Battery cells, related devices, energy storage systems and charging networks

Abstract

This application relates to the field of battery technology, providing a battery cell, related devices, an energy storage system, and a charging network. The battery cell includes a housing, an electrode assembly, and a support member. The housing has a receiving cavity. The electrode assembly is disposed within the receiving cavity; the outer periphery of the electrode assembly includes two large surfaces and two corner surfaces. The two large surfaces are arranged opposite each other along a first direction, and the two corner surfaces are respectively located at opposite ends of the large surfaces along a second direction. The corner surfaces protrude away from the large surfaces along the second direction, and a tangent portion is provided between the corner surfaces and the large surfaces. A vertex portion is provided at the end of the corner surface away from the large surfaces along the second direction. The support member is disposed within the housing and is at least opposite to the area between the tangent portion and the vertex portion of the corner surface. In this way, during the expansion of the electrode assembly, the support member can at least abut against the area between the tangent portion and the vertex portion of the corner surface, reducing the tensile force generated at the tangent portion, thereby reducing the risk of cracking of the electrode sheets near the tangent portion.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and more specifically, relates to a battery cell, related devices, energy storage system and charging network. Background Technology

[0002] From a market perspective, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As the application areas of battery devices continue to expand, the market demand is also constantly increasing. Furthermore, the capacity of battery devices is becoming larger, and the performance requirements for battery devices are becoming increasingly stringent. These battery devices can be either power batteries or energy storage batteries.

[0003] In related technologies, a battery device includes one or more battery cells. Each battery cell includes a housing and an electrode assembly disposed within the housing; the electrode assembly is the component within the battery cell where electrochemical reactions occur. For a wound electrode assembly, the electrode plates are wound together. The electrode assembly is divided into a straight portion and two corner portions, with the two corner portions located on opposite sides of the straight portion.

[0004] During the charge-discharge cycle of a battery cell, the electrode plates of the electrode assembly will expand. Due to the winding characteristics of the electrode assembly, the electrode plates at the corners are at higher risk of cracking, which affects the service life of the battery cell.

[0005] The above statements are for the purpose of providing background information in relation to this application only and do not necessarily constitute prior art. Summary of the Invention

[0006] In view of the above problems, embodiments of this application provide a battery cell, related devices, energy storage system and charging network, which can reduce the risk of electrode cracking.

[0007] In a first aspect, embodiments of this application provide a single battery cell, comprising:

[0008] The shell has a receiving cavity;

[0009] An electrode assembly is disposed within a receiving cavity. The outer periphery of the electrode assembly includes two large surfaces and two corner surfaces. The two large surfaces are arranged opposite each other along a first direction. The two corner surfaces are respectively disposed at opposite ends of the large surfaces along a second direction. The corner surfaces are convex away from the large surfaces along the second direction. A tangent portion is provided between the corner surfaces and the large surfaces. A vertex portion is provided at the end of the corner surface away from the large surfaces along the second direction.

[0010] A support member is disposed within the housing and is disposed at least opposite to the area between the tangent point and the vertex of the corner surface. The support member is used to resist the expansion of the corner surface.

[0011] The housing includes two first walls arranged opposite each other along a first direction and two second walls arranged opposite each other along a second direction. The first walls and the second walls enclose a receiving cavity, and the support member is located at the corner formed by the connection of the first walls and the second walls.

[0012] The shell includes a first shell structure and two second shell structures respectively located at both ends of the first shell structure along a second direction. The first wall includes a first partition wall and two second partition walls respectively located at both ends of the first partition wall along a second direction. The first shell structure includes two first partition walls, and the second shell structure includes a second wall and two second partition walls respectively located at both ends of the second wall along a first direction. Support members are respectively connected to the second wall and the second partition walls, and the first and second partition walls are welded together. Alternatively, the shell includes two third shell structures distributed along a second direction. The first wall includes two third partition walls distributed along a second direction, and the third shell structure includes a second wall and two third partition walls respectively located at both ends of the second wall along a first direction. Support members are respectively connected to the second wall and the third partition walls, and the third partition walls of the two third shell structures are welded together. Alternatively, the shell includes two fourth shell structures distributed along a first direction. The second wall includes two fourth partition walls distributed along a first direction, and the fourth shell structure includes a first wall and two fourth partition walls respectively located at both ends of the first wall along a second direction. Support members are respectively connected to the first wall and the fourth partition walls, and the fourth partition walls of the two fourth shell structures are welded together.

[0013] The first direction and the second direction are perpendicular.

[0014] The battery cell provided in this application embodiment has a support member that is at least positioned opposite to the area between the tangent and vertex portions of the corner surface. The support member is used to resist the expansion of the corner surface, so that during the expansion of the electrode assembly, the support member can at least abut against the area between the tangent and vertex portions of the corner surface to resist the expansion force of the electrode at the corner surface and reduce the degree of expansion of the electrode at the corner surface. This reduces the tensile force generated at the tangent portion during expansion, thereby reducing the risk of cracking of the electrode near the tangent portion, that is, reducing the risk of cracking of the electrode at the corner portion of the electrode assembly.

[0015] In some embodiments, the number of electrode assemblies in a single battery cell is one, and the area between each corner surface and each tangent and vertex portion is disposed opposite to the support member.

[0016] Alternatively, the battery cell includes two electrode assemblies arranged along a first direction. Among the two tangent portions of each corner surface, the tangent portion farther away from the adjacent electrode assembly is the first tangent portion. The area between the first tangent portion and the vertex portion of each corner surface is arranged opposite to the support member.

[0017] Alternatively, the battery cell includes three or more electrode assemblies arranged along a first direction. Two electrode assemblies along the first direction that are close to the inner wall of the receiving cavity are the first electrode assemblies. In each first electrode assembly, the tangent portion of the two tangent portions of each corner surface that is far away from the adjacent electrode assembly is the first tangent portion. The area between the first tangent portion and the vertex portion of each corner surface is arranged opposite to the support member.

[0018] By adopting the above technical solution, in the electrode assembly (first electrode assembly) adjacent to the inner wall of the receiving cavity along the first direction, the corner surface of the electrode assembly is positioned opposite to the support member in the area between the tangent portion (first tangent portion) and the vertex portion adjacent to the inner wall of the receiving cavity along the first direction. Thus, during the expansion of the electrode assembly, after the large surface of the first electrode assembly expands in its flat portion and abuts against the inner wall of the receiving cavity, the support member can abut against the corner surface of the first electrode assembly in the area between the first tangent portion and the vertex portion. This prevents the electrode sheet at the corner portion of the first electrode assembly from expanding indefinitely under the resistance of the support member, thereby reducing the tensile force generated at the first tangent portion and lowering the risk of cracking of the electrode sheet near the first tangent portion.

[0019] In some embodiments, the two first walls and the two second walls are connected to form four corner positions, and each corner position is provided with a support member.

[0020] This configuration ensures that the corner surfaces of the battery cell, between the four first tangent points and the apex, are respectively positioned in a one-to-one correspondence with the support members at the four corner locations. This allows the expansion of the electrode sheets between the four first tangent points and the apex to be reduced by the resistance of the support members, thereby reducing the tensile force generated at the four first tangent points and lowering the risk of electrode sheet cracking near the first tangent points of the battery cell. This, in turn, reduces the risk of electrode sheet cracking at the corners of all electrode assemblies in the battery cell.

[0021] In some embodiments, the support members are connected to the first wall and the second wall, respectively.

[0022] This configuration allows the first wall, second wall, and support to roughly form a triangular structure, improving the structural strength of the support and thus its resistance to corner sections. This further reduces the expansion of the electrode near the first tangent point, thereby reducing the tensile force at the first tangent point and further minimizing the risk of cracking of the electrode near the first tangent point.

[0023] In some embodiments, the support member and the first wall form a first acute angle, and the support member and the second wall form a second acute angle.

[0024] By adopting the above technical solution, on the one hand, the first wall, the second wall, and the support member can form a triangular structure, thereby improving the support member's resistance to the area between the corner surface and the first tangent point and the vertex, thus reducing the risk of cracking of the electrode near the first tangent point. On the other hand, the area between the corner surface and the first tangent point and the vertex can be positioned opposite to the larger part of the support member, thus facilitating the support member to abut against the area between the corner surface and the first tangent point and the vertex after the corner portion expands, thereby further reducing the risk of cracking of the electrode near the first tangent point.

[0025] In some embodiments, the first acute angle is 30° to 45°, and / or the second acute angle is 30° to 45°.

[0026] By adopting the above technical solution, at least one of the first acute angle and the second acute angle has a suitable size. On the one hand, this improves the support member's resistance to the area between the corner surface and the first tangent point and the vertex. On the other hand, it facilitates the support member's contact with the area between the corner surface and the first tangent point and the vertex after the corner portion expands. This helps reduce the cracking problem of the electrode sheet near the first tangent point.

[0027] In some embodiments, the surface of the support member facing the corner is an arc-shaped surface that is recessed in a direction away from the corner.

[0028] Alternatively, the surface of the support member facing the corner is a plane.

[0029] This design allows the corner portion to abut against the support at a larger area between the first tangent point and the apex after expansion. This mitigates stress concentration at the corner where it abuts the support, thus reducing issues like electrode breakage and lithium plating caused by stress concentration. Alternatively, it simplifies the support structure, making it easier to manufacture.

[0030] In some embodiments, the support member is an arc-shaped structure recessed in a direction away from the corner surface;

[0031] Alternatively, the support member can be a flat plate structure with a straight extension.

[0032] This design allows the surface of the support member facing the corner to be a concave arc-shaped surface that moves away from the corner, thus mitigating stress concentration at the corner where it rests against the support member. Alternatively, it makes the support member's structure very simple and easy to manufacture.

[0033] In some embodiments, the surface of the support member facing the corner is an arcuate surface recessed in a direction away from the corner. The support member has a first end connected to a first wall and a second end connected to a second wall. The distance between the connecting line of the first end and the second end and the arcuate surface is less than or equal to 5 mm.

[0034] This design allows the curved surface of the support member facing the corner to have a suitable curvature, which facilitates a larger contact area between the corner surface and the support member after the corner expands. This enables the support member to further resist the expansion of the electrode near the first tangent point, and also further improves the stress concentration problem in the part of the corner surface that abuts against the support member.

[0035] In some embodiments, the support member has a first mounting groove and a second mounting groove at both ends, a first connecting part on the first wall and a second connecting part on the second wall, the first connecting part being installed in the first mounting groove and the second connecting part being installed in the second mounting groove.

