CN219497944U

CN219497944U - Top cover components, battery cells, battery modules, battery packs and electrical devices

Info

Publication number: CN219497944U
Application number: CN202223375086.5U
Authority: CN
Inventors: 张奕炜; 赵艺惠; 张方超
Original assignee: Shanghai Lanjun New Energy Technology Co Ltd
Current assignee: Shanghai Lanjun New Energy Technology Co Ltd
Priority date: 2022-12-14
Filing date: 2022-12-14
Publication date: 2023-08-08
Anticipated expiration: 2032-12-14

Abstract

The utility model relates to a top cover assembly, which comprises a cover plate and an insulating plate stacked with the cover plate. When assembling the battery cell, the top cover assembly is used to seal the battery cell assembly in the housing, and the battery cell assembly is limited and supported by making the limit protrusion on the insulating plate resist the battery cell assembly, thereby Prevent the cell assembly from moving up and down in the housing. Since the protruding part on the cover plate is accommodated in the accommodating groove, the supporting effect of the position-limiting protrusion can be improved. Even if the insulating plate is softened or melted due to high temperature, the limit protrusion can still support the cell assembly or the cell assembly can be directly supported by the protrusion, so as to effectively prevent the cell assembly from being damaged due to reciprocating movement And avoid the tabs from being torn. Therefore, the above-described top cover assembly can improve the reliability of the secondary battery. In addition, the utility model also provides a battery cell, a battery module, a battery pack and an electrical device.

Description

Top cap subassembly, battery cell, battery module, battery package and power consumption device

Technical Field

The utility model relates to the technical field of new energy, in particular to a top cover assembly, a battery cell, a battery module, a battery pack and an electric device.

Background

Secondary batteries generally include a case, a battery cell assembly, and a top cap assembly, the battery cell assembly being received in the case and sealed by the top cap assembly. The existing top cover assembly comprises a cover plate and lower plastic, wherein the lower plastic is arranged between the cover plate and the battery cell assembly, and can limit the battery cell assembly from moving up and down. However, the lower plastic has a low melting point, and is easily melted or softened when the temperature inside the secondary battery increases, thereby causing failure of the limit support of the cell assembly. When the limiting support of the lower plastic fails, vibration or extrusion between the secondary batteries can easily cause the battery core assembly to reciprocate in the shell, so that damage to the battery core assembly or tearing of the tab can be caused, and the reliability of the secondary batteries is reduced.

Disclosure of Invention

In view of the above, it is necessary to provide a top cap assembly capable of improving the reliability of a secondary battery.

The utility model provides a top cover assembly, which comprises a cover plate and an insulating plate, wherein the insulating plate is laminated with the cover plate, a protruding part is formed on one side of the cover plate, which faces towards the insulating plate, the position, corresponding to the protruding part, of the insulating plate is recessed towards the direction opposite to the cover plate, so that a containing groove is formed on one side of the insulating plate, which faces towards the cover plate, and a limit protrusion is formed on one side of the insulating plate, which faces away from the cover plate, and the protruding part is contained in the containing groove.

In one embodiment, a plurality of the protruding portions are provided, and the protruding portions are provided at intervals along the longitudinal direction of the cover plate.

In one embodiment, the protruding portion is elongated, and a longitudinal direction of the protruding portion is not parallel to a longitudinal direction of the cover plate.

In one embodiment, the lengthwise direction of the protrusion is perpendicular to the lengthwise direction of the cover plate.

In one embodiment, the length of the protrusion is one half to four fifths of the width of the cover plate.

In one embodiment, the distance between both ends in the length direction of the protruding portion and both side edges in the width direction of the cover plate is 2mm to 30mm.

In one embodiment, each of the protruding portions includes at least two protruding structures arranged in a width direction of the cover plate.

In one embodiment, the height of the limit projection with respect to the insulating plate in the thickness direction of the insulating plate is 1mm to 10mm.

