Battery monomer, battery device and electric equipment

Abstract

The utility model discloses a battery monomer, a battery device and electric equipment, the battery monomer comprises a shell, an electrode terminal electrode assembly and an insulating assembly, the shell comprises a plurality of side walls, the plurality of side walls define an accommodating space, the plurality of side walls comprise a first side wall and a second side wall, the first side wall and the second side wall are oppositely arranged along a first direction, and the first direction is opposite to the second direction. The first side wall is provided with an electrode terminal, the electrode assembly is arranged in the containing space, the end, facing the first side wall, of the electrode assembly comprises a tab electrically connected with the electrode terminal, the insulation assembly is arranged in the containing space and arranged between the first side wall and the electrode assembly, and the insulation assembly comprises a first insulation part. The first insulating part and the tab are arranged along a second direction and are propped against the electrode assembly, and the first direction is intersected with the second direction. And the first insulating parts and the tabs are arranged in the second direction, and the first insulating parts and the tabs respectively support the electrode assembly, so that the stress of the electrode assembly is balanced, and the condition of deflection caused by unbalanced stress is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and particularly to a battery cell, a battery device and an electrical equipment. Background Art

[0002] With the development of new energy, more and more fields use new energy as power. Due to the advantages of high energy density, rechargeable, safe and environmentally friendly, battery devices are widely used in new energy vehicles, consumer electronics, energy storage systems and other fields.

[0003] In the related art, a battery device includes a battery cell. The battery cell includes a housing and an electrode assembly. The electrode assembly is disposed in the internal space of the housing. However, the electrode assembly is prone to skew due to uneven force, and the skew of the electrode assembly is not conducive to improving the safety of the battery cell. Summary of the Utility Model

[0004] In view of the above problems, the present application provides a battery cell, a battery device and an electrical equipment, which solve the problem that the electrode assembly is prone to skew due to uneven force.

[0005] A first aspect of the present application provides a battery cell, which includes:

[0006] A housing, the housing includes a plurality of side walls, the plurality of side walls enclose an accommodation space, the plurality of side walls include a first side wall and a second side wall, and the first side wall and the second side wall are oppositely arranged along a first direction;

[0007] An electrode terminal, the electrode terminal is provided on the first side wall;

[0008] An electrode assembly, the electrode assembly is disposed in the accommodation space, and one end of the electrode assembly facing the first side wall includes a tab, and the tab is electrically connected to the electrode terminal;

[0009] An insulating assembly, the insulating assembly is disposed in the accommodation space and is insulatingly arranged between the first side wall and the electrode assembly. The insulating assembly includes a first insulating member. The first insulating member and the tab are arranged along a second direction. The first insulating member abuts against the electrode assembly. Along the second direction, the first insulating member has a first dimension, the tab has a second dimension, and the electrode assembly has a third dimension. Wherein, the sum of the first dimension and the second dimension is greater than zero and less than or equal to the third dimension, and the first direction intersects with the second direction.

[0010] In the present application, the first insulating member and the tab are arranged in the second direction. The first insulating member abuts and limits the electrode assembly. The electrode assembly is on the side with the tab. The first insulating member and the tab respectively support the electrode assembly, so that the electrode assembly is in force balance at the end with the tab, reducing the skewing situation caused by unbalanced force due to unilateral force on the electrode assembly, thereby reducing the short-circuit problem caused by the skewing of the electrode assembly, and further effectively improving the safety performance of the battery cell.

[0011] In some embodiments of the present application, the insulating assembly further includes a second insulating member. The first insulating member is connected to the second insulating member, and at least one of the first insulating member and the second insulating member is connected to the first side wall.

[0012] The insulating assembly includes a connected first insulating member and a second insulating member. With such an arrangement, the processing difficulty of the insulating assembly can be reduced, and the processing efficiency of the insulating assembly is improved.

[0013] In some embodiments of the present application, along the first direction, the electrode assembly has a projection on the second insulating member, and all the projections are within the range of the second insulating member. The first insulating member is connected to the side of the second insulating member facing the electrode assembly. The second insulating member can effectively insulate the electrode assembly from the first side wall, thereby improving the safety performance of the electrode assembly.

[0014] In some embodiments of the present application, the side of the second insulating member facing the electrode assembly includes a support protrusion. Along the third direction, the second insulating member has a middle position, and support protrusions are provided on at least one side of the middle position in the third direction. The support protrusions abut against the electrode assembly. The third direction, the second direction, and the first direction intersect pairwise. By providing support protrusions on the second insulating member and using the support protrusions to support the electrode assembly, the electrode assembly can be effectively limited in the first direction, reducing the situation of the electrode assembly moving around in the first direction, thereby reducing the situation of short circuit caused by the movement of the electrode assembly, and further improving the safety performance of the battery cell.

[0015] In some embodiments of the present application, along the third direction, the distance between the support protrusion and the middle position is a first distance, and the distance between the support protrusion and the edge of the second insulating member is a second distance. The first distance is greater than the second distance. By setting the first distance to be greater than the second distance, the support protrusion is arranged on the side close to the edge of the second insulating member in the third direction. Using the support protrusion to support the electrode assembly makes the supported position of the electrode assembly close to the edge of the electrode assembly in the third direction, reducing the situation of the electrode assembly shaking under force, thereby improving the stability of the electrode assembly.

[0016] In some embodiments of the present application, along the third direction, the support protrusion is flush with the edge of the second insulating member. With this arrangement, the support protrusion can support the edge of the electrode assembly in the third direction, further reducing the situation of the electrode assembly shaking under force and further improving the stability of the electrode assembly.

[0017] In some embodiments of the present application, support protrusions are provided on opposite sides of the middle position along the opposite direction of the third direction, and the two support protrusions are symmetrically arranged with respect to the middle position. The two support protrusions are spaced along the third direction, and the two support protrusions are used to support the electrode assembly, thereby increasing the support positions of the electrode assembly and further improving the stability of the electrode assembly.

[0018] In some embodiments of the present application, the first insulating member includes a first support surface, the support protrusion includes a second support surface, the first support surface and the second support surface are flush, and both the first support surface and the second support surface face the electrode assembly and are respectively in contact with the electrode assembly. The first support surface and the second support surface are respectively used to support the electrode assembly. By setting the first support surface and the second support surface to be coplanar, the height difference between the first support surface and the second support surface in the first direction is reduced, so that both the first insulating member and the second insulating member can effectively support the electrode assembly, further improving the stability of the electrode assembly.

[0019] In some embodiments of the present application, the first insulating member is connected to the support protrusion. The support protrusion protrudes toward the electrode assembly. Connecting the first insulating member to the support protrusion can make the first insulating member closer to the electrode assembly, reduce the volume of the first insulating member in the first direction, and lower the manufacturing cost of the first insulating member.

[0020] In some embodiments of the present application, the support protrusion is provided with a first stepped structure, the top surface of the first stepped structure constitutes the second support surface, a part of the first insulating member is embedded in the position where the first stepped structure is located, the side surface of the first insulating member facing away from the electrode assembly abuts against the bottom surface of the first stepped structure, and at least part of the side surface of the first insulating member facing the electrode assembly constitutes the first support surface. A part of the first insulating member is embedded in the first stepped structure of the support protrusion, and the partial body of the first insulating member is used to supplement the structure of the first stepped structure, so that the first support surface and the second support surface form a coplanar structure, so as to realize the simultaneous support of the electrode assembly by the first insulating member and the second insulating member.

[0021] In some embodiments of the present application, the first insulating member is snap-connected to the support protrusion. The snap-connection method has a simple structure and is convenient for assembly, and can effectively improve the assembly efficiency.

[0022] In some embodiments of the present application, at least one convex structure is provided on the side of the first insulating member facing away from the electrode assembly, and the at least one convex structure is connected to or abuts against the second insulating member. By providing the convex structure, a support is formed between the first insulating member and the second insulating member by using the convex structure, which improves the structural strength of the first insulating member and reduces the occurrence of bending and collapse of the first insulating member.

[0023] In some embodiments of the present application, the battery cell further includes a pressure relief mechanism. The pressure relief mechanism is provided on the first side wall, an exhaust hole is provided on the second insulating member, the exhaust hole is disposed opposite to the pressure relief mechanism, and an avoidance hole is provided on the first insulating member. The avoidance hole is disposed opposite to the exhaust hole and avoids the exhaust hole. With such a setting, the shielding of the pressure relief mechanism by the first insulating member can be reduced to enable the normal opening of the pressure relief mechanism.

[0024] In some embodiments of the present application, the side of the second insulating member facing the electrode assembly further includes a boss structure. An exhaust hole is formed in the boss structure, a second step structure is provided on the side of the boss structure facing the electrode assembly, and the top surface of the second step structure constitutes a part of the second support surface. A part of the first insulating member is embedded in the position where the second step structure is located, and the side of the second insulating member facing away from the electrode assembly abuts against the bottom surface of the second step structure. By using the boss structure to support the first insulating member, the structural strength and stability of the first insulating member can be improved to provide a better support effect for the electrode assembly through the first insulating member.

[0025] In some embodiments of the present application, along the third direction, the boss structure is located in the middle position, and support protrusions are respectively provided at intervals on opposite sides of the boss structure along the third direction. A convex structure is provided between the support protrusion and the boss structure. By providing the convex structure, the structural strength of the first insulating member is improved, and the occurrence of collapse of the first insulating member is reduced.

