CN216928689U - Battery cell, battery and electric equipment - Google Patents
Battery cell, battery and electric equipment Download PDFInfo
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- CN216928689U CN216928689U CN202221341884.3U CN202221341884U CN216928689U CN 216928689 U CN216928689 U CN 216928689U CN 202221341884 U CN202221341884 U CN 202221341884U CN 216928689 U CN216928689 U CN 216928689U
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Abstract
The application discloses battery monomer, battery and consumer. The battery cell includes: a housing having a receiving cavity; the electrolyte and the electrode assembly are arranged in the accommodating cavity; the liquid guiding device comprises a first liquid guiding part, at least part of the first liquid guiding part is connected to the electrode assembly, the first liquid guiding part is used for absorbing electrolyte and conducting the electrolyte to the electrode assembly, the speed of the first liquid guiding part for absorbing the electrolyte is greater than that of the electrode assembly, and the mass M of the absorbed electrolyte of the first liquid guiding part in a first preset time T1 Q The mass M of the first liquid guide member satisfies the relation M Q the/M is more than or equal to 1.05, and the first preset time T1 is more than or equal to 10S. Through setting up first drain spare in the technical scheme of this application toThe electrolyte is absorbed, and at least part of the first liquid guide part is connected with the electrode assembly, so that the contact between the surface of the electrode assembly and the electrolyte is improved, the infiltration degree of the electrode assembly is improved, and the efficiency and the safety of the battery monomer are improved.
Description
Technical Field
The present application relates to the field of batteries, and in particular, to a battery cell, a battery, and an electrical device.
Background
The battery cell is widely used in electronic devices such as a mobile phone, a notebook computer, a battery car, an electric airplane, an electric ship, an electric toy car, an electric toy ship, an electric toy airplane, an electric tool, and the like. The battery monomer can comprise a cadmium-nickel battery monomer, a hydrogen-nickel battery monomer, a lithium ion battery monomer, a secondary alkaline zinc-manganese battery monomer and the like.
At present, a single battery comprises an electrode assembly and electrolyte, and the charging and discharging performance of the single battery is greatly influenced by the infiltration degree of the electrolyte on the electrode assembly. When the battery cell is in use, if the electrolyte is lacked, the lithium precipitation phenomenon of the electrode assembly is easy to occur, and therefore, how to improve the infiltration degree of the electrode assembly is one of the important research points in the art.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, the present application provides a battery cell, a battery and an electric device, which can improve the infiltration degree of an electrode assembly in an electrolyte and improve the safety and efficiency of the battery.
In a first aspect, the present application provides a battery cell, comprising:
a housing having a receiving cavity;
the electrolyte is arranged in the accommodating cavity;
an electrode assembly disposed within the receiving cavity;
the liquid guide device comprises a first liquid guide part, at least part of the first liquid guide part is connected with the electrode assembly, the first liquid guide part is used for absorbing electrolyte and conducting the electrolyte to the electrode assembly,
the electrolyte absorption speed of the first liquid guide member is greater than that of the electrode assembly, and the absorbed electrolyte of the first liquid guide member in the first preset time T1Mass M of the solution Q The mass M of the first liquid guide member satisfies the relation M Q the/M is more than or equal to 1.05, wherein the first preset time T1 is more than or equal to 10S.
Among the technical scheme of this application embodiment, absorb electrolyte through setting up first drain spare to be connected first drain spare at least part and electrode subassembly, in order to promote the contact of electrode subassembly surface and electrolyte, promote electrode subassembly's infiltration degree, promote single efficiency and the security of battery.
In some embodiments, the first fluid director is disposed between the housing and the electrode assembly. According to the technical scheme, the first liquid guide piece is arranged in the space between the shell and the electrode assembly, so that the space in the battery cell can be effectively utilized.
In some embodiments, the electrode assembly includes two first surfaces disposed opposite to each other in the first direction, and each first surface is provided with a first liquid guide. According to the technical scheme, the first liquid guide parts are arranged on the two opposite sides of the electrode assembly, so that the infiltration degrees of the two sides of the electrode assembly are close to each other, and the service life of the electrode assembly is prolonged.
In some embodiments, the first liquid guiding member is attached to the first surface. By means of the technical scheme, the electrolyte absorbed in the first liquid guide piece can be transferred to the first surface of the electrode assembly, and the wetting degree of the first surface is improved.
In some embodiments, the electrode assembly is provided in plurality, and the plurality of electrode assemblies are stacked in the first direction; a first liquid guide part is arranged between at least two adjacent electrode assemblies. In the structure, the plurality of electrode assemblies and the first liquid guiding piece are arranged, so that the amount of electrolyte absorbed by the first liquid guiding piece can be increased, the contact area between the electrode assemblies and the electrolyte is further increased, and the partial electrolyte infiltration degree between the electrode assemblies can be effectively increased by arranging the first liquid guiding piece between every two adjacent electrode assemblies.
