Housing, battery cell, battery, and electric device

Abstract

A shell, a battery monomer, a battery and a power device, relate to the technical field of battery, the shell includes bottom plate, side plate and transition fillet, the bottom plate has first inner wall surface, the first inner wall surface includes first surface and second surface, the second surface is arranged at the outer circumferential side of the first surface, the side plate has second inner wall surface, the transition fillet has third inner wall surface, the third inner wall surface is connected with the second surface and the second inner wall surface;At least one of the second surface and the third inner wall surface is formed with a recess, and the recess is configured to avoid the corner part of the battery cell.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a casing, a battery cell, a battery, and an electrical device. Background Technology

[0002] In related technologies, during the molding process of the battery cell casing, a transition rounded corner is formed at the bending position, resulting in an uneven bottom inside the casing.

[0003] Therefore, in some technologies, a base plate is usually set separately inside the casing to raise the battery cell to a certain height to prevent the edge of the battery cell from interfering with the inner wall of the casing, which could lead to edge damage, decarbonization, etc. The base plate needs to be assembled separately, which makes the battery cell assembly process more complicated and costly. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the related art. To this end, this application proposes a housing that can prevent the battery cell from being damaged by pressure, while simplifying the structure of the battery cell.

[0005] This application also proposes a battery cell having the aforementioned casing.

[0006] This application also proposes a battery having the aforementioned battery cells.

[0007] This application also proposes an electrical device having the aforementioned battery.

[0008] According to a first aspect embodiment of this application, a housing is provided for accommodating a battery cell. The housing includes a base plate, a side plate, and a transition fillet. The side plate is connected to the outer edge of the base plate, and the transition fillet is connected between the base plate and the side plate. The transition fillet, the side plate, and the base plate define a receiving cavity for accommodating the battery cell. The base plate has a first inner wall surface facing the receiving cavity. The first inner wall surface includes a first surface and a second surface. The second surface is disposed on the outer peripheral side of the first surface. The side plate has a second inner wall surface facing the receiving cavity. The transition fillet has a third inner wall surface facing the receiving cavity. The third inner wall surface connects the second surface and the second inner wall surface. At least one of the second surface and the third inner wall surface is formed with a clearance groove, and the clearance groove is configured to avoid the corner portion of the battery cell.

[0009] According to the embodiments of this application, the housing is provided with at least one of the second surface of the base plate and the third inner wall surface with the transition rounded corner, forming an avoidance groove to increase the distance between the cell and the inner wall surface of the housing, so as to avoid the corners of the cell being crushed by the inner wall surface of the housing. It can be seen that this application does not require a separate base plate to raise the cell to a certain height, thereby saving the assembly and fixing process of the base plate, reducing the installation cost of the base plate, such as the heat fusion cost of fixing the base plate to the housing, reducing the number of battery cell components, and simplifying the structure of the battery cell.

[0010] In some embodiments, the housing has a first reference arcuate surface and a reference plane. The first reference arcuate surface is tangent to the second inner wall surface and the reference plane, respectively. The third inner wall surface is recessed relative to the first reference arcuate surface, so that the third inner wall surface forms the clearance groove. Thus, while ensuring that the corners of the battery cell do not interfere with the base plate and transition fillets, the structure of the clearance groove is simplified, and processing is convenient.

[0011] In some embodiments, both the first surface and the second surface are coplanar with the reference plane; or, at least one of the first surface and the second surface protrudes from the reference plane to form a support protrusion. Thus, the flexible arrangement of the first and second surfaces allows the casing to meet the differentiated requirements of different battery cells.

[0012] In some embodiments, the housing has a first reference arcuate surface and a reference plane. The first reference arcuate surface is tangent to the second inner wall surface and the reference plane, respectively. The second surface is recessed relative to the reference plane to form the avoidance groove. The first surface protrudes from the reference plane to form a support protrusion. The support protrusion can raise the battery cell by a certain height to further keep the corners of the battery cell away from the transition rounded corner and the second surface.

[0013] In some embodiments, the housing has a reference plane, the arcuate surface on which the third inner wall surface is located is tangent to the second inner wall surface and the reference plane respectively, and at least one of the first surface and the second surface protrudes from the reference plane to form a support protrusion. The support protrusion can raise the battery cell to a certain height, so that the corners of the battery cell are further away from the transition fillet and the second surface.

[0014] In some embodiments, the two circumferential ends of the arc-shaped surface where the third inner wall is located are a first end and a second end, respectively. The first end is connected to the second inner wall, and the second end is connected to the reference plane. The second surface protrudes from the reference plane, and the support protrusion extends between the first end and the second end. This ensures the structural strength of the base plate while ensuring that the corners of the battery cell avoid the casing.

[0015] In some embodiments, the projected area of ​​the support protrusion on a plane perpendicular to the thickness direction of the base plate is s1, and the projected area of ​​the base plate on a plane perpendicular to the thickness direction of the base plate is s, where 0.1≤s1 / s≤0.9, so as to facilitate the diverse shape design of the support protrusion while ensuring the reliability of the battery cell setting.

[0016] In some embodiments, at least one of the first surface and the second surface protrudes from the reference plane to form a support protrusion. The height of the support protrusion protruding from the reference plane is h, 0.1 mm ≤ h ≤ 2.0 mm, so as to ensure that the support protrusion lifts the battery cell to a suitable height position so that the corner of the battery cell does not interfere with the inner wall of the housing.

[0017] In some embodiments, the support protrusion includes at least one rib, which extends in a straight line or curve into a long strip shape, facilitating flexible adjustment of the support area of ​​the support protrusion.

[0018] In some embodiments, there are multiple ribs, including at least one first rib and at least one second rib. The first rib extends in a long strip along a first direction, and the second rib extends in a long strip along a second direction. The first direction and the second direction intersect, which helps to ensure stable support of the battery cell by the multiple ribs.

[0019] In some embodiments, the rib includes a third rib that extends in a ring shape along the circumference of the base plate to ensure stable support of the battery cell.

[0020] In some embodiments, there are multiple third ribs, and the multiple third ribs are coaxially arranged to further ensure the stable support of the battery cell by the third ribs.

[0021] In some embodiments, the ribs extend continuously or intermittently to further flexibly adjust the support area of ​​the support protrusions.

[0022] In some embodiments, the support protrusion is formed as a solid protrusion, and the support protrusion is formed as a circular structure, an elliptical structure, or a polygonal structure. Therefore, the support protrusion is flexibly designed to meet diverse practical needs.

[0023] In some embodiments, at least one of the first surface and the second surface is configured to abut against the battery cell; and / or, at least one of the first surface and the second surface is formed with a receiving groove for containing electrolyte, so as to balance the stable setting of the battery cell and the wetting effect of the electrolyte on the bottom of the battery cell.

[0024] In some embodiments, the base plate has an outer wall surface facing away from the receiving cavity, the outer wall surface being formed as a plane to simplify the processing steps of the outer wall surface and facilitate the arrangement of batteries.

[0025] In some embodiments, the housing has a first reference arcuate surface and a reference plane. The first reference arcuate surface is tangent to the second inner wall surface and the reference plane, respectively. The first surface protrudes from the reference plane to form a support protrusion. The bottom plate has an outer wall surface facing away from the receiving cavity. The outer wall surface has a first groove formed therein. The first groove is disposed opposite to the support protrusion, which is beneficial to improving the material utilization rate of the bottom plate.