[0026] In some embodiments of the present application, the convex structure includes a connected cylindrical portion and a rib portion. Along the direction from the support protrusion to the boss structure, the rib portion and the cylindrical portion are arranged in sequence. With such a setting, on the basis of having sufficient support formation, the material usage of the convex structure can be reduced, thereby reducing the manufacturing cost of the first insulating member.

[0027] In some embodiments of the present application, the first insulating member is of an integral structure and extends along the third direction, and the third direction, the second direction, and the first direction intersect pairwise. With such a setting, the processing procedures for the first insulating member can be reduced, and thus the processing efficiency of the first insulating member can be improved.

[0028] In some embodiments of the present application, the first insulating member has a multi-segment structure. The multi-segment structure is arranged in sequence along the third direction, and each segment structure extends along the third direction. The third direction, the second direction, and the first direction intersect pairwise. With such an arrangement, the processing difficulty of the first insulating member can be reduced, and the processing convenience of the first insulating member is improved.

[0029] In some embodiments of the present application, the first insulating member has a one-piece structure and extends along the third direction. Along the third direction, the first insulating member has a first length, and the second insulating member has a second length. The first length is greater than or equal to one-fourth of the second length and less than or equal to the second length. With such an arrangement, the first insulating member can have sufficient length in the third direction to provide sufficient supporting force for the electrode assembly by using the first insulating member, so that the electrode assembly is in force balance and the skew situation of the electrode assembly caused by unbalanced force is reduced.

[0030] In some embodiments of the present application, the first length is greater than or equal to one-half of the second length and less than or equal to the second length. With such an arrangement, it is further ensured that the first insulating member has sufficient length in the third direction to provide sufficient supporting force for the electrode assembly by using the first insulating member, so that the electrode assembly is in force balance and the skew situation of the electrode assembly caused by unbalanced force is reduced.

[0031] In some embodiments of the present application, the first insulating member has a one-piece structure and extends along the third direction, and at least one strengthening structure is provided on the first insulating member. With such an arrangement, the structural strength of the first insulating member can be enhanced by using the strengthening structure, so that the first insulating member can effectively support the electrode assembly, thereby maintaining the force balance of the electrode assembly and reducing the skew of the electrode assembly.

[0032] In some embodiments of the present application, the strengthening structure is a concave structure formed on the side of the first insulating member facing the electrode assembly. By setting the strengthening structure as a concave structure, with such an arrangement, the structure is simple, easy to process, and the manufacturing cost can be effectively reduced.

[0033] In some embodiments of the present application, the sum of the first dimension and the second dimension is greater than or equal to one-half of the third dimension and less than or equal to the third dimension. With such an arrangement, both the tab and the first insulating member have good supporting performance, and further can provide better support for the electrode assembly, so that the stability of the electrode assembly is improved.

[0034] In some embodiments of the present application, along the second direction, the distance between the first insulating member and the tab is greater than or equal to zero and less than the third dimension minus 3 millimeters. With such an arrangement, the first insulating member and the tab can be reasonably arranged in the third direction, and the interference between them is reduced.

[0035] In some embodiments of the present application, the distance between the first insulating member and the tab is greater than or equal to one-fourth of the third dimension and less than one-half of the third dimension. With such a setting, sufficient spacing space can be provided between the first insulating member and the tab in the third direction, further reducing the interference between the first insulating member and the tab.

[0036] In some embodiments of the present application, the housing includes:

[0037] A housing having an opening;

[0038] An end cap connected to the housing and closing the opening. The end cap and the housing enclose a receiving space, and the end cap forms the first side wall.

[0039] The housing is provided as two parts, namely the housing and the end cap, thereby improving the convenience of processing and assembly and effectively enhancing the production efficiency.

[0040] A second aspect of the present application provides a battery device, which includes at least one battery cell assembly. The battery cell assembly includes at least one battery cell, and the battery cell is the battery cell as described above.

[0041] A third aspect of the present application provides an electrical device, which includes the battery device as described above.

[0042] The above description is only an overview of the technical solution of the present application. In order to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other objects, features and advantages of the present application more obvious and understandable, the following specifically describes the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 Schematically shows a structural diagram of a vehicle according to an embodiment of the present application;

[0044] Figure 2 Schematically shows a structural diagram of a battery device according to an embodiment of the present application;

[0045] Figure 3 Schematically shows a structural diagram of a battery cell according to an embodiment of the present application;

[0046] Figure 4 For Figure 3 A cross-sectional view taken along the A-A position of the battery cell shown in

[0047] Figure 5 For Figure 3 A cross-sectional view taken along the B-B position of the battery device shown in

[0048] Figure 6 ForFigure 3 Exploded view schematic diagram of the battery cell shown

[0049] Figure 7 is Figure 6 Partial schematic diagram of the assembly structure of the battery cell shown in [[ ]] (the first insulating member is in some embodiments, and the tab is in an unfolded state);

[0050] Figure 8 is Figure 7 Schematic diagram of the structure of the battery cell shown in [[ ]] where the first insulating member is in an unassembled state;

[0051] Figure 9 is Figure 8 Schematic diagram of the structure of the first insulating member shown in [[ ]];

[0052] Figure 10 is Figure 9 Schematic diagram of another perspective of the structure of the first insulating member shown in [[ ]];

[0053] Figure 11 is Figure 6 Partial schematic diagram of the assembly structure of the battery cell shown in [[ ]] (the first insulating member is in some embodiments, and the tab is in an unfolded state);

[0054] Figure 12 is Figure 11 Schematic diagram of the structure of the battery cell shown in [[ ]] where the first insulating member is in an unassembled state;

[0055] Figure 13 is Figure 12 Schematic diagram of the structure of the first insulating member shown in [[ ]];

[0056] Figure 14 is Figure 13 Schematic diagram of another perspective of the structure of the first insulating member shown in [[ ]];

[0057] Figure 15 is Figure 14 Schematic diagram of another perspective of the structure of the first insulating member shown in [[ ]].

[0058] Reference numerals are as follows:

[0059] 1000, vehicle;

[0060] 100, battery device; 200, controller; 300, motor;

[0061] 110, battery cell assembly;

[0062] 10, battery cell;

[0063] 11. Outer shell; 111. End cap; 1111. Liquid injection hole; 112. Housing; 113. First side wall; 114. Second side wall; 12. Electrode terminal; 13. Electrode assembly; 131. Tab; 14. Insulating assembly; 141. First insulating member; 1411. Snap projection; 1412. Projection structure; 14121. Cylindrical portion; 14122. Rib portion; 1413. Avoidance hole; 1414. First support surface; 1415. Reinforcing structure; 142. Second insulating member; 1421. Support projection; 1422. Second support surface; 1423. First step structure; 1424. Boss structure; 1425. Exhaust hole; 1426. Second step structure; 1427. Snap hole; 15. Pressure relief mechanism; 16. Top patch; 17. Sealing member; 18. Current collecting member; 19. Insulating film; 191. Bottom patch; 192. Liquid injection valve;

[0064] 120. Box body;

[0065] 121. First box body; 122. Second box body;

[0066] X. First direction; Y. Second direction; Z. Third direction. Detailed implementation manners

[0067] 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 therefore are only examples and cannot be used to limit the protection scope of the present application.

[0068] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0069] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means more than two unless otherwise specifically defined.

[0070] References to "embodiments" in this specification mean that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive of other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0071] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0072] In the description of the embodiments of the present application, the term "plural" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0073] 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 therefore should not be construed as a limitation on the embodiments of the present application.

[0074] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can 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] At present, from the perspective of the development of the market situation, the application of battery devices is becoming more and more extensive. Battery devices are not only applied to energy storage power systems such as hydraulic power plants, thermal power plants, wind power plants, and solar power plants, but also widely applied to electric transportation means such as electric bicycles, electric motorcycles, and electric vehicles, as well as multiple fields such as aerospace. With the continuous expansion of the application fields of battery devices, the market demand for them is also continuously increasing.

[0076] In related technologies, a battery device includes battery cells. Each battery cell includes a housing and an electrode assembly. The electrode assembly is disposed in the internal space of the housing. However, due to uneven force, the electrode assembly is prone to skew, and the skew of the electrode assembly is not conducive to improving the safety of the battery cell.

[0077] In this application, a battery cell includes a housing, an electrode terminal, an electrode assembly, and an insulating assembly. The housing includes a plurality of side walls. The plurality of side walls enclose an accommodation space. The plurality of side walls include a first side wall and a second side wall. The first side wall and the second side wall are oppositely arranged along a first direction. An electrode terminal is provided on the first side wall. The electrode assembly is disposed in the accommodation space. One end of the electrode assembly facing the first side wall includes a tab. The tab is electrically connected to the electrode terminal. The insulating assembly is disposed in the accommodation space and is insulatingly arranged between the first side wall and the electrode assembly. The insulating assembly includes a first insulating member. Along a second direction, the first insulating member and the tab are arranged in a row. The first insulating member abuts against the electrode assembly. The first direction intersects with the second direction. The first insulating member and the tab are arranged in a row in the second direction. The first insulating member abuts against and limits the electrode assembly. On the side of the electrode assembly with the tab, the first insulating member and the tab respectively support the electrode assembly, so that the electrode assembly is in a balanced force at the end with the tab, reducing the skew caused by the unbalanced force on one side of the electrode assembly due to unilateral force, thereby reducing the short-circuit problem caused by the skew of the electrode assembly, and further effectively improving the safety performance of the battery cell.

