CN117157825A

CN117157825A - Battery cell, battery, electric equipment and manufacturing method and equipment of battery cell

Info

Publication number: CN117157825A
Application number: CN202280027496.4A
Authority: CN
Inventors: 朱广浩; 邹洋; 余文杰; 迟庆魁; 金海族
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-01-14
Filing date: 2022-01-14
Publication date: 2023-12-01
Also published as: WO2023133852A1

Abstract

The application relates to a battery monomer, a battery, electric equipment and a manufacturing method and equipment of the battery monomer, wherein the battery monomer comprises the following components: an electrode assembly having a winding center hole extending from a first end to a second end of the electrode assembly; the support piece is tubular and penetrates through the winding center hole; a sleeve sleeved on the support member and positioned between the outer peripheral surface of the support member and the inner wall of the winding center hole, the support member being configured to support the electrode assembly through the sleeve; the sleeve and the support member are arranged in a cylindrical shape, wherein a diversion channel is defined between the inner peripheral surface of the sleeve and the outer peripheral surface of the support member, and extends from the first end to the second end. The application realizes the improvement of electrolyte wettability and the prevention of overlarge local internal pressure by arranging the parallel central channel (the inner space of the supporting piece) and the diversion channel, thereby improving the service performance and the safety of the battery.

Description

Battery cell, battery, electric equipment and manufacturing method and equipment of battery cell

Technical Field

The application relates to the technical field of batteries, in particular to a battery cell, a battery, electric equipment and a manufacturing method and equipment of the battery cell.

Background

Under the large environment pursuing energy conservation and emission reduction, the battery is widely applied to electric equipment such as mobile phones, computers and electric automobiles and provides electric energy for the electric equipment. With the development of technology, higher demands are being made on the performance and safety of batteries.

Disclosure of Invention

The application aims to provide a battery monomer, a battery, electric equipment and a manufacturing method and equipment of the battery monomer so as to improve the service performance and safety of the battery.

Embodiments of the present application are implemented as follows:

in a first aspect, an embodiment of the present application provides a battery cell, including: an electrode assembly having a winding center hole extending from a first end to a second end of the electrode assembly; the support piece is tubular and penetrates through the winding center hole; a sleeve sleeved on the support member and located between an outer circumferential surface of the support member and an inner wall of the winding center hole, the support member being configured to support the electrode assembly through the sleeve; wherein a flow guide channel is defined between the inner peripheral surface of the sleeve and the outer peripheral surface of the support member, the flow guide channel extending from the first end to the second end.

The inner space (hereinafter referred to as the central channel) and the diversion channel of the support piece are both used for allowing electrolyte to flow, one of the central channel and the diversion channel is blocked, the other can allow the electrolyte to flow, the inner space of the winding central hole is prevented from being completely blocked, the electrolyte is ensured to be uniformly distributed in the battery cell, the wettability of the electrolyte is improved, and therefore the cycle performance, the discharge capacity and the service life of the battery are improved. Meanwhile, the central channel and the diversion channel can also be used for allowing gas to circulate so as to ensure that the pressure inside the battery monomer is kept uniform, thereby preventing the problems of damage and thermal runaway caused by overlarge local internal pressure and overhigh local temperature and improving the safety of the battery. Therefore, the scheme realizes the improvement of electrolyte wettability by arranging the parallel central channel and the parallel diversion channel, and avoids overlarge local internal pressure, thereby improving the service performance and the safety of the battery.

In one embodiment of the present application, a first through hole is provided on a side wall of the support member, and the first through hole is used for communicating an inner space of the support member with the diversion channel.

In the above technical scheme, through setting up first through-hole intercommunication central passage (i.e. support piece's inner space) and water conservancy diversion passageway, when one of them local jam of central passage and water conservancy diversion passageway, its unblocked part still can play the circulation effect, further alleviates the problem of jam, improves the infiltration effect of electrolyte, improves the free security of battery.

In one embodiment of the present application, the number of the diversion channels is plural, and the diversion channels are distributed at intervals along the circumferential direction of the support member.

In the technical scheme, the plurality of diversion channels are parallel to the central channel by increasing the number of the diversion channels, so that the problem of blockage and non-circulation is less likely to occur, and on the other hand, the flow rate of the plurality of diversion channels is greater than that of a single diversion channel, so that the rate and effect of electrolyte infiltrating the electrode assembly are improved, the discharge rate of the central region of the electrode assembly is also improved, and the service performance and safety of the battery are further improved.

In one embodiment of the present application, each of the flow guide channels communicates with the inner space of the support member through a plurality of the first through holes spaced along the extending direction thereof.

In the technical scheme, each diversion channel is communicated with the central channel through the plurality of first through holes, so that the probability that the central channel and the diversion channel cannot be communicated due to the blocking of the first through holes is reduced, the probability that the inner space of the winding central hole is blocked is further reduced, and the usability of the battery unit and the safety of the battery unit are further guaranteed.

In one embodiment of the present application, the outer circumferential surface of the support member is a cylindrical surface, the inner circumferential surface of the sleeve is a prismatic surface, the outer circumferential surface of the support member is tangent to the inner circumferential surface of the sleeve, and the flow guiding channel is formed between two adjacent tangent lines.

In the technical scheme, the outer peripheral surface of the support piece is set to be a cylindrical surface, the inner peripheral surface of the sleeve is set to be a prismatic surface, and the support piece is directly inserted into the sleeve during assembly to play a role in supporting the electrode assembly, form a flow channel and are convenient to assemble. On the other hand, when the sleeve is used in the process of winding and forming the electrode assembly, the sleeve can be used for inserting the winding needle, the sleeve can prevent the winding needle from being inserted and pulled to scratch the pole piece or cause the pole piece to wrinkle, and meanwhile, the inner peripheral surface of the sleeve is matched with the outer peripheral surface of the winding needle (namely, the outer peripheral surface of the winding needle is also prismatic surface), so that the winding needle has the effect of being difficult to slip; after the electrode assembly is wound and formed, the winding needle is pulled out, the sleeve can temporarily support the electrode assembly, the winding center Kong Takong is prevented, and the support piece is prevented from scratching the pole piece or wrinkling the pole piece in the inserting and pulling process.

In one embodiment of the present application, the diameter of the first through hole is D1, the outer diameter of the support member is D2, and the number of edges of the inner circumferential surface of the sleeve is n, which satisfies the following conditions:

sin5°≤D1/D2≤sin(360°/2n)。

in the technical scheme, the first through hole is not easy to be blocked by the inner peripheral surface of the sleeve, two sides of the first through hole can be ensured to be contacted with two adjacent prismatic surfaces or two prismatic surfaces at a contact interval, so that the supporting area of the supporting piece on the circumference of the first through hole is prevented from being too small, the supporting strength of the supporting piece on the sleeve is ensured, and the sleeve is prevented from being unevenly deformed to block the first through hole.

In one embodiment of the present application, the outer circumferential surface of the support member is prismatic, the inner circumferential surface of the sleeve is cylindrical, and the edge of the outer circumferential surface of the support member abuts against the inner circumferential surface of the sleeve.

In the above technical solution, when the outer peripheral surface of the support member is prismatic surface and the inner peripheral surface of the sleeve is cylindrical surface, the first through hole is not easily blocked at any position of the outer peripheral surface of the support member.

In one embodiment of the present application, a second through hole is provided on a side wall of the sleeve, and the second through hole is communicated with the diversion channel.

In the technical scheme, electrolyte can flow downwards along the diversion channel, and can also wind the pole piece at the central hole through the second through hole Kong Jinrun, so that the infiltration effect is improved.

In one embodiment of the application, the diameter of the second through hole is smaller than the diameter of the first through hole.

In the technical scheme, as the diameter of the second through hole is smaller than that of the first through hole, the size of the impurities such as pole piece fragments entering the diversion channel through the second through hole is smaller, and the first through hole is not easy to be blocked, so that the diversion channel and the central channel are communicated, the probability that the inner space of the winding central hole is blocked is reduced, and the infiltration effect of electrolyte and the safety of a battery monomer are ensured.

