Battery cell, battery device, and electric device

Abstract

The present application discloses a battery cell, a battery device, and an electric device. The battery cell comprises a casing, an electrode component, and a first insulating member. The casing has a first wall, and the first wall is provided with a liquid injection hole. The electrode component is arranged in the casing. The first insulating member is arranged in the casing and located between the first wall and the electrode component, the first insulating member comprises an insulating body and a first boss, the first boss is formed on the side of the insulating body facing the electrode component and is located at an end of the insulating body in a first direction, the insulating body is provided with a first through hole corresponding to the liquid injection hole in position, and the first direction is perpendicular to the thickness direction of the first wall. In the first direction, a first accommodating recess is formed on the side of the first boss close to the first through hole. The technical solution provided in the present application can effectively improve the manufacturing efficiency of the battery device.

Description

Battery cells, battery packs and electrical devices Cross-references to related applications

[0001] This application claims priority to Chinese patent application 202411535259.6, filed on October 30, 2024, entitled “Battery Cell, Battery Device and Power Consumption Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery device, and an electrical device. Background Technology

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0004] In the development of battery technology, how to improve the manufacturing efficiency of battery devices is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] This application provides a battery cell, a battery device, and an electrical device. The technical solution provided by this application can effectively improve the manufacturing efficiency of the battery device.

[0006] This application is achieved through the following technical solution:

[0007] In a first aspect, some embodiments of this application provide a battery cell, which includes a housing, an electrode assembly, and a first insulating member. The housing has a first wall with a liquid injection hole. The electrode assembly is disposed within the housing. The first insulating member is disposed within the housing and located between the first wall and the electrode assembly. The first insulating member includes an insulating body and a first boss. The first boss is formed on the side of the insulating body facing the electrode assembly and located at one end of the insulating body in a first direction. The insulating body has a first through hole corresponding to the position of the liquid injection hole. The first direction is perpendicular to the thickness direction of the first wall. Along the first direction, a first receiving groove is formed on the side of the first boss near the first through hole.

[0008] In the above scheme, the electrolyte enters the battery cell through the first through hole of the injection aperture. By forming a first receiving groove on the side of the first protrusion near the first through hole, additional space can be provided for the electrolyte to enter the battery cell, thereby enabling more electrolyte to be injected in a certain period of time, improving the electrolyte injection efficiency, and making the battery cell have higher manufacturing efficiency, which in turn helps to improve the manufacturing efficiency of the battery device.

[0009] According to some embodiments of this application, the first receiving groove does not penetrate the first boss along the first direction.

[0010] In the above scheme, the first receiving groove is a blind hole structure. The end of the first receiving groove away from the first through hole does not penetrate the first boss. This can reduce the loss of structural strength of the first insulating component due to the setting of the groove structure to a certain extent, which is beneficial to the structural reliability of the first insulating component, and thus beneficial to the improvement of the reliability of the battery cell.

[0011] According to some embodiments of this application, the first receiving groove is open to the side of the electrode assembly along the thickness direction of the first wall.

[0012] In the above scheme, by setting the side of the first receiving tank facing the electrode assembly to be open, it is possible for the electrolyte to enter the electrode assembly, resulting in high electrolyte injection efficiency and improving the manufacturing efficiency of the battery cell.

[0013] According to some embodiments of this application, the first insulating member further includes a second boss, which is formed on the side of the insulating body facing the electrode assembly, and the second boss is located at the other end of the insulating body in the first direction. Along the first direction, a second receiving groove is provided on the side of the second boss facing the first through hole.

[0014] In the above solution, by providing a second protrusion at the other end of the first insulating member along the first direction, and providing a second receiving groove on the side of the second protrusion facing the first through hole, it can restrict the movement of the electrode assembly and provide more space for the electrolyte, thereby improving the electrolyte injection efficiency and thus improving the battery cell manufacturing efficiency.

[0015] According to some embodiments of this application, along the first direction, the first boss is closer to the first through hole than the second boss, the width of the first receiving groove along the second direction is greater than the width of the second receiving groove along the second direction, and the first direction, the second direction and the thickness direction of the first wall are perpendicular to each other.

[0016] In the above scheme, the first receiving tank is closer to the electrolyte injection position than the second receiving tank. To this end, by setting the width of the first receiving tank along the second direction to be larger, it can more timely contain the electrolyte injected through the first through hole, thereby allowing more electrolyte to be injected within a certain period of time, which is conducive to improving the electrolyte injection efficiency and thus improving the battery device manufacturing efficiency.

[0017] According to some embodiments of this application, the width of the first receiving groove along the second direction is K2, and the width of the second receiving groove along the second direction is K3, satisfying 0.05≤(K2-K3) / K2≤0.2.

[0018] In the above scheme, the width of the first receiving tank along the second direction is greater than the width of the second receiving tank along the second direction. This limits the width of the first receiving tank to be greater than the width of the second receiving tank by not less than 0.5% and not more than 20%. This can balance the fact that the first receiving tank can hold more electrolyte and that the structural strength loss of the first insulating component is small, thereby improving the manufacturing efficiency of the battery cell and the reliability of the battery cell.

[0019] According to some embodiments of this application, there are multiple first receiving grooves, which are arranged at intervals along the second direction, and the first direction, the second direction and the thickness direction of the first wall are perpendicular to each other.

[0020] In the above scheme, by setting up multiple first receiving tanks and arranging them at intervals along the second direction, the electrolyte injected through the injection hole and the first through hole can be quickly contained, thereby meeting the need for faster electrolyte injection speed, improving injection efficiency, and thus improving the manufacturing efficiency of battery cells.

[0021] According to some embodiments of this application, along the second direction, the first boss includes a first wall portion, a second wall portion, a third wall portion, and a first protrusion. The first wall portion and the second wall portion are spaced apart along the second direction. The end of the first wall portion away from the first through hole and the end of the second wall portion away from the first through hole are connected through the third wall portion. Along the second direction, the first protrusion is located between the first wall portion and the second wall portion. Along the second direction, the first protrusion and the first wall portion are spaced apart and form a first receiving groove, and the first protrusion and the second wall portion are spaced apart and form a first receiving groove.

[0022] In the above scheme, the first boss includes a first wall portion, a second wall portion, a third wall portion and a first protrusion. A first receiving groove can be formed between the first wall portion and the first protrusion, and another first receiving groove can be formed between the second wall portion and the first protrusion. This can quickly accommodate the electrolyte injected through the injection hole and the first through hole, thereby meeting the requirement for a faster electrolyte injection speed, improving the injection efficiency, and thus improving the manufacturing efficiency of the battery cell.

[0023] According to some embodiments of this application, the battery cell further includes a second insulating member, at least a portion of which covers the electrode assembly, and the second insulating member is connected to at least one of the outer surface of the first wall, the outer surface of the second wall, and the outer surface of the third wall.

[0024] In the above scheme, by setting a second insulating component to wrap the electrode assembly, the electrode assembly can be protected and insulated, which can ensure the reliability of the electrode assembly to a certain extent, reduce the risk of short circuit between the electrode assembly and the shell, and make the battery cell highly reliable, thereby making the battery device highly reliable.

[0025] According to some embodiments of this application, a first protrusion protrudes from the first wall portion, the second wall portion, and the third wall portion along the direction of the first wall pointing towards the electrode assembly.

[0026] In the above solution, by setting the first protrusion to protrude from the first wall, the second wall, and the third wall, on the one hand, the first protrusion can be used to restrict the movement of the electrode assembly, thereby stabilizing the internal structure and internal circuit of the battery cell; on the other hand, by keeping the first wall, the second wall, and the third wall away from the electrode assembly, the risk of damage to the electrode structure caused by the insertion of the first wall, the second wall, and the third wall into the electrode assembly can be reduced, thereby making the battery cell highly reliable.

[0027] According to some embodiments of this application, along the thickness direction of the first wall, the side of the first wall facing the electrode assembly, the side of the second wall facing the electrode assembly, and the side of the third wall facing the electrode assembly are flush with each other.

[0028] In the above solution, by setting the side of the first wall facing the electrode assembly, the side of the second wall facing the electrode assembly, and the side of the third wall facing the electrode assembly to be flush with each other, the structural consistency of the first boss can be provided, the manufacturing difficulty of the first insulating component can be reduced, and the manufacturing efficiency of the battery cell can be improved.

[0029] According to some embodiments of this application, in the direction from the first wall to the electrode assembly, the first protrusion protrudes from the first wall by an amount not less than 0.2 mm and not more than 3 mm.

[0030] In the above solution, by setting the size of the first protrusion protruding from the first wall to not less than 0.2 mm, the risk of damage to the electrode sheet caused by inserting the first wall, second wall and third wall into the electrode assembly can be effectively reduced; by setting the size of the first protrusion protruding from the first wall to not more than 3 mm, the space occupied by the first protrusion between the insulating body and the electrode assembly can be reduced, and the first wall, second wall and / or third wall can have sufficient space to connect the second insulating member.

[0031] According to some embodiments of this application, the width of the first insulating member along the second direction is K1, and the width of the first receiving groove along the second direction is K2, satisfying 0.1≤K2 / K1≤0.6, and the first direction, the second direction and the thickness direction of the first wall are mutually perpendicular.

[0032] In the above scheme, the width of the first receiving groove along the second direction is not less than 0.1 and not more than 0.6 of the size of the first insulating component along the second direction. On the one hand, this allows the first receiving groove to contain electrolyte, thereby improving the electrolyte injection efficiency; on the other hand, it can reduce the loss of structural strength of the first insulating component caused by setting the first receiving groove to a certain extent, thereby taking into account both the manufacturing efficiency and reliability of the battery cell.

[0033] According to some embodiments of this application, the battery cell further includes a pressure relief mechanism disposed on the first wall; the electrode assembly includes an electrode sheet having a flat region, the flat region being stacked along a second direction, the first direction, the second direction, and the thickness direction of the first wall being mutually perpendicular. The first insulating member further includes a third boss having a first surface facing the electrode assembly, the first surface being provided with a second through hole, the second through hole penetrating the first insulating member along the thickness direction of the first wall, the length direction of the first through hole intersecting the first direction.

[0034] In the above scheme, by setting a second through hole on the third protrusion, on the one hand, it is convenient for the gas inside the battery cell to pass through the first insulating component and be discharged by the pressure relief mechanism, thereby reducing the risk of thermal runaway of the battery cell; on the other hand, setting the length direction of the second through hole to intersect with the length direction of the electrode in the flat area can effectively reduce the risk of the electrode inserting into the second through hole and causing damage to the electrode structure, resulting in a short circuit inside the battery cell, thereby improving the reliability of the battery cell and thus making the battery device highly reliable.

[0035] According to some embodiments of this application, the length direction of the second through hole and the second direction are parallel to each other.

[0036] In the above scheme, the second direction is the stacking direction of the electrode in the flat region. This scheme is perpendicular to the length direction of the electrode in the flat region. In this regard, by making the length direction of the second through hole and the second direction parallel to each other, the second through hole and the electrode corresponding to the second through hole can be arranged perpendicularly and staggered, which effectively reduces the risk of structural damage caused by the electrode inserting into the second through hole, resulting in a short circuit inside the battery cell. This can improve the reliability of the battery cell and thus make the battery device highly reliable.

[0037] According to some embodiments of this application, the width of the second through hole is not less than 0.5 mm and not more than 5 mm.

[0038] In the above solution, by setting the width of the second through hole to be no less than 0.5 mm, gas inside the battery cell can pass through the hole and be discharged by the pressure relief mechanism, which is beneficial to improving the reliability of the battery cell and the battery device. By setting the width of the second through hole to be no more than 5 mm, the risk of electrode damage caused by inserting the electrode into the second through hole can be reduced, and the impact on the structural strength of the first insulating component due to an excessively large second through hole size can be reduced, which is beneficial to improving the structural stability of the internal structure of the battery cell, thereby improving the reliability of the battery device. Therefore, setting the width of the second through hole to be no less than 0.5 mm and no more than 5 mm can balance the pressure relief capacity of the battery cell and the stability of the internal structure of the battery cell, thus benefiting the reliability of the battery device.

[0039] According to some embodiments of this application, along the thickness direction of the first wall, the projection of the pressure relief mechanism on the first insulating member at least partially covers the second through hole.

[0040] In the above scheme, the location of the second through hole corresponds to the location of the pressure relief mechanism, which allows the internal gas of the battery cell to quickly pass through the second through hole and be discharged to the outside through the pressure relief mechanism, resulting in high pressure relief efficiency of the battery cell, thereby improving the reliability of the cell and thus improving the reliability of the battery device.

[0041] According to some embodiments of this application, a first groove corresponding to the position of the third boss is formed on the side of the first insulating member facing the first wall, and a second through hole is disposed on the bottom wall of the first groove.

[0042] In the above solution, by setting a first groove on the side of the first insulating member away from the electrode assembly, and the position of the first groove corresponding to the position of the third protrusion, on the one hand, the pressure relief mechanism can be avoided, reducing the interference of the pressure relief mechanism on the second through hole; on the other hand, a cavity can be formed between the pressure relief mechanism and the third protrusion to accommodate the gas passing through the second through hole, thereby facilitating the pressure relief mechanism to discharge the gas inside the battery cell, which in turn helps to improve the reliability of the battery device.

[0043] According to some embodiments of this application, the first insulating member has a second surface facing the electrode assembly, and the first surface protrudes from the second surface in the direction of the first wall pointing towards the electrode assembly. The second surface is provided with a third through hole, and the projection of the pressure relief mechanism on the first insulating member at least partially covers the third through hole along the thickness direction of the first wall.

[0044] In the above scheme, by setting a third through hole, the path of gas inside the battery cell through the first insulating component and discharged by the pressure relief mechanism can be increased, thereby improving the pressure relief efficiency of the battery cell, making the battery cell more reliable, and thus making the battery device more reliable.

