Battery cell, battery, electric device, and insulator

Abstract

The utility model provides a battery monomer, a battery, a power utilization device and an insulating part. The battery cell includes a housing, an electrode assembly, and an insulator. The shell comprises an opening and a bottom wall arranged corresponding to the opening. The electrode assembly is arranged in the shell. The insulating part is arranged in the shell. The insulator is disposed between the housing and the electrode assembly. The insulating part comprises a bottom plate and more than two bottom supporting blocks. The bottom supporting block is arranged on the bottom plate and protrudes out of the bottom plate. The bottom plate and the bottom supporting block are arranged between the electrode assembly and the bottom wall. The bottom supporting block supports the electrode assembly, and a gap is formed between the electrode assembly and the bottom wall. The battery monomer provided by the utility model can effectively reduce the possibility of thermal runaway of the battery monomer.

Description

Technical Field

[0001] The present application relates to the field of batteries, and particularly to a battery cell, a battery, an electrical device, and an insulating member. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development. In the development of battery technology, how to improve the safety of batteries has always been a research direction in battery technology. Summary of the Utility Model

[0003] In view of the above problems, the present application provides a battery cell, a battery, an electrical device, and an insulating member, which can effectively reduce the possibility of thermal runaway of the battery cell.

[0004] On the one hand, an embodiment of the present application provides a battery cell, which includes a housing, an electrode assembly, and an insulating member. The housing includes an opening and a bottom wall corresponding to the opening. The electrode assembly is disposed in the housing. The insulating member is disposed in the housing. The insulating member is disposed between the housing and the electrode assembly. The insulating member includes a bottom plate and more than two bottom support blocks. The bottom support blocks are disposed on the bottom plate and protrude from the bottom plate. Both the bottom plate and the bottom support blocks are disposed between the electrode assembly and the bottom wall. The bottom support blocks support the electrode assembly, and there is a spacing between the electrode assembly and the bottom wall.

[0005] For the battery cell of the embodiment of the present application, the bottom plate and the bottom support blocks on the insulating member can support the electrode assembly after it is installed in the housing to lift the electrode assembly, which is beneficial for the electrode assembly to avoid the rounded corner transition area on the housing. During the assembly process of the electrode assembly and the housing, the rounded corner transition area on the housing is not likely to squeeze the electrode assembly. Or, during the use of the battery cell, when the electrode assembly moves in the housing, the electrode assembly is not likely to collide with the rounded corner transition area on the housing. Therefore, in the battery cell of the embodiment of the present application, the electrode assembly is not likely to come into contact with the rounded corner transition area of the housing, effectively reducing the possibility that the rounded corner transition area of the housing squeezes the electrode assembly and causes local deformation of the electrode assembly, and reducing the possibility that the positive electrode plate and the negative electrode plate are short-circuited and cause thermal runaway of the battery cell.

[0006] In some feasible ways, along the thickness direction of the bottom plate, the orthographic projection of the bottom support block is located within the orthographic projection of the bottom plate.

[0007] When the insulating member is installed in the housing, the bottom support blocks are not likely to interfere with the position of the housing, ensuring that the insulating member can be smoothly installed in the housing, which is beneficial for improving the working efficiency and operation difficulty of assembling the insulating member and the housing.

[0008] In some feasible ways, the outer edge of the bottom support block coincides with the outer edge of the bottom plate.

[0009] The bottom support block can improve the mechanical strength at the edge of the bottom plate, which is beneficial to reducing the possibility that the edge of the bottom plate bends due to the resistance of the housing when the insulating part is inserted into the housing, and thus is beneficial to reducing the possibility that the bottom plate is uneven due to the bending of the edge of the bottom plate.

[0010] In some feasible ways, the bottom support block protrudes from the bottom plate towards the electrode assembly.

[0011] The space between two or more bottom support blocks can accommodate the electrolyte. The electrolyte accommodated in the space between two or more bottom support blocks can be in direct contact with the electrode assembly, which is beneficial to improving the wetting effect of the electrolyte on the electrode assembly.

[0012] In some feasible ways, the bottom support block protrudes from the bottom plate towards the bottom wall.

[0013] The bottom support block can support and elevate the bottom plate, which is beneficial to the bottom plate avoiding the rounded corner transition area on the housing. After the electrode assembly, the insulating part and the housing are assembled, the rounded corner transition area on the housing is not likely to squeeze the bottom plate, effectively reducing the possibility that the rounded corner transition area of the housing squeezes the bottom plate and causes local deformation of the bottom plate, and thus reducing the possibility that the local deformation of the bottom plate squeezes the electrode assembly and causes local deformation of the electrode assembly.

[0014] In some feasible ways, the bottom support block protrudes from the bottom plate towards the bottom wall. The bottom support block includes a connecting part and an extending part. The connecting part is connected to the bottom plate, and the extending part extends beyond the outer edge of the bottom plate.

[0015] The bottom support block can support and elevate the bottom plate. At the same time, the way that the extending part extends beyond the bottom plate can effectively increase the distance between the bottom plate and the housing, and the extending part can play a protective role for the bottom plate, which is beneficial to the bottom plate effectively avoiding the rounded corner transition area on the housing. After the electrode assembly, the insulating part and the housing are assembled, the rounded corner transition area on the housing is not likely to squeeze the bottom plate, effectively reducing the possibility that the rounded corner transition area of the housing squeezes the bottom plate and causes local deformation of the bottom plate, and thus reducing the possibility that the local deformation of the bottom plate squeezes the electrode assembly and causes local deformation of the electrode assembly.

[0016] In some feasible ways, the maximum dimension of the extending part extending beyond the outer edge of the bottom plate is D, where 0 mm < D ≤ 1.5 mm.

[0017] When the maximum dimension D of the extension part exceeding the outer edge of the bottom plate is greater than 1.5 mm, the dimension of the extension part exceeding the bottom plate is relatively large, and due to the limitation of the size of the insulating part, the size adaptability of the electrode assembly is reduced, resulting in a relatively low energy density of the battery cell. In the embodiment of the present application, the setting method of the maximum dimension of the extension part exceeding the outer edge of the bottom plate can help solve the above technical problems.

[0018] In some feasible ways, the bottom plate is rectangular, and along the length direction of the bottom plate, more than two bottom support blocks are arranged on the bottom plate.

[0019] More than two bottom support blocks can simultaneously provide a supporting force for the electrode assembly to support the electrode assembly at different positions, realizing multi-point support for the electrode assembly, and improving the force balance and position stability of the electrode assembly.

[0020] In some feasible ways, along the length direction of the bottom plate, the sum of the maximum dimensions of each bottom support block is C1, and the maximum dimension of the electrode assembly is C2, where 1 / 5 ≤ C1 / C2 ≤ 2 / 3.

[0021] When C1 / C2 is less than 1 / 5, the total area of each supporting area of each bottom support block for the electrode assembly is relatively small, making the total area of the suspended area below the electrode assembly relatively large, which is not conducive to the force balance and position stability of the electrode assembly. When C1 / C2 is greater than 2 / 3, the total area of each supporting area of each bottom support block for the electrode assembly is relatively large, but the distance between each bottom support block in the length direction of the bottom plate is relatively small. On the one hand, it is not conducive to the air flow between each bottom support block, increasing the air flow resistance between each bottom support block. On the other hand, it is not conducive to accommodating more electrolyte in the space between each bottom support block. The embodiment of the present application selects the above value range, which is conducive to solving the above technical problems.

[0022] In some feasible ways, the bottom support block protrudes from the bottom plate towards the bottom wall, and the housing further includes an inner side wall, and there is a fillet transition between the bottom wall and the inner side wall, and the surface shape of the bottom support block facing the fillet matches the shape of the fillet.

[0023] The surface shape of the bottom support block facing the fillet of the housing matches the shape of the fillet of the housing. A fillet transition is also provided on the bottom support block arranged at the edge of the bottom plate, so that the bottom support block can fit with the fillet of the housing, which is beneficial to the accurate positioning of the insulating part in the housing, reducing the possibility of deformation of the insulating part caused by inaccurate positioning after the insulating part is installed in the housing. At the same time, in the case of vibration of the battery cell, it is beneficial to ensure that the position of the bottom support block is not easily offset relative to the electrode assembly.

[0024] In some feasible ways, the bottom plate is rectangular, and along the width direction of the bottom plate, more than two bottom support blocks are arranged on the bottom plate.

[0025] Two or more base support blocks can simultaneously provide a supporting force to the electrode assembly to support the electrode assembly at different positions, achieving multi-point support for the electrode assembly and improving the force balance and position stability of the electrode assembly.

[0026] In some implementable ways, the number of electrode assemblies is one. Along the width direction of the bottom plate, the sum of the maximum dimensions of each base support block is K1, and the maximum dimension of the electrode assembly is K2, where 1 / 4 ≤ K1 / K2 < 1.

[0027] When K1 / K2 is less than 1 / 4, the total area of each supporting area of each base support block for the electrode assembly is relatively small, resulting in a relatively large total area of the suspended area below the electrode assembly, which is not conducive to the force balance and position stability of the electrode assembly. When K1 / K2 is equal to 1, the total area of each supporting area of each base support block for the electrode assembly is relatively large, but there is no spacing between each base support block in the width direction of the bottom plate, so that no space for air flow or electrolyte accommodation can be formed between each base support block. The embodiments of the present application select the above value range, which is beneficial to solving the above technical problems.

