Battery cell, battery device and electric device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. A battery cell including: a housing; a pole mounted on the housing; the electrode assembly is arranged in the shell, the distance between the folded position of a tab of the electrode assembly and the first side of the shell in the thickness direction is larger than the distance between the folded position of the tab and the second side of the shell, and the folded part of the tab is folded towards the first side; the support is arranged between the shell and the electrode assembly and forms an opening used for leading out the tab, the distance between the opening and the first side is larger than the distance between the opening and the second side, and the folded part of the tab extends out of the opening to be electrically connected with the pole. Through the common offset design of the folding position of the tab and the opening of the bracket, a larger folding space is provided for the tab, the risk of tab breakage is reduced, the bending times of the folding part can be reduced, the risk that the tab is broken from a stress concentration part after long-term use is reduced, and the performance and the reliability of the battery monomer are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] In a conventional battery monomer design, a bracket structure is usually used to fold the tab, and an S-shaped folding method is used to reduce the space occupied by the tab and enhance the stability of the structure. However, for an electrode assembly with a small thickness, due to space limitations, the folding space of the tab becomes very limited, which often leads to excessive mechanical stress on the tab during the folding process, thereby increasing the risk of tab breakage. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a battery monomer, a battery device and a power utilization device to provide a larger folding space for the tab and reduce the risk of tab breakage.

[0004] In a first aspect, the embodiments of the present application provide a battery monomer, comprising:

[0005] a shell;

[0006] a pole installed in the shell;

[0007] an electrode assembly arranged in the shell, a folding position of a tab of the electrode assembly being closer to a first side of the shell along a thickness direction than to a second side, and a folding portion of the tab being arranged to be folded towards the first side;

[0008] a bracket arranged between the shell and the electrode assembly and forming an opening for leading out the tab, the opening being closer to the first side than to the second side, and the folding portion of the tab extending from the opening to be electrically connected to the pole.

[0009] In the above technical solution, by jointly offsetting the folding position of the tab and the opening of the bracket, a larger folding space is provided for the tab, effectively relieving the mechanical stress on the tab during the folding process, thereby reducing the risk of tab breakage, and significantly improving the yield of the production line. In addition, the number of bending times of the folding portion is reduced, the phenomenon of stress concentration is alleviated, and the risk of tab breakage from the stress concentration point under long-term use is reduced, thereby improving the performance and reliability of the battery monomer, prolonging the service life of the battery monomer, and further improving the stability and reliability of the battery device.

[0010] In some embodiments, the folding portion of the electrode includes a first segment and a second segment, the first segment extending through the opening, the second segment located within the bracket and electrically connected to the electrode post, and the distance from the edge of the opening near the first side to the first side being greater than the distance from the end of the second segment away from the first segment to the first side.

[0011] In some embodiments, the support is inclined away from the surface of the pole post to abut against the unconvinced portion of the tab.

[0012] In some embodiments, the electrode tabs include a first electrode tab and a second electrode tab located at the same end of the electrode assembly and having opposite polarities, and the support includes:

[0013] An isolator is disposed between the two openings corresponding to the first electrode tab and the second electrode tab, for separating the first electrode tab and the second electrode tab.

[0014] In some embodiments, the end face of the housing has a liquid injection hole, the housing is provided with a baffle adapted to be disposed opposite to the liquid injection hole, and the isolation member is provided with a notch for avoiding the baffle.

[0015] In some embodiments, the support has a plurality of through-holes for filling.

[0016] In some embodiments, the battery cell further includes:

[0017] An explosion-proof valve is disposed in the housing and located at the end of the electrode assembly opposite to the bracket;

[0018] Side support plates are attached to both sides of the electrode assembly along the width direction of the housing; wherein the bracket is provided with an exhaust port, the exhaust port being adapted to communicate with the gap between the side support plates and the housing.

[0019] In some embodiments, the battery cell further includes:

[0020] An adapter is disposed within the bracket, clamping at least a portion of the folded portion of the electrode tab, the electrode post portion extending into the bracket, and the adapter being connected to the electrode post.

[0021] In some embodiments, the housing includes:

[0022] case;

[0023] An end cap, connected to the housing, is used to seal the opening of the housing. The pole is installed on the end cap, and the end cap is provided with a first snap-fit ​​structure. The bracket is provided with a second snap-fit ​​structure for snap-fitting with the first snap-fit ​​structure.

[0024] Secondly, embodiments of this application provide a battery device, including: a plurality of battery cells as described above.