In one embodiment of the present application, the battery cell further includes a buffer member, and the buffer member has a mesh structure and covers the second through hole.

In the technical scheme, the buffer structure is arranged to buffer the force of the electrolyte flowing out of the second through hole, so that the impact force of the electrolyte on the inner wall of the winding center hole is reduced, and the pole piece is prevented from being damaged or wrinkled.

In one embodiment of the present application, one of the outer circumferential surface of the support member and the inner circumferential surface of the sleeve is provided with a limit projection, and the other is provided with a limit groove, and the limit projection cooperates with the limit groove to limit the relative rotation of the support member and the sleeve.

In the technical scheme, the first through hole is prevented from shifting by limiting the relative rotation of the supporting piece and the sleeve, and the flow guide channel and the central channel are ensured to be communicated.

In one embodiment of the application, the electrode assembly includes a first tab at the first end and a second tab at the second end, the first tab and the second tab being opposite in polarity; the battery cell further includes: the shell assembly comprises a first electrode leading-out part and a second electrode leading-out part, wherein the first electrode leading-out part and the second electrode leading-out part are used for inputting or outputting electric energy, the electrode assembly is arranged in the shell assembly, the first electrode leading-out part and the second electrode leading-out part are all arranged on one side, close to the first electrode lug, of the shell assembly, the first electrode leading-out part is electrically connected with the first electrode lug, and the supporting piece is used for connecting the second electrode lug with the second electrode leading-out part so as to realize the electrical connection of the second electrode lug with the second electrode leading-out part.

In the technical scheme, the supporting piece has the function of circulation and the function of electric connection, an electric connection part is not required to be additionally arranged in the battery monomer, the energy density of the battery monomer is ensured, the power passing through the shell body is not required, and the safety of the battery monomer is improved.

In one embodiment of the present application, the second electrode lead-out portion is provided with a liquid injection hole, and the liquid injection hole is disposed opposite to one end of the support member.

In the technical scheme, the electrolyte is conveniently injected through the injection hole on the first electrode leading-out part and the supporting piece, so that the electrolyte is beneficial to flowing to the other end of the electrode assembly, and the infiltration efficiency of the electrolyte is improved.

In one embodiment of the application, the housing assembly further comprises a pressure relief mechanism configured to be actuated to release the internal pressure of the battery cell when the internal pressure or temperature of the battery cell reaches a threshold, the pressure relief mechanism being disposed on a side of the housing assembly adjacent to the second tab and opposite the other end of the support.

In the technical scheme, the pressure release mechanism is arranged at the other end of the supporting piece, the discharge can reach the pressure release mechanism through the central channel and the diversion channel, the discharge path is short, the discharge speed is high, and the discharge can flow to the pressure release mechanism for discharge due to the fact that the central channel and the diversion channel are not easy to block, so that the safety of the battery cell is improved.

In one embodiment of the application, the sleeve is made of an insulating material.

In the technical scheme, the sleeve plays a role in insulating and isolating the supporting piece and the electrode assembly, prevents the pole pieces with opposite polarities of the supporting piece and the electrode assembly from contacting to short-circuit, and improves the safety of the battery cell.

In one embodiment of the present application, the battery cell further includes: a current collector attached to the second tab and adapted to connect the second tab and the support to make electrical connection of the second tab and the support.

In the technical scheme, the current collector can increase the electric connection area of the support piece and the second lug, improve the overcurrent capacity and improve the electric connection reliability of the support piece and the second lug. Through setting up the collector, still make things convenient for support piece and second pole ear electricity to be connected, improved connection efficiency.

In one embodiment of the application, the support is provided with a fuse.

In the above technical scheme, the highest temperature part of the electrode assembly is often at the central part, namely the position close to the winding central hole, and the fusing part of the support member can be disconnected in response to local high temperature and excessive current at first, so that the battery cell cannot continue to charge and discharge, more serious accidents are avoided, and the safety of the battery cell is improved.

In one embodiment of the present application, a second through hole is provided on a side wall of the sleeve, the second through hole is communicated with the diversion channel, and the fusing part is staggered from the second through hole.

In the scheme, the metal slag generated by fusing the support piece does not easily pass through the second through hole to enter the winding center hole, so that the metal slag is prevented from piercing the isolation piece and the pole piece, and further, pole piece lap short circuits with opposite polarities are avoided, and the support piece and the pole piece lap short circuits with opposite polarities of the support piece are avoided, so that the safety of the battery cell is improved.

In a second aspect, an embodiment of the present application provides a battery, which includes the foregoing battery cell.

In a third aspect, an embodiment of the present application provides an electrical device, including the foregoing battery.

In a fourth aspect, an embodiment of the present application provides a method for manufacturing a battery cell, including: providing an electrode assembly having a winding central bore extending from a first end to a second end of the electrode assembly; providing a support, the support being tubular; providing a sleeve; the sleeve is sleeved on the supporting piece, so that a flow guide channel is defined between the inner peripheral surface of the sleeve and the outer peripheral surface of the supporting piece, the supporting piece and the sleeve penetrate through the winding center hole, the supporting piece supports the electrode assembly through the sleeve, and the flow guide channel extends from the first end to the second end.

In a fifth aspect, an embodiment of the present application provides an apparatus for manufacturing a battery cell, including: a first providing means for providing an electrode assembly having a winding center hole extending from a first end to a second end of the electrode assembly; a second providing device for providing a support, the support being tubular; third providing means for providing a sleeve; the assembly device is used for sleeving the sleeve on the support piece so as to limit a flow guide channel between the inner peripheral surface of the sleeve and the outer peripheral surface of the support piece, and is used for penetrating the support piece and the sleeve into the winding center hole so as to enable the support piece to support the electrode assembly through the sleeve, and enable the flow guide channel to extend from the first end to the second end.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

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

fig. 2 is an exploded view of a battery according to an embodiment of the present application;

fig. 3 is a front view of a battery cell according to an embodiment of the present application;

fig. 4 is a schematic view illustrating an internal structure of a battery cell according to an embodiment of the application;

FIG. 5 is an enlarged view of portion B of FIG. 4;

FIG. 6 is a top view of a support and sleeve provided in accordance with one embodiment of the present application;

FIG. 7 is a cross-sectional view of FIG. 6C-C;

FIG. 8 is a front view of a support and sleeve provided in accordance with one embodiment of the present application;

FIG. 9 is a section D-D of FIG. 8;

FIG. 10 is a schematic view of a diameter of a first through hole according to an embodiment of the present application;

FIG. 11 is a section E-E of FIG. 8;

FIG. 12 is an enlarged view of portion F of FIG. 4;

FIG. 13 is an enlarged view of portion G of FIG. 4;

FIG. 14 is a schematic perspective view of a support member according to an embodiment of the present application;

FIG. 15 is a front view of a support member according to an embodiment of the present application;

FIG. 16 is a section H-H of FIG. 15;

FIG. 17 is a schematic view showing the internal structure of a support and a sleeve according to an embodiment of the present application;

FIG. 18 is a perspective view of a support and sleeve provided in accordance with one embodiment of the present application;

fig. 19 is a flowchart illustrating a method for manufacturing a battery cell according to an embodiment of the application;

Fig. 20 is a schematic block diagram of an apparatus for manufacturing a battery cell according to an embodiment of the present application.

Icon: 1000-vehicle; 100-cell; 200-motor; 300-a controller; 101-a box body; 1011-a first box portion; 1012-a second box portion; 102-battery cell; 1-an electrode assembly; 1 a-a first end; 1 b-a second end; 11-a first tab; 12-second pole ear; 2-a support; 21-a central channel; 22-a first through hole; 23-a limit groove; 24-fusing part; 3-sleeve; 31-a second through hole; 32-cushioning; 33-limiting protrusions; 4-a diversion channel; a 5-housing assembly; 51-a housing body; 52-a first electrode lead-out portion; 53-a second electrode lead-out portion; 531-filling holes; 532-seals; 54-a pressure release mechanism; 6-collector; 61-flow channel; 7-manufacturing equipment; 71-first providing means; 72-a second providing means; 73-third providing means; 74-assembly device.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

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 in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: there are three cases, a, B, a and B simultaneously. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

The term "plurality" as used herein refers to two or more (including two).

