Battery monomer, battery and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery monomer, a battery and electric equipment, the battery monomer comprises a shell, an electrode assembly, an insulating part, a bracket and a connecting piece, the shell comprises a wall part, the electrode assembly is accommodated in the shell, the insulating part is arranged between the electrode assembly and the wall part, the insulating part comprises an accommodating groove, the bracket is arranged in the accommodating groove, and the connecting piece is arranged in the accommodating groove. And the insulating piece is connected with the wall part through the connecting piece. In the first direction, the projection of the connecting piece falls into the range of the support, and the first direction is the width direction of the wall part. According to the battery monomer provided by the invention, the connecting piece is additionally arranged between the wall part of the shell and the insulating piece, and the shell and the insulating piece are connected through the connecting piece, so that the probability that a gap at the joint of the shell and the insulating piece is pulled open by external force is reduced, and the probability that the bracket is exposed from the accommodating groove due to vibration is reduced; and the structural stability of the battery monomer in the normal use process can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular provides a battery housing, a battery monomer, a battery and an electrical device. Background Art

[0002] A corresponding boss structure will be formed between the top cover and the lower plastic of the battery cell, and a through hole or a through groove will be opened on the side of the corresponding boss of the lower plastic; in the later stage of thermal runaway, after the explosion-proof valve opens, the strong air pressure causes the electrode assembly as a whole to impact toward the top cover, and the high temperature melts the lower plastic. When the electrode assembly and the top cover are in contact, the air channel formed between the top cover and the lower plastic is blocked, and finally the heat spreads to the adjacent battery cells.

[0003] In some current solutions, a metal bracket is set between the top cover and the lower plastic for support to facilitate exhaust in the later stage of thermal runaway. However, during the vibration of the battery cell, the metal bracket is shaken out, causing the risk of short circuit of the electrode assembly. Utility Model Content

[0004] The utility model aims to provide a battery cell, a battery and an electrical device, aiming to improve the problem of poor structural stability of the battery cell during normal use.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] In a first aspect, an embodiment of the present application provides a battery cell, including:

[0007] a housing, the housing comprising a wall portion;

[0008] an electrode assembly, the electrode assembly being accommodated in the housing;

[0009] An insulating member, the insulating member is disposed between the electrode assembly and the wall portion, and the insulating member includes a receiving groove;

[0010] A bracket, the bracket being arranged in the receiving groove;

[0011] A connecting member, through which the insulating member is connected to the wall portion;

[0012] Wherein, along a first direction, a projection of the connecting member falls within the range of the bracket, and the first direction is a width direction of the wall portion.

[0013] Beneficial effects of the embodiments of the present application: In the battery cell provided by the present application, a connecting piece is additionally provided between the wall portion of the outer shell and the insulating piece, and the outer shell and the insulating piece are connected by the connecting piece. At the same time, the setting position of the connecting piece can interfere with the bracket to a certain extent in the first direction, so as to reduce the probability that the gap at the connection between the two is pulled apart by external force, thereby reducing the probability of the bracket being exposed from the receiving groove due to vibration, and can effectively improve the structural stability of the battery cell during normal use.

[0014] In some embodiments, the housing includes a top cover, and the top cover includes the wall portion.

[0015] In some embodiments, the connecting member has a first end connected to the insulating member and a second end connected to the top cover.

[0016] In some embodiments, the connecting member comprises a hot melt member, the first end of the hot melt member is integrally formed with the insulating member; and / or the second end of the hot melt member is hot-melt connected to the top cover.

[0017] In some embodiments, in the thickness direction of the top cover, a projected area of ​​the second end is larger than a projected area of ​​the first end surface.

[0018] In some embodiments, a step hole is formed on the top cover, and the second end is hot-melt connected to the step hole.

[0019] In some embodiments, there are multiple connecting members, each of which is disposed around the outer circumference of the receiving groove.

[0020] In some embodiments, the insulating member is a square insulating member, the accommodating groove is provided at the wide side end of the square insulating member, and each of the connecting members is arranged on opposite sides of the bracket along the width direction of the square insulating member.

