Battery cell and energy storage device

Abstract

The utility model relates to the technical field of batteries, and provides a battery monomer and an energy storage device. The battery cell includes: a housing having a first wall surface; the polar column is provided with a first end and a second end which are oppositely arranged, the first end of the polar column is arranged on the first wall surface, the second end of the polar column is arranged outside the shell in an extending manner, and a plurality of inserting parts which are arranged along a preset direction are formed; wherein an insertion gap is formed between two adjacent insertion parts, and the insertion gap can be in insertion fit with an insertion part on a pole of another single battery. And the pole structures of the battery monomers are optimized, so that the poles on the two battery monomers can be matched in an inserting manner. The battery monomers are simple in structure, and the energy storage device manufactured based on the battery monomer grouping mode not only can save a busbar, but also can realize quick disassembly and assembly of the two battery monomers, so that the battery monomer grouping efficiency and the replacement efficiency during maintenance of the single battery monomer are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer and an energy storage device. BACKGROUND

[0002] At present, the battery monomer group is usually connected by busbar welding.

[0003] However, although the busbar can ensure stable electrical performance, it also has obvious shortcomings. For example, false welding and virtual welding are prone to occur when welding the busbar; the welding is an irreversible connection, so it is difficult to maintain and replace the battery monomer after failure, and other components are also prone to be damaged; the cost of busbar procurement, welding equipment and labor is also added, which also increases the overall grouping cost.

[0004] The above statements are only used to provide background technical information related to the present application, and do not necessarily constitute the prior art. CONTENT OF THE UTILITY MODEL

[0005] In view of the above problems, the embodiments of the present application provide a battery monomer and an energy storage device to solve the problems of complex grouping method, inconvenient disassembly and high cost of the battery monomer in the prior art.

[0006] In a first aspect, the embodiments of the present application provide a battery monomer, which comprises:

[0007] a shell having a first wall surface;

[0008] a pole, the pole having a first end and a second end arranged oppositely, the first end of the pole being arranged on the first wall surface, and the second end of the pole extending to the outside of the shell and being formed with a plurality of plug-in parts arranged along a preset direction;

[0009] wherein a plug-in gap is formed between the two adjacent plug-in parts, and the plug-in gap can be plugged and matched with the plug-in part on the pole of another battery monomer.

[0010] In the above technical solution, the pole structure of the battery monomer is optimized, the plug-in parts with a preset arrangement are arranged at the end of the pole, and the plug-in gap is formed between the two adjacent plug-in parts. The poles on the two battery monomers can be plugged and matched by using the plug-in parts and the plug-in gap, so as to realize the electrical connection of the two battery monomers. Based on the grouping method of the battery monomer, the busbar can be omitted, some problems such as cost and false welding caused by the busbar can be solved, the quick disassembly of the two battery monomers can be realized, and the grouping efficiency of the battery monomer and the maintenance and replacement efficiency of the single battery monomer are improved. In addition, since the improved pole structure does not need to set the busbar when the battery monomers are grouped, the space utilization rate and the energy density of the grouped battery monomers are also improved.

[0011] In some embodiments, the plug portion has two abutting surfaces, which are used to abut against the abutting surface of another battery cell;

[0012] The two abutting surfaces are arranged opposite each other in a preset direction; the two abutting surfaces arranged opposite each other between two adjacent insertion parts cooperate to form an insertion gap.

[0013] In the above technical solution, two contact surfaces are formed on a plug part. By using the contact surfaces arranged opposite to each other on both sides of the plug part along a preset direction, the contact surfaces on the terminals of the two battery cells can be quickly aligned when the two battery cells are connected, thereby realizing the rapid assembly of battery cells.

[0014] In some embodiments, the two planes containing the two abutting surfaces intersect at a first intersection line on the side away from the first wall surface, and the first intersection line is parallel to the first wall surface;

[0015] The two contact surfaces, on the side closest to the first wall, intersect the second end face of the pole at a second intersection line, and the second intersection line is parallel to the first wall.

[0016] In the above technical solution, based on the optimization of the contact surface, a "narrow at the top (the part away from the first wall) and wide at the bottom (the part closer to the first wall)" insertion part is formed, and the corresponding insertion gap forms a "wide at the top (the part away from the first wall) and narrow at the bottom (the part closer to the first wall)" structure. When inserting the terminals of two battery cells, the insertion gap facilitates the alignment of the insertion part, and the contact surface on the insertion part can also form a guiding function, further improving assembly efficiency.

[0017] In some embodiments, the plug-in portion is a plate-shaped structure with a preset plate thickness, and the plug-in portions are spaced apart along a preset direction to form a plug-in gap adapted to the preset plate thickness.

[0018] In the above technical solution, the insertion part is designed as a plate-like structure with a preset thickness, which can improve its structural strength. At the same time, the insertion gap can also ensure that the contact surfaces on the poles of the two battery cells are properly engaged.

[0019] In some embodiments, a first mating surface is formed on the side of the plug portion away from the first wall surface; a second mating surface is formed in the portion of the second end face of the pole corresponding to the plug gap;

[0020] The first mating surface abuts against the second mating surface on another battery cell.

[0021] In the above technical solution, a first mating surface is provided on the plug-in part, so that the plug-in part forms a trapezoidal boss structure, and the corresponding plug-in gap forms an inverted trapezoid that matches the plug-in part, thus achieving three-sided mating. While satisfying the strength of the plug-in part, the contact area between the poles is increased.

[0022] In some embodiments, the two abutting surfaces on the plug portion intersect at a first intersection line on the side away from the first wall surface; the two second intersection lines corresponding to the plug gap are collinear at the second end face of the pole post.

[0023] In the above technical solution, the two opposing abutment surfaces intersect on the side away from the first wall, and the abutment surfaces of the two plug-in parts are collinear on the side closer to the first wall, forming a "tooth" structure in the plug-in parts, and a "reverse tooth" gap between adjacent plug-in parts. When plugging the terminals of two battery cells, the plug-in gap facilitates quick alignment of the plug-in parts, and the abutment surfaces on the plug-in parts also provide a guiding function, quickly aligning the plug-in parts with the plug-in gap and engaging them together, thus improving assembly efficiency.

[0024] In some embodiments, any two of the plurality of plug-in portions on the second end face of the same pole post have at least partial overlap in orthographic projection in a first straight line direction, the first straight line direction being parallel to the first wall surface.

[0025] In the above technical solution, the insertion part is designed to be arranged in a straight line or a near-straight line (such as a wavy line), which not only facilitates the processing and manufacturing of the pole, but also facilitates the insertion between the poles of two battery cells, thus improving assembly efficiency.

[0026] In some embodiments, on the second end face of the pole post, the insertion portion is arranged circumferentially along a preset ring.

[0027] In the above technical solution, by arranging the plug-in part along the circumferential direction of the preset ring to form a ring of plug-in parts and corresponding plug-in gaps, the two battery cells that are plugged together have multiple plug-in angles, which makes it easier to turn at appropriate positions when arranging battery cells into a group. The battery cells with this pole structure have stronger versatility.

[0028] In some embodiments, the plug-in portions are arranged at intervals along a circumferential direction;

[0029] The plug-in portion has two abutting surfaces, which are arranged opposite each other in the circumferential direction on both sides of the plug-in portion, for abutting with the abutting surface of the plug-in portion of another battery cell.

[0030] In the above technical solution, by arranging the plug-in part along the circumferential direction of the preset ring, multiple abutting surfaces are formed along the circumferential direction of the preset ring. When the battery cells are grouped together, the two battery cells that are plugged together can have multiple angle plugging methods, which are not limited by the angle of the abutting surface of the plug-in part. This makes it easier to turn at the appropriate position when arranging the battery cells in a group. The battery cells with this pole structure have stronger versatility.