[0045] According to some embodiments of this application, the length direction of the third through hole intersects the length direction of the second through hole.

[0046] In the above scheme, the second surface is far away from the electrode assembly relative to the first surface. Therefore, the second surface does not need to contact the electrode assembly relative to the first surface, thus reducing the risk of the electrode inserting into the second surface. By setting the length direction of the third through hole to intersect with the length direction of the second through hole, the structural strength of the first insulating component can be improved, and the risk of the first insulating component being deformed by internal pressure and interfering with other structural components of the battery cell can be reduced.

[0047] According to some embodiments of this application, the length direction of the second through hole is parallel to the second direction, and the length direction of the third through hole is parallel to the first direction.

[0048] In the above scheme, on the one hand, by making the length direction of the second through hole parallel to the second direction, the second through hole and the corresponding electrode are arranged perpendicularly and staggered, which effectively reduces the risk of structural damage caused by the electrode inserting into the second through hole, resulting in a short circuit inside the battery cell, thereby improving the reliability of the battery cell and thus making the battery device highly reliable. On the other hand, by setting the length direction of the third through hole to be parallel to the first direction, that is, perpendicular to the length direction of the second through hole, two kinds of through holes are formed in a cross pattern on the first insulating member, which can improve the overall strength of the first insulating member, making the internal structure of the battery cell stable and conducive to improving the reliability of the battery device.

[0049] According to some embodiments of this application, a second groove is formed on the side of the first insulating member facing the first wall. On a projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the second groove and the orthographic projection of the pressure relief mechanism at least partially overlap. The first groove and the third through hole are both formed on the bottom wall of the second groove.

[0050] In the above solution, by setting a second groove on the side of the first insulating member away from the electrode assembly, on the one hand, the pressure relief mechanism can be avoided, reducing the interference of the pressure relief mechanism on the second and third through holes. On the other hand, a cavity can be formed between the pressure relief mechanism and the second and third through holes to accommodate the gas passing through the second and third through holes, thereby facilitating the pressure relief mechanism to discharge the gas inside the battery cell, which in turn helps to improve the reliability of the battery device.

[0051] According to some embodiments of this application, the battery cell further includes a blocking member disposed on the side of the first insulating member facing the electrode assembly along the thickness direction of the first wall. The blocking member is configured to at least partially block the first through hole and allow fluid medium to flow through the blocking member to the electrode assembly.

[0052] In the above solution, by setting a blocking component at the position corresponding to the first through hole, the electrolyte can be restricted from directly acting on the electrode assembly, reducing the risk of structural damage to the electrode assembly due to direct impact from the electrolyte, resulting in high internal structural stability of the battery cell and improving the reliability of the battery device.

[0053] According to some embodiments of this application, the blocking member is provided with a liquid outlet, the orientation of which is perpendicular to the thickness direction of the first wall, and the orientation of which intersects with the second direction.

[0054] In the above scheme, the electrolyte is discharged from the outlet of the blocking component. By setting the orientation of the outlet to intersect with the second direction, the electrolyte can be discharged to the side with a larger space between the first insulating component and the electrode assembly, so that more electrolyte can be injected into the casing within a certain period of time, thereby making the electrolyte injection efficiency high and thus improving the reliability of the battery device.

[0055] According to some embodiments of this application, the orientation of the liquid outlet is parallel to the first direction.

[0056] In the above scheme, the first direction can be the length direction of the first wall. In the first direction, the space between the first insulating member and the electrode assembly is relatively large. Therefore, the liquid outlet is set to face the first direction, which can effectively improve the liquid injection efficiency of the electrolyte and help improve the reliability of the battery device.

[0057] According to some embodiments of this application, the liquid outlet is positioned facing the third protrusion.

[0058] In the above scheme, by setting the outlet towards the third protrusion, the electrolyte discharged from the outlet can pass through the through hole on the third protrusion, thereby increasing the length of the electrolyte injection path. This allows more electrolyte to be injected into the casing within a certain time, thereby improving the electrolyte injection efficiency and the manufacturing efficiency of the battery cell.

[0059] According to some embodiments of this application, the third boss is located in the middle of the first insulating member along the first direction.

[0060] In the above scheme, by setting the third protrusion in the middle of the first insulating member, on the one hand, it is beneficial for the gas inside the battery cell to be discharged in the middle of the first insulating member and discharged through the pressure relief mechanism; on the other hand, it enables the liquid outlet to face the side with a larger space between the first insulating member and the electrode assembly, thereby allowing more electrolyte to be injected into the casing within a certain period of time, thereby improving the electrolyte injection efficiency and the manufacturing efficiency of the battery cell.

[0061] According to some embodiments of this application, the blocking member includes a bottom wall and a side wall. Along the thickness direction of the first wall, one end of the side wall surrounds the first through hole, and the other end of the side wall is connected to the bottom wall. An outlet is formed in the side wall.

[0062] In the above scheme, the blocking component has a simple structure. By blocking the bottom wall and side wall, the electrolyte can be restricted to be discharged only from the outlet, thereby controlling the direction of electrolyte discharge, which can improve the electrolyte injection efficiency and thus help improve the manufacturing efficiency of battery cells.

[0063] According to some embodiments of this application, along the circumference of the first through hole, the central angle α corresponding to the liquid outlet is not less than 50° and not greater than 270°.

[0064] In the above scheme, by setting the size of the central angle corresponding to the liquid outlet to not less than 50°, the electrolyte can be discharged from the liquid outlet at a faster speed, which is conducive to improving the liquid injection efficiency; by setting the size of the central angle corresponding to the liquid outlet to not more than 50°, the impact of setting the liquid outlet on the structural strength of the blocking component can be reduced.

[0065] According to some embodiments of this application, the blocking member is integrally formed with the first insulating member.

[0066] In the above scheme, by making the blocking component and the first insulating component integrally molded, the structural strength of the first insulating component and the blocking component can be high, so as to adapt to higher injection pressure, thereby improving the injection efficiency.

[0067] According to some embodiments of this application, the capacity of a single battery cell is greater than or equal to 500Ah.

[0068] The battery cell provided by the above solution has a high liquid injection efficiency. When the capacity of the battery cell is greater than or equal to 500Ah, it can effectively improve the liquid injection efficiency of this type of battery cell, thereby effectively improving the manufacturing efficiency of this type of battery cell and the battery device using this type of battery cell.

[0069] According to some embodiments of this application, the outer shell is a square shell, the dimension of the outer shell in the first direction is W1, the dimension of the outer shell in the second direction is T1, and the dimension of the outer shell in the thickness direction of the first wall is H1, satisfying 3720cm. 3 ≤W1*T1*H1≤12500cm 3 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm, the first direction, the second direction and the thickness direction of the first wall are perpendicular to each other.

[0070] According to some embodiments of this application, the outer casing is a steel casing.

[0071] Secondly, some embodiments of this application also provide a battery device, which includes the battery cell provided in the first aspect.

[0072] Thirdly, some embodiments of this application also provide an electrical device, which includes a battery cell provided in the first aspect and / or a battery device provided in the second aspect, wherein the battery cell is used to provide electrical energy.

[0073] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0074] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0075] Figure 1 is a schematic diagram of the vehicle structure in some embodiments of this application;

[0076] Figure 2 is an exploded perspective view of the battery device in some embodiments of this application;

[0077] Figure 3 is a perspective view of a single battery cell in some embodiments of this application;

[0078] Figure 4 is an exploded perspective view of a battery cell in some embodiments of this application;

[0079] Figure 5 is a schematic diagram of the first wall, the first insulating element, the electrode terminal, the pressure relief mechanism, and the electrode sheet in some embodiments of this application;

[0080] Figure 6 is a schematic diagram of the structure of the first insulating element and the first wall in some embodiments of this application;

[0081] Figure 7 is a schematic diagram of the first insulating member and the first wall in some other embodiments of this application;

[0082] Figure 8 is a schematic diagram of the first insulating element in some embodiments of this application;

[0083] Figure 9 is a schematic diagram of the first boss in some embodiments of this application;

[0084] Figure 10 is an enlarged view of point A in Figure 6;

[0085] Figure 11 is a schematic diagram of the first insulating element in some embodiments of this application;

[0086] Figure 12 is a schematic diagram of the first wall, the first insulating member, and the blocking member in some embodiments of this application;

[0087] Figure 13 is a schematic diagram of the first insulating element in some embodiments of this application;

[0088] Figure 14 is a partial structural schematic diagram of the first insulating element in some embodiments of this application;

[0089] Figure 15 is a schematic diagram of a single battery cell in some embodiments of this application.

[0090] Icons: 1000 - Vehicle; 100 - Battery Unit; 200 - Controller; 300 - Motor; 10 - Battery Cell; 20 - Housing; 21 - First Housing Body; 22 - Second Housing Body; 11 - Outer Shell; 110 - Housing; 111 - First Wall; 1110 - Liquid Injection Hole; 12 - Electrode Assembly; 120 - Electrode Sheet; 1200 - Flat Area; 121 - Tab; 122 - Adapter; 13 - First Insulator; 130 - Insulator Body; 1300 - First Through Hole; 1301 - Terminal Through Hole; 131 - First Boss; 1310 - First Receiving Groove; 1311 - First Wall; 1312 - Second wall portion; 1313- Third wall portion; 1314- First protrusion; 132- Second boss; 1320- Second receiving groove; 133- Third boss; 1330- First surface; 13300- Second through hole; 1331- Second surface; 13310- Third through hole; 134- First groove; 135- Second groove; 14- Electrode terminal; 140- Pressure ring; 15- Second insulating component; 16- Pressure relief mechanism; 17- Sealing component; 18- Blocking component; 180- Liquid outlet; 181- Bottom wall; 182- Side wall; z- Thickness direction of the first wall; y- First direction; x- Second direction. Detailed Implementation

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] In this application, "multiple" means two or more (including two).

[0098] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0099] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0100] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, helps prevent short circuits to some extent while allowing active ions to pass through.

[0101] In some embodiments, the positive electrode may be a positive electrode sheet, which 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.

[0102] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0103] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors 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, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0104] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, at least one of lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (also abbreviated as NCM523), LiNi0.5Co0.25Mn0.25O2 (also abbreviated as NCM1), LiNi0.6Co0.2Mn0.2O2 (also abbreviated as NCM6), LiNi0.8Co0.1Mn0.1O2 (also abbreviated as NCM811), lithium nickel cobalt aluminum oxides (such as LiNi0.85Co0.15Al0.05O2) and their modified compounds.

[0105] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0106] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0107] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors 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, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0108] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0109] As an example, the negative electrode current collector has two surfaces opposite 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.

[0110] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may 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. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0111] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0112] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0113] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0114] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0115] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0116] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0117] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0118] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0119] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0120] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0121] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0122] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0123] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0124] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0125] In some implementations, the electrode assembly has a stacked structure.

[0126] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0127] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0128] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0129] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0130] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0131] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0132] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0133] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0134] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0135] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0136] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0137] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0138] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0139] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0140] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure body may be a top cover or a bottom plate.

[0141] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0142] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0143] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. The energy storage device includes energy storage containers, energy storage cabinets, etc. In some embodiments, one or more energy storage devices may constitute at least part of an energy storage system.

[0144] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long lifespan, wide applicability, and low self-discharge coefficient, making them a crucial component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, it's essential to consider how to improve the manufacturing efficiency of battery devices. In related technologies, the manufacturing process of a single battery cell includes the injection of electrolyte (e.g., electrolyte solution, hereinafter referred to as electrolyte solution), and the efficiency of electrolyte injection directly impacts the manufacturing efficiency of the battery device.

[0145] For a typical battery cell, the battery cell includes a casing, an electrode assembly, and a first insulating member. The first insulating member can be made of plastic. The first insulating member is disposed inside the casing and located between the casing wall and the electrode assembly to insulate and isolate the casing wall and the electrode assembly.

[0146] Generally, an injection hole is provided on the wall of the outer casing, and a through hole corresponding to the injection hole is provided on the first insulating member. The injection hole is used for injecting electrolyte. The electrolyte injected through the injection hole enters the battery cell and the electrode assembly through the corresponding through hole on the first insulating member.

[0147] In related technologies, to reduce the risk of internal circuitry disruption caused by electrode assembly movement, and to connect the Mylar membrane (an insulating structure covering the outer periphery of the electrode assembly, which insulates and protects the electrode assembly from the outer casing), a protrusion is formed on the side of the first insulating member facing the electrode assembly. This protrusion supports the electrode assembly to limit its movement and allows connection to the Mylar membrane. However, the protrusion occupies space between the first insulating member and the electrode assembly, hindering electrolyte injection and flow, resulting in low electrolyte injection efficiency and consequently affecting the manufacturing efficiency of the battery device.

[0148] Based on the above considerations, in order to improve the problem of low manufacturing efficiency of battery devices caused by the impact of protrusions on electrolyte injection efficiency, some embodiments of this application provide a battery cell, which includes a housing, an electrode assembly, and a first insulating member. The housing has a first wall with an injection hole. The electrode assembly is disposed within the housing. The first insulating member is disposed within the housing and located between the first wall and the electrode assembly. The first insulating member includes an insulating body and a first protrusion. The first protrusion is formed on the side of the insulating body facing the electrode assembly and located at one end of the insulating body in a first direction. The insulating body has a first through hole corresponding to the position of the injection hole. The first direction y is perpendicular to the thickness direction z of the first wall. Along the first direction, a first receiving groove is formed on the side of the first protrusion near the first through hole.

[0149] In the above scheme, the electrolyte enters the battery cell through the first through hole of the injection aperture. By forming a first receiving groove on the side of the first protrusion near the first through hole, additional space can be provided for the electrolyte to enter the battery cell, thereby allowing more electrolyte to be injected in a certain period of time. This improves the electrolyte injection efficiency, resulting in higher manufacturing efficiency of the battery cell and thus improving the manufacturing efficiency of the battery device.

