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, a pressure relief mechanism, an electrode assembly, and a first insulating member. The casing has a first wall. The pressure relief mechanism is provided on the first wall. The electrode assembly is provided in the casing. The electrode assembly comprises electrode sheets. The electrode sheets each have a flat region. The flat regions are stacked in a first direction. The first insulating member is provided in the casing and located between the first wall and the electrode assembly. The first insulating member comprises a first boss. The first boss has a first surface facing the electrode assembly. First through holes are formed in the first surface. The first through holes run through the first insulating member in the thickness direction of the first wall. The length direction of the first through holes intersects with the second direction, and the first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other. The technical solution provided by the present application can effectively improve the reliability of battery devices.

Description

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

[0001] This application claims priority to Chinese patent application 202411535215.3, 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 reliability 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 reliability 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 casing, a pressure relief mechanism, an electrode assembly, and a first insulating member. The casing has a first wall. The pressure relief mechanism is disposed on the first wall. The electrode assembly is disposed within the casing and includes electrode plates, each electrode plate having a flat region, which are stacked along a first direction. The first insulating member is disposed within the casing and located between the first wall and the electrode assembly. The first insulating member includes a first boss, the first boss having a first surface facing the electrode assembly, and the first surface having a first through hole that penetrates the first insulating member along the thickness direction of the first wall. The length direction of the first through hole intersects with a second direction, and the first direction, the second direction, and the thickness direction of the first wall are mutually perpendicular.

[0008] In the above scheme, the first insulating member includes a first boss, which can be used to limit the movement of the electrode assembly, making the internal structure of the battery cell stable and reliable, thus improving the reliability of the battery cell. By setting a first through hole in the first boss, on the one hand, it facilitates the gas inside the battery cell to pass through the first insulating member 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 first through hole to intersect with the length direction of the electrode sheet located in the flat region can effectively reduce the risk of the electrode sheet being damaged due to insertion into the first 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.

[0009] According to some embodiments of this application, the length direction of the first through hole is parallel to the first direction.

[0010] In the above scheme, the first direction is the stacking direction of the flat area of ​​the electrode sheet, which is perpendicular to the length direction of the electrode sheet in the flat area. In this regard, by making the length direction of the first through hole parallel to the first direction, the first through hole and the electrode sheet corresponding to the first through hole can be arranged perpendicularly and staggered, which effectively reduces the risk of structural damage caused by the electrode sheet being inserted into the first 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.

[0011] According to some embodiments of this application, the width of the first through hole is not less than 0.5 mm and not more than 5 mm.

[0012] In the above scheme, by setting the width of the first through hole to be no less than 0.5 mm, the gas inside the battery cell can be discharged through the first through hole 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 first through hole to be no more than 5 mm, the risk of damage to the electrode due to insertion into the first through hole can be reduced, and the impact on the structural strength of the first insulating component due to an excessively large first 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 first 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, thereby improving the reliability of the battery device.

[0013] According to some embodiments of this application, there are multiple first through holes, and the multiple first through holes are arranged in a rectangular array.

[0014] In the above scheme, on the one hand, by setting the number of first through holes to multiple, the efficiency of gas passing through the first insulating component inside the battery cell can be improved, thereby allowing it to be quickly discharged by the pressure relief mechanism; on the other hand, setting the multiple first through holes to a rectangular array for discharge, so that the interval between two adjacent first through holes is reduced, thereby reducing the risk of electrode insertion, resulting in high structural stability of the electrode assembly, which is conducive to improving the reliability of the battery cell, and thus to improving the reliability of the battery device.

[0015] 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 first through hole.

[0016] In the above scheme, the location of the first 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 first through hole and be discharged to the outside through the pressure relief mechanism, resulting in high pressure relief efficiency of the battery cell, which in turn improves the reliability of the battery cell and thus the reliability of the battery device.

[0017] According to some embodiments of this application, a first groove corresponding to the position of the first boss is formed on the side of the first insulating member away from the electrode assembly, and a first through hole is disposed on the bottom wall of the first groove.

[0018] 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 first boss, on the one hand, the pressure relief mechanism can be avoided, reducing the interference of the pressure relief mechanism on the first through hole. On the other hand, a cavity can be formed between the pressure relief mechanism and the first boss to accommodate the gas passing through the first 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.

[0019] According to some embodiments of this application, the first insulating member has a second surface facing the electrode assembly. Along the direction of the first wall pointing towards the electrode assembly, the first surface protrudes from the second surface, and the second surface is provided with a second through-hole. In 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.

[0020] In the above scheme, by setting a second through hole, the path of gas inside the battery cell through the first insulating component to be discharged by the pressure relief mechanism can be increased, so that the internal gas can be discharged through the first through hole and the second through hole, thereby improving the pressure relief efficiency of the battery cell, making the battery cell more reliable, and thus making the battery device more reliable.

[0021] According to some embodiments of this application, the length direction of the second through hole intersects the length direction of the first through hole.

[0022] 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 second through hole to intersect with the length direction of the first 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.

[0023] 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.

[0024] In the above scheme, 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 impact on the structural strength of the first insulating component caused by the excessive size of the second through hole 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, thereby improving the reliability of the battery device.

[0025] According to some embodiments of this application, the length direction of the first through hole is parallel to the first direction, and the length direction of the second through hole is parallel to the second direction.

[0026] In the above solution, on the one hand, by making the length direction of the first through hole parallel to the first direction, the first 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 first 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 second through hole to be parallel to the second direction, that is, perpendicular to the length direction of the first 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.

[0027] According to some embodiments of this application, there are multiple second through holes, which are distributed on both sides of the first boss along the second direction.

[0028] In the above scheme, by arranging multiple second through holes on both sides of the first boss along the second direction, it can improve the pressure relief efficiency of the battery cell and compensate for the strength loss of the first insulating component caused by the setting of the first through hole, thereby stabilizing the internal structure of the battery cell and improving the reliability of the battery device.

[0029] According to some embodiments of this application, a second groove is formed on the side of the first insulating member away from the electrode assembly. 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 second through hole are both formed on the bottom wall of the second groove.

[0030] 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 first through hole and the second through hole. On the other hand, a cavity can be formed between the pressure relief mechanism and the first through hole and the second through hole to accommodate the gas passing through the first through hole and 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.

[0031] According to some embodiments of this application, the first insulating member further includes an insulating body and a second protrusion, both the first protrusion and the second protrusion being formed on the side of the insulating body facing the electrode assembly, and the first protrusion and the second protrusion being arranged at intervals along a second direction.

[0032] In the above scheme, by setting a second protrusion on one side of the first protrusion along the second direction, the movement of the electrode assembly along the thickness direction of the first wall can be effectively restricted, reducing the risk of the internal circuit of the battery cell being disconnected, thereby improving the reliability of the battery cell and thus improving the reliability of the battery device.

[0033] According to some embodiments of this application, the first wall is provided with a liquid injection hole, and the insulating body is provided with a third through hole corresponding to the position of the liquid injection hole. Along the second direction, the third through hole is located between the first boss and the second boss.

[0034] In the above solution, by setting a third through hole on the insulating body, and the third through hole being located between the first boss and the second boss, on the one hand, the electrolyte can be injected through the injection hole and enter the electrode assembly through the third through hole; on the other hand, a space for containing electrolyte can be formed between the first boss and the second boss, thereby improving the electrolyte injection speed and thus facilitating the improvement of battery cell manufacturing efficiency.

[0035] According to some embodiments of this application, a first receiving groove is provided on the side of the second boss facing the first boss along the second direction.

[0036] In the above scheme, by setting a first receiving groove on the side of the second protrusion facing the first protrusion, the electrolyte injected through the injection hole and the third through hole can be contained, thereby injecting more electrolyte into the battery cell within a certain period of time, so as to improve the electrolyte injection efficiency and thus improve the manufacturing efficiency of the battery cell.

[0037] According to some embodiments of this application, the first receiving groove does not penetrate the second boss along the second direction.

[0038] In the above scheme, the first receiving groove is a blind hole structure. The end of the first receiving groove away from the first boss does not penetrate the second boss, which can reduce the loss of structural strength of the first insulating component 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.

[0039] 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.

[0040] 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.

[0041] According to some embodiments of this application, there are multiple first receiving slots, and the multiple first receiving slots are arranged at intervals along a first direction.

[0042] In the above scheme, by setting up multiple first receiving tanks and arranging them at intervals along the first direction, the electrolyte injected through the injection hole and the third 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.

[0043] According to some embodiments of this application, along a first direction, the second 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 first direction. The end of the first wall portion away from the first boss and the end of the second wall portion away from the first boss are connected through the third wall portion. Along the first direction, the first protrusion is located between the first wall portion and the second wall portion. Along the first 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.

[0044] In the above scheme, the second protrusion 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 allows for the rapid accommodation of electrolyte injected through the injection hole and the third through hole, thereby meeting the requirement for faster electrolyte injection speed, improving injection efficiency, and thus improving the manufacturing efficiency of the battery cell.

[0045] According to some embodiments of this application, the battery cell further includes a second insulating member, which at least partially encloses 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] In the above scheme, 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 second boss can be improved, the manufacturing difficulty of the first insulating component can be reduced, and the manufacturing efficiency of the battery cell can be improved.

[0051] 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.

[0052] 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.

[0053] According to some embodiments of this application, the first insulating member further includes a third boss, which is formed on the side of the insulating body facing the electrode assembly. The third boss, the first boss, and the second boss are arranged sequentially at intervals along a second direction. Along the second direction, a second receiving groove is provided on the side of the third boss facing the first boss.

[0054] In the above scheme, by setting a third protrusion on the side of the first protrusion away from the second protrusion, it can restrict the movement of the electrode assembly. On the other hand, by setting a second receiving groove on the side of the third protrusion facing the first protrusion, it can provide more space for the electrolyte, thereby improving the electrolyte injection efficiency and thus improving the battery cell manufacturing efficiency.

[0055] According to some embodiments of this application, the width of the first receiving groove along the first direction is greater than the width of the second receiving groove along the first direction.

[0056] 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 first direction to be larger, it can more timely contain the electrolyte injected through the third 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.

[0057] According to some embodiments of this application, a first wall is provided with an injection hole, and a first insulating member is provided with a third through hole corresponding to the position of the injection hole. The battery cell also includes a blocking member disposed on the side of the first insulating member facing the electrode assembly, and the blocking member is configured to at least partially block the third through hole.

[0058] In the above solution, by setting a blocking component at the position corresponding to the third 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.

[0059] 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 first direction.

[0060] 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 first 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 manufacturing efficiency of the battery device.

[0061] According to some embodiments of this application, the orientation of the liquid outlet is parallel to the second direction.

[0062] In the above scheme, the second direction can be the length direction of the first wall. In the second direction, the space between the first insulating member and the electrode assembly is relatively large. Therefore, setting the outlet to face the second direction can effectively improve the electrolyte injection efficiency and help improve the manufacturing efficiency of the battery device.

[0063] According to some embodiments of this application, the first insulating member includes an insulating body, a first boss is formed on the side of the insulating body facing the electrode assembly, a third through hole and a blocking member are disposed on the insulating body, and the liquid outlet is disposed facing the first boss.

