CN219575884U

CN219575884U - Battery monomer, battery and power consumption device

Info

Publication number: CN219575884U
Application number: CN202320188113.3U
Authority: CN
Inventors: 张方超; 余鹏; 何金磊; 徐晓东
Original assignee: Shanghai Lanjun New Energy Technology Co Ltd
Current assignee: Shanghai Lanjun New Energy Technology Co Ltd
Priority date: 2023-02-08
Filing date: 2023-02-08
Publication date: 2023-08-22
Anticipated expiration: 2033-02-08

Abstract

The utility model relates to a battery cell, which comprises a shell, a cell assembly, a top cover assembly and a switching piece. The adapter piece comprises a first connecting part and a second connecting part, and the height of the second connecting part is lower than that of the first connecting part. The first connection portion of the tab is welded to the base of the post, and the second connection portion of the tab extends between the tab base portion 2111 and the bent portion 2112 and is welded to the lower surface of the bent portion 2112, so that the second connection portion and the tab overlap in the height direction of the battery cell. The distance between the battery cell assembly and the pole base is equal to the height of the pole lug plus the height difference between the first connecting part and the second connecting part, and the thickness of the pole lug is subtracted. Therefore, the distance between the battery cell assembly and the pole base can be obviously shortened, and the space saved in the shell can be used for arranging the battery cell assembly with larger volume, so that the space utilization rate in the shell is higher. Therefore, the battery cell energy density is improved. In addition, the utility model also provides a battery and an electric device.

Description

Battery monomer, battery and power consumption device

Technical Field

The utility model relates to the technical field of new energy, in particular to a battery monomer, a battery 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 top cover component is provided with a pole, and the pole lug of the battery core component is connected with the pole on the top cover component through the switching piece, so that a complete overcurrent loop is formed.

Currently, the applicant generally adopts a structure as shown in fig. 1 when assembling a secondary battery. The lug occupies a certain space in the height direction of the battery after being bent, the upper surface of the switching sheet is welded with the base of the pole, and the lower surface of the switching sheet is welded with the upper surface of the bent lug. Therefore, the distance between the pole base and the top of the battery cell assembly is equal to the sum of the height of the pole lug after bending and the thickness of the switching piece, so that the distance between the pole bottom and the battery cell assembly is larger, the space utilization rate inside the shell is lower, and the energy density of the battery is limited.

Disclosure of Invention

In view of the above, it is necessary to provide a battery cell capable of improving energy density.

A battery cell comprising:

a housing having at least one side opened;

the battery cell assembly is accommodated in the shell and is provided with a tab, and the tab comprises a base and a bending part connected with the base;

the top cover assembly is hermetically arranged at the opening of the shell and comprises a cover plate and a pole penetrating through the cover plate; a kind of electronic device with high-pressure air-conditioning system

The switching piece comprises a first connecting part and a second connecting part, the height of the second connecting part is lower than that of the first connecting part, and the first connecting part is welded with the base of the pole;

the second connecting part stretches into the space between the base part and the bending part and is welded with the lower surface of the bending part.

In one embodiment, the thickness of the bending portion is smaller than the height difference between the first connecting portion and the second connecting portion.

In one embodiment, the difference in height between the first and second connection portions is 0.1mm to 3mm.

In one embodiment, the first connection portion and the second connection portion are parallel to each other and perpendicular to the axis of the pole.

In one embodiment, the bend is perpendicular to the axis of the pole.

In one embodiment, the bending portion bends along a direction opposite to the pole, the adapter piece further comprises a transition portion connecting the first connecting portion and the second connecting portion, the transition portion is provided with a position avoiding hole, and the bending portion penetrates through the position avoiding hole so that the second connecting portion stretches into the space between the base portion and the bending portion.

In one embodiment, the battery cell assembly includes two bare battery cells, the adapter piece includes one first connecting portion and two second connecting portions respectively located at two opposite side edges of the first connecting portion, and the two second connecting portions are respectively welded with the tabs of the two bare battery cells.

In one embodiment, the tab includes a positive tab and a negative tab at the same end of the battery cell assembly, and the cover plate is provided with two tabs, and the two tabs are welded with the negative tab and the positive tab respectively through two adapter plates.