[0021] In some embodiments, a center line of a location where the bracket is connected to the top cover coincides with a line connecting center points of each of the connectors.

[0022] In some embodiments, the distance between the center points of the two connecting members closest to the bracket is L1, the length of the bracket is L2, and the range of L1 / L2 is 1.2-5.

[0023] In some embodiments, the range of L1 / L2 is 2-3.

[0024] In some embodiments, the connecting piece is in a columnar structure, and the diameter of the connecting piece is 1.5 mm to 3 mm.

[0025] In a second aspect, an embodiment of the present application further provides a battery, comprising the battery cell described above.

[0026] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the battery described above.

[0027] It can be understood that the beneficial effects of the second and third aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the structure of an electrical device provided in an embodiment of the utility model;

[0030] Figure 2 A schematic diagram of the structure of a battery provided in an embodiment of the utility model;

[0031] Figure 3 An exploded view of a battery cell provided in an embodiment of the utility model;

[0032] Figure 4 A schematic diagram of the assembly structure of the top cover and the insulating member of the battery cell provided in the embodiment of the utility model;

[0033] Figure 5 An exploded view of a top cover and an insulating member of a battery cell provided in an embodiment of the utility model;

[0034] Figure 6 A cross-sectional view of a battery cell provided by an embodiment of the utility model;

[0035] Figure 7 for Figure 6 The enlarged view of point A in the middle;

[0036] Figure 8 for Figure 7 The enlarged view of point B in the middle;

[0037] Fig. 9 A schematic diagram of the partial structure of an insulating member provided in an embodiment of the utility model.

[0038] Among them, the reference numerals in the figure are:

[0039] 10000, electrical equipment; 1000, controller; 2000, motor;

[0040] 3000, battery; 3001, battery box; 30011, first part; 30012, second part;

[0041] 100. Battery cell;

[0042] 10. housing; 10a. wall; 11. bracket; 12. step hole; 13. top cover;

[0043] 20. Insulating member; 20a. Accommodating groove;

[0044] 30, connecting member; 30a, first end; 30b, second end;

[0045] 40. Electrode assembly;

[0046] A, position center line; B, line connecting the center points of the connector; X, first direction. DETAILED DESCRIPTION

[0047] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0048] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] At present, power batteries generally adopt a square hard shell structure. The outer shell of the power battery includes a shell and a top cover assembly. The shell provides a closed space to accommodate the electrode assembly and the electrolyte. The electric energy of the electrode assembly is led out of the closed space through the pole of the top cover assembly. The winding core and the shell inside the electrode assembly are almost tightly fitted except for the side where the pole is located. When the electrode assembly is short-circuited due to mechanical external force or other reasons, causing thermal runaway, a large amount of gas is instantly generated inside the shell. The generated gas quickly gathers inside the shell, and when the air pressure inside the shell reaches the pressure relief critical value of the pressure relief mechanism, the pressure is relieved by the pressure relief mechanism.

[0052] The failure position of the electrode assembly when thermal runaway occurs is uncertain, especially when the failure position is far away from the pressure relief mechanism. The degree of thermal runaway of the electrode assembly in the shell is severe, and the electrode assembly may even move toward the pressure relief mechanism as a whole, resulting in a reduction in the exhaust gap of the pressure relief mechanism.

[0053] In order to maintain the corresponding exhaust gap, the current solution is to set a bracket between the top cover and the lower plastic, use the bracket to support to form the side exhaust gap, or use the exhaust structure of the bracket itself to form the corresponding side exhaust gap. However, the vibration during the normal use of the battery cell will cause the risk of the bracket falling off, and the bracket will fall onto the electrode assembly, eventually causing the electrode assembly to short-circuit.

[0054] In view of this, the present application provides a battery cell, in which a connector is arranged between the wall of the shell and the insulating member, and the connector is used to increase the covering strength between the shell and the insulating member to reduce the probability of the bracket being exposed or falling out of the receiving groove of the insulating member.

