open side of the first box body 111 covers the open side of the second box body 112. Of course, the box body 11 formed by the first box body 111 and the second box body 112 can be in various shapes, such as a cylinder, a cuboid, etc.

[0060] In the battery 10, multiple battery cells 12 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that multiple battery cells 12 are connected in series and in parallel. Multiple battery cells 12 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by multiple battery cells 12 is accommodated in the box 11; of course, the battery 10 can also be a battery module formed by connecting multiple battery cells 12 in series, in parallel, or in a mixed connection, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 11. The battery 10 may also include other structures, for example, the battery 10 may also include a converging component for realizing electrical connection between multiple battery cells 12.

[0061] Each battery cell 12 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 12 may be cylindrical, flat, rectangular or in other shapes. For ease of description, the following description is made by taking the battery cell 12 as a rectangular parallelepiped as an example.

[0062] According to some embodiments of the present application, referring to Figure 6 , and please refer to Fig.11 , Fig.11The present application provides a housing 121, which includes a first side wall 1211 and a second side wall 1212 connected to each other, wherein the first side wall 1211 and the second side wall 1212 define a receiving cavity, wherein the area of ​​the first side wall 1211 is smaller than that of the second side wall 1212, and the first side wall 1211 is provided with a weakening structure 12111.

[0063] The first side wall 1211 and the second side wall 1212 may be integrated. For example, the first side wall 1211 and the second side wall 1212 may be made by machining, stamping, bending or other processing methods.

[0064] Among them, for the battery cell 12 with poles at both ends, the two ends of its shell 121 are open, and the shell 121 includes two oppositely arranged first side walls 1211 and two oppositely arranged second side walls 1212; for the battery cell 12 with poles at one end, one end of its shell 121 is open, and the shell 121 includes two oppositely arranged first side walls 1211, two oppositely arranged second side walls 1212 and another first side wall 1211 located on the bottom surface; multiple first side walls 1211 and multiple second side walls 1212 are connected to define a accommodating cavity, and the accommodating cavity is used to accommodate the battery cell 13.

[0065] Among them, the structural stiffness of the weakened structure 12111 is lower than that of other positions of the first side wall 1211. For example, the structural stiffness of the weakened structure 12111 can be reduced by reducing the wall thickness or changing its structural shape, thereby increasing the amount of tensile deformation when subjected to force, weakening the pulling restriction of the edge of the second side wall 1212 by the first side wall, reducing the pressure on the edges around the battery cell, and alleviating the trend of uneven pressure distribution inside the battery cell.

[0066] The weakened structure 12111 may be a groove or a wave-shaped structure, and the groove may be disposed on the outer surface of the first side wall 1211 and / or disposed on the inner surface of the first side wall 1211 .

[0067] At present, the battery shell of lithium ion is mainly made of aluminum shell, such as Figure 5 As shown in the figure, when the battery cell expands after a cycle, it is easy to form an uneven pressure distribution, where the middle and the edges of the battery cell are under greater pressure, and the transition zone is under less pressure. In the related art, a number of right-angle bends are added to the surface of the shell to increase the structural strength of the shell. However, after research, it was found that the above-mentioned shell-side concave-convex structure will aggravate the uneven pressure on the battery cell after the battery cell expands after a cycle.

[0068] In the present technical solution, a weakened structure 12111 is provided on the first side wall 1211. The structural stiffness of the weakened structure 12111 is less than the structural stiffness of other parts of the first side wall 1211. The weakened structure 12111 is easier to deform than other parts of the first side wall 1211, thereby increasing the overall tensile deformation of the first side wall 1211. After the battery cell 13 cyclically expands, the expansion space around the battery cell 13 is increased. Compared with the structure in which a plurality of right-angle bends are machined on the shell surface in the related art, the pulling restriction of the edge of the second side wall 1212 by the first side wall 1211 is weakened, the deformability of the second side wall 1212 is increased, the pressure on the edges around the battery cell 13 is reduced, and the trend of uneven pressure distribution inside the battery cell 13 is alleviated.

[0069] According to some embodiments of the present application, referring to Figure 6 , and please refer to Figure 7 , Figure 7 The weakening structure 12111 includes a groove disposed on the outer surface of the first side wall 1211 .

[0070] The distance from the bottom of the groove to the inner surface of the first side wall 1211 is smaller than the distance from the outer surface of other parts of the first side wall 1211 to the inner surface of the first side wall 1211, that is, the wall thickness at the groove is smaller than the wall thickness at other parts of the first side wall 1211. In other words, the structural rigidity at the groove is smaller than that at other parts of the first side wall 1211, the groove is easier to deform, and the tensile deformation of the groove is greater than the tensile deformation of other parts of the first side wall 1211, which provides more expansion space for the cyclic expansion of the battery cell 13.

