CN116073092A - Battery cell, battery module and electrical device - Google Patents

Abstract

The invention provides a battery cell, a battery module and an electricity utilization device, and relates to the technical field of battery cells. The battery cell includes including casing, electrode assembly, top cap and insulating support spare, be provided with in the casing and hold the chamber, electrode assembly assembles in holding the intracavity, the top cap assembly is on the casing to with electrode assembly in holding the intracavity, the top cap includes the base plate and wears to establish the utmost point post subassembly on the base plate, utmost point post subassembly includes utmost point ear connecting portion, one side of electrode assembly orientation top cap is provided with the utmost point ear, utmost point ear connection is in utmost point ear connecting portion, insulating support spare sets up between top cap and electrode assembly, insulating support spare supports and leans on the electrode assembly beyond the utmost point ear. The insulating support piece is propped against the electrode assembly outside the electrode lug, when the battery cell is inverted, the electrode assembly arranged in the housing accommodating cavity is subjected to gravity, and the insulating support piece is propped against the electrode assembly, so that the electrode lug is prevented from being acted by the electrode assembly, and the problem that the electrode lug is inserted into the electrode assembly is prevented.

Description

Battery cell, battery module and electrical device

technical field

The invention relates to the technical field of battery cells, in particular to a battery cell, a battery module and an electrical device.

Background technique

Because of its high energy density, stable and reliable electrochemical energy storage capacity, relatively low cost, and mature technology, lithium-ion batteries are widely used in 3C, energy storage, electric vehicles and other fields, especially in the automotive field. Electric vehicles are becoming more and more popular in the market due to their low carbon emissions and brand-new driving experience. However, the low cruising range has always troubled people. In recent years, the subtraction of the structure of the power battery pack has significantly improved the specific energy of the battery pack. The industry has begun to integrate high-voltage connection lines, thermal runaway exhaust channels, etc. to improve volume utilization. Thermal runaway exhaust channels are usually set under the cells. For this purpose, the existing cell poles need to be turned downwards. The battery is inverted to improve the space utilization of the battery pack. However, when the existing battery cells are turned upside down, the tabs are easily inserted into the main body of the electrode assembly, resulting in a short circuit problem.

Contents of the invention

In view of the above shortcomings of the prior art, the present invention provides a battery cell, a battery module and an electrical device to improve the problem that when the existing battery cells are installed upside down, the tabs are easily inserted into the main body of the electrode assembly, resulting in a short circuit of the battery cells. technical problem.

To achieve the above purpose and other related purposes, the present invention provides a battery cell. The battery core includes a casing, an electrode assembly, a top cover and an insulating support. A housing cavity is provided in the casing, the electrode assembly is assembled in the storage cavity, and the top cover is assembled on the casing to assemble the electrode assembly in the storage cavity. The cover includes a base plate and a pole assembly pierced on the base plate. The pole assembly includes a tab connection part. The side of the electrode assembly facing the top cover is provided with a tab, the tab is connected to the tab connection part, and the insulating support is arranged on Between the top cover and the electrode assembly, the insulating support is against the electrode assembly other than the tab.

In an exemplary embodiment of the present application, the insulating support includes a first support plate and an extension portion, the first support plate abuts against the substrate, and the extension portion extends from the first support plate to the electrode assembly.

In an exemplary embodiment of the present application, the extension part is provided with a lightening hole.

In an exemplary embodiment of the present application, after the top cover and the casing are assembled, the height of the insulating support is compressed by 1-3 mm.

In an exemplary embodiment of the present application, the material of the insulating support includes one or more of PPS, PSU, PC, PFA, PBT, PA, and PP materials; the material of the insulating support also includes fillers, and the fillers include inorganic oxide thing.

In an exemplary embodiment of the present application, a liquid storage bin is arranged on the top cover, and the liquid storage bin protrudes from a side away from the electrode assembly.

In an exemplary embodiment of the present application, the electrode assembly is covered with an insulating film, and a liquid absorbing structure is arranged on the insulating film. One end of the liquid absorbing structure is inserted into the liquid storage bin, and the other end is connected to the insulating film, so that the liquid in the liquid storage bin The electrolyte is drained to the insulating film.

