CN220065932U - Battery shell, battery unit, battery and electricity utilization device - Google Patents

Abstract

The utility model relates to a battery cell, which comprises two oppositely arranged main surfaces and two oppositely arranged side surfaces, wherein a plurality of limiting protrusions are respectively arranged at two ends of each main surface in the length direction, and the limiting protrusions are arranged on the inner wall of the main surface at intervals along the width direction of the main surface. The plurality of limit protrusions can enhance the structural strength of the main surface, so that the main surface is not easy to generate roughness, and the attractive appearance of the battery monomer is ensured; on the other hand plays a role in limiting the top cover assembly, so that the top cover assembly and the battery cell assembly keep a reasonable distance. Because a plurality of spacing protruding intervals set up on the inner wall of main face, can release battery case's stress for spacing protruding is convenient for machine-shaping, and is favorable to releasing the thermal stress that produces when welding, has guaranteed the welding effect. Because the structural strength at both ends of the battery shell is enhanced, the top cover assembly and the battery shell are assembled simply, and the assembly efficiency is high.

Description

Battery shell, battery unit, battery and electricity utilization device

Technical Field

The utility model relates to the technical field of new energy, in particular to a battery shell, a battery monomer, a battery and an electric device.

Background

At present, a cylindrical shell with two open ends is commonly adopted as a battery cell with a long battery structure, a battery cell assembly is arranged into a shell from one end of the cylindrical shell, then positive and negative lugs at two ends of the battery cell assembly are respectively connected with positive and negative poles on two top cover assemblies, and finally the two top cover assemblies are respectively welded with two ends of the cylindrical shell.

Because the wall thickness of the shell is thinner, the assembly difficulty of the top cover assembly and the shell is higher, and the assembly efficiency is low; the top cover component cannot be positioned relative to the shell, so that the top cover component is easy to prop against the battery core component to cause damage of the battery core component or the top cover component is too far away from the battery core component to cause redundancy of the electrode lugs, so that the two ends of the shell are tilted upwards, and the welding yield of the top cover component and the shell is affected; in the process of welding the top cover assembly and the shell, welding heat cannot be released, so that the main surfaces at the two ends of the shell are uneven, and the appearance of the battery cell is affected.

Disclosure of Invention

In view of the above, it is necessary to provide a battery case, a battery cell, a battery, and an electric device that have high assembly efficiency and high welding yield.

The battery shell comprises two oppositely arranged main surfaces and two oppositely arranged side surfaces, wherein a plurality of limiting protrusions are respectively arranged at two ends of each main surface in the length direction, and the limiting protrusions are arranged on the inner wall of the main surface at intervals along the width direction of the main surface.

In one embodiment, the limit projection is formed by projecting both ends of each of the main surfaces in the longitudinal direction from the outside of the main surface toward the inside thereof.

In one embodiment, each of the main surfaces has an end surface at each of both ends in the longitudinal direction, and the distance between the limiting projection and the corresponding end surface is 1mm-1.5mm.

In one embodiment, the height of the limit projection in the thickness direction of the main surface is 0.3mm-0.5mm.

In one embodiment, the battery shell is formed into a cylindrical structure by bending a metal plate for multiple times, and a gap for welding is reserved at the splicing position.

In one embodiment, the sheet metal material is aluminum or stainless steel.

In one embodiment, the wall thickness of the battery housing is 0.1mm.

