Battery cell, battery device, and electric device

Abstract

The utility model belongs to the technical field of batteries, and provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell, an end cover, an electrode assembly and a bracket; the shell is provided with an inner cavity; the end cover is provided with a positive electrode terminal and a negative electrode terminal, and the end cover is used for sealing the shell; the electrode assembly is arranged in the shell and comprises a positive tab and a negative tab, the positive tab and the negative tab are both located on the side, facing the end cover, of the electrode assembly, the positive tab is connected with the positive electrode terminal, and the negative tab is connected with the negative electrode terminal; the support is arranged between the end cover and the electrode assembly, the positive tab and the negative tab penetrate through the support, the support comprises a partition plate, at least part of the partition plate is arranged between the positive tab and the negative tab, and a communicating hole is formed in the partition plate in the direction from the positive tab to the negative tab. The utility model aims to improve the use stability and reliability of the battery monomer.

Description

Technical Field

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

[0002] With the rise of new energy equipment, represented by new energy vehicles, battery devices have become a key power source. Battery devices include individual battery cells, and multiple individual battery cells can be arranged within the battery device.

[0003] In related technologies, when the positive and negative electrode terminals need to be placed on the same side of the battery cell, the positive and negative tabs of the electrode assembly inside the battery cell are also located on the same side. This can easily lead to instability in the structure and function of the battery cell, especially the structure and function of the tabs, thus affecting the stability and reliability of the battery cell. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, aiming to improve the stability and reliability of the battery cell in use.

[0005] To address the aforementioned problems, in a first aspect, embodiments of this application provide a single battery cell, comprising:

[0006] The shell has an internal cavity;

[0007] An end cap is provided with a positive electrode terminal and a negative electrode terminal, and the end cap is used to seal the housing;

[0008] An electrode assembly, disposed within the housing, includes a positive electrode tab and a negative electrode tab, both located on the side of the electrode assembly facing the end cap. The positive electrode tab is connected to the positive electrode terminal, and the negative electrode tab is connected to the negative electrode terminal.

[0009] A support is disposed between the end cap and the electrode assembly. The positive electrode tab and the negative electrode tab pass through the support. The support includes a partition, which is at least partially disposed between the positive electrode tab and the negative electrode tab in the direction from the positive electrode tab to the negative electrode tab. A connecting hole is provided on the partition.

[0010] The advantage of this embodiment is that it provides a structure in which the positive and negative electrode terminals are located on the same side of the battery cell. At the same time, a support is designed to reduce the risk of structural and functional instability that may occur when the positive and negative electrode tabs are connected to the electrode terminals on the same side, thereby improving the stability of the battery cell.

[0011] In one embodiment of the first aspect, the battery cell further includes a bottom cover disposed on the side of the housing opposite to the end cover, and the side of the bottom cover facing the electrode assembly has a support structure.

[0012] The advantage of this embodiment is that the support structure is located between the bottom cover and the electrode assembly, which is beneficial to the stability of the electrode assembly's position.

[0013] In one embodiment of the first aspect, the support structure comprises plastic.

[0014] The advantage of this embodiment is that, because plastic occupies little space and the connection structure is simple with few auxiliary components, the space occupied by the battery cell in the length direction is low, which is conducive to improving energy density, reducing installation difficulty and simplifying the process.

[0015] In one embodiment of the first aspect, the inner cavity is further provided with a side plate, which is disposed between the electrode assembly and the inner wall of the housing.

[0016] The effect of this embodiment is that it provides support for the electrode assembly, keeps the electrode assembly stable, and can protect the electrode assembly to a certain extent.

[0017] In one embodiment of the first aspect, the side plate is connected to the support structure.

[0018] The advantage of this embodiment is that the side plate and the supporting structure are connected, which facilitates assembly, simplifies the connection process, and improves production efficiency.

[0019] In one embodiment of the first aspect, the bracket is provided with a first through hole, and the positive electrode tab and the negative electrode tab pass through the first through hole.

[0020] The advantage of this embodiment is that the wall of the first through hole can provide some support and positioning for the electrode tab, thereby reducing the risk of deformation or shaking of the electrode tab.

[0021] In one embodiment of the first aspect, at least two first through holes are provided, the positive electrode tab and the negative electrode tab are respectively disposed in different first through holes, and the partition is disposed between the two first through holes through which the positive electrode tab and the negative electrode tab are respectively disposed.

[0022] The advantage of this embodiment is that by passing the positive and negative tabs through different first through holes, the risk of short circuit is reduced. The partition further plays an isolating role, further reducing the risk of short circuit between the positive and negative tabs.

[0023] In one embodiment of the first aspect, the bracket includes a first through hole, the partition is disposed in the first through hole, and the positive electrode tab and the negative electrode tab pass through the first through hole and are respectively located on opposite sides of the partition.

[0024] The advantage of this embodiment is that it simplifies the structure and increases the stability of the support structure. In this case, the partition can be placed in the first through hole, which can also reduce the risk of short circuit.

[0025] In one embodiment of the first aspect, the thickness of the separator is 0.6 mm to 10 mm along the direction from the positive electrode tab to the negative electrode tab.

[0026] The advantage of this embodiment is that the thickness of the partition is set within this range, which neither occupies too much space nor affects the effect of isolating the two types of tabs.

[0027] In some embodiments, the end cap is provided with a liquid injection hole. The advantage of this is that placing the liquid injection hole on the end cap improves the integration of the various functional structures, avoids the need for liquid injection holes in other locations, and reduces structural complexity.

[0028] In some embodiments, the injection hole is disposed opposite to the partition. The effect is that the electrolyte flowing in from the injection hole impacts the partition and is diverted at the partition, thereby improving the electrolyte balance on both sides of the partition.

[0029] In one embodiment of the first aspect, the end cap is further provided with an injection structure corresponding to the injection hole, and the partition is provided with an avoidance notch, which is provided directly opposite to the injection structure and adapted to accommodate the injection structure.

[0030] The advantage of this embodiment is that the stent does not obstruct or interfere with the fluid injection structure.

[0031] In some embodiments, the injection hole is positioned opposite to the bottom wall of the support. This allows the electrolyte to fall onto the bottom wall, preventing impact on the tabs.

[0032] In one embodiment of the first aspect, the length of the clearance notch is 0.5 mm to 2 mm, and the clearance notch is perpendicular to both the direction in which the liquid injection structure is inserted into the clearance notch and the direction in which the positive electrode tab points to the negative electrode tab.

[0033] The advantage of this embodiment is that it provides the dimensions for avoiding the gap, thus meeting the requirements for accommodating the liquid injection structure.

[0034] In one embodiment of the first aspect, the peripheral wall of the bracket is spaced apart from the inner wall of the housing, and the peripheral wall of the bracket is provided with a communication port that connects the space between the peripheral wall of the bracket and the inner wall of the housing.

[0035] The advantages of this embodiment are twofold: firstly, when electrolyte is injected through the injection hole on the end cap, this space can serve as one of the electrolyte inflow channels, facilitating the rapid filling of the electrode assembly with electrolyte; secondly, this space can also serve as a gas flow channel, allowing the gas pressure in various spaces inside the housing to tend to balance, especially preventing excessively high local pressure inside the housing during thermal runaway. This connection port connects the space to the upper and / or lower space of the support.

[0036] In one embodiment of the first aspect, at least one of the communication ports is provided on opposite sides of the peripheral wall of the support along the direction from the positive electrode to the negative electrode.

[0037] The effect of this embodiment is that it enhances the connectivity.

[0038] In one embodiment of the first aspect, the opening area of ​​a single connection port on a first plane is S, satisfying S = C * K / 2, wherein the first plane is a plane perpendicular to the direction from the positive tab to the negative tab, C is the energy storage capacity of the battery cell, and 0 ≤ K ≤ 1.

[0039] The advantage of this embodiment is that it provides the area parameter of the connection port, and the appropriate connection port area can be set for different types of batteries to meet the usage requirements of various batteries.

[0040] In one embodiment of the first aspect, the bracket is detachably connected to the end cap.

[0041] The advantage of this embodiment is that it facilitates disassembly and assembly.

[0042] In one embodiment of the first aspect, the end cap is provided with a hook, the bracket is provided with a locking hole, and the hook is adapted to engage with the locking hole to connect the end cap to the bracket.

