Battery cell, battery device, and electric device

Abstract

A battery cell, a battery device, and an electrical appliance are disclosed. The battery cell includes a housing, an electrode assembly, and a terminal assembly. The housing has a receiving chamber and includes a first wall. The electrode assembly includes an electrode body and a tab connected to the electrode body. The terminal assembly includes a connecting structure, a terminal body, and an inner insulating member. The connecting structure is disposed on the first wall, the terminal body is disposed on the connecting structure and connected to the tab, and the inner insulating member is located within the receiving chamber and disposed on the side of the connecting structure facing the electrode body. The inner insulating member has a heat-resistant portion on the side facing the electrode body, which is located adjacent to the terminal body. Thus, the inner insulating member can reduce the risk of short circuits formed between the tab, the terminal body, and the connecting structure. During the welding process between the tab and the terminal body, the heat-resistant portion contacts the tab, reducing the risk of the inner insulating member being burned or damaged by the tab during welding, thereby improving the insulation performance of the inner insulating member.

Description

Technical Field

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

[0002] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0003] In related technologies, a battery cell includes a housing and a terminal assembly. The terminal assembly is detachably mounted on the housing. During the welding process between the terminal body and the tab, if the tab comes into contact with the insulating component of the terminal assembly, the insulating component may be burned, affecting its insulation performance. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical appliance that can reduce the risk of insulation components being burned or damaged by the tabs during the welding process.

[0005] The battery cell of this application includes a housing, an electrode assembly, and a terminal assembly. The housing has a receiving chamber and includes a first wall. The electrode assembly includes an electrode body and a tab connected to the electrode body. The terminal assembly includes a connecting structure, a terminal body, and an inner insulating member. The connecting structure is disposed on the first wall, the terminal body is disposed on the connecting structure and connected to the tab, and the inner insulating member is located in the receiving chamber and disposed on the side of the connecting structure facing the electrode body. The side of the inner insulating member facing the electrode body has an anti-scalding portion, which is disposed on the side of the inner insulating member adjacent to the terminal body.

[0006] In the battery cell of this application embodiment, the adapter structure can carry the electrode body and the inner insulation component. The inner insulation component can reduce the risk of short circuit between the electrode tab, the electrode body and the adapter structure respectively. During the welding process between the electrode tab and the electrode body, the anti-scalding part contacts the electrode tab, which can reduce the risk of the inner insulation component being burned or damaged by the electrode tab during the welding process and improve the insulation performance of the inner insulation component.

[0007] In some embodiments, the anti-scalding portion is formed by locally thickening the inner insulating member. In the above embodiments, the anti-scalding portion is formed by locally thickening the inner insulating member, which increases the local material of the inner insulating member and improves the anti-scalding performance.

[0008] In some embodiments, the adapter structure includes a first adapter and a second adapter connected to the first adapter. The first adapter is disposed on the first wall, has a first through hole, and includes an adapter bottom surface connected to the hole wall of the first through hole. The adapter bottom surface faces the electrode body. The first through hole penetrates the first adapter in a first direction. The inner insulating member is disposed on the adapter bottom surface, and the anti-scalding part is disposed near the edge of the first through hole.

[0009] In the above embodiments, the adapter structure includes a first adapter and a second adapter for assembly connection, thereby facilitating the assembly connection of the adapter structure with the external insulation component and the pole body, making the pole assembly easy to process and manufacture.

[0010] In some embodiments, the first adapter has a first recessed groove formed from the bottom surface of the adapter, the first recessed groove is connected to the first through hole, the inner insulating member is at least partially embedded in the first recessed groove, the locally thickened part of the inner insulating member corresponds to the first recessed groove, and the pole body passes through the first through hole.

[0011] In the above embodiment, the first sink makes it easy for the inner insulation to form a local thickening effect, and after the inner insulation is locally thickened, it occupies less internal space of the casing, thus reducing the impact on the energy density reduction of the battery cell.

[0012] In some embodiments, the inner insulating member is provided with a second through hole and a second recessed groove. The second through hole penetrates the inner insulating member along a first direction. The second recessed groove is located on the side of the inner insulating member facing the electrode body and communicates with the second through hole. A protrusion is provided in the second recessed groove. The protrusion corresponds to a locally thickened portion of the inner insulating member. The anti-scalding part includes the protrusion. The electrode body passes through the second through hole.

[0013] In the above embodiment, the protrusion of the anti-scalding part is disposed in the second sink groove. In this way, during the welding process between the electrode tab and the electrode post body, the protrusion can exchange heat with the air through the second sink groove, thereby reducing the temperature rise of the protrusion.

[0014] In some embodiments, the second through hole includes a straight edge and a curved edge connected to the straight edge, and the number of the protrusions is multiple, with the multiple protrusions spaced apart along the extension direction of the straight edge.

[0015] In the above embodiments, during the welding process between the electrode tab and the electrode post body, multiple protrusions are generally arranged at intervals along the extension direction of the straight edge corresponding to the straight edge of the second through hole. This can reduce the risk of the electrode tab burning the inner insulation component.

[0016] In some embodiments, there are two straight edges and two curved edges, with the two straight edges arranged opposite each other, each curved edge connecting the two straight edges, and each straight edge having a plurality of protrusions on one side.

[0017] In the above embodiments, each straight edge is provided with a plurality of protrusions on one side, and the electrode tab can correspond to any straight edge during the welding process, thereby improving the assembly adaptability of the inner insulation component.

[0018] In some embodiments, the anti-scalding portion includes a heat-resistant member disposed on the inner insulation member. In the above embodiments, the heat-resistant member has good heat resistance, which enables the anti-scalding portion on the inner insulation member to have anti-scalding properties.

[0019] In some embodiments, the inner insulating member is provided with a second through hole, the second through hole penetrating the inner insulating member along the thickness direction, the heat-resistant member is located at the edge of the second through hole, and the pole body is inserted into the second through hole.

[0020] In the above embodiment, when the electrode tab is welded to the electrode post body, the electrode tab can easily cover the edge of the second through hole, and the heat-resistant component is located at the edge of the second through hole. This allows the electrode tab to come into contact with the heat-resistant component during the welding process, reducing the degree of burns to the inner insulation component.

[0021] In some embodiments, the second through hole includes a straight edge and a curved edge connected to the straight edge, and the number of heat-resistant elements is multiple, with the multiple heat-resistant elements spaced apart along the extension direction of the straight edge.

[0022] In the above embodiments, during the welding process between the electrode tab and the electrode post body, multiple heat-resistant components are generally arranged at intervals along the extension direction of the straight edge corresponding to the straight edge, which can reduce the risk of burns to the inner insulation component from the electrode tab.

[0023] In some embodiments, there are two straight edges and two curved edges, with the two straight edges arranged opposite each other, each curved edge connecting the two straight edges, and a plurality of heat-resistant components provided on one side of each straight edge.

[0024] In the above embodiments, each of the straight edges is provided with a plurality of heat-resistant components on one side, and the electrode tab can correspond to any straight edge during the welding process, thereby improving the assembly adaptability of the inner insulation component.

