CN220066000U - Battery monomer, battery and power consumption device - Google Patents

Abstract

The present utility model relates to a battery cell comprising: a shell, wherein an opening is formed in one side of the shell; the electrode assembly is accommodated in the shell and comprises a bare cell and an insulating sheet, and the insulating sheet is coated on the periphery of the bare cell; the bottom wall of the insulating sheet is provided with an expansion adhesive tape, and the expansion adhesive tape can expand along the thickness direction of the insulating sheet under the infiltration of electrolyte; and the top cover assembly is hermetically arranged at the opening of the shell. When the electrode assembly is mounted in the case and the electrolyte is injected into the case, the swelling tape swells in the thickness direction thereof under the infiltration of the electrolyte, thereby raising the whole electrode assembly. Therefore, the R angle contact between the edge of the electrode assembly and the bottom of the shell can be prevented, and the powder falling of the pole piece in the bare cell due to collision is avoided. The process of sticking the expansion adhesive tape on the bottom wall of the insulating sheet is simple and convenient and has low cost, thereby simplifying the production process and saving the production cost.

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 and an electrode assembly received in and protected by the case. The bottom of the shell is generally provided with an R angle, and the electrode assembly is easy to interfere with the R angle to cause pole piece powder falling. In order to avoid powder falling after the electrode assembly enters the shell, a thicker bottom supporting plate is generally arranged at the bottom of the electrode assembly, and the bottom supporting plate can heighten the electrode assembly so as to avoid contact between the electrode assembly and an R angle.

The bottom plate needs to be thermally fused with the bottom of the electrode assembly and then is integrally arranged in the shell together with the electrode assembly. Residues such as residues, wiredrawing or convex hulls are arranged on the surface of the welded printing plate after the bottom supporting plate is hot-melted, and damage can be caused to the electrode assembly. Moreover, the process of heat-fusing the bottom plate is complicated and the cost of the bottom plate is high, thereby resulting in high production cost of the secondary battery.

Disclosure of Invention

Based on this, it is necessary to provide a battery cell with low production cost in view of the above-described problems.

A battery cell comprising:

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

the electrode assembly is accommodated in the shell and comprises a bare cell and an insulating sheet, and the insulating sheet is coated on the periphery of the bare cell; the bottom wall of the insulating sheet is provided with an expansion adhesive tape, and the expansion adhesive tape can expand along the thickness direction of the insulating sheet under the infiltration of electrolyte; a kind of electronic device with high-pressure air-conditioning system

And the top cover assembly is hermetically arranged at the opening of the shell.

In one embodiment, the bottom wall of the insulating sheet is provided with one of the expansion tapes, and the expansion tape is arranged in the middle of the bottom wall of the insulating sheet.

In one embodiment, the ratio of the area of the expansion tape to the area of the bottom wall of the insulating sheet is between 1/3 and 1.

In one embodiment, the bottom wall of the insulating sheet is provided with two expansion tapes, and the two expansion tapes are arranged at intervals along the length direction of the bottom wall of the insulating sheet.

In one embodiment, the four corners of the bottom wall of the insulating sheet are provided with the expansion tapes, respectively.

In one embodiment, the initial thickness of the intumescent tape is between 0.1mm and 1 mm.

In one embodiment, a plurality of the expansion adhesive tapes are stacked along the thickness direction to form an expansion module, and the expansion module is arranged on the bottom wall of the insulating sheet.

In one embodiment, the expansion adhesive tape comprises a substrate layer and an adhesive layer coated on one side surface of the substrate layer, wherein the substrate layer is an OPS substrate, and the adhesive layer is an acrylic adhesive.

According to the battery cell, after the electrode assembly is arranged in the shell and electrolyte is injected into the shell, the expansion adhesive tape can expand along the thickness direction under the infiltration of the electrolyte, so that the whole electrode assembly is raised. Therefore, the R angle contact between the edge of the electrode assembly and the bottom of the shell can be prevented, and the powder falling of the pole piece in the bare cell due to collision is avoided. In addition, the process of sticking the expansion adhesive tape on the bottom wall of the insulating sheet is simpler and more convenient than that of the bottom wall hot melting bottom plate of the insulating sheet, and the cost of the expansion adhesive tape is lower than that of the bottom plate, so that the production process of the battery cell is simplified, and the production cost of the battery cell is saved.

