CN220934350U - Battery monomer and battery and electric equipment with same - Google Patents

Abstract

The utility model discloses a battery monomer, a battery with the battery monomer and electric equipment, wherein the battery monomer comprises: a housing having a receiving cavity; an electrode assembly disposed in the receiving chamber; an insulating film covering the electrode assembly, the insulating film having a first film region covering a bottom wall of the electrode assembly, the first film region being formed with a plurality of through holes arranged at intervals, the through holes penetrating the first film region in an up-down direction; the supporting plate is arranged between the first membrane area and the inner wall of the shell, and a channel structure which is communicated with the space on the upper side and the space on the lower side of the supporting plate is not arranged on the supporting plate. According to the battery cell, the electrode assembly is coated by the insulating film, the plurality of through holes are formed in the first film region of the insulating film, the supporting plate is arranged between the first film region and the inner wall of the shell and does not have a channel structure communicated with two sides, so that the situations of internal short circuit and shell corrosion leakage of the battery cell can be well reduced, and the risk of short circuit failure of the battery cell is greatly reduced.

Description

Battery monomer and battery and electric equipment with same

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery monomer, a battery with the battery monomer and electric equipment.

Background

The battery core is required to be subjected to a formation process in the production and processing process, and positive and negative active substances of the formed battery core are excited, so that the battery has the discharging capability, and the battery can be used as a power supply only after formation. In the process of battery formation, the short circuit condition of the shell and the electrode assembly easily occurs, so that the shell is corroded, and the battery core is disabled.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model aims to provide a battery cell which can well reduce the case of short circuit and leakage of the shell and reduce the risk of short circuit failure of the battery cell.

The utility model also provides a battery with the battery cell.

The utility model also provides electric equipment with the battery.

The battery cell according to the first aspect of the present utility model includes: a housing having a receiving cavity; an electrode assembly disposed within the receiving chamber; an insulating film covering the electrode assembly, the insulating film having a first film region covering a bottom wall of the electrode assembly, the first film region being formed with a plurality of through holes arranged at intervals, the through holes penetrating the first film region in an up-down direction; the support plate is arranged between the first film area and the inner wall of the shell, and a channel structure which is communicated with the space on the upper side and the space on the lower side of the support plate is not arranged on the support plate.

According to the battery cell, the electrode assembly is coated by the insulating film, the plurality of through holes are formed in the first film region of the insulating film, the supporting plate is arranged between the first film region and the inner wall of the shell and does not have a channel structure communicated with two sides, so that the situations of internal short circuit and shell corrosion leakage of the battery cell can be well reduced, and the risk of short circuit failure of the battery cell is greatly reduced.

In some embodiments of the utility model, the projections of the plurality of through holes are located within the projection of the pallet in a horizontal projection plane.

The projection of a plurality of through holes is set to be located the projection of layer board in this embodiment, makes the layer board can cut off through-hole and casing reliably, eliminates the channel structure of the direct intercommunication of through-hole and casing to can make electrode assembly have under the good exhaust condition, can reduce the casing well and appear corroding the condition of weeping, thereby greatly reduced battery monomer short circuit inefficacy risk.

In some embodiments of the utility model, the pallet is a non-porous pallet.

The embodiment sets up the layer board to the aporate layer board, simple structure, and processing manufacturing is convenient, and the layer board can have fine structural strength, makes the layer board play the effect of supporting the bed hedgehopping to electrode assembly well, simultaneously, can reduce the probability that the through-hole and the casing of first membrane district appear direct intercommunication steadily and reliably, makes the battery monomer appear the risk of short circuit inefficacy further decline in the formation in-process, can promote the free yield of battery to a certain extent.

In some embodiments of the present utility model, the pallet includes a pallet body, in which a first positioning hole penetrating the pallet body in an up-down direction is formed, and a blocking member provided at one side of the pallet body and covering the first positioning hole.

In this embodiment, set up the layer board into layer board body and shutoff piece, set up first locating hole on the layer board body, can be under the condition that plays good wall to through-hole and casing, make the assembly location of layer board and insulating film comparatively convenient, make the free equipment of battery comparatively convenient easy, and the shutoff piece can cut off first locating hole and casing to further reduced the probability that casing and electrode assembly pass through first locating hole direct intercommunication, made the free risk of inefficacy of battery further decline.

In some embodiments of the present utility model, a first positioning hole is formed on the supporting plate, a second positioning hole is formed on the insulating film, and a projection of the first positioning hole coincides with a projection of the second positioning hole in a horizontal projection plane and is arranged at intervals from a projection of the through hole.

In the embodiment, the positioning holes are arranged in a staggered manner with the through holes, so that the through holes and the shell are well prevented from being communicated with each other through the positioning holes, the situation that the shell is corroded and leaked is well reduced, and the short-circuit failure risk of the battery is well reduced.

In some embodiments of the utility model, the pallet has a thickness in the up-down direction of 0.1mm to 1.5mm.

The thickness of the supporting plate is limited between 0.1mm and 0.15mm, the supporting plate can be made to have enough thickness to lift the electrode assembly, the electrode assembly can be stably and well assembled in the accommodating cavity, the space occupied by the supporting plate in the accommodating cavity is small, and the battery cell can keep good energy density.

In some embodiments of the utility model, the ratio of the total area of the plurality of through holes to the area of the first film region is 1/4-2/3.

In this embodiment, the ratio of the total area of the plurality of through holes to the area of the first membrane area is limited to 1/4 to 2/3, so that the plurality of through holes on the first membrane area have enough total area to meet the exhaust requirement, and the exhaust at the electrode assembly is smoother, thereby reducing the short circuit condition, and the first membrane area has good insulation separation effect and connection strength, so that the support plate and the first membrane area cooperate to well separate the direct communication between the through holes and the shell, and the support plate can be stably connected and assembled with the first membrane area, so that the whole structure of the insulating film is more stable, and the electrode assembly can be well coated.

