CN218215355U - Electrode assembly, battery cell, battery and electric device - Google Patents

Abstract

The application relates to an electrode assembly, a battery monomer, a battery and an electric device. The electrode assembly includes: the body is provided with a central hole in a penetrating manner along the axial direction of winding; and the supporting piece is positioned in the central hole and extends along the axial direction, the supporting piece comprises a plurality of supporting parts which are sequentially distributed and stacked along the axial direction, and an expansion gap which extends along the circumferential direction of the supporting piece is formed between at least two adjacent supporting parts in an enclosing manner. The application provides an electrode subassembly, battery monomer, battery and power consumption device can alleviate the pole piece and when sinking to the centre bore, still can alleviate the pole piece because of the problem of inflation fracture to help promoting electrode subassembly, battery monomer, battery and power consumption device's security.

Description

Electrode assembly, battery cell, battery and power consumption device

Technical Field

The present application relates to the field of battery technologies, and in particular, to an electrode assembly, a battery cell, a battery, and an electric device.

Background

Energy conservation and emission reduction are the key points of sustainable development of the automobile industry, and the electric vehicle becomes an important component of the sustainable development of the automobile industry due to the advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in its development.

The battery includes a battery cell including an electrode assembly, and in the case of a wound electrode assembly, in order to prevent pole pieces therein from collapsing into a central hole, a central tube is generally provided in the central hole. Due to the arrangement of the central tube, when the pole piece expands, the central hole cannot absorb the expanded volume of the pole piece, so that the pole piece is cracked, and the safety of the battery is reduced.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application provides an electrode assembly, a battery cell, a battery and an electric device,

when can alleviating the pole piece and collapsing to the centre bore, still can alleviate the pole piece because of the problem of inflation fracture to help promoting electrode subassembly, battery monomer, battery and power consumption device's security.

In a first aspect, the present application provides an electrode assembly comprising:

the body is provided with a central hole in a penetrating manner along the axial direction of winding; and

the support piece is located the centre bore to along axial extension, support piece include along the axial lay in proper order and a plurality of supporting parts that pile up, enclose between two at least adjacent supporting parts and establish the bloated clearance that forms along support piece's circumference extension.

The support piece is positioned in the central hole and extends along the axial direction, so that the support piece can support the body to prevent the pole piece from collapsing into the central hole; furthermore, at least two adjacent supporting parts are surrounded to form an expansion gap extending along the circumferential direction of the supporting part, and when the pole piece expands, the expansion gap can absorb at least part of the expanded volume so as to reduce the possibility of cracking of the pole piece, so that the single battery and the battery have better safety.

In one embodiment, an inflation gap is defined between every two adjacent supporting portions.

In this embodiment, when the pole piece expands at the easily expandable position corresponding to the plurality of expansion gaps one to one, each expansion gap can absorb the expansion volume at the corresponding easily expandable position, thereby helping to further reduce the risk of pole piece cracking, and enabling the battery cell and the battery to have better safety.

In one embodiment, in the axial direction, each support part has a first end part and a second end part which are arranged along the axial direction;

the width of the first end portion in the radial direction of the central hole is gradually reduced in the direction opposite to the second end portion; and/or the width of the second end portion in the radial direction of the central hole is gradually reduced in the direction opposite to the first end portion.

The width of the first end part in the radial direction of the central hole is gradually reduced by arranging the first end part in the direction back to the second end part, so that the supporting part is conveniently placed into the central hole; and the second end part is arranged in the direction back to the first end part, and the width of the second end part in the radial direction of the central hole is gradually reduced, so that the support part can be conveniently taken out and replaced.

In one embodiment, the support further comprises a receiving portion having a receiving cavity extending along the axial direction, and each support portion is received in the receiving cavity and abuts against the cavity wall of the receiving cavity.

Through setting up the portion of accomodating, then the combination forms all supporting parts of support piece and can form a whole to conveniently with support piece rapid Assembly in the centre bore.

In one embodiment, the receiving portion is a film member.