[0025] In some embodiments, the pole assembly includes an outer insulating member, the adapter structure is disposed on the first wall, the pole body is disposed on the adapter structure, the outer insulating member is disposed on the adapter structure and isolates the adapter structure and the pole body, the adapter structure includes an exposed top surface facing away from the receiving chamber, the outer insulating member includes a circumferential surface surrounding the pole body and connected to the top surface, the circumferential surface extending at least partially from the top surface along a first direction, the total height of the circumferential surface along the first direction being H1, the total height of the outer insulating member from the top surface along the first direction being H2, and 0.85 ≤ H1 / H2 ≤ 1.

[0026] In the battery cell of this application embodiment, the ratio of the total height of the circumferential surface of the outer insulation component to the total height of the outer insulation component is H1 / H2. When 0.85≤H1 / H2≤1, the total height of the circumferential surface of the outer insulation component accounts for a larger proportion, thereby making it easier and more stable to clamp the circumferential surface of the outer insulation component to clamp and install the terminal assembly onto the housing, thus improving the assembly efficiency of the battery cell.

[0027] In some embodiments, H1 satisfies the condition that H1 ≥ 1.5 mm. In the above embodiments, when H1 is within the above range, the circumferential surface of the outer insulation has sufficient height for clamping, which facilitates clamping and installing the pole assembly onto the housing.

[0028] In some embodiments, the outer insulating member has a groove recessed from the circumferential surface. In the above embodiments, the groove can reduce the amount of material used in the outer insulating member and reduce the manufacturing cost of the outer insulating member.

[0029] In some embodiments, the circumferential surface includes a circumferential edge away from the top surface of the adapter, and the groove is closer to the circumferential edge relative to the top surface of the adapter. In the above embodiments, the groove being closer to the circumferential edge relative to the top surface of the adapter results in a larger continuous surface area of ​​the circumferential surface of the outer insulation member along the first direction, which is beneficial for clamping the pole assembly.

[0030] In some embodiments, the outer insulating component includes an insulating end face opposite to the top surface of the transition, where H2 is the distance between the insulating end face and the top surface of the transition, and the insulating end face transitions to the circumferential surface with an arc. In the above embodiments, the arc transition between the insulating end face and the circumferential surface makes the outer insulating component easier to manufacture and shapes, thus reducing the manufacturing cost of the outer insulating component.

[0031] In some embodiments, the electrode body protrudes from the insulating end face. In the above embodiments, the electrode body is easily connected to external electrical components.

[0032] In some embodiments, the adapter structure includes a first adapter and a second adapter connected to the first adapter. The first adapter is disposed on the first wall, and the second adapter presses against the pole body through the outer insulating member. The second adapter includes the top surface of the adapter, and the outer insulating member covers at least a portion of the second adapter and isolates the outer insulating member from the pole body.

[0033] In the above embodiments, the adapter structure includes a first adapter and a second adapter for assembly connection, thereby facilitating the assembly connection of the adapter structure with the external insulation component and the pole body, making the pole assembly easy to process and manufacture.

[0034] In some embodiments, the pole assembly includes a seal disposed between the first adapter and the pole body, the seal sealing the gap between the first adapter and the pole body.

[0035] In the above embodiment, the sealing element seals the gap between the first adapter and the pole body, which can improve the sealing effect between the pole body and the first adapter, improve the leakage problem at the mating position of the first adapter and the pole body, and achieve the effect of insulating the first adapter and the pole body.

[0036] In some embodiments, the battery cell includes an insulating support disposed on the inner side of the first wall, the insulating support covering the inner insulating element and the adapter structure, the insulating support having a through hole through which the electrode tab passes.

[0037] In the above embodiments, since the insulating bracket covers the inner insulating component and the transition structure, the insulating bracket can insulate and separate the electrode body from the transition structure, reducing the risk of short circuit between the transition structure and the electrode body and improving the reliability of the battery cell.

[0038] In some embodiments, the insulating support includes a connecting portion and a covering portion connected to the connecting portion, the covering portion covering the inner insulating member and the transition structure, the connecting portion being bent relative to the covering portion, and one end of the connecting portion away from the covering portion being connected to the first wall.

[0039] In the above embodiments, the connecting portion facilitates the mounting of the insulating bracket on the first wall, and the covering portion can cover the inner insulating component and the transition structure.

[0040] In some embodiments, a blocking strip is provided between the inner insulating member and the covering portion, the blocking strip extending at least partially in a third direction.

[0041] In the above embodiments, the blocking strip can reduce the risk of the electrode tab being inserted through the gap between the inner insulator and the insulating support, and thus coming into contact with the first adapter or the first wall, forming a short circuit.

[0042] In some embodiments, the barrier strip is fixed to the inner insulation member. In the above embodiments, the barrier strip is easy to manufacture.

[0043] In some embodiments, the covering portion includes a first covering segment, a second covering segment, and a third covering segment connected in sequence. The first covering segment is connected to the connecting portion. The second covering segment is bent relative to the first covering segment. The third covering segment is provided with the through hole. The blocking strip is opposite to the second covering segment in a first direction.

[0044] In the above embodiment, the gap between the second covering section and the inner insulating member is relatively large, and the probability of the electrode tab extending from the gap between the second covering section and the inner insulating member to the first adapter is relatively high. The blocking strip is opposite to the second covering section in the first direction, which can effectively block the extension path of the electrode tab and reduce the risk of short circuit caused by contact between the electrode tab and the first adapter or the first wall.

[0045] In some embodiments, the projections of the blocking strip and the first covering segment along the second direction have an overlapping portion, and the first direction, the second direction, and the third direction intersect each other.

[0046] In the above embodiment, the blocking strip can prevent the electrode tab from extending directly towards the first shielding part in the second direction and then contacting the first adapter and the first wall.

[0047] In some embodiments, the minimum distance between the blocking strip and the second covering segment is D, where D ≤ 0.052 mm.

[0048] In the above embodiment, the distance between the blocking strip and the second covering section is small, which can effectively block the tab.

[0049] In some embodiments, the height of the barrier strip protruding from the inner insulation member is H3, where H3 ≥ 0.6 mm.

[0050] In the above embodiments, when the height of the blocking strip is within the above range, it is beneficial to manufacture and shape the blocking strip.

[0051] In some embodiments, the blocking strip is fixed to the insulating support.

[0052] In the above embodiments, the position of the blocking strip is stable, which can improve the effect of the blocking strip in preventing the contact between the electrode tab and the adapter structure.

[0053] In some embodiments, the inner insulating member is provided with an embedding groove, and the blocking strip is at least partially embedded in the embedding groove.

[0054] In the above embodiment, the blocking strip is at least partially embedded in the embedding groove, which can block the path of the electrode tab extending from the gap between the inner insulating member and the insulating support to the adapter structure, reducing the risk of short circuit due to contact between the electrode tab and the adapter structure.

[0055] This application also provides a battery device comprising a plurality of battery cells as described in any of the above embodiments.

[0056] This application also provides an electrical device, which includes the battery device or battery cell described in any of the above embodiments.