In some embodiments, the housing comprises a shell and an end cover, wherein the end of the shell along the second direction is provided with an opening, and the end cover is covered on the opening; the first liquid guide member extends along the second direction. In the above-described structure, the first liquid guiding member is provided to extend in the second direction, and the electrolyte at the bottom of the case is transported to the top, so that the balance of the electrolyte on the surface of the electrode assembly can be adjusted in the second direction.
In some embodiments, a cross-section of the first fluid-conducting member perpendicular to the second direction gradually increases in a direction approaching the end cap. By the structure, the electrolyte absorbed by the first liquid guide piece at the end close to the end cover can be increased, the amount of the electrolyte contacted with the electrode assembly close to the end cover is increased, the electrolyte infiltration degree of the two ends of the electrode assembly is consistent, and the service life of the electrode assembly is prolonged.
In some embodiments, the liquid guiding device further includes a second liquid guiding member, the second liquid guiding member is connected to one end of the first liquid guiding member, at least a portion of the second liquid guiding member is attached to the electrode assembly, the second liquid guiding member is configured to absorb the electrolyte and conduct the electrolyte to the electrode assembly, and a speed of the second liquid guiding member absorbing the electrolyte is greater than a speed of the first liquid guiding member absorbing the electrolyte. More electrolyte is absorbed by the second liquid guiding piece, the second liquid guiding piece can absorb the electrolyte on the first liquid guiding piece, the electrolyte is evenly distributed at one end of the first liquid guiding piece, the distribution balance of the electrolyte on the surface of the electrode assembly is further improved, and the overall infiltration degree of the electrode assembly is improved.
In some embodiments, the second fluid conducting member is connected to an end of the first fluid conducting member adjacent the end cap. By the structure, the electrolyte absorbed by the second liquid guide part can increase the contact area of the electrolyte on one end of the electrode assembly close to the end cover, further improve the balance of the distribution of the electrolyte on the surface of the electrode assembly, and improve the efficiency and the safety of the electrode assembly.
In some embodiments, the mass M1 of electrolyte absorbed by the first fluid conducting member in the predetermined time and the mass M2 of electrolyte absorbed by the electrode assembly in the predetermined time satisfy the relationship, wherein M1 > M2. By means of the technical scheme, the speed of the first liquid guide part for absorbing the electrolyte is higher than the speed of the electrode assembly for absorbing the electrolyte, the electrolyte distribution on the surface of the electrode assembly is balanced, and the electrolyte infiltration degree of the electrode assembly is improved.
In some embodiments, M1 and M2 also satisfy the relationship, M1/M2 ≧ 1.02. Through setting up foretell electrolyte absorption speed proportion, guarantee that first drain spare can be very fast absorption electrolyte, promote the efficiency of first drain spare evenly distributed electrolyte.
In some embodiments, the fluid guide device further comprises a squeezing assembly disposed between the first fluid guide and the housing to force the electrolyte out of the first fluid guide. In the technical scheme, the electrolyte in the first liquid guide piece is released and infiltrates the surface of the electrode assembly by arranging the liquid squeezing assembly, so that the electrolyte amount of the first liquid guide piece and the electrolyte amount on the surface of the electrode assembly can be flexibly adjusted.
In some embodiments, the squeezing assembly includes an expansion sheet, at least a portion of the expansion sheet is disposed between the first fluid-conducting member and the housing, and the expansion sheet increases in volume to squeeze the first fluid-conducting member. Foretell technical scheme, the expansion piece is heated the volume increase and is formed the extrusion release electrolyte to first drain spare, simple structure, the operation of being convenient for.
In some embodiments, the swelling sheet absorbs the electrolyte at a rate less than a rate at which the electrode sheet of the electrode assembly absorbs the electrolyte. By adopting the technical scheme, the absorption of the expansion sheet to the electrolyte can be reduced, and the amount of the electrolyte on the surface of the electrode assembly can be ensured.
In some embodiments, the mass M3 of the electrolyte absorbed by the expansion sheet in the second preset time T2 and the mass M of the first liquid guide member satisfy the relationship, M3/M is less than or equal to 0.05, and the second preset time T2 is more than or equal to 24h.
In a second aspect, the present application provides a battery, which includes the battery cell in the above embodiments.
In a third aspect, the present application provides an electric device, which includes the battery in the above embodiments, wherein the battery is used for providing electric energy.
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
Features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.