[0031] In some embodiments, the plug portion further has a third mating surface, which is located on the side of the plug portion away from the first wall surface and is parallel to the first wall surface;

[0032] A fourth mating surface is formed in the portion of the second end face of the pole corresponding to the insertion gap;

[0033] The third mating surface abuts against the fourth mating surface on another battery cell.

[0034] In the above technical solution, by setting a third mating surface and a fourth mating surface for contact, the contact area between the terminals of the two battery cells that are inserted together is further increased.

[0035] In some embodiments, the two planes containing the two contact surfaces intersect the axis of the preset ring and are perpendicular to the first wall surface, respectively.

[0036] In the above technical solution, by optimizing the contact surface and the corresponding mating surface, the poles on the two battery cells that are inserted together can be limited in the direction parallel to the first wall surface. That is, the poles of the two battery cells can only slide in the direction perpendicular to the first wall surface, and cannot rotate or move around the preset ring after being inserted.

[0037] In some embodiments, the structures of each connector are identical, and / or the gaps between each connector are identical.

[0038] In the above technical solutions, if the terminals are equipped with the same type of insertion part and insertion gap, their versatility is enhanced. Furthermore, battery cells using this type of terminal have higher insertion efficiency when assembled into batteries, and are easier to process with lower overall costs.

[0039] In some embodiments, the electrode post includes a first electrode post and a second electrode post;

[0040] The first and second poles have opposite polarities and different structures.

[0041] In the above technical solution, differentiating the two terminals on a single battery cell makes it easier for workers to identify the cells when connecting two battery cells in series, and reduces the risk of incorrect installation.

[0042] In some embodiments, the first and second terminals in the same battery cell satisfy at least one of the following conditions:

[0043] The dimensions of the plug portion on the first pole are at least partially different;

[0044] The dimensions of the plug portion on the second pole are at least partially different;

[0045] The number of connectors on the first pole is different from the number of connectors on the second pole;

[0046] The arrangement of the plug-in portions on the first terminal is adapted to the arrangement of the plug-in gaps on the second terminal of the other battery cell, and the arrangement of the plug-in gaps on the first terminal is adapted to the arrangement of the plug-in portions on the second terminal of the other battery cell, so that the first terminal can be plugged into and matched with the second terminal on the other battery cell.

[0047] In the above technical solution, a foolproof design structure is formed by adjusting the size and number of the plug-in parts on the first and / or second poles. When the first and second poles of two battery cells are plugged in, there is only one plug-in position relationship that can make the two plug in properly, thus solving the problem of easy error during series connection.

[0048] In some embodiments, the electrode post includes a first electrode post and a second electrode post with opposite polarities;

[0049] The insertion part of the first pole post is configured as an insertion plate, wherein: the plate body of the insertion plate extends radially along the first axis as the starting point, and the first axis is perpendicular to the first wall surface; a first insertion gap is formed between the included angle of the plates of two adjacent insertion plates;

[0050] The insertion portion of the second pole post is configured as a plug, wherein: the plugs are distributed circumferentially around the second axis, the second axis is perpendicular to the first wall surface; a second insertion gap is formed between two adjacent plugs;

[0051] The insertion plate is adapted to the second insertion gap, and the insertion block is adapted to the first insertion gap; the number of insertion plates is m, and the number of insertion blocks is n, where m and n are both positive integers greater than 2, and m and n satisfy the following conditions:

[0052] n is an integer multiple of m.

[0053] In the above technical solution, the first and second poles are optimized so that the insertion parts on the first pole mate to form an insertion plate radiating radially outward from a first axis. Simultaneously, insertion blocks on the second pole are circumferentially distributed around a second axis, matching the gaps between the insertion plates. The insertion on the first and second poles can also achieve multi-angle mating: when battery cells are grouped together, two battery cells inserted together can have multiple insertion angles, not limited by the angle of the contact surface of the insertion parts. This facilitates turning at appropriate positions when arranging grouped battery cells, and battery cells with this pole structure have greater versatility.

[0054] In some embodiments, the second end of the first pole post is provided with four insert plates, and the included angle between two adjacent insert plates is 90°; the second end of the second pole post is provided with four insert blocks.

[0055] The insert blocks correspond one-to-one with the first insertion gap.

[0056] In the above technical solution, by optimizing the angle and number of the plug-in plates, a "cross-shaped" plug-in structure is formed. At the same time, by adjusting the number and position of the plug blocks, a "cross-shaped" slot is also formed between the plug blocks, which can be arranged at a 90° angle when the batteries are assembled.

[0057] Secondly, embodiments of this application also provide an energy storage device, comprising:

[0058] Multiple battery cells, wherein the battery cells are provided in any one of the embodiments of the first aspect.

[0059] In the above technical solution, by optimizing the terminal structure of the battery cell, a pre-arranged insertion part is provided at the end of the terminal, and an insertion gap is formed between adjacent insertion parts. The insertion parts and the insertion gap cooperate to allow the terminals on two battery cells to be inserted and connected, thereby achieving electrical connection between the two battery cells. Based on this battery cell assembly method, not only can busbars be eliminated, solving some cost and soldering problems caused by busbars, but it also enables rapid assembly and disassembly of two battery cells, improving the efficiency of battery cell assembly and the efficiency of individual battery cell repair and replacement. Furthermore, since the improved terminal structure eliminates the need for busbars when assembling battery cells, it also improves the space utilization and energy density of the assembled battery cells.

[0060] In some embodiments, the housing has a second wall surface opposite to the first wall surface;

[0061] The terminal of one battery cell is inserted into the terminal of another battery cell, wherein: the two second walls of the two battery cells inserted into each other are arranged opposite each other, and the two first walls are arranged opposite each other;

[0062] Energy storage devices also include:

[0063] Two opposing insulating end plates are respectively disposed on the side of the two second walls facing away from the first wall;

[0064] And a flexible connector between the two insulating end plates, used to provide preload for the two battery cells that are plugged together.

[0065] In the above technical solution, the battery cells after assembly are positioned to prevent the terminals of two battery cells inserted together from becoming loose or misaligned, thus improving the situation where the contact area of ​​the corresponding contact surfaces becomes smaller or cannot make contact.

[0066] In some embodiments, the housing has a peripheral sidewall surrounding the first wall surface and the second wall surface;

[0067] The energy storage device also includes: a limiting support component, which is disposed between the peripheral sidewalls of two adjacent battery cells to provide limiting support for the two adjacent battery cells.

[0068] The above technical solution further strengthens the relative positional relationship between the battery cells after assembly, improves the insertion stability between the terminals of the battery cells connected together, and further improves the situation where the insertion part on the terminal is prone to deformation or even damage due to uneven or excessive force. Attached Figure Description

[0069] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0070] Figure 1 A schematic diagram of a battery cell with a linearly arranged connector according to some embodiments of this application;

[0071] Figure 2 A schematic diagram of the pole posts of the linearly arranged plug-in portion provided according to some embodiments of this application. Figure 1 ;

[0072] Figure 3 A schematic diagram of the pole posts of the linearly arranged plug-in portion provided according to some embodiments of this application. Figure 2 ;

[0073] Figure 4 A top view showing the wavy, zigzag arrangement of the connectors according to some embodiments of this application. Figure 1 ;

[0074] Figure 2 A top view showing the wavy, zigzag arrangement of the connectors according to some embodiments of this application. Figure 6 ;

[0075] Figure 7 This is a schematic diagram of a battery cell with the first and second electrodes facing opposite directions, according to some embodiments of this application.