[0025] Thirdly, embodiments of this application provide an electrical device, including: a battery cell as described above or a battery device as described above, wherein the battery cell or the battery device is used to store or provide electrical energy. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0028] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0029] Figure 3 Exploded views of the structure of a single battery cell provided in some embodiments of this application;

[0030] Figure 4 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0031] Figure 5 A schematic diagram of the assembly of the bracket and cover plate provided in some embodiments of this application;

[0032] Figure 6 This is one of the structural schematic diagrams of the bracket provided in some embodiments of this application;

[0033] Figure 7 This is a second schematic diagram of the structure of the bracket provided in some embodiments of this application.

[0034] Figure label:

[0035] 1000 vehicles;

[0036] Battery device 100;

[0037] Box 10, first box body 11, second box body 12;

[0038] 20 battery cells;

[0039] Outer shell 21, housing 211, first side 2111, second side 2112, end cap 212, injection hole 2121, baffle 2122, first snap-fit ​​structure 2123;

[0040] Column 22;

[0041] Electrode assembly 23, tab 231, first tab 231a, second tab 231b, unconvinced portion 2311, convinced portion 2312, first segment 23121, second segment 23122;

[0042] 24 bracket, 241 opening, 242 isolator, 2421 notch, 243 filling port, 244 second snap-fit ​​structure, 245 vent.

[0043] Side support plate 25, adapter 26;

[0044] Controller 200; Motor 300. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0047] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0050] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0051] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0052] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0053] Battery cells can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to any of these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to any of these types either.

[0054] A battery cell includes a casing, electrode components, and electrolyte. The casing houses the electrode components and electrolyte. The electrode components consist of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode components. The positive electrode includes a positive current collector and a positive active material layer. The positive current collector includes a current collector body and a positive electrode tab. The positive active material layer is coated on the surface of the current collector body, while the positive electrode tab is not coated with the positive active material layer and protrudes from the current collector body. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative current collector includes a current collector body and a negative electrode tab. The negative active material layer is coated on the surface of the current collector body, while the negative electrode tab is not coated with the negative active material layer and protrudes from the current collector body. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0055] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0056] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, including aircraft, rockets, space shuttles, and spacecraft. Individual battery cells are used to store or provide electrical energy.

[0057] The inventors discovered that in order to better retract the electrode tabs, a support structure is usually used to achieve the retraction of the electrode tabs. The common way to retract the electrode tabs is in an S-shape. However, for electrode components with a small thickness, this design will result in insufficient space for the electrode tabs to retract, which will easily lead to the problem of electrode tab breakage.

[0058] Based on the above considerations, in order to solve the problem of insufficient space for the tabs to fold, the inventors, after in-depth research, designed a battery cell including: a shell, a terminal post, an electrode assembly, and a bracket. The terminal post is installed in the shell; the electrode assembly is located inside the shell, and the distance from the folded position of the electrode tab to the first side of the shell along the thickness direction is greater than the distance to the second side, and the folded part of the electrode tab is folded towards the first side; the bracket is located between the shell and the electrode assembly, and the bracket forms an opening for leading out the electrode tab, the distance from the opening to the first side is greater than the distance to the second side, and the folded part of the electrode tab extends out from the opening to be electrically connected to the terminal post.

[0059] In this type of battery cell, by adopting an eccentric design for the folding position of the tabs and correspondingly eccentrically setting the opening position of the bracket, more folding space can be provided for the tabs, effectively solving the problem of tabs breaking due to insufficient space during the folding process. This improves the performance and reliability of the battery cell, extends the service life of the battery cell, and further enhances the stability and reliability of the battery device.

[0060] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0061] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0062] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0063] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0064] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0065] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0066] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0067] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0068] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0069] This application provides an electrical device that uses a single battery cell or battery pack 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, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0070] 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.

[0071] Please refer to Figure 1 , Figure 1 This 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. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 100 is installed inside the vehicle, and the battery device 100 can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The vehicle 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 during starting, navigation, and driving.

[0072] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0073] Please refer to Figure 2 , Figure 2This is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a plurality of battery cells 20, which are housed within the housing 10. The housing 10 provides assembly space for the battery cells 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cells 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12. Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as cylinder, cuboid, etc.

[0074] In the battery device 100, multiple battery cells 20 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 configurations. 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 then 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.

[0075] Please refer to Figure 2 The battery device 100 includes multiple rows of battery cells 20, which are arranged along a first direction. Each row of battery cells 20 includes multiple battery cells 20 arranged along a second direction. The first direction and the second direction are the length direction and the width direction of the housing 10, respectively, and the first direction and the second direction are perpendicular to each other.

[0076] The technical solutions described in this application can also be applied to various energy storage devices that use individual battery cells or battery devices. These energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours.