[0043] The advantage of this embodiment is that the operation is simple and convenient, and the structure is stable, thanks to the hook-and-hole connection.

[0044] In one embodiment of the first aspect, the hook is provided with a first locking surface, and the hole wall of the card hole is provided with a second locking surface. Along the axial direction of the card hole, the hook can be adapted to be inserted into the card hole so that the first locking surface is located below the second locking surface and is used to abut against the second locking surface.

[0045] The advantage of this embodiment is that the first and second locking surfaces can be mutually locked by means of a hook and a hole, which is simple and convenient to operate and has a stable structure.

[0046] In one embodiment of the first aspect, the second locking surface is an annular surface, and there is an interfering overlapping area between the first locking surface and the second locking surface; a gap is formed between the first locking surface and the second locking surface along the axial direction of the locking hole.

[0047] In one embodiment of the first aspect, the length of the interference overlap region along the radial direction of the card hole is 0.3 mm to 0.4 mm, and the height of the gap along the axial direction of the card hole is 0.05 mm to 0.5 mm.

[0048] The advantage of this embodiment is that the length D2 ranges from 0.3mm to 0.4mm, which effectively prevents disengagement while minimizing interference length, thus simplifying the structure. Furthermore, a length D3 of 0.05mm to 0.5mm is provided, where the first and second locking surfaces are not completely flush in the axial direction of the locking hole, but rather have a gap, creating redundancy. This redundancy reduces the rigid contact or friction between the first and second locking surfaces during normal use of the battery cell. Under normal conditions, there is generally no force between the bracket and the end cap that would cause them to separate. Therefore, the first and second locking surfaces are not always in complete contact; they only need to be able to lock together when a separation force is generated under specific circumstances. This gap is provided, and its existence does not affect the locking function of the first and second locking surfaces. When a separation force is generated, the first and second locking surfaces can contact each other to prevent disengagement.

[0049] In one embodiment of the first aspect, the card hole is a stepped hole, and the second card position surface is the stepped surface of the card hole.

[0050] The advantage of this embodiment is that it provides a card slot structure that is simple in structure and convenient in positioning.

[0051] In one embodiment of the first aspect, a plurality of hooks are provided at intervals on the end cap along the circumference of the card hole, with gaps between adjacent hooks. The hooks are elastic, and the plurality of hooks are used to simultaneously engage with the card hole. During the engagement process, the gaps between adjacent hooks are reduced by compression, and after insertion, the gaps between adjacent hooks return to their state before engagement.

[0052] The advantage of this embodiment is that external force is required to deform the hook and release the resistance, thus strengthening the reliability of the connection between the end cap and the bracket.

[0053] In one embodiment of the first aspect, the bracket is further provided with a guide hole for guiding the hook into the locking hole, and the wall of the guide hole is used to squeeze the hook to reduce the gap between adjacent hooks when the hook moves axially along the locking hole.

[0054] The advantage of this embodiment is that it simplifies the insertion process, making the insertion accurate and convenient.

[0055] In one embodiment of the first aspect, the bracket is further provided with a second through hole, the second through hole being used to connect the space on the side where the end cap of the bracket is located and the space on the side where the electrode assembly is located.

[0056] The advantage of this embodiment is that the setting of the second through hole further ensures the interconnection of various spaces inside the shell, especially the upper and lower spaces of the support, so that the air pressure inside the shell is balanced, and it is also conducive to the flow of electrolyte.

[0057] In one embodiment of the first aspect, the electrode assembly includes a positive electrode and a negative electrode stacked together, with the positive electrode tab disposed on the positive electrode and the negative electrode tab disposed on the negative electrode.

[0058] The advantage of this embodiment is that it uses a stacked arrangement of positive and negative electrode plates, which is more suitable for the same-side electrode tab arrangement, resulting in better space occupation of the electrode tab and easier shaping and positioning of the electrode tab by the support.

[0059] In one embodiment of the first aspect, the housing is cuboid in shape, the housing includes a first side, a second side, and a third side; the length of the second side is less than the length of the first side and greater than the length of the third side, the housing has an opening, the second side and the third side are located at the opening, and the end cap covers the opening.

[0060] The advantage of this embodiment is that it provides a structural form for the housing. The rectangular housing is more suitable for the stacked electrode design. The end cap is located at the opening formed by the two shorter sides, which simplifies the structural dimensions of the support and the end cap, makes assembly easier, and reduces the drawbacks of unreasonable structural assembly.

[0061] In one embodiment of the first aspect, the length of the first side is in the range of 200mm to 400mm, and / or the length of the second side is in the range of 90mm to 150mm, and / or the length of the third side is in the range of 20mm to 50mm.

[0062] The advantage of this embodiment is that it provides a suitable housing size for battery cells with positive and negative tabs located on the same side, ensuring the stability and reliability of the structure and the current carrying capacity of the tabs.

[0063] In one embodiment of the first aspect, the length of the first side is in the range of 250 to 320 mm, and / or the length of the second side is in the range of 100 mm to 120 mm.

[0064] This embodiment provides a further range of dimensions within which structural stability and functional reliability can be better guaranteed.

[0065] In one embodiment of the first aspect, the length L1 of the side of the bracket parallel to the second side and the length W of the second side satisfy 90% * W < L1 < (W - 2 mm);

[0066] And / or, the length T1 of the side of the bracket parallel to the third side satisfies 80% * T < T1 < (T - 2 mm) with respect to the length T of the third side.

[0067] The advantage of this embodiment is that by setting the maximum length of the two sides of the support to be 2mm smaller than the lengths of the second and third sides of the housing, the support can be accommodated within the housing. In some cases, this also allows a gap to form between the peripheral wall of the support and the inner wall of the housing, which facilitates electrolyte injection and maintains pressure balance throughout the housing. By setting the minimum length of the two sides of the support to be greater than 90% and 80% of the lengths of the second and third sides of the housing, respectively, a redundancy, i.e., a gap, exists between the peripheral wall of the support and the inner wall of the housing, without making the gap too wide, thus maintaining the stability of the support.

[0068] Secondly, this application also provides a battery device, including the battery cell described in any of the embodiments.

[0069] Thirdly, this application also provides an electrical device, including the battery device described in the above embodiments.

[0070] 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

[0071] 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:

[0072] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0073] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0074] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0075] Figure 4 This is an exploded view of the internal structure of a battery cell provided in some embodiments of this application;

[0076] Figure 5 This is a schematic diagram of the housing structure of a battery cell provided in some embodiments of this application;

[0077] Figure 6 Schematic diagrams of the structure of the bracket provided in some embodiments of this application;

[0078] Figure 7 This is a schematic diagram of the end cap structure provided in some embodiments of this application;

[0079] Figure 8 A top view of a single battery cell provided in some embodiments of this application;

[0080] Figure 9 For along Figure 8 A partial schematic diagram of the cross-sectional structure along line aa in the middle;

[0081] Figure 10 for Figure 9 Enlarged view of point A in the middle;

[0082] Figure 11 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0083] Figure 12 Cross-sectional views of a battery cell (excluding the casing and bottom cover) provided for some embodiments of this application.

[0084] The reference numerals in the detailed embodiments are as follows:

[0085] 1000, vehicles;

[0086] 100. Battery assembly; 200. Controller; 300. Motor;

[0087] 10. Battery cell; 20. Casing; 201. First side; 202. Second side; 203. Third side;

[0088] 30. End cap; 301. Hook; 302. First locking surface; 303. Liquid injection structure; 304. Positive electrode terminal; 305. Negative electrode terminal;

[0089] 40. Electrode assembly; 401. Positive electrode tab; 402. Negative electrode tab;

[0090] 50. Bracket; 503. First through hole; 504. Second through hole; 505. Partition; 506. Clearance notch; 507. Connecting opening; 508. Locking hole; 509. Second locking surface; 510. Guide hole; 511. Connecting hole;

[0091] 60. Bottom cover;

[0092] 70. Plastics;

[0093] 80. Base frame;

[0094] 90. Side panels. Detailed Implementation

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] In the description of the embodiments 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0100] 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).

[0101] 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.

[0102] 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.

[0103] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery application areas, the market demand is also constantly increasing.

