Single battery and battery pack

Abstract

The embodiment of the utility model relates to the technical field of batteries, and particularly discloses a single battery and a battery pack, and the single battery comprises a shell provided with an accommodating cavity; the electrode assembly is arranged in the accommodating cavity; the top cover is connected to one side, in the first direction, of the shell, and a liquid injection hole is formed in the top cover; the insulating component comprises an insulating main body which is connected to one side, close to the electrode assembly, of the top cover; at least part of the flow guide part is arranged on the side, close to the electrode assembly, of the insulation body, the flow guide part and the insulation body are arranged in a split mode, the flow guide part is fixedly connected with the insulation body, a flow guide cavity is formed in the flow guide part, a first flow guide opening is formed in the flow guide part, the flow guide cavity communicates with the liquid injection hole, and the first flow guide opening communicates with the flow guide cavity and the containing cavity. According to the invention, the liquid injection efficiency of the single battery is ensured, the potential safety hazard of the single battery is reduced, and the safety performance of the single battery is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a single cell battery and a battery pack. Background Technology

[0002] With the rapid development of the new energy industry, secondary batteries with high energy density, long cycle life, and high safety performance have been widely used and developed, and the demand for secondary batteries with larger capacity, greater durability, and enhanced safety is extremely urgent. Safety performance is one of the core performance characteristics of secondary batteries. Therefore, how to improve the safety performance of secondary batteries has become a pressing issue that needs to be addressed. Utility Model Content

[0003] Embodiments of this application provide a single battery cell and a battery pack to improve the safety performance of the single battery cell.

[0004] To address the aforementioned technical problems, embodiments of this application disclose the following technical solutions:

[0005] On one hand, a single-cell battery is provided, having a first orientation, including:

[0006] The housing has a receiving cavity;

[0007] Electrode assembly, disposed within the receiving cavity;

[0008] A top cover, connected to one side of the housing in the first direction, and having an injection port on the top cover; and

[0009] An insulating component, comprising: an insulating body connected to the top cover on the side near the electrode assembly;

[0010] The flow guiding part, at least part of which is disposed on the side of the insulating body near the electrode assembly, is separately disposed from the insulating body and is fixedly connected to the insulating body. A flow guiding cavity is provided inside the flow guiding part, and a first flow guiding port is provided on the flow guiding part. The flow guiding cavity is connected to the liquid injection hole, and the first flow guiding port is connected to the flow guiding cavity and the receiving cavity respectively.

[0011] In addition to one or more of the features disclosed above, or alternatively, the flow guide includes: a connecting portion, which is fixedly connected to the insulating body; and

[0012] The extension extends along a first direction and is connected to the side of the connecting portion near the electrode assembly. The extension surrounds and forms a flow guide cavity with an opening. The opening is located on the side of the extension near the electrode assembly and communicates with the receiving cavity. A first flow guide is opened on the extension. The flow guide also includes a flow blocking portion connected to the side of the extension near the electrode assembly and the flow blocking portion covers the opening.

[0013] In addition to one or more of the features disclosed above, or as an alternative, at least one second flow guide is provided on the flow baffle, the second flow guide being connected to the flow guide cavity and the receiving cavity respectively.

[0014] In addition to one or more of the features disclosed above, or as an alternative, a connecting groove is provided on the side of the insulating body near the top cover, and a through hole is provided on the insulating body, with the connecting groove communicating with the through hole;

[0015] The connecting part is embedded in the connecting groove to fix the connecting part to the insulating body, and at least part of the extension is inserted through the through hole.

[0016] In addition to one or more of the features disclosed above, or as an alternative, the connection is bonded and fixed to the side of the insulating body near the electrode assembly.

[0017] In addition to one or more of the features disclosed above, or as an alternative, a locking groove is provided on the connecting part, and a locking part is provided on the side of the insulating body near the connecting part, the locking part being embedded in the locking groove to fix the connecting part and the insulating body together.

[0018] In addition to one or more of the features disclosed above, or as an alternative, the insulating body is provided with a through hole that connects the flow guiding cavity to the injection hole;

[0019] The connecting part is located on the side of the through hole closer to the electrode assembly, and the outer contour dimension of the connecting part is larger than the contour dimension of the through hole.

[0020] In addition to one or more of the features disclosed above, or as an alternative, it also includes: a plugging element that plugs the injection hole.

[0021] In addition to one or more of the features disclosed above, or alternatively, the hardness of the flow guide is greater than the hardness of the insulating main body.