In one embodiment of the utility model, the ratio of the total area of the plurality of through holes to the area of the first film region is 1/3-1/2.

The ratio of the total area in the through holes to the area of the first membrane area is further limited to be 1/3 to 1/2, so that the battery cell can be stably and smoothly exhausted in the formation process, and the insulating membrane and the supporting plate can be well matched and assembled into the accommodating cavity and perform cladding insulation on the electrode assembly.

In some embodiments of the present utility model, the insulating film covers at least a bottom surface and a circumferential surface of the electrode assembly.

In this embodiment, the insulating film is disposed to cover at least the bottom surface and the peripheral surface of the electrode assembly, so that a stable and good insulating effect can be achieved between the peripheral surface of the electrode assembly and the peripheral wall of the accommodating cavity and between the bottom surface of the electrode assembly and the bottom wall of the accommodating cavity, the probability of short circuit of the battery cells is greatly reduced, and the insulating film has a simple structure and is convenient to assemble.

In some embodiments of the utility model, the battery cell further comprises: and the top cover assembly is connected with the shell and covers the opening.

In this embodiment, an opening is formed at the top of the casing, which can facilitate the assembly of the electrode assembly, the insulating film and other components in the battery cell with the casing, and a cap assembly cover opening is provided, and the cap assembly can be matched with the casing to form a sealed accommodating cavity structure, so that the electrode assembly and the like can be in a good running space.

In one embodiment of the present utility model, the top cap assembly further includes: and the protective sheet is arranged on one side of the top cover assembly, which is away from the electrode assembly.

In this embodiment, the protection sheet is covered on the side of the top cover assembly, which is far away from the electrode assembly, and the protection sheet can play a good insulating role, so that the short circuit condition of the contact between the shell and the electric connector is reduced, and the battery cell is smoother in electric connection. The protection sheet can also play a role in preventing scratch, so that the structure of a plurality of battery monomers is more stable and intact in the processes of transportation, assembly and the like, and the damage of the shell is reduced.

In one embodiment of the utility model, the electrode assembly includes one or more electrical cells connected to the pole of the cap assembly by a tab.

The embodiment is provided with the switching piece to connect the battery cell with the pole, so that the structure is simple, and the battery cell is connected with the pole more conveniently and easily.

The battery according to the second aspect of the utility model comprises the battery cell according to the first aspect of the utility model.

According to the battery provided by the utility model, the battery monomer of the first aspect is provided, the insulating film is arranged to cover the electrode assembly, the first film region of the insulating film is provided with the plurality of through holes, the supporting plate is arranged between the first film region and the inner wall of the shell and is not provided with the channel structures communicated with the two sides, so that the situations of internal short circuit and shell corrosion leakage of the battery monomer can be well reduced, and the risk of short circuit failure of the battery monomer is greatly reduced.

The powered device according to the third aspect of the utility model comprises a battery according to the second aspect of the utility model.

According to the electric equipment, the battery monomer is provided with the insulating film to cover the electrode assembly, the first film region of the insulating film is provided with the plurality of through holes, the supporting plate is arranged between the first film region and the inner wall of the shell and is not provided with the channel structures communicated with the two sides, so that the situations of internal short circuit of the battery monomer and corrosion and leakage of the shell can be well reduced, and the risk of short circuit failure of the battery monomer is greatly reduced.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

FIG. 1 is a schematic diagram of a powered device according to an embodiment of the present utility model;

fig. 2 is a schematic view of a battery cell according to an embodiment of the present utility model;

fig. 3 is an exploded view of a battery cell according to an embodiment of the present utility model;

Fig. 4 is a schematic view of a battery cell with a housing removed according to an embodiment of the present utility model;

Fig. 5 is a schematic view of another angle of the battery cell with the housing removed according to an embodiment of the present utility model;

fig. 6 is an exploded view of the battery cell shown in fig. 4 with the housing removed;

FIG. 7 is a schematic view of an insulating film and a pallet according to an embodiment of the utility model;

fig. 8 is a schematic view of another angle of the insulating film and the pallet according to an embodiment of the present utility model;

Fig. 9 is an exploded view of the insulating film and pallet shown in fig. 7;

fig. 10 is an exploded view of an insulating film with a pallet body and a closure according to another embodiment of the present utility model;

FIG. 11 is a schematic view of an insulating film with a pallet body and a closure according to another embodiment of the utility model;

fig. 12 is a schematic view of the insulating film of fig. 11 at another angle to the pallet body and plug.

Reference numerals:

10. A housing; 11. a protective film;

20. a top cover assembly; 21. a pole;

30. A transfer sheet; 40. a protective sheet; 50. an electrode assembly;

60. An insulating film; 61. a first membrane region; 611. a through hole; 601. a second positioning hole;

70. a supporting plate; 71. a pallet body; 72. a blocking member; 701. a first positioning hole;

100. a battery cell;

1000. A battery; 2000. a controller; 3000. a motor;

10000. And electric equipment.

Detailed Description

Embodiments of the technical scheme of the present utility model will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and thus are merely examples, and are not intended to limit the scope of the present utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model; the terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present utility model, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present utility model, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present utility model, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In the description of the embodiments of the present utility model, the azimuth or positional relationship indicated by the technical terms "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the azimuth or positional relationship shown in the drawings, merely for convenience of describing the embodiments of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the embodiments of the present utility model.

In the description of the embodiments of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present utility model will be understood by those of ordinary skill in the art according to specific circumstances.

