CN219716973U - Battery heat radiation structure and battery - Google Patents

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery heat dissipation structure and a battery. The battery heat dissipation structure comprises a package body and a heat dissipation sheet, wherein the package body is used for packaging a bare cell group of a battery; the radiating fin comprises a first part, a second part and a third part which are sequentially connected, the first part is positioned in the bare cell group, and the third part is clamped between an outer side surface of the bare cell group along a first direction and an inner side wall surface of the packaging body; the first direction is the thickness direction of the bare cell group; the second part is used for connecting the first part and the third part, and can conduct heat absorbed by the first part to the third part, and heat absorbed by the third part can be conducted to the packaging body. The heat dissipation structure of the battery can conduct out the heat in the battery, prevent the heat in the battery from gathering, and improve the service life and the use reliability of the battery.

Description

Battery heat radiation structure and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery heat dissipation structure and a battery.

Background

The traditional square aluminum shell lithium ion battery mainly diffuses the internal heat to the outside through the diaphragm and the pole piece units, and the diaphragm is made of materials with poor heat dissipation effects such as PP or PE, so that the internal heat dissipation effect of the battery is poor, and the internal heat accumulation of the battery is easily caused in the charge and discharge process.

The existing high-energy-density battery and large battery work and generate more heat, when no excellent heat dissipation structure exists, the heat in the battery cannot be timely conducted to the outside, so that the temperature in the battery is raised, the temperature gradient in the battery and the temperature gradient outside the battery are large, the aging of local materials in the battery can be accelerated after long-time use, the capacity attenuation of the battery is induced, and the risks such as thermal failure and the like can be caused under more serious conditions; and the higher the internal temperature of the battery is, the more active side reactions in the battery are caused, so that the degradation of an electrode active interface is accelerated, and the reliability of the battery is also deteriorated.

Disclosure of Invention

The utility model aims to provide a battery heat dissipation structure which can conduct heat in a battery, prevent heat in the battery from gathering and improve the service life and the service reliability of the battery.

To achieve the purpose, the utility model adopts the following technical scheme:

the battery heat dissipation structure comprises a package body and a heat dissipation fin, wherein the package body is used for packaging a bare cell group of a battery; the radiating fin comprises a first part, a second part and a third part which are sequentially connected, the first part is positioned in the bare cell group, and the third part is clamped between an outer side surface of the bare cell group along a first direction and an inner side wall surface of the packaging body; the first direction is the thickness direction of the bare cell group; the second portion is used for connecting the first portion and the third portion, and can conduct heat absorbed by the first portion to the third portion, and heat absorbed by the third portion can be conducted to the package body.

Optionally, the heat sink is made of a PET composite copper foil or a copper foil material, and an insulating layer is disposed at a contact position of the heat sink and the bare cell group.

Optionally, the insulating layer is a gap-coated ceramic layer or an attached insulating tape layer.

Optionally, the bare cell group includes two bare cell monomers, and each bare cell monomer is provided with the radiating fin.

Optionally, the heat dissipation fin is integrally formed, the second portion is located on at least one side surface of the bare cell group along a second direction or at least one side surface of the bare cell group along a third direction, the second direction is a width direction of the bare cell group, the third direction is a length direction of the bare cell group, and the first direction, the second direction and the third direction are perpendicular to each other.

Optionally, the bare cell group includes at least two bare cell monomers, the bare cell monomers are stacked, and the first portion is disposed between every two adjacent bare cell monomers.

Optionally, two third portions are provided, and the two third portions are respectively sandwiched between the two outermost bare cell monomers and the package body.

Optionally, a gap between the edge of the heat sink and the edge of the bare cell group is A, and A is more than or equal to 2mm and less than or equal to 10mm.

Optionally, the package body includes an insulating film and a package shell, and the insulating film is covered inside the package shell.

Another object of the present utility model is to provide a battery, which includes a bare cell group and a battery heat dissipation structure as described in any one of the above aspects.