[0064] In the above scheme, by setting the outlet towards the first protrusion, the electrolyte discharged from the outlet can pass through the through hole on the first 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.

[0065] According to some embodiments of this application, the first boss is located in the middle of the first insulating member along the second direction.

[0066] In the above scheme, by setting the first 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.

[0067] 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 third 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.

[0068] 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.

[0069] According to some embodiments of this application, along the circumference of the third through hole, the central angle α corresponding to the liquid outlet is not less than 50° and not greater than 270°.

[0070] 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.

[0071] According to some embodiments of this application, the blocking member is integrally formed with the first insulating member.

[0072] 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.

[0073] According to some embodiments of this application, the capacity of a single battery cell is greater than or equal to 500Ah.

[0074] The battery cell provided by the above solution has good pressure relief efficiency and high internal structural reliability. When the capacity of the battery cell is greater than or equal to 500Ah, it can relieve internal pressure in a timely manner. Under the condition of large internal pressure, it can reduce the risk of electrode damage caused by mutual interference between the electrode and the first insulating component to a certain extent. Therefore, it can improve the reliability of the battery device, especially the reliability of large-capacity battery cells.

[0075] 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 T1, the dimension of the outer shell in the second direction is W1, 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.

[0076] According to some embodiments of this application, the outer casing is a steel casing.

[0077] Secondly, some embodiments of this application also provide a battery device, which includes the battery cell provided in the first aspect.

[0078] 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.

[0079] 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

[0080] 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.

[0081] Figure 1 is a schematic diagram of the vehicle structure in some embodiments of this application;

[0082] Figure 2 is an exploded perspective view of the battery device in some embodiments of this application;

[0083] Figure 3 is a perspective view of a single battery cell in some embodiments of this application;

[0084] Figure 4 is an exploded perspective view of a battery cell in some embodiments of this application;

[0085] Figure 5 is an exploded perspective view of a partial structure of a battery cell in some embodiments of this application;

[0086] Figure 6 is a schematic diagram of the structure of the first insulating element in some embodiments of this application;

[0087] Figure 7 is an enlarged view of point A in Figure 6;

[0088] Figure 8 is a schematic diagram of the first insulating element in some embodiments of this application;

[0089] Figure 9 is a partial structural schematic diagram of the electrode assembly in some embodiments of this application;

[0090] Figure 10 is a schematic diagram of the first wall and the first insulating element in some embodiments of this application;

[0091] Figure 11 is a schematic diagram of the first insulating element in some embodiments of this application;

[0092] Figure 12 is a schematic diagram of the second boss in some embodiments of this application;

[0093] Figure 13 is a schematic diagram of the first insulating member and the blocking member in some embodiments of this application;

[0094] Figure 14 is a schematic diagram of the first insulating element in some embodiments of this application;

[0095] Figure 15 is a partial structural schematic diagram of the first insulating element in some embodiments of this application;

[0096] Figure 16 is a schematic diagram of a single battery cell in some embodiments of this application.

[0097] Icons: 1000 - Vehicle; 100 - Battery Unit; 200 - Controller; 300 - Motor; 20 - Housing; 21 - First Housing Body; 22 - Second Housing Body; 10 - Battery Cell; 11 - Housing; 110 - Shell; 111 - First Wall; 1110 - Injection Hole; 1111 - Sealing Member; 12 - Pressure Relief Mechanism; 13 - Electrode Terminal; 130 - Pressure Ring; 14 - Electrode Assembly; 140 - Electrode Sheet; 141 - Flat Area; 142 - Electrode Tab; 143 - Adapter; 15 - First Insulator; 150 - Insulator Body; 151 - First Boss; 1510 - First Surface; 151 1-First through hole; 1512-First groove; 152-Second boss; 1520-First receiving groove; 1521-First wall portion; 1522-Second wall portion; 1523-Third wall portion; 1524-First protrusion; 153-Third boss; 1530-Second receiving groove; 154-Second surface; 1540-Second through hole; 1541-Second groove; 155-Terminal through hole; 156-Third through hole; 16-Second insulating component; 17-Blocking component; 170-Liquid outlet; 171-Bottom wall; 172-Side wall; z-Thickness direction of the first wall; x-First direction; y-Second direction. Detailed Implementation

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] In this application, "multiple" means two or more (including two).

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.).

[0111] 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 battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may 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 iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM1), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM6), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0112] 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.

[0113] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0114] 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.).

[0115] 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.

[0116] 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.

[0117] 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.

[0118] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0119] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0127] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0128] 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.

[0129] 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.

[0130] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0131] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0132] In some implementations, the electrode assembly has a stacked structure.

[0133] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0134] 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.

[0135] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0136] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0137] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0138] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important 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, the reliability of the battery device must also be taken into account.

[0152] For a typical battery cell, it includes a casing, an electrode assembly, and a first insulating member. The first insulating member is disposed within the casing and located between the casing wall and the electrode assembly to insulate and isolate the casing wall and the electrode assembly. In related technologies, the casing wall is provided with a pressure relief mechanism to release pressure inside the battery cell. To allow the internal pressure of the battery cell to be released by the pressure relief mechanism, the first insulating member has a through hole corresponding to the pressure relief mechanism. However, during the assembly or use of the battery cell, there is a risk that the electrode plates of the electrode assembly may insert into this through hole, leading to damage to the electrode plate structure and affecting the reliability of the battery device.

[0153] Based on the above considerations, in order to improve the problem of electrode damage caused by inserting the electrode into the through hole corresponding to the pressure relief mechanism, this application provides a battery cell. The battery cell includes a housing, a pressure relief mechanism, an electrode assembly, and a first insulating member. The housing has a first wall. The pressure relief mechanism is disposed on the first wall. The electrode assembly is disposed inside the housing and includes an electrode with a flat area, which is stacked along a first direction. The first insulating member is disposed inside the housing and located between the first wall and the electrode assembly. The first insulating member includes a first boss with a first surface facing the electrode assembly. The first surface has a first through hole that penetrates the first insulating member along the thickness direction z of the first wall. The length direction of the first through hole intersects with a second direction, and the first direction, the second direction, and the thickness direction of the first wall are mutually perpendicular.

[0154] In the above scheme, the first insulating member includes a first boss, which can be used to limit the movement of the electrode assembly, making the internal structure of the battery cell stable and reliable, thus improving the reliability of the battery cell. By setting a first through hole in the first boss, on the one hand, it is convenient for the gas inside the battery cell to pass through the first insulating member 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 first through hole to intersect with the length direction of the electrode sheet located in the flat region can effectively reduce the risk of structural damage caused by the electrode sheet inserting into the first 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.

[0155] 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.

[0156] 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.

[0157] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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.

[0163] 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.

[0164] 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.

[0165] 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.

[0166] Each battery cell 10 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, cylinder, prism, or other shapes. For example, in Figure 3, the battery cell 10 has a cuboid structure.

[0167] This application provides a battery cell 10 in some embodiments. Please refer to Figures 3-9. 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 an exploded perspective view of a partial structure of the battery cell 10 in some embodiments of this application. Figure 6 is a structural schematic diagram of the first insulating member 15 in some embodiments of this application. Figure 7 is an enlarged view of point A in Figure 6. Figure 8 is a schematic diagram of the first insulating member 15 in some embodiments of this application. Figure 9 is a partial structural schematic diagram of the electrode assembly 14 in some embodiments of this application. In Figure 5, the pattern of the flat area 141 of a portion of the electrode sheet 140 of the electrode assembly 14 is illustrated by way of example.

[0168] The battery cell 10 includes a housing 11, a pressure relief mechanism 12, an electrode assembly 14, and a first insulating member 15. The housing 11 has a first wall 111. The pressure relief mechanism 12 is disposed on the first wall 111. The electrode assembly 14 is disposed within the housing 11 and includes electrode plates 140, each having a flat region 141, which are stacked along a first direction x. The first insulating member 15 is disposed within the housing 11 and located between the first wall 111 and the electrode assembly 14. The first insulating member 15 includes a first boss 151, which has a first surface 1510 facing the electrode assembly 14. The first surface 1510 has a first through hole 1511 extending through the first insulating member 15 along the thickness direction z of the first wall. The length direction of the first through hole 1511 intersects with the second direction y, and the first direction x, the second direction y, and the thickness direction z of the first wall are all perpendicular to each other.

[0169] In some embodiments, the outer casing 11 can also 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.

[0170] 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 14 and prevent, to some extent, electrolyte leakage. When the housing 11 is a non-sealed structure, it can still protect the electrode assembly 14, and a sealing bag may be included between the housing 11 and the electrode assembly 14. The sealing bag is used to encapsulate the electrode assembly 14 and the electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0171] 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 14 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.

[0172] 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.

[0173] 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.

[0174] When assembling the battery cell 10, the electrode assembly 14 can be placed into the housing 110 first, and an electrolyte, such as electrolyte solution, can be filled into the housing 110. Then, the end cap can be closed on the opening of the housing 110 to seal the opening. Alternatively, the electrode assembly 14 can be placed into the housing 110, the end cap can be closed on the opening of the housing 110, and then the electrolyte solution can be injected into the housing 11 through the injection hole 1110 on the wall of the housing 11.

[0175] 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 14. For example, if the electrode assembly 14 is a cylindrical structure, then the housing 110 can be a cylindrical structure; if the electrode assembly 14 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.

[0176] The pressure relief mechanism 12 is disposed on the first wall 111. The pressure relief mechanism 12 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.

[0177] Optionally, the pressure relief mechanism 12 and the housing 11 can be an integrally formed structure or separate structures. If the pressure relief mechanism 12 and the housing 11 are separate structures, the pressure relief mechanism 12 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 12 closes the pressure relief hole. Correspondingly, the pressure relief mechanism 12 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 12 and the housing 11 are an integrally formed structure, the pressure relief mechanism 12 is a region on the housing 11 with a weak structure, such as a region on the housing 11 with a groove.

[0178] Electrode assembly 14 is a component in battery cell 10 where electrochemical reactions occur. Electrode assembly 14 includes electrode 140 and separator (e.g., separator membrane). The structure of electrode assembly 14 can be various. For example, electrode assembly 14 can be a wound structure formed by winding positive electrode, separator and negative electrode, or a stacked structure formed by stacking positive electrode, separator and negative electrode.

[0179] Referring to Figure 9, the electrode 140 has a flat region 141, and the flat regions 141 of the positive electrode and the negative electrode are stacked along a first direction x. In some embodiments, the first direction x may also be a direction perpendicular to the large surface of the battery cell 10. In some embodiments, the direction in which the internal expansion of the battery cell 10 has the greatest impact is parallel to the first direction x. As shown in Figure 9, at the location of the electrode 140 in the flat region 141, the electrode 140 extends along a second direction y, and the first direction x, the second direction y, and the thickness direction z of the first wall are all perpendicular to each other.

[0180] For example, the separator is 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.