Currently, the application of power batteries is more widespread from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and the like, and a plurality of fields such as military equipment, aerospace, and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

In the production process of the power battery, the battery monomer can have discharging capability after being formed and can be used as a power supply. When the battery monomer is formed, gas can be generated on the anode and cathode fluid of the electrode assembly, bubbles or air passages are formed in the electrolyte by the gas, and can prevent lithium ions from being combined with active substances on the cathode current collector, so that lithium dendrite is caused, and short circuit is caused in the battery monomer.

In the related art, in order to facilitate the exhaust of the electrode assembly, holes are formed in the insulating film on one side of the electrode assembly, so that gas can be smoothly exhausted from the positive and negative electrode fluids of the electrode assembly, thereby reducing the short circuit condition in the battery unit and enabling the negative current collector surface of the electrode assembly to form a good compact SEI film (solid electrolyte interface solid electrolyte interface). But the insulating film is provided with holes, so that an ion channel which is directly communicated is formed between the electrode assembly and the shell, and a negative electrode active material on a current collector on the electrode assembly is easy to contact with the shell through the holes to form a short circuit, so that a large risk of corrosion of the shell is caused, and a leakage condition of a battery monomer is caused.

Based on the above consideration, in order to reduce the risks of short-circuit failure of the battery monomer and corrosion leakage of the shell, the utility model designs the battery monomer, wherein a channel structure for cutting off direct communication between the electrode assembly and the shell is arranged between an opening of the insulating film and the shell in the battery monomer, so that the risks of short-circuit failure of the battery monomer and corrosion leakage of the shell are greatly reduced.

In the embodiment of the utility model, the battery cell can be a secondary battery, and the secondary battery refers to a battery cell which can be continuously used by activating the active material in a charging mode after the battery cell discharges. The battery monomer can be a lithium ion battery, a sodium lithium ion battery, a lithium metal battery, a nano metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-chromium battery, a lead storage battery and the like, and the battery monomer disclosed by the embodiment of the utility model can be used for electric equipment using the battery as a power supply or various energy storage systems using the battery as an energy storage element.

The powered device may be, but is not limited to, a cell phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft, and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For example, as shown in fig. 1, fig. 1 is a schematic structural diagram of an embodiment of the present utility model when electric equipment 10000 is a vehicle, the vehicle may be a fuel-oil vehicle, a gas-fired vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle or an extended range vehicle. The battery 1000 is provided in the interior of the vehicle, and the battery 1000 may be provided at the bottom or the head or the tail of the vehicle. The battery 1000 may be used for power supply of a vehicle, for example, the battery 1000 may be used as an operating power source of the vehicle. The vehicle may also include a controller 2000 and a motor 3000, the controller 2000 being configured to control the battery 1000 to power the motor 3000, for example, for operating power requirements during start-up, navigation and travel of the vehicle.

In some embodiments of the utility model, battery 1000 may be used not only as an operating power source for a vehicle, but also as a driving power source for a vehicle to provide driving power for the vehicle instead of or in part instead of fuel oil or natural gas.

In the present utility model, the battery 1000 refers to a single physical module including one or more battery cells 100 to provide higher voltage and capacity. For example, the battery 1000 referred to in the present utility model may include a battery module, a battery pack, or the like. The battery 1000 may include a case for packaging one or more battery cells 100 or a plurality of battery modules. The case can effectively prevent liquid or other foreign matter from affecting the charge or discharge of the battery cell 100. Of course, some batteries 1000 may not include the above-mentioned case and may be directly disposed in the battery installation compartment of the electric device 10000.

A battery cell 100 according to an embodiment of the first aspect of the present utility model is described below with reference to fig. 2 to 9. Fig. 2 is a schematic view of a battery cell 100 according to an embodiment of the present utility model; fig. 3 is an exploded view of a battery cell 100 according to an embodiment of the present utility model; fig. 4 is a schematic view of a battery cell 100 according to an embodiment of the present utility model with a housing 10 removed; fig. 5 is a schematic view of another angle of the battery cell 100 with the housing 10 removed according to an embodiment of the present utility model; fig. 6 is an exploded view of the battery cell 100 shown in fig. 4 with the case 10 removed; fig. 7 is a schematic view of an insulating film 60 and a pallet 70 according to an embodiment of the present utility model; fig. 8 is a schematic view of another angle of the insulating film 60 and the pallet 70 according to an embodiment of the present utility model; fig. 9 is an exploded view of the insulating film 60 and the pallet 70 shown in fig. 7; fig. 10 is an exploded view of an insulating film 60 with a pallet body 71 and a closure member 72 according to another embodiment of the present utility model; fig. 11 is a schematic view of an insulating film 60 with a pallet body 71 and a closure member 72 according to another embodiment of the present utility model; fig. 12 is a schematic view of the insulation film 60 shown in fig. 11 at another angle to the pallet body 71 and the stopper 72.

As shown in fig. 2 and 3, a battery cell 100 according to an embodiment of the first aspect of the present utility model includes: the case 10, the electrode assembly 50, the insulating film 60, and the support plate 70. Specifically, the housing 10 has an accommodating chamber; the electrode assembly 50 is disposed in the receiving chamber; the insulating film 60 covers the electrode assembly 50, the insulating film 60 having a first film region 61 covering the bottom wall of the electrode assembly 50, the first film region 61 being formed with a plurality of through holes 611 arranged at intervals, the through holes 611 penetrating the first film region 61 in the up-down direction (up-down direction as shown in fig. 3); the support plate 70 is disposed between the first film region 61 and the inner wall of the housing 10, and there is no channel structure on the support plate 70 to communicate the spaces on the upper and lower sides of the support plate 70.

In this embodiment, the housing 10 may have various shapes and various sizes, for example, the housing 10 may have a cylindrical shape, a quadrangular shape, etc., and the material of the housing 10 may be steel, iron, aluminum, alloy, etc. The case 10 protects the electrode assembly 50 in the battery cell 100, and particularly, when the battery cell 100 is assembled, the electrode assembly 50, electrolyte and the like are disposed in the accommodating cavity, and the case 10 can protect the external environment from an impact caused by external rubbing and isolate the external environment from the electrode assembly 50 well.