In the present application, the battery cells may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, which is not limited in the embodiment of the present application.

Reference to a battery in accordance with an embodiment of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, or the like. The battery generally includes a case for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

The battery cell includes an electrode assembly and an electrolyte, the electrode assembly including a positive electrode tab, a negative electrode tab, and a separator. The battery cell mainly relies on metal ions to move between the positive pole piece and the negative pole piece to work. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive current collector comprises a positive current collecting part and a positive lug, wherein the positive current collecting part is coated with a positive active material layer, and the positive lug is not coated with the positive active material layer. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collecting portion and a negative electrode tab, the negative electrode current collecting portion being coated with a negative electrode active material layer, the negative electrode tab not being coated with the negative electrode active material layer. The material of the anode current collector may be copper, the anode active material layer includes an anode active material, and the anode active material may be carbon or silicon, or the like. The material of the separator may be PP (polypropylene) or PE (polyethylene), etc.

The development of battery technology is to consider various design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate, and other performance parameters. The infiltration effect of the electrolyte on the pole piece is positively related to the cycle life, the discharge capacity and the service life of the battery monomer. When the infiltration effect of the electrolyte is poor, the transmission path of metal ions is far, the shuttling of the metal ions between the positive electrode plate and the negative electrode plate is blocked, the electrode plate which is not infiltrated by the electrolyte cannot participate in electrochemical reaction, and meanwhile, the interface resistance is increased, so that the cycle performance, the discharge capacity and the service life of the battery are affected.

The electrode assembly is formed by winding a wound body formed by overlapping a positive electrode plate, a negative electrode plate and a separator in a crossed mode and winding around a central axis. The winding center of the wound electrode assembly generally has a winding center hole for allowing the electrolyte to circulate so that the electrolyte can rapidly fill the inside of the battery cell and infiltrate the electrode assembly. Once the winding center hole is blocked, the electrolyte can not flow smoothly, the electrolyte can not fill the inside of the battery cell rapidly, and the electrode assembly can not be infiltrated well.

In view of this, in order to improve the cycle performance, discharge capacity and service life of the battery, the application provides a technical scheme, a support member and a sleeve are arranged in a winding central hole of an electrode assembly, the sleeve is sleeved on the support member and is positioned between the outer peripheral surface of the support member and the inner wall of the winding central hole, the support member is configured into a tube shape, a central channel is formed in the center of the support member to be communicated with two ends of the electrode assembly, a diversion channel is defined between the outer peripheral surface of the support member and the inner wall of the winding central hole, the diversion channel is communicated with two ends of the electrode assembly, both the central channel and the diversion channel are used for communicating electrolyte, the central channel can be used for communicating through the diversion channel when the central channel is blocked, and the diversion channel can be used for communicating through the central channel when the diversion channel is blocked, so that the channel capable of communicating electrolyte is always arranged in the winding central hole, the problem that the electrolyte infiltration effect is poor due to the blockage of the winding central hole is relieved, the electrolyte infiltration effect is effectively improved, and the cycle performance, discharge capacity and service life of the battery are improved.

On the other hand, the support piece supports the electrode assembly through the sleeve, prevents the winding center Kong Takong from loosening inwards, prevents the distance between adjacent electrode plates from increasing, and further prevents the transmission path of metal ions from becoming far and the interface resistance from increasing due to the distance between the adjacent electrode plates from increasing, thereby improving the cycle performance, the discharge capacity and the service life of the battery.

In addition, in the charge-discharge process, the electrode assembly can generate heat and gas, and the support piece and the sleeve are arranged in the winding central hole so as to support the electrode assembly and form a central channel and a diversion channel, so that the problem of blockage of the winding central hole is effectively relieved, the heat and gas generated in the central area of the electrode assembly are conveniently discharged, the internal pressure of the battery is ensured to be uniform, and the situation that the local internal pressure of the battery is overlarge due to blockage of the winding central hole is avoided, so that the battery is prevented from being damaged or the safety problem is caused.

The technical scheme described by the embodiment of the application is suitable for the battery and the electric equipment using the battery.

The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric equipment in particular.

For convenience of explanation, the following embodiments take electric equipment as an example of a vehicle.

The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like. As shown in fig. 1, a battery 100, a controller 300, and a motor 200 may be provided inside a vehicle 1000, and the controller 300 is used to control the battery 100 to supply power to the motor 200. For example, the battery 100 may be provided at the bottom or the head or tail of the vehicle 1000. Battery 100 may be used to power vehicle 1000, for example, battery 100 may be used as an operating power source for vehicle 1000, for circuitry of vehicle 1000, for example, for operating power requirements during start-up, navigation, and operation of vehicle 1000. In another embodiment of the present application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

To meet different power requirements, as shown in fig. 2, the battery 100 may include a plurality of battery cells 102, where the plurality of battery cells 102 are connected in series or parallel or in series-parallel, and the series-parallel refers to a mixture of series and parallel. Battery 100 may also be referred to as a battery 100 pack. Alternatively, the plurality of battery cells 102 may be connected in series, parallel or series-parallel to form a battery module, and then connected in series, parallel or series-parallel to form the battery 100. That is, the plurality of battery cells 102 may be directly assembled into the battery 100, or may be assembled into a battery module, and the battery module may be assembled into the battery 100.

The battery 100 may further include a case 101 (or called a cover), in which the case 101 has a hollow structure, and a plurality of battery cells 102 are accommodated in the case 101. The housing 101 may include two portions for receiving (see fig. 2), referred to herein as a first housing portion 1011 and a second housing portion 1012, respectively, the first housing portion 1011 and the second housing portion 1012 snap-fit together. The shape of the first and second case parts 1011 and 1012 may be determined according to the shape of the combination of the plurality of battery cells 102, and the first and second case parts 1011 and 1012 may each have one opening. For example, each of the first case portion 1011 and the second case portion 1012 may be a hollow rectangular parallelepiped and only one surface thereof is an opening surface, the opening of the first case portion 1011 and the opening of the second case portion 1012 are disposed opposite to each other, and the first case portion 1011 and the second case portion 1012 are engaged with each other to form the case 101 having a closed chamber. One of the first housing portion 1011 and the second housing portion 1012 may be a rectangular parallelepiped having an opening, and the other may be a cover plate structure to close the opening of the rectangular parallelepiped. The plurality of battery cells 102 are connected in parallel or in series-parallel, and then placed in the case 101 formed by the first case 1011 and the second case 1012 after being fastened.

As described in detail below with respect to any one of the battery cells 102, as shown in fig. 3, 4 and 5, the battery cell 102 includes an electrode assembly 1, a support member 2, and a sleeve 3, the electrode assembly 1 having a winding center hole extending from a first end 1a to a second end 1b of the electrode assembly 1, the support member 2 being tubular and penetrating the winding center hole, the sleeve 3 being disposed to be sleeved on the support member 2 between an outer circumferential surface of the support member 2 and an inner wall of the winding center hole, the support member 2 being configured to support the electrode assembly 1 through the sleeve 3; wherein a flow guiding channel 4 is defined between the inner circumferential surface of the sleeve 3 and the outer circumferential surface of the support 2, the flow guiding channel 4 extending from the first end 1a to the second end 1b.

The first end 1a and the second end 1b of the electrode assembly 1 are opposite ends in the extending direction of the winding center hole of the electrode assembly 1.

The support 2 is a member for supporting the electrode assembly 1, and the support 2 is disposed at a winding center hole of the electrode assembly 1 for preventing the winding center Kong Takong from being loosened inward of the electrode assembly 1.

The sleeve 3 is a component separating the support 2 and the electrode assembly 1. The supporting piece 2 and the sleeve 3 are both of tubular structures, and the supporting piece 2 is inserted into the sleeve 3. The support 2 supporting the electrode assembly 1 through the sleeve 3 means that the outer circumferential surface of the support 2 abuts against the inner circumferential surface of the sleeve 3, and the outer circumferential surface of the sleeve 3 abuts against the inner wall of the winding center hole of the electrode assembly 1. The support 2 may be made of a relatively strong, relatively hard material, for example metal.