[0028] In some implementable ways, the number of electrode assemblies is two or more, and two or more electrode assemblies are arranged side by side along the width direction of the bottom plate. Along the width direction of the bottom plate, the sum of the maximum dimensions of each base support block is K1, and the sum of the maximum dimensions of each electrode assembly is K3, where 1 / 4 ≤ K1 / K3 < 1.

[0029] When K1 / K3 is less than 1 / 4, the total area of each supporting area of each base support block for the electrode assembly is relatively small, resulting in a relatively large total area of the suspended area below each electrode assembly, which is not conducive to the force balance and position stability of the electrode assembly. When K1 / K3 is equal to 1, the total area of each supporting area of each base support block for each electrode assembly is relatively large, but there is no spacing between each base support block in the width direction of the bottom plate, so that no space for air flow or electrolyte accommodation can be formed between each base support block. The embodiments of the present application select the above value range, which is beneficial to solving the above technical problems.

[0030] In some implementable ways, the bottom plate is rectangular, the number of electrode assemblies is two or more, and each electrode assembly is arranged side by side along the width direction of the bottom plate, and each electrode assembly is supported by a corresponding base support block.

[0031] Each electrode assembly is supported by a corresponding base support block. Each electrode assembly is supported by a base support block, so that any electrode assembly will not be in a suspended state, reducing the possibility of structural deformation of the electrode assembly in the suspended area due to the loss of support when the electrode assembly is in a suspended state.

[0032] In some feasible embodiments, the bottom plate is rectangular, and bottom support blocks are respectively arranged at the four top corners of the bottom plate.

[0033] The four bottom support blocks can form support points at four different positions of the electrode assembly, which is beneficial to ensuring the position stability of the electrode assembly. The number of bottom support blocks is relatively small, which is beneficial to reducing the weight of the insulating part while meeting the requirement of supporting the electrode assembly, thus being beneficial to improving the energy density of the battery cell.

[0034] In some feasible embodiments, the housing further includes an inner side wall, and there is a rounded transition between the bottom wall and the inner side wall. The distance between the electrode assembly and the bottom wall is greater than or equal to the radius of the rounded corner.

[0035] The bottom support blocks and the bottom plate can support and elevate the electrode assembly, so that the electrode assembly can avoid the rounded corners on the housing, effectively reducing the possibility of contact between the electrode assembly and the rounded corners on the housing.

[0036] In some feasible embodiments, the battery cell further includes an end cap, the end cap is connected to the housing, the end cap covers the opening of the housing, and the insulating part is connected to the end cap.

[0037] The way of connecting the insulating part to the end cap, on the one hand, can ensure that the insulating part covering the outside of the electrode assembly is not prone to looseness and dispersion, thus being beneficial to improving the convenience of the subsequent process of installing the electrode assembly and the insulating part into the housing and improving the assembly efficiency. On the other hand, it can ensure that after the insulating part is installed into the housing, the position of the insulating part itself is not prone to deviation and the structure is not prone to deformation, ensuring that the position accuracy of the insulating part after being installed into the housing meets the requirements.

[0038] In some feasible embodiments, the housing further includes an inner side wall, the insulating part includes a side plate, the bottom plate is connected to the side plate, and the side plate is located between the electrode assembly and the inner side wall.

[0039] The side plate of the insulating part can isolate the electrode assembly from the inner side wall of the housing, which is beneficial to further improving the insulation isolation effect of the insulating part on the electrode assembly.

[0040] In some feasible embodiments, the bottom plate and the bottom support blocks are of an integrally formed structure.

[0041] Using a blank to directly process and form the bottom plate and the bottom support blocks simultaneously, thus on the one hand, the connection process between the bottom plate and the bottom support blocks can be omitted, simplifying the production process and improving the production efficiency. On the other hand, it is beneficial to improving the connection strength between the bottom plate and the bottom support blocks, effectively reducing the possibility of separation between the bottom support blocks and the bottom plate.

[0042] On the other hand, the embodiments of the present application provide a battery, which includes the battery cell.

[0043] On the other hand, an embodiment of the present application provides an electrical device, which includes a battery. The battery is used to provide electrical energy.

[0044] In yet another aspect, an embodiment of the present application provides an insulating member for a battery cell. The insulating member includes a bottom plate and more than two bottom support blocks. The bottom support blocks are connected to the bottom plate, and along the thickness direction of the bottom plate, the bottom support blocks protrude from the bottom plate.

[0045] In some implementable ways, the insulating member further includes side plates. The two opposite sides of the bottom plate are respectively connected to the side plates. The side plates on one side of the bottom plate are symmetrically arranged relative to the bottom plate with respect to the side plates on the other side. The side plates are foldable relative to the bottom plate. When the side plates are in the turned-up state, the side plates and the bottom plate enclose a receiving space. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0047] Figure 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

[0048] Figure 2 is a schematic structural diagram of a battery provided by an embodiment of the present application;

[0049] Figure 3 is a schematic structural diagram of a battery module provided by an embodiment of the application;

[0050] Figure 4 is an exploded structural diagram of a battery cell provided by an embodiment of the present application;

[0051] Figure 5 is a partial structural diagram of a battery cell provided by an embodiment of the present application;

[0052] Figure 6 is a partial sectional structural diagram of a housing provided by an embodiment of the present application;

[0053] Figure 7 is a partial sectional structural diagram of a battery cell provided by an embodiment of the present application;

[0054] Figure 8 is a partial structural diagram of an insulating member provided by an embodiment of the present application;

[0055] Figure 9 is a partial structural diagram of the insulating member and the electrode assembly in a state to be assembled provided by an embodiment of the present application;

[0056] Figure 10 It is a partial structural schematic diagram of an insulating part provided by an embodiment of the present application;

[0057] Figure 11 It is a partial structural schematic diagram of the assembled state of an insulating part and an electrode assembly provided by an embodiment of the present application;

[0058] Figure 12 It is a partial sectional structural schematic diagram of a battery cell provided by an embodiment of the present application;

[0059] Figure 13 It is a partial sectional structural schematic diagram of an insulating part provided by an embodiment of the present application;

[0060] Figure 14 It is a partial structural schematic diagram of a battery cell provided by an embodiment of the present application;

[0061] Figure 15 It is a partial sectional structural schematic diagram of a battery cell provided by an embodiment of the present application;

[0062] Figure 16 It is a partial sectional structural schematic diagram of a battery cell provided by an embodiment of the present application;

[0063] Figure 17 It is a partial sectional structural schematic diagram of a battery cell provided by an embodiment of the present application;

[0064] Figure 18 It is a partial sectional structural schematic diagram of a battery cell provided by an embodiment of the present application;

[0065] Figure 19 It is a partial sectional structural schematic diagram of a battery cell provided by an embodiment of the present application;

[0066] Figure 20 It is a partial sectional structural schematic diagram of a battery cell provided by an embodiment of the present application;

[0067] Figure 21 It is a partial sectional structural schematic diagram of a battery cell provided by an embodiment of the present application.

[0068] Explanation of reference numerals:

[0069] 1. Vehicle; 10. Battery; 11. Controller; 12. Motor; 20. Battery module; 30. Battery cell; 40. End cap; 41. Electrode terminal; 50. Housing; 50a. Opening; 501. Bottom wall; 502. Inner wall; 51. Bottom shell part; 52. Side shell part; 521. First side part; 522. Second side part; 60. Electrode assembly; 601. Large surface; 602. Narrow surface; 70. Insulating part; 71. Bottom plate; 72. Bottom support block; 721. Connecting part; 722. Extending part; 73. Side plate; 100. Box body; 101. First box body part; 102. Second box body part; R. Rounding; X. Length direction; Y. Width direction; Z. Thickness direction. Detailed implementation manners

[0070] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and thus are only examples and should not be used to limit the protection scope of the present application.

[0071] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be the ordinary meanings understood by those skilled in the art to which the embodiments of the present application belong.

[0072] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the embodiments of the present application.

[0073] In addition, the technical terms "first", "second", etc. are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0074] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, technical terms such as "installation", "connection", "linkage", and "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may also be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0075] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher level than the second feature in terms of horizontal height. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower level than the second feature in terms of horizontal height.

[0076] Currently, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric transportation means such as electric bicycles, electric motorcycles, electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also constantly increasing.

[0077] In the present application, the battery cell 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, a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be in the shape of a flat body, a cuboid or other shapes, and the embodiments of the present application also do not limit this.

[0078] 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, etc. The battery generally includes a box body for encapsulating one or more battery cells. The box body can prevent liquids or other foreign matters from affecting the charging or discharging of the battery cells.