[0077] Unless otherwise specified, refer toFigure 3 and further refer to Figure 4 In this embodiment of the application, the length direction of the outer shell 21 is the X direction in the figure, the width direction of the outer shell 21 is the Y direction in the figure, and the thickness direction of the outer shell 21 is the Z direction in the figure.

[0078] According to some embodiments of this application, refer to Figure 3 and further refer to Figure 4 This application provides a battery cell 20, including: a housing 21, a terminal post 22, an electrode assembly 23, and a support 24. The terminal post 22 is mounted on the housing 21; the electrode assembly 23 is disposed inside the housing 21, and the distance from the folded position of the tab 231 of the electrode assembly 23 to the first side 2111h1 of the housing 21 along the thickness direction is greater than the distance h2 to the second side 2112, and the folded portion 2312 of the tab 231 is folded towards the first side 2111; the support 24 is disposed between the housing 21 and the electrode assembly 23, and the support 24 forms an opening 241 for leading out the tab 231, the distance h3 from the opening 241 to the first side 2111 is greater than the distance h4 to the second side 2112, and the folded portion 2312 of the tab 231 extends out from the opening 241 to be electrically connected to the terminal post 22.

[0079] The tabs 231 of the electrode assembly 23 can be led out on the same side or on opposite sides, and this application embodiment does not limit this.

[0080] For example, in some embodiments, reference Figure 3 The tabs 231 of the electrode assembly 23 are all led out from the top. In this case, a bracket 24 is provided above the electrode assembly 23.

[0081] For example, in some other embodiments, the tabs 231 of the electrode assembly 23 are led out at the top and bottom, in which case the support 24 is provided above and below the electrode assembly 23.

[0082] For example, in some other embodiments, the tabs 231 of the electrode assembly 23 are led out at the bottom, in which case a support 24 is provided below the electrode assembly 23.

[0083] It should be noted that, referring to Figure 4 Each tab 231 includes a retracted portion 2312 and an unretracted portion 2311. The retracted position of the tab 231 of the electrode assembly 23 is the connection interface between the retracted portion 2312 and the unretracted portion 2311.

[0084] In related technologies, in some battery cells, the tabs of the electrode assembly extend from the middle position, and the tabs begin to fold from the middle position, folding to one side and undergoing at least one bend. However, in practical applications, the folding width left for the tabs is generally only half the thickness of the electrode assembly. Especially when this folding method is applied to electrode assemblies with a small thickness, the limited folding space cannot meet the folding requirements of the tabs. During processing, in order to complete the folding operation in a confined space, the tabs may need to undergo too many bends or other complex operations, which can easily cause the stress on the tabs during the folding process to exceed their limit and break, thereby increasing the scrap rate of the production line. In addition, frequent bending of the tabs in a limited space can easily create stress concentration points, and under long-term use, the tabs are also very likely to break from these stress concentration points.

[0085] Understandably, referring to Figure 3 and further refer to Figure 4 The distance from the folded position of the tab 231 of the electrode assembly 23 to the first side 2111h1 of the outer shell 21 along the thickness direction is greater than the distance h2 to the second side 2112. In other words, the folded position of the tab 231 of the electrode assembly 23 is spaced apart from the middle, that is, the folded position of the tab 231 of the electrode assembly 23 is eccentrically set. Also, the distance h3 from the opening 241 to the first side 2111 is greater than the distance h4 to the second side 2112, that is, the opening 241 of the bracket 24 is also eccentrically set to match the folded position of the tab 231. Thus, compared to the conventional solution with a central tab 231, the battery cell 20 of this application provides a larger bending space for the tab 231. The folded portion 2312 of the tab 231 can directly pass through the opening 241 and be bent and folded on the more spacious first side 2111. The mechanical stress on the tab 231 during the folding process is effectively relieved, thereby reducing the risk of tab 231 breakage and significantly improving the yield of the production line. In addition, it can reduce the number of bends of the folded portion 2312 in some cases, and the stress can be distributed more evenly, alleviating the stress concentration phenomenon and reducing the risk of tab 231 breaking from the stress concentration point under long-term use. This improves the performance and reliability of the battery cell 20, extends the service life of the battery cell 20, and thus improves the stability and reliability of the battery device 100.

[0086] The battery cell 20 provided in this application embodiment, through the common offset design of the above-mentioned folding position of the tab 231 and the opening 241 of the bracket 24, provides a larger folding space for the tab 231, effectively alleviating the mechanical stress on the tab 231 during the folding process, thereby reducing the risk of tab 231 breakage, and significantly improving the yield rate of the production line. It can also reduce the number of bending times of the folding part 2312, alleviate the stress concentration phenomenon, and reduce the risk of tab 231 breaking from the stress concentration point under long-term use, thereby improving the performance and reliability of the battery cell 20, extending the service life of the battery cell 20, and thus improving the stability and reliability of the battery device 100.