According to the battery cell, the plurality of limiting protrusions are respectively arranged at the two ends of each main surface of the battery shell in the length direction and are arranged on the inner wall of the main surface at intervals along the width direction of the main surface, so that the structural strength of the main surface can be enhanced, the main surface is not easy to generate unevenness, and the attractive appearance of the battery cell is ensured; on the other hand plays the effect of spacing to the top cap subassembly for top cap subassembly and electric core subassembly keep reasonable distance, neither can be because the too near top of distance supports electric core subassembly and causes electric core subassembly's damage, also can not be because the distance is too far so that the utmost point ear is lengthy and causes battery case both ends to warp and influence the welding yields of top cap subassembly and battery case. Because the plurality of limit protrusions are arranged on the inner wall of the main surface at intervals, compared with the limit protrusion which is only in a strip shape, the utility model can release the stress of the battery shell, so that the limit protrusion is convenient for processing and forming, is beneficial to releasing the thermal stress generated during welding, and ensures the welding effect. In addition, since the structural strength of both ends of the battery case is enhanced, even if the wall thickness of the battery case is thin, both ends of the battery case are not easily deformed so that the assembly of the top cap assembly and the battery case is simple, and the assembly efficiency is high.

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

A battery cell comprising:

the battery case according to the above preferred embodiment, both ends of the battery case having openings, respectively;

the battery cell assembly is accommodated in the battery shell;

and the two top cover assemblies are respectively and hermetically arranged at the openings at the two ends of the battery shell.

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 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 schematic view of a battery case according to a preferred embodiment of the present utility model;

fig. 2 is an enlarged schematic view of a portion a of the battery case 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 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. 1 and 2, a battery cell according to a preferred embodiment of the utility model includes a battery case 100, a battery cell assembly (not shown) and two top cap assemblies (not shown). The battery monomer has length direction, width direction and thickness direction, and the free length of battery is greater than the free width of battery far away, and the free thickness of battery is less for the battery monomer is whole to be long battery structure.

The battery case 100 has a hollow structure having an accommodating space therein for accommodating the battery cell assembly, the electrolyte, and other components. The battery case 100 has openings 140 at both ends thereof, and the battery cell assembly can be mounted in the battery case 100 through the openings 140 of the battery case 100. Since the battery cell in the present embodiment is a prismatic battery, the outer contour of the battery case 100 has a rectangular parallelepiped shape.

Battery housing 100 includes two oppositely disposed major faces 110 and two oppositely disposed side faces 120. Each of the main surfaces 110 is provided with a plurality of stopper projections 130 at both ends in the longitudinal direction, respectively, and the plurality of stopper projections 130 are provided on the inner wall of the main surface 110 at intervals in the width direction of the main surface 110. Specifically, in the present embodiment, each of the main faces 110 is provided with three stopper projections 130 at both ends in the longitudinal direction, respectively. Of course, the number of the limiting projections 130 may be two, four, etc., which is not limited herein.

The length of main surface 110 and the length of side surface 120 are equal, and the width of main surface 110 is larger than the width of side surface 120.

Since the plurality of limiting protrusions 130 are respectively arranged at two ends of each main surface 110 of the battery case 100 in the length direction and the plurality of limiting protrusions 130 are arranged on the inner wall of the main surface 110 at intervals along the width direction of the main surface 110, the plurality of limiting protrusions 130 can enhance the structural strength of the main surface 110, so that the main surface 100 is not easy to generate uneven, and the attractive appearance of the battery cell is ensured; on the other hand plays the effect of spacing to the top cap subassembly for top cap subassembly and electric core subassembly keep reasonable distance, neither can be because the too near top of distance supports the electric core subassembly and causes the damage of electric core subassembly, also can not be because the distance is too far so that the utmost point ear is lengthy and causes battery case 100 both ends to upwarp and influence the welding yields of top cap subassembly and battery case 100. Because the plurality of limiting protrusions 130 are arranged on the inner wall of the main surface 110 at intervals, compared with the method which only adopts one strip-shaped limiting protrusion 130, the method can release the stress of the battery shell 100, so that the limiting protrusion 130 is convenient for processing and forming, is beneficial to releasing the thermal stress generated during welding, and ensures the welding effect.

In addition, since the structural strength of both ends of the battery case 100 is enhanced, both ends of the battery case 100 are not easily deformed even though the wall thickness of the battery case 100 is thin, so that the assembly of the top cap assembly with the battery case 100 is simple and the assembly efficiency is high.