[0078] The technical solutions described in the embodiments of this application are not only limited to the devices described above, but can also be applied to all devices using battery devices. However, for the sake of simplicity of description, the following embodiments are described by taking electric vehicles as examples.

[0079] For example, as Figure 1As shown in the figure, it is a schematic structural diagram of a vehicle according to an embodiment of the present application. The vehicle 1000 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, an extended-range vehicle, etc. A motor 300, a controller 200, and a battery device 100 can be arranged inside the vehicle 1000. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be arranged at the bottom, the front end, or the rear end of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000 and used for the circuit system of the vehicle 1000, such as the power consumption requirements for starting, navigation, and running of the vehicle 1000. In another embodiment of the present application, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0080] The battery device 100 (Battery Apparatus) mentioned in the embodiments of the present application may include one or more battery cell assemblies 110 for providing voltage and capacity. The battery cell assembly 110 (Battery Cell Assembly) may include a plurality of battery cells 10, and the plurality of battery cells 10 are connected in series, parallel, or in a hybrid connection through a busbar component.

[0081] In some embodiments, the battery cell assembly 110 (Battery Cell Assembly) is usually formed by arranging a plurality of battery cells 10.

[0082] As an example, the battery cell assembly 110 can be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery cells 10 into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells 10 with cable ties.

[0083] In some embodiments, as Figure 2 shown, the battery device 100 can be a battery pack (battery Pack), and the battery pack includes a box body 120 and one or more battery cell assemblies 110, and the battery cell assemblies 110 are accommodated in the box body 120.

[0084] As an example, the battery cell assembly 110 can be a battery module, and the battery cell assembly 110 can be accommodated in the box body 120 by fixing the battery module in the box body 120.

[0085] As an example, the battery cell assembly 110 can also be accommodated in the box body 120 by directly fixing a plurality of battery cells 10 in the box body 120.

[0086] As an example, the housing 120 may include a first housing 121 and a second housing 122. The first housing 121 and the second housing 122 are snapped together so that a closed space is formed inside the housing 120 to accommodate the battery cell assembly 110. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first housing 121 can be a top cover or a bottom plate.

[0087] As an example, the housing 120 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the housing 120 to accommodate the battery cell assembly 110.

[0088] In some embodiments, the housing 120 can be part of the chassis structure of the vehicle 1000. For example, a part of the housing 120 can become at least a part of the floor of the vehicle 1000, or a part of the housing 120 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0089] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using the battery cell 10, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0090] In some embodiments of the present application, the battery cell 10 can be a secondary battery, which refers to a battery cell 10 that can be activated by charging after discharging so as to continue to be used.

[0091] The battery cell 10 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application do not limit this.

[0092] In some embodiments of the present application, the battery cell 10 includes a housing, a pressure relief mechanism, an electrode assembly, and an insulating member. The housing includes a plurality of side walls, and the plurality of side walls include a first side wall. A pressure relief mechanism is provided on the first side wall. The pressure relief mechanism is configured to open or close according to whether the internal pressure of the housing reaches a pressure threshold. The electrode assembly is disposed inside the housing. The insulating member is disposed inside the housing and between the housing and the electrode assembly for insulating and isolating the housing and the electrode assembly. The insulating member abuts against the electrode assembly.

[0093] As an example, the battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc. The present application has no special limitation.

[0094] The electrode assembly includes a positive electrode, a negative electrode, and a separator, and the separator is disposed between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell 10, active ions (such as lithium ions) are inserted into and extracted from between the positive electrode and the negative electrode back and forth. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and at the same time allow the active ions to pass through.

[0095] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0096] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0097] As an example, the positive electrode current collector can be made of a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, pure metals, alloys, and metals with surface treatment can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver, etc. The composite current collector may include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as substrates of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0098] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but not limited to lithium iron phosphate (such as LiFePO 4 (which can also be abbreviated as LFP)), composites of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), composites of lithium manganese phosphate and carbon, lithium manganese iron phosphate, composites of lithium manganese iron phosphate and carbon, etc. Examples of lithium transition metal oxides may include but not limited to lithium cobalt oxide (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 , LiMn 2 O 4 ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3O 2 (which can also be abbreviated as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O 2 (which can also be abbreviated as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O 2 (which can also be abbreviated as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O 2 (which can also be abbreviated as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O 2 (which can also be abbreviated as NCM 811 )、lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05 O 2 ) and at least one of its modified compounds, etc. The modified compound refers to a substance obtained by modification means such as doping or coating on the basis of the above substances.

[0099] In some embodiments, the positive electrode may adopt a foam metal. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. When the foam metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foam metal, and of course, the positive electrode active material may also be provided. As an example, the positive electrode active material is filled and / or deposited in the foam metal.

[0100] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0101] As an example, the negative electrode current collector can adopt a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, pure metal, alloy, and metal with surface treatment can be adopted, including but not limited to stainless steel, copper, aluminum, nickel, titanium or silver, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0102] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0103] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0104] As an example, the negative electrode active material can be the negative electrode active material known in the art for the battery cell 10. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material can be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as the negative electrode active material of the battery cell 10 can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0105] In some embodiments, the negative electrode can be made of a foam metal. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. When the foam metal is used as the negative electrode sheet, the negative electrode active material may not be provided on the surface of the foam metal, and of course, the negative electrode active material can also be provided.

[0106] As an example, the negative electrode active material can be filled or / and deposited in the negative electrode current collector.

[0107] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0108] In some embodiments, the electrode assembly further includes a separator, and the separator is disposed between the positive electrode and the negative electrode.

[0109] In some embodiments, the separator is a separator membrane. The present application has no particular limitation on the type of the separator membrane, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0110] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator membrane can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be coated on the surface of the separator membrane.

[0111] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transfer ions and isolate the positive and negative electrodes simultaneously.

[0112] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0113] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0114] In some embodiments, the electrode assembly is a stacked structure.

[0115] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be respectively provided, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0116] As an example, multiple positive electrode sheets can be provided, and the negative electrode sheet is folded to form multiple stacked folding segments, and a positive electrode sheet is clamped between adjacent folding segments.

[0117] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple stacked folding segments.

[0118] As an example, multiple separators can be provided and are respectively disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0119] As an example, the separators can be continuously provided and are disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0120] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, prismatic, etc.

[0121] In some embodiments, the electrode sheets of the electrode assembly are provided with tabs, and the tabs can conduct the current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0122] In some embodiments, a pressure relief mechanism is provided on the outer casing. The pressure relief mechanism is used to discharge the internal gas of the battery cell 10.

[0123] As an example, it is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 10 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 10 reaches a predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is damaged, thereby forming an opening or a channel for the internal pressure or temperature to be released. This threshold design varies according to different design requirements. The threshold may depend on one or several materials among the positive electrode sheet, the negative electrode sheet, the electrolyte, and the separator in the battery cell 10.

[0124] As an example, the pressure relief mechanism can be integrally formed with the outer casing.

[0125] As an example, the pressure relief mechanism can also be separately provided and connected to the outer casing.

[0126] As used herein, "actuation" means that the pressure relief mechanism generates an action or is activated to a certain state, so that the internal pressure and temperature of the battery cell 10 can be released. The actions generated by the pressure relief mechanism may include, but are not limited to: components in the pressure relief mechanism move to form an exhaust passage, at least a part of the pressure relief mechanism breaks, shatters, is torn or opened, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell 10 will be discharged outward from the actuated part as emissions. In this way, the battery cell 10 can be depressurized and cooled at a controllable pressure or temperature, thereby reducing the occurrence of potential more serious accidents.

[0127] In some embodiments, when the outer casing is a non-sealed structure, the pressure relief mechanism can be provided as a through hole for discharging the gas inside the battery cell 10.

[0128] The emissions from the battery cell 10 as used herein include, but are not limited to: electrolytes, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0129] The positive electrode tab and the negative electrode tab can be led out from the same end of the electrode plate, or can be respectively led out from the opposite ends of the electrode plate.

[0130] The structures of the positive electrode tab and the negative electrode tab can be the same or different. Taking the positive electrode tab as an example, the positive electrode tab can include a plurality of positive electrode tab layers, and the plurality of positive electrode tab layers are stacked together to form the positive electrode tab. The positive electrode tab can include at least two parts, one part is located between the main body part of the electrode plate and the insulating member, and the other part is located between the insulating member and the electrode lead-out member.

[0131] The insulating member can insulate at least part of the tab from the end face of the main body part, so that when the battery cell 10 is affected by external impacts, vibrations, etc., the risk of the tab being inserted into the main body part can be reduced, thereby reducing the risk of short circuit of the battery cell 10, which is beneficial to improving the reliability of the battery cell 10.

[0132] The insulating member can be an integral structure or a split structure. As an example, the insulating member is formed by connecting a plurality of independently formed parts. As another example, the insulating member is integrally formed by stamping.

[0133] For example, the insulating member is a plastic part, and the insulating member that is a plastic part is integrally formed by injection molding. The plastic part is convenient to process and has a low manufacturing cost.

[0134] In some embodiments of the present application, the outer casing includes a housing and an end cap. The housing has an opening, and the end cap is connected to the housing and closes the opening. The end cap constitutes the first side wall, and the pressure relief mechanism is provided on the end cap.