[0087] According to some embodiments of this application, refer to Figure 4 The retractable portion 2312 of the electrode 231 includes a first segment 23121 and a second segment 23122. The first segment 23121 passes through the opening 241, and the second segment 23122 is located inside the bracket 24 and is electrically connected to the electrode post 22. The distance from the edge of the opening 241 near the first side 2111 to the first side 2111 is greater than the distance from the end of the second segment 23122 away from the first segment 23121 to the first side 2111.

[0088] In this embodiment, refer to Figure 4 The first segment 23121 and the second segment 23122 are bent and connected in an L-shape. Specifically, the first segment 23121 can extend along the length direction of the shell 211, and the second segment 23122 can extend along the thickness direction of the shell 211. Since the distance from the edge of the opening 241 near the first side 2111 to the first side 2111 is greater than the distance from the end of the second segment 23122 away from the first segment 23121 to the first side 2111, in other words, the second segment 23122 extends beyond the opening 241 at least partially along the thickness direction of the shell 211. Thus, when the first segment 23121 collapses under external disturbance, the side of the bracket 24 away from the pole post 22 can provide good support for the first segment 23121, reducing the risk of the first segment 23121 collapsing and falling out of the bracket 24, causing the connection between the tab 231 and the pole post 22 to break.

[0089] It should be noted that the specific shape of the folded portion 2312 of the tab 231 is not limited to the shape described in the above embodiments. The folded shape of the tab 231 can be adjusted according to the actual situation. This application embodiment does not limit this.

[0090] The battery cell 20 provided in this application embodiment, through the design of the above-mentioned tab 231's folding portion 2312 consisting of a first segment 23121 and a second segment 23122, achieves the folding and smooth extension of the tab 231. Combined with the structural design that the distance from the edge of the opening 241 near the first side 2111 to the first side 2111 is greater than the distance from the end of the second segment 23122 away from the first segment 23121 to the first side 2111, the side of the bracket 24 away from the terminal post 22 can provide good support for the first segment 23121, thereby improving the reliability and stability of the electrical connection between the first segment 23121 and the terminal post 22, and thus improving the charging and discharging efficiency and cycle life of the battery device 100.

[0091] According to some embodiments of this application, refer to Figure 4 The support 24 is inclined away from the surface of the pole post 22 so as to abut the unfolded part 2311 of the pole tab 231.

[0092] In this embodiment, refer to Figure 4 The surface of the support 24 facing away from the pole post 22 can be divided into two or more inclined segments, each segment having a different tilt angle or curvature. This allows for fine adjustments based on different areas of the unconvinced portion 2311 of the pole tab 231, achieving a more precise fit.

[0093] In other embodiments, the surface of the support 24 facing away from the pole post 22 may exhibit a linear tilt angle, gradually transitioning from one end of the support 24 to the other.

[0094] In some other embodiments, the surface of the bracket 24 facing away from the pole post 22 can be designed as a curved shape, the curvature of which can be adjusted according to the shape of the unconvex portion 2311 of the tab 231 to achieve the best fit. This design can be used when the unconvex portion 2311 of the tab 231 has a complex or irregular shape.

[0095] The battery cell 20 provided in this application embodiment, through the matching design between the surface of the bracket 24 away from the terminal post 22 and the unfolded portion 2311 of the tab 231, makes the unfolded portion 2311 of the tab 231 fit more tightly on the bracket 24. This not only improves the stability of the tab 231, but also helps to reduce the movement and wear of the tab 231 under vibration or impact conditions. Furthermore, the bracket 24 can make more effective use of the internal space of the battery cell 20. While maintaining a good fit between the tab 231 and the bracket 24, it reduces unnecessary space waste and helps to improve the energy density of the battery cell 20.

[0096] According to some embodiments of this application, refer to Figure 3 and Figures 5-7As shown, the electrode tab 231 includes a first electrode tab 231a and a second electrode tab 231b located at the same end of the electrode assembly 23 and having opposite polarities, and the support 24 includes an isolation member 242.

[0097] The isolator 242 is disposed between the two openings 241 corresponding to the first tab 231a and the second tab 231b, and the isolator 242 is used to separate the first tab 231a and the second tab 231b.

[0098] Among them, reference Figure 3 and further refer to Figure 4 One of the first electrode tab 231a and the second electrode tab 231b is a positive electrode tab 231 and the other is a negative electrode tab 231. The first electrode tab 231a and the second electrode tab 231b are respectively led out through two openings 241 to be electrically connected to their respective corresponding pole posts 22.