[0026] In some embodiments, the depth of the first groove is t, where 0 < t ≤ 2 mm; and / or, the height of the support protrusion protruding from the reference plane is equal to the depth of the first groove, so as to ensure the structural strength of the base plate.

[0027] In some embodiments, the base plate has an outer wall surface facing away from the receiving cavity, and the outer wall surface is formed with at least one reinforcing rib, thereby improving the structural strength of the base plate and preventing excessive deformation of the base plate from causing the bottom of the housing to delaminate at the interface with the module pack, which could lead to safety issues.

[0028] In some embodiments, the reinforcing ribs are elongated, simple in structure, and easy to arrange.

[0029] In some embodiments, a first groove is formed on the outer wall surface, and the reinforcing rib is formed on the bottom wall of the first groove, which helps to save space occupied by the housing.

[0030] In some embodiments, if the height of the reinforcing rib is less than or equal to the depth of the first groove, the reinforcing rib is not protruding from the outer wall surface, so as to save space occupied by the housing.

[0031] In some embodiments, the first inner wall surface is further formed with a second groove along the thickness direction of the base plate. The second groove is disposed opposite to the reinforcing rib to improve the material utilization rate of the base plate.

[0032] In some embodiments, the base plate is a one-piece stamped part, which is convenient for processing and forming.

[0033] The battery cell according to the second aspect of this application includes the housing described in the first aspect of this application.

[0034] In some embodiments, the battery cell further includes a battery cell housed within a cavity of the housing, and the battery cell has a bottom wall, a side wall, and a connecting wall. The connecting wall connects the bottom wall and the side wall and extends along the length direction of the transition fillet. The battery cell also has a second reference arcuate surface, which is tangent to the bottom wall and the side wall, respectively. The connecting wall is located radially inside the second reference arcuate surface.

[0035] The battery according to the third aspect of this application includes the battery cell of the second aspect of this application described above.

[0036] An electrical device according to a fourth aspect of this application includes a battery according to the third aspect of this application described above, the battery being used to provide electrical energy.

[0037] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0038] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0039] Figure 1 These are schematic diagrams of electrical devices according to some embodiments of this application;

[0040] Figure 2 This is an exploded view of a battery according to some embodiments of this application;

[0041] Figure 3 yes Figure 2 A schematic diagram of the battery module shown;

[0042] Figure 4 These are exploded views of a battery cell according to some embodiments of this application;

[0043] Figure 5 yes Figure 4 Another schematic diagram of the battery cell shown;

[0044] Figure 6 It is along Figure 5 Sectional view of line AA in the middle;

[0045] Figures 7a-7k This is a partial cross-sectional view of the housing according to several embodiments of this application;

[0046] Figure 8 yes Figure 7i The cross-sectional view of the casing shown;

[0047] Figure 9 yes Figure 8 Enlarged view of section C, shown in the center circle;

[0048] Figure 10 yes Figure 8 The bottom view of the casing shown;

[0049] Figures 11a-11g This is a top view of the housing according to several embodiments of this application;

[0050] Figure 12 This is a partial cross-sectional view of the housing according to some embodiments of this application;

[0051] Figure 13 This is a cross-sectional view of a battery cell according to some embodiments of this application;

[0052] Figure 14 yes Figure 13 Enlarged view of section D shown in the center circle;

[0053] Figure 15 yes Figure 13 The cross-sectional view of the casing shown;

[0054] Figure 16 yes Figure 15 Another cross-sectional view of the casing shown;

[0055] Figure 17 yes Figure 16 An enlarged view of section E, shown in the center circle;

[0056] Figure 18 yes Figure 16 The bottom view of the casing shown;

[0057] Figure 19 This is a top view of the housing according to some embodiments of this application;

[0058] Figure 20 It is along Figure 19 Sectional view of the middle FF line;

[0059] Figure 21 yes Figure 20 A magnified view of section G, shown in the center circle;

[0060] Figure 22 yes Figure 19 The bottom view of the casing shown;

[0061] Figure 23 This is a bottom view of the housing according to some embodiments of this application;

[0062] Figures 24a-24j This is a partial cross-sectional view of a battery cell according to several embodiments of this application.

[0063] Figure label:

[0064] Electrical device 1000, battery 200, controller 300, motor 400, battery cell 100, battery module 101, housing 102, first housing section 102a, second housing section 102b, accommodating space 102c, shell 1, clearance groove 1a, accommodating cavity 10, opening 10a, first reference arc surface R1, first end R11, second end R12, reference plane R2, base plate 11, first inner wall surface 11a, first surface 11b, second surface 11c, accommodating groove 11d, outer wall Surface 11e, first groove 11f, second groove 11g, support protrusion 111, rib 1111, first rib 1111a, second rib 1111b, third rib 1111c, reinforcing rib 112, side plate 12, second inner wall surface 12a, transition rounded corner 13, third inner wall surface 13a, top cover 2, battery cell 3, second reference arc-shaped curved surface R3, main body 31, electrode 32, bottom wall 311, side wall 312, connecting wall 313, insulating film 4, first insulating part 41, second insulating part 42. Detailed Implementation

[0065] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0066] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0067] The terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0068] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0069] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0070] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0071] In this application, the battery cell 100 may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited to this. The battery cell 100 may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to this. The battery cell 100 is generally divided into three types according to the packaging method: cylindrical battery cell, square battery cell, and pouch battery cell, and the embodiments of this application are not limited to this.

[0072] The battery 200 mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells 100 to provide higher voltage and capacity. For example, the battery 200 mentioned in this application may be a battery module 101 or a battery pack, etc. The battery 200 generally includes a housing 102 for encapsulating one or more battery cells 100, which can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells 100; of course, the battery 200 may also not include the housing 102.

[0073] For example, a battery cell 100 includes a cell 3 and an electrolyte. The cell 3 consists of a positive electrode, a negative electrode, and a separator. The battery cell 100 mainly operates by the movement of metal ions between the positive and negative electrode. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer, and serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer, and serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and multiple negative electrode tabs stacked together. The battery cell 100 also includes a housing 1 and a top cover 2. The housing 1 has an opening 10a, and the top cover 2 covers the opening 10a and seals it, so that the housing 1 and the top cover 2 form a receiving cavity 10 for accommodating the battery cell 3 and the electrolyte. The housing 1 can be made of materials such as aluminum, aluminum alloy, or plastic. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). Of course, the battery cell 100 using solid electrolyte may not require a separator.

[0074] The inventors discovered that during the molding process of the battery cell casing, a transition rounded corner is formed at the bending position, which makes the bottom of the casing uneven. Usually, a bottom support plate is set separately inside the casing to avoid interference between the edge of the cell and the inner wall of the casing, which leads to complicated assembly process.