The case 10 may be formed in a hollow structure having one opening, the case 10 may be formed in a hollow structure having both ends open, and when the case 10 is a hollow structure having one opening, the electrode assembly 50 and the insulating film 60 are fitted into the receiving chamber from the opening, the battery cell 100 may be provided with a cap plate for closing the opening of the case 10, and when the case 10 is formed with both ends open, the cap plate is correspondingly provided with two. The cover plate may be made of the same material as the housing 10 or different from the housing 10, and the shape of the cover plate is matched with the shape of the opening of the housing 10.

The electrode assembly 50 generally includes a positive electrode sheet, which in some embodiments may include a positive electrode current collector and a positive electrode active material disposed thereon, a negative electrode sheet, which may include a negative electrode current collector and a negative electrode active material disposed thereon, and a separator.

The positive electrode current collector may be a metal foil or a composite current collector formed by forming a metal material, which may be aluminum, an aluminum alloy, a nickel alloy, a titanium alloy, or the like, on a polymer material, which may be polypropylene, polystyrene, polyethylene terephthalate, or the like. The positive electrode active material may be one or more of phosphate, lithium transition metal oxide, and respective modified compounds, and is not limited to the above materials.

The negative electrode current collector can be metal foil or composite current collector, and the negative electrode active material can be one or more of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, lithium titanate and the like. In another embodiment, the negative electrode sheet may be made of foam metal, such as foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, and the surface of the foam metal may or may not be provided with a negative electrode active material.

The material of the septum in this embodiment may be at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.

The electrode assembly 50 may be manufactured in a roll-to-roll or laminated manner, and the electrode assembly 50 may have a shape that matches the shape of the receiving chamber.

The insulating film 60 is coated on the outer surface of the electrode assembly 50, the insulating film 60 may completely or partially coat the outer surface of the electrode assembly 50, the insulating film 60 may be coated in a splicing manner, and the insulating film 60 may also coat the electrode assembly 50 in a hemming manner. The insulating film 60 may be made of a material having an insulating effect and resistant to an electrolyte such as polypropylene. The through holes 611 on the insulating film 60 may be provided with two, three, four, five, six, etc., the number and arrangement of the through holes 611 may be reasonably set according to the exhaust needs, and the shape and aperture of the through holes 611 may be reasonably set according to the needs.

The shape of the supporting plate 70 may be adapted to the shape of the bottom wall of the accommodating chamber, the supporting plate 70 may be a flat plate, the supporting plate 70 may be a curved plate, and the supporting plate 70 may be made of the same material as the insulating film 60. In the present embodiment, the support plate 70 is disposed between the first film region 61 and the inner wall of the housing 10, with the housing 10 on the side of the support plate 70 facing away from the first film region 61, and with the first film region 61 on the side of the support plate 70 facing away from the housing 10, with the plurality of through holes 611 disposed. The tray 70 has no channel structure for connecting the spaces on the upper and lower sides of the tray 70, such as through holes penetrating the upper and lower sides of the tray 70.

The insulating film 60 is provided to cover the electrode assembly 50 in this embodiment, which can play a good role in preventing scraping when the electrode assembly 50 is installed in the accommodating cavity, so that the electrode assembly 50 can be assembled with the housing 10 without damage, and the assembly efficiency of the battery cell 100 and the yield of the product can be improved to a certain extent.

During formation of the battery cell 100, the electrolyte in the receiving cavity may flow through the plurality of through holes 611 inside and outside the insulating film 60 and infiltrate into the electrode assembly 50, and the gas generated on the electrode assembly 50 may be discharged from the plurality of through holes 611 of the insulating film 60 to the receiving cavity space outside the insulating film 60.

In this embodiment, by providing the plurality of through holes 611 in the first film region 61 of the insulating film 60, the electrolyte can better infiltrate the electrode assembly 50 in the battery monomer 100, so that the electrode assembly 50 can be fully infiltrated, and further the formation effect of the battery monomer 100 is improved, specifically, taking the battery monomer 100 as the lithium ion battery 1000 as an example, the lithium ion electrode assembly 50 can form a good SEI film after being fully infiltrated, so that the electrode assembly 50 has good cycle performance and service life, and the good SEI film can reduce the occurrence of lithium dendrite in the formation process, thereby greatly reducing the probability of short circuit in the battery monomer 100.

In this embodiment, when the battery cell 100 is formed, the gas generated on the electrode assembly 50 can be timely discharged through the through hole 611, so that the excessive accumulation of the gas on the electrode assembly 50 is reduced to block the flow and intercalation process of lithium ions between the electrode assembly 50 and the electrolyte, and further the probability of short circuit caused by puncturing the membrane after crystallization of the lithium ions is reduced.

It can be understood that the negative electrode active material on the negative electrode sheet may have a situation of partial falling during the formation process, for example, when the negative electrode active material is soft carbon, the falling carbon powder may occur, and the falling carbon powder is easy to connect with the casing 10 through the through hole 611, so that the negative electrode current collector of the negative electrode sheet is connected with the casing 10, thereby causing the casing 10 to have a situation of corrosion of the primary battery, and further causing the leakage of the battery cell 100. In this embodiment, the supporting plate 70 is disposed between the first film region 61 and the housing 10, and the supporting plate 70 can well block the communication between the through hole 611 and the housing 10, so as to well reduce the probability of corrosion of the primary battery of the housing 10, and greatly reduce the risk of corrosion and leakage of the housing 10 in the battery cell 100.

