Battery cell, battery device, energy storage device, energy storage system, and charging network

Abstract

This application relates to the field of battery technology, disclosing a battery cell, battery device, energy storage device, energy storage system, and charging network. The battery cell includes a casing, electrode assembly, and electrode terminals. The casing includes a first wall, a second wall, and circumferential sidewalls, which enclose a receiving space. The circumferential sidewalls include two alternating first sidewalls and two second sidewalls, with the dimension of the second sidewall along a second direction being larger than the dimension of the first sidewall along a third direction. The electrode assembly is disposed within the receiving space, and the electrode assembly includes a main body and tabs. Electrode terminals are disposed on either the first or second wall and are electrically connected to the tabs. At least one first sidewall has at least one integrally formed reinforcing structure, which is recessed towards the receiving space and protrudes from the inner wall surface of the first sidewall. This technical solution aims to solve the problem that the relatively weak pressure-bearing capacity of the first sidewall of the battery cell leads to easy deformation or fracture failure.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to a battery cell, battery device, energy storage device, energy storage system and charging network. Background Technology

[0002] In battery technology applications, the structural design of prismatic single-cell batteries includes sidewalls extending in different directions, with significant differences in size between the second and first sidewalls. When a battery cell is integrated into a real-world operating environment, the second sidewall is often constrained by external structures, such as the battery pack frame or a mounting device, to provide mechanical support and maintain overall stability and aid in thermal management. However, the first sidewall generally lacks an effective external constraint mechanism, making this area prone to deformation or rupture failure under internal pressure. Especially when a battery cell experiences thermal runaway, the high-temperature, high-pressure fumes generated by internal chemical reactions drastically increase the stress on the casing. Due to the relatively weak pressure-bearing capacity of the first sidewall, it is susceptible to deformation or rupture failure. Utility Model Content

[0003] The purpose of this application is to provide a battery cell, battery device, energy storage device, energy storage system and charging network, which aims to solve the problem that the relatively weak pressure-bearing capacity of the first sidewall of the battery cell makes it prone to deformation or rupture failure.

[0004] To achieve the above objectives, according to a first aspect of the embodiments of this application, a battery cell is provided, including a housing, an electrode assembly, and electrode terminals; the housing includes a first wall, a second wall, and circumferential sidewalls, the first wall and the second wall being disposed opposite each other at both ends of the circumferential sidewalls along a first direction and forming an accommodating space with the circumferential sidewalls, the circumferential sidewalls including two first sidewalls opposite each other along a second direction and two second sidewalls opposite each other along a third direction, the two first sidewalls and the two second sidewalls being alternately connected end to end, the dimension of the second sidewalls along the second direction being larger than the dimension of the first sidewalls along the third direction, the first direction, the second direction and the third direction being perpendicular to each other, the electrode assembly being disposed within the accommodating space, the electrode assembly including a main body and a tab disposed on the main body, the electrode terminals being disposed on the first wall or the second wall, and the electrode terminals being electrically connected to the tabs; wherein, at least one first sidewall has at least one integrally formed reinforcing structure, the reinforcing structure being recessed toward the accommodating space and protruding from the inner wall surface of the first sidewall, and the reinforcing structure being spaced apart from the corresponding second sidewalls on both sides along the third direction.

[0005] The embodiments of this application strengthen the weak points of the first sidewall by providing an integrally formed reinforcing structure on at least one first sidewall. The integrally formed reinforcing structure can effectively disperse and resist internal pressure, thereby improving the deformation resistance of the first sidewall and reducing the risk of deformation or rupture failure of the shell at the first sidewall.

[0006] In some embodiments, both first sidewalls have at least one integrally formed reinforcing structure. The integrally formed reinforcing structure enhances the mechanical strength of both first sidewalls, thereby improving their resistance to deformation and reducing the risk of deformation or fracture failure of the housing at the first sidewalls.

[0007] In some embodiments, along the second direction, the orthographic projection of a reinforcing structure on one of the first sidewalls at least partially coincides with the orthographic projection of a corresponding reinforcing structure on the other first sidewall. The reinforcing structures provide almost symmetrical support to the main body, resulting in better support for the main body.

[0008] In some embodiments, the reinforcing structure abuts against the main body. The reinforcing structure provides effective mechanical support to the main body, limiting its expansion during battery operation, thereby maintaining the stability of the electrode assembly.

[0009] In some embodiments, the surface of the reinforcing structure facing the main body is provided with an insulating coating.

[0010] In some embodiments, the projection of the outer contour of the reinforcing structure onto the first sidewall along the second direction is rectangular, which makes the space occupied by the reinforcing structure on the first sidewall more regular and helps to optimize the utilization of internal space. Furthermore, the length direction of the reinforcing structure is parallel to the first direction, which can provide more uniform and longer support or constraint along the first direction, thereby more effectively resisting expansion forces.

[0011] In some embodiments, the distance between the inner surfaces of the two first sidewalls is L, the group margin of the main body in the accommodating space along the second direction is B, the wall thickness of the first sidewall is m, and the protrusion height of the reinforcing structure from the inner surface of the first sidewall along the second direction is h, then m ≤ h < L*(1-B). The protrusion height h of the reinforcing structure of the battery cell is limited, which not only effectively improves the structural stability and deformation resistance of the battery cell, but also ensures the normal working space of the electrode assembly.

[0012] In some embodiments, the distance between the inner surfaces of the first and second walls is *a*, the dimension of the housing along a third direction is *W*, the group margin of the main body along the third direction within the receiving space is *C*, the wall thickness of the second sidewall is *M*, and the total area of ​​the projection of the outer contour of the reinforcing structure onto the first sidewall along the second direction is *S*. Therefore, 10%a*50%W ≤ S ≤ 30%a*(W-2M)*C. This allows the reinforcing structure to provide sufficient structural support, effectively enhancing the stiffness of the first sidewall and thus stabilizing the electrode assembly.

[0013] In some embodiments, the dimension of the housing along the third direction is W, the group margin of the main body in the accommodating space along the third direction is C, the wall thickness of the second sidewall is M, and the distance from the side of the reinforcing structure facing the corresponding second sidewall to the inner wall surface of the corresponding second sidewall is H. Then, [W-(W-2M)*C] / 2≤H<50%W / 2. When thermal runaway occurs inside the battery cell, the generated high-temperature and high-pressure flue gas can flow directionally to the pressure relief mechanism through the gas guiding path formed by this gap, thereby achieving directional pressure relief.

[0014] In some embodiments, each first sidewall has multiple reinforcing structures, with adjacent reinforcing structures spaced apart. These spaced-apart reinforcing structures not only ensure uniform support but also stably fix the electrode assembly, thereby improving the overall structural stability and reliability of the battery cell.

[0015] In some embodiments, the distance between the inner surfaces of the first and second walls is 'a', the group margin of the main body in the receiving space along the first direction is 'A', and the distance between two adjacent reinforcing structures is 'b'. Therefore, 20%a*A ≤ b < 50%a*A. This ensures that the reinforcing structures are not too sparse, thereby effectively providing continuous and uniform support to the main body of the electrode assembly and preventing unnecessary displacement or swaying in the first direction.

[0016] In some embodiments, along the first direction, the orthographic projections of at least two reinforcing structures on the same first sidewall are at least partially offset. While guiding and depressurizing the gas path corresponding to the first sidewall, this can block some particulate matter in the high-temperature, high-pressure flue gas, thereby reducing the possibility of the depressurization mechanism being blocked by particulate matter.

[0017] In some embodiments, each first sidewall has only one reinforcing structure, and along the second direction, the projection of the center point of the reinforcing structure coincides with the projection of the center point of the first sidewall.

[0018] According to a second aspect of the embodiments of this application, a battery device is provided. The battery device includes the aforementioned battery cell, which is used to store or provide electrical energy.

[0019] In some embodiments, the size of the battery cell housing along the first direction is larger than the size along the second direction.

[0020] In some embodiments, the battery device includes a housing and at least one battery cell assembly. The at least one battery cell assembly is disposed in the housing. The battery cell assembly includes a plurality of battery cells arranged in a third direction to form the battery cell assembly. Two second sidewalls between two adjacent battery cells abut against each other, and the two second sidewalls at both ends of the battery cell assembly in the third direction are respectively abutted by the corresponding sidewalls of the housing.

[0021] In some embodiments, the battery cell further includes a pressure relief mechanism; both the electrode terminals and the pressure relief mechanism are disposed on the first wall, and the second wall abuts against the bottom wall of the housing.

[0022] In some embodiments, the battery cell further includes a pressure relief mechanism, the electrode terminals are disposed on the first wall, the pressure relief mechanism is disposed on the second wall, the gravity direction of the electrode assembly is parallel to the second direction when the battery cell is in the working state, and the first side wall or the second side wall abuts against the bottom wall of the housing.