The flow guide channel 4 is a gap between an inner circumferential surface of the sleeve 3 and an outer circumferential surface of the support 2, a portion of the outer circumferential surface of the support 2 abuts against the inner circumferential surface of the sleeve 3 to support the electrode assembly 1, and another portion of the outer circumferential surface of the support 2 does not contact the inner circumferential surface of the sleeve 3 to form the flow guide channel 4. The diversion channel 4 may extend from the first end 1a to the second end 1b along a straight line or may extend from the first end 1a to the second end 1b along a curve. The flow areas of the flow channels 4 may be the same or different in the direction of extension of the flow channels 4, which refers to the cross-sectional area of the flow channels 4 perpendicular to the direction of extension thereof.

In the above technical solution, the inner peripheral surface of the support member 2 encloses into the central channel 21, and meanwhile, a diversion channel 4 is defined between the outer peripheral surface of the support member 2 and the inner wall of the winding central hole, the central channel 21 and the diversion channel 4 are all in supply with electrolyte, when the central channel 21 is blocked, the diversion channel 4 can be circulated through, when the diversion channel 4 is blocked, the diversion channel 21 can be circulated through, so that the channel capable of supplying electrolyte is always provided in the winding central hole, the problem that the electrolyte infiltration effect is poor due to the blocking of the winding central hole is relieved, the infiltration effect of the electrolyte is effectively improved, the cycle performance, the discharge capacity and the service life of the battery 100 are improved, the problems that the temperature, the gas and the like generated in the central region of the electrode assembly 1 cannot be discharged are also relieved, the local internal pressure of the battery 102 is excessive due to the blocking of the winding central hole is avoided, the internal pressure uniformity of the battery 102 is ensured, and the safety of the battery 102 is improved.

According to some embodiments of the present application, as shown in fig. 5, a first through hole 22 is provided on a sidewall of the support 2, and the first through hole 22 is used to communicate the inner space of the support 2 with the diversion channel 4.

The inner space of the support 2 is a space surrounded by the inner peripheral surface of the support 2, that is, the central passage 21 in the present application refers to the inner space of the support 2.

The first through hole 22 is a through hole penetrating from the outer peripheral surface of the support 2 to the inner peripheral surface of the support 2.

Through setting up first through-hole 22 intercommunication central channel 21 and water conservancy diversion passageway 4, even the local jam of central channel 21, electrolyte in the central channel 21 can get into water conservancy diversion passageway 4 from first through-hole 22, and the part that central channel 21 was not blocked can be used for circulating electrolyte or emission (such as temperature, gas, impurity etc.), on the contrary, electrolyte or emission in water conservancy diversion passageway 4 also can get into central channel 21 through first through-hole 22 and discharge, further alleviate the problem of jam, improve the infiltration effect of electrolyte, improve the security of battery monomer 102. That is, when one of the central passage 21 and the diversion passage 4 is partially blocked, the unblocked portion thereof still plays a role in circulation, further alleviating the blocking problem, improving the wetting effect of the electrolyte, and improving the safety of the battery cell 102.

According to some embodiments of the present application, as shown in fig. 6, the number of the flow guiding channels 4 is plural, and the plurality of flow guiding channels 4 are spaced apart along the circumferential direction of the support 2.

In other words, the outer circumferential surface of the support 2 and the inner circumferential surface of the sleeve 3 define a plurality of flow guiding channels 4, each flow guiding channel 4 extending from the first end 1a to the second end 1b.

On the one hand, by increasing the number of the diversion channels 4, the electrolyte can circulate through the diversion channels 4, so that the circulation path from the first end 1a to the second end 1b is less prone to be blocked, the electrolyte can circulate, the flow rate of the diversion channels 4 is larger than that of a single diversion channel 4, and the rate and effect of the electrolyte infiltrating the electrode assembly 1 are improved; on the other hand, the discharge rate of the central region of the electrode assembly 1 is also improved, and the safety of the battery cell 102 is improved.

According to some embodiments of the present application, as shown in fig. 7, each of the guide channels 4 communicates with the inner space of the support 2 through a plurality of first through holes 22 spaced along the extending direction thereof.

When a plurality of first through holes 22 are arranged, one or some first through holes 22 are blocked, the other first through holes 22 or other first through holes enable the central channel 21 to be communicated with the diversion channel 4, the probability that the central channel 21 and the diversion channel 4 cannot be communicated due to the blocking of the first through holes 22 is reduced, the probability that the inner space of the winding central hole is blocked is reduced by ensuring the intercommunication of the central channel 21 and the diversion channel 4, and the infiltration effect of electrolyte and the safety of the battery cell 102 are ensured.

According to some embodiments of the present application, as shown in fig. 8 and 9, the outer circumferential surface of the support member 2 is a cylindrical surface, the inner circumferential surface of the sleeve 3 is a prismatic surface, the outer circumferential surface of the support member 2 is tangential to the inner circumferential surface of the sleeve 3, and a diversion channel 4 is formed between two adjacent tangential lines.

The inner peripheral surface of the sleeve 3 encloses a prismatic cavity, and the prisms can be triangular prisms, quadrangular prisms, pentagonal prisms and the like, and can be regular prisms or special-shaped prisms. As shown in fig. 9, in the present embodiment, the inner peripheral surface of the sleeve 3 encloses a regular hexagonal prism-shaped cavity.

As shown in fig. 9, the support member 2 is cylindrical, and the outer peripheral surface of the support member 2 is a cylindrical surface which is tangent to each surface of the regular hexagonal prism and has one tangent line. The outer circumferential surface of the support member 2 contacts the inner circumferential surface of the sleeve 3 at a tangent line, and the rest of the outer circumferential surface of the support member 2 does not contact the inner circumferential surface of the sleeve 3, so that a diversion channel 4 is formed between two adjacent tangent lines. As shown in fig. 9, six diversion passages 4 are formed between the outer peripheral surface of the support 2 and the inner peripheral surface of the sleeve 3.

The outer peripheral surface of the support piece 2 is set to be a cylindrical surface, the inner peripheral surface of the sleeve 3 is set to be a prismatic surface, and the support piece 2 is directly inserted into the sleeve 3 during assembly to play a role in supporting the electrode assembly 1, and the flow channel 61 is formed, so that the assembly is convenient.

In addition, sleeve 3 can also use at electrode assembly 1 coiling shaping in-process, can set up the needle of rolling up on the equipment to the prism the same with sleeve 3's inner space shape, the outer peripheral face of needle of rolling up cooperates with sleeve 3's inner peripheral face, has the effect that is difficult to skid, after electrode assembly 1 coiling shaping, take out the needle of rolling up, sleeve 3 stays in electrode assembly 1's coiling centre bore, on the one hand can temporarily support electrode assembly 1, prevent coiling centre Kong Takong, on the other hand has reduced sleeve 3 and has inserted the step in coiling centre bore, avoid inserting sleeve 3's in-process fish tail pole piece, lead to the pole piece to beat.

According to some embodiments of the present application, as shown in fig. 10, the diameter of the first through hole 22 is D1, the outer diameter of the support member 2 is D2, and the number of edges of the inner circumferential surface of the sleeve 3 is n, satisfying:

sin5°≤D1/D2≤sin(360°/2n)。

referring to fig. 10, in the radial cross sections of the support 2 and the sleeve 3, the central angle corresponding to one end of the first through hole 22 located on the outer circumferential surface of the support 2 is α. The diameter D1 of the first through hole 22 and the diameter D2 of the support member 2 form two sides of a right triangle, and a perpendicular bisector of the diameter D1 of the first through hole 22 bisects the diameter D2 of the support member 2 and bisects a central angle α corresponding to one end of the outer peripheral surface of the support member 2 of the first through hole 22. Combining the triangle-shaped isostatic theorem and the sine theorem, the following is obtained: d1/d2=sin (α/2), wherein the diameter D2 of the support 2 is determined, and the diameter D1 of the first through hole 22 is positively correlated with the magnitude of the included angle α.