[0022] On the other hand, a battery pack is further disclosed, which, in addition to one or more of the features disclosed above, or alternatively, includes a housing; and individual cells as described in any of the preceding claims, the individual cells being disposed within the housing.

[0023] One of the above technical solutions has the following advantages or beneficial effects: This application opens a first flow port on the flow guide portion in the insulating component to guide the electrolyte. This ensures the electrolyte injection efficiency of the single cell while reducing the direct impact of the electrolyte on the outermost membrane of the electrode assembly during electrolyte injection. This avoids membrane folding that could cause direct contact between the positive and negative electrodes, leading to a short circuit in the single cell, thus reducing safety hazards and improving the safety performance of the single cell. Furthermore, by separating the flow guide portion from the insulating body, this application facilitates the separate processing of the flow guide portion and the insulating body, improving the overall processing efficiency of the insulating component and reducing costs. Additionally, the fixed connection between the flow guide portion and the insulating body facilitates assembly and assembly, improving the assembly efficiency of the insulating component and consequently improving the overall assembly efficiency of the single cell. Attached Figure Description

[0024] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0025] Figure 1 This is a three-dimensional structural view of a single battery cell provided according to an embodiment of this application;

[0026] Figure 2 This is an exploded structural diagram of a single battery cell provided according to an embodiment of this application;

[0027] Figure 3 This is an exploded structural diagram of the insulating component provided according to a specific embodiment of this application;

[0028] Figure 4 This is an exploded structural diagram of the insulating component provided according to a specific embodiment of this application from another perspective;

[0029] Figure 5 This is a cross-sectional view of the insulating member provided according to a specific embodiment of this application;

[0030] Figure 6 yes Figure 5 A magnified view of a section at point A in the middle;

[0031] Figure 7 This is an exploded structural diagram of the insulating component provided according to a specific embodiment two of this application;

[0032] Figure 8 This is a cross-sectional view of the insulating component provided according to a specific embodiment two of this application;

[0033] Figure 9 yes Figure 8 A magnified view of a section at point B in the middle;

[0034] Figure 10This is an exploded structural diagram of the insulating component provided according to a specific embodiment three of this application;

[0035] Figure 11 This is a cross-sectional view of the insulating component provided according to a specific embodiment three of this application;

[0036] Figure 12 yes Figure 11 A magnified view of a section at point C;

[0037] Figure 13 This is a structural schematic diagram of the insulating component provided according to specific embodiment four of this application;

[0038] Figure 14 An exploded view of the insulating component provided in Specific Embodiment Four of this application;

[0039] Figure 15 This is a structural schematic diagram of the insulating component provided according to specific embodiment five of this application;

[0040] Figure 16 This is an exploded structural diagram of the insulating component provided in specific embodiment five of this application;

[0041] Figure 17 A schematic diagram of the battery pack structure provided in the embodiments of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 100. Single cell battery;

[0044] 110. Shell; 111. Receiving cavity;

[0045] 120. Electrode assembly;

[0046] 130. Top cover; 131. Injection port;

[0047] 140. Insulating component; 141. Insulating body; 1411. Through hole; 1412. Connecting groove; 1413. Locking part; 142. Flow guiding part; 1421. Connecting part; 14211. Locking groove; 1422. Extension part; 14221. Flow guiding cavity; 14222. First flow guiding port; 14223. Opening; 1423. Flow blocking part; 14231. Second flow guiding port;

[0048] 200. Box body;

[0049] 300. Box lid. Detailed Implementation

[0050] To make the objectives, technical solutions, and beneficial effects of this application clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, further illustrates this application. It should be understood that the specific embodiments described in this specification are merely for explaining this application and are not intended to limit it.

[0051] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, 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.

[0053] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being 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 includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0054] Current secondary battery filling processes typically involve injecting electrolyte directly into the battery through injection holes and lower plastic through-holes using injection equipment. However, in actual production, to improve process efficiency and ensure the battery cells are fully filled with electrolyte, higher liquid pressures are usually used for injection. Due to the high injection pressure and the lack of flow obstruction during electrolyte injection, the electrolyte flowing in through the injection holes and lower plastic through-holes directly impacts the positive and negative electrode plates and separator inside the secondary battery, damaging the internal structure and affecting the battery's yield and safety performance. Furthermore, the lower plastic in existing secondary batteries is a one-piece molded structure, which is more difficult and costly to manufacture.