[0023] In some embodiments, the battery device includes at least two battery cell assemblies arranged along a first direction, with the pressure relief mechanisms of adjacent battery cells positioned opposite each other between adjacent battery cell assemblies. During pressure relief, the pressure relief gas source positions of the battery cells remain relatively fixed, which facilitates the subsequent layout of fire extinguishing structures.

[0024] In some embodiments, the battery device includes at least two battery cell assemblies arranged along a first direction, with the electrode terminals of adjacent battery cells in adjacent battery cell assemblies positioned opposite each other. The oppositely positioned electrode terminals are close to each other, facilitating wiring between battery cells in adjacent battery cell assemblies.

[0025] According to a third aspect of the embodiments of this application, an energy storage device is provided. Wherein: The energy storage device includes battery cells as described above, which are used to store or provide electrical energy; Alternatively, the energy storage device may include a battery device as described above, which is used to store or provide electrical energy.

[0026] According to a fourth aspect of an embodiment of this application, an energy storage system is provided. The energy storage system includes: Energy conversion system; and As mentioned above, in an energy storage device, the energy conversion system is electrically connected between the power generation device and the energy storage device.

[0027] According to a fifth aspect of an embodiment of this application, a charging network is provided. The charging network includes charging piles; and, The charging network also includes energy storage devices as described above, and the charging piles are electrically connected to the energy storage devices. Alternatively, the charging network may also include an energy storage system as described above, with the charging piles electrically connected to the energy storage system; Among them, the energy storage device is used to provide power to the charging pile. Attached Figure Description

[0028] 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. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a three-dimensional structural diagram of a battery cell according to an embodiment of this application; Figure 2 for Figure 1 A schematic diagram of the left side of a single battery cell is shown; Figure 3 for Figure 2 Cross-sectional view along the DD direction; Figure 4 for Figure 3 Enlarged view of point E in the middle; Figure 5 This is a three-dimensional structural diagram of another battery cell according to an embodiment of this application; Figure 6 for Figure 5 A bottom-view schematic diagram of a single battery cell is shown; Figure 7 for Figure 6 Cross-sectional view along the FF direction; Figure 8 This is an exploded view of a battery device according to an embodiment of this application; Figure 9 This is a schematic diagram of the structure of an energy storage device according to an embodiment of this application.

[0030] The figures in the diagram are labeled as follows: 100. Battery cell; 101. Battery cell assembly; 10. Shell; 11. First wall; 12. Second wall; 13. Circumferential side wall; 131. First side wall; 132. Second side wall; 14. Accommodation space; 20. Electrode assembly; 21. Main body; 22. Electrode tab; 31. Electrode terminals; 32. Pressure relief mechanism; 40. Strengthen the structure; 200. Battery assembly; 201. Box body; 202. Box cover; 203. Assembly space; 300. Energy storage device; 301. Cabinet; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0031] 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.

[0032] In the description 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 accompanying drawings, and 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, and therefore should not be construed as a limitation of this application.

[0033] Furthermore, the terms "first," "second," etc., 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. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "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. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] Currently, judging from market trends, the application of new energy batteries is becoming increasingly widespread. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants (batteries used in these applications are generally referred to as energy storage batteries), but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars (batteries used in these applications are generally referred to as power batteries).

[0036] In related technologies, when a battery cell is in operation, the second sidewall direction is typically externally constrained, while at least one first sidewall is unconstrained or has relatively weak constraining capacity. This results in insufficient mechanical strength and relatively weak pressure-bearing capacity of the unconstrained or weakly constrained first sidewall. When thermal runaway occurs inside the battery cell, the locations where the casing is fractured by internal pressure are concentrated in the unconstrained or weakly constrained first sidewall, thus affecting the reliability of the battery cell.

[0037] For example, in a battery assembly, a battery cell assembly is formed by arranging multiple battery cells along a third direction Z, with the second sidewalls of adjacent battery cells abutting each other, and the second sidewalls at both ends of the battery cell assembly along the third direction Z constrained by a housing. However, at least one first sidewall of each battery cell is not externally constrained. In the event of thermal runaway, the internal pressure causes the unconstrained or relatively weak first sidewall, which has insufficient mechanical strength and relatively weak pressure-bearing capacity, to deform or rupture, increasing the risk of thermal diffusion.

[0038] It is evident that if the problems of insufficient mechanical strength and relatively weak pressure bearing capacity of the first sidewall of the battery cell, which is unconstrained or has relatively weak constraint capacity, are not addressed, the possibility of thermal runaway propagation will increase, affecting the reliability of adjacent battery cells.

[0039] Based on the above considerations, embodiments of this application provide a battery cell that directly strengthens the weak points of at least one first sidewall by providing an integrally formed reinforcing structure on at least one first sidewall. The integrally formed reinforcing structure can effectively disperse and resist internal pressure, thereby improving the deformation resistance of the first sidewall and reducing the risk of deformation or rupture failure of the casing at the first sidewall.

[0040] Furthermore, the battery cells provided in this application are used in the manufacture of battery devices, energy storage devices, energy storage systems, and charging networks.

[0041] To illustrate the technical solutions provided by the embodiments of this application, the following detailed description is provided in conjunction with specific drawings and embodiments.

[0042] According to a first aspect of the embodiments of this application, embodiments of this application provide a battery cell 100. For example... Figures 1 to 7 As shown, the battery cell 100 includes a housing 10, an electrode assembly 20, and electrode terminals 31. The housing 10 includes a first wall 11, a second wall 12, and a circumferential sidewall 13. The first wall 11 and the second wall 12 are disposed opposite each other at both ends of the circumferential sidewall 13 along a first direction X, and together with the circumferential sidewall 13, form an accommodating space 14. The circumferential sidewall 13 includes two first sidewalls 131 opposite each other along a second direction Y and two second sidewalls 132 opposite each other along a third direction Z. The two first sidewalls 131 and the two second sidewalls 132 are alternately connected end to end. The dimension of the second sidewall 132 along the second direction Y is larger than the dimension of the first sidewall 131 along the third direction Z. The first direction X, the second direction Y, and the third direction Z are... The three components are perpendicular to each other. The electrode assembly 20 is disposed in the receiving space 14. The electrode assembly 20 includes a main body 21 and a tab 22 disposed on the main body 21. The electrode terminal 31 is disposed on the first wall 11 or the second wall 12 and is electrically connected to the tab 22. At least one of the first sidewalls 131 has at least one integrally formed reinforcing structure 40. The reinforcing structure 40 is recessed toward the receiving space 14 and protrudes from the inner wall surface of the first sidewall 131. The reinforcing structure 40 is spaced apart from the corresponding second sidewall 132 on both sides along the third direction Z. The two second sidewalls 132 are constrained by external forces when the battery cell 100 is in the working state.

[0043] To facilitate understanding, the following explains some key technical terms: A battery cell 100 is a device for storing or providing electrical energy. It contains electrochemically active materials and achieves the conversion and storage of electrical energy through chemical reactions.

[0044] The housing 10 is the external encapsulation structure of the battery cell 100, used to protect the internal electrode assembly 20 and provide mechanical support. The housing 10 is made of metal or polymer material and has a certain strength and sealing performance.

[0045] The first wall 11 and the second wall 12 are two oppositely disposed end faces of the housing 10, which define the length of the housing 10 at both ends along the first direction X. The first wall 11 and the second wall 12 are typically two end caps or end walls at both ends of the length direction of the housing 10; that is, the first direction X is the length direction of the battery cell 100.

[0046] The circumferential sidewall 13 connects to the first wall 11 and the second wall 12, together forming an internal receiving space 14 for accommodating the electrode assembly 20. The first sidewall 131 and the second sidewall 132 are components of the circumferential sidewall 13. The first sidewall 131 is arranged opposite each other along the second direction Y, while the second sidewall 132 is arranged opposite each other along the third direction Z. They are alternately connected end to end, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. That is to say, the outer contour shape of the battery cell 100 of this application is a cuboid shape, i.e., a square cell. Here, the second direction Y is the width direction of the battery cell 100, and the third direction Z is the thickness direction of the battery cell 100.

[0047] The electrode assembly 20 is the core functional component of the battery cell 100, formed by winding or stacking a positive electrode, a negative electrode, and a separator, and is used for electrochemical reactions. The main body 21 is the main part of the electrode assembly 20, containing most of the electrochemically active materials. The tabs 22 are the leads of the electrode assembly 20, used to connect the electrode assembly 20 to an external circuit to realize the input and output of electrical energy.

[0048] The electrode terminal 31 is an external connection point provided on the first wall 11 or the second wall 12 of the housing 10. Through the electrode terminal 31, the battery cell 100 can be electrically connected to an external circuit.