[0104] A battery device may include multiple battery cells, each comprising an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell operates by the movement of metal ions between the positive and negative electrodes. The electrolyte serves as the carrier for ion transport within the battery, acting as a conductor between the positive and negative electrodes. Both the electrode assembly and the electrolyte are housed within a casing. After the electrode assembly is installed, the casing is covered by an end cap structure, and electrolyte is injected through the injection port in the end cap structure. After injection, the injection port is sealed, for example, by welding aluminum nails to the end cap structure to seal the injection port.

[0105] The blade battery cells are long and thin.

[0106] The short-blade battery is about 40% shorter than the long-blade battery. The structural design of the short-blade battery results in lower internal resistance and less heat generation, thus effectively improving the battery's stability during use.

[0107] Furthermore, the short-blade battery utilizes a wet-process double-coated separator, improving its flexibility and thermal shrinkage performance, effectively reducing the risk of thermal runaway. The positive electrode material employs multi-element doping, increasing energy density and ionic conductivity, stabilizing the material structure, and enhancing cycle performance. The negative electrode material has been optimized, using small particles to shorten the lithium-ion diffusion distance and increase the electrolyte wetting area, thereby improving the battery's cycle performance and conductivity. The energy density of the short-blade battery has been increased to nearly 200 Wh / kg, with a cell cycle life of 3500 cycles. Therefore, the application of short-blade batteries is becoming increasingly widespread.

[0108] In traditional structures, short-blade batteries, especially short-blade stacked batteries, typically feature a design with terminals on both sides. For example, when the battery cell is in use, the positive and negative terminals are located on the left and right sides of the cell, respectively, or on the top and bottom sides. This is based on system configuration habits or to facilitate parallel or series connection of the battery cells. However, in some cases, the development of new systems requires placing the positive and negative terminals on the same side of the battery cell, or to improve the internal space utilization of the cell, it is also necessary to place the positive and negative terminals on the same side to improve the structural space utilization. However, when the positive and negative terminals are placed on the same side, the positive and negative tabs are also located on the same side. Because the positive and negative tabs are concentrated on one side, the structural stability of the tabs is poor, and there is a risk of short circuit, which affects the stability of the battery cell.

[0109] Based on this, this application provides a battery cell, a battery device, and an electrical device, aiming to provide a short-blade stacked battery design structure with the same-side output terminal post, so as to improve the stability when the positive and negative terminals are set on the same side.

[0110] Please see Figures 2-10 This application provides a battery cell 10, including a housing 20, an end cap 30, an electrode assembly 40, and a support 50.

[0111] The housing 20 has an inner cavity; the end cap 30 is provided with a positive electrode terminal 304 and a negative electrode terminal 305, and the end cap 30 is used to cover the housing 20; the electrode assembly 40 is disposed inside the housing 20, and the electrode assembly 40 includes a positive electrode tab 401 and a negative electrode tab 402, both of which are located on the side of the electrode assembly 40 facing the end cap 30. The positive electrode tab 401 is connected to the positive electrode terminal 304, and the negative electrode tab 402 is connected to the negative electrode terminal 305; the bracket 50 is disposed between the end cap 30 and the electrode assembly 40, and the positive electrode tab 401 and the negative electrode tab 402 pass through the bracket 50. The bracket 50 includes a partition 505, which is at least partially disposed between the positive electrode tab 401 and the negative electrode tab 402 in the direction from the positive electrode tab 401 to the negative electrode tab 402. A connecting hole 511 is provided on the partition 505.

[0112] Specifically, the electrode assembly 40 includes a positive electrode plate and a negative electrode plate. The positive electrode tab 401 of the positive electrode plate and the negative electrode tab 402 of the negative electrode plate are both located on the side of the electrode assembly 40 facing the end cover 30, and are used to connect the positive electrode terminal 304 and the negative electrode terminal 305, respectively. The positive electrode terminal 304 and the negative electrode terminal 305 are the positive electrode post and the negative electrode post, respectively. The bracket 50 is used to support and position the electrode tabs.

[0113] The housing 20 has an inner cavity forming a space to accommodate the electrode assembly 40. The electrode assembly 40 includes a positive electrode plate, a negative electrode plate, and a separator. Both the positive and negative electrode plates have tabs located on the same side of the electrode assembly 40. When the electrode assembly 40 is placed in the inner cavity of the housing 20, the positive tab 401 and the negative tab 402 are located on the side of the electrode assembly 40 facing the end cover 30. The end cover 30 has a positive electrode terminal 304 and a negative electrode terminal 305. The positive tab 401 is connected to the positive electrode terminal 304, and the negative tab 402 is connected to the negative electrode terminal 305. This ensures that the positive and negative electrode terminals of the battery cell 10 are located on the same side. The end cover 30 serves to house the positive electrode terminal 304 and the negative electrode terminal 305, and also to cover and seal the housing 20.

[0114] Since the positive tab 401 and the negative tab 402 are located on the same side, they need to be connected to the positive electrode terminal 304 and the negative electrode terminal 305 respectively. This increases the number of tabs on the same side of the battery cell 10, making it difficult to control the stability of the tabs and potentially causing displacement or inversion. Therefore, in response to this possibility, the battery cell 10 in this embodiment also provides a bracket 50. The bracket 50 is disposed between the end cap 30 and the electrode assembly 40. The bracket 50 can be located inside the housing 20. The tabs need to pass through the bracket 50 before being connected to the corresponding electrode terminals. In this way, the bracket 50 can also support and position the tabs that pass through.

[0115] In this embodiment, a partition 505 is also provided on the bracket 50. The partition 505 serves to electrically isolate the positive electrode tab 401 and the negative electrode tab 402, reducing the risk of short circuit and increasing the stability of the tab function. A connecting hole 511 is also provided on the partition 505. The connecting hole 511 is oriented so that the positive electrode tab 401 points towards the negative electrode tab 402. Figure 6 The X direction in the middle connects the spaces on both sides of the separator 505, which is conducive to the flow of electrolyte and maintains the uniform distribution of electrolyte on both sides, thus enhancing the stability of the function of the battery cell 10.

[0116] This embodiment provides a structure in which the positive and negative electrode terminals are located on the same side of the battery cell 10. At the same time, a bracket 50 is designed to reduce the risk of structural and functional instability that may occur when the positive and negative electrode tabs are connected to the electrode terminals on the same side, thereby improving the stability of the battery cell 10.

[0117] In some embodiments, please refer to Figure 4 The battery cell 10 also includes a bottom cover 60, which is located on the side of the housing 20 opposite to the end cover 30. The bottom cover 60 has a support structure on the side facing the electrode assembly 40.

[0118] A bottom cover 60 is also provided on the side of the housing 20 opposite to the end cover 30 to form a closed inner cavity of the housing 20.

[0119] Since the housing 20 is sealed, not only does the end cap 30 need to seal the housing 20 on one side, but the housing 20 on the opposite side of the end cap 30 also needs to be sealed. Therefore, a bottom cover 60 is provided on the opposite side of the end cap 30, thus forming a complete sealed inner cavity. The support structure is located between the bottom cover 60 and the electrode assembly 40, which is beneficial to the stability of the electrode assembly 40's position.

[0120] In some embodiments, such as Figure 11 The supporting structure includes a plastic 70. The plastic 70 is disposed between the bottom cover 60 and the electrode assembly 40, and the bottom cover 60 is sealed to the housing 20.

[0121] The advantage of this embodiment is that, since the plastic 70 occupies little space and has a simple connection structure with few auxiliary components, the battery cell 10 occupies little space in the length direction, which is beneficial to improving energy density, reducing installation difficulty, and lowering the complexity of the process.

[0122] In some embodiments, such as Figure 12 The support structure includes a base frame 80, which is located between the bottom cover 60 and the electrode assembly 40. The bottom cover 60 is sealed to the housing 20. Figure 12 The middle housing 20 and the bottom cover 60 are not shown.

[0123] This embodiment provides a support structure including a base frame 80, which has the advantages of good support effect, stability and structural strength.

[0124] In some embodiments, please refer to Figure 4 The inner cavity is also provided with a side plate 90, which is located between the electrode assembly 40 and the inner wall of the housing 20.

[0125] The side plate 90 can be set on the inner wall of one side formed by the first side 201 and the third side 203 of the housing 20, which plays a supporting role for the electrode assembly 40, keeps the electrode assembly 40 stable, and can protect the electrode assembly 40 to a certain extent.