[0036] This makes the assembly of the shell and support components very simple, easy to implement, and very reliable.

[0037] In some embodiments, the first mounting groove includes a first notch on the support member and a first slot in the first notch, the thickness of the first slot being greater than the thickness of the first notch; the first connecting portion includes a first transition portion and a first protrusion on the first transition portion, the thickness of the first protrusion being greater than the thickness of the first transition portion, the first protrusion engaging in the first slot, and the first transition portion abutting in the first notch;

[0038] And / or, the second mounting groove includes a second notch on the support and a second slot within the second notch, the thickness of the second slot being greater than the thickness of the second notch; the second connecting portion includes a second transition portion and a second protrusion on the second transition portion, the thickness of the second protrusion being greater than the thickness of the second transition portion, the second protrusion engaging within the second slot, and the second transition portion abutting within the second notch.

[0039] By adopting the above technical solution, the connection strength between the support and the shell can be improved, thereby increasing the support's resistance to corner surfaces and further reducing the risk of cracking of the electrode near the first cutting point.

[0040] In some embodiments, the support is adhered to the housing.

[0041] This design makes the assembly of the support and the housing very simple and easy to implement.

[0042] In some embodiments, the cavity includes a liquid storage space, and the side of the support member away from the corner surface is formed by the first wall and the second wall to create the liquid storage space.

[0043] The liquid storage space is formed by the side of the support away from the corner surface and the first and second walls, which makes the thickness of the support smaller. This makes it easier to reduce the material used in the support and to ensure the energy density of the battery cells to a certain extent.

[0044] In some embodiments, the support member is provided with a through hole communicating with the liquid storage space.

[0045] This design allows the electrolyte in the storage space to be replenished into the electrode assembly through the through-hole, which helps to improve the charge-discharge cycle performance of the battery cells.

[0046] In some embodiments, the support member is provided with a plurality of spaced-apart through holes.

[0047] By setting multiple through holes, the electrolyte in the storage space can be efficiently replenished into the electrode assembly, which helps to improve the charge-discharge cycle performance of the battery cells.

[0048] In some embodiments, the support member is provided with multiple rows of through holes spaced apart along a third direction, and the distance between two adjacent rows of through holes along the third direction is 10mm to 50mm; wherein, the third direction is perpendicular to the first direction and the second direction respectively.

[0049] This design serves two purposes. First, it provides the support with numerous through-holes, facilitating the replenishment of electrolyte into the electrode assembly. Second, it gives the support high structural strength, effectively resisting the expansion of the electrode near the first tangent point and thus reducing the risk of electrode cracking in that area.

[0050] In some embodiments, the diameter of the through hole is 1mm to 2mm.

[0051] This design allows the through-holes to have a suitable aperture. On one hand, it enables the electrolyte to be efficiently replenished into the electrode assembly through the through-holes, which helps improve the charge-discharge cycle performance of the battery cells. On the other hand, it gives the support component high structural strength, which can better resist the expansion of the electrode sheets near the first cutting point, thereby reducing the problem of electrode sheet cracking near the first cutting point.

[0052] In some embodiments, in the third direction, each end of the support member is not lower than the corner surface; wherein, the third direction is perpendicular to the first direction and the second direction, respectively.

[0053] This design ensures that after the corner expands, the corner surface can abut against the support at various points along the third direction, which further improves the reliability of the support against the corner surface and reduces the risk of electrode cracking near the first tangent point.

[0054] In some embodiments, the support member includes at least one of a metal structure and a plastic structure.

[0055] This design gives the support member high structural strength, providing strong resistance to expansion at the corner, and further reducing the problem of electrode cracking near the first cutting point.

[0056] Secondly, embodiments of this application provide a battery device, including a single battery cell.

[0057] The battery device provided in this application reduces the risk of electrode cracking at the corner of the electrode assembly by using the battery cells mentioned above, thereby improving the performance and lifespan of the battery cells and thus improving the performance and lifespan of the battery device.

[0058] Thirdly, embodiments of this application provide an electrical device, including a single battery cell or a battery device.

[0059] The electrical device provided in this application, by employing the aforementioned battery cells or battery devices, helps to improve the performance and lifespan of the electrical device.

[0060] Fourthly, embodiments of this application provide an energy storage device, including a single battery cell or a battery assembly.

[0061] The energy storage device provided in this application, by employing the aforementioned battery cells or battery devices, helps to improve the performance and lifespan of the energy storage device.

[0062] Fifthly, embodiments of this application provide an energy storage system, including an energy storage device.

[0063] The energy storage system provided in this application, by employing the energy storage devices mentioned above, helps to improve the performance and lifespan of the energy storage system.

[0064] Sixthly, embodiments of this application provide a charging network, including charging piles, and including an energy storage device or energy storage system, wherein the energy storage device is used to provide electrical energy to the charging piles.

[0065] The charging network provided in this application, by employing the energy storage device or energy storage system mentioned above, helps to improve the performance and lifespan of the charging network.

[0066] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0067] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0068] Figure 1 A schematic diagram of a vehicle provided for some embodiments of this application;

[0069] Figure 2 Exploded views of a battery device provided in some embodiments of this application;

[0070] Figure 3 A three-dimensional structural diagram of a battery cell provided in some embodiments of this application;

[0071] Figure 4 A three-dimensional structural diagram of the electrode assembly of a battery cell provided in some embodiments of this application;

[0072] Figure 5 for Figure 4 Top view of the provided electrode assembly;

[0073] Figure 6 This is a schematic diagram of the housing and electrode assembly of a battery cell provided in some embodiments of this application;

[0074] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0075] Figure 8 A perspective structural view of the housing and support of a battery cell provided in some embodiments of this application;

[0076] Figure 9 A partially enlarged schematic diagram of the casing and electrode assembly of a battery cell provided in some embodiments of this application;

[0077] Figure 10 Partial structural diagrams of the casing of a battery cell provided in some embodiments of this application;

[0078] Figure 11 for Figure 10 Enlarged view of point B in the middle;

[0079] Figure 12 A top view of a support member for a battery cell provided in some embodiments of this application;

[0080] Figure 13 A perspective structural view of the support member for a battery cell provided in some embodiments of this application;

[0081] Figure 14Exploded views of the housing and support of a battery cell provided in some embodiments of this application;

[0082] Figure 15 Exploded views of the housing and support of a battery cell provided in other embodiments of this application.

[0083] The following are the labeling elements in the figure:

[0084] 1000 - Vehicle; 100 - Battery device; 200 - Controller; 300 - Motor; 10 - Battery cell; 1 - Electrode assembly; 1a - First electrode assembly; 101 - Large surface; 102 - Corner surface; 103 - Cutting point; 103a - First cutting point; 104 - Vertex; 11 - Straight portion; 12 - Corner portion; 2 - Outer shell; 201 - Receiving cavity; 2011 - Liquid storage space; 21 - Shell; 211 - First wall; 2111 - First partition wall; 2112 - Second partition wall; 212 - Second wall; 2121 - Fourth partition wall; 213 - First connecting portion; 2131 - First transition portion; 2132 - 214-Second connecting part; 2141-Second transition part; 2142-Second protrusion; 22-End cap; 3-Support member; 301-First end; 302-Second end; 303-First mounting groove; 3031-First notch; 3032-First slot; 304-Second mounting groove; 3041-Second notch; 3042-Second slot; 305-Through hole; 20-Box body; 210-First part; 220-Second part; E-First shell structure; F-Second shell structure; C-Fourth shell structure; β1-First acute angle; β2-Second acute angle; Y-First direction; X-Second direction; Z-Third direction. Detailed Implementation

[0085] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0086] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0087] Unless otherwise specified, all technical features and optional technical features of the embodiments of this application can be combined with each other to form new technical solutions.

[0088] In the description of the embodiments of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0089] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0090] In the description of the embodiments of this application, "multiple" means two or more, and unless otherwise explicitly specified, "two or more" includes two. Correspondingly, "multiple groups" means two or more groups, including two groups.

[0091] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0092] In the description of 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 three possibilities: A exists, A and B exist simultaneously, and B exists. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0093] In the description of the embodiments in this application, unless otherwise expressly specified and limited, the technical term "adjacent" refers to proximity in location. For example, among three components A1, A2, and B, if the distance between A1 and B is greater than the distance between A2 and B, then A2 is closer to B than A1, meaning A2 is adjacent to B. Similarly, when there are multiple components C, namely C1, C2...CN, if one component C, such as C2, is closer to component B than the other components C, then C2 is adjacent to B.

[0094] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0095] From a market perspective, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As the application areas of battery devices continue to expand, the market demand is also constantly increasing. Furthermore, the capacity of battery devices is becoming larger, and the performance requirements for battery devices are becoming increasingly stringent. These battery devices can be either power batteries or energy storage batteries.

[0096] In related technologies, a battery device includes one or more battery cells. Each battery cell includes a housing and an electrode assembly disposed within the housing; the electrode assembly is the component within the battery cell where electrochemical reactions occur. For a wound electrode assembly, the electrode plates are wound together. The electrode assembly is divided into a straight portion and two corner portions, with the two corner portions located on opposite sides of the straight portion.

[0097] During the charge-discharge cycle of a battery cell, the electrode plates of the electrode assembly will expand. Due to the winding characteristics of the electrode assembly, the electrode plates at the corners are at higher risk of cracking, which affects the service life of the battery cell.

[0098] Specifically, during the expansion process of the electrode assembly, both the straight and corner portions of the electrode expand, but the force directions of the corner and straight portions during expansion are different. The electrode in the straight portion contacts the housing first during expansion, and the expansion is slowed down by the housing. The corner portion continues to expand, creating tensile force in the area between the straight and corner portions, leading to cracking of the electrode near this area.

[0099] In some cases, a reinforcing layer can be placed near the area between the straight and corner portions of the electrode to mitigate cracking. However, the addition of a reinforcing layer results in poorer uniformity of the electrode assembly.

[0100] In other cases, a buffer pad can be placed inside the casing to improve the stress on the corners and reduce the risk of electrode cracking. However, this increases the group margin of the battery cells, which increases the cyclic expansion force of the battery cells and can easily cause problems such as casing cracking and electrolyte leakage.

[0101] Based on the above considerations, embodiments of this application provide a battery cell, related devices, an energy storage system, and a charging network. A support member is disposed at least opposite to the area between the tangent and apex of the corner surface, and the support member is used to resist the expansion of the corner surface. This ensures that during the expansion of the electrode assembly, the support member can at least abut against the area between the tangent and apex of the corner surface to resist the expansion force of the electrode at the corner surface, reducing the degree of expansion of the electrode at the corner surface. This reduces the tensile force generated at the tangent during expansion, thereby reducing the risk of cracking of the electrode near the tangent, i.e., reducing the risk of cracking of the electrode at the corner of the electrode assembly.