[0049] The reinforcing structure 40 is a structure integrally formed on the first sidewall 131, and is recessed towards the receiving space 14 and protrudes from the inner wall surface of the first sidewall 131. The function of the reinforcing structure 40 is to enhance the mechanical strength of the first sidewall 131.

[0050] Specifically, the casing 10 of the battery cell 100 is square, with its interior forming a square receiving space 14. The electrode assembly 20 is placed within this receiving space 14 and electrically connected to the electrode terminals 31. The electrode terminals 31 can be located at the top or bottom of the casing 10 for easy connection to an external circuit. The circumferential sidewalls 13 of the casing 10 can be formed by bending a continuous material or by welding multiple wall panels. For example, the circumferential sidewalls 13 can be formed by connecting four independent wall panels using laser welding.

[0051] To enhance the mechanical strength of the casing 10 of the battery cell 100, particularly the mechanical strength of the unconstrained or relatively weakly constrained first sidewall 131, the unconstrained or relatively weakly constrained first sidewall 131 has at least one integrally formed reinforcing structure 40. This reinforcing structure 40 can be formed in various ways, such as directly on the material of the unconstrained or relatively weakly constrained first sidewall 131 by processes such as stamping, molding, or injection molding. The reinforcing structure 40 is recessed towards the receiving space 14 and protrudes from the inner wall surface of the first sidewall 131; that is, the reinforcing structure 40 forms a protrusion on the inner surface of the first sidewall 131, thereby structurally increasing the bending and deformation resistance of the first sidewall 131. For example, the reinforcing structure 40 can be designed as an inwardly recessed groove structure with a protrusion at its bottom, forming contact or near contact with the main body 21 of the electrode assembly 20. Furthermore, the reinforcing structure 40 is spaced apart from the corresponding second sidewall 132 on both sides along the third direction Z. In other words, the reinforcing structure 40 does not extend to the edge of the second sidewall 132, but leaves a certain gap between it and the second sidewall 132. This gap can serve as a guide path for the flow of high-temperature and high-pressure flue gas generated during thermal runaway.

[0052] When the battery cell 100 is in operation, the two second sidewalls 132 are constrained by external forces. These external forces can be provided by external clamps, the battery module frame, or adjacent battery cells 100. For example, in a battery module, multiple battery cells 100 can be arranged closely along a third direction Z, such that the second sidewalls 132 of adjacent battery cells 100 abut against each other, thereby constraining the second sidewalls 132. These external forces help limit the expansion of the second sidewalls 132 and improve their pressure-bearing capacity.

[0053] The following example will illustrate this point in more detail: In a battery module, multiple battery cells 100 are arranged closely together. The casing 10 of each battery cell 100 is designed to be square. When the battery cell 100 is in operation, such as during charge-discharge cycles, the electrode assembly 20 may expand to a certain extent due to internal chemical reactions. This expansion exerts internal pressure on the casing 10. In the battery module, these battery cells 100 are arranged closely along the third direction Z, such that the second sidewalls 132 of adjacent battery cells 100 abut against each other and are constrained by an external frame or clamp. This constraint effectively limits the ability of the second sidewalls 132 to expand outward. Therefore, the internal pressure generated by the expansion of the electrode assembly 20 mainly acts on the first sidewalls 131 that have no external constraint or have a weak constraint. To cope with the internal pressure borne by the unconstrained or relatively weakly constrained first sidewall 131, at least one reinforcing structure 40 is integrally formed on the unconstrained or relatively weakly constrained first sidewall 131. This reinforcing structure 40 is recessed towards the receiving space 14 and protrudes from the inner wall surface of the first sidewall 131. The reinforcing structure 40 significantly improves the mechanical strength and deformation resistance of the first sidewall 131, thereby enhancing its overall deformation resistance when subjected to internal pressure. When the electrode assembly 20 expands, the main body 21 pushes the first sidewall 131 outward. The reinforcement structure 40 allows the first sidewall 131 to better resist internal pressure, thereby reducing the risk of deformation or cracking at the first sidewall 131. Overall, this technical solution effectively enhances the overall mechanical strength of the battery cell 100 housing 10, especially the strength of the first sidewall 131, by setting an integrally formed reinforcing structure 40 on the first sidewall 131 which is unconstrained or has relatively small constraint capacity, and combining it with the external constraint of the second sidewall 132, thereby improving the reliability of the battery cell 100.

[0054] The embodiments of this application strengthen the weak points of the first sidewall 131 by providing an integrally formed reinforcing structure 40 on the unconstrained or relatively weak first sidewall 131. The integrally formed reinforcing structure 40 can effectively disperse and resist internal pressure, thereby improving the deformation resistance of the first sidewall 131 and reducing the risk of deformation or cracking failure of the shell 10 at the first sidewall 131.

[0055] In some embodiments, each of the two first sidewalls 131 has at least one integrally formed reinforcing structure 40. In this embodiment, the mechanical strength of both first sidewalls 131 of the square battery cell is enhanced by the integrally formed reinforcing structure 40, which directly strengthens the weak points of the first sidewalls 131. The integrally formed reinforcing structure 40 can effectively disperse and resist internal pressure, thereby improving the deformation resistance of the first sidewalls 131 and reducing the risk of deformation or cracking failure of the housing 10 at the first sidewalls 131.

[0056] In some embodiments, when both first sidewalls 131 are provided with integrally formed reinforcing structures 40, along the second direction Y, the orthographic projection of the reinforcing structure 40 on one first sidewall 131 at least partially coincides with the orthographic projection of the corresponding reinforcing structure 40 on the other first sidewall 131. That is, the reinforcing structure 40 on any one first sidewall 131 only strengthens the mechanical strength of that first sidewall 131 and does not affect the mechanical strength of the other first sidewall 131. In this application, the orthographic projection of the reinforcing structure 40 on one first sidewall 131 preferably completely coincides with the orthographic projection of the corresponding reinforcing structure 40 on the other first sidewall 131. This simplifies the design layout of the reinforcing structure 40, simplifies the manufacturing process, and thus improves manufacturing efficiency. Furthermore, when the orthographic projection of the reinforcing structure 40 on one of the first sidewalls 131 coincides with the orthographic projection of the corresponding reinforcing structure 40 on the other first sidewall 131, the corresponding support points of the reinforcing structures 40 on the two first sidewalls 131 are on the same straight line as the corresponding support points of the main body 21 of the electrode assembly 20. That is, the reinforcing structure 40 provides symmetrical support to the main body 21 and provides better support to the main body 21.

[0057] In some embodiments, the reinforcing structure 40 is insulated against the main body 21. "Insulated contact" means that there is physical contact between the reinforcing structure 40 and the main body 21, but this contact is electrically insulating, effectively preventing current flow between them, thus providing mechanical support while achieving electrical isolation. Various methods can be used to achieve this insulated contact. For example, a separate insulating material (i.e., an insulating coating), such as a polymer film, ceramic coating, or insulating tape, can be provided between the contact interface of the reinforcing structure 40 and the main body 21. These materials can be pre-attached to the surface of the reinforcing structure 40 or wrapped around the corresponding contact area of ​​the main body 21. Alternatively, during manufacturing, the outer surface of the main body 21 may be wrapped with an insulating layer, such as a diaphragm or outer covering film used during electrode winding or stacking (e.g., a Mylar film covering the main body 21). The reinforcing structure 40 can then directly abut against this insulating layer of the main body 21, thereby achieving insulated contact.

[0058] The solution in this application designs the reinforcing structure 40 to insulate against the main body 21, enabling the reinforcing structure 40 to physically support and constrain the expansion of the main body 21, thereby effectively limiting the deformation of the main body 21 in the second direction Y, while preventing electrical contact between the reinforcing structure 40 and the main body 21. This fully utilizes the mechanical strength of the reinforcing structure 40 to stabilize the electrode assembly 20, while reducing the possibility of internal short circuits caused by direct contact between the metal reinforcing structure 40 and the electrode assembly 20. Furthermore, the constraint of the two second sidewalls 132 by external forces during battery cell 100 operation, along with the insulated contact between the reinforcing structure 40 and the main body 21, further improves the overall support for the electrode assembly 20 and enhances the reliability of the battery cell 100.

[0059] Through the above technical solution, the reinforcing structure 40 can provide effective mechanical support for the main body 21, limiting its expansion during battery operation and thus maintaining the stability of the electrode assembly 20. Furthermore, since the reinforcing structure 40 and the main body 21 achieve insulated contact, problems such as internal short circuits that may occur due to physical contact are effectively reduced, improving the reliability of the battery cell 100.

[0060] In some embodiments, the surface of the reinforcing structure 40 facing the main body 21 is provided with an insulating coating. For example, a separate insulating material (i.e., an insulating coating), such as a polymer film, a ceramic coating, or an insulating tape, can be provided between the contact interface between the reinforcing structure 40 and the main body 21. These materials can be pre-attached to the surface of the reinforcing structure 40 to achieve insulating contact.