In one embodiment, the protruding part forms a first contact plane towards the accommodating groove, and a second contact plane is formed on the side of the limiting protrusion, which faces away from the accommodating groove.

In one embodiment, at least part of the cap plate is recessed toward the insulating plate to form the protrusion on a side of the cap plate facing toward the insulating plate and a groove on a side of the cap plate facing away from the insulating plate.

In one embodiment, the width of the protrusion decreases in a direction from the cap plate toward the insulating plate.

In one embodiment, the cross-sectional shape of the protruding portion is a trapezoid having one end opened in a plane perpendicular to the longitudinal direction of the protruding portion.

In one embodiment, a connection boss is formed on a side of the insulating plate facing away from the cover plate, and the height of the connection boss in the thickness direction of the insulating plate relative to the insulating plate is smaller than the height of the limit protrusion in the thickness direction of the insulating plate relative to the insulating plate.

In one embodiment, the connection boss includes first bosses distributed at both ends of the insulation board in a length direction, and the first bosses are elongated and extend along a width direction of the insulation board.

In one embodiment, the connecting boss further includes two second bosses distributed in the middle of the insulating plate, and the two second bosses are respectively disposed at two edges of the insulating plate in the width direction.

In one embodiment, the cover plate is provided with a liquid injection hole penetrating in the thickness direction, at least two protruding parts are arranged on the protruding parts, and the at least two protruding parts are distributed on two sides of the liquid injection hole.

In one embodiment, the cover plate is provided with explosion-proof holes penetrating in the thickness direction, the protruding parts are provided with at least two protruding parts, the at least two protruding parts are distributed on two sides of the explosion-proof holes, and the top cover assembly further comprises explosion-proof valves, and the explosion-proof valves are arranged in the explosion-proof holes in a sealing mode.

Above-mentioned top cap subassembly is used for sealing the electric core subassembly in the casing when assembling the battery monomer to through making spacing protruding on the insulation board support with electric core subassembly, with spacing support to electric core subassembly, thereby prevent electric core subassembly drunkenness about in the casing. The protruding part on the cover plate is accommodated in the accommodating groove, so that the supporting effect of the limiting protrusion is better. Even the insulation board softens or melts because of the high temperature, spacing protruding also can keep supporting or directly support the electric core subassembly by the protruding portion to can avoid the electric core subassembly to take place to damage and avoid the utmost point ear to be torn because of reciprocating the drunkenness effectively. Therefore, the above-described top cap assembly can improve the reliability of the secondary battery.

In addition, the utility model also provides a battery cell, a battery module, a battery pack and an electric device.

A battery cell comprising:

a housing having an opening formed at one side thereof;

the battery cell assembly is accommodated in the shell; and

The cap assembly of any one of the above preferred embodiments, wherein the cap assembly is sealingly disposed in the opening.

A battery module comprises a module management system and a plurality of battery cells according to the preferred embodiment, wherein a plurality of battery cells are connected in series and/or in parallel.

A battery pack comprises a battery management system and a plurality of battery cells according to the preferred embodiment or a plurality of battery modules according to the preferred embodiment, wherein a plurality of battery cells or a plurality of battery modules are connected in series and/or in parallel.

An electrical device comprising a battery pack as described in the preferred embodiment above.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded view of a battery cell according to a preferred embodiment of the present utility model;

FIG. 2 is a top view of the battery cell shown in FIG. 1;

FIG. 3 is a cross-sectional view of the battery cell shown in FIG. 2 taken along line A-A;

fig. 4 is a cross-sectional view of a cap assembly in the battery cell shown in fig. 3;

FIG. 5 is an exploded view of the cap assembly of FIG. 4;

fig. 6 is a bottom view of the insulating plate of the header assembly of fig. 5.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

The utility model discloses an electric device, a battery pack and a battery module. The electric device can be a vehicle, a mobile phone, portable equipment, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, energy storage equipment, recreation equipment, an elevator, lifting equipment and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, or an electric plane toy, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and the like; the energy storage device can be an energy storage wall, a base station energy storage, a container energy storage and the like; the amusement device may be a carousel, a stair jump machine, or the like. The present application does not particularly limit the above-described power consumption device. For pure electric vehicles, the battery pack can be used as a driving power supply to replace fossil fuel to provide driving power.