[0099] The insulating element 242 can be made of a material with good insulation properties, such as plastic or ceramic, and this application does not limit it.

[0100] The main function of the isolator 242 is to reduce the short circuit between the first tab 231a and the second tab 231b, and to keep the first tab 231a and the second tab 231b electrically isolated during the retraction and connection process. The isolator 242 can be designed as a plate or other shapes, which are not limited in this application.

[0101] The separator 242 can be integrally formed with the bracket 24, or designed as a separate component and installed by snap-fit, adhesive or other means, depending on the overall design of the battery cell 20.

[0102] The battery cell 20 provided in this application embodiment, by adding an isolator 242 when the first tab 231a and the second tab 231b are on the same side, effectively separates the first tab 231a and the second tab 231b with opposite polarities, reduces the risk of short circuit caused by accidental contact between the first tab 231a and the second tab 231b, thereby improving the reliability of the battery cell 20, and further improving the reliability of the entire battery device 100.

[0103] According to some embodiments of this application, refer to Figure 3 and further refer to Figure 5 The end face of the outer casing 21 has an injection hole 2121. The outer casing 21 is provided with a baffle 2122 that is adapted to be arranged opposite to the injection hole 2121. The isolation member 242 is provided with a notch 2421 for avoiding the baffle 2122.

[0104] The electrolyte injection hole 2121 can be used to inject electrolyte during the assembly of the battery cell 20, and the baffle 2122 can be used to reduce the probability of electrolyte splashing and contaminating the outside of the battery cell 20 during the injection process, while protecting the internal structure of the battery cell 20.

[0105] In this embodiment, refer to Figure 3 and further refer to Figure 5 The injection hole 2121 is located in the middle of the end face of the outer shell 21, that is, the injection hole 2121 is located between the two pole posts 22. Therefore, the baffle 2122, which is suitable to be set opposite to the injection hole 2121, is also located between the two pole posts 22. At this time, the isolation member 242 and the baffle 2122 are also set opposite to each other along the length direction of the outer shell 21. Since the baffle 2122 protrudes towards the bracket 24, after the bracket 24 and the outer shell 21 are assembled, the bracket 24 needs to be provided with a notch 2421 to avoid the baffle 2122, so that the baffle 2122 can be installed normally and perform its function. The design of the notch 2421 also needs to match the shape and size of the baffle 2122 so that the two do not interfere with each other in space.

[0106] The battery cell 20 provided in this application embodiment, by setting the notch 2421 of the avoidance baffle 2122 in the above-mentioned isolation member 242, makes the internal components of the battery cell 20 more compact and reasonable, making full use of the limited space, thereby improving the integration of the battery cell 20. At the same time, by using the reasonable design of the baffle 2122 and the notch 2421, the isolation function of the isolation member 242 and the overall structural strength of the bracket 24 will not be affected, but the stability of the internal structure of the battery cell 20 is enhanced to a certain extent, maintaining the normal operation of the battery cell 20 under various working conditions.

[0107] According to some embodiments of this application, refer to Figure 6 and further refer to Figure 7 The support 24 is provided with multiple through-holes 243.

[0108] In this context, "multiple" means two or more. For example, in some embodiments, the support 24 is provided with 15 filling ports 243 that extend through the height of the housing 21.

[0109] In some implementations, refer to Figure 6 and further refer to Figure 7 Multiple electrolyte inlets 243 are evenly distributed on the support 24, so that the electrolyte can evenly wet all parts of the electrode assembly 23 and maintain the consistency of battery performance.

[0110] In other embodiments, multiple electrolyte inlets 243 are centrally located in areas of the electrode assembly 23 that require focused wetting, thereby accelerating the electrolyte wetting speed in these critical areas.

[0111] In some other embodiments, the inside or periphery of the filling port 243 may be provided with a flow guiding structure to promote the electrolyte to flow into the filling port 243 as soon as possible and reduce the residence time of the electrolyte on the support 24.

[0112] The shape of the filling port 243 can be designed as circular, square, triangular, trapezoidal or irregular, etc., and this application embodiment does not limit it.

[0113] The size of the filling port 243 can be optimized according to the properties of the electrolyte, the injection speed, and the size of the battery. Specifically, setting a larger diameter filling port 243 can significantly accelerate the electrolyte injection speed, which is suitable for production scenarios with extremely high requirements for filling efficiency, but may have a certain impact on the structural strength of the support 24, which needs to be strengthened during the design. On the other hand, a smaller diameter filling port 243 has less impact on the structural strength of the support 24, and the requirements for electrolyte injection volume and wetting speed can be met by increasing the number of filling ports 243, which is suitable for battery cells 20 with high requirements for the structural stability of the support 24.