In an exemplary embodiment of the present application, the liquid absorbing structure includes a connection piece and a contact piece, the contact piece protrudes into the liquid storage chamber, and the connection piece connects the contact piece and the insulating film.

In an exemplary embodiment of the present application, both the connecting element and the contact element are braided.

In an exemplary embodiment of the present application, the insulating film includes a base film and a particle layer attached to the base film.

In an exemplary embodiment of the present application, the material of the base film is any one of PMMA, PE, PP, and PET, and the particle layer is PMMA particles attached to the base film.

The present application also provides a battery module, the battery module includes a casing, the battery module further includes any one of the battery cells described above, and a plurality of battery cells are assembled in the casing.

The present application also provides an electric device, on which any battery cell described above is installed, and the battery cell is used to provide electric energy.

In combination with prior art, the beneficial effects of the present invention are:

When the existing battery cells are turned upside down, the tabs are easily inserted into the electrode assembly, resulting in failures such as short circuit of the battery cells. In this application, an insulating support is provided between the base plate of the top cover and the electrode assembly, and the insulating support is against the electrode assembly other than the tab. When the battery core is turned upside down, the electrode assembly placed in the housing cavity is subject to gravity. , the insulating support is against the electrode assembly, so as to prevent the tab from being subjected to the force of the electrode assembly and prevent the problem of the tab being inserted into the electrode assembly.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of an exemplary cell of the present application;

FIG. 2 is a schematic structural diagram of an exemplary cell structure of the present application;

FIG. 3 is a schematic diagram of an exemplary top cover structure of the present application;

Fig. 4 is an exemplary roof structure diagram of the present application;

FIG. 5 is a schematic structural diagram of an exemplary insulating support of the present application;

Figure 6 is a schematic diagram of an exemplary electrode assembly of the present application;

FIG. 7 is a schematic diagram of an insulating film structure of an example of the present application;

FIG. 8 is a schematic diagram of an exemplary insulating film liquid absorbing structure of the present application when it is not combined. .

Component designation description

100. Top cover; 101. Liquid storage bin; 102. Pole assembly; 103. Explosion-proof valve; 104. Liquid injection hole; 106. Base plate; 107. Insulating support; 1072. Second through hole; Hole; 200, shell; 300, battery core body; 310, electrode assembly; 311, main body; 312, tab; 320, insulating film; 322, liquid absorption structure; 3221, connector; 3222, contact.

Detailed ways

Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of the present invention is for describing specific implementations, not for limiting the protection scope of the present invention. The test methods for which specific conditions are not indicated in the following examples are usually in accordance with conventional conditions, or in accordance with the conditions suggested by each manufacturer.

When the examples give numerical ranges, it should be understood that, unless otherwise stated in the present invention, the two endpoints of each numerical range and any value between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present invention are consistent with those skilled in the art's grasp of the prior art and the description of the present invention, and can also be used with the methods, equipment, and materials described in the embodiments of the present invention Any methods, apparatus and materials of the prior art similar or equivalent to the practice of the present invention.

It should be noted that terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable scope of the invention and the change or adjustment of its relative relationship shall also be regarded as the practicable scope of the present invention without any substantial change in the technical content.

In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are for illustrative purposes only, and should not constitute any limitation to the application .

"Plurality" in this application refers to two or more (including two).

In order to improve the specific energy of the battery pack, the industry integrates high-voltage connection lines and thermal runaway exhaust channels to improve volume utilization. The cells are inverted to improve the space utilization of the battery pack. The existing battery tab 312 is arranged above the battery. If the battery is directly turned upside down, the tab 312 is easily inserted into the electrode assembly 310 , resulting in a short circuit inside the battery. In the industry, it is possible to electrically connect the tab 312 at one end of the cell to the pole assembly 102 at the other end of the cell by setting a longer current-collecting member, so that after the cell is inverted, the tab 312 is located at the top, avoiding The tab 312 is inserted into the electrode assembly 310 under force, but the longer current collecting member needs to penetrate the inside of the cell, which occupies a large space and affects the specific energy of the cell.