[0057] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0058] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0059] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0060] Figure 2 This is an exploded perspective view of a battery device according to some embodiments of this application;

[0061] Figure 3 This is a perspective view of a battery cell according to some embodiments of this application;

[0062] Figure 4 This is a top view schematic diagram of a battery cell according to some embodiments of this application;

[0063] Figure 5 for Figure 4 A schematic cross-sectional view of a single battery cell along the AA direction;

[0064] Figure 6 This is a schematic cross-sectional view of a battery cell according to some embodiments of this application;

[0065] Figure 7 This is a perspective view of the internal insulation element in some embodiments of this application;

[0066] Figure 8 This is another perspective view of the internal insulation element in some embodiments of this application;

[0067] Figure 9 This is a schematic diagram illustrating the manufacturing process of a single battery cell according to some embodiments of this application;

[0068] Figure 10 yes Figure 5 An enlarged schematic diagram of section I of the battery cell;

[0069] Figure 11 yes Figure 6 An enlarged schematic diagram of the battery cell II section.

[0070] Explanation of reference numerals in the attached figures:

[0071] 400 - Battery assembly; 410 - Housing; 411 - First housing; 412 - Second housing; 100 - Single battery cell; 10 - Casing; 11 - Receiving chamber; 12 - First wall; 20 - Electrode assembly; 21 - Electrode body; 22 - Tab;

[0072] 30 - Pole post assembly; 31 - Pole post body; 33 - Outer insulation component; 331 - Circumferential surface; 3311 - Circumferential edge; 332 - Groove; 333 - Insulating end face; 34 - Adapter structure; 3401 - Adapter top surface; 341 - First adapter component; 3411 - First through hole; 3412 - Adapter bottom surface; 3413 - First recess; 342 - Second adapter component; 35 - Seal; 36 - Inner insulation component; 361 - Second through hole Hole; 3611-Straight edge; 3612-Curved edge; 362-Second recess; 363-Embedding groove; 37-Anti-scalding part; 371-Protrusion; 372-Heat-resistant part; 40-Insulating bracket; 41-Through hole; 42-Connecting part; 43-Covering part; 431-First covering section; 432-Second covering section; 433-Third covering section; 50-Blocking strip; 1000-Vehicle; 200-Controller; 300-Motor. Detailed Implementation

[0073] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0074] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0075] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0076] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0077] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0078] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0079] In this application, "multiple" means two or more (including two).

[0080] In the embodiments of this application, unless otherwise specified, all implementation methods and optional implementation methods of this application can be combined with each other to form new technical solutions.

[0081] In the embodiments of this application, unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form new technical solutions.

[0082] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0083] In related technologies, a battery cell includes a housing and a terminal assembly. The terminal assembly is detachably mounted on the housing. During the welding process between the terminal body and the tab, most of the tab is in a flattened state. If the tab comes into contact with the insulation of the terminal assembly, the insulation may be burned, affecting the insulation performance of the insulation.

[0084] Therefore, this application provides a battery cell, which includes a housing, an electrode assembly, and a terminal assembly. The housing has a receiving chamber and includes a first wall. The electrode assembly includes an electrode body and a tab connected to the electrode body. The terminal assembly includes a connecting structure, a terminal body, and an inner insulating member. The connecting structure is disposed on the first wall, the terminal body is disposed on the connecting structure and connected to the tab, and the inner insulating member is located in the receiving chamber and disposed on the side of the connecting structure facing the electrode body. The side of the inner insulating member facing the electrode body has an anti-scalding portion, which is disposed on the side of the inner insulating member adjacent to the terminal body.

[0085] In the battery cell of this application embodiment, the adapter structure can carry the electrode body and the inner insulation component. The inner insulation component can reduce the risk of short circuit between the electrode tab, the electrode body and the adapter structure respectively. During the welding process between the electrode tab and the electrode body, the anti-scalding part contacts the electrode tab, which can reduce the risk of the inner insulation component being burned or damaged by the electrode tab during the welding process and improve the insulation performance of the inner insulation component.

[0086] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0087] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0088] Please refer to Figure 1 Vehicle 1000 can be a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. Furthermore, vehicle 1000 can be a commercial vehicle. A battery device 400 is installed inside vehicle 1000, which can be located at the bottom, front, or rear of vehicle 1000. Battery device 400 can be used to power vehicle 1000; for example, battery device 400 can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 200 and a motor 300. Controller 200 is used to control the battery device 400 to supply power to motor 300, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

[0089] In some embodiments of this application, the battery device 400 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0090] Please see Figure 2 In embodiments of this application, the battery apparatus 400 may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 100, which are connected in series, parallel, or mixed connections via busbars. For example, a battery cell assembly is typically formed by arranging multiple battery cells 100; a battery cell assembly may also be a battery module, which is formed by arranging and fixing multiple battery cells 100 into a single module. As an example, a battery module may be formed by bundling multiple battery cells 100 together with cable ties.

[0091] The battery device 400 can be a battery pack, which includes a housing 410 and one or more cell assemblies housed within the housing 410. The cell assembly can be a battery module, which can be housed within the housing 410 by fixing the battery module to the housing 410; alternatively, the cell assembly can be housed within the housing 410 by directly fixing multiple individual battery cells 100 to the housing 410.

[0092] In embodiments of this application, the housing 410 may include a first housing 411 and a second housing 412. The first housing 411 and the second housing 412 are fastened together, forming a closed space inside the housing 410 to house the battery cell assembly. Here, "closed" refers to covering or shutting off; it can be sealed or unsealed. The first housing 411 may be a top cover or a bottom plate. For example, the housing 410 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, forming a closed space inside the housing 410 to house the battery cell assembly.

[0093] In embodiments of this application, the housing 410 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 410 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 410 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0094] In this embodiment, the battery cell 100 can be a secondary battery, which refers to a battery cell 100 that can be recharged after discharge to activate the active materials and continue to be used. The battery cell 100 can be flat, cuboid, or other shapes, and this embodiment is not limited in this respect.

[0095] Please see Figures 3-6 The battery cell 100 of this application includes a housing 10, an electrode assembly 20, and a terminal assembly 30. The housing 10 has a receiving chamber 11 and includes a first wall 12. The electrode assembly 20 includes an electrode body 21 and a tab 22 connected to the electrode body 21. The terminal assembly 30 includes a terminal body 31, a connecting structure 34, and an inner insulating member 36. The connecting structure 34 is disposed on the first wall 12. The terminal body 31 is disposed on the connecting structure 34 and connected to the tab 22. The inner insulating member 36 is located in the receiving chamber 11 and is disposed on the side of the connecting structure 34 facing the electrode body 21. The side of the inner insulating member facing the electrode body 21 is provided with an anti-scalding part 37, which is disposed on the side of the inner insulating member adjacent to the terminal body 31.

[0096] Specifically, the housing 10 is a hollow structure, with an internal cavity 11 for accommodating the electrode assembly 20 and the electrolyte. The housing 10 can have various shapes, such as a cylinder or a cuboid. The shape of the housing 10 is determined based on the specific shape of the electrode assembly 20. For example, if the electrode assembly 20 is cylindrical, a cylindrical housing 10 can be used; if the electrode assembly 20 is cuboid, a cuboid housing 10 can be used. The housing 10 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, or plastic.