When the sleeve 3 and the support 2 are interference-fitted, the inner peripheral surface of the sleeve 3 and/or the outer peripheral surface of the support 2 may be deformed by pressing, that is, the contact portion of the inner peripheral surface of the sleeve 3 and the outer peripheral surface of the support 2 is not a tangent line in an ideal state, the inner peripheral surface of the sleeve 3 and the outer peripheral surface of the support 2 are deformed by pressing each other and form a region having a certain width, and when the first through hole 22 is located at one end of the outer peripheral surface of the support 2 at exactly the region, the first through hole 22 is easily blocked by the inner peripheral surface of the sleeve 3. In order to prevent the first through hole 22 from being plugged, through multiple experiments, the minimum value of the included angle alpha is set to be 10 degrees, namely D1/D2=sin (alpha/2) is not less than sin5 degrees, so that the first through hole 22 is not easy to be plugged.

In addition, the included angle α is set to be equal to or smaller than the inner angle of the prism so as to ensure that the diameter D1 of the first through hole 22 is smaller than the side length of the prism, which is the side length of the polygon formed by the radial cross section of the inner peripheral surface of the sleeve 3. That is, D1/D2=sin (α/2). Ltoreq.sin (360 °/2 n). When the first through hole 22 is just in the tangential area of the support 2 and the sleeve 3, the two sides of the first through hole 22 are ensured to be tangential to the two adjacent prismatic surfaces of the prismatic surface where the first through hole 22 is positioned; when the first through hole 22 is in the area where the diversion channel 4 is located, the two sides of the first through hole 22 are ensured to be tangent to the two adjacent prismatic surfaces; so as to ensure the supporting strength of the supporting member 2 to the sleeve 3, in which case the sleeve 3 is not easily unevenly deformed to collapse toward the first through hole 22, thereby also serving the purpose of preventing the inner peripheral surface of the sleeve 3 from clogging the first through hole 22.

According to other embodiments of the application, the shape of the outer circumferential surface of the support member 2 and the inner circumferential surface of the sleeve 3 may be exchanged, i.e. the outer circumferential surface of the support member 2 is prismatic, the inner circumferential surface of the sleeve 3 is cylindrical, and the edges of the outer circumferential surface of the support member 2 abut against the inner circumferential surface of the sleeve 3.

The support 2 is prismatic, and the outer peripheral surface of the support 2 is prismatic. The inside of the sleeve 3 forms a cylindrical cavity, and the inner circumferential surface of the sleeve 3 is a cylindrical surface. The inner peripheral surface of the sleeve 3 is a circumscribing circle of the outer peripheral surface of the support member 2, so that the edge of the outer peripheral surface of the support member 2 abuts against the inner peripheral surface of the sleeve 3.

When the outer peripheral surface of the support 2 is prismatic, and the inner peripheral surface of the sleeve 3 is cylindrical, the first through holes 22 are not easily blocked.

In other embodiments, the flow guide channel 4 may be formed between the outer circumferential surface of the support member 2 and the inner circumferential surface of the sleeve 3 in other ways, for example, an inwardly concave groove is formed on the outer circumferential surface of the support member 2, or an outwardly concave groove is formed on the inner circumferential surface of the sleeve 3, so that the outer circumferential surface of the support member 2 and the inner circumferential surface of the sleeve 3 are prevented from being entirely contacted, and the flow guide channel 4 is formed at the position of the groove.

Referring to fig. 9 again, according to some embodiments of the present application, a second through hole 31 is provided on a sidewall of the sleeve 3, and the second through hole 31 communicates with the diversion channel 4.

The second through hole 31 is a through hole penetrating from the outer peripheral surface of the sleeve 3 to the inner peripheral surface of the support 2.

Because the interval between the inner wall of the winding center hole and the outer peripheral surface of the sleeve 3 is small, the pole piece of the inner wall of the winding center hole is not easy to infiltrate, and the electrolyte can flow downwards along the diversion channel 4 by arranging the second through hole 31 on the sleeve 3, and the pole piece at the winding center hole can be infiltrated through the second through hole 31, so that the infiltration effect is improved.

Referring to fig. 9 again, according to some embodiments of the present application, the diameter of the second through hole 31 is smaller than the diameter of the first through hole 22.

Because the diameter of the second through hole 31 is smaller than that of the first through hole 22, impurities such as pole piece fragments and the like which can pass through the second through hole 31 can be prevented from blocking through the first through hole 22, the first through hole 22 is not easy to block, so that the communication between the diversion channel 4 and the central channel 21 is ensured, the probability that the inner space of the winding central hole is blocked is reduced, and the infiltration effect of electrolyte and the safety of the battery cell 102 are ensured.

According to some embodiments of the present application, as shown in fig. 9, the battery 100 unit further includes a buffer member 32 having a mesh structure and covering the second through hole 31.

When the sleeve 3 is matched with the winding needle, before the pole piece and the separator are wound around the sleeve 3, the starting end of the separator and the starting end of the pole piece are required to be respectively adhered to the outer peripheral surface of the sleeve 3, when the impact force of electrolyte on the inner wall of the winding central hole after passing through the second through hole 31 is overlarge, the adhesion position is easy to loose, the starting end of the pole piece and the starting end of the separator are separated from the outer peripheral surface of the sleeve 3, the pole piece and the separator lose tension to shrink and wrinkle, and the buffer structure is arranged to buffer the force of the electrolyte flowing out of the second through hole 31, so that the force of the electrolyte on the inner wall of the winding central hole is reduced, and the pole piece is prevented from being damaged or wrinkled.

According to some embodiments of the present application, one of the outer circumferential surface of the support 2 and the inner circumferential surface of the sleeve 3 is provided with a limit projection 33, and the other is provided with a limit groove 23, and the limit projection 33 cooperates with the limit groove 23 to limit the relative rotation of the support 2 and the sleeve 3.

As shown in fig. 11, the outer circumferential surface of the support 2 is formed with an inwardly concave limit groove 23, the outer circumferential surface of the sleeve 3 is formed with an inwardly convex limit projection 33, and the limit groove 23 and the limit projection 33 are engaged to position the support 2 and the sleeve 3. By restricting the relative rotation of the support 2 and the sleeve 3, the first through hole 22 is prevented from being displaced, ensuring that the flow guide passage 4 and the central passage 21 communicate.

Alternatively, as shown in connection with fig. 7, the position of the limit groove 23 is provided at one end of the support 2 so as to observe whether the limit projection 33 is located in the limit groove 23.

Alternatively, as shown in connection with fig. 11, the surface of the limit projection 33 is spherical so as to enter the limit groove 23.

Referring again to fig. 4, according to some embodiments of the present application, the electrode assembly 1 includes a first tab 11 at a first end 1a and a second tab 12 at a second end 1b, the first tab 11 and the second tab 12 being opposite in polarity. The battery cell 102 further comprises a housing assembly 5, the housing assembly 5 comprises a first electrode lead-out part 52 and a second electrode lead-out part 53 for inputting or outputting electric energy, the electrode assembly 1 is arranged in the housing assembly 5, the first electrode lead-out part 52 and the second electrode lead-out part 53 are arranged on one side, close to the first electrode lug 11, of the housing assembly 5, the first electrode lead-out part 52 is electrically connected with the first electrode lug 11, and the supporting piece 2 is used for connecting the second electrode lug 12 with the second electrode lead-out part 53 so as to realize the electrical connection of the second electrode lug 12 with the second electrode lead-out part 53.

The first pole piece, the second pole piece and the separator are in the prior art, although not shown in the drawings in the specification of the application, and the specific structure thereof is understood by those skilled in the art. The first tab 11 is a portion of the first pole piece that is not coated with an active material layer, and the second tab 12 is a portion of the second pole piece that is not coated with an active material layer. The first tab 11 and the second tab 12 may protrude from the same side of the electrode assembly 1, or may extend from opposite sides, respectively. Illustratively, as shown in fig. 4, the first tab 11 and the second tab 12 are disposed at two ends of the electrode assembly 1, respectively, that is, the first tab 11 is located at the first end 1a of the electrode assembly 1 and the second tab 12 is located at the second end 1b of the electrode assembly 1.