Then when the pole piece takes place the inflation and extrudees the portion of accomodating, the portion of accomodating can be sunken to in the imbibition clearance under the effect of inflation power to make the imbibition clearance can absorb the expanded volume of pole piece. Because the thin film component is thin, the volume occupied by the accommodating part in the expansion gap is small, and therefore the expansion gap has a good expansion effect. In addition, the film component has better elasticity, is not easy to damage even if deformed under the action of the expansion force in time, and has longer service life.

In one embodiment, in the radial direction of the central hole, the gap between the outer wall of the support member and the hole wall of the central hole is L, and L satisfies the condition: l is more than or equal to 3mm and less than or equal to 5mm.

Under this kind of clearance, both can satisfy support piece's support demand, can avoid the pole piece to sink in to the centre bore, moreover, at support piece stretch into and stretch out the in-process of centre bore, still can prevent support piece and the pore wall of centre bore hard contact and with the pore wall extrusion of centre bore and cause the body damage.

In one embodiment, the supporting portion is a spherical structure.

Generally, the spherical structure has a relatively smooth surface, so that in the process of putting the supporting portion into the central hole, the abrasion between the supporting portion and the hole wall of the central hole can be reduced, and the body can be further prevented from being damaged.

In one embodiment, the supporting portion is provided with a liquid storage through hole for storing electrolyte.

The liquid storage through hole has liquid retention capacity. Through setting up the stock solution through-hole, the stock solution through-hole can store partial electrolyte, and this partial electrolyte can flow out and supply to the centre bore and fully soak the pole piece near the centre bore after battery monomer rotates certain angle to help promoting battery monomer's energy density.

In one embodiment, the supporting member further comprises a propping-open portion, and at least one propping-open portion is arranged between at least two adjacent supporting portions.

Through setting up the portion of strutting, can be connected two supporting parts that press from both sides and establish it and form a whole to help promoting support piece's wholeness, the assembly of being convenient for. In addition, the distance between the two supporting parts which are clamped by the opening part can be enlarged due to the arrangement of the opening part, so that the expansion gap formed between the two supporting parts has a larger size in the axial direction of the body. In this way, the swelling gap can absorb a larger swelling volume, thereby contributing to further improvement of the safety of the battery cell.

In a second aspect, the present application also provides a battery cell including an electrode assembly as described in any one of the above embodiments.

In a third aspect, the present application also provides a battery, which includes the battery cell as described in the above embodiments.

In a fourth aspect, the present application further provides an electric device, which includes the battery according to the above embodiment, wherein the battery is used for supplying electric energy to the electric device.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a schematic view of a vehicle according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a battery according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a battery cell according to an embodiment of the present application;

FIG. 4 is a schematic view of a support member and a center hole of an embodiment of the present application;

fig. 5 is a schematic structural diagram of a supporting member according to another embodiment of the present application.

Reference numerals:

1000. a vehicle; 100. a battery; 200. a controller; 300. a motor; 10. a box body; 11. a first portion; 12. a second portion; 20. a battery cell; 21. a housing; 22. end caps, 23, an electrode assembly; 231. a body; 2311. a central bore; 2313. a positive electrode tab; 2315. a negative electrode tab; 232. a support member; 2321. a support portion; 2322. a suction expansion gap; 2323. a first end portion; 2324. a second end portion; 2325. a liquid storage through hole; 2326. a spreader portion.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial X," "radial Y," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

At present, the application of the battery is more and more extensive from the development of market situation. The 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 and electric automobiles, and a plurality of fields such as military equipment and aerospace. As the field of application of batteries is continuously expanded, the market demand thereof is also continuously expanded.

The battery comprises a single battery body, an electrode assembly is arranged in the single battery body, a winding type electrode assembly is arranged in the single battery body, and a central hole penetrates through the winding type electrode assembly along the axial direction of winding. In the conventional art, in order to prevent the pole pieces in the electrode assembly from collapsing into the central hole, a central tube is usually provided in the central hole. However, the inventor has noticed that, due to the arrangement of the central tube, when the pole piece expands, the central hole cannot absorb the volume of the expanded pole piece, so that the pole piece cracks, and the safety of the battery is reduced.