[0097] The first wall 12 can be an end wall along the height of the battery cell 100. The first wall 12 can be an integral part of the main body of the casing 10, or it can be a separate structure. For example... Figure 5 In one embodiment, the first wall 12 and the main body of the shell 10 are separate structures.

[0098] The electrode assembly 20 is the core component for enabling the charging and discharging function of the battery cell 100. The electrode body 21 includes a positive electrode, a negative electrode, and a separator. The positive and negative electrodes have opposite polarities, and the separator is used to insulate and isolate the positive and negative electrodes. The electrode assembly 20 mainly relies on the movement of metal ions between the positive and negative electrodes to operate.

[0099] In some embodiments, the positive electrode includes a positive current collector and a positive electrode film layer disposed on at least one surface of the positive current collector, the positive electrode film layer including a positive electrode active material. The positive current collector may be a metal foil or a composite current collector. For example, aluminum foil may be used as the metal foil. The composite current collector may include a polymer material substrate and a metal layer formed on at least one surface of the polymer material substrate. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).

[0100] In some embodiments, the negative electrode typically includes a negative current collector, or includes a negative current collector and a negative electrode film layer disposed on at least one surface of the negative current collector, the negative electrode film layer comprising a negative electrode active material. As an example, the negative current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode film layer may be disposed on either or both of the two opposite surfaces of the negative current collector.

[0101] Optionally, the negative electrode current collector can be a metal foil or a composite current collector. For example, copper foil can be used as the metal foil. The composite current collector may include a polymer material substrate and a metal layer formed on at least one surface of the polymer material substrate. The composite current collector can be formed by forming a metal material (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 (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).

[0102] The tab 22 is a sheet-like part with conductive function, which allows the tab 22 and the electrode body 31 to form a molten pool through laser or other means, thereby welding the tab 22 and the electrode body 31 together.

[0103] The terminal block 31 serves as a conductive terminal, allowing the electrical energy of the battery cell 100 to be discharged. The number of terminal blocks 31 can be two, four, or other quantities. Multiple terminal blocks 31 can be arranged along different paths according to different needs. The outer contour shape of the terminal block 31 includes, but is not limited to, circular, racetrack-shaped, elliptical, and rectangular shapes. The terminal block 31 can be a composite terminal block made of multiple materials.

[0104] The adapter structure 34 surrounds the entire circumference of the pole body 31, thereby enabling the adapter structure 34 to connect the pole body 31 and the first wall 12 in the outer peripheral area of ​​the pole body 31. The connection method between the adapter structure 34 and the first wall 12 is not limited; for example, it can be welded, riveted, drilled, or bonded.

[0105] The inner insulating member 36 can be made of insulating materials such as plastic. The inner insulating member 36 can be annular and surround the pole body 31. The inner insulating member 36 can be at least partially located on the surface of the adapter structure 34 to insulate the tab 22 and the adapter structure 34. In addition, since the inner insulating member 36 covers most of the adapter structure 34, the pole body 31 can be isolated from the adapter structure 34.

[0106] like Figures 7-9 As shown, during the welding process between the tab 22 and the electrode body 31, the tab 22 may overlap with the inner insulation component 36. The high heat generated during the welding process of the tab 22 is transferred to the inner insulation component 36 through the tab 22, which may cause the inner insulation component 36 to be burned and melted, affecting the insulation effect of the inner insulation component 36.

[0107] The anti-scalding part 37 is positioned adjacent to the electrode body 31, allowing it to come into contact with the electrode 22 during welding. Heat from the electrode 22 is first transferred to the anti-scalding part 37. Because the anti-scalding part 37 enhances the anti-scalding effect of the inner insulation component 36, the risk of burns to the inner insulation component 36 is reduced. Since the heat transferred by the electrode 22 dissipates during the transfer process, the risk of burns to parts of the inner insulation component 36 farther from the electrode body 31 is also lower.

[0108] Therefore, in the battery cell 100 of this application embodiment, the adapter structure 34 can carry the terminal body 31 and the inner insulation component 36. The inner insulation component 36 can reduce the risk of short circuits formed between the tab 22, the terminal body 31 and the adapter structure 34 respectively. During the welding process between the tab 22 and the terminal body 31, the contact between the anti-scalding part 37 and the tab 22 can reduce the risk of the inner insulation component 36 being burned or damaged by the tab 22 during the welding process, and improve the insulation performance of the inner insulation component 36.

[0109] Please see Figure 6In some embodiments, the anti-scalding portion 37 is formed by locally thickening the inner insulating member 36. It is understood that after locally thickening the inner insulating member 36, the heat resistance of the inner insulating member 36 is better, thereby giving the inner insulating member 36 better anti-scalding performance.

[0110] The inner insulating component 36 can be made of materials with good heat resistance, such as bakelite or ceramics, so that the entire inner insulating component 36 not only has an insulating effect but also provides good protection against burns. The melting point of the inner insulating component 36 can be, for example, greater than 150°C.

[0111] In the above embodiment, the inner insulating member 36 is locally thickened to form the anti-scalding part 37, which increases the local material of the inner insulating member 36 and improves the anti-scalding performance.

[0112] Please see Figure 5 and Figure 6 In some embodiments, the adapter structure 34 includes a first adapter 341 and a second adapter 342 connected to the first adapter 341. The first adapter 341 is disposed on the first wall 12. The first adapter 341 has a first through hole 3411 and includes an adapter bottom surface 3412 connected to the hole wall of the first through hole 3411. The first through hole 3411 penetrates the first adapter 341 along the first direction X1. The adapter bottom surface 3412 faces the electrode body 21. The inner insulating member 36 is disposed on the adapter bottom surface 3412. The anti-scalding part 37 is disposed near the edge of the first through hole 3411.

[0113] Specifically, the first adapter 341 and the second adapter 342 can be connected by welding, riveting, drilling, or bonding. The first adapter 341 is connected to the first wall 12 by welding, riveting, drilling, or bonding. For example, both the first adapter 341 and the second adapter 342 are made of aluminum and are welded together. The first adapter 341 and the first wall 12 are both made of aluminum and are welded together, which helps to improve the welding yield.

[0114] The shape of the first through hole 3411 can match the shape of the pole body 31. For example, the overall shape of the first through hole 3411 and the pole body 31 includes, but is not limited to, circular, elliptical, racetrack-shaped, rounded rectangle, etc. The first adapter 341 is in the form of a sheet, and the first through hole 3411 penetrates the first adapter 341 along the first direction X1, that is, the first through hole 3411 can penetrate the first adapter 341 along the thickness direction of the first adapter 341.

[0115] In the above embodiments, the adapter structure 34 includes a first adapter 341 and a second adapter 342 for assembly connection, thereby facilitating the assembly connection of the adapter structure 34 with the outer insulation component 33 and the pole body 31, making the pole assembly 30 easy to process and manufacture.

[0116] Please see Figure 5 In some embodiments, the first adapter 341 has a first recessed groove 3413 formed by the recess of the bottom surface 3412 of the adapter. The first recessed groove 3413 communicates with the first through hole 3411. The inner insulating member 36 is at least partially embedded in the first recessed groove 3413. The part of the inner insulating member 36 that is partially thickened corresponds to the first recessed groove 3413. The pole body 31 passes through the first through hole 3411.

