CN221352910U - Top cover, battery and electricity utilization device - Google Patents

Abstract

The utility model provides a top cover, a battery and an electricity utilization device, and relates to the technical field of batteries, wherein the top cover comprises a top plate, a heat conducting piece and a heat radiating piece, the top plate comprises an inner wall opposite to a battery core and an outer wall deviating from the battery core, and a heat radiating hole penetrating the top plate from the inner wall to the outer wall is formed in the top cover; the heat conducting piece is arranged between the inner wall and the battery cell; the heat dissipation piece is inserted and is established in the louvre, the bottom and the heat conduction piece of heat dissipation piece are connected, the junction sealing treatment of heat dissipation piece and louvre, the heat conduction piece sets up between roof and electric core, can contact with the connection piece, thereby the junction with utmost point ear and connection piece and the heat of junction of utmost point post and connection piece spread out, the heat carries out heat exchange by the air outside heat dissipation piece and the battery, thereby realize heat transfer and heat dissipation, the utmost point ear of avoiding the battery and connection piece junction and the temperature of utmost point post and connection piece junction are too high.

Description

Top cover, battery and electricity utilization device

Technical Field

The utility model relates to the technical field of batteries, in particular to a top cover, a battery and an electric device.

Background

Secondary batteries, also called rechargeable batteries or secondary batteries, are batteries that can be used continuously by activating active materials by charging after the battery is discharged.

When the secondary battery is charged quickly, a large amount of heat is generated in the battery, wherein places with larger heat productivity are mainly concentrated at the connection positions of the lugs and the connection pieces, the connection positions and the top cover are mutually separated, under the structure, the heat at the connection positions is difficult to transfer to the top cover, heat cannot be dissipated through the top cover, and the temperature of the lugs and the connection pieces of the secondary battery are easy to cause.

Disclosure of utility model

The utility model aims to provide a top cover so as to solve the technical problems that in the prior art, the heat productivity at the junction of a tab and a connecting piece and the junction of a pole and the connecting piece is large, heat cannot be dissipated through the top cover, and the temperature is easy to be too high.

The utility model provides a top cover, which comprises a top plate, a heat conducting piece and a heat radiating piece; the top plate comprises an inner wall opposite to the battery cell and an outer wall deviating from the battery cell, a heat dissipation hole is formed in the top plate, and the heat dissipation hole penetrates through the top plate from the inner wall to the outer wall; the heat conducting piece is arranged between the inner wall and the battery cell; the heat dissipation piece is inserted into the heat dissipation hole, the bottom of the heat dissipation piece is connected with the heat conduction piece, and the joint of the heat dissipation piece and the heat dissipation hole is sealed.

Further, the heat dissipation holes and the heat dissipation pieces are multiple; the heat dissipation holes are arranged on the top plate at intervals, the heat dissipation pieces and the heat dissipation holes are arranged in one-to-one correspondence, and the heat dissipation pieces are connected with the heat conduction pieces.

Further, the heat conductive member includes a heat conductive plate; the radiating piece is a radiating fin; the heat radiating fins are arranged in parallel and are vertically connected with the heat conducting plate.

Further, a heat conducting cavity is arranged in the heat conducting piece; and cooling liquid is arranged in the heat conduction cavity.

Further, a capillary network is arranged on the side wall, close to the battery cell, of the heat conducting cavity; the volume of the cooling liquid is smaller than that of the heat conducting cavity.

Further, the capillary network, the heat dissipation member and the heat conduction member are made of copper.

Further, a sealing ring is arranged in the radiating hole; the heat dissipation piece is inserted into the sealing ring, and the outer wall of the heat dissipation piece is matched with the sealing ring.

Further, an insulating layer is arranged on the surface, facing away from the top plate, of the heat conducting piece.

The beneficial effects are that:

The heat conducting piece is arranged between the top plate and the electric core, and the position can be contacted with the connecting piece, so that heat at the joint of the electrode lug and the connecting piece and at the joint of the electrode post and the connecting piece is transmitted, after the heat radiating piece is connected with the heat conducting piece, the heat is conducted to the heat radiating piece by the heat conducting piece, and heat exchange is carried out between the heat radiating piece and air outside the battery, so that heat transfer and heat radiation at the joint of the electrode lug and the connecting piece and the joint of the electrode post and the connecting piece are realized, and overhigh temperature is avoided.