[0150] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using battery cells and battery devices disclosed in this application. This helps to mitigate the problem of short circuits in battery cells during use, thereby improving the reliability of the battery cells.

[0151] This application provides an electrical device that uses a single battery cell or battery assembly 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.

[0152] 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.

[0153] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the vehicle's operating power source or general power source. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0154] In some embodiments of this application, the battery device 100 can not only serve as the operating power or 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.

[0155] Please refer to Figure 2, which is an exploded perspective view of the battery device 100 in some embodiments of this application. The battery device 100 includes a housing 20 and battery cells 10, the battery cells 10 being housed within the housing 20.

[0156] The housing 20 provides assembly space for the battery cell 10, and can adopt various structures. In some embodiments, the housing 20 may include a first housing body 21 and a second housing body 22, which overlap each other, and together define an assembly space for accommodating the battery cell 10. The second housing body 22 may be a hollow structure open at one end, and the first housing body 21 may be a plate-like structure, with the first housing body 21 covering the open side of the second housing body 22 so that the first housing body 21 and the second housing body 22 together define the assembly space; alternatively, the first housing body 21 and the second housing body 22 may both be hollow structures open on one side, with the open side of the first housing body 21 covering the open side of the second housing body 22.

[0157] Of course, the box 20 formed by the first box body 21 and the second box body 22 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in Figure 2, the shape of the box 20 is a cuboid.

[0158] In the battery device 100, there can be one or more battery cells 10 disposed within the housing 20. When there are multiple battery cells 10 disposed within the housing 20, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 10 is housed within the housing 20. Alternatively, the battery device 100 can also be composed of multiple battery cells 10 first connected in series, in parallel, or in a mixed configuration to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 20.

[0159] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 10 to achieve electrical connection between the multiple battery cells 10.

[0160] For example, the housing 20 is provided with a plurality of battery cell assemblies, each battery cell assembly including a plurality of battery cells 10 stacked on top of each other, and the plurality of battery cells 10 are connected in series with each other through a busbar. In some embodiments, the plurality of battery cell assemblies can be connected in series with each other through a busbar.

[0161] Each battery cell can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 10 can be in the form of a cuboid, a cylinder, a prism, or other shapes. For example, in Figure 3, the battery cell 10 has a cuboid structure.

[0162] This application provides a battery cell 10 in some embodiments. Please refer to Figures 3-6. Figure 3 is a perspective view of the battery cell 10 in some embodiments of this application. Figure 4 is an exploded perspective view of the battery cell 10 in some embodiments of this application. Figure 5 is a schematic diagram of the first wall 111, the first insulating member 13, the electrode terminal 14, the pressure relief mechanism 16, and the electrode sheet 120 in some embodiments of this application. Figure 6 is a structural schematic diagram of the first insulating member 13 and the first wall 111 in some embodiments of this application.

[0163] The battery cell 10 includes a housing 11, an electrode assembly 12, and a first insulating member 13. The housing 11 has a first wall 111, and the first wall 111 is provided with a liquid injection hole 1110. The electrode assembly 12 is disposed inside the housing 11. The first insulating member 13 is disposed inside the housing 11 and located between the first wall 111 and the electrode assembly 12. The first insulating member 13 includes an insulating body 130 and a first boss 131. The first boss 131 is formed on the side of the insulating body 130 facing the electrode assembly 12 and located at one end of the insulating body 130 in a first direction y. The insulating body 130 is provided with a first through hole 1300 corresponding to the position of the liquid injection hole 1110. The first direction y is perpendicular to the thickness direction z of the first wall. Wherein, along the first direction y, a first receiving groove 1310 is formed on the side of the first boss 131 near the first through hole 1300.

[0164] In some embodiments, the outer casing 11 can be used to contain an electrolyte, such as an electrolyte solution. The outer casing 11 can have various structural forms, such as a square shell structure, a cylindrical shell structure, or a bag-like structure. The outer casing 11 can also be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0165] In some embodiments, the housing 11 can be a sealed structure or a non-sealed structure. As an example, when the housing 11 is a sealed structure, it can protect the electrode assembly 12 and prevent, to some extent, electrolyte leakage. When the housing 11 is a non-sealed structure, it can still protect the electrode assembly 12, and a sealing bag may be included between the housing 11 and the electrode assembly 12. The sealing bag is used to encapsulate the electrode assembly 12 and the electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film.

[0166] In some embodiments, referring to Figures 3 and 4, the housing 11 may include a housing 110 and an end cap. The housing 110 has an internal cavity with an opening, meaning the housing 110 is a hollow structure with one end open. The end cap closes to the opening of the housing 110 to form a sealed connection, thereby creating a sealed space for accommodating the electrode assembly 12 and the electrolyte (e.g., electrolyte solution). In some embodiments, the connection between the end cap and the housing 110 is varied, including but not limited to bonding, welding, riveting, or threaded connections.

[0167] Optionally, the housing 11 may include a housing 110 and two end caps. The two opposite ends of the housing 110 are open, that is, they have two opposite openings. One opening can be closed by one end cap, and the other opening can be closed by the other end cap.

[0168] Optionally, the first wall 111 may be an end cap, or at least a portion of an end cap, or one of a plurality of walls of the housing 110. Exemplarily, in Figures 3 and 4, the first wall 111 is an end cap of the housing 11, and the thickness direction z of the first wall may be the height direction of the battery cell 10. Of course, in other embodiments, the first wall 111 may also be a wall of the housing 110 disposed opposite to the end cap in the thickness direction z of the first wall, or a wall adjacent to and abutting against the end cap.

[0169] When assembling the battery cell 10, the electrode assembly 12 can be placed inside the housing 110, the end cap can be closed on the opening of the housing 110, and the electrolyte can be injected into the housing 11 through the injection hole 1110 on the first wall 111 of the housing 11.

[0170] The electrolyte injection hole 1110 is a through-hole structure provided on the first wall 111. It may include a stepped hole or a straight hole, and the electrolyte is injected into the battery cell 10 through the electrolyte injection hole 1110 in conjunction with the electrolyte injection equipment or operator. In some embodiments, after electrolyte injection, the electrolyte injection hole 1110 can be sealed by a sealing member 17. The sealing member 17 may include a plastic nail, an aluminum nail, or other structural components.

[0171] The housing 110 can have various shapes, such as a cylinder or a cuboid. The shape of the housing 110 can be determined according to the specific shape of the electrode assembly 12. For example, if the electrode assembly 12 is a cylindrical structure, then the housing 110 can be a cylindrical structure; if the electrode assembly 12 is a cuboid structure, then the housing 110 can be a cuboid structure. Of course, the end cap can also have various structures, such as a plate-like structure or a hollow structure with one end open. For example, in Figures 3 and 4, the housing 110 is a cuboid structure, and correspondingly, the end cap is a rectangular plate-like structure.

[0172] In some embodiments, the wall of the housing 11 may also be provided with a pressure relief mechanism 16, for example, the pressure relief mechanism 16 is provided on the first wall 111. The pressure relief mechanism 16 is used to release the pressure inside the battery cell 10 when the internal pressure or temperature of the battery cell 10 reaches a predetermined value.

[0173] Optionally, the pressure relief mechanism 16 and the housing 11 can be an integrally formed structure or a separate structure. If the pressure relief mechanism 16 and the housing 11 are separate structures, the pressure relief mechanism 16 can be connected to the housing 11 by welding or other means. For example, the housing 11 has a pressure relief hole, and the pressure relief mechanism 16 closes the pressure relief hole. Correspondingly, the pressure relief mechanism 16 can be a pressure relief component such as an explosion-proof valve, explosion-proof disc, gas valve, pressure relief valve, or safety valve. If the pressure relief mechanism 16 and the housing 11 are an integrally formed structure, the pressure relief mechanism 16 is a region on the housing 11 with a weak structure, such as a region on the housing 11 with a groove.

[0174] The electrode assembly 12 is a component in the battery cell 10 where an electrochemical reaction occurs. The electrode assembly 12 includes an electrode 120 and a separator (e.g., a separator membrane). The structure of the electrode assembly 12 can be various. For example, the electrode assembly 12 can be a wound structure formed by winding a positive electrode, a separator, and a negative electrode, or a stacked structure formed by arranging a positive electrode, a separator, and a negative electrode in layers.

[0175] Referring to Figure 5, a portion of the flat region 1200 of the electrode 120 is shown in Figure 5. The electrode 120 has a flat region 1200, and the flat regions 1200 of the positive electrode and the flat regions 1200 of the negative electrode are stacked on top of each other. In some embodiments, the direction in which the internal expansion of the battery cell 10 has the greatest impact is parallel to the stacking direction of the flat regions 1200. The separator can be a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0176] One end of the electrode assembly 12 has a tab 121, which is used to input or output the positive or negative electrode of the electrode assembly 12. The tab 121 is used to connect with the electrode terminal 14 to realize the electrical connection between the electrode assembly 12 and the electrode terminal 14. It should be noted that the tab 121 of the electrode assembly 12 is a component formed by stacking and connecting the regions of the positive electrode sheet that are not coated with a positive active material layer, or a component formed by stacking and connecting the regions of the negative electrode sheet that are not coated with a negative active material layer. If the tab 121 is used to output the positive electrode of the electrode assembly 12, then the tab 121 is a component formed by stacking and connecting the regions of the positive electrode sheet that are not coated with a positive active material layer; if the tab 121 is used to output the negative electrode of the electrode assembly 12, then the tab 121 is a component formed by stacking and connecting the regions of the negative electrode sheet that are not coated with a negative active material layer.

[0177] Optionally, the electrode assembly 12 housed within the housing 11 can be one or more. For example, in FIG4, the housing 11 of the battery cell 10 is provided with two electrode assemblies 12, which are stacked along their thickness direction. That is, the two electrode assemblies 12 are stacked along the thickness direction of the battery cell 10. Of course, in other embodiments, the electrode assembly 12 housed within the housing 11 can be one, three, four, five, six, seven, or eight, etc.

[0178] In some embodiments, the outer periphery of the electrode assembly 12 may be covered with a second insulating member 15, which may be a Mylar film.

[0179] The battery cell 10 also includes an electrode terminal 14, which serves to output or input electrical energy into the battery cell 10. One end of the electrode terminal 14 is used to connect to the tab 121 of the electrode assembly 12, and the other end is used to connect to the busbar component to realize the input or output of electrical energy into the battery cell 10.

[0180] For example, the electrode terminal 14 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. Of course, in some embodiments, the electrode terminal 14 can also be a composite material, that is, the electrode terminal 14 is formed by connecting two different metal materials, such as by hot pressing or cold pressing.

[0181] The electrode terminal 14 can be disposed on the first wall 111 or on other walls of the housing 11.

[0182] Taking the electrode terminal 14 disposed on the first wall 111 as an example, the first wall 111 is provided with a terminal hole, which extends through both sides of the first wall 111 along the thickness direction z. The electrode terminal 14 is inserted into the terminal hole along the thickness direction z of the first wall, so that part of the electrode terminal 14 is located in the terminal hole, so that the electrode terminal 14 can be connected to the electrode assembly 12 located inside the housing 11, and can also be connected to the current-collecting component located outside the housing 11, so as to realize the input or output of electrical energy of the battery cell 10.

[0183] The assembly relationship between the electrode terminal 14 and the first wall 111 is varied. For example, the electrode terminal 14 can be riveted to the first wall 111. For instance, the electrode terminal 14 may consist of two riveted parts that clamp the first wall 111. Alternatively, the electrode terminal 14 and the first wall 111 can be connected by other structural components. For example, the electrode terminal 14 may pass through a terminal hole, and the other structural component may be a pressure ring 140. The pressure ring 140 is welded to the first wall 111, and the pressure ring 140 and the first wall 111 together clamp a portion of the electrode terminal 14 in the thickness direction z of the first wall, thereby assembling the electrode terminal 14.

[0184] Optionally, the electrode terminal 14 can be directly connected to the tab 121 of the electrode assembly 12, such as by welding or abutting, or it can be indirectly connected to the tab 121 of the electrode assembly 12 through other components. Similarly, the connection structure between the electrode terminal 14 and the bus component can also be various, such as welding, abutting, or snap-fitting.

[0185] In some embodiments, as shown in FIG4, the battery cell 10 may further include an adapter 122 disposed within the housing 11. The adapter 122 connects the electrode terminal 14 and the tab 121 of the electrode assembly 12 to realize the electrical connection between the electrode assembly 12 and the electrode terminal 14.

[0186] The first insulating member 13 is an insulating structure disposed inside the housing 11 and located between the first wall 111 and the electrode assembly 12. The first insulating member 13 can be used to insulate and isolate the first wall 111 and the electrode assembly 12, and can also restrict the electrode assembly 12 from moving along the thickness direction z of the first wall. In some embodiments, the first insulating member 13 can be the lower plastic of the battery cell 10. Optionally, the material of the first insulating member 13 can be various, such as rubber, silicone, or plastic. Optionally, the electrode terminal 14 is disposed on the first wall 111, and the first insulating member 13 is provided with a terminal through-hole 1301 through which the power supply terminal 14 passes.

[0187] The first insulating element 13 includes an insulating body 130, which is the main structure of the first insulating element 13. Optionally, the insulating body 130 is generally plate-shaped. Along the thickness direction z of the first wall, the side of the insulating body 130 opposite to the electrode assembly 12 can be connected to the first wall 111. The connection relationship between the two is diverse, including but not limited to bonding, welding, snap-fitting, threaded connection or other connection methods.

[0188] The insulating body 130 may be provided with a terminal through-hole 1301 through which the power supply terminal 14 passes. The insulating body 130 may be provided with a first through-hole 1300 corresponding to the liquid injection hole 1110. The first through-hole 1300 may be a round hole, a square hole, or a hole of other shapes. Optionally, the first through-hole 1300 and the liquid injection hole 1110 are coaxially arranged. Optionally, the axis of the first through-hole 1300 and the axis of the liquid injection hole 1110 may not coincide or may intersect.