[0055] To address the aforementioned problems, in the embodiments of this application, reference is made to... Figures 1 to 2 This application provides a single-cell battery 100, which has a first direction Z, a second direction X, and a third direction Y that intersect each other in pairs. For example, the single-cell battery 100 has a first direction Z, a second direction X, and a third direction Y that are perpendicular to each other in pairs. Here, "perpendicular" refers to a state where the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°.

[0056] For example, in this application, the first direction Z is the height direction of the single cell 100, the second direction X is the length direction of the single cell 100, and the third direction Y is the width direction of the single cell 100.

[0057] Specifically, the single cell 100 includes: a casing 110, an electrode assembly 120, a top cover 130, and an insulating component 140.

[0058] The housing 110 is provided with a receiving cavity 111; the electrode assembly 120 is disposed in the receiving cavity 111; the top cover 130 is connected to one side of the housing 110 in the first direction Z, and the top cover 130 is provided with a liquid injection hole 131; the insulating member 140 is connected to the side of the top cover 130 near the electrode assembly 120.

[0059] The single cell 100 can be a rechargeable battery, which refers to a single cell that can be recharged after discharge to activate the active materials and continue to be used. For example, the single cell 100 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, or nickel-cadmium battery, but is not limited to these.

[0060] The individual battery cell 100 can be a prismatic battery, a pouch battery, or a battery of other shapes. For example, in this application, the individual battery cell 100 is a square battery.

[0061] The housing 110 may be made of a strong material such as metal, but is not limited to this. For example, the housing 110 described above is made of aluminum profile, but is not limited to this.

[0062] The top cover 130 can be integrally formed with the housing 110, meaning the top cover 130 can serve as the outer wall of the housing 110. The top cover 130 can also be fixedly connected to the housing 110, for example, by welding or other processes, to one end of the housing 110 in the Z-axis direction. This application does not impose specific limitations and can be configured according to actual circumstances. For example, in this application, the top cover 130 and the housing 110 are separate components, and the top cover 130 and the housing 110 are fixed together by welding.

[0063] The insulating component 140 can be made of rubber, silicone, or plastic, but is not limited to these materials.

[0064] The single-cell battery 100 also includes an electrolyte, terminals, and other functional components. The electrolyte can be a conventional electrolyte or a special electrolyte with additives. The electrolyte is used to wet the electrode assembly 120. The electrode assembly 120 is the component in the single-cell battery 100 where electrochemical reactions occur, and there can be one or more electrode assemblies. The electrode assembly 120 is mainly formed by winding or stacking a positive electrode sheet, a separator, and a negative electrode sheet. The portions of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 120, while the portions without active materials constitute the tabs. During the charging and discharging process of the single-cell battery 100, the positive and negative active materials react with the electrolyte, and the tabs and terminals are electrically connected to form a current loop, enabling the single-cell battery 100 to function normally.

[0065] The injection hole 131 can be of any shape. For example, in this application, the injection hole 131 is circular to facilitate processing and shaping.

[0066] In a specific embodiment of this application, refer to Figures 3 to 6 The insulating component 140 includes: an insulating body 141 and a flow guiding portion 142; the insulating body 141 is connected to the top cover 130 on the side near the electrode assembly 120; at least a portion of the flow guiding portion 142 is disposed on the side of the insulating body 141 near the electrode assembly 120, and the flow guiding portion 142 and the insulating body 141 are separately disposed, that is, the flow guiding portion 142 and the insulating body 141 are two separate components, the flow guiding portion 142 is fixedly connected to the insulating body 141, a flow guiding cavity 14221 is provided in the flow guiding portion 142, a first flow guiding port 14222 is provided on the flow guiding portion 142, the flow guiding cavity 14221 is connected to the injection hole 131, and the first flow guiding port 14222 is connected to the flow guiding cavity 14221 and the receiving cavity 111 respectively.

[0067] Understandably, when the single cell 100 is filled with electrolyte, the electrolyte flows from the external filling device to the filling hole 131 of the single cell 100, and then flows to the guiding cavity 14221. Part of the electrolyte in the guiding cavity 14221 flows to the receiving cavity 111 through the guiding part 142 near the electrode assembly 120, and another part of the electrolyte in the guiding cavity 14221 flows to the receiving cavity 111 through the first guiding port 14222, so as to complete the electrolyte injection.