The utility model also aims to provide a battery which comprises a shell, an electric core and the top cover; the housing has an opening; the battery cell is accommodated in the shell; the top cover is buckled with the opening of the shell; the heat conducting piece of the top cover is arranged between the top plate of the top cover and the battery cell.

In addition, the utility model also provides an electric device which comprises the battery.

The battery and the electricity utilization device provided by the utility model both comprise the provided top cover, so that the battery and the electricity utilization device provided by the utility model both have the beneficial effects of the top cover and are not repeated herein.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic front view of a top cover according to an embodiment of the present utility model;

FIG. 2 is a schematic top view of a top cover according to an embodiment of the present utility model;

Fig. 3 is a schematic top view of a top cover according to an embodiment of the utility model.

Icon:

100-top plate; 110-a sealing ring;

200-a heat conducting piece; 210-a heat conducting cavity; 211-capillary network;

300-a heat sink;

400-pole; 410-connection piece.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically 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 utility model will be understood in specific cases by those of ordinary skill in the art.

The utility model will now be described in further detail with reference to specific examples thereof in connection with the accompanying drawings.

As shown in fig. 1 to 3, the top cover provided in this embodiment includes a top plate 100, a heat conductive member 200, and a heat dissipation member 300. The top plate 100 is used for covering and establishes at the battery top, and the top plate 100 includes the inner wall opposite with the electric core and deviates from the outer wall of electric core, has seted up the louvre on the top plate 100, and the louvre pierces through the top plate 100 from inner wall to outer wall. The heat conducting member 200 is disposed between the inner wall and the battery cell. The heat dissipation element 300 is inserted in the heat dissipation hole, the bottom of the heat dissipation element 300 is connected with the heat conduction element 200, and the connection part of the heat dissipation hole of the heat dissipation element 300 is sealed.

Specifically, the top cover provided in this embodiment is assembled to the battery, the tab of the existing battery is connected to the post 400 through the connecting piece 410, the heat conducting member 200 is disposed between the top plate 100 and the battery cell, and this position can be contacted with the connecting piece 410, so that the heat at the junction between the tab and the connecting piece 410 and the junction between the post 400 and the connecting piece 410 is transferred, after the heat dissipating member 300 is connected to the heat conducting member 200, the heat is conducted to the heat dissipating member 300 by the heat conducting member 200, and the heat is exchanged with the air outside the battery by the heat dissipating member 300, so that the heat transfer and heat dissipation at the junction between the tab and the connecting piece 410 and the junction between the connecting piece 410 and the post 400 are realized, and the overhigh temperature is avoided.

When the battery is charged quickly, the place with larger heating value is mainly concentrated at the connection part of the lug of the battery core and the connection part of the connection piece 410 and the pole 400, and in the prior art, in order to avoid the short circuit of the contact between the top cover and the battery core, a plastic part is usually stuck on the lower surface of the top cover, therefore, the two connection parts and the top cover are usually separated by the plastic part, and the heat generated at the connection part is difficult to be transferred to the top cover, so that the condition that the local temperature of the battery is too high easily occurs.

In the top cover provided in this embodiment, the heat conducting member 200 is disposed between the inner wall of the top plate 100 and the battery cell, and the heat conducting member 200 contacts with the two connection points, so that the heat conducting member 200 can exchange heat with the two connection points, and the heat can be conducted into the heat conducting member 200 and conducted by the heat conducting member 200 to the heat dissipating member 300 to dissipate heat, thereby reducing the temperature at the connection point between the tab and the connection piece 410 and the connection point between the tab 400 and the connection piece 410 in the battery.

It can be appreciated that the tab of the battery may be directly connected to the pole 400, i.e. the connection member may be omitted, and at this time, since the conductive member of the present embodiment may also contact the tab and/or the pole, the heat conductive member 200 may be capable of dissipating heat from the tab and the pole, including dissipating heat from the tab and the pole itself, and dissipating heat from the connection portion between the tab and the pole.

In this embodiment, there are a plurality of heat dissipation holes and heat dissipation elements 300. The plurality of heat dissipation holes are arranged on the top plate 100 at intervals, the plurality of heat dissipation elements 300 are arranged in one-to-one correspondence with the plurality of heat dissipation holes, and the plurality of heat dissipation elements 300 are connected with the heat conduction element 200.