[0117] Specifically, the first recess 3413 is disposed at the edge of the first through hole 3411. For example, the first recess 3413 may be disposed around the first through hole 3411. The inner insulating member 36 may be locally thickened using the space of the first recess 3413 and is at least partially embedded in the first recess 3413.

[0118] It should be noted that since the first adapter 341 can be made of a high-strength material such as metal, the first sink 3413 has little impact on the strength of the first adapter 341, and consequently has little impact on the strength of the connection between the first adapter 341 and other components.

[0119] In the above embodiment, the first sink 3413 makes it easy for the inner insulating member 36 to form a local thickening effect, and after the inner insulating member 36 is locally thickened, it occupies less internal space in the housing 10, thus reducing the impact on the energy density reduction of the battery cell 100.

[0120] Please see Figures 5-7 In some embodiments, the inner insulating member 36 is provided with a second through hole 361 and a second recessed groove 362. The second through hole 361 penetrates the inner insulating member 36 along the first direction X1. The second recessed groove 362 is located on the side of the inner insulating member 36 facing the electrode body 21 and communicates with the second through hole 361. A protrusion 371 is provided in the second recessed groove 362. The protrusion 371 corresponds to the locally thickened part of the inner insulating member 36. The anti-scalding part 37 includes the protrusion 371. The electrode body 31 passes through the second through hole 361.

[0121] Specifically, the shape of the second through hole 361 can match the shape of the electrode body 31. For example, the overall shape of the second through hole 361 and the electrode body 31 includes, but is not limited to, circular, elliptical, racetrack-shaped, and rounded rectangular shapes. The inner insulating member 36 is sheet-like, and the second through hole 361 penetrates the inner insulating member 36 along the second direction X2, that is, the second through hole 361 can penetrate the inner insulating member 36 along the thickness direction of the inner insulating member 36. The first direction X1 is, for example, the height direction of the battery cell 100, and the second direction X2 is, for example, the thickness direction of the battery cell 100. The second direction X2 can be perpendicular to the first direction X1.

[0122] The second recess 362 is disposed at the edge of the second through hole 361. For example, the second recess 362 may be disposed around the second through hole 361. Since the protrusion 371 corresponds to the locally thickened portion of the inner insulating member 36, the anti-scalding part 37 includes the protrusion 371, so that the anti-scalding effect of the inner insulating member 36 is also better when the protrusion 371 contacts the tab 22.

[0123] The second recess 362 can reduce the weight of the inner insulating component 36, reduce the contact area between the inner insulating component 36 and the tab 22, and dissipate heat by using the second recess 362 to reduce the temperature rise of the inner insulating component 36.

[0124] Therefore, in the above embodiment, the protrusion 371 of the anti-scalding part 37 is disposed in the second sinker 362, so that during the welding process between the electrode tab 22 and the electrode body 31, the protrusion 371 can exchange heat with the air through the second sinker 362, thereby reducing the temperature rise of the protrusion 371.

[0125] Please see Figure 7 In some embodiments, the second through hole 361 includes a straight edge 3611 and a curved edge 3612 connected to the straight edge 3611, and the number of protrusions 371 is multiple, with the multiple protrusions 371 spaced apart along the extending direction of the straight edge 3611.

[0126] For example, the number of protrusions 371 can be 2, 3, 4, 5, etc. Multiple protrusions 371 can be arranged at equal or unequal intervals. The spaced arrangement of multiple protrusions 371 can reduce the contact area between the tab 22 and the inner insulating component 36. During the welding process between the tab 22 and the electrode body 31, they generally correspond to the straight edge 3611 of the second through hole 361. Multiple protrusions 371 are spaced apart along the extension direction of the straight edge 3611, which can reduce the risk of burns to the inner insulating component 36 from the tab 22.

[0127] Please see Figure 7 In some embodiments, there are two straight edges 3611 and two curved edges 3612. The two straight edges 3611 are arranged opposite each other, and each curved edge 3612 connects the two straight edges 3611. Each straight edge 3611 has a plurality of protrusions 371 on one side.

[0128] Specifically, the second through hole 361 is generally racetrack shaped. The curved edge 3612 of the second through hole 361 can be arc-shaped. Multiple protrusions 371 located on one side of each straight edge 3611 can be symmetrically arranged to make the inner insulating part 36 easier to process.

[0129] In the above embodiment, each straight edge 3611 has multiple protrusions 371 on one side, and the tab 22 can correspond to any straight edge 3611 during the welding process, thereby improving the assembly adaptability of the inner insulating component 36.

[0130] Please see Figure 5 and Figure 8 In some embodiments, the anti-scalding part 37 includes a heat-resistant part 372 disposed on the inner insulating member 36. Specifically, the heat-resistant part 372 is a part with a high melting point. For example, the melting point of the heat-resistant part 372 can be greater than 200°C. The heat-resistant part 372 can be made of materials such as metal, bakelite, or ceramic. The heat-resistant part 372 is sheet-like and can be fixed to the inner insulating member 36 by means of bonding, welding, or other methods.

[0131] Therefore, in the above embodiment, the heat-resistant component 372 has good heat resistance, which allows the anti-scalding portion 37 on the inner insulating component 36 to have anti-scalding properties. In one embodiment, the heat-resistant component 372 is provided on the surface of the protrusion 371. When there are multiple protrusions 371, each protrusion 371 can be provided with a heat-resistant component 372.

[0132] Please see Figure 8 In some embodiments, the inner insulating member 36 is provided with a second through hole 361, which penetrates the inner insulating member 36 along the thickness direction. The heat-resistant member 372 is located at the edge of the second through hole 361, and the pole body 31 is inserted into the second through hole 361.

[0133] In the above embodiment, when the tab 22 is welded to the electrode body 31, the tab 22 can easily cover the edge of the second through hole 361, and the heat-resistant component 372 is located at the edge of the second through hole 361. This allows the tab 22 to come into contact with the heat-resistant component 372 during the welding process, reducing the degree of burns to the inner insulation component 36.

[0134] Please see Figure 8 In some embodiments, the second through hole 361 includes a straight edge 3611 and a curved edge 3612 connected to the straight edge 3611. The number of heat-resistant elements 372 is multiple, and the multiple heat-resistant elements 372 are spaced apart along the extension direction of the straight edge 3611.

[0135] For example, the number of heat-resistant components 372 can be 2, 3, 4, 5, etc. Multiple heat-resistant components 372 can be arranged at equal or unequal intervals. The spacing between multiple heat-resistant components 372 can reduce the contact area between the electrode tab 22 and the inner insulation component 36. During the welding process between the electrode tab 22 and the electrode post body 31, it generally corresponds to the straight edge 3611 of the second through hole 361. Multiple heat-resistant components 372 are spaced apart along the extension direction of the straight edge 3611, which reduces the risk of burns to the inner insulation component 36 from the electrode tab 22.

[0136] Please see Figure 8In some embodiments, there are two straight edges 3611 and two curved edges 3612. The two straight edges 3611 are arranged opposite each other, and each curved edge 3612 connects the two straight edges 3611. Each straight edge 3611 has a plurality of heat-resistant components 372 on one side. For example, the plurality of heat-resistant components 372 located on one side of each straight edge 3611 can be arranged symmetrically to make the inner insulation component 36 easier to process.