FIG. 1 is a schematic structural view of a vehicle according to some embodiments of the present application;
FIG. 2 is an exploded view of a battery according to some embodiments of the present application;
fig. 3 is a schematic structural view of the battery module shown in fig. 2;
FIG. 4 is a schematic structural view of a fluid directing device provided in some embodiments of the present application;
FIG. 5 is a schematic view of a first fluid-conducting element according to some embodiments of the present disclosure;
FIG. 6 is a schematic view of a first fluid directing element according to still other embodiments of the present application;
FIG. 7 is a schematic view of a first fluid directing element according to yet another embodiment of the present application;
FIG. 8 is a schematic diagram of a fluid directing device according to other embodiments of the present application;
FIG. 9 is a schematic view of a fluid directing device according to yet other embodiments of the present application;
FIGS. 10-17 are schematic structural views of a second fluid-conducting member in various embodiments of the present application;
FIG. 18 is a schematic diagram of a wringing assembly according to some embodiments of the present application.
Reference numerals describe in detail:
1000. a vehicle; x, a first direction; y, a second direction;
100. a battery; 200. a controller; 300. a motor;
10. a box body; 11. a first case; 12. a second case;
20. a battery cell; 201. A housing; 21. an end cap; 22. a housing; 23. an electrode assembly; 2301. a first surface; 24. a pressure relief mechanism; 25. an electrode terminal; 27. an accommodating chamber;
26. a drainage device; 2601. a first liquid-guiding member; 2602. a first portion; 2603. a second portion; 2605. A second liquid-guiding member; 2606. a body; 2607. an extension portion; 2608. an upper liquid guide member; 2609. a lower liquid guide member; 2610. an intumescent sheet.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.
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 application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof in the description and claims of this application and the description of the figures above, are intended to cover non-exclusive inclusions.
In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or to implicitly indicate the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.
In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.
In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two sets), "plural pieces" refers to two or more (including two pieces).
In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.
In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. Specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.
At present, the market of new energy automobiles develops rapidly, batteries are used as power sources of the new energy automobiles, and the safety and reliability degree of the batteries are very important to the whole system. The minimum constituent unit in the battery is a single battery, the single battery usually comprises an electrode assembly and electrolyte, and the charge and discharge performance of the single battery is greatly influenced by the infiltration degree of the electrolyte on the electrode assembly. When the single battery is used, if electrolyte is lacked, the lithium precipitation phenomenon is easy to occur on the electrode assembly, so that the capacity of the single battery is reduced, and the service life and the use safety of the single battery are reduced.
In the existing single battery, electrolyte can be gathered at the bottom end of a shell due to gravity, and an electrode assembly near the top end of the shell is lack of electrolyte infiltration. During use, lithium precipitation may occur in the upper electrode assembly, so that the efficiency and safety of the entire battery cell are reduced, and the life span of the battery is shortened.
Based on the above problems, in order to improve the infiltration degree of the electrode assembly in the electrolyte and improve the safety and efficiency of the battery, the inventor designs a battery cell, wherein a liquid guiding device is arranged in a housing of the battery cell, the liquid guiding device comprises a first liquid guiding part, at least part of the first liquid guiding part is connected to the electrode assembly, and the first liquid guiding part is used for absorbing the electrolyte and conducting the electrolyte to the electrode assembly. The speed of the first liquid guide part absorbing the electrolyte is greater than that of the electrode assembly absorbing the electrolyte. Electrolyte is absorbed by arranging the first liquid guiding piece, and at least part of the first liquid guiding piece is connected with the electrode assembly, so that the contact between the surface of the electrode assembly and the electrolyte is improved, the infiltration degree of the electrode assembly is improved, and the efficiency and the safety of a battery monomer are improved.
The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric device can 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.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. 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 for power supply of 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 power requirements for operation during starting, navigation, and traveling of the vehicle 1000.
In some embodiments of the present application, the battery 100 may not only serve as an operating power source of the vehicle 1000, but also serve 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, fig. 2 is an exploded schematic view of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a case 10 and a battery cell (not shown in the drawings), which is accommodated in the case 10. The case 10 is used to provide a receiving space for the battery cells, and the case 10 may have various structures. In some embodiments, the case 10 includes a first case 11 and a second case 12, the first case 11 and the second case 12 cover each other, and the first case 11 and the second case 12 jointly define a receiving space for receiving the battery cell. The second box 12 may be a hollow structure with an opening at one end, the first box 11 may be a plate-shaped structure, and the first box 11 covers the opening side of the second box 12, so that the first box 11 and the second box 12 jointly define an accommodating space; the first casing 11 and the second casing 12 may be both hollow structures with one side open, and the open side of the first casing 11 may cover the open side of the second casing 12. Of course, the case 10 formed by the first case 11 and the second case 12 may have various shapes, for example, a cylindrical shape, a rectangular parallelepiped shape, etc.
In the battery 100, a plurality of battery cells may be provided, and the plurality of battery cells may be connected in series or in parallel or in series-parallel, where in series-parallel refers to that the plurality of battery cells are connected in series or in parallel. The plurality of battery cells may be directly connected in series or in parallel or in series-parallel, and the whole body formed by the plurality of battery cells is accommodated in the case 10. Of course, the battery 100 may also be formed by first connecting a plurality of battery cells in series, in parallel, or in series-parallel to form a battery module 30, and then connecting a plurality of battery modules 30 in series, in parallel, or in series-parallel to form a whole, and the whole is accommodated in the box 10.