The heat dissipation member 300 has a function of exchanging heat with air, and the larger the number of the heat dissipation members 300 is, the larger the heat dissipation area is, the higher the heat dissipation efficiency is, and the faster the heat dissipation speed is. Under the structure that a plurality of radiating pieces 300 set up at intervals, leave the heat dissipation space between two adjacent radiating pieces 300, can be convenient for radiating piece 300 and air carry out the heat exchange, avoid the heat unable rapid dispersion to the air in radiating piece 300.

In the present embodiment, the heat conductive member 200 includes a heat conductive plate. The heat sink 300 is a heat sink. The heat dissipation fins are arranged in parallel and are vertically connected to the heat conduction plate.

Specifically, the heat conducting member 200 in this embodiment is a heat conducting plate with a straight plate structure, and when the top cover and the battery are assembled, the heat conducting plate can be directly placed between the battery cell and the top plate 100 without occupying excessive height space in the battery. And the radiating fins penetrate out of the battery from the radiating holes on the top plate 100, only the connection part with the heat conducting plate is positioned in the battery, the space utilization rate of the height of the battery core is not affected, the structure is ingenious, and the heat dissipation of the battery core can be realized while the total volume of the battery is not increased.

The heat dissipation fin is a passive heat dissipation element, specifically, the heat dissipation fin in the embodiment is of a cuboid structure and is perpendicular to the heat conduction plate, and the contact area between the heat dissipation fin and air is large, so that the heat dissipation fin and the air are high in heat exchange efficiency, and the effect of rapid heat dissipation can be achieved.

Specifically, in this embodiment, the length and width of the top plate 100 and the heat conducting plate are the same, and the thickness of the heat conducting plate is 1mm-5mm, so that under the structure that the total height of the battery is not affected, the contact area between the heat conducting plate and the connecting sheet 410 is maximized, the heating area of the heat conducting plate is maximized, the heating and heat transfer speeds of the heat conducting plate are further improved, and the heat dissipation efficiency of the top cover is improved.

As an implementation manner, the thickness of the heat conducting plate can be 5mm at maximum, and the larger the thickness of the heat conducting plate is, the more convenient the heat conduction is, and the specific thickness can be selected according to the internal space structures of different batteries.

It should be noted that, the number of fins should be selected according to the size and specification of the battery, for example, the top plate 100 has a length a, a width B, a height C, and a fin thickness h2, and then the number of fins n2 should be greater than 1 and less than or equal to a/2h2, where n2 is an integer.

On the other hand, the number of heat radiating holes is the same as the number of heat radiating fins. Under this structure, the interval between a plurality of fin is enough to realize quick heat dissipation, and each fin does not influence each other to, realized in limited space as far as possible promote the purpose of the radiating volume of fin.

In addition, the plurality of heat dissipation holes on the top plate 100 should be distributed at equal intervals, and correspondingly, the plurality of heat dissipation fins and the plurality of heat dissipation holes are in one-to-one correspondence, and are also distributed at equal intervals, so that the heat dissipation fins above the battery cells are uniformly distributed, and uniform heat dissipation of the battery cells is realized.

In the present embodiment, the heat conductive member 200 is provided therein with a heat conductive cavity 210. The heat conduction cavity 210 is provided with a cooling liquid.

The cooling liquid in the heat conducting cavity 210 is used for conducting heat, and the heat absorbed by the side, close to the battery cell, of the heat conducting piece 200 is quickly conducted to the side, provided with the radiating fins, of the heat conducting piece 200, so that the heat can be quickly conducted to the radiating fins, and the radiating fins exchange heat with air, so that quick heat dissipation is realized.

In this embodiment, a capillary network 211 is disposed on a side wall of the heat conducting cavity 210 near the battery cell. The volume of the cooling fluid is less than the volume of the heat conducting cavity 210.

