CN215299343U

CN215299343U - High-capacity battery with good heat dissipation performance

Info

Publication number: CN215299343U
Application number: CN202121032950.4U
Authority: CN
Inventors: 郑高锋; 雷政军; 翟腾飞; 刘毅; 张三学
Original assignee: Shaanxi Olympus Power Energy Co Ltd
Current assignee: Shaanxi Olympus Power Energy Co Ltd
Priority date: 2021-05-14
Filing date: 2021-05-14
Publication date: 2021-12-24
Anticipated expiration: 2031-05-14

Abstract

The embodiment of the application discloses good heat dissipation's large capacity battery, this battery include the casing, set up two at least electric cores in this casing and set up in the cooling structure between these two at least electric cores. Wherein, this cooling structure includes: heat conduction unit and M heat pipes, this M heat pipe all are connected with heat conduction unit, and this M heat pipe and two at least electricity core laminating, this heat conduction unit are connected with the inboard of casing, and M is for being greater than 1 positive integer. The embodiment of the application provides a high-capacity battery with good heat dissipation performance, and can solve the problem that the high-capacity lithium battery is low in heat dissipation efficiency in the using process.

Description

High-capacity battery with good heat dissipation performance

Technical Field

The embodiment of the application relates to the technical field of electrical components, in particular to a high-capacity battery with good heat dissipation performance.

Background

The lithium battery is a high-capacity battery with high energy density and wide application range and good heat dissipation, the performance of the lithium battery is greatly influenced by the internal temperature of the battery, the aging of the lithium battery can be accelerated by overhigh temperature, even thermal runaway occurs, the internal resistance is increased by overlow temperature, the charging and discharging efficiency is reduced, and the capacity is attenuated. Generally, the lithium battery can be cooled by air cooling, liquid cooling, phase change material addition, heat pipe cooling and other modes.

However, the lithium battery is cooled by air cooling, liquid cooling, phase change material addition, heat pipe cooling and the like, so that the heat dissipation efficiency of the heat dissipation method is low.

Disclosure of Invention

The embodiment of the application provides a high-capacity battery with good heat dissipation performance, and can solve the problem that the heat dissipation efficiency is low in the use process of a lithium battery.

In order to solve the technical problem, the embodiment of the application adopts the following technical scheme:

in a first aspect of the embodiments of the present application, a high capacity battery with good heat dissipation performance is provided, where the battery includes a casing, at least two battery cells disposed in the casing, and a cooling structure disposed between the at least two battery cells. Wherein, this cooling structure includes: heat conduction unit and M heat pipes, this M heat pipe all are connected with heat conduction unit, and this M heat pipe and two at least electricity core laminating, this heat conduction unit are connected with the inboard of casing, and M is for being greater than 1 positive integer.

In an embodiment of the present application, a battery includes a casing, at least two battery cells disposed in the casing, and a cooling structure disposed between the at least two battery cells; wherein, cooling structure includes: heat conduction unit and M root heat pipes, M root heat pipes all are connected with heat conduction unit, and M root heat pipes and two at least electric core laminating, heat conduction unit are connected with the inboard of casing, and M is for being greater than 1 positive integer. In this application embodiment, distribute heat pipe whole inside the battery, need not stretch out the casing, through the reasonable setting to the quantity and the position of heat pipe, make distribute in the inside heat pipe of battery concentrate on the inside one or several heat conduction unit of battery, the battery passes on the heat conduction unit by the heat pipe at the heat that the charge-discharge in-process produced. The heat conducting unit is tightly attached to the inner wall of the shell, the heat radiating unit is arranged outside the battery shell corresponding to the heat conducting unit, and heat of the heat conducting unit can be directly taken away through the heat radiating unit, so that the temperature of the heat pipe in the battery is reduced due to the temperature reduction of the heat conducting unit, and the purpose of radiating the inside of the battery is achieved.

Drawings

Fig. 1 is a schematic structural diagram of a battery provided in an embodiment of the present application;

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

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

fig. 4 is a fourth schematic structural diagram of a battery according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first" and "second," and the like, in the description and in the claims of the embodiments of the present application are used for distinguishing between different objects and not for describing a particular order of the objects. In the description of the embodiments of the present application, the meaning of "a plurality" means two or more unless otherwise specified. In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

The lithium battery is a high-capacity battery with high energy density and wide application range and good heat dissipation, the performance of the lithium battery is greatly influenced by the internal temperature of the battery, the aging of the lithium battery can be accelerated by overhigh temperature, even thermal runaway occurs, the internal resistance is increased by overlow temperature, the charging and discharging efficiency is reduced, and the capacity is attenuated.