It will be appreciated that, in order to reduce the damage of the case 10 caused by the stress concentration during the processing and manufacturing of the case 10, the corner position of the case 10 is usually processed into a rounded corner, the size of the accommodating cavity in the area of the rounded corner is gradually narrowed toward the bottom wall, in this embodiment, the supporting plate 70 is disposed between the insulating film 60 and the case 10, that is, the supporting plate 70 is disposed between the electrode assembly 50 and the bottom wall of the case 10, so that the area of the accommodating cavity in the rounded corner can be filled, thereby the electrode assembly 50 can be stably and well assembled in the accommodating cavity, the risk of wrinkling and bending due to the interference of the rounded corner structure of the electrode assembly 50 and the case 10 is reduced, and the probability of short circuit of the battery cell 100 is further reduced.

According to the battery cell 100 of the embodiment of the utility model, the insulating film 60 is arranged to cover the electrode assembly 50, the first film region 61 of the insulating film 60 is provided with the plurality of through holes 611, the supporting plate 70 is arranged between the first film region 61 and the inner wall of the shell 10 and does not have a channel structure communicated with two sides, so that the situations of internal short circuit of the battery cell 100 and corrosion and leakage of the shell 10 can be well reduced, and the risk of short circuit failure of the battery cell 100 is greatly reduced.

In some embodiments of the present utility model, as shown with reference to fig. 3, the projection of the plurality of through holes 611 may be located within the projection of the pallet 70 in the horizontal projection plane.

The projections of the plurality of through holes 611 on the horizontal projection plane are all located within the projection range of the supporting plate 70 on the horizontal projection plane, specifically, the electrolyte or the dropped carbon powder at the electrode assembly 50 flows out of the through holes 611 to the outside of the insulating film 60 and then falls down on the supporting plate 70, and the electrolyte and the carbon powder flow around along the plate surface of the supporting plate 70.

In this embodiment, the projection of the plurality of through holes 611 is set to be located in the projection of the supporting plate 70, so that the supporting plate 70 can reliably isolate the through holes 611 from the housing 10, and the channel structure of direct communication between the through holes 611 and the housing 10 is eliminated, so that the situation that the housing 10 is corroded and leaked can be well reduced under the condition that the electrode assembly 50 has good exhaust, and the risk of short-circuit failure of the battery cell 100 is greatly reduced.

In some embodiments of the present utility model, as shown in fig. 3 and 4, the pallet 70 may be a non-porous pallet.

The non-porous support plate in this embodiment means that the support plate 70 does not have a through hole structure penetrating through the upper and lower sides, and specifically, the support plate 70 is not provided with a through hole structure capable of directly communicating the through hole 611 with the housing 10.

In this embodiment, the supporting plate 70 is set to be a non-porous supporting plate, which is simple in structure and convenient to manufacture, and the supporting plate 70 can have good structural strength, so that the supporting plate 70 can well play a role in supporting and elevating the electrode assembly 50, and meanwhile, the probability that the through hole 611 of the first membrane area 61 is directly communicated with the casing 10 can be stably and reliably reduced, the risk of short circuit failure of the battery cell 100 in the formation process is further reduced, and the yield of the battery cell 100 can be improved to a certain extent.

In some embodiments of the present utility model, referring to fig. 10 to 12, the pallet 70 may include a pallet body 71 and a blocking piece 72, the pallet body 71 being formed with a first positioning hole 701 penetrating the pallet body 71 in an up-down direction, the blocking piece 72 being provided at one side of the pallet body 71 and covering the first positioning hole 701.

The shape of the supporting plate body 71 can be matched with the shape of the bottom wall of the accommodating cavity or the electrode assembly 50, the thickness of the supporting plate body 71 can be reasonably set according to actual needs, the number of the first positioning holes 701 can be multiple, for example, two, three, four and the like, the size of the first positioning holes 701 can be reasonably valued according to positioning needs, the arrangement of the first positioning holes 701 on the supporting plate body 71 can be designed according to positioning needs, the first positioning holes 701 can be opposite to the through holes 611 in the up-down direction, and the first positioning holes 701 can be staggered with the through holes 611 in the up-down direction. The first positioning holes 701 may be round holes, square holes, waist-shaped holes, irregular holes, etc., and the shapes of the first positioning holes 701 may be set as required, and when the first positioning holes 701 have a plurality of first positioning holes 701, the shapes of the plurality of first positioning holes 701 may be the same or different.

The blocking member 72 is provided at a side of the pallet body 71, and in particular, the blocking member 72 may be provided at a side of the pallet body 71 facing away from the insulating film 60. The blocking member 72 may be a gummed paper, which may be made of polypropylene, polyester resin, or the like. When the blocking member 72 blocks the first positioning hole 701, the blocking member 72 may cover a surface of a side of the pallet body 71 facing away from the insulating film 60, and further, both ends of the blocking member 72 may continue to extend upward between the sidewall of the housing 10 and the insulating film 60 to improve the blocking effect.

When the support plate 70 is assembled with the electrode assembly 50 and the insulating film 60 in the case 10, the support plate 70 may be assembled into the receiving chamber together with the insulating film 60 through the first positioning holes 701 after being positioned and assembled, specifically, the insulating film 60 may be provided with corresponding positioning holes, and the support plate 70 and the insulating film 60 may be inserted into the first positioning holes 701 of the support plate 70 through the positioning holes 701 of the insulating film 60 by positioning pins and penetrate the positioning holes of the insulating film 60 to position the support plate 70 onto the insulating film 60. The pallet 70 and the insulating film 60 may be connected by means of heat fusion after being positioned.