[0055] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. A battery cell mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer. The current collector not coated with the positive electrode active material layer is stacked as a positive electrode tab. For the convenience of description, the term "tab" is used to refer to the positive electrode tab and / or the negative electrode tab.

[0056] In the present application, battery cells include but are not limited to lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells or magnesium-ion battery cells. Battery cells can be cylindrical, flat, rectangular or other shapes. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells.

[0057] The embodiment of the present application provides a kind of electric equipment 10000 which can be applied to vehicles, mobile phones, portable devices, laptops, ships, spacecrafts, electric tools, etc. using the above-mentioned battery cell 100 as a power source. Among them, the vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.; the spacecraft includes airplanes, rockets, space shuttles and spacecrafts, etc.; the electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc.; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and iron electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0058] The battery cell 100 described in the embodiment of the present application is not limited to the above-described electrical equipment 10000, but can also be applied to all devices using the battery cell 100. However, for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0059] For example, see Figure 1, the figure is a schematic diagram of the structure of a vehicle according to an embodiment of the present application. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 3000, a controller 1000 and a motor 2000 may be arranged inside the vehicle, and the controller 1000 is used to control the battery 3000 to supply power to the motor 2000. For example, a battery 3000 may be arranged at the bottom, front or rear of the vehicle. The battery 3000 may be used to power the vehicle. For example, the battery 3000 may be used as an operating power source for the vehicle, for the circuit system of the vehicle, for example, for the working power requirements during the start-up, navigation and operation of the vehicle. In another embodiment of the present application, the battery 3000 may not only be used as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0060] The battery 3000 mentioned in the embodiment of the present application refers to a single physical module including one or more battery cells 100 to provide higher voltage and capacity. Figure 2 , the battery 3000 may include a plurality of battery cells 100. The number of battery cells 100 and the connection between the battery cells 100 can be set as required to meet different power requirements. Specifically, a plurality of battery cells 100 can be connected in series, in parallel, or in mixed connection, and mixed connection refers to a mixture of series connection and parallel connection so that the battery 3000 has a larger capacity or power. Optionally, a plurality of battery cells 100 can be connected in series, in parallel, or in mixed connection to form a battery 3000 module, and a plurality of battery 3000 modules can be connected in series, in parallel, or in mixed connection to form a battery 3000. In other words, a plurality of battery cells can directly form a battery 3000, or they can first form a battery module, and then the battery module can form a battery 3000.

[0061] The battery 3000 also includes a battery case 3001, and the battery case 3001 has a storage space inside, and multiple battery cells are stored in the storage space. As shown in the figure, the battery case 3001 may include two parts, which are respectively referred to as the first part 30011 and the second part 30012. Please refer to Figure and Figure, which are the first part 30011 of a battery case 3001. The first part 30011 and the second part 30012 can be connected by snapping, bonding, etc. to form a storage space. Multiple battery cells are connected in parallel, series, or mixed and placed in the box formed by connecting the first part 30011 and the second part 30012. Among them, the shapes of the first part 30011 and the second part 30012 can be determined according to the shape formed by the combination of multiple battery cells.

[0062] The battery case 3001 is used to protect at least one battery cell, thereby reducing the impact of liquid or other foreign matter outside the battery 3000 on the charging or discharging of at least one battery cell. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., which are not limited in the embodiments of the present application. The packaging methods of the battery cell include but are not limited to cylindrical battery cells, square battery cells and soft-pack battery cells, etc., which are not specifically limited in the embodiments of the present application.

[0063] Please refer to Figures 3 to 5 The embodiment of the present application provides a battery cell 100 , including a housing 10 , an insulating member 20 , a bracket 11 , an electrode assembly 40 and a connector 30 .

[0064] The housing 10 includes a wall portion 10a, and the electrode assembly 40 is accommodated in the housing 10. The insulating member 20 is disposed between the electrode assembly 40 and the wall portion 10a, and the insulating member 20 includes a receiving groove 20a.

[0065] The bracket 11 is disposed in the receiving groove 20 a. The insulating member 20 is connected to the wall portion 10 a via a connecting member 30 .