[0075] In view of this, this application provides a technical solution that, while ensuring the structural strength and reliability of the casing 1, increases the distance between the battery cell 3 and the inner wall of the casing 1 by forming a relief groove 1a on at least one of the second surface 11b of the base plate 11 and the third inner wall surface 13a of the transition fillet 13. This ensures a suitable distance between the corner of the battery cell 3 and the transition fillet 13 of the casing 1, preventing the corner of the battery cell 3 from being damaged by the transition fillet 13, which could lead to decarbonization, reduced capacity, and short circuits. Therefore, this application eliminates the need for a separate base plate on the casing 1 to elevate the battery cell 3, thus saving on the assembly and fixing processes of the base plate, reducing the installation cost (e.g., the cost of hot-melt fixing the base plate to the casing 1), reducing the number of components in the battery cell 100, and simplifying the structure of the battery cell 100. The technical solution described in this application is applicable to the battery 200 and the electrical device 1000 using the battery 200, where the battery 200 provides electrical energy.

[0076] Electrical device 1000 can be a vehicle, mobile phone, portable device, laptop, ship, spacecraft, electric toy, and power tool, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application embodiment does not impose any special limitations on the above-mentioned electrical device 1000.

[0077] For ease of explanation, the following embodiments will use a vehicle as an example to illustrate the electrical device 1000.

[0078] Figure 1 The diagram shows the structural features of a vehicle as provided in some embodiments of this application. Figure 1 As shown, the vehicle is equipped with a battery 200, which can be located at the bottom, front, or rear of the vehicle. The battery 200 can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The vehicle may also include a controller 300 and a motor 400. The controller 300 controls the battery 200 to supply power to the motor 400, for example, to meet the vehicle's power needs during starting, navigation, and driving. In some embodiments of this application, the battery 200 can not only serve as the vehicle's operating power source but also as its driving power source, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0079] Figure 2 This is a schematic diagram of a battery 200 provided in some embodiments of this application. For example... Figure 2 As shown, the battery includes a housing 102 and a battery cell 100, with the battery cell 100 housed within the housing 102. The housing 102 is used to house the battery cell 100, and the housing 102 can have various structures. In some embodiments, the housing 102 may include a first housing portion 102a and a second housing portion 102b, which overlap each other, and the first housing portion 102a and the second housing portion 102b together define a housing space 102c for housing the battery cell 100. The second box portion 102b can be a hollow structure with one end open, and the first box portion 102a is a plate-like structure. The first box portion 102a covers the open side of the second box portion 102b to form a box 102 with a receiving space 102c. Alternatively, both the first box portion 102a and the second box portion 102b can be hollow structures with one side open, and the open side of the first box portion 102a covers the open side of the second box portion 102b to form a box 102 with a receiving space 102c. Of course, the first box portion 102a and the second box portion 102b can be of various shapes, such as cylinders, cuboids, etc.

[0080] To improve the sealing performance after the first housing part 102a and the second housing part 102b are connected, a sealing element, such as sealant or a sealing ring, can also be provided between the first housing part 102a and the second housing part 102b. Assuming that the first housing part 102a covers the top of the second housing part 102b, the first housing part 102a can also be referred to as the upper housing cover, and the second housing part 102b can also be referred to as the lower housing.

[0081] In battery 200, there can be one or more battery cells 100. If there are multiple battery cells 100, they can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery cells 100 are connected in both series and parallel. Multiple battery cells 100 can be directly connected in series, in parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 100 is housed in the housing 102. Alternatively, multiple battery cells 100 can first be connected in series, in parallel, or in a mixed manner to form a battery module 101, and then multiple battery modules 101 can be connected in series, in parallel, or in a mixed manner to form a whole assembly, which is then housed in the housing 102.

[0082] Figure 3This is a schematic diagram of a battery module 101 provided in some embodiments of this application. In some embodiments, the battery module 101 includes a plurality of battery cells 100, which are first connected in series, parallel, or in a mixed manner to form the battery module 101. The plurality of battery modules 101 are then connected in series, parallel, or in a mixed manner to form a whole and are housed within a housing 102. The plurality of battery cells 100 in the battery module 101 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of the plurality of battery cells 100 in the battery module 101.

[0083] Figure 4 This is a schematic diagram of a battery cell 100 provided in some embodiments of this application. For example... Figure 4 and Figure 5 As shown, the battery cell 100 includes a cell 3, a housing 1, and a top cover 2. An opening 10a is formed at one end of the receiving cavity 10 away from the bottom plate 11. The top cover 2 is placed over the opening 10a and is fixedly connected to the side plate 12. The cell 3 is disposed in the receiving cavity 10.

[0084] As can be seen, the shell 1 is a hollow structure, with an internal cavity 10 for accommodating the battery cell 3 and the electrolyte. The shell 1 can be of various shapes, such as a cuboid or a hexagonal prism. The shape of the shell 1 can be determined according to the specific shape of the battery cell 3. For example, if the battery cell 3 is a cuboid structure, a cuboid shell 1 can be used. The top cover 2 is sealed to the shell 1 to form a sealed space for accommodating the battery cell 3 and the electrolyte; exemplaryly, the top cover 2 is connected to the shell 1 by welding.

[0085] The battery cell 3 is the core component for enabling the charging and discharging function of the battery cell 100. There can be one or more battery cells 3, and this application does not impose specific limitations. The battery cell 3 includes a first electrode, a second electrode, and a separator. The first and second electrodes have opposite polarities, and the separator is used to insulate and isolate the first and second electrodes. The battery cell 3 mainly relies on the movement of metal ions between the first and second electrodes to operate. One of the first and second electrodes is the positive electrode, and the other is the negative electrode. There can be one or more first electrodes and one or more second electrodes; the number of first and second electrodes can be determined according to the structure of the electrode assembly 10.

[0086] In some embodiments, the battery cell 3 may be a wound battery cell, a laminated battery cell, or other types of structures.

[0087] When cell 3 is a laminated cell, cell 3 may include several laminated negative electrode sheets and several laminated positive electrode sheets. The several negative electrode sheets are identical in composition and size (length × width × thickness), and the several positive electrode sheets are also identical in composition and size (length × width × thickness). Thus, the total length L1 of the negative current collector in this application is the sum of the lengths of the negative current collectors in the several negative electrode sheets (that is, the product of the length of the negative current collector in a certain negative electrode sheet and the number of negative electrode sheets), and the total length L2 of the positive current collector in this application is the sum of the lengths of the positive current collectors in the several positive electrode sheets (that is, the product of the length of the positive current collector in a certain positive electrode sheet and the number of positive electrode sheets). Since the several negative electrode sheets have the same size (length × width × thickness), the width and thickness of the negative current collector in this application are consistent with the width and thickness of the negative current collector in a certain negative electrode sheet. Similarly, since several positive electrode plates have the same dimensions (length × width × thickness), the width and thickness of the positive current collector in this application are consistent with the width and thickness of the positive current collector in one of the positive electrode plates. When the battery cell 3 is a wound battery cell, the negative electrode tabs can be evenly distributed on the negative electrode plate, and the positive electrode tabs can be evenly distributed on the positive electrode plate.

[0088] In some embodiments, the battery cell 100 further includes two electrode terminals mounted on the top cover 2, which are respectively used to electrically connect with the first electrode and the second electrode to conduct electrical energy generated by the cell 3.