[0137] In the above embodiment, each straight edge 3611 is provided with a plurality of heat-resistant components 372 on one side, and the tab 22 can correspond to any straight edge 3611 during the welding process, thereby improving the assembly adaptability of the inner insulating component 36.

[0138] Please see Figures 5-6 as well as Figure 10 In some embodiments, the pole assembly 30 includes an outer insulating member 33 disposed on the adapter structure 34 and isolating the adapter structure 34 from the pole body 31. The adapter structure 34 includes an exposed adapter top surface 3401 facing away from the receiving chamber 11. The outer insulating member 33 includes a circumferential surface 331 surrounding the pole body 31 and connected to the adapter top surface 3401. The circumferential surface 331 extends at least partially from the adapter top surface 3401 along a first direction X1. The total height of the circumferential surface 331 along the first direction X1 is H1. The total height of the outer insulating member 33 from the adapter top surface 3401 along the first direction X1 is H2, where 0.85 ≤ H1 / H2 ≤ 1.

[0139] The outer insulating member 33 insulates the mating position between the adapter structure 34 and the terminal body 31, preventing a short circuit between the terminal body 31 and the adapter structure 34. The top surface 3401 of the adapter can be a plane, and the circumferential surface 331 of the outer insulating member 33 can be perpendicular to the top surface 3401 of the adapter. The first direction X1 is, for example, the same direction as the thickness direction of the first wall 12. Under normal use of the battery cell 100, the circumferential surface 331 can be a vertical surface. The portion of the circumferential surface 331 extending along the first direction X1 is a flat surface. Therefore, it can be understood that when the entire circumferential surface 331 extends from the top surface 3401 along the first direction X1, the entire circumferential surface 331 is a flat surface.

[0140] During the installation of the pole post assembly 30, a clamp can be used to hold the circumferential surface 331, thereby completing the transfer of the pole post assembly 30. The values ​​of H1 / H2 can be 0.85, 0.9, 0.92, 0.95, 1, etc.

[0141] Therefore, in the battery cell 100 of this application embodiment, when the ratio of the total height of the circumferential surface 331 of the outer insulation member 33 to the total height of the outer insulation member 33 is H1 / H2, the total height of the circumferential surface 331 of the outer insulation member 33 is relatively large when 0.85≤H1 / H2≤1. This makes it easier and more stable to clamp the circumferential surface 331 of the outer insulation member 33 to clamp and install the terminal assembly 30 onto the housing 10, thereby improving the assembly efficiency of the battery cell 100.

[0142] In some embodiments, H1 satisfies the condition that H1 ≥ 1.5 mm. For example, the value of H can be 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, etc. In the above embodiments, when H1 is greater than or equal to 1.5 mm, the circumferential surface 331 of the outer insulating member 33 has sufficient height for clamping, which is beneficial for clamping and installing the pole assembly 30 onto the housing 10.

[0143] Please see Figure 10 In some embodiments, the outer insulating member 33 has a recessed groove 332 formed from its circumferential surface 331. Specifically, the groove 332 may extend continuously along the circumference of the outer insulating member 33, or it may have a discontinuous structure along the circumference of the outer insulating member 33. The shape of the groove 332 may be, for example, circular. The depth of the groove 332 is less than the thickness of the outer insulating member 33. In the above embodiments, the groove 332 can reduce the amount of material used in the outer insulating member 33 and reduce the manufacturing cost of the outer insulating member 33.

[0144] Please see Figure 10 In some embodiments, the circumferential surface 331 includes a circumferential edge 3311 away from the top surface 3401, and the groove 332 is closer to the circumferential edge 3311 relative to the top surface 3401. Specifically, the circumferential edge 3311 of the circumferential surface 331 away from the top surface 3401 is the edge location of the circumferential surface 331, thus the circumferential edge 3311 of the circumferential surface 331 forms an annular shape. The circumferential surface 331 extends at least partially from the circumferential edge 3311 toward the top surface 3401 along a first direction X1. When the battery cell 100 is in normal use, the groove 332 is located in the upper half of the circumferential surface 331.

[0145] In the above embodiment, the groove 332 is closer to the circumferential edge 3311 than the top surface 3401 of the adapter, so that the circumferential surface 331 of the outer insulating member 33 has a larger continuous surface along the first direction X1, which is beneficial for the pole assembly 30 to be clamped.

[0146] Please see Figure 10In some embodiments, the outer insulating member 33 includes an insulating end face 333 opposite to the top surface 3401 of the transition, H2 is the distance between the insulating end face 333 and the top surface 3401 of the transition, and the insulating end face 333 and the circumferential surface 331 are circularly transitioned.

[0147] Specifically, the insulating end face 333 can be arranged parallel to the transition top surface 3401. The total height of the outer insulating member 33 along the first direction X1 from the transition top surface 3401 is also the distance between the insulating end face 333 and the transition top surface 3401. Since the outer insulating member 33 can be formed by plastic injection molding, in the above embodiment, the insulating end face 333 and the circumferential surface 331 have a rounded transition, which makes the outer insulating member 33 easier to manufacture and helps to reduce the manufacturing cost of the outer insulating member 33.

[0148] Please see Figure 5 and Figure 10 In some embodiments, the electrode body 31 protrudes from the insulating end face 333. Generally, the electrode body 31 can be welded to an external electrical component (e.g., a switch plate). The electrode body 31 protrudes from the insulating end face 333 of the external insulator 33, making it easy to connect the electrode body 31 to the external electrical component.

[0149] Please see Figures 5-6 In some embodiments, the adapter structure 34 includes a first adapter 341 and a second adapter 342 connected to the first adapter 341. The first adapter 341 is disposed on the first wall 12. The second adapter 342 presses against the pole body 31 through an outer insulating member 33. The second adapter 342 includes an adapter top surface 3401. The outer insulating member 33 covers at least a portion of the second adapter 342 and isolates the outer insulating member 33 from the pole body 31.

[0150] The method by which the second adapter 342 is insulated from and fixedly engaged with the pole body 31 via the outer insulating member 33 is not limited. For example, the outer insulating member 33 and the second adapter 342 can be injection molded separately. As another example, at least a portion of the outer insulating member 33 is sandwiched between the second adapter 342 and the pole body 31 along the inward and outward directions of the first wall 12. The material of the outer insulating member 33 is not limited, and it can be, for example, a plastic part or an elastic rubber part.

[0151] In the above embodiments, the adapter structure 34 includes a first adapter 341 and a second adapter 342 for assembly connection, thereby facilitating the assembly connection of the adapter structure 34 with the outer insulation component 33 and the pole body 31, making the pole assembly 30 easy to process and manufacture.

[0152] Please see Figure 5 and Figure 6In some embodiments, the pole assembly 30 includes a seal 35 disposed between the first adapter 341 and the pole body 31, the seal 35 sealing the gap between the first adapter 341 and the pole body 31.

[0153] Specifically, the seal 35 is made of a material that has both sealing and insulating properties, such as an elastic rubber component. The pole body 31 passes through the first adapter 341, and the seal 35 may be partially located between the side of the pole body 31 and the opening of the first adapter 341, thereby insulating the first adapter 341 and the pole body 31 in a direction perpendicular to the thickness of the first wall 12.