[0126] In some embodiments, the side plate 90 is connected to the support structure.

[0127] When the side plate 90 is provided, it can be connected to the support structure, which is equivalent to providing protection for the sides and bottom of the electrode assembly 40, and then the bottom cover 60 is provided for sealing.

[0128] The advantage of this embodiment is that the side plate 90 is connected to the support structure, which facilitates assembly, simplifies the connection process, and improves production efficiency.

[0129] In some embodiments, such as Figure 6 and Figure 9 The bracket 50 is provided with a first through hole 503, through which the positive electrode tab 401 and the negative electrode tab 402 pass.

[0130] The support 50 has a first through hole 503 for the electrode tab to pass through, and the sidewall of the first through hole 503 is used to support and position the electrode tab that passes through.

[0131] Specifically, the tab needs to pass through the bracket 50 before connecting to the electrode terminal on the end cap 30. Therefore, a first through hole 503 is provided on the bracket 50. The first through hole 503 is used for the tab to pass through. After passing through, the hole wall of the first through hole 503 can provide a certain support and positioning for the tab, thereby reducing the risk of the tab deforming or shaking.

[0132] Understandably, in the embodiments of this application, the wall of the first through hole 503 can contact the side wall of the electrode tab inserted inside, thereby supporting the positive electrode tab 401 and the negative electrode tab 402. Alternatively, the wall of the first through hole 503 can also have a small gap with the side wall of the electrode tab inserted inside, which facilitates the insertion of the electrode tab while providing a certain space for the electrode tab to move and reducing the risk of electrode tab deformation.

[0133] In this embodiment, the shape of the first through hole 503 is adapted to the shape of the electrode tab. For example, it can be rectangular to accommodate a rectangular electrode tab, facilitating the passage of the rectangular electrode tab.

[0134] In some embodiments, such as Figure 6 and Figure 9 The first through hole 503 has at least two holes, and the positive electrode tab 401 and the negative electrode tab 402 are respectively inserted through different first through holes 503. The bracket 50 has a partition 505 for electrically isolating the positive electrode tab 401 and the negative electrode tab 402, and the partition 505 is disposed between the two first through holes 503 through which the positive electrode tab 401 and the negative electrode tab 402 are respectively inserted.

[0135] Two first through holes 503 can be provided, and the two first through holes 503 can be used to pass through the positive tab 401 and the negative tab 402 respectively. In this way, the positive and negative tabs are respectively connected to the two first through holes 503, which also has the effect of isolation and reduces the risk of short circuit.

[0136] The advantage of this embodiment is that the positive electrode tab 401 and the negative electrode tab 402 are respectively passed through different first through holes 503, so as to reduce the risk of short circuit.

[0137] In this embodiment, in addition to the positive electrode 401 and the negative electrode 402 being located between different first through holes 503, a partition 505 is also provided between the two first through holes 503 through which the positive electrode 401 and the negative electrode 402 respectively pass, which further plays the role of isolation and further reduces the risk of short circuit between the positive and negative electrodes.

[0138] In some embodiments, such as Figure 6 and Figure 9 The bracket 50 includes a first through hole 503, a partition 505 is disposed in the first through hole 503, and a positive electrode tab 401 and a negative electrode tab 402 pass through the first through hole 503 and are respectively located on opposite sides of the partition 505.

[0139] In this embodiment, the positive and negative tabs can be located in the same first through hole 503, or a partition 505 can be provided. The partition 505 is located in the first through hole 503. By placing the partition 505 between the positive and negative tabs, the two can be isolated, reducing the risk of short circuit.

[0140] The advantage of this embodiment is that a partition 505 is provided between the positive and negative tabs. The partition 505 is used to separate the positive and negative tabs, which further reduces the risk of short circuit between the positive tab 401 and the negative tab 402 to a certain extent. In addition, the design of a first through hole 503 simplifies the structure and increases the stability of the support structure 50.

[0141] In this embodiment, the partition 505 can span the first through hole 503 and isolate the positive and negative electrodes.

[0142] The partition 505 can be in the shape of a cuboid and be made of insulating material.

[0143] In some embodiments, such as Figure 6 In the middle, along the direction from the positive electrode tab 401 to the negative electrode tab 402, the thickness of the separator 505 is 0.6mm to 10mm.

[0144] The direction in which the positive electrode tab 401 points to the negative electrode tab 402 can be a first direction, in which the thickness D1 of the partition 505 is 0.6mm to 10mm. The first direction is... Figure 6 The X direction in the equation.

[0145] The direction from the positive electrode 401 to the negative electrode 402 can be understood as the direction of the line connecting the positive electrode 401 and the negative electrode 402.

[0146] Specifically, this embodiment provides the dimensions of the separator 505. The positive electrode tab 401 and the negative electrode tab 402 need to be separated by the separator 505. Due to the limited space within the casing 20 of the battery cell 10, the thickness of the separator 505 should not be too large, but at the same time, it should not be too small to ensure the isolation effect. Based on this, this embodiment provides a thickness range D1 of 0.6mm to 10mm for the separator 505. The effect is that by setting the thickness of the separator 505 within this range, it will not occupy too much space, nor will it affect the isolation effect of the two electrodes.

[0147] The D1 can be selected from 0.6mm, 0.8mm, 1mm, 2mm, 5mm, 8mm, and 10mm, depending on the number of tabs and the type of battery.

[0148] In some embodiments, the end cap 30 is provided with an injection hole for injecting electrolyte. The effect is that by placing the injection hole on the end cap 30, the integration of various functional structures is improved, and the injection hole is avoided in other locations, thus reducing the complexity of the structure.

[0149] In some embodiments, the injection hole is disposed opposite to the partition 505. Specifically, after the end cap 30 is installed, the injection hole is opposite to the partition 505, so that the electrolyte flowing in from the injection hole will impact the partition 505 and be diverted at the partition 505, thereby improving the balance of electrolyte on both sides of the partition 505.

[0150] In some embodiments, such as Figure 6 , Figure 7 and Figure 9The end cap 30 is also provided with an injection structure 303 corresponding to the injection hole. The partition 505 is provided with a clearance notch 506, which is set and adapted to accommodate the injection structure 303.

[0151] Specifically, after the battery cell 10 is assembled, that is, after the end cap 30 is sealed onto the housing 20, electrolyte needs to be injected. Therefore, an injection hole for injecting electrolyte is reserved on the end cap 30. At the same time, an injection structure 303 is also provided on the side of the end cap 30 facing the electrode assembly 40 corresponding to the injection hole. The injection structure 303 can guide the electrolyte or reduce the impact of the electrolyte. The injection structure 303 has a certain volume. After the end cap 30 is installed, in order to prevent interference between the injection structure 303 and the support 50, a clearance notch 506 is provided on the separator 505. After the end cap 30 is connected to the housing 20, the injection structure 303 can be inserted into the clearance notch 506, so that the support 50 will not block or interfere with the injection structure 303. At the same time, the electrolyte can flow through the injection structure 303 to the separator 505, thereby diverting to both sides of the separator 505.

[0152] In some embodiments, the injection hole is disposed opposite to the bottom wall of the support 50.

[0153] Specifically, this embodiment also provides that the injection hole can be set opposite to the bottom wall of the support 50, that is, it is not set opposite to the hole on the support 50, nor opposite to the partition 505, but opposite to the bottom wall of the support 50. The bottom wall is a plate structure that forms the support 50, such as the bottom plate of the support 50. The effect of this is that the electrolyte falls onto the bottom wall, which can avoid impact on the tab.

[0154] In some embodiments, such as Figure 6 The length of the clearance notch 506 is 0.5mm to 2mm, and it is perpendicular to both the direction of the insertion clearance notch 506 of the liquid injection structure 303 and the direction of the positive electrode tab 401 pointing to the negative electrode tab 402.

[0155] Specifically, the direction perpendicular to both the direction of the insertion clearance notch 506 of the injection structure 303 and the direction from the positive electrode tab 401 to the negative electrode tab 402 can be defined as the second direction. The length D4 of the clearance notch 506 in the second direction is 0.5mm to 2mm. Figure 6 The Y direction in the middle. The direction of the insertion clearance notch 506 into the injection structure 303 can be... Figure 6 The Z direction in the equation can be defined as the third direction.