[0066] Wherein, along the first direction X, the projection of the connecting member 30 falls within the range of the bracket 11 , and the first direction X is the width direction of the wall portion 11 a .

[0067] It can be understood that the housing 10 generally has an internal environment component for accommodating the electrolyte and the electrode assembly 40. Generally, the housing 10 is composed of a shell and a top cover 13. Generally, a pressure relief mechanism is provided at the housing 10.

[0068] The wall portion 10 a of the housing 10 is an inner wall of the housing 10 facing the electrode assembly 40 . For example, the wall portion 10 a may be a top inner wall, a bottom inner wall, or a side inner wall of the housing 10 .

[0069] The housing 10 is usually made of metal, so when the bracket 11 is connected to the housing 10, its material is also mostly metal, and of course, heat-resistant materials such as ceramics. For example, the bracket 11 can be connected to the housing 10 by welding or bonding, so that the structural integrity of the housing 10 is higher and the overall structural strength is less affected.

[0070] The insulating member 20 is an insulating material disposed between the outer shell 10 and the electrode assembly 40, and plays a corresponding role of insulation isolation. A common example is a lower plastic disposed between the top cover 13 and the electrode assembly 40. The receiving groove 20a is formed inwardly concave on the surface of the insulating member 20. When the outer shell 10 and the insulating member 20 are in relative position, the outer shell 10 covers the receiving cavity to form a closed or nearly closed cavity. At this time, the bracket 11 just falls into the receiving groove 20a.

[0071] The shape and structure of the connecting member 30 include but are not limited to a columnar structure, a block structure, a plate structure, and a ring structure.

[0072] The connection member 30 has some interference with the bracket 11 in the setting position. Specifically, in the first direction X, that is, the width direction of the wall portion 10a, the projection of the connection member 30 interferes with the projection of the bracket 11, so that the setting position of the connection member 30 is close to the bracket 11 and is located on the peripheral side of the bracket 11.

[0073] Here, the projection of the connector 30 falling within the range of the bracket 11 may refer to a portion of the projection of the connector 30 falling within the projection of the bracket 11 , or may refer to the entire projection of the connector 30 falling within the projection of the bracket 11 .

[0074] The material of the connector 30 includes but is not limited to plastic, resin, metal, etc. Meanwhile, the connection method of the connector 30 and the housing 10 and the connection method of the connector 30 and the insulating member 20 are selected according to the material of the connector 30 .

[0075] For example, when the connecting member 30 is made of hot-melt plastic material, one end of the connecting member 30 is connected to the housing 10 by hot-melt, and the other end of the connecting member 30 is connected to the insulating member 20 by hot-melt.

[0076] For example, when the connector 30 is made of metal, one end of the connector 30 is welded to the housing 10 , and the other end of the connector 30 is snap-fitted, threaded, plugged, bonded, etc. to the insulating member 20 .

[0077] The battery cell provided in the present application has an additional connector 30 between the outer shell 10 and the insulating member 20, and the outer shell 10 and the insulating member 20 are connected by the connector 30. At the same time, the setting position of the connector 30 in the first direction X can interfere with the bracket 11 to a certain extent, so as to reduce the probability that the gap between the two is pulled apart by external force, thereby reducing the probability of the bracket 11 being exposed from the accommodating groove 20a due to vibration, which can effectively improve the structural stability of the battery cell during normal use.

[0078] Please refer to Figure 3 In some embodiments, the housing 10 includes a top cover 13, and the top cover 13 includes a wall portion 10a.

[0079] It can be understood that the top cover 13 is a cover part in the outer shell 10 , which is used to cover the shell to form an accommodating space for accommodating the electrode assembly 40 .

[0080] A pressure relief mechanism is also often provided at the top cover 13 , and therefore, a corresponding air gap is required between the top cover 13 and the electrode assembly 40 to increase the probability of thermal runaway gas being discharged from the pressure relief mechanism to the outside.

[0081] Here, the wall portion 10 a is an inner wall of the top cover 13 facing the electrode assembly 40 .

[0082] Meanwhile, the insulating member may be a lower plastic located between the top cover 13 and the electrode assembly 40 .