[0102] It should be noted that the relevant devices may include battery devices, power-consuming devices, and energy storage devices.

[0103] The battery cell involved in the embodiments of this application refers to the smallest unit used for storing and outputting electrical energy. The battery cell can be a secondary battery or a primary battery. A secondary battery is a battery cell that can be recharged after discharge to activate the active materials and continue to be used.

[0104] The battery cells can be cylindrical, flat, cuboid, or other shapes. Battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0105] The battery device involved in the embodiments of this application can be a single physical module comprising one or more battery cells, used to provide voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel, or in a mixed connection via a busbar. A mixed connection refers to multiple battery cells being connected in both series and parallel configurations.

[0106] In some embodiments, the battery device can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. As an example, multiple battery cells can be fixed to form a battery module by cable ties or the like. As an example, multiple battery cells can also be fixed to form a battery module by end plates, side plates, or the like.

[0107] In some embodiments, the battery device can be a battery pack, which may include a housing and individual battery cells. As an example, individual battery cells may be directly housed within the housing. As another example, multiple individual battery cells may first be assembled into one or more battery modules and then housed within the housing.

[0108] The battery cells and battery devices involved in the embodiments of this application can be used in energy storage devices that use battery cells or battery devices as energy storage elements.

[0109] The energy storage device involved in the embodiments of this application can be an energy storage container or an energy storage cabinet.

[0110] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, energy storage devices can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours.

[0111] The energy storage device may include one or more battery clusters, and each battery cluster may include multiple battery devices. Within a battery cluster, multiple battery devices can be connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, these clusters can be connected in parallel to increase the capacity of the energy storage device.

[0112] In some embodiments, the energy storage device may further include a cabinet in which the battery clusters are housed.

[0113] In some embodiments, the energy storage device may further include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0114] In some embodiments, the thermal management module may include a liquid cooling unit that provides coolant to each battery device via piping for regulating the temperature of individual battery cells.

[0115] In some embodiments, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For example, the main control module can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0116] In some embodiments, the central control module can serve as the battery management unit of the energy storage device, used for monitoring and managing the energy storage device. The central control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device. For example, the central control module can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0117] In some embodiments, the fire protection module may include a control panel, detectors, alarm devices, etc., for detecting, alarming, or extinguishing fires in the energy storage device.

[0118] In some embodiments, the power distribution module can be used to distribute power to modules in the energy storage device that require electricity.

[0119] The energy storage system involved in the embodiments of this application can be any power system that requires energy storage devices.

[0120] In some embodiments, the energy storage system according to this application may include energy storage devices. The energy storage system may be connected to a power grid or microgrid; or, the energy storage system may be coupled to power generation equipment; or, the energy storage system may be connected to electrical consumption equipment. The number of energy storage devices may be one or more.

[0121] The charging network involved in this application embodiment may include charging piles and energy storage devices. The charging piles are electrically connected to the energy storage devices, and the energy storage devices are used to provide power to the charging piles.

[0122] The charging pile and the battery device in the energy storage device can be electrically connected via cables, and the battery device can provide the electrical energy stored in it to the charging pile.

[0123] The charging pile may have one or more connectors for connecting to electrical devices (such as vehicles) so that it can provide power to the devices.

[0124] The energy storage device can be located inside the charging pile (e.g., an integrated energy storage and charging unit) or outside the charging pile.

[0125] The battery cell and battery device provided in this application embodiment can also be used in electrical devices that use the battery cell or battery device as a power source.

[0126] Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, vehicles, 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. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. Based on the power source, vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Based on the drive method, vehicles can be front-wheel drive vehicles, rear-wheel drive vehicles, or four-wheel drive vehicles.

[0127] For ease of description, this application uses a vehicle as an example to illustrate the embodiments of the electrical device.

[0128] In some embodiments, please refer to Figure 1 , Figure 1 This is a schematic diagram of a vehicle 1000 provided in some embodiments of this application. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 may 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, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0129] In some embodiments, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0130] In some embodiments, please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 may include a housing 20 and a battery cell 10. The housing 20 is a structure with an internal space for accommodating the battery cell 10.

[0131] The housing 20 can adopt various structures. In some embodiments, the housing 20 may include a first portion 210 and a second portion 220, which overlap each other and together define the internal space of the housing 20, which is a closed space. Here, "closed" means covered or shut off; it can be sealed or unsealed. That is, the housing 20 can be a sealed structure or an unsealed structure. See [link to relevant documentation] for details. Figure 2Both the first part 210 and the second part 220 can be hollow structures with an opening at one end. The open side of the first part 210 covers the open side of the second part 220, so that the first part 210 and the second part 220 together define the internal space of the box 20. Alternatively, the first part 210 can be a hollow structure with an opening at one end, and the second part 220 is a plate-like structure. The second part 220 covers the open side of the first part 210, so that the first part 210 and the second part 220 together define the internal space of the box 20. The box 20 composed of the first part 210 and the second part 220 can be of various shapes, such as a cylinder, a cuboid, etc.

[0132] In some embodiments, multiple battery cells 10 can be connected in series, parallel, or mixed to form a whole, and then the whole formed by the multiple battery cells 10 is directly housed in the internal space of the housing 20. In other embodiments, multiple battery cells 10 can also be connected in series, parallel, or mixed to form a battery module, and the battery module is housed in the internal space of the housing 20. In still other embodiments, multiple battery cells 10 can also be connected in series, parallel, or mixed to form multiple battery modules, and the multiple battery modules can then be connected in series, parallel, or mixed to form a whole, and housed in the internal space of the housing 20.

[0133] In some embodiments, please combine Figure 1 and Figure 2 The housing 20 of the battery pack 100 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.

[0134] In some embodiments, please refer to the following: Figure 3 and Figure 4 And in conjunction with other accompanying figures. Figure 3 This is a perspective structural diagram of a battery cell 10 provided in some embodiments of this application. Figure 4 This is a perspective structural diagram of the electrode assembly 1 of a battery cell 10 provided in some embodiments of this application. The battery cell 10 provided in the embodiments of this application may include the electrode assembly 1 and the housing 2.

[0135] Electrode assembly 1 is the component in the battery cell 10 where the electrochemical reaction occurs. Electrode assembly 1 is mainly formed by winding or stacking positive and negative electrode sheets, with a separator between them. The portions of the positive and negative electrode sheets containing active material constitute the main body of electrode assembly 1, while the portions without active material each constitute a tab. The tab of the positive electrode sheet is called the positive tab, and the tab of the negative electrode sheet is called the negative tab. The positive and negative tabs can be located together at one end of the main body; alternatively, they can be located at opposite ends of the main body.

[0136] In a single battery cell 10, the number of electrode components 1 can be one; the number of electrode components 1 can also be multiple, such as... Figure 4 As shown.

[0137] In some embodiments, the battery cell 10 may further include an electrolyte, which acts as a conductor of ions between the positive and negative electrode plates. The electrolyte described in this application embodiment may be liquid, gel-like, or solid.

[0138] The housing 2 is used to define the internal environment of the battery cell 10 and to house the electrode assembly 1 and the electrolyte.

[0139] In some embodiments, please refer to Figure 3 And in conjunction with other figures. The housing 2 may include a housing 21 and an end cap 22, which are components used to jointly define the internal environment of the battery cell 10. The internal environment defined by the housing 21 and the end cap 22 is used to accommodate the electrode assembly 1 and the electrolyte.

[0140] In some implementations, the housing 21 and end cap 22 can be independent components. Specifically, the housing 21 has an opening, and the end cap 22 is placed over the opening of the housing 21 to jointly define the internal environment of the battery cell 10 and isolate the internal environment of the battery cell 10 from the external environment. In other implementations, the housing 21 and end cap 22 can also be an integrated structure. Specifically, the end cap 22 and the housing 21 can form a common connection surface before the electrode assembly 1 is inserted into the housing. After the electrode assembly 1 is inserted into the housing, when it is necessary to encapsulate the electrode assembly 1, the end cap 22 is then placed over the housing 21. For example, when the battery cell 10 is a pouch battery, the housing 21 and end cap 22 of the battery cell 10 can be formed by punching indentations in the aluminum-plastic film. Then, the electrode assembly 1 is inserted into the internal environment formed by the punching indentations in the aluminum-plastic film, and the opening of the aluminum-plastic film is fixed by sealing methods such as side sealing and top sealing. Of course, the battery cell 10 is not limited to a pouch battery, and the material of the housing 21 and end cap 22 is not limited to aluminum-plastic film.

[0141] The outer casing 2 can be either a sealed or unsealed structure. As an example, when the outer casing 2 is a sealed structure, it protects the electrode assembly 1 and, to some extent, prevents leakage such as electrolyte leakage. As an example, when the outer casing 2 is an unsealed structure, it still protects the electrode assembly 1, and a sealing bag may be included between the outer casing 2 and the electrode assembly 1 to encapsulate the electrode assembly 1 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating structure, an aluminum-plastic film, etc.

[0142] Among them, such as Figure 3 As shown, there can be one end cap 22, which is located at one end of the housing 21. Alternatively, there can be two end caps 22, which are located at opposite ends of the housing 21.

[0143] The housing 21 can be cylindrical, square, or other shapes, depending on the specific shape and size of the electrode assembly. The housing 21 and end cap 22 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic.

[0144] Please refer to the following: Figures 4 to 8 And in conjunction with other accompanying figures. Figure 4 This is a perspective structural diagram of the electrode assembly 1 of the battery cell 10 provided in some embodiments of this application. Figure 5 for Figure 4 Top view of electrode assembly 1 provided. Figure 6 This is a schematic diagram of the housing 21 and electrode assembly 1 of the battery cell 10 provided in some embodiments of this application. Figure 7 for Figure 6 Enlarged view of point A in the middle. Figure 8 This is a perspective view of the housing 21 and support member 3 of the battery cell 10 provided in some embodiments of this application. Figure 5 and Figure 6 In the diagram, the corner portion 12 and the straight portion 11 of the electrode assembly 1 are separated by dashed lines. Figure 8In the diagram, the obscured portion is indicated by dashed lines. The battery cell 10 provided in this embodiment includes a housing 21, an electrode assembly 1, and a support member 3. The housing 21 has a receiving cavity 201, within which the electrode assembly 1 is disposed. The outer periphery of the electrode assembly 1 includes two large surfaces 101 and two corner surfaces 102. The two large surfaces 101 are arranged opposite each other along a first direction Y, and the two corner surfaces 102 are respectively located at opposite ends of the large surfaces 101 along a second direction X. The corner surfaces 102 protrude away from the large surfaces 101 along the second direction X. A tangent portion 103 is provided between the corner surfaces 102 and the large surfaces 101, and a vertex portion 104 is provided at the end of the corner surface 102 away from the large surfaces 101 along the second direction X. The support member 3 is disposed within the housing 21, and is at least opposite to the area of ​​the corner surface 102 between the tangent portion 103 and the vertex portion 104. The support member 3 is used to resist the expansion of the corner surface 102. Among them, the first direction Y is perpendicular to the second direction X.