[0156] This embodiment provides specific dimensions for the clearance notch 506, namely, a length of 0.5mm to 2mm in the second direction. This satisfies the requirements for accommodating the liquid injection structure 303. In the aforementioned first direction, the clearance notch 506 can penetrate the partition 505.

[0157] The advantage of this embodiment is that it provides the dimensions of the clearance notch 506, which meets the requirements for accommodating the liquid injection structure 303.

[0158] In some embodiments, such as Figure 6 , Figure 9 and Figure 10 The peripheral wall of the bracket 50 is spaced apart from the inner wall of the housing 20. The peripheral wall of the bracket 50 is provided with a connecting port 507, which connects the space between the peripheral wall of the bracket 50 and the inner wall of the housing 20.

[0159] A space is formed between the peripheral wall of the bracket 50 and the inner wall of the housing 20. A connecting port 507 is provided on the peripheral wall of the bracket 50. The connecting port 507 is used to connect this space, that is, this space is connected to the space of the housing 20 on the upper and / or lower side of the bracket 50 through the connecting port 507.

[0160] Specifically, the bracket 50 is not tightly fitted to the inner wall of the housing 20 when it is installed inside the housing 20, in order to maintain a certain gap space. A connecting port 507 is provided to connect it to other spaces. Its function is twofold: firstly, when electrolyte is injected through the injection hole on the end cap 30, this gap space serves as one of the electrolyte inflow channels, facilitating the rapid filling of the electrode assembly 40 with electrolyte; secondly, this gap space also serves as a gas flow channel, allowing the gas pressure in various spaces inside the housing 20 to tend towards equilibrium, especially preventing excessively high local pressures within the housing 20 in the event of thermal runaway. This connecting port 507 connects the gap space to the upper and / or lower spaces of the bracket 50.

[0161] The connecting port 507 can be a notch provided on the periphery of the support 50, and the notch extends through the upper or lower end of the periphery of the support 50.

[0162] In some embodiments, such as Figure 6 Along the direction from the positive electrode tab 401 to the negative electrode tab 402, at least one connecting port 507 is provided on each of the opposite sides of the peripheral wall of the support 50. The direction from the positive electrode tab 401 to the negative electrode tab 402 can be defined as a first direction. Figure 6 In the X direction.

[0163] Specifically, there is an annular space between the peripheral wall of the bracket 50 and the inner wall of the housing 20, so at least one communication port 507 is provided on each of the opposite sides of the peripheral wall of the bracket 50, which enhances the communication effect.

[0164] In some embodiments, such as Figure 6 The opening area of ​​a single connecting port 507 on the first plane is S, which satisfies S=C*K / 2, where the first plane is a plane perpendicular to the direction from the positive tab 401 to the negative tab 402, C is the energy storage capacity of the battery cell 10, and 0≤K≤1.

[0165] Specifically, the direction in which the positive electrode 401 points to the negative electrode 402 is the first direction mentioned above, specifically as follows: Figure 6 The X direction in the diagram. The first plane is a plane perpendicular to the first direction.

[0166] This embodiment provides the opening size of the connecting port 507, that is, the opening area, specifically S. S has a certain range of values, namely S = C * K / 2. For each battery cell 10, it has a certain amount of electrical energy storage, or energy storage capacity, which is C. The opening area is set according to its energy storage capacity, and the value of K is 0 ≤ K ≤ 1. K is a coefficient, and its specific value depends on the type of battery cell 10. Battery cells 10 include battery types such as lithium iron phosphate batteries and ternary lithium batteries. Ternary lithium batteries are further divided into different series, including 5-series, 8-series, and 9-series battery types. The chemical reaction intensity of different types of batteries is different, so the value of K is also different. The more intense the reaction, the larger the value of K.

[0167] The advantage of this embodiment is that it provides the area parameter of the connection port 507, so that the appropriate area of ​​the connection port 507 can be set for different types of batteries to meet the usage requirements of various batteries.

[0168] In some embodiments, the bracket 50 is detachably connected to the end cap 30.

[0169] Specifically, the bracket 50 and the end cap 30 are detachably connected, which facilitates assembly and disassembly. The detachable connection can be one or more of the following: snap-fit, locking, riveting, and threaded connection.

[0170] In some embodiments, such as Figure 6 , Figure 9 and Figure 10 The end cap 30 is provided with a hook 301, and the bracket 50 is provided with a hole 508. The hook 301 and the hole 508 are adapted to engage so that the end cap 30 and the bracket 50 are connected.

[0171] Specifically, this embodiment provides a hook 301 on the end cap 30 and a hole 508 on the bracket 50. When the end cap 30 and the hole 508 are assembled, the hook 301 can be inserted into the hole 508, i.e., inserted. The insertion is achieved through the hook 301 and the hole 508.

[0172] The advantage of this embodiment is that the operation is simple and convenient, and the structure is stable, by inserting the hook 301 into the card hole 508.

[0173] In some embodiments, such as Figure 6 , Figure 9 and Figure 10 The hook 301 is provided with a first locking surface 302, and the hole wall of the hole 508 is provided with a second locking surface 509. Along the axial direction of the hole 508, the hook 301 can be adapted to be inserted into the hole 508 so that the first locking surface 302 is located below the second locking surface 509 and is used to abut against the second locking surface 509.

[0174] Specifically, the hook 301 is provided with a first locking surface 302, and the bracket 50 is provided with a second locking surface 509. The first locking surface 302 and the second locking surface 509 can be locked together to prevent the end cap 30 from separating from the bracket 50. Locking means that the first locking surface 302 and the second locking surface 509 abut against each other to prevent the bracket 50 and the end cap 30 from separating.

[0175] The first carding surface 302 is set on the card hook 301, and the second carding surface 509 is set in the card hole 508. When the card hook 301 is inserted into the card hole 508, the first carding surface 302 and the second carding surface 509 are set relative to each other and abut against each other, preventing the card hook 301 from coming out of the card hole 508.

[0176] The hook 301 can be an elongated structure. The first locking surface 302 can be formed at the end of the hook 301, or in other words, the first locking surface 302 can be formed at the hook head of the hook 301. The first locking surface 302 can be flat, while the second locking surface 509 is formed on the wall of the locking hole 508, or in other words, the second locking surface 509 is part of the wall of the locking hole 508. When the hook 301 is inserted into the locking hole 508, the hook 301 hooks onto the wall of the locking hole 508, that is, the first locking surface 302 locks onto the second locking surface 509, achieving mutual contact.

[0177] The structure provided in this embodiment is simple, easy to operate, and has significant effects.

[0178] In some embodiments, such as Figure 6 , Figure 9 and Figure 10 The second locking surface 509 is an annular surface, and there is an interference overlap area between the first locking surface 302 and the second locking surface 509; along the axial direction of the locking hole 508, a gap is formed between the first locking surface 302 and the second locking surface 509.

[0179] The second locking surface 509 is an annular surface, and there is an interference overlap area between a single first locking surface 302 and the second locking surface 509; the axial direction of the locking hole 508 can be understood as the direction in which the hook 301 engages and disengages from the locking hole 508, and the axial direction of the locking hole 508 is defined as the third direction, which is... Figure 6 In the Z direction, a gap is formed between the first locking surface 302 and the second locking surface 509 in the third direction.

[0180] The end cap 30 and the bracket 50 are mutually locked by the first locking surface 302 and the second locking surface 509. Specifically, when the end cap 30 and the bracket 50 are separated, the first locking surface 302 and the second locking surface 509 will abut or lock each other, thereby preventing them from separating.

[0181] In this embodiment, the second locking surface 509 is an annular surface with a hole in the middle. This hole can be used for the insertion of the hook 301. Once inserted, the first locking surface 302 of the hook 301 is positioned opposite to the second locking surface 509, thus achieving locking.

[0182] The interference overlap area refers to the overlap area between the first locking surface 302 and the second locking surface 509. The existence of this area allows the first locking surface 302 and the second locking surface 509 to form a locking mechanism, restricting the hook 301 from being pulled out of the locking hole 508. Simultaneously, in the third direction (axial direction of the locking hole 508), there can be a certain amount of redundancy between the first locking surface 302 and the second locking surface 509, i.e., the aforementioned gap. This reduces the rigid contact or friction between the first locking surface 302 and the second locking surface 509 during normal use of the battery cell 10, because no force causing the bracket 50 and the end cap 30 to separate occurs during normal use, and it is unnecessary to keep the first locking surface 302 and the second locking surface 509 in constant contact.