Referring to fig. 1, the present utility model further provides a battery cell 10 and a top cap assembly 300. The battery pack includes a Battery Management System (BMS) and a plurality of battery cells 10.

The plurality of battery cells 10 can be electrically connected in series, parallel or a combination of series and parallel, and are in communication connection with a battery management system to form the battery pack, and the battery management system controls and monitors the working state of each battery cell 10. In addition, the plurality of battery cells 10 may be connected in series and/or in parallel, and form a battery module with a module management system, and then the plurality of battery modules are electrically connected in series, in parallel or in a mixed manner of series and parallel, and together form the battery pack with the battery management system.

In the battery pack or the battery module, the plurality of battery cells 10 may be mounted on a supporting structure such as a case, a frame, a bracket, etc., and the battery cells 10 may be electrically connected to each other, and the battery cells 10 and the battery management system or the module management system may be electrically connected to each other through a bus member. The battery cell 10 may be a lithium ion battery, a sodium ion battery or a magnesium ion battery, and its outer contour may be cylindrical, square or other shapes, but is not limited thereto. In particular, in the present embodiment, the battery cell 10 is a lithium ion prismatic battery.

Referring to fig. 2 and 3, the battery cell 10 according to the preferred embodiment of the utility model includes a housing 100, a cell assembly 200 and a cap assembly 300.

The housing 100 is used for accommodating the battery cell assembly 200, the electrolyte and other components, and is generally formed of materials such as aluminum, aluminum alloy and stainless steel, and has high mechanical strength. An opening (not shown) is formed at one side of the case 100, through which the cell assembly 200 can be mounted in the case 100. In particular, in the present embodiment, the outer contour of the housing 100 is square.

The cell assembly 200 is a core component of the battery cell 10. To adapt to the shape of the housing 100, the cell assembly 200 in this embodiment is flat. Specifically, the cell assemblies 200 generally include a bare cell 210 and an insulating sheet 220, and each cell assembly 200 may include one or more bare cells 210. The bare cell 210 may be formed of a positive electrode sheet, a negative electrode sheet, and a separator having an insulating function between the negative electrode sheet and the positive electrode sheet by winding or lamination, and the bare cell 210 formed by winding may be pressed into a flat shape. The insulating sheet 220 is coated on the outer periphery of the bare cell 210, and exposes the tab of the bare cell 210. The insulating sheet 220 may be polyimide, polyethylene, polyvinylidene fluoride, or the like, and can protect the bare cell 210 and perform a good insulating function between the bare cell 210 and the inner wall of the case 100.

The cap assembly 300 is hermetically disposed at the opening of the case 100 to form a relatively closed environment inside the case 100, thereby isolating the cell assembly 200 from the external environment. The shape of the top cover assembly 300 is adapted to the shape of the opening of the housing 100, and in this embodiment, the top cover assembly 300 is substantially rectangular.

Referring to fig. 4 and 5, the top cover assembly 300 according to the preferred embodiment of the present utility model includes a cover plate 310 and an insulating plate 320. Wherein the cap plate 310 and the insulating plate 320 are stacked.

The cap plate 310 may be formed of a material having high mechanical strength, such as aluminum, aluminum alloy, or stainless steel, and the insulating plate 320 may be formed of an insulating material such as plastic, rubber, or the like. The cap plate 310 and the insulating plate 320 may have substantially the same shape, and each may have a rectangular shape. The cover plate 310 and the insulating plate 320 are generally connected by means of clamping, adhesion, or the like. In addition, the cover plate 310 and the insulating plate 320 may be integrally formed by injection molding.

