CN220253344U

CN220253344U - Top cover assembly, battery cell, battery and electricity utilization device

Info

Publication number: CN220253344U
Application number: CN202321050658.4U
Authority: CN
Inventors: 张方超; 尹进
Original assignee: Lanjun New Energy Technology Co ltd
Current assignee: Lanjun New Energy Technology Co ltd
Priority date: 2023-04-27
Filing date: 2023-04-27
Publication date: 2023-12-26
Anticipated expiration: 2033-04-27

Abstract

The present utility model relates to a top cap assembly, comprising: the cover plate is provided with a mounting hole; the first insulating piece is arranged on the back surface of the cover plate; the pole is penetrated through the mounting hole, and the outer peripheral wall of the pole is provided with an accommodating hole; one end of the reinforcing rod extends into the accommodating hole, and the other end of the reinforcing rod extends out of the pole; the second insulating part is arranged on the front surface of the cover plate, the second insulating part is arranged between the mounting hole of the cover plate and the peripheral wall of the pole in an injection molding mode, the second insulating part wraps one end of the reinforcing rod extending out of the pole, and the strength of the reinforcing rod is larger than that of the second insulating part. When the pole receives pressure along its direction of height, can exert pressure to the stiffener, because the intensity of stiffener is greater than the intensity of second insulating part, the stiffener is difficult to appear circumstances such as fracture for the pole can not sink relative apron, has guaranteed the stable in structure of top cap subassembly.

Description

Top cover assembly, battery cell, battery and electricity utilization device

Technical Field

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

Background

The secondary battery generally includes a case, an electrode assembly received in and protected by the case, and a top cap assembly sealing an opening provided in the case.

The top cap assembly generally includes a cover plate and a pole mounted on the cover plate. In the prior art, a groove is formed in the peripheral wall of the pole, and an upper plastic part is formed between the peripheral wall of the pole and the mounting hole of the cover plate in an injection molding manner, so that the pole is fixed on the cover plate. At this time, the upper plastic part is provided with a supporting structure embedded in the groove.

When the pole receives pressure in its direction of height, can exert pressure to the bearing structure of last plastic embedding pole, because go up the thickness of bearing structure that the plastic self material and pole highly restricted lead to embedding pole is difficult to increase, bearing structure's bearing capacity is weaker to bearing structure appears breaking easily when the pole receives great pressure, destroyed etc. inefficacy condition, leads to the pole to sink with respect to the apron, causes top cap subassembly structure unstable, influences the security performance of secondary battery.

Disclosure of Invention

Based on this, it is necessary to provide a top cover assembly, a battery cell, a battery and electric equipment for improving the above-mentioned defects, which are necessary to solve the problems that in the prior art, the pressure bearing capability of the upper plastic part is weak, so that when the pole is subjected to a large pressure, failure conditions such as breakage, damage and the like easily occur, the pole is sunk relative to the cover plate, and the structure of the top cover assembly is unstable, and the safety performance of the secondary battery is affected.

A header assembly, comprising:

the cover plate is provided with a mounting hole;

the first insulating piece is arranged on the back surface of the cover plate;

the pole is penetrated through the mounting hole, an accommodating hole is formed in the peripheral wall of the pole, and the accommodating hole extends along the radial direction of the pole;

one end of the reinforcing rod extends into the accommodating hole of the pole, and the other end of the reinforcing rod extends out of the pole;

the second insulating part is arranged on the front face of the cover plate, the second insulating part is arranged between the mounting hole of the cover plate and the peripheral wall of the pole in an injection molding mode, the second insulating part wraps one end of the reinforcing rod extending out of the pole, and the strength of the reinforcing rod is larger than that of the second insulating part.

In one embodiment, an annular groove is formed in the peripheral wall of the pole, and the bottom surface of the groove is provided with the accommodating hole; the inner side wall of the second insulating piece is provided with an annular bulge, and the annular bulge is arranged in the annular groove.

In one embodiment, an end of the reinforcing rod remote from the pole extends outside the mounting hole.

In one embodiment, the number of the accommodating holes is plural, the plurality of the accommodating holes are uniformly arranged along the circumferential direction of the pole, and each accommodating hole is internally provided with one reinforcing rod.

In one embodiment, the pole comprises a cylinder and a plate disposed at an end of the cylinder adjacent to the electrode assembly, the plate having a dimension greater than a radial dimension of the cylinder.

In one embodiment, the top cover assembly further comprises a sealing ring sleeved on the pole and located between the first insulating member and the pole, and the sealing ring is used for sealing a gap between the pole and the cover plate.

In one embodiment, two pole posts are arranged on the cover plate in an insulating manner, and the two pole posts are distributed at two ends of the cover plate in the length direction.