In the related art, the research on the heat dissipation structure of a lithium battery, especially a high-capacity lithium battery, is more, and the mainstream method is to obtain a heat dissipation structure which can effectively save the space of the battery by means of air cooling, liquid cooling, addition of a phase change material, heat pipe cooling and the like, which is a research focus in the field of heat dissipation of the lithium battery at present.

The heat pipe consists of a pipe shell, a liquid absorption core and an end cover. The interior of the heat pipe is pumped into a negative pressure state and filled with proper liquid, and the liquid has a low boiling point and is easy to volatilize. The tube wall has a wick that is constructed of a capillary porous material. When one end of the heat pipe is heated, the liquid in the capillary tube is quickly vaporized, the vapor flows to the other end under the power of heat diffusion, the vapor is condensed at the cold end to release heat, and the liquid flows back to the evaporation end along the porous material by the capillary action, so that the circulation is not stopped until the temperatures of the two ends of the heat pipe are equal (at the moment, the heat diffusion of the vapor is stopped). This cycle is rapid and heat can be conducted away from the heat source.

The present invention provides a high-capacity battery with good heat dissipation performance, which is described in detail below with reference to the accompanying drawings.

The battery provided by the embodiment of the application includes a casing 10, at least two battery cells 11 disposed in the casing 10, and a cooling structure 12 disposed between the at least two battery cells 11.

Wherein, cooling structure 12 includes: heat conduction unit and M heat pipes, M heat pipes all are connected with heat conduction unit, and M heat pipes and two at least electric core 11 laminating, heat conduction unit and casing 10's inboard are connected, and M is for being greater than 1 positive integer.

Optionally, in this embodiment of the application, the X battery cells may specifically be: x laminated cells. Each laminated battery cell in the X laminated battery cells is connected with two laminated battery cells in the X laminated battery cells respectively.

Optionally, in this embodiment of the application, as shown in fig. 1, the at least two battery cells 11 include: the battery comprises a first battery cell 13 and a second battery cell 14, wherein the second battery cell 14 is sleeved outside the first battery cell 13; n heat pipes 15 in the M heat pipes are arranged between the first battery cell 13 and the second battery cell 14, and the M-N heat pipes 16 are arranged outside the second battery cell 14.

As shown in fig. 2, the M-N heat pipes 16 are: among the M heat pipes, N is a positive integer less than or equal to M except the N heat pipes 15.

Optionally, in this embodiment of the application, the heat conducting unit may specifically be: a metal heat conducting block.

It can be understood that, in the embodiment of the present application, the battery is a circular high-capacity lithium battery structure, and is formed by 2 concentric cylindrical battery cores, a gap of 3mm is left between two wound cylindrical battery cores, N heat pipes 15 (for example, 3L-shaped heat pipes) are inserted into the gap, and one end of each of the N heat pipes 15 is inserted into the heat conducting unit. 3L-shaped heat pipes (namely M-N heat pipes 16) are also placed on the outer wall of the outermost part of the battery cell, which is tightly attached to the second battery cell 14, one ends of the M-N heat pipes 16 are also inserted into the centralized heat conducting unit, the heat conducting unit is tightly attached to the inner side of the shell 10, and heat conducting insulating glue is smeared among the M heat pipes, the first battery cell 13 and the second battery cell 14. The heat that the battery produced in the use is followed the heat pipe by the M that inserts in the electricity core and is conducted to heat conduction unit, and heat conduction unit hugs closely with battery case, sets up the radiating element on the battery case that heat conduction unit corresponds, and radiating element can take away the heat in the heat conduction unit like this to make heat conduction unit's temperature reduce, heat conduction unit temperature reduction arouses M heat pipe temperature to reduce, makes the temperature reduction of whole battery core, has reached the radiating purpose to this large capacity lithium cell.

Optionally, in an embodiment of the present application, the at least two battery cells include: the battery comprises X battery cells, X is a positive integer, and X is a positive integer; m root heat pipes include: q first heat pipes and R second heat pipes, Q, R are positive integers.