In order to alleviate the problem of pole piece cracking caused by the arrangement of the central tube, the applicant has conducted intensive research and has designed an electrode assembly, which includes a body and a support member, wherein the body is provided with a central hole in a penetrating manner along the axial direction of winding, the support member is located in the central hole and extends along the axial direction X, the support member includes a plurality of support portions sequentially arranged and stacked along the axial direction, and an expansion gap extending along the circumferential direction of the support member is defined between at least two adjacent support portions.

In the electrode assembly, the support piece is arranged, so that the risk of the pole piece collapsing into the central hole can be reduced, and the expansion gap is arranged on the support piece, so that when the pole piece expands, the expansion gap can absorb at least part of the expanded volume to reduce the possibility of the pole piece cracking, and the battery monomer and the battery have better safety.

Referring to fig. 1, a battery 100 disclosed in the embodiment of the present application may be used in an electric device such as a vehicle 1000, a ship, or an aircraft, but is not limited thereto. The power supply system including the battery 100 disclosed in the present application may be used to optimize the operation performance of the battery cell 20 and the battery 100.

The embodiment of the present application provides an electric device using a battery 100 as a power source, and the electric device may be, but is not limited to, a mobile 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. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

For convenience of description, the following embodiments are described by taking an electric device according to an embodiment of the present application as an example of a vehicle 1000.

The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc. The battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may serve as an operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

In some embodiments of the present application, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1000.

Referring to fig. 2, the battery 100 includes a case 10 and a battery cell 20. The case 10 serves to provide a receiving space for the battery cells 20, and the case 10 may take various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 together define an inner space for accommodating the battery 100. The second part 12 can be a hollow structure with one open end, the first part 11 can be a plate-shaped structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a containing cavity; the first portion 11 and the second portion 12 may be both hollow structures with one side open, and the open side of the first portion 11 may cover the open side of the second portion 12. Of course, the first portion 11 and the second portion 12 form a generally cylindrical housing 10.

In the battery 100, there may be a plurality of battery cells 20, and the plurality of battery cells 20 may be connected in series or in parallel or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the plurality of battery cells 20. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery cells 20 is accommodated in the box body 10; of course, the battery 100 may also be formed by connecting a plurality of battery cells 20 in series, in parallel, or in series-parallel to form a battery module, and then connecting a plurality of battery modules in series, in parallel, or in series-parallel to form a whole, and accommodating the whole in the case 10. The battery 100 may also include other structures, for example, the battery 100 may further include a bus member for achieving electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery.

Referring to fig. 3, the battery cell 20 is a minimum unit constituting the battery 100. The battery cell 20 includes a case 21, an end cap 22, an electrode assembly 23, and other functional components.

The end cap 22 refers to a member that covers an opening of the case 21 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 22 may be adapted to the shape of the housing 21 to fit the housing 21. Alternatively, the end cap 22 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the end cap 22 is not easily deformed when being impacted, and the battery cell 20 may have a higher structural strength and improved safety. The end cap 22 may be provided with functional parts such as electrode terminals. The electrode terminals may be used to electrically connect with the electrode assembly 23 for outputting or inputting electric energy of the battery cell 20. In some embodiments, a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value may also be disposed on the end cap 22. In some embodiments, insulation may also be provided on the inside of the end cap 22, which may be used to isolate the electrical connection components within the housing 21 from the end cap 22 to reduce the risk of short circuits. Illustratively, the insulator may be plastic, rubber, or the like.

The case 21 is an assembly for fitting the end cap 22 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the electrode assembly 23, an electrolyte (not shown in the drawings), and other components. The housing 21 and the end cap 22 may be separate components, and an opening may be provided in the housing 21, and the opening may be covered by the end cap 22 to form the internal environment of the battery cell 20. The end cap 22 and the housing 21 may be integrated, and specifically, the end cap 22 and the housing 21 may form a common connecting surface before other components are inserted into the housing, and when it is required to seal the inside of the housing 21, the end cap 22 covers the housing 21. Specifically, the shape of the case 21 may be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 21 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present invention is not limited thereto.