[0181] One end of the electrode assembly 14 has a tab 142, which is used to input or output the positive or negative electrode of the electrode assembly 14. The tab 142 is used to connect with the electrode terminal 13 to realize the electrical connection between the electrode assembly 14 and the electrode terminal 13. It should be noted that the tab 142 of the electrode assembly 14 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 142 is used to output the positive electrode of the electrode assembly 14, then the tab 142 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 142 is used to output the negative electrode of the electrode assembly 14, then the tab 142 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.

[0182] Optionally, the electrode assembly 14 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 14, which are stacked along their thickness direction. That is, the two electrode assemblies 14 are stacked along the thickness direction of the battery cell 10. Of course, in other embodiments, the electrode assembly 14 housed within the housing 11 can be one, three, four, five, six, seven, or eight, etc.

[0183] The electrode terminal 13 serves to output or input electrical energy of the battery cell 10. One end of the electrode terminal 13 is used to connect to the tab 142 of the electrode assembly 14, and the other end is used to connect to the busbar component to realize the input or output of electrical energy of the battery cell 10.

[0184] For example, the electrode terminal 13 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. Of course, in some embodiments, the electrode terminal 13 can also be a composite material, that is, the electrode terminal 13 is formed by connecting two different metal materials, such as by hot pressing or cold pressing.

[0185] The electrode terminal 13 can be disposed on the first wall 111 or on other walls of the housing 11.

[0186] Taking the electrode terminal 13 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 13 is inserted into the terminal hole along the thickness direction z of the first wall, so that part of the electrode terminal 13 is located in the terminal hole, so that the electrode terminal 13 can be connected to the electrode assembly 14 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.

[0187] The assembly relationship between the electrode terminal 13 and the first wall 111 is varied. For example, the electrode terminal 13 can be riveted to the first wall 111. For instance, the electrode terminal 13 may consist of two riveted parts that clamp the first wall 111. Alternatively, the electrode terminal 13 and the first wall 111 can be connected by other structural components. For example, the electrode terminal 13 may pass through a terminal hole, and the other structural component may be a pressure ring 130. The pressure ring 130 is welded to the first wall 111, and the pressure ring 130 and the first wall 111 together clamp a portion of the electrode terminal 13 in the thickness direction z of the first wall, thereby achieving the assembly of the electrode terminal 13.

[0188] Optionally, the electrode terminal 13 can be directly connected to the tab 142 of the electrode assembly 14, such as by welding or abutting, or it can be indirectly connected to the tab 142 of the electrode assembly 14 through other components. Similarly, the connection structure between the electrode terminal 13 and the busbar component can also be various, such as welding, abutting, or snap-fitting.

[0189] In some embodiments, as shown in FIG4, the battery cell 10 may further include an adapter 143 disposed within the housing 11. The adapter 143 connects the electrode terminal 13 and the tab 142 of the electrode assembly 14 to realize the electrical connection between the electrode assembly 14 and the electrode terminal 13.

[0190] The first insulating member 15 is an insulating structure disposed inside the housing 11 and located between the first wall 111 and the electrode assembly 14. The first insulating member 15 can be used to insulate and isolate the first wall 111 and the electrode assembly, and can also restrict the electrode assembly 14 from moving along the thickness direction z of the first wall. In some embodiments, the first insulating member 15 can be the lower plastic of the battery cell 10. Optionally, the material of the first insulating member 15 can be various, such as rubber, silicone, or plastic. Optionally, the electrode terminal 13 is disposed on the first wall 111, and the first insulating member 15 is provided with a terminal through-hole 155 through which the power supply terminal 13 passes.

[0191] Please refer to Figures 4-8. The first protrusion 151 is a portion of the first insulating member 15 that protrudes towards the electrode assembly 14. The first protrusion 151 has a first surface 1510 facing the electrode assembly 14. The shape of the first protrusion 151 can be square, circular, or other shapes. For example, the first protrusion 151 is a block-shaped structure, extending from one side of the first insulating member 15 to the other along the first direction x.

[0192] Optionally, the first insulating member 15 includes an insulating body 150 and a first boss 151. The side of the insulating body 150 facing away from the electrode assembly 14 can be connected to the inner side of the first wall 111, and the first boss 151 is formed on the side of the insulating body 150 facing the electrode assembly 14. The first boss 151 and the insulating body 150 can be integrally formed or separately disposed. When the first boss 151 and the insulating body 150 are separately disposed, their connection relationship includes, but is not limited to, bonding, welding, snap-fitting, or other connection methods.

[0193] In some embodiments, the first surface 1510 may be in direct contact with the electrode assembly 14. In other embodiments, there may be a gap between the first surface 1510 and the electrode assembly 14.

[0194] In some embodiments, the first boss 151 is located at the middle of the first insulating member 15. In other embodiments, the first boss 151 may be located at the end of the first insulating member 15.

[0195] The first through hole 1511 is a through hole structure formed on the first surface 1510 and extending through the entire first insulating member 15 along the thickness direction z of the first wall. The first through hole 1511 can connect the interior of the battery cell 10 and the pressure relief mechanism 12, so that the gas inside the battery cell 10 can flow through the first through hole 1511 to the pressure relief mechanism 12 and be discharged by the pressure relief mechanism 12.

[0196] Optionally, the position of the first through hole 1511 can correspond to the position of the pressure relief mechanism 12. For example, the pressure relief mechanism 12 is located in the middle of the first wall 111, and the position of the first through hole 1511 is located in the middle of the first insulating member 15, with the two corresponding to each other. Optionally, the position of the first through hole 1511 can not correspond to the position of the pressure relief mechanism 12. For example, the pressure relief mechanism 12 is located in the middle of the first wall 111, and the position of the first through hole 1511 is located at the edge of the first insulating member 15, with the two being offset from each other.

[0197] In some embodiments, the first through hole 1511 can be strip-shaped, flat, or other shapes with a relatively long dimension in one direction. The length direction of the first through hole 1511 is the direction in which the size of the first through hole 1511 is maximum. For example, the first through hole 1511 is a strip-shaped hole, and the dimension of the first through hole 1511 in the length direction is the maximum dimension of the first through hole 1511.

[0198] The phrase "the length direction of the first through hole 1511 intersects the second direction y" can be understood as the length direction of the first through hole 1511 intersecting the extension direction or length direction of the portion of the electrode 140 located in the flat region 141. Alternatively, it can be understood as the projection of the first through hole 1511 and the projection of the flat region 141 of the electrode 140 intersecting along the thickness direction z of the first wall, with the length directions of the projections of the first through hole 1511 and the flat region 141 of the electrode 140 being staggered and not parallel. Optionally, there may be an angle between the length direction of the first through hole 1511 and the second direction y, for example, this angle could be 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100°, or other angles.

[0199] In the above scheme, the first insulating member 15 includes a first protrusion 151, which can be used to limit the movement of the electrode assembly 14, making the internal structure of the battery cell 10 stable and reliable, and thus improving the reliability of the battery cell 10. By setting a first through hole 1511 in the first protrusion 151, on the one hand, it is convenient for the gas inside the battery cell 10 to pass through the first insulating member 15 and be discharged by the pressure relief mechanism 12, thereby reducing the risk of thermal runaway of the battery cell 10; on the other hand, setting the length direction of the first through hole 1511 to intersect with the length direction of the electrode 140 located in the flat region 141 can effectively reduce the risk of the electrode 140 being damaged due to insertion into the first through hole 1511, 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.

[0200] According to some embodiments of this application, the length direction of the first through hole 1511 is parallel to the first direction x.

[0201] The statement "the length direction of the first through hole 1511 is parallel to the first direction x" can be understood as follows: the length direction of the first through hole 1511 is perpendicular to the extension direction or length direction of the portion of the electrode 140 located in the flat region 141. Alternatively, it can be understood as follows: along the thickness direction z of the first wall, the projection of the first through hole 1511 overlaps with the projection of the flat region 141 of the electrode 140, and the length direction of the projection of the first through hole 1511 is perpendicular to the length direction of the projection of the flat region 141 of the electrode 140.

[0202] In the above scheme, the first direction x is the stacking direction of the electrode 140 in the flat region 141. This direction is perpendicular to the length direction of the electrode 140 in the flat region 141. In this regard, by making the length direction of the first through hole 1511 parallel to the first direction x, the first through hole 1511 and the electrode 140 corresponding to the first through hole 1511 can be arranged perpendicularly and staggered, which effectively reduces the risk of structural damage caused by the electrode 140 being inserted into the first through hole 1511, resulting in a short circuit inside the battery cell 10. This can improve the reliability of the battery cell 10, thereby making the battery device 100 highly reliable.

[0203] According to some embodiments of this application, the width of the first through hole 1511 is not less than 0.5 mm and not more than 5 mm.

[0204] The width direction of the first through hole 1511 is perpendicular to the length direction of the first through hole 1511, and the width of the first through hole 1511 is its dimension in the width direction. Referring to Figure 8, the width of the first through hole 1511 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.

[0205] Optionally, the width of the first through hole 1511 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.

[0206] In the above scheme, by setting the width of the first through hole 1511 to be no 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 12, which is beneficial to improving the reliability of the battery cell 10 and the battery device 100. By setting the width of the first through hole 1511 to be no more than 5 mm, the risk of damage to the electrode 140 caused by the insertion of the electrode 140 into the first through hole 1511 can be reduced, and the impact on the structural strength of the first insulating component 15 due to the excessive size of the first through hole 1511 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 first through hole 1511 to be no less than 0.5 mm and no 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.

[0207] According to some embodiments of this application, please refer to Figures 7 and 8. The number of first through holes 1511 is multiple, and the multiple first through holes 1511 are arranged in a rectangular array.

[0208] In some embodiments, the number of first through holes 1511 can be two, four, six, or more. The plurality of first through holes 1511 can be arranged in a rectangular array. For example, referring to FIG3, the length direction of the first through holes 1511 is parallel to the first direction x. Two first through holes 1511 spaced apart in the first direction x form a column, and the two columns of first through holes 1511 are spaced apart along the second direction y.

[0209] In the above scheme, on the one hand, by setting the number of first through holes 1511 to multiple, the efficiency of gas passing through the first insulating member 15 inside the battery cell 10 can be improved, so that it can be quickly discharged by the pressure relief mechanism 12; on the other hand, by setting the multiple first through holes 1511 to a rectangular array for discharge, the adjacent two first through holes 1511 are spaced apart, so as to reduce the risk of electrode plate 140 insertion, so that the electrode assembly 14 has high structural stability, which is conducive to improving the reliability of the battery cell 10, and thus conducive to improving the reliability of the battery device 100.

[0210] According to some embodiments of this application, please refer to FIG5, along the thickness direction z of the first wall, the projection of the pressure relief mechanism 12 on the first insulating member 15 at least partially covers the first through hole 1511.

[0211] In some embodiments, the location of the first through hole 1511 corresponds to the location of the pressure relief mechanism 12, that is, gas passing through the first through hole 1511 can act on the pressure relief mechanism 12 along the thickness direction z of the first wall and can be discharged by the pressure relief mechanism 12. Exemplarily, along the second direction y, the pressure relief mechanism 12 is disposed in the middle of the first wall 111, and the first boss 151 is disposed in the middle of the first insulating member 15, corresponding to the location of the pressure relief mechanism 12. Exemplarily, along the second direction y, the pressure relief mechanism 12 is disposed at the end of the first wall 111, and the first boss 151 is disposed at the end of the first insulating member 15, corresponding to the location of the pressure relief mechanism 12.