[0183] In some embodiments, such as Figure 10 Along the radial direction of the grommets 508, the length D2 of the interference overlap region is 0.3mm to 0.4mm, and along the axial direction of the grommets 508, the height D3 of the gap is 0.05mm to 0.5mm.

[0184] This interference overlap region has a certain length in the radial direction of the clasp 508, which is also the radial direction of the annular surface. This embodiment provides a specific dimension for this length, specifically, the length D2 is 0.3mm to 0.4mm. The axial direction of the clasp 508 is perpendicular to its radial direction, and the axial direction of the clasp 508 is defined as a third direction (e.g.,...). Figure 6In the Z direction, a gap is formed between the first locking surface 302 and the second locking surface 509 in the axial direction of the locking hole 508. This gap also has a size range, specifically D3, ranging from 0.05mm to 0.5mm. That is, in the use state, the first locking surface 302 and the second locking surface 509 do not directly contact each other, but there is a certain gap.

[0185] The advantage of this embodiment is that the length D2 ranges from 0.3mm to 0.4mm, which can effectively prevent detachment by locking the device while keeping the interference length as small as possible, thus simplifying the structure. Furthermore, a length D3 of 0.05mm to 0.5mm is provided. The first locking surface 302 and the second locking surface 509 are not completely fitted together in the axial direction of the locking hole 508, but have a gap, forming a redundancy. Due to the existence of this redundancy, the hard contact between the first locking surface 302 and the second locking surface 509 is reduced or friction is reduced during normal use of the battery cell 10. Under normal conditions, there is generally no force between the bracket 50 and the end cap 30 that would cause them to separate relative to each other. Therefore, it is necessary to avoid the first locking surface 302 and the second locking surface 509 being completely and constantly in contact. It is only necessary to ensure that the first locking surface 302 and the second locking surface 509 can be locked together when a separation force is generated under specific circumstances. Therefore, a gap is set, and the existence of this gap will not affect the locking function of the first locking surface 302 and the second locking surface 509. When a separation force is generated, the first locking surface 302 and the second locking surface 509 can contact each other to avoid separation.

[0186] In some embodiments, such as Figure 10 The card hole 508 is a stepped hole, and the second carding surface 509 is the stepped surface of the card hole 508.

[0187] Specifically, this embodiment provides the specific shape of the card hole 508, which is a transparent stepped hole. It can be inverted, with the upper hole being smaller and the lower hole being larger. This forms a stepped surface between the two. This stepped surface is the annular surface, which is the second carding surface 509. The smaller hole is also the center hole of the annular surface. When the hook 301 enters and passes through the smaller hole, the first carding surface 302 and the second carding surface 509 form an interference overlap area, thereby achieving carding.

[0188] The advantage of this embodiment is that it provides a simple and convenient card slot 508 structure.

[0189] In some embodiments, such as Figure 10Multiple hooks 301 are spaced apart on the circumferential end cap 30 along the card hole 508. There is a gap between adjacent hooks 301. The hooks 301 are elastic. Multiple hooks 301 are used to simultaneously engage with the card hole 508. During the engagement process, the gap between adjacent hooks 301 is reduced by compression and after insertion, the gap between adjacent hooks returns to the state before engagement.

[0190] Specifically, the hook 301 includes a natural state and a deformed state. When the first locking surface 302 and the second locking surface 509 are in contact, the hook 301 is in the natural state. At this time, the gap between adjacent hooks 301 is in the normal state. During the process of inserting or pulling the hook 301 into the locking hole 508, the hook 301 is in the deformed state, that is, the gap is reduced during this process. This setting ensures that when the hook 301 is inserted into the locking hole 508, the hook 301 will not come out of the locking hole 508 without external force to deform it.

[0191] Specifically, the latch 301 is elastic. In its natural state, the latch 301 will not deform. Its natural state is when the first latching surface 302 and the second latching surface 509 are in contact, preventing the end cap 30 and the bracket 50 from separating. To release this contact, the latch 301 needs to undergo elastic deformation, allowing it to be pulled out of the latching hole 508. Similarly, the latch 301 will also deform during insertion into the latching hole 508, returning to its natural state after reaching its final position. When it is necessary to separate the bracket 50 and the end cap 30, the latch 301 is moved to misalign the first latching surface 302 with the second latching surface 509 before being pulled out.

[0192] During the insertion of the hook 301, the hook 301 undergoes a certain deformation. After insertion, the hook 301 returns to its original state. At this time, the first locking surface 302 hooks the second locking surface 509 to prevent it from disengaging. When the hook 301 is to be disengaged from the locking hole 508, the hook 301 can be moved to make the first locking surface 302 and the second locking surface 509 misaligned. Then the hook 301 can be pulled out to separate the bracket 50 from the end cover 30.

[0193] The effect of this embodiment is that external force is required to deform the hook 301 and release the resistance, which strengthens the reliability of the connection between the end cap 30 and the bracket 50.

[0194] In addition, there are multiple 301 hooks, such as Figure 10 There are at least two hooks 301 inserted into the card slot 508, and the first carding surface 302 of the multiple hooks 301 forms an interference overlap area at different positions of the second carding surface 509 in the annular direction.

[0195] Specifically, there are at least two hooks 301, thus forming at least two interference overlap regions in the circumferential direction.

[0196] Firstly, increasing the number of hooks 301 improves the reliability of the connection. Secondly, when the first locking surface 302 and the second locking surface 509 need to release their contact, the hooks 301 need to deform. To prevent the situation where the contact is released due to the movement of the end cap 30 relative to the bracket 50 without deformation of the hooks 301, this embodiment provides at least two interference overlap areas at different positions. This prevents relative translation between the bracket 50 and the end cap 30 in the radial direction of the locking hole 508, thus preventing the first locking surface 302 and the second locking surface 509 from releasing their interference overlap area. Because the side portions of at least two hooks 301 respectively contact the hole wall of the locking hole 508, relative movement is prevented.

[0197] In this embodiment, multiple hooks 301 can be set to pass through the annular surface simultaneously, and in the radial direction of the locking hole 508, multiple first locking surfaces 302 are locked with the second locking surface 509. When it is necessary to separate the bracket 50 and the end cap 30, the hooks 301 can be moved to eliminate the interference overlap area, and then they can be disassembled.

[0198] In some embodiments, such as Figure 10 The bracket 50 is also provided with a guide hole 510, which is used to guide the hook 301 to engage with the hole 508, and the hole wall of the guide hole 510 is used to squeeze the hook 301 when it moves axially along the hole 508 so as to reduce the gap between adjacent hooks 301.

[0199] This embodiment also provides a guide hole 510. Since the hook 301 needs to be inserted into the hole 508, the guide hole 510 ensures that the hook 301 can smoothly enter the hole 508 during insertion. When the hole 508 is a stepped hole, it is inverted, and the guide hole 510 aligns with the smaller hole of the stepped hole. The guide hole 510 can be an inverted frustum hole, with the smaller hole aligning with the smaller hole. During insertion, the wall of the guide hole 510 contacts the hook 301, reducing the gap between adjacent hooks 301. This allows the hook 301 to deform during insertion, thus entering the hole 508.

[0200] The advantage of this embodiment is that it simplifies the insertion process, making the insertion accurate and convenient.

[0201] In some embodiments, such as Figure 6 The bracket 50 is also provided with a second through hole 504, which is used to connect the space on the side where the end cap 30 of the bracket 50 is located and the space on the side where the electrode assembly 40 is located.

[0202] Specifically, the second through hole 504 is opened on the bracket 50 and passes through the bracket 50, connecting the upper and lower spaces of the bracket 50. The lower space of the bracket 50 is the space where the electrode assembly 40 is located, and the upper space is the space below the end cap 30.

[0203] The effect of this embodiment is that the setting of the second through hole 504 further ensures the interconnection of various spaces inside the housing 20, especially the upper and lower spaces of the support 50, so that the air pressure is balanced in various places inside the housing 20, and it is also conducive to the flow of electrolyte.