Please refer to FIG. 1 to FIG. 2 , the present application provides a battery cell to solve the above problems. The cell includes a casing 200 , a top cover 100 , an electrode assembly 310 and an insulating support 107 .

The housing 200 is a hollow structure with one side open, and an accommodating cavity for accommodating the electrode assembly 310 is formed inside. The casing 200 may be in various shapes, such as a cylinder, a cuboid, etc., and the shape of the casing 200 may be determined according to the specific shape of the electrode assembly 310 . For example, if the electrode assembly 310 has a cylindrical structure, the cylindrical shell 200 can be selected; if the electrode assembly 310 has a rectangular parallelepiped structure, the rectangular parallelepiped shell 200 can be selected.

The electrode assembly 310 includes a first pole piece, a second pole piece and a spacer, and the spacer is used to separate the first pole piece from the second pole piece. The polarity of the first pole piece and the second pole piece is opposite, in other words, one of the first pole piece and the second pole piece is a positive pole piece, and the other of the first pole piece and the second pole piece is a negative pole piece pole piece. The first pole piece, the second pole piece and the spacer are strip structures, and the first pole piece, the second pole piece and the spacer form a winding structure or a laminated structure. The wound structure or stacked structure may be a cylindrical structure, a flat structure or other shapes.

Please refer to FIG. 6 , the electrode assembly 310 is assembled into the housing cavity through the opening of the housing 200 , the electrode assembly 310 includes a main body 311 and two tabs 312 , the two tabs 312 protrude from the main body 311 , and the two poles One of the ears 312 is a positive polarity tab 312 , and the other is a negative polarity tab 312 . Exemplarily, the two tabs 312 protrude from the same side of the main body 311 , in other words, the positive and negative tabs 312 are disposed on the same side of the main body 311 ; Both sides of the main body part 311 protrude, that is, the positive and negative tabs 312 are respectively provided on both sides of the main body part 311 .

Referring to FIGS. 3-4 , the top cover 100 is assembled on the opening of the casing 200 , and the top cover 100 cooperates with the casing 200 to seal the electrode assembly 310 in the containing cavity and seal the electrolyte in the containing cavity. Exemplarily, the top cover 100 includes a base plate 106, a pole assembly 102, an explosion-proof valve 103 and a liquid injection hole 104. The pole assembly 102 is penetrated on the base plate 106. The pole assembly 102 is electrically connected to the positive and negative tabs 312 respectively. Exemplarily, the pole assembly 102 includes a tab connection part, and the tab 312 is connected to the tab connection part. Preferably, the tab 312 is connected to the tab part fixed connection.

The insulating support 107 is arranged between the top cover 100 and the electrode assembly 310. Exemplarily, one side of the insulating support 107 abuts against the electrode assembly 310 other than the tab 312, and the other side abuts against the top cover 100. on the substrate 106. When the battery core is turned upside down, the electrode assembly 310 is subjected to gravity, one side of the insulating support 107 is against the electrode assembly 310, and the other side is against the top cover 100, and the electrode assembly 310 is supported by the insulating support 107 , to reduce the stress on the tab 312, thereby preventing the tab 312 from being inserted into the electrode assembly 310, and preventing short circuit in the battery cell.

Exemplarily, the insulating support 107 is provided with a first through hole 1073, the first through hole 1073 can accommodate the tab 312 and/or the tab connecting part to pass through, exemplary, the tab 312 is inserted into the first through hole 1073 Inside, the tab connection part is also inserted into the first through hole 1073, the connection between the tab 312 and the tab connection part is located in the first through hole 1073, the first through hole 1073 and the tab 312, the tab connection part There is a gap, and there is also a gap at the connection between the first through hole 1073 and the tab 312 and the tab connection part. On the one hand, it is convenient for the connection between the tab 312 and the tab connection part. On the other hand, it can accommodate the electrolyte toward the electrode assembly 310. flow to infiltrate the electrode assembly 310 . In one embodiment, the tab 312 runs through the first through hole 1073, and the first through hole 1073 and the tab 312 are in clearance fit. On the one hand, it can facilitate the electrical connection between the tab 312 and the pole assembly 102; There is a gap between the side wall of the hole 1073 and the tab 312 , which can accommodate the flow of the electrolyte towards the electrode assembly 310 to infiltrate the electrode assembly 310 . In another embodiment, after the tab connection part passes through the first through hole 1073, it is connected to the tab 312, and the first through hole 1073 and the tab connection part are in clearance fit. For electrical connection, on the other hand, the first through hole 1073 can accommodate the flow of electrolyte towards the electrode assembly 310 to infiltrate the electrode assembly 310 .