The heat is conducted to the heat conducting cavity 210, and the cooling liquid in the heat conducting cavity 210 is sucked into the meshes of the capillary network 211 under the action of the capillary network 211, and the cooling liquid is gasified after absorbing the heat. Because the temperature of the side wall of the heat conducting cavity 210 provided with the cooling fin is lower, the gasified cooling liquid moves to the side wall provided with the cooling fin under the action of air pressure, the gasified cooling liquid is condensed after contacting with the reduced temperature of the side wall, and heat is conducted to the side wall provided with the cooling fin from the gasified cooling liquid. The heat is conducted to the heat radiating fins by the side walls of the heat conducting cavity 210 and is subjected to heat exchange with the external air, and the condensed cooling liquid is sucked into the mesh holes again under the action of the capillary force of the capillary network 211, so that the repeated gasification and condensation circulation of the cooling liquid is realized, and the heat at the joint of the tab and the connecting piece 410 and the joint of the tab 400 and the connecting piece 410 is conducted to the heat radiating fins to be dispersed, and the heat radiating effect of the battery is further improved.

Wherein capillary network 211 is capable of generating capillary forces upon contact with a fluid, thereby drawing a cooling fluid into the mesh of capillary network 211. In particular, the liquid surface of the fluid resembles a tensioned rubber membrane, which tends to flatten out if the liquid surface is curved. The meniscus thus exerts a pulling force on the underlying liquid and the meniscus exerts a pressing force on the underlying liquid. The liquid level of the immersion fluid in the capillary tube is concave, and the immersion fluid exerts a pulling force on the liquid below, so that the liquid rises along the tube wall, and when the upward pulling force is equal to the gravity of the liquid column in the tube, the liquid in the tube stops rising to reach balance. The same analysis can also explain the phenomenon that the non-wetting liquid descends in the capillary. The capillary mesh in this embodiment can be seen as a structure in which a plurality of capillaries are united to form an integral structure.

In addition, in this embodiment, the cooling liquid is injected into the heat conducting cavity 210 by pumping negative pressure, so that the sealing property of the heat conducting cavity 210 is not damaged, and the leakage of the cooling liquid during use is avoided.

In this embodiment, the coolant is methanol. The boiling point temperature of the methanol is lower than 64.7 ℃, the methanol can be gasified when heated, the heat dissipation efficiency is higher, and the manufacturing cost is lower.

In addition, the cooling liquid can also adopt liquid with lower boiling points such as ammonia, water, acetone and the like, and can realize the effects of gasification, liquefaction and backflow, thereby realizing effective heat dissipation.

In this embodiment, the capillary network 211, the heat dissipation member 300 and the heat conduction member 200 are made of copper.

The copper metal has good ductility and high thermal conductivity and electrical conductivity, in the embodiment, the excellent thermal conductivity of the copper metal is mainly utilized, so that the heat on the side wall of the heat conducting cavity 210 can be quickly conducted out, the phenomenon that the heat on the side wall of the heat conducting cavity 210 cannot be quickly conducted out by the capillary network 211 is avoided, and the heat cannot be quickly conducted into the cooling liquid to gasify the cooling liquid is avoided.

The heat conductive member 200 and the heat sink may be made of a metal material having excellent heat conductive properties such as stainless steel or aluminum alloy, and the same technical effects can be achieved.

Specifically, in this embodiment, the capillary network 211 has a network diameter of 1 μm to 100 μm, and the fine network can form denser capillaries, thereby having stronger capillary force so as to suck the condensed coolant.

In order to reduce the processing difficulty, the diameter of the capillary network 211 may be 100 μm at the maximum, so that a sufficient capillary force can be generated, and the production difficulty is low. When the volume of the battery is large and the space between the top plate 100 and the battery cell is large, the volume of the heat conductive member 200 should be scaled.

In this embodiment, a seal ring 110 is disposed in the heat dissipation hole. The heat sink 300 is inserted into the sealing ring 110, and the outer wall of the heat sink 300 is adapted to the sealing ring 110.

The gasket 110 can fill the gap between the heat sink and the heat sink, and maintain the sealed state inside the battery. Specifically, the heat sink and the sealing ring 110 in the embodiment are assembled in an interference manner, so that a gap between the sealing ring 110 and the heat sink can be avoided.

In the present embodiment, the surface of the heat conductive member 200 facing away from the top plate 100 is provided with an insulating layer. Further, an insulating layer may be provided on the surface of the heat sink 300.