[0189] The correspondence between the first through hole 1300 and the injection hole 1110 can be understood as follows: the electrolyte injected through the injection hole 1110 will flow through the first through hole 1300 into the side of the first insulating member 13 facing the electrode assembly 12. For example, along the thickness direction z of the first wall, the orthographic projection of the injection hole 1110 at least partially coincides with the orthographic projection of the first through hole 1300, or the orthographic projection of the first through hole 1300 is covered by the orthographic projection of the injection hole 1110.

[0190] The first insulating member 13 further includes a first protrusion 131, which is disposed on the side of the insulating body 130 facing the electrode assembly 12 and located at one end of the insulating body 130 along the first direction y. That is, the first protrusion 131 is disposed on the inner side of the insulating body 130 and located at the end of the first direction y. The first protrusion 131 and the insulating body 130 can be integrally formed or separately disposed. When the first protrusion 131 and the insulating body 130 are separately disposed, their connection relationship includes, but is not limited to, bonding, welding, snap-fitting, or other connection methods. Optionally, the first direction y can be the length direction of the first wall 111. Optionally, the first direction y can be the width direction of the first wall 111.

[0191] In some embodiments, the first wall 111 is provided with two electrode terminals 14 of opposite polarity, and the two electrode terminals 14 may be spaced apart along the first direction y.

[0192] In some embodiments, the stacking direction of the flat region 1200 of the electrode 120 is taken as the second direction x, and the first direction y, the second direction x and the thickness direction z of the first wall are mutually perpendicular.

[0193] Optionally, along the first direction y, the location of the first through hole 1300 is located on one side of the first boss 131.

[0194] The phrase “A first receiving groove 1310 is formed on the side of the first boss 131 near the first through hole 1300 along the first direction y” can be understood as follows: the first boss 131 has a first receiving groove 1310 formed on the surface of the first boss 131 facing the first through hole 1300 along the first direction y, and the first receiving groove 1310 can contain the electrolyte flowing out of the first through hole 1300.

[0195] In the above scheme, the electrolyte enters the battery cell 10 through the injection hole 1110 and the first through hole 1300. By forming a first receiving groove 1310 on the side of the first boss 131 near the first through hole 1300, additional space can be provided for the electrolyte entering the battery cell 10, thereby allowing more electrolyte to be injected in a certain period of time, which improves the electrolyte injection efficiency and makes the battery cell 10 have higher manufacturing efficiency, which in turn helps to improve the manufacturing efficiency of the battery device 100.

[0196] According to some embodiments of this application, the first receiving groove 1310 does not penetrate the first boss 131 along the first direction y.

[0197] Please refer to Figure 6. In some embodiments, the blind hole structure of the first receiving groove 1310 is such that one end of the first receiving groove 1310 along the first direction y is the first slot of the first receiving groove 1310, and the first slot is set towards the position where the first through hole 1300 is located. The other end of the first receiving groove 1310 along the first direction y does not penetrate the first boss 131 and is in a closed state.

[0198] Optionally, along the second direction x, the first receiving groove 1310 does not penetrate both sides of the first boss 131.

[0199] Optionally, along the second direction x, the first receiving groove 1310 extends through at least one side of the first boss 131.

[0200] In the above scheme, the first receiving groove 1310 is a blind hole structure. The end of the first receiving groove 1310 away from the first through hole 1300 does not penetrate the first boss 131. This can reduce the loss of structural strength of the first insulating member 13 due to the setting of the groove structure to a certain extent, which is beneficial to the structural reliability of the first insulating member 13, and thus beneficial to the improvement of the reliability of the battery cell 10.

[0201] According to some embodiments of this application, the first receiving groove 1310 is open along the thickness direction z of the first wall towards the side facing the electrode assembly 12.

[0202] Referring to Figure 6, in some embodiments, along the thickness direction z of the first wall, the first receiving groove 1310 penetrates the surface of the first boss 131 facing the electrode assembly 12, such that the first receiving groove 1310 is open on the side facing the electrode assembly 12. It can be understood that the first receiving groove 1310 also has a second slot, which is disposed facing the electrode assembly 12.

[0203] Optionally, the size of the opening of the first receiving groove 1310 towards the electrode assembly 12 can be equal to or smaller than the size of the first receiving groove 1310. For example, the size of the portion of the first receiving groove 1310 opening towards the electrode assembly 12 along the second direction x is smaller than the size of the first receiving groove 1310 along the second direction x. For example, the size of the portion of the first receiving groove 1310 opening towards the electrode assembly 12 along the first direction y is smaller than the size of the first receiving groove 1310 along the first direction y.

[0204] Optionally, a through hole can also be formed on the side of the first boss 131 facing the electrode assembly 12, and the through hole connects to the first receiving groove 1310.

[0205] In the above scheme, by setting the side of the first receiving tank 1310 facing the electrode assembly 12 to be open, it is possible for the electrolyte to enter the electrode assembly 12, which makes the electrolyte injection efficiency high and is conducive to improving the manufacturing efficiency of the battery cell 10.

[0206] In other embodiments, please refer to FIG7, which is a schematic diagram of the first insulating member 13 and the first wall 111 in other embodiments of this application. Along the thickness direction z of the first wall, the side of the first receiving groove 1310 facing the electrode assembly 12 can be closed, as shown in FIG7. In this embodiment, the first receiving groove 1310 only includes the first slot, which is located on the side of the first boss 131 facing the location of the first through hole 1300.

[0207] According to some embodiments of this application, please refer to Figures 5 and 6. The first insulating member 13 further includes a second boss 132. The second boss 132 is formed on the side of the insulating body 130 facing the electrode assembly 12, and the second boss 132 is located at the other end of the insulating body 130 in the first direction y. Along the first direction y, a second receiving groove 1320 is provided on the side of the second boss 132 facing the first through hole 1300.

[0208] The second protrusion 132 is disposed on the side of the insulating body 130 facing the electrode assembly 12, and the second protrusion 132 is disposed on the same side as the first protrusion 131. Optionally, the second protrusion 132 can be square, circular or other shapes.

[0209] Along the first direction y, the first boss 131 and the second boss 132 are located at opposite ends of the insulating body 130, and the first through hole 1300 is located between the first boss 131 and the second boss 132.

[0210] Optionally, the second boss 132 can be used to contact the electrode assembly 12 to limit the movement of the electrode assembly 12.

[0211] Optionally, there may be a gap between the side of the second boss 132 facing the electrode assembly 12 and the electrode assembly 12.

[0212] Optionally, the second boss 132 can be used to connect with the second insulator 15.

[0213] The phrase “A second receiving groove 1320 is provided on the side of the second boss 132 facing the first through hole 1300 along the first direction y” can be understood as follows: the second receiving groove 1320 is provided on the side of the second boss 132 facing the first through hole 1300, and the second receiving groove 1320 can accommodate the electrolyte flowing out of the first through hole 1300.

[0214] Optionally, the second receiving groove 1320 can be a blind hole structure that does not penetrate the second boss 132.

[0215] Optionally, the second receiving groove 1320 is open along the thickness direction z of the first wall towards the side facing the electrode assembly 12.

[0216] In the above solution, by providing a second protrusion 132 at the other end of the first insulating member 13 along the first direction y, and providing a second receiving groove 1320 on the side of the second protrusion 132 facing the first through hole 1300, it can restrict the movement of the electrode assembly 12 on the one hand, and provide more space for the electrolyte on the other hand, thereby improving the electrolyte injection efficiency and thus improving the manufacturing efficiency of the battery cell 10.

[0217] According to some embodiments of this application, along the first direction y, the first boss 131 is closer to the first through hole 1300 than the second boss 132, the width of the first receiving groove 1310 along the second direction x is greater than the width of the second receiving groove 1320 along the second direction x, and the first direction y, the second direction x and the thickness direction z of the first wall are perpendicular to each other.

[0218] In some embodiments, the injection hole 1110 is eccentrically disposed on the first wall 111, and the corresponding first through hole 1300 is eccentrically disposed on the insulating body 130. Along the first direction y, the first through hole 1300 is closer to the first boss 131.

[0219] The width of the first receiving groove 1310 along the second direction x can be understood as the total width of all the first receiving grooves 1310 along the second direction x. For example, when there are two first receiving grooves 1310, the "width of the first receiving groove 1310 along the second direction x" can be the sum of the widths of the two first receiving grooves 1310. Similarly, the width of the second receiving groove 1320 along the second direction x can be understood as the total width of all the second receiving grooves 1320 along the second direction x.

[0220] The phrase “the width of the first receiving tank 1310 along the second direction x is greater than the width of the second receiving tank 1320 along the second direction x” can be understood as the first receiving tank 1310 of the first boss 131 being able to hold more electrolyte than the second receiving tank 1320 of the second boss 132.

[0221] In the above scheme, the first receiving tank 1310 is closer to the electrolyte injection position than the second receiving tank 1320. To this end, by setting the width of the first receiving tank 1310 along the second direction x to be larger, it can more timely receive the electrolyte injected through the first through hole 1300, thereby allowing more electrolyte to be injected within a certain period of time, which is conducive to improving the electrolyte injection efficiency and thus improving the manufacturing efficiency of the battery device 100.

[0222] According to some embodiments of this application, please refer to FIG8, which is a schematic diagram of the first insulating member 13 in some embodiments of this application.

[0223] The width of the first receiving groove 1310 along the second direction x is K2, and the width of the second receiving groove 1320 along the second direction x is K3, satisfying 0.05≤(K2-K3) / K2≤0.2.

[0224] The width of the first receiving groove 1310 along the second direction x can be the total width of all the first receiving grooves 1310 on the first boss 131.

[0225] Please refer to Figure 8. The width of the first receiving groove 1310 along the second direction x is K2. For example, in Figure 8, there are two first receiving grooves 1310. The width of each first receiving groove 1310 along the second direction x is marked as k2, where K2 is equal to k2 + k2. It should be noted that the width of each of the multiple first receiving grooves 1310 can be equal or unequal.

[0226] The width of the second receiving groove 1320 along the second direction x is K3. For example, in FIG8, there are two second receiving grooves 1320, and the width of each second receiving groove 1320 along the second direction x is marked as k3, where K3 is equal to k3+k3. It should be noted that the width of each of the multiple second receiving grooves 1320 can be equal or unequal.

[0227] Optionally, the width of the first receiving groove 1310 along the second direction x is greater than the width of the second receiving groove 1320 along the second direction x. The width of the first receiving groove 1310 is 5% to 20% larger than the width of the second receiving groove 1320, that is, 0.05 ≤ (K2-K3) / K2 ≤ 0.2. Optionally, the value of (K2-K3) / K2 can be 0.05, 0.06, 0.07, 0.08, 0.09, 0.1…0.18, 0.19, 0.2 or any value between two adjacent values.

[0228] In the above scheme, the width of the first receiving tank 1310 along the second direction x is greater than the width of the second receiving tank 1320 along the second direction x. This limits the width of the first receiving tank 1310 to be greater than the width of the second receiving tank 1320 by not less than 0.5% and not more than 20% of the width of the second receiving tank 1320. This can balance the fact that the first receiving tank 1310 can hold more electrolyte and the structural strength loss of the first insulating component 13 is small, thereby improving the manufacturing efficiency of the battery cell 10 and the reliability of the battery cell 10.

[0229] According to some embodiments of this application, please refer to Figures 6, 8, or 9. Figure 9 is a schematic diagram of the first boss 131 in some embodiments of this application. There are multiple first receiving grooves 1310, which are arranged at intervals along the second direction x. The first direction y, the second direction x, and the thickness direction z of the first wall are perpendicular to each other.

[0230] In some embodiments, the first boss 131 is provided with a plurality of first receiving grooves 1310, for example, two, three, four or more first receiving grooves 1310 are provided. In these embodiments, the plurality of first receiving grooves 1310 are arranged at intervals along the second direction x, and the opening of each receiving groove can be set toward the location of the first through hole 1300.

[0231] For example, referring to Figure 9, the first boss 131 is provided with two first receiving grooves 1310. Both first receiving grooves 1310 are blind hole structures, and both are open on the side facing the electrode assembly 12. The two first receiving grooves 1310 are spaced apart along the second direction x, dividing the first boss 131 into multiple interconnected components, such as a first wall portion 1311, a second wall portion 1312, a third wall portion 1313, and a first protrusion 1314. The first wall portion 1311 and the second wall portion 1312 are spaced apart along the second direction x. The end of the first wall portion 1311 away from the first through hole 1300 and the end of the second wall portion 1312 away from the first through hole 1300 are connected through the third wall portion 1313. Along the second direction x, the first protrusion 1314 is located between the first wall portion 1311 and the second wall portion 1312.

[0232] Optionally, the second boss 132 may also be provided with multiple second receiving slots 1320.

[0233] In the above scheme, by setting multiple first receiving tanks 1310 and arranging them at intervals along the second direction x, the electrolyte injected through the injection hole 1110 and the first through hole 1300 can be quickly contained, thereby meeting the requirement for faster electrolyte injection speed, improving injection efficiency, and thus improving the manufacturing efficiency of the battery cell 10.

[0234] According to some embodiments of this application, along the second direction x, the first boss 131 includes a first wall portion 1311, a second wall portion 1312, a third wall portion 1313, and a first protrusion 1314. The first wall portion 1311 and the second wall portion 1312 are spaced apart along the second direction x. One end of the first wall portion 1311 away from the first through hole 1300 and one end of the second wall portion 1312 away from the first through hole 1300 are connected through the third wall portion 1313. Along the second direction x, the first protrusion 1314 is located between the first wall portion 1311 and the second wall portion 1312. Along the second direction x, the first protrusion 1314 and the first wall portion 1311 are spaced apart and form a first receiving groove 1310. The first protrusion 1314 and the second wall portion 1312 are spaced apart and form a first receiving groove 1310.