[0079] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator. The battery cell mainly operates by the movement of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate 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 includes a positive current collecting portion and a positive tab connected to the positive current collecting portion. The positive current collecting portion is coated with the positive active material layer. The positive tab is not coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum. The positive active material layer includes positive active materials. The positive active materials can be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, etc. The negative electrode plate 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 includes a negative current collecting portion and a negative tab connected to the negative current collecting portion. The negative current collecting portion is coated with the negative active material layer. The negative tab is not coated with the negative active material layer. The material of the negative current collector can be copper. The negative active material layer includes negative active materials. The negative active materials can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0080] The inventor noticed that the housing of the battery cell has a bottom plate and side plates. A rounded corner transition is formed between the bottom plate and the side plates of the housing. The surface of the housing in the rounded corner transition area is a non-planar surface, which can be, for example, an arc surface. The electrode assembly is a structural member manufactured by winding or laminating the positive electrode plate, the negative electrode plate, and the separator. After the electrode assembly is installed in the housing, there is a problem that the rounded corner transition area of the housing squeezes the electrode assembly. When the electrode assembly is squeezed, the electrode assembly will deform in the squeezed area, resulting in a problem that the separator is damaged and the positive electrode plate and the negative electrode plate are short-circuited, or there is a problem that the active material layer peels off and the positive electrode plate and the negative electrode plate are short-circuited. In the case of a short circuit between the positive electrode plate and the negative electrode plate, there is a possibility of thermal runaway of the battery cell.

[0081] In order to alleviate the problem that the rounded corner transition area of the housing squeezes the electrode assembly, the applicant's research found that the electrode assembly can be supported so that the electrode assembly does not contact the rounded corner transition area of the housing. Specifically, a bottom support block is provided between the electrode assembly and the housing, and the electrode assembly is supported by the bottom support block.

[0082] Based on the above considerations, in order to solve the problem of the extrusion of the electrode assembly in the rounded corner transition area of the housing, the inventor has designed a battery cell through in-depth research. In such a battery cell, an insulating member is provided between the housing and the electrode assembly. A bottom support block is provided on the bottom plate of the insulating member. After the electrode assembly is installed in the housing, the bottom support block can support the electrode assembly, so that there is a spacing between the electrode assembly and the bottom wall of the housing, so that the electrode assembly can be prevented from contacting the rounded corner transition area of the housing, effectively reducing the possibility of the rounded corner transition area of the housing squeezing the electrode assembly, and reducing the possibility of thermal runaway of the battery cell caused by a short circuit between the positive electrode plate and the negative electrode plate.

[0083] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using the batteries.

[0084] The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spaceship, etc. The electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, and a planer, etc. The embodiments of the present application do not make special restrictions on the above electrical devices.

[0085] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the batteries and electrical devices described above, but also applicable to all batteries including boxes and electrical devices using the batteries. However, for the sake of simplicity of description, the following embodiments will be described by taking an electric vehicle as an example.

[0086] Figure 1 Schematically shows the structure of a vehicle 1 provided by some embodiments of the present application. Refer to Figure 1 As shown, the vehicle 1 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery 10 is provided inside the vehicle 1. The battery 10 can be provided at the bottom, head, or tail of the vehicle 1. The battery 10 can be used for power supply of the vehicle 1. For example, the battery 10 can be used as the operating power source of the vehicle 1. The vehicle 1 may further include a controller 11 and a motor 12. The controller 11 is used to control the battery 10 to supply power to the motor 12. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1.

[0087] In some embodiments of the present application, the battery 10 can not only serve as the operating power source of the vehicle 1, but also as the driving power source of the vehicle 1, so as to provide driving power for the vehicle 1 instead of or partially replacing fuel or natural gas.

[0088] To meet different power usage requirements, the battery 10 may include a plurality of battery cells. A battery cell refers to the smallest unit that makes up a battery module or a battery pack. The plurality of battery cells can be connected in series and / or in parallel via electrode terminals for various applications. The battery mentioned in the present application includes a battery module or a battery pack. Among them, the plurality of battery cells can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means a combination of series and parallel connections. In the embodiments of the present application, the plurality of battery cells can directly form a battery pack, or can first form a battery module 20, and then the battery module 20 forms a battery pack.

[0089] Figure 2 Schematically shows the structure of the battery 10 according to an embodiment of the present application. Refer to Figure 2 As shown, the battery includes a box body 100 and battery cells (not shown in the figure). The battery cells are accommodated in the box body 100. The box body 100 can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as a cuboid, cylinder, or sphere. The embodiments of the present application do not limit this. The material of the box body 100 can be alloy materials such as aluminum alloy and ferroalloy, or polymer materials such as polycarbonate and polyisocyanurate foam plastic, or composite materials such as glass fiber reinforced epoxy resin. The embodiments of the present application also do not limit this.

[0090] The housing 100 is used to accommodate battery cells, and the housing 100 can have various structures. In some embodiments, the housing 100 may include a first housing portion 101 and a second housing portion 102. The first housing portion 101 and the second housing portion 102 cover each other. The first housing portion 101 and the second housing portion 102 jointly define an accommodation space for accommodating battery cells. The second housing portion 102 can be a hollow structure with one end open. In some embodiments, the first housing portion 101 is a plate-like structure. The first housing portion 101 covers the open side of the second housing portion 102 to form the housing 100 with an accommodation space. In some embodiments, both the first housing portion 101 and the second housing portion 102 can also be hollow structures with one side open. The open side of the first housing portion 101 covers the open side of the second housing portion 102 to form the housing 100 with an accommodation space. Of course, the first housing portion 101 and the second housing portion 102 can have various shapes, such as a cylinder, a cuboid, etc. To improve the sealing performance after the connection between the first housing portion 101 and the second housing portion 102, a sealing member, such as sealant, sealing ring, etc., can also be provided between the first housing portion 101 and the second housing portion 102. In some embodiments, the first housing portion 101 covers the top of the second housing portion 102. The first housing portion 101 can also be referred to as the upper cover, and the second housing portion 102 can also be referred to as the lower housing.

[0091] In a battery, there can be one or multiple battery cells. When there are multiple battery cells, the multiple battery cells can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the multiple battery cells. The multiple battery cells can be directly connected in series, in parallel, or in a series-parallel combination together, and then the whole formed by the multiple battery cells is accommodated in the housing 100. Of course, the multiple battery cells can also be first connected in series, in parallel, or in a series-parallel combination to form battery modules. Multiple battery modules are then connected in series, in parallel, or in a series-parallel combination to form a whole and are accommodated in the housing 100.

[0092] In some embodiments, Figure 3 Schematically shows the structure of a battery module 20 according to an embodiment of the present application. Refer to Figure 3 As shown, there can be multiple battery cells 30. The multiple battery cells 30 are first connected in series, in parallel, or in a series-parallel combination to form the battery module 20. Multiple battery modules 20 are then connected in series, in parallel, or in a series-parallel combination to form a whole and are accommodated in the housing 100.

[0093] The multiple battery cells 30 in the battery module 20 can be electrically connected through a busbar component to achieve the parallel, series, or series-parallel connection of the multiple battery cells 30 in the battery module 20.

[0094] In the embodiments of the present application, the battery cell 30 may include a lithium-ion battery cell, a sodium-ion battery cell, a magnesium-ion battery cell, etc., and the embodiments of the present application are not limited thereto. The battery cell 30 may be in the shape of a flat body, a cuboid or other shapes, etc., and the embodiments of the present application are not limited thereto either. However, for the sake of simplicity of description, the following embodiments will be described by taking the cubic square battery cell 30 as an example.

[0095] Figure 4 Schematically shows the exploded structure of the battery cell 30 provided by some embodiments of the present application. The battery cell 30 refers to the smallest unit that makes up the battery. See Figure 4 As shown, the battery cell 30 includes an end cap 40, a housing 50, and an electrode assembly 60. The end cap 40 refers to a component that covers the opening of the housing 50 to isolate the internal environment of the battery cell 30 from the external environment. Exemplarily, the shape of the end cap 40 may be adapted to the shape of the housing 50 to cooperate with the housing 50. Exemplarily, the end cap 40 may be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 40 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 30 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 41 may be provided on the end cap 40. The electrode terminal 41 may be used for electrically connecting with the electrode assembly 60 to output or input the electrical energy of the battery cell 30.

[0096] In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 30 reaches a threshold may also be provided on the end cap 40. The material of the end cap 40 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions thereon. In some embodiments, an insulating component may also be provided on the inner side of the end cap 40, and the insulating component may be used to isolate the electrical connection components in the housing 50 from the end cap 40 to reduce the risk of short circuit. Exemplarily, the insulating component may be plastic, rubber, etc.

[0097] The shell 50 is a component used to cooperate with the end cap 40 to form the internal environment of the battery cell 30. Among them, the internal environment formed can be used to accommodate the electrode assembly 60, the electrolyte (not shown in the figure) and other components. The shell 50 and the end cap 40 can be independent components. An opening can be set on the shell 50, and the internal environment of the battery cell 30 is formed by covering the opening with the end cap 40 at the opening. Without limitation, the end cap 40 and the shell 50 can also be integrated. Specifically, the end cap 40 and the shell 50 can form a common connection surface before other components are put into the shell. When it is necessary to encapsulate the interior of the shell 50, the end cap 40 is covered with the shell 50. The shell 50 can be of various shapes and sizes, such as a rectangular parallelepiped, a hexagonal prism, etc. Specifically, the shape of the shell 50 can be determined according to the specific shape and size of the electrode assembly 60. The material of the shell 50 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0098] The electrode assembly 60 is a component in the battery cell 30 where an electrochemical reaction occurs. One or more electrode assemblies 60 may be included in the housing 50. The electrode assembly 60 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly. The parts of the positive and negative electrode sheets without active materials each constitute a tab (not shown in the figure). The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminals 41 to form a current loop.