Exemplarily, the insulating support 107 includes a first support plate and an extension portion, wherein the first support plate abuts against the base plate 106 of the top cover 100, and the extension portion extends from the side wall of the first support plate toward the direction of the electrode assembly 310, extending part abuts against the electrode assembly 310 . The extension part may be a frame-shaped structure arranged on the side wall of the first support plate, or may be a column-shaped structure or a strip-shaped structure arranged at the bottom of the first support plate. In one embodiment, the extension part is a frame-shaped structure arranged on the side wall of the first support plate, and the extension part is also provided with lightening holes. Next, the weight of the insulating support 107 is reduced.

Please refer to FIG. 5 , in one embodiment, the insulating support 107 is a frame structure, which can evenly bear the weight of the electrode assembly 310 while avoiding damage to the main body of the electrode assembly 310 . In one embodiment, the insulating support 107 is an elongated structure, including a first support plate, a second support plate and a support column, the support column is arranged between the first support plate and the second support plate, and the first support plate and the second support plate The opposite sides of the second support plate respectively abut against the electrode assembly 310 and the base plate 106 of the top cover 100, so that the force of the electrode assembly 310 on the insulating support 107 can be evenly distributed, ensuring that the supporting surface of the insulating support is supported. The force is uniform, and the weight of the insulating support 107 is reduced under the premise of ensuring the bearing capacity of the insulating support 107 by arranging the support column, and the overall weight of the battery cell is reduced. The supporting pillars are evenly supported between the first supporting plate and the second supporting plate, and a gap is formed between the supporting pillars. When the electrolyte soaks the cell, it is more convenient for the electrolyte to infiltrate toward the electrode assembly 310 .

Exemplarily, after the top cover 100 and the housing 200 are assembled, the height of the insulating support 107 is compressed by 1-3 mm, and the compression height can be selected from any value in the range of 1-3 mm, such as 1 mm, 2 mm, 3 mm, etc., and the insulating support 107 Compression is carried out during assembly, in other words, the top cover 100 and the casing 200 provide a pre-tightening force to the insulating support 107 to ensure that after the battery cell is inverted, the deformation of the insulating support 107 is reduced when it is subjected to the force of the electrode assembly 310, or even no Deformation, when the pre-tightening force is greater than or equal to the gravity of the electrode assembly 310, that is, when the pre-tightening force is greater than or equal to the force exerted by the inverted electrode assembly 310 on the insulating support 107, when the cell is inverted, the insulating support 107 does not change compression deformation, In other words, the force applied to the tab 312 does not change before and after the cell is inverted, thereby preventing the tab 312 from being inserted into the electrode assembly 310 . When the pretightening force is less than the gravity of the electrode assembly 310, after the cell is inverted, the insulating support 107 will produce a slight compression deformation. The difference is smaller, and the deformation or reverse insertion of the tab 312 is controllable, so as to prevent the tab 312 from being inserted into the electrode assembly 310 due to excessive compression and deformation of the insulating support 107 . Preferably, after the top cover 100 and the casing 200 are assembled, the pretightening force received by the insulating support 107 is greater than or equal to the gravity of the electrode assembly 310, so as to ensure that the force on the tab 312 does not change before and after the cell is inverted, thereby preventing the tab 312 from Inserted into the electrode assembly 310.