[0235] Optionally, there are two first receiving grooves 1310, which are spaced apart along the second direction x. A first protrusion 1314 is located between the two first receiving grooves 1310. Along the second direction x, one of the first receiving grooves 1310 has a first wall portion 1311 on the side opposite to the first protrusion 1314, which can be connected to the edge of the insulating body 130. The other first receiving groove 1310 has a second wall portion 1312 on the side opposite to the first protrusion 1314, which can be connected to the edge of the insulating body 130. Along the second direction x, the edge of the insulating body 130 has a third wall portion 1313, which is connected to the first wall portion 1311 and the second wall portion 1312 at both ends along the first direction y.

[0236] Optionally, the dimensions of the first wall portion 1311, the second wall portion 1312, and the first protrusion 1314 along the second direction x can be the same or different. For example, the dimensions of the first wall portion 1311 and the second wall portion 1312 along the second direction x can be small, while the dimension of the first protrusion 1314 along the second direction x can be large. That is, the first wall portion 1311 and the second wall portion 1312 can be in the form of a sheet, while the first protrusion 1314 can be in the form of a block.

[0237] Optionally, the thickness of the third wall portion 1313 may be the same as or different from the thickness of the first wall portion 1311 and the second wall portion 1312. For example, the thicknesses of the first wall portion 1311, the second wall portion 1312 and the third wall portion 1313 may be the same and all less than the thickness of the first protrusion 1314 along the second direction x.

[0238] In the above scheme, the first boss 131 includes a first wall portion 1311, a second wall portion 1312, a third wall portion 1313, and a first protrusion 1314. A first receiving groove 1310 can be formed between the first wall portion 1311 and the first protrusion 1314, and another first receiving groove 1310 can be formed between the second wall portion 1312 and the first protrusion 1314. This can quickly receive electrolyte injected through the injection hole 1110 and the first through hole 1300, thereby meeting the requirement for faster electrolyte injection speed, improving injection efficiency, and thus improving the manufacturing efficiency of the battery cell 10.

[0239] According to some embodiments of this application, the battery cell 10 further includes a second insulating member 15, at least a portion of which covers the electrode assembly 12, and the second insulating member 15 is connected to at least one of the outer side surface of the first wall portion 1311, the outer side surface of the second wall portion 1312, and the outer side surface of the third wall portion 1313.

[0240] Referring to Figure 4, the second insulating member 15 surrounds the outer periphery of the electrode assembly 12, providing insulation and protection. In some embodiments, the second insulating member 15 can be an insulating film, such as a Mylar film.

[0241] Along the direction of the electrode assembly 12 toward the first wall 111, the second insulating member 15 may extend beyond the side of the electrode assembly 12 facing the first wall 111. The portion of the second insulating member 15 extending beyond the electrode assembly 12 may be connected to the first insulating member 13. The connection relationship between the second insulating member 15 and the first insulating member 13 is diverse, including but not limited to welding, bonding, hot-melt connection, hot-press connection, etc.

[0242] Optionally, the portion of the second insulating member 15 extending beyond the electrode assembly 12 may be connected to at least a portion of the outer surfaces of the first boss 131 and the second boss 132 of the first insulating member 13. For example, the second insulating member 15 may be connected to at least one of the outer surfaces of the first wall portion 1311, the second wall portion 1312, and the third wall portion 1313. Exemplarily, the second insulating member 15 may be thermally fused to the outer surfaces of the first wall portion 1311 and the second wall portion 1312.

[0243] In the above scheme, by setting the second insulating element 15 to wrap the electrode assembly 12, the electrode assembly 12 can be protected and insulated, which can ensure the reliability of the electrode assembly 12 to a certain extent, reduce the risk of short circuit between the electrode assembly 12 and the outer casing 11, make the battery cell 10 highly reliable, and thus make the battery device 100 highly reliable.

[0244] According to some embodiments of this application, a first protrusion 1314 protrudes from the first wall portion 1311, the second wall portion 1312 and the third wall portion 1313 in the direction of the first wall 111 pointing to the electrode assembly 12.

[0245] In some embodiments, along the direction of the first wall 111 toward the electrode assembly 12, the first protrusion 1314 protrudes from the first wall portion 1311, the second wall portion 1312 and the third wall portion 1313. That is, the first protrusion 1314 is closer to the electrode assembly 12 than the first wall portion 1311, the second wall portion 1312 and the third wall portion 1313. For example, the first protrusion 1314 can contact the electrode assembly 12, while the first wall portion 1311, the second wall portion 1312 and the third wall portion 1313 do not contact the electrode assembly 12.

[0246] Optionally, along the direction from the first wall 111 to the electrode assembly 12, the dimensions of the first wall portion 1311 protruding from the insulating body 130, the dimensions of the second wall portion 1312 protruding from the insulating body 130, and the dimensions of the third wall portion 1313 protruding from the insulating body 130 can be the same or different. For example, the dimensions of the first wall portion 1311 protruding from the insulating body 130, the dimensions of the second wall portion 1312 protruding from the insulating body 130, and the dimensions of the third wall portion 1313 protruding from the insulating body 130 can be the same, or the dimensions of the first wall portion 1311 protruding from the insulating body 130 can be greater than the dimensions of the second wall portion 1312 protruding from the insulating body 130, and the dimensions of the second wall portion 1312 protruding from the insulating body 130 can be greater than the dimensions of the third wall portion 1313 protruding from the insulating body 130.

[0247] In the above solution, by setting the first protrusion 1314 to protrude from the first wall portion 1311, the second wall portion 1312 and the third wall portion 1313, on the one hand, the first protrusion 1314 can be used to restrict the movement of the electrode assembly 12, so that the internal structure and internal circuit of the battery cell 10 are stable. On the other hand, the first wall portion 1311, the second wall portion 1312 and the third wall portion 1313 are far away from the electrode assembly 12, so that the risk of the first wall portion 1311, the second wall portion 1312 and the third wall portion 1313 being inserted into the electrode assembly 12 and causing damage to the electrode sheet 120 structure can be reduced, so that the battery cell 10 has high reliability.

[0248] According to some embodiments of this application, along the thickness direction z of the first wall, the side of the first wall portion 1311 facing the electrode assembly 12, the side of the second wall portion 1312 facing the electrode assembly 12, and the side of the third wall portion 1313 facing the electrode assembly 12 are flush with each other.

[0249] In some embodiments, the dimensions of the first wall portion 1311, the second wall portion 1312, and the third wall portion 1313 in the thickness direction z of the first wall may be the same, such that the first wall portion 1311, the second wall portion 1312, and the third wall portion 1313 are flush with each other on the side facing the electrode assembly 12.

[0250] In the above solution, by setting the side of the first wall portion 1311 facing the electrode assembly 12, the side of the second wall portion 1312 facing the electrode assembly 12, and the side of the third wall portion 1313 facing the electrode assembly 12 to be flush with each other, the structural consistency of the first boss 131 can be provided, the manufacturing difficulty of the first insulating member 13 can be reduced, and the manufacturing efficiency of the battery cell 10 can be improved.

[0251] According to some embodiments of this application, please refer to FIG9, in the direction from the first wall 111 to the electrode assembly 12, the first protrusion 1314 protrudes from the first wall 1311 by an amount not less than 0.2 mm and not more than 3 mm.

[0252] Along the direction from the first wall 111 toward the electrode assembly 12, the first protrusion 1314 protrudes beyond the first wall 1311 by a dimension D. The value of D can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm...2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm or any value between two adjacent values.

[0253] Optionally, the value of D can also be 1mm, 1.1mm, 1.2mm, 1.3mm...2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm or any value between two adjacent values.

[0254] In the above solution, by setting the size of the first protrusion 1314 protruding from the first wall portion 1311 to not less than 0.2 mm, the risk of damage to the electrode 120 caused by the insertion of the first wall portion 1311, the second wall portion 1312, and the third wall portion 1313 into the electrode assembly 12 can be effectively reduced; by setting the size of the first protrusion 1314 protruding from the first wall portion 1311 to not more than 3 mm, the space occupied by the first protrusion 1314 between the insulating body 130 and the electrode assembly 12 can be reduced, and the first wall portion 1311, the second wall portion 1312, and / or the third wall portion 1313 can have sufficient space to connect the second insulating member 15.

[0255] According to some embodiments of this application, please refer to FIG8, the width of the first insulating member 13 along the second direction x is K1, and the width of the first receiving groove 1310 along the second direction x is K2, satisfying 0.1≤K2 / K1≤0.6, and the first direction y, the second direction x and the thickness direction z of the first wall are mutually perpendicular.

[0256] The width of the first receiving groove 1310 along the second direction x can be the total width of all the first receiving grooves 1310 on the first boss 131.

[0257] Please refer to Figure 8. The width of the first receiving groove 1310 along the second direction x is K2. For example, in Figure 8, there are two first receiving grooves 1310. The width of each first receiving groove 1310 along the second direction x is marked as k2, where K2 is equal to k2 + k2. It should be noted that the width of each of the multiple first receiving grooves 1310 can be equal or unequal.

[0258] Please refer to Figure 8. The width of the first insulating member 13 in the second direction x is K2. The value of K2 / K1 can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 or any value between two adjacent values.

[0259] In the above scheme, the width of the first receiving groove 1310 along the second direction x is not less than 0.1 and not more than 0.6 of the size of the first insulating member 13 along the second direction x. On the one hand, this allows the first receiving groove 1310 to contain electrolyte, thereby improving the electrolyte injection efficiency. On the other hand, it can reduce the loss of structural strength of the first insulating member 13 caused by setting the first receiving groove 1310 to a certain extent, thereby taking into account both the manufacturing efficiency and reliability of the battery cell 10.

[0260] According to some embodiments of this application, please refer to Figures 5 and 10, where Figure 10 is an enlarged view of point A in Figure 6. The battery cell 10 also includes a pressure relief mechanism 16 disposed on the first wall 111. The electrode assembly 12 includes an electrode sheet 120, which has a flat region 1200. The flat region 1200 is stacked along a second direction x, and the first direction y, the second direction x, and the thickness direction z of the first wall are mutually perpendicular. The first insulating member 13 also includes a third boss 133, which has a first surface 1330 facing the electrode assembly 12. The first surface 1330 has a second through hole 13300, which penetrates the first insulating member 13 along the thickness direction z of the first wall. The length direction of the first through hole 1300 intersects the first direction y.

[0261] Please refer to Figure 5. The flat area 1200 of the electrode 120 is stacked along the second direction x.

[0262] The first insulating member 13 further includes a third protrusion 133, which is disposed on the side of the insulating body 130 facing the electrode assembly 12. The first protrusion 131, the second protrusion 132, and the third protrusion 133 are disposed on the same side. In some embodiments, along the first direction y, the third protrusion 133 may be located between the first protrusion 131 and the second protrusion 132. In some embodiments, the third protrusion 133 may also be disposed at one end of the insulating body 130 along the first direction y.

[0263] The third protrusion 133 and the insulating body 130 can be integrally formed or separately set. When the third protrusion 133 and the insulating body 130 are separately set, the connection between the two includes, but is not limited to, bonding, welding, snap-fitting or other connection methods.

[0264] The first surface 1330 is the surface of the third boss 133 facing the electrode assembly 12. In some embodiments, the first surface 1330 can be in direct contact with the electrode assembly 12. In other embodiments, there can be a gap between the first surface 1330 and the electrode assembly 12.

[0265] The second through hole 13300 is a through hole structure formed on the first surface 1330 and extending through the entire first insulating member 13 along the thickness direction z of the first wall. The second through hole 13300 can connect the interior of the battery cell 10 and the pressure relief mechanism 16, so that the gas inside the battery cell 10 can flow through the second through hole 13300 to the pressure relief mechanism 16 and be discharged by the pressure relief mechanism 16.

[0266] Optionally, the position of the second through hole 13300 can correspond to the position of the pressure relief mechanism 16. For example, the pressure relief mechanism 16 is located in the middle of the first wall 111, and the position of the second through hole 13300 is located in the middle of the first insulating member 13, with the two corresponding to each other. Optionally, the position of the second through hole 13300 can not correspond to the position of the pressure relief mechanism 16. For example, the pressure relief mechanism 16 is located in the middle of the first wall 111, and the position of the second through hole 13300 is located at the edge of the first insulating member 13, with the two being offset from each other.

[0267] In some embodiments, the second through hole 13300 can be strip-shaped, flat, or other shapes with a relatively long dimension in one direction. The length direction of the second through hole 13300 is the direction in which the size of the second through hole 13300 is maximum. For example, the second through hole 13300 is a strip-shaped hole, and the dimension of the second through hole 13300 in the length direction is the maximum dimension of the second through hole 13300.

[0268] The phrase "the length direction of the second through hole 13300 intersects the first direction y" can be understood as follows: the length direction of the second through hole 13300 intersects the extension direction or length direction of the portion of the electrode 120 located in the flat region 1200. Alternatively, it can be understood as follows: along the thickness direction z of the first wall, the projection of the second through hole 13300 and the projection of the flat region 1200 of the electrode 120 intersect each other; the length directions of the projections of the second through hole 13300 and the flat region 1200 of the electrode 120 are staggered and not parallel. Optionally, the length direction of the second through hole 13300 and the first direction y have an angle, for example, this angle can be 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100°, or other angles.

[0269] In the above scheme, by providing a second through hole 13300 on the third protrusion 133, on the one hand, it facilitates the gas inside the battery cell 10 to pass through the first insulating member 13 and be discharged by the pressure relief mechanism 16, thereby reducing the risk of thermal runaway of the battery cell 10; on the other hand, by setting the length direction of the second through hole 13300 to intersect with the length direction of the electrode 120 located in the flat region 1200, it can effectively reduce the risk of the electrode 120 being damaged due to insertion into the second through hole 13300, resulting in a short circuit inside the battery cell 10, thereby improving the reliability of the battery cell 10 and thus making the battery device 100 highly reliable.