In particular, in the present embodiment, the cover plate 310 is provided with a liquid injection hole 313 penetrating in the thickness direction. Correspondingly, through holes (not shown) are also formed in positions of the insulating plate 320 corresponding to the liquid injection holes 313, and the liquid injection holes 313 and the through holes are generally circular holes. After the cap assembly 300 seals the opening of the case 100, an electrolyte may be injected into the inside of the case 100 through the injection hole 313. After the injection is completed, the injection hole 313 is also typically plugged by laser welding.

In addition, the top cover assembly 300 further includes a pole assembly 330, and mounting holes (not shown) for mounting the pole assembly 330 are formed in the cover plate 310 and the insulating plate 320. The pole assembly 330 includes a pole 331, a rubber ring 332, a pressing ring 333 and a sealing ring 334. The post assembly 330 is provided with two terminals serving as the positive electrode terminal and the negative electrode terminal of the battery cell 10, respectively. The pole 331 is disposed in the mounting hole in a penetrating manner, and one end of the pole extends into the housing 100 to be electrically connected with the tab of the battery cell assembly 200. The pressing ring 333 presses the pole 331 to the edge of the mounting hole, and the upper and lower sides of the pole 331 and the cover 310 are respectively insulated and sealed by the upper rubber ring 332 and the sealing ring 334.

When the top cover assembly 300 is sealed and arranged at the opening of the shell 100, the insulating plate 320 is arranged towards the inside of the shell 100, and the insulating plate 320 can be abutted with the battery cell assembly 200 in the shell 100, so that limit support is provided for the battery cell assembly 200, and the battery cell assembly 200 is prevented from moving up and down in the shell 100.

Further, the cap plate 310 is formed with a protrusion 311 on a side facing the insulating plate 320. The protruding portion 311 protrudes toward the insulating plate 320, i.e., downward as shown in fig. 4, compared to the surface of the cap plate 310, and the protruding portion 311 may have a long strip shape, a column shape, or other irregular shape.

The protruding portion 311 is generally formed integrally with the cover plate 310. In particular, in the present embodiment, at least a portion of the cap plate 310 is recessed toward the insulating plate 320 to form a protrusion 311 on a side of the cap plate 310 toward the insulating plate 320 and a groove 312 on a side of the cap plate 310 facing away from the insulating plate 320.

Therefore, when the cover plate 310 is processed, the integrally formed protruding portion 311 can be formed by punching the flat plate-shaped plate blank, so that the forming is more convenient and the production cost is lower. Moreover, after the cover plate 310 is bent by stamping, the structural strength of the cover plate 310 can be improved compared with a flat plate structure, so that the deformation of the top cover assembly 300 caused by the increase of the pressure in the casing 100 is effectively avoided, and the safety and reliability of the battery cell 10 are improved.

It should be noted that, in other embodiments, ribs may be formed on the surface of the cap plate 310 facing the insulating plate 320 by machining, and may be used as the protruding portion 311.

The position of the insulating plate 320 corresponding to the protruding portion 311 is recessed toward the direction facing away from the cap plate 310, so that a receiving groove 321 is formed at a side of the insulating plate 320 facing toward the cap plate 310, and a limit protrusion 322 is formed at a side of the insulating plate 320 facing away from the cap plate 310. The protruding portion 311 is accommodated in the accommodation groove 321.

The outline of the accommodating groove 321 and the limiting protrusion 322 is substantially the same as the outline of the protruding portion 311, and the protruding portion 311 may abut against the inner wall of the accommodating groove 321, or may form a small gap with the inner wall of the accommodating groove 321. Preferably, in the present embodiment, the protruding portion 311 abuts against the inner wall of the accommodating groove 321. It can be seen that the protruding portion 311 can line the limit protrusion 322, thereby strengthening the supporting strength of the limit protrusion 322. When the top cover assembly 300 is sealed and disposed at the opening of the housing 100, the limiting protrusion 322 abuts against the battery cell assembly 200, so as to limit and support the battery cell assembly 200. Since the protruding portion 311 of the cover 310 is accommodated in the accommodating groove 321, the supporting effect of the limiting protrusion 322 can be better.