In the present embodiment, each of the main faces 110 is formed with a stopper projection 130 at both ends in the longitudinal direction thereof projecting from the outer side of the main face 110 toward the inner side thereof. For example, stamping from the outside of the main surface 110 to the inside thereof may be performed such that the outside of the main surface 110 forms the recess 132 and the inside of the main surface 110 forms the protrusion 131, and the protrusion 131 is the above-described limit protrusion 130. Thus, the forming mode of the limiting protrusion 130 is simpler.

The inner side of the main surface 110 is the side of the main surface 110 close to the accommodating space of the battery case 100, and the outer side of the main surface 110 is the side of the main surface 110 away from the accommodating space of the battery case 100.

In this embodiment, each of the main surfaces 110 has end surfaces 111 at both ends in the longitudinal direction, and the distance between the stopper protrusion 130 and the corresponding end surface 111 is 1mm-1.5mm. When the distance between the limiting protrusion 130 and the corresponding end surface 111 is less than 1mm, the top cover assembly is too close to the battery cell assembly to easily prop against the battery cell assembly; when the distance between the limit protrusion 130 and the corresponding end surface 111 is greater than 1.5mm, the top cover assembly is too far from the battery cell assembly, so that the tab is easily overlengthy.

The main surface 110 includes a first end and a second end opposite to each other in the longitudinal direction, the first end has a first end surface, the second end has a second end surface, the limit protrusion 130 located at the first end corresponds to the first end surface, and the limit protrusion 130 located at the second end corresponds to the second end surface.

In this embodiment, the height of the stopper protrusion 130 in the thickness direction of the main surface 110 is 0.3mm to 0.5mm. That is, the height of the part of the main surface 110 protruding toward the inside of the main surface 110 is 0.3mm to 0.5mm. When the height of the limit protrusion 130 in the thickness direction of the main surface 110 is less than 0.3mm, the limit effect of the battery case 100 on the top cap assembly is poor; when the height of the stopper protrusion 130 in the thickness direction of the main surface 110 is greater than 0.5mm, it is difficult to process the stopper protrusion 130 on the main surface 110 and damage to the main surface 110 is easily caused.

In this embodiment, the battery case 100 is formed into a cylindrical structure by bending a metal plate several times, and a slit a for welding is reserved at the splice. By welding the gap a, the metal plate can form a closed cylindrical structure, and the welding is simpler.

Further, the material of the metal plate may be aluminum or stainless steel.

In the present embodiment, the wall thickness of the battery case 100 is 0.1mm. When the wall thickness of the battery case 100 is maintained at 0.1mm, the structural strength of the battery case 100 can be ensured and the battery cell energy density can be increased.

The battery cell assembly is a core member of the battery cell and is housed in the battery case 100. To adapt to the shape of the battery case 100, the cell assembly in the present embodiment has a rectangular parallelepiped shape. Wherein, the electric core assembly includes bare cell.

Each cell assembly may include one or more bare cells. The bare cell can be formed by a positive plate, a negative plate and a diaphragm with an insulating function between the negative plate and the positive plate in a winding or lamination mode, and the bare cell formed by winding can be pressed into a flat shape. In this embodiment, each of the battery cell assemblies includes a bare battery cell having a positive electrode tab and a negative electrode tab, where the positive electrode tab and the negative electrode tab are used to respectively lead out the positive electrode tab and the negative electrode tab. In this embodiment, the positive electrode tab and the negative electrode tab are located at two ends of the cell assembly in the length direction.

The two top cap assemblies are respectively sealed at the openings 140 provided at both ends of the battery case 100 to form a relatively closed environment inside the battery case 100, thereby isolating the battery cell assembly from the external environment.