[0212] In the above scheme, the position of the first through hole 1511 corresponds to the position of the pressure relief mechanism 12, which enables the internal gas of the battery cell 10 to quickly pass through the first through hole 1511 and be discharged to the outside through the pressure relief mechanism 12, resulting in high pressure relief efficiency of the battery cell 10, thereby improving the reliability of the battery cell and thus improving the reliability of the battery device 100.

[0213] According to some embodiments of this application, please refer to FIG5, a first groove 1512 corresponding to the position of the first boss 151 is formed on the side of the first insulating member 15 away from the electrode assembly 14, and a first through hole 1511 is disposed on the bottom wall of the first groove 1512.

[0214] The inner side of the first insulating member 15 is disposed toward the electrode assembly 14, and the outer side of the first insulating member 15 is disposed toward the first wall 111. In some embodiments, the outer side of the first insulating member 15 is recessed to form a first groove 1512, and the inner side of the first insulating member 15 protrudes to form a first boss 151 corresponding to the position of the first groove 1512. A first through hole 1511 is formed on the bottom wall of the first groove 1512.

[0215] In some embodiments, the surface of the pressure relief mechanism 12 facing the electrode assembly 14 is spaced apart from the bottom wall of the first groove 1512.

[0216] In the above solution, by providing a first groove 1512 on the side of the first insulating member 15 away from the electrode assembly 14, and the position of the first groove 1512 corresponding to the position of the first boss 151, on the one hand, the pressure relief mechanism 12 can be avoided, reducing the interference of the pressure relief mechanism 12 on the first through hole 1511. On the other hand, a cavity can be formed between the pressure relief mechanism 12 and the first boss 151 to accommodate the gas passing through the first through hole 1511, thereby facilitating the pressure relief mechanism 12 to discharge the gas inside the battery cell 10, and thus improving the reliability of the battery device 100.

[0217] In some other embodiments of this application, the portion of the first insulating member 15 that is away from the electrode assembly 14 and corresponds to the first protrusion 151 can be a flat surface. That is, relative to the above embodiments, the side of the first insulating member 15 that is away from the electrode assembly 14 does not have a first groove 1512.

[0218] According to some embodiments of this application, referring to Figures 6 and 7, the first insulating member 15 has a second surface 154 facing the electrode assembly 14. Along the direction from the first wall 111 towards the electrode assembly 14, the first surface 1510 protrudes from the second surface 154, and the second surface 154 is provided with a second through hole 1540. In the thickness direction z of the first wall, the projection of the pressure relief mechanism 12 onto the first insulating member 15 at least partially covers the second through hole 1540.

[0219] Along the thickness direction z of the first wall, the first surface 1510 and the second surface 154 are located on the same side of the first insulating member 15 facing the electrode assembly 14, and the second surface 154 is farther away from the electrode assembly 14 relative to the first surface 1510. Optionally, in some embodiments, the first surface 1510 is in contact with the electrode assembly 14, while the second surface 154 is not in contact with the electrode assembly 14. Optionally, in some embodiments, the first surface 1510 is not in contact with the electrode assembly 14, and there is a gap between them; the second surface 154 is also not in contact with the electrode assembly 14, and the distance between the second surface 154 and the electrode assembly 14 is greater than the distance between the first surface 1510 and the electrode assembly 14.

[0220] Optionally, the second surface 154 can be the inner surface of the insulating body 150. Optionally, the second surface 154 can protrude from the inner surface of the insulating body 150.

[0221] The second through hole 1540 is a through hole structure formed on the second surface 154 and penetrating the first insulating member 15. The second through hole 1540 allows gas inside the battery cell 10 to pass through so that it can be discharged by the pressure relief mechanism 12.

[0222] The shape of the second through hole 1540 can be varied, including but not limited to circular, strip-shaped or other shapes.

[0223] The statement that "the projection of the pressure relief mechanism 12 on the first insulating member 15 at least partially covers the second through hole 1540" can be understood as meaning that, along the thickness direction z of the first wall, the location of the second through hole 1540 is directly opposite the location of the pressure relief mechanism 12. Exemplarily, in some embodiments, along the thickness direction z of the first wall, the projection of the pressure relief mechanism 12 onto the first insulating member 15 can cover the first through hole 1511 and the second through hole 1540, or the projection of the first insulating member 15 can cover a portion of the first through hole 1511 and a portion of the second through hole 1540.

[0224] In the above scheme, by setting the second through hole 1540, the path of gas inside the battery cell 10 through the first insulating member 15 and discharged by the pressure relief mechanism 12 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.

[0225] According to some embodiments of this application, the length direction of the second through hole 1540 intersects the length direction of the first through hole 1511.

[0226] In some embodiments, the second through hole 1540 has a length direction, and its dimension in the length direction is larger than its dimension in other directions. Optionally, the second through hole 1540 is an elongated hole.

[0227] The phrase "the length direction of the second through hole 1540 intersects the length direction of the first through hole 1511" can be understood as meaning that the length directions of the second through hole 1540 and the first through hole 1511 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.

[0228] In the above scheme, the second surface 154 is far away from the electrode assembly 14 relative to the first surface 1510. Therefore, the second surface 154 does not need to contact the electrode assembly 14 relative to the first surface 1510, thus reducing the risk of the electrode 140 being inserted into the second surface 154. By setting the length direction of the second through hole 1540 to intersect with the length direction of the first through hole 1511, the structural strength of the first insulating member 15 can be improved, and the risk of the first insulating member 15 being deformed by internal pressure and interfering with other structural components of the battery cell 10 can be reduced.

[0229] According to some embodiments of this application, the width of the second through hole 1540 is not less than 0.5 mm and not more than 5 mm.

[0230] The width direction of the second through hole 1540 is perpendicular to the length direction of the second through hole 1540, and the width of the second through hole 1540 is its dimension in the width direction. Referring to Figure 8, the width of the second through hole 1540 is W2, and the value of W2 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.

[0231] Optionally, the width of the second through hole 1540 is W2, and the value of W2 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.

[0232] In the above scheme, by setting the width of the second through hole 1540 to be no less than 0.5 mm, the gas inside the battery cell 10 can be discharged through the second through hole 1540 by the pressure relief mechanism 12, 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 1540 to be no more than 5 mm, the impact on the structural strength of the first insulating component caused by the excessive size of the second through hole 1540 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 1540 to be no less than 0.5 mm and no 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.

[0233] According to some embodiments of this application, please refer to Figures 7 and 8. The length direction of the first through hole 1511 is parallel to the first direction x, and the length direction of the second through hole 1540 is parallel to the second direction y.

[0234] The first direction x and the second direction y are perpendicular to each other. In some embodiments, the length direction of the first through hole 1511 and the length direction of the second through hole 1540 are perpendicular to each other, and the two can be arranged in a staggered manner.

[0235] In the above scheme, on the one hand, by making the length direction of the first through hole 1511 parallel to the first direction x, the first through hole 1511 and the corresponding electrode 140 can be arranged perpendicularly and staggered, which effectively reduces the risk of structural damage caused by the electrode 140 being inserted into the first through hole 1511, 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 second through hole 1540 to be parallel to the second direction y, that is, perpendicular to the length direction of the first through hole 1511, two kinds of through holes are formed in a cross pattern on the first insulating member 15, which can improve the overall strength of the first insulating member 15, making the internal structure of the battery cell 10 stable and conducive to improving the reliability of the battery device 100.

[0236] According to some embodiments of this application, please refer to FIG8, there are multiple second through holes 1540, and the multiple second through holes 1540 are distributed on both sides of the first boss 151 along the second direction y.

[0237] Optionally, in some embodiments, the second surface 154 is provided with two sets of second through holes 1540, the two sets of second through holes 1540 are respectively provided on both sides of the first boss 151 along the second direction y, each set of second through holes 1540 includes multiple second through holes 1540, and the multiple second through holes 1540 in each set can be spaced apart along the first direction x.

[0238] Optionally, in some embodiments, the second surface 154 is provided with two second through holes 1540, which are respectively provided on both sides of the first boss 151 along the second direction y.

[0239] In the above scheme, by arranging multiple second through holes 1540 on both sides of the first boss 151 along the second direction y, it can improve the pressure relief efficiency of the battery cell 10 on the one hand, and compensate for the strength loss of the first insulating component 15 caused by the setting of the first through hole 1511 on the other hand, so that the internal structure of the battery cell 10 is stable, thereby improving the reliability of the battery device 100.

[0240] According to some embodiments of this application, please refer to FIG5. A second groove 1541 is formed on the side of the first insulating member 15 away from the electrode assembly 14. On the projection plane perpendicular to the thickness direction z of the first wall, the orthographic projection of the second groove 1541 and the orthographic projection of the pressure relief mechanism 12 at least partially overlap. The first groove 1512 and the second through hole 1540 are both formed on the bottom wall of the second groove 1541.

[0241] In some embodiments, a second groove 1541 is formed on the outer side of the first insulating member 15, and both the first groove 1512 and the second through hole 1540 are formed on the bottom wall of the second groove 1541. Optionally, the shape of the second groove 1541 is diverse, including but not limited to circular, square or other shapes.

[0242] In some embodiments, on a projection plane perpendicular to the thickness direction z of the first wall, the orthographic projection of the second groove 1541 and the orthographic projection of the pressure relief mechanism 12 may completely overlap or partially overlap.

[0243] For example, the shape of the second groove 1541 may correspond to the outer contour of the pressure relief mechanism 12 so that the second groove 1541 has the function of avoiding the pressure relief mechanism 12.

[0244] Please refer to Figure 5. The first groove 1512 is located in the middle of the bottom wall of the second groove 1541. The bottom wall of the second groove 1541 is divided into two regions along the second direction y. Each region is provided with a second through hole 1540.

[0245] In the above solution, by providing a second groove 1541 on the side of the first insulating member 15 away from the electrode assembly 14, on the one hand, the pressure relief mechanism 12 can be avoided, reducing the interference of the pressure relief mechanism 12 on the first through hole 1511 and the second through hole 1540. On the other hand, a chamber can be formed between the pressure relief mechanism 12 and the first through hole 1511 and the second through hole 1540 to accommodate the gas passing through the first through hole 1511 and the second through hole 1540, thereby facilitating the pressure relief mechanism 12 to discharge the gas inside the battery cell 10, which in turn helps to improve the reliability of the battery device 100.

[0246] According to some embodiments of this application, please refer to FIG5. The first insulating member 15 further includes an insulating body 150 and a second protrusion 152. The first protrusion 151 and the second protrusion 152 are both formed on the side of the insulating body 150 facing the electrode assembly 14. The first protrusion 151 and the second protrusion 152 are arranged at intervals along the second direction y.

[0247] The second protrusion 152 is the portion of the first insulating member 15 that protrudes towards the electrode assembly 14, and the second protrusion 152 is disposed on the same side as the first protrusion 151. Optionally, the second protrusion can be square, circular, or other shapes.