Above-mentioned top cap subassembly, when the utmost point post received pressure along its direction of height, can exert pressure to the stiffener, because the intensity of stiffener is greater than the intensity of second insulating part, the stiffener is difficult to appear circumstances such as fracture for the utmost point post can not sink relative apron, thereby can guarantee the stable in structure of top cap subassembly, further guarantee the free security performance of battery.

In addition, the utility model also provides a battery monomer, a battery and an electric device.

A battery cell comprising:

a shell, wherein an opening is formed in one side of the shell;

an electrode assembly housed in the case;

the top cap assembly according to the above preferred embodiment seals the opening provided in the housing.

A battery comprising a plurality of cells as described in the preferred embodiments above.

An electrical device comprising a battery cell as described in the above preferred embodiments or a battery as described in the above preferred embodiments.

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 schematic cross-sectional view of a top cap assembly in the battery cell of fig. 1;

FIG. 3 is an enlarged schematic view of the structure within the circle of FIG. 2;

fig. 4 is a schematic view of the structure of a terminal of the cap assembly in the battery cell shown in fig. 1.

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 and a battery cell. 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 can be used as a driving power supply, so that the battery can replace fossil fuel to provide driving power.

The battery may be a battery pack or a battery module. When the battery is a battery pack, the battery pack specifically includes a Battery Management System (BMS) and a plurality of the battery cells. The battery management system is used for controlling and monitoring the working states of the battery monomers. In addition, a plurality of battery cells can be connected in series and/or in parallel and form a battery module together with a module management system, and then the battery modules are electrically connected in series, in parallel or in a mode of mixing the series and the parallel and form a battery pack together with the battery management system.

The battery pack or the battery module can be arranged on a supporting structure such as a box body, a frame and a bracket, and the battery cells can be electrically connected through a confluence part. The battery cell may be a lithium ion battery, a sodium ion battery or a magnesium ion battery, and its external contour may be a cylinder, a flat body, a cuboid or other shapes, but is not limited thereto. In this embodiment, the battery cell is a lithium ion prismatic battery.

Referring to fig. 1, a battery cell 10 according to a preferred embodiment of the present utility model includes a case 500, an electrode assembly, and a cap assembly 100.

The case 500 has a hollow structure having an accommodating space therein for accommodating the electrode assembly, the electrolyte, and other components. An opening (not shown) is provided at one side of the case 500, and the electrode assembly can be mounted in the case 500 through the opening of the case 500. Since the battery cell 10 in the present embodiment is a square battery, the outer contour of the case 500 has a rectangular parallelepiped shape.

The electrode assembly is a core member of the battery cell 10, and is housed in the case 500. In order to adapt to the shape of the case 500, the electrode assembly in this embodiment has a rectangular parallelepiped shape. The electrode assembly includes a bare cell 200 and an insulating sheet 300.

Each electrode assembly may include one or more bare cells 200. The bare cell 200 may be formed by winding or laminating 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, and the bare cell 200 formed by winding may be pressed into a flat shape. The bare cell 200 has a positive tab and a negative tab, which are used for respectively leading out the positive plate and the negative plate. Wherein the positive electrode ear and the negative electrode ear are positioned on the same side of the bare cell 200. In this embodiment, the positive electrode tab and the negative electrode tab are both located on top of the bare cell 200.

The insulating sheet 300 is coated on the outer circumference of the bare cell 200 and exposes the positive electrode tab and the negative electrode tab. The insulating sheet 300 can protect the bare cell 200 and has a good insulating effect between the bare cell 200 and the case 500. Specifically, the material of the insulating sheet 300 may be polyimide, polyethylene, polyvinylidene fluoride, or the like.

The cap assembly 100 is hermetically disposed at the opening of the case 500 to form a relatively closed environment inside the case 500, thereby isolating the electrode assembly from the external environment. The shape of the cap assembly 100 is adapted to the shape of the opening of the case 500, and in particular, in the present embodiment, the cap assembly 100 is substantially rectangular.

Referring to fig. 2 and 3, the top cap assembly 100 includes a pole 110, a cap plate 120, a first insulating member 130, a second insulating member 140 and a reinforcing rod 160.

The cover plate 120 is provided with mounting holes (not shown) for mounting the pole 110. The cover plate 120 may be formed of a material having high mechanical strength, such as aluminum, aluminum alloy, or stainless steel. The cover 120 is generally rectangular in shape. The cover 120 has a back surface and a front surface, wherein the back surface refers to a surface of the cover 120 facing the interior of the housing 500, i.e. a lower surface shown in fig. 2; the front surface of the cover plate 120 is referred to as the upper surface shown in fig. 2.