When the temperature in the case 100 increases, causing the insulating plate 320 to soften or melt, the limit protrusions 322 can maintain the support of the cell assembly 200 under the support of the protrusions 311. Moreover, even if the region where the limit projection 322 is located is completely melted, the cell assembly 200 can be directly supported by the protruding portion 311. Therefore, the battery cell assembly 200 can be well limited in the housing 100 all the time, so that the reciprocating movement of the battery cell assembly 200 can be effectively avoided, the damage to the battery cell assembly 200 is prevented, and the tearing of the tab due to excessive pulling is avoided.

In particular, in the present embodiment, a plurality of protruding portions 311 are provided, and the plurality of protruding portions 311 are provided at intervals along the longitudinal direction of the cover plate 310. The number of the protruding portions 311 is equal to the number of the limit protrusions 322, for example, two. The plurality of protruding parts 311 and the limiting protrusions 322 are matched with each other, so that the cell assembly 200 can be supported at multiple points, and more reliable limiting is provided for the cell assembly 200.

In addition, at least one protruding portion 311 is respectively distributed on two sides of the liquid injection hole 313, and protruding portions 331 distributed on two sides of the liquid injection hole 313 can effectively overhead the liquid injection hole 313, so that the liquid injection hole 313 is prevented from being blocked by the battery cell assembly 200 moving upwards.

In particular, in the present embodiment, the protruding portion 311 is elongated, and the longitudinal direction of the protruding portion 311 is not parallel to the longitudinal direction of the cover 310. That is, the protruding portion 311 may be provided at an angle to the longitudinal direction of the cover plate 310. Correspondingly, the limiting protrusion 322 is also substantially elongated and is not parallel to the longitudinal direction of the insulating plate 320. Therefore, when the limiting protrusion 322 is abutted against the battery cell assembly 200, the pole piece is prevented from being separated or damaged due to the fact that the extending directions of the limiting protrusion 322 and the pole piece in the bare cell 210 are consistent, and accordingly safety and reliability of the battery cell 10 are guaranteed.

More preferably, in the present embodiment, the lengthwise direction of the protruding portion 311 is perpendicular to the lengthwise direction of the cover plate 310. That is, the protruding portion 311 and the limiting protrusion 322 extend along the width direction of the cover 310, so the limiting and supporting effect on the cell assembly 200 is optimal.

It should be noted that, in other embodiments, the protruding portion 311 and the limiting protrusion 322 may have other shapes such as arc, S-shape, or X-shape.

In another embodiment, each of the protruding parts 311 includes at least two protruding structures (not shown) arranged in the width direction of the cover plate 310. That is, each of the protruding portions 311 is of a discontinuous structure. The protruding structures are dispersed, so that the cell assembly 200 can be supported together, and a good supporting effect can be provided. At this time, the shapes of the accommodating groove 321 and the limiting projection 322 may be a discontinuous structure in conformity with the shape of the protruding portion 311.

The individual protruding structures may be in the form of strips, discs or the like. The plurality of protruding structures of each protruding portion 311 may be aligned, offset, or partially overlapped in the width direction of the cover plate 310, i.e., the up-down direction shown in fig. 2. Preferably, in this embodiment, at least two protruding structures are spaced apart and aligned along the width direction of the cover plate 310. In this way, the processing of the protruding portion 311 is more convenient.

Referring to fig. 2 again, in the present embodiment, the length of the protruding portion 311 is one half to four fifths of the width of the cover plate 310. When the length of the protruding portion 311 is less than half of the width of the cover plate 310, the protruding portion 311 is too short to effectively support the cell assembly 200. And when the length of the protruding part 311 is more than four fifths of the width of the cap plate 310, the distance between both ends of the protruding part 311 and both side edges of the cap plate 310 in the width direction is too small, thereby causing inconvenience in assembly. The length of the protruding portion 311 is set to be one half to four fifths of the width of the cover plate 310, so that the reliability of support and the convenience of assembly can be well considered.