[0076] Figure 8 A schematic diagram of a battery cell with an annularly arranged connector provided according to some embodiments of this application;

[0077] Figure 9 This is a schematic diagram of the pole post of the annularly arranged plug-in portion provided according to some embodiments of this application;

[0078] Figure 10A schematic diagram of a battery cell with a plug-in and plug-in structure according to some embodiments of this application;

[0079] Figure 11 This is a schematic diagram of the pole post of the insert structure provided according to some embodiments of this application;

[0080] Figure 12 This is a schematic diagram of the pole post of the insert structure provided according to some embodiments of this application;

[0081] Figure 13 This is a schematic diagram of the battery cells arranged in a combination of upright and inverted configurations in an energy storage device according to some embodiments of this application;

[0082] Figure 14 This is a schematic diagram of a horizontally arranged battery cell in an energy storage device according to some embodiments of this application;

[0083] Figure 15 This is a schematic diagram of a limiting support member provided when horizontally arranging battery cells according to some embodiments of this application;

[0084] Figures 1-3 This is a schematic diagram of a limiting support provided according to some embodiments of this application.

[0085] The attached figures are labeled as follows:

[0086] 10-Battery cell; 101-Casing; 1011-First wall surface; 1012-Second wall surface; 102-Terminal post; 102A-First terminal post; 102B-Second terminal post; 1021-Plug-in part; 1021A-Plug-in plate; 1021B-Plug-in block; 102C-Second end; 102D-First end; 10211-Abutting surface; 10212-First mating surface; 10213-Third mating surface; 1022-Plug-in gap; 1022A-First plug-in gap; 1022B-Second plug-in gap; 10221-Second mating surface; 10222-Fourth mating surface;

[0087] 20-Limit support component; 201-Suction cup; 202-Insulating post;

[0088] 30 - Insulating end plate;

[0089] 40 - Flexible connector;

[0090] L1 - The axis of the preset ring; L2 - The first axis; L3 - The second axis. Detailed Implementation

[0091] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0092] Unless otherwise defined, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the embodiments of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0093] The term "embodiment" as used in this application means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0094] The specific term "exemplary" used in the embodiments of this application means "serving as an example, embodiment, or illustration." Any embodiment illustrated as "exemplary" is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0095] In the description of the embodiments of this application, the technical terms "first", "second", "third", etc. are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0096] In the description of the embodiments in this application, the technical term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0097] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0098] In the description of the embodiments of this application, the technical terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship in the working state of the embodiments of this application. They are only used to facilitate the description of the embodiments of this application and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0099] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0100] In the description of the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; at the same time, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering.

[0101] In the description of the embodiments of this application, "multiple" means two or more (including two), unless otherwise explicitly specified.

[0102] In the description of the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, and other dimensions of various components in the embodiments of this application shown in the drawings, as well as the overall thickness, length, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0103] Currently, in traditional battery cell assembly methods, busbars are generally used, and welding is employed to achieve electrical connections and assembly between battery cells. As an electrical connection component of a power module, the busbar plays the role of connecting multiple battery cells in parallel within the battery system, and features repeatable electrical performance, low inductive reactance, anti-interference, and high reliability.

[0104] However, this busbar-based battery pack assembly method has some significant limitations. For example, the welding process requires specialized welding equipment and technicians, and strict control of welding parameters is essential. Deviations in any parameter, such as welding temperature, time, or current, can affect welding quality, leading to problems like incomplete or false welds, which in turn affect the electrical connection reliability and overall performance of the battery pack. Furthermore, welding is an irreversible connection method. Once welding is complete, if a battery cell malfunctions later, it is difficult to replace or repair it individually. Often, the entire busbar and related connections need to be dismantled, which not only increases repair difficulty and cost but may also cause unnecessary damage to other healthy battery cells. In addition, the manufacturing and procurement of the busbar itself incurs costs, and the equipment investment, consumables, and labor costs required for the welding process contribute to the high overall assembly cost. Moreover, the presence of the busbar requires additional space in the battery pack's spatial layout, which reduces the space utilization of the battery pack and is detrimental to improving its energy density.

[0105] To address the aforementioned issues, this application provides a battery cell embodiment that optimizes the terminal structure of the battery cell by providing insertion portions with a preset arrangement at the ends of the terminals. Simultaneously, insertion gaps are formed between adjacent insertion portions. The insertion portions and gaps cooperate to allow the terminals on two battery cells to be inserted and connected, thereby achieving electrical connection between the two battery cells. Based on this battery cell assembly method, not only can busbars be eliminated, solving problems such as high cost and poor soldering associated with busbars, but it also enables rapid assembly and disassembly of two battery cells, improving the efficiency of battery cell assembly and the efficiency of individual battery cell repair and replacement. Furthermore, since the improved terminal structure eliminates the need for busbars during battery cell assembly, it improves the space utilization and energy density of the assembled battery cells, better meeting the needs of energy storage systems and other fields for high-performance battery packs.

[0106] The battery cells disclosed in this application can be used, but are not limited to, in energy storage devices.

[0107] For ease of description, this application uses the application of a single battery cell in an energy storage device as an example.

[0108] This application provides an energy storage device that 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 can store electrical energy as needed and output it at appropriate times. For example, the energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours.

[0109] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0110] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0111] In some embodiments, the energy storage device 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.

[0112] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each energy storage device via pipelines to regulate the temperature of individual battery cells.

[0113] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For example, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0114] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0115] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0116] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0117] A battery cluster in an energy storage device can include multiple battery modules. A battery module can contain multiple individual battery cells, which can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cells are connected in both series and parallel configurations. Multiple battery cells can be directly connected in series, parallel, or a combination thereof. Alternatively, an energy storage device can consist of multiple battery cells first connected in series, parallel, or a combination thereof to form battery modules, and then these modules can be connected in series, parallel, or a combination thereof to form a single unit.

[0118] Each battery cell can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell can be cylindrical, flat, cuboid, or other shapes.

[0119] A battery cell is the smallest unit that makes up a battery. A battery cell includes an end cap, a casing, electrode assemblies, and other functional components.

[0120] An end cap is a component that closes onto the opening of a housing to isolate the internal environment of a battery cell from the external environment. The shape of the end cap can be adapted to the shape of the housing to fit it. Optionally, the end cap can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap is less prone to deformation under pressure and impact, allowing the battery cell to have higher structural strength and improved safety performance. Functional components such as electrode terminals can be provided on the end cap. The electrode terminals can be used for electrical connection with electrode assemblies to output or input electrical energy to the battery cell. In some embodiments, the end cap can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell reaches a threshold. The end cap can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating member can also be provided on the inner side of the end cap. The insulating member can be used to isolate the electrical connection components inside the housing from the end cap to reduce the risk of short circuits. Exemplarily, the insulating member can be plastic, rubber, etc.

[0121] The housing is a component used to fit with the end cap to form the internal environment of a battery cell. This internal environment can accommodate electrode components, electrolyte, and other parts. The housing and end cap can be independent components. An opening can be provided on the housing, and the end cap closes the opening to form the internal environment of the battery cell. Alternatively, the end cap and housing can be integrated. Specifically, the end cap and housing can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing, the end cap closes the housing. The housing can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing can be determined according to the specific shape and size of the electrode components. The housing can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application does not impose any special limitations on these materials.