[0061] In some embodiments of this application, the projection of the outer contour of the reinforcing structure 40 onto the first sidewall 131 along the second direction Y is rectangular. A rectangle is a regular and easily manufactured geometric shape with straight edges, facilitating mold processing and forming. Using a rectangular contour allows the reinforcing structure 40 to occupy a more regular space on the first sidewall 131, which is beneficial for optimizing the utilization of internal space. The rectangular shape also facilitates providing a uniform support surface under stress. The rectangular contour makes the contact surface between the reinforcing structure 40 and the electrode assembly 20 regular and continuous, reducing the possibility of localized stress concentration that might be caused by irregular shapes, thereby helping to evenly distribute the expansion force onto the first sidewall 131. Furthermore, the length direction of the reinforcing structure 40 is parallel to the first direction X, which allows the reinforcing structure 40 to provide a more uniform and longer support or constraint along the first direction X when the battery cell 100 expands, thereby more effectively resisting the expansion force. The phrase "the length direction of the reinforcing structure 40 is parallel to the first direction X" includes, but is not limited to: the length direction of the reinforcing structure 40 can completely coincide with the first direction X; or, the length direction of the reinforcing structure 40 maintains a certain degree of parallelism with the first direction X, for example, the deviation is within 5 degrees.

[0062] In some embodiments of this application, such as Figure 3 As shown, the distance between the inner surfaces of the two first sidewalls 131 is L, and the group margin of the main body 21 along the second direction Y within the accommodating space 14 is B, as... Figure 4 As shown, the wall thickness of the first sidewall 131 is m, and the height of the reinforcing structure 40 protruding from the inner wall surface of the first sidewall 131 along the second direction Y is h. Then m≤h<L*(1-B).

[0063] in: The distance L between the inner surfaces of the two first sidewalls 131 refers to the internal width of the battery cell 100 housing 10 in the second direction Y, which constitutes the maximum usable size of the accommodating space 14 in that direction.

[0064] The group margin B of the main body 21 in the accommodating space 14 along the second direction Y refers to the proportional relationship between the actual size occupied by the main body 21 in the accommodating space 14 along the second direction Y and the total size L of the accommodating space 14 in that direction, reflecting the degree of filling or reserved space of the main body 21 in the accommodating space 14 along the second direction Y.

[0065] The wall thickness m of the first sidewall 131 refers to the material thickness of the first sidewall 131. The wall thickness m is the basic dimension when the reinforcing structure 40 is integrally formed. The protrusion height of the reinforcing structure 40 should at least reach or exceed the wall thickness m.

[0066] The protrusion height h of the reinforcing structure 40 along the second direction Y from the inner wall surface of the first side wall 131 refers to the distance by which the reinforcing structure 40 protrudes from the inner surface of the first side wall 131 into the receiving space 14. The protrusion height h affects the supporting and constraining effect of the reinforcing structure 40 on the main body 21, as well as the degree to which it occupies the receiving space 14.

[0067] In this application, by limiting the protrusion height h of the reinforcing structure 40 from the inner wall surface of the first sidewall 131 along the second direction Y, the condition m≤h<L*(1-B) is satisfied, thereby achieving an optimized balance between structural reinforcement and space utilization. This ensures that the reinforcing structure 40 provides reliable structural support without negatively impacting the electrochemical performance and safe operation of the battery cell 100.

[0068] Through the above technical solution, the protrusion height h of the reinforcing structure 40 of the battery cell 100 is limited. While providing sufficient structural support and reducing the possibility of deformation of the first sidewall 131, the reinforcing structure 40 will not interfere with the main body 21 of the electrode assembly 20. This not only effectively improves the structural stability and deformation resistance of the battery cell 100, but also ensures the normal working space of the electrode assembly 20, reduces the possibility of performance degradation due to structural compression, thereby improving the overall reliability and service life of the battery cell 100.

[0069] In some embodiments of this application, such as Figure 3 As shown, the distance from the inner wall surface of the first wall 11 to the inner wall surface of the second wall 12 is a, as follows: Figure 1 As shown, the dimension of the shell 10 along the third direction Z is W, and the group margin of the main body 21 along the third direction Z within the receiving space 14 is C, as... Figure 2 As shown, the wall thickness of the second sidewall 132 is M, and the total area of ​​the projection of the outer contour of the reinforcing structure 40 along the second direction Y onto the first sidewall 131 is S. Then, 10%a*50%W≤S≤30%a*(W-2M)*C.

[0070] in: The distance 'a' between the inner wall surface of the first wall 11 and the inner wall surface of the second wall 12 refers to the effective length of the inside of the battery cell 100 housing 10 along the first direction X.

[0071] The dimension W of the housing 10 along the third direction Z refers to the total width of the outer side of the housing 10 of the battery cell 100 along the third direction Z.

[0072] The group margin C of the main body 21 in the third direction Z within the receiving space 14 refers to the proportion of the gap reserved in the main body 21 of the electrode assembly 20 in the third direction Z within the receiving space 14 to the total internal width. This group margin C is designed to provide the necessary space for the electrode assembly 20 to expand or contract during charging and discharging, thereby reducing the possibility of excessive stress on the housing 10 or causing an internal short circuit.

[0073] The wall thickness M of the second sidewall 132 refers to the material thickness of the two second sidewalls 132 of the shell 10. This wall thickness M is a key parameter for calculating the effective internal width (i.e., W-2M) of the shell 10.

[0074] The total area S of the projection of the outer contour of the reinforcing structure 40 onto the first sidewall 131 along the second direction Y refers to the effective area occupied by the reinforcing structure 40 on the surface of the first sidewall 131 when viewed from the second direction Y.

[0075] By setting a range for the total projected area S of the reinforcing structure 40, a quantitative relationship is established between it and the dimensions (a, W, M) of the battery cell 100 and the group margin C of the electrode assembly 20. Specifically, the lower limit of 10%a*50%W ensures that the reinforcing structure 40 has sufficient dimensions to provide the necessary structural stiffness for the first sidewall 131, effectively supporting the electrode assembly 20 and preventing undesirable deformation due to internal pressure or external impact during operation, thus helping to maintain the stability and electrochemical performance of the electrode assembly 20. Furthermore, the upper limit of 30%a*(W-2M)*C takes into account the effective internal width (W-2M) of the accommodating space 14 and the group margin C of the main body 21 along the third direction Z. By limiting S below this upper limit, the problem of the reinforcing structure 40 excessively encroaching on the activity space required by the electrode assembly 20 is solved. This allows the electrode assembly 20 to have sufficient expansion and contraction margin during charge and discharge cycles, thereby preventing interference between the reinforcing structure 40 and the main body 21 and causing mechanical damage to the electrode assembly 20, ensuring the long-term reliability of the battery cell 100. This design enables the reinforcing structure 40 to provide structural reinforcement while optimizing the utilization of internal space, achieving a balance between structural support and space efficiency.

[0076] Through the above technical solution, the total projected area S of the reinforcing structure 40 is limited to a reasonable range. This allows the reinforcing structure 40 to provide sufficient structural support, effectively enhancing the rigidity of the first sidewall 131, thereby stabilizing the electrode assembly 20 and preventing unnecessary deformation during operation. Simultaneously, it prevents the reinforcing structure 40 from excessively occupying the accommodating space 14, reserving sufficient expansion and contraction margins for the main body 21, and reducing the possibility of potential mechanical damage to the electrode assembly 20. This optimized design significantly improves the structural integrity, operational stability, and long-term reliability of the battery cell 100.

[0077] In some embodiments of this application, such as Figure 1 As shown, the dimension of the shell 10 along the third direction Z is W, and the group margin of the main body 21 along the third direction Z within the receiving space 14 is C, as... Figure 2 As shown, the wall thickness of the second sidewall 132 is M, and the distance from the side of the reinforcing structure 40 facing the corresponding second sidewall 132 to the inner wall surface of the corresponding second sidewall 132 is H. Then [W-(W-2M)*C] / 2≤H<50%W / 2.

[0078] in: The dimension W of the housing 10 along the third direction Z refers to the overall external width of the housing 10 of the battery cell 100 in the third direction Z. This dimension affects the overall package volume of the battery cell 100 and its arrangement density in the battery device 200.

[0079] The group margin C of the main body 21 in the receiving space 14 along the third direction Z refers to the filling coefficient or space utilization rate of the main body 21 of the electrode assembly 20 in the receiving space 14 of the housing 10 along the third direction Z. The setting of this margin C is intended to ensure that the main body 21 has an appropriate clearance in the receiving space 14 to accommodate manufacturing tolerances, electrolyte wetting, and possible expansion of the battery during charging and discharging, while solving the problem of excessive compression or shaking between the main body 21 and the inner wall of the housing 10.