Referring to fig. 4 together, the electrode assembly 23 is a part of the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be contained within the case 21. The electrode assembly 23 includes a body 231 and a supporting member 232, the body 231 is provided with a central hole 2311 along the winding axial direction X, the supporting member 232 is located in the central hole 2311 and extends along the axial direction X, the supporting member 232 includes a plurality of supporting portions 2321 sequentially arranged and stacked along the axial direction X, and an expansion gap 2322 extending along the circumferential direction of the supporting member 232 is defined between at least two adjacent supporting portions 2321.

The two adjacent supporting portions 2321 are stacked in a direct stacking manner and an indirect stacking manner, where the direct stacking manner is that the two adjacent supporting portions 2321 are directly stacked, and the indirect stacking manner is that the two adjacent supporting portions 2321 are indirectly stacked through other components.

The common body 231 mainly includes a winding type body 231 and a stacking type body 231, the stacking type body 231 is mainly applied to the square battery cell 20, and the winding type body 231 is mainly applied to the cylindrical battery cell 20. The wound body 231 is mainly formed by winding and placing the positive electrode sheet and the negative electrode sheet, and the laminated body 231 is mainly formed by stacking and placing the positive electrode sheet and the negative electrode sheet. In addition, the separator is provided between the positive electrode sheet and the negative electrode sheet in the wound or stacked body 231. The portions of the positive and negative electrode sheets having the active material constitute the main body portion of the body 231, and the portions of the positive and negative electrode sheets having no active material each constitute a tab. The positive electrode tab 2313 and the negative electrode tab 2315 may be located at one end of the body portion together or at both ends of the body portion, respectively. During the charge and discharge of the battery 100, the positive and negative active materials react with the electrolyte, and the tabs are connected to the electrode terminals to form a current loop.

The stacked body 231 does not have the center hole 2311, and the following examples are described with the battery cell 20 being a cylindrical battery cell 20 and the body 231 being a wound body. For the coiled body 231, the central portion of the body 231 has a central hole 2311 disposed through the body 231 in the axial direction X of the coil.

Alternatively, the supporting members 232 may be molded of plastic, paper, or other insulating materials, and each of the supporting portions 2321 is an insulating part to prevent the supporting members 232 from interfering with the charge and discharge of the electrode assembly 23.

The supporting portion 2321 may be spherical, oval, hexahedral, or in other shapes, and may be specifically configured as required.

At least two adjacent support portions 2321 are enclosed to form an inflation gap 2322 extending along the circumferential direction of the support member 232, for example, only the inflation gap 2322 is enclosed between the two adjacent support portions 2321, or the inflation gap 2322 is enclosed between each two adjacent support portions 2321, and so on.

Specifically, the number of the supporting portions 2321 may be set according to the axial length X of the central hole 2311, and it is only necessary to ensure that the supporting member 232 formed by combining the plurality of supporting portions 2321 can stably support the body 231. Alternatively, the support member 232 may be entirely within the central bore 2311 or may partially extend out of the central bore 2311.

In actual assembly, the plurality of supporting portions 2321 are sequentially inserted into the central hole 2311, and the electrode assembly 23 is assembled.

The support 232 is located in the central hole 2311 and extends in the axial direction X, so that the support 232 can support the body 231 to prevent the pole piece from collapsing into the central hole 2311; further, an expansion gap 2322 extending along the circumferential direction of the support 232 is defined between at least two adjacent support portions 2321, and when the pole piece expands, the expansion gap 2322 can absorb at least a part of the expanded volume to reduce the possibility of cracking of the pole piece, so that the battery cell 20 and the battery 100 have excellent safety.