The beneficial effects are that:

according to the battery heat dissipation structure, the first part is arranged in the bare cell group, so that heat accumulated in the bare cell group is conducted to the first part and is conducted to the third part through the second part, the heat in the bare cell group is led out to the surface of the bare cell group and finally is conducted out through the packaging body, heat dissipation in the bare cell group is completed, heat accumulation in the bare cell group is prevented, a battery containing the bare cell group is always in a proper working temperature range, the internal temperature and the external temperature of the bare cell group in the battery are uniform, battery capacity attenuation caused by overlarge temperature difference is prevented, and the service life and the service reliability of the battery are improved.

Drawings

FIG. 1 is an isometric view of a battery stealth package according to an embodiment of the present utility model;

FIG. 2 is an isometric view of a battery according to an embodiment of the present utility model with one of the bare cell units hidden when the battery is not packaged;

FIG. 3 is an isometric view of a heat sink provided in accordance with an embodiment of the present utility model;

FIG. 4 is a schematic illustration of a foil from which a heat sink is made according to an embodiment of the present utility model;

fig. 5 is an isometric view of a battery stealth package according to another embodiment of the present utility model.

In the figure:

10. a bare cell group; 11. bare cell monomers;

101. a battery upper cover; 102. sticking a tape;

200. a heat sink; 201. an insulating layer; 210. a first section; 220. a second section; 230. and a third portion.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the 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.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The first direction in this embodiment is the X direction shown in fig. 1, that is, the thickness direction of the bare cell assembly 10; the second direction is the Y direction shown in fig. 1, that is, the width direction of the bare cell assembly 10, and the height direction when the battery is standing; the third direction is the Z direction shown in fig. 1, that is, the length direction of the bare cell set 10; the first direction, the second direction and the third direction are perpendicular to each other.

Referring to fig. 1 and 2, in the present embodiment, the battery heat dissipation structure includes a package body and a heat sink 200, wherein the package body is used for packaging a bare cell group 10 of a battery; the heat sink 200 includes a first portion 210, a second portion 220, and a third portion 230 connected in sequence, wherein the first portion 210 is located inside the die assembly 10, and the third portion 230 is sandwiched between an outer side surface of the die assembly 10 along the first direction and an inner side surface of the package; the first direction is a thickness direction of the bare cell assembly 10; the second portion 220 is configured to connect the first portion 210 and the third portion 230, and is configured to conduct heat absorbed by the first portion 210 to the third portion 230, and heat absorbed by the third portion 230 is configured to conduct heat to the package.

In this embodiment, the first portion 210 is disposed inside the bare cell set 10, so that heat collected inside the bare cell set 10 is conducted to the first portion 210 and is conducted to the third portion 230 through the second portion 220, so that heat inside the bare cell set 10 is led out to the surface of the bare cell set 10 and is finally conducted out through the package body, heat dissipation inside the bare cell set 10 is completed, heat collection inside the bare cell set 10 is prevented, a battery including the bare cell set 10 is always in a suitable operating temperature range, internal and external temperatures of the bare cell set 10 inside the battery can be uniform, battery capacity attenuation caused by overlarge temperature difference is prevented, and service life and reliability of the battery are improved.

The bare cell set 10 in this embodiment is any one of a laminated cell and a wound cell, when it is a laminated cell, the first portion 210 may be inserted between two laminated cells or directly into a laminated cell, and a plurality of first portions 210 may be inserted into a laminated cell, and the positions of the second portions 220 are not limited, and the second portions 220 may be located on any side of the laminated cell in the length direction or the width direction; when it is a wound cell, the second portion 220 can be located only in the width direction of the wound cell, i.e., in the height direction after the wound cell is made into a battery, unlike the laminated cell.

Optionally, the bare cell group 10 includes two bare cell units 11, and each bare cell unit 11 is provided with the heat sink 200. Through setting up two bare cell monomers 11 and two fin 200, can further improve radiating efficiency, prevent that heat from gathering in bare cell group inside, further improve reliability and the security of battery when using.