In one embodiment, the tab 312 is provided with a bent portion, which can be placed in the first through hole 1073 or at other positions of the tab 312. In the presence of inertia, the force exerted by the electrode assembly 310 on the insulating support 107 increases. When the insulating support 107 deforms greatly, the stress at the bending part is concentrated and deformation is more likely to occur, thereby shortening the vertical height of the tab 312 , reduce the stress on the tab 312 and prevent the tab 312 from being inserted into the electrode assembly 310 . Exemplarily, the bending part can be bent in an arc shape, or bent at an angle such as an acute angle or an obtuse angle. This application does not limit the bending method of the bending part, and the stress concentration of the bending part is satisfied when the force is applied. Easy to deform.

Exemplarily, the material of the insulating support 107 includes PPS (polyphenylene sulfide), PSU (polysulfone material), PC (polycarbonate material), PFA (perfluoropropyl perfluorovinyl ether-polytetrafluoroethylene material), PBT (polybutylene terephthalate material), PA (nylon material) and PP (polypropylene material). The material of the insulating support 107 can be any of the above-mentioned individual materials, such as PPS, PA, PP, etc., or a combination of any two or more of the above-mentioned materials, such as a combination of PA and PP, a combination of PPS and PSU, The combination of PC, PFA and PBT, etc.

Exemplarily, the material of the insulating support 107 also includes fillers, the fillers include inorganic oxides, and the inorganic oxides are one or more combinations of alumina, silicon dioxide and silicon nitride, and the fillers can be any of the above-mentioned A single material can also be any combination of two or three, such as a combination of alumina and silicon dioxide, a combination of aluminum oxide and silicon nitride, a combination of aluminum oxide, silicon dioxide and silicon nitride combination etc. By filling the insulating support 107 with inorganic oxide, the strength of the insulating support 107 can be improved to ensure the supporting effect.

When the cell is turned upside down, the electrolyte drips from the electrode assembly 310 to the bottom of the cell. Most of the electrolyte on it will soak the explosion-proof valve 103, and the long-term immersion of the explosion-proof valve 103 in the electrolyte will accelerate aging, reduce the service life of the explosion-proof valve 103, and even cause the explosion-proof valve 103 to fail, affecting the use safety of the battery. Referring to FIG. 4 , for example, a liquid storage bin 101 is disposed on the top cover 100 , the liquid storage bin 101 protrudes away from the side of the electrode assembly 310 , and the liquid storage bin 101 forms a concave in the cell. When the electrolyte drops onto the top cover 100, due to the concave structure of the liquid storage bin 101, the electrolyte will flow into the liquid storage bin 101, thereby preventing the electrolyte from soaking the explosion-proof valve 103 and preventing the explosion-proof valve 103 from being soaked in the electrolyte. When the problem of accelerated aging occurs, improve the durability of the inverted lithium-ion battery. In one embodiment, two liquid storage bins 101 are arranged symmetrically on both sides of the top cover 100 , which can effectively improve the efficiency of electrolyte flowing to the liquid storage bin 101 and prevent electrolyte accumulation.

Please refer to FIGS. 4-5 . Exemplarily, the explosion-proof valve 103 can be arranged at any position of the top cover 100, such as the end of the top cover 100, the central area of the top cover 100, etc. Preferably, the explosion-proof valve 103 is arranged on the top cover 100. In the central area of the cover 100, when the thermal runaway of the cell occurs, the explosion-proof valve 103 can more quickly play the role of exhaust and pressure relief. In one embodiment, the end surface of the explosion-proof valve 103 protrudes from the surface of the top cover 100 close to the electrode assembly 310. In other words, when the cell is inverted, the height of the top surface of the explosion-proof valve 103 is higher than the height of the top surface of the top cover 100 near the electrode assembly 310. Further Prevent the electrolyte from soaking the explosion-proof valve 103, ensure the service life of the explosion-proof valve 103, and improve the service life of the battery cell.

Exemplarily, a flow groove is provided on the side of the top cover 100 close to the electrode assembly 310 , and the flow groove communicates with the liquid storage bin 103 . By providing a liquid flow tank, the electrolyte dripped onto the top cover 100 can quickly flow into the liquid storage bin 103 , thereby preventing the electrolyte from accumulating on the top cover 100 and soaking the explosion-proof valve 103 . In one embodiment, the depth of the liquid flow tank increases toward the liquid storage bin 103 , which facilitates the electrolyte in the liquid flow tank to flow into the liquid storage bin 103 .