[0089] In some embodiments, the battery cell 3 includes a main body 31 and tabs 32 connected to the main body 31. The main body 31 is the electrogenerating part of the battery cell 3, and the active material inside it is used to undergo an electrochemical reaction with an electrolyte or the like to generate a charging and discharging process. The tabs 32 extend from the end of the main body 31 and are used to connect to electrode terminals to conduct the electrical energy generated by the main body 31. The main body 31 includes a positive current collector, a positive active material layer, a negative current collector, a negative active material layer, and a separator, and the tabs 32 include a positive tab and a negative tab.

[0090] Hereinafter, with reference to the accompanying drawings, the structure of the housing 1 provided in some embodiments of this application will be described.

[0091] like Figure 6 , Figures 7a-7k As shown, the housing 1 includes a base plate 11, a side plate 12 and a transition fillet 13. The side plate 12 is connected to the outer edge of the base plate 11, and the transition fillet 13 is connected between the base plate 11 and the side plate 12. The transition fillet 13, the side plate 12 and the base plate 11 define a receiving cavity 10, which is used to receive the battery cell 3.

[0092] like Figures 7a-7kAs shown, the base plate 11 has a first inner wall surface 11a facing the receiving cavity 10. At least a portion of the first inner wall surface 11a is used to support the battery cell 3. The first inner wall surface 11a includes a first surface 11b and a second surface 11c. The second surface 11c is disposed on the outer peripheral side of the first surface 11b. The side plate 12 has a second inner wall surface 12a facing the receiving cavity 10. The transition fillet 13 has a third inner wall surface 13a facing the receiving cavity 10. The third inner wall surface 13a connects the second surface 11c and the second inner wall surface 12a.

[0093] At least one of the second surface 11c and the third inner wall surface 13a has a clearance groove 1a. The clearance groove 1a is configured to avoid the corner portion of the battery cell 3, which corresponds to the corner portion of the transition fillet 13. The clearance groove 1a extends along the length direction of the transition fillet 13. When the battery cell 3 is placed on the base plate 11, the corner portion of the battery cell 3 will not interfere with the second surface 11c and the third inner wall surface 13a. This prevents the corner portion of the battery cell 3 from being damaged by the second surface 11c and the third inner wall surface 13a, which could lead to decarburization, reduced capacity, or short circuits, thus ensuring the reliability and safety of the battery cell 3. The corner portion of the battery cell 3 can be understood as the part where two adjacent surfaces of the battery cell 3 meet.

[0094] For example, when the second surface 11c has a relief groove 1a, the second surface 11c is recessed relative to at least one of the first surface 11b and the third inner wall surface 13a; when the third inner wall surface 13a has a relief groove 1a, the third inner wall surface 13a is recessed relative to at least one of the second surface 11c and the second inner wall surface 12a; when both the second surface 11c and the third inner wall surface 13a have relief grooves 1a, the second surface 11c is recessed relative to the first surface 11b, and the third inner wall surface 13a is recessed relative to the second inner wall surface 12a.

[0095] As can be seen, when the casing 1 is used for the battery 200, the battery cell 3 can be directly placed on the base plate 11, which can ensure that the corners of the battery cell 3 will not be damaged. Compared with some technologies that set a bottom support plate in the receiving cavity to raise the battery cell to a certain height and avoid damage to the battery cell edge, this application does not require a separate bottom support plate, saving the assembly process and installation cost of the bottom support plate (for example, the cost of heat-melting the bottom support plate to the bottom of the insulating film wrapped around the battery cell. In related technologies, the battery cell is housed in a bag-shaped insulating film to ensure that the battery cell is insulated from the casing, and the bottom support plate is fixed to the bottom surface of the bag-shaped insulating film by heat-melting).

[0096] It is understood that the first surface 11b and the second surface 11c can be directly connected, or the first surface 11b and the second surface 11c can be spaced apart, and the first surface 11b and the second surface 11c can be indirectly connected through other parts of the first inner wall surface 11a.

[0097] For example, the housing 1 includes a plurality of side plates 12 arranged around a base plate 11, each side plate 12 having a transition fillet 13 between it and the base plate 11. At least one of the corresponding second surfaces 11c and corresponding third inner wall surfaces 13a of the plurality of side plates 12 are formed with a clearance groove 1a. Figure 4 In the example, there are four side plates 12, namely a front side plate, a rear side plate, a left side plate, and a right side plate. At least one of the second surface 11c corresponding to the front side plate and the third inner wall surface 13a corresponding to the front side plate is formed with a clearance groove 1a, and / or at least one of the second surface 11c corresponding to the rear side plate and the third inner wall surface 13a corresponding to the rear side plate is formed with a clearance groove 1a, and / or at least one of the second surface 11c corresponding to the left side plate and the third inner wall surface 13a corresponding to the left side plate is formed with a clearance groove 1a, and / or at least one of the second surface 11c corresponding to the right side plate and the third inner wall surface 13a corresponding to the right side plate is formed with a clearance groove 1a.

[0098] It should be noted that in the description of this application, the terms "front," "rear," "left," "right," "top," "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. For example, regarding the aforementioned front panel, when the battery 200 is in use, the front panel can be located on the front, rear, top, bottom, left, or right side of the battery 200, etc.

[0099] According to the embodiments of this application, the housing 1 of the battery cell 100 has a relief groove 1a formed by at least one of the second surface 11b of the base plate 11 and the third inner wall surface 13a of the transition rounded corner 13. This increases the distance between the cell 3 and the inner wall surface of the housing 1, so that the corner of the cell 3 has a suitable distance from the inner wall surface of the housing 1, thus avoiding the corner of the cell 3 being crushed by the transition rounded corner 13, which would cause the cell 3 to decarbonize, resulting in a reduction in the capacity of the cell 3 and a tendency for the cell 3 to short-circuit. It can be seen that this application does not require a separate bottom support plate to raise the cell 3 to a certain height on the housing 1, thereby saving the assembly and fixing process of the bottom support plate, saving the installation cost of the bottom support plate, such as the heat fusion cost of fixing the bottom support plate to the housing 1, reducing the number of parts of the battery cell 100, simplifying the structure of the battery cell 100, and improving the assembly efficiency and production efficiency of the battery cell 100.

[0100] It is understandable that the depth and cross-sectional shape of the clearance groove 1a can be specifically set according to actual needs; for example, in Figures 7a-7k In the example, the wall of the clearance groove 1a can be a plane or a curved surface.

[0101] In some embodiments, such as Figures 7a-7d As shown, the housing 1 has a first reference arcuate surface R1 and a reference plane R2. The first reference arcuate surface R1 is tangent to the second inner wall surface 12a and the reference plane R2, respectively. The third inner wall surface 13a is recessed relative to the first reference arcuate surface R1, so that the third inner wall surface 13a forms a relief groove 1a. At this time, the third inner wall surface 13a is also recessed relative to the second inner wall surface 12a. It can be seen that, under the premise of ensuring that the corners of the battery cell 3 do not interfere with the base plate 11 and the transition fillet 13, the relief groove 1a has a simple structure and is easy to process.

[0102] In some embodiments, such as Figure 7a As shown, the first surface 11b and the second surface 11c are both coplanar with the reference plane R2, that is, the first surface 11b and the second surface 11c are both located on the reference plane R2. At this time, the second surface 11c does not need to be processed with the avoidance groove 1a. The avoidance of the corner parts of the battery cell 3 can be achieved by the avoidance groove 1a on the third inner wall surface 13a alone. This saves the processing steps of the housing 1 and reduces the cost. At the same time, the battery cell 3 can be directly set on the first surface 11b and the second surface 11c, which helps to ensure the utilization rate of the receiving cavity 10 and ensure the energy density of the battery 200.