[0114] The battery cell 20 provided in this embodiment increases the channels for electrolyte to enter the battery through the multiple filling ports 243, which can significantly improve the distribution efficiency of the electrolyte. This allows the electrolyte to quickly and uniformly wet the electrode assembly 23, thereby reducing the diffusion time of the electrolyte inside the electrode assembly 23 and improving the production efficiency of the battery device 100.

[0115] According to some embodiments of this application, refer to Figure 3 The battery cell 20 also includes an explosion-proof valve and a side support plate 25.

[0116] Reference Figure 3 and Figures 5-7 As shown, the explosion-proof valve is located on the housing 21 and at one end of the electrode assembly 23 away from the bracket 24; the side support plate 25 is attached to both sides of the electrode assembly 23 along the width direction of the housing 21; wherein, the bracket 24 is provided with an exhaust port 245, which is adapted to communicate with the gap between the side support plate 25 and the housing 21.

[0117] Reference Figure 3 Side support plates 25 are installed on both narrow sides of the electrode assembly 23 to support and protect the electrode assembly 23 as it is gradually inserted into the housing 21 along the length direction of the housing 21. The length direction of the side support plates 25 is parallel to the length direction of the housing 211, and both ends of the side support plates 25 extend out of the electrode assembly 23 to be fixedly connected to other components of the battery cell 20.

[0118] The shape of the exhaust port 245 can be designed as circular, square, or rectangular, etc., and this application embodiment does not limit this.

[0119] The exhaust port 245 can be designed as one or more, with "multiple" meaning two or more. The specific number can be optimized according to the size of the electrode assembly 23 and the gas emission requirements.

[0120] The exhaust port 245 can be located on the bracket 24 near the side support plate 25. Alternatively, the exhaust port 245 can be arranged in a targeted manner according to the main area where gas is generated inside the battery, so as to guide the gas to be discharged quickly. This application embodiment does not limit this.

[0121] For example, in some embodiments, reference Figures 5-7 As shown, the exhaust port 245 is located at both ends of the side support plate 25.

[0122] In actual implementation, refer to Figure 3 and Figures 5-7 As shown, the tabs 231 of the electrode assembly 23 are all led out from the top through the bracket 24. The explosion-proof valve is located below the electrode assembly 23, that is, at the bottom of the housing 21. When the internal pressure exceeds the safety threshold, due to the setting of the side support plate 25, the gas cannot be directly discharged from the side of the electrode assembly 23, but enters the bracket 24 through the opening 241, etc. Then, the gas can quickly enter the gap between the side support plate 25 and the housing 21 through the exhaust port 245, and finally flow to the bottom explosion-proof valve for safe discharge.

[0123] The battery cell 20 provided in this application embodiment, by setting an exhaust port 245 on the bracket 24 as described above, enables gas to enter the gap between the side support plate 25 and the outer shell 21 through the exhaust port 245 and then be discharged through the explosion-proof valve. This increases the gas discharge path of the battery cell 20, and the gas inside the battery can be discharged efficiently and quickly, accelerating the depressurization speed, reducing the internal pressure fluctuations caused by gas accumulation, and further improving the reliability of the battery cell 20 under various operating conditions.

[0124] According to some embodiments of this application, refer to Figure 4 The battery cell 20 also includes an adapter 26.

[0125] The adapter 26 is located inside the bracket 24. The adapter 26 clamps at least part of the folded portion 2312 of the electrode tab 231. The electrode post 22 extends into the bracket 24, and the adapter 26 is connected to the electrode post 22.

[0126] It is understandable that the adapter 26 is fixedly connected to the tab 231 in the form of a flexible connection to accommodate the slight displacement and shape changes between the tab 231 and the pole post 22.

[0127] The adapter 26 may be composed of conductive materials (such as copper foil, tin-plated copper braided wire, etc.) and insulating materials, etc., and this application embodiment does not limit this.

[0128] The connection method between the adapter 26 and the pole post 22 may include, but is not limited to, welding, riveting or nesting, and the embodiments of this application do not limit this.

[0129] In this embodiment, refer to Figure 4 The top of the bracket 24 abuts against the outer shell 21, a part of the pole post 22 extends into the bracket 24, the top of the adapter 26 can fit and connect with the pole post 22, and the bottom of the adapter 26 can form a slot that opens towards the second side 2112. A part of the second section 23122 of the folded portion 2312 of the tab 231 is inserted into the slot, thereby realizing the electrical connection between the tab 231 and the pole post 22 through the adapter 26.