More specifically, in the present embodiment, the distance between both ends in the length direction of the protruding portion 311 and both side edges in the width direction of the cover plate 310 is 2mm to 30mm.

When the distances between the ends of the protruding portions 311 and the edges of the cover plate 310 are less than 2mm, the distances between the protruding portions 311 and the edges of both sides of the cover plate 310 in the width direction are too small, resulting in inconvenient assembly. When the distance between the end of the protruding portion 311 and the edge of the cover plate 310 is greater than 30mm, the protruding portion 311 is too short to effectively support the cell assembly 200. Therefore, the distance between the tail end of the protruding part 311 and the edge of the cover plate 310 is set between 2mm and 30mm, so that the reliability of support and the convenience of assembly can be better considered.

More specifically, in the present embodiment, the height of the limit projection 322 with respect to the insulating plate 320 in the thickness direction of the insulating plate 320 is 1mm to 10mm.

The height of the limiting protrusion 322 relative to the insulating plate 320 is H2 shown in fig. 4, and when the height H2 of the protruding portion 311 is less than 1mm, the protruding height of the limiting protrusion 322 is too small, so that the support and limitation of the cell assembly 200 are insufficient. When the height H2 of the protruding part 311 is greater than 10mm, the internal space of the case 100 is wasted, resulting in a decrease in the energy density of the battery cell 10. The height of the limiting protrusion 322 is set to be 1mm to 10mm, so that the requirements of effectiveness and miniaturization of support can be met well.

Referring to fig. 3 again, in the present embodiment, a first contact plane is formed on a side of the protruding portion 311 facing the accommodating groove 321, and a second contact plane is formed on a side of the limiting protrusion 322 facing away from the accommodating groove 321.

Specifically, the first contact plane and the second contact plane are located on the lower end surfaces of the protruding portion 311 and the limiting protrusion 322, respectively. When the limiting protrusion 322 abuts against the cell assembly 200, the second contact plane makes surface contact with the cell assembly 200. The surface contact can increase the contact area, so that the limiting protrusion 322 can better limit and support the cell assembly 200. Moreover, the larger contact area can disperse the pressure applied to the cell assembly 200 by the limiting protrusion 322, so that the damage to the pole piece in the bare cell 210 can be avoided, and the safety and reliability of the battery cell 10 can be further improved.

Preferably, the protruding portion 311 abuts against the bottom of the accommodating groove 321. The bottom of the accommodating groove 321 is also a plane, so the first contact plane can be well attached to the bottom of the accommodating groove 321, so that the protruding portion 311 can support the limiting protrusion 322 more reliably, and the limiting protrusion 322 can support the battery cell assembly 200 more reliably.

Referring again to fig. 4, in the present embodiment, the width of the protruding portion 311 decreases in the direction from the cap plate 310 toward the insulating plate 320. Taking fig. 4 as an example, the width of the protruding portion 311 decreases from top to bottom, and the protruding portion 311 has a structure with a wide top and a narrow bottom, and is not easy to deform when receiving pressure from bottom to top, so that the protruding portion 311 has better effect of limiting and supporting the limiting protrusion 322.

Further, in the present embodiment, the cross-sectional shape of the protruding portion 311 is a trapezoid with one end opened in a plane perpendicular to the longitudinal direction of the protruding portion 311.

The plane perpendicular to the longitudinal direction of the protruding portion 311 is the drawing plane shown in fig. 4. It should be noted that the cross-sectional shape of the protruding portion 311 is not strictly trapezoidal, and the protruding portion 311 may be transited to other regions of the cover plate 310 by an arc surface. In addition, in other embodiments, the cross-sectional shape of the protruding portion 311 may also be U-shaped or V-shaped.

Referring to fig. 6, in the present embodiment, a connection boss 323 is formed on a side of the insulating plate 320 facing away from the cover plate 310, and a height of the connection boss 323 in a thickness direction of the insulating plate 320 relative to the insulating plate 320 is smaller than a height of the limit protrusion 322 in the thickness direction of the insulating plate 320 relative to the insulating plate 320.