[0080] The wall thickness M of the second sidewall 132 refers to the material thickness of the two second sidewalls 132 of the housing 10. The second sidewall 132 is an important component of the housing 10, and its wall thickness M directly affects the structural strength, sealing performance and overall weight of the battery cell 100 of the housing 10.

[0081] The distance H between the side of the reinforcing structure 40 facing the corresponding second sidewall 132 and the inner wall surface of the corresponding second sidewall 132 refers to the distance between the edge of the reinforcing structure 40 along the third direction Z and the inner wall surface of the adjacent second sidewall 132. This distance H determines the positioning of the reinforcing structure 40 in the third direction Z. A reasonable distance H can ensure that the reinforcing structure 40 supports the main body 21 without interfering with the second sidewall 132, especially when the second sidewall 132 is subject to external constraints.

[0082] The lower limit of the spacing H ensures that the reinforcing structure 40 does not get too close to the second sidewall 132, thus providing sufficient space for the second sidewall 132 when it is subject to external constraints. This solves the problem of unnecessary stress concentration or interference between the reinforcing structure 40 and the second sidewall 132, while ensuring effective support for the main body 21 in the third direction Z. The upper limit of the spacing H limits the reinforcing structure 40 from moving too far away from the second sidewall 132, thus ensuring that the reinforcing structure 40 can effectively support and position the main body 21, preventing excessive swaying or displacement of the main body 21 in the third direction Z within the accommodating space 14.

[0083] The solution proposed in this application solves the spatial coordination problem between the reinforcing structure 40 and the second sidewall 132 by limiting the positioning of the reinforcing structure 40 along the third direction Z. Specifically, the overall dimension W of the shell 10, the wall thickness M of the second sidewall 132, and the group margin C of the main body 21 within the receiving space 14 jointly determine the effective width of the receiving space 14 in the third direction Z and the actual occupied area of ​​the main body 21. The reinforcing structure 40, as a structure integrally formed on the first sidewall 131 and protruding from the inner wall surface, mainly provides support and positioning for the main body 21 within the receiving space 14. By setting the distance H from the side of the reinforcing structure 40 facing the corresponding second sidewall 132 to the inner wall surface of the corresponding second sidewall 132, and limiting it to the range of [W-(W-2M)*C] / 2≤H<50%W / 2, this solution ensures that there is a reasonable and controlled gap between the edge of the reinforcing structure 40 and the inner wall surface of the second sidewall 132. When thermal runaway occurs inside the battery cell 100, the generated high-temperature and high-pressure flue gas can flow directionally to the pressure relief mechanism 32 through the gas guiding path formed by the gap, thereby achieving directional pressure relief.

[0084] In some embodiments, such as Figures 5 to 7 As shown, each first sidewall 131 has multiple reinforcing structures 40, with adjacent reinforcing structures 40 spaced apart.

[0085] in: "Each first sidewall 131 has multiple reinforcing structures 40" means that two or more reinforcing structures 40 are provided on each first sidewall 131 of the battery cell 100. These reinforcing structures 40 retain their integral molding, recessed towards the receiving space 14, and protruding from the inner wall surface of the first sidewall 131. These reinforcing structures 40 are arranged along a first direction X. For example, two, three, or more reinforcing structures 40 may be evenly distributed along the first direction X.

[0086] "Adjacent reinforcing structures 40 are spaced apart" means that there is a certain physical distance between multiple reinforcing structures 40 on the same first sidewall 131; they are not closely connected or overlapping. This spacing helps to achieve a more uniform support distribution on the first sidewall 131 and allows the housing 10 to maintain a certain structural integrity during manufacturing. This spacing can be uniform, meaning the distance between all adjacent reinforcing structures 40 is equal; or it can be non-uniform, with denser reinforcing structures 40 or larger spacing in specific areas depending on the internal stress or deformation characteristics of the electrode assembly 20. For example, the spacing can be achieved by reserving a flat section of the inner wall surface of the first sidewall 131 between the reinforcing structures 40.

[0087] When the battery cell 100 is in operation, the direction of gravity of the electrode assembly 20 is parallel to the second direction Y, and the dimension of the housing 10 along the first direction X is larger than the dimension along the second direction Y, meaning that the main body 21 of the electrode assembly 20 has a relatively large length in the first direction X. In this case, the main body 21 is prone to deformation or sagging along the first direction X under its own gravity. By providing multiple reinforcing structures 40 on each first sidewall 131, and with adjacent reinforcing structures 40 spaced apart, these reinforcing structures 40 can provide multi-point, distributed support and constraint for the main body 21 along the first direction X. This multi-point support mechanism effectively disperses the gravitational load borne by the main body 21, reduces the possibility of local stress concentration that may be caused by a single or few support points, and thus significantly enhances the deformation resistance of the main body 21 in the first direction X. The spaced reinforcing structures 40 not only ensure the uniformity of support, but also provide flexibility for the manufacturing and assembly of the housing 10, while stably fixing the electrode assembly 20, thereby improving the overall structural stability and reliability of the battery cell 100.

[0088] In some embodiments of this application, such as Figure 3 As shown, the distance between the inner wall surface of the first wall 11 and the inner wall surface of the second wall 12 is a, and the group margin of the main body 21 along the first direction X within the accommodating space 14 is A, as... Figure 6 As shown, the distance between two adjacent reinforcing structures 40 is b, then 20%a*A≤b<50%a*A.

[0089] in: The distance 'a' between the inner wall surface of the first wall 11 and the inner wall surface of the second wall 12 refers to the effective internal length of the battery cell 100 housing 10 in the first direction X.

[0090] The group margin A of the main body 21 in the receiving space 14 along the first direction X refers to the proportional relationship between the actual occupied length of the main body 21 of the electrode assembly 20 in the receiving space 14 along the first direction X and the available internal spacing a in that direction, reflecting the degree of filling tightness of the electrode assembly 20 inside the housing 10 or the reserved expansion space.

[0091] The spacing b between two adjacent reinforcing structures 40 refers to the distance between the center lines of two adjacent reinforcing structures 40 arranged along the first direction X on the same first sidewall 131.

[0092] The range 20%a*A ≤ b < 50%a*A provides a quantified design range for the spacing b between adjacent reinforcing structures 40. The lower limit of this range, 20%a*A, prevents the reinforcing structures 40 from becoming too dense, thus resolving the problem of excessively restricting the normal expansion of the electrode assembly 20 or causing localized stress concentration. This also prevents the reinforcing structures 40 from becoming too sparse, thereby effectively providing continuous and uniform support to the main body 21 of the electrode assembly 20 and preventing unnecessary displacement or swaying in the first direction X.

[0093] In some embodiments, along the first direction X, the orthographic projections of at least two of the reinforcing structures 40 on the same first sidewall 131 are at least partially offset. When the battery cell 100 experiences thermal runaway, the gas guiding path inside the battery cell 100 includes, but is not limited to, the gas guiding path along the two first sidewalls 131. The orthographic projections of at least two of the reinforcing structures 40 on the same first sidewall 131 are at least partially offset. While guiding and depressurizing the gas guiding path corresponding to the first sidewall 131, it can block some particulate matter in the high-temperature and high-pressure flue gas, thereby reducing the possibility of the pressure relief mechanism 32 being blocked by particulate matter and improving the reliability of the pressure relief process.

[0094] In some embodiments of this application, such as Figures 1 to 3 As shown, each first sidewall 131 has only one reinforcing structure 40, and the projection of the center point of the reinforcing structure 40 coincides with the projection of the center point of the first sidewall 131 along the second direction Y. The fact that each first sidewall 131 has only one reinforcing structure 40 means that only one independent, integrally formed reinforcing structure 40 is provided on each first sidewall 131. By limiting the number of reinforcing structures 40 to a single one, the mold design and manufacturing process of the housing 10 can be effectively simplified, reducing production complexity and cost. Simultaneously, the coincidence of the projection of the center point of the reinforcing structure 40 with the projection of the center point of the first sidewall 131 along the second direction Y defines the position of this single reinforcing structure 40 on the first sidewall 131. The reinforcing structure 40 can provide balanced and symmetrical support for the electrode assembly 20, allowing the force acting on the first sidewall 131 to be evenly distributed, solving the problem of local stress concentration caused by eccentric support.

[0095] Through the above technical solution, when the battery cell 100 is in operation and the gravity direction of the electrode assembly 20 is parallel to the second direction Y, only one reinforcing structure 40 is provided on each first sidewall 131, and the projection of the center point of the reinforcing structure 40 along the second direction Y coincides with the projection of the center point of the first sidewall 131. This single and centrally located reinforcing structure 40 can provide uniform and concentrated support for the electrode assembly 20, effectively solving the problem of local stress concentration that may be caused by uneven distribution or positional deviation of multiple reinforcing structures 40. At the same time, it simplifies the mold design and manufacturing process of the housing 10 and reduces production costs. This solution optimizes the utilization of internal space while maintaining structural strength, and maintains the stability and reliability of the electrode assembly 20 under a specific gravity direction, thereby improving the overall performance of the battery cell 100.