[0083] Thus, by disposing the connecting member 30 between the top cover 13 and the lower plastic, the probability of the lower plastic and the top cover 13 being separated is reduced, and the probability of the bracket 11 falling off from the receiving groove 20 a is also reduced.

[0084] Please refer to Figure 8 In some embodiments, the connecting member 30 has a first end 30 a connected to the insulating member 20 and a second end 30 b connected to the top cover 13 .

[0085] It can be understood that the first end 30a of the connector 30 refers to the end facing the insulating member 20, and the second end 30b of the connector 30 refers to the end facing the top cover 13. For example, when the connector 30 is a columnar structure, the first end 30a and the second end 30b are two opposite ends of the columnar structure; or, when the connector 30 is a block structure, the first end 30a and the second end 30b are two opposite ends of the block structure; or, when the connector 30 is a plate structure, the first end 30a and the second end 30b are two opposite ends of the plate structure.

[0086] The connection method between the first end 30a and the insulating member 20 includes, but is not limited to, integral molding, welding, bonding, plug-in, clamping, and threaded connection.

[0087] The second end 30 b and the top cover 13 are connected in various ways, including welding, bonding, plugging, clamping, and threaded connection.

[0088] For example, the connector 30 is a columnar structure, and the connector 30 is made of thermoplastic plastic. Then, the first end 30a and the insulating member 20 can be connected by hot melt bonding or integral molding, and the second end 30b and the top cover 13 can be connected by bonding or clamping.

[0089] For example, the connector 30 is a block structure, and the connector 30 is made of metal. Then, the first end 30a and the insulating member 20 can be connected by bonding, plugging or snapping, and the second end 30b and the top cover 13 can be connected by welding or threading.

[0090] In this way, a suitable connection method can be selected according to the specific shape and material of the connector 30 to improve the adaptability of the first end 30a and the second end 30b of the connector 30 to be connected to the insulating member 20 and the top cover 13 respectively.

[0091] Please refer to Figure 5 , Figure 7 and Figure 8 In some embodiments, the connecting member 30 includes a hot melt member, and the first end 30a of the hot melt member is integrally formed with the insulating member 20; or, the second end 30b of the hot melt member is hot-melt connected to the top cover 13; or, the first end 30a of the hot melt member is integrally formed with the insulating member 20, and, the second end 30b of the hot melt member is hot-melt connected to the top cover 13.

[0092] It can be understood that the hot melt component refers to a material that can become liquid at a certain temperature, for example, the material of the hot melt component can be hot melt adhesive, polyethylene, polypropylene, polyvinyl chloride, etc. When the insulating member 20 is made of the same material as the hot melt component, the hot melt component can be manufactured together with the insulating member 20, that is, the two are integrally formed into a whole.

[0093] Hot melt connection means that after the second end 30b of the hot melt is heated to a certain temperature, the second end 30b is in a molten state and connected to the top cover 13, and the plasticity or adhesion of the second end 30b after melting is improved to connect to the top cover 13.

[0094] For example, after the second end 30b of the hot melt is heated to a molten state, it directly abuts against the surface of the top cover 13, and is connected to the top cover 13 by utilizing the adhesiveness of the second end 30b in the process of changing from a molten state to a solid state; or, correspondingly, a blind hole, a step hole or an inverted cone hole can be opened on the top cover 13, and the molten second end 30b extends into the corresponding hole.

[0095] In this way, the first end 30a of the hot melt is connected to the insulating member 20, and the second end 30b of the hot melt is connected to the top cover 13, and the overall process is simpler and has fewer steps.

[0096] In some embodiments, in the thickness direction of the top cover 13 , the projection area of ​​the second end 30 b is larger than the projection area of ​​the first end 30 a .

[0097] It can be understood that the connecting member 30 has a structural feature of having one end larger than the other end.

[0098] For example, when the connecting member 30 is a columnar structure, the outer diameter of the first end 30a of the connecting member 30 is small, and the outer diameter of the second end 30b of the connecting member 30 is large, and its outer diameter can increase linearly from the first end 30a to the second end 30b, so that the connecting member 30 as a whole is similar to a cone, or its outer diameter can be non-increasing from the first end 30a to the second end 30b, so that the connecting member 30 as a whole is similar to a step structure.