[0071] like Figure 8 and Fig. 9 As shown, by providing a groove on the first side wall 1211, when the battery cell 13 expands cyclically, the groove is stretched because it is thinner and has weaker rigidity, thereby increasing the overall tensile deformation of the first side wall 1211, weakening the pulling restriction of the edge of the second side wall 1212 by the first side wall 1211, and increasing the expansion space of the battery cell 13, thereby alleviating the problem of high pressure around the battery cell 13 and the tendency of uneven pressure distribution inside the battery cell 13. Fig. 9 The direction of the middle arrow is the deformation direction of the groove after being stretched.

[0072] In addition, setting the groove on the outer surface of the first side wall 1211 can improve the adverse effects of the inner wall of the shell 121 on the battery cell 13 when the battery cell 13 expands. The adverse effects of the inner wall of the shell 121 on the battery cell 13 include scratching the battery cell 13 or uneven force on the battery cell causing uneven distribution of internal electrolyte and local lithium deposition.

[0073] In some embodiments, the housing 121 satisfies: 1≤m≤3, where m is the number of grooves on each first side wall 1211 .

[0074] In this embodiment, if Figure 6 As shown, the number of grooves on the first side wall 1211 can be 2. Of course, in other embodiments, the number of grooves on the first side wall 1211 can be 1 or 3, and the multiple grooves are spaced apart on the first side wall 1211. By setting the multiple grooves, a sufficient pulling deformation is provided for the first side wall 1211, and the expansion space around the battery cell 13 is increased after the cyclic expansion of the battery cell 13, thereby reducing the pressure on the edges around the battery cell 13, weakening the pulling restriction of the edge of the second side wall 1212 by the first side wall 1211, and alleviating the trend of uneven pressure distribution inside the battery cell 13.

[0075] Among them, a plurality of grooves may be distributed in parallel and at intervals on the first side wall 1211 , which may provide a sufficient pulling deformation amount for the first side wall 1211 .

[0076] In some embodiments, Figure 7 As shown, the shell 121 satisfies: 0.5mm≤A0≤1mm, 0.2mm≤A1≤0.4mm, wherein A0 is the thickness of the first side wall 1211, and A1 is the depth of the groove.

[0077] The thickness of the first side wall 1211 may be 0.5 mm, 0.7 mm or 1 mm, and the depth of the groove may be 0.2 mm, 0.25 mm or 0.4 mm.

[0078] In some embodiments, the housing 121 satisfies: 1 / 12≤B≤1 / 4, where B is the ratio of the width of the groove to the width of the first side wall 1211. Figure 7 As shown, b0 is the width of the first side wall 1211, b1 is the width of the groove, and B is b1 / b0.

[0079] Among them, the ratio of the width of the groove to the width of the first side wall 1211 can be 1 / 12, 1 / 6 or 1 / 4. By setting the ratio of the width of the groove to the width of the first side wall 1211, the overall tensile deformation of the first side wall 1211 can be increased while the overall structural strength of the first side wall 1211 meets the use requirements.

[0080] In some embodiments, Fig.10 As shown, at least one end of the first side wall 1211 and the second side wall 1212 encloses and forms an opening of the accommodating cavity, and the groove extends from one end of the opening formed by the first side wall 1211 to the other end.

[0081] The intersection line between the first side wall 1211 and the second side wall 1212 provided with the groove is parallel to the extension direction of the groove.

[0082] For a battery cell 12 with poles at both ends, both ends of its shell 121 are open, and grooves are distributed on two first side walls 1211 arranged opposite to each other. The grooves extend from one end of the first side wall 1211 to the other end of the first side wall 1211 along the extension direction of the first side wall 1211, and the extension direction of the grooves is parallel to the intersection line of the first side wall 1211 and the second side wall 1212; for a battery cell 12 with poles at one end, one end of its shell 121 is open, and grooves are distributed on two first side walls 1211 arranged opposite to each other and another first side wall 1211 located on the bottom surface. The grooves surround the three first side walls 1211 of the shell 121, and the grooves on multiple first side walls 1211 may be connected or not.

[0083] By setting the groove on the first side wall 1211, when the battery cell 13 expands cyclically, the shell 121 is easily subjected to tensile deformation at this location due to the thinness and weak rigidity of the groove, thereby increasing the expansion space of the battery cell 13 and weakening the pulling restriction of the edge of the second side wall 1212 by the first side wall, thereby alleviating the problem of high pressure around the battery cell 13.

[0084] According to some embodiments of the present application, referring to Fig.10 , and please refer to Fig.11 , Fig.11 for Fig.10 In the cross-sectional view at the middle BB, the second side wall 1212 is provided with a reinforcement structure 12121 .