One surface of the heat conducting piece 200, which is far away from the top plate 100, is contacted with the battery cell, and the insulating layer can avoid the short circuit phenomenon between the heat conducting piece 200 and the battery cell, so that the heat conducting piece 200 of the embodiment can cancel the existing plastic piece. Similarly, the heat dissipation element 300 is exposed outside the battery and is located at the same side as the pole 400, and the insulating layer can avoid the short circuit phenomenon between the heat dissipation element 300 and the pole 400.

The battery provided by the embodiment comprises a shell, an electric core and a top cover. The shell is provided with an opening; the battery cell is accommodated in the shell; the top cover is buckled with the opening of the shell; wherein, the heat conduction member 200 of the top cover is arranged between the top plate 100 of the top cover and the battery cell. One side of the battery cell of the embodiment is extended with a tab, the pole 400 is penetrated through the top cover, and one end of the pole 400 is connected with the tab through a connecting sheet 410. The top cover is provided with a mounting hole of the pole 400, and the other end of the pole 400 passes through the mounting hole and out of the top cover. The heat conducting member 200 of the top cover is disposed between the top plate 100 of the top cover and the battery cell, and the connecting sheet 410 is attached to the heat conducting member 200.

The electricity utilization device provided by the embodiment comprises the battery provided by the embodiment.

The battery supplies power to the power utilization device. The electric device may take various forms, such as a mobile phone, a portable device, a notebook computer, a battery car, an electric car, a ship, a spacecraft, an electric toy, an electric tool, or various home appliances, etc. For example, spacecraft include airplanes, rockets, space shuttles, spacecraft, and the like. The electric toy includes a fixed or mobile electric 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.

The battery and the electricity utilization device provided by the utility model both comprise the provided top cover, so that the battery and the electricity utilization device provided by the utility model both have the beneficial effects of the top cover and are not repeated herein.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the technical solutions according to the embodiments of the present utility model.

Claims (10)

1. A top cap, comprising:

The top plate (100), the top plate (100) comprises an inner wall opposite to the battery cell and an outer wall deviating from the battery cell, the top plate (100) is provided with a heat dissipation hole, and the heat dissipation hole penetrates through the top plate (100) from the inner wall to the outer wall;

A heat conducting member (200) provided between the inner wall and the battery cell;

The heat dissipation piece (300) is inserted into the heat dissipation hole, the bottom of the heat dissipation piece (300) is connected with the heat conduction piece (200), and the joint of the heat dissipation piece (300) and the heat dissipation hole is subjected to sealing treatment.

2. The header according to claim 1, wherein said heat dissipating holes and said heat dissipating member (300) are each plural;

a plurality of heat dissipation holes are arranged on the top plate (100) at intervals,

The heat dissipation parts (300) are arranged in one-to-one correspondence with the heat dissipation holes, and the heat dissipation parts (300) are connected with the heat conduction parts (200).

3. The header according to claim 2, wherein said heat conductive member (200) comprises a heat conductive plate;

The heat dissipation piece (300) is a heat dissipation sheet;

The heat radiating fins are arranged in parallel and are vertically connected with the heat conducting plate.

4. The top cover according to claim 1, characterized in that a heat conducting cavity (210) is provided in the heat conducting member (200);

and cooling liquid is arranged in the heat conducting cavity (210).

5. The top cover according to claim 4, wherein a capillary network (211) is arranged on a side wall of the heat conducting cavity (210) close to the battery cell;

the volume of the cooling fluid is smaller than the volume of the heat conducting cavity (210).

6. The top cover according to claim 5, wherein the capillary network (211), the heat sink (300) and the heat conducting member (200) are made of copper.

7. The top cover according to claim 1, wherein a sealing ring (110) is arranged in the heat dissipation hole;

The heat dissipation piece (300) is inserted into the sealing ring (110), and the outer wall of the heat dissipation piece (300) is matched with the sealing ring (110).

8. The top cover according to claim 1, characterized in that the surface of the heat-conducting element (200) facing away from the top plate (100) is provided with an insulating layer.

9. A battery comprising a housing, a cell, and a cap according to any one of claims 1-8;

The housing has an opening;

The battery cell is accommodated in the shell;

The top cover is buckled with the opening of the shell;

The heat conducting piece (200) of the top cover is arranged between the top plate (100) of the top cover and the battery cell.

10. An electrical device comprising the battery of claim 9.