[0103] Of course, in other embodiments of this application, such as Figures 7b-7dAs shown, at least one of the first surface 11b and the second surface 11c protrudes from the reference plane R2 to form a support protrusion 111. The portion of the base plate 11 protruding from the reference plane R2 can form the support protrusion 111. The support protrusion 111 is part of the base plate 11, or in other words, the support protrusion 111 is integrally formed into the main body of the base plate 11. The support protrusion 111 can elevate the battery cell 3 by a certain height, further distancing the corners of the battery cell 3 from the transition rounded corner 13, thus protecting the battery cell 3. In this case, the battery cell 3 can be directly mounted on the support protrusion 111, or in other words, the battery cell 3 can be directly mounted on one of the first surface 11b and the second surface 11c. Therefore, the first surface 11b and the second surface 11c are flexibly arranged, allowing the housing 1 to meet the differentiated needs of different battery cells 100.

[0104] For example, in Figure 7b In the example, the third inner wall surface 13a is recessed relative to the first reference arcuate surface R1, and the first surface 11b and the second surface 11c are both protruding from the reference plane R2, such that the portion of the base plate 11 corresponding to the first surface 11b and the second surface 11c that protrudes from the reference plane R2 forms a supporting protrusion 111. At this time, on the plane where the base plate 11 is located, the supporting protrusion 111 contacts the third inner wall surface 13a for direct connection; for another example, in Figure 7c In the example, the third inner wall surface 13a is recessed relative to the first reference arcuate surface R1, the first surface 11b is coplanar with the reference plane R2, and the second surface 11c protrudes from the reference plane R2, such that the portion of the base plate 11 corresponding to the second surface 11c that protrudes from the reference plane R2 forms a supporting protrusion 111. At this time, on the plane where the base plate 11 is located, the supporting protrusion 111 contacts the third inner wall surface 13a for direct connection; for another example, in Figure 7d In the example, the third inner wall surface 13a is recessed relative to the first reference arc surface R1, the second surface 11c is coplanar with the reference plane R2, and the first surface 11b protrudes from the reference plane R2, so that the part of the base plate 11 corresponding to the first surface 11b that protrudes from the reference plane R2 forms a support protrusion 111. At this time, on the plane where the base plate 11 is located, the support protrusion 111 is spaced apart from the third inner wall surface 13a.

[0105] In some embodiments, such as Figure 7e and Figure 7fAs shown, the housing 1 has a first reference arcuate surface R1 and a reference plane R2. The first reference arcuate surface R1 is tangent to the second inner wall surface 12a and the reference plane R2, respectively. The second surface 11c is recessed relative to the reference plane R2 so that the second surface 11c forms a relief groove 1a. The first surface 11b protrudes from the reference plane R2 to form a support protrusion 111. The support protrusion 111 can raise the battery cell 3 to a certain height, so that the corners of the battery cell 3 are further away from the transition fillet 13 and the second surface 11c, avoiding interference between the connection position of the second surface 11c and the third inner wall surface 13a and the corners of the battery cell 3, thereby achieving the effect of protecting the battery cell 3. At this time, the battery cell 3 can be directly set on the first surface 11b, and on the plane where the base plate 11 is located, the support protrusion 111 contacts the third inner wall surface 13a for direct connection.

[0106] It is understandable that when the second surface 11c is recessed relative to the reference plane R2 and the first surface 11b protrudes from the reference plane R2, the third inner wall surface 13a is configured as follows: Figure 7e As shown, the third inner wall surface 13a can be tangent to the second inner wall surface 12a and the reference plane R2 respectively, and the third inner wall surface 13a can be formed as an arc-shaped curved surface; or, as shown... Figure 7f As shown, the third inner wall surface 13a is recessed relative to the first reference arcuate surface R1, so that the third inner wall surface 13a forms a relief groove 1a. At this time, the depth of the relief groove 1a of the second surface 11c and the depth of the relief groove 1a of the third inner wall surface 13a can be equal or unequal.

[0107] In some embodiments, such as Figure 7g-Figure 7k As shown, the housing 1 has a reference plane R2. The arc-shaped surface where the third inner wall surface 13a is located (e.g., the first reference arc-shaped surface R1) is tangent to the second inner wall surface 12a and the reference plane R2, respectively. At least one of the first surface 11b and the second surface 11c protrudes from the reference plane R2 to form a support protrusion 111. The support protrusion 111 can raise the battery cell 3 by a certain height, so that the corner of the battery cell 3 is further away from the transition fillet 13 and the second surface 11c, avoiding interference between the connection position of the second surface 11c and the third inner wall surface 13a and the corner of the battery cell 3, thereby achieving the effect of protecting the battery cell 3. At this time, the battery cell 3 can be directly disposed on at least one of the first surface 11b and the second surface 11c.

[0108] For example, in Figure 7gIn the example, the third inner wall surface 13a is tangent to the second inner wall surface 12a and the reference plane R2, respectively, and the third inner wall surface 13a is formed as an arc-shaped curved surface. The first surface 11b and the second surface 11c are both set to protrude from the reference plane R2, such that the portion of the base plate 11 corresponding to the first surface 11b and the second surface 11c that protrudes from the reference plane R2 forms a supporting protrusion 111. At this time, the third inner wall surface 13a is recessed relative to the second surface 11c, so that the third inner wall surface 13a forms a relief groove 1a, and on the plane where the base plate 11 is located, the supporting protrusion 111 contacts the third inner wall surface 13a for direct connection; for example, in Figure 7h In the example, the third inner wall surface 13a is tangent to the second inner wall surface 12a and the reference plane R2, respectively, and the third inner wall surface 13a is formed as an arc-shaped curved surface. The first surface 11b is coplanar with the reference plane R2, and the second surface 11c protrudes from the reference plane R2, such that the portion of the base plate 11 corresponding to the second surface 11c that protrudes from the reference plane R2 forms a supporting protrusion 111. At this time, the third inner wall surface 13a is recessed relative to the second surface 11c, so that the third inner wall surface 13a forms a relief groove 1a, and on the plane where the base plate 11 is located, the supporting protrusion 111 contacts the third inner wall surface 13a for direct connection; for another example, in Figure 7i In the example, the third inner wall surface 13a is tangent to the second inner wall surface 12a and the reference plane R2, respectively, and the third inner wall surface 13a is formed as an arc-shaped curved surface. The second surface 11c is coplanar with the reference plane R2, and the first surface 11b protrudes from the reference plane R2, so that the part of the base plate 11 corresponding to the first surface 11b that protrudes from the reference plane R2 forms a support protrusion 111. At this time, the second surface 11c is recessed relative to the first surface 11b, so that the second surface 11c forms a relief groove 1a, and on the plane where the base plate 11 is located, the support protrusion 111 and the third inner wall surface 13a are spaced apart.

