Battery cell, battery device, and electric device

Abstract

The application relates to a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly accommodated in the shell and comprising a main body part and a tab, an end cover assembly, a pressure relief mechanism, a top support located between the main body part and the end cover assembly, the top support comprising a supporting part, a first empty part corresponding to the tab and a second empty part corresponding to the pressure relief mechanism, the second empty part extending from one side edge of the top support to the opposite side edge in the width direction of the top support, the surface of the supporting part facing the main body part in the thickness direction of the top support being arranged closer to the main body part than the surface of the first empty part facing the main body part, and at least one side of the first empty part being provided with the supporting part in the length direction of the top support. Therefore, the supporting part can be formed on the side of the tab, the contact area between the main body part and the top support is increased, the pressure on the end surface of the main body part is reduced, and the reliability of the battery monomer is improved.

Description

Technical Field

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

[0002] The statements herein are provided only as background information in connection with this application and do not necessarily constitute prior art.

[0003] In inverted battery cells, a top support design is used to increase the contact area between the electrode assembly and the lower plastic layer. However, when the electrode assembly is heavy, the top support in this technology still cannot effectively distribute the weight, which can lead to damage to the electrode plates during vibration or short circuits caused by the tabs inserting into the main body and contacting the electrode plates, thus affecting the reliability of the battery cell. Utility Model Content

[0004] In view of the problem, this application provides a battery cell, a battery device, and an electrical device, which can alleviate the problem that the electrode plates of the electrode assembly are easily damaged during vibration due to the top support not being able to properly distribute the weight, thus affecting the reliability of the battery cell.

[0005] In a first aspect, this application provides a battery cell, comprising:

[0006] The shell has an opening;

[0007] An electrode assembly, housed within a housing, includes a main body and a tab located on one side of the main body;

[0008] An end cap assembly is disposed on the side of the electrode assembly having tabs and closes to the opening; the end cap assembly has a pressure relief mechanism; and

[0009] The top bracket is located between the main body and the end cap assembly. The top bracket includes a support part, a first clearance part and a second clearance part. The first clearance part is provided corresponding to the pole lug, and the second clearance part is provided corresponding to the pressure relief mechanism. Along the width direction of the top bracket, the second clearance part extends from one edge of the top bracket to the opposite edge. Along the thickness direction of the top bracket, the surface of the support part facing the main body is closer to the main body than the surface of the first clearance part facing the main body.

[0010] Along the length of the top support, at least one side of the first clearance section is provided with a support section.

[0011] The aforementioned battery cell, by incorporating a top support including a first clearance portion, prevents the top support from contacting the tabs when the battery cell is inverted, thus reducing the gravitational force exerted by the main body on the tabs. Furthermore, since the first clearance portion is spaced from the main body and cannot bear the weight of the main body, a support portion is provided on at least one side of the first clearance portion. This allows at least one side of the first clearance portion to abut against the main body for reliable support, thereby bearing the weight. This allows the support portion to be positioned as close as possible to the first clearance portion, which cannot bear the weight of the main body, improving the reliability of the first clearance portion in protecting the tabs. Moreover, without affecting the tabs and venting, the lateral space of the first clearance portion is fully utilized, increasing the contact area between the main body of the electrode assembly and the top support. This allows the top support to better distribute the weight, reducing the pressure on the end face of the main body. This reduces the likelihood of the electrode plates being damaged during vibration or the tabs short-circuiting when they insert into the main body and contact the plates, thus improving the reliability of the battery cell.

[0012] In some embodiments, along the length of the top support, the first clearance portion is located on one side of the second clearance portion;

[0013] A support is provided between the first and second clearance sections; and / or

[0014] The first air-cushion section has a support section on the side away from the second air-cushion section.

[0015] Both the first and second clearance sections are spaced apart from the main body and cannot bear the weight of the main body. Therefore, placing the support between them improves the overall weight-bearing capacity of the top support and enhances the reliability of the first clearance section in protecting the tabs and the second clearance section in preventing interference with the top support for pressure relief. The side of the first clearance section furthest from the second clearance section is the side closest to the edge of the top support. Therefore, placing the support on this side allows the edge of the top support to also share the weight, improving the overall weight-bearing capacity of the top support and enhancing the reliability of the first clearance section in protecting the tabs.

[0016] In some embodiments, along the thickness direction of the top support, the support portion located on one side of the first clearance portion is spaced apart from the first clearance portion to form a gap.

[0017] Because of this gap, the first clearance part can be suspended relative to the main body of the top support. This saves material on the top support and also gives the first clearance part a certain degree of elasticity. When subjected to external force, it can buffer the external force and reduce the damage to the tabs that bend around the first clearance part.

[0018] In some embodiments, along the length of the top support, the top support also includes a connecting portion located on the side, the end cap assembly also includes an insulating member, the connecting portion is connected to the insulating member, and a portion of the support extends continuously from the second clearance portion to the connecting portion.

[0019] Since the connecting part is located at the edge of the top support along its length, a support part is provided between the connecting part and the first clearance part. On the one hand, this allows one side of the first clearance part to abut against the main body for reliable support, thereby bearing the weight. On the other hand, the support part is adjacent to the edge of the top support along its length, which allows the edge of the top support to bear the weight, preventing the edge from warping and improving the reliability of the support.

[0020] In some embodiments, along the length direction of the top support, the root width of the electrode tab is D, the preset single-sided misalignment width of the electrode tab is d, the single-sided reserved gap of the electrode tab is h, and the width of the first clearance portion is H.

[0021] Where H = D + 2d + 2h, 6 mm ≤ d ≤ 15 mm, 1 mm ≤ h ≤ 3 mm.

[0022] Based on the root width D of the tab, the preset single-sided misalignment width d of the tab, and the single-sided reserved gap h of the tab, the width H of the first clearance part can be designed as D + 2d + 2h. In this way, not only is the requirement of the first clearance part to accommodate the tab for folding met, reducing the damage to the tab due to insufficient size, but also the extra space on both sides of the tab can be reserved for the design of the support part, increasing the area of ​​the support part and improving the reliability of the support.

[0023] In some embodiments, the top support also includes a transition portion, on the side facing the main body, at least a portion of the first clearance portion is connected to the support portion through the transition portion.

[0024] Because the first clearance portion is spaced apart from the main body portion, and the support portion abuts against the main body portion, a height difference exists between them. By providing a transition portion that connects the first clearance portion at least partially to the support portion, the height difference at the connection point can be mitigated, reducing the generation of sharp points and thus minimizing damage to the electrode tab upon contact. Furthermore, the transition portion also enhances the connection strength between the first clearance portion and the support portion, improving the support reliability of the support portion and the reliability of the first clearance portion in providing clearance to the electrode tab.

[0025] In some embodiments, the transition portion is inclined relative to both the support portion and the first clearance portion.

[0026] In this way, the support section and the first clearance section can be connected by a ramp, which improves the reliability of the connection.

[0027] In some embodiments, along the width direction of the top support, the first clearance portion has a first edge side, the first edge side being the edge of the top support, and the support portion includes a first support portion, the first support portion being disposed on the side of the first clearance portion away from the first edge side, and at least a portion of the first clearance portion being connected to the first support portion through a transition portion.