Wherein, each battery cell can be a secondary battery or a primary battery; but not limited thereto, may also be a lithium sulfur battery cell, a sodium ion battery cell, or a magnesium ion battery cell. The battery cell 20 may also be cylindrical, flat, rectangular parallelepiped, or other shapes.
The battery cell in the embodiment of the present application refers to the smallest unit constituting the battery. As shown in fig. 3, the battery cell 20 includes an end cap 21, a case 22, an electrode assembly 23, and other functional components.
The end cap 21 is a member covering an opening of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 may be adapted to the shape of the housing 22 to fit the housing 22. Alternatively, the end cap 21 may be made of a material (e.g., an aluminum alloy) having certain hardness and strength, so that the end cap 21 is not easily deformed when being extruded and collided, and the single battery 20 may have higher structural strength and improved safety performance.
The end cap 21 may be provided with functional components such as the electrode terminal 25. The electrode terminal 25 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, the end cap 21 may further include a pressure relief mechanism 24 for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The material of the end cap 21 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment.
The electrode assembly 23 is a part in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 23 may be contained within the case 22. The electrode assembly 23 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode tabs having the active material constitute the body portions of the electrode assembly, and the portions of the positive and negative electrode tabs having no active material each constitute a tab. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively. During the charge and discharge of the battery, the positive and negative active materials react with the electrolyte, and the tabs are connected to the electrode terminals 25 to form a current loop.
Referring to fig. 4 to 9 in combination, fig. 4 is a schematic structural diagram of a drainage device 26 according to some embodiments of the present disclosure; FIG. 5 is a schematic view of a first fluid director 2601 according to some embodiments of the present application; FIG. 6 is a schematic view of a first fluid director 2601 in accordance with further embodiments of the present application; FIG. 7 is a schematic view of a first fluid conducting member 2601 according to still other embodiments of the present application; FIG. 8 is a schematic view of a fluid directing device 26 according to other embodiments of the present application; fig. 9 is a schematic structural diagram of a liquid guiding device 26 according to further embodiments of the present application.
As shown in fig. 4, a battery cell 20 provided in the embodiment of the present application includes: a case 201, an electrolyte (not shown), an electrode assembly 23, and a liquid guide 26. The housing 201 has a receiving cavity 27. The electrolyte is provided in the housing chamber 27. The electrode assembly 23 is disposed in the receiving cavity 27. The fluid guide 26 includes a first fluid guide 2601, at least a portion of the first fluid guide 2601 is connected to the electrode assembly 23, and the first fluid guide 2601 is configured to absorb an electrolyte and conduct the electrolyte to the electrode assembly 23. Wherein the first liquid guiding member 2601 absorbs the electrolyte at a speed higher than that of the electrode assembly 23, and the mass M of the absorbed electrolyte of the first liquid guiding member 2601 within the first predetermined time T1 Q The mass M of the first liquid guide piece 2601 satisfies the relationship M Q the/M is more than or equal to 1.05, wherein the first preset time T1 is more than or equal to 10S.
Wherein at least a portion of the first liquid guide 2601 is connected to the electrode assembly 23, at least a portion of the surface of the first liquid guide 2601 may be connected to the surface of the electrode assembly 23. The first liquid guide 2601 and the electrode assembly 23 may be bonded to each other by adhesive tape or by using glue to bond the electrode assembly 23. The electrode assembly 23 includes a positive electrode tab, a negative electrode tab, and a separator, and the first liquid guiding member 2601 absorbs the electrolyte at a rate greater than the rates of the positive and negative electrode tabs. Alternatively, the speed of the first liquid guiding member 2601 for absorbing the electrolyte is greater than the speed of the positive electrode sheet and the negative electrode sheet for absorbing the electrolyte, and is also greater than the speed of the isolating film for absorbing the electrolyte.
In the technical scheme of the embodiment of the application, the first liquid guide piece 2601 is arranged to absorb the electrolyte, the first liquid guide piece 2601 can absorb the electrolyte with the mass larger than the self mass in the first preset time T1, and at least part of the first liquid guide piece 2601 is connected with the electrode assembly 23, so that the contact between the surface of the electrode assembly 23 and the electrolyte is improved, the wetting degree of the electrode assembly 23 is improved, and the efficiency and the safety of the battery cell 20 are improved.
In some embodiments of the present application, as shown in FIG. 5, a first fluid conductor 2601 is disposed between the housing 201 and the electrode assembly 23. In the above-described technical solution, the first liquid guide 2601 is disposed in the space between the case 201 and the electrode assembly 23, so that the space in the battery cell 20 can be effectively utilized, and the volume of the battery cell 20 occupied by the first liquid guide 2601 can be reduced.