Wherein, Q first heat pipes and the laminating of X electric core, Q first heat pipes and the laminating of R second heat pipes, R second heat pipes and the laminating of X electric core, every second heat pipe all is connected with heat conduction unit.

Optionally, in this embodiment of the application, with reference to fig. 1, as shown in fig. 3, the battery is a large-capacity laminated lithium battery structure, X battery cells 22 are a battery core group formed by 3 laminated battery cells, Q first heat pipes 18 (i.e., two heat bars) are disposed between three laminated battery cells, the periphery of each heat bar extends out of the laminated battery cell by 2mm, part of the R second heat pipes 19 (e.g., 3L-shaped heat pipes) are disposed at tabs 20 at two ends of the battery cell, the top ends of the 3L-shaped heat pipes are inserted into the heat conducting unit at the upper portion, and one side surface of each of the 3L-shaped heat pipes is tightly attached to the end surface of the Q first heat pipes 18 in the middle of the battery cell, and the other side surface of each of the 3L-shaped heat pipes is tightly attached to the tab and the side surface of the battery cell. And an insulating heat-conducting fin is arranged on a contact surface which needs to be contacted with the heat pipe and needs to be insulated between the battery core and the heat pipe. The heat generated by the battery core in the use process of the large-capacity battery is conducted to the second heat pipe 19 through the first heat pipe 18(2 heat rows), and then conducted to the heat conducting unit through the second heat pipe 19; the heat generated by the tabs of the battery can be directly conducted to the heat conducting unit by the second heat pipe 19, and the heat radiating unit arranged outside the battery shell corresponding to the heat conducting unit can conduct away the heat of the heat conducting unit, so that the temperature of the battery is reduced.

Optionally, in this embodiment of the application, with reference to fig. 1, as shown in fig. 4, each of the Q first heat pipes 21 is a U-shaped heat pipe; wherein, Q first heat pipes 21 evenly distributed is in the different sides of X electric core 22, and every second heat pipe all laminates with Q first heat pipes 21, X electric core 22, and every second heat pipe all is connected with heat conduction unit.

It can be understood that, in this embodiment of the application, the battery is a large-capacity laminated lithium battery structure, X battery cells 22 are a battery core group formed by 3 laminated battery cells, a part of the Q first heat pipes 21 (for example, 9U-shaped heat pipes) are placed between the three laminated battery cells, the U-shaped heat pipes are distributed at the bottom of each layer of battery cell in 3 groups, and the side faces of the battery core group are tightly attached to the side faces. 2 lugs of the electric core group, the copper bar 23 and the aluminum bar 24 are distributed with partial first heat pipes (such as 6 horizontally placed U-shaped heat pipes) in the Q first heat pipes 21 and partial second heat pipes (such as 6L-shaped heat pipes) in the R second heat pipes 25, wherein the 6L-shaped heat pipes are connected with the U-shaped heat pipes and concentrate heat on 2 heat conducting blocks distributed on the upper part of the battery. Lap-welded connections are made at the mutually poorer joints of the heat pipes. And an insulating heat conducting sheet is arranged on a contact surface which needs to be contacted with the heat pipe and needs to be insulated of the electric core group.

Optionally, in this embodiment of the present application, each of the M heat pipes is a hollow tubular structure, and each heat pipe is filled with copper foam.

Optionally, in this embodiment of the application, a heat conduction layer is disposed between each heat pipe of the M heat pipes and the at least two battery cells.

Further alternatively, in the embodiment of the present application, the heat conducting layer may be specifically a heat sink.

Further optionally, in this embodiment of the application, the heat conductive layer may specifically be a heat conductive insulating plastic layer.

Optionally, in this embodiment of the application, a heat dissipation unit is further disposed on the outer side of the housing.

Further optionally, in this embodiment of the application, the heat dissipation unit may specifically be one or any combination of a heat dissipation fin, a semiconductor cooling fin, a heat dissipation fan, and the like.

Optionally, in this embodiment of the application, a projection of the heat dissipation unit on the housing coincides with a projection of the heat conduction unit on the housing.

The refrigeration piece is distributed at the position corresponding to the heat conduction unit outside the shell, so that the heat of the heat conduction unit can be rapidly conducted out, and the heat dissipation effect is further improved.