[0099] For example, when the connecting member 30 is a block-shaped structure, the surface area of ​​the first end 30 a of the connecting member 30 is small, and the surface area of ​​the second end 30 b of the connecting member 30 is large.

[0100] In this way, the contact area between the second end 30b and the top cover 13 is greater than the contact area between the first end 30a and the insulating member 20, especially when the material of the connecting member 30 is the same as that of the insulating member 20, the connection strength and reliability between the second end 30b and the top cover 13 can be further improved.

[0101] Please refer to Figure 8 In some embodiments, a step hole 12 is formed on the top cover 13 , and the second end 30 b is connected to the step hole 12 by hot melting.

[0102] It can be understood that the stepped hole 12 is a hole structure with a small hole opening and a large inner diameter.

[0103] When in the molten state, the second end 30b has good plasticity. At this time, the second end 30b of the connector 30 is placed in the step hole 12, and the flowing second end 30b can fill the step hole 12. Then, after cooling to room temperature, the second end 30b is snap-connected with the step hole 12 to further improve the connection strength and reliability between the second end 30b and the top cover 13.

[0104] In some embodiments, there are multiple connecting members 30 , and each connecting member 30 is disposed around the outer circumference of the receiving groove 20 a .

[0105] It can be understood that the number of the connecting members 30 should be more than two.

[0106] Each connecting member 30 is disposed around the outer periphery of the receiving groove 20 a , that is, each connecting member 30 is distributed on the outer periphery of the receiving groove 20 a .

[0107] For example, when the groove profile of the accommodating groove 20a is square, a connecting member 30 can be set in the peripheral area corresponding to each groove wall of the accommodating groove 20a, or a connecting member 30 can be set in the peripheral area corresponding to two opposite groove walls, or each connecting member 30 can be set only in the peripheral area corresponding to one of the groove walls of the accommodating groove 20a.

[0108] For example, when the groove profile of the receiving groove 20 a is circular, a plurality of connecting members 30 may be disposed in the peripheral area corresponding to the arc-shaped groove wall of the receiving groove 20 a.

[0109] When the top cover 13 is covered on the receiving groove 20a to form a cavity, the bracket 11 is placed in the cavity, and the connecting parts 30 are arranged around the outer periphery of the receiving groove 20a. This can reduce the probability that the top cover 13 is separated from the insulating part 20 due to external force and the receiving groove 20a is exposed, thereby reducing the risk of the bracket 11 being exposed or slipping out of the receiving groove 20a.

[0110] Please refer to Figure 6 and Figure 7In some embodiments, the insulating member 20 is a square insulating member, a receiving groove 20 a is provided at the wide side end of the square insulating member 20 , and each connecting member 30 is arranged on opposite sides of the bracket 11 along the width direction of the square insulating member.

[0111] It can be understood that the square insulating member 20 has two wide side ends and two long side ends that are arranged opposite to each other. Opening the accommodating groove 20a at the wide side end of the insulating member 20 means that after thermal runaway occurs, the bracket 11 can be supported between the outer wall of the electrode assembly 40 and the inner wall of the shell to form a corresponding side wall cavity for the spray valve gas to flow to the pressure relief mechanism. At the same time, the side wall corresponding to the wide side end of the square insulating member 20 is also the main connection with the insulating film layer of the electrode assembly 40. Under the pulling effect of the self-weight of the electrode assembly 40, the top cover 13 is easily separated from the square insulating member 20, thereby exposing the bracket 11 in the accommodating groove 20a. Therefore, a plurality of connectors 30 are arranged along the width direction of the square insulating member 20.

[0112] For example, the number of the connecting members 30 may be two, and the two connecting members 30 are respectively arranged on opposite sides of the bracket 11. According to the specific force conditions, the two connecting members 30 may be symmetrically arranged about the geometric center of the bracket 11. Of course, the two connecting members 30 may also be asymmetrically arranged about the geometric center of the bracket 11. Alternatively, when there are multiple connecting members 30, the connecting members 30 may be evenly distributed on opposite sides of the bracket 11, or unequally distributed on opposite sides of the bracket 11.