[0085] The structural rigidity of the reinforcing structure 12121 is higher than that of other positions of the second side wall 1212. For example, the structural rigidity can be increased by increasing the wall thickness, so that the second side wall 1212 is not prone to bulging, thereby improving the problem of squeezing the middle of the battery cell 13, thereby improving the problem of high pressure in the middle of the battery cell 13, and alleviating the uneven force on the shell 121 in the middle of the battery cell 13. The reinforcing structure 12121 can be a reinforcing rib with increased thickness.

[0086] The reinforcement structure 12121 may be disposed on the inner surface and / or the outer surface of the second side wall 1212 .

[0087] According to some embodiments of the present application, referring to Fig.11 , and please refer to Fig.12 The reinforcement structure 12121 includes: a protrusion arranged on the outer surface of the second side wall 1212 .

[0088] Among them, the protrusion is arranged on the outer surface of the second side wall 1212, which improves the stress concentration of the battery cell 13 caused by the expansion of the battery cell 13, improves the uneven force on the battery cell 13, and at the same time increases the overall structural rigidity of the second side wall 1212, so that the second side wall 1212 is not prone to bulging, improves the problem of squeezing the middle part of the battery cell 13, thereby improving the problem of high pressure in the middle part of the battery cell 13.

[0089] In some embodiments, reference Fig.11 , the wall thickness of the protrusion is not less than the wall thickness of other parts of the second side wall 1212.

[0090] For example, the wall thickness of the protrusion can be the same as the wall thickness of other parts of the second side wall 1212, and the protrusion is a convex structure that is pushed up to increase the overall structural rigidity of the second side wall 1212, while increasing the deformation of the second side wall 1212, thereby improving the problem of extrusion in the middle of the battery cell 13; or the wall thickness of the protrusion is greater than the wall thickness of other parts of the second side wall 1212, thereby increasing the overall structural rigidity of the second side wall 1212, making it less likely for the second side wall 1212 to bulge, thereby improving the problem of extrusion in the middle of the battery cell 13, thereby improving the problem of high pressure in the middle of the battery cell 13.

[0091] In some embodiments, reference Fig.12 The protrusions include multiple cross-distributed protrusions, which may be triangular or rhombus-shaped, and may be horizontally or vertically distributed; or the protrusions include multiple parallel and spaced-apart protrusions. By providing multiple protrusions, sufficient structural rigidity is provided for the second side wall 1212, so that the second side wall 1212 is not prone to bulging, thereby improving the problem of squeezing the middle part of the battery cell 13 and thus improving the problem of uneven force on the battery cell 13.

[0092] In some embodiments, reference Fig.11 The protrusion satisfies: 0.1mm≤C≤0.4mm, where C is the height of the protrusion protruding from the second side wall 1212, for example, C can be 0.1mm, 0.2mm or 0.4mm.

[0093] By setting the protrusion to protrude above the second side wall 1212 , the overall structural rigidity of the second side wall 1212 is increased, so that the second side wall 1212 is less likely to bulge, and at the same time, the assembly of multiple battery cells 12 is not affected.

[0094] In some embodiments, the protrusion satisfies: 3 mm ≤ D ≤ 12 mm, wherein D is the width of the protrusion, for example, D may be 3 mm, 8 mm, or 12 mm.

[0095] By setting the width of the protrusion, the overall structural rigidity of the second side wall 1212 can be increased while reducing the cost.

[0096] On the one hand, the technical solution provides a weakened structure 12111 on the first side wall 1211, the rigidity of the weakened structure 12111 is less than that of other parts of the first side wall 1211, the weakened structure 12111 is more easily deformed than other parts of the first side wall 1211, and the tensile deformation of the weakened structure 12111 is greater than that of other parts of the first side wall 1211, thereby increasing the overall tensile deformation of the first side wall 1211, increasing the expansion space around the battery cell 13 after the battery cell 13 cyclically expands, and weakening the edge of the second side wall 1212 affected by the first side wall 1211. 1 is pulled and limited, thereby reducing the pressure on the edges of the battery cell 13 and alleviating the tendency of uneven pressure distribution inside the battery cell 13; on the other hand, by providing a reinforcing structure 12121 on the second side wall 1212, the structural rigidity of the reinforcing structure 12121 is higher than that of other positions of the second side wall 1212, thereby increasing the structural rigidity of the second side wall 1212, making it less likely for the second side wall 1212 to bulge, thereby improving the problem of squeezing the middle part of the battery cell 13, thereby improving the problem of high pressure in the middle part of the battery cell 13, and alleviating the uneven force on the bulging shell 121 in the middle part of the battery cell 13.