[0135] In some embodiments of the present application, the outer casing can be a steel casing, an aluminum casing, a plastic casing (such as polypropylene), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the outer casing can be a sealed structure or a non-sealed structure. As an example, when the outer casing is a non-sealed structure, the outer casing serves to protect the electrode assembly, and a sealing bag is further included between the outer casing and the electrode assembly. The sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the outer casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be provided with one or more openings. The end cap can also be provided with one or more.

[0136] In addition, the connection manner between the end cap and the housing includes but is not limited to snap connection, bonding, welding, or connection through a connecting member.

[0137] In some embodiments of the present application, the battery cell 10 further includes an electrode terminal, and the electrode terminal is provided on the end cap and electrically connected to the electrode assembly. The electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collector member. The electrode terminal can be provided on the end cap or on the housing. In the embodiment shown in the present application, the electrode terminal is provided on the end cap.

[0138] As Figures 2 to 15 shown, in some embodiments of the present application, a battery cell 10 is proposed. The battery cell 10 includes an outer casing 11, an electrode terminal 12, an electrode assembly 13, and an insulating assembly 14. The outer casing 11 includes a plurality of side walls, and the plurality of side walls enclose an accommodation space. The plurality of side walls include a first side wall 113 and a second side wall 114. The first side wall 113 and the second side wall 114 are oppositely arranged along the first direction X. The electrode terminal 12 is provided on the first side wall 113. The electrode assembly 13 is provided in the accommodation space. One end of the electrode assembly 13 facing the first side wall 113 includes a tab 131. The tab 131 is electrically connected to the electrode terminal 12. The insulating assembly 14 is provided in the accommodation space and is insulatingly arranged between the first side wall 113 and the electrode assembly 13. The insulating assembly 14 includes a first insulating member 141. Along the second direction Y, the first insulating member 141 and the tab 131 are arranged. The first insulating member 141 abuts against the electrode assembly 13. The first direction X intersects with the second direction Y.

[0139] Specifically, the multiple side walls forming the outer shell 11 are connected to each other and enclose an accommodation space. Among them, the outer shape of the outer shell 11 enclosed by the multiple side walls can be cylindrical, prismatic, or the like. The accommodation space is isolated from the outside world, and the shape of the accommodation space can be the same as or different from the outer shape of the outer shell 11.

[0140] The electrode assembly 13 is disposed inside the accommodation space. Among the multiple side walls, the first side wall 113 and the second side wall 114 are oppositely disposed in the first direction X. The electrode terminal 12 is mounted on the first side wall 113 and electrically connected to the tab 131 of the electrode assembly 13. The insulating assembly 14 is disposed between the electrode assembly 13 and the first side wall 113, and the insulating assembly 14 is used to insulate the first side wall 113 from the electrode assembly 13 to reduce the situation where the first side wall 113 is charged.

[0141] The tab 131 is disposed on the side of the electrode assembly 13 facing the first side wall 113. Along the second direction Y, the tab 131 is disposed on one side of the electrode assembly 13. The tab 131 includes a positive tab 131 and a negative tab 131. The positive tab 131 and the negative tab 131 are spaced apart along the third direction Z. The electrode terminal 12 includes a positive electrode terminal 12 and a negative electrode terminal 12. The positive electrode terminal 12 is electrically connected to the positive tab 131, and the negative electrode terminal 12 is electrically connected to the negative tab 131. The first direction X, the second direction Y, and the third direction Z intersect pairwise. For example, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other pairwise.

[0142] Taking the shape of the outer shell 11 as a cuboid as an example, the first direction X can be the height direction of the outer shell 11, the second direction Y can be the width direction of the outer shell 11, and the third direction Z can be the length direction of the outer shell 11.

[0143] Among them, the tab 131 can be a single-layer structure or a multi-layer structure. Taking the tab 131 as a multi-layer structure as an example, the tab 131 is located on one side of the electrode assembly 13 in the second direction Y and is connected to the electrode terminal 12, so that a single-sided support is formed on one side of the electrode assembly 13 in the second direction Y (the side with the tab 131). At this time, if the side of the electrode assembly 13 opposite to the tab 131 in the second direction Y is in an unsupported state, the electrode assembly 13 will be skewed due to unbalanced force. The skewed electrode assembly 13 is prone to being squeezed and short-circuited during use.

[0144] In the present application, the first insulating member 141 and the tab 131 are arranged in the second direction Y. The first insulating member 141 abuts and limits the electrode assembly 13. On the side of the electrode assembly 13 with the tab 131, the first insulating member 141 and the tab 131 respectively support the electrode assembly 13, so that the electrode assembly 13 is in force balance at the end with the tab 131, reducing the skewing of the electrode assembly 13 caused by unbalanced force on one side, thereby reducing the short-circuit problem caused by the skewing of the electrode assembly 13, and effectively improving the safety performance of the battery cell 10.

[0145] It should be noted that a bottom patch 191 is provided at the end of the electrode assembly 13 facing the second side wall 114. The bottom patch 191 is an insulating member, and the bottom patch 191 insulates the electrode assembly 13 from the second side wall 114 to reduce the situation of the second side wall 114 being charged. At the same time, the bottom patch 191 can support the electrode assembly 13.

[0146] At the same time, the outer peripheral side of the electrode assembly 13 (the part of the electrode assembly 13 except for the part facing the first side wall 113 and the second side wall 114) includes an insulating film 19 (such as a mylar film, etc.). The insulating film 19 is used to insulate the electrode assembly 13 from the other side walls of the housing 11 (the insulating film 19 also includes the edge of the bottom patch 191 to improve the insulation of the electrode assembly 13), so as to reduce the situation of the housing 11 being charged.

[0147] In addition, the first insulating member 141 can be a ceramic member, a plastic member or a nylon member. Taking the first insulating member 141 as a plastic member as an example, it can be processed by injection molding, which can improve the processing convenience and effectively reduce the manufacturing cost.

[0148] In addition, as Figure 6 shown, a liquid injection hole 1111 is provided on the first side wall 113. A liquid injection valve 192 is installed at the position of the liquid injection hole 1111. The electrolyte is injected into the accommodation space of the battery cell 10 at the position of the liquid injection hole 1111. When the electrolyte injection is completed, a plugging member 17 is provided at the position of the liquid injection hole 1111 to close the liquid injection hole 1111. A top patch 16 is provided on the outer surface of the first side wall 113. The top patch 16 is used to isolate a part of the surface of the first side wall 113 from the outside world, so as to reduce the influence of external environment factors (other thermally out-of-control battery cells 10 affecting the current battery cell 10 through the position of the first side wall 113) on the first side wall 113.

[0149] The electrode terminal 12 can be directly electrically connected to the tab 131, or can be electrically connected to the tab 131 through a current collecting member 18.

[0150] In some embodiments of the present application, as Figures 4 to 8 , andFigure 11 and Figure 12 As shown in Figure 12 , the insulation assembly 14 further includes a second insulation member 142. The first insulation member 141 is connected to the second insulation member 142, and at least one of the first insulation member 141 and the second insulation member 142 is connected to the first side wall 113.

[0151] Specifically, the insulation assembly 14 includes a first insulation member 141 and a second insulation member 142. The first insulation member 141 is connected to the second insulation member 142. Along the second direction Y, the first insulation member 141 is arranged side by side with the tab 131 of the electrode assembly 13. After the battery cell 10 is assembled, at least one of the first insulation member and the second insulation member 142 is connected to the first side wall 113, so that the first insulation member 141 and the second insulation member 142 are fixed. Along the second direction Y, the tab 131 and the first insulation member 141 respectively support opposite sides of the electrode assembly 13.

[0152] It should be understood that the first insulation member 141 is connected to the second insulation member 142 (the connection methods include but are not limited to bonding, welding, clamping or connecting through a connecting member, etc.). Among the first insulation member 141 and the second insulation member 142, only the first insulation member 141 can be connected to the first side wall 113, only the second insulation member 142 can be connected to the first side wall 113, or the first insulation member 141 and the second insulation member 142 can be respectively connected to the first side wall 113.

[0153] In addition, among the first insulation member 141 and the second insulation member 142, the connection methods of the insulation member connected to the first side wall 113 include but are not limited to bonding, clamping or connecting through a connecting member, etc.

[0154] In this application, the insulation assembly 14 includes a connected first insulation member 141 and a second insulation member 142. With such a setting, the processing difficulty of the insulation assembly 14 can be reduced, and the processing efficiency of the insulation assembly 14 is improved.

[0155] It should be noted that the material of the second insulation member 142 can be the same as or different from the material of the first insulation member 141. For example, the materials of the second insulation member 142 and the first insulation member 141 are the same, so as to reduce the manufacturing cost of the insulation assembly 14.

[0156] In some embodiments of this application, as Figure 5 shown, along the first direction X, the electrode assembly 13 has a projection on the second insulation member 142, and all the projections are within the range of the second insulation member 142. The first insulation member 141 is connected to the side of the second insulation member 142 facing the electrode assembly 13.

[0157] Specifically, the insulation assembly 14 is disposed within the accommodation space of the housing 11. The insulation assembly 14 is arranged between the first sidewall 113 and the electrode assembly 13. Along the second direction Y, the first insulation member 141 and the tab 131 of the electrode assembly 13 are arranged side by side and the first insulation member 141 forms a support for the electrode assembly 13. The first insulation member 141 is connected to the second insulation member 142.

[0158] The electrode assembly 13 has a projection on the second insulation member 142. That the entire projection is within the range of the second insulation member 142 means that the second insulation member 142 can completely block the electrode assembly 13.