[0145] The receiving cavity 201 is a cavity formed inside the housing 21 to accommodate the electrode assembly 1.

[0146] Electrode assembly 1 may include a plurality of electrodes, at least some of which are wound together. Understandably, the plurality of electrodes are stacked and wound together; or, of the plurality of electrodes, a first portion 210 is stacked together, a second portion 220 is stacked and wound together, and the second portion 220 is wound around the outer periphery of the first portion 210.

[0147] Multiple electrodes include at least one positive electrode and at least one negative electrode, with a separator disposed between the positive and negative electrodes. The electrode assembly 1 can be sequentially stacked and wound in the order of positive electrode, separator, negative electrode, separator, or negative electrode, separator, positive electrode, separator. After the positive electrode, negative electrode, and separator are stacked and wound in a preset order, a flat, multi-turn wound body is formed. The flat, multi-turn wound body can be divided into a straight portion 11 and two corner portions 12, with the two corner portions 12 located at opposite ends of the straight portion 11 along the second direction X. The electrodes in the straight portion 11 extend in a generally straight manner, while the electrodes in the corner portions 12 extend in a curved manner.

[0148] The outer periphery of electrode assembly 1 refers to the outer surface of electrode assembly 1 extending along the winding direction of the electrode sheet, specifically surrounding the outside of electrode assembly 1. The outer periphery of electrode assembly 1 is generally parallel to the winding axis of electrode assembly 1, specifically approximately parallel to the third direction Z as described below. The outer periphery of electrode assembly 1 includes the outer surface of the corner portion 12 and the outer surface of the straight portion 11. Specifically, the two large surfaces 101 are the two outer surfaces of the straight portion 11 along the first direction Y, and the two corner surfaces 102 are the outer surfaces of the two corner portions 12 facing the housing 21. Understandably, the two large surfaces 101 and the two corner surfaces 102 together surround the outside of electrode assembly 1.

[0149] Wherein, the third direction Z is perpendicular to the first direction Y, and the third direction Z is perpendicular to the second direction X. As an example, the first direction Y is the thickness direction of the battery cell 10, the second direction X is the width direction of the battery cell 10, and the third direction Z is the height direction of the battery cell 10.

[0150] As an example, in electrode assembly 1, the innermost electrode portion is composed of multiple flat sheets bonded together. Except for the innermost electrode portion, each of the remaining electrode portions includes two flat sheets arranged opposite each other along a first direction Y and two curved sheets arranged opposite each other along a second direction X. The two curved sheets are respectively located at opposite ends of the flat sheets along the second direction X, and in each circle, the two flat sheets and two curved sheets are arranged alternately along the winding direction of the electrode portion of that circle. It should be noted that the outermost electrode portion refers to the outermost electrode portion after the electrode assembly 1 is wound, that is, the electrode portion that is not enclosed and is exposed. The outermost electrode portion also includes two straight sheets arranged opposite each other along the first direction Y and two curved sheets arranged opposite each other along the second direction X. The two curved sheets are respectively located at opposite ends of the straight sheets along the second direction X. In this outermost electrode portion, one curved sheet connects the two straight sheets in the circle, and the other curved sheet connects one straight sheet in the circle and one straight sheet in another adjacent circle. The straight portion 11 includes a plurality of straight sheets stacked along the first direction Y, and the corner portion 12 includes a plurality of curved sheets stacked.

[0151] The two large surfaces 101 are the outermost electrode portions, representing the two outer surfaces of two straight plates along the first direction Y. The two corner surfaces 102 are the outermost electrode portions, representing the outer surfaces of two curved plates facing the outer surface of the housing 21. The two large surfaces 101 and the two corner surfaces 102 are arranged alternately along the winding direction of the outermost electrode portions.

[0152] Understandably, the two corner surfaces 102 are set approximately opposite each other along the second direction X.

[0153] Understandably, the large surface 101 is set to extend in a roughly straight line, while the corner surface 102 is set to extend in a curved line.

[0154] The corner surface 102 protrudes away from the large surface 101 along the second direction X. That is, in the corner portion 12, the electrode protrudes away from the straight portion 11 along the second direction X, so that the electrode in the corner portion 12 is bent.

[0155] The tangent point 103 is the connecting part between the corner surface 102 and the large surface 101. Specifically, as shown... Figure 7 As shown, a tangent point is provided between the corner surface 102 and the large surface 101 on a cross section perpendicular to the third direction Z. The tangent point is the connection point between the corner surface 102 and the large surface 101. The tangent point portion 103 is a line segment extending along the third direction Z where the tangent point formed between the corner surface 102 and the large surface 101 is located. It can be understood that on a cross section perpendicular to the third direction Z, the cross section of the tangent point portion 103 is the tangent point between the corner surface 102 and the large surface 101, that is, the cross section of the tangent point portion 103 is the connection point between the corner surface 102 and the large surface 101. In other words, the cross section of the tangent point portion 103 is the connection point between the straight plane and the curved plane on the outer peripheral surface of the electrode assembly 1, which is also the tangent point.

[0156] Vertex 104 is the part of corner face 102 that is furthest from the large face 101 along the second direction X. As an example, such as... Figure 7 As shown, on the cross section perpendicular to the third direction Z, the point on the corner surface 102 that is farthest from the large surface 101 along the second direction X is the vertex, also known as the arc apex. The vertex portion 104 is a line segment extending along the third direction Z where the arc apex is located.

[0157] Understandably, each corner face 102 is provided with two tangent portions 103 and one vertex portion 104.

[0158] The support member 3 refers to a structure used to resist the expansion of the corner surface 102. The support member 3 is disposed opposite to the area of ​​the corner surface 102 between the tangent portion 103 and the vertex portion 104, meaning that at least a portion of the support member 3 is disposed opposite to the area of ​​the corner surface 102 between the tangent portion 103 and the vertex portion 104.

[0159] Specifically, the support member 3 is fixedly connected to the housing 21.

[0160] It should be noted that when the electrode assembly 1 and the support member 3 are assembled inside the housing 21, the support member 3 can be in contact with the corner surface 102, or the support member 3 can be spaced apart from the corner surface 102.

[0161] The battery cell 10 provided in this embodiment is provided with a support member 3 that is positioned opposite to the area between the tangent portion 103 and the vertex portion 104 of the corner surface 102. The support member 3 is used to resist the expansion of the corner surface 102, so that during the expansion of the electrode assembly 1, the support member 3 can at least abut against the area between the tangent portion 103 and the vertex portion 104 of the corner surface 102 to resist the expansion force of the electrode at the corner surface 102 and reduce the degree of expansion of the electrode at the corner surface 102. Specifically, the support member 3 can resist the expansion force of the electrode between the tangent portion 103 and the vertex portion 104 of the corner surface 102, and reduce the degree of expansion of the electrode between the tangent portion 103 and the vertex portion 104 of the corner surface 102. In this way, the expansion force of the electrode near the cutting point 103 on the corner surface 102 can be resisted by the support member 3, thereby reducing the degree of expansion of the electrode near the cutting point 103 on the corner surface 102. This reduces the tensile force generated by the cutting point 103 during expansion, thus reducing the risk of cracking of the electrode near the cutting point 103. That is, the risk of electrode cracking at the corner portion 12 of the electrode assembly 1 is reduced, which helps to extend the service life of the battery cell 10.

[0162] It should be noted that after the electrode assembly 1 expands, both the corner surface 102 and the large surface 101 will expand, which may cause the position of the cutting point 103 to shift. When the electrode assembly 1 expands, the support member 3 may or may not abut against the cutting point 103.

[0163] It should also be noted that the support member 3 helps improve the consistency of the battery cells 10. Furthermore, the support member 3 can reduce the risk of cracking of the casing 21 and electrolyte leakage without increasing the group margin of the battery cells 10.

[0164] In some embodiments, such as Figure 7 As shown in the accompanying drawings, and in conjunction with other figures, the area of ​​the corner surface 102 between the tangent portion 103 and the vertex portion 104 is disposed opposite to the support member 3 along the first direction Y, and the area of ​​the corner surface 102 between the tangent portion 103 and the vertex portion 104 is disposed opposite to the support member 3 along the second direction X.

[0165] This configuration allows the support 3 to effectively abut against the area between the corner surface 102 and the tangent portion 103 and the apex portion 104 during the expansion of the electrode assembly 1, thus resisting the expansion of the electrode sheet at the corner surface 102. This also allows the support 3 to resist the expansion force of the electrode sheet near the tangent portion 103 of the corner surface 102, reducing the tensile force generated at the tangent portion 103 during expansion and thereby lowering the risk of cracking of the electrode sheet near the tangent portion 103.

[0166] The electrode assembly 1, which is disposed adjacent to the inner wall of the receiving cavity 201 along the first direction Y, is defined as the first electrode assembly 1a. The tangent portion 103 of the first electrode assembly 1a, which is adjacent to the inner wall of the receiving cavity 201 along the first direction Y, is defined as the first tangent portion 103a.

[0167] In some embodiments, please refer to the following: Figures 5 to 7 And in conjunction with other accompanying drawings. The battery cell 10 includes two electrode assemblies 1 arranged along the first direction Y. Of the two tangent portions 103 of each corner surface 102, the tangent portion 103 farther away from the adjacent electrode assembly 1 is the first tangent portion 103a, and the area of ​​each corner surface 102 between the first tangent portion 103a and the vertex portion 104 is disposed opposite to the support member 3.

[0168] Understandably, in the two electrode assemblies 1, each electrode assembly 1 is disposed adjacent to the inner wall of the receiving cavity 201, and both electrode assemblies 1 are the first electrode assembly 1a.