In this embodiment, the supporting plate 70 is set to the supporting plate body 71 and the plugging member 72, and the first positioning hole 701 is set on the supporting plate body 71, so that the assembling and positioning of the supporting plate 70 and the insulating film 60 are convenient and easy under the condition that the through hole 611 and the casing 10 are well separated, the battery cell 100 is assembled conveniently and easily, and the plugging member 72 can separate the first positioning hole 701 from the casing 10, so that the probability that the casing 10 and the electrode assembly 50 are directly communicated through the first positioning hole 701 is further reduced, and the risk of short-circuit failure of the battery cell 100 is further reduced.

In some embodiments of the present utility model, as shown in fig. 10, a first positioning hole 701 may be formed on the pallet 70, a second positioning hole 601 may be formed on the insulating film 60, and the projection of the first positioning hole 701 coincides with the projection of the second positioning hole 601 in a horizontal projection plane (a plane perpendicular to the up-down direction) and is spaced apart from the projection of the through hole 611.

The projections of the first positioning hole 701 and the second positioning hole 601 in the horizontal projection plane coincide, and the positioning pin or the like can pass through the first positioning hole 701 and the second positioning hole 601 to position the supporting plate 70 and the insulating film 60. The projections of the first positioning holes 701 are arranged at intervals from the projections of the through holes 611, that is, the first positioning holes 701 on the pallet 70 are arranged staggered from the through holes 611 in the up-down direction. The electrolyte at the electrode assembly 50 flows out of the through holes 611 to the outside of the insulating film 60 and then flows to the plate surface of the support plate 70, and then flows around along the plate surface, and part of the electrolyte flows from the first positioning holes 701 to the inner wall of the case 10.

In this embodiment, the first positioning holes 701 are arranged in a staggered manner with respect to the through holes 611, so that communication between the through holes 611 and the housing 10 through the first positioning holes 701 can be well avoided, and thus, the situation that the housing 10 is corroded and leaked is reduced, and the risk of short circuit failure of the battery cell 100 is well reduced.

In some embodiments of the present utility model, referring to fig. 10, the thickness of the pallet 70 in the up-down direction may be 0.1mm-1.5mm.

For example, the thickness of the pallet 70 in the up-down direction may be 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, or the like.

The thickness of the support plate 70 is limited to between 0.1mm and 0.15mm, so that the support plate 70 has enough thickness to lift the electrode assembly 50, the electrode assembly 50 can be stably and well assembled in the accommodating cavity, the space occupation of the support plate 70 in the accommodating cavity is small, and the battery cell 100 can maintain good energy density.

In some embodiments of the present utility model, referring to fig. 10, the ratio of the total area of the plurality of through holes 611 to the area of the first film region 61 may be 1/4-2/3.

For example, the ratio of the total area of the plurality of through holes 611 to the area of the first film region 61 may be 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, and so on.

In this embodiment, the ratio of the total area of the plurality of through holes 611 to the area of the first membrane region 61 is limited to 1/4 to 2/3, so that the plurality of through holes 611 on the first membrane region 61 have a sufficient total area to meet the exhaust requirement, so that the exhaust at the electrode assembly 50 is smoother, the short circuit condition is reduced, the first membrane region 61 has a good insulation separation effect and connection strength, the support plate 70 and the first membrane region 61 cooperate to well separate the direct communication between the through holes 611 and the casing 10, the support plate 70 and the first membrane region 61 can be connected and assembled more stably, and the overall structure of the insulating film 60 is more stable, so that the electrode assembly 50 can be well covered.

In one embodiment of the present utility model, referring to fig. 10, the ratio of the total area of the plurality of through holes 611 to the area of the first film region 61 may be 1/3 to 1/2.

For example, the ratio of the total area of the plurality of through holes 611 to the area of the first film region 61 may be 0.35, 0.4, 0.45, 0.5, and so on.

The ratio of the total area of the plurality of through holes 611 to the area of the first membrane region 61 is further limited to 1/3 to 1/2 in the present embodiment, so that the battery cell 100 can be stably and smoothly exhausted during the formation process, and the insulating film 60 and the supporting plate 70 can be well matched and assembled into the accommodating cavity and perform cladding insulation on the electrode assembly 50.

In some embodiments of the present utility model, as shown in fig. 3, the insulating film 60 may cover at least the bottom surface and the circumferential surface of the electrode assembly 50.

The insulating film 60 covers at least the bottom surface and the peripheral surface of the electrode assembly 50, that is, the insulating film 60 may cover only the bottom surface and the peripheral surface of the electrode assembly 50, and the insulating film 60 may cover all of the bottom surface, the peripheral surface, and the top surface of the electrode assembly 50.

In this embodiment, the insulating film 60 is disposed to cover at least the bottom surface and the peripheral surface of the electrode assembly 50, so that a stable and good insulating effect can be achieved between the peripheral surface of the electrode assembly 50 and the peripheral wall of the accommodating cavity and between the bottom surface of the electrode assembly 50 and the bottom wall of the accommodating cavity, so that the probability of short circuit of the battery cell 100 is greatly reduced, and the insulating film 60 has a simple structure and is convenient to assemble.

In some embodiments of the present utility model, as shown in fig. 3, the battery cell 100 may further include: the top cap assembly 20, the top of the case 10 is opened to form an opening, and the top cap assembly 20 is coupled to the case 10 and covers the opening.

Cover plate, electrode terminal, upper plastic part, lower plastic part, pressure relief hole, liquid injection hole and other structures can be arranged in the top cover assembly 20 to meet the operation and assembly requirements of the battery cell 100, the top of the shell 10 is opened to form an opening, when the battery cell 100 is assembled, the insulating film 60 and the electrode assembly 50 are assembled outside the shell 10 and then are positioned and assembled with the supporting plate 70, the insulating film 60, the electrode assembly 50 and the supporting plate 70 are arranged in the accommodating cavity from the opening, and the top cover assembly 20 covers the opening, so that the assembly of the battery cell 100 is completed.