The connection boss 323 and the insulating plate 320 are generally integrally formed. The connection boss 323 is used for providing a connection position between the top cap assembly 300 and the insulating sheet 220 of the battery cell assembly 200, and specifically, two ends of the insulating sheet 220 can be respectively connected with the surface of the connection boss 323 by means of hot melting, so that the battery cell assembly 200 and the top cap assembly 300 are connected into a whole. In assembling the battery cell 10, the battery cell assembly 200 and the cap assembly 300 may be integrally connected, and then the battery cell assembly 200 may be mounted in the case 100 such that the cap assembly 300 seals the opening of the case 100.

As shown in fig. 4, the height of the connection boss 323 with respect to the insulating plate 320 means H1 and H3, i.e., H1 and H3 are smaller than H2. In this way, when the limiting protrusion 322 abuts against the cell assembly 220, the connection boss 323 is not in direct contact with the cell assembly 200. In this way, the battery cell assembly 200 is only in contact with the limiting protrusion 322, so that the problem that the pole piece of the bare cell 210 is subjected to powder dropping due to long-term supporting with the insulating plate 320, and further the self-discharge of the battery cell 10 is increased and even internal short circuit is avoided.

In the present embodiment, the connection boss 323 includes first bosses 3231 distributed at both ends in the length direction of the insulating plate 320, and the first bosses 3231 are elongated and extend in the width direction of the insulating plate 320. It can be seen that the first boss 3231 can provide a larger connection location, thereby facilitating connection of both ends of the insulating sheet 220 of the cell assembly 200 with the cap assembly 300. At least two first bosses 3231 are respectively disposed at two ends of the insulating plate 320 in the length direction. Obviously, the first boss 3231 may be provided with more than two.

Further, in the present embodiment, the connection boss 323 further includes two second bosses 3232 distributed in the middle of the insulating plate 320, and the two second bosses 3232 are respectively disposed at two edges of the insulating plate 320 in the width direction. The two second bosses 3232 can be connected with the middle of the insulating sheet 220, thereby improving the reliability of the connection of the battery cell assembly 200 with the cap assembly 300.

Note that H1 and H3 refer to the heights of the first boss 3231 and the second boss 3232, respectively. H1 and H3 may be equal or different, as long as the heights (H1 and H3) of the first boss 3231 and the second boss 3232 are smaller than the height (H2) of the limit protrusion 322.

In addition, in another embodiment, the cover plate 310 is provided with a explosion-proof hole penetrating in the thickness direction, and the top cap assembly 300 further includes an explosion-proof valve (not shown) sealingly disposed in the explosion-proof hole and between two adjacent protruding portions 311.

When the gas pressure in the case 100 exceeds a threshold value, the explosion-proof valve opens to release the pressure in the case 100, thereby preventing the explosion of the battery cell 10. The protrusions 311 distributed at both sides of the explosion-proof valve can effectively overhead the explosion-proof hole, thereby preventing the explosion-proof valve from being blocked by the upwardly moved cell assembly 200.

The top cover assembly 300 is used for sealing the battery cell assembly 200 in the housing 100 when the battery cell 10 is assembled, and the battery cell assembly 200 is supported in a limiting manner by the limiting protrusions 322 on the insulating plate 320 and the battery cell assembly 200, so as to prevent the battery cell assembly 200 from moving up and down in the housing 100. Since the protruding portion 311 of the cover 310 is accommodated in the accommodating groove 321, the supporting effect of the limiting protrusion 322 can be better. Even if the insulating plate 320 is softened or melted due to high temperature, the limiting protrusion 322 can keep supporting the battery cell assembly 200 or directly support the battery cell assembly 200 by the protruding portion 311, so that damage to the battery cell assembly 200 caused by reciprocating movement and tearing of the tab can be effectively avoided. Accordingly, the cap assembly 300 described above can improve the reliability of the battery cell 10.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. The utility model provides a top cap subassembly, includes the apron and with the insulation board of apron range upon range of setting, its characterized in that, the apron orientation one side of insulation board is formed with the protruding portion, the insulation board with the position that the protruding portion corresponds is towards the direction of apron is sunken, so that the insulation board orientation one side of apron forms the accommodation groove, and the insulation board is dorsad one side of apron forms spacing arch, the protruding portion accept in the accommodation groove.