According to the battery cell, the first connecting part of the switching sheet is welded with the base of the pole column, and the second connecting part of the switching sheet stretches into the space between the base of the pole lug and the bending part and is welded with the lower surface of the bending part, so that the second connecting part and the pole lug are overlapped in the height direction of the battery cell. The distance between the battery cell assembly and the pole base is equal to the height of the pole lug plus the height difference between the first connecting part and the second connecting part, and the thickness of the pole lug is subtracted. Therefore, the distance between the battery cell assembly and the pole base can be obviously shortened, and the space saved in the shell can be used for arranging the battery cell assembly with larger volume, so that the space utilization rate in the shell is higher. Therefore, the battery cell energy density is improved.

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

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

An electrical device comprising a battery cell as described in any of 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 utility model 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, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a cross-sectional view of a battery cell according to the prior art;

FIG. 2 is an exploded view of a battery cell according to a preferred embodiment of the present utility model;

fig. 3 is a front view of the battery cell shown in fig. 2;

FIG. 4 is a cross-sectional view of the battery cell shown in FIG. 3 taken along line A-A;

FIG. 5 is an enlarged schematic view of a portion B of the battery cell shown in FIG. 4;

fig. 6 is a schematic structural view of the transfer tab of the battery cell shown in fig. 2.

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 utility model 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. 2 to 4, a battery cell 10 according to a preferred embodiment of the present utility model includes a housing 100, a cell assembly 200, a cap assembly 300, and a transfer tab 400.

The case 100 has a hollow structure having an accommodating space therein for accommodating the battery cell assembly 200, the electrolyte, and other components. At least one side of the housing 100 is formed with an opening (not shown) through which the cell assembly 200 can be mounted in the housing 100. Since the case 100 in the present embodiment is applied to a square battery, the external contour of the case 100 has a rectangular parallelepiped shape.

The battery cell assembly 200 is a core member of the battery cell 10, and is housed in the case 100. To adapt to the shape of the housing 100, the cell assembly 200 in this embodiment is substantially rectangular. The battery cell assembly 200 generally includes a bare cell 210 and an insulating sheet 220, where the insulating sheet 220 can protect the bare cell 210 and perform a better insulating function between the bare cell 210 and the inner wall of the housing 100. Specifically, the material of the insulating sheet 220 may be polyimide, polyethylene, polyvinylidene fluoride, or the like. Each of the battery cell assemblies 200 may include one or more bare battery cells 210, each of the bare battery cells 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 battery cells 210 formed by winding may be pressed into a flat shape.

The battery cell assembly 200 has a tab 211, and the tab 211 is disposed on the bare cell 210. Specifically, the tab 211 is divided into a positive tab (not shown) and a negative tab (not shown), which are led out from the positive and negative tabs of the bare cell 210, respectively, and the insulating sheet 220 is coated on the outer peripheral side of the bare cell 210 and exposes the tab 211. The positive electrode tab and the negative electrode tab may be located at the same end of the battery cell assembly 200, or may be located at opposite ends of the battery cell assembly 200. Specifically, in this embodiment, the positive electrode tab and the negative electrode tab are located at the same end of the cell assembly 200, i.e. the top end as shown in fig. 4.

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 particular, in the present embodiment, the top cover assembly 300 is substantially rectangular.

The top cover assembly 300 includes a cover plate 310 and a pole 320, wherein the pole 320 is mounted on the cover plate 310 and penetrates through the cover plate 310 along the thickness direction. The cover plate 310 may be formed of a material having high mechanical strength, such as aluminum, aluminum alloy, or stainless steel.

The cover plate 310 is generally provided with a liquid injection hole (not shown) penetrating in the thickness direction, and the liquid injection hole is generally a circular hole, so that after the top cover assembly 300 seals the opening of the case 100, the electrolyte can be injected into the case 100 through the liquid injection hole. After the liquid injection is completed, the liquid injection hole is also plugged in a laser welding mode. Further, an explosion-proof valve (not shown) is typically provided on the cover plate 310. When the gas pressure in the case 100 exceeds a threshold value, the explosion-proof valve is opened to release the pressure in the case 100, thereby preventing the explosion of the battery cell 10.

The cover 310 is provided with a mounting hole (not shown) through which the pole 320 passes. Specifically, the pole 320 is inserted into the mounting hole, and the pressing ring presses the pole 320 against the edge of the mounting hole. Moreover, the upper and lower sides of the cap plate 310 may be further formed with upper and lower plastics by injection molding to insulate and seal between the pole 320 and the cap plate 310.