[0270] According to some embodiments of this application, the length direction of the second through hole 13300 and the second direction x are parallel to each other.

[0271] The statement that "the length direction of the second through hole 13300 is parallel to the second direction x" can be understood as follows: the length direction of the second through hole 13300 is perpendicular to the extension direction or length direction of the portion of the electrode 120 located in the flat region 1200. Alternatively, it can be understood as follows: along the thickness direction z of the first wall, the length direction of the projection of the second through hole 13300 is perpendicular to the length direction of the projection of the flat region 1200 of the electrode 120.

[0272] Optionally, there may be multiple second through holes 13300, which are spaced apart. For example, the second through holes 13300 are arranged in a rectangular array. For instance, the length direction of the second through holes 13300 is parallel to the second direction x, and two spaced-apart second through holes 13300 in the second direction x form a column, with two columns of second through holes 13300 spaced apart along the first direction y.

[0273] In the above scheme, the second direction x is the stacking direction of the electrode 120 in the flat region 1200. This scheme is perpendicular to the length direction of the electrode 120 in the flat region 1200. In this regard, by making the length direction of the second through hole 13300 and the second direction x parallel to each other, the second through hole 13300 and the electrode 120 corresponding to the second through hole 13300 can be arranged perpendicularly and staggered, which effectively reduces the risk of structural damage caused by the electrode 120 being inserted into the second through hole 13300, resulting in a short circuit inside the battery cell 10. This can improve the reliability of the battery cell 10 and thus make the battery device 100 highly reliable.

[0274] According to some embodiments of this application, please refer to Figure 11, which is a schematic diagram of the first insulating member 13 in some embodiments of this application. The width of the second through hole 13300 is not less than 0.5 mm and not more than 5 mm.

[0275] The width direction of the second through hole 13300 is perpendicular to the length direction of the second through hole 13300, and the width of the second through hole 13300 is its dimension in the width direction. Referring to Figure 11, the width of the second through hole 13300 is W1, and the value of W1 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm...4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm or any value between two adjacent values.

[0276] Optionally, the width of the second through hole 13300 is W1, and the value of W1 can also be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm...3.3mm, 3.4mm, 3.5mm or any value between two adjacent values.

[0277] In the above scheme, by setting the width of the second through hole 13300 to not less than 0.5 mm, the gas inside the battery cell 10 can pass through the hole and be discharged by the pressure relief mechanism 16, which is beneficial to improving the reliability of the battery cell 10 and the battery device 100. By setting the width of the second through hole 13300 to not more than 5 mm, the risk of damage to the electrode 120 caused by the insertion of the electrode 120 into the second through hole 13300 can be reduced, and the impact on the structural strength of the first insulating member 13 caused by the excessive size of the second through hole 13300 can be reduced, which is beneficial to improving the structural stability of the internal structure of the battery cell 10, thereby improving the reliability of the battery device 100. Therefore, setting the width of the second through hole 13300 to not less than 0.5 mm and not more than 5 mm can balance the pressure relief capacity of the battery cell 10 and the stability of the internal structure of the battery cell 10, thereby improving the reliability of the battery device 100.

[0278] According to some embodiments of this application, along the thickness direction z of the first wall, the projection of the pressure relief mechanism 16 on the first insulating member 13 at least partially covers the second through hole 13300.

[0279] In some embodiments, the location of the second through hole 13300 corresponds to the location of the pressure relief mechanism 16, that is, gas passing through the second through hole 13300 can act on the pressure relief mechanism 16 along the thickness direction z of the first wall and can be discharged by the pressure relief mechanism 16. Exemplarily, along the first direction y, the pressure relief mechanism 16 is disposed in the middle of the first wall 111, and the third boss 133 is disposed in the middle of the first insulating member 13, corresponding to the location of the pressure relief mechanism 16. Exemplarily, along the first direction y, the pressure relief mechanism 16 is disposed at the end of the first wall 111, and the third boss 133 is disposed at the end of the first insulating member 13, corresponding to the location of the pressure relief mechanism 16.

[0280] In the above scheme, the position of the second through hole 13300 corresponds to the position of the pressure relief mechanism 16, which enables the internal gas of the battery cell 10 to quickly pass through the second through hole 13300 and be discharged to the outside through the pressure relief mechanism 16, resulting in high pressure relief efficiency of the battery cell 10, thereby improving the reliability of the cell and thus improving the reliability of the battery device 100.

[0281] According to some embodiments of this application, please refer to FIG5, a first groove 134 corresponding to the position of the third boss 133 is formed on the side of the first insulating member 13 facing the first wall 111, and a second through hole 13300 is disposed on the bottom wall of the first groove 134.

[0282] The inner side of the first insulating member 13 is disposed toward the electrode assembly 12, and the outer side of the first insulating member 13 is disposed toward the first wall 111. In some embodiments, the outer side of the first insulating member 13 is recessed to form a first groove 134, and the inner side of the first insulating member 13 protrudes at a position corresponding to the first groove 134 to form a third boss 133, and a second through hole 13300 is formed in the bottom wall of the first groove 134.

[0283] In some embodiments, the surface of the pressure relief mechanism 16 facing the electrode assembly 12 is spaced apart from the bottom wall of the first groove 134.

[0284] In the above solution, by providing a first groove 134 on the side of the first insulating member 13 away from the electrode assembly 12, and the position of the first groove 134 corresponding to the position of the third protrusion 133, on the one hand, the pressure relief mechanism 16 can be avoided, reducing the interference of the pressure relief mechanism 16 on the second through hole 13300. On the other hand, a cavity can be formed between the pressure relief mechanism 16 and the third protrusion 133 to accommodate the gas passing through the second through hole 13300, thereby facilitating the pressure relief mechanism 16 to discharge the gas inside the battery cell 10, and thus improving the reliability of the battery device 100.

[0285] In some other embodiments of this application, the portion of the first insulating member 13 that is away from the electrode assembly 12 and corresponds to the third protrusion 133 can be a flat surface. That is, relative to the above embodiments, the side of the first insulating member 13 that is away from the electrode assembly 12 does not have a first groove 134.

[0286] According to some embodiments of this application, please refer to FIG10, the first insulating member 13 has a second surface 1331 facing the electrode assembly 12, pointing towards the electrode assembly 12 along the first wall 111, the first surface 1330 protruding from the second surface 1331, the second surface 1331 being provided with a third through hole 13310, along the thickness direction z of the first wall, the projection of the pressure relief mechanism 16 on the first insulating member 13 at least partially covers the third through hole 13310.

[0287] Along the thickness direction z of the first wall, the first surface 1330 and the second surface 1331 are located on the same side of the first insulating member 13 facing the electrode assembly 12, and the second surface 1331 is farther away from the electrode assembly 12 relative to the first surface 1330. Optionally, in some embodiments, the first surface 1330 is in contact with the electrode assembly 12, while the second surface 1331 is not in contact with the electrode assembly 12. Optionally, in some embodiments, the first surface 1330 is not in contact with the electrode assembly 12, but there is a gap between them, and the second surface 1331 is not in contact with the electrode assembly 12 at all, and the distance between the second surface 1331 and the electrode assembly 12 is greater than the distance between the first surface 1330 and the electrode assembly 12.

[0288] Optionally, the second surface 1331 can be the inner surface of the insulating body 130. Optionally, the second surface 1331 can protrude from the inner surface of the insulating body 130.

[0289] The third through hole 13310 is a through hole structure formed on the second surface 1331 and penetrating the first insulating member 13. The third through hole 13310 allows gas inside the battery cell 10 to pass through so that it can be discharged by the pressure relief mechanism 16.

[0290] The shape of the third through hole 13310 can be varied, including but not limited to circular, strip-shaped or other shapes.

[0291] The statement that "the projection of the pressure relief mechanism 16 on the first insulating member 13 at least partially covers the third through hole 13310" can be understood as meaning that, along the thickness direction z of the first wall, the position of the third through hole 13310 is directly opposite the position of the pressure relief mechanism 16. Exemplarily, in some embodiments, along the thickness direction z of the first wall, the projection of the pressure relief mechanism 16 onto the first insulating member 13 can cover both the second through hole 13300 and the third through hole 13310, or the projection of the first insulating member 13 can cover a portion of the second through hole 13300 and a portion of the third through hole 13310.

[0292] In the above scheme, by setting the third through hole 13310, the path of gas inside the battery cell 10 through the first insulating member 13 and discharged by the pressure relief mechanism 16 can be increased, thereby improving the pressure relief efficiency of the battery cell 10, making the battery cell 10 more reliable, and thus making the battery device 100 more reliable.

[0293] According to some embodiments of this application, the length direction of the third through hole 13310 intersects the length direction of the second through hole 13300.

[0294] In some embodiments, the third through hole 13310 has a length direction, and its dimension in the length direction is larger than its dimension in other directions. Optionally, the third through hole 13310 is an elongated hole.

[0295] The phrase "the length direction of the third through hole 13310 intersects the length direction of the second through hole 13300" can be understood as meaning that the length direction of the third through hole 13310 and the length direction of the second through hole 13300 are not parallel, for example, there is an angle between them, such as 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100° or other angles.

[0296] In the above scheme, the second surface 1331 is far away from the electrode assembly 12 relative to the first surface 1330. Therefore, the second surface 1331 does not contact the electrode assembly 12 relative to the first surface 1330, thus reducing the risk of the electrode 120 being inserted into the second surface 1331. By setting the length direction of the third through hole 13310 to intersect with the length direction of the second through hole 13300, the structural strength of the first insulating member 13 can be improved, and the risk of the first insulating member 13 being deformed by internal pressure and interfering with other structural components of the battery cell 10 can be reduced.

[0297] According to some embodiments of this application, referring to FIG10, the length direction of the second through hole 13300 is parallel to the second direction x, and the length direction of the third through hole 13310 is parallel to the first direction y.

[0298] In some embodiments, the length direction of the second through hole 13300 and the length direction of the third through hole 13310 are perpendicular to each other, so that the second through hole 13300 and the third through hole 13310 are formed perpendicularly and intersectingly on the first insulating member 13.

[0299] In the above scheme, on the one hand, by making the length direction of the second through hole 13300 parallel to the second direction x, the second through hole 13300 and the corresponding electrode 120 can be arranged perpendicularly and staggered, which effectively reduces the risk of structural damage caused by the electrode 120 being inserted into the second through hole 13300, resulting in a short circuit inside the battery cell 10, thereby improving the reliability of the battery cell 10 and thus making the battery device 100 highly reliable. On the other hand, by setting the length direction of the third through hole 13310 to be parallel to the first direction y, that is, perpendicular to the length direction of the second through hole 13300, two kinds of through holes are formed in a cross pattern on the first insulating member 13, which can improve the overall strength of the first insulating member 13, making the internal structure of the battery cell 10 stable and conducive to improving the reliability of the battery device 100.

[0300] According to some embodiments of this application, a second groove 135 is formed on the side of the first insulating member 13 facing the first wall 111. On the projection plane perpendicular to the thickness direction z of the first wall, the orthographic projection of the second groove 135 and the orthographic projection of the pressure relief mechanism 16 at least partially overlap. The first groove 134 and the third through hole 13310 are both formed on the bottom wall of the second groove 135.

[0301] In some embodiments, a second groove 135 is formed on the outer side of the first insulating member 13, and both the first groove 134 and the third through hole 13310 are formed on the bottom wall of the second groove 135. Optionally, the shape of the second groove 135 is diverse, including but not limited to circular, square or other shapes.

[0302] In some embodiments, on a projection plane perpendicular to the thickness direction z of the first wall, the orthographic projection of the second groove 135 and the orthographic projection of the pressure relief mechanism 16 may completely overlap or partially overlap.

[0303] For example, the shape of the second groove 135 may correspond to the outer contour of the pressure relief mechanism 16 so that the second groove 135 has the function of avoiding the pressure relief mechanism 16.

[0304] Please refer to Figure 5. The first groove 134 is located in the middle of the bottom wall of the second groove 135. The bottom wall of the second groove 135 is divided into two regions along the second direction x. Each region is provided with a third through hole 13310.

[0305] In the above solution, by providing a second groove 135 on the side of the first insulating member 13 away from the electrode assembly 12, on the one hand, the pressure relief mechanism 16 can be avoided, reducing the interference of the pressure relief mechanism 16 on the second through hole 13300 and the third through hole 13310. On the other hand, a cavity can be formed between the pressure relief mechanism 16 and the second through hole 13300 and the third through hole 13310 to accommodate the gas passing through the second through hole 13300 and the third through hole 13310, thereby facilitating the pressure relief mechanism 16 to discharge the gas inside the battery cell 10, which in turn improves the reliability of the battery device 100.

[0306] According to some embodiments of this application, please refer to FIG12, which is a schematic diagram of the first wall 111, the first insulating member 13 and the blocking member 18 in some embodiments of this application.

[0307] The battery cell 10 also includes a blocking member 18 along the thickness direction z of the first wall. The blocking member 18 is disposed on the side of the first insulator 13 facing the electrode assembly 12. The blocking member 18 is configured to at least partially block the first through hole 1300 and allow fluid medium to flow through the blocking member 18 to the electrode assembly 12.

[0308] The blocking member 18 is a structural member disposed on the side of the first insulating member 13 facing the electrode assembly 12, for example, the blocking member 18 is disposed on the inner side of the insulating body 130. The blocking member 18 can be sheet-shaped, cylindrical, or other capable of preventing the electrolyte from flowing directly to the electrode assembly 12 along the thickness direction z of the first wall.

[0309] For example, the blocking member 18 may include a baffle structure comprising a first part and a second part, the first part being connected to the inner side of the first insulating member 13, and the second part being perpendicularly connected to the first part to guide the flow of the electrolyte in a direction not parallel to the thickness direction z of the first wall.

[0310] For example, the blocking member 18 can be a cylindrical structure, which includes a side wall 182 and a bottom wall 181. The side wall 182 is disposed around the edge of the first through hole 1300 and the edge of the bottom wall 181, and an opening is made in the side wall 182 to allow the electrolyte to drain.