In this embodiment, an opening is formed at the top of the case 10, so that the assembly of the electrode assembly 50, the insulating film 60 and other components in the battery cell 100 with the case 10 can be facilitated, the cap assembly 20 is provided to cover the opening, and the cap assembly 20 can be matched with the case 10 to form a sealed accommodating cavity structure, so that the electrode assembly 50 and the like can have a good operating environment.

In one embodiment of the present utility model, as shown in fig. 3, the top cap assembly 20 may further include: and a protection sheet 40, the protection sheet 40 being disposed at a side of the cap assembly 20 facing away from the electrode assembly 50.

The protective sheet 40 may be an insulating sheet, and the protective sheet 40 may be made of polypropylene, polyethylene, or the like having an insulating effect. The protection sheet 40 may cover a surface of the top cap assembly 20 facing away from the electrode assembly 50, and in particular, a side of the top cap assembly 20 facing away from the electrode assembly 50 protrudes with the electrode post 21 and is formed with a pressure relief hole structure, and the protection sheet 40 may cover a surface of the top cap assembly 20 facing away from the electrode assembly 50, excluding the electrode post 21 and the pressure relief hole.

In this embodiment, the protection sheet 40 is covered on the side of the top cover assembly 20 facing away from the electrode assembly 50, and the protection sheet 40 can perform a good insulation function, so as to reduce the short circuit condition of the contact between the casing 10 and the electrical connector, and make the battery cell 100 smoother in electrical connection. The protection sheet 40 may also play a role in preventing scratch, so that the structure of the plurality of battery cells 100 is more stable and intact in the processes of transportation, assembly, etc., and damage to the case 10 is reduced.

In one embodiment of the present utility model, as shown in fig. 3 and 6, the electrode assembly 50 may include one or more electrical cells connected to the post 21 of the cap assembly 20 through the switching tab 30.

The electrode assembly 50 includes one or more battery cells, and when the electrode assembly 50 has a plurality of battery cells, for example, the electrode assembly 50 may include two, three, four, etc., the plurality of battery cells may be stacked, and the insulating film 60 may cover the plurality of battery cells together. Specifically, the battery core has a plurality of positive electrode tabs and a plurality of negative electrode tabs, the plurality of positive electrode tabs are led out from the positive electrode sheet, the plurality of negative electrode tabs are led out from the negative electrode sheet, the adapter sheet 30 connects the plurality of positive electrode tabs on the plurality of battery cores with one electrode post 21 in the top cover assembly 20, the adapter sheet 30 connects the plurality of negative electrode tabs on the plurality of battery cores with the other electrode post 21 in the top cover assembly 20, the electrode post 21 connected with the positive electrode tabs forms a positive electrode post, and the electrode post 21 connected with the negative electrode tabs forms a negative electrode post. The switching piece 30 is a metal sheet, and the shape of the switching piece 30 can be reasonably set according to the connection requirement.

In this embodiment, the switching piece 30 is provided to connect the battery cell with the pole 21, so that the structure is simple, and the connection between the battery cell and the pole 21 is convenient and easy.

In one embodiment of the present utility model, as shown in fig. 3, the outer circumferential surface of the case 10 may be coated with a protective film 11.

The protective film 11 can be coated on the peripheral surface of the shell 10, the protective film 11 can be a blue film, the blue film is made of polyethylene terephthalate with good insulation effect, and the blue film has excellent physical and chemical properties, acid and alkali resistance, corrosion resistance, high pressure resistance and explosion resistance and flame retardance.

In this embodiment, the outer peripheral surface of the casing 10 is coated with the protective film 11, so that the probability of scraping and damaging the casing 10 during transportation or assembly of the battery cell 100 can be greatly reduced, the assembly and transportation of the battery cell 100 can be smoother, and the battery cell 100 can be more stably operated after assembly.

A battery 1000 according to an embodiment of the second aspect of the present utility model is described below with reference to fig. 2 to 12.

As shown in fig. 2 to 12, a battery 1000 according to an embodiment of the second aspect of the present utility model includes a battery cell 100 according to an embodiment of the first aspect of the present utility model.

Other constructions and operations of monomers according to embodiments of the present utility model are known to those of ordinary skill in the art and will not be described in detail herein.

According to the battery 1000 of the embodiment of the present utility model, by providing the battery cell 100 of the embodiment of the first aspect, providing the insulating film 60 to cover the electrode assembly 50, forming the plurality of through holes 611 in the first film region 61 of the insulating film 60, and providing the supporting plate 70 between the first film region 61 and the inner wall of the case 10 without a channel structure communicating two sides, the situations of internal short circuit of the battery cell 100 and corrosion leakage of the case 10 can be well reduced, and the risk of short circuit failure of the battery cell 100 is greatly reduced.

A powered device 10000 according to an embodiment of the third aspect of the present utility model is described below with reference to fig. 1-12.

As shown in fig. 1-12, a powered device 10000 according to an embodiment of the third aspect of the present utility model includes a battery 1000 according to an embodiment of the second aspect of the present utility model.

Other constructions and operations of the battery 1000 according to the embodiment of the present utility model are known to those of ordinary skill in the art, and will not be described in detail herein.

According to the electric device 10000 of the embodiment of the present utility model, by providing the battery 1000 of the second embodiment, providing the insulating film 60 to cover the electrode assembly 50, forming the plurality of through holes 611 in the first film region 61 of the insulating film 60, and providing the supporting plate 70 between the first film region 61 and the inner wall of the housing 10 without a channel structure communicating two sides, the situations that the battery cell 100 is shorted internally and the housing 10 corrodes and leaks can be well reduced, and the risk of shorting failure of the battery cell 100 is greatly reduced.

A powered device 10000 according to a specific embodiment of the present utility model will be described below with reference to fig. 1-12.