[0099] Figure 5 The partial structure of a battery cell 30 provided in some embodiments of the present application is schematically shown. Figure 6 The partial cross-sectional structure of the housing 50 provided in some embodiments of the present application is schematically shown. Figure 7 The partial cross-sectional structure of the battery cell 30 provided in some embodiments of the present application is schematically shown. Figure 5 , Figure 6 and Figure 7As shown, the battery cell 30 includes a housing 50, an electrode assembly 60, and an insulating member 70. The housing 50 includes an opening 50a and a bottom wall 501 corresponding to the opening 50a. The electrode assembly 60 is disposed within the housing 50. The insulating member 70 is disposed within the housing 50. The insulating member 70 is disposed between the housing 50 and the electrode assembly 60. The insulating member 70 includes a bottom plate 71 and more than two bottom support blocks 72. The bottom support blocks 72 are disposed on the bottom plate 71 and protrude from the bottom plate 71. Both the bottom plate 71 and the bottom support blocks 72 are disposed between the electrode assembly 60 and the bottom wall 501. The bottom support blocks 72 support the electrode assembly 60. There is a gap between the electrode assembly 60 and the bottom wall 501.

[0100] The housing 50 has a receiving cavity. The electrode assembly 60 can be inserted into the receiving cavity of the housing 50 through the opening 50a of the housing 50. The receiving cavity of the housing 50 in the embodiment of the present application can be a blind hole structure, that is, one end of the housing 50 is provided with an opening 50a. The housing 50 has a bottom wall 501. Along the depth direction of the receiving cavity, the opening 50a of the housing 50 is correspondingly disposed opposite to the bottom wall 501. In some embodiments, refer to Figure 6 and Figure 7 As shown, the housing 50 may include a bottom housing portion 51 and a side housing portion 52. The bottom housing portion 51 and the side housing portion 52 are transitioned by a fillet R. Along the depth direction of the receiving cavity, the opening 50a of the housing 50 is correspondingly disposed opposite to the bottom housing portion 51. The bottom housing portion 51 has a bottom wall 501 facing the receiving cavity. The side housing portion 52 has an inner side wall 502 facing the receiving cavity.

[0101] When the electrode assembly 60 is assembled with the housing 50, the electrode assembly 60 can be inserted into the housing 50 through the opening 50a of the housing 50. Before the electrode assembly 60 is inserted into the housing 50, the electrode assembly 60 is coated with the insulating member 70. After the electrode assembly 60 and the insulating member 70 are inserted into the housing 50 together, the insulating member 70 can be located between the housing 50 and the electrode assembly 60 to isolate the housing 50 and the electrode assembly 60. In some embodiments, the material of the insulating member 70 may include, but is not limited to, polypropylene (PP) or polyethylene (PE).

[0102] In the insulating member 70 of the embodiment of the present application, more than two bottom support blocks 72 are disposed on the bottom plate 71. The more than two bottom support blocks 72 are spaced apart. The bottom support blocks 72 protrude from the bottom plate 71, so that the thickness of the insulating member 70 at the bottom support blocks 72 can be greater than the thickness of other regions of the bottom plate 71. The top surface of the bottom support blocks 72 is not coplanar with the surface of the bottom plate 71. A stepped structure is formed between the bottom support blocks 72 and the bottom plate 71.

[0103] After the electrode assembly 60, the insulating member 70, and the housing 50 are assembled, both the bottom plate 71 and the bottom supporting block 72 of the insulating member 70 are disposed between the electrode assembly 60 and the bottom wall 501 of the housing 50. The bottom plate 71 of the insulating member 70 is correspondingly disposed with the bottom wall 501 of the housing 50. Since the bottom supporting block 72 protrudes from the bottom plate 71, the insulating member 70 can support the electrode assembly 60 through the bottom supporting block 72 to lift the electrode assembly 60, so that there is a gap between the electrode assembly 60 and the bottom wall 501 of the housing 50.

[0104] In some embodiments, the insulating member 70 and the bottom wall 501 of the housing 50 may be in direct contact.

[0105] In the battery cell 30 of the embodiment of the present application, the bottom plate 71 and the bottom supporting block 72 on the insulating member 70 can support the electrode assembly 60 after it is installed in the housing 50 to lift the electrode assembly 60, which is beneficial for the electrode assembly 60 to avoid the rounded corner R transition area on the housing 50. During the assembly process of the electrode assembly 60 and the housing 50, the rounded corner R transition area on the housing 50 is not likely to squeeze the electrode assembly 60. Or, during the use of the battery cell 30, when the electrode assembly 60 moves in the housing 50, the electrode assembly 60 is not likely to collide with the rounded corner R transition area on the housing 50. Therefore, in the battery cell 30 of the embodiment of the present application, the electrode assembly 60 is not likely to come into contact with the rounded corner R transition area of the housing 50, effectively reducing the possibility that the rounded corner R transition area of the housing 50 squeezes the electrode assembly 60 and causes local deformation of the electrode assembly 60, and reducing the possibility that the positive and negative electrode plates are short-circuited and the battery cell 30 undergoes thermal runaway.

[0106] In the battery cell 30 of the embodiment of the present application, the space between two or more bottom supporting blocks 72 can form a channel. Thus, in the case of thermal runaway of the electrode assembly 60 in the battery cell 30, the space between two or more bottom supporting blocks 72 can form an exhaust channel, enabling gas to flow and relieve pressure from the bottom of the housing 50 to the pressure relief mechanism on the end cover 40 faster and more easily, which is beneficial for reducing the severity of thermal runaway.

[0107] In the battery cell 30 of the embodiment of the present application, the space between two or more bottom supporting blocks 72 can be used to hold more electrolyte. The electrolyte in the battery cell 30 will be continuously consumed during charge and discharge cycles. The battery cell 30 of the embodiment of the present application can hold more electrolyte, which is beneficial for extending the service life of the battery cell 30.

[0108] In the battery cell 30 according to the embodiment of the present application, two or more bottom support blocks 72 are provided on the bottom plate 71 of the insulating member 70, which can support and elevate the electrode assembly 60, so that there is no need to provide a whole support plate with an area equivalent to that of the bottom wall 501 of the housing 50, which is beneficial to reducing the weight of the insulating member 70 itself, thereby reducing the weight of the battery cell 30 and being beneficial to improving the energy density of the battery cell 30.

[0109] In some realizable ways, along the thickness direction Z of the bottom plate 71, the orthographic projection of the bottom support block 72 is located within the orthographic projection of the bottom plate 71. The thickness direction Z of the bottom plate 71 can be the same as the depth direction of the accommodating cavity of the housing 50. In the direction perpendicular to the thickness direction Z of the bottom plate 71, the bottom support block 72 does not protrude beyond the bottom plate 71. When the insulating member 70 is inserted into the housing 50, the bottom support block 72 is not likely to interfere with the position of the housing 50, ensuring that the insulating member 70 can be smoothly inserted into the housing 50, which is beneficial to improving the working efficiency and operation difficulty of assembling the insulating member 70 and the housing 50.

[0110] In some examples, the outer edge of the bottom support block 72 coincides with the outer edge of the bottom plate 71. There is no step structure formed between the outer edge of the bottom support block 72 and the outer edge of the bottom plate 71. Along the thickness direction Z of the bottom plate 71, the outer edge of the orthographic projection of the bottom support block 72 coincides with the outer edge of the orthographic projection of the bottom plate 71.

[0111] The bottom support block 72 can improve the mechanical strength at the edge of the bottom plate 71, which is beneficial to reducing the possibility that the edge of the bottom plate 71 is bent by the resistance of the housing 50 when the insulating member 70 is inserted into the housing 50, and thus is beneficial to reducing the possibility that the bottom plate 71 is uneven due to the bending of the edge of the bottom plate 71.

[0112] Exemplarily, the bottom support block 72 and the bottom plate 71 can be connected by a hot melt process. After pre-positioning the bottom support block 72 and the bottom plate 71, the bottom support block 72 and the bottom plate 71 are connected by a hot melt process. The way that the outer edge of the bottom support block 72 coincides with the outer edge of the bottom plate 71 is beneficial to quickly and accurately pre-position the bottom support block 72 and the bottom plate 71 and reduce the difficulty of pre-positioning between the bottom support block 72 and the bottom plate 71.

[0113] In some realizable ways, Figure 8 Schematically shows a partial structure of the insulating member 70 provided by some embodiments of the present application. Refer to Figure 7 and Figure 8As shown, the bottom support block 72 of the insulating member 70 protrudes from the bottom plate 71 of the insulating member 70 towards the electrode assembly 60. Along the thickness direction Z of the bottom plate 71, the bottom support block 72 is located between the bottom plate 71 and the electrode assembly 60. The bottom plate 71 of the insulating member 70 can be in contact with the bottom wall 501 of the housing 50. The bottom support block 72 is provided on the side of the bottom plate 71 facing away from the bottom wall 501 of the housing 50. The bottom support block 72 can be in contact with the electrode assembly 60.