In some embodiments of the present application, as shown in fig. 6, the electrode assembly 23 includes two first surfaces 2301 oppositely disposed along the first direction X, and a first liquid guide 2601 is disposed on each first surface 2301. In the above technical solution, the first liquid guide members 2601 are disposed on two opposite sides of the electrode assembly 23, so as to ensure that the two sides of the electrode assembly 23 are close to each other in terms of wetting degree, and prolong the service life of the electrode assembly 23.
In some embodiments of the present application, first fluid director 2601 is disposed adjacent to first surface 2301. By adopting the technical scheme, the electrolyte absorbed by the first liquid guide 2601 can be transferred to the first surface 2301 of the electrode assembly 23, and the wetting degree of the first surface 2301 is improved.
In some embodiments of the present application, as shown in fig. 7, the electrode assembly 23 is provided in plurality, and the plurality of electrode assemblies 23 are stacked in the first direction X; a first liquid guide 2601 is disposed between at least two adjacent electrode assemblies 23. In the above structure, the arrangement of the plurality of electrode assemblies 23 and the first liquid guide 2601 can increase the efficiency of the first liquid guide 2601 in absorbing the electrolyte, and further increase the contact area between the electrode assemblies 23 and the electrolyte, and the arrangement of the first liquid guide 2601 between two adjacent electrode assemblies 23 can effectively increase the electrolyte infiltration degree of the part between the electrode assemblies 23.
In some embodiments of the present application, please refer to fig. 5 to fig. 7 in combination, the housing 201 includes a casing 22 and an end cap 21, an end of the casing 22 along the second direction Y has an opening, and the end cap 21 covers the opening; the first liquid guide 2601 extends in the second direction Y. In the above-described structure, the first liquid guide 2601 is extended in the second direction Y, and the electrolyte on the surface of the electrode assembly 23 can be adjusted in the second direction Y by transferring the electrolyte from the bottom to the top of the case 201.
In some embodiments of the present application, a cross-section of first liquid guide 2601 perpendicular to second direction Y is gradually increased in a direction approaching end cap 21. With the structure, the electrolyte absorbed by the first liquid guide 2601 at the end close to the end cap 21 can be increased, the amount of the electrolyte contacting the electrode assembly 23 close to the end cap 21 can be increased, the uniformity of the electrolyte wetting degree at the two ends of the electrode assembly 23 can be improved, and the service life of the whole electrode assembly 23 can be prolonged.
As shown in FIG. 8, in some embodiments of the present application, first fluid conducting member 2601 has a first portion 2602 and a second portion 2603, the second portion 2603 having a smaller cross-section than the first portion 2602. In the above configuration, the second portion 2603 may be disposed near the bottom end of the housing 201 and the first portion 2602 may be disposed near the end cap 21. The first liquid guiding member 2601 absorbs less electrolyte at the bottom end portion and more electrolyte at the top end, so that the electrolyte accumulated at the bottom end can be adjusted to the top end, the electrolyte infiltration degree of the electrode assembly 23 at the top end is improved, and the equilibrium of the electrode assembly 23 infiltrated in the electrolyte is ensured.
As shown in FIG. 9, in some embodiments of the present application, first fluid director 2601 is provided in a tapered configuration with a gradually increasing cross-section. In the above structure, by setting the first liquid guiding member 2601 to be tapered, the amount of electrolyte absorbed at the bottom part of the casing 201 is small, and the amount of electrolyte absorbed at the top end of the casing 201 is large, so that the electrolyte accumulated at the bottom of the electrode assembly 23 can be adjusted to the top end, the electrolyte infiltration degree of the electrode assembly 23 at the top end can be improved, and the equilibrium of the electrolyte infiltration of the electrode assembly 23 in the electrolyte can be ensured.
With continued reference to fig. 10-13, in some embodiments of the present disclosure, the liquid guiding device 26 further includes a second liquid guiding member 2605, the second liquid guiding member 2605 is connected to an end of the first liquid guiding member 2601, at least a portion of the second liquid guiding member 2605 is attached to the electrode assembly 23, the second liquid guiding member 2605 is configured to absorb the electrolyte and conduct the electrolyte to the electrode assembly 23, wherein a speed of the second liquid guiding member 2605 absorbing the electrolyte is greater than a speed of the first liquid guiding member 2601 absorbing the electrolyte.
In the above technical solution, by providing the second liquid guide 2605, more electrolyte in the accommodating cavity 27 can be absorbed, and the second liquid guide 2605 can absorb the electrolyte on the first liquid guide 2601, and the electrolyte is uniformly distributed at one end of the first liquid guide 2601, so that the balance of the electrolyte distribution on the surface of the electrode assembly 23 is further improved, and the wetting degree of the whole electrode assembly 23 is improved.