[0028] Since the first clearance part needs to be relatively long along the length of the top support, the first support part is also relatively long. Therefore, when at least part of the first clearance part is connected to the first support part through the transition part, the connection strength at the connection between the first clearance part and the first support part can be enhanced, thereby improving the support reliability of the first support part and the clearance reliability of the first clearance part for the tab.

[0029] Furthermore, compared to the transition section connecting the first clearance section to the other sides of the support section, the connection between the first clearance section and the first support section provides a higher reliability and enhanced connection strength. Additionally, no transition sections are provided on either side of the first clearance section along the length of the top support. This is because the space on these sides is already small, and a transition section would occupy space along the length of the first clearance section, potentially causing it to come into contact with weak points on the side of the electrode tab in the width direction, thus damaging the electrode tab. Similarly, the transition section would also reduce the size of the support section, decreasing its area and reducing its reliability.

[0030] In some embodiments, along the length of the top support, the transition portion extends continuously from one side edge of the first clearance portion to the opposite side edge; and / or

[0031] The top support also includes a liquid injection circulation section, which is positioned facing the main body and connected to the first clearance section; the transition section is located in the liquid injection circulation section.

[0032] The continuous extension of the transition section ensures that all connection points between the first vent section and the first support section have transition structures, thus further enhancing the connection strength between the first vent section and the first support section, improving the support reliability of the first support section, and the reliability of the first vent section in venting the electrode tabs. The transition section is located within the electrolyte flow section so that it does not obstruct the flow of electrolyte on the side facing the main body.

[0033] In some embodiments, the first clearance portion includes two parts, which are arranged opposite to each other along the width direction of the top support, and a support portion is provided between the two first clearance portions.

[0034] In this way, the space between the two first air-avoidance sections can be fully utilized to increase the area of ​​the support section.

[0035] In some embodiments, support portions are provided on both sides of the second clearance portion along the length direction of the top support.

[0036] Since the second relief section is spaced apart from the main body and cannot bear the weight of the main body, a support section is provided on the side of the second relief section. This allows the side of the second relief section to abut against the main body for reliable support, thus bearing the weight. Therefore, the support section should be placed as close as possible to the second relief section, which cannot bear the weight of the main body. This not only allows the support section to better distribute the weight but also improves the reliability of the second relief section in preventing interference from the top support for pressure relief. Furthermore, the pressure relief mechanism is usually located in the middle of the end cap assembly, and the position of the second relief section corresponds to the pressure relief mechanism. Therefore, the second relief section is also usually located in the middle of the top support. This provides sufficient space on both sides of the second relief section for the support section. Because the support section is located on both sides of the second relief section, the weight distribution on both sides can be better balanced, improving the support reliability of the top support.

[0037] In some embodiments, along the width direction of the top support, the second clearance extends from one edge of the top support to the opposite edge.

[0038] This allows gas to be exhausted from both sides of the top support to the second vent, improving exhaust efficiency.

[0039] In some embodiments, the surface of the support portion facing the main body is positioned closer to the main body than the surface of the second clearance portion facing the main body.

[0040] In this way, the gas inside the battery cell can be vented to the second vent through the gap between the main body and the second vent, and then vented to the outside through the pressure relief mechanism on the end cover assembly, thereby improving the reliability of pressure relief.

[0041] In some embodiments, the support portion forms a first recess on the side facing the end cap assembly, and the first recess is provided with reinforcing ribs.

[0042] The support portion forms a first recess on the side facing the end cap assembly, which can save material of the top bracket, and the structural strength of the support portion can be improved by providing reinforcing ribs in the first recess, so as to achieve reliable support.

[0043] In some embodiments, the reinforcing rib includes a first rib and a second rib, which are intersectingly disposed within the recess.

[0044] This results in the support being structurally reinforced in both intersecting directions, thus comprehensively improving the structural strength of the support.

[0045] In a second aspect, a battery device is provided, comprising the battery cell in any of the above embodiments.

[0046] The aforementioned electrical device, by incorporating a top support including a first clearance portion, prevents the top support from contacting the electrode tabs when the battery cell is inverted, thus reducing the gravitational force exerted by the main body on the electrode tabs. Furthermore, since the first clearance portion is spaced from the main body and cannot bear the weight of the main body, a support portion is provided on at least one side of the first clearance portion. This allows at least one side of the first clearance portion to abut against the main body for reliable support, thereby bearing the weight. This allows the support portion to be positioned as close as possible to the first clearance portion, which cannot bear the weight of the main body, improving the reliability of the first clearance portion in protecting the electrode tabs. Moreover, without affecting the electrode tabs and venting, the lateral space of the first clearance portion is fully utilized, increasing the contact area between the main body of the electrode assembly and the top support. This allows the top support to better distribute the weight, reducing the pressure on the end face of the main body. This reduces the likelihood of the electrode assembly's electrodes being damaged during vibration or the electrode tabs contacting the electrodes and causing short circuits during insertion into the main body, thus improving the reliability of the battery cell.

[0047] In some embodiments, the battery device further includes a housing having a top surface and a bottom surface disposed opposite each other along the direction of gravity, a battery cell disposed within the housing, and an end cap assembly disposed facing the bottom surface.

[0048] In this way, the battery cell can be placed upside down inside the casing, and the top support can reliably abut against the main body of the electrode assembly. Furthermore, due to the first clearance section, the top support does not abut against the tabs, reducing the gravitational force exerted by the main body on the tabs. Moreover, by fully utilizing the lateral space of the first clearance section to set up the support section, the contact area between the main body of the electrode assembly and the top support is increased, allowing the top support to better distribute the weight and reduce the pressure on the end face of the main body. This reduces the likelihood of the electrode plates being damaged during vibration or short circuits caused by the tabs inserting into the main body and contacting the plates, thus improving the reliability of the battery cell.

[0049] Thirdly, an electrical device is also provided, including the battery device in any of the above embodiments.

[0050] The aforementioned electrical device, by incorporating a top support including a first clearance portion, prevents the top support from contacting the electrode tabs when the battery cell is inverted, thus reducing the gravitational force exerted by the main body on the electrode tabs. Furthermore, since the first clearance portion is spaced from the main body and cannot bear the weight of the main body, a support portion is provided on at least one side of the first clearance portion. This allows at least one side of the first clearance portion to abut against the main body for reliable support, thereby bearing the weight. This allows the support portion to be positioned as close as possible to the first clearance portion, which cannot bear the weight of the main body, improving the reliability of the first clearance portion in protecting the electrode tabs. Moreover, without affecting the electrode tabs and venting, the lateral space of the first clearance portion is fully utilized, increasing the contact area between the main body of the electrode assembly and the top support. This allows the top support to better distribute the weight, reducing the pressure on the end face of the main body. This reduces the likelihood of the electrode assembly's electrodes being damaged during vibration or the electrode tabs contacting the electrodes and causing short circuits during insertion into the main body, thus improving the reliability of the battery cell.

[0051] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0052] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0053] Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments.

[0054] Figure 2 This is an exploded structural diagram of a battery according to one or more embodiments.

[0055] Figure 3 This is an exploded structural diagram of a battery cell according to one or more embodiments.

[0056] Figure 4 This is an exploded structural diagram of a battery cell according to one or more other embodiments.

[0057] Figure 5 for Figure 4 The diagram shows the structure of the top support in the battery cell.