[0114] The space between two or more bottom support blocks 72 can accommodate the electrolyte. The electrolyte accommodated in the space between two or more bottom support blocks 72 can be in direct contact with the electrode assembly 60, which is beneficial to improving the wetting effect of the electrolyte on the electrode assembly 60.

[0115] In some examples, Figure 9 Schematically shows a partial structure of the insulating member 70 and the electrode assembly 60 in a state to be assembled provided by some embodiments of the present application. Refer to Figure 8 and Figure 9 As shown, the insulating member 70 includes a side plate 73. The bottom plate 71 and the side plate 73 are connected. The side plate 73 is located between the electrode assembly 60 and the inner side wall 502 of the housing 50. The outer edge of the bottom support block 72 coincides with the outer edge of the bottom plate 71, so that the side plate 73 can abut against the bottom support block 72, and the bottom support block 72 will not apply local concentrated stress to the side plate 73 to cause the side plate 73 to bend and deform. In addition, when using the insulating member 70 to cover the electrode assembly 60, the side plate 73 needs to be folded relative to the bottom plate 71. An accommodation space for accommodating the electrode assembly 60 is formed between the bottom plate 71 and the side plate 73 after the folding is completed. When the side plate 73 is turned up relative to the bottom plate 71, the bottom support block 72 can play a positioning role for the side plate 73, so that the side plate 73 can be relatively easily turned over to a predetermined position. For example, when the side plate 73 is turned over to a position perpendicular to the bottom plate 71, the side plate 73 is limited by the bottom support block 72 and will no longer turn over, so that the side plate 73 is easy to accurately maintain at the current position perpendicular to the bottom plate 71. Exemplarily, the outer side surface of the bottom plate 71 and the outer side surface of the bottom support block 72 can both be planes. The outer side surface of the bottom plate 71 and the outer side surface of the bottom support block 72 are coplanar.

[0116] In some realizable ways, Figure 10 Schematically shows a partial structure of the insulating member 70 provided by some embodiments of the present application. Figure 11 Schematically shows a partial structure of the insulating member 70 and the electrode assembly 60 in an assembled state provided by some embodiments of the present application. Figure 12 Schematically shows a partial cross-sectional structure of the battery cell 30 provided by some embodiments of the present application. Refer to Figure 10 、 Figure 11 and Figure 12As shown, the bottom support block 72 of the insulating member 70 protrudes from the bottom plate 71 towards the bottom wall 501 of the housing 50. Along the thickness direction Z of the bottom plate 71, the bottom plate 71 is located between the bottom support block 72 and the electrode assembly 60. The bottom support block 72 of the insulating member 70 can be in contact with the bottom wall 501 of the housing 50. The bottom support block 72 is provided on the side of the bottom plate 71 facing the bottom wall 501 of the housing 50. The bottom plate 71 can be in contact with the electrode assembly 60.

[0117] The bottom support block 72 can support and elevate the bottom plate 71, which is beneficial for the bottom plate 71 to avoid the rounded corner R transition area on the housing 50. After the electrode assembly 60, the insulating member 70 and the housing 50 are assembled, the rounded corner R transition area on the housing 50 is not likely to squeeze the bottom plate 71, effectively reducing the possibility that the rounded corner R transition area on the housing 50 squeezes the bottom plate 71 and causes local deformation of the bottom plate 71, thereby reducing the possibility that the local deformation of the bottom plate 71 squeezes the electrode assembly 60 and causes local deformation of the electrode assembly 60.

[0118] In some implementable ways, Figure 13 Schematically shows a partial cross-sectional structure of the insulating member 70 provided by some embodiments of the present application. Refer to Figure 12 and Figure 13 As shown, the bottom support block 72 protrudes from the bottom plate 71 towards the bottom wall 501. The bottom support block 72 includes a connecting portion 721 and an extending portion 722. The connecting portion 721 of the bottom support block 72 is connected to the bottom plate 71. Along the thickness direction Z of the bottom plate 71, the orthographic projection of the connecting portion 721 of the bottom support block 72 is located within the orthographic projection of the bottom plate 71. The extending portion 722 of the bottom support block 72 extends beyond the outer edge of the bottom plate 71. Along the thickness direction Z of the bottom plate 71, the orthographic projection of the extending portion 722 of the bottom support block 72 is located outside the orthographic projection of the bottom plate 71. A stepped structure is formed between the extending portion 722 of the bottom support block 72 and the bottom plate 71. In the direction perpendicular to the thickness direction Z of the bottom plate 71, the portion of the bottom support block 72 that extends beyond the bottom plate 71 forms the extending portion 722.

[0119] The bottom support block 72 can support and elevate the bottom plate 71. At the same time, the way that the extending portion 722 extends beyond the bottom plate 71 can effectively increase the distance between the bottom plate 71 and the housing 50, and the extending portion 722 can play a protective role for the bottom plate 71, which is beneficial for the bottom plate 71 to effectively avoid the rounded corner R transition area on the housing 50. After the electrode assembly 60, the insulating member 70 and the housing 50 are assembled, the rounded corner R transition area on the housing 50 is not likely to squeeze the bottom plate 71, effectively reducing the possibility that the rounded corner R transition area on the housing 50 squeezes the bottom plate 71 and causes local deformation of the bottom plate 71, thereby reducing the possibility that the local deformation of the bottom plate 71 squeezes the electrode assembly 60 and causes local deformation of the electrode assembly 60.

[0120] In addition, the way in which the outer extension portion 722 of the bottom support block 72 extends beyond the bottom plate 71 can help increase the gap between the insulating member 70 and the side shell portion 52 of the housing 50. Thus, in the case of thermal runaway of the electrode assembly 60, the airflow entering the space between two or more bottom support blocks 72 can quickly flow through the gap between the insulating member 70 and the side shell portion 52 of the housing 50 to be discharged at the pressure relief mechanism, which helps reduce the severity of thermal runaway.

[0121] In some examples, referring to Figure 13 as shown, the maximum dimension D of the outer extension portion 722 extending beyond the outer edge of the bottom plate 71, where 0 mm < D ≤ 1.5 mm.

[0122] Exemplarily, the maximum dimension D of the outer extension portion 722 extending beyond the outer edge of the bottom plate 71, where 0.5 mm ≤ D ≤ 1.5 mm, or 0.5 mm ≤ D ≤ 1 mm, or 1 mm ≤ D ≤ 1.5 mm.

[0123] Exemplarily, the maximum dimension D of the outer extension portion 722 extending beyond the outer edge of the bottom plate 71, where D is equal to 0.3 mm, 0.4 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.1 mm, 1.2 mm, 1.3 mm or 1.4 mm.

[0124] When the maximum dimension D of the outer extension portion 722 extending beyond the outer edge of the bottom plate 71 is greater than 1.5 mm, the dimension of the outer extension portion 722 extending beyond the bottom plate 71 is relatively large. Due to the limitation of the size of the insulating member 70, the dimensional adaptability of the electrode assembly 60 is reduced, resulting in a relatively low energy density of the battery cell 30. In the embodiments of the present application, the setting method of the maximum dimension of the outer extension portion 722 extending beyond the outer edge of the bottom plate 71 can help solve the above technical problems.

[0125] In some realizable ways, referring to Figure 13 as shown, the bottom plate 71 can be rectangular. Along the length direction X of the bottom plate 71, two or more bottom support blocks 72 are provided on the bottom plate 71. Along the length direction X of the bottom plate 71, the two or more bottom support blocks 72 are spaced apart. The two or more bottom support blocks 72 can simultaneously provide a supporting force for the electrode assembly 60 to support the electrode assembly 60 at different positions, realizing multi-point support for the electrode assembly 60 and improving the force balance and position stability of the electrode assembly 60.

[0126] Figure 14 Schematically showing the partial structure of the battery cell 30 provided by some embodiments of the present application. Referring to Figure 14As shown, the electrode assembly 60 is a flat structure. The electrode assembly 60 includes a large surface 601 with a relatively large area and a narrow surface 602 with a relatively small area. The large surface 601 and the narrow surface 602 of the electrode assembly 60 are arranged alternately. The electrode assembly 60 may include two large surfaces 601 and two narrow surfaces 602. The large surface 601 of the electrode assembly 60 is arranged corresponding to the long side of the bottom plate 71, while the narrow surface 602 of the electrode assembly 60 is arranged corresponding to the short side of the bottom plate 71. Along the length direction X of the bottom plate 71, the overall size of the electrode assembly 60 is relatively large. Therefore, adopting the method of using more than two bottom support blocks 72 to support the electrode assembly 60 simultaneously is beneficial to reducing the area of the suspended area below the electrode assembly 60, improving the supporting effect of the bottom support blocks 72 on the electrode assembly 60, and is beneficial to reducing the possibility of structural deformation of the electrode assembly 60 in the suspended area.