The heat dissipation path of the large-capacity battery can be thought of as heat is conducted from the first heat pipe 21 to the second heat pipe 25 and then conducted from the second heat pipe 25 to the heat conduction unit, the heat conduction unit is closely attached to the inner side of the upper cover of the battery, the semiconductor refrigeration sheet is arranged outside the upper cover of the battery, and the semiconductor refrigeration sheet and the heat conduction unit are overlapped in the projection direction, so that the heat can be conducted from the heat conduction unit to the semiconductor cooling fin and then dissipated outside the battery through the semiconductor cooling fin, and the purpose of cooling the inside of the whole battery is achieved.

The battery provided by the embodiment of the application comprises a shell, at least two battery cells arranged in the shell and a cooling structure arranged between the at least two battery cells; wherein, cooling structure includes: heat conduction unit and M root heat pipes, M root heat pipes all are connected with heat conduction unit, and M root heat pipes and two at least electric core laminating, heat conduction unit are connected with the inboard of casing, and M is for being greater than 1 positive integer. In this application embodiment, distribute heat pipe whole inside the battery, need not stretch out the casing, through the reasonable setting to the quantity and the position of heat pipe, make distribute in the inside heat pipe of battery concentrate on the inside one or several heat conduction unit of battery, the battery passes on the heat conduction unit by the heat pipe at the heat that the charge-discharge in-process produced. The heat conducting unit is tightly attached to the inner wall of the shell, the heat radiating unit is arranged outside the battery shell corresponding to the heat conducting unit, and heat of the heat conducting unit can be directly taken away through the heat radiating unit, so that the temperature of the heat pipe in the battery is reduced due to the temperature reduction of the heat conducting unit, and the purpose of radiating the inside of the battery is achieved.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A high-capacity battery with good heat dissipation performance is characterized by comprising a shell, at least two battery cells arranged in the shell, and a cooling structure arranged between the at least two battery cells;

wherein the cooling structure includes: the battery shell comprises a heat conduction unit and M heat pipes, wherein the M heat pipes are connected with the heat conduction unit, the M heat pipes are attached to the at least two battery cores, the heat conduction unit is connected with the inner side of the shell, and M is a positive integer greater than 1.

2. The battery of claim 1, wherein the at least two cells comprise: the battery comprises a first battery cell and a second battery cell, wherein the second battery cell is sleeved outside the first battery cell;

n heat pipes of the M heat pipes are arranged between the first battery cell and the second battery cell, and the M-N heat pipes are arranged on the outer side of the second battery cell;

wherein, the M-N heat pipes are as follows: and N is a positive integer less than or equal to M in the heat pipes except the N heat pipes.

3. The battery of claim 1, wherein the at least two cells comprise: the battery comprises X battery cells, X is a positive integer, and X is a positive integer;

the M heat pipes include: q first heat pipes and R second heat pipes, Q, R are positive integers;

the Q first heat pipes are attached to the X battery cores, the Q first heat pipes are attached to the R second heat pipes, the R second heat pipes are attached to the X battery cores, and each second heat pipe is connected with the heat conduction unit.

4. The battery of claim 3, wherein each of the Q first heat pipes is a loop heat pipe;

each first heat pipe is arranged in the X battery cells and between two adjacent battery cells, each second heat pipe is attached to the Q first heat pipes and the X battery cells, and each second heat pipe is connected with the heat conduction unit.

5. The battery of claim 3, wherein each of the Q first heat pipes is a U-shaped heat pipe;

the Q first heat pipes are uniformly distributed on different sides of the X battery cores, each second heat pipe is attached to the Q first heat pipes and the X battery cores, and each second heat pipe is connected with the heat conduction unit.

6. The battery of claim 1, wherein each of the M heat pipes is a hollow tubular structure, and each heat pipe is filled with copper foam.

7. The battery of claim 1, wherein a thermally conductive layer is disposed between each of the M heat pipes and the at least two cells.

8. The battery of claim 7, wherein the thermally conductive layer is a heat sink.

9. The battery of claim 7, wherein the thermally conductive layer is a thermally conductive and insulating plastic layer.

10. The battery according to claim 1, wherein a heat dissipation unit is further provided on an outer side of the case.

11. The battery of claim 10, comprising at least one of: cooling fan, radiating fin, semiconductor refrigeration piece.

12. The battery of claim 11, wherein a projection of the heat dissipating unit on the housing coincides with a projection of the heat conducting unit on the housing.