[0169] Understandably, the two electrode assemblies 1 have a total of four corner surfaces 102, meaning the battery cell 10 has four corner surfaces 102. Of the two tangent portions 103 on each corner surface 102, one tangent portion 103 is closer to the adjacent electrode assembly 1 along the first direction Y; the other tangent portion 103 is farther from the adjacent electrode assembly 1 along the first direction Y and is adjacent to the inner wall of the receiving cavity 201 along the first direction Y. That is, each of the four corner surfaces 102 of the battery cell 10 has a tangent portion 103 that is adjacent to the inner wall of the receiving cavity 201 along the first direction Y, which is the first tangent portion 103a.

[0170] Alternatively, in some embodiments, the battery cell 10 includes three or more electrode assemblies 1 arranged along a first direction Y. Two electrode assemblies 1 located near the inner wall of the receiving cavity 201 along the first direction Y are designated as first electrode assemblies 1a. In each first electrode assembly 1a, the tangent portion 103 of each corner surface 102 that is furthest from the adjacent electrode assembly 1 is designated as a first tangent portion 103a. In each first electrode assembly 1a, the area of ​​each corner surface 102 between the first tangent portion 103a and the vertex portion 104 is disposed opposite to the support member 3.

[0171] Understandably, among the three or more electrode assemblies 1, two of them are first electrode assemblies 1a, and the two first electrode assemblies 1a are respectively disposed on opposite sides of the other electrode assemblies 1 along the first direction Y. The first electrode assembly 1a is closer to the inner wall of the receiving cavity 201 along the first direction Y than the other electrode assemblies 1, and is disposed adjacent to the inner wall of the receiving cavity 201.

[0172] Understandably, in each corner surface 102 of each first electrode assembly 1a, one of the two tangent portions 103 is closer to the adjacent electrode assembly 1 along the first direction Y; the other tangent portion 103 is farther from the adjacent electrode assembly 1 along the first direction Y and is adjacent to the inner wall of the receiving cavity 201 along the first direction Y. That is, in the four corner surfaces 102 of the two first electrode assemblies 1a, each corner surface 102 is provided with a tangent portion 103 that is adjacent to the inner wall of the receiving cavity 201 along the first direction Y, which is the first tangent portion 103a.

[0173] Alternatively, in some other embodiments, the number of electrode assemblies 1 in a single battery cell 10 is one. Each corner surface 102 is positioned opposite to the support member 3 in the region between each tangent portion 103 and vertex portion 104.

[0174] Understandably, the electrode assembly 1 is disposed adjacent to the inner wall of the receiving cavity 201, and the electrode assembly 1 is the first electrode assembly 1a.

[0175] Understandably, in the two corner surfaces 102 of the electrode assembly 1, the two tangent portions 103 of each corner surface 102 are arranged adjacent to the inner wall of the receiving cavity 201 along the first direction Y, and are all first tangent portions 103a. That is, all four tangent portions 103 of the two corner surfaces 102 of the electrode assembly 1 are first tangent portions 103a.

[0176] Understandably, the battery cell 10 has one or two electrode assemblies 1, and the battery cell 10 has four first cutting points 103a.

[0177] By adopting the above technical solution, in the electrode assembly 1 (first electrode assembly 1a) adjacent to the inner wall of the receiving cavity 201 along the first direction Y, the corner surface 102 is disposed opposite to the support member 3 in the area between the tangent portion 103 (first tangent portion 103a) and the vertex portion 104 adjacent to the inner wall of the receiving cavity 201 along the first direction Y. In this way, during the expansion of the electrode assembly 1, after the large surface 101 of the first electrode assembly 1a expands and abuts against the inner wall of the receiving cavity 201, the support member 3 can abut against the area between the corner surface 102 of the first electrode assembly 1a and the first cutting point 103a and the vertex 104. This prevents the electrode sheet between the corner portion 12 of the first electrode assembly 1a and the first cutting point 103a and the vertex 104 from expanding indefinitely under the resistance of the support member 3. Consequently, the electrode sheet near the first cutting point 103a of the first electrode assembly will not expand indefinitely under the resistance of the support member 3, reducing the tensile force generated by the first cutting point 103a and lowering the risk of cracking of the electrode sheet near the first cutting point 103a.

[0178] It should be added that, apart from the first cutting point 103a, the electrode sheets near the other cutting points 103 of the battery cell 10 can abut against each other with the adjacent electrode assembly 1 during the expansion of the electrode assembly 1. Since the electrode sheets of the electrode assembly 1 are flexible structures, the tensile force generated by the other cutting points 103 is not large, so the problem of electrode sheet cracking near the other cutting points 103 is not serious.

[0179] Among these, in some possible designs, such as Figure 7 As shown, the area between the corner surface 102 and the other tangent portion 103 and vertex portion 104 may not be opposite to the support member 3, so that during the expansion of the electrode assembly 1, the area between the corner surface 102 and the other tangent portion 103 and vertex portion 104 may not abut against the support member 3.

[0180] Alternatively, in some other possible designs, the housing 21 may be provided with multiple supports 3, at least one of which is disposed opposite to the corner surface 102 in the area between the other tangent portions 103 and apex portions 104. As an example, in each corner surface 102 of the battery cell 10, the area between each tangent portion 103 and apex portion 104 of the corner surface 102 can be disposed opposite to the corresponding support 3, so that the expansion of the electrode near each tangent portion 103 of the battery cell 10 can be reduced under the resistance of the support 3, thereby reducing the tensile force generated by each tangent portion 103 of the battery cell 10 and reducing the risk of cracking of the electrode near each tangent portion 103 of the battery cell 10.

[0181] In some embodiments, please refer to the following: Figures 6 to 8 And in conjunction with other accompanying drawings. The housing 21 includes two first walls 211 and two second walls 212. The two first walls 211 are arranged opposite each other along a first direction Y, and the two second walls 212 are arranged opposite each other along a second direction X. The first walls 211 and the second walls 212 surround and form a receiving cavity 201.

[0182] Understandably, the two second walls 212 are respectively located at opposite ends of the first wall 211 along the second direction X, and the two first walls 211 are respectively located at opposite ends of the second wall 212 along the first direction Y. The first walls 211 and the second walls 212 are interconnected.

[0183] Understandably, the first electrode assembly 1a and the first wall 211 are disposed adjacent to each other along the first direction Y, and the first cutting point portion 103a is disposed adjacent to the first wall 211 along the first direction Y.

[0184] In some embodiments, please refer to the following: Figures 6 to 8 And in conjunction with other accompanying drawings. The support member 3 is located at the corner formed by the connection of the first wall 211 and the second wall 212.

[0185] Understandably, each of the first walls 211 is connected to the corresponding second wall 212 at both ends along the second direction X, forming a corner position, so that the two first walls 211 and the two second walls 212 can be connected to form four corner positions.

[0186] The support member 3 is positioned at the corner formed by the connection of the first wall 211 and the second wall 212. This allows the corner surface 102 of the electrode assembly 1, adjacent to the inner wall of the receiving cavity 201 along the first direction Y, to be positioned opposite to the support member 3 in the region between the tangent portion 103a and the vertex portion 104 adjacent to the inner wall of the receiving cavity 201 along the first direction Y. Specifically, this allows the corner surface 102 of the first electrode assembly 1a to be positioned opposite to the support member 3 in the region between the first tangent portion 103a and the vertex portion 104. Thus, during the expansion of the electrode assembly 1, the support member 3 can easily abut against the corner surface 102 of the first electrode assembly 1a in the region between the first tangent portion 103a and the vertex portion 104, reducing the tensile force generated by the first tangent portion 103a and lowering the risk of electrode cracking near the first tangent portion 103a.

[0187] In other embodiments, the support member 3 is connected to the first wall 211 and the second wall 212, which can indirectly realize the connection between the first wall 211 and the second wall 212. The support member 3 can be integrally formed with the first wall 211 and the second wall 212, or it can be separately formed.

[0188] In some embodiments, please refer to Figure 8 Furthermore, in conjunction with other accompanying drawings, the two first walls 211 and the two second walls 212 are connected to form four corner positions, and each corner position is provided with a support member 3.

[0189] This configuration ensures that the area between the four first tangent portions 103a and the vertex portion 104 of the corner surface 102 of the battery cell 10 corresponds one-to-one with the support member 3 at the four corner positions. This allows the expansion of the electrode sheet between the four first tangent portions 103a and the vertex portion 104 of the corner surface 102 to be reduced by the resistance of the support member 3. This reduces the tensile force generated by the four first tangent portions 103a, lowers the risk of cracking of the electrode sheet near the first tangent portion 103a of the battery cell 10, and thus reduces the risk of cracking of the electrode sheet at the corner portion 12 of all electrode assemblies 1 of the battery cell 10.

[0190] In some embodiments, please refer to the following: Figure 6 and Figure 8 And in conjunction with other accompanying drawings. Support member 3 is connected to the first wall 211 and the second wall 212 respectively.

[0191] The support member 3 and the housing 21 can be separately configured. Specifically, the support member 3 is separately connected to the first wall 211 and the second wall 212. Alternatively, the support member 3 and the housing 21 can be integrally formed. Specifically, the support member 3 is integrally formed on the first wall 211 and the second wall 212.

[0192] This configuration allows the support member 3 to be connected between the first wall 211 and the second wall 212, while the first wall 211 and the second wall 212 are interconnected. This fixes the support member 3 to the first wall 211 and the second wall 212, creating a roughly triangular structure. This increases the structural strength of the support member 3 and its resistance to the corner portion 12. Furthermore, it reduces the expansion of the electrode near the first tangent point 103a, thereby reducing the tensile force on the first tangent point 103a and further decreasing the risk of cracking of the electrode near the first tangent point 103a.

[0193] In some embodiments, please refer to Figure 7 In conjunction with other accompanying drawings, the support member 3 and the first wall 211 form a first acute angle β1, and the support member 3 and the second wall 212 form a second acute angle β2.

[0194] By adopting the above technical solution, on the one hand, the first wall 211, the second wall 212, and the support member 3 can form a triangular structure, thereby improving the resistance of the support member 3 to the area between the corner surface 102 and the first tangent portion 103a and the vertex portion 104, thus reducing the risk of cracking of the electrode near the first tangent portion 103a. On the other hand, the area between the corner surface 102 and the first tangent portion 103a and the vertex portion 104 can be positioned opposite to the larger part of the support member 3, thereby facilitating the support member 3 to abut against the area between the corner surface 102 and the first tangent portion 103a and the vertex portion 104 after the corner portion 12 expands, thus further reducing the risk of cracking of the electrode near the first tangent portion 103a.

[0195] In some embodiments, please refer to Figure 7 And in conjunction with other accompanying figures, the first acute angle β1 is 30°~45°.