[0154] In the above embodiment, the seal 35 seals the gap between the first adapter 341 and the pole body 31, which can improve the sealing effect between the pole body 31 and the first adapter 341, improve the leakage problem at the mating position of the first adapter 341 and the pole body 31, and achieve the effect of insulation between the first adapter 341 and the pole body 31.

[0155] Please see Figure 5 and Figure 6 In some embodiments, the battery cell 100 includes an insulating support 40 disposed on the inner side of the first wall 12. The insulating support 40 covers the inner insulating member 36 and the transition structure 34. The insulating support 40 is provided with a through hole 41, and the electrode tab 22 passes through the through hole 41.

[0156] Specifically, the insulating support 40 abuts against the end of the first wall 12 facing the electrode body 21. The insulating support 40 can indirectly support the free end of the tab 22 through the first wall 12, thereby improving the reliability of supporting the free end of the tab 22, further reducing the probability of the tab 22 being inserted into the electrode body 21 and contacting the first wall 12, reducing the risk of short circuit, and improving the reliability of the battery cell 100.

[0157] In the above embodiment, since the insulating bracket 40 covers the inner insulating element 36 and the transition structure 34, the insulating bracket 40 can insulate and separate the electrode body 21 from the transition structure 34, reducing the risk of short circuit between the transition structure 34 and the electrode body 21 and improving the reliability of the battery cell 100.

[0158] Please see Figure 5 and Figure 6 In some embodiments, the insulating support 40 includes a connecting portion 42 and a covering portion 43 connected to the connecting portion 42. The covering portion 43 covers the inner insulating member 36 and the transition structure 34. The connecting portion 42 is bent relative to the covering portion 43, and one end of the connecting portion 42 away from the covering portion 43 is connected to the first wall 12.

[0159] Specifically, the connecting portion 42 can be an annular strip. The connecting portion 42 and the covering portion 43 can be an integral structure. The connecting portion 42 can be fixed to the inner side of the first wall 12 by means of bonding or other methods. The covering portion 43 is provided with a through hole 41, and the electrode tab 22 can pass through the through hole 41 of the covering portion 43, so that the covering portion 43 can provide a certain support for the electrode tab 22. The covering portion 43 can insulate and separate the free end of the electrode tab 22 from the electrode body 21, reduce the risk of the free end of the electrode tab 22 being inserted into the electrode body 21, reduce the risk of short circuit, and improve the reliability of the battery cell 100.

[0160] Thus, the connecting part 42 facilitates the mounting of the insulating bracket 40 on the first wall 12, and the covering part 43 can cover the inner insulating member 36 and the transition structure 34.

[0161] Please see Figure 5 , Figure 6 and Figure 11 In some embodiments, a blocking strip 50 is provided between the inner insulating member 36 and the covering portion 43. The blocking strip 50 extends at least partially along a third direction X3, which intersects with the first direction X1.

[0162] Specifically, the blocking strip 50 can be straight, and the third direction X3 is, for example, the width direction of the battery cell 100. The third direction X3 can be perpendicular to the first direction X1. Generally, the tab 22 includes multiple sheets, which are stacked and then bent after being welded to the electrode body 31. If one or more sheets of the tab 22 are not firmly welded and become loose, they may extend towards the first wall 12 and short-circuit upon contact with it. Therefore, in the above embodiment, the blocking strip 50 can reduce the risk of the tab 22 being inserted through the gap between the inner insulator 36 and the insulating support 40 and contacting the first adapter 341 or the first wall 12, thus forming a short circuit.

[0163] Please see Figure 6 , Figure 7 and Figure 11 In some embodiments, the blocking strip 50 is fixed to the inner insulating member 36. For example, the blocking strip 50 may be integrally formed with the inner insulating member 36. Alternatively, the blocking strip 50 may be fixed to the inner insulating member 36 by means of bonding, welding, or other methods. Thus, in the above embodiments, the blocking strip 50 is easy to manufacture.

[0164] Please see Figures 5-7In some embodiments, the covering portion 43 includes a first covering segment 431, a second covering segment 432 and a third covering segment 433 connected in sequence. The first covering segment 431 is connected to the connecting portion 42. The second covering segment 432 is bent relative to the first covering segment 431. The third covering segment 433 is provided with a through hole 41. The blocking strip 50 is opposite to the second covering segment 432 in the first direction X1.

[0165] Specifically, the first covering section 431, the second covering section 432, and the third covering section 433 can be an integral structure. The covering portion 43 is configured as multiple structurally different parts, which facilitates welding of the tab 22 to the electrode body 31 and effectively isolates the electrode body 21 from the adapter structure 34. Therefore, in the above embodiment, the gap between the second covering section 432 and the inner insulating member 36 is relatively large, increasing the probability that the tab 22 will extend from this gap into the first adapter 341. The blocking strip 50 is opposite to the second covering section 432 in the first direction X1, effectively blocking the extension path of the tab 22 and reducing the risk of a short circuit caused by contact between the tab 22 and the first adapter 341 or the first wall 12.

[0166] Please see Figures 5-7 and Figure 11 In some embodiments, the projections of the blocking strip 50 and the first covering segment 431 along the second direction X2 have overlapping portions, and the first direction X1, the second direction X2 and the third direction X3 intersect each other.

[0167] Generally, the first cover section 431 and the inner insulating member 36 are partially stacked, and the first cover section 431 can contact the inner insulating member 36. However, due to manufacturing tolerances, a small gap may be formed between the first cover section 431 and the second insulating part. After the tab 22 passes through the gap between the first cover section 431 and the inner insulating member 36, it can contact the transition structure 34 and the first wall 12, thereby forming a short circuit.

[0168] Therefore, in the above embodiment, the blocking strip 50 can prevent the electrode tab 22 from extending directly towards the first shielding part along the second direction X2, and then contacting the first adapter 341 and the first wall 12.

[0169] Please see Figure 11 In some embodiments, the minimum distance between the blocking strip 50 and the second covering section 432 is D, where D ≤ 0.052 mm. For example, D can be 0.052 mm, 0.05 mm, 0.04 mm, 0.03 mm, 0.02 mm, etc. In the above embodiments, the distance between the blocking strip 50 and the second covering section 432 is small, which can effectively block the tab 22.

[0170] Please see Figure 11In some embodiments, the height of the barrier strip 50 protruding from the inner insulating member 36 along the first direction X1 is H3, where H3 ≥ 0.6 mm. For example, H3 can be 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc. In the above embodiments, when the height of the barrier strip 50 is within the above range, it is beneficial to manufacture and shape the barrier strip 50.

[0171] Please see Figure 5 In some embodiments, the blocking strip 50 is fixed to the insulating support 40. For example, the blocking strip 50 can be an integral structure with the insulating support 40. In this way, the blocking strip 50 is positioned stably, which can improve the effect of the blocking strip 50 in preventing the tab 22 from contacting the first adapter 341.