The base of the post 320 extends into the housing 100 and is electrically connected to the tab 211 of the cell assembly 200 via the tab 400. In this way, the pole 320 can serve as a terminal of the battery cell 10. Specifically, both sides of the adapter piece 400 are welded with the bases of the tab 211 and the post 320 of the battery cell assembly 200 respectively. The electrode 320 connected to the positive tab of the battery cell assembly 200 may be used as the positive terminal of the battery cell 10, and the electrode 320 connected to the negative tab may be used as the negative terminal of the battery cell 10. The positive electrode 320 may be an aluminum electrode, and the negative electrode 320 may be a copper electrode.

The switching sheet 400 is of a metal plate structure, and specifically, the switching sheet 400 for connecting the positive tab with the positive post 320 may be an aluminum sheet, and the switching sheet 400 for connecting the negative tab with the negative post 320 may be a copper sheet.

In particular, in the present embodiment, since the positive tab and the negative tab of the battery cell assembly 200 are located at the same end, the housing 100 only needs to be opened at one side. Accordingly, only one cap assembly 300 needs to be provided. At this time, two posts 320 are disposed on the cover 310, and the two posts 320 are welded with the negative electrode tab and the positive electrode tab through two adapter tabs 400, so as to be used as the positive electrode terminal and the negative electrode terminal of the battery cell 10, respectively.

Referring to fig. 5 and 6, the tab 211 includes a base portion 2111 and a bending portion 2112 connected to the base portion 2111, and the bending portion 2112 is bent toward the pole 310. The switching piece 400 includes a first connection portion 410 and a second connection portion 420. Wherein the height of the second connection part 420 is lower than the height of the first connection part 410. That is, the second connection part 420 is sunk with respect to the first connection part 410 such that the distance between the second connection part 420 and the cap assembly 300 is greater than the distance between the first connection part 410 and the cap assembly 300, and a step is formed between the second connection part 420 and the first connection part 410.

The first connecting portion 410 and the second connecting portion 420 are generally rectangular. Further, the first connection portion 410 and the second connection portion 420 are integrally formed, so that the cost is low and the internal resistance of the switching piece 400 can be reduced. Specifically, the switching piece 400 may be formed by punching a flat plate-like metal sheet. Because of the height difference between the first connecting portion 410 and the second connecting portion 420, the adaptor 400 has a bent structure, rather than a flat plate shape, compared with the conventional adaptor 400' (see fig. 1).

The first connection portion 410 is welded to the base of the pole 320, and the second connection portion 420 extends between the base portion 2111 and the bent portion 2112 and is welded to the lower surface of the bent portion 2112. In this way, the second connection part 420 and the tab 211 overlap in the height direction (up-down direction shown in fig. 4) of the battery cell 10, so that the distance between the battery cell assembly 200 and the base of the post 320 can be reduced, thereby saving the space in the case 100. The space saved in the housing 100 can be used for installing the battery cell assembly 200 with larger volume, so that the space utilization rate in the housing 100 is higher, and the energy density of the battery cell 10 is improved.

In the present embodiment, the thickness of the bent portion 2112 is smaller than the height difference between the first connection portion 410 and the second connection portion 420. In this way, after the second connection portion 420 and the lower surface of the bent portion 2112 are welded, the bent portion 2112 can be completely accommodated in the step between the first connection portion 410 and the second connection portion 420, so that the upper surface of the bent portion 2112 is prevented from protruding from the upper surface of the first connection portion 410.

In the present embodiment, the height difference between the first connection part 410 and the second connection part 420 is 0.1mm to 3mm. When the difference in height between the first connection part 410 and the second connection part 420 is less than 0.1mm, the step therebetween is insufficient to accommodate the bent part 2112; when the height difference is greater than 3mm, the adapter plate 400 occupies a larger space in the housing 100, which is not beneficial to improving the energy density of the battery cell 10.

As shown in fig. 5, a specific type of battery cell 10 is illustrated, the thickness H1 of the plate body of the adapter piece 400 is 0.6mm, the thickness H2 of the tab 211 is 0.3mm, the height H3 of the tab 211 after bending is 3.5mm, and the height H0 between the first connection portion 410 and the second connection portion 420 is 0.5mm. Wherein, the distance h4=h3-h2+h0 between the cell assembly 200 and the base of the pole 320 is about 3.7mm.