[0311] In the above solution, by setting a blocking member 18 at the position corresponding to the first through hole 1300, the electrolyte can be restricted from directly acting on the electrode assembly 12, reducing the risk of structural damage to the electrode assembly 12 due to direct impact of the electrolyte, resulting in high internal structural stability of the battery cell 10, which is beneficial to improving the reliability of the battery device 100.

[0312] According to some embodiments of this application, the blocking member 18 is provided with a liquid outlet 180, the orientation of the liquid outlet 180 is perpendicular to the thickness direction z of the first wall, and the orientation of the liquid outlet 180 intersects with the second direction x.

[0313] The blocking member 18 has a liquid outlet 180, which is used to guide the electrolyte injected through the injection hole 1110 out. Exemplarily, after the electrolyte is injected through the injection hole 1110, it enters the first through hole 1300. Guided by the blocking member 18, the electrolyte is discharged through the liquid outlet 180. The orientation of the liquid outlet 180 can be understood as the main flow direction of the electrolyte when it enters between the first insulating member 13 and the electrode assembly 12. The main flow direction can be understood as, under the action of gravity or injection pressure, a portion of the electrolyte discharged from the liquid outlet 180 can also flow along the thickness direction z of the first wall towards the electrode assembly 12.

[0314] In some embodiments, the orientation of the outlet 180 can be understood as the direction of the center line of the central angle corresponding to the outlet 180. "The orientation of the outlet 180 intersects with the second direction x" can be understood as the center line of the central angle corresponding to the outlet 180 not being parallel to the second direction x, and the angle between them can be 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90° or other values.

[0315] In some embodiments, the second direction x can be the width direction of the first wall 111, the first direction y can be the length direction of the first wall 111, the space between the first insulating member 13 and the electrode assembly 12 in the second direction x is smaller, and the space in the first direction y is larger.

[0316] In the above scheme, the electrolyte is discharged from the outlet 180 of the blocking member 18. By setting the orientation of the outlet 180 to intersect with the second direction x, the electrolyte can be discharged to the side with a larger space between the first insulating member 13 and the electrode assembly 12, so that more electrolyte can be injected into the casing 11 within a certain period of time, thereby making the electrolyte injection efficiency high and thus improving the reliability of the battery device 100.

[0317] According to some embodiments of this application, the orientation of the outlet 180 is parallel to the first direction y.

[0318] In some embodiments, the direction of the center line of the central angle corresponding to the outlet 180 is parallel to the first direction y, that is, the electrolyte is discharged from the outlet 180 and the flow direction of the electrolyte is mainly in the first direction y. For example, the first through hole 1300 points in the direction of the third boss 133, or the first through hole 1300 is away from the side of the first boss 131.

[0319] In the above scheme, the first direction y can be the length direction of the first wall 111. In the first direction y, the space between the first insulating member 13 and the electrode assembly 12 is relatively large. Therefore, the liquid outlet 180 is set to face the first direction y, which can effectively improve the liquid injection efficiency of the electrolyte and improve the reliability of the battery device 100.

[0320] According to some embodiments of this application, please refer to FIG13, which is a schematic diagram of the first insulating member 13 in some embodiments of this application, wherein the direction of electrolyte flow is indicated by arrows in FIG13. The outlet 180 is disposed toward the third protrusion 133.

[0321] In some embodiments, the outlet 180 is disposed facing the third protrusion 133. The electrolyte enters the blocking member 18 through the first through hole 1300 and is discharged from the outlet 180 by the guide of the blocking member 18. The discharged electrolyte can flow towards the third protrusion along the first direction y, and can enter the second groove 135 and the first groove 134 through the third through hole 13310 of the third protrusion. It can be divided into multiple streams of fluid, which flow to the electrode assembly 12 through the second through hole 13300 and to the electrode assembly 12 through the third through hole 13310 on the other side, respectively.

[0322] In the above scheme, by setting the outlet 180 toward the third protrusion 133, the electrolyte discharged from the outlet 180 can pass through the through hole on the third protrusion 133, thereby increasing the length of the electrolyte injection path and allowing more electrolyte to be injected into the casing 11 within a certain time, thereby improving the electrolyte injection efficiency and the manufacturing efficiency of the battery cell 10.

[0323] According to some embodiments of this application, along the first direction y, the third boss 133 is located at the middle of the first insulating member 13.

[0324] In some embodiments, the third boss 133 is located in the middle of the first insulating member 13, and the first through hole 1300 is eccentrically disposed to the first insulating member 13. In these embodiments, the space on the side of the liquid outlet 180 facing the third boss 133 is larger than the space on the side away from the third boss 133.

[0325] In the above scheme, by setting the third protrusion 133 in the middle of the first insulating member 13, on the one hand, it is beneficial for the gas inside the battery cell 10 to be discharged in the middle of the first insulating member 13 and discharged through the pressure relief mechanism 16; on the other hand, it enables the liquid outlet 180 to face the side with a larger space between the first insulating member 13 and the electrode assembly 12, thereby allowing more electrolyte to be injected into the casing 11 within a certain period of time, thereby improving the electrolyte injection efficiency and the manufacturing efficiency of the battery cell 10.

[0326] According to some embodiments of this application, please refer to FIG12. The blocking member 18 includes a bottom wall 181 and a side wall 182. Along the thickness direction z of the first wall, one end of the side wall 182 surrounds the first through hole 1300, and the other end of the side wall 182 is connected to the bottom wall 181. The liquid outlet 180 is formed in the side wall 182.

[0327] In some embodiments, the blocking member 18 may have a cylindrical structure, including a sidewall 182 and a bottom wall 181. One end of the sidewall 182 surrounds the edge of the first through hole 1300, and the other end of the sidewall 182 surrounds the edge of the bottom wall 181. Optionally, the shape of the first through hole 1300 corresponds to the shape of the bottom wall 181. For example, if the third through hole 13310 is a circular hole, then the bottom wall 181 is circular.

[0328] "The outlet 180 is formed on the side wall 182" can be understood as an opening in the side wall 182 to form the outlet 180, or the removal of part of the side wall 182 to form the outlet 180.

[0329] In the above scheme, the blocking member 18 has a simple structure. By blocking the bottom wall 181 and the side wall 182, the electrolyte can be restricted to be discharged only from the outlet 180, thereby controlling the discharge direction of the electrolyte, which can improve the electrolyte injection efficiency and thus improve the manufacturing efficiency of the battery cell 10.

[0330] According to some embodiments of this application, please refer to Figure 14, which is a partial structural schematic diagram of the first insulating member 13 in some embodiments of this application. Along the circumference of the first through hole 1300, the central angle α corresponding to the liquid outlet 180 is not less than 50° and not greater than 270°.

[0331] Along the circumference of the first through hole 1300, the central angle α corresponding to the liquid outlet 180 can be understood as the included angle between the two opposite wall surfaces of the liquid outlet 180 along the circumference of the first through hole 1300. The circumference of the first through hole 1300 is the direction surrounding the axial direction of the first through hole 1300.

[0332] The value of the central angle α corresponding to the outlet 180 can be 50°, 60°, 70°, 80°, 90°…170°, 180°, 190°, 200°, 210°, 220°, 230°, 240°, 250°, 260°, 270° or any value between two adjacent values.

[0333] In the above scheme, by setting the size of the central angle corresponding to the liquid outlet 180 to not less than 50°, the electrolyte can be discharged from the liquid outlet 180 at a faster speed, which is conducive to improving the liquid injection efficiency; by setting the size of the central angle corresponding to the liquid outlet 180 to not more than 50°, the impact of setting the liquid outlet 180 on the structural strength of the blocking member 18 can be reduced.

[0334] According to some embodiments of this application, the blocking member 18 is integrally formed with the first insulating member 13.

[0335] In some embodiments, the blocking member 18 and the first insulating member 13 can be manufactured by an integral molding process, such as injection molding, hot melt molding or other integral molding processes.

[0336] In the above scheme, by making the blocking member 18 and the first insulating member 13 integrally formed, the structural strength of the first insulating member 13 and the blocking member 18 can be high, so as to adapt to higher injection pressure, thereby improving the injection efficiency.

[0337] In other embodiments, the blocking member 18 and the first insulating member 13 are separate structures, and are connected by bonding, welding, riveting, threaded connection or other connection relationships.

[0338] According to some embodiments of this application, the capacity of the battery cell 10 is greater than or equal to 500Ah.

[0339] In some embodiments, the capacity of a single battery cell 10 can refer to the total amount of charge stored in a single battery cell 10, and its unit can be Ah, ampere-hour.

[0340] In some embodiments, the capacity of the battery cell 10 provided above may be greater than or equal to 500Ah, such as 500Ah, 550Ah, 600Ah or larger.

[0341] The battery cell 10 provided by the above solution has a high liquid injection efficiency. When the capacity of the battery cell 10 is greater than or equal to 500Ah, the liquid injection efficiency of the battery cell 10 can be effectively improved, thereby effectively improving the manufacturing efficiency of the battery cell 10 and the battery device 100 using the battery cell 10.

[0342] According to some embodiments of this application, please refer to FIG15, which is a schematic diagram of a battery cell 10 in some embodiments of this application.

[0343] The outer shell 11 is a square shell. The dimension of the outer shell 11 in the first direction y is W1, the dimension of the outer shell 11 in the second direction x is T1, and the dimension of the outer shell 11 in the thickness direction z of the first wall is H1, satisfying 3720cm. 3 ≤W1*T1*H1≤12500cm 3 , 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm.

[0344] The first direction y can be the width direction of the battery cell 10, the second direction x can be the thickness direction of the battery cell 10, and the thickness direction z of the first wall can be the height direction of the battery cell 10.

[0345] The statement “The outer casing 11 has a dimension of W1 in the first direction y, a dimension of T1 in the second direction x, and a dimension of H1 in the thickness direction z of the first wall” can be understood as the outer casing 11 of the battery cell 10 having a thickness of T1, a width of W1, and a height of H1.

[0346] In some embodiments, the thickness of the outer casing 11 is T1, the width is W1, and the height is H1, which can satisfy the following condition: 3720cm 3 ≤W1*T1*H1≤12500cm 3 , 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm.

[0347] For example, W1*T1*H1 is the value obtained by multiplying W1, T1, and H1, and W1*T1*H1 can take the value 3720cm. 3 Up to 12500cm 3 Any value between, and the two values.

[0348] For example, the value of T1 can be no less than 60mm and no more than 150mm. For example, the value of T1 can be 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm or any value between two adjacent values.

[0349] For example, the value of H1 can be no less than 120mm and no more than 400mm. For example, the value of T1 can be 120mm, 130mm, 140mm, 150mm, 160mm...360mm, 370mm, 380mm, 390mm, 400mm or any value between two adjacent values.

[0350] For example, the value of W1 can be no less than 200mm and no more than 1500mm. For example, the value of T1 can be 2000mm, 210mm, 220mm, 230mm, 240mm...1360mm, 1370mm, 1380mm, 1390mm, 1400mm or any value between two adjacent values.

[0351] According to some embodiments of this application, the outer casing 11 is a steel casing.

[0352] In some embodiments, the outer casing 11 may be made of steel or stainless steel. In some embodiments, the outer casing 11 is a steel casing, and the thickness of the outer casing 11 may be thinner than that of an aluminum casing, in order to improve the volumetric energy density of the battery cell 10.

[0353] According to some embodiments of this application, some embodiments of this application also provide a battery device 100, which includes the battery cell 10 provided above.

[0354] As shown in Figure 2, the battery device 100 may also include a housing 20, in which the battery cells 10 are housed.

[0355] In some embodiments, the housing 20 may include a first housing body 21 and a second housing body 22, the first housing body 21 and the second housing body 22 covering each other, the first housing body 21 and the second housing body 22 together defining an assembly space for accommodating the battery cell 10.

[0356] Optionally, the second box body 22 can be a hollow structure with one end open, and the first box body 21 can be a plate-like structure. The first box body 21 covers the open side of the second box body 22 so that the first box body 21 and the second box body 22 together define the assembly space; the first box body 21 and the second box body 22 can also be hollow structures with one side open, and the open side of the first box body 21 covers the open side of the second box body 22.

[0357] Of course, the box 20 formed by the first box body 21 and the second box body 22 can be of various shapes, such as a cylinder or a cuboid. For example, in Figure 2, the box 20 is a cuboid structure.

[0358] Optionally, the battery cell 10 disposed within the housing 20 can be one or more. For example, in Figure 2, the housing 20 of the battery device 100 contains multiple battery cells 10, which can be connected in series, parallel, or a combination thereof. A combination thereof means that some of the battery cells 10 are connected in series and others in parallel. Multiple battery cells 10 can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of the multiple battery cells 10 is housed within the housing 20. Alternatively, the battery device 100 can also consist of multiple battery cells 10 first connected in series, parallel, or a combination thereof to form a battery module, and then these battery modules are connected in series, parallel, or a combination thereof to form a whole, which is then housed within the housing 20.

[0359] The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component that connects multiple battery cells 10 to achieve electrical connection between the multiple battery cells 10.

[0360] It should be noted that in some embodiments, the battery device 100 may not have a housing 20. The battery device 100 includes multiple battery cells 10, and the battery device 100 composed of multiple battery cells 10 can be directly mounted onto the electrical device to provide power to the electrical device through the multiple battery cells 10. That is, the housing 20 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 20 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 20 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 20 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0361] Some embodiments of this application also provide an electrical device, which includes the battery cell 10 provided above and / or the battery device 100 provided above, wherein the battery cell 10 is used to provide electrical energy.

[0362] The electrical device can be any of the aforementioned devices or systems that utilize battery cells 10 and / or battery devices 100. For example, the electrical device can be a vehicle 1000, which can be a range-extended vehicle 1000, a pure electric vehicle 1000, or a gasoline-powered vehicle 1000. The electrical energy provided by the battery cells 10 can be used to meet the power needs of the vehicle 1000 during startup, navigation, and operation.