[0122] Electrode assemblies are the components within a single battery cell where electrochemical reactions occur. The casing may contain one or more electrode assemblies. Electrode assemblies are primarily formed by winding or stacking positive and negative electrode plates, typically with a separator between them. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly, while the portions without active material each form a tab. The positive and negative tabs can be located together at one end of the main body or separately at both ends. During charging and discharging, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0123] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings. The technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0124] refer to Figures 7-11 , Figure 1 , Figure 2 A schematic diagram of a battery cell with a linearly arranged connector according to some embodiments of this application; Figure 1 A schematic diagram of the pole posts of the linearly arranged plug-in portion provided according to some embodiments of this application. Figure 3 ; Figure 2 A schematic diagram of the pole posts of the linearly arranged plug-in portion provided according to some embodiments of this application. Figure 7 ; Figure 8 A schematic diagram of a battery cell with an annularly arranged connector provided according to some embodiments of this application; Figure 9 This is a schematic diagram of the pole post of the annularly arranged plug-in portion provided according to some embodiments of this application; Figure 10 A schematic diagram of a battery cell with a plug-in and plug-in structure according to some embodiments of this application; Figure 11 This is a schematic diagram of the pole post of the insert structure provided according to some embodiments of this application;Figure 2 This is a schematic diagram of the pole post of the plug structure provided according to some embodiments of this application.

[0125] In a first aspect, embodiments of this application provide a battery cell 10, which includes a housing 101 and terminals 102.

[0126] The outer casing 101 has a first wall surface 1011. The terminal post 102 has a first end 102D and a second end 102C disposed opposite to each other. The first end 102D of the terminal post 102 is disposed on the first wall surface 1011, and the second end 102C of the terminal post 102 extends to the outside of the outer casing 101 and forms a plurality of insertion portions 1021 arranged in a predetermined direction. An insertion gap 1022 is formed between two adjacent insertion portions 1021, and the insertion gap 1022 can be inserted into and cooperate with the insertion portion 1021 on the terminal post 102 of another battery cell 10. Here, the insertion gap 1022 can be understood as the gap between two adjacent insertion portions 1021 in the predetermined direction, wherein: two adjacent insertion portions 1021 can be completely spaced apart in the predetermined direction, that is, there is no contact between two adjacent insertion portions 1021, such as... Figure 3 As shown; or, adjacent plug-in portions 1021 may be partially spaced apart in a preset direction, meaning that adjacent plug-in portions 1021 may also be in partial contact, such as... Figures 1-6 As shown, two adjacent plug-in portions 1021 in a preset direction are in contact with each other on the side near the second end 102C of the pole post 102, and the other parts of the two plug-in portions 1021 are not in contact.

[0127] The outer casing 101 includes a housing and an end cap. The first wall surface 1011 can be either the end cap or a wall surface of the housing. The electrode post 102 is made of a conductive material, such as copper, copper alloy, aluminum, or aluminum alloy.

[0128] In the above technical solution, by optimizing the structure of the terminal post 102 of the battery cell 10, a plug-in portion 1021 with a preset arrangement is provided on the end face of the second end 102C of the terminal post 102. Based on the preset arrangement, a plug-in gap 1022 is formed between two adjacent plug-in portions 1021. By utilizing the fact that the plug-in portion 1021 of the terminal post 102 can cooperate with the plug-in gap 1022, the terminal posts 102 on the two battery cells 10 can be plugged in and cooperated, thereby realizing the electrical connection between the two battery cells 10.

[0129] Based on this battery cell 10-pack assembly method, not only can the busbar be eliminated, solving some cost and soldering problems caused by the busbar, but it can also realize the rapid assembly and disassembly of two battery cells 10, improving the efficiency of battery cell 10 pack assembly and the efficiency of individual battery cell 10 maintenance and replacement. In addition, since the improved terminal post 102 structure eliminates the need for a busbar when assembling battery cells 10, this will also improve the space utilization and energy density of the battery cell 10 pack.

[0130] refer to Figure 4 , Figure 1 A top view showing the wavy, zigzag arrangement of the connectors according to some embodiments of this application. Figure 5 ; Figure 2 A top view showing the wavy, zigzag arrangement of the connectors according to some embodiments of this application. Figure 6 ; Figures 1-2 This is a schematic diagram of a battery cell with the first and second terminals facing opposite directions, provided according to some embodiments of this application.

[0131] In some embodiments, any two of the plurality of plug portions 1021 on the end face of the second end 102C of the same pole post 102 at least partially overlap in orthographic projection in a first straight line direction, the first straight line direction being parallel to the first wall surface 1011.

[0132] Optionally, such as Figures 4-5 As shown, multiple insertion portions 1021 on the end face 102C of the second end of the same terminal post 102 are arranged along a first straight line direction, which is parallel to the first wall surface 1011. It should be noted that this first straight line direction can be understood as any straight line direction parallel to the first wall surface 1011. This first straight line direction is preset for the convenience of describing the multiple insertion portions 1021 as arranged in a straight line, and its specific arrangement direction can be set according to actual production needs. Of course, when multiple terminals 102 are provided on a single battery cell 10, the insertion portions 1021 on different terminals 102 can be arranged along different straight lines, as long as it satisfies that the terminals 102 of two battery cells 10 connected in series can be interlocked when the battery cells 10 are arranged.

[0133] Alternatively, multiple insertion portions 1021 on the end face of the second end 102C of the same pole post 102 can be arranged in a staggered manner in the first straight line direction, that is, the multiple insertion portions 1021 are distributed in a wavy, zigzag shape on the end face of the second end 102C of the pole post 102, such as... Figures 1-6 As shown. It should be understood that, in the direction perpendicular to the first wall surface 1011, the multiple plug-in portions 1021 on the end face of the second end 102C of the same pole post 102 can also be arranged in a staggered manner, that is, the positions of the multiple plug-in portions 1021 on the side away from the end face of the second end 102C can be inconsistent in the first straight line direction.

[0134] In the above technical solution, by arranging the plug-in portion 1021 in a straight line or an approximately straight line (such as a wavy line), it is not only convenient to process and manufacture the pole post 102, but also convenient to plug the pole posts 102 of two battery cells 10 into each other, thus improving the assembly efficiency.

[0135] If the two terminals 102 are designed with identical structures, the number of insertion parts 1021 can optionally be three, four, five, six, seven, or even more. Correspondingly, the number of insertion gaps 1022 formed can be two, three, four, five, six, or even more. It should be noted that when inserting the insertion part 1021 of the terminal 102 of one battery cell 10 with the insertion gap 1022 on the terminal 102 of another battery cell 10, since the number of insertion parts 1021 and insertion gaps 1022 are unequal, the two battery cells 10 inserted together in the battery pack can be appropriately staggered, that is, the terminals 102 on the two battery cells 10 are partially staggered.

[0136] If the two pole posts 102 are designed with different structures, the spacing, size and number of the plug-in parts 1021 can be adjusted. For example, two adjacent plug-in parts 1021 can be plugged into the plug-in gap 1022 of another pole post 102. This can reduce the processing requirements and improve the problem that some of the contact surfaces 10211 of the two pole posts 102 cannot be properly contacted due to process problems.

[0137] It should be noted that the above description is only an example of the structure of the pole post 102. The specific parameters such as the spacing, size and number of the insertion parts 1021 of the pole post 102 can be determined according to the size of the end face of the second end 102C of the pole post 102 and the total contact area requirement of the two pole posts 102, and will not be elaborated here.

[0138] In some embodiments, such as Figures 1-6 As shown, corresponding abutment surfaces 10211 can be provided on opposite sides of the insertion portion 1021 along the first straight direction. After inserting two battery cells 10, multiple pairs of abutment surfaces 10211 are formed in the first straight direction, and the two are electrically connected by the abutment of multiple pairs of abutment surfaces 10211.