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

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

fig. 2 is a partial cross-sectional view of the swelling tape 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 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, a battery cell 10 according to a preferred embodiment of the present utility model includes a case 100, an electrode assembly 200, a top cap assembly 300, and an expansion adhesive tape 500.

The case 100 has a hollow structure having an accommodating space therein for accommodating the electrode assembly 200, the electrolyte, and other components. An opening (not shown) is provided at one side of the case 100, and the electrode assembly 200 can be mounted in the case 100 through the opening of the case 100. The housing 100 is generally stamped and formed so that the inner wall and bottom wall thereof are transitioned by the R angle. Since the battery cell 10 in the present embodiment is a square battery, the outer contour of the case 100 has a rectangular parallelepiped shape.

The electrode assembly 200 is a core member of the battery cell 10, and is housed in the case 100. In order to adapt to the shape of the case 100, the electrode assembly 200 in the present embodiment has a rectangular parallelepiped shape. The electrode assembly 200 includes a bare cell 210 and an insulating sheet 220.

Each electrode assembly 200 may include one or more bare cells 210. The bare cell 210 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 210 formed by winding may be pressed into a flat shape. The bare cell 210 has a positive electrode tab 211 and a negative electrode tab 212, and the positive electrode tab 211 and the negative electrode tab 212 are used for respectively extracting a positive electrode sheet and a negative electrode sheet. Wherein the positive electrode tab 211 and the negative electrode tab 212 are positioned on the same side of the electrode assembly 200. Specifically, in the present embodiment, the positive electrode tab 211 and the negative electrode tab 212 are both positioned on top of the electrode assembly 200.

The insulating sheet 220 is coated on the outer periphery of the bare cell 210 and exposes the positive electrode tab 211 and the negative electrode tab 212. The insulating sheet 220 can protect the bare cell 210 and perform a better insulating function between the bare cell 210 and the bottom of the case 100. Specifically, the material of the insulating sheet 220 may be polyimide, polyethylene, polyvinylidene fluoride, or the like.

Referring to fig. 2, the bottom wall of the insulating sheet 220 is provided with an expansion tape 500, and the expansion tape 500 can expand along the thickness direction thereof under the immersion of the electrolyte so that the gap between the bottom wall of the insulating sheet 220 and the inner bottom wall of the case 100 becomes larger. The bottom wall of the insulating sheet 220 means one wall surface of the insulating sheet 220 facing the bottom of the case 110, that is, one wall surface of the insulating sheet 220 facing away from the positive electrode tab 211 and the negative electrode tab 212 when the electrode assembly 200 is mounted in the case 100. Since the electrode assembly 200 in this embodiment is substantially rectangular in shape and the insulating sheet 220 is also substantially rectangular in shape, the bottom wall of the insulating sheet 220 is rectangular.

When the electrode assembly 200 is mounted in the case 100 and electrolyte is injected into the case 100, the swelling tape 500 swells in the thickness direction thereof under the infiltration of the electrolyte, thereby elevating the overall electrode assembly 200. In this way, the edge of the electrode assembly 200 can be prevented from contacting the R corner of the bottom of the case 100, and thus the powder falling of the electrode sheet in the bare cell 210 due to collision can be avoided.

It follows that the expansion tape 500 can replace the prior art bottom plate. Since the process of attaching the expansion adhesive tape 500 to the bottom wall of the insulating sheet 220 is simpler and more convenient than the process of hot melting the bottom plate to the bottom wall of the insulating sheet 220 and the cost of the expansion adhesive tape 500 is lower than the cost of the bottom plate, the production process of the battery cell 10 is simplified and the production cost of the battery cell 10 is saved.