[0130] The battery cell 20 provided in this application embodiment, through the above-mentioned adapter 26, can stably clamp the folded portion 2312 of the tab 231 and reliably connect it with the terminal post 22, reducing electrical connection problems caused by poor welding or mechanical loosening. In addition, by using a soft connection, it can adapt to the small displacement and shape changes between the tab 231 and the terminal post 22. Furthermore, combined with the structural design of the terminal post 22 extending into the bracket 24, the overall volume of the battery cell 20 is reduced, thereby improving the energy density of the battery device 100 while realizing the miniaturization design of the battery device 100.

[0131] According to some embodiments of this application, refer to Figure 3 and further refer to Figure 5 The outer casing 21 includes: a housing 211 and an end cap 212.

[0132] End cap 212 is connected to housing 211. End cap 212 is used to seal the opening of housing 211. Pole post 22 is installed on end cap 212. End cap 212 is provided with a first snap-fit ​​structure 2123. Bracket 24 is provided with a second snap-fit ​​structure 244 for snap-fitting with the first snap-fit ​​structure 2123.

[0133] In this embodiment, refer to Figure 3 The outer casing 21 may include a housing 211 and two end caps 212. The housing 211 may be designed as a frame structure with both ends open, and the two end caps 212 are respectively connected to the two open ends of the housing 211.

[0134] In other embodiments, the housing 211 may be designed as a cover-like structure with only one end open, and an end cap 212 is connected to the open end of the housing 211.

[0135] The end cap 212 and the bracket 24 are assembled through a snap-fit ​​between the first snap-fit ​​structure 2123 and the second snap-fit ​​structure 244. The first snap-fit ​​structure 2123 can be any structure that can form a snap-fit, such as a protrusion, a groove, or a buckle. Correspondingly, the second snap-fit ​​structure 244 can be a groove, a protrusion, or a buckle that matches the first snap-fit ​​structure 2123. This application embodiment does not limit this.

[0136] For example, in some embodiments, reference Figure 3 and further refer to Figure 5 The first snap-fit ​​structure 2123 is a snap-fit, and the second snap-fit ​​structure 244 is a snap-fit ​​groove.

[0137] In some embodiments, the first snap-fit ​​structure 2123 and the second snap-fit ​​structure 244 can be elastic snap-fit, meaning that one of them is elastic and can deform under force and then spring back to snap the other. In other embodiments, the first snap-fit ​​structure 2123 and the second snap-fit ​​structure 244 can also be rigid snap-fit, meaning that the two structures are perfectly matched in size and shape, and the snap-fit ​​is achieved by external force. This application does not limit this aspect.

[0138] The battery cell 20 provided in this embodiment achieves the assembly between the bracket 24 and the end cap 212 through the cooperation of the first snap-fit ​​structure 2123 and the second snap-fit ​​structure 244. On the one hand, the snap-fit ​​structure allows for rapid assembly and disassembly, reducing assembly time and improving production efficiency. On the other hand, compared with traditional threaded or welded connections, no additional tools are required, further simplifying the assembly process. Furthermore, it can effectively absorb vibration, reduce loosening of connections caused by mechanical impact, and improve the shock resistance of the battery device 100.

[0139] According to some embodiments of this application, this application also provides a battery device 100, which includes a plurality of battery cells 20 of any of the above embodiments.

[0140] According to some embodiments of this application, this application also provides an electrical device. The electrical device includes a battery cell 20 of any of the above embodiments, the battery cell 20 being used to store or provide electrical energy; or the electrical device includes a battery device 100 of any of the above embodiments, the battery device 100 being used to store or provide electrical energy.

[0141] The power supply device can be any of the aforementioned devices or systems that utilize battery device 100.