[0139] Optionally, the insertion portion 1021 has two abutment surfaces 10211, which are used to abut with the abutment surface 10211 of another battery cell 10. The two abutment surfaces 10211 on the same insertion portion 1021 are arranged opposite to each other in a first linear direction; the two abutment surfaces 10211 arranged opposite to each other between two adjacent insertion portions 1021 cooperate to form an insertion gap 1022. In the above technical solution, two abutment surfaces 10211 are formed on one insertion portion 1021. By utilizing the abutment surfaces 10211 arranged opposite to each other on both sides of the insertion portion 1021 along the first linear direction, the abutment surfaces 10211 on the terminals 102 of the two battery cells 10 can be quickly aligned when they are connected, thereby achieving rapid assembly of the battery cells 10.

[0140] In addition, more abutment surfaces 10211 can be provided on the opposite sides of the insertion part 1021 along the first straight line direction. As long as the insertion part 1021 on the terminal post 102 of one battery cell 10 is inserted into the insertion gap 1022 on the terminal post 102 of another battery cell 10, the abutment surfaces 10211 of the two battery cells 10 can abut and cooperate with each other.

[0141] In some embodiments, reference Figure 2 The two contact surfaces 10211 on the plug-in part 1021 are optimized to facilitate the quick docking of the terminals 102 on the two battery cells 10.

[0142] Specifically, the two planes on which the two contact surfaces 10211 are located intersect at a first intersection line on the side away from the first wall surface 1011, and the first intersection line is parallel to the first wall surface 1011; the two contact surfaces 10211 intersect at a second intersection line with the end face of the second end 102C of the pole post 102 on the side close to the first wall surface 1011, and the second intersection line is parallel to the first wall surface 1011.

[0143] In the above technical solution, based on the optimization of the abutment surface 10211, a plug-in portion 1021 is formed that is narrow at the top (the part away from the first wall surface 1011) and wide at the bottom (the part close to the first wall surface 1011). Correspondingly, the plug-in gap 1022 forms a structure that is wide at the top (the part away from the first wall surface 1011) and narrow at the bottom (the part close to the first wall surface 1011). When the terminals 102 of two battery cells 10 are plugged in, the plug-in gap 1022 facilitates the alignment of the plug-in portion 1021, and the abutment surface 10211 on the plug-in portion 1021 also provides a guiding function, further improving assembly efficiency.

[0144] In addition, the contact surface 10211 can be moderately polished to ensure that the contact area of ​​the terminals 102 of the two battery cells 10 is fully increased during the quick insertion process.

[0145] Optionally, refer to Figure 2 The insertion part 1021 is a plate-shaped structure with a preset plate thickness, and the insertion parts 1021 are spaced apart along the first straight line direction to form an insertion gap 1022 that matches the preset plate thickness.

[0146] In the above technical solution, by designing the plug-in part 1021 as a plate-shaped structure with a preset thickness, its structural strength can be improved. At the same time, the plug-in gap 1022 can also make the abutment surfaces 10211 on the pole posts 102 of the two battery cells 10 abut and fit in place.

[0147] It should be noted that the specific value of the preset plate thickness can be determined based on the end face of the second end 102C of the pole post 102, the number of plug-in parts 1021 and their spacing, etc., which will not be elaborated here.

[0148] Further, refer to Figure 3 Furthermore, a first mating surface 10212 can be formed on the side of the insertion portion 1021 away from the first wall surface 1011; a second mating surface 10221 is formed in the part of the end face of the second end 102C of the pole post 102 corresponding to the insertion gap 1022; wherein, the first mating surface 10212 abuts against the second mating surface 10221 on the other battery cell 10.

[0149] In the above technical solution, the insertion part 1021 is provided with a first mating surface 10212, which makes the insertion part 1021 form a trapezoidal boss structure. The corresponding insertion gap 1022 forms an inverted trapezoid that is adapted to the insertion part 1021, thus realizing three-sided mating. While satisfying the strength of the insertion part 1021, the contact area between the poles 102 is increased.

[0150] Furthermore, since a first mating surface 10212 is formed on the side of the plug portion 1021 away from the first wall surface 1011, the side of the plug portion 1021 away from the first wall surface 1011 is passivated. This method can also improve the problem that workers are easily punctured or scratched by the plug portion 1021 when disassembling and assembling the battery cell 10.

[0151] Optionally, refer to Figures 7-8 The two abutting surfaces 10211 on the plug-in part 1021 intersect at a first intersection line on the side away from the first wall surface 1011; the two second intersection lines corresponding to the plug-in gap 1022 are collinear at the end face of the second end 102C of the pole post 102.

[0152] In the above technical solution, the two opposing abutment surfaces 10211 intersect on the side away from the first wall surface 1011, and the abutment surfaces 10211 of the two plug-in parts 1021 are collinear on the side close to the first wall surface 1011, so that the plug-in parts 1021 form a "tooth" structure, and a "reverse tooth" gap is formed between two adjacent plug-in parts 1021, that is, a rack structure is formed at the second end 102C of the pole post 102.

[0153] When the terminals 102 of two battery cells 10 are inserted, the insertion gap 1022 facilitates the quick alignment of the insertion parts 1021, and the abutment surface 10211 on the insertion part 1021 also provides a guiding function, quickly engaging the insertion part 1021 with the insertion gap 1022, thus improving assembly efficiency. Furthermore, since there is no gap between adjacent insertion parts 1021 on the side near the first wall surface 1011, compared to the aforementioned design where the insertion part 1021 is a plate-like structure with a preset plate thickness, more insertion parts 1021 can be provided, resulting in more abutment surfaces 10211, further increasing the contact area of ​​the terminals 102 of the two battery cells 10 inserted together.

[0154] refer to Figure 7 , Figure 8 A schematic diagram of a battery cell with an annularly arranged connector provided according to some embodiments of this application; Figures 7-8 This is a schematic diagram of the pole post of the annularly arranged plug-in portion provided according to some embodiments of this application.

[0155] In some embodiments, on the end face of the second end 102C of the terminal post 102, the insertion portion 1021 is arranged circumferentially along a preset ring. When the battery cells 10 are grouped together, a certain number of battery cells 10 are upright, while a certain number of battery cells 10 are inverted. When inserting the upright battery cells 10 and the inverted battery cells 10, they are first arranged in a straight line. After being stacked to the corresponding positions, the insertion angle of the battery cells 10 at the corners can be directly adjusted according to the site requirements.

[0156] In the above technical solution, by arranging the plug portion 1021 along the circumferential direction of the preset ring to form a ring of plug portions 1021 and corresponding plug gaps 1022, the two battery cells 10 plugged together have multiple plug-in methods, which makes it easier to turn at appropriate positions when arranging the battery cells 10 into a group. The battery cells 10 with this pole post 102 structure have stronger versatility.

[0157] Optionally, refer to Figures 7-8The plug-in portions 1021 are arranged at intervals along the circumference; wherein, the plug-in portion 1021 has two abutment surfaces 10211, which are arranged opposite to each other along the circumference on both sides of the plug-in portion 1021 for abutting against the abutment surface 10211 of the plug-in portion 1021 of another battery cell 10.

[0158] In the above technical solution, by arranging the plug-in portion 1021 along the circumferential direction of the preset ring, a plurality of abutment surfaces 10211 are formed along the circumferential direction of the preset ring. When the battery cells 10 are grouped together, the two battery cells 10 that are plugged together can have multiple angle plugging methods, and are not limited by the angle of the abutment surface 10211 of the plug-in portion 1021. This makes it easier to turn at an appropriate position when the battery cells 10 are arranged in a group. The battery cells 10 with this pole post 102 structure have stronger versatility.