[0109] In some embodiments, such as Figure 7j and Figure 7k As shown, the two ends of the arc-shaped surface where the third inner wall surface 13a is located are the first end R11 and the second end R12, respectively. The first end R11 is connected to the second inner wall surface 12a, and the second end R12 is located away from the second inner wall surface 12a. The second end R12 is connected to the reference plane R2. The second surface 11c protrudes from the reference plane R2. The support protrusion 111 extends between the first end R11 and the second end R12. At this time, on the plane where the base plate 11 is located, the support protrusion 111 contacts the third inner wall surface 13a for direct connection. The support protrusion 111 is connected between the two ends of the first reference arc-shaped surface R1. Similarly, the battery cell 3 can be raised to a certain height so that the corner of the battery cell 3 avoids the housing 1. The battery cell 3 can be directly set on the second surface 11c, which also helps to ensure the structural strength of the base plate 11.

[0110] It is understandable that when the support protrusion 111 extends between the first end R11 and the second end R12, the first surface 11b is flush with the reference plane R2 (e.g., Figure 7j (as shown), or the first surface 11b is set to protrude from the reference plane R2 to be flush with the second surface 11c (as shown). Figure 7k (As shown) or not level.

[0111] It should be noted that, in the description of this application, the first surface 11b is coplanar with the reference plane R2, which can be understood as the first surface 11b being formed as a part of the reference plane R2, and the second surface 11c is coplanar with the reference plane R2, which can be understood as the second surface 11c being formed as a part of the reference plane R2. Therefore, the "first reference arcuate surface R1," "reference plane R2," and the "second reference arcuate surface R3" mentioned later in this application are not the actual surfaces of the housing 1, but merely auxiliary reference surfaces used to define the actual surfaces of the housing 1 and the battery cell 3.

[0112] In some embodiments, the projected area of ​​the support protrusion 111 along the thickness direction of the base plate 11 is s1, and the projected area of ​​the base plate 11 along its thickness direction is s, where 0.1≤s1 / s≤0.9. The surface area of ​​the support protrusion 111 used to support the battery cell 3 can be flexibly set according to actual needs. This allows for diverse shape designs of the support protrusion 111 while ensuring the reliable installation of the battery cell 3. It also facilitates a suitable abutment area between the support protrusion 111 and the bottom surface of the battery cell 3, ensuring the wetting effect of the electrolyte on the bottom of the battery cell 3.

[0113] Optionally, s1 / s can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.9, etc.

[0114] In some embodiments, such as Figures 7a-7k As shown, the support protrusion 111 protrudes above the reference plane R2 at a height of h, 0.1mm ≤ h ≤ 2.0mm, to ensure that the support protrusion 111 raises the battery cell 3 to a suitable height, thereby ensuring that there is a certain distance between the corner of the battery cell 3 and the inner wall of the housing 1, so that the corner of the battery cell 3 does not interfere with the inner wall of the housing 1. For example, h can be greater than or equal to the radius of the first reference arc; of course, h can also be appropriately smaller than the radius of the first reference arc. Optionally, h can be 0.1mm, 0.5mm, 0.8mm, 1mm, 1.3mm, 1.5mm, 1.8mm, or 2mm.

[0115] In some embodiments, such as Figures 11a-11gAs shown, the support protrusion 111 includes at least one rib 1111. The rib 1111 extends in a straight line or curve into an elongated shape to facilitate flexible arrangement of the rib 1111. It also allows for adjustment of the support area of ​​the support protrusion 111 by adjusting at least one of the top surface area of ​​the rib 1111 and the number of ribs 1111, thus ensuring stable positioning of the battery cell 3. It is understood that the length, width, and cross-sectional shape of the rib 1111 can be specifically set according to actual needs.

[0116] In some embodiments, such as Figures 11a-11c As shown, there are multiple ribs 1111, and each rib 1111 includes at least one first rib 1111a and at least one second rib 1111b. The first rib 1111a extends into an elongated shape along a first direction, and the second rib 1111b extends into an elongated shape along a second direction. The first and second directions intersect, but are not parallel, to ensure stable support of the battery cell 3 by the multiple ribs 1111. Of course, in other embodiments of this application, the multiple ribs 1111 may extend in the same direction, so that the multiple ribs 1111 are arranged in parallel.

[0117] In some embodiments, such as Figure 11b and Figure 11c As shown, the first rib 1111a and the second rib 1111b are intersecting to ensure the support stability of the supporting protrusion 111. Optionally, in Figure 11b and Figure 11c In the example, the first rib 1111a and the second rib 1111b intersect perpendicularly. In this case, the number of the first rib 1111a and the number of the second rib 1111b can be equal or unequal. Of course, the angle between the first rib 1111a and the second rib 1111b can also be an acute angle.

[0118] In other embodiments of this application, such as Figure 11a As shown, the first rib 1111a and the second rib 1111b can also be set at intervals.

[0119] In some embodiments, such as Figure 11d As shown, the rib 1111 includes a third rib 1111c, which extends in a ring shape along the circumference of the base plate 11 to ensure stable support of the battery cell 3.

[0120] It should be noted that the term "ring" in this application is interpreted broadly, meaning it is not limited to a "circular ring," but can also include, for example, a "polygonal ring," etc. Furthermore, "ring" defines the extension trend of the third rib 1111c; the third rib 1111c can extend continuously or intermittently. In addition, "ring" also includes open rings 10a (e.g., C-shaped structures) and closed rings. It is understood that there can be one or more third ribs 1111c; when there are multiple third ribs 1111c, the arrangement of the multiple third ribs 1111c can be specifically set according to actual needs.

[0121] In some embodiments, there are multiple third ribs 1111c, and the multiple third ribs 1111c are coaxially arranged, that is, the central axes of the multiple annular structures corresponding to the multiple third ribs 1111c coincide. In this case, one of two adjacent third ribs 1111c is sleeved on the radially outer side of the other third rib 1111c, so as to further ensure stable support for the battery cell 3. Of course, the arrangement of the multiple third ribs 1111c can also be set such that the entire annular structure corresponding to the multiple third ribs 1111c is arranged sequentially along a preset direction, such as... Figure 11f As shown.

[0122] In some embodiments, the plurality of ribs 1111 includes a first rib 1111a, a second rib 1111b, and a third rib 1111c.

[0123] In some embodiments, the rib 1111 extends continuously (e.g. Figure 11a , Figure 11b and Figure 11d (as shown) or intermittent extension (such as) Figure 11c and Figure 11e (as shown), so as to further flexibly adjust the support area of ​​the support protrusion 111.

[0124] In some embodiments, the support protrusion 111 is formed as a solid protrusion, and the support protrusion 111 is formed as a circular structure, or an elliptical structure, or a polygonal structure (e.g., Figure 11g (as shown), etc., to ensure that the support protrusion 111 provides stable support for the battery cell 3.

[0125] In some embodiments, such as Figures 7a-7k As shown, at least one of the first surface 11b and the second surface 11c is configured to abut against the battery cell 3. At least one of the first surface 11b and the second surface 11c is adapted to directly contact the battery cell 3 or indirectly abut against it through other components (e.g., the insulating film 4 on the surface of the battery cell 3).