[0096] According to a second aspect of the embodiments of this application, embodiments of this application also provide a battery device 200, such as... Figure 8 As shown, the battery device 200 includes a battery cell 100 as described above, which is used to store or provide electrical energy.

[0097] In some embodiments of the battery device 200, the housing 10 of the battery cell 100 has a dimension along a first direction X that is larger than its dimension along a second direction Y, and the direction of gravity of the electrode assembly 20 is parallel to the second direction Y when the battery cell 100 is in operation. The larger dimension of the housing 10 along the first direction X indicates that the overall shape of the battery cell 100 has a longer extension in the first direction X and a relatively shorter extension in the second direction Y, and the larger dimension of the housing 10 along the second direction Y is larger than its dimension along a third direction Z. The parallel direction of gravity of the electrode assembly 20 when the battery cell 100 is in operation defines the installation orientation of the battery cell 100 in actual use. When the battery cell 100 is in operation, the direction of gravity acting on its internal electrode assembly 20 remains parallel to the second direction Y of the housing 10. This installation orientation ensures that the direction of gravity acting on the electrode assembly 20 is definite, thus providing a clear force basis for subsequent structural design.

[0098] The housing 10 of the battery cell 100 is designed with a dimension larger along the first direction X than along the second direction Y, and the gravity direction of the electrode assembly 20 is made parallel to the second direction Y in the working state. This allows the reinforcing structure 40 on the first sidewall 131 to directly and effectively bear the gravity of the electrode assembly 20. This enhances the stability of the electrode assembly 20 in the working state of the battery cell 100 and effectively solves the problem of the electrode assembly 20 sagging due to long-term gravity and directly abutting the inner wall surface of the first sidewall 131. This ensures that the air guide path between the main body 21 and the first sidewall 131 remains unobstructed, so as to achieve directional flow and pressure relief of the high-temperature and high-pressure flue gas generated during thermal runaway.

[0099] In some embodiments, such as Figure 8 As shown, the battery device 200 includes a housing and at least one battery cell assembly 101. The battery cell assembly 101 is disposed within the housing. The battery cell assembly 101 includes multiple battery cells 100 as described above. These multiple battery cells 100 are arranged along the third direction Z to form the battery cell assembly 101. The two second sidewalls 132 between adjacent battery cells 100 abut against each other, and the two second sidewalls 132 at both ends of the battery cell assembly 101 along the third direction Z are respectively constrained by the housing. The battery cells 100 are used to store or provide electrical energy. Figure 8 As shown, the box includes a box body 201 and a box cover 202. The box cover 202 closes to the open end of the box body 201. The box body 201 and the box cover 202 close together to form an assembly space 203. Multiple battery cells 100 are arrayed and assembled in the assembly space 203.

[0100] By arranging multiple battery cells 100 as described above along a third direction Z to form a battery cell assembly 101, and ensuring that the second sidewalls 132 of adjacent battery cells 100 abut against each other, while the second sidewalls 132 at both ends of the battery cell assembly 101 are constrained by the housing, the internal pressure is mainly directed towards the direction of the first sidewall 131. Combined with the reinforcing structure 40 of the first sidewall 131 of the battery cell 100 itself, the overall mechanical strength is effectively improved. This design allows the external constraint of the second sidewall 132 to limit its expansion and distribute the pressure to the first sidewall 131 in the event of thermal runaway inside the battery cell 100, while the reinforcing structure 40 of the first sidewall 131 enhances its resistance to deformation, significantly reducing the risk of the housing cracking.

[0101] The battery device 200 achieves coordinated constraint among the individual battery cells 100 through the aforementioned arrangement. When multiple battery cells 100 are closely arranged along the third direction Z, the mutual contact of adjacent second sidewalls 132 forms a continuous constraint surface, and the constraint of the housing on the second sidewalls 132 at both ends further strengthens this effect. This not only improves the overall structural stability of the battery device 200 but also optimizes space utilization, ensuring the reliability of the battery device 200 in high-energy-density applications.

[0102] In practical implementation, the arrangement of the battery cell assembly 101 ensures that the second sidewalls 132 of adjacent battery cells 100 are in close contact, thus forming an effective external constraint when the battery cells 100 are in operation. For example, when the battery cell 100 experiences expansion pressure due to charging / discharging or thermal runaway, the constraint of the second sidewall 132 restricts its outward deformation, causing the pressure to act primarily in the direction of the first sidewall 131. At this time, the integrally formed reinforcing structure 40 on the first sidewall 131 of the battery cell 100 directly abuts against the main body 21 of the electrode assembly 20, providing additional support and effectively resisting the deformation of the first sidewall 131. The spacing between the reinforcing structure 40 and the second sidewall 132 along the third direction Z reduces stress concentration and, at the same time, works synergistically with the constraint of the second sidewall 132, systematically improving the mechanical strength of the first sidewall 131.

[0103] In some embodiments of this application, the battery device 200 includes at least two battery cell assemblies 101, which are arranged along a second direction Y to form a rectangular array of at least two battery cells 101, and are spaced apart from each other.

[0104] in: "At least two battery cell assemblies 101" means that the battery device 200 contains two or more battery cell assemblies 101. Each battery cell assembly 101 is composed of multiple battery cells 100 closely arranged along a third direction Z to form an independent, linear battery module. By employing multiple such modules, the overall capacity and shape of the battery device 200 can be flexibly configured to adapt to different application requirements. For example, two, three, or more battery cell assemblies 101 can be selectively configured according to the required total energy or power.

[0105] "At least two battery cell assemblies 101 are arranged along the second direction Y" means that these individual battery cell assemblies 101 are placed side by side inside the housing along a direction parallel to the thickness direction (second direction Y) of the battery cell 100. This arrangement allows the battery cell assemblies 101 to expand laterally, rather than just extending longitudinally, thereby increasing the overall width of the battery device 200 while maintaining a reasonable length, so as to accommodate more battery cells 100.

[0106] "To arrange at least two battery cells 100 in a rectangular array" means that by arranging multiple battery cell assemblies 101 along the second direction Y as described above, all battery cells 100 inside the battery device 200 ultimately form a two-dimensional, matrix-like or grid-like arrangement. This array distribution can efficiently utilize the internal space of the enclosure, achieve high-density battery integration, and provide a regular layout basis for subsequent electrical connections and thermal management design.

[0107] "The spacing between two adjacent battery cell modules 101" refers to the existence of a certain physical gap or space between adjacent battery cell modules 101 arranged along the second direction Y. This spacing is not a simple gap, but is designed to provide the necessary space for heat dissipation, electrical wiring, structural support or buffering, and possible cooling medium flow channels. The width and form of this spacing can be optimized according to specific heat dissipation requirements, structural strength requirements, and space constraints.

[0108] By arranging at least two battery cell assemblies 101 along the second direction Y and spacing them apart, multiple battery cells 100 are organized into a rectangular array. This layout allows the battery device 200 to effectively expand its capacity while solving the structural and thermal management problems that may arise from a single elongated assembly. Specifically, the battery cells 100 within each battery cell assembly 101 maintain good structural stability in the third direction Z through the contact of their second sidewalls 132 and the constraint of the housing. When multiple such assemblies are arranged along the second direction Y, the reinforcing structure 40 on the first sidewall 131 of the battery cell 100 effectively resists the pressure generated by the expansion of the electrode assembly 20, maintaining the dimensional stability of the battery cell 100 in the second direction Y. Simultaneously, the spacing between adjacent battery cell assemblies 101 provides necessary channels for heat dissipation from the battery cells 100, especially when the battery cells 100 are in operation and generate internal heat. These spacings promote the flow of air or other cooling media, thereby effectively reducing the operating temperature of the battery cells 100 and minimizing localized overheating. This overall array distribution and spacing design enables the battery device 200 to achieve high energy density while also taking into account structural strength and thermal management efficiency, allowing the battery device 200 to operate stably for a long time.

[0109] In some embodiments of this application, the battery cell 100 includes a pressure relief mechanism 32, and both the electrode terminal 31 and the pressure relief mechanism 32 are disposed on the first wall 11, wherein the second wall 12 abuts against the bottom wall of the housing. By jointly disposing of the electrode terminal 31 and the pressure relief mechanism 32 on the first wall 11 of the battery cell 100, the key functional interfaces of the battery cell 100 are concentrated on a single plane, thereby simplifying the overall design and wiring of the battery cell assembly 101. Simultaneously, having the second wall 12 of the battery cell 100 abut against the bottom wall of the housing means that this side wall directly contacts the bottom structure of the housing. This contact can be achieved by the battery cell 100 being placed directly on the bottom wall of the housing by its own weight, or by using additional fasteners (such as clamps or adhesives) to achieve a tight contact.