Further, the heat sink 200 is integrally formed, and the second portion 220 is located on at least one side of the die battery pack 10 along a second direction or at least one side along a third direction, wherein the second direction is a width direction of the die battery pack 10, and the third direction is a length direction of the die battery pack 10. The integrally formed heat sink 200 is formed by bending a foil, and has a simple manufacturing process and can reduce manufacturing cost. Specifically, when the second portion 220 is located on one side of the bare cell assembly 10 along the second direction, that is, the second portion 220 is wrapped on the bottom of the bare cell assembly 10 (the wrapping state in fig. 2 or fig. 5) when the battery is standing, the second portion is U-shaped to be wrapped; when the second portion 220 is located on a side of the bare cell assembly 10 along the third direction, that is, the second portion 220 is wrapped on a side of the bare cell assembly 10 (in the wrapping state in fig. 1) when the battery is standing, the second portion is wrapped in a loop shape. Of course, the second portion 220 may be located on any side or sides of the bare cell assembly 10 along the second direction or the third direction, which is not particularly limited in this example, and only needs to make the heat of the first portion 210 be conducted to the third portion 230 through the second portion 220.

Preferably, as shown in fig. 1 and 2, the gap between the edge of the heat sink 200 and the edge of the bare cell group 10 is a,2mm < a < 10mm. Because the gap with the size A exists between the edge of the radiating fin 200 and the edge of the bare cell set 10, the radiating fin 200 can be prevented from contacting the pole piece with the exposed side edge of the bare cell set 10, and the safety and reliability of a battery using the battery radiating device are further improved.

Specifically, in order to improve the stability of installation and prevent the heat sink 200 from falling off, the heat sink 200 in this embodiment is adhered to the outer wall of the bare cell 11 by the adhesive tape 102, and the adhesive tape 102 may be double-sided adhesive tape, so that not only the heat sink 200 and the bare cell 11 can be fixed, but also the bare cell 11 can be packaged, and no further description is provided in this embodiment.

Further, referring to fig. 3 and 4, in the present embodiment, the heat sink 200 is made of a PET composite copper foil or a copper foil, and an insulating layer 201 is disposed at a contact portion between the heat sink 200 and the bare cell assembly 10. Specifically, the insulating layer 201 is a gap-coated ceramic layer or an attached insulating tape layer. The arrangement is to prevent the heat sink 200 from directly contacting the pole piece of the bare cell set 10, so that the bare cell set 10 is short-circuited, and the safety and reliability of the bare cell set 10 are improved.

Preferably, the thickness of the heat sink 200 is 10-200 μm, and thus the heat sink 200 provided not only has good heat conduction property, but also is light in weight, does not cause a significant increase in the weight of the battery, and ensures that the energy density of the battery is not affected.

Optionally, the package body includes an insulating film and a package case (not shown in the drawings), and the insulating film is covered inside the package case. Specifically, the insulating film is a Mylar film (Mylar film, a polyester film, also called Mylar paper or an insulating tape) made of PP or PE, and can perform an insulating function on the surfaces of the bare cell assembly 10 and the heat sink 200, so as to prevent a short circuit between the package housing and the bare cell assembly 10. Further, the packaging shell is a square aluminum shell, the bare cell 11 is a laminated cell, and the finally prepared battery is a square aluminum shell battery.

In another alternative embodiment, please refer to fig. 5, the difference between this embodiment and the above embodiment is that the die battery pack 10 includes at least two die units 11, the die units 11 are stacked, and the first portion 210 is disposed between each two adjacent die units 11. That is, the first portion 210 is shared between every two adjacent bare cell units 11, so that heat collected between the two adjacent bare cell units 11 is led out and sequentially conducted to the package body through the second portion 220 and the third portion 230, and the number of the first portions 210 can be reduced, so that the weight of the battery using the battery heat dissipation structure is reduced, and the energy density of the battery is improved. Specifically, two third portions 230 are provided, and the two third portions 230 are respectively interposed between the two outermost die units 11 and the package. The two third portions 230 can conduct heat inside the bare cell pack from both sides to the package body, heat dissipation efficiency is faster, and heat of the bare cell pack 10 can be made more uniform. Fig. 5 is a schematic diagram of a stacked arrangement of 2 bare cell units 11, and the first portion 210 and one of the third portions 230 are blocked, which is not described in detail in this embodiment.

Another object of the present utility model is to provide a battery comprising a bare cell assembly 10 and a battery heat dissipation structure as described in any of the above aspects. The battery has all the beneficial effects of the battery heat dissipation structure, and the details are not repeated here.