[0142] According to some embodiments of this application, see Figures 3-7As shown, this application provides a battery cell 20, including: a housing 21, a terminal post 22, an electrode assembly 23, and a support 24. The terminal post 22 is mounted on the housing 21; the electrode assembly 23 is disposed inside the housing 21, and the distance from the folded position of the tab 231 of the electrode assembly 23 to the first side 2111 of the housing 21 along the thickness direction is greater than the distance to the second side 2112, and the folded portion 2312 of the tab 231 is folded towards the first side 2111; the support 24 is disposed between the housing 21 and the electrode assembly 23, and the support 24 forms an opening 241 for leading out the tab 231, the distance from the opening 241 to the first side 2111 is greater than the distance to the second side 2112, and the folded portion 2312 of the tab 231 extends out from the opening 241 to be electrically connected to the terminal post 22. The retractable portion 2312 of the tab 231 includes a first segment 23121 and a second segment 23122. The first segment 23121 extends through the opening 241, and the second segment 23122 is located within the bracket 24 and is electrically connected to the pole post 22. The distance from the edge of the opening 241 near the first side 2111 to the first side 2111 is greater than the distance from the end of the second segment 23122 away from the first segment 23121 to the first side 2111. The surface of the bracket 24 facing away from the pole post 22 is inclined to abut against the unretractable portion 2311 of the tab 231. The tab 231 includes a first tab 231a and a second tab 231b located at the same end of the electrode assembly 23 and having opposite polarities. The support 24 includes a separator 242, which is disposed between two openings 241 corresponding to the first tab 231a and the second tab 231b, and is used to separate the first tab 231a and the second tab 231b. The end face of the housing 21 has a liquid injection hole 2121, and the housing 21 is provided with a baffle 2122 adapted to be disposed opposite to the liquid injection hole 2121. The separator 242 is provided with a notch 2421 for avoiding the baffle 2122. The support 24 is provided with a plurality of through-holes 243. The battery cell 20 also includes: an explosion-proof valve and a side support plate 25. The explosion-proof valve is located on the housing 21 and at one end of the electrode assembly 23 away from the bracket 24. The side support plate 25 is attached to both sides of the electrode assembly 23 along the width direction of the housing 21. The bracket 24 has a vent 245, which is adapted to communicate with the gap between the side support plate 25 and the housing 21. The battery cell 20 also includes: an adapter 26, which is located inside the bracket 24. The adapter 26 holds at least a portion of the folded portion 2312 of the electrode tab 231, and the electrode post 22 extends into the bracket 24. The adapter 26 is connected to the electrode post 22. The outer casing 21 includes a housing 211 and an end cap 212. The end cap 212 is connected to the housing 211 and is used to seal the opening of the housing 211. The pole post 22 is installed on the end cap 212, and the end cap 212 is provided with a first snap-fit ​​structure 2123. The bracket 24 is provided with a second snap-fit ​​structure 244 for snap-fitting with the first snap-fit ​​structure 2123.

[0143] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0144] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0145] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: shell; The pole is installed on the housing; An electrode assembly is disposed inside the housing. The distance from the folded position of the electrode tab to the first side of the housing along the thickness direction is greater than the distance to the second side. The folded portion of the electrode tab is folded towards the first side. A support is disposed between the housing and the electrode assembly, and forms an opening for leading out the tab. The distance from the opening to the first side is greater than the distance to the second side. The folded portion of the tab extends from the opening to be electrically connected to the electrode post.

2. The battery cell according to claim 1, characterized in that, The folding portion of the electrode includes a first section and a second section. The first section extends through the opening, and the second section is located inside the bracket and is electrically connected to the electrode post. The distance from the edge of the opening near the first side to the first side is greater than the distance from the end of the second section away from the first section to the first side.

3. The battery cell according to claim 1, characterized in that, The bracket is inclined away from the surface of the pole post so as to abut the unfolded portion of the pole tab.

4. The battery cell according to any one of claims 1-3, characterized in that, The electrode tabs include a first electrode tab and a second electrode tab located at the same end of the electrode assembly and having opposite polarities. The support includes: An isolator is disposed between the two openings corresponding to the first electrode tab and the second electrode tab, for separating the first electrode tab and the second electrode tab.

5. The battery cell according to claim 4, characterized in that, The end face of the housing has a liquid injection hole, the housing is provided with a baffle adapted to be arranged opposite to the liquid injection hole, and the isolation member is provided with a notch for avoiding the baffle.

6. The battery cell according to any one of claims 1-3, characterized in that, The support has multiple through-holes for filling.

7. The battery cell according to any one of claims 1-3, characterized in that, Also includes: An explosion-proof valve is disposed in the housing and located at the end of the electrode assembly opposite to the bracket; Side support plates are attached to both sides of the electrode assembly along the width direction of the housing; wherein the bracket is provided with an exhaust port, the exhaust port being adapted to communicate with the gap between the side support plates and the housing.

8. The battery cell according to any one of claims 1-3, characterized in that, Also includes: An adapter is disposed within the bracket, clamping at least a portion of the folded portion of the electrode tab, the electrode post portion extending into the bracket, and the adapter being connected to the electrode post.

9. The battery cell according to any one of claims 1-3, characterized in that, The outer casing includes: case; An end cap, connected to the housing, is used to seal the opening of the housing. The pole is installed on the end cap, and the end cap is provided with a first snap-fit ​​structure. The bracket is provided with a second snap-fit ​​structure for snap-fitting with the first snap-fit ​​structure.

10. A battery device, characterized in that, include: Multiple battery cells as described in any one of claims 1-9.

11. An electrical appliance, characterized in that, include: The battery cell as described in any one of claims 1-9 or the battery device as described in claim 10, wherein the battery cell or the battery device is used to store or provide electrical energy.

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