Exemplarily, the electrode assembly 310 is coated with an insulating film 320, and the electrode assembly 310 is coated with the insulating film 320 to form the cell main body 300; on the one hand, the insulating film 320 can insulate the electrode assembly 310 from the housing 200, preventing the electrode assembly 310 from The shells 200 conduct electricity; on the other hand, the insulating film 320 coated on the electrode assembly 310 can protect the electrode assembly 310 and prevent the electrode assembly 310 from being scratched or damaged when it is assembled into the shell 200 through the opening.

Exemplarily, a liquid absorbing structure 322 is provided on the insulating film 320, one end of the liquid absorbing structure 322 is inserted into the liquid storage bin 101, and the other end is connected to the insulating film 320, so as to drain the electrolyte in the liquid storing bin 101 to the insulating film 320 and soak into the electrode assembly 310. Through the capillary action of the insulating film 320, the electrolyte that can drop into the liquid storage chamber 101 is drained onto the insulating film 320, and the insulating film 320 wraps the electrode assembly 310, and the electrolyte on the insulating film 320 infiltrates the electrode assembly 310, thereby Realize the balance between the electrolyte dripping to the top cover 100 and collecting into the liquid storage bin 101, and the liquid absorption structure 322 draining the electrolyte to the insulating film 320, solving the problem that the dripping electrolyte cannot be reabsorbed by the electrode assembly 310 , to ensure the stability of the electrolyte in the electrode assembly 310 .

Please refer to FIG. 8. Exemplarily, the liquid absorbing structure 322 includes a connecting piece 3221 and a contact piece 3222. The contact piece 3222 extends into the liquid storage bin 101. The contact piece 3222 absorbs the electrolyte in the liquid storage bin 101. The connecting piece 3221 The contacts 3222 and the insulating film 320 are connected. In one embodiment, the insulating support 107 is provided with a second through hole 1072, and the connecting member 3221 passes through the second through hole 1072 to connect with the insulating film 320, and the second through hole 1072 and the connecting member 3221 are in clearance fit to facilitate the passage of the electrolyte through the second through hole 1072. Two through holes 1072, when the electrolyte passes through the second through hole 1072, it will contact with the connector 3221, so as to further increase the contact area between the liquid absorbing structure 322 and the electrolyte, and improve the absorption efficiency of the electrolyte. The contact piece 3222 has a larger surface area, which can effectively improve the adsorption efficiency of the electrolyte.

Please refer to FIG. 7. Exemplarily, two liquid-absorbing structures 322 form a group. After the insulating film 320 covers the electrode assembly 310, the two liquid-absorbing structures 322 are respectively connected to two opposite large surfaces of the insulating film 320. The liquid-absorbing structure 322 is heat-fused and fixed together. The two liquid-absorbing structures 322 form a group, the hot-melted contact piece 3222 is inserted into the liquid storage chamber 101, the two connecting pieces 3221 are respectively connected to the two large surfaces of the insulating film 320, and the electrolyte is drained to the large surface of the insulating film 320. The surface is convenient for wetting the electrode assembly 310 .

Exemplarily, both the connecting element 3221 and the contact element 3222 are braided. The weaving structure can be plain weave, twill weave, etc., which can be selected according to actual needs, which is not limited in this application. By setting the connecting piece 3221 and the contact piece 3222 into a braided structure, the ability of absorbing and conducting liquid is enhanced, the electrolyte is more conveniently adsorbed, and the adsorption efficiency of the electrolyte in the liquid storage bin 101 is effectively improved.

In one embodiment, the insulating film 320 includes a base film and a particle layer attached to the base film. Exemplarily, the material of the base film is PMMA (polymethyl methacrylate), PE (polyethylene), PP (polypropylene) , PET (polyethylene terephthalate), and the particle layer is PMMA particles sprayed on the surface of the base film. By spraying the particle layer on the surface of the base film, the liquid-conducting ability of the insulating film 320 can be effectively enhanced, so that the electrolyte guided by the connector 3221 is evenly delivered to the surface of the electrode assembly 310, effectively improving the liquid-conducting efficiency.