[0196] Specifically, the first acute angle β1 can be 30°, 30.6°, 31°, 31.4°, 32°, 32.8°, 33°, 33.8°, 34°, 34.7°, 35°, 35.1°, 36°, 36.4°, 37°, 37.2°, 38°, 38.8°, 39°, 39.2°, 40°, 40.7°, 41°, 41.6°, 42°, 42.3°, 43°, 43.4°, 44°, 44.5°, 45°, etc.

[0197] In some embodiments, please refer to Figure 7 And in conjunction with other attached figures, the second acute angle β2 is 30°~45°.

[0198] Specifically, the second acute angle β2 can be 30°, 30.6°, 31°, 31.4°, 32°, 32.8°, 33°, 33.8°, 34°, 34.7°, 35°, 35.1°, 36°, 36.4°, 37°, 37.2°, 38°, 38.8°, 39°, 39.2°, 40°, 40.7°, 41°, 41.6°, 42°, 42.3°, 43°, 43.4°, 44°, 44.5°, 45°, etc.

[0199] By adopting the above technical solution, at least one of the first acute angle β1 and the second acute angle β2 has a suitable size. On the one hand, this facilitates the improvement of the support member 3's resistance to the area between the corner surface 102 and the first tangent portion 103a and the vertex portion 104. On the other hand, it facilitates the support member 3 to abut against the area between the corner surface 102 and the first tangent portion 103a and the vertex portion 104 after the corner portion 12 expands. In this way, it helps to reduce the cracking problem of the electrode near the first tangent portion 103a.

[0200] In some embodiments, please refer to Figure 7 Furthermore, in conjunction with other accompanying drawings, the surface of the support member 3 facing the corner surface 102 is an arc-shaped surface that is recessed in a direction away from the corner surface 102.

[0201] During the expansion of the electrode assembly 1, the area between the corner surface 102 and the first tangent portion 103a and the vertex portion 104 can abut against the surface of the support member 3 facing the corner surface 102 after the corner portion 12 expands, so that the support member 3 resists the expansion of the electrode near the first tangent portion 103a.

[0202] This configuration allows the corner portion 12 to abut against the support member 3 at a larger position between the first tangent point 103a and the vertex portion 104 after expansion. This can improve the stress concentration problem in the part of the corner portion 102 that abuts against the support member 3, thereby improving the problems of electrode breakage and lithium plating caused by stress concentration.

[0203] Alternatively, in some other embodiments, please refer to Figure 9 And in conjunction with other accompanying figures. Figure 9 This is a partially enlarged schematic diagram of the housing 21 and electrode assembly 1 of the battery cell 10 provided in some embodiments of this application. The surface of the support member 3 facing the corner surface 102 is flat.

[0204] This design makes the structure of support member 3 relatively simple and easy to manufacture.

[0205] In some embodiments, please refer to Figure 7 Furthermore, in conjunction with other accompanying drawings, the support member 3 is an arc-shaped structure recessed in a direction away from the corner surface 102.

[0206] This design allows the surface of the support member 3 facing the corner surface 102 to be an arc-shaped surface that is recessed away from the corner surface 102, thereby improving the stress concentration problem in the part of the corner surface 102 that abuts against the support member 3.

[0207] Alternatively, in some other embodiments, please refer to Figure 9 Furthermore, in conjunction with other accompanying drawings, support member 3 is a flat plate structure that extends in a straight line.

[0208] This design makes the structure of support member 3 very simple and easy to manufacture.

[0209] In some embodiments, please refer to Figure 7 In conjunction with other accompanying drawings, the surface of the support member 3 facing the corner surface 102 is an arc-shaped surface that is recessed in a direction away from the corner surface 102. The support member 3 has a first end 301 connected to the first wall 211 and a second end 302 connected to the second wall 212. The distance between the line connecting the first end 301 and the second end 302 and the arc-shaped surface is less than or equal to 5 mm.

[0210] The connecting line between the first end 301 and the second end 302 is drawn with a dashed line.

[0211] The distance between the connecting line of the first end 301 and the second end 302 and the arc-shaped surface is L1, where L1 is less than or equal to 5mm. Specifically, L1 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5m m, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.4mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3. 8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, etc.

[0212] This configuration allows the arc-shaped surface of the support member 3 facing the corner surface 102 to have a suitable curvature, which facilitates a larger contact area between the corner surface 102 and the support member 3 after the corner portion 12 expands. This enables the support member 3 to further resist the expansion of the electrode near the first tangent point 103a, and further improves the stress concentration problem of the corner surface 102 used to abut against the support member 3.

[0213] In some embodiments, the end of the support member 3 used to connect to the first wall 211 (first end 301) may be located near the first tangent portion 103a along the second direction X. This allows the support member 3 to contact and abut against the area of ​​the corner surface 102 between the first tangent portion 103a and the apex portion 104 after the corner portion 12 expands. Furthermore, it allows for a suitable distance between the support member 3 and the corner surface 102, facilitating appropriate expansion of the corner portion 12 during charging and discharging.

[0214] In the second direction X, the first end 301 can be located on the side of the first tangent portion 103a away from the large surface 101. In this way, the problem of the large surface 101 abutting against the support member 3 during the expansion of the flat portion 11 can be avoided as much as possible, so as to prevent the flat portion 11 from being squeezed by the support member 3 and causing electrode breakage and lithium plating.

[0215] During the expansion of the electrode assembly 1, the position of the first tangent portion 103a may move away from the large surface 101 along the second direction X. Based on this, the first end 301 may be located on the side of the first tangent portion 103a closer to the large surface 101 along the second direction X.

[0216] In some possible designs, when the first end 301 is located on the side of the first tangent portion 103a close to the large surface 101 along the second direction X, the distance between the first end 301 and the first tangent portion 103a in the second direction X may be less than or equal to 2mm.

[0217] In some embodiments, the end of the support member 3 for connecting the second wall 212 (second end 302) may be located along the first direction Y on the side of the vertex portion 104 of the first electrode assembly 1a near the first tangent portion 103a. Alternatively, the end of the support member 3 for connecting the second wall 212 (second end 302) may also be located along the first direction Y on the side of the vertex portion 104 of the first electrode assembly 1a away from the first tangent portion 103a. Alternatively, the end of the support member 3 for connecting the second wall 212 (second end 302) may also be disposed opposite to the vertex portion 104 of the first electrode assembly 1a along the second direction X.

[0218] The support member 3 is used to connect one end (second end 302) of the second wall 212. The closer the support member 3 is to the first tangent point 103a along the first direction Y, the smaller the material used in the support member 3 becomes, which helps to ensure the energy density of the battery cell 10 to a certain extent. On the other hand, it helps to improve the structural strength of the support member 3.

[0219] The support member 3, with one end (second end 302) connecting to the second wall 212, can be located near the vertex portion 104 of the first electrode assembly 1a along the first direction Y. This allows for a suitable distance between the support member 3 and the corner surface 102, facilitating appropriate expansion of the corner portion 12 during charging and discharging, and mitigating stress concentration on the corner surface 102 where it abuts against the support member 3.

[0220] In some embodiments, please refer to the following: Figures 10 to 12 And in conjunction with other accompanying figures. Figure 10 This is a partial structural diagram of the casing 21 of the battery cell 10 provided in some embodiments of this application. Figure 11 for Figure 10 Enlarged view at point B in the middle. Figure 12 This is a top view of the support member 3 for the battery cell 10 provided in some embodiments of this application. The support member 3 has a first mounting groove 303 and a second mounting groove 304 at both ends, a first connecting part 213 on the first wall 211 and a second connecting part 214 on the second wall 212. The first connecting part 213 is installed in the first mounting groove 303 and the second connecting part 214 is installed in the second mounting groove 304.

[0221] Understandably, the first end 301 of the support member 3 is provided with a first mounting groove 303, and the second end 302 of the support member 3 is provided with a second mounting groove 304.

[0222] This configuration allows for the formation of a first connecting portion 213 and a second connecting portion 214 during the molding process of the housing 21. During the molding process of the support member 3, a first mounting groove 303 and a second mounting groove 304 can be formed on the support member 3. During the assembly of the battery cell 10, the first connecting portion 213 can be engaged in the first mounting groove 303, and the second connecting portion 214 can be engaged in the second mounting groove 304, so that both ends of the support member 3 are respectively connected to the first wall 211 and the second wall 212. This makes the assembly of the housing 21 and the support member 3 very simple, easy to implement, and very reliable.

[0223] Furthermore, this facilitates the bending of the support member 3, so that the surface of the support member 3 facing the corner surface 102 is an arc-shaped surface that is recessed in the direction away from the corner surface 102.

[0224] In some embodiments, please refer to the following: Figures 10 to 12 And in conjunction with other accompanying drawings. The first mounting groove 303 includes a first notch 3031 provided on the support member 3 and a first slot 3032 provided within the first notch 3031. The thickness of the first slot 3032 is greater than the thickness of the first notch 3031. The first connecting portion 213 includes a first transition portion 2131 and a first protrusion 2132 provided on the first transition portion 2131. The thickness of the first protrusion 2132 is greater than the thickness of the first transition portion 2131. The first protrusion 2132 is engaged within the first slot 3032, and the first transition portion 2131 is recessed within the first notch 3031.

[0225] With this configuration, during the process of engaging the first connecting portion 213 into the first mounting groove 303, the first protrusion 2132 first enters the first slot 3032 through the first notch 3031, thus engaging the first protrusion 2132 into the first slot 3032. When the first protrusion 2132 is engaged into the first slot 3032, the first transition portion 2131 is abutted within the first notch 3031.

[0226] The thickness of the first slot 3032 is greater than the thickness of the first notch 3031, and the thickness of the first protrusion 2132 is greater than the thickness of the first transition portion 2131. This allows the first protrusion 2132 to be stably engaged within the first slot 3032, preventing it from easily slipping out of the first mounting groove 303 through the first notch 3031. This improves the connection strength between the first connecting portion 213 and the first mounting groove 303, thereby enhancing the connection strength between the support member 3 and the first wall 211.

[0227] In some embodiments, please refer to the following: Figures 10 to 12 And in conjunction with other accompanying drawings. The second mounting groove 304 includes a second notch 3041 provided on the support member 3 and a second slot 3042 provided within the second notch 3041. The thickness of the second slot 3042 is greater than the thickness of the second notch 3041. The second connecting portion 214 includes a second transition portion 2141 and a second protrusion 2142 provided on the second transition portion 2141. The thickness of the second protrusion 2142 is greater than the thickness of the second transition portion 2141. The second protrusion 2142 is engaged within the second slot 3042, and the second transition portion 2141 is recessed within the second notch 3041.