[0058] Figure 6 for Figure 4The diagram shows a structural schematic of the top support in a single battery cell from another perspective.

[0059] The reference numerals in the detailed embodiments are as follows:

[0060] Vehicle 1000, battery device 100, housing 10, first part 11, second part 12, battery cell 20, end cap 21, electrode terminal 211, housing 22, electrode assembly 23, main body 231, electrode tab 232, positive electrode tab 2321, negative electrode tab 2322, end cap assembly 24, pressure relief mechanism 241, adapter piece 242, liquid injection hole 243, top bracket 25, support part 251, first support part 2511, second support part 2512, third support part 2513, first clearance part 252, second clearance part 253, connecting part 254, buckle 2541, transition part 255, liquid injection flow part 256, liquid injection blocking part 257, connecting hole 258, first recessed part 259, reinforcing rib 260, first rib 261, second rib 262, controller 200, motor 300. Detailed Implementation

[0061] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0063] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0064] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout 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 herein can be combined with other embodiments.

[0065] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, 1 and / or 2 can represent: 1 existing alone, 1 and 2 existing simultaneously, and 2 existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following associated objects have an "or" relationship.

[0066] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0067] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying 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 the embodiments of this application.

[0068] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0069] A battery cell includes an electrode assembly, which is the component within the battery cell where electrochemical reactions occur. The electrode assembly is mainly formed by winding or stacking positive and negative electrode plates, and typically a separator is placed between the positive and negative electrode plates. 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 constitute a sub-tab. To ensure that large currents can pass through without melting, multiple sub-tabs are stacked together to form the tabs.

[0070] In a conventional upright battery cell, the electrode assembly interacts with the bottom of the casing, and the weight of the electrode assembly is borne by the base plate and the bottom of the casing, with their contact surfaces flush. However, in an inverted battery cell, the electrode assembly is pressed against the lower plastic of the end cap assembly. This not only damages the main body of the electrode assembly, but the tabs, located below the main body, are also subject to the gravity of the main body. Since the tabs are formed by stacking multiple sub-tabs, they are prone to splitting under gravity. The split parts can easily insert into the main body and come into contact with the positive or negative electrode plates inside, causing a short circuit and resulting in poor battery cell reliability.

[0071] To mitigate the aforementioned issues, a top support is added to the battery cell. This top support increases the contact area between the main body of the electrode assembly and the lower plastic layer, thus sharing the weight load on the electrode assembly. However, the contact area between the top support and the main body of the electrode assembly in related technologies is still very small. When the electrode assembly is heavy, the top support still cannot effectively share the weight, increasing the pressure on the end face of the main body. This can lead to damage to the electrode plates during vibration or short circuits caused by the tabs inserting into the main body and contacting the electrode plates, affecting the reliability of the battery cell.

[0072] To alleviate the above situation, this application designs a battery cell, including a housing, an electrode assembly, an end cap assembly, and a top support. The housing has an opening. The electrode assembly includes a main body and a tab located on one side of the main body. The end cap assembly is located on the side of the electrode assembly with the tab and closes to the opening. The end cap assembly has a pressure relief mechanism. The top support is located between the main body and the end cap assembly. The top support includes a support portion, a first clearance portion, and a pressure relief clearance portion. The first clearance portion is disposed corresponding to the tab, and the second clearance portion is disposed corresponding to the pressure relief mechanism. Along the width direction of the top support, the second clearance portion extends from one edge of the top support to the opposite edge. Along the thickness direction of the top support, the surface of the support portion facing the main body is disposed closer to the main body than the surface of the first clearance portion facing the main body. Along the length direction of the top support, at least one side of the first clearance portion has a support portion.

[0073] By incorporating a top support including a first clearance portion, the top support can prevent the battery cell from contacting the tab when inverted, thus reducing the gravitational force exerted by the main body on the tab. Furthermore, since the first clearance portion is spaced from the main body and cannot bear the weight of the main body, a support portion on at least one side of the first clearance portion allows it to abut against the main body for reliable support, thereby bearing the weight. This allows the support portion to be positioned as close as possible to the first clearance portion, which cannot bear the weight of the main body, improving the reliability of the first clearance portion in protecting the tab. Moreover, without affecting the tab and venting, the lateral space of the first clearance portion is fully utilized, increasing the contact area between the main body of the electrode assembly and the top support. This allows the top support to better distribute the weight, reducing the pressure on the end face of the main body. This reduces the likelihood of the electrode assembly's plates being damaged during vibration or the tab inserting into the main body and contacting the plates, causing a short circuit, thus improving the reliability of the battery cell.

[0074] The battery cell of this application is used in batteries to alleviate the problem that the electrode plates of the electrode assembly are easily damaged or short circuits occur when the electrode tabs are inserted into the main body and come into contact with the electrode plates during vibration, which affects the reliability of the battery cell.

[0075] The batteries disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft.

[0076] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0077] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0078] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0079] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0080] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for accommodating the battery cell 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 jointly define the space; alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0081] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0082] Each battery cell 20 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 20 can be cylindrical, flat, cuboid, or other shapes.

[0083] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit that makes up a battery. Figure 3 The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0084] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure and impact, allowing battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 211 can be provided on end cap 21. Electrode terminals 211 can be used for electrical connection with electrode assembly 23 to output or input electrical energy to battery cell 20. In some embodiments, end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0085] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 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 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0086] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 22 may contain one or more electrode assemblies 23. Electrode assembly 23 mainly consists of positive and negative electrode materials, a separator, and a current collector. Specifically, positive electrode material is coated onto the battery output electrode connector to form a positive electrode sheet, and negative electrode material is coated onto the battery output electrode connector to form a negative electrode sheet. The positive and negative electrode sheets are wound or stacked, and a separator is disposed between the positive and negative electrode sheets, thus forming electrode assembly 23. The portions of the positive and negative electrode sheets containing active material constitute the main body 231 of electrode assembly 23, and the portions of the positive and negative electrode sheets without active material each constitute tabs 232. Figure 4 The positive electrode tab 2321 and the negative electrode tab 2322 can be located together at one end of the main body 231 or at both ends of the main body 231 respectively. During the charging and discharging process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 232 connects to the electrode terminal 211 to form a current circuit.

[0087] Figure 4 This is an exploded structural diagram of a battery cell according to one or more other embodiments. Figure 5 for Figure 4 The diagram shows the structure of the top support in the battery cell. (See attached diagram.) Figure 4 and 5This application provides a battery cell 20, including a housing 22, an electrode assembly 23, an end cap assembly 24, and a top support 25. The housing 22 has an opening, and the electrode assembly 23 is housed within the housing 22, including a main body 231 and a tab 232 located on one side of the main body 231. The end cap assembly 24 is disposed on the side of the electrode assembly 23 with the tab 232 and covers the opening, and the end cap assembly 24 has a pressure relief mechanism 241. The top support 25 is located between the main body 231 and the end cap assembly 24, and the top support 25 includes a support portion 251, a first clearance portion 252, and a second clearance portion 253. The first clearance portion 252 is disposed corresponding to the tab 232, and the second clearance portion 253 is disposed corresponding to the pressure relief mechanism 241. Along the width direction of the top support 25, the second clearance portion 252 extends from one edge of the top support 25 to the opposite edge. Along the thickness direction of the top bracket 25, the surface of the support portion 251 facing the main body portion 231 is positioned closer to the main body portion 231 than the surface of the first clearance portion 252 facing the main body portion 231. Specifically, along the length direction of the top bracket 25, the support portion 251 is provided on at least one side of the first clearance portion 252.