It should be noted that the pole piece in the present application may be a positive pole piece, may also be a negative pole piece, or may also include a positive pole piece and a negative pole piece, specifically based on the situation occurring in the actual use process. For example, assuming that the positive electrode tab is easily collapsed into the central hole 2311 during actual use, the supporting function of the supporting member 232 can reduce the possibility that the positive electrode tab is collapsed into the central hole 2311.

In some embodiments of the present application, an expansion gap 2322 is defined between each two adjacent supporting portions 2321.

Thus, the support member 232 is formed with a plurality of the swelling gaps 2322 arranged in sequence in the winding axial direction X. As a matter of value, the location at which the expansion gap 2322 is disposed should correspond to the location of the easy expansion of the pole piece. For example, if the pole piece has three easy-expansion positions in the axial direction X of the body 231, three expansion gaps 2322 sequentially arranged along the axial direction X of the body 231 may be disposed on the supporting member 232, and the three expansion gaps 2322 correspond to the three easy-expansion positions one by one, and when each easy-expansion position expands, the expanded volume can be absorbed by the corresponding expansion gap 2322.

In this embodiment, when the pole piece expands at the position where the pole piece is easily expanded corresponding to the plurality of swelling gaps 2322, each swelling gap 2322 can absorb the expansion volume at the corresponding position where the pole piece is easily expanded, which is helpful to further reduce the risk of cracking the pole piece, so that the battery cells 20 and the battery 100 have better safety.

In some embodiments of the present application, in the axial direction X, each support 2321 has a first end 2323 and a second end 2324 that run along the axial direction X; in a direction away from the second end 2324, the width of the first end 2323 in the radial direction Y of the central hole 2311 gradually decreases; and/or the width of the second end 2324 in the radial direction Y of the central bore 2311 gradually decreases in a direction away from the first end 2323.

The direction away from the second end 2324 and the direction away from the first end 2323 both coincide with the axial direction X of the body 231.

If the first end 2323 and the second end 2324 are directly connected, the connection between the first end 2323 and the second end 2324 of the supporting portion 2321 mainly plays a supporting role. If the first end 2323 and the second end 2324 are connected through the middle section, the middle section of the supporting portion 2321 plays a main supporting role.

There is no or very little clearance between the junction or intermediate segment of the first and second ends 2323 and 2324 and the bore wall of the bore 2311, and there is a clearance between the first and second ends 2323 and 2324 and the bore wall of the bore 2311.

In actual assembly, the first end 2323 first extends into the central hole 2311, and then the second end 2324 extends into the central hole 2311 as the support 2321 continues to move. During removal, the second end 2324 first protrudes out of the central hole 2311, and then the first end 2323 protrudes out of the central hole 2311 as the support 2321 continues to move. It is understood that the operations of inserting and removing each supporting portion 2321 are performed according to the above-mentioned placing manner, and thus, the description thereof is omitted.

By being disposed in a direction away from the second end 2324, the width of the first end 2323 in the radial direction Y of the center hole 2311 is gradually reduced, facilitating the placement of the support 2321 into the center hole 2311; and the width of the second end 2324 in the radial direction Y of the central hole 2311 is gradually reduced in a direction away from the first end 2323, so that the supporting part 2321 can be conveniently taken out and the supporting part 232 can be conveniently replaced.

In some embodiments of the present application, the support 232 further includes a receiving portion having a receiving cavity extending along the axial direction X, and each support 2321 is received in the receiving cavity and abuts against a cavity wall of the receiving cavity.

In practice, the supporting members 232 are formed by sequentially placing the supporting members 2321 into the receiving cavities in advance, and the supporting members 232 are directly inserted into the central holes 2311 to support the body 231.

The receiving portion may be a bag-shaped, tubular or other elastic member. When all the supporting portions 2321 are arranged in the receiving portions and put into the central hole 2311, since the receiving portions are elastic members, after the pole piece is expanded, the expanded volume can be absorbed by the expansion gap 2322 by pressing the receiving portions.