[0126] In some embodiments, such as Figure 12As shown, at least one of the first surface 11b and the second surface 11c has a receiving tank 11d for containing electrolyte. When the battery cell 3 is placed on top of one of the first surface 11b and the second surface 11c, at least the wall of the receiving tank 11d is spaced apart from the battery cell 3. The electrolyte is contained in the receiving tank 11d, allowing the electrolyte in the receiving tank 11d to wet the bottom of the battery cell 3, ensuring a good wetting effect. It is understood that the depth, shape, number, and arrangement of the receiving tank 11d can be specifically set according to actual needs to ensure the wetting effect of the electrolyte on the bottom of the battery cell 3.

[0127] In some embodiments, such as Figure 12 As shown, at least one of the first surface 11b and the second surface 11c is configured to abut against the battery cell 3. At least one of the first surface 11b and the second surface 11c forms a receiving tank 11d for containing electrolyte. At least one of the first surface 11b and the second surface 11c is adapted to directly contact the battery cell 3 or indirectly abut against it through other components (such as the insulating film 4 on the surface of the battery cell 3), so that at least one of the first surface 11b and the second surface 11c applies a certain supporting force to the battery cell 3 to ensure that the battery cell 3 is stably positioned. Moreover, when the battery cell 3 is placed on at least one of the first surface 11b and the second surface 11c, the wall of the receiving tank 11d is spaced apart from the battery cell 3, and the electrolyte is contained in the receiving tank 11d, so that the electrolyte in the receiving tank 11d can wet the bottom of the battery cell 3, ensuring the wetting effect of the battery cell 3.

[0128] For example, in Figure 4 and Figure 12 In the example, the insulating film 4 includes a first insulating portion 41 and a second insulating portion 42. The second insulating portion 42 abuts between the battery cell 3 and the base plate 11, and the first insulating portion 41 is disposed between the battery cell 3 and the side plate 12. The insulating film 4 can be a Mylar film.

[0129] It is understandable that one of the first surface 11b and the second surface 11c is not in contact with the battery cell 3. Figures 7c-7f , Figures 7h-7j When the first surface 11b and the second surface 11c are recessed relative to the other, there is a gap between the first surface 11b and the second surface 11c and the cell 3. This gap is also used to accommodate the electrolyte in order to ensure the wetting effect at the bottom of the cell 3.

[0130] In some embodiments, such as Figures 6-9 and Figure 12 As shown, the base plate 11 has an outer wall surface 11e facing away from the receiving cavity 10. The outer wall surface 11e is formed as a plane to simplify the processing steps of the outer wall surface 11e and facilitate the arrangement of the battery 200.

[0131] In some embodiments, such as Figures 13-18 As shown, the housing 1 has a first reference arcuate surface R1 and a reference plane R2. The first reference arcuate surface R1 is tangent to the second inner wall surface 12a and the reference plane R2, respectively. The first surface 11b protrudes from the reference plane R2 to form a support protrusion 111. The bottom plate 11 has an outer wall surface 11e facing away from the receiving cavity 10. The outer wall surface 11e has a first groove 11f. The first groove 11f is arranged opposite to the support protrusion 111. Then, the material of the bottom plate 11 corresponding to the support protrusion 111 can be at least partially derived from the material corresponding to the first groove 11f, so as to improve the material utilization rate of the bottom plate 11.

[0132] In some embodiments, such as Figure 14 and Figure 17 As shown, the depth of the first groove 11f is t, 0 < t ≤ 2 mm, so that the base plate 11 still has a suitable thickness after the first groove 11f is set; and / or, the height h of the support protrusion 111 protruding from the reference plane R2 is equal to the depth t of the first groove 11f, which also helps to ensure that the base plate 11 still has a suitable thickness after the first groove 11f is set.

[0133] Optionally, the depth of the first groove 11f can be 0.1mm, 0.8mm, 1mm, 1.5mm, 1.7mm, or 2mm, etc.

[0134] In some embodiments, such as Figures 20-23 As shown, the base plate 11 has an outer wall surface 11e facing away from the receiving cavity 10. Reinforcing ribs 112 are formed on the outer wall surface 11e to improve the structural strength of the base plate 11 and reduce its deformation. This reduces the deformation of the bottom of the housing 1, preventing excessive deformation from causing the bottom of the housing 1 to detach from the module pack interface and leading to safety issues, thus ensuring the safety of the battery 200. The reinforcing ribs 112 can be one or more. When there are multiple reinforcing ribs 112, their arrangement can be tailored to the specific application, such as spaced intervals or at least two intersecting.

[0135] It is understandable that when the outer wall surface 11e is formed as a plane, the reinforcing rib 112 can be provided on the aforementioned plane, and the reinforcing rib 112 protrudes from the aforementioned plane; when the outer wall surface 11e is formed with a first groove 11f, such as Figure 21As shown, the reinforcing rib 112 can be provided on the side wall of the first groove 11f facing the receiving cavity 10 (i.e., the bottom wall of the first groove 11f), and the reinforcing rib 112 protrudes from the aforementioned wall surface of the first groove 11f. This facilitates saving the space occupied by the housing 1, so as to improve the space utilization rate of the battery 200. Of course, the reinforcing rib 112 can also be provided on the outside of the first groove 11f.

[0136] In some embodiments, such as Figure 23 As shown, the reinforcing rib 112 is elongated, which facilitates its arrangement. It can be understood that when the outer wall surface 11e has a first groove 11f, the length of the reinforcing rib 112 can be less than or equal to the length of the first groove 11f.

[0137] Of course, in other embodiments, if the extending direction of the reinforcing rib 112 intersects the length direction of the base plate 11 at a non-zero angle, then the extending direction of the reinforcing rib 112 intersects the length direction of the base plate 11 at an acute angle or a right angle (for example, the extending direction of the reinforcing rib 112 is the width direction of the base plate 11). For example, in Figure 22 In the example, the reinforcing rib 112 extends along the width direction of the base plate 11; if the outer wall surface 11e has a first groove 11f, the length of the reinforcing rib 112 can be less than or equal to the width of the first groove 11f. It should be noted that the reinforcing rib 112 can be extended in a straight line or a curved shape.

[0138] In some embodiments, such as Figure 21 As shown, if the height h1 of the reinforcing rib 112 is less than or equal to the depth t of the first groove 11f, then the reinforcing rib 112 is not set to protrude from the outer wall surface 11e, so as to save the space occupied by the housing 1.

[0139] In some embodiments, such as Figure 21 As shown, the first inner wall surface 11a also has a second groove 11g formed therein. Along the thickness direction of the base plate 11, the second groove 11g is disposed opposite to the reinforcing rib 112. Thus, a portion of the material of the base plate 11 corresponding to the reinforcing rib 112 can at least partially originate from the portion of material corresponding to the second groove 11g, thereby improving the material utilization rate of the base plate 11. Of course, the first inner wall surface 11a may also not have the second groove 11g formed therein.

[0140] In some embodiments, such as Figures 5-23 As shown, the base plate 11 is an integral stamped part, which facilitates the processing and forming of the base plate 11.

[0141] For example, the first inner wall surface 11a has a support protrusion 111, and the outer wall surface 11e of the base plate 11 has a first groove 11f. The first groove 11f and the support protrusion 111 are directly opposite each other. At this time, the first groove 11f and the support protrusion 111 can be formed simultaneously by a stamping process, that is, the stamping equipment is aligned with the setting position of the first groove 11f and stamping to form the first groove 11f and the support protrusion 111 at the same time.

