CN224232885U - Heat dissipation composite tab structure of lithium cobaltate battery - Google Patents

Abstract

This utility model relates to the field of battery technology, specifically to a heat-dissipating composite tab structure for a lithium cobalt oxide battery. It is mounted on a cell assembly containing several cells, each with two terminals. The structure includes an insulating support, a thermally conductive element, and a liquid-cooled heat sink. The insulating support is mounted on the cell assembly and has two conductive plates. Each conductive plate has several connecting tabs, and all connecting tabs on each conductive plate are electrically connected to the corresponding terminals on the cell. The thermally conductive element is attached to the conductive plates and all connecting tabs. The liquid-cooled heat sink is attached to the side of the thermally conductive element away from the insulating support, and has thermally conductive fins on both sides, completely covering the thermally conductive element and with their edges engaged with the insulating support. This heat-dissipating composite tab structure for a lithium cobalt oxide battery has a compact overall structure and good heat dissipation.

Description

Heat dissipation composite tab structure of lithium cobaltate battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a heat dissipation composite tab structure of a lithium cobalt oxide battery.

Background

Lithium cobaltate batteries have high specific capacity and outstanding comprehensive performance, but have poor thermal stability and very high cost, and are mainly used in equipment with long endurance in consumer markets, such as smart phones, tablets, notebook computers, digital cameras and portable medical equipment.

The lithium cobaltate battery generally consists of a plurality of electric cores which are connected in parallel or in series, the lug of each electric core is connected on one conductor in a welding mode to form a total lug, and each lithium cobaltate battery is provided with two total lugs which are actually the positive and negative poles of the lithium cobaltate battery for discharging outwards. Because the lithium cobaltate battery can release heat outwards in the process of charging and discharging, and each battery cell is welded and connected between the electrode lug and the conductive piece, the texture of the region is uneven, meanwhile, the cross section area of the electrode lug is small, and when the current of the whole battery cell is conducted, the temperature of the battery cell in the electrode lug region is easily led to be obviously higher than that of the battery cell body region. Under the condition, the temperature of the lug of each cell is different, when the lithium cobaltate battery is wholly discharged outwards, the situation easily causes the current of each cell to be uneven, partial cells can be accelerated and attenuated, and finally the lithium cobaltate battery is caused to fail prematurely, so that the service life and the working efficiency of the whole lithium cobaltate battery are greatly influenced by the too high temperature of the lug of each cell.

For such situations, the current mainstream practice is to set a heat dissipation structure inside a lithium cobaltate battery, the heat dissipation structure directly dissipates heat of all the battery cells, so that normal operation of each battery cell is guaranteed, for example, a patent CN 202210197372.2-direct cooling type battery pack heat management device and a heat management system based on tab heat dissipation are disclosed, in the patent, heat inside the battery cell is rapidly led out through a tab heat dissipation mode, the heat dissipation efficiency of the battery cell can be greatly improved, the temperature gradient inside the battery cell is reduced, but in the patent, the whole structure needs to be provided with a plurality of cooling pipelines, the structure is complex, the structure occupies a plurality of spaces inside the battery, the energy density in the unit volume of the battery can be reduced, and therefore, a composite tab structure with compact structure and good heat dissipation effect is needed to be designed to connect each battery cell, and the normal transportation and heat dissipation functions of electric energy inside the whole battery are guaranteed.

Disclosure of utility model

In order to overcome one of the defects in the prior art, the utility model aims to provide the heat dissipation composite tab structure of the lithium cobalt oxide battery, which has compact overall structure and good heat dissipation effect.

In order to solve the problems, the technical scheme adopted by the utility model is as follows:

The utility model provides a lithium cobaltate battery's compound utmost point ear structure of heat dissipation, installs on electric core group, be provided with a plurality of electric cores in the electric core group, the electric core has two utmost point posts, including insulating support, heat conduction spare and liquid cooling radiating member, the insulating support sets up on the electric core group, be provided with two electrically conductive pole pieces on the insulating support, every all be provided with a plurality of connection utmost point ears on the electrically conductive pole piece, every all on the electrically conductive pole piece the connection utmost point ear respectively with all the electric property's of corresponding connection utmost point post one-to-one electricity is connected on the electric core, the laminating of heat conduction spare is in electrically conductive pole piece and all on the connection utmost point ear, the laminating of liquid cooling radiating member is in on the heat conduction spare is kept away from on one side of insulating support, the both sides of liquid cooling radiating member are provided with heat conducting fin, heat conducting fin covers completely on the heat conduction spare and the edge with insulating support joint.