[0204] For example, the second through hole 504 can be smaller than the first through hole 503. It can be a plurality of circular holes provided on the side of the bracket 50, which can achieve the effect of communication.

[0205] In some embodiments, the electrode assembly 40 includes a positive electrode and a negative electrode stacked together, with a positive electrode tab 401 disposed on the positive electrode and a negative electrode tab 402 disposed on the negative electrode.

[0206] In related technologies, the positive and negative electrode plates of the electrode assembly 40 can be in a wound form or in a stacked form.

[0207] The tabs of the stacked positive and negative electrodes are relatively neat, and their positions are easy to control, resulting in smaller misalignment errors and a smaller overall space occupied by the tabs. In contrast, the tabs of the wound positive and negative electrodes are more prone to misalignment and are harder to control, thus occupying a larger overall space. Since the tabs of the positive and negative electrodes in this embodiment are located on the same side, the tabs themselves occupy a larger space. Furthermore, a support 50 is provided to position the tabs, which pass through the support 50. Therefore, the stacked arrangement with neat tabs and small misalignment errors is very suitable for the battery cell 10 in this embodiment.

[0208] The advantage of this embodiment is that it adopts a stacked arrangement of positive and negative electrode plates that is more suitable for the same-side electrode arrangement, which makes the electrode plates occupy less space and makes it easier for the bracket 50 to shape and position the electrode plates.

[0209] In some embodiments, such as Figure 3 The shell 20 is rectangular and includes a first side 201, a second side 202 and a third side 203. The length of the second side 202 is less than the length of the first side 201 and greater than the length of the third side 203. The shell 20 has an opening, and the second side 202 and the third side 203 are located at the opening. The end cap 30 covers the opening.

[0210] Specifically, this embodiment provides a structural form of housing 20. The rectangular housing 20 is more suitable for the stacked electrode design. The end cap 30 is located at the opening formed by the two shorter sides. This simplifies the structural dimensions of the bracket 50 and the end cap 30, making it easier to assemble and reducing the drawbacks of unreasonable structural assembly.

[0211] In some embodiments, please refer to Figure 3, the length of the first side 201 is within the range of 200 mm to 400 mm, and / or, the length of the second side 202 is within the range of 90 mm to 150 mm, and / or, the length of the third side 203 is within the range of 20 mm to 50 mm.

[0212] Define the length of the first side 201 as L, the length of the second side 202 as W, and the length of the third side 203 as T, where 200 mm < L < 400 mm and / or 90 mm < W < 150 mm and / or 20 mm < T < 50 mm.

[0213] Such as Figure 3 , the length of the first side 201 of the housing 20 is L, the length of the third side 203 of the housing 20 is T, the length of the second side 202 of the housing 20 is W, and the length of the second side 202 is less than the length of the first side 201 and greater than the length of the third side 203, where 200 mm < L < 400 mm and / or 90 mm < W < 150 mm and / or 20 mm < T < 50 mm.

[0214] This embodiment provides the specific structural design dimensions of the housing 20, that is, the specific structural form of the battery cell 10 adopting the scheme where the electrode terminals are located on the same side. The housing 20 is the housing 20 of the battery cell 10, which has an electrode assembly 40, a bracket 50 inside, and an end cap 30 is provided.

[0215] The housing 20 of this embodiment adopts a cube shape, which is adapted to the arrangement of the laminated electrodes. The cross-section of the housing 20 is rectangular, and the housing 20 may specifically be in the shape of a cuboid.

[0216] First, define the length of the first side 201 as L, then the value range of L is 200 mm < L < 400 mm. Because if the length is smaller and lower than this range, it will have no advantage in improving the energy density and will reduce the energy seal. Moreover, if the length is too long, it will have a negative impact on the fast charging operation and safety assurance. Therefore, in this embodiment, the value range of L is selected as 200 mm < L < 400 mm, which is neither too long nor too short.

[0217] Furthermore, define the length of the second side 202 as W, then the value range of W is 90 mm < W < 150 mm. In this embodiment, the end cap 30 is arranged at the end formed by the second side 202 and the third side 203, that is, the tab is arranged in the area surrounded by the second side 202 and the third side 203, and the width direction of the tab is parallel to the direction of the second side 202, and the stacking arrangement direction of the tabs is parallel to the direction of the third side 203. Therefore, the setting of the tabs depends to a certain extent on the lengths of the second side 202 and the third side 203. Based on this, the value range of W provided in this embodiment, if it is lower than this range, it will limit the width of the tab, resulting in insufficient overcurrent capacity, and if it is higher than this range, there is no application scenario and it is unnecessary.

[0218] Furthermore, the length of the third side 203 is defined as T, and the value range of T is 20 mm < T < 50 mm. Since the stacking arrangement direction of the tabs is parallel to the third side 203, the length of the third side 203 affects the number of stacked layers and the thickness. This embodiment provides a value range of 20 mm < T < 50 mm. If it is higher than this range, the number of tab layers will increase excessively, increasing the bending structure of the tabs and making the welding difficult. If it is lower than this range, the number of tab layers will be too few, affecting the current-carrying capacity.

[0219] Therefore, the effect of this embodiment is that for the battery cell 10 with the positive and negative tabs on the same side, it provides appropriate dimensions for the housing 20, ensuring the stability and reliability of the structure and the current-carrying capacity of the tabs.

[0220] In some embodiments, the length of the first side 201 is within the range of 250 to 320, and / or the length of the second side 202 is within the range of 100 mm to 120 mm. That is, 250 mm < L < 320 mm and / or 100 mm < W < 120 mm.

[0221] This embodiment provides a further dimension range, that is, the length L of the first side 201 of the housing 20 is 250 mm < L < 320 mm, and the length W of the second side 202 is 100 mm < W < 120 mm. Within this range, the first side 201 and the second side 202 can better ensure the stability of the structure and the reliability of the function.

[0222] In some embodiments, as Figure 6 shown, the length L1 of the side of the bracket 50 parallel to the second side 202 satisfies 90% * W < L1 < (W - 2 mm) with the length W of the second side 202;

[0223] and / or the length T1 of the side of the bracket 50 parallel to the third side 203 satisfies 80% * T < T1 < (T - 2 mm) with the length T of the third side 203.

[0224] Specifically, this embodiment provides a bracket 50. The bracket 50 is arranged between the end cap 30 and the electrode assembly 40 and plays a role in supporting the tabs. Since the dimensions of the second side 202 and the third side 203 of the housing 20 are set, the dimensions of the bracket 50 need to be correspondingly set, neither too long nor too short. Because the bracket 50 is arranged on the opposite side of the end cap 30, that is, the bracket 50 is arranged in the area enclosed by the second side 202 and the third side 203 of the housing 20, so the dimensions of the bracket 50 need to be set by referring to the dimensions of the second side 202 and the third side 203.

[0225] The bracket 50 can be configured as a rectangular frame or a similar rectangular frame structure, with sides in two directions. In order to achieve a size fit and a stable installation effect, this embodiment provides a size range for the sides of the bracket 50.

[0226] The advantage of this embodiment is that the maximum length of the two sides of the support 50 is set to be 2mm smaller than the lengths of the second side 202 and the third side 203 of the housing 20, respectively. This allows the support 50 to be accommodated within the housing 20. In some cases, it also allows a gap to be formed between the peripheral wall of the support 50 and the inner wall of the housing 20, which facilitates the injection of electrolyte and maintains pressure balance throughout the housing 20. Setting the minimum length of the two sides of the support 50 to be greater than 90% and 80% of the lengths of the second side 202 and the third side 203 of the housing 20, respectively, allows for a redundancy (gaps) between the peripheral wall of the support 50 and the inner wall of the housing 20, without making the gaps too wide, thus maintaining the stability of the support 50.

[0227] like Figure 2 This application also provides an embodiment of a battery device 100, including a battery cell 10 provided in any of the embodiments.

[0228] This application also provides an electrical device having the battery device 100 provided in the above embodiments, that is, an electrical device that uses the battery device 100 as a power source.

[0229] The battery device 100 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 10, which are connected in series, parallel, or mixed connection via a busbar. Mixed connection refers to a combination of series and parallel connections.

[0230] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 10.

[0231] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 10 together to form an independent module. As an example, a battery module can be formed by bundling multiple battery cells 10 together with cable ties.