[0159] By using the second insulation member 142, the electrode assembly 13 can be effectively insulated from the first sidewall 113, thereby improving the safety performance of the electrode assembly 13.

[0160] In addition, the first insulation member 141 is connected to the side of the second insulation member 142 facing the electrode assembly 13. After the insulation assembly 14 is assembled, the first insulation member 141 can effectively be arranged side by side with the tab 131 of the electrode assembly 13 along the second direction Y, and at the same time can abut against the electrode assembly 13 and form a support for the electrode assembly 13.

[0161] In some embodiments of the present application, such as Figure 7 and Figure 8 , or Figure 11 and Figure 12 as shown, the side of the second insulation member 142 facing the electrode assembly 13 includes a support protrusion 1421. Along the third direction Z, the second insulation member 142 has a middle position, and at least one side of the middle position in the third direction Z is provided with the support protrusion 1421. The support protrusion 1421 abuts against the electrode assembly 13. The third direction Z, the second direction Y, and the first direction X intersect pairwise.

[0162] Specifically, the support protrusion 1421 is provided on the side surface of the second insulation member 142 facing the electrode assembly 13, and the number of the support protrusions 1421 can be one or more. Among them, in the third direction Z, the second insulation member 142 has a middle position, which is the geometric center of the second insulation member 142. For example, when the second insulation member 142 is rectangular, the position where the diagonals of the rectangle intersect is the middle position.

[0163] At least one of the middle positions of the second insulation member 142 is provided with the support protrusion 1421. With such an arrangement, the support protrusion 1421 is arranged to deviate from the middle position in the third direction Z, and the support protrusion 1421 abuts against the electrode assembly 13 to form a support for the electrode assembly 13.

[0164] A support protrusion 1421 is provided on the second insulating member 142, and the support protrusion 1421 is used to support the electrode assembly 13, so that the electrode assembly 13 can be effectively limited in the first direction X, reducing the situation of the electrode assembly 13 moving in the first direction X. Thus, the situation of short circuit caused by the movement of the electrode assembly 13 is reduced, and the safety performance of the battery cell 10 is further improved.

[0165] It should be understood that along the third direction Z, the edge of the electrode assembly 13 is prone to skew due to force. The support protrusion 1421 is arranged deviating from the middle position, so that the abutting position of the support protrusion 1421 and the electrode assembly 13 is closer to the edge of the electrode assembly 13 along the third direction Z. Thereby, the support performance for the electrode assembly 13 can be improved, and further the stability of the electrode assembly 13 is improved.

[0166] It should be noted that the support protrusion 1421 can be a solid structure or a hollow structure. For example, the support protrusion 1421 is a hollow structure, which can reduce the material used for the second insulating member 142, reduce the manufacturing cost of the insulating assembly 14, and at the same time reduce the weight of the second insulating member 142.

[0167] In addition, the support protrusion 1421 and the second insulating member 142 can be an integral structure or a split structure. For example, when the support protrusion 1421 and the second insulating member 142 are an integral structure, they are processed and manufactured by an integral forming method (casting, die-casting or injection molding).

[0168] In addition, both the support protrusion 1421 and the first insulating member 141 support the electrode assembly 13. The second insulating member 142 is arranged at an interval from the electrode assembly 13. The interval space between the second insulating member 142 and the electrode assembly 13 is used to accommodate the pole piece (the pole piece in a folded state) and other components, etc., to meet the component installation requirements of the battery cell 10.

[0169] In some embodiments of the present application, such as Figure 7 and Figure 8 , or Figure 11 and Figure 12 as shown, along the third direction Z, the distance between the support protrusion 1421 and the middle position is a first distance, and the distance between the support protrusion 1421 and the edge of the second insulating member 142 is a second distance. The first distance is greater than the second distance.

[0170] Specifically, by setting the first distance to be greater than the second distance, the support protrusion 1421 is arranged closer to the edge side of the second insulating member 142 in the third direction Z. The electrode assembly 13 is supported by the support protrusion 1421, so that the supported position of the electrode assembly 13 is arranged closer to the edge of the electrode assembly 13 in the third direction Z, reducing the situation of the electrode assembly 13 shaking under force, thereby improving the stability of the electrode assembly 13.

[0171] In some embodiments of the present application, such as Figure 7 and Figure 8 , or Figure 11 and Figure 12 as shown, along the third direction Z, the support protrusion 1421 is arranged flush with the edge of the second insulating member 142.

[0172] Specifically, along the third direction Z, setting the support protrusion 1421 to be flush with the edge of the second insulating member 142 can support the edge of the electrode assembly 13 in the third direction Z by the support protrusion 1421, further reducing the situation of the electrode assembly 13 shaking under force, and further improving the stability of the electrode assembly 13.

[0173] In some embodiments of the present application, such as Figure 7 and Figure 8 , or Figure 11 and Figure 12 as shown, support protrusions 1421 are respectively arranged on opposite sides of the middle position along the opposite direction of the third direction Z, and the two support protrusions 1421 are symmetrically arranged relative to the middle position.

[0174] Specifically, the two support protrusions 1421 are arranged at intervals along the third direction Z, and the electrode assembly 13 is supported by the two support protrusions 1421, thereby increasing the support positions of the electrode assembly 13 and further improving the stability of the electrode assembly 13.

[0175] In some embodiments of the present application, such as Figure 10 , or Figure 14 and Figure 15 as shown, the first insulating member 141 includes a first support surface 1414, the support protrusion 1421 includes a second support surface 1422, the first support surface 1414 and the second support surface 1422 are arranged flush, and both the first support surface 1414 and the second support surface 1422 face the electrode assembly 13 and are respectively abutted against the electrode assembly 13.

[0176] Specifically, the support protrusion 1421 and the first insulating member 141 respectively abut against the electrode assembly 13. The support protrusion 1421 and the first insulating member 141 form a support for the electrode assembly 13, and the support positions of the support protrusion 1421 and the first insulating member 141 for the electrode assembly 13 are different. Among them, the first support surface 1414 of the first insulating member 141 faces the electrode assembly 13 and abuts against the end face of the electrode assembly 13 facing the first side wall 113, and the second support surface 1422 of the support protrusion 1421 faces the electrode assembly 13 and abuts against the end face of the electrode assembly 13 facing the first side wall 113.

[0177] The first support surface 1414 and the second support surface 1422 being flush means that the first support surface 1414 and the second support surface 1422 are coplanar. The first support surface 1414 and the second support surface 1422 are set to be coplanar, and the electrode assembly 13 is supported by the first support surface 1414 and the second support surface 1422 respectively, thereby reducing the height difference between the first support surface 1414 and the second support surface 1422 in the first direction X, enabling both the first insulating member 141 and the second insulating member 142 to effectively support the electrode assembly 13, and further improving the stability of the electrode assembly 13.

[0178] In addition, the first support surface 1414 forms a support for the electrode assembly 13, which can increase the contact area with the electrode assembly 13, reduce the pressure on the electrode assembly 13 at the support position, thereby reducing the degree of extrusion on the electrode assembly 13, and further reducing the damage to the electrode assembly 13 caused by extrusion.

[0179] In some embodiments of the present application, such as Figure 7 and Figure 8 , or Figure 11 and Figure 12 shown, the first insulating member 141 is connected to the support protrusion 1421.

[0180] Specifically, the support protrusion 1421 protrudes toward the electrode assembly 13. Setting the first insulating member 141 to be connected to the support protrusion 1421 can make the first insulating member 141 closer to the electrode assembly 13, reduce the volume of the first insulating member 141 in the first direction X, and lower the manufacturing cost of the first insulating member 141.

[0181] In some embodiments of the present application, such as Figure 7 and Figure 8 , or Figure 11 and Figure 12As shown, the support protrusion 1421 is provided with a first stepped structure 1423. The top surface of the first stepped structure 1423 constitutes a second support surface 1422. Part of the first insulating member 141 is embedded in the position where the first stepped structure 1423 is located. The side surface of the first insulating member 141 facing away from the electrode assembly 13 abuts against the bottom surface of the first stepped structure 1423. At least part of the side surface of the first insulating member 141 facing the electrode assembly 13 constitutes a first support surface 1414.

[0182] Specifically, the support protrusion 1421 is arranged close to or flush with the end of the second insulating member 142 along the third direction Z. Among them, along the second direction Y, the support protrusion 1421 is flush with the opposite ends of the second insulating member 142. The first stepped structure 1423 is arranged on the side with the second insulating member 142.

[0183] The first stepped structure 1423 is formed on the side surface of the support protrusion 1421 facing the electrode assembly 13 and is formed by the depression of part of the side surface of the support protrusion 1421 facing the electrode assembly 13. Among them, the top surface of the first stepped structure 1423 is the side surface closest to the electrode assembly 13, and the bottom surface of the first stepped structure 1423 is the side surface farthest from the electrode assembly 13.

[0184] When the first insulating member 141 is connected to the second insulating member 142, part of the first insulating member 141 is embedded in the first stepped structure 1423 of the support protrusion 1421. The structure of the first stepped structure 1423 is supplemented by using part of the body of the first insulating member 141, so that the first support surface 1414 and the second support surface 1422 form a coplanar structure, so as to realize the simultaneous support of the first insulating member 141 and the second insulating member 142 for the electrode assembly 13.

[0185] It should be noted that the first insulating member 141 and the support protrusion 1421 may or may not have a connection relationship.

[0186] In some embodiments of the present application, such as Figure 7 or Figure 8 , or Figure 11 and Figure 12 as shown, the first insulating member 141 is snap-connected to the support protrusion 1421.