Further, the liquid cooling heat dissipation piece is flat flexible body and one end is sealed, the inside baffle that is provided with of liquid cooling heat dissipation piece, the baffle will liquid cooling heat dissipation piece internal partition becomes drain channel and feed liquor passageway, the feed liquor passageway is located the below of drain channel, the drain channel with the feed liquor passageway is in liquid cooling heat dissipation piece confined one end intercommunication, the side that corresponds one side of heat conduction piece with the liquid cooling heat dissipation piece is located the laminating of the outer wall in feed liquor passageway place region, two the heat conduction fin sets up respectively in the liquid cooling heat dissipation piece is located on the both sides of feed liquor passageway.

Further, a plurality of guide plates are arranged in the liquid inlet channel.

Further, the side wall of the liquid cooling heat dissipation part, which is positioned at one side of the liquid inlet channel, is inwards recessed to form a containing area, and the partial area of the heat conduction part is arranged in the containing area and is respectively in heat conduction contact with the outer wall of the containing area.

Further, the conductive pole pieces are clamped and fixed on the insulating support, an elastic connection area is arranged between each connection lug and the corresponding conductive pole piece, and the connection lugs are bent and protruded to one side of the heat conducting piece.

Further, a connecting hole is formed in the connecting lug, the connecting hole is matched with a pole corresponding to the battery cell, and the inner wall of the connecting hole is connected with the outer wall of the pole through welding.

Further, the insulating support is provided with a containing groove for containing the conductive pole piece, at least one positioning column is arranged on the containing groove, a positioning hole matched with the positioning column is formed in the conductive pole piece, a step is arranged on an opening of the containing groove, the edge of the heat conducting fin is clamped on the step, and a avoiding hole for avoiding the pole column on the battery cell is formed in the containing groove.

Further, an isolation area is arranged between the two conductive pole pieces, and the insulating support is located between the two conductive pole pieces.

Further, the heat conducting device further comprises an insulating cover, wherein the insulating cover is fixed on the insulating support through screws, and the liquid cooling heat dissipation piece is pressed on the heat conducting piece through the insulating cover.

Further, the heat conducting piece is heat conducting silica gel.

Compared with the prior art, the utility model has the beneficial effects that:

According to the heat dissipation composite tab structure design insulating support of the lithium cobaltate battery, the insulating support is utilized to isolate the conductive pole piece and the shell of the battery cell, so that the short circuit of the conductive pole piece and the shell of the battery cell can be effectively avoided, and meanwhile, the effect of relatively fixing the battery cell and the conductive pole piece can be achieved. In addition, the conductive pole piece can be used for extending the poles of the plurality of electric cores besides being connected with the poles of the plurality of electric cores, so that rapid heat dissipation is realized, a heat conduction piece is designed between the conductive pole piece and the liquid cooling heat dissipation piece, and the effect of insulating heat conduction is realized, and the liquid cooling heat dissipation piece is attached to one side, far away from the insulating support, of the heat conduction piece. The heat conduction fins on two sides of the liquid cooling radiating piece are completely coated on the heat conduction piece, and the edges of the heat conduction fins are clamped with the insulating support, so that the heat on the insulating support can be directly absorbed to a certain extent besides the increased contact area, and meanwhile, the liquid cooling radiating piece, the heat conduction piece and the conductive pole piece can be always kept in close contact, and the cooling effect is guaranteed.

The utility model is described in further detail below with reference to the drawings and the detailed description.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is a partially exploded view of an embodiment of the present utility model;

FIG. 3 is a partial cross-sectional view of an embodiment of the present utility model;

fig. 4 is a cross-sectional view of a portion of another embodiment of the present utility model.

Reference numerals illustrate:

The battery cell group 10, the battery cell 11 and the pole 12;

The device comprises an insulating bracket 20, a containing groove 21, a positioning column 22, a step 23 and an isolation region 24;

a heat conductive member 30;

The liquid cooling radiator 40, the heat conducting fins 41, the partition plate 42, the liquid outlet channel 43, the liquid inlet channel 44 and the accommodating area 45;

The conductive pole piece 50, the connecting pole lug 51, the elastic connecting area 52, the connecting hole 53 and the positioning hole 54;