[0113] In this way, by arranging each connecting member 30 along the width direction of the square insulating member 20 and arranging them on opposite sides of the bracket 11, the connection strength between the top cover 13 and the wide side end of the square insulating member 20 is increased, thereby reducing the probability of the bracket 11 being exposed or slipping out of the accommodating groove 20a.

[0114] Please refer to Fig. 9 In some embodiments, the center line A of the position where the bracket 11 is connected to the top cover 13 coincides with the line B connecting the center points of each connecting member 30 .

[0115] It can be understood that the position center line A where the bracket 11 and the top cover 13 are connected is the center line of the portion where the bracket 11 and the top cover 13 are in contact along the length direction of the top cover 13. For example, when the portion where the bracket 11 and the top cover 13 are connected is a square, the position center line A is the center line along the length direction of the top cover 13; or, when the portion where the bracket 11 and the top cover 13 are connected is a circle, the position center line A is the center line passing through the center of the circle.

[0116] The center point of the connecting member 30 refers to the center point of the portion where the connecting member 30 is connected to the top cover 13. For example, when the connecting member 30 is a columnar structure, the center point is the center point of the columnar structure; or, when the connecting member 30 is a block structure, the center point is the center point of the block structure.

[0117] The coincidence of the position center line A where the bracket 11 and the top cover 13 are connected with the line B connecting the center points of the connecting members 30 also means that the center points of the connecting members 30 fall on the extension line of the position center line.

[0118] In this way, the arrangement position of each connecting member 30 can increase the connection strength between the top cover 13 and the insulating member 20 , so as to reduce the probability of the bracket 11 being exposed from the receiving groove 20 a .

[0119] Please refer to Figure 7 In some embodiments, the distance between the center points of the two connecting members 30 closest to the bracket 11 is L1, the length of the bracket 11 is L2, and the range of L1 / L2 is 1.2-5.

[0120] It can be understood that the connecting member 30 closest to the bracket 11 refers to the connecting member 30 that is shortest from the geometric center of the bracket 11, and the length of the line connecting the center points of the two connecting members 30 is L1.

[0121] The length of the bracket 11 is the length of the bracket 11 extending in the width direction of the square insulating member 20 .

[0122] The range of L1 / L2 can be 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0, etc.

[0123] In this way, the appropriate location of the connector 30 is selected according to the length of the bracket 11 to improve the connection stability between the top cover 13 and the insulating member 20 , thereby reducing the probability of the bracket 11 escaping from the receiving groove 20 a.

[0124] In some embodiments, L1 / L2 ranges from 2 to 3.

[0125] It can be understood that the range of L1 / L2 can be 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, etc.

[0126] In this way, the connection stability between the top cover 13 and the insulating member 20 can be improved by further optimizing the ratio range of L1 / L2 .

[0127] In some embodiments, the connector 30 is a columnar structure, and the diameter of the connector 30 is 1.5 mm to 3 mm.

[0128] It can be understood that the diameter of the connecting member 30 can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3.0mm.

[0129] In this way, the connecting member 30 with a columnar structure is easier to process and easier to be integrally formed with the insulating member 20 .

[0130] Please refer to Figure 5 , Figure 7 , Figure 8 and Fig. 9 In a specific embodiment, the battery cell 100 includes a housing 10, an insulating member 20 and a connecting member 30. The housing 10 is provided with a bracket 11, the insulating member 20 is formed with a receiving groove 20a, the housing 10 covers the receiving groove 20a, and the bracket 11 is placed in the receiving groove 20a; the connecting member 30 is used to connect the housing 10 and the insulating member 20, wherein, along a first direction X, the projection of the connecting member 30 falls within the range of the bracket 11, and the first direction X is the width direction of the wall portion 11a.