[0248] Optionally, the first insulating member 15 includes an insulating body 150, a first boss 151, and a second boss 152. The side of the insulating body 150 facing away from the electrode assembly 14 can be connected to the inner side of the first wall 111. The first boss 151 and the second boss 152 are formed on the side of the insulating body 150 facing the electrode assembly 14. In some embodiments, the side of the second boss 152 facing the electrode assembly 14 can be in direct contact with the electrode assembly 14. In other embodiments, there can be a gap between the side of the second boss 152 facing the electrode assembly 14 and the electrode assembly 14.

[0249] In the above scheme, by setting a second protrusion 152 on one side of the first protrusion 151 along the second direction y, the movement of the electrode assembly 14 along the thickness direction z of the first wall can be effectively restricted, reducing the risk of the internal circuit of the battery cell 10 being disconnected, thereby improving the reliability of the battery cell 10 and further improving the reliability of the battery device 100.

[0250] According to some embodiments of this application, the first wall 111 is provided with a liquid injection hole 1110, and the insulating body 150 is provided with a third through hole 156 corresponding to the position of the liquid injection hole 1110. Along the second direction y, the third through hole 156 is located between the first boss 151 and the second boss 152.

[0251] In some embodiments, the first wall 111 is provided with an injection hole 1110, which is used to inject electrolyte, such as electrolyte solution, into the battery cell 10. In some embodiments, after injection, the injection hole 1110 can be sealed by a sealing member 1111, which may include a plastic nail, an aluminum nail, or other structural components.

[0252] The third through hole 156 is a through hole structure formed on the insulating body 150. The position of the third through hole 156 corresponds to the position of the liquid injection hole 1110. In fact, the third through hole 156 and the liquid injection hole 1110 are even coaxially arranged. The electrolyte injected through the liquid injection hole 1110 can enter the electrode assembly 14 through the third through hole 156.

[0253] In some embodiments, the third through hole 156 is located between the first boss 151 and the second boss 152.

[0254] In some other embodiments, the injection hole 1110 may be provided on other wall portions of the housing 110.

[0255] In the above solution, by providing a third through hole 156 on the insulating body 150, and the third through hole 156 being located between the first boss 151 and the second boss 152, on the one hand, the electrolyte can be injected through the injection hole 1110 and then enter the electrode assembly 14 through the third through hole 156; on the other hand, a space for containing electrolyte can be formed between the first boss 151 and the second boss 152, thereby improving the electrolyte injection speed and thus improving the manufacturing efficiency of the battery cell 10.

[0256] According to some embodiments of this application, please refer to FIG10, which is a schematic diagram of the first wall 111 and the first insulating member 15 in some embodiments of this application. Along the second direction y, a first receiving groove 1520 is provided on the side of the second boss 152 facing the first boss 151.

[0257] In some embodiments, the second direction y can be the length direction of the first wall 111, the first direction x can be the width direction of the first wall 111, and the dimension of the first wall 111 in its length direction is greater than the dimension of the first wall 111 in its width direction.

[0258] In some embodiments, "a first receiving groove 1520 is provided on the side of the second boss 152 facing the first boss 151 along the second direction y" can be understood as the first receiving groove 1520 being provided on the side of the second boss 152 facing the third through hole 156 to receive the electrolyte discharged from the third through hole 156.

[0259] In some embodiments, the second boss 152 protrudes from the insulating body 150, and the second boss 152 is provided with a first receiving groove 1520 on its side along the second direction y. The opening of the first receiving groove 1520 faces the first boss 151, and the first receiving groove 1520 can extend into the second boss 152 along the second direction y.

[0260] Optionally, a portion of the first receiving groove 1520 may extend into the insulating body 150 so that the first receiving groove 1520 can utilize the space where the insulating body 150 is located.

[0261] Optionally, along the thickness direction z of the first wall, the first receiving groove 1520 is flush with the surface of the insulating body 150 facing the electrode assembly 14, away from the surface of the electrode assembly 14.

[0262] Optionally, along the thickness direction z of the first wall, the first receiving groove 1520 is closer to the electrode assembly 14 than the surface of the insulating body 150 facing the electrode assembly 14, that is, the first receiving groove 1520 protrudes from the surface of the electrode assembly 14.

[0263] Optionally, the first receiving groove 1520 is a blind hole structure with an opening located on the side of the second boss 152 facing the first boss 151.

[0264] Optionally, the first receiving groove 1520 has two openings, one of which is located on the side of the second boss 152 facing the first boss 151, and the other opening is disposed towards the electrode assembly 14.

[0265] In the above scheme, by providing a first receiving groove 1520 on the side of the second protrusion 152 facing the first protrusion 151, the electrolyte injected through the injection hole 1110 and the third through hole 156 can be contained, thereby injecting more electrolyte into the battery cell 10 within a certain period of time, so as to improve the electrolyte injection efficiency and thus improve the manufacturing efficiency of the battery cell 10.

[0266] According to some embodiments of this application, along the second direction y, the first receiving groove 1520 does not penetrate the second boss 152.

[0267] Please refer to Figure 10. In some embodiments, the first receiving groove 1520 is a blind hole structure. One end of the first receiving groove 1520 along the second direction y is open and faces the first boss 151. The other end of the first receiving groove 1520 along the second direction y does not penetrate the second boss 152.

[0268] Optionally, along the first direction x, the first receiving groove 1520 does not penetrate both sides of the second boss 152.

[0269] Optionally, along the first direction x, the first receiving groove 1520 extends through at least one side of the second boss 152.

[0270] In the above scheme, the first receiving groove 1520 is a blind hole structure. The end of the first receiving groove 1520 that is away from the first boss 151 does not penetrate the second boss 152. This can reduce the loss of structural strength of the first insulating component 15 to a certain extent, which is beneficial to the structural reliability of the first insulating component 15, and thus beneficial to the improvement of the reliability of the battery cell 10.

[0271] According to some embodiments of this application, the first receiving groove 1520 is open along the thickness direction z of the first wall towards the side facing the electrode assembly 14.

[0272] Referring to Figure 10, in some embodiments, along the thickness direction z of the first wall, the first receiving groove 1520 penetrates the surface of the second boss 152 facing the electrode assembly 14, such that the first receiving groove 1520 is open on the side facing the electrode assembly 14. Optionally, the size of the opening of the first receiving groove 1520 on the side facing the electrode assembly 14 can be equal to or smaller than the size of the first receiving groove 1520. For example, the size of the portion of the first receiving groove 1520 open on the side facing the electrode assembly 14 along the first direction x is smaller than the size of the first receiving groove 1520 along the first direction x.

[0273] Optionally, a through hole can also be formed on the side of the first boss 151 facing the electrode assembly 14, and the through hole connects to the first receiving groove 1520.

[0274] In the above scheme, by setting the side of the first receiving tank 1520 facing the electrode assembly 14 to be open, it is possible for the electrolyte to enter the interior of the electrode assembly 14, so as to achieve high electrolyte injection efficiency and improve the manufacturing efficiency of the battery cell 10.

[0275] In some other embodiments, the side of the first receiving groove 1520 facing the electrode assembly 14 along the thickness direction z of the first wall can be closed, as shown in FIG6. In this embodiment, the opening of the first receiving groove 1520 is located on the side of the second boss 152 facing the first boss 151.

[0276] According to some embodiments of this application, please refer to FIG10. The number of first receiving slots 1520 is multiple, and the multiple first receiving slots 1520 are arranged at intervals along the first direction x.

[0277] In some embodiments, the second boss 152 is provided with a plurality of first receiving grooves 1520, for example, two, three, four or more first receiving grooves 1520 are provided. In these embodiments, the plurality of first receiving grooves 1520 are arranged at intervals along a first direction x, and the opening of each receiving groove can be provided facing the first boss 151.

[0278] For example, referring to Figure 10, the second boss 152 is provided with two first receiving grooves 1520. Both first receiving grooves 1520 are blind hole structures, and both are open on the side facing the electrode assembly 14. The two first receiving grooves 1520 are spaced apart along the first direction x, dividing the second boss 152 into multiple interconnected components, such as a first wall portion 1521, a second wall portion 1522, a third wall portion 1523, and a first protrusion 1524. The first wall portion 1521 and the second wall portion 1522 are spaced apart along the first direction x. The end of the first wall portion 1521 away from the first boss 151 and the end of the second wall portion 1522 away from the first boss 151 are connected by the third wall portion 1523. Along the first direction x, the first protrusion 1524 is located between the first wall portion 1521 and the second wall portion 1522.

[0279] In the above scheme, by setting up multiple first receiving tanks 1520 and arranging them at intervals along the first direction x, the electrolyte injected through the injection hole 1110 and the third through hole 156 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.

[0280] According to some embodiments of this application, please refer to Figures 10 and 11. Figure 11 is a schematic diagram of the first insulating member 15 in some embodiments of this application.

[0281] Along the first direction x, the second boss 152 includes a first wall portion 1521, a second wall portion 1522, a third wall portion 1523, and a first protrusion 1524. The first wall portion 1521 and the second wall portion 1522 are spaced apart along the first direction x. One end of the first wall portion 1521 away from the first boss 151 and one end of the second wall portion 1522 away from the first boss 151 are connected by the third wall portion 1523. Along the first direction x, the first protrusion 1524 is located between the first wall portion 1521 and the second wall portion 1522. Along the first direction x, the first protrusion 1524 and the first wall portion 1521 are spaced apart and form a first receiving groove 1520. The first protrusion 1524 and the second wall portion 1522 are spaced apart and form a first receiving groove 1520.

[0282] Optionally, there are two first receiving grooves 1520, which are spaced apart along a first direction x. A first protrusion 1524 is located between the two first receiving grooves 1520. Along the first direction x, one of the first receiving grooves 1520 has a first wall portion 1521 on the side opposite to the first protrusion 1524. The first wall portion 1521 can be connected to the edge of the insulating body 150. The other first receiving groove 1520 has a second wall portion 1522 on the side opposite to the first protrusion 1524. The second wall portion 1522 can be connected to the edge of the insulating body 150. Along the first direction x, the edge of the insulating body 150 has a third wall portion 1523. The two ends of the third wall portion 1523 along the second direction y are respectively connected to the first wall portion 1521 and the second wall portion 1522.

[0283] Optionally, the dimensions of the first wall portion 1521, the second wall portion 1522, and the first protrusion 1524 along the first direction x can be the same or different. For example, the dimensions of the first wall portion 1521 and the second wall portion 1522 along the first direction x can be small, while the dimension of the first protrusion 1524 along the first direction x can be large. That is, the first wall portion 1521 and the second wall portion 1522 can be in the form of a sheet, while the first protrusion 1524 can be in the form of a block.

[0284] Optionally, the thickness of the third wall portion 1523 may be the same as or different from the thickness of the first wall portion 1521 and the second wall portion 1522. For example, the thicknesses of the first wall portion 1521, the second wall portion 1522 and the third wall portion 1523 may be the same and all less than the thickness of the first protrusion 1524 along the second direction.