By providing the receiving portion, all the supporting portions 2321 combined to form the supporting member 232 may form a whole, so as to facilitate the quick assembly of the supporting member 232 in the central hole 2311.

In some embodiments of the present application, the receptacle is a film member.

For example, the storage unit is a film bag.

When the pole piece expands and presses the receiving portion, the receiving portion may be recessed into the swelling gap 2322 under the effect of the expansion force, so that the swelling gap 2322 can absorb the volume of the expansion of the pole piece. Since the thin film member is thin, the volume occupied by the receiving portion in the expansion gap 2322 is small, so that the expansion gap 2322 has a good expansion effect. In addition, the film component has better elasticity, is not easy to damage after being deformed under the action of the expansion force in time, and has longer service life.

In some embodiments of the present application, in the radial direction Y of the center hole 2311, a gap between an outer wall of the support piece 232 and a hole wall of the center hole 2311 is L, and L satisfies a condition: l is more than or equal to 3mm and less than or equal to 5mm.

Wherein the outer surface of each support 2321 includes an inflation surface and a support surface connected to each other, the inflation surface of each support 2321 is used to enclose an inflation gap 2322 with the inflation surface of the adjacent support 2321, and the support surface of each support 2321 is used to support the central hole 2311. The support surface is constituted by a portion of the support 2321 on which the maximum outer diameter is provided in the radial direction Y of the center hole 2311. The support surface configuration of all supports 2321 forms the outer wall of the support 232.

Under the gap, the supporting requirement of the supporting piece 232 can be met, the pole piece can be prevented from collapsing into the central hole 2311, and in the process that the supporting piece 232 extends into and out of the central hole 2311, the supporting piece 232 can be prevented from being in hard contact with the hole wall of the central hole 2311 and being extruded with the hole wall of the central hole 2311 to cause damage to the body 231.

In some embodiments of the present application, the support 2321 is a spherical structure.

The support 2321 may have a solid spherical structure, a hollow and closed spherical structure, or a hollow and unsealed spherical structure. The hollow and unsealed spherical structure means that the support 2321 has a cavity and an opening communicating with the cavity. The diameter of the support 2321 is R, and R satisfies the condition: r is more than or equal to 3mm and less than or equal to 5mm.

Generally, the spherical structure has a relatively smooth surface, so that in the process of placing the support 2321 into the central hole 2311, the abrasion between the support 2321 and the hole wall of the central hole 2311 can be reduced, and the body 231 can be further prevented from being damaged.

In some embodiments of the present application, the supporting portion 2321 is opened with a liquid storage through hole 2325 for storing an electrolyte.

The liquid storage through hole 2325 penetrates the entire support 2321. Each support 2321 may be provided with one or more liquid storage through holes 2325, and if there are multiple liquid storage through holes 2325, the through holes on the same support 2321 may be communicated with each other or independently provided, and may be specifically set as required.

The liquid storage through hole 2325 has a liquid retention capacity. Through setting up the stock solution through-hole 2325, the stock solution through-hole 2325 can store some electrolyte, and this part electrolyte can flow out and supply to centre bore 2311 and fully soak the pole piece near centre bore 2311 after battery cell 20 rotates certain angle to help promoting battery cell 20's energy density.

Referring to fig. 5, in some embodiments of the present disclosure, the supporting member 232 further includes an expanding portion 2326, and at least one expanding portion 2326 is interposed between at least two adjacent supporting portions 2321.

Preferably, every two adjacent struts 2326 are connected by a strut 2326.

The shape of the expanding portion 2326 may be a rod, a block, a sheet or other irregular shape, which may be specifically selected according to requirements.

At least one expansion portion 2326 is interposed between at least two adjacent support portions 2321, that is, at least two adjacent support portions 2321 are stacked by at least one expansion portion 2326, and two adjacent support portions 2321 are connected by the expansion portion 2326 therebetween.