[0088] The end cap assembly 24 is a combination of the end cap 21 and other components disposed on the end cap 21. Specifically, the end cap assembly 24 may include the aforementioned pressure relief mechanism 241, and may also include insulating components, adapter pieces 242, etc.

[0089] The support portion 251 of the top bracket 25 refers to a component that can contact the part to provide support. Specifically, the support portion 251 is used to support the electrode assembly 23.

[0090] The first clearance portion 252 is a clearance structure designed to avoid interference between the top support 25 and the electrode tab 232. In the embodiments of this application, since the first clearance portion 252 and the main body portion 231 are spaced apart, interference between the top support 25 and the electrode tab can be avoided by reserving a gap. Specifically, in the embodiments of this application, the electrode tab 232 can be bent around the first clearance portion 252 from the side of the top support 25 facing the main body portion 231 to the side of the top support 25 facing away from the main body portion 231. In this way, the electrode tab 232 can be unobstructed by the top support 25 and further connected to the electrode terminal 211 on the end cap assembly 24 via the adapter 242.

[0091] The second clearance section 253 refers to the clearance structure designed to avoid interference with pressure relief by the top support 25.

[0092] The width direction of the top support 25 is as follows Figure 4As shown in the Y direction, along the width direction of the top support 25, the second vent 252 extends from one side edge of the top support 25 to the opposite side edge, meaning that the second vent 252 penetrates the top support 25 along the width direction of the top support 25. This allows gas to be exhausted from both sides of the top support 25 to the second vent 252, improving exhaust efficiency.

[0093] The thickness direction of the top support 25 is as follows Figure 4 The Z direction shown is also parallel to the height direction of the battery cell 20.

[0094] Along the thickness direction of the top bracket 25, the surface of the support portion 251 facing the main body 231 is positioned closer to the main body 231 than the surface of the first clearance portion 252 facing the main body 231. This means that the surface of the support portion 251 facing the main body 231 is closer to the main body 231 than the surface of the first clearance portion 252 facing the main body 231. When the battery cell 20 is inverted, the support portion 251 can abut against the main body 231, while the first clearance portion 252 is spaced apart from the main body 231, meaning they do not abut against each other.

[0095] It should be noted that, since the distances between the support portion 251 and the first clearance portion 252 facing the main body portion 231 are different, a height difference will be formed on the side of the top bracket 25 facing the main body portion 231. These height differences will cause the support portion 251 to be a protrusion and the first clearance portion 252 to be a groove.

[0096] The length direction of the top support 25 is Figure 4 The X direction shown is also parallel to the width direction of the battery cell 20.

[0097] In this embodiment of the battery cell 20, by providing a top support 25 including a first clearance portion 252, the top support 25 is prevented from contacting the tab 232 when the battery cell 20 is inverted, thus reducing the gravitational force exerted by the main body 231 on the tab 232. Furthermore, since the first clearance portion 252 is spaced from the main body 231 and cannot bear the weight of the main body 231, when at least one side of the first clearance portion 252 is provided with a support portion 251, at least one side of the first clearance portion 252 can abut against the main body 231 for reliable support, thereby bearing the weight. Therefore, the support portion 251 can be positioned as close as possible to the first clearance portion 252, which cannot bear the weight of the main body 231, improving the reliability of the first clearance portion 252 in clearing the tab 232. Furthermore, without affecting the tab 232 and the exhaust, the side space of the first clearance portion 253 is fully utilized, increasing the contact area between the main body portion 231 of the electrode assembly 23 and the top support 25. This allows the top support 25 to better share the weight and reduce the pressure on the end face of the main body portion 231. Consequently, it reduces the likelihood of the electrode plates of the electrode assembly 23 being damaged during vibration or the tab 232 being inserted into the main body portion 231 and coming into contact with the electrode plates, causing a short circuit. This improves the reliability of the battery cell 20.

[0098] Specifically, in the embodiments of this application, the support portion 251 can be disposed as a continuous whole on at least a portion of the outer periphery of the first clearance portion 252 and at least a portion of the outer periphery of the second clearance portion 253, or it can include multiple portions disposed separately from each other on at least a portion of the outer periphery of the first clearance portion 252 and at least a portion of the outer periphery of the second clearance portion 253. When the support portion 251 can be disposed as a continuous whole on at least a portion of the outer periphery of the first clearance portion 252 and at least a portion of the outer periphery of the second clearance portion 253, a larger and continuous support area can be provided, making the support for the main body portion 231 more reliable. When the support portion 251 includes multiple portions disposed separately from each other on at least a portion of the outer periphery of the first clearance portion 252 and at least a portion of the outer periphery of the second clearance portion 253, the support portion 251 can not interfere with the arrangement of structures such as the end cap assembly 24, and the coverage area of ​​the support portion 251 can be increased, making the supporting force on the main body portion 241 more uniform and improving the reliability of the support.

[0099] According to some embodiments of this application, along the width direction of the top support 25, the first clearance portion 252 has a first edge side, the first edge side is the edge of the top support 25, and a support portion 251 is provided on the side of the first clearance portion 252 away from the first edge side.

[0100] The width direction of the top support 25 is Figure 4 The Y direction shown is also parallel to the width direction of the battery cell 20.

[0101] The tab 232 of the electrode assembly 23 extends from the side of the first clearance portion 252 facing the main body portion 231, around the first edge side, to the other side facing away from the main body portion 231. Therefore, the first clearance portion 252 needs to be relatively long along the length direction of the top support 25 to allow the tab 232 to clear space and move around. Conversely, the first clearance portion 252 needs to be relatively small along the width direction of the top support 25 to accommodate the bending of the tab 232 in the thickness direction.

[0102] Therefore, the side of the first clearance portion 252 away from the first edge has a larger space for the support portion 251 to be installed, thus increasing the area of ​​the support portion 251, thereby increasing the contact area between the main body portion 231 of the electrode assembly 23 and the top bracket 25, so that the top bracket 25 can better share the weight and reduce the pressure on the end face of the main body portion 231.

[0103] For ease of explanation, the support portion 251 on the side of the first clearance portion 252 away from the first edge is named the first support portion 2511.

[0104] Specifically, the first support portion 2511 is adjacent to the first clearance portion 252. That is to say, no other part is provided between the first support portion 2511 and the first clearance portion 252. Therefore, the weight-bearing capacity of the top support 25 is further improved, and the reliability of the first clearance portion 252 in clearing the tab 232 is also improved.

[0105] Furthermore, the top support 25 includes two first clearance portions 252, which are arranged opposite to each other along the width direction of the top support 25, and a support portion 251 is provided between the two first clearance portions 252. This support portion 251 can be a first support portion 2511. In this way, the space between the two first clearance portions 252 can be fully utilized, and the area of ​​the support portion 251 can be increased.