The cover plate 120 is generally provided with a liquid injection hole 121 penetrating in the thickness direction, and the liquid injection hole 121 is generally a circular hole. After the cap assembly 100 seals the opening of the case 500, an electrolyte may be injected into the inside of the case 500 through the injection hole. After the filling is completed, the sealing nails are welded on the cover plate 120 in a laser welding mode to seal the filling holes.

The cover plate 120 is also typically provided with an explosion-proof valve 122. When the gas pressure in the case 500 exceeds a threshold value, the explosion-proof valve 122 is opened to release the pressure in the case 500, thereby preventing the explosion of the battery cell 10. It should be apparent that in other embodiments, the explosion proof valve 122 on the header assembly 100 may be omitted, and the explosion proof valve 122 may be provided at the side wall or bottom wall of the housing 500.

The first insulating member 130 is disposed at the rear surface of the cap plate 120, and the first insulating member 130 can be abutted against the electrode assembly in the case 500, thereby limiting the electrode assembly. The first insulating member 130 is also provided with corresponding avoidance holes at positions corresponding to the mounting holes. The first insulating member 130 and the cover plate 120 have substantially the same shape and are rectangular, and may be formed of an insulating material such as plastic or rubber. The cover plate 120 and the first insulating member 130 are generally connected by clamping, bonding, or the like. Typically, the cover plate 120 and the first insulating member 130 are integrally formed by injection molding.

The pole 110 is inserted into the mounting hole, and one end of the pole 110 extending into the housing 500 is electrically connected with the positive electrode tab or the negative electrode tab of the bare cell 200. Specifically, in this embodiment, one end of the pole 110 extending into the housing 500 is electrically connected to the positive tab or the negative tab of the bare cell 200 through the connection piece 400. The upper surface of the connection piece 400 is welded to the post 110, and the lower surface of the connection piece 400 is welded to the positive tab or the negative tab of the bare cell 200, and the welding may be ultrasonic welding. The outer circumferential wall of the pole 110 is provided with a receiving hole 1121, and the receiving hole 1121 may be provided along a radial extension of the pole 110.

One end of the reinforcing rod 160 protrudes into the receiving hole 1121 of the pole 110, and the other end of the reinforcing rod 160 protrudes out of the pole 110. The reinforcing rod 160 may have a cylindrical shape to be adapted to the shape of the receiving hole 1121. The strength of the reinforcing bar 160 is greater than that of the second insulating member 140. The reinforcing bar 160 may be made of a metallic material having a relatively high structural strength, such as steel.

The second insulating member 140 is disposed on the front surface of the cover plate 120, the second insulating member 140 is disposed between the mounting hole of the cover plate 120 and the outer peripheral wall of the pole 110 in an injection molding manner, and the second insulating member 140 wraps the end of the reinforcing rod 160 extending out of the pole 110. The second insulator 140 may be molded of an insulating material such as plastic, rubber, or the like.

When the pole 110 is pressurized along the height direction thereof, a pressure is applied to the reinforcing rod 160, and since the strength of the reinforcing rod 160 is greater than that of the second insulating member 140, the reinforcing rod 160 is not easily broken, so that the pole 110 is not sunk relative to the cover plate 120, thereby ensuring the structural stability of the top cap assembly 100 and further ensuring the safety performance of the battery cell 10.

In the present embodiment, an annular groove 1122 is provided on the outer peripheral wall of the pole 110, and a receiving hole 1121 is provided at the bottom of the groove of the annular groove 1122; an annular protrusion (not shown) is provided on the inner sidewall of the second insulator 140, and the annular protrusion is disposed in the annular groove 1122. When the second insulating member 140 is injection-molded between the mounting hole of the cap plate 120 and the outer circumferential wall of the pole 110, at least a portion of the second insulating member 140 extends into the annular groove 1122 to form an annular protrusion, so that the second insulating member 140 can be connected with the pole 110 by the engagement of the annular protrusion with the annular groove 1122, and at this time, when the pole 110 is compressed in the height direction thereof, the annular protrusion can bear a part of the compression force, and the engagement of the reinforcing rod 160 can make the compression capacity of the pole 110 stronger. And the second insulating member 140 wraps the reinforcing rod 160 by a greater length than the end of the pole 110, which is beneficial to improving the connection strength between the reinforcing rod 160 and the second insulating member 140 and avoiding the damage to the second insulating member 140.

In this embodiment, the end of the reinforcing rod 160 remote from the pole 110 extends outside the mounting hole. In other words, the end of the reinforcing bar 160 remote from the pole 110 extends above the non-mounting hole area of the cap plate 120. In this way, the second insulating member 140 can wrap the reinforcing rod 160 with a sufficient length, which is beneficial to improving the connection strength between the reinforcing rod 160 and the second insulating member 140, and avoiding the second insulating member 140 from being damaged.