[0068] This application provides a first flow port 14222 on the flow guide portion 142 in the insulating member 140 to guide the electrolyte. This ensures the electrolyte injection efficiency of the single cell 100 while reducing the direct impact of the electrolyte on the outermost separator of the electrode assembly 120 during electrolyte injection. This prevents the separator from folding and causing direct contact between the positive and negative electrodes, which could lead to a short circuit in the single cell 100, thus reducing safety hazards and improving the safety performance of the single cell 100. Furthermore, by separating the flow guide portion 142 from the insulating body 141, this application facilitates the separate processing of the flow guide portion 142 and the insulating body 141, improving the overall processing efficiency of the insulating member 140 and reducing costs. Additionally, the flow guide portion 142 and the insulating body 141 are fixedly connected, facilitating assembly and forming of the insulating member 140, thereby improving the overall assembly efficiency of the single cell 100.

[0069] In one embodiment, the single cell 100 further includes a sealing member (not shown in the figure), which seals the liquid injection hole 131, thereby sealing the single cell 100 as a whole and ensuring the normal use of the single cell 100.

[0070] In one embodiment, reference is made to Figures 3 to 6 The flow guiding portion 142 includes a connecting portion 1421 and an extension portion 1422. The connecting portion 1421 is fixedly connected to the insulating body 141. The extension portion 1422 extends along the first direction Z and is connected to the side of the connecting portion 1421 near the electrode assembly 120. The extension portion 1422 encloses and forms a flow guiding cavity 14221 with an opening 14223. The opening 14223 is located on the side of the extension portion 1422 near the electrode assembly 120 and communicates with the receiving cavity 111. The first flow guiding port 14222 is opened on the extension portion 1422.

[0071] The connecting portion 1421 and the extension portion 1422 can be integrally formed, meaning they are a single, integrated structure. Alternatively, the connecting portion 1421 and the extension portion 1422 can be separately configured and fixedly connected. For example, the extension portion 1422 is fixedly connected to the connecting portion 1421 via a snap-fit ​​or similar process. This application does not impose specific limitations and can be configured according to actual circumstances. For example, in this application, the connecting portion 1421 and the extension portion 1422 are integrally injection molded.

[0072] Understandably, when the single cell 100 is filled with electrolyte, the electrolyte flows from the external filling device to the filling hole 131 of the single cell 100, and then flows to the guiding cavity 14221. Part of the electrolyte in the guiding cavity 14221 flows to the receiving cavity 111 through the opening 14223, and another part of the electrolyte in the guiding cavity 14221 flows to the receiving cavity 111 through the first guiding port 14222, so as to complete the electrolyte injection. This ensures the filling efficiency of the single cell 100 while reducing the direct impact of the electrolyte on the outermost separator of the electrode assembly 120 during filling, thereby avoiding the separator folding and causing direct contact between the positive and negative electrodes, which would lead to a short circuit in the single cell 100. This reduces the safety hazards of the single cell 100 and improves its safety performance.

[0073] In the second specific embodiment of this application, which is a further solution based on the first specific embodiment, in order to ensure the flow-blocking effect of the guide section 142, in this application, refer to Figures 8 to 9 The flow guide 142 also includes a flow deflector 1423, which is connected to the side of the extension 1422 near the electrode assembly 120 and covers the opening 14223.

[0074] The flow-blocking portion 1423 and the extension portion 1422 can be integrally formed, meaning they are a single, integrated structure. Alternatively, the flow-blocking portion 1423 and the extension portion 1422 can be separately configured and fixedly connected. For example, the flow-blocking portion 1423 is fixedly connected to the connecting portion 1421 via a snap-fit ​​or similar process. This application does not impose specific limitations and can be configured according to actual circumstances. For example, in this application, the flow-blocking portion 1423 and the extension portion 1422 are integrally injection molded.

[0075] Understandably, when the single cell 100 is filled with electrolyte, the electrolyte flows from the external filling device to the filling hole 131 of the single cell 100, and then flows to the flow guiding cavity 14221. Since the opening 14223 of the flow guiding cavity 14221 is covered by the flow blocking part 1423, the electrolyte in the flow guiding cavity 14221 is blocked, so as to reduce the direct impact of the electrolyte of the single cell 100 on the outermost diaphragm of the electrode assembly 120 during filling. This avoids the diaphragm from folding and causing direct contact between the positive and negative electrodes, resulting in a short circuit in the single cell 100, reducing the safety hazards of the single cell 100 and improving the safety performance of the single cell 100.

[0076] In the third specific embodiment of this application, it is a further solution based on the second specific embodiment. Specifically, refer to... Figures 10 to 12 The flow-blocking part 1423 is provided with at least one second flow-guiding port 14231. The second flow-guiding port 14231 is connected to the flow-guiding cavity 14221 and the receiving cavity 111 respectively, so that when the single cell 100 is filled with electrolyte, the electrolyte in the flow-guiding cavity 14221 can be blocked by the flow-blocking part 1423, while part of the electrolyte can flow from the second flow-guiding port 14231 to the receiving cavity 111, so as to further ensure the electrolyte filling efficiency of the single cell 100.