[0159] Furthermore, since the insertion portions 1021 are arranged at intervals along the circumferential direction of the preset ring, the insertion portions 1021 have a certain thickness in the circumferential direction. Based on this, the terminals 102 on the two battery cells 10 have a certain supporting strength, which can improve the stability of the insertion and mating of the battery cells 10 inserted together.

[0160] Alternatively, the number of abutment surfaces 10211 of the plug portion 1021 arranged along the circumferential direction of the preset ring can also be increased.

[0161] For example, refer to Figures 7-8 The insertion portion 1021 also has a third mating surface 10213, which is located on the side of the insertion portion 1021 away from the first wall surface 1011 and is parallel to the first wall surface 1011. A fourth mating surface 10222 is formed in the portion of the end face of the second end 102C of the electrode post 102 corresponding to the insertion gap 1022. The third mating surface 10213 abuts against the fourth mating surface 10222 on the other battery cell 10. In the above technical solution, by setting the third mating surface 10213 and the fourth mating surface 10222 to abut against each other, the contact area between the electrodes 102 of the two battery cells 10 inserted together is further increased.

[0162] For example, if the structures of the two pole posts 102 that are plugged together are not completely the same, in addition to both pole posts 102 having the above-mentioned multiple plug-in portions 1021 arranged circumferentially along the preset ring, a fifth mating surface is formed on the side of the plug-in portion 1021 of one pole post 102 near the center of the preset ring, and a cylinder or column is formed on the side of the plug-in portion 1021 of the other pole post 102 near the center of the preset ring. The cylinder or column is inserted into the preset ring so that the outer circumferential surface of the cylinder or column abuts against the fifth mating surface.

[0163] Further optional, refer to Figures 1-8The two planes containing the two contact surfaces 10211 intersect the axis L1 of the preset ring and are perpendicular to the first wall surface 1011. In the above technical solution, by optimizing the contact surfaces 10211 and the corresponding mating surfaces, the pole posts 102 on the two battery cells 10 inserted together can be limited in a direction parallel to the first wall surface 1011. That is, the pole posts 102 of the two battery cells 10 can only slide in a direction perpendicular to the first wall surface 1011, and cannot rotate or move around the preset ring after insertion.

[0164] In some embodiments, reference Figure 12 The battery cell 10 has terminals 102 including a first terminal 102A and a second terminal 102B with opposite polarities.

[0165] If the terminal post 102 adopts the aforementioned insertion portions 1021 arranged in a straight line, or the insertion portions 1021 arranged circumferentially along a preset ring, then each insertion portion 1021 can have the same structure, and each insertion gap 1022 can be the same. In the above technical solution, the terminal post 102 is provided with the same type of insertion portions 1021 and insertion gap 1022, which has stronger versatility. In addition, the battery cell 10 using this type of terminal post 102 has higher insertion efficiency when assembled, and is easier to process and has lower overall cost.

[0166] It should be noted that when the battery cells 10 are assembled into a group, considering factors such as actual site space, the arrangement direction of the battery cells 10 needs to be changed. If "the terminal posts 102 of the battery cells 10 adopt the above-mentioned straight-line arrangement of the insertion parts 1021", it can be optimized by adjusting the arrangement direction of the insertion parts 1021 of either the first terminal post 102A or the second terminal post 102B. For example, the insertion parts 1021 on the first terminal post 102A are still arranged along the first straight line direction, and the insertion parts 1021 on the second terminal post 102B are arranged parallel to the first straight line direction. The second straight line direction of the wall surface 1011 is arranged such that the first straight line direction is perpendicular to the second straight line direction. This means that the arrangement directions of the insertion parts 1021 are perpendicular to each other in a plane parallel to the first wall surface 1011. This allows for the rotational arrangement of two battery cells 10 inserted together, facilitating the installation layout of the energy storage device based on the battery cell 10. It enables a stacked arrangement along three directions in the spatial coordinate system: the X-axis (horizontal direction), the Y-axis (another horizontal direction perpendicular to the X-axis), and the Z-axis (vertical direction). Figures 9-11 As shown.

[0167] If the terminal 102 adopts the aforementioned insertion portion 1021 arranged in a straight line, or the insertion portion 1021 arranged circumferentially along a preset ring, the first terminal 102A and the second terminal 102B in the terminal 102 can have different structures, and the insertion gap 1022 can be adjusted accordingly. In this case, by differentiating the two terminals 102 on a single battery cell 10, it is easier for workers to identify the terminals when connecting two battery cells 10 in series, and it is less likely to be installed incorrectly. For example, the first terminal 102A and the second terminal 102B in the same battery cell 10 must satisfy at least one of the following conditions:

[0168] The dimensions of the plug portion on the first pole post 102A are at least partially different;

[0169] The dimensions of the plug portion on the second pole post 102B are at least partially different;

[0170] The number of connectors on the first pole 102A is different from the number of connectors on the second pole 102B.

[0171] The arrangement of the insertion portions 1021 on the first terminal 102A is adapted to the arrangement of the insertion gaps 1022 on the second terminal 102B of the other battery cell 10, and the arrangement of the insertion gaps 1022 on the first terminal 102A is adapted to the arrangement of the insertion portions 1021 on the second terminal 102B of the other battery cell 10, so that the first terminal 102A can be inserted and mated with the second terminal 102B on the other battery cell 10.

[0172] In the above technical solution, based on the adjustment of the size and number of the insertion part 1021 on the first pole 102A and / or the second pole 102B, a foolproof design structure is formed. When the first pole 102A and the second pole 102B of the two battery cells 10 are inserted, there is only one insertion position relationship that can make the two be inserted in place, thus solving the problem of series connection error.

[0173] refer to Figure 9 , Figure 10 A schematic diagram of a battery cell with a plug-in and plug-in structure according to some embodiments of this application; Figure 11 This is a schematic diagram of the pole post of the insert structure provided according to some embodiments of this application; Figures 9-11 This is a schematic diagram of the pole post of the plug structure provided according to some embodiments of this application.

[0174] In some other alternative embodiments, if the battery cell 10 has a first terminal 102A and a second terminal 102B with opposite polarities and different structures, the first terminal 102A and the second terminal 102B can be constructed with the following specific structures:

[0175] Specifically, when the pole post 102 is configured as the first pole post 102A, the insertion portion 1021 of the pole post 102 is configured as an insertion plate 1021A, wherein: the plate body of the insertion plate 1021A extends radially along the first axis L2, with the first axis L2 being the starting point, and the first axis L2 being perpendicular to the first wall surface 1011; at this time, the insertion gap 1022 corresponds to: the first insertion gap 1022A formed between the plates of two adjacent insertion plates 1021A. When the pole post 102 is configured as the second pole post 102B, the insertion portion 1021 of the pole post 102 is configured as an insertion block 1021B, wherein: the insertion blocks 1021B are circumferentially distributed around the second axis L3, and the second axis L3 is perpendicular to the first wall surface 1011; at this time, the insertion gap 1022 corresponds to: the second insertion gap 1022B formed between two adjacent insertion blocks 1021B. Among them, the insertion plate 1021A is adapted to the second insertion gap 1022B, and the insertion block 1021B is adapted to the first insertion gap 1022A; the number of insertion plates 1021A is m, and the number of insertion blocks 1021B is n, where m and n are both positive integers greater than 2, and m and n satisfy the following condition: n is an integer multiple of m.