In addition, the battery cell 10 as a power battery often faces special working conditions of vibration and impact in the use process, and the expansion adhesive tape 500 can also play a better role in buffering and damping through self elastic deformation, so that the influence of vibration and impact on the bare cell 210 is reduced, the pole piece is effectively prevented from being damaged, and the reliability of the battery cell 10 is improved.

In an alternative embodiment, the bottom wall of the insulating sheet 220 is adhered with an expansion tape 500, and the expansion tape 500 is disposed at the middle of the bottom wall of the insulating sheet 220. The area of the expansion adhesive tape 500 may be equal to the area of the bottom wall of the insulating sheet 220, that is, the expansion adhesive tape 500 completely covers the bottom wall of the insulating sheet 220; the area of the expansion tape 500 may be smaller than the area of the bottom wall of the insulating sheet 220, that is, the expansion tape 500 covers only a portion of the bottom wall of the insulating sheet 220. In this way, the bare cell 210 can be lifted by sticking the expansion adhesive tape 500 on the bottom wall of the insulating sheet 220, and the process is simple and convenient.

Preferably, the ratio of the area of the swelling tape 500 to the area of the bottom wall of the insulating sheet 220 is between 1/3 and 1. Thus, the die 210 can be raised, and the cost of the expansion adhesive tape 500 can be saved.

In the present embodiment, two swelling tapes 500 are adhered to the bottom wall of the insulating sheet 220, and the two swelling tapes 500 are disposed at intervals along the length direction of the bottom wall of the insulating sheet 220. On the one hand, the bare cell 210 can be reliably lifted by using the two expansion tapes 500; on the other hand, the size of the swelling tape 500 is not required to be customized, and only the swelling tape 500 of a conventional specification may be used.

In another alternative embodiment, the bottom wall of the insulating sheet 220 is adhered with the swelling tape 500 at four corners, that is, the number of swelling tapes 500 is four. The number of the swelling tapes 500 may be three, five, etc., in addition to the above-mentioned one, two, and four, and is not limited thereto.

In this embodiment, the initial thickness of the intumescent tape 500 is between 0.1mm and 1 mm. After the swelling tape 500 is immersed in the electrolyte for 4 hours, the swelling tape 500 swells in the thickness direction thereof. The expanded thickness of the expanded adhesive tape 500 after expansion may be 3-5 times the initial thickness thereof, so that the bare cell 210 may be effectively raised. When the initial thickness of the expansion tape 500 is less than 0.1mm, the support of the electrode assembly 200 or the bare cell 210 is easily failed after the expansion tape 500 is expanded, thereby causing the bare cell 210 to still interfere with the R angle at the bottom of the case 100; when the initial thickness of the swelling tape 500 is greater than 1mm, the internal space of the case 100 is wasted, resulting in a decrease in the energy density of the battery cell 10. The initial thickness of the swelling tape 500 is set to 0.1mm to 1mm, so that the reliability and the energy density of the battery cell 10 can be well considered.

In an alternative embodiment, a plurality of expansion tapes 500 are stacked in the thickness direction thereof to form an expansion module, and the expansion module is adhered to the bottom wall of the insulating sheet 220. In this way, the number of the expansion tapes 500 to be stacked can be set, so that the height of the bare cell 210 can be set, that is, the size of the gap between the bottom wall of the insulating sheet 220 and the inner bottom wall of the case 100 can be controlled, and the safety of the bare cell 210 can be ensured.

Referring to fig. 2, in the present embodiment, the expansion adhesive tape 500 includes a substrate layer 520 and an adhesive layer 510 coated on one side surface of the substrate layer 520, wherein the substrate layer 520 may be an OPS substrate (heat-shrinkable film), and the adhesive layer 510 may be an acrylic adhesive. Of course, the swelling tape 500 may have any other structure in the prior art, as long as it can be swelled in the thickness direction after the electrolyte is impregnated, and is not limited thereto.