[0077] The second flow guide 14231 can be of any shape. For example, in this application, the second flow guide 14231 is circular to facilitate processing and shaping.

[0078] In one embodiment, it is a further solution based on specific embodiment one, specific embodiment two, or specific embodiment three. Specifically, refer to... Figures 3 to 12 The insulating body 141 has a connecting groove 1412 on the side near the top cover 130, and a through hole 1411 is provided on the insulating body 141. The connecting groove 1412 communicates with the through hole 1411. The connecting part 1421 is embedded in the connecting groove 1412 to fix the connecting part 1421 to the insulating body 141. At least part of the extension 1422 passes through the through hole 1411.

[0079] The through hole 1411 can be of any shape. For example, in this application, the through hole 1411 is rectangular to facilitate processing and shaping.

[0080] This application achieves a fixed connection between the current guiding part 142 and the insulating body 141 by cooperating between the connecting part 1421 and the connecting groove 1412, ensuring the stability of the fixed connection between the current guiding part 142 and the insulating body 141, thereby ensuring the overall structural stability of the single cell 100; at the same time, after the single cell 100 is assembled, the top cover 130 further confines the connecting part 1421 within the connecting groove 1412, so as to further ensure the overall structural stability of the single cell 100.

[0081] In the fourth specific embodiment of this application, it is a further solution based on the first, second, or third specific embodiment. Specifically, refer to... Figures 13 to 14 The connecting portion 1421 is bonded and fixed to the insulating body 141 on the side near the electrode assembly 120. For example, the connecting portion 1421 is fixed to the insulating body 141 on the side near the electrode assembly 120 by adhesive bonding or heat fusion, so as to facilitate quick assembly and fixation between the connecting portion 1421 and the insulating body 141, thereby improving the assembly efficiency of the single cell 100.

[0082] In one embodiment, an insulating body 141 has a through hole 1411 that connects the flow guiding cavity 14221 to the liquid injection hole 131. The connecting part 1421 is located on the side of the through hole 1411 near the electrode assembly 120, and the outer contour dimension of the connecting part 1421 is larger than the contour dimension of the through hole 1411. For example, in this application, the maximum dimension of the connecting part 1421 in the second direction X is larger than the maximum dimension of the through hole 1411 in the second direction X, and the maximum dimension of the connecting part 1421 in the third direction Y is larger than the maximum dimension of the through hole 1411 in the third direction Y, so as to ensure the fixed connection and limiting effect between the connecting part 1421 and the insulating body 141, thereby ensuring the overall structural stability of the single cell 100.

[0083] In the fifth specific embodiment of this application, it is a further solution formed based on the first, second, or third specific embodiment. Specifically, refer to... Figures 15 to 16 The connecting part 1421 is provided with a locking groove 14211, and the insulating body 141 is provided with a locking part 1413 on the side near the connecting part 1421. The locking part 1413 is embedded in the locking groove 14211 to fix the connecting part 1421 and the insulating body 141, so as to realize the fixed connection between the current guiding part 142 and the insulating body 141, ensure the stability of the fixed connection between the current guiding part 142 and the insulating body 141, and thus ensure the overall structural stability of the single cell 100.

[0084] The locking part 1413 and the insulating body 141 can be integrally formed, meaning they are a single, integrated structure. Alternatively, the locking part 1413 and the insulating body 141 can be separately configured and fixedly connected. For example, the locking part 1413 is fixedly connected to the insulating body 141 using a snap-fit ​​or similar process. This application does not impose specific limitations and can be configured according to actual circumstances. For example, in this application, the locking part 1413 and the insulating body 141 are integrally injection molded.

[0085] In one embodiment, the hardness of the flow guide 142 is greater than that of the insulating body 141. The flow guide 142 can be made of a plastic material with greater hardness to further improve the reliability of the flow guide 142.

[0086] Meanwhile, other technical features in specific embodiment five of this application are the same as those in specific embodiment four above. Since specific embodiment four above has described the features in detail, specific embodiment five of this application will not be described accordingly. For details, please refer to the description in specific embodiment four.

[0087] It should be understood that, in this application, the locking part 1413 may also be provided on the connecting part 1421, and the locking groove 14211 may be formed on the insulating body 141. The connecting part 1421 may also be fixedly connected to the insulating body 141, which should also be regarded as an embodiment of this application.