In the conventional battery cell 10', as shown in fig. 1, the thickness h1 of the adapter tab 400' is 0.6mm, the thickness h2 of the tab 211 'is 0.3mm, and the height h3 of the tab 211' after bending is 3.5mm. Wherein, the distance h4=h3+h1 between the cell assembly 200 'and the base of the terminal 320' is about 4.1mm.

Therefore, on the premise that all parameters are kept unchanged, the distance between the cell assembly 200 and the base of the pole 320 in the battery cell 10 is significantly reduced compared with the conventional battery cell 10'.

In the present embodiment, the first connection portion 410 and the second connection portion 420 are parallel to each other and perpendicular to the axis of the pole 310. In this way, the structure of the battery cell 10 can be made more compact, thereby helping to further increase the energy density of the battery cell 10.

Further, in the present embodiment, the bent portion 2112 is perpendicular to the axis of the pole 310. In this manner, the bent portion 2112 will be substantially parallel to the second connection portion 420, thereby facilitating welding of the second connection portion 420 to the bent portion 2112.

In addition, in another embodiment, the bending portion 2112 is bent along a direction away from the pole 320, and the adapter piece 400 further includes a transition portion (not shown) connecting the first connecting portion 410 and the second connecting portion 420. The transition portion is provided with a clearance hole (not shown), and the bending portion 2112 passes through the clearance hole, so that the second connecting portion 420 extends between the base portion 2111 and the bending portion 2112.

In this embodiment, the bent portion 2112 of the tab 211 on the right side is bent rightward, and the bent portion 2112 of the tab 211 on the left side is bent leftward, as compared with the battery cell 10 shown in fig. 4. Moreover, the tab 211 is disposed near the middle of the cell assembly 200. After the bending portion 2112 passes through the clearance hole, the bending portion 2112 and the base portion 2111 are respectively located at the upper and lower sides of the second connecting portion 420, so that the welding of the second connecting portion 420 and the lower surface of the bending portion 2112 is facilitated.

In the battery cell 10, the first connection portion 410 of the adapter piece 400 is welded to the base of the pole 320, and the second connection portion 420 of the adapter piece 400 extends between the base portion 2111 and the bent portion 2112 of the tab 211 and is welded to the lower surface of the bent portion 2112, so that the second connection portion 420 and the tab 211 overlap in the height direction of the battery cell 10. The distance between the cell assembly 200 and the base of the pole 320 is equal to the height of the tab 211 plus the height difference between the first connection portion 410 and the second connection portion 420, and the thickness of the tab 211 is subtracted. It can be seen that the distance between the cell assembly 200 and the base of the terminal 320 can be significantly shortened, and the space saved in the housing 100 can be used for installing the cell assembly 200 with a larger volume, so that the space utilization in the housing 100 is higher. Therefore, the energy density of the battery cell 10 is improved.

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 battery cell, comprising:

a housing having at least one side opened;

2. The battery cell of claim 1, wherein the thickness of the bent portion is less than a height difference between the first connection portion and the second connection portion.

3. The battery cell of claim 1, wherein a height difference between the first connection portion and the second connection portion is 0.1mm to 3mm.

4. The battery cell of claim 1, wherein the first connection portion and the second connection portion are parallel to each other and perpendicular to an axis of the post.

5. The battery cell of claim 4, wherein the bend is perpendicular to an axis of the post.

6. The battery cell according to claim 1, wherein the bending portion bends in a direction away from the post, the adapter piece further includes a transition portion connecting the first connection portion and the second connection portion, the transition portion is provided with a clearance hole, and the bending portion passes through the clearance hole so that the second connection portion extends between the base portion and the bending portion.

7. The battery cell of claim 1, wherein the cell assembly comprises two bare cells, the adapter piece comprises a first connecting portion and two second connecting portions respectively located at two opposite side edges of the first connecting portion, and the two second connecting portions are respectively welded with the tabs of the two bare cells.

8. The battery cell according to any one of claims 1-7, wherein the tab comprises a positive tab and a negative tab at the same end of the cell assembly, and two tabs are provided on the cover plate and welded with the negative tab and the positive tab respectively through two tabs.

9. A battery comprising a plurality of cells according to any one of claims 1 to 8.

10. An electrical device comprising a battery cell according to any one of claims 1 to 8 or a battery according to claim 9.