[0106] In the embodiments of this application, the top support 25 includes two sets of first clearance portions 252. Each set of first clearance portions 252 includes two first clearance portions 252 spaced apart along the width direction of the top support 25. One set of first clearance portions 252 is disposed corresponding to the positive electrode tab 2321, and the other set of first clearance portions 252 is disposed corresponding to the negative electrode tab 2322. The two sets of first clearance portions 252 are spaced apart along the length direction of the top support 25. A first support portion 2511 is provided between the two first clearance portions 252 in each set of first clearance portions 252.

[0107] According to some embodiments of this application, along the length of the top support 25, the first clearance portion 252 is located on one side of the second clearance portion 253, and a support portion 251 is provided between the first clearance portion 252 and the second clearance portion 253.

[0108] Both the first clearance portion 252 and the second clearance portion 253 are spaced apart from the main body portion 231 and cannot bear the weight of the main body portion 231. Therefore, by placing the support portion 251 between the two, the weight-bearing capacity of the entire top support 25 can be improved, and the reliability of the first clearance portion 252 in clearing the tab 232 and the second clearance portion 253 in preventing the top support 25 from interfering with the pressure relief is improved.

[0109] For ease of explanation, the support 251 located between the first clearance section 252 and the second clearance section 253 is named the second support section 2512.

[0110] Specifically, the second support portion 2512 is adjacent to the first clearance portion 252 and the second clearance portion 253. That is to say, there are no other parts between the second support portion 2512 and the first clearance portion 252, and between the second support portion 2512 and the second clearance portion 253. Therefore, the weight-bearing capacity of the top support 25 is further improved, and the reliability of the first clearance portion 252 in clearing the tab 232 and the second clearance portion 253 in preventing the top support 25 from interfering with the pressure relief is improved.

[0111] It should be noted that when there are multiple first clearance parts 252, a second support part 2512 can be provided between each first clearance part 252 and the second clearance part 253.

[0112] In some other embodiments, a support portion 251 is provided on the side of the first clearance portion 252 away from the second clearance portion 253.

[0113] The side of the first clearance portion 252 away from the second clearance portion 253 is the side close to the edge of the top support 25. Therefore, by providing the support portion 251 on this side, the edge of the top support 25 can also share the weight, thereby improving the overall weight-sharing capacity of the top support 25 and enhancing the reliability of the first clearance portion 252 in protecting the tab 232 from the air gap.

[0114] For ease of explanation, the support portion 251 located on the side of the first clearance portion 252 away from the second clearance portion 253 is named the third support portion 2513.

[0115] Specifically, the third support portion 2513 is adjacent to the first clearance portion 252. That is to say, no other part is provided between the third support portion 2513 and the first clearance portion 252. Therefore, the weight-bearing capacity of the top support 25 is further improved, and the reliability of the first clearance portion 252 in clearing the tab 232 is also improved.

[0116] It should be noted that when there are multiple first clearance sections 252, a third support section 2513 may be provided on the side of each first clearance section 252 away from the second clearance section 253.

[0117] In other embodiments, along the length of the top support 25, the first clearance portion 252 is located on one side of the second clearance portion 253, and a support portion 251 is provided between the first clearance portion 252 and the second clearance portion 253. A support portion 251 is also provided on the side of the first clearance portion 252 away from the second clearance portion 253. Thus, the weight can be shared on both sides of the first clearance portion 252 through the support portions 251.

[0118] According to some embodiments of this application, along the thickness direction of the top support 25, the support portion 251 located on one side of the first clearance portion 252 is spaced apart from the first clearance portion 252 to form a gap A.

[0119] The gap between the support portion 251 located on one side of the first clearance portion 252 and the first clearance portion 252 means that there is a certain misalignment between the support portion 251 located on one side of the first clearance portion 252 and the first clearance portion 252, and the gap formed by this misalignment is called gap A.

[0120] Because of the setting of the gap A, the first clearance part 252 can be suspended relative to the main body of the top support 25. On the one hand, it saves the material of the top support 25, and on the other hand, it also makes the first clearance part 252 have a certain elasticity. When subjected to external force, it can buffer the external force and reduce the damage to the tab 232 that bends around the first clearance part 252.

[0121] According to some embodiments of this application, along the length direction of the top support 25, the top support 25 also includes a connecting portion 254 located on the side, the end cap assembly 24 also includes an insulating member, the connecting portion 254 is connected to the insulating member, the connecting portion 254 is located on one side of the first clearance portion 252, and a support portion 251 is provided between the connecting portion 254 and the first clearance portion 252.

[0122] Since the connecting part 254 is located at the edge of the top support 25 along its length, a support part 251 is provided between the connecting part 254 and the first clearance part 252. On the one hand, this allows one side of the first clearance part 252 to abut against the main body part 231 for reliable support, thereby bearing the weight. On the other hand, the support part 251 is adjacent to the edge of the top support 25 along its length, which allows the edge of the top support 25 to bear the weight, prevents the edge from warping, and improves the reliability of the support.

[0123] Specifically, the support portion 251 is adjacent to the connecting portion 254 and the first clearance portion 252. That is to say, no other parts are provided between the support portion 251, the connecting portion 254 and the first clearance portion 252. Therefore, the load-bearing capacity of the top support 25 is further improved, and the reliability of the first clearance portion 252 in clearing the tab 232 is improved.

[0124] In the embodiments of this application, the connecting portion 254 includes two parts, which are respectively located on both sides of the top support 25 along its length. Each connecting portion 254 is provided with a support portion 251 between itself and the first clearance portion 252.

[0125] It can be understood that the support portion 251 located between the connecting portion 254 and the first clearance portion 252 is the aforementioned third support portion 2513.

[0126] The connecting part 254 specifically includes a snap fastener 2541, which can engage with a slot on the insulating component to achieve a snap-fit ​​connection. The number of snap fasteners 2541 in each connecting part 254 is not limited. Optionally, each connecting part 254 may have two snap fasteners 2541, which are spaced apart from each other along the width direction of the top bracket 25.

[0127] In some embodiments, the connecting portion 254 and the second clearance portion 253 are spaced apart along the length of the top bracket 25, and the first support portion 2511 extends from the connecting portion 254 to the second clearance portion 253. This allows the support portion 251 to provide large-area support to the main body portion 231 along its length, improving the stability of the support.

[0128] Specifically, when both the connecting portion 254 and the first support portion 2511 include two parts, each connecting portion 254 is spaced apart from the second clearance portion 253, and each first support portion 2511 extends from a corresponding connecting portion 254 to the second clearance portion 253. In this way, symmetrical support portions 251 can be formed on both sides of the second clearance portion 253, thereby improving the uniformity of the support and making the support more reliable.

[0129] According to some embodiments of this application, along the length direction of the top support 25, the root width of the electrode 232 is D, the preset single-sided misalignment width of the electrode 232 is d, the single-sided reserved gap of the electrode 232 is h, and the width of the first clearance portion 252 is H.

[0130] Where H = D + 2d + 2h, 6 mm ≤ d ≤ 15 mm, 1 mm ≤ h ≤ 3 mm.

[0131] It is understandable that multiple sub-taps will be formed on the electrode sheet. Therefore, when the electrode sheet is wound or stacked, multiple sub-taps will be stacked together to form a tab 232 of a certain thickness. However, due to process errors or subsequent external forces, a certain misalignment will be formed between each sub-taps along the width direction. The preset single-sided misalignment width is a preset value of misalignment on one side of a tab 232 along the width direction, which is set by the user.