2. The header assembly of claim 1, wherein a plurality of said protrusions are provided and a plurality of said protrusions are spaced apart along a longitudinal direction of said cover plate.

3. The header assembly of claim 1, wherein the protrusions are elongated and the longitudinal direction of the protrusions is non-parallel to the longitudinal direction of the cover plate.

4. The header assembly of claim 3, wherein the lengthwise direction of the projection is perpendicular to the lengthwise direction of the cover plate.

5. The header assembly of claim 3, wherein the length of the projection is one-half to four-fifths of the width of the cover plate.

6. The header assembly of claim 3, wherein the distance between both ends in the length direction of the protruding portion and both side edges in the width direction of the cover plate is 2mm to 30mm.

7. The header assembly of claim 1, wherein each of the protrusions includes at least two protrusion structures arranged in a width direction of the cover plate.

8. The header assembly according to claim 1, wherein the height of the limit projection with respect to the insulating plate in the thickness direction of the insulating plate is 1mm to 10mm.

9. The header assembly of claim 1, wherein the projection forms a first contact plane toward the receiving slot and the limit projection forms a second contact plane on a side facing away from the receiving slot.

10. The header assembly of any one of claims 1 to 9, wherein at least a portion of the cap plate is recessed toward the insulating plate to form the protrusion on a side of the cap plate facing the insulating plate and a recess on a side of the cap plate facing away from the insulating plate.

11. The header assembly of claim 10, wherein the width of the projection decreases in a direction from the cap toward the insulating plate.

12. The header assembly of claim 11, wherein the cross-sectional shape of the protruding portion is a trapezoid with one end open in a plane perpendicular to the lengthwise direction of the protruding portion.

13. The header assembly according to claim 1, wherein a side of the insulating plate facing away from the cap plate is formed with a connection boss, a height of the connection boss in a thickness direction of the insulating plate with respect to the insulating plate being smaller than a height of the limit projection in the thickness direction of the insulating plate with respect to the insulating plate.

14. The header assembly of claim 13, wherein the connection boss comprises first bosses distributed at both ends of the insulating plate in a length direction, the first bosses being elongated and extending in a width direction of the insulating plate.

15. The header assembly of claim 14, wherein the connection boss further comprises two second bosses distributed in the middle of the insulating plate, the two second bosses being respectively provided at both edges of the insulating plate in the width direction.

16. The cap assembly according to claim 1, wherein the cap plate is provided with a liquid injection hole penetrating in a thickness direction, the protruding portions are provided with at least two, and the at least two protruding portions are distributed on both sides of the liquid injection hole.

17. The cap assembly of claim 1, wherein the cap plate is provided with explosion-proof holes penetrating in a thickness direction, the protruding portions are provided with at least two protruding portions, and at least two protruding portions are distributed on both sides of the explosion-proof holes, and the cap assembly further comprises explosion-proof valves, and the explosion-proof valves are sealed to be arranged in the explosion-proof holes.

18. A battery cell, comprising:

a housing having an opening formed at one side thereof;

the battery cell assembly is accommodated in the shell; and

The cap assembly of any one of the above claims 1-17, wherein the cap assembly is sealingly disposed in the opening.

19. A battery module comprising a module management system and a plurality of cells according to claim 18, wherein a plurality of the cells are connected in series and/or parallel.

20. A battery pack comprising a battery management system and a plurality of battery cells according to claim 18 or a plurality of battery modules according to claim 19, wherein a plurality of said battery cells or said battery modules are connected in series and/or in parallel with each other.

21. An electrical device comprising a battery pack as claimed in claim 20.