[0285] In the above scheme, the second boss 152 includes a first wall portion 1521, a second wall portion 1522, a third wall portion 1523, and a first protrusion 1524. A first receiving groove 1520 can be formed between the first wall portion 1521 and the first protrusion 1524, and another first receiving groove 1520 can be formed between the second wall portion 1522 and the first protrusion 1524. This can quickly accommodate the electrolyte injected through the injection hole 1110 and the third through hole 156, thereby meeting the requirement for a faster electrolyte injection speed, improving the injection efficiency, and thus improving the manufacturing efficiency of the battery cell 10.

[0286] According to some embodiments of this application, the battery cell 10 further includes a second insulating member 16, which at least partially encloses the electrode assembly 14, and the second insulating member 16 is connected to at least one of the outer side surface of the first wall portion 1521, the outer side surface of the second wall portion 1522, and the outer side surface of the third wall portion 1523.

[0287] Referring to Figure 4, the second insulating member 16 surrounds the outer periphery of the electrode assembly 14, providing insulation and protection. In some embodiments, the second insulating member 16 can be an insulating film, such as a Mylar film.

[0288] Along the direction of the electrode assembly 14 toward the first wall 111, the second insulating member 16 may extend beyond the side of the electrode assembly 14 facing the first wall 111. The portion of the second insulating member 16 extending beyond the electrode assembly 14 may be connected to the first insulating member 15. The connection relationship between the second insulating member 16 and the first insulating member 15 is diverse, including but not limited to welding, bonding, hot-melt connection, hot-press connection, etc.

[0289] Optionally, the portion of the second insulating member 16 extending beyond the electrode assembly 14 may be connected to at least a portion of the outer surfaces of the first boss 151 and the second boss 152 of the first insulating member 15. For example, the second insulating member 16 may be connected to at least one of the outer surfaces of the first wall portion 1521, the second wall portion 1522, and the third wall portion 1523. Exemplarily, the second insulating member 16 may be thermally fused to the outer surfaces of the first wall portion 1521 and the second wall portion 1522.

[0290] In the above scheme, by setting the second insulating element 16 to wrap the electrode assembly 14, the electrode assembly 14 can be protected and insulated, which can ensure the reliability of the electrode assembly 14 to a certain extent, reduce the risk of short circuit between the electrode assembly 14 and the outer casing 11, make the battery cell 10 highly reliable, and thus make the battery device 100 highly reliable.

[0291] According to some embodiments of this application, referring to FIG10, a first protrusion 1524 protrudes from the first wall portion 1521, the second wall portion 1522 and the third wall portion 1523 along the direction of the first wall 111 pointing to the electrode assembly 14.

[0292] In some embodiments, along the direction of the first wall 111 toward the electrode assembly 14, the first protrusion 1524 protrudes from the first wall portion 1521, the second wall portion 1522 and the third wall portion 1523. That is, the first protrusion 1524 is closer to the electrode assembly 14 than the first wall portion 1521, the second wall portion 1522 and the third wall portion 1523. For example, the first protrusion 1524 can contact the electrode assembly 14, while the first wall portion 1521, the second wall portion 1522 and the third wall portion 1523 do not contact the electrode assembly 14.

[0293] Optionally, along the direction from the first wall 111 to the electrode assembly 14, the dimensions of the first wall portion 1521 protruding from the insulating body 150, the dimensions of the second wall portion 1522 protruding from the insulating body 150, and the dimensions of the third wall portion 1523 protruding from the insulating body 150 can be the same or different. For example, the dimensions of the first wall portion 1521 protruding from the insulating body 150, the dimensions of the second wall portion 1522 protruding from the insulating body 150, and the dimensions of the third wall portion 1523 protruding from the insulating body 150 can be the same, or the dimensions of the first wall portion 1521 protruding from the insulating body 150 can be greater than the dimensions of the second wall portion 1522 protruding from the insulating body 150, and the dimensions of the second wall portion 1522 protruding from the insulating body 150 can be greater than the dimensions of the third wall portion 1523 protruding from the insulating body 150.

[0294] In the above solution, by setting the first protrusion 1524 to protrude from the first wall portion 1521, the second wall portion 1522, and the third wall portion 1523, on the one hand, the first protrusion 1524 can be used to restrict the movement of the electrode assembly 14, thereby stabilizing the internal structure and internal circuit of the battery cell 10. On the other hand, by keeping the first wall portion 1521, the second wall portion 1522, and the third wall portion 1523 away from the electrode assembly 14, the risk of damage to the electrode sheet 140 structure caused by the insertion of the first wall portion 1521, the second wall portion 1522, and the third wall portion into the electrode assembly 14 can be reduced, thereby making the battery cell 10 highly reliable.

[0295] According to some embodiments of this application, along the thickness direction z of the first wall, the side of the first wall portion 1521 facing the electrode assembly 14, the side of the second wall portion 1522 facing the electrode assembly 14, and the side of the third wall portion 1523 facing the electrode assembly 14 are flush with each other.

[0296] In some embodiments, the dimensions of the first wall portion 1521, the second wall portion 1522, and the third wall portion 1523 in the thickness direction z of the first wall can be the same, such that the first wall portion 1521, the second wall portion 1522, and the third wall portion 1523 are flush with each other on the side facing the electrode assembly 14.

[0297] In the above solution, by setting the side of the first wall portion 1521 facing the electrode assembly 14, the side of the second wall portion 1522 facing the electrode assembly 14, and the side of the third wall portion 1523 facing the electrode assembly 14 to be flush with each other, the structural consistency of the second boss 152 can be improved, the manufacturing difficulty of the first insulating member 15 can be reduced, and the manufacturing efficiency of the battery cell 10 can be improved.

[0298] According to some embodiments of this application, please refer to FIG12, which is a schematic diagram of the second protrusion 152 in some embodiments of this application. Along the direction from the first wall 111 to the electrode assembly 14, the first protrusion 1524 protrudes from the first wall portion 1521 by an amount not less than 0.2 mm and not more than 3 mm.

[0299] Along the direction from the first wall 111 toward the electrode assembly 14, the first protrusion 1524 protrudes beyond the first wall portion 1521 by a size 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.

[0300] 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.

[0301] In the above solution, by setting the size of the first protrusion 1524 protruding from the first wall portion 1521 to not less than 0.2 mm, the risk of damage to the electrode 140 caused by the insertion of the first wall portion 1521, the second wall portion 1522, and the third wall portion 1523 into the electrode assembly 14 can be effectively reduced; by setting the size of the first protrusion 1524 protruding from the first wall portion 1521 to not more than 3 mm, the space occupied by the first protrusion 1524 between the insulating body 150 and the electrode assembly 14 can be reduced, and the first wall portion 1521, the second wall portion 1522, and / or the third wall portion 1523 can have sufficient space to connect the second insulating member 16.

[0302] According to some embodiments of this application, please refer to FIG10. The first insulating member 15 further includes a third boss 153, which is formed on the side of the insulating body 150 facing the electrode assembly 14. The third boss 153, the first boss 151, and the second boss 152 are arranged sequentially at intervals along the second direction y. Along the second direction y, a second receiving groove 1530 is provided on the side of the third boss 153 facing the first boss 151.

[0303] The third protrusion 153 is the part of the first insulating member 15 that protrudes towards the electrode assembly 14. The third protrusion 153, the second protrusion 152 and the first protrusion 151 are disposed on the same side. Optionally, the third protrusion 153 can be square, circular or other shapes.

[0304] Optionally, the first insulating member 15 includes an insulating body 150, a first boss 151, a second boss 152, and a third boss 153. The side of the insulating body 150 facing away from the electrode assembly 14 can be connected to the inner side of the first wall 111. The first boss 151, the second boss 152, and the third boss 153 are formed on the side of the insulating body 150 facing the electrode assembly 14. The third boss 153, the first boss 151, and the second boss 152 are arranged sequentially at intervals along the second direction y. The third through hole 156 can be located on the side of the first boss 151 facing away from the third boss 153.

[0305] In some embodiments, the side of the third boss 153 facing the electrode assembly 14 may be in direct contact with the electrode assembly 14. In other embodiments, there may be a gap between the side of the third boss 153 facing the electrode assembly 14 and the electrode assembly 14.

[0306] In some embodiments, the structure of the third boss 153 may be similar to that of the second boss 152. The third boss 153 may be used to limit the movement of the electrode assembly 14 and may be used to connect with the second insulator 16.

[0307] In some embodiments, the third boss 153 is provided with a second receiving groove 1530 on the side facing the first boss 151, that is, facing the third through hole 156, to receive the electrolyte discharged from the third through hole 156.

[0308] Optionally, the third boss 153 protrudes from the insulating body 150, and the third boss 153 is provided with a second receiving groove 1530 on its side along the second direction y. The opening of the second receiving groove 1530 faces the first boss 151, and the second receiving groove 1530 can extend into the third boss 153 along the second direction y.

[0309] Optionally, a portion of the third receiving groove may extend into the insulating body 150 so that the second receiving groove 1530 can utilize the space where the insulating body 150 is located.

[0310] Optionally, along the thickness direction z of the first wall, the second receiving groove 1530 is flush with the surface of the insulating body 150 facing the electrode assembly 14, away from the surface of the electrode assembly 14.

[0311] Optionally, along the thickness direction z of the first wall, the second receiving groove 1530 is closer to the electrode assembly 14 than the surface of the insulating body 150 facing the electrode assembly 14, that is, the second receiving groove 1530 protrudes from the surface of the electrode assembly 14.

[0312] Optionally, the second receiving groove 1530 is a blind hole structure with an opening located on the side of the third boss 153 facing the first boss 151.

[0313] Optionally, the second receiving groove 1530 has two openings, one of which is located on the side of the third boss 153 facing the first boss 151, and the other opening is disposed towards the electrode assembly 14.

[0314] In the above scheme, by setting a third protrusion 153 on the side of the first protrusion 151 away from the second protrusion 152, it can restrict the movement of the electrode assembly 14. On the other hand, by setting a second receiving groove 1530 on the side of the third protrusion 153 facing the first protrusion 151, it can provide more space for the electrolyte, thereby improving the electrolyte injection efficiency and thus improving the manufacturing efficiency of the battery cell 10.

[0315] According to some embodiments of this application, please refer to FIG10, the width of the first receiving groove 1520 along the first direction x is greater than the width of the second receiving groove 1530 along the first direction x.

[0316] Along the second direction y, the first receiving groove 1520 is closer to the third through hole 156 than the second receiving groove 1530. The width of the first receiving groove 1520 along the first direction x can be understood as the total width of all the first receiving grooves 1520 along the first direction x. For example, when there are two first receiving grooves 1520, the "width of the first receiving groove 1520 along the first direction x" can be the sum of the widths of the two first receiving grooves 1520. Similarly, the width of the second receiving groove 1530 along the first direction x can be understood as the total width of all the second receiving grooves 1530 along the first direction x.

[0317] In the above scheme, the first receiving tank 1520 is closer to the electrolyte injection position than the second receiving tank 1530. To this end, by setting the width of the first receiving tank 1520 along the first direction x to be larger, it can more timely receive the electrolyte injected through the third through hole 156, 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.

[0318] Alternatively, in some other embodiments, the width of the first receiving groove 1520 along the first direction x may be equal to the width of the second receiving groove 1530 along the first direction x.