[0088] On the other hand, in the embodiments of this application, reference is made to... Figure 17 This application also provides a battery pack, including: a housing 200, a single battery 100 as described in any of the above embodiments, and a cover 300; the single battery 100 is disposed inside the housing 200, and the cover 300 is disposed on one side of the housing 200 in the first direction Z to seal the housing 200.

[0089] The battery pack can be a three-tiered system consisting of individual battery cells 100, battery modules, and a battery pack. This means that the individual battery cells 100 are first grouped into battery modules, and then the battery modules are placed inside the housing 200 to form a battery pack. Alternatively, it can be a two-tiered system consisting of individual battery cells 100 and a battery pack, where the individual battery cells 100 are directly housed inside the housing 200 to form a battery pack. No specific limitations are imposed in this application; the design can be tailored to the specific circumstances, as long as it does not affect the effectiveness of this application.

[0090] On the other hand, in embodiments of this application, an electrical device is also provided, including a battery pack as described above, which serves as the power supply for the electrical device. The electrical device may be, but is not limited to, mobile devices (e.g., mobile phones, laptops, etc.), electric vehicles (e.g., pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0091] The above steps are provided only to help understand the method, structure, and core ideas of this application. Those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. A single cell having a first direction, characterized by, The application relates to a battery, which comprises a shell provided with a containing cavity, an electrode assembly arranged in the containing cavity, a top cover connected to one side of the shell in a first direction and provided with a liquid injection hole, and an insulation member, which comprises an insulation main body connected to one side of the top cover close to the electrode assembly, a flow guide part arranged at least partially on one side of the insulation main body close to the electrode assembly and fixedly connected to the insulation main body, a flow guide cavity arranged in the flow guide part, a first flow guide hole arranged on the flow guide part, and a flow guide cavity communicated with the liquid injection hole and the containing cavity. The flow guide part comprises a connecting part fixedly connected to the insulation main body, and an extending part extending along the first direction and connected to one side of the connecting part close to the electrode assembly, wherein the extending part encloses the flow guide cavity with an opening, the opening is located on one side of the extending part close to the electrode assembly, the opening is communicated with the containing cavity, the first flow guide hole is arranged on the extending part, and the flow guide part further comprises a flow blocking part connected to one side of the extending part close to the electrode assembly and covering the opening. At least one second flow guide hole is arranged on the flow blocking part and communicated with the flow guide cavity and the containing cavity. One side of the insulation main body close to the top cover is provided with a connecting groove, and a through hole is arranged on the insulation main body and communicated with the connecting groove; The connecting part is embedded in the connecting groove to fixedly connect the connecting part and the insulation main body, and at least part of the extending part penetrates through the through hole. The connecting part is fixed to one side of the insulation main body close to the electrode assembly by bonding or hot melting. A locking part is arranged on one side of the insulation main body close to the connecting part, and the locking part is embedded in a locking groove arranged on the connecting part to fixedly connect the connecting part and the insulation main body.

2. The unit cell of claim 1, wherein, A through hole is arranged on the insulation main body and communicated with the flow guide cavity and the liquid injection hole; The connecting part is located on one side of the through hole close to the electrode assembly, and the outer contour size of the connecting part is larger than the contour size of the through hole.

3. The unit cell of claim 2, wherein, The application further comprises a plugging piece plugged in the liquid injection hole.

4. The unit cell of claim 3, wherein, The hardness of the flow guide part is greater than the hardness of the insulation main body. The application relates to a battery, which comprises a shell provided with a containing cavity, an electrode assembly arranged in the containing cavity, a top cover connected to one side of the shell in a first direction and provided with a liquid injection hole, and an insulation member, which comprises an insulation main body connected to one side of the top cover close to the electrode assembly, a flow guide part arranged at least partially on one side of the insulation main body close to the electrode assembly and fixedly connected to the insulation main body, a flow guide cavity arranged in the flow guide part, a first flow guide hole arranged on the flow guide part, and a flow guide cavity communicated with the liquid injection hole and the containing cavity.

5. The single-cell battery as described in claim 3, characterized in that, ​ 6. The unit cell of claim 3, wherein, ​ 7. The unit cell of any one of claims 5 to 6, wherein, ​ ​ 8. The unit cell of claim 1, wherein, ​ ​ 9. The cell of claim 1 wherein, ​ 10. A battery pack, characterized by, ​ ​ ​ ​

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