In the present embodiment, the number of the receiving holes 1121 is plural, and the plurality of receiving holes 1121 are uniformly arranged along the circumferential direction of the pole 110. Correspondingly, the number of the reinforcing rods 160 is equal to the number of the receiving holes 1121, and one reinforcing rod 160 is disposed in each receiving hole 1121. Specifically, the number of the receiving holes 1121 and the reinforcing bars 160 is four, and the four receiving holes 1121 are uniformly provided along the circumferential direction of the pole 110, and one reinforcing bar 160 is provided in each receiving hole 1121. Of course, the number of the reinforcing rods 160 and the number of the receiving holes 1121 may be two, three, five, etc., and are not limited thereto.

Referring to fig. 4, in the present embodiment, the pole 110 includes a column 112 and a plate 111, the column 112 is substantially cylindrical, the plate 111 is disposed at an end of the column 112 near the electrode assembly, the size of the plate 111 is larger than the radial size of the column 112, and the plate 111 is substantially rectangular. An annular groove 1122 is provided on the outer peripheral wall of the column 112, and a receiving hole 1121 is provided at the bottom surface of the annular groove 1122.

When in installation, the column 112 of the pole 110 firstly passes through the limit hole of the first insulating member 130 from the back surface of the cover plate 120 to the front surface of the cover plate 120, the installation hole of the cover plate 120 extends to the upper side of the cover plate 120 and enables the plate body 111 to be abutted against the first insulating member 130, then a plurality of reinforcing rods 160 are inserted into the accommodating holes 1121, and finally the second insulating member 140 is formed by injection molding and enables the reinforcing rods 160 to be wrapped by the second insulating member 140.

Since the size of the plate 111 is larger than the radial size of the column 112, the area of the welding area between the plate 111 and the tab or the connection piece 400 of the bare cell 200 becomes larger, which is beneficial for welding the tab 110 and the tab or the connection piece 400 of the bare cell 200.

In this embodiment, the top cover assembly 100 further includes a sealing ring 150, where the sealing ring 150 is sleeved on the pole 110 and located in the limiting hole of the first insulating member 130, for sealing the gap between the pole 110 and the cover plate 120. Thus, the electrolyte can be ensured not to leak.

In this embodiment, two poles 110 are disposed on the cover 120 in an insulating manner, and the two poles 110 can be distributed at two ends of the cover 120 in the length direction. The cover plate 120 is provided with two mounting holes, and the two poles 110 are respectively mounted in the two mounting holes. The two tabs 110 are connected to the positive electrode tab and the negative electrode tab, respectively, and serve as the positive electrode terminal and the negative electrode terminal of the battery cell 10, respectively.

Above-mentioned battery cell 10 and top cap subassembly 100, when the utmost point post 110 receives pressure along its direction of height, can exert pressure to stiffener 160, because stiffener 160 intensity is greater than the intensity of second insulator 140, the circumstances such as fracture are difficult to appear in stiffener 160 for utmost point post 110 can not sink relative apron 120, thereby can guarantee the stable in structure of top cap subassembly 100, further guarantee the security performance of 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. A header assembly, comprising:

the cover plate is provided with a mounting hole;

the first insulating piece is arranged on the back surface of the cover plate;

2. The top cap assembly according to claim 1, wherein an annular groove is provided on an outer peripheral wall of the pole, and a bottom surface of the annular groove is provided with the receiving hole; the inner side wall of the second insulating piece is provided with an annular bulge, and the annular bulge is arranged in the annular groove.

3. The cap assembly of claim 1, wherein an end of the reinforcement bar remote from the pole extends outside of the mounting hole.

4. The top cap assembly according to claim 1, wherein the number of the receiving holes is plural, the plurality of receiving holes are uniformly provided along the circumferential direction of the pole, and one of the reinforcing rods is provided in each of the receiving holes.

5. The cap assembly of claim 1, wherein the post comprises a post and a plate, the plate being disposed at an end of the post adjacent the electrode assembly, the plate having a dimension greater than a radial dimension of the post.

6. The top cap assembly of claim 1, further comprising a sealing ring sleeved on the pole and located between the first insulator and the pole, the sealing ring for sealing a gap between the pole and the cover plate.

7. The top cover assembly according to any one of claims 1 to 6, wherein two of the poles are provided on the cover plate in an insulating manner, and the two poles are distributed at both ends in a longitudinal direction of the cover plate.

8. A battery cell, comprising:

a shell, wherein an opening is formed in one side of the shell;

an electrode assembly housed in the case;

the cap assembly of any one of claims 1-7, wherein the cap assembly seals an opening provided to the housing.

9. A battery comprising a plurality of cells according to claim 8.

10. An electrical device comprising a battery cell as claimed in claim 8 or a battery as claimed in claim 9.