An insulating cover 60.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Referring to fig. 1 to 4, a heat dissipation composite tab structure of a lithium cobaltate battery is installed on a battery cell group 10, a plurality of battery cells 11 are disposed in the battery cell group 10, each battery cell 11 has two electrode posts 12, each battery cell comprises an insulation support 20, a heat conduction member 30 and a liquid cooling heat dissipation member 40, the insulation support 20 is disposed on the battery cell group 10, two conductive electrode plates 50 are disposed on the insulation support 20, each conductive electrode plate 50 is provided with a plurality of connection electrode tabs 51, all the connection electrode tabs 51 on each conductive electrode plate 50 are respectively connected with all the electrode posts 12 corresponding to the electric connection attributes on the battery cells 11 in a one-to-one manner, the heat conduction member 30 is attached to the conductive electrode plates 50 and all the connection electrode tabs 51, the liquid cooling heat dissipation member 40 is attached to one side of the heat conduction member 30 away from the insulation support 20, two sides of the liquid cooling heat dissipation member 40 are provided with heat conduction fins 41, the heat conduction fins 41 are completely covered on the heat conduction member 30, and edges of the heat conduction fins 41 are in clamping connection with the insulation support 20.

In particular, the cell stack 10 according to the application is designed in a flat manner as a whole, but also in an upright manner as a whole, which is arranged according to the actual use requirements. The application is not limited to the whole vertical design, and the design is suitable for the requirements of small volume and high energy density of unmanned aerial vehicles, digital cameras, small medical equipment and the like, and can be flat to adapt to the scene requirements of notebooks, flat plates and the like with high space requirements. The insulating support 20 has the main purpose of relatively fixing the conductive pole piece 50 and the battery core 11, ensuring the position fixing between the conductive pole piece 50 and the battery core, facilitating the close fitting of the heat conducting piece 30 with the pole 12 and the conductive pole piece 50, and ensuring the heat dissipation effect. It should be noted that, in practical applications, the battery cell 11 generates slight expansion deformation during use due to heat release, and therefore, the pole 12 is actually driven to displace, so that the insulating support 20 is necessary to be disposed.

In addition, the heat conducting member 30 is a heat conducting silica gel in the present application, and the liquid cooling heat dissipating member 40 may be a conventional flat heat dissipating copper tube or the like, and the structure is a conventional design in practice. The present application is not described in detail herein. The insulating support 20 is made of an insulating and heat conducting material, such as a heat conducting plastic, in the present application. In order to increase the heat dissipation effect, the heat conducting fins 41 are flexible metal sheets, preferably copper foil structures, which serve to completely encapsulate the heat conducting member 30 therein. In the present application, the two conductive electrode sheets 50 are respectively connected to the positive and negative electrodes of the battery 11. It is of course also possible to connect according to the actual requirements, for example whether the cell stack 10 is arranged in series or in parallel, for which reason the application is not described in detail here.

The heat dissipation composite tab structure of the lithium cobaltate battery is provided with the insulating support 20, and the insulating support 20 is utilized to isolate the shells of the conductive pole piece 50 and the battery cell 11, so that the short circuit of the shells of the conductive pole piece 50 and the battery cell 11 can be effectively avoided, and meanwhile, the effect of relatively fixing the battery cell 11 and the conductive pole piece 50 can be achieved. Besides the pole posts 12 connected with the plurality of battery cells 11, the conductive pole piece 50 can also serve as the extension of the pole posts 12 of the plurality of battery cells 11, so that rapid heat dissipation is realized, the heat conducting piece 30 is designed between the conductive pole piece 50 and the liquid cooling heat dissipation piece 40, the heat conducting piece 30 realizes the function of insulating heat conduction, the liquid cooling heat dissipation piece 40 is attached to one side of the heat conducting piece 30 far away from the insulating support 20, and the arrangement difficulty and the number of cooling pipelines can be reduced due to the structural arrangement, so that the whole structure is more compact. The heat conducting fins 41 on two sides of the liquid cooling radiating piece 40 are completely coated on the heat conducting piece 30, and the edges of the heat conducting fins are clamped with the insulating support 20, so that the heat on the insulating support 20 can be directly absorbed to a certain extent besides the increased contact area, and meanwhile, the liquid cooling radiating piece 40, the heat conducting piece 30 and the electric conduction pole piece 50 can be always kept in close contact, and the cooling effect is guaranteed.

Referring to fig. 1 to 3, in one embodiment of the present application, in order to better mount the conductive pole piece 50, the insulating support 20 is provided with a receiving groove 21 for receiving the conductive pole piece 50, the receiving groove 21 is provided with at least one positioning post 22, the conductive pole piece 50 is provided with a positioning hole 54 adapted to the positioning post 22, an opening of the receiving groove 21 is provided with a step 23, an edge of the heat conducting fin 41 is clamped on the step 23, and the receiving groove 21 is provided with a avoiding hole for avoiding the pole 12 on the battery cell 11. In the above embodiments, the whole battery pack 10 has a block structure instead of a flat structure, the battery cells 11 are longitudinally arranged, and the avoiding holes are arranged at the bottom of the accommodating groove 21, that is, the insulating support 20 is mounted on the top of the battery cells 11. In fact, in the present application, the conductive pole piece 50 can be clamped in the accommodating groove 21 through the cooperation of the positioning post 22 and the positioning hole 54, so that the later assembly difficulty is reduced. Wherein, the heat conduction fin 41 can cooperate the accommodation groove 21 to wrap the conductive pole piece 50 and the heat conduction piece 30, thereby improving the protection performance, increasing the contact area and improving the overall heat dissipation effect.