[0127] In some examples, the width of each bottom support block 72 in the width direction Y of the bottom plate 71 may be equal to the width of the bottom plate 71. Exemplarily, two bottom support blocks 72 are arranged on the bottom plate 71. In the length direction X of the bottom plate 71, one bottom support block 72 is arranged at each of the opposite ends of the bottom plate 71.

[0128] In some examples, along the length direction X of the bottom plate 71, more than two bottom support blocks 72 are arranged on the bottom plate 71, and along the width direction Y of the bottom plate 71, more than two bottom support blocks 72 are arranged on the bottom plate 71. The more than two bottom support blocks 72 may be arranged in an array.

[0129] In some examples, referring to Figure 14 As shown, the battery cell 30 is a cubic square battery cell 30. The housing 50 may be a cubic square housing. The bottom housing portion 51 of the housing 50 is rectangular. The side housing portion 52 of the housing 50 includes a first side portion 521 with a relatively large area and a second side portion 522 with a relatively small area. The first side portion 521 and the second side portion 522 are arranged alternately. The first side portion 521 is connected to the long side of the bottom housing portion 51. The second side portion 522 is connected to the short side of the bottom housing portion 51. The bottom plate 71 may be rectangular. The long side of the bottom plate 71 is arranged corresponding to the long side of the bottom housing portion 51. The short side of the bottom plate 71 is arranged corresponding to the short side of the bottom housing portion 51.

[0130] In some realizable ways, along the length direction X of the bottom plate 71, the sum of the maximum sizes of the respective bottom support blocks 72 is C1, and the maximum size of the electrode assembly 60 is C2, where 1 / 5 ≤ C1 / C2 ≤ 2 / 3.

[0131] When C1 / C2 is less than 1 / 5, the total area of the respective supporting regions of each bottom support block 72 for the electrode assembly 60 is relatively small, making the total area of the suspended region below the electrode assembly 60 relatively large, which is not conducive to the force balance and position stability of the electrode assembly 60. When C1 / C2 is greater than 2 / 3, the total area of the respective supporting regions of each bottom support block 72 for the electrode assembly 60 is relatively large, but the spacing between the respective bottom support blocks 72 in the length direction X of the bottom plate 71 is relatively small. On the one hand, it is not conducive to the air flow between the respective bottom support blocks 72, increasing the air flow resistance between the respective bottom support blocks 72. On the other hand, it is not conducive to accommodating more electrolyte in the space between the respective bottom support blocks 72. The embodiments of the present application select the above value range, which is beneficial to solving the above technical problems.

[0132] In some examples, the electrode assembly 60 is a flat structure. The electrode assembly 60 includes a large surface 601 and a narrow surface 602. The large surface 601 of the electrode assembly 60 is arranged corresponding to the long side of the bottom plate 71, while the narrow surface 602 of the electrode assembly 60 is arranged corresponding to the short side of the bottom plate 71.

[0133] In some examples, Figure 15 Schematically shows a partial cross-sectional structure of the battery cell 30 provided by some embodiments of the present application. Refer to Figure 15 As shown, along the length direction X of the bottom plate 71, the maximum dimensions of the respective bottom support blocks 72 are the same. Along the length direction X of the bottom plate 71, the maximum dimension of one bottom support block 72 can be C11. Along the length direction X of the bottom plate 71, N bottom support blocks 72 are arranged at intervals. The sum of the maximum dimensions of the respective bottom support blocks 72 is C1, where C1 is equal to N*C11. Exemplarily, N is equal to 3. The sum of the maximum dimensions of the respective bottom support blocks 72 is C1, where C1 is equal to 3*C11.

[0134] In some examples, Figure 16 Schematically shows a partial cross-sectional structure of the battery cell 30 provided by some embodiments of the present application. Refer to Figure 16 As shown, along the length direction X of the bottom plate 71, the maximum dimensions of the respective bottom support blocks 72 are different. Along the length direction X of the bottom plate 71, the maximum dimensions of the respective bottom support blocks 72 can be C11, C12, C13,..., C1n. Along the length direction X of the bottom plate 71, n bottom support blocks 72 are arranged at intervals. The sum of the maximum dimensions of the respective bottom support blocks 72 is C1, where C1 = C11 + C12 + C13 +... + C1n. Exemplarily, N is equal to 3. The sum of the maximum dimensions of the respective bottom support blocks 72 is C1, where C1 = C11 + C12 + C13.

[0135] In some examples, along the length direction X of the bottom plate 71, the sum of the maximum dimensions of each bottom support block 72 is C1, and the maximum dimension of the electrode assembly 60 is C2, where 1 / 4 ≤ C1 / C2 ≤ 2 / 3, or 1 / 4 ≤ C1 / C2 ≤ 1 / 2, or 1 / 5 ≤ C1 / C2 ≤ 1 / 2, or 1 / 2 ≤ C1 / C2 ≤ 2 / 3.

[0136] In some implementable ways, the bottom support block 72 protrudes from the bottom plate 71 towards the bottom wall 501. The housing 50 further includes an inner side wall 502. A fillet R is provided for transition between the bottom wall 501 and the inner side wall 502 of the housing 50. The inner side wall 502 of the side shell portion 52 of the housing 50 faces the electrode assembly 60. The bottom wall 501 of the bottom shell portion 51 of the housing 50 faces the electrode assembly 60. The way of providing the fillet R between the bottom wall 501 and the inner side wall 502 of the housing 50 can effectively reduce the internal stress of the housing 50, thereby reducing the possibility of the housing 50 breaking or deforming under the action of internal stress.

[0137] The surface shape of the bottom support block 72 facing the fillet R of the housing 50 matches the shape of the fillet R of the housing 50. A fillet R is also provided for transition on the bottom support block 72 provided at the edge of the bottom plate 71, so that the bottom support block 72 can be fitted with the fillet R of the housing 50, which is beneficial to the accurate positioning of the insulating part 70 in the housing 50, reducing the possibility of the insulating part 70 deforming due to inaccurate positioning after being inserted into the housing 50. At the same time, when the battery cell 30 vibrates, it is beneficial to ensure that the position of the bottom support block 72 is not easily shifted relative to the electrode assembly 60.

[0138] In some examples, the material of the housing 50 can be a metal material. The housing 50 is manufactured by stamping process, and a fillet R is formed between the bottom wall 501 and the inner side wall 502 of the housing 50.

[0139] In some implementable ways, Figure 17 Schematically shows a partial cross-sectional structure of the battery cell 30 provided by some embodiments of the present application. Refer to Figure 17 As shown, the bottom plate 71 can be rectangular. Along the width direction Y of the bottom plate 71, more than two bottom support blocks 72 are provided on the bottom plate 71. Along the width direction Y of the bottom plate 71, the more than two bottom support blocks 72 are arranged at intervals. The more than two bottom support blocks 72 can simultaneously provide a supporting force for the electrode assembly 60 to support the electrode assembly 60 at different positions, realizing multi-point support for the electrode assembly 60, and improving the force balance and position stability of the electrode assembly 60.

[0140] The electrode assembly 60 is a flat-structured body. The electrode assembly 60 includes a large surface 601 with a relatively large area and a narrow surface 602 with a relatively small area. The large surface 601 and the narrow surface 602 of the electrode assembly 60 are arranged alternately. The large surface 601 of the electrode assembly 60 is arranged corresponding to the long side of the bottom plate 71, while the narrow surface 602 of the electrode assembly 60 is arranged corresponding to the short side of the bottom plate 71. Along the width direction Y of the bottom plate 71, the method of using more than two bottom support blocks 72 to support the electrode assembly 60 simultaneously is beneficial to reducing the area of the suspended area below the electrode assembly 60, improving the supporting effect of the bottom support blocks 72 on the electrode assembly 60, and is beneficial to reducing the possibility of structural deformation of the electrode assembly 60 in the suspended area.

[0141] In some examples, the length of each bottom support block 72 in the length direction X of the bottom plate 71 can be less than the length of the bottom plate 71.

[0142] In some examples, along the width direction Y of the bottom plate 71, more than two bottom support blocks 72 are arranged on the bottom plate 71, and along the length direction X of the bottom plate 71, more than two bottom support blocks 72 are arranged on the bottom plate 71. The more than two bottom support blocks 72 can be arranged in an array.

[0143] In some examples, the number of electrode assemblies 60 is one. Along the width direction Y of the bottom plate 71, the sum of the maximum dimensions of the respective bottom support blocks 72 is K1, and the maximum dimension of the electrode assembly 60 is K2, where 1 / 4 ≤ K1 / K2 < 1.

[0144] When K1 / K2 is less than 1 / 4, the total area of the respective supporting areas of the respective bottom support blocks 72 for the electrode assembly 60 is relatively small, so that the total area of the suspended area below the electrode assembly 60 is relatively large, which is not conducive to the force balance and position stability of the electrode assembly 60. When K1 / K2 is equal to 1, the total area of the respective supporting areas of the respective bottom support blocks 72 for the electrode assembly 60 is relatively large, but there is no spacing between the respective bottom support blocks 72 in the width direction Y of the bottom plate 71, so that no space for air flow or electrolyte accommodation can be formed between the respective bottom support blocks 72. The embodiments of the present application select the above value range, which is beneficial to solving the above technical problems.