The case assembly 5 includes a case body 51, and the inside of the case body 51 forms a space for accommodating the electrode assembly 1. The shape of the case body 51 may be determined according to the specific shape of the electrode assembly 1. For example, if the electrode assembly 1 has a cylindrical structure, the case body 51 may be selected to be a cylindrical case; if the electrode assembly 1 has a rectangular parallelepiped structure, the case body 51 may be a rectangular parallelepiped case. Illustratively, the electrode assembly 1 and the case body 51 are both cylindrical.

In some embodiments, as shown in fig. 4, the casing body 51 may be a cylindrical structure with one end open and one end closed, the first electrode lead-out portion 52 is an end cover, the end cover closes the opening of the casing body 51, and the second electrode lead-out portion 53 is disposed on the end cover in an insulating manner.

The first electrode lead-out portion 52 and the second electrode lead-out portion 53 are both members of the battery cell 102 for inputting and outputting electric energy. The first electrode lead-out portion 52 is for connecting the first tab 11 and an external bus member, and the second electrode lead-out portion 53 is for connecting the second tab 12 and an external bus member.

As can be seen from fig. 4, the second electrode tab 12 is located at the second end 1b of the electrode assembly 1, the second electrode lead-out portion 53 is located at the first end 1a of the electrode assembly 1, one end of the supporting member 2 is connected to the second electrode tab 12, the other end of the supporting member 2 is connected to the second electrode lead-out portion 53, and the supporting member 2 transmits electric energy between the second electrode tab 12 and the second electrode lead-out portion 53, thereby electrically connecting the second electrode tab 12 and the second electrode lead-out portion 53. The supporting piece 2 has both the function of circulation and the function of electric connection, and an electric connection part is not required to be additionally arranged in the battery cell 102, so that the energy density of the battery cell 102 is ensured, the housing body 51 is not required to be electrified, and the safety of the battery cell 102 is improved.

According to some embodiments of the present application, as shown in fig. 4 and 12, the second electrode lead-out portion 53 is provided with a liquid filling hole 531, and the liquid filling hole 531 is disposed opposite to one end of the support member 2.

In some embodiments, as shown in fig. 12, the liquid injection hole 531 includes a first section, a second section, and a third section, the first section, the second section, and the third section are sequentially connected, the diameters of the first section, the second section, and the third section sequentially decrease, and the third section is close to the inside of the battery cell 102 with respect to the first section. The support 2 extends out of the sleeve 3 and to the third section, and the outer peripheral surface of the support 2 is bonded to and connected with the inner peripheral surface of the third section by bonding or butt welding.

The battery cell 102 further includes a sealing member 532, the sealing member 532 is disposed on the third section, and an outer peripheral surface of the sealing member 532 is bonded and connected with an inner peripheral surface of the third section, wherein the connection manner may be bonding or butt welding. The side of the seal 532 facing away from the inside of the battery cell 102 serves to enlarge the end face of the second electrode lead-out portion 53, facilitating connection to an external bus member. For example, the second electrode lead 53 and the reflow member may be electrically connected by soldering the bus member to the seal 532.

When the battery cell 102 needs to be injected, formed and then sealed before leaving the factory, the electrolyte enters the central channel 21 of the support 2 through the injection hole 531 and flows from the other end of the central channel 21 to the second end 1b of the electrode assembly 1, and enters the diversion channel 4 from the first through hole 22 to flow to the first end 1a and the second end 1b of the electrode assembly 1, so that the electrolyte fills the battery cell 102 and effectively infiltrates the electrode assembly 1.

In the case of filling, if the electrolyte in the central passage 21 overflows, the second section of the filling hole 531 can hold the overflowed electrolyte, preventing the electrolyte from flowing out to pollute the housing assembly 5. After the liquid injection hole 531 is closed, the connection position of the sealing member 532 and the third section is far away from the second section, and the electrolyte does not corrode the connection position of the sealing member 532 and the third section, so that the tightness of the battery cell 102 is improved.

In other embodiments, the end surface of the end of the second electrode lead-out portion 53 located inside the battery cell 102 abuts against the end surface of the support member 2, and the end surface are bonded, welded or in contact with each other, so that the liquid injection hole 531 penetrates to the area of the end surface of the second electrode lead-out portion 53, where the area contacts with the support member 2, and the diameter of the liquid injection hole 531 may be greater than the diameter of the central channel 21 or less than the diameter of the central channel 21.

In the above technical solution, the liquid injection hole 531 on the first electrode lead-out portion 52 is opposite to the support member 2, so that the liquid is injected through the support member 2, which is beneficial to the electrolyte flowing to the other end of the electrode assembly 1, and the infiltration efficiency of the electrolyte is improved.

According to some embodiments of the present application, as shown in fig. 4 and 13, the housing assembly 5 further comprises a pressure relief mechanism 54, the pressure relief mechanism 54 being configured to be actuated to release the internal pressure of the battery cell 102 when the internal pressure or temperature of the battery cell 102 reaches a threshold value, the pressure relief mechanism 54 being provided on a side of the housing assembly 5 close to the second tab 12 and opposite to the other end of the support 2.

Pressure relief mechanism 54 refers to an element or component that actuates to relieve the internal pressure or temperature of battery 100 cells when the internal pressure or temperature reaches a predetermined threshold. The threshold design varies according to design requirements. The threshold may depend on the material of one or more of the positive electrode tab, the negative electrode tab, the electrolyte, and the separator in the battery cell 102. The pressure release mechanism 54 may take the form of, for example, an explosion-proof valve, a gas valve, a pressure release valve, or a safety valve, and may specifically take the form of a pressure-sensitive or temperature-sensitive element or structure, i.e., when the internal pressure or temperature of the battery cell 102 reaches a predetermined threshold, the pressure release mechanism 54 performs an action or a weak structure provided in the pressure release mechanism 54 is broken, thereby forming an opening or passage through which the internal pressure or temperature can be released.

The term "actuated" as used herein refers to the pressure relief mechanism 54 being actuated or activated to a state such that the internal pressure and temperature of the battery cell 102 is relieved. The actions generated by pressure relief mechanism 54 may include, but are not limited to: at least a portion of the pressure relief mechanism 54 breaks, tears, opens, etc. Upon actuation of the pressure relief mechanism 54, the high temperature, high pressure material within the battery cell 102 may be expelled as a vent outwardly from the location of actuation. In this way, the pressure and temperature of the battery cells 102 can be vented and warmed under controlled pressure or temperature conditions, thereby avoiding potentially more serious accidents. References in the present application to emissions from the battery cell 102 include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of a separation membrane, high-temperature and high-pressure gas generated by reaction, flame and the like.

Through setting up relief mechanism 54 at the other end of support 2, the emission can reach relief mechanism 54 through central passageway 21 and water conservancy diversion passageway 4, and the discharge route is short, discharge speed is fast to because central passageway 21 and water conservancy diversion passageway 4 are difficult to block up, guaranteed that the emission can flow to relief mechanism 54 discharge, improved the security of battery monomer 102.

On the other hand, even if one of the center passage 21 and the diversion passage 4 is blocked, it is possible to discharge through the other, avoiding the blocking from causing local high pressure. For example, when the central passage 21 is blocked, the diversion passage 4 can be used for circulation, and the discharged matter is not accumulated near the pressure release mechanism 54 (near the second end 1b in the figure), so that the excessive internal pressure near the pressure release mechanism 54 is prevented to open the valve in advance; similarly, the exhaust is not accumulated near the first end 1a, and the valve is prevented from being opened due to excessive internal pressure near the first end 1a, so that the battery cell 102 is effectively prevented from being opened at a position other than the pressure release mechanism 54. The above technical scheme can ensure that the internal pressure of the battery cell 102 is uniform, thereby ensuring the normal use of the battery cell 102, prolonging the service life and improving the safety.

According to some embodiments of the application, the sleeve 3 is made of an insulating material.

Because the sleeve 3 is made of insulating materials, the sleeve 3 has the effect of insulating and isolating the support piece 2 and the electrode assembly 1, prevents the support piece 2 from being in contact with pole pieces with opposite polarities of the electrode assembly 1 to cause short circuit, and improves the safety of the battery cell 102.