In some embodiments of the present application, as shown in FIG. 10, second fluid conducting member 2605 is coupled to an end of first fluid conducting member 2601 adjacent end cap 21. With the above structure, the electrolyte absorbed by the second liquid guiding member 2605 can increase the contact area of the electrolyte at the end of the electrode assembly 23 close to the end cap 21, further improve the balance of the distribution of the electrolyte on the surface of the electrode assembly 23, and improve the efficiency and safety of the electrode assembly 23.
In some embodiments of the present application, as shown in fig. 11, the second liquid guide members 2605 are connected to one end of the first liquid guide member 2601 close to the end cover 21, the number of the second liquid guide members 2605 is two, and two second liquid guide members 2605 are disposed on two sides of the first liquid guide member 2601 along the first direction X. In the above structure, two second liquid guiding members 2605 are provided, so that the electrolyte is uniformly distributed at the top end of the electrode assembly 23 along the two sides of the first direction X, thereby improving the wetting degree of the electrode assembly 23.
In some embodiments of the present application, as shown in fig. 12, the first liquid guiding member 2601 is disposed between two adjacent electrode assemblies 23, and can simultaneously wet the two electrode assemblies 23. And, second drain 2605 is connected to one end of first drain 2601 near end cap 21. In the above structure, the second liquid guiding member 2605 is arranged to perform uniform distribution of the electrolyte on the top of the electrode assembly 23, so as to improve the wetting degree of the top of the electrode assembly 23.
In some embodiments of the present application, as shown in FIG. 13, each of first and second fluid guides 2601 and 2605 are two in number. Two first liquid guides 2601 are disposed between the case 22 and the electrode assembly 23, and the two first liquid guides 2601 are disposed opposite to each other. Two second fluid guides 2605 are connected to one end of the first fluid guide 2601 near the end cap 21. In the above structure, the two first liquid guiding members 2601 are arranged to guide the electrolyte gathered at the bottom end of the case 201 to the top end, and the two second liquid guiding members 2605 arranged at the top end perform uniform distribution of the electrolyte on the two sides of the top end of the electrode assembly 23 along the first direction X, so as to improve the wetting degree of the electrode assembly 23.
With continued reference to fig. 14-17, in some embodiments of the present application, a second fluid conducting member 2605 is coupled to an end of the first fluid conducting member 2601. In the above embodiments, the end cap 21 may be disposed at the bottom or the side of the battery cell 20, and reference is made to the following embodiments.
In some embodiments of the present application, as shown in fig. 14 and 15, the end cap 21 is placed at the bottom, the first liquid guide 2601 may be disposed between an electrode assembly 23 and the casing 22 or between two adjacent electrode assemblies 23, and the second liquid guide 2605 is connected to an end of the first liquid guide 2601 away from the end cap 21. With the above structure, the second liquid guiding member 2605 absorbs the electrolyte to increase the contact area of the electrolyte at the top end of the electrode assembly 23, thereby further improving the uniformity of the distribution of the electrolyte on the surface of the electrode assembly 23 and improving the efficiency and safety of the electrode assembly 23.
In some embodiments of the present application, as shown in fig. 16, the second liquid guiding member 2605 includes a body 2606, the body 2606 extends along the first direction X to form an extending portion 2607, and the body 2606 and the extending portion 2607 are respectively attached to two adjacent electrode assemblies 23. In the structure, by arranging the extending part 2607, the action range of the second liquid guiding member 2605 can be expanded, the similar electrolyte infiltration degree of the two adjacent electrode assemblies 23 is ensured, and the service life of the battery cell 20 is prolonged.
In some embodiments of the present application, as shown in fig. 17, the number of the first liquid guide members 2601 is two, and the first liquid guide members 2601 include a lower liquid guide member 2609 extending in the first direction X and an upper liquid guide member 2608 extending in the second direction Y, and the upper liquid guide member 2608 and the lower liquid guide member 2609 are connected. The end cap 21 is disposed at a side of the electrode assembly 23, and the upper liquid guide 2608 is disposed opposite to the end cap 21. That is, the upper liquid guide 2608 is provided at the side of the housing 201 and is located away from one end of the end cap 21. A second drain 2605 is connected to an end of upper drain 2608 remote from lower drain 2609, and second drain 2605 is disposed at the top of electrode assembly 23.
In the above structure, the end cap 21 may be disposed at one side of the battery cell 20, i.e., the lower liquid guide 2609 is disposed at the bottom end of the electrode assembly 23. Therefore, lower drain 2609 absorbs electrolyte from the bottom of electrode assembly 23 and transfers it to upper drain 2608, and second drain 2605 absorbs electrolyte from upper drain 2608 to the top of electrode assembly 23. In the structure, the electrolyte is guided in the casing 22 by arranging the first liquid guiding members 2601, and is uniformly distributed at the top end of the electrode assembly 23, so that the electrolyte infiltration degree and the infiltration balance of the electrode assembly 23 are effectively improved.