[0232] In some embodiments, the battery device 100 may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0233] 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.

[0234] As an example, the battery cell assembly can also be housed in the housing by directly fixing multiple battery cells 10 to the housing.

[0235] 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 an end cap or a base plate.

[0236] As an example, the enclosure may include end caps, a frame, and a base plate. The end caps and base plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0237] In some embodiments, the housing may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing may be at least a portion of the floor of the vehicle 1000, or a portion of the housing may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0238] like Figure 1 This application also provides an electrical device, including the battery device 100 provided in any of the above embodiments.

[0239] The technical solutions described in this application are applicable to various electrical devices using battery device 100, including vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the above-mentioned electrical devices.

[0240] The battery device 100 disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. Electrical devices can use power systems equipped with the battery device 100 disclosed in this application, which helps improve the reliability of the electrical devices.

[0241] For ease of explanation, the following embodiments will use a vehicle 1000 as an example of the electrical device provided in this application.

[0242] 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. 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.

[0243] 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.

[0244] 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 internal cavity; An end cap is provided with a positive electrode terminal and a negative electrode terminal, and the end cap is used to seal the housing; An electrode assembly, disposed within the housing, includes a positive electrode tab and a negative electrode tab, both located on the side of the electrode assembly facing the end cap. The positive electrode tab is connected to the positive electrode terminal, and the negative electrode tab is connected to the negative electrode terminal. A support is disposed between the end cap and the electrode assembly. The positive electrode tab and the negative electrode tab pass through the support. The support includes a partition, which is at least partially disposed between the positive electrode tab and the negative electrode tab in the direction from the positive electrode tab to the negative electrode tab. A connecting hole is provided on the partition.

2. The battery cell as described in claim 1, characterized in that, The battery cell also includes a bottom cover, which is located on the side of the housing opposite to the end cover, and the side of the bottom cover facing the electrode assembly has a support structure.

3. The battery cell as described in claim 2, characterized in that, The supporting structure includes plastic.

4. The battery cell as described in claim 2 or 3, characterized in that, The inner cavity is also provided with a side plate, which is located between the electrode assembly and the inner wall of the housing.

5. The battery cell as described in claim 4, characterized in that, The side plate is connected to the supporting structure.

6. The battery cell according to any one of claims 1-3 and 5, characterized in that, The bracket is provided with a first through hole, and the positive electrode tab and the negative electrode tab pass through the first through hole.

7. The battery cell as described in claim 6, characterized in that, The first through hole has at least two, and the positive electrode tab and the negative electrode tab are respectively inserted through different first through holes. The partition is disposed between the two first through holes through which the positive electrode tab and the negative electrode tab are respectively inserted.

8. The battery cell as described in claim 6, characterized in that, The bracket includes a first through hole, the partition is disposed in the first through hole, and the positive electrode tab and the negative electrode tab pass through the first through hole and are respectively located on opposite sides of the partition.

9. The battery cell as described in claim 7 or 8, characterized in that, The thickness of the separator is 0.6mm to 10mm along the direction from the positive electrode tab to the negative electrode tab.

10. The battery cell according to any one of claims 1-3, 5, 7, and 8, characterized in that, The end cap is provided with a liquid injection hole.

11. The battery cell as described in claim 10, characterized in that, The injection hole is positioned opposite to the partition plate.

12. The battery cell as described in claim 11, characterized in that, The end cap is also provided with an injection structure corresponding to the injection hole, and the partition is provided with an avoidance notch. The avoidance notch is set directly opposite the injection structure and is adapted to accommodate the injection structure.

13. The battery cell as described in claim 10, characterized in that, The injection hole is positioned opposite to the bottom wall of the support.

14. The battery cell as described in claim 12, characterized in that, The length of the clearance notch is 0.5mm to 2mm, and it is perpendicular to both the direction in which the liquid injection structure is inserted into the clearance notch and the direction in which the positive electrode tab points to the negative electrode tab.

15. The battery cell according to any one of claims 1-3, 5, 7, 8, 11-14, characterized in that, The peripheral wall of the bracket is spaced apart from the inner wall of the housing, and a connecting opening is provided on the peripheral wall of the bracket, which connects the space between the peripheral wall of the bracket and the inner wall of the housing.

16. The battery cell as described in claim 15, characterized in that, Along the direction from the positive electrode to the negative electrode, at least one communication port is provided on each of the opposite sides of the peripheral wall of the support.

17. The battery cell as described in claim 16, characterized in that, The opening area of ​​a single connection port on the first plane is S, which satisfies S=C*K / 2, where the first plane is a plane perpendicular to the direction from the positive tab to the negative tab, C is the energy storage capacity of the battery cell, and 0≤K≤1.

18. The battery cell according to any one of claims 1-3, 5, 7, 8, 11-14, 16, and 17, characterized in that, The bracket is detachably connected to the end cap.

19. The battery cell as described in claim 18, characterized in that, The end cap is provided with a hook, and the bracket is provided with a locking hole. The hook and the locking hole are adapted to engage so that the end cap is connected to the bracket.

20. The battery cell as described in claim 19, characterized in that, The hook has a first locking surface, and the hole wall of the card hole has a second locking surface. Along the axial direction of the card hole, the hook can be adapted to be inserted into the card hole so that the first locking surface is located below the second locking surface and is used to abut against the second locking surface.

21. The battery cell as described in claim 20, characterized in that, The second locking surface is an annular surface, and there is an interfering overlapping area between the first locking surface and the second locking surface; along the axial direction of the locking hole, a gap is formed between the first locking surface and the second locking surface.

22. The battery cell as described in claim 21, characterized in that, Along the radial direction of the card hole, the length of the interference overlap region is 0.3mm~0.4mm, and along the axial direction of the card hole, the height of the gap is 0.05mm~0.5mm.

23. The battery cell according to any one of claims 20-22, characterized in that, The card hole is a stepped hole, and the second card position surface is the stepped surface of the card hole.

24. The battery cell according to any one of claims 20-22, characterized in that, Multiple hooks are spaced apart on the end cap along the circumference of the card hole. There is a gap between adjacent hooks. The hooks are elastic. Multiple hooks are used to simultaneously engage with the card hole. During the engagement process, the gap between adjacent hooks is reduced by compression and after insertion, the gap between adjacent hooks returns to the state before engagement.

25. The battery cell as described in claim 24, characterized in that, The bracket is also provided with a guide hole, which is used to guide the hook to engage with the hole, and the wall of the guide hole is used to squeeze the hook when the hook moves along the axial direction of the hole to reduce the gap between adjacent hooks.

26. The battery cell according to any one of claims 1-3, 5, 7, 8, 11-14, 16, 17, 19-22, 25, characterized in that, The bracket is also provided with a second through hole, which is used to connect the space on the side where the end cap of the bracket is located and the space on the side where the electrode assembly is located.

27. The battery cell according to any one of claims 1-3, 5, 7, 8, 11-14, 16, 17, 19-22, 25, characterized in that, The electrode assembly includes a positive electrode and a negative electrode stacked together, with the positive electrode tab disposed on the positive electrode and the negative electrode tab disposed on the negative electrode.

28. The battery cell according to any one of claims 1-3, 5, 7, 8, 11-14, 16, 17, 19-22, 25, characterized in that, The housing is rectangular in shape and includes a first side, a second side, and a third side; the length of the second side is less than the length of the first side and greater than the length of the third side; the housing has an opening, the second side and the third side are located at the opening, and the end cap covers the opening.

29. The battery cell as described in claim 28, characterized in that, The length of the first side is in the range of 200mm to 400mm, and / or the length of the second side is in the range of 90mm to 150mm, and / or the length of the third side is in the range of 20mm to 50mm.

30. The battery cell as described in claim 28, characterized in that, The length of the first side is in the range of 250 to 320 mm, and / or the length of the second side is in the range of 100 mm to 120 mm.

31. The battery cell as described in claim 28, characterized in that, The length L1 of the side of the bracket parallel to the second side satisfies 90%*W<L1<(W-2mm) with the length W of the second side. And / or, the length T1 of the side of the bracket parallel to the third side satisfies 80%*T<T1<(T-2mm).

32. A battery device, characterized in that, Includes the battery cell described in any one of claims 1-31.

33. An electrical device, characterized in that, Includes the battery device as described in claim 32.

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