The present application also provides a battery module. The battery module includes a casing. The battery module also includes any one of the above-mentioned cells. Several cells are assembled in the casing. The cells of the battery module can be connected in parallel or in series or mixed. The battery cells are connected in parallel, that is, the cells are connected in parallel and in series. For example, when the battery module is used, the cells are in an upside-down state.

The present application also provides an electric device, on which any one of the above-mentioned electric cores is installed, and the electric core is used to provide electric energy, and the electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft , electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles; spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.; electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric boat toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and more. The embodiments of the present application do not impose special limitations on the above-mentioned electrical devices.

The present invention provides a battery cell. By setting the insulating support 107, the insulating support 107 supports the electrode assembly 310, reduces the force on the tab 312, thereby preventing the tab 312 from being inserted into the electrode assembly 310, and preventing the occurrence of short circuit. By setting the liquid storage bin 101 on the top cover 100 , the liquid storage bin 101 collects the electrolyte dripped onto the top cover 100 , avoiding the electrolyte soaking the explosion-proof valve 103 and prolonging the service life of the explosion-proof valve 103 . By providing the liquid absorbing structure 322 , the liquid absorbing structure 322 guides the electrolyte in the liquid storage bin 101 to the insulating film 320 , which solves the problem that the electrolyte in the liquid storage bin 101 cannot be reabsorbed. Therefore, the present invention effectively overcomes some practical problems in the prior art and thus has high utilization value and use significance. The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims (13)

1. An electric core, characterized in that, comprising: a housing, the housing is provided with a receiving chamber; an electrode assembly, assembled in the accommodating cavity; a top cover, assembled on the housing to seal the accommodating cavity, the top cover includes a base plate and a pole assembly pierced on the base plate; an insulating support, disposed between the base plate and the electrode assembly, and the tab connection part of the pole assembly exposes the insulating support; Wherein, the side of the electrode assembly facing the top cover is provided with a tab, the tab is connected to the tab connection part, and the insulating support is against the electrode assembly other than the tab. superior. 2. The cell according to claim 1, wherein the insulating support comprises a first support plate and an extension, the first support plate abuts against the substrate, and the extension is formed by the The first support plate extends toward the electrode assembly. 3 . The battery cell according to claim 2 , wherein a weight reduction hole is provided on the extension portion. 4 . 4 . The battery cell according to claim 1 , wherein after the top cover is assembled with the housing, the height of the insulating support is compressed by 1-3 mm. 5. The electric core according to claim 1, wherein the material of the insulating support includes one or more of PPS, PSU, PC, PFA, PBT, PA and PP materials; the insulating support The material of the piece also includes fillers including inorganic oxides. 6 . The battery cell according to claim 1 , wherein a liquid storage bin is arranged on the top cover, and the liquid storage bin protrudes from a side away from the electrode assembly. 7. The battery cell according to claim 6, wherein the electrode assembly is coated with an insulating film, the insulating film is provided with a liquid absorbing structure, and one end of the liquid absorbing structure is inserted into the liquid storage bin The other end is connected to the insulating film, so as to drain the electrolyte in the liquid storage chamber to the insulating film. 8. The battery cell according to claim 7, wherein the liquid absorbing structure includes a connecting piece and a contact piece, the contact piece protrudes into the liquid storage chamber, and the connecting piece connects the contact piece pieces with the insulating film. 9 . The battery cell according to claim 8 , wherein both the connecting member and the contact member are braided. 10. The battery cell according to claim 7, wherein the insulating film comprises a base film and a particle layer attached to the base film. 11. The electric core according to claim 10, wherein the base film material is any one of PMMA, PE, PP, PET, and the particle layer is PMMA particles attached to the base film . 12. A battery module, the battery module includes a housing, characterized in that the battery module also includes the battery cell according to any one of claims 1-11, and several of the battery cells are assembled on the inside the enclosure. 13. An electric device, characterized in that the electric cell according to any one of claims 1-11 is installed on the electric device, and the electric cell is used to provide electric energy.

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