[0110] In some embodiments of the battery device 200, the battery cell 100 further includes a pressure relief mechanism 32, the electrode terminal 31 is disposed on the first wall 11, the pressure relief mechanism 32 is disposed on the second wall 12, the gravity direction of the electrode assembly 20 is parallel to the second direction Y when the battery cell 100 is in the working state, and the first side wall 131 or the second side wall 132 abuts against the bottom wall of the main body 201.

[0111] The pressure relief mechanism 32 is a safety device used to actively release internal pressure when the internal pressure of the battery cell 100 reaches a preset threshold. The function of the pressure relief mechanism 32 is to prevent the battery casing 10 from expanding, deforming, or rupturing due to excessive internal pressure, thereby reducing the possibility of accidents such as thermal runaway. The pressure relief mechanism 32 can be implemented in various forms. For example, it can be an explosion-proof valve with a preset rupture pressure. When the internal pressure exceeds this pressure, the weak point of the explosion-proof valve will rupture, thereby releasing high-temperature and high-pressure fumes. Alternatively, it can be a reversible exhaust valve that automatically opens to release air when the internal pressure reaches a certain value and automatically closes when the pressure decreases.

[0112] When the internal pressure of the battery cell 100 rises abnormally, the pressure relief mechanism 32 can release the internal pressure in a timely and effective manner. Specifically, when the battery cell 100 generates a large amount of high-temperature and high-pressure flue gas due to uncontrolled internal chemical reactions or external environmental influences, causing the internal pressure to rise continuously and reach the preset activation threshold of the pressure relief mechanism 32, the pressure relief mechanism 32 will be activated. For example, if the pressure relief mechanism 32 is an explosion-proof valve, its weak area will rupture; if it is an exhaust valve, the valve will open automatically. Through the action of the pressure relief mechanism 32, the high-temperature and high-pressure flue gas inside the battery cell 100 can be quickly discharged, thereby effectively reducing the stress borne by the casing 10 and reducing the possibility of irreversible expansion, deformation, or even rupture of the casing 10 due to overpressure.

[0113] In one specific implementation, the pressure relief mechanism 32 of the battery cell 100 can be a circular or elliptical explosion-proof sheet, the edges of which are sealed at a pre-reserved opening on the first wall 11 or the second wall 12 by laser welding or adhesive bonding. This explosion-proof sheet is made of a metal sheet or composite material with a specific thickness and material strength, and its central region or specific area is designed to have lower mechanical strength, forming a preset rupture point. When the internal pressure of the battery cell 100 rises and exceeds the limit that the explosion-proof sheet can withstand, the preset rupture point will preferentially tear or rupture, thereby forming a pressure relief channel, allowing the high-temperature, high-pressure flue gas inside to be rapidly discharged. For example, the pressure relief mechanism 32 can be located in the central region of the first wall 11, on the same wall surface as the electrode terminal 31, but maintaining a safe distance from each other to reduce the impact on the electrode terminal 31 during pressure relief.

[0114] In some embodiments of this application, the battery device 200 includes at least two battery cell assemblies 101, which are arranged along a first direction X to form a rectangular array of multiple battery cells 100. The battery cells 100 are as described above, with one of their first sidewalls 131 abutting against the bottom wall of the housing. Pressure relief mechanisms 32 of adjacent battery cells 100 are positioned opposite each other between adjacent battery cell assemblies 101. The arrangement of at least two battery cell assemblies 101 along the first direction X to form a rectangular array of multiple battery cells 100 means that multiple pre-assembled battery cell assemblies 101 are linearly arranged along the first direction X (e.g., the length direction of the battery cell 100). Each battery cell assembly 101 may already contain battery cells 100 arranged along a third direction Z. Through this two-level arrangement, all the battery cells 100 ultimately form a regular, matrix-like rectangular array within the housing. This arrangement can be achieved by setting guide rails or partitions inside the housing to position each battery cell assembly 101 at a predetermined position in the first direction X; or, multiple battery cell assemblies 101 can be fixed and assembled along the first direction X using a customized bracket or frame structure to form a rectangular array.

[0115] One of the first sidewalls 131 of each battery cell 100 abuts against the bottom wall of the housing, meaning that the battery cell 100 is placed in the housing with its first sidewall 131 (the sidewall opposite along the second direction Y) in direct contact and support with the bottom structure of the housing. This differs from the previous possible placement method where the second sidewall 132 or the first wall 11 / second wall 12 abuts against the bottom wall. The bottom wall of the housing can be designed as a flat surface, on which the battery cell 100 is placed directly, and the first sidewall 131 abuts against the bottom wall by gravity; alternatively, a groove or positioning structure matching the shape of the first sidewall 131 can be provided on the bottom wall of the housing to ensure that the battery cell 100 is placed and abuts in the correct posture.

[0116] Between adjacent battery cell assemblies 101, the pressure relief mechanisms 32 of two adjacent battery cells 100 along the first direction X are arranged opposite each other. This means that the opening direction or pressure relief direction of the respective pressure relief mechanism 32 (used to release pressure when the internal pressure of the battery is too high) of two adjacent battery cells 100 along the first direction X (i.e., the arrangement direction of the assembly) is opposite to each other. For example, if the pressure relief mechanism 32 of one battery cell 100 faces to the left, then the pressure relief mechanism 32 of its adjacent battery cell 100 faces to the right. When designing the battery cell 100, two installation positions for the pressure relief mechanism 32 can be reserved, and the installation direction can be selected according to the arrangement requirements during assembly; or, the battery cell 100 itself may only have one pressure relief mechanism 32, but by rotating adjacent battery cells 100 by 180 degrees, the pressure relief mechanism 32 is arranged to face each other.

[0117] At this time, the electrode terminals 31 of adjacent battery cells 100 in adjacent battery cell assemblies 101 are arranged opposite to each other. That is, in two adjacent groups along the first direction X (i.e., the arrangement direction of the group), the orientation of their respective electrode terminals 31 (for electrical connection of battery cells 100) is opposite to each other. At this time, the pressure relief mechanisms 32 of adjacent battery cells 100 in adjacent battery cell assemblies 101 are arranged opposite to each other. During the pressure relief process, the position of the pressure relief gas source of the battery cell 100 is relatively fixed, which is beneficial to the subsequent layout of fire extinguishing structures.

[0118] In some embodiments, the electrode terminals 31 of adjacent battery cells 100 are arranged opposite each other between adjacent battery cell assemblies 101. The oppositely arranged electrode terminals 31 are close to each other, which facilitates wiring between the battery cells 100 of adjacent battery cell assemblies 101. At this time, the pressure relief mechanisms 32 of adjacent battery cells 100 are arranged opposite each other, reducing the possibility of mutual interference when adjacent battery cells 100 are depressurized, and improving pressure relief efficiency.

[0119] According to a third aspect of the embodiments of this application, embodiments of this application also provide an energy storage device 300. In some embodiments, the energy storage device 300 includes a battery device 200 as described above, that is, the energy storage device 300 uses one battery device 200 or multiple battery devices 200 connected in series, parallel, or in a mixed configuration, such that these battery devices 200 are used to store electrical energy or provide electrical energy. In other embodiments of this application, the energy storage device 300 includes a plurality of battery cells 100 as described above, that is, the energy storage device 300 uses a plurality of battery cells 100 connected in series, parallel, or in a mixed configuration, such that these battery cells 100 are used to store electrical energy or provide electrical energy.

[0120] The energy storage device 300 can be a small, portable device, such as a convenient energy storage battery used for outdoor tourism and camping, or a portable energy storage battery used by street vendors. The energy storage device 300 can also be a large, fixed, high-power industrial-grade device, such as a large energy storage power station used in a power plant. The energy storage device 300 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. The energy storage device 300 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 300 can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. Other examples include independent power supply energy storage cabinets or energy storage containers used on construction sites or in factories, and larger, portable energy storage cabinets or energy storage containers used at large event venues.

[0121] like Figure 9 As shown, the energy storage device 300 provided in the embodiments of this application is preferably an energy storage cabinet, which includes a cabinet 301 and a plurality of battery devices 200, which are stacked and assembled in the cabinet 301.

[0122] In some embodiments, the energy storage device 300 may 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.

[0123] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery cell 100 or each battery device 200 via pipelines for regulating the temperature of the battery cell 100.