In some embodiments of the present application, the mass M1 of the electrolyte absorbed by the first fluid guide 2601 in the predetermined time and the mass M2 of the electrolyte absorbed by the electrode assembly 23 in the predetermined time satisfy the relationship, wherein M1 > M2. First fluid conducting member 2601 may be a porous, somewhat compressible material. And the mass of the electrolyte absorbed by the first liquid guiding member 2601 in the preset time is greater than the mass of the electrolyte absorbed by the positive electrode plate, the negative electrode clamping piece and the isolating membrane in the preset time.
By adopting the technical scheme, the speed of the first liquid guide piece 2601 for absorbing the electrolyte is higher than the speed of the electrode assembly 23 for absorbing the electrolyte, the electrolyte distribution on the surface of the electrode assembly 23 is balanced, and the electrolyte infiltration degree of the electrode assembly 23 is improved.
In some embodiments of the present application, M1 and M2 also satisfy the relationship, M1/M2 ≧ 1.02. By setting the electrolyte absorption speed ratio, the first liquid guiding member 2601 can absorb electrolyte quickly, and the efficiency of the first liquid guiding member 2601 for uniformly distributing the electrolyte is improved.
In some embodiments of the present application, drain 26 further includes a wringing assembly disposed between first drain 2601 and housing 22 to force electrolyte out of first drain 2601. In the above technical solution, the electrolyte in the first liquid guide 2601 is released and wets the surface of the electrode assembly 23 by the liquid squeezing assembly, so that the electrolyte amount on the surfaces of the first liquid guide 2601 and the electrode assembly 23 can be flexibly adjusted.
In some embodiments of the present application, as shown in fig. 18, the fluid expression assembly includes an expansion plate 2610, at least a portion of the expansion plate 2610 is disposed between the first fluid guide 2601 and the housing 22, and the expansion plate 2610 increases in volume to compress the first fluid guide 2601. The expansion sheet 2610 can be made of material which expands after being electrified, such as piezoelectric ceramics. The expansion sheet 2610 can be connected with a power supply and a control valve, the expansion speed of the expansion sheet 2610 can be controlled by adjusting the electric quantity of the control valve, so that the extrusion strength of the expansion sheet 2610 on the first liquid guide member 2601 is adjusted, and finally, the volume of the electrolyte extruded by the first liquid guide member 2601 is controlled.
According to the technical scheme, the expansion piece 2610 is arranged to extrude the first liquid guide member 2601 to release electrolyte, so that the structure is simple, and operation is facilitated.
In some embodiments of the present application, the speed of the swelling sheet 2610 absorbing the electrolyte is less than the speed of the electrode sheet of the electrode assembly 23 absorbing the electrolyte, which can reduce the absorption of the swelling sheet 2610 to the electrolyte, and ensure the amount of the electrolyte on the surface of the electrode assembly 23.
In some embodiments of the present application, specifically, the mass M3 of the electrolyte absorbed by the expansion sheet 2610 in the second preset time T2 and the mass M of the first liquid guide 2601 satisfy the relationship, where M3/M is less than or equal to 0.05, and the second preset time T2 is greater than or equal to 24h. Through setting up the ability that reasonable inflation piece 2610 absorbed electrolyte, can effectively avoid inflation piece 2610 to absorb too much electrolyte in the use, reduce the electrolyte loss. For example, the expansion sheet 2610 may be made of a material having low water absorption and a large expansion coefficient, such as ceramic.
According to some embodiments of the present application, there is also provided a battery 100 including the battery cell 20 according to any of the above aspects. The above-mentioned single battery 20 is provided with the liquid guiding device 26, so that the technical effects of improving the wetting degree of the electrode assembly 23 in the electrolyte and improving the safety and efficiency of the battery 100 can be achieved.
According to some embodiments of the present application, the present application further provides an electric device, which includes the battery 100 according to any of the above aspects, and the battery 100 is used to provide electric energy for the electric device. The above-mentioned battery cell 20 can also realize the technical effects of improving the degree of wetting of the electrode assembly in the electrolyte, and improving the safety and efficiency of the battery due to the arrangement of the liquid guiding device 26. The powered device may be any of the aforementioned devices or systems that employ battery 100. On the premise that the battery cell 20 has the technical effects, the electric device in the application can run more stably, safely and efficiently.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein, but rather to cover all embodiments falling within the scope of the appended claims.
Claims (17)
1. A battery cell, comprising:
a housing having a receiving cavity;
the electrolyte is arranged in the accommodating cavity;
an electrode assembly disposed within the receiving cavity;
a liquid guiding device including a first liquid guiding member, at least a portion of the first liquid guiding member being connected to the electrode assembly, the first liquid guiding member for absorbing the electrolyte and conducting the electrolyte to the electrode assembly,
the speed of the first liquid guide absorbing the electrolyte is greater than the speed of the electrode assembly absorbing the electrolyte, and the mass M of the electrolyte absorbed by the first liquid guide in a first preset time T1 Q The mass M of the first liquid guide member satisfies the relation M Q the/M is more than or equal to 1.05, wherein the first preset time T1 is more than or equal to 10S.