The top cap assembly generally comprises a pole, and the poles of the two top cap assemblies are respectively connected with the positive and negative lugs of the battery cell assembly to serve as a positive terminal and a negative terminal of the battery cell. Specifically, the post as the positive electrode terminal may be an aluminum post, and the post as the negative electrode terminal may be a copper post.

The top cover assembly is also generally provided with a liquid injection hole (not shown) penetrating in the thickness direction, and the liquid injection hole is generally a circular hole. After the top cap assembly seals the opening 140 of the battery case 100, an electrolyte may be injected into the inside of the battery case 100 through the injection hole. After the liquid injection is completed, the sealing nails are welded on the top cover component in a laser welding mode to seal the liquid injection holes. The shape of the top cap assembly is adapted to the shape of the opening 140 of the battery case 100, and in particular, in the present embodiment, the top cap assembly is substantially rectangular.

The top cover assembly is also typically provided with an explosion-proof valve. When the gas pressure in the battery case 100 exceeds a threshold value, the explosion-proof valve is opened to release the pressure in the battery case 100, thereby preventing the explosion of the battery cell.

In the above battery case 100 and the battery unit, since the plurality of limiting protrusions 130 are respectively disposed at two ends of each main surface 110 of the battery case 100 in the length direction, and the plurality of limiting protrusions 130 are disposed on the inner wall of the main surface 110 at intervals along the width direction of the main surface 110, the plurality of limiting protrusions 130 can enhance the structural strength of the main surface 110, so that the main surface 100 is not easy to generate roughness, and the appearance of the battery unit is ensured to be attractive; on the other hand plays the effect of spacing to the top cap subassembly for top cap subassembly and electric core subassembly keep reasonable distance, neither can be because the too near top of distance supports the electric core subassembly and causes the damage of electric core subassembly, also can not be because the distance is too far so that the utmost point ear is lengthy and causes battery case 100 both ends to upwarp and influence the welding yields of top cap subassembly and battery case 100. Because the plurality of limiting protrusions 130 are arranged on the inner wall of the main surface 110 at intervals, compared with the method which only adopts one strip-shaped limiting protrusion 130, the method can release the stress of the battery shell 100, so that the limiting protrusion 130 is convenient for processing and forming, is beneficial to releasing the thermal stress generated during welding, and ensures the welding effect. In addition, since the structural strength of both ends of the battery case 100 is enhanced, both ends of the battery case 100 are not easily deformed even though the wall thickness of the battery case 100 is thin, so that the assembly of the top cap assembly with the battery case 100 is simple and the assembly efficiency is high.

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 (10)

1. The battery shell is characterized by comprising two oppositely arranged main surfaces and two oppositely arranged side surfaces, wherein a plurality of limiting protrusions are respectively arranged at two ends of each main surface in the length direction, and the limiting protrusions are arranged on the inner wall of the main surface at intervals along the width direction of the main surface.

2. The battery case according to claim 1, wherein both ends of each of the main faces in the longitudinal direction are projected from the outer side of the main face toward the inner side thereof to form the stopper projection.

3. The battery case according to claim 1, wherein each of the main surfaces has end surfaces at both ends in a longitudinal direction, and the spacing projections are spaced from the corresponding end surfaces by a distance of 1mm to 1.5mm.

4. The battery case according to claim 1, wherein the height of the limit projection in the thickness direction of the main surface is 0.3mm to 0.5mm.

5. The battery case according to claim 1, wherein the battery case is formed in a cylindrical structure by bending a metal plate material a plurality of times, and a slit for welding is reserved at the splice.

6. The battery case according to claim 5, wherein the metal plate material is aluminum or stainless steel.

7. The battery housing of claim 1, wherein the wall thickness of the battery housing is 0.1mm.

8. A battery cell, comprising:

the battery case according to any one of claims 1 to 7, both ends of the battery case having openings, respectively;

the battery cell assembly is accommodated in the battery shell;

and the two top cover assemblies are respectively and hermetically arranged at the openings at the two ends of the battery shell.

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.