[0172] Please see Figure 5 and Figure 8 In some embodiments, the inner insulating member 36 is provided with an embedding groove 363, and the blocking strip 50 is at least partially embedded in the embedding groove 363. In the above embodiments, the blocking strip 50 is at least partially embedded in the embedding groove 363, which can block the path of the electrode tab 22 extending from the gap between the inner insulating member 36 and the insulating support 40 to the first adapter 341, reducing the risk of short circuit due to contact between the electrode tab 22 and the first adapter 341.

[0173] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, include: A housing having a receiving chamber and including a first wall; An electrode assembly, the electrode assembly comprising an electrode body and a tab connected to the electrode body; An electrode assembly includes an adapter structure, an electrode body, and an inner insulating member. The adapter structure is disposed on the first wall, the electrode body is disposed on the adapter structure and connected to the electrode tab, and the inner insulating member is located in the receiving cavity and disposed on the side of the adapter structure facing the electrode body. The side of the inner insulating member facing the electrode body is provided with an anti-scalding part, which is disposed on the side of the inner insulating member adjacent to the electrode body.

2. The battery cell of claim 1, wherein, The heat-resistant part is formed by locally thickening the inner insulating element.

3. The battery cell of claim 2, wherein, The adapter structure includes a first adapter and a second adapter connected to the first adapter. The first adapter is disposed on the first wall. The first adapter has a first through hole and includes an adapter bottom surface connected to the hole wall of the first through hole. The adapter bottom surface faces the electrode body. The first through hole penetrates the first adapter along a first direction. The inner insulating member is disposed on the adapter bottom surface. The anti-scalding part is disposed near the edge of the first through hole.

4. The battery cell of claim 3, wherein, The first adapter has a first recessed groove formed from the bottom surface of the adapter. The first recessed groove is connected to the first through hole. The inner insulating member is at least partially embedded in the first recessed groove. The locally thickened part of the inner insulating member corresponds to the first recessed groove. The pole body passes through the first through hole.

5. The battery cell of any one of claims 2-4, wherein, The inner insulating component is provided with a second through hole and a second recessed groove. The second through hole penetrates the inner insulating component along a first direction. The second recessed groove is located on the side of the inner insulating component facing the electrode body and communicates with the second through hole. A protrusion is provided in the second recessed groove. The protrusion corresponds to a locally thickened part of the inner insulating component. The anti-scalding part includes the protrusion. The electrode body passes through the second through hole.

6. The battery cell of claim 5, wherein, The second through hole includes a straight edge and a curved edge connected to the straight edge, and there are multiple protrusions, which are spaced apart along the extension direction of the straight edge.

7. The battery cell of claim 6, wherein, The number of straight edges and curved edges are both two. The two straight edges are arranged opposite each other. Each curved edge connects the two straight edges. Each straight edge has a plurality of protrusions on one side.

8. The battery cell of claim 1, wherein, The anti-scalding part includes a heat-resistant component disposed on the inner insulation component.

9. The battery cell of claim 8, wherein, The inner insulating component is provided with a second through hole, which penetrates the inner insulating component along its thickness direction. The heat-resistant component is located at the edge of the second through hole, and the pole body is inserted into the second through hole.

10. The battery cell of claim 9, wherein, The second through hole includes a straight edge and a curved edge connected to the straight edge. The number of heat-resistant components is multiple, and the multiple heat-resistant components are spaced apart along the extension direction of the straight edge.

11. The battery cell of claim 10, wherein, The number of straight edges and curved edges are both two. The two straight edges are arranged opposite each other. Each curved edge connects the two straight edges. Each straight edge has multiple heat-resistant components on one side.

12. The battery cell of claim 1, wherein, The pole assembly includes an outer insulating member disposed on the adapter structure and isolating the adapter structure from the pole body. The adapter structure includes an exposed top surface facing away from the receiving chamber. The outer insulating member includes a circumferential surface surrounding the pole body and connected to the top surface of the adapter. The circumferential surface extends at least partially from the top surface of the adapter along a first direction. The total height of the circumferential surface along the first direction is H1. The total height of the outer insulating member from the top surface of the adapter along the first direction is H2, where 0.85 ≤ H1 / H2 ≤ 1.

13. The battery cell of claim 12, wherein, H1 satisfies the condition that H1 ≥ 1.5 mm.

14. The battery cell according to claim 12, characterized in that, The outer insulating component has a groove formed by recessing from the circumferential surface.

15. The battery cell of claim 14, wherein, The circumferential surface includes a circumferential edge away from the top surface of the transition, and the groove is closer to the circumferential edge relative to the top surface of the transition.

16. The battery cell of any one of claims 12-15, wherein, The external insulating component includes an insulating end face opposite to the top surface of the adapter, H2 is the distance between the insulating end face and the top surface of the adapter, and the insulating end face transitions to the circumferential surface by an arc.

17. The battery cell of claim 16, wherein, The pole body protrudes from the insulating end face.

18. The battery cell of any one of claims 12-15, wherein, The adapter structure includes a first adapter and a second adapter connected to the first adapter. The first adapter is disposed on the first wall. The second adapter presses against the pole body through the outer insulating member. The second adapter includes the top surface of the adapter. The outer insulating member covers at least a portion of the second adapter and isolates the outer insulating member from the pole body.

19. The battery cell of claim 18, wherein, The pole assembly includes a seal disposed between the first adapter and the pole body, the seal sealing the gap between the first adapter and the pole body.

20. The battery cell of claim 1, wherein, The battery cell includes an insulating support, which is disposed on the inner side of the first wall. The insulating support covers the inner insulating component and the adapter structure. The insulating support has a through hole, and the electrode tab passes through the through hole.

21. The battery cell of claim 20, wherein, The insulating support includes a connecting portion and a covering portion connected to the connecting portion. The covering portion covers the inner insulating member and the transition structure. The connecting portion is bent relative to the covering portion. One end of the connecting portion away from the covering portion is connected to the first wall.

22. The battery cell of claim 21, wherein, A blocking strip is provided between the inner insulating element and the covering portion, and the blocking strip extends at least partially in a third direction.

23. The battery cell of claim 22, wherein, The blocking strip is fixed to the inner insulating component.

24. The battery cell of claim 23, wherein, The covering part includes a first covering section, a second covering section and a third covering section connected in sequence. The first covering section is connected to the connecting part. The second covering section is bent relative to the first covering section. The third covering section is provided with the through hole. The blocking strip is opposite to the second covering section in a first direction.

25. The battery cell of claim 24, wherein, The projections of the blocking strip and the first covering segment along the second direction have an overlapping portion, and the first direction, the second direction, and the third direction intersect each other.

26. The battery cell of claim 24 or 25, wherein, The minimum distance between the blocking strip and the second covering section is D, where D≤0.052mm.

27. The battery cell of any one of claims 23-25, wherein, The height of the barrier strip protruding from the inner insulating member is H3, where H3 ≥ 0.6 mm.

28. The battery cell of claim 22, wherein, The blocking strip is fixed to the insulating bracket.

29. The battery cell of claim 28, wherein, The inner insulating component is provided with an embedding groove, and the blocking strip is at least partially embedded in the embedding groove.

30. A battery device, characterized by It includes the battery cells described in any one of claims 1-29.

31. An electrical device, comprising: Includes the battery cell described in any one of claims 1-29, or the battery device described in claim 30.

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