[0097] According to some embodiments of the present application, the present application further provides a battery cell 12 , comprising: a shell 121 and a battery cell 13 as in any of the above solutions, wherein the battery cell 13 is disposed in a receiving cavity of the shell 121 .

[0098] The battery cell 12 of the present technical solution, on the one hand, is provided with a weakening structure 12111 on the first side wall 1211, and the tensile deformation of the weakening structure 12111 is greater than the tensile deformation of other parts of the first side wall 1211, thereby increasing the overall tensile deformation of the first side wall 1211, increasing the expansion space around the battery cell 13 after the battery cell 13 cyclically expands, reducing the pressure on the edges around the battery cell 13, and alleviating the trend of uneven pressure distribution inside the battery cell 13; on the other hand, a reinforcing structure 12121 is provided on the second side wall 1212, and the structural stiffness of the reinforcing structure 12121 is higher than that of other positions of the second side wall 1212, thereby increasing the structural stiffness of the second side wall 1212, making it less likely for the second side wall 1212 to bulge, improving the problem of squeezing the middle part of the battery cell 13, thereby improving the problem of high pressure in the middle part of the battery cell 13, and alleviating the uneven force on the bulging shell 121 in the middle part of the battery cell 13.

[0099] According to some embodiments of the present application, the present application further provides a battery 10 , which includes a plurality of battery cells 12 .

[0100] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 10 of any of the above schemes, and the battery 10 is used to provide electrical energy to the electrical device.

[0101] The electrical device may be any of the aforementioned devices or systems using the battery 10 .

[0102] In a specific embodiment, a groove is provided on the first side wall 1211 of the shell 121, and the groove surrounds the small side and the top cover of the entire shell 121. The thickness of the first side wall 1211 is 0.8 mm, the groove depth is 0.3 mm, the width of the groove is 1 / 8 of the width of the shell 121, and the number of grooves is 2. When the battery cell 13 expands after a cycle, the shell 121 is stretched at this location because the groove is thin and has weak rigidity, which increases the expansion space of the battery cell 13, thereby alleviating the problem of high pressure around the battery cell 13, such as Fig.11 shown.

[0103] The second side wall 1212 of the housing 121 is designed with raised reinforcing ribs. Conventional housings 121 are prone to bulging in the middle of the second side wall 1212. After the reinforcing ribs are designed, the second side wall 1212 is not prone to bulging, which alleviates the problem of squeezing the middle of the battery cell 13. Multiple reinforcing ribs are staggered horizontally and vertically to form a square shape, and the height of the reinforcing ribs is 0.3 mm higher than that of the second side wall 1212.

[0104] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0105] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A housing, characterized in that: Applied to a battery, the shell includes: a first side wall and a second side wall connected to each other, the first side wall and the second side wall define a accommodating cavity, the area of ​​the first side wall is smaller than that of the second side wall, and the first side wall is provided with a weakening structure, which is a groove or a wavy structure.

2. The housing according to claim 1, characterized in that Satisfies: 1≤m≤3, wherein m is the number of the grooves on each of the first side walls.

3. The housing according to claim 1, characterized in that Satisfies: 0.5mm≤A0≤1mm, 0.2mm≤A1≤0.4mm, wherein A0 is the thickness of the first side wall, and A1 is the depth of the groove.

4. The housing according to claim 1, characterized in that Satisfies: 1 / 12≤B≤1 / 4, where B is the ratio of the width of the groove to the width of the first side wall.

5. The housing according to claim 1, characterized in that At least one end of the first side wall and the second side wall encloses and forms an opening of the accommodating cavity, and the groove extends from one end of the first side wall forming the opening to the other end.

6. The housing according to any one of claims 1 to 5, characterized in that: The second side wall is provided with a reinforcement structure, and the reinforcement structure is a protrusion or a reinforcement rib.

7. The housing according to claim 6, characterized in that The protrusions include a plurality of cross-distributed strips; or the protrusions include a plurality of parallel strips distributed at intervals.

8. The housing according to claim 6, characterized in that The wall thickness at the protrusion is not less than the wall thickness at other positions of the second side wall.

9. The housing according to claim 6, characterized in that Satisfies: 0.1 mm ≤ C ≤ 0.4 mm, wherein C is the height of the protrusion protruding from the second side wall.

10. The housing according to claim 6, characterized in that Satisfies: 3mm≤D≤12mm, wherein D is the width of the protrusion.

11. A battery cell, characterized in that: include: The housing according to any one of claims 1 to 10; A battery cell is arranged in the accommodating cavity of the shell.

12. A battery, characterized in that: include: A plurality of battery cells as claimed in claim 11.

13. An electrical device, characterized in that: include: The battery as claimed in claim 12, wherein the battery is used to provide electrical energy to the electrical device.

Images