[0124] As an example, the main control module can serve as a battery management unit for multiple battery cells 100 or multiple battery devices 200, used to monitor and manage these cells. The main control module can monitor information such as current, voltage, power, or temperature of the multiple battery cells 100 or multiple battery devices 200. For example, it can control the charging and discharging current and voltage of the multiple battery cells 100 or multiple battery devices 200. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0125] As an example, the central control module can serve as the battery management unit of the energy storage device 300, used to monitor and manage the energy storage device 300. The central control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device 300. For example, it can control the charging and discharging current and voltage of the energy storage device 300. 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.

[0126] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., for detecting, alarming, or extinguishing fires in the energy storage device 300.

[0127] As an example, the power distribution module can be used to distribute power to the modules in the energy storage device 300 that require electricity.

[0128] According to a fourth aspect of the embodiments of this application, embodiments of this application also provide an energy storage system. The energy storage system includes an energy conversion system and an energy storage device 300 as described above. The energy conversion system is connected to the energy storage device 300 to convert energy from current input to or output from the energy storage device 300. The battery device 200 in the energy storage device 300 is used to store electrical energy or provide electrical energy.

[0129] In some embodiments, the energy storage system may include one or more energy storage devices 300 and a power converter system (PCS). The power converter system is used to connect the power generation equipment, the power grid, or the load to the energy storage device 300. The power generation equipment generates electrical energy, the energy storage device 300 stores electrical energy, and the power converter system converts the current input to the energy storage device 300 or the current output from the energy storage device 300 into energy. The electrical energy generated by the power generation equipment can be stored in the energy storage device 300 through the power converter system, and the electrical energy stored in the energy storage device 300 can also be output to the load or the power grid through the power converter system. As an example, the power generation equipment may specifically be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. The specific type of power generation equipment is not limited in this application.

[0130] According to a fifth aspect of the embodiments of this application, embodiments of this application also provide a charging network, including charging piles.

[0131] In some embodiments, the charging network further includes an energy storage system as described above, with the charging pile electrically connected to the energy storage system, wherein the battery device 200 of the energy storage device 300 of the energy storage system is used to store electrical energy, or the battery device 200 of the energy storage device 300 is used to provide electrical energy to the charging pile.

[0132] In some other embodiments of this application, the charging network further includes an energy storage device 300 as described above, and the charging pile is electrically connected to the energy storage device 300, wherein the battery device 200 of the energy storage device 300 is used to store electrical energy, or the battery device 200 of the energy storage device 300 is used to provide electrical energy to the charging pile.

[0133] The charging pile may have one or more connectors, which are used to connect to the charging interface of the device to be charged (such as an electric vehicle), so as to replenish the energy storage unit (such as the battery of the electric vehicle) of the device to be charged.

[0134] The above description is merely a preferred embodiment of this application and is 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 by, include: The housing includes a first wall, a second wall, and circumferential sidewalls. The first wall and the second wall are disposed opposite each other at both ends of the circumferential sidewalls along a first direction and together with the circumferential sidewalls to form an accommodating space. The circumferential sidewalls include two first sidewalls opposite each other along a second direction and two second sidewalls opposite each other along a third direction. The two first sidewalls and the two second sidewalls are alternately connected end to end. The dimension of the second sidewalls along the second direction is larger than the dimension of the first sidewalls along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other. An electrode assembly is disposed within the receiving space, the electrode assembly comprising a main body and electrode tabs disposed on the main body; An electrode terminal is disposed on the first wall or the second wall, and the electrode terminal is electrically connected to the electrode tab. Wherein, at least one of the first sidewalls has at least one integrally formed reinforcing structure, the reinforcing structure being recessed toward the receiving space and protruding from the inner wall surface of the first sidewall, and the reinforcing structure being spaced apart from the corresponding second sidewall on both sides along the third direction.

2. The battery cell according to claim 1, characterized in that, Both of the first sidewalls have at least one integrally formed reinforcing structure.

3. The battery cell according to claim 2, characterized in that, Along the second direction, the orthographic projection of the reinforcing structure on one of the first sidewalls at least partially coincides with the orthographic projection of the corresponding reinforcing structure on the other first sidewall.

4. The battery cell according to claim 3, characterized in that, The reinforcing structure abuts against the main body.

5. The battery cell according to claim 4, characterized in that, The reinforcing structure has an insulating coating on the surface facing the main body.

6. The battery cell according to claim 1, characterized in that, Along the second direction, the projection of the outer contour of the reinforcing structure onto the first sidewall has a rectangular shape, and the length direction of the reinforcing structure is parallel to the first direction.

7. The battery cell according to claim 6, characterized in that, The distance between the inner surfaces of the two first sidewalls is L, the group margin of the main body in the second direction within the accommodating space is B, the wall thickness of the first sidewall is m, and the protrusion height of the reinforcing structure from the inner surface of the first sidewall in the second direction is h. Then m≤h<L*(1-B).

8. The battery cell according to claim 6, characterized in that, The distance between the inner wall surface of the first wall and the inner wall surface of the second wall is a, the dimension of the shell along the third direction is W, the group margin of the main body in the accommodating space along the third direction is C, the wall thickness of the second side wall is M, and the total area of ​​the projection of the outer contour of the reinforcing structure along the second direction onto the first side wall is S. Then, 10%a*50%W≤S≤30%a*(W-2M)*C.

9. The battery cell according to claim 6, characterized in that, The size of the shell along the third direction is W, the group margin of the main body in the accommodating space along the third direction is C, the wall thickness of the second sidewall is M, and the distance from the side of the reinforcing structure facing the corresponding second sidewall to the inner wall surface of the corresponding second sidewall is H. Then, [W-(W-2M)*C] / 2≤H<50%W / 2.

10. The battery cell according to any one of claims 1-9, characterized in that, Each of the first sidewalls has a plurality of the reinforcing structures, with adjacent reinforcing structures spaced apart.

11. The battery cell according to claim 10, characterized in that, The distance between the inner wall surface of the first wall and the inner wall surface of the second wall is a, the group margin of the main body in the accommodating space along the first direction is A, and the distance between two adjacent reinforcing structures is b. Then 20%a*A≤b<50%a*A.

12. The battery cell according to claim 10, characterized in that, Along the first direction, the orthographic projections of at least two of the reinforcing structures on the same first sidewall are at least partially offset.

13. The battery cell according to any one of claims 1-9, characterized in that, Each of the first sidewalls has only one of the reinforcing structures, and along the second direction, the projection of the center point of the reinforcing structure coincides with the projection of the center point of the first sidewall.

14. A battery device characterized by comprising: Includes a battery cell as described in any one of claims 1-13, the battery cell being used to store or provide electrical energy.

15. The battery device according to claim 14, characterized in that, The size of the housing of the battery cell along the first direction is greater than the size along the second direction.

16. The battery device of claim 14, wherein, The battery device includes: Box; At least one battery cell assembly is disposed within the housing. The battery cell assembly includes a plurality of battery cells arranged along the third direction to form the battery cell assembly. The two second sidewalls between two adjacent battery cells abut against each other, and the two second sidewalls at both ends of the battery cell assembly along the third direction are respectively abutted by the corresponding sidewalls of the housing.

17. The battery device according to claim 16, characterized in that, The battery cell also includes a pressure relief mechanism; both the electrode terminals and the pressure relief mechanism are disposed on the first wall, and the second wall abuts against the bottom wall of the housing.

18. The battery device according to claim 16, characterized in that, The battery cell also includes a pressure relief mechanism. The electrode terminals are disposed on the first wall, and the pressure relief mechanism is disposed on the second wall. The gravity direction of the electrode assembly is parallel to the second direction when the battery cell is in working state. The first side wall or the second side wall abuts against the bottom wall of the housing.

19. The battery device according to claim 18, characterized in that, The battery device includes at least two battery cell assemblies, which are arranged along the first direction, and the pressure relief mechanisms of adjacent battery cells are arranged opposite to each other between adjacent battery cell assemblies.

20. The battery device according to claim 18, characterized in that, The battery device includes at least two battery cell assemblies, which are arranged along the first direction, with the electrode terminals of adjacent battery cells in adjacent battery cell assemblies being arranged opposite each other.

21. An energy storage device, characterized in that, The energy storage device includes a battery cell as described in any one of claims 1-13, the battery cell being used to store or provide electrical energy; Alternatively, the energy storage device may include a battery device as described in any one of claims 14-20, the battery device being used to store or provide electrical energy.

22. An energy storage system characterized by, include: Energy conversion system; as well as The energy storage device as claimed in claim 21, wherein the energy conversion system is electrically connected to the energy storage device to convert the current input to or output from the energy storage device into energy.

23. A charging network characterized by, Including charging stations; The charging network further includes the energy storage device as described in claim 21, wherein the charging pile is electrically connected to the energy storage device; Alternatively, the charging network may further include the energy storage system as described in claim 22, wherein the charging pile is electrically connected to the energy storage system; The energy storage device is used to provide electrical energy to the charging pile.

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