According to some embodiments of the present application, as shown in fig. 14, the battery 100 cell further includes a current collector 6, and the current collector 6 is attached to the second tab 12 and is used to connect the second tab 12 and the support 2 to achieve electrical connection of the second tab 12 and the support 2.

The current collector 6 is a member for connecting the second electrode tab 12 and the support 2, and the current collector 6 and the support 2 effect the transfer of electric energy from the electrode assembly 1 to the second electrode lead-out portion 53. The current collector 6 has a flat plate structure, the current collector 6 covers the end face of the second lug 12, and a through hole is formed at a position of the current collector 6 corresponding to the central channel 21 to allow the electrolyte to circulate.

By providing the current collector 6, the area of the current collector 6 is larger, so that the electrical connection area between the support 2 and the second lug 12 can be increased, the overcurrent capacity can be improved, and the electrical connection reliability between the support 2 and the second lug 12 can be improved. By providing the current collector 6, the support 2 is also conveniently electrically connected with the second lug 12, and the connection efficiency is improved.

Referring to fig. 4 and 14 again, a flow channel 61 is disposed on a surface of the current collector 6 facing the electrode assembly 1, the flow channel 61 extends from an edge of the current collector 6 to a middle portion of the current collector 6, so that the electrolyte flowing out of the central channel 21 can flow from the edge to the middle portion of the flow channel 61, and the electrolyte flowing out of the current guide channel 4 can flow from the middle portion to the edge, and by disposing the flow channel 61, the electrolyte flow can be further facilitated, so that the inside of the battery cell 102 is filled with the electrolyte more rapidly, and the infiltration rate and the infiltration effect are improved.

Referring to fig. 14 again, the portion of the current collector 6 where the support 2 is not connected is also provided with through holes for allowing the electrolyte to flow to the electrode assembly 1 and also allowing the high-temperature and high-pressure exhaust generated in the electrode assembly 1 to flow to the pressure release mechanism 54, so that the impregnation effect can be improved and the safety of the battery cells 102 can be improved.

According to some embodiments of the application, as shown in fig. 14, the support 2 is provided with a fusing portion 24.

The fusing part 24 refers to a part of the battery cell 102 for breaking when the current is excessively high or the temperature is excessively high, so as to prevent the battery cell 102 from being charged and discharged continuously, which may cause more serious accidents. In the present embodiment, the fusing part 24 refers to the smallest part of the radial cross section of the support member 2 so that the overcurrent area of the support member 2 at the fusing part 24 is minimized, and when the current is excessively large, the fusing part 24 fuses first.

In some embodiments, as shown in fig. 15 and 16, the outer peripheral surface of the support member 2 is recessed inward to form an annular groove such that the radial cross section of the support member 2 is smallest where the annular groove is provided, that is, the fusing part 24 is a portion of the support member 2 where the annular groove is provided.

In other embodiments, as shown in fig. 17, the side wall of the support member 2 is provided with a plurality of through holes circumferentially spaced at a position in the axial direction, by which the radial cross section of the support member 2 is minimized at the position. Alternatively, the plurality of through holes may be used as the first through holes 22.

The highest temperature part of the electrode assembly 1 is usually at the center part, that is, the position close to the winding center hole, when the temperature or the current is too high, the fusing part 24 is disconnected, and the support 2 cannot realize the electrical connection between the second electrode tab 12 and the second electrode lead-out part 53, so that the battery cell 102 cannot continue to charge and discharge, so as to avoid serious accidents and improve the safety of the battery cell 102.

According to some embodiments of the present application, as shown in fig. 17, the second through hole 31 provided on the side wall of the sleeve 3 is offset from the fusing part 24.

The second through holes 31 and the fuse portion 24 may be offset in the axial direction of the support 2, may be offset in the circumferential direction of the support 2, or the second through holes 31 and the fuse portion 24 may be offset in both the axial direction of the support 2 and the circumferential direction of the support 2.

By staggering the fusing part 24 and the second through hole 31, the metal slag generated by fusing the supporting piece 2 is prevented from penetrating through the second through hole 31 to puncture the isolating piece and the pole piece, so that pole piece lap short circuit with opposite polarity is prevented from being caused, the supporting piece 2 and pole piece lap short circuit with opposite polarity to the supporting piece 2 are prevented from being caused, and the safety of the battery cell 102 is improved.

In some embodiments, as shown in fig. 17 and 18, the second through hole 31 may also be configured to be offset from the first through hole 22, the second through hole 31 may be offset from the first through hole 22 in the axial direction of the support 2, may be offset from the support 2 in the circumferential direction, or the second through hole 31 may be offset from the first through hole 22 in both the axial direction of the support 2 and the circumferential direction of the support 2. The first through holes 22 and the second through holes 31 are staggered, so that electrolyte is prevented from flowing out of the first through holes 22 and then directly impacting the inner wall of the winding center hole through the second through holes 31, and the pole piece is prevented from being damaged or wrinkled due to overlarge impact force.

In a second aspect, an embodiment of the present application provides a battery 100, as shown in fig. 2, where the battery 100 includes at least one battery cell 102 described in the above aspects. The battery 100 provided by the embodiment of the application has the advantages that the electrolyte wettability of the battery monomer 102 is good, so that the battery 100 has good cycle performance, high discharge capacity, long service life and good safety.

In a third aspect, an embodiment of the present application provides an electric device, which may be, but is not limited to, the vehicle 1000 shown in fig. 1, where the electric device includes the battery 100 described above. The battery 100 of the electric equipment has good cycle performance, high discharge capacity, long service life and good safety, so that the electric equipment has good performance and high safety.

In a fourth aspect, an embodiment of the present application provides a method for manufacturing a battery cell 102, as shown in fig. 19, including:

s1, providing an electrode assembly 1, the electrode assembly 1 having a winding central hole extending from a first end 1a to a second end 1b of the electrode assembly 1;

s2, providing a support 2, wherein the support 2 is tubular;

s3, providing a sleeve 3;

s4, sleeving the sleeve 3 on the support piece 2 so as to define a flow guide channel 4 between the inner peripheral surface of the sleeve 3 and the outer peripheral surface of the support piece 2, and penetrating the support piece 2 and the sleeve 3 into the winding center hole so as to enable the support piece 2 to support the electrode assembly 1 through the sleeve 3 and enable the flow guide channel 4 to extend from the first end 1a to the second end 1b.

It should be noted that, regarding the structure of the battery cell 102 manufactured by the manufacturing method of the battery cell 102, reference may be made to the battery cell 102 provided in each of the foregoing embodiments.

In assembling the battery cell 102 based on the above-described manufacturing method of the battery cell 102, the steps need not be sequentially performed, that is, the steps may be performed in the order mentioned in the embodiment, the steps may be performed in a different order from the order mentioned in the embodiment, or several steps may be simultaneously performed. For example, steps S1, S2, S3 may be executed simultaneously without being executed sequentially.

In a fifth aspect, an embodiment of the present application provides a manufacturing apparatus 7 of a battery cell 102, as shown in fig. 20, the manufacturing apparatus 7 including a first providing device 71, a second providing device 72, a third providing device 73, and an assembling device 74.

The first supply means 71 is for supplying the electrode assembly 1, and the electrode assembly 1 has a winding center hole extending from a first end 1a to a second end 1b of the electrode assembly 1.

The second providing device 72 is used for providing the support 2, and the support 2 is tubular.

The third providing means 73 are for providing the sleeve 3.

And an assembling device 74 for sleeving the sleeve 3 on the support 2 so that a flow guide channel 4 is defined between the inner circumferential surface of the sleeve 3 and the outer circumferential surface of the support 2, and for penetrating the support 2 and the sleeve 3 through the winding center hole so that the support 2 supports the electrode assembly 1 through the sleeve 3 and the flow guide channel 4 extends from the first end 1a to the second end 1b.