[0228] With this configuration, during the process of engaging the second connecting portion 214 into the second mounting groove 304, the second protrusion 2142 first enters the second slot 3042 through the second notch 3041, causing the second protrusion 2142 to engage within the second slot 3042. When the second protrusion 2142 is engaged within the second slot 3042, the second transition portion 2141 is abutted within the second notch 3041.

[0229] The thickness of the second slot 3042 is greater than the thickness of the second notch 3041, and the thickness of the second protrusion 2142 is greater than the thickness of the second transition portion 2141. This allows the second protrusion 2142 to be stably engaged within the second slot 3042, preventing it from easily dislodging from the second mounting groove 304 through the second notch 3041. This improves the connection strength between the second connecting portion 214 and the second mounting groove 304, thereby enhancing the connection strength between the support member 3 and the second wall 212.

[0230] By adopting the above technical solution, the connection strength between the support member 3 and the housing 21 can be improved, thereby increasing the resistance of the support member 3 to the corner surface 102 and further reducing the risk of cracking of the electrode near the first cutting point 103a. In addition, the support member 3 is easy to bend so that the surface of the support member 3 facing the corner surface 102 is an arc-shaped surface that is recessed in a direction away from the corner surface 102.

[0231] In some embodiments, the support member 3 is adhered to the housing 21.

[0232] This design makes the assembly of the support 3 and the housing 21 very simple and easy to implement.

[0233] In some embodiments, please refer to the following: Figures 6 to 9 And in conjunction with other accompanying drawings. The receiving cavity 201 includes a liquid storage space 2011, and the side of the support member 3 away from the corner surface 102 is formed by the first wall 211 and the second wall 212 to form the liquid storage space 2011.

[0234] The liquid storage space 2011 is a part of the receiving cavity 201. Electrolyte can be stored in the liquid storage space 2011.

[0235] The liquid storage space 2011 is formed by the support member 3 being located on the side away from the corner surface 102 and enclosing the first wall 211 and the second wall 212, which makes the thickness of the support member 3 smaller. This makes it easier to reduce the amount of material used in the support member 3, and thus helps to ensure the energy density of the battery cell 10 to a certain extent.

[0236] In some embodiments, please refer to the following: Figures 6 to 9 , Figure 13 And in conjunction with other accompanying figures. Figure 13 This is a perspective view of the support member 3 of the battery cell 10 provided in some embodiments of this application. The support member 3 is provided with a through hole 305 communicating with the liquid storage space 2011.

[0237] This configuration allows the electrolyte in the storage space 2011 to be replenished into the electrode assembly 1 through the through hole 305, which helps to improve the charge and discharge cycle performance of the battery cell 10.

[0238] In some embodiments, please refer to Figure 13Furthermore, in conjunction with other accompanying drawings, the support member 3 is provided with a plurality of spaced-apart through holes 305.

[0239] By setting multiple through holes 305, the electrolyte in the storage space 2011 can be efficiently replenished into the electrode assembly 1, which helps to improve the charge and discharge cycle performance of the battery cell 10.

[0240] In some embodiments, please refer to the following: Figure 13 In conjunction with other accompanying drawings, the support member 3 is provided with multiple rows of through holes 305 spaced apart along the third direction Z, and the distance between two adjacent rows of through holes 305 along the third direction Z is 10mm~50mm.

[0241] Wherein, the distance between two adjacent rows of through holes 305 along the third direction Z is L2, and L2 can be 10mm, 10.2mm, 11mm, 11.3mm, 12mm, 12.4mm, 13mm, 13.5mm, 14mm, 14.1mm, 15mm, 15.5mm, 16mm, 16.3mm, 17mm, 17.8mm, 18mm, 18.1mm, 19mm, 19.5mm, 20mm, 20.7mm, 21mm, 21.8mm, 22mm, 22.5mm, 23mm, 23.6mm, 24mm, 24 .9mm, 25mm, 25.1mm, 26mm, 26.8mm, 27mm, 27.1mm, 28mm, 28.4mm, 29mm, 29.1mm, 30mm, 30.5mm, 31mm, 31.6mm, 32mm, 32.2mm, 33 mm, 33.4mm, 34mm, 35mm, 35.1mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, etc.

[0242] This design, on the one hand, provides the support member 3 with a number of through holes 305, facilitating the replenishment of electrolyte into the electrode assembly 1 through the through holes 305. On the other hand, it gives the support member 3 high structural strength, enabling it to better resist the expansion of the electrode near the first cutting point 103a, thereby reducing the problem of electrode cracking near the first cutting point 103a.

[0243] In other embodiments, multiple through holes 305 may be arranged irregularly on the support member 3.

[0244] In some embodiments, the diameter of the through hole 305 is 1mm to 2mm.

[0245] The space of the through hole 305 can be 1mm, 1.03mm, 1.1mm, 1.18mm, 1.2mm, 1.29mm, 1.3mm, 13.6mm, 1.4mm, 1.47mm, 1.5mm, 1.55mm, 1.6mm, 1.65mm, 1.7mm, 1.71mm, 1.8mm, 1.82mm, 1.9mm, 1.94mm, 2mm, etc.

[0246] The diameter of the through hole 305 is the maximum inner diameter of the through hole 305.

[0247] The through hole 305 can be round, square, oval, etc. When the through hole 305 is round, its diameter is the same as its maximum diameter. When the through hole 305 is square, its inner diameter is the dimension of its maximum diagonal.

[0248] This design allows the through-hole 305 to have a suitable aperture. On the one hand, it enables the electrolyte to be efficiently replenished into the electrode assembly 1 through the through-hole 305, which is beneficial to improving the charge-discharge cycle performance of the battery cell 10. On the other hand, it gives the support member 3 high structural strength, which can better resist the expansion of the electrode near the first cutting point 103a, thereby reducing the problem of electrode cracking near the first cutting point 103a.

[0249] In some embodiments, please refer to Figure 14 And in conjunction with other accompanying figures. Figure 14 This is an exploded view of the housing 21 and support member 3 of a battery cell 10 provided in some embodiments of this application. The housing 21 includes a first housing structure E and two second housing structures F, respectively disposed at both ends of the first housing structure E along a second direction X. A first wall 211 includes a first partition wall 2111 and two second partition walls 2112, respectively disposed at both ends of the first partition wall 2111 along the second direction X. The first housing structure E includes two first partition walls 2111. The second housing structure F includes a second wall 212 and two second partition walls 2112, respectively disposed at both ends of the second wall 212 along a first direction Y. The support member 3 is connected to the second wall 212 and the second partition walls 2112, respectively, and the first partition walls 2111 and the second partition walls 2112 are welded together.

[0250] The first shell structure E and the second shell structure F are two parts of the shell 21. The first shell structure E can be a one-piece molded structure, and the second shell structure F can also be a one-piece molded structure.

[0251] The first partition wall 2111 and the second partition wall 2112 enable the first shell structure E and the two second shell structures F to be welded together.

[0252] In this way, the shell 21 can be processed into a first shell structure E and two second shell structures F. Then, the support member 3 is connected to the second wall 212 and the second partition wall 2112 of the second shell structure F. Then, the first partition wall 2111 of the first shell structure E and the second partition wall 2112 of the two second shell structures F are welded together so that the first shell structure E and the two second shell structures F are welded together.

[0253] By adopting the above technical solution, it is easy to assemble the support 3 into the housing 21.

[0254] In some embodiments, the housing 21 includes two third shell structures distributed along the second direction X, the first wall 211 includes two third partition walls distributed along the second direction X, and the third shell structure includes a second wall 212 and two third partition walls, with the two third partition walls respectively disposed at both ends of the second wall 212 along the first direction Y. The support member 3 is respectively connected to the second wall 212 and the third partition walls, and the third partition walls of the two third shell structures are welded together.

[0255] In this way, the shell 21 can be processed into two third shell structures first, and then the support member 3 can be connected to the second wall 212 and the third partition wall of the third shell structure. Then the third partition walls of the two third shell structures can be welded together to make the two third shell structures welded.

[0256] By adopting the above technical solution, it is easy to assemble the support component 3 into the housing 21.

[0257] In some embodiments, please refer to Figure 15 And in conjunction with other accompanying figures. Figure 15 This is an exploded view of the housing 21 and support member 3 of the battery cell 10 provided in other embodiments of this application. The housing 21 includes two fourth shell structures C distributed along a first direction Y, and the second wall 212 includes two fourth sub-walls 2121 distributed along the first direction Y. The fourth shell structure C includes a first wall 211 and two fourth sub-walls 2121, with the two fourth sub-walls 2121 respectively disposed at both ends of the first wall 211 along the second direction X. The support member 3 is respectively connected to the first wall 211 and the fourth sub-walls 2121, and the fourth sub-walls 2121 of the two fourth shell structures C are welded together.

[0258] In this way, the shell 21 can be processed into two fourth shell structures C. Then, the support member 3 can be connected to the first wall 211 and the fourth partition wall 2121 of the fourth shell structure C. Then, the fourth partition walls 2121 of the two fourth shell structures C can be welded together.

[0259] By adopting the above technical solution, it is easy to assemble the support component 3 into the housing 21.

[0260] In some embodiments, on the third direction Z, each end of the support member 3 is not lower than the corner surface 102. The third direction Z is perpendicular to the first direction Y and the second direction X, respectively.

[0261] Understandably, at each end of the support member 3 along the third direction Z, the support member 3 extends beyond the corner surface 102 along the third direction Z, or the support member 3 is flush with the corner surface 102.

[0262] This configuration ensures that after the corner portion 12 expands, the corner surface 102 can abut against the support member 3 at various positions along the third direction Z. This further improves the reliability of the support member 3 abutting against the corner surface 102 and can further reduce the risk of electrode cracking near the first tangent point 103a.

[0263] In some embodiments, the support member 3 includes at least one of a metal structure and a plastic structure.

[0264] Understandably, the support member 3 can be made of at least one of metal or plastic materials.

[0265] This configuration gives the support member 3 high structural strength, providing strong resistance to the expansion of the corner portion 12, and further reducing the problem of electrode cracking near the first cutting point 103a.

[0266] Please see Figure 2 The battery device 100 provided in this application embodiment includes a battery cell 10. The battery cell 10 in this embodiment is the same as the battery cell 10 in the above embodiments; please refer to the relevant descriptions of the battery cell 10 in the above embodiments for details, which will not be repeated here.