[0142] For example, a second groove 11g is formed on the first inner wall surface 11a, and a reinforcing rib 112 is formed on the outer wall surface 11e. The second groove 11g and the reinforcing rib 112 are arranged opposite each other. At this time, the second groove 11g and the reinforcing rib 112 can be formed simultaneously by a stamping process. That is, the stamping equipment is aligned with the setting position of the second groove 11g and stamps to form the second groove 11g and the reinforcing rib 112 at the same time.

[0143] In some embodiments, such as Figures 24a-24j As shown, the battery cell 100 also includes a battery cell 3, which is housed in the receiving cavity 10 of the housing 1. The battery cell 3 has a bottom wall 311, a side wall 312, and a connecting wall 313. The connecting wall 313 connects the bottom wall 311 and the side wall 312 and extends along the length direction of the transition fillet 13. The battery cell 3 also has a second reference arc-shaped surface R3, which is tangent to the bottom wall 311 and the side wall 312 respectively. The connecting wall 313 is located radially inside the second reference arc-shaped surface R3. The double cooperation between the connecting wall 313 and the clearance groove 1a on the housing 1 further increases the distance between the corner of the battery cell 3 and the inner wall of the housing 1, ensuring that the corner of the battery cell 3 will not be damaged by the inner wall of the housing 1, which is conducive to further improving the reliability and safety of the battery cell 3.

[0144] It is understandable that the dimensions of the connecting wall 313 can be adaptively adjusted according to the radius of the second reference arcuate surface R3. For example, in Figures 24a-24j In the example, the connecting wall 313 has a third end connected to the bottom wall 311 and a fourth end connected to the side wall 312. The second reference arcuate surface R3 is tangent to the bottom wall 311 at a first preset position, and the second reference arcuate surface R3 is tangent to the side wall 312 at a second preset position. The third end is located at the first preset position or on the side away from the second reference arcuate surface R3 at the first preset position, and the fourth end is located at the second preset position or on the side away from the second reference arcuate surface R3 at the second preset position.

[0145] Optionally, the cell 3 having the aforementioned connecting wall 313 can be a laminated cell, but is not limited thereto.

[0146] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A housing for accommodating a battery cell, wherein, The housing includes a base plate, side plates, and a transition fillet. The side plates are connected to the outer edge of the base plate, and the transition fillet transitions between the base plate and the side plates. The transition fillet, the side plates, and the base plate define a receiving cavity for accommodating a battery cell. A top cover is provided on the housing, and the top cover is sealed to the housing. The base plate has a first inner wall surface facing the receiving cavity, the first inner wall surface including a first surface and a second surface, the second surface being disposed on the outer peripheral side of the first surface; the side plate has a second inner wall surface facing the receiving cavity; the transition fillet has a third inner wall surface facing the receiving cavity, the third inner wall surface connecting the second surface and the second inner wall surface. Wherein, at least one of the second surface and the third inner wall surface is formed with a clearance groove, and the clearance groove is configured to avoid the corner portion of the battery cell; The housing has a first reference arcuate surface and a reference plane, wherein the first reference arcuate surface is tangent to the second inner wall surface and the reference plane, respectively. The third inner wall surface is recessed relative to the first reference arcuate surface, so that the third inner wall surface forms the avoidance groove.

2. The housing according to claim 1, wherein, Both the first surface and the second surface are coplanar with the reference plane; or, At least one of the first surface and the second surface protrudes from the reference plane to form a support protrusion.

3. The housing according to claim 2, wherein, The projected area of ​​the support protrusion on the plane perpendicular to the thickness direction of the base plate is s1, and the projected area of ​​the base plate on the plane perpendicular to the thickness direction of the base plate is s, where 0.1≤s1 / s≤0.

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4. The housing according to claim 1, wherein, At least one of the first surface and the second surface protrudes from the reference plane to form a support protrusion, the support protrusion protruding from the reference plane at a height h, 0.1 mm ≤ h ≤ 2.0 mm.

5. The housing according to claim 2, wherein, The supporting protrusion includes at least one rib, which extends in a long strip along a straight line or curve.

6. The housing according to claim 5, wherein, The ribs are multiple, including at least one first rib and at least one second rib. The first rib extends in a long strip along a first direction, and the second rib extends in a long strip along a second direction. The first direction and the second direction intersect.

7. The housing according to claim 5, wherein, The rib includes a third rib, which extends in a ring shape along the circumference of the base plate.

8. The housing according to claim 7, wherein, There are multiple third ribs, and the multiple third ribs are coaxially arranged.

9. The housing according to claim 5, wherein, The ribs may extend continuously or intermittently.

10. The housing according to claim 2, wherein, The support protrusion is formed as a solid protrusion, and the support protrusion is formed as a circular structure, an elliptical structure, or a polygonal structure.

11. The housing according to any one of claims 1-10, wherein, At least one of the first surface and the second surface is configured to abut against the battery cell; and / or, at least one of the first surface and the second surface is formed with a receiving tank for containing electrolyte.

12. The housing according to any one of claims 1-10, wherein, The base plate has an outer wall surface facing away from the receiving cavity, and the outer wall surface is formed as a plane.

13. The housing according to any one of claims 1-10, wherein, The housing has a first reference arcuate surface and a reference plane. The first reference arcuate surface is tangent to the second inner wall surface and the reference plane, respectively. The first surface protrudes from the reference plane to form a support protrusion. The bottom plate has an outer wall surface facing away from the receiving cavity. The outer wall surface has a first groove formed therein. The first groove is disposed opposite to the support protrusion.

14. The housing according to claim 13, wherein, The depth of the first groove is t, 0 < t ≤ 2 mm; and / or, The height of the support protrusion protruding from the reference plane is equal to the depth of the first groove.

15. The housing according to any one of claims 1-10, wherein, The base plate has an outer wall surface facing away from the receiving cavity, and the outer wall surface is formed with at least one reinforcing rib.

16. The housing according to claim 15, wherein, The reinforcing rib is elongated.

17. The housing according to claim 15, wherein, The outer wall surface has a first groove, and the reinforcing rib is formed on the bottom wall of the first groove.

18. The housing according to claim 17, wherein, The height of the reinforcing rib is less than or equal to the depth of the first groove.

19. The housing according to claim 17, wherein, The first inner wall surface is also formed with a second groove, which is disposed opposite to the reinforcing rib along the thickness direction of the bottom plate.

20. The housing according to claim 1, wherein, The base plate is a one-piece stamped part.

21. A battery cell, wherein, The housing includes any one of claims 1-20.

22. The battery cell according to claim 21, wherein, It also includes a battery cell, which is housed within the receiving cavity of the housing. The battery cell has a bottom wall, a side wall, and a connecting wall. The connecting wall connects the bottom wall and the side wall and extends along the length direction of the transition fillet. The battery cell also has a second reference arcuate surface, which is tangent to the bottom wall and the side wall, respectively. The connecting wall is located radially inside the second reference arcuate surface.

23. A battery, wherein, It includes the battery cells described in multiple claims 21 or 22.

24. An electrical appliance, wherein, Includes the battery of claim 23, the battery being used to provide electrical energy.

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