[0176] In the above technical solution, the first electrode post 102A and the second electrode post 102B are optimized so that the insertion portions 1021 on the first electrode post 102A cooperate to form an insertion plate 1021A radiating radially outward from the first axis L2. Simultaneously, insertion blocks 1021B are distributed circumferentially on the second electrode post 102B, centered on another second axis L3, to match the gaps between the insertion plates 1021A. The insertion on the first electrode post 102A and the second electrode post 102B can also achieve multi-angle cooperation: when the battery cells 10 are grouped, two battery cells 10 inserted together can have multiple insertion angles, not limited by the angle of the contact surface 10211 of the insertion portion 1021. This facilitates turning at appropriate positions when arranging grouped battery cells 10, making the battery cells 10 with this electrode post 102 structure more versatile.

[0177] Optionally, such as Figure 12 As shown, the second end 102C of the first pole post 102A is provided with four insert plates 1021A, and the included angle between two adjacent insert plates 1021A is 90°; the second end 102C of the second pole post 102B is provided with four insert blocks 1021B; wherein, the insert blocks 1021B correspond one-to-one with the first insertion gap 1022A.

[0178] In the above technical solution, by optimizing the included angle and number of the insertion plate 1021A, a "cross-shaped" insertion structure is formed. Simultaneously, the number and position of the insertion blocks 1021B are adjusted, forming a "cross-shaped" slot between them. This allows for 90° angled arrangement during battery assembly, enabling arrangement in the X, Y, and Z axes of the spatial coordinate system. Figures 12-15 As shown.

[0179] refer to Figure 12 , Figure 13 This is a schematic diagram of the battery cells arranged in a combination of upright and inverted configurations in an energy storage device according to some embodiments of this application; Figure 14 This is a schematic diagram of a horizontally arranged battery cell in an energy storage device according to some embodiments of this application; Figure 15 This is a schematic diagram of a limiting support member provided when horizontally arranging battery cells according to some embodiments of this application; Figures 1-6 This is a schematic diagram of a limiting support provided according to some embodiments of this application.

[0180] Secondly, embodiments of this application also provide an energy storage device, including: a plurality of battery cells 10, wherein the battery cells 10 are any of the battery cells 10 provided in the above embodiments.

[0181] In the above technical solution, by optimizing the structure of the terminal post 102 of the battery cell 10, a plug-in portion 1021 with a preset arrangement is provided at the end of the terminal post 102, and a plug-in gap 1022 is formed between two adjacent plug-in portions 1021. The plug-in portion 1021 and the plug-in gap 1022 cooperate to allow the terminal posts 102 on two battery cells 10 to be plugged in, thereby achieving electrical connection between the two battery cells 10. Based on this battery cell 10 grouping method, not only can the busbar be eliminated, solving some cost and soldering problems caused by the busbar, but it can also achieve rapid assembly and disassembly of two battery cells 10, improving the grouping efficiency of battery cells 10 and the maintenance and replacement efficiency of individual battery cells 10. Furthermore, since the improved terminal post 102 structure eliminates the need for a busbar when assembling battery cells 10, this also improves the space utilization and energy density of the assembled battery cells 10.

[0182] The following description will further illustrate the energy storage device by taking as an example that the battery cell 10 in the energy storage device has two terminals 102 with opposite polarities, and both terminals 102 are located on the first wall surface 1011.

[0183] refer to Figures 12-15 , Figures 13-15In this energy storage device, the outer casing 101 of the battery cell 10 has a second wall 1012 opposite to the first wall 1011; when the terminal post 102 of one battery cell 10 is inserted into the terminal post 102 of another battery cell 10, the two second walls 1012 of the two battery cells 10 inserted into each other are arranged opposite each other and the two first walls 1011 are arranged opposite each other.

[0184] When 10 individual battery cells are grouped together:

[0185] If some battery cells 10 are upright and some battery cells 10 are inverted, when the upright battery cells 10 and the inverted battery cells 10 are inserted together, the weight of the inverted battery cells 10 can be used to increase the friction on the contact surface 10211, thereby maintaining the stability of the insertion state of the two battery cells 10.

[0186] If the battery cell 10 is placed horizontally, the two battery cells 10 inserted together cannot increase the friction between their contact surfaces 10211 through their own weight, thus failing to maintain a stable contact state. In this case, corresponding end plates can be provided in the insertion direction of the two battery cells 10, and connected by connectors to keep the two horizontally placed battery cells 10 in the inserted state. Optionally, the energy storage device further includes: an insulating end plate 30 and an elastic connector 40.

[0187] Specifically, the energy storage device includes two opposing insulating end plates 30, which are respectively disposed on the side of the two second walls 1012 facing away from the first wall 1011; an elastic connector 40 is connected between the two insulating end plates 30 to provide preload for the two battery cells 10 inserted together. Optionally, the elastic connector 40 can be a spring, a spring sheet, or a strap, etc.

[0188] In the above technical solution, the battery cells 10 after assembly are limited so that the terminals 102 of the two battery cells 10 inserted together are not prone to loosening or misalignment, thereby improving the situation where the contact area of ​​the corresponding contact surface 10211 is easily reduced or cannot make contact.

[0189] It should be noted that when the method of "some battery cells 10 are upright and some battery cells 10 are inverted" is adopted, the insulating end plate 30 and the elastic connector 40 can also be set.

[0190] In some embodiments, such as Figures 1-15 As shown, the outer casing 101 has a peripheral sidewall surrounding the first wall surface 1011 and the second wall surface 1012; the energy storage device also includes a limiting support member 20, which is disposed between the peripheral sidewalls of two adjacent battery cells 10, for providing limiting support for the two adjacent battery cells 10.

[0191] In the above technical solution, the relative positional relationship between the battery cells 10 after assembly is further strengthened, which improves the insertion stability between the terminals 102 of the battery cells 10 inserted together, and also further improves the situation where the insertion part 1021 on the terminal 102 is deformed or even damaged due to uneven or excessive force.

[0192] Optionally, the limiting support 20 is detachably connected to the peripheral wall of the battery cell 10. The limiting support 20 can be an insulating post 202 with suction cups 201 at both ends, or an elastic insulating support, etc. Considering that the battery cell 10 is affected by gravity, when two battery cells 10 are prone to relative movement in the direction of gravity, an elastic insulating support can be used as an "elastic pad" to abut against the outer shell 101 of the two battery cells 10, or an "insulating post 202 with suction cups 201 at both ends" can be used to adhere to the outer shell 101 of two adjacent battery cells 10 to fix them relatively. When two battery cells 10 are prone to relative movement in the horizontal direction, an "insulating post 202 with suction cups 201 at both ends" can be used, with the two suction cups 201 adhering to the peripheral wall of the battery cell 10.