[0267] The battery device 100 provided in this application reduces the risk of electrode cracking at the corner portion 12 of the electrode assembly 1 by adopting the battery cell 10 involved in the above embodiments, thereby improving the performance and lifespan of the battery cell 10 and thus improving the performance and lifespan of the battery device 100.

[0268] Please see Figure 1 The electrical device provided in this application embodiment includes a battery cell 10 or a battery device 100. The battery cell 10 and battery device 100 in this embodiment are the same as those in the above embodiments; please refer to the relevant descriptions of the battery cell 10 and battery device 100 in the above embodiments for details, which will not be repeated here.

[0269] The electrical device provided in this application embodiment, by employing the battery cell 10 or battery device 100 mentioned above, helps to improve the performance and lifespan of the electrical device.

[0270] The energy storage device provided in this application includes a battery cell 10 or a battery device 100. The battery cell 10 and battery device 100 in this embodiment are the same as those in the above embodiments. For details, please refer to the relevant descriptions of the battery cell 10 and battery device 100 in the above embodiments; they will not be repeated here.

[0271] The energy storage device provided in this application embodiment, by employing the battery cell 10 or battery device 100 mentioned above, helps to improve the performance and lifespan of the energy storage device.

[0272] The energy storage system provided in this application includes an energy storage device. The energy storage device in this embodiment is the same as the energy storage devices in the above embodiments; please refer to the relevant descriptions of the energy storage devices in the above embodiments for details, which will not be repeated here.

[0273] The energy storage system provided in this application, by employing the energy storage devices involved in the above embodiments, helps to improve the performance and lifespan of the energy storage system.

[0274] The charging network provided in this application includes charging piles and an energy storage device or energy storage system. The energy storage device is used to provide electrical energy to the charging piles. The energy storage device and energy storage system in this embodiment are the same as those in the above embodiments; please refer to the relevant descriptions of the energy storage devices and energy storage systems in the above embodiments for details, which will not be repeated here.

[0275] The charging network provided in this application, by employing the energy storage devices or energy storage systems involved in the above embodiments, helps to improve the performance and lifespan of the charging network.

[0276] As one embodiment of this application, such as Figures 6 to 8As shown, the battery cell 10 includes a housing 21 and an electrode assembly 1 disposed within a receiving cavity 201 of the housing 21. The outer periphery of the electrode assembly 1 includes two large surfaces 101 and two corner surfaces 102. The two large surfaces 101 are arranged opposite each other along a first direction Y, and the two corner surfaces 102 are respectively located at both ends of the large surfaces 101 along a second direction X, and are arranged opposite each other along the second direction X. The corner surfaces 102 protrude away from the large surfaces 101 along the second direction X, and a tangent portion 103 is provided between the corner surfaces 102 and the large surfaces 101. A vertex portion 104 is provided at the end of the corner surface 102 away from the large surfaces 101 along the second direction X. The housing 21 includes two first walls 211 arranged opposite each other along the first direction Y and two second walls 212 arranged opposite each other along the second direction X. The two first walls 211 and the two second walls 212 are connected to form four corner positions, and a support member 3 is provided at each of the four corner positions. The support member 3 is connected to the first wall 211 and the second wall 212, so that the support member 3, the first wall 211, and the second wall 212 can form a triangular structure. The tangent portion 103 adjacent to the first wall 211 along the first direction Y is the first tangent portion 103a, and the battery cell 10 has four first tangent portions 103a. The support member 3 at the four corner positions and the four first tangent portions 103a are respectively provided. The corner surface 102 is provided opposite to the corresponding support member 3 in the area between each first tangent portion 103a and the vertex portion 104, and the support member 3 is used to resist the expansion of the corresponding corner surface 102.

[0277] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The shell has a receiving cavity; An electrode assembly is disposed within the receiving cavity; the outer periphery of the electrode assembly includes two large surfaces and two corner surfaces, the two large surfaces are arranged opposite each other along a first direction, the two corner surfaces are respectively disposed at opposite ends of the large surfaces along a second direction, the corner surfaces are convex away from the large surfaces along the second direction, a tangent portion is provided between the corner surfaces and the large surfaces, and a vertex portion is provided at the end of the corner surfaces away from the large surfaces along the second direction; A support member is disposed within the housing and is disposed at least opposite to the area of ​​the corner surface between the tangent portion and the vertex portion. The support member is used to resist the expansion of the corner surface. The housing includes two first walls arranged opposite each other along the first direction and two second walls arranged opposite each other along the second direction. The first walls and the second walls enclose the receiving cavity. The support member is located at the corner position formed by the connection of the first walls and the second walls. The housing includes a first shell structure and two second shell structures respectively disposed at both ends of the first shell structure along the second direction. The first wall includes a first partition wall and two second partition walls respectively disposed at both ends of the first partition wall along the second direction. The first shell structure includes two first partition walls, and the second shell structure includes a second wall and two second partition walls respectively disposed at both ends of the second wall along the first direction. The support member is respectively connected to the second wall and the second partition walls, and the first partition wall and the second partition wall are welded together. Alternatively, the housing includes two third shell structures distributed along the second direction, and the first wall includes two third shell structures distributed along the second direction. Two third shell structures are provided, wherein the third shell structure includes a second wall and two third shell structures respectively located at both ends of the second wall along the first direction, the support member is respectively connected to the second wall and the third shell structure, and the third shell structures of the two third shell structures are welded together; or, the shell structure includes two fourth shell structures distributed along the first direction, the second wall includes two fourth shell structures distributed along the first direction, the fourth shell structure includes a first wall and two fourth shell structures respectively located at both ends of the first wall along the second direction, the support member is respectively connected to the first wall and the fourth shell structure, and the fourth shell structures of the two fourth shell structures are welded together; Wherein, the first direction and the second direction are perpendicular.

2. The battery cell according to claim 1, characterized in that, In the battery cell, there is one electrode assembly, and the area between each corner surface and each tangent part and vertex part is arranged opposite to the support member; Alternatively, the battery cell includes two electrode assemblies arranged along the first direction, and in each corner surface, the tangent portion away from the adjacent electrode assembly is the first tangent portion, and the area between the first tangent portion and the vertex portion of each corner surface is disposed opposite to the support member. Alternatively, the battery cell may include three or more electrode assemblies arranged along the first direction, with two electrode assemblies along the first direction near the inner wall of the receiving cavity being first electrode assemblies. In each first electrode assembly, the tangent portion of the two tangent portions of each corner surface that is away from the adjacent electrode assembly is the first tangent portion, and the area of ​​each corner surface between the first tangent portion and the vertex portion is disposed opposite to the support member.

3. The battery cell according to claim 1, characterized in that, The two first walls and the two second walls are connected to form four corner positions, and each corner position is provided with the support member.

4. The battery cell according to claim 1, characterized in that, The support members are respectively connected to the first wall and the second wall.

5. The battery cell according to claim 4, characterized in that, The support member and the first wall form a first acute angle, and the support member and the second wall form a second acute angle.

6. The battery cell according to claim 5, characterized in that, The first acute angle is 30° to 45°, and / or the second acute angle is 30° to 45°.

7. The battery cell according to claim 1, characterized in that, The surface of the support member facing the corner is an arc-shaped surface that is recessed in a direction away from the corner. Alternatively, the surface of the support member facing the corner is a plane.

8. The battery cell according to claim 1, characterized in that, The support member is an arc-shaped structure that is recessed in a direction away from the corner surface; Alternatively, the support member may be a flat plate structure that extends in a straight line.

9. The battery cell according to claim 4, characterized in that, The surface of the support member facing the corner is an arc-shaped surface that is recessed in a direction away from the corner. The support member has a first end connected to the first wall and a second end connected to the second wall. The distance between the connecting line of the first end and the second end and the arc-shaped surface is less than or equal to 5 mm.

10. The battery cell according to claim 4, characterized in that, The support member has a first mounting groove and a second mounting groove at both ends, a first connecting part on the first wall and a second connecting part on the second wall, the first connecting part is installed in the first mounting groove and the second connecting part is installed in the second mounting groove.

11. The battery cell according to claim 10, characterized in that, The first mounting groove includes a first notch on the support member and a first slot within the first notch, the thickness of the first slot being greater than the thickness of the first notch; the first connecting portion includes a first transition portion and a first protrusion on the first transition portion, the thickness of the first protrusion being greater than the thickness of the first transition portion, the first protrusion engaging within the first slot, and the first transition portion abutting within the first notch. And / or, the second mounting groove includes a second notch on the support member and a second slot within the second notch, the thickness of the second slot being greater than the thickness of the second notch; the second connecting portion includes a second transition portion and a second protrusion on the second transition portion, the thickness of the second protrusion being greater than the thickness of the second transition portion, the second protrusion engaging within the second slot, and the second transition portion abutting within the second notch.

12. The battery cell according to claim 1, characterized in that, The support is bonded to the housing.

13. The battery cell according to claim 1, characterized in that, The cavity includes a liquid storage space, and the side of the support member away from the corner surface is formed by the first wall and the second wall to create the liquid storage space.

14. The battery cell according to claim 13, characterized in that, The support member is provided with a through hole that communicates with the liquid storage space.

15. The battery cell according to claim 14, characterized in that, The support member is provided with a plurality of through holes spaced apart.

16. The battery cell according to claim 15, characterized in that, The support member is provided with multiple rows of through holes spaced apart along a third direction, and the distance between two adjacent rows of through holes along the third direction is 10mm to 50mm; wherein, the third direction is perpendicular to the first direction and the second direction respectively.

17. The battery cell according to claim 14, characterized in that, The diameter of the through hole is 1mm to 2mm.

18. The battery cell according to any one of claims 1-17, characterized in that, In the third direction, each end of the support member is not lower than the corner surface; wherein, the third direction is perpendicular to the first direction and the second direction respectively.

19. The battery cell according to any one of claims 1-17, characterized in that, The support component includes at least one of a metal structure and a plastic structure.

20. A battery device, characterized in that, Includes the battery cell according to any one of claims 1-19.

21. An electrical appliance, characterized in that, It includes a battery cell according to any one of claims 1-19; or, it includes a battery device according to claim 20.

22. An energy storage device, characterized in that, It includes a battery cell according to any one of claims 1-19; or, it includes a battery device according to claim 20.

23. An energy storage system, characterized in that, Includes the energy storage device according to claim 22.

24. A charging network, characterized in that, It includes a charging pile and an energy storage device according to claim 22 or an energy storage system according to claim 23, wherein the energy storage device is used to provide electrical energy to the charging pile.

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