[0187] Specifically, a card hole 1427 is provided at the position of the first stepped structure 1423 of the support protrusion 1421, and a card protrusion 1411 is provided on the first insulating member 141. The card protrusion 1411 is snapped into the card hole 1427, thereby forming a snap structure, and further realizing the connection between the first insulating member 141 and the support protrusion 1421. The snap connection method has a simple structure and is convenient for assembly, and can effectively improve the assembly efficiency.

[0188] It should be noted that the number of the snap-fit ​​protrusions 1411 may be one or more, the number of the snap-fit ​​holes 1427 is consistent with the number of the snap-fit ​​protrusions 1411 , and each snap-fit ​​hole 1427 is correspondingly provided with a snap-fit ​​protrusion 1411 .

[0189] In addition, the card hole 1427 is arranged on the bottom surface of the first step structure 1423, and the card protrusion 1411 is arranged on the side of the first insulating member 141 facing the second insulating member 142, and the card protrusion 1411 of the first insulating member 141 is carded into the card hole 1427 by pressing the first insulating member 141 downward.

[0190] In addition, in other embodiments, the first insulating member 141 and the supporting protrusion 1421 may be connected by bonding or welding.

[0191] In some embodiments of the present application, at least one protruding structure 1412 is disposed on the side of the first insulating member 141 facing away from the electrode assembly 13 , and the at least one protruding structure 1412 is connected to or in contact with the second insulating member 142 .

[0192] Specifically, the first insulating member 141 is a long strip structure, which has poor strength in the length direction and is prone to collapse, that is, the first insulating member 141 is bent. The protruding structure 1412 is provided to form a support between the first insulating member 141 and the second insulating member 142, thereby improving the structural strength of the first insulating member 141 and reducing the bending and collapse of the first insulating member 141.

[0193] In some embodiments of the present application, Figure 6 As shown, the battery cell 10 also includes a pressure relief mechanism 15, the pressure relief mechanism 15 is provided on the first side wall 113, the second insulating member 142 is provided with an exhaust hole 1425, the exhaust hole 1425 is arranged opposite to the pressure relief mechanism 15, and the first insulating member 141 is provided with an avoidance hole 1413, the avoidance hole 1413 is arranged opposite to the exhaust hole 1425 and avoids the exhaust hole 1425.

[0194] Specifically, a pressure relief mechanism 15 is provided on the first side wall 113. The pressure relief mechanism 15 opens when the internal pressure of the outer shell 11 reaches a set threshold to release the pressure in the outer shell 11. The second insulating member 142 is blocked between the first side wall 113 and the electrode assembly 13. In order to enable the gas to be discharged normally through the pressure relief mechanism 15, an exhaust hole 1425 is provided on the second insulating member 142, so that the exhaust hole 1425 can be used to guide the gas to the pressure relief mechanism 15 during pressure relief, thereby realizing the smooth implementation of the pressure relief operation.

[0195] The first insulating member 141 passes through the position of the exhaust hole 1425 of the second insulating member 142, and the first insulating member 141 shields a part of the exhaust hole 1425. Therefore, an avoidance hole 1413 is formed in the first insulating member 141, and the avoidance hole 1413 is arranged corresponding to the exhaust hole 1425, so that the exhaust hole 1425 is not blocked, which can reduce the shielding of the first insulating member 141 on the pressure relief mechanism 15 to realize the normal opening of the pressure relief mechanism 15.

[0196] In some embodiments of the present application, such as Figure 7 and Figure 8 or Figure 11 and Figure 12 shown, the side of the second insulating member 142 facing the electrode assembly 13 further includes a boss structure 1424. An exhaust hole 1425 is formed in the boss structure 1424. A second step structure 1426 is provided on the side of the boss structure 1424 facing the electrode assembly 13. The top surface of the first step structure 1423 constitutes a part of the second support surface 1422. A part of the first insulating member 141 is embedded in the position where the second step structure 1426 is located. The side of the second insulating member 142 facing away from the electrode assembly 13 abuts against the bottom surface of the second step structure 1426.

[0197] Specifically, along the second direction Y, the boss structure 1424 is arranged at the middle position of the second insulating member 142. The pressure relief mechanism 15 is arranged on the first side wall 113 and is arranged opposite to the middle position. The boss structure 1424 is a protrusion formed on the side facing the electrode assembly 13. The side of the protrusion facing away from the electrode assembly 13 is a groove structure for accommodating the structure of the pressure relief mechanism 15 to realize the installation of the pressure relief mechanism 15. An exhaust hole 1425 is formed in the boss structure 1424. The side of the boss structure 1424 facing the electrode assembly 13 abuts against the first insulating member 141 and forms a support for the first insulating member 141. Using the boss structure 1424 to support the first insulating member 141 can improve the structural strength and stability of the first insulating member 141 to provide a better support effect for the electrode assembly 13 through the first insulating member 141.

[0198] In addition, along the third direction Z, the boss structure 1424 is arranged at the middle position of the second insulating member 142, and along the second direction Y, the support protrusion 1421 is flush with the opposite ends of the second insulating member 142. The second step structure 1426 is arranged on the side with the second insulating member 142.

[0199] The second step structure 1426 is formed on the side of the boss structure 1424 facing the electrode assembly 13, and is formed by recessing a part of the side of the boss structure 1424 facing the electrode assembly 13. Among them, the top surface of the second step structure 1426 is the side surface closest to the electrode assembly 13, and the bottom surface of the second step structure 1426 is the side surface farthest from the electrode assembly 13.

[0200] When the first insulating member 141 is connected to the second insulating member 142, a part of the first insulating member 141 is embedded in the second step structure 1426 of the boss structure 1424, and the structure of the second step structure 1426 is supplemented by using a part of the body of the first insulating member 141, so that the boss structure 1424 and the first insulating member 141 are coplanarly arranged, so as to realize that the first insulating member 141 and the boss structure 1424 support the electrode assembly 13 at the same time.

[0201] In some embodiments of the present application, such as Figure 7 and Figure 8 , or Figure 11 and Figure 12 As shown, along the third direction Z, the boss structure 1424 is located in the middle position, and support protrusions 1421 are respectively arranged at intervals on the opposite sides of the boss structure 1424 along the opposite direction of the third direction Z. A protrusion structure 1412 is provided between the support protrusion 1421 and the boss structure 1424.

[0202] Specifically, by providing the protrusion structure 1412, the structural strength of the first insulating member 141 is improved, and the situation of the first insulating member 141 collapsing is reduced.

[0203] In some embodiments of the present application, such as Figure 9 or Figure 13 As shown, the protrusion structure 1412 includes a connected cylindrical part 14121 and a rib plate part 14122. Along the direction from the support protrusion 1421 to the boss structure 1424, the rib plate part 14122 and the cylindrical part 14121 are arranged in sequence.

[0204] Specifically, on the basis of having sufficient support formation, the protrusion structure 1412 can reduce the material usage of the protrusion structure 1412, thereby reducing the manufacturing cost of the first insulating member 141.

[0205] In some embodiments of the present application, such as Figure 9 or Figure 13 As shown, the first insulating member 141 is an integral structure and extends along the third direction Z. The third direction Z, the second direction Y, and the first direction X intersect pairwise.

[0206] Specifically, the first insulating member 141 is configured as an integrated structure and is configured to extend along the third direction Z, so that the processing steps for the first insulating member 141 can be reduced, thereby improving the processing efficiency of the first insulating member 141 .

[0207] In some embodiments of the present application, the first insulating member 141 is a multi-section structure, which is sequentially arranged along the third direction Z and each section structure extends along the third direction Z, and the third direction Z, the second direction Y and the first direction X intersect each other.

[0208] Specifically, the first insulating member 141 is set as a multi-section structure, and the section structures are arranged in sequence along the third direction Z and each section structure is extended along the third direction Z, which can reduce the difficulty of processing the first insulating member 141 and improve the processing convenience of the first insulating member 141.

[0209] In some embodiments of the present application, the first insulating member 141 is an integrated structure and extends along the third direction Z. Along the third direction Z, the first insulating member 141 has a first length, and the second insulating member 142 has a second length. The first length is greater than or equal to one quarter of the second length and less than or equal to the second length.

[0210] Specifically, by setting the first insulating member 141, the first insulating member 141 can have a sufficient length in the third direction Z, so that the first insulating member 141 can provide sufficient supporting force for the electrode assembly 13, so that the force of the electrode assembly 13 is balanced, and the skewing of the electrode assembly 13 caused by unbalanced force is reduced.

[0211] It should be noted that the ratio of the first length to the second length may be 1 / 4, 1 / 3, 2 / 3, 3 / 4, etc.

[0212] In some embodiments of the present application, the first length is greater than or equal to half of the second length and less than or equal to the second length.

[0213] Specifically, by further setting the first insulating member 141, it is further ensured that the first insulating member 141 has a sufficient length in the third direction Z, so that the first insulating member 141 can provide sufficient supporting force for the electrode assembly 13, so that the force of the electrode assembly 13 is balanced, and the skewing of the electrode assembly 13 caused by unbalanced force is reduced.

[0214] It should be noted that the ratio of the first length to the second length may be 1 / 2, 4 / 5, 5 / 6, 6 / 7, 1, etc.

[0215] In some embodiments of the present application, Figures 11 to 15As shown, the first insulating member 141 is of an integral structure and extends along the third direction Z, and at least one reinforcing structure 1415 is provided on the first insulating member 141.