[0145] Exemplarily, referring to Figure 17 As shown, along the width direction Y of the bottom plate 71, the maximum dimensions of the respective bottom support blocks 72 are the same. Along the width direction Y of the bottom plate 71, the maximum dimension of one bottom support block 72 can be K11. Along the width direction Y of the bottom plate 71, N bottom support blocks 72 are arranged at intervals. The sum of the maximum dimensions of the respective bottom support blocks 72 is K1, where K1 is equal to N*K11. Exemplarily, N is equal to 3. The sum of the maximum dimensions of the respective bottom support blocks 72 is K1, where K1 is equal to 3*K11.

[0146] Exemplarily, Figure 18Schematically shows a partial cross-sectional structure of a battery cell 30 provided by some embodiments of the present application. Refer to Figure 18 As shown, along the width direction Y of the bottom plate 71, the maximum dimensions of the respective bottom support blocks 72 are different. Along the width direction Y of the bottom plate 71, the maximum dimensions of the respective bottom support blocks 72 can be K11, K12, K13, ……, K1n. Along the width direction Y of the bottom plate 71, N bottom support blocks 72 are arranged at intervals. The sum of the maximum dimensions of the respective bottom support blocks 72 is K1, where K1 = K11 + K12 + K13 + …… + K1n. Exemplarily, n is equal to 3. The sum of the maximum dimensions of the respective bottom support blocks 72 is K1, where K1 = K11 + K12 + K13.

[0147] Exemplarily, along the width direction Y of the bottom plate 71, the sum of the maximum dimensions of the respective bottom support blocks 72 is K1, and the maximum dimension of the electrode assembly 60 is K2, where 2 / 3 ≤ K1 / K2 < 1, or 2 / 3 ≤ K1 / K2 ≤ 3 / 4, or 1 / 2 ≤ K1 / K2 ≤ 3 / 4, or 1 / 2 ≤ K1 / K2 < 1.

[0148] In some examples, Figure 19 Schematically shows a partial cross-sectional structure of a battery cell 30 provided by some embodiments of the present application. Refer to Figure 19 As shown, the number of electrode assemblies 60 is more than two. More than two electrode assemblies 60 are arranged side by side along the width direction Y of the bottom plate 71. Along the width direction Y of the bottom plate 71, the sum of the maximum dimensions of the respective bottom support blocks 72 is K1, and the sum of the maximum dimensions of the respective electrode assemblies 60 is K3, where 1 / 4 ≤ K1 / K3 < 1.

[0149] When K1 / K3 is less than 1 / 4, the total area of the respective supporting regions of the respective bottom support blocks 72 for the electrode assemblies 60 is relatively small, such that the total area of the regions suspended below the respective electrode assemblies 60 is relatively large, which is not conducive to the force balance and position stability of the electrode assemblies 60. When K1 / K3 is equal to 1, the total area of the supporting regions of the respective bottom support blocks 72 for the respective electrode assemblies 60 is relatively large, but there is no gap between the respective bottom support blocks 72 in the width direction Y of the bottom plate 71, such that a space for air flow or electrolyte accommodation cannot be formed between the respective bottom support blocks 72. The embodiments of the present application select the above value ranges, which is beneficial to solving the above technical problems.

[0150] Exemplarily, the electrode assembly 60 is a flat-shaped structure. The electrode assembly 60 includes a large surface 601 with a relatively large area and a narrow surface 602 with a relatively small area. The large surface 601 and the narrow surface 602 of the electrode assembly 60 are alternately arranged. Along the width direction Y of the bottom plate 71, the large surface 601 of one of the adjacent two electrode assemblies 60 faces the large surface 601 of the other.

[0151] Exemplarily, refer toFigure 19 As shown, along the width direction Y of the bottom plate 71, the maximum dimensions of the respective electrode assemblies 60 are the same. Along the width direction Y of the bottom plate 71, the maximum dimension of one electrode assembly 60 may be K31. Along the width direction Y of the bottom plate 71, N electrode assemblies 60 are arranged side by side. The sum of the maximum dimensions of the respective electrode assemblies 60 is K3, where K3 is equal to N * K31. Exemplarily, N is equal to 4. The sum of the maximum dimensions of the respective electrode assemblies 60 is K3, where K3 is equal to 4 * K31.

[0152] Exemplarily, Figure 20 Schematically shows a partial cross-sectional structure of the battery cell 30 provided by some embodiments of the present application. Refer to Figure 20 As shown, along the width direction Y of the bottom plate 71, the maximum dimensions of the respective electrode assemblies 60 are different. Along the width direction Y of the bottom plate 71, the maximum dimensions of the respective electrode assemblies 60 may be K31, K32, K33,..., K3n. The sum of the maximum dimensions of the respective electrode assemblies 60 is K3, where K3 = K31 + K32 + K33 +... + K3n. Exemplarily, n is equal to 4. The sum of the maximum dimensions of the respective electrode assemblies 60 is K3, where K3 = K31 + K32 + K33 + K34.

[0153] Exemplarily, the sum of the maximum dimensions of the respective bottom support blocks 72 is K1, and the sum of the maximum dimensions of the respective electrode assemblies 60 is K3, where 2 / 3 ≤ K1 / K3 < 1, or 2 / 3 ≤ K1 / K3 ≤ 3 / 4, or 1 / 2 ≤ K1 / K3 ≤ 3 / 4, or 1 / 2 ≤ K1 / K3 < 1.

[0154] In some realizable ways, the bottom plate 71 may be rectangular. The number of electrode assemblies 60 is more than two. The respective electrode assemblies 60 are arranged side by side along the width direction Y of the bottom plate 71. The arrangement of multiple electrode assemblies 60 is beneficial to improving the energy density of the battery cell 30. Each of the electrode assemblies 60 is supported by a corresponding bottom support block 72. Each electrode assembly 60 is supported by the bottom support block 72, so that any one of the electrode assemblies 60 will not be in a suspended state, reducing the possibility of structural deformation of the electrode assembly 60 in the suspended area due to the loss of support when the electrode assembly 60 is in a suspended state.

[0155] In some examples, at least one bottom support block 72 may support two adjacent electrode assemblies 60 at the same time.

[0156] In some examples, at least one electrode assembly 60 may be supported by two adjacent bottom support blocks 72.

[0157] In some examples, the electrode assembly 60 is a flat structural body. The electrode assembly 60 includes a large surface 601 with a relatively large area and a narrow surface 602 with a relatively small area. The large surface 601 and the narrow surface 602 of the electrode assembly 60 are arranged alternately. Along the width direction Y of the bottom plate 71, the large surface 601 of one of the adjacent two electrode assemblies 60 faces the large surface 601 of the other.

[0158] In some realizable ways, the bottom plate 71 can be rectangular. Bottom support blocks 72 are respectively arranged at the four top corners of the bottom plate 71. Four bottom support blocks 72 are arranged on the bottom plate 71. The four bottom support blocks 72 can provide a supporting force for the electrode assembly 60. The four bottom support blocks 72 can form support points at four different positions of the electrode assembly 60, which is beneficial to ensuring the position stability of the electrode assembly 60. The number of the bottom support blocks 72 is relatively small, which is beneficial to reducing the weight of the insulating part 70 itself while satisfying the support of the electrode assembly 60, thereby being beneficial to improving the energy density of the battery cell 30.

[0159] In some examples, the four bottom support blocks 72 have the same shape and size.

[0160] In some realizable ways, the housing 50 further includes an inner side wall 502. There is a fillet R transition between the bottom wall 501 and the inner side wall 502. The distance between the electrode assembly 60 and the bottom wall 501 is greater than or equal to the radius of the fillet R. The bottom support blocks 72 and the bottom plate 71 can support and elevate the electrode assembly 60, so that the electrode assembly 60 can avoid the fillet R on the housing 50, effectively reducing the possibility of contact between the electrode assembly 60 and the fillet R on the housing 50.

[0161] In some realizable ways, Figure 21 Schematically shows a partial cross-sectional structure of the battery cell 30 provided by some embodiments of the present application. Refer to Figure 21 As shown, the battery cell 30 further includes an end cap 40. The end cap 40 is connected to the housing 50. The end cap 40 covers the opening 50a of the housing 50. The insulating part 70 is connected to the end cap 40. Exemplarily, after electrically connecting the electrode assembly 60 to the electrode terminal 41 provided on the end cap 40, the electrode assembly 60 and the insulating part 70 can be assembled. Then, the insulating part 70 and the end cap 40 are connected. After the electrode assembly 60, the insulating part 70 and the end cap 40 are assembled, the overall structure formed by the electrode assembly 60, the insulating part 70 and the end cap 40 is assembled with the housing 50. After the electrode assembly 60 and the insulating part 70 are installed in the housing 50, the end cap 40 can be connected to the housing 50.