[0132] Therefore, based on the root width D of the tab 232, the preset single-sided misalignment width d of the tab 232, and the single-sided reserved gap h of the tab 232, the width H of the first clearance portion 252 can be designed as H = D + 2d + 2h. In this way, not only is the requirement of the first clearance portion 252 to accommodate the tab 232 for folding satisfied, reducing damage to the tab 232 due to insufficient size reservation, but also, the excess space on both sides of the tab 232 can be reserved for the design of the support portion 251, increasing the area of ​​the support portion 251 and improving the reliability of the support.

[0133] According to some embodiments of this application, the top support 25 further includes a transition portion 255, on the side facing the main body portion 231, the first clearance portion 252 is at least partially connected to the support portion 251 through the transition portion 255.

[0134] The transition section 255 is a component that enables a smoother connection between two parts.

[0135] Since the first clearance portion 252 is spaced apart from the main body portion 231, and the support portion 251 abuts against the main body portion 231, there is a height difference between them. By providing the first clearance portion 252 to be at least partially connected to the support portion 251 through the transition portion 255, the height difference at the connection point can be mitigated, reducing the generation of sharp points. This reduces damage to the electrode tab 232 when it comes into contact with it. In addition, providing the transition portion 255 also enhances the connection strength at the connection point between the first clearance portion 252 and the support portion 251, improving the support reliability of the support portion 251 and the reliability of the first clearance portion 252 in providing clearance to the electrode tab 232.

[0136] In some embodiments, the transition portion 255 is inclined relative to both the support portion 251 and the first clearance portion 252.

[0137] In this way, the support part 251 and the first clearance part 252 can be connected by a ramp, which improves the reliability of the connection.

[0138] In other embodiments, the transition portion 255 may also be an arc transition portion or other types of transition portions.

[0139] In some embodiments, the transition portion 255 may be connected between the aforementioned second support portion 2512 and the first clearance portion 252, or between the third support portion 2513 and the first clearance portion 252. Of course, the transition portion 255 may also be disposed between other support portions 251 and the first clearance portion 252, as detailed in the following embodiments.

[0140] According to some embodiments of this application, along the width direction of the top support 25, the first clearance portion 252 has a first edge side, the first edge side being the edge of the top support 25, and the support portion 251 includes a first support portion 2511, the first support portion 2511 being disposed on the side of the first clearance portion 252 away from the first edge side, and at least a portion of the first clearance portion 252 being connected to the first support portion 2511 through a transition portion 255.

[0141] Since the first clearance portion 252 needs to be relatively long along the length of the top support 25, the first support portion 2511 is also relatively long. Therefore, when at least a part of the first clearance portion 252 is connected to the first support portion 2511 through the transition portion 255, the connection strength at the connection between the first clearance portion 252 and the first support portion 2511 can be enhanced, thereby improving the support reliability of the first support portion 2511 and the reliability of the first clearance portion 252 in clearing the tab 232.

[0142] Furthermore, compared to the transition portion 255 connecting the other sides of the first clearance portion 252 to the support portion 251, the connection between the first clearance portion 252 and the first support portion 2511 provides a higher reliability and enhanced connection strength. Additionally, no transition portions 255 are provided on either side of the first clearance portion 252 along the length of the top bracket 25. This is because the space on these sides is already small, and the transition portion 255 would occupy space along the length of the first clearance portion 252, potentially causing it to come into contact with weak points on the side of the tab 232 in the width direction, thus damaging the tab 232. The transition portion 255 also occupies space on the support portion 251, reducing its area and lowering the reliability of the support.

[0143] Furthermore, along the length of the top support 25, the transition portion 255 extends continuously from one side edge of the first clearance portion 252 to the opposite side edge.

[0144] The continuous extension of the transition portion 255 ensures that all connection points between the first clearance portion 252 and the first support portion 2511 are provided with transition structures. Therefore, the connection strength at the connection between the first clearance portion 252 and the first support portion 2511 is further enhanced, improving the support reliability of the first support portion 2511 and the reliability of the first clearance portion 252 in clearing the tab 232.

[0145] In some embodiments, the top support 25 further includes a liquid injection circulation section 256, which is disposed facing the main body 231 and connected to the first clearance section 252, and the transition section 255 is located in the liquid injection circulation section 256.

[0146] The liquid injection circulation section 256 is a channel for liquid to flow when liquid is injected into the housing 22. Specifically, the liquid injection circulation section 256 can be a circulation groove provided in the main body 231. More specifically, the bottom of the circulation groove is part of the first clearance section 252, so that the liquid injection circulation section 256 communicates with the first clearance section 252. In other embodiments, the liquid injection circulation section 256 can also be some circulation holes, etc.

[0147] Specifically, the end cap assembly 24 is provided with a liquid injection hole 243, and the top bracket 25 is provided with a liquid injection blocking part 257 on the side facing the end cap assembly 243. The liquid injection blocking part 257 is correspondingly arranged with respect to the liquid injection hole 243. The top bracket 25 also includes a connecting hole 258, which connects the liquid injection blocking part 257 and the liquid injection flow part 256. Thus, when liquid is injected into the housing 22, the liquid flows through the liquid injection hole 243 to the liquid injection blocking part 257, which blocks the liquid, allowing it to flow into the interior of the housing 22 only after passing through the liquid injection blocking part 257. This reduces the impact force of the liquid, making it less likely for the liquid to impact the electrode assembly 23 and less likely to cause the separator to fold inward and cause a short circuit. After passing through the liquid blocking part 256, the liquid flows through the connecting hole 258 to the liquid injection flow part 256, and then enters the electrode assembly 23.

[0148] The transition section 255 is located away from the electrolyte flow section 256, meaning that the positions of the transition section 255 and the electrolyte flow section 256 are independent of each other. In this way, the transition section 255 does not obstruct the flow of electrolyte on the side facing the main body 231.

[0149] It should be noted that, since the transition portion 255 is located in the liquid flow portion 256, the transition portion 255 cannot extend continuously from one side edge of the first clearance portion 252 to the opposite side edge along the length direction of the top support 25.

[0150] Specifically, in the embodiments of this application, along the length of the top support 25, the transition portion 255 extends continuously from one side edge of the first clearance portion 252 to the liquid injection flow portion 256. In this way, the transition portion 255 can connect as many times as possible between the first clearance portion 252 and the first support portion 2511, thereby enhancing the connection strength at the connection between the first clearance portion 252 and the first support portion 2511.

[0151] In the embodiments of this application, when the first clearance portion 252 includes two sets, since the liquid injection flow portion 256 is usually only close to one set of the first clearance portions 252 along the length direction of the top support 25, each of the first clearance portions 252 of one set of the first clearance portions 252 extends continuously from one side edge of the first clearance portion 252 to the opposite side along the length direction of the top support 25, while each of the first clearance portions 252 of the other set of the first clearance portions 252 extends continuously from one side edge of the first clearance portion 252 to the liquid injection flow portion 256.

[0152] According to some embodiments of this application, support portions 251 are provided on both sides of the second clearance portion 252 along the length direction of the top support 25.