[0131] Specifically, the insulating member 20 is a square insulating member 20, and the connecting member 30 is a hot melt member. A receiving groove 20a is provided at each wide side end of the square insulating member 20. There are four hot melt members, and each two hot melt members form a group. Each two hot melt members are arranged on opposite sides of the bracket 11 along the width direction of the square insulating member 20. A step hole 12 is formed on the outer shell 10. One end of the hot melt member is integrally formed with the insulating member 20, and the other end of the hot melt member is hot-melted and connected to the step hole 12. The center line of the position where the bracket 11 is connected to the outer shell 10 coincides with the line connecting the center points of the corresponding two hot melt members. The distance between the center points of the two hot melt members closest to the bracket 11 is L1, the length of the bracket 11 is L2, and the range of L1 / L2 is 2 to 3. The hot melt member has a columnar structure, and the diameter of the hot melt member is 1.5 mm to 3 mm.

[0132] In this way, the material of the hot melt component is the same as or close to that of the insulating component 20, that is, the hot melt component can be integrally formed with the insulating component 20, thereby improving the connection strength between the hot melt component and the insulating component 20. At the same time, the hot melt component and the housing 10 are connected by hot melt, and the process is relatively simple and easy to operate. In addition, the hot melt components are symmetrically arranged on the opposite sides of the bracket 11, and the corresponding position distance relationship is limited, which can further improve the connection stability between the housing 10 and the insulating component 20 and reduce the probability of the bracket 11 being exposed or detached from the receiving groove 20a.

[0133] In a second aspect, an embodiment of the present application further provides a battery 3000 , comprising the above-mentioned battery cell 100 .

[0134] In a third aspect, an embodiment of the present application further provides an electrical device 10000 , comprising the above-mentioned battery 3000 .

[0135] It can be understood that the beneficial effects of the second and third aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here.

[0136] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cell, characterized in that: include: a housing, the housing comprising a wall portion; an electrode assembly, the electrode assembly being accommodated in the housing; An insulating member, the insulating member is disposed between the electrode assembly and the wall portion, and the insulating member includes a receiving groove; A bracket, the bracket being arranged in the receiving groove; A connecting member, through which the insulating member is connected to the wall portion; Wherein, along a first direction, a projection of the connecting member falls within the range of the bracket, and the first direction is a width direction of the wall portion.

2. The battery cell according to claim 1, characterized in that: The housing includes a top cover, and the top cover includes the wall portion.

3. The battery cell according to claim 2, characterized in that: The connecting member has a first end connected to the insulating member and a second end connected to the top cover.

4. The battery cell according to claim 3, characterized in that: The connecting member comprises a hot melt member, the first end of the hot melt member is integrally formed with the insulating member; and / or the second end of the hot melt member is hot-melt connected to the top cover.

5. The battery cell according to claim 3, characterized in that: In the thickness direction of the top cover, a projection area of ​​the second end is larger than a projection area of ​​the first end surface.

6. The battery cell according to claim 4, characterized in that: A step hole is formed on the top cover, and the second end is hot-melt connected to the step hole.

7. The battery cell according to any one of claims 2 to 6, characterized in that: There are multiple connecting members, and each connecting member is arranged around the outer periphery of the containing groove.

8. The battery cell according to claim 7, characterized in that: The insulating member is a square insulating member, the accommodating groove is provided at the wide side end of the square insulating member, and each of the connecting members is arranged on opposite sides of the bracket along the width direction of the square insulating member.

9. The battery cell according to claim 8, characterized in that: The center line of the position where the bracket is connected to the top cover coincides with the line connecting the center points of each of the connecting members.

10. The battery cell according to claim 9, characterized in that: The distance between the center points of the two connecting members closest to the bracket is L1, the length of the bracket is L2, and the range of L1 / L2 is 1.2-5.

11. The battery cell according to claim 10, characterized in that: The range of L1 / L2 is 2-3.

12. The battery cell according to any one of claims 4 to 6 and 8 to 11, characterized in that: The connecting piece is in a columnar structure, and the diameter of the connecting piece is 1.5 mm to 3 mm.

13. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 12.

14. An electrical equipment, characterized in that: Comprising the battery of claim 13.

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