[0319] According to some embodiments of this application, please refer to FIG13, which is a schematic diagram of the first insulating member 15 and the blocking member 17 in some embodiments of this application. The first wall 111 is provided with a liquid injection hole 1110, and the first insulating member 15 is provided with a third through hole 156 corresponding to the position of the liquid injection hole 1110. The battery cell 10 also includes a blocking member 17, which is disposed on the side of the first insulating member 15 facing the electrode assembly 14, and the blocking member 17 is configured to at least partially block the third through hole 156.

[0320] The injection hole 1110 is a hole-like structure provided on the first wall 111, used to inject electrolyte, such as electrolyte solution, into the battery cell 10. The third through hole 156 is a hole-like structure formed on the insulating body 150. The third through hole 156 corresponds to the injection hole 1110. The two can be coaxially or eccentrically arranged. The third through hole 156 is used to guide the electrolyte injected through the injection hole 1110 to the side of the first insulating member 15 facing the electrode assembly 14, so that the electrolyte can flow to the electrode assembly 14.

[0321] The blocking member 17 is a structural member disposed on the side of the first insulating member 15 facing the electrode assembly 14, for example, the blocking member 17 is disposed on the inner side of the insulating body 150. The blocking member 17 can be sheet-shaped, cylindrical, or other capable of preventing the electrolyte from flowing directly to the electrode assembly 14 along the thickness direction z of the first wall.

[0322] For example, the blocking member 17 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 15, 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.

[0323] For example, the blocking member 17 can be a cylindrical structure, which includes a side wall 172 and a bottom wall 171. The side wall 172 is disposed around the edge of the third through hole 156 and the edge of the bottom wall 171, and an opening is made in the side wall 172 to allow the electrolyte to drain.

[0324] In the above scheme, by setting the blocking member 17 at the position corresponding to the third through hole 156, the electrolyte can be restricted from directly acting on the electrode assembly 14, reducing the risk of structural damage to the electrode assembly 14 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.

[0325] According to some embodiments of this application, the blocking member 17 is provided with a liquid outlet 170, the orientation of the liquid outlet 170 is perpendicular to the thickness direction z of the first wall, and the orientation of the liquid outlet 170 intersects with the first direction x.

[0326] The blocking member 17 has a liquid outlet 170 for guiding the electrolyte injected through the injection hole 1110 out. Exemplarily, after being injected through the injection hole 1110, the electrolyte enters the third through hole 156, and is then guided by the blocking member 17 to exit through the liquid outlet 170. The orientation of the liquid outlet 170 can be understood as the flow direction of the electrolyte when it enters between the first insulating member 15 and the electrode assembly 14.

[0327] In some embodiments, the orientation of the outlet 170 can be understood as the direction of the center line of the central angle corresponding to the outlet 170.

[0328] In some embodiments, the first direction x can be the width direction of the first wall 111, and the second direction y can be the length direction of the first wall 111. The space between the first insulating member 15 and the electrode assembly 14 is smaller in the first direction x and larger in the second direction y.

[0329] In the above scheme, the electrolyte is discharged from the outlet 170 of the blocking member 17. By setting the orientation of the outlet 170 to intersect with the first direction x, the electrolyte can be discharged to the side with a larger space between the first insulating member 15 and the electrode assembly 14, 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 manufacturing efficiency of the battery device 100.

[0330] According to some embodiments of this application, the outlet 170 is oriented parallel to the second direction y.

[0331] In some embodiments, the direction of the center line of the central angle corresponding to the outlet 170 is parallel to the second direction y, that is, the electrolyte is discharged from the outlet 170 and the direction of the electrolyte flow is in the second direction y, for example, the direction of the third through hole 156 is in the direction of the first boss 151.

[0332] In the above scheme, the second direction y can be the length direction of the first wall 111. In the second direction y, the space between the first insulating member 15 and the electrode assembly 14 is relatively large. Therefore, the liquid outlet 170 is set to face the second direction y, which can effectively improve the liquid injection efficiency of the electrolyte and improve the reliability of the battery device 100.

[0333] According to some embodiments of this application, the first insulating member 15 includes an insulating body 150, a first boss 151 formed on the side of the insulating body 150 facing the electrode assembly 14, a third through hole 156 and a blocking member 17 disposed on the insulating body 150, and an outlet 170 disposed facing the first boss 151.

[0334] The insulating body 150 is the main component of the first insulating member 15. The side of the insulating body 150 facing away from the electrode assembly 14 can be connected to the first wall 111. The connection between the insulating body 150 and the first wall 111 includes, but is not limited to, bonding, snap-fitting, threaded connection, or other connection methods. A first boss 151 and a blocking member 17 are formed on the side of the insulating body 150 facing the electrode assembly 14, and the first boss 151 and the blocking member 17 protrude from the insulating body 150. In some embodiments, the first boss 151 can contact the electrode assembly 14. In some embodiments, the side of the blocking member 17 facing away from the insulating body 150 can contact the electrode assembly 14, which can restrict the movement of the electrode assembly 14. In other embodiments, the side of the blocking member 17 facing away from the insulating body 150 can be spaced apart from the electrode assembly 14.

[0335] "The outlet 170 is oriented toward the first protrusion 151" can be understood as the outlet 170 being oriented parallel to the second direction y, and the electrolyte discharged from the outlet 170 being able to flow toward the first protrusion 151.

[0336] Please refer to Figure 14, which is a schematic diagram of the first insulating member 15 in some embodiments of this application. In Figure 14, the arrows indicate the direction of electrolyte flow. The electrolyte enters the blocking member 17 through the third through hole 156 and is discharged from the outlet 170 after being guided by the blocking member 17. The discharged electrolyte can flow along the second direction y to the first protrusion 1524, and can enter the second groove 1541 and the first groove 1512 through the second through hole 1540 of the first protrusion 1524. It can be divided into multiple streams of fluid, which flow to the electrode assembly 14 through the first through hole 1511 and to the electrode assembly 14 through the second through hole 1540 on the other side.

[0337] In the above scheme, by setting the outlet 170 toward the first protrusion 151, the electrolyte discharged from the outlet 170 can pass through the through hole on the first protrusion 151, 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.

[0338] Alternatively, in other embodiments, the outlet 170 is disposed along the second direction y, facing the side opposite to the first boss 151.

[0339] According to some embodiments of this application, along the second direction y, the first boss 151 is located at the middle of the first insulating member 15.

[0340] In some embodiments, the first boss 151 is located in the middle of the first insulating member 15, and the third through hole 156 is disposed eccentrically to the first insulating member 15. In these embodiments, the space of the liquid outlet 170 facing the first boss 151 is larger than the space of the side away from the first boss 151.

[0341] In the above solution, by setting the first protrusion 151 in the middle of the first insulating member 15, 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 15 and discharged through the pressure relief mechanism 12; on the other hand, it enables the liquid outlet 170 to face the side with a larger space between the first insulating member 15 and the electrode assembly 14, 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.

[0342] According to some embodiments of this application, please refer to FIG14. The blocking member 17 includes a bottom wall 171 and a side wall 172. Along the thickness direction z of the first wall, one end of the side wall 172 surrounds the third through hole 156, and the other end of the side wall 172 is connected to the bottom wall 171. The liquid outlet 170 is formed in the side wall 172.

[0343] In some embodiments, the blocking member 17 may have a cylindrical structure, including a sidewall 172 and a bottom wall 171. One end of the sidewall 172 surrounds the edge of the third through hole 156, and the other end of the sidewall 172 surrounds the edge of the bottom wall 171. Optionally, the shape of the third through hole 156 corresponds to the shape of the bottom wall 171. For example, if the third through hole 156 is a circular hole, then the bottom wall 171 is circular.

[0344] "The outlet 170 is formed on the side wall 172" can be understood as an opening in the side wall 172 to form the outlet 170, or the removal of part of the side wall 172 to form the outlet 170.

[0345] In the above scheme, the blocking member 17 has a simple structure. By blocking the bottom wall 171 and the side wall 172, the electrolyte can be restricted to be discharged only from the outlet 170, 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.

[0346] According to some embodiments of this application, please refer to Figure 15, which is a partial structural schematic diagram of the first insulating member 15 in some embodiments of this application. Along the circumference of the third through hole 156, the central angle α corresponding to the liquid outlet 170 is not less than 50° and not greater than 270°.

[0347] Along the circumference of the third through hole 156, the central angle α corresponding to the outlet 170 can be understood as the included angle between the two opposite wall surfaces of the outlet 170 along the circumference of the third through hole 156. The circumference of the third through hole 156 is the direction surrounding the axial direction of the third through hole 156.

[0348] As shown in Figure 15, the value of the central angle α corresponding to the liquid outlet 170 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.

[0349] In the above scheme, by setting the size of the central angle corresponding to the liquid outlet 170 to not less than 50°, the electrolyte can be discharged from the liquid outlet 170 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 170 to not more than 50°, the impact of setting the liquid outlet 170 on the structural strength of the blocking member 17 can be reduced.

[0350] According to some embodiments of this application, the blocking member 17 is integrally formed with the first insulating member 15.

[0351] In some embodiments, the blocking member 17 and the first insulating member 15 can be manufactured by an integral molding process, such as injection molding, hot melt molding or other integral molding processes.

[0352] In the above scheme, by making the blocking member 17 and the first insulating member 15 integrally formed, the structural strength of the first insulating member 15 and the blocking member 17 can be high, so as to adapt to higher injection pressure, thereby improving the injection efficiency.

[0353] In other embodiments, the blocking member 17 and the first insulating member 15 are separate structures, and are connected by bonding, welding, riveting, threaded connection or other connection relationships.

[0354] According to some embodiments of this application, the capacity of the battery cell 10 is greater than or equal to 500Ah.

[0355] 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.

[0356] 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.

[0357] The battery cell 10 provided by the above solution has good pressure relief efficiency and high internal structural reliability. When the capacity of the battery cell 10 is greater than or equal to 500Ah, it can timely relieve internal pressure. Under the condition of large internal pressure, it can reduce the risk of damage to the electrode 140 caused by mutual interference between the electrode 140 and the first insulating member 15. Therefore, it can improve the reliability of the battery device 100, especially the reliability of the large-capacity battery cell 10.

[0358] According to some embodiments of this application, please refer to FIG16, which is a schematic diagram of a battery cell 10 in some embodiments of this application.

[0359] The outer shell 11 is a square shell. The dimension of the outer shell 11 in the first direction x is T1, the dimension of the outer shell 11 in the second direction y is W1, 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.

[0360] The first direction x can be the thickness direction of the battery cell 10, the second direction y can be the width 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.

[0361] The statement “The outer casing 11 has a dimension of T1 in the first direction x, a dimension of W1 in the second direction y, 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.

[0362] 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.

[0363] 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.

[0364] 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.

[0365] 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.

[0366] 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.

[0367] According to some embodiments of this application, the outer casing 11 is a steel casing.

[0368] 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.

[0369] 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.

[0370] As shown in Figure 2, the battery device 100 may also include a housing 20, in which the battery cells 10 are housed.

[0371] 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.

[0372] 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.

[0373] 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.

[0374] 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.

[0375] 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.

[0376] 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.

[0377] 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.

[0378] 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.