The manufacturing process of the battery is described in detail as follows:

firstly, performing gap coating on a ceramic layer or pasting an insulating tape on a radiating fin 200 made of copper foil, so as to form an insulating layer 201;

then bending the heat sink 200 and coating the surface of the bare cell unit 11, wherein the second part 220 in fig. 1 is positioned on one side of the bare cell unit 11 in the Z direction, or the second part 220 in fig. 2 is positioned on one side of the bare cell unit 11 in the Y direction, so as to form a waistcoat heat dissipation structure, and the two bare cell units 11 are butterfly welded on the battery upper cover 101 to form the structure in fig. 2, so that the positive electrode and the negative electrode of the bare cell unit 11 are respectively connected with the positive electrode and the negative electrode of the battery upper cover 101;

combining the two bare cell monomers 11 welded by the butterfly, enabling the two first parts 210 to be closely attached to the inside of the bare cell group 10, ensuring that a gap A of 2-10mm is formed between the edge of the radiating fin 200 and the edge of the bare cell group 10, and then coating an insulating film on the bare cell group 10;

and finally, placing the bare cell group 10 coated with the insulating film into a packaging shell, injecting liquid after laser welding, standing for 24 to 48 hours, and then forming components, thereby completing the manufacture of the cell.

The battery manufactured by the manufacturing method has the battery heat dissipation structure in the embodiment, and heat accumulated in the battery in the charging and discharging process can be conducted to the packaging shell through the heat dissipation fins 200, so that the overall temperature distribution of the battery tends to be consistent, local high-temperature aging is avoided, capacity fading is accelerated, and the use safety and the service life of the battery are improved.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The battery heat radiation structure is characterized by comprising

A package for packaging a bare cell group (10) of a battery;

the heat dissipation plate (200), the heat dissipation plate (200) comprises a first part (210), a second part (220) and a third part (230) which are sequentially connected, the first part (210) is positioned in the bare cell group (10), and the third part (230) is clamped between one outer side surface of the bare cell group (10) along a first direction and the inner side wall surface of the package body; the first direction is the thickness direction of the bare cell group (10);

the second portion (220) is configured to connect the first portion (210) and the third portion (230), and is capable of conducting heat absorbed by the first portion (210) to the third portion (230), and heat absorbed by the third portion (230) is capable of being conducted to the package.

2. The battery heat dissipation structure according to claim 1, characterized in that the heat sink (200) is made of a PET composite copper foil or copper foil, and an insulating layer (201) is provided at a contact position of the heat sink (200) and the bare cell group (10).

3. The battery heat dissipation structure according to claim 2, wherein the insulating layer (201) is a gap-coated ceramic layer or an attached insulating tape layer.

4. The battery heat dissipation structure according to claim 1, wherein the bare cell group (10) includes two bare cell units (11), each bare cell unit (11) being provided with the heat sink (200).

5. The battery heat dissipation structure according to claim 4, wherein the heat dissipation sheet (200) is integrally formed, the second portion (220) is located on at least one side surface of the bare cell group (10) along a second direction or at least one side surface along a third direction, the second direction is a width direction of the bare cell group (10), the third direction is a length direction of the bare cell group (10), and the first direction, the second direction and the third direction are perpendicular to each other.

6. The battery heat dissipation structure according to claim 1, wherein the bare cell group (10) includes at least two bare cell units (11), the bare cell units (11) are stacked, and the first portion (210) is disposed between every two adjacent bare cell units (11).

7. The battery heat dissipation structure according to claim 6, wherein two third portions (230) are provided, and the two third portions (230) are respectively sandwiched between the two outermost bare cell units (11) and the package.

8. The battery heat dissipation structure according to any one of claims 1-7, characterized in that the gap between the edge of the heat sink (200) and the edge of the bare cell group (10) is a,2mm ∈a ∈10mm.

9. The battery heat dissipating structure of any one of claims 1 to 7, wherein the package body comprises an insulating film and a package body, and the insulating film is provided inside the package body.

10. Battery, characterized by comprising a bare cell group (10) and a battery heat dissipation structure according to any of claims 1-9.