[0153] Since the second clearance portion 252 is spaced apart from the main body portion 231, it cannot bear the weight of the main body portion 231. Therefore, when a support portion 251 is provided on the side of the second clearance portion 252, the side of the second clearance portion 252 can abut against the main body portion 231 to provide reliable support and thus bear the weight. Therefore, the support portion 251 can be as close as possible to the second clearance portion 252, which cannot bear the weight of the main body portion 231. This not only allows the support portion 251 to better share the weight, but also improves the reliability of the second clearance portion 252 in avoiding interference from the top support 25 for pressure relief. In addition, the pressure relief mechanism 241 is usually located in the middle of the end cap assembly 24, and the position of the second clearance part 252 corresponds to the pressure relief mechanism 241. Therefore, the second clearance part 252 is also usually located in the middle of the top support 25. Thus, there is enough space on both sides of the second clearance part 252 to install the support part 251. Since the support part 251 is located on both sides of the second clearance part 252, the weight distribution on both sides can be better balanced, thereby improving the support reliability of the top support 25.

[0154] Specifically, along the length of the top support 25, the first support 2511, the second support 2512, and the third support 2513 are provided on opposite sides of the second clearance portion 252. The first support 2511 and the second support 2512 are adjacent to the second clearance portion 252, and the third support 2513 is spaced apart from the second clearance portion 252.

[0155] According to some embodiments of this application, along the thickness direction of the top bracket 25, the surface of the support portion 251 facing the main body portion 231 is positioned closer to the main body portion 231 than the surface of the second clearance portion 253 facing the main body portion 231.

[0156] Along the thickness direction of the top bracket 25, the surface of the support portion 251 facing the main body 231 is positioned closer to the main body 231 than the surface of the second clearance portion 253 facing the main body 231. This means that the surface of the support portion 251 facing the main body 231 is closer to the main body 231 than the surface of the second clearance portion 253 facing the main body 231. When the battery cell 20 is inverted, the support portion 251 can abut against the main body 231, while the second clearance portions 253 are spaced apart from the main body 231, meaning they do not abut against it.

[0157] It should be noted that, since the distances between the support portion 251 and the second clearance portion 253 facing the main body portion 231 are different, a height difference will be formed on the side of the top bracket 25 facing the main body portion 231. These height differences will cause the support portion 251 to be a protrusion and the second clearance portion 253 to be a groove.

[0158] In the embodiments of this application, since the second venting portion 253 is spaced apart from the main body portion 231, the gas in the battery cell 20 can flow through the reserved gap to the pressure relief mechanism 241 of the end cover assembly 24 via the second venting portion 253.

[0159] In this way, the gas inside the battery cell 20 can be vented to the second vent 253 through the gap between the main body 231 and the second vent 253, and then vented to the outside through the pressure relief mechanism 241 on the end cap assembly 24, thereby improving the pressure relief reliability.

[0160] According to some embodiments of this application, the support portion 251 forms a first recess 259 on the side facing the end cap assembly 24, and the first recess 259 is provided with a reinforcing rib 260.

[0161] The support portion 251 forms a first recess 259 on the side facing the end cap assembly 24, which can save material of the top bracket 25. Furthermore, by providing reinforcing ribs 260 in the first recess 259, the structural strength of the support portion 251 can be improved, thus achieving reliable support.

[0162] Furthermore, the reinforcing rib 260 includes a first rib 261 and a second rib 262, which are intersectingly disposed within the recess.

[0163] This results in the support portion 251 being structurally reinforced in both intersecting directions, thus comprehensively improving the structural strength of the support portion 251.

[0164] Optionally, the first rib 261 extends along the length of the top support 25, and the second rib 262 extends along the width of the top support 25.

[0165] Optionally, the first reinforcing bar 261 includes at least two bars, and the second reinforcing bar 262 includes at least two bars.

[0166] Furthermore, the transition portion 255 forms a second recess on the side facing the end cap assembly 24, the second recess communicating with the first recess 259, and the reinforcing rib 260 extending into the second recess.

[0167] The transition portion 255 is a transition structure connecting the first clearance portion 252 and the support portion 251. Therefore, it still appears as a protrusion on the side facing the main body portion 231. Thus, a second recessed portion can be formed on the side facing the end cap assembly 24. This also achieves the effect of saving materials and improving the structural strength of the transition portion 255.

[0168] According to some embodiments of this application, refer to Figures 4-6 A battery cell 20 is provided, including a housing 22, an electrode assembly 23, an end cap assembly 24, and a top support 25. The housing 22 has an opening, and the electrode assembly 23 is housed within the housing 22, including a main body 231 and tabs 232 located on one side of the main body 231. The end cap assembly 24 is disposed on the side of the electrode assembly 23 with tabs 232 and covers the opening, and the end cap assembly 24 has a pressure relief mechanism 241. The tabs 232 include a positive tab 2321 and a negative tab 2322, which are located at opposite ends of the main body 231. The top support 25 is located between the main body 231 and the end cap assembly 24, and includes a support portion 251, four first clearance portions 252, two clearance portions 253, two connecting portions 254, and four transition portions 255. Four first clearance portions 252 are respectively provided for two positive electrode tabs 2321 and two negative electrode tabs 2322, and a second clearance portion 253 is provided for a pressure relief mechanism 241. Along the thickness direction of the top bracket 25, the surface of the support portion 251 facing the main body portion 231 is positioned closer to the main body portion 231 than the surfaces of the first clearance portions 252 and the second clearance portions 253 facing the main body portion 231.

[0169] The support portion 251 includes two first support portions 2511, four second support portions 2512, and four third support portions 2513. Along the width direction of the top bracket 25, a second clearance portion 252 extends from one edge of the top bracket 25 to the opposite edge. One first support portion 2511, two second support portions 2512, and two third support portions 2513 are distributed on one side of the second clearance portion 252, while another first support portion 2511, two second support portions 2512, and two third support portions 2513 are distributed on the other side of the second clearance portion 252. Two positive electrode tabs 2321 are distributed opposite each other on one side of the second clearance portion 252 along the width direction of the top bracket 25, and two negative electrode tabs 2322 are distributed opposite each other on the other side of the second clearance portion 252 along the width direction of the top bracket 25. Along the length of the top support 25, two connecting parts 254 are located on the two sides of the top support 25 along its length and are spaced apart from the second clearance part 252.

[0170] One first support portion 2511 connects one connecting portion 254 to the second clearance portion 252, and another first support portion 2511 connects another connecting portion 254 to the second clearance portion 252. Every two second support portions 2512 are distributed opposite each other on both sides of the corresponding first support portion 2511 along the width direction of the top bracket 25, and each second support portion 2512 is located between the corresponding first clearance portion 252 and the second clearance portion 252. Every two third support portions 2513 are distributed opposite each other on both sides of the corresponding first support portion 2511 along the width direction of the top bracket 25, and each third support portion 2513 is located between the corresponding first clearance portion 252 and the connecting portion 254. Each first clearance portion 252 is connected to the first support portion 2511 via a transition portion 255.

[0171] According to some embodiments of this application, refer to Figures 1-6 A battery device 100 is provided, including the battery cell 20 in any of the above embodiments.