[0379] According to some embodiments of this application, a battery cell 10 is provided, as shown in Figures 3-15.

[0380] The battery cell 10 can be a square battery cell, and includes a housing 11, an electrode assembly 14, electrode terminals 13, a pressure relief mechanism 12, and a first insulating member 15. The housing 11 may include a shell 110 and a first wall 111. The shell 110 has an opening, through which the electrode assembly 14 can be inserted. The first wall 111 is connected to the shell 110 and closes the opening, so that the electrode assembly 14 is in a closed space. There are two electrode terminals 13, and the two electrode terminals 13 have opposite polarities. One is a positive electrode and is electrically connected to the positive electrode tab of the electrode assembly 14, and the other is a negative electrode and is electrically connected to the negative electrode tab of the electrode assembly 14. The electrode plates 140 of the electrode assembly 14 have flat regions 141. The flat regions 141 of the positive electrode plate and the flat regions 141 of the negative electrode plate of the electrode assembly 14 are stacked along a first direction x. The first direction x, the second direction y, and the thickness direction z of the first wall are mutually perpendicular. The first direction x can be the thickness direction of the battery cell 10, the second direction y can be the width 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. The pressure relief mechanism 12 is disposed on the first wall 111 and is used to release the internal pressure of the battery cell 10.

[0381] The first insulating member 15 may be made of plastic. The first insulating member 15 is disposed inside the housing 11 and located between the first wall 111 and the electrode assembly 14. The first insulating member 15 may include an insulating body 150. The side of the insulating body 150 opposite to the electrode assembly 14 may be connected to the first wall 111. The insulating body 150 may have a terminal through hole 155 through which the power supply terminal 13 passes to connect with the corresponding electrode tab 142.

[0382] The first insulating member 15 has a first boss 151, a second boss 152, and a third boss 153 on the side facing the electrode assembly 14. Along the second direction y, the third boss 153, the first boss 151, and the second boss 152 are spaced apart on the inner side of the insulating body 150. The insulating body 150 is recessed towards one side of the electrode assembly 14 from the side facing away from the electrode assembly 14 to form a second groove 1541. The middle portion of the second groove 1541 is recessed towards one side of the electrode assembly 14 to form a first groove 1512. The insulating body 150 protrudes towards the electrode assembly 14 corresponding to the position of the first groove 1512 to form the first boss 151. The position of the second groove 1541 corresponds to the position of the pressure relief mechanism 12. The second groove 1541 can avoid the pressure relief mechanism 12, and there is a gap between the bottom wall of the second groove 1541 and the pressure relief mechanism 12.

[0383] Optionally, the first boss 151 is located in the middle of the first insulating member 15 to restrict the movement of the electrode assembly 14. The first boss 151 has a first surface 1510 facing the electrode assembly 14, and the first surface 1510 can contact the end face of the electrode assembly 14. The first boss 151 is provided with a first through hole 1511, which penetrates the first insulating member 15. The first through hole 1511 can be an elongated hole, and its length direction is parallel to the first direction x.

[0384] The bottom wall of the second groove 1541 is also provided with a second through hole 1540. There are multiple second through holes 1540, which are located on both sides of the first groove 1512 along the second direction y. The second through hole 1540 can be an elongated hole, and its length direction is parallel to the second direction y. That is, the length direction of the second through hole 1540 is perpendicular to the length direction of the first through hole 1511.

[0385] By providing a first through hole 1511 on the first protrusion 151, on the one hand, it facilitates the discharge of gas inside the battery cell 10 through the first insulating member 15 and the pressure relief mechanism 12, thereby reducing the risk of thermal runaway of the battery cell 10; on the other hand, by setting the length direction of the first through hole 1511 parallel to the first direction x, it can effectively reduce the risk of structural damage caused by the electrode 140 inserting into the first through hole 1511, 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 second through hole 1540 perpendicular to the first through hole 1511, the structural strength of the first insulating member 15 can be improved, enabling the first insulating member 15 to effectively perform its insulating and protective function.

[0386] In some embodiments, the first wall 111 is further provided with an injection hole 1110 for injecting electrolyte into the battery cell 10. The first insulating member 15 is provided with a third through hole 156 corresponding to the injection hole 1110. The third through hole 156 is formed on the insulating body 150 and is located between the first boss 151 and the second boss 152 along the second direction y.

[0387] In some embodiments, in order to increase the electrolyte containment space and improve the electrolyte injection efficiency, a first receiving groove 1520 is formed on the side of the second boss 152 facing the first boss 151, and a second receiving groove 1530 is formed on the side of the third boss 153 facing the second boss 152.

[0388] In some embodiments, the insulating body 150 is further provided with a blocking member 17 on the side facing the electrode assembly 14. The blocking member 17 is configured to at least partially block the third through hole 156 to guide the electrolyte from directly impacting the electrode assembly 14. Optionally, the blocking member 17 is provided with a liquid outlet 170, which is disposed facing the first boss 151.

[0389] In the above solution, by setting the outlet 170 toward the first protrusion 151, the electrolyte can flow to the side with a larger inner space of the first insulating member, and the electrolyte discharged from the outlet 170 can pass through the through hole on the first protrusion 151, 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.

[0390] 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 shell has a first wall; A pressure relief mechanism is installed on the first wall; An electrode assembly is disposed within the housing. The electrode assembly includes an electrode sheet, the electrode sheet having a flat region, and the flat region being stacked along a first direction. A first insulating member is disposed within the housing and located between the first wall and the electrode assembly. The first insulating member includes a first boss, the first boss having a first surface facing the electrode assembly, and the first surface having a first through hole that penetrates the first insulating member along the thickness direction of the first wall. The length direction of the first through hole intersects with the second direction, and the first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other.

2. The battery cell according to claim 1, wherein, The length direction of the first through hole is parallel to the first direction.

3. The battery cell according to claim 1 or 2, wherein, The width of the first through hole is not less than 0.5 mm and not more than 5 mm.

4. The battery cell according to any one of claims 1-3, wherein, The number of the first through holes is multiple, and the multiple first through holes are arranged in a rectangular array.

5. The battery cell according to any one of claims 1-4, 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 first through hole.

6. The battery cell according to claim 5, wherein, The first insulating member has a first groove on the side opposite to the electrode assembly that corresponds to the position of the first boss, and the first through hole is disposed on the bottom wall of the first groove.

7. The battery cell according to claim 6, wherein, The first insulating member has a second surface facing the electrode assembly, pointing in a direction along the first wall toward the electrode assembly, the first surface protruding from the second surface, and the second surface having a second through hole; 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.

8. The battery cell according to claim 7, wherein, The length direction of the second through hole intersects the length direction of the first through hole.

9. The battery cell according to claim 8, wherein, The width of the second through hole is not less than 0.5 mm and not more than 5 mm.

10. The battery cell according to claim 8 or 9, wherein, The length direction of the first through hole is parallel to the first direction, and the length direction of the second through hole is parallel to the second direction.

11. The battery cell according to any one of claims 7-10, wherein, The number of second through holes is multiple, and the multiple second through holes are distributed on both sides of the first boss along the second direction.

12. The battery cell according to claim 7, wherein, The first insulating member has a second groove formed on the side opposite to the electrode assembly. 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. Both the first groove and the second through hole are formed on the bottom wall of the second groove.

13. The battery cell according to any one of claims 1-12, wherein, The first insulating member further includes an insulating body and a second protrusion, both of which are formed on the side of the insulating body facing the electrode assembly, and are spaced apart along the second direction.

14. The battery cell according to claim 13, wherein, The first wall is provided with a liquid injection hole, and the insulating body is provided with a third through hole corresponding to the position of the liquid injection hole. Along the second direction, the third through hole is located between the first boss and the second boss.

15. The battery cell according to claim 14, wherein, Along the second direction, a first receiving groove is provided on the side of the second boss facing the first boss.

16. The battery cell according to claim 15, wherein, Along the second direction, the first receiving groove does not penetrate the second boss.

17. The battery cell according to claim 16, wherein, Along the thickness direction of the first wall, the first receiving groove opens toward one side of the electrode assembly.

18. The battery cell according to claim 17, wherein, The number of the first receiving slots is multiple, and the multiple first receiving slots are arranged at intervals along the first direction.

19. The battery cell according to claim 18, wherein, Along the first direction, the second 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 first direction. The end of the first wall portion away from the first boss and the end of the second wall portion away from the first boss are connected through the third wall portion. Along the first direction, the first protrusion is located between the first wall portion and the second wall portion. Along the first 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.

20. The battery cell according to claim 19, wherein, The battery cell further includes a second insulating member, which at least partially encloses the electrode assembly, and the second insulating member is connected to at least one of the outer side surface of the first wall portion, the outer side surface of the second wall portion, and the outer side surface of the third wall portion.

21. The battery cell according to claim 19 or 20, 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.

22. The battery cell according to claim 21, 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.

23. The battery cell according to claim 22, 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.

24. The battery cell according to any one of claims 15-23, wherein, The first insulating member further includes a third protrusion, which is formed on the side of the insulating body facing the electrode assembly, and the third protrusion, the first protrusion and the second protrusion are arranged at intervals along the second direction. Along the second direction, the third boss is provided with a second receiving groove on the side facing the first boss.

25. The battery cell according to claim 24, wherein, The width of the first receiving groove along the first direction is greater than the width of the second receiving groove along the first direction.

26. The battery cell according to any one of claims 1-25, wherein, The first wall is provided with a liquid injection hole, and the first insulating component is provided with a third through hole corresponding to the position of the liquid injection hole; The battery cell also includes a blocking member disposed on the side of the first insulating member facing the electrode assembly, and the blocking member is configured to at least partially block the third through hole.

27. The battery cell according to claim 26, 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 first direction.

28. The battery cell according to claim 27, wherein, The outlet is oriented parallel to the second direction.

29. The battery cell according to claim 27 or 28, wherein, The first insulating member includes an insulating body, the first boss is formed on the side of the insulating body facing the electrode assembly, the third through hole and the blocking member are disposed on the insulating body, and the liquid outlet is disposed facing the first boss.

30. The battery cell according to claim 29, wherein, Along the second direction, the first boss is located at the middle of the first insulating member.

31. The battery cell according to any one of claims 27-30, 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 third 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.

32. The battery cell according to any one of claims 27-31, wherein, Along the circumference of the third through hole, the central angle α corresponding to the liquid outlet is not less than 50° and not greater than 270°.

33. The battery cell according to any one of claims 26-32, wherein, The blocking component is integrally formed with the first insulating component.

34. The battery cell according to any one of claims 1-33, wherein, The capacity of the battery cell is greater than or equal to 500Ah.

35. The battery cell according to claim 34, wherein, The outer shell is a square shell. The dimension of the outer shell in the first direction is T1, the dimension of the outer shell in the second direction is W1, 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.

36. The battery cell according to any one of claims 1-35, wherein, The outer shell is made of steel.

37. A battery device, wherein, Includes the battery cell as described in any one of claims 1-36.

38. An electrical appliance, wherein, Includes the battery cell according to any one of claims 1-36, and / or the battery device according to claim 37, wherein the battery cell is used to provide electrical energy.

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