In the above embodiment, for better isolation, the insulating support 20 is provided with an isolation region 24 between the two conductive pole pieces 50. Also, to accommodate venting of the electrical core 11, the isolation region 24 may be provided with an integrated vent valve structure.

Referring to fig. 1 to 3, in one embodiment of the present application, for better cooling, while reducing the occupied space, the liquid cooling heat dissipation member 40 is a flat flexible tube and has one end closed, a partition plate 42 is disposed inside the liquid cooling heat dissipation member 40, the partition plate 42 divides the inside of the liquid cooling heat dissipation member 40 into a liquid outlet channel 43 and a liquid inlet channel 44, the liquid inlet channel 44 is located below the liquid outlet channel 43, the liquid outlet channel 43 is communicated with the liquid inlet channel 44 at the closed end of the liquid cooling heat dissipation member 40, the side surface of the corresponding side of the heat conduction member 30 is attached to the outer wall of the area where the liquid cooling heat dissipation member 40 is located where the liquid inlet channel 44 is located, and two heat conduction fins 41 are disposed on two sides of the liquid cooling heat dissipation member 40 where the liquid inlet channel 44 is located. The liquid inlet channel 44 is in the lower layer and directly contacts with the heat conducting member 30, so that the heat transferred by the heat conducting member 30 can be absorbed more rapidly by the structural design, and the heat absorbing effect is improved. The partition 42 is furthermore made of a heat insulating material, which reduces the heat exchange between the liquid outlet channel 43 and said liquid inlet channel 44. In addition, the flat design of the liquid cooling heat sink 40 can reduce the overall height of the structure, providing a design basis for the subsequent flat design of the cell stack 10. The outward ends of the liquid outlet channel 43 and the liquid inlet channel 44 are respectively communicated with an external liquid cooling system, and the external liquid cooling device simultaneously cools the liquid cooling heat dissipation elements 40 on the plurality of electric core groups 10. In order to be convenient for connect with outside liquid cooling system, be provided with the connection interface on the outside one end of drain channel 43 and feed liquor channel 44, the connection interface communicates with the interface of the business turn over liquid of outside liquid cooling system.

In addition, in order to reduce the flow velocity of the cooling liquid in the liquid inlet channel 44 and increase the heat exchange time, a plurality of baffles are arranged in the liquid inlet channel 44. Of course, in some embodiments, the baffle can also support the inlet channel 44 from deforming concave. Of course, in some embodiments, the liquid outlet channel 43 and the liquid inlet channel 44 may be designed with a plurality of liquid outlet channels, so as to ensure that the liquid outlet channel 43 and the liquid inlet channel 44 cannot influence the on-off of the cooling liquid due to bending, crimping and deformation.

Of course, in some modified embodiments, in order to avoid loosening of the liquid cooling heat dissipation element 40 relative to the heat conduction element 30, and ensure close contact between the two, a side wall of the liquid cooling heat dissipation element 40 located at one side of the liquid inlet channel 44 is recessed inwards to form a accommodating area 45, and a partial area of the heat conduction element 30 is disposed in the accommodating area 45 and is in heat conduction contact with an outer wall of the accommodating area 45 respectively.

Referring to fig. 1 to 3, in one embodiment of the present application, in order to adapt to the installation of the entire battery 11 and the clamping and fixing of the conductive tabs 50 on the insulating support 20 of the terminal 12, an elastic connection region 52 is provided between each connection tab 51 and the corresponding conductive tab 50, and the connection tab 51 is bent and protruded to one side of the heat conductive member 30. The practical function of the elastic connection area 52 is to adapt to the connection space requirement of the connection tab 51 and the pole 12, and meanwhile, the elastic connection area 52 can prevent the connection tab 51 from being directly attached to the accommodating groove 21, so that a certain space is reserved between the connection tab 51 and the accommodating groove, internal air circulation is facilitated, and the radiating effect is improved.