By providing the expanding portion 2326, the two supporting portions 2321 interposed therebetween can be connected to form a whole, thereby facilitating the integrity of the supporting member 232 and facilitating the assembly. Further, the setting of the distracting portion 2326 may also enlarge the space between the two supporting portions 2321 sandwiching it, so that the expansion gap 2322 formed between the two supporting portions 2321 has a larger dimension in the axial direction X of the body 231. In this way, the swelling gap 2322 may absorb a greater volume of expansion, thereby helping to further enhance the safety of the battery cell 20.

Referring again to fig. 3, in a second aspect, the present application further provides a battery cell 20 including an electrode assembly 23 according to any one of the above embodiments.

Referring to fig. 2 again, in a third aspect, the present application further provides a battery 100 including the battery cell 20 according to the above embodiment.

In a fourth aspect, the present application further provides an electrical device, which includes the battery 100 according to the above embodiment, wherein the battery 100 is used for providing electrical energy for the electrical device.

Referring to fig. 3 to 5, according to some embodiments of the present disclosure, an electrode assembly 23 is provided, where the electrode assembly 23 includes a body 231 and a supporting member 232, the body 231 is provided with a central hole 2311 along a winding axial direction X, the supporting member 232 is located in the central hole 2311 and extends along the axial direction X, the supporting member 232 includes a plurality of supporting portions 2321 sequentially arranged and stacked along the axial direction X, and an expansion gap 2322 is defined between each two adjacent supporting portions 2321.

In such an electrode assembly 23, the supporting member 232 may support the body 231 to prevent the pole piece from collapsing into the central hole 2311, and when the pole piece expands at the easily expandable position corresponding to the plurality of swelling gaps 2322 one by one, each swelling gap 2322 may absorb the expansion volume at the corresponding easily expandable position, thereby helping to further reduce the risk of cracking of the pole piece, so that the battery cell 20 and the battery 100 have better safety.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.

Claims (12)

1. An electrode assembly, characterized in that the electrode assembly comprises:

a body (231) having a center hole (2311) formed therethrough in the axial direction (X) of winding; and

the supporting piece (232) is located in the central hole (2311) and extends along the axial direction (X), the supporting piece (232) comprises a plurality of supporting portions (2321) which are sequentially arranged and stacked along the axial direction (X), and an inflation gap (2322) extending along the circumferential direction of the supporting piece (232) is formed between at least two adjacent supporting portions (2321).

2. The electrode assembly according to claim 1, wherein the swelling gap (2322) is defined between every two adjacent supporting parts (2321).

3. An electrode assembly according to claim 1, characterized in that, in the axial direction (X), each support (2321) has a first end (2323) and a second end (2324) running in the axial direction (X);

-said first end (2323) tapers in width in a radial direction (Y) of said central bore (2311) in a direction away from said second end (2324); and/or

The width of the second end (2324) in a radial direction (Y) of the central bore (2311) decreases in a direction away from the first end (2323).

4. The electrode assembly according to claim 1, wherein the support (232) further comprises a receiving portion having a receiving cavity extending in the axial direction (X), each support (2321) being received in the receiving cavity and abutting against a cavity wall of the receiving cavity.

5. The electrode assembly according to claim 4, wherein the receiving part is a film member.

6. An electrode assembly according to claim 1, characterized in that in the radial direction (Y) of the central bore (2311), the gap between the outer wall of the support (232) and the wall of the bore of the central bore (2311) is L, L satisfying the condition: l is more than or equal to 3mm and less than or equal to 5mm.

7. The electrode assembly according to claim 1, wherein the support portion (2321) is a spherical structure.

8. The electrode assembly according to any one of claims 1 to 7, wherein the supporting portion (2321) is provided with a liquid storage through hole (2325) for storing an electrolyte.

9. The electrode assembly according to any one of claims 1 to 7, wherein the support member (232) further includes a spreading portion (2326), and at least one spreading portion (2326) is interposed between at least two adjacent support portions (2321).

10. A battery cell comprising an electrode assembly according to any one of claims 1 to 9.

11. A battery comprising the cell of claim 10.

12. An electrical consumer comprising a battery as claimed in claim 11 for providing electrical power to the consumer.

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