Referring again to fig. 1, 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 electrode assembly 200 from the external environment. The top cap assembly 300 is further 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 cap assembly 300 seals the opening of the case 100, the electrolyte may be injected into the inside of the case 100 through the injection hole. After the filling is completed, the sealing nails are welded on the top cover assembly 300 in a laser welding mode to seal the filling holes. 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 cap assembly 300 is also typically provided with an explosion proof valve (not shown). 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. It should be apparent that in other embodiments, the explosion proof valve on the header assembly 300 may be omitted and the explosion proof valve may be provided at the side wall or bottom wall of the housing 100.

In addition, the cap assembly 300 is further provided with a pole 310 in an insulating manner, and the pole 310 penetrates the cap assembly 300 in the thickness direction. Also, one end of the tab 310 protruding into the case 100 is electrically connected to the positive tab 211 or the negative tab 212 of the electrode assembly 200 through the switching tab 400. In general, one side of the tab 400 is welded to the post 310, and the other side of the tab 400 is welded to the positive tab 211 or the negative tab 212 of the electrode assembly 200. Of course, in other embodiments, the end of the terminal post 310 protruding into the case 100 is directly electrically connected to the positive tab 211 or the negative tab 212 of the electrode assembly 200, thereby omitting the switching tab 400.

The top cap assembly 300 is generally provided with two polar posts 310, the two polar posts 310 may be distributed at two ends of the top cap assembly 300 in the length direction, and the two polar posts 310 are respectively connected with the positive electrode tab 211 and the negative electrode tab 212, thereby respectively serving as the positive electrode terminal and the negative electrode terminal of the battery cell 10. Specifically, the post 310 as the positive electrode terminal may be an aluminum post, and the post 310 as the negative electrode terminal may be a copper post.

In the above-described battery cell 10, after the electrode assembly 200 is mounted in the case 100 and the electrolyte is injected into the case 100, the swelling tape 500 swells in the thickness direction thereof by the infiltration of the electrolyte, thereby raising the overall electrode assembly 200. In this way, the edge of the electrode assembly 200 can be prevented from contacting the R corner of the bottom of the case 100, and thus the powder falling of the electrode sheet in the bare cell 210 due to collision can be avoided. In addition, since the process of attaching the expansion adhesive tape 500 to the bottom wall of the insulating sheet 220 is simpler and more convenient than the process of hot melting the bottom plate to the bottom wall of the insulating sheet 220 and the cost of the expansion adhesive tape 500 is lower than the cost of the bottom plate, the production process of the battery cell 10 is simplified and the production cost of the battery cell 10 is saved.

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. A battery cell, comprising:

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

the electrode assembly is accommodated in the shell and comprises a bare cell and an insulating sheet, and the insulating sheet is coated on the periphery of the bare cell; the bottom wall of the insulating sheet is provided with an expansion adhesive tape, and the expansion adhesive tape can expand along the thickness direction of the insulating sheet under the infiltration of electrolyte; a kind of electronic device with high-pressure air-conditioning system

And the top cover assembly is hermetically arranged at the opening of the shell.

2. The battery cell according to claim 1, wherein the bottom wall of the insulating sheet is provided with one of the swelling tapes, and the swelling tape is provided in the middle of the bottom wall of the insulating sheet.

3. The battery cell of claim 2, wherein the ratio of the area of the intumescent tape to the area of the bottom wall of the insulating sheet is between 1/3 and 1.

4. The battery cell according to claim 1, wherein the bottom wall of the insulating sheet is provided with two of the swelling tapes, and the two swelling tapes are provided at an interval along the length direction of the bottom wall of the insulating sheet.

5. The battery cell according to claim 1, wherein the four corners of the bottom wall of the insulating sheet are provided with the swelling tape.

6. The battery cell of claim 1, wherein the initial thickness of the intumescent tape is between 0.1mm and 1 mm.

7. The battery cell according to claim 1, wherein a plurality of the swelling tapes are stacked in a thickness direction thereof to form a swelling module, and the swelling module is disposed at a bottom wall of the insulating sheet.

8. The battery cell of any one of claims 1-7, wherein the intumescent tape comprises a substrate layer and an adhesive layer coated on a side surface of the substrate layer, wherein the substrate layer is an OPS substrate and the adhesive layer is an acrylic adhesive.

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.