2. The battery cell as recited in claim 1 wherein the first fluid conducting member is disposed between the housing and the electrode assembly.
3. The battery cell as recited in claim 2, wherein the electrode assembly includes two first surfaces disposed opposite to each other in the first direction, and the first liquid guide member is disposed on each of the first surfaces.
4. The battery cell as recited in claim 3, wherein the first liquid-guiding member is disposed adjacent to the first surface.
5. The battery cell according to claim 1, wherein the electrode assembly is provided in plurality, and the plurality of electrode assemblies are stacked in a first direction;
the first liquid guide part is arranged between at least two adjacent electrode assemblies.
6. The battery cell as recited in claim 1, wherein the housing includes a case body having an opening at an end in the second direction, and an end cap covering the opening;
the first liquid guide member extends along the second direction.
7. The battery cell as recited in claim 6, wherein a cross section of the first liquid guide member perpendicular to the second direction is gradually increased in a direction approaching the end cap.
8. The battery cell as recited in claim 1, wherein the liquid guiding device further comprises a second liquid guiding member connected to one end of the first liquid guiding member, and at least a portion of the second liquid guiding member is attached to the electrode assembly, the second liquid guiding member is configured to absorb the electrolyte and conduct the electrolyte to the electrode assembly, wherein the second liquid guiding member absorbs the electrolyte at a higher rate than the first liquid guiding member absorbs the electrolyte.
9. The battery cell as recited in claim 6, wherein the liquid guiding device further comprises a second liquid guiding element, the second liquid guiding element is connected to one end of the first liquid guiding element, at least a portion of the second liquid guiding element is attached to the electrode assembly, the second liquid guiding element is configured to absorb the electrolyte and conduct the electrolyte to the electrode assembly, wherein the speed of absorption of the electrolyte by the second liquid guiding element is greater than the speed of absorption of the electrolyte by the first liquid guiding element, and the second liquid guiding element is connected to one end of the first liquid guiding element close to the end cap.
10. The battery cell as recited in any one of claims 1 to 6, wherein a mass M1 of the electrolyte absorbed by the first liquid guide for a preset time, and a mass M2 of the electrolyte absorbed by the electrode assembly for the preset time satisfy a relationship, wherein M1 > M2.
11. The battery cell as recited in claim 10, wherein M1 and M2 further satisfy the relationship, M1/M2 ≧ 1.02.
12. The battery cell as recited in any one of claims 1-6, wherein the fluid conducting device further comprises a squeeze assembly disposed between the first fluid conducting member and the housing to force the electrolyte out of the first fluid conducting member.
13. The battery cell as recited in claim 12, wherein the squeeze assembly comprises an expansion sheet, at least a portion of the expansion sheet is disposed between the first fluid-conducting member and the housing, and the expansion sheet increases in volume to compress the first fluid-conducting member.
14. The battery cell of claim 13, wherein the swelling sheet absorbs the electrolyte at a rate less than a rate at which a pole piece of an electrode assembly absorbs the electrolyte.
15. The battery cell as recited in claim 13 or 14, wherein the mass M3 of the electrolyte absorbed by the expansion sheet within the second preset time T2 and the mass M of the first liquid guide member satisfy the relationship, M3/M is less than or equal to 0.05, and the second preset time T2 is greater than or equal to 24h.
16. A battery comprising a cell according to any one of claims 1 to 15.
17. An electrical consumer, characterized in that the consumer comprises a battery according to claim 16 for providing electrical energy.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221341884.3U CN216928689U (en) | 2022-06-01 | 2022-06-01 | Battery cell, battery and electric equipment |
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| CN202221341884.3U CN216928689U (en) | 2022-06-01 | 2022-06-01 | Battery cell, battery and electric equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115425374A (en) * | 2022-11-08 | 2022-12-02 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and power consumption device |
| CN116759769A (en) * | 2023-08-23 | 2023-09-15 | 深圳海辰储能控制技术有限公司 | Battery cell, energy storage device and power utilization system |
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2022
- 2022-06-01 CN CN202221341884.3U patent/CN216928689U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115425374A (en) * | 2022-11-08 | 2022-12-02 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and power consumption device |
| CN116759769A (en) * | 2023-08-23 | 2023-09-15 | 深圳海辰储能控制技术有限公司 | Battery cell, energy storage device and power utilization system |
| CN116759769B (en) * | 2023-08-23 | 2024-02-06 | 深圳海辰储能科技有限公司 | Battery cell, energy storage device and power utilization system |
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