As shown in fig. 1, the electric device 10000 is a vehicle, the vehicle includes a motor 3000, a controller 2000 and a battery 1000, the controller 2000 is electrically connected with the motor 3000 and the battery 1000, the battery 1000 provides driving force for the motor 3000, and the battery 1000 may include a plurality of battery cells 100.

As shown in fig. 2 to 12, the battery cell 100 includes a case 10, a top cap assembly 20, a protection sheet 40, a transfer sheet 30, an electrode assembly 50, an insulating film 60, and a support plate 70. The outer peripheral surface of the shell 10 is coated with a protective film 11, the protective film 11 is a blue film, an opening is formed at the top of the shell 10, the top cover assembly 20 is covered at the opening and matched with the shell 10 to form a closed accommodating cavity space, a protective sheet 40 is arranged on the surface of one side of the top cover assembly 20, which is far away from the accommodating cavity, and the top cover assembly 20 is provided with two polar posts 21; the switching tab 30 is disposed in the receiving chamber and between the electrode assembly 50 and the cap assembly 20; the electrode assembly 50 includes two stacked electrical cells connected to the pole 21 by the tab 30.

The insulating film 60 is coated on the peripheral surface and the bottom surface of the electrode assembly 50, the bottom surface of the insulating film 60 is formed into a first film region 61, a plurality of through holes 611 are formed in the first film region 61, the plurality of through holes 611 are arrayed on the first film region 61, the through holes 611 penetrate through the two sides of the thickness of the insulating film 60, and two first positioning holes 701 which are arranged at intervals left and right (left and right sides as shown in fig. 10) are formed in the first film region 61 outside the plurality of through holes 611; the support plate 70 comprises a support plate body 71 and a blocking piece 72, the blocking piece 72 is made of gummed paper, the gummed paper is arranged on one side surface of the support plate body 71, which is far away from the first film region 61, and is used for blocking a first positioning hole 701 on the support plate body 71, the first positioning hole 701 on the support plate body 71 is opposite to the first positioning hole 701 on the first film region 61 vertically, and other through hole structures are not arranged on the support plate body 71 except the first positioning hole 701.

In this embodiment, the case 10 is an aluminum case, the gummed paper may be made of polypropylene, the insulating film 60 is made of polypropylene, and the insulating film 60 wraps the electrode assembly 50 in a turnover manner. Referring to fig. 9, the insulating film 60 is folded up from the peripheral edge of the first film region 61 to cover the peripheral side of the electrode assembly 50 and is folded over and adhered at a smaller side to form a case structure.

In this embodiment, the insulating film 60 is disposed to cover the electrode assembly 50, the first film region 61 of the insulating film 60 forms a plurality of through holes 611, and the supporting plate 70 is disposed between the first film region 61 and the inner wall of the housing 10 and is not formed with a channel structure for communicating two sides, so that the situations of internal short circuit of the battery cell 100 and corrosion and leakage of the housing 10 can be well reduced, and the risk of short circuit failure of the battery cell 100 is greatly reduced.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solution of the present utility model, and not limiting thereof; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present utility model is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (14)

1. A battery cell, comprising:

a housing (10), the housing (10) having a receiving cavity;

An electrode assembly (50), the electrode assembly (50) being disposed within the receiving chamber;

An insulating film (60), wherein the insulating film (60) covers the electrode assembly (50), the insulating film (60) is provided with a first film region (61) covering the bottom wall of the electrode assembly (50), the first film region (61) is provided with a plurality of through holes (611) which are arranged at intervals, and the through holes (611) penetrate through the first film region (61) along the up-down direction;

The support plate (70), the support plate (70) is arranged between the first membrane area (61) and the inner wall of the shell (10), and the support plate (70) is free of a channel structure which is communicated with the space on the upper side and the lower side of the support plate (70).

2. The battery cell according to claim 1, characterized in that in a horizontal projection plane, the projections of a plurality of the through holes (611) are located in the projection of the pallet (70).

3. The battery cell of claim 1, wherein the tray (70) is a non-porous tray.

4. The battery cell according to claim 1, wherein the pallet (70) includes a pallet body (71) and a blocking member (72), a first positioning hole (701) penetrating the pallet body (71) in the up-down direction is formed in the pallet body (71), and the blocking member is provided at one side of the pallet body (71) and covers the first positioning hole (701).

5. The battery cell according to claim 1, wherein a first positioning hole (701) is formed in the support plate (70), a second positioning hole (601) is formed in the insulating film (60), and the projection of the first positioning hole (701) coincides with the projection of the second positioning hole (601) in a horizontal projection plane and is arranged at a distance from the projection of the through hole (611).

6. The battery cell according to claim 1, wherein the thickness of the pallet (70) in the up-down direction is 0.1mm to 1.5mm.

7. The battery cell according to claim 1, characterized in that the ratio of the total area of the plurality of through holes (611) to the area of the first membrane region (61) is 1/4-2/3.

8. The battery cell according to claim 7, wherein a ratio of a total area of the plurality of through holes (611) to an area of the first film region (61) is 1/3 to 1/2.

9. The battery cell according to claim 1, wherein the insulating film (60) covers at least the bottom surface and the peripheral surface of the electrode assembly (50).

10. The battery cell of claim 1, further comprising: and a top cover assembly (20) in which the top of the housing (10) is opened to form an opening, and the top cover assembly (20) is connected with the housing (10) and covers the opening.

11. The battery cell of claim 10, further comprising: and a protection sheet (40), wherein the protection sheet (40) is arranged on one side of the top cover assembly (20) away from the electrode assembly (50).

12. The battery cell of claim 10, wherein the electrode assembly (50) comprises one or more electrical cells connected to the post (21) of the cap assembly (20) by a tab (30).

13. A battery comprising the battery cell of any one of claims 1-12.

14. A powered device comprising a battery according to claim 13.