[0363] According to some embodiments of this application, a battery cell 10 is provided, as shown in Figures 3-14.

[0364] The battery cell 10 can be a square battery cell, and includes a housing 11, an electrode assembly 12, electrode terminals 14, a pressure relief mechanism 16, and a first insulating member 13. The housing 11 may include a shell 110 and a first wall 111. The shell 110 has an opening, through which the electrode assembly 12 can be inserted. The first wall 111 is connected to the shell 110 and closes the opening, so that the electrode assembly 12 is in a closed space. There are two electrode terminals 14 with opposite polarities. One is a positive terminal and is electrically connected to the positive electrode tab 121 of the electrode assembly 12, and the other is a negative terminal and is electrically connected to the negative electrode tab 121 of the electrode assembly 12. The two electrode terminals 14 with opposite polarities are spaced apart on the first wall 111 along a first direction y.

[0365] The electrode assembly 12 has a flat region 1200 in its electrode sheet 120. The flat regions 1200 of the positive and negative electrodes of the electrode assembly 12 are stacked along the second direction x, and the first direction y, the second direction x, and the thickness direction z of the first wall are mutually perpendicular. A pressure relief mechanism 16 is disposed on the first wall 111 to release the internal pressure of the battery cell 10. The first wall 111 is provided with an injection hole 1110 for injecting electrolyte into the battery cell 10.

[0366] The first insulating member 13 may be made of plastic. The first insulating member 13 may include an insulating body 130, the side of which faces away from the electrode assembly 12 and can be connected to the first wall 111. The insulating body 130 may have a terminal through-hole 1301 through which a power supply terminal 14 passes to connect with a corresponding tab 121. The insulating body 130 has a first through-hole 1300, which corresponds to the liquid injection hole 1110, allowing electrolyte to flow into the side of the first insulating member 13 facing the electrode assembly 12.

[0367] The first insulating member 13 further includes a first boss 131, a second boss 132, and a third boss 133. The first boss 131, the second boss 132, and the third boss 133 are disposed on the side of the insulating body 130 facing the electrode assembly 12, and along the first direction y, the third boss 133 is located between the first boss 131 and the second boss 132. The first boss 131 is located at one end of the insulating body 130 along the first direction y, and the second boss 132 is located at the other end of the insulating body 130.

[0368] In some embodiments, along the first direction y, the first boss 131 is closer to the first through hole 1300 than the second boss 132. A first receiving groove 1310 is formed on the side of the first boss 131 near the first through hole 1300, and a second receiving groove 1320 is provided on the side of the second boss 132 facing the first through hole 1300. The width of the first receiving groove 1310 along the second direction x is K2, and the width of the second receiving groove 1320 along the second direction x is K3, satisfying 0.05≤(K2-K3) / K2≤0.2.

[0369] In the above scheme, the electrolyte enters the battery cell 10 through the injection hole 1110 and the first through hole 1300. By forming a first receiving groove 1310 on the side of the first boss 131 near the first through hole 1300, and forming a second receiving groove 1320 on the side of the second boss 132 near the first through hole 1300, additional space can be provided for the electrolyte to enter the battery cell 10, thereby allowing more electrolyte to be injected in a certain period of time, which improves the electrolyte injection efficiency and makes the battery cell 10 have higher manufacturing efficiency, which in turn helps to improve the manufacturing efficiency of the battery device 100.

[0370] In some embodiments, the insulating body 130 is recessed towards one side of the electrode assembly 12 from the side opposite to the electrode assembly 12 to form a second groove 135, and the middle portion of the second groove 135 is recessed towards one side of the electrode assembly 12 to form a first groove 134. The insulating body 130 protrudes towards the electrode assembly 12 corresponding to the position of the first groove 134 to form a third boss 133. The position of the second groove 135 corresponds to the position of the pressure relief mechanism 16, and the second groove 135 can avoid the pressure relief mechanism 16, with a gap between the bottom wall of the second groove 135 and the pressure relief mechanism 16.

[0371] The third boss 133 can be used to restrict the movement of the electrode assembly 12. The third boss 133 has a first surface 1330 facing the electrode assembly 12, and the first surface 1330 can contact the end face of the electrode assembly 12. The third boss 133 is provided with a second through hole 13300, which penetrates the first insulating member 13. The second through hole 13300 can be an elongated hole, and its length direction is parallel to the second direction x.

[0372] The bottom wall of the second groove 135 is also provided with a third through hole 13310. There are multiple third through holes 13310, which are located on both sides of the first groove 134 along the first direction y. The third through hole 13310 can be an elongated hole, and its length direction is parallel to the first direction y. That is, the length direction of the third through hole 13310 is perpendicular to the length direction of the second through hole 13300.

[0373] By providing a second through hole 13300 on the third protrusion 133, on the one hand, it facilitates the discharge of gas inside the battery cell 10 through the first insulating member 13 and the pressure relief mechanism 16, thereby reducing the risk of thermal runaway of the battery cell 10; on the other hand, by setting the length direction of the second through hole 13300 parallel to the second direction x, it can effectively reduce the risk of damage to the electrode 120 structure caused by the insertion of the electrode 120 into the second through hole 13300, resulting in a short circuit inside the battery cell 10, thereby improving the reliability of the battery cell 10 and thus making the battery device 100 highly reliable. Furthermore, by providing a third through hole 13310 perpendicular to the second through hole 13300, the structural strength of the first insulating member 13 can be improved, enabling the first insulating member 13 to effectively perform its insulating and protective function.

[0374] In some embodiments, the insulating body 130 is further provided with a blocking member 18 on the side facing the electrode assembly 12. The blocking member 18 is configured to at least partially block the first through hole 1300 to guide the electrolyte from directly impacting the electrode assembly 12. Optionally, the blocking member 18 is provided with a liquid outlet 180, which is disposed facing the third boss 133.

[0375] In the above scheme, by setting the outlet 180 toward the third protrusion 133, the electrolyte discharged from the outlet 180 can pass through the through holes (such as the second through hole 13300 and the third through hole 13310) on the third protrusion 133, thereby increasing the length of the electrolyte injection path. This allows more electrolyte to be injected into the casing 11 within a certain time, thereby improving the electrolyte injection efficiency and the manufacturing efficiency of the battery cell 10.

[0376] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, wherein, include: The outer casing has a first wall, and the first wall is provided with a liquid injection hole; Electrode assembly, disposed within the housing; A first insulating element is disposed within the housing and located between the first wall and the electrode assembly. The first insulating element includes an insulating body and a first protrusion. The first protrusion is formed on the side of the insulating body facing the electrode assembly and located at one end of the insulating body in a first direction. The insulating body is provided with a first through hole corresponding to the position of the injection hole. The first direction is perpendicular to the thickness direction of the first wall. Along the first direction, a first receiving groove is formed on the side of the first boss near the first through hole.

2. The battery cell according to claim 1, wherein, Along the first direction, the first receiving groove does not penetrate the first boss.

3. The battery cell according to claim 1 or 2, wherein, Along the thickness direction of the first wall, the first receiving groove opens toward one side of the electrode assembly.

4. The battery cell according to any one of claims 1-3, wherein, The first insulating member further includes a second protrusion, which is formed on the side of the insulating body facing the electrode assembly, and the second protrusion is located at the other end of the insulating body in the first direction. Along the first direction, a second receiving groove is provided on the side of the second protrusion facing the first through hole.

5. The battery cell according to claim 4, wherein, Along the first direction, the first boss is closer to the first through hole than the second boss, the width of the first receiving groove along the second direction is greater than the width of the second receiving groove along the second direction, and the first direction, the second direction and the thickness direction of the first wall are perpendicular to each other.

6. The battery cell according to claim 5, wherein, The width of the first receiving groove along the second direction is K2, and the width of the second receiving groove along the second direction is K3, satisfying 0.05≤(K2-K3) / K2≤0.

2.

7. The battery cell according to any one of claims 1-6, wherein, The number of the first receiving slots is multiple, and the multiple first receiving slots are arranged at intervals along the second direction, with the first direction, the second direction and the thickness direction of the first wall being perpendicular to each other.

8. The battery cell according to claim 7, wherein, Along the second direction, the first boss includes a first wall portion, a second wall portion, a third wall portion, and a first protrusion. The first wall portion and the second wall portion are spaced apart along the second direction. The end of the first wall portion away from the first through hole and the end of the second wall portion away from the first through hole are connected through the third wall portion. Along the second direction, the first protrusion is located between the first wall portion and the second wall portion. Along the second direction, the first protrusion and the first wall portion are spaced apart and form a first receiving groove, and the first protrusion and the second wall portion are spaced apart and form a first receiving groove.

9. The battery cell according to claim 8, wherein, The battery cell further includes a second insulating member, at least a portion of which covers the electrode assembly, and the second insulating member is connected to at least one of the outer surface of the first wall, the outer surface of the second wall, and the outer surface of the third wall.

10. The battery cell according to claim 8 or 9, wherein, Along the direction from the first wall toward the electrode assembly, the first protrusion protrudes from the first wall portion, the second wall portion, and the third wall portion.

11. The battery cell according to claim 10, wherein, Along the thickness direction of the first wall, the side of the first wall facing the electrode assembly, the side of the second wall facing the electrode assembly, and the side of the third wall facing the electrode assembly are flush with each other.

12. The battery cell according to claim 11, wherein, Along the direction from the first wall toward the electrode assembly, the first protrusion protrudes from the first wall by an amount not less than 0.2 mm and not more than 3 mm.

13. The battery cell according to any one of claims 1-12, wherein, The width of the first insulating member along the second direction is K1, and the width of the first receiving groove along the second direction is K2, satisfying 0.1≤K2 / K1≤0.6, and the first direction, the second direction and the thickness direction of the first wall are mutually perpendicular.

14. The battery cell according to any one of claims 1-13, wherein, The battery cell also includes a pressure relief mechanism disposed on the first wall; the electrode assembly includes an electrode sheet having a flat area, the flat area being stacked along a second direction, the first direction, the second direction, and the thickness direction of the first wall being mutually perpendicular; The first insulating member further includes a third boss, the third boss having a first surface facing the electrode assembly, the first surface having a second through hole along the thickness direction of the first wall, the second through hole penetrating the first insulating member, and the length direction of the first through hole intersecting the first direction.

15. The battery cell according to claim 14, wherein, The length direction of the second through hole is parallel to the second direction.

16. The battery cell according to claim 14 or 15, wherein, The width of the second through hole is not less than 0.5 mm and not more than 5 mm.

17. The battery cell according to any one of claims 14-16, wherein, Along the thickness direction of the first wall, the projection of the pressure relief mechanism onto the first insulating member at least partially covers the second through hole.

18. The battery cell according to any one of claims 14-17, wherein, The first insulating member has a first groove on the side facing the first wall that corresponds to the position of the third protrusion, and the second through hole is disposed on the bottom wall of the first groove.

19. The battery cell according to claim 18, wherein, The first insulating member has a second surface facing the electrode assembly, pointing towards the electrode assembly along the first wall, the first surface protruding from the second surface, the second surface having a third through hole, and the projection of the pressure relief mechanism onto the first insulating member at least partially covering the third through hole along the thickness direction of the first wall.

20. The battery cell according to claim 19, wherein, The length direction of the third through hole intersects the length direction of the second through hole.

21. The battery cell according to claim 20, wherein, The length direction of the second through hole is parallel to the second direction, and the length direction of the third through hole is parallel to the first direction.

22. The battery cell according to claim 19 or 21, wherein, The first insulating member has a second groove formed on the side facing the first wall. On the projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the second groove and the orthographic projection of the pressure relief mechanism at least partially overlap. The first groove and the third through hole are both formed on the bottom wall of the second groove.

23. The battery cell according to any one of claims 14-22, wherein, The battery cell also includes a blocking member disposed along the thickness direction of the first wall on the side of the first insulating member facing the electrode assembly. The blocking member is configured to at least partially block the first through hole and allow fluid medium to flow through the blocking member to the electrode assembly.

24. The battery cell according to claim 23, wherein, The blocking member is provided with a liquid outlet, the direction of which is perpendicular to the thickness direction of the first wall, and the direction of which intersects with the second direction.

25. The battery cell according to claim 24, wherein, The outlet is oriented parallel to the first direction.

26. The battery cell according to claim 25, wherein, The liquid outlet is positioned facing the third protrusion.

27. The battery cell according to claim 26, wherein, Along the first direction, the third boss is located at the middle of the first insulating member.

28. The battery cell according to any one of claims 24-27, wherein, The blocking member includes a bottom wall and a side wall. Along the thickness direction of the first wall, one end of the side wall surrounds the first through hole, and the other end of the side wall is connected to the bottom wall. The liquid outlet is formed in the side wall.

29. The battery cell according to any one of claims 24-28, wherein, Along the circumference of the first through hole, the central angle α corresponding to the liquid outlet is not less than 50° and not greater than 270°.

30. The battery cell according to any one of claims 23-29, wherein, The blocking component is integrally formed with the first insulating component.

31. The battery cell according to any one of claims 1-30, wherein, The capacity of the battery cell is greater than or equal to 500Ah.

32. The battery cell according to claim 31, wherein, The outer shell is a square shell. The dimension of the outer shell in the first direction is W1, the dimension of the outer shell in the second direction is T1, and the dimension of the outer shell in the thickness direction of the first wall is H1, satisfying 3720cm. 3 ≤W1*T1*H1≤12500cm 3 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm, and the first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other.

33. The battery cell according to any one of claims 1-32, wherein, The outer shell is made of steel.

34. A battery device, wherein, Includes the battery cell described in any one of claims 1-33.

35. An electrical appliance, wherein, Includes the battery cell according to any one of claims 1-33, and / or the battery device according to claim 34, wherein the battery cell is used to provide electrical energy.

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