[0162] The way the insulating part 70 is connected to the end cover 40, on the one hand, can ensure that the insulating part 70 wrapped around the outside of the electrode assembly 60 is not prone to looseness and dispersion, which is beneficial to improving the convenience of the subsequent process of installing the electrode assembly 60 and the insulating part 70 into the housing 50 and improving the assembly efficiency. On the other hand, it can ensure that after the insulating part 70 is installed in the housing 50, the position of the insulating part 70 itself is not prone to deviation and its structure is not prone to deformation, ensuring that the position accuracy of the insulating part 70 after being installed in the housing 50 meets the requirements.

[0163] In some implementable ways, the housing 50 further includes an inner side wall 502. The insulating part 70 includes a side plate 73. The bottom plate 71 of the insulating part 70 is connected to the side plate 73. The side plate 73 of the insulating part 70 is located between the electrode assembly 60 and the inner side wall 502 of the housing 50. The side plate 73 of the insulating part 70 can isolate the electrode assembly 60 and the inner side wall 502 of the housing 50, which is beneficial to further improving the insulation isolation effect of the insulating part 70 on the electrode assembly 60.

[0164] In some examples, the bottom plate 71 and the side plate 73 of the insulating part 70 enclose a cylindrical structure. The accommodating space formed by the bottom plate 71 and the side plate 73 of the insulating part 70 is used to accommodate the electrode assembly 60.

[0165] In some examples, the bottom plate 71 and the side plate 73 of the insulating part 70 can be an integrally formed structure.

[0166] In some examples, the housing 50 includes a bottom shell part 51 and a side shell part 52. The side shell part 52 has an inner side wall 502. The side plate 73 of the insulating part 70 is located between the electrode assembly 60 and the side shell part 52 of the housing 50.

[0167] In some implementable ways, the bottom plate 71 of the insulating part 70 and the bottom support block 72 are an integrally formed structure. Using a blank to directly process the bottom plate 71 and the bottom support block 72 simultaneously, on the one hand, it can eliminate the connection process between the bottom plate 71 and the bottom support block 72, simplify the production process, and improve the production efficiency. On the other hand, it is beneficial to improve the connection strength between the bottom plate 71 and the bottom support block 72, effectively reducing the possibility of the bottom support block 72 separating from the bottom plate 71.

[0168] The embodiment of the present application further provides a battery 10, including the battery cell 30 of any of the above solutions.

[0169] The embodiment of the present application further provides an electrical device, including the battery 10 of any of the above solutions, and the battery 10 is used to provide electrical energy for the electrical device. The electrical device can be any of the aforementioned devices or systems that apply the battery 10.

[0170] The embodiment of the present application further provides an insulating member 70 for a battery cell 30. The insulating member 70 includes a bottom plate 71 and more than two bottom support blocks 72. The bottom support blocks 72 are connected to the bottom plate 71, and the bottom support blocks 72 protrude from the bottom plate 71 along the thickness direction Z of the bottom plate 71.

[0171] In some realizable ways, the insulating member 70 further includes side plates 73. The side plates 73 are respectively connected to the opposite sides of the bottom plate 71. The side plates 73 on one side of the bottom plate 71 are symmetrically arranged relative to the bottom plate 71 with respect to the side plates 73 on the other side. The side plates 73 are foldable relative to the bottom plate 71. When the side plates 73 are in the turned-up state, the side plates 73 and the bottom plate 71 enclose a receiving space.

[0172] When the insulating member 70 is in an unused state, the side plates 73 and the bottom plate 71 can be in a flat state. Exemplarily, the side plates 73 and the bottom plate 71 in the flat state can be coplanar. When it is necessary to use the insulating member 70 to cover the electrode assembly 60, the electrode assembly 60 is placed corresponding to the bottom plate 71, and then the side plates 73 are folded so that the side plates 73 are in the turned-up state. The side plates 73 and the bottom plate 71 enclose a receiving space. The electrode assembly 60 is located in the receiving space.

[0173] In some examples, the bottom plate 71 can be rectangular. Along the width direction Y of the bottom plate 71, the side plates 73 are respectively connected to the opposite sides of the bottom plate 71. Exemplarily, the bottom plate 71 can be rectangular.

[0174] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing, including an opening and a bottom wall corresponding to the opening; An electrode assembly disposed within the housing; An insulating member disposed within the housing, the insulating member being disposed between the housing and the electrode assembly, the insulating member including a bottom plate and more than two bottom supporting blocks, the bottom supporting blocks being disposed on the bottom plate and protruding from the bottom plate, both the bottom plate and the bottom supporting blocks being disposed between the electrode assembly and the bottom wall, the bottom supporting blocks supporting the electrode assembly, and there being a spacing between the electrode assembly and the bottom wall.

2. The battery cell according to claim 1, characterized in that, In the thickness direction of the bottom plate, the orthographic projection of the bottom supporting block is located within the orthographic projection of the bottom plate.

3. The battery cell according to claim 2, characterized in that, The outer edge of the bottom supporting block coincides with the outer edge of the bottom plate.

4. The battery cell according to claim 1, characterized in that, The bottom supporting block protrudes from the bottom plate towards the electrode assembly; or, the bottom supporting block protrudes from the bottom plate towards the bottom wall.

5. The battery cell according to claim 1, characterized in that, The bottom supporting block protrudes from the bottom plate towards the bottom wall, the bottom supporting block including a connecting portion and an extending portion, the connecting portion being connected to the bottom plate, and the extending portion extending beyond the outer edge of the bottom plate.

6. The battery cell according to claim 5, characterized in that, The maximum dimension by which the extending portion extends beyond the outer edge of the bottom plate is D, where 0 mm < D ≤ 1.5 mm.

7. The battery cell according to claim 1, characterized in that, The bottom plate is rectangular, and more than two of the bottom supporting blocks are disposed on the bottom plate along the length direction of the bottom plate.

8. The battery cell according to claim 7, characterized in that, Along the length direction of the bottom plate, the sum of the maximum dimensions of each of the bottom supporting blocks is C1, and the maximum dimension of the electrode assembly is C2, where 1 / 5 ≤ C1 / C2 ≤ 2 / 3.

9. The battery cell according to claim 1, characterized in that, The bottom supporting block protrudes from the bottom plate towards the bottom wall, the housing further includes an inner side wall, and there is a rounded transition between the bottom wall and the inner side wall, and the surface shape of the bottom supporting block facing the rounded corner matches the shape of the rounded corner.

10. The battery cell according to any one of claims 1 to 9, characterized in that, The bottom plate is rectangular, and more than two of the bottom supporting blocks are disposed on the bottom plate along the width direction of the bottom plate.

11. The battery cell according to claim 10, wherein, The number of the electrode assemblies is one, along the width direction of the bottom plate, the sum of the maximum dimensions of each of the bottom supporting blocks is K1, and the maximum dimension of the electrode assembly is K2, where 1 / 4 ≤ K1 / K2 < 1; or, The number of the electrode assemblies is more than two, and the more than two electrode assemblies are arranged side by side along the width direction of the bottom plate, along the width direction of the bottom plate, the sum of the maximum dimensions of each of the bottom supporting blocks is K1, and the sum of the maximum dimensions of each of the electrode assemblies is K3, where 1 / 4 ≤ K1 / K3 < 1.

12. The battery cell according to any one of claims 1 to 9, characterized in that, The bottom plate is rectangular, the number of the electrode assemblies is more than two, and each of the electrode assemblies is arranged side by side along the width direction of the bottom plate, and each of the electrode assemblies is supported by the corresponding bottom supporting block.

13. The battery cell according to any one of claims 1 to 9, characterized in that, The bottom plate is rectangular, and the bottom supporting blocks are respectively disposed at the four top corners of the bottom plate.

14. The battery cell according to any one of claims 1 to 9, characterized in that, The housing further includes an inner side wall, and there is a rounded transition between the bottom wall and the inner side wall, and the spacing between the electrode assembly and the bottom wall is greater than or equal to the radius of the rounded corner.

15. The battery cell according to any one of claims 1 to 9, characterized in that, The battery cell further includes an end cap, the end cap is connected to the housing, the end cap covers the opening of the housing, and the insulating member is connected to the end cap.

16. The battery cell according to any one of claims 1 to 9, characterized in that, The housing further includes an inner sidewall, the insulating member includes a side plate, the bottom plate is connected to the side plate, and the side plate is located between the electrode assembly and the inner sidewall.

17. The battery cell according to any one of claims 1 to 9, characterized in that, The bottom plate and the bottom support block are of an integrally formed structure.

18. A battery, characterized in that, It includes a battery cell according to any one of claims 1 to 17.

19. An electrical device, characterized in that, It includes the battery according to claim 18, and the battery is used to provide electric energy.

20. An insulating member for a battery cell, characterized in that, The insulating member includes: A bottom plate and more than two bottom support blocks; the bottom support blocks are connected to the bottom plate, and along the thickness direction of the bottom plate, the bottom support blocks protrude from the bottom plate.

21. The insulating member according to claim 20, wherein, The insulating member further includes side plates, the two opposite sides of the bottom plate are respectively connected to the side plates, the side plates on one side of the bottom plate are symmetrically arranged relative to the side plates on the other side with respect to the bottom plate, the side plates are foldable relative to the bottom plate, and when the side plates are in the turned-up state, the side plates and the bottom plate enclose to form an accommodation space.

Images