[0193] like ​As shown, embodiments of this application also provide a battery cell 10, which includes a housing 101 and terminals 102. The housing 101 has a first wall surface 1011. The terminals 102 are respectively configured as a positive terminal (first terminal 102A) and a negative terminal (second terminal 102B), both of which are disposed on the first wall surface 1011 and have the same structure. For ease of description, the positive terminal and the negative terminal are collectively referred to as terminals. The first end 102D of the terminal 102 is disposed on the first wall surface 1011, and the second end 102C of the terminal 102 forms a plug-in portion 1021. Two abutment surfaces 10211 disposed opposite to each other between adjacent plug-in portions 1021 cooperate to form a plug-in gap 1022. The plug-in gap 1022 can be plugged into the plug-in portion 1021 on the terminal 102 of another battery cell 10. The insertion portion 1021 is arranged along a first straight line parallel to the first wall surface 1011, and the insertion portion 1021 has two abutment surfaces 10211 arranged opposite to each other in the first straight line direction. The abutment surfaces 10211 are used to abut against the abutment surface 10211 of another battery cell 10. The two planes on which the two abutment surfaces 10211 are located intersect at a first intersection line on the side away from the first wall surface 1011, and the first intersection line is parallel to the first wall surface 1011. The two abutment surfaces 10211, on the side close to the first wall surface 1011, intersect with the end face of the second end 102C of the pole post 102 at a second intersection line, and the second intersection line is parallel to the first wall surface 1011. The insertion portion 1021 has a plate-like structure with a preset plate thickness, and the insertion portions 1021 are spaced apart along a first straight line to form an insertion gap 1022 that matches the preset plate thickness, thus forming a trapezoidal insertion portion 1021. Battery cells 10 are inserted into each other through a special arrangement structure formed by the insertion portions 1021 on their respective positive and negative terminals. After insertion, if the battery cells 10 are arranged vertically, the upper battery cell 10 is inverted, and its own weight increases the frictional force between the contact surfaces 10211 of the insertion portions 1021 of the two battery cells 10; if the battery cells 10 are arranged horizontally, in addition to the frictional force between the insertion portions 1021 of the battery cells 10, an insulating end plate 30 and a spring are added to increase the preload between the battery cells 10. When 10 battery cells are grouped together, the series connection of the 10 battery cells is such that the positive terminal of one battery cell 10 is connected to the negative terminal of the next battery cell 10, which allows the voltage of the 10 battery cells to be superimposed. After effectively expanding the capacity according to the on-site layout, the final step is to leave the total positive and total negative interfaces for connection to the client system.

[0194] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0195] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. This application is not limited to the specific embodiments applied herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, The battery cell includes: The outer shell has a first wall surface; The pole has a first end and a second end that are disposed opposite to each other. The first end of the pole is disposed on the first wall surface, and the second end of the pole extends outside the outer shell and forms a plurality of plug-in portions arranged in a preset direction. A connection gap is formed between two adjacent connection portions, and the connection gap can be connected to the connection portion on the terminal post of another battery cell.

2. The battery cell according to claim 1, characterized in that, The insertion part has two abutting surfaces, which are used to abut against the abutting surface of another battery cell; The two abutting surfaces are arranged opposite to each other in the preset direction; the two abutting surfaces arranged opposite each other between two adjacent insertion parts cooperate to form the insertion gap.

3. The battery cell according to claim 2, characterized in that, The two planes containing the two contact surfaces intersect at a first intersection line on the side away from the first wall surface, and the first intersection line is parallel to the first wall surface. The two contact surfaces, on the side closest to the first wall, intersect the second end face of the pole at a second intersection line, and the second intersection line is parallel to the first wall.

4. The battery cell according to claim 3, characterized in that, The insertion part is a plate-shaped structure with a preset plate thickness, and the insertion parts are spaced apart along the preset direction to form an insertion gap that matches the preset plate thickness.

5. The battery cell according to claim 4, characterized in that, A first mating surface is formed on the side of the plug portion away from the first wall surface; a second mating surface is formed on the second end face of the pole corresponding to the plug gap; The first mating surface abuts against the second mating surface on another battery cell.

6. The battery cell according to claim 3, characterized in that, The two abutting surfaces on the plug-in portion intersect at the first intersection line on the side away from the first wall surface; the two second intersection lines corresponding to the plug-in gap are collinear on the second end face of the pole post.

7. The battery cell according to claim 1, characterized in that, Any two of the plurality of insertion portions on the second end face of the same pole post have at least partial overlap in orthographic projection in a first straight line direction, the first straight line direction being parallel to the first wall surface.

8. The battery cell according to claim 1, characterized in that, On the second end face of the pole, the insertion part is arranged circumferentially along a preset ring.

9. The battery cell according to claim 8, characterized in that, The plug-in portions are arranged at intervals along the circumferential direction; The plug portion has two abutting surfaces, which are arranged opposite to each other on both sides of the plug portion in the circumferential direction, for abutting against the abutting surface of the plug portion of another battery cell.

10. The battery cell according to claim 9, characterized in that, The plug portion also has a third mating surface, which is located on the side of the plug portion away from the first wall surface and is parallel to the first wall surface; A fourth mating surface is formed in the portion of the second end face of the pole corresponding to the insertion gap; The third mating surface abuts against the fourth mating surface on another battery cell.

11. The battery cell according to claim 9, characterized in that, The two planes containing the two contact surfaces intersect the axis of the preset ring and are perpendicular to the first wall surface.

12. The battery cell according to any one of claims 1-11, characterized in that, Each of the aforementioned connectors has the same structure, and / or each of the aforementioned connector gaps has the same spacing.

13. The battery cell according to any one of claims 1-11, characterized in that, The pole includes a first pole and a second pole, which have opposite polarities and different structures.

14. The battery cell according to claim 13, characterized in that, The first terminal and the second terminal in the same battery cell must satisfy at least one of the following conditions: The dimensions of the insertion portion on the first pole post are at least partially different; The dimensions of the insertion portion on the second pole are at least partially different; The number of plug-in parts on the first pole post is different from the number of plug-in parts on the second pole post; The arrangement order of the insertion portions on the first terminal post is adapted to the arrangement order of the insertion gaps on the second terminal post of the other battery cell, and the arrangement order of the insertion gaps on the first terminal post is adapted to the arrangement order of the insertion portions on the second terminal post of the other battery cell, so that the first terminal post can be inserted and mated with the second terminal post of the other battery cell.

15. The battery cell according to claim 1, characterized in that, The poles include a first pole and a second pole with opposite polarities; The insertion portion of the first pole post is configured as an insertion plate, wherein: the plate body of the insertion plate extends radially along the first axis as the starting point, and the first axis is perpendicular to the first wall surface; a first insertion gap is formed between the included angle of the plates of two adjacent insertion plates; The insertion portion of the second pole post is configured as a plug, wherein: the plugs are distributed circumferentially around a second axis, the second axis being perpendicular to the first wall surface; a second insertion gap is formed between two adjacent plugs; Wherein, the insert plate is adapted to the second insertion gap, and the insert block is adapted to the first insertion gap; the number of insert plates is m, and the number of insert blocks is n, where m and n are both positive integers greater than 2, and m and n satisfy the following condition: n is an integer multiple of m.

16. The battery cell according to claim 15, characterized in that, The second end of the first pole post is provided with four insert plates, and the included angle between two adjacent insert plates is 90°; the second end of the second pole post is provided with four insert blocks. The insert block corresponds one-to-one with the first insertion gap.

17. An energy storage device, characterized in that, include: Multiple battery cells, wherein the battery cells are battery cells as described in any one of claims 1 to 16.

18. The energy storage device according to claim 17, characterized in that, The outer casing has a second wall surface opposite to the first wall surface; The terminal of one battery cell is inserted into the terminal of another battery cell, wherein: the two second walls of the two battery cells inserted together are arranged opposite to each other, and the two first walls are arranged opposite to each other; The energy storage device also includes: Two opposing insulating end plates are respectively disposed on the side of the two second walls facing away from the first wall; And an elastic connector connected between the two insulating end plates, for providing preload for the two battery cells that are plugged together.

19. The energy storage device according to claim 18, characterized in that, The outer casing has a peripheral sidewall surrounding the first wall surface and the second wall surface; The energy storage device further includes a limiting support member disposed between the peripheral sidewalls of two adjacent battery cells, for providing limiting support for the two adjacent battery cells.

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