[0172] The battery device 100 of this application embodiment, by providing a top bracket 25 including a first clearance portion 252, can prevent the top bracket 25 from abutting against the tab 232 when the battery cell 20 is inverted, thereby reducing the gravitational force of the main body 231 on the tab 232. Furthermore, since the first clearance portion 252 is spaced from the main body 231 and cannot bear the weight of the main body 231, when at least one side of the first clearance portion 252 is provided with a support portion 251, at least one side of the first clearance portion 252 can abut against the main body 231 for reliable support, thereby bearing the weight. Therefore, the support portion 251 can be positioned as close as possible to the first clearance portion 252, which cannot bear the weight of the main body 231, improving the reliability of the first clearance portion 252 in avoiding the tab 232. Furthermore, without affecting the tab 232 and the exhaust, the side space of the first clearance portion 253 is fully utilized, increasing the contact area between the main body portion 231 of the electrode assembly 23 and the top support 25. This allows the top support 25 to better share the weight and reduce the pressure on the end face of the main body portion 231. Consequently, it reduces the likelihood of the electrode plates of the electrode assembly 23 being damaged during vibration or the tab 232 being inserted into the main body portion 231 and coming into contact with the electrode plates, causing a short circuit. This improves the reliability of the battery cell 20.

[0173] The battery device 100 also includes a housing 10, which has a top surface and a bottom surface that are arranged opposite each other along the direction of gravity. The battery cell 20 is disposed inside the housing 10, and the end cap assembly 24 is arranged facing the bottom surface.

[0174] In this way, the battery cell 20 can be placed upside down inside the housing 10, and the top support 25 can reliably abut against the main body 231 of the electrode assembly 23. Furthermore, due to the first clearance portion 252, the top support 25 does not abut against the tab 232, thus reducing the gravitational force exerted by the main body 231 on the tab 232. Moreover, by fully utilizing the lateral space of the first clearance portion 252 to set up the support portion 251, the contact area between the main body 231 of the electrode assembly 23 and the top support 25 is increased. This allows the top support 25 to better distribute the weight, reducing the pressure on the end face of the main body 231. This reduces the likelihood of the electrode plates of the electrode assembly 23 being damaged during vibration or the tab 232 inserting into the main body 231 and contacting the electrode plates, causing a short circuit, thereby improving the reliability of the battery cell 20.

[0175] In addition, this application also provides an electrical device, including the battery device 100 in any of the above embodiments.

[0176] The electrical device of this application embodiment, by providing a top bracket 25 including a first clearance portion 252, can prevent the top bracket 25 from abutting against the tab 232 when the battery cell 20 is inverted, thereby reducing the gravitational force of the main body 231 on the tab 232. Furthermore, since the first clearance portion 252 is spaced from the main body 231 and cannot bear the weight of the main body 231, when at least one side of the first clearance portion 252 is provided with a support portion 251, at least one side of the first clearance portion 252 can abut against the main body 231 for reliable support, thus bearing the weight. Therefore, the support portion 251 can be positioned as close as possible to the first clearance portion 252, which cannot bear the weight of the main body 231, improving the reliability of the first clearance portion 252 in avoiding the tab 232. Furthermore, without affecting the tab 232 and the exhaust, the side space of the first clearance portion 253 is fully utilized, increasing the contact area between the main body portion 231 of the electrode assembly 23 and the top support 25. This allows the top support 25 to better share the weight and reduce the pressure on the end face of the main body portion 231. Consequently, it reduces the likelihood of the electrode plates of the electrode assembly 23 being damaged during vibration or the tab 232 being inserted into the main body portion 231 and coming into contact with the electrode plates, causing a short circuit. This improves the reliability of the battery cell 20.

[0177] 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. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The shell has an opening; An electrode assembly is housed within the housing and includes a main body and an electrode tab located on one side of the main body; An end cap assembly is disposed on the side of the electrode assembly having the tab and covers the opening; the end cap assembly has a pressure relief mechanism; and A top bracket is located between the main body and the end cap assembly. The top bracket includes a support portion, a first clearance portion, and a second clearance portion. The first clearance portion is disposed corresponding to the electrode tab, and the second clearance portion is disposed corresponding to the pressure relief mechanism. Along the width direction of the top bracket, the second clearance portion extends from one edge of the top bracket to the opposite edge. Along the thickness direction of the top bracket, the surface of the support portion facing the main body is disposed closer to the main body than the surface of the first clearance portion facing the main body. The support portion is provided on at least one side of the first clearance portion along the length direction of the top support.

2. The battery cell according to claim 1, characterized in that, Along the length of the top support, the first clearance portion is located on one side of the second clearance portion; The support portion is provided between the first clearance portion and the second clearance portion; and / or The support portion is provided on the side of the first clearance portion away from the second clearance portion.

3. The battery cell according to claim 1, characterized in that, Along the thickness direction of the top support, the support portion located on one side of the first clearance portion is spaced apart from the first clearance portion to form a gap.

4. The battery cell according to claim 1, characterized in that, Along the length of the top support, the top support also includes a connecting portion located on the side, the end cap assembly also includes an insulating member, the connecting portion is connected to the insulating member, and a portion of the support portion extends continuously from the second clearance portion to the connecting portion.

5. The battery cell according to claim 1, characterized in that, Along the length of the top support, the root width of the electrode lug is D, the preset single-sided misalignment width of the electrode lug is d, the single-sided reserved gap of the electrode lug is h, and the width of the first clearance portion is H. Where H = D + 2d + 2h, 6 mm ≤ d ≤ 15 mm, 1 mm ≤ h ≤ 3 mm.

6. The battery cell according to claim 1, characterized in that, The top support also includes a transition section, on the side facing the main body, at least a portion of the first clearance section is connected to the support section through the transition section.

7. The battery cell according to claim 6, characterized in that, The transition section is inclined relative to both the support section and the first clearance section.

8. The battery cell according to claim 6 or 7, characterized in that, Along the width direction of the top support, the first clearance portion has a first edge side, which is the edge of the top support. The support portion includes a first support portion, which is disposed on the side of the first clearance portion away from the first edge side. At least a portion of the first clearance portion is connected to the first support portion through the transition portion.

9. The battery cell according to claim 8, characterized in that, Along the length of the top support, the transition portion extends continuously from one edge of the first clearance portion to the opposite edge; and / or The top support also includes a liquid injection circulation section, which is disposed facing the main body and connected to the first clearance section; the transition section is located in the liquid injection circulation section.

10. The battery cell according to claim 1, characterized in that, The first clearance portion includes two parts, which are arranged opposite each other along the width direction of the top support, and the support portion is provided between the two first clearance portions.

11. The battery cell according to claim 1, characterized in that, Along the length of the top support, the support portion is provided on both sides of the second clearance portion.

12. The battery cell according to claim 1, characterized in that, Along the thickness direction of the top bracket, the surface of the support portion facing the main body is positioned closer to the main body than the surface of the second clearance portion facing the main body.

13. The battery cell according to claim 1, characterized in that, The support portion forms a first recess on the side facing the end cap assembly, and the first recess is provided with reinforcing ribs.

14. The battery cell according to claim 13, characterized in that, The reinforcing rib includes a first rib and a second rib, which are intersectingly disposed within the recess.

15. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 14.

16. The battery device according to claim 15, characterized in that, The battery device further includes a housing having a top surface and a bottom surface that are arranged opposite each other along the direction of gravity, the battery cells being disposed inside the housing, and the end cap assembly being disposed facing the bottom surface.

17. An electrical device, characterized in that, Includes the battery device as described in claim 15 or 16.

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