[0216] Specifically, by providing the reinforcing structure 1415 on the first insulating member 141, the structural strength of the first insulating member 141 can be enhanced by means of the reinforcing structure 1415, so that the first insulator can effectively support the electrode assembly 13, thereby maintaining the force balance of the electrode assembly 13 and reducing the occurrence of skew of the electrode assembly 13.

[0217] It should be noted that the reinforcing structure 1415 can be a rib plate or a concave structure provided on the first insulating member 141, etc.

[0218] In addition, the number of the reinforcing structures 1415 can be one, two, three, four, five, six, etc.

[0219] In some embodiments of the present application, the reinforcing structure 1415 is a concave structure formed on the side of the first insulating member 141 facing the electrode assembly 13.

[0220] Specifically, the reinforcing structure 1415 is set as a concave structure. With such a setting, the structure is simple, easy to process, and can effectively reduce the manufacturing cost.

[0221] In some embodiments of the present application, along the second direction Y, the first insulating member 141 has a first dimension, the tab 131 has a second dimension, and the electrode assembly 13 has a third dimension, wherein the sum of the first dimension and the second dimension is greater than zero and less than or equal to the third dimension.

[0222] Specifically, by setting the first dimension and the second dimension in the second direction Y, the tab 131 and the first insulating member 141 do not protrude from the electrode assembly 13 in both the second direction Y and the third direction Z, thereby reducing the interference with other structures of the battery cell 10.

[0223] It should be noted that the specific value of the ratio of the sum of the first dimension and the second dimension to the third dimension can be 1 / 10, 1 / 9, 1 / 8, 1 / 7, 1 / 6, 1 / 5, 1 / 4, 1 / 3.

[0224] In some embodiments of the present application, the sum of the first dimension and the second dimension is greater than or equal to one-half of the third dimension and less than or equal to the third dimension.

[0225] Specifically, by further setting the first dimension and the second dimension in the second direction Y, the tab 131 and the first insulating member 141 both have good support performance, and further can provide better support for the electrode assembly 13, so that the stability of the electrode assembly 13 is improved.

[0226] It should be noted that the specific value of the sum of the first dimension and the second dimension divided by the third dimension can be 1 / 2, 2 / 3, 3 / 4, 4 / 5, 5 / 6, 6 / 7, 7 / 8, 8 / 9, 1.

[0227] In some embodiments of the present application, along the second direction Y, the distance between the first insulating member 141 and the tab 131 is greater than or equal to zero and less than the third dimension minus 3 mm.

[0228] Specifically, by setting the distance between the first insulating member 141 and the tab 131 in the second direction Y, such a setting can enable the first insulating member 141 and the tab 131 to be reasonably arranged in the third direction Z, reducing the interference between them.

[0229] In some embodiments of the present application, the distance between the first insulating member 141 and the tab 131 is greater than or equal to one-fourth of the third dimension and less than one-half of the third dimension.

[0230] Specifically, by further setting the distance between the first insulating member 141 and the tab 131 in the second direction Y, such a setting can enable the first insulating member 141 and the tab 131 to have sufficient spacing in the third direction Z, further reducing the interference between the first insulating member 141 and the tab 131.

[0231] It should be noted that in the present application, along the second direction Y, the minimum value of the first dimension of the first insulating member 141 can be 3 mm, and the maximum value can be one-half of the size of the second insulating member 142.

[0232] In some embodiments of the present application, the housing 11 includes a housing body 112 and an end cap 111. The housing body 112 has an opening, the end cap 111 is connected to the housing body 112 and closes the opening. The end cap 111 and the housing body 112 enclose a receiving space, and the end cap 111 constitutes the first side wall 113.

[0233] Specifically, the housing 11 is provided as two parts, namely the housing body 112 and the end cap 111, thereby improving the convenience of processing and assembly and effectively enhancing the production efficiency.

[0234] It should be noted that the cooperation method between the end cap 111 and the housing body 112 includes but is not limited to snap connection, welding, or connection through a connecting member, etc.

[0235] In a second aspect of the present application, a battery device is proposed. The battery device includes at least one battery cell 10 assembly. The battery cell 10 assembly includes at least one battery cell 10, and the battery cell 10 is the battery cell 10 as described above.

[0236] In the battery cell 10, the first insulating member 141 and the tab 131 are arranged in the second direction Y. The first insulating member 141 abuts and limits the electrode assembly 13. The electrode assembly 13 is on the side with the tab 131. The first insulating member 141 and the tab 131 respectively support the electrode assembly 13, so that the electrode assembly 13 is in force balance at the end with the tab 131, reducing the skew situation of the electrode assembly 13 caused by unbalanced force due to unilateral force, thereby reducing the short-circuit problem caused by the skew of the electrode assembly 13, and effectively improving the safety performance of the battery cell 10.

[0237] The third aspect of the present application proposes an electrical device, which includes the battery device as described above.

[0238] In the battery cell 10 of the battery device, the first insulating member 141 and the tab 131 are arranged in the second direction Y. The first insulating member 141 abuts and limits the electrode assembly 13. The electrode assembly 13 is on the side with the tab 131. The first insulating member 141 and the tab 131 respectively support the electrode assembly 13, so that the electrode assembly 13 is in force balance at the end with the tab 131, reducing the skew situation of the electrode assembly 13 caused by unbalanced force due to unilateral force, thereby reducing the short-circuit problem caused by the skew of the electrode assembly 13, and effectively improving the safety performance of the battery cell 10.

[0239] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically given below.

[0240] In the embodiment of the present application, as Figures 3 to 15 shown, the present application proposes a battery cell 10, which includes a housing 11, an electrode terminal 12, an electrode assembly 13 and an insulating assembly 14. The housing 11 includes a plurality of side walls, and the plurality of side walls enclose an accommodation space. The plurality of side walls include a first side wall 113 and a second side wall 114. The first side wall 113 and the second side wall 114 are oppositely arranged along the first direction X. The electrode terminal 12 is provided on the first side wall 113. The electrode assembly 13 is arranged in the accommodation space. One end of the electrode assembly 13 facing the first side wall 113 includes a tab 131, and the tab 131 is electrically connected to the electrode terminal 12. The insulating assembly 14 is arranged in the accommodation space and is insulated between the first side wall 113 and the electrode assembly 13. The insulating assembly 14 includes a first insulating member 141. Along the second direction Y, the first insulating member 141 and the tab 131 are arranged, and the first insulating member 141 abuts against the electrode assembly 13. The first direction X intersects with the second direction Y.

[0241] The housing 11 includes a housing body 112 and an end cap 111. The housing body 112 has an opening, and the end cap 111 is connected to the housing body 112 and closes the opening. The end cap 111 and the housing body 112 enclose a receiving space, and the end cap 111 forms a first side wall 113.

[0242] The insulation assembly 14 further includes a second insulating member 142. The first insulating member 141 is connected to the second insulating member 142, and the second insulating member 142 is connected to the first side wall 113. Along the first direction X, the electrode assembly 13 has a projection on the second insulating member 142, and all the projections are within the range of the second insulating member 142. The first insulating member 141 is connected to the side of the second insulating member 142 facing the electrode assembly 13. The side of the second insulating member 142 facing the electrode assembly 13 includes support protrusions 1421. Along the third direction Z, the second insulating member 142 has a middle position, and support protrusions 1421 are provided on both sides of the middle position in the third direction Z. The two support protrusions 1421 are symmetrically arranged relative to the middle position. The support protrusions 1421 are in contact with the electrode assembly 13. The third direction Z, the second direction Y, and the first direction X intersect pairwise. Along the third direction Z, the distance between the support protrusion 1421 and the middle position is a first distance (minimum distance), and the distance between the support protrusion 1421 and the edge of the second insulating member 142 is a second distance (minimum distance). The first distance is greater than the second distance. Along the third direction Z, the support protrusion 1421 is flush with the edge of the second insulating member 142.

[0243] The first insulating member 141 includes a first support surface 1414, and the support protrusion 1421 includes a second support surface 1422. The first support surface 1414 and the second support surface 1422 are flush with each other. The first support surface 1414 and the second support surface 1422 both face the electrode assembly 13 and are respectively in contact with the electrode assembly 13. The first insulating member 141 is connected to the support protrusion 1421. The support protrusion 1421 is provided with a first step structure 1423. The top surface of the first step structure 1423 forms the second support surface 1422. Part of the first insulating member 141 is embedded in the position where the first step structure 1423 is located. The side surface of the first insulating member 141 facing away from the electrode assembly 13 abuts against the bottom surface of the first step structure 1423. At least part of the side surface of the first insulating member 141 facing the electrode assembly 13 forms the first support surface 1414. The first insulating member 141 is snap-connected to the support protrusion 1421.

[0244] Two protrusion structures 1412 are provided on the side surface of the first insulating member 141 facing away from the electrode assembly 13, and the protrusion structures 1412 are in fit with the second insulating member 142.

[0245] The battery cell 10 further includes a pressure relief mechanism 15. The pressure relief mechanism 15 is provided on the first side wall 113. An exhaust hole 1425 is provided on the second insulating member 142. The exhaust hole 1425 is disposed opposite to the pressure relief mechanism 15. An avoidance hole 1413 is provided on the first insulating member 141. The avoidance hole 1413 is disposed opposite to the exhaust hole 1425 and avoids the exhaust hole 1425.