In the above embodiment, the connection tab 51 is provided with the connection hole 53, the connection hole 53 is adapted to the post 12 corresponding to the battery cell 11, and the inner wall of the connection hole 53 is connected with the outer wall of the post 12 by welding, so that the stable connection between the battery cell 11 and the connection tab 51 can be ensured by such a structural design, and meanwhile, the connection tab has enough operation space for welding, so as to avoid the occurrence of cold welding.

Referring to fig. 4, in one embodiment of the present application, the present application further includes an insulating cover 60, the insulating cover 60 is fixed to the insulating bracket 20 by screws, and the insulating cover 60 presses the liquid-cooled heat sink 40 against the heat conductive member 30. The insulating cover 60 mainly serves to protect the liquid cooling radiator 40, and may be used as a cover of the whole battery cell assembly 10 in some embodiments.

The above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.

Claims (10)

1. The utility model provides a lithium cobaltate battery's compound utmost point ear structure of heat dissipation, installs on the electricity core group, be provided with a plurality of electric cores in the electricity core group, the electricity core has two utmost point posts, its characterized in that, including insulating support, heat conduction spare and liquid cooling radiating member, the insulating support sets up on the electricity core group, be provided with two conductive pole pieces on the insulating support, every all be provided with a plurality of connection utmost point ears on the conductive pole piece, every all on the conductive pole piece the connection utmost point ear respectively with all the corresponding utmost point post one-to-one electricity of electric connection attribute on the electricity core is connected, the laminating of heat conduction spare is in on conductive pole piece and all on the connection utmost point ear, the laminating of liquid cooling radiating member is in on the heat conduction spare is kept away from on the one side of insulating support, the both sides of liquid cooling radiating member are provided with the heat conduction fin, the heat conduction fin covers completely on the heat conduction spare and the edge with insulating support joint.

2. The heat dissipation composite tab structure of a lithium cobaltate battery according to claim 1, wherein the liquid cooling heat dissipation member is a flat flexible pipe body and one end is closed, a partition plate is arranged in the liquid cooling heat dissipation member, the liquid cooling heat dissipation member is internally divided into a liquid outlet channel and a liquid inlet channel by the partition plate, the liquid inlet channel is positioned below the liquid outlet channel, the liquid outlet channel and the liquid inlet channel are communicated with one closed end of the liquid cooling heat dissipation member, the side surface of the corresponding side of the heat conduction member is attached to the outer wall of the area where the liquid cooling heat dissipation member is positioned, and two heat conduction fins are respectively arranged on two sides of the liquid cooling heat dissipation member positioned on the liquid inlet channel.

3. The heat dissipation composite tab structure of a lithium cobaltate battery as defined in claim 2, wherein a plurality of deflectors are arranged in the liquid inlet channel.

4. The heat dissipation composite tab structure of a lithium cobaltate battery as defined in claim 2, wherein the side wall of the liquid cooling heat dissipation member located at one side of the liquid inlet channel is recessed inwards to form a containing area, and the partial area of the heat conduction member is arranged in the containing area and is in heat conduction contact with the outer wall of the containing area respectively.

5. The heat dissipation composite tab structure of a lithium cobaltate battery as defined in claim 1, wherein the conductive tabs are fastened and fixed on the insulating support, an elastic connection area is provided between each connection tab and the corresponding conductive tab, and the connection tab is bent and protruded to one side of the heat conduction member.

6. The heat dissipation composite tab structure of a lithium cobaltate battery according to claim 1 or 5, wherein the connection tab is provided with a connection hole, the connection hole is adapted to a tab corresponding to the battery cell, and an inner wall of the connection hole is connected with an outer wall of the tab by welding.

7. The heat dissipation composite tab structure of a lithium cobaltate battery as defined in claim 1, wherein the insulating support is provided with a containing groove for containing a conductive pole piece, the containing groove is provided with at least one positioning column, the conductive pole piece is provided with a positioning hole matched with the positioning column, the opening of the containing groove is provided with a step, the edge of the heat conduction fin is clamped on the step, and the containing groove is provided with an avoidance hole for avoiding the pole on the battery cell.

8. The heat dissipation composite tab structure of a lithium cobaltate battery as defined in claim 1, wherein an isolation region is provided between the two conductive electrode plates by the insulating support.

9. The heat dissipation composite tab structure of a lithium cobaltate battery of claim 1 further comprising an insulating cover, wherein the insulating cover is fixed on the insulating bracket by a screw, and the insulating cover compresses the liquid cooling heat dissipation member on the heat conduction member.

10. The heat dissipation composite tab structure of a lithium cobaltate battery as defined in claim 1, wherein the heat conductive member is a heat conductive silica gel.