The relevant structure of the battery cell 102 manufactured by the manufacturing apparatus 7 described above can be seen from the battery cell 102 provided in the above embodiments.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

Referring to fig. 3-18, according to some embodiments of the present application, a cylindrical battery cell 102 is provided, wherein the battery cell 102 includes a housing assembly 5, an electrode assembly 1, a support 2, and a sleeve 3. The housing assembly 5 includes a housing body 51, a first electrode lead-out portion 52, a second electrode lead-out portion 53 and a pressure relief mechanism 54, wherein the housing body 51 is a cylindrical structure with one end open and one end closed, the first electrode lead-out portion 52 is an end cover covering the open end of the housing body 51, the second electrode lead-out portion 53 is arranged on the first electrode lead-out portion 52 in an insulating manner, and the pressure relief mechanism 54 is arranged at the closed end of the housing body 51. The electrode assembly 1, the support 2 and the sleeve 3 are all disposed within the case assembly 5. The electrode assembly 1 has opposite first and second ends 1a and 1b, the first end 1a facing the first electrode lead-out 52 and the second end 1b facing away from the first electrode lead-out 52, a winding center hole of the electrode assembly 1 extends from the first end 1a to the second end 1b, and the electrode assembly 1 has a first tab 11 protruding from the first end 1a and a second tab 12 protruding from the second end 1 b. The first electrode lead 52 is electrically connected to the first tab 11. The support 2 is made of a conductive material (such as a metal material) with a harder texture, and the sleeve 3 is made of an insulating material (such as a plastic material) with high temperature resistance. The support 2 and the sleeve 3 are both tubular, the support 2 is arranged in the winding center hole of the electrode assembly 1 in a penetrating manner, the sleeve 3 is sleeved on the support 2, and the sleeve 3 is positioned between the outer peripheral surface of the support 2 and the inner wall of the winding center hole, so that the support 2 supports the electrode assembly 1 through the sleeve 3, and the winding center Kong Takong of the electrode assembly 1 is prevented. Meanwhile, one end of the support member 2 is connected to the second electrode tab 12, and the other point of the support member 2 is connected to the second electrode lead-out portion 53, so that the second electrode tab 12 and the second electrode lead-out portion 53 are electrically connected. The inner space of the tubular supporting member 2 forms a central channel 21, a diversion channel 4 is defined between the inner peripheral surface of the sleeve 3 and the outer peripheral surface of the supporting member 2, the central channel 21 and the diversion channel 4 extend from the first end 1a to the second end 1b, the central channel 21 and the diversion channel 4 are both used for allowing electrolyte to flow, when one of the two channels is blocked, the other channel can allow the electrolyte to flow, the inner space of the winding central hole is prevented from being completely blocked, the electrolyte can be uniformly distributed in the battery cell 102, the wettability of the electrolyte is improved, and thus the cycle performance, the discharge capacity and the service life of the battery 100 are improved, meanwhile, the central channel 21 and the diversion channel 4 can also be used for allowing gas to circulate, so that the pressure in the battery cell 102 is kept uniform, the problems of damage and thermal runaway caused by overlarge local internal pressure and overhigh local temperature are prevented, and the safety of the battery 100 is improved.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

A battery cell, comprising:

an electrode assembly having a winding center hole extending from a first end to a second end of the electrode assembly;

the support piece is tubular and penetrates through the winding center hole;

a sleeve sleeved on the support member and located between an outer circumferential surface of the support member and an inner wall of the winding center hole, the support member being configured to support the electrode assembly through the sleeve;

wherein a flow guide channel is defined between the inner peripheral surface of the sleeve and the outer peripheral surface of the support member, the flow guide channel extending from the first end to the second end.
The battery cell according to claim 1, wherein a first through hole is provided on a side wall of the support member, the first through hole being for communicating an inner space of the support member with the flow guide passage.
The battery cell of claim 2, wherein the number of the flow guide channels is plural, and the plurality of flow guide channels are spaced apart along the circumference of the support member.
The battery cell according to claim 3, wherein each of the flow guide channels communicates with the inner space of the support member through a plurality of the first through holes disposed at intervals along the extending direction thereof.
The battery cell according to any one of claims 2-4, wherein the outer circumferential surface of the support member is a cylindrical surface, the inner circumferential surface of the sleeve is a prismatic surface, the outer circumferential surface of the support member is tangential to the inner circumferential surface of the sleeve, and the flow guide channel is formed between two adjacent tangential lines.
The battery cell according to claim 5, wherein the first through hole has a diameter D1, the support has an outer diameter D2, and the number of edges of the inner circumferential surface of the sleeve is n, satisfying:

sin5°≤D1/D2≤sin(360°/2n)。
the battery cell according to any one of claims 2 to 4, wherein the outer peripheral surface of the support member is prismatic, the inner peripheral surface of the sleeve is cylindrical, and an edge of the outer peripheral surface of the support member abuts against the inner peripheral surface of the sleeve.
The battery cell according to any one of claims 2-7, wherein a second through hole is provided in a side wall of the sleeve, the second through hole being in communication with the flow guide channel.
The battery cell of claim 8, wherein the second through-hole has a diameter that is smaller than a diameter of the first through-hole.
The battery cell according to claim 8 or 9, wherein the battery cell further comprises a buffer member having a mesh structure and covering the second through hole.
The battery cell according to any one of claims 1 to 10, wherein one of an outer peripheral surface of the support member and an inner peripheral surface of the sleeve is provided with a limit projection, and the other is provided with a limit groove, the limit projection being engaged with the limit groove to limit relative rotation of the support member and the sleeve.
The battery cell of any one of claims 1-11, wherein the electrode assembly comprises a first tab at the first end and a second tab at the second end, the first tab and the second tab being of opposite polarity;

the battery cell further includes:

the shell assembly comprises a first electrode leading-out part and a second electrode leading-out part, wherein the first electrode leading-out part and the second electrode leading-out part are used for inputting or outputting electric energy, the electrode assembly is arranged in the shell assembly, the first electrode leading-out part and the second electrode leading-out part are all arranged on one side, close to the first electrode lug, of the shell assembly, the first electrode leading-out part is electrically connected with the first electrode lug, and the supporting piece is used for connecting the second electrode lug with the second electrode leading-out part so as to realize the electrical connection of the second electrode lug with the second electrode leading-out part.
The battery cell according to claim 12, wherein the second electrode lead-out portion is provided with a liquid filling hole provided opposite to one end of the support member.
The battery cell of claim 13, wherein the housing assembly further comprises a pressure relief mechanism configured to actuate to relieve the internal pressure of the battery cell when the internal pressure or temperature of the battery cell reaches a threshold, the pressure relief mechanism disposed on a side of the housing assembly proximate the second tab and opposite the other end of the support.
The battery cell of any of claims 12-14, wherein the sleeve is made of an insulating material.
The battery cell of any of claims 12-15, wherein the battery cell further comprises: a current collector attached to the second tab and adapted to connect the second tab and the support to make electrical connection of the second tab and the support.
The battery cell according to any one of claims 12-16, wherein the support is provided with a fusing portion.
The battery cell of claim 17, wherein a second through hole is provided in a sidewall of the sleeve, the second through hole being in communication with the flow channel, the fuse being offset from the second through hole.
A battery comprising the battery cell of any one of claims 1-18.
A powered device comprising the battery of claim 19.
A method of manufacturing a battery cell, comprising:

providing an electrode assembly having a winding central bore extending from a first end to a second end of the electrode assembly;

providing a support, the support being tubular;

providing a sleeve;

the sleeve is sleeved on the supporting piece, so that a flow guide channel is defined between the inner peripheral surface of the sleeve and the outer peripheral surface of the supporting piece, the supporting piece and the sleeve penetrate through the winding center hole, the supporting piece supports the electrode assembly through the sleeve, and the flow guide channel extends from the first end to the second end.
A manufacturing apparatus of a battery cell, comprising:

a first providing means for providing an electrode assembly having a winding center hole extending from a first end to a second end of the electrode assembly;

a second providing device for providing a support, the support being tubular;

Third providing means for providing a sleeve;

the assembly device is used for sleeving the sleeve on the support piece so as to limit a flow guide channel between the inner peripheral surface of the sleeve and the outer peripheral surface of the support piece, and is used for penetrating the support piece and the sleeve into the winding center hole so as to enable the support piece to support the electrode assembly through the sleeve, and enable the flow guide channel to extend from the first end to the second end.