[0246] On the side of the second insulating member 142 facing the electrode assembly 13, it further includes a boss structure 1424. An exhaust hole 1425 is formed in the boss structure 1424. A second step structure 1426 is provided on the side surface of the boss structure 1424 facing the electrode assembly 13. The top surface of the first step structure 1423 constitutes a part of the second support surface 1422. A part of the first insulating member 141 is embedded in the position where the second step structure 1426 is located. The side surface of the second insulating member 142 facing away from the electrode assembly 13 abuts against the bottom surface of the second step structure 1426. Along the third direction Z, the boss structure 1424 is located at the middle position. Support protrusions 1421 are respectively provided at intervals on the opposite sides of the boss structure 1424 along the opposite direction of the third direction Z. A protruding structure 1412 is provided between the support protrusion 1421 and the boss structure 1424. The protruding structure 1412 includes a connected cylindrical portion 14121 and a rib portion 14122. Along the direction from the support protrusion 1421 to the boss structure 1424, the rib portion 14122 and the cylindrical portion 14121 are arranged in sequence.

[0247] Along the third direction Z, the first insulating member 141 has a first length (maximum dimension), and the second insulating member 142 has a second length (maximum dimension). The first length is greater than or equal to one-half of the second length and less than or equal to the second length. The first insulating member 141 is an integral structure and extends along the third direction Z. A plurality of strengthening structures 1415 are provided on the first insulating member 141. The strengthening structures 1415 are recessed structures formed on the side of the first insulating member 141 facing the electrode assembly 13. Along the second direction Y, the first insulating member 141 has a first dimension (maximum dimension), the tab 131 has a second dimension (maximum dimension), and the electrode assembly 13 has a third dimension (maximum dimension). The sum of the first dimension and the second dimension is greater than or equal to one-half of the third dimension and less than or equal to the third dimension.

[0248] Along the second direction Y, the distance between the first insulating member 141 and the tab 131 is greater than or equal to one-fourth of the third dimension and less than one-half of the third dimension.

[0249] Along the second direction Y, the first dimension of the first insulating member 141 can be at least 3 mm at the minimum and at most one-half of the dimension of the second insulating member 142 at the maximum.

[0250] In the present application, the first insulating member 141 and the tab 131 are arranged in the second direction Y. The first insulating member 141 abuts and limits the electrode assembly 13. On the side of the electrode assembly 13 with the tab 131, the first insulating member 141 and the tab 131 respectively support the electrode assembly 13, so that the electrode assembly 13 is in force balance at the end with the tab 131, reducing the skew situation caused by the unbalanced force on one side of the electrode assembly 13, thereby reducing the short-circuit problem caused by the skew of the electrode assembly 13, and further effectively improving the safety performance of the battery cell 10. 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 them; 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 described 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 by the scope of the claims and the specification 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: The battery cell comprises: A housing, the housing comprising a plurality of side walls, the plurality of side walls enclosing a receiving space, the plurality of side walls comprising a first side wall and a second side wall, the first side wall and the second side wall being arranged opposite to each other along a first direction; An electrode terminal, wherein the first side wall is provided with the electrode terminal; an electrode assembly, the electrode assembly being disposed in the accommodation space, wherein one end of the electrode assembly facing the first side wall comprises a pole ear, and the pole ear is electrically connected to the electrode terminal; An insulating component is arranged in the accommodating space and insulated between the first side wall and the electrode assembly, the insulating component includes a first insulating member, the first insulating member and the pole ear are arranged along the second direction, the first insulating member abuts against the electrode assembly, along the second direction, the first insulating member has a first size, the pole ear has a second size, and the electrode assembly has a third size, wherein the sum of the first size and the second size is greater than zero and less than or equal to the third size, and the first direction intersects with the second direction.

2. The battery cell according to claim 1, characterized in that: The insulating assembly further includes a second insulating member, the first insulating member is connected to the second insulating member, and at least one of the first insulating member and the second insulating member is connected to the first side wall.

3. The battery cell according to claim 2, characterized in that: Along the first direction, the electrode assembly has a projection on the second insulating member, all of the projections are within the range of the second insulating member, and the first insulating member is connected to a side of the second insulating member facing the electrode assembly.

4. The battery cell according to claim 3, characterized in that: The side of the second insulating member facing the electrode assembly includes a supporting protrusion. Along the third direction, the second insulating member has an intermediate position, and the intermediate position is provided with the supporting protrusion on at least one side of the third direction. The supporting protrusion abuts against the electrode assembly, and the third direction, the second direction and the first direction intersect each other.

5. The battery cell according to claim 4, characterized in that: Along the third direction, the distance between the support protrusion and the middle position is a first distance, the distance between the support protrusion and the edge of the second insulating member is a second distance, and the first distance is greater than the second distance.

6. The battery cell according to claim 5, characterized in that: Along the third direction, the supporting protrusion is arranged flush with the edge of the second insulating member; And / or, the supporting protrusions are respectively arranged on opposite sides of the middle position along the third direction, and the two supporting protrusions are symmetrically arranged relative to the middle position.

7. The battery cell according to claim 4, characterized in that: The first insulating member includes a first supporting surface, the supporting protrusion includes a second supporting surface, the first supporting surface and the second supporting surface are arranged flush with each other, and the first supporting surface and the second supporting surface both face the electrode assembly and abut against the electrode assembly respectively.

8. The battery cell according to claim 7, characterized in that: The first insulating member is connected to the supporting protrusion.

9. The battery cell according to claim 8, characterized in that: The supporting protrusion is provided with a first step structure, the top surface of the first step structure constitutes at least a portion of the second supporting surface, a portion of the first insulating member is embedded in the position where the first step structure is located, the side of the first insulating member facing away from the electrode assembly rests on the bottom surface of the first step structure, and at least a portion of the side of the first insulating member facing the electrode assembly constitutes the first supporting surface.

10. The battery cell according to claim 8, characterized in that: The first insulating member is snap-connected to the supporting protrusion.

11. The battery cell according to claim 4, characterized in that: At least one protruding structure is provided on the side of the first insulating member facing away from the electrode assembly, and the at least one protruding structure is connected to or in contact with the second insulating member.

12. The battery cell according to claim 11, characterized in that: The battery cell also includes a pressure relief mechanism, which is disposed on the first side wall, an exhaust hole is disposed on the second insulating member, the exhaust hole is arranged opposite to the pressure relief mechanism, and an avoidance hole is disposed on the first insulating member, the avoidance hole is arranged opposite to the exhaust hole and avoids the exhaust hole.

13. The battery cell according to claim 12, characterized in that: The side of the second insulating member facing the electrode assembly also includes a boss structure, the exhaust hole is opened on the boss structure, and a second step structure is provided on the side of the boss structure facing the electrode assembly. The top surface of the second step structure constitutes part of the second supporting surface, and part of the first insulating member is embedded in the position where the second step structure is located, and the side of the second insulating member facing away from the electrode assembly rests on the bottom surface of the second step structure.

14. The battery cell according to claim 13, characterized in that: Along the third direction, the boss structure is located at the middle position, the supporting protrusions are arranged at intervals on opposite sides of the boss structure along the third direction, and the protrusion structure is arranged between the supporting protrusion and the boss structure.

15. The battery cell according to claim 14, characterized in that: The protrusion structure includes a connected cylindrical portion and a rib plate portion, and the rib plate portion and the cylindrical portion are arranged in sequence along the direction from the supporting protrusion to the boss structure.

16. The battery cell according to claim 4, characterized in that: The first insulating member is an integrated structure and is extended along a third direction, and the third direction, the second direction and the first direction intersect each other; Alternatively, the first insulating member is a multi-section structure, the multi-section structure is sequentially arranged along the third direction and each section structure is extended along the third direction, and the third direction, the second direction and the first direction intersect each other.

17. The battery cell according to claim 16, characterized in that: The first insulating member is an integrated structure and extends along a third direction. Along the third direction, the first insulating member has a first length, the second insulating member has a second length, and the first length is greater than or equal to one quarter of the second length and less than or equal to the second length.

18. The battery cell according to claim 17, characterized in that: The first length is greater than or equal to half of the second length and less than or equal to the second length.

19. The battery cell according to claim 16, characterized in that: The first insulating member is an integrated structure and is extended along the third direction. At least one reinforcement structure is disposed on the first insulating member.

20. The battery cell according to claim 19, characterized in that The reinforcement structure is a recessed structure formed on a side of the first insulating member facing the electrode assembly. 21 . The battery cell according to claim 1 , wherein the sum of the first size and the second size is greater than or equal to one half of the third size and less than or equal to the third size.

22. The battery cell according to any one of claims 1 to 20, characterized in that: Along the second direction, the distance between the first insulating member and the pole lug is greater than or equal to zero and less than the third dimension minus 3 mm.

23. The battery cell according to claim 22, characterized in that: A distance between the first insulating member and the pole lug is greater than or equal to one quarter of the third dimension and less than one half of the third dimension.

24. The battery cell according to any one of claims 1 to 20, characterized in that: The housing comprises: a housing having an opening; An end cover is connected to the shell and closes the opening. The end cover and the shell enclose the accommodating space, and the end cover constitutes the first side wall.

25. A battery device, characterized in that: The battery device includes at least one battery cell assembly, and the battery cell assembly includes at least one battery cell. The battery cell is the battery cell according to any one of claims 1 to 24.

26. An electrical equipment, characterized in that: The electric device comprises the battery device according to claim 25.

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