CN218569002U

CN218569002U - Battery pack

Info

Publication number: CN218569002U
Application number: CN202222919520.5U
Authority: CN
Inventors: 鲁顺; 彭应杰
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-11-01
Filing date: 2022-11-01
Publication date: 2023-03-03
Anticipated expiration: 2032-11-01

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery pack, which comprises a box body, wherein the box body is used for containing a battery module; a heating film is arranged between the box body and the battery module and connected with the battery module, and a heat conduction grease condensation layer is arranged between the heating film and the battery module. Through set up the heat conduction grease congeals layer between heating film and battery module, bond battery module and heating film together completely, can avoid because the risk that the resistance wire in the vibration messenger heating film appears bending, rupture, improve heating efficiency, reduce the inefficacy risk to increase the reliability of whole battery package.

Description

Battery pack

Technical Field

The utility model relates to a battery technology field especially relates to a battery pack.

Background

The lithium battery has poor low-temperature characteristics, and when the lithium battery is used at low temperature, a heating function needs to be provided for the lithium battery, so that the lithium battery can normally operate. The most widely used heating device is a heating film, the heating film and a battery module in most of lithium batteries are directly bonded and fixed at present, for example, patent document 202120199426.X discloses that a front heating film and a rear heating film are respectively attached to a front fixing sheet metal guard plate and a rear fixing sheet metal guard plate with back glue; as disclosed in the patent document with the patent number 202122729673.9, "the lower PI heating film insulating layer has 3M glue, and the gluing and fixing can be completed only by attaching the 3M glue on the inner side of the lower PI heating film insulating layer to related equipment," when the battery pack vibrates during use, the heating film is easily dislocated, so that the risk of bending and breaking the resistance wire is present, the overall heating performance of the battery pack is affected, and the reliability of the whole battery pack is reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery package can avoid increasing the reliability of whole battery package because the risk of bending, rupture appears in the resistance wire that the vibration made in the heating film.

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

a battery pack, comprising:

the box body is used for containing the battery module;

the heating film is arranged between the battery module and the box body, and is connected with the battery module;

and a heat conduction grease condensation layer is arranged between the heating film and the battery module.

Preferably, the heat conductive grease layer covers a contact surface between the heating film and the battery module.

Preferably, one end surface of the heat conductive grease layer is bonded to the battery module, and the other end surface of the heat conductive grease layer is bonded to the heating film

Preferably, the contact surface between the heating film and the heat conductive grease layer and the contact surface between the battery module and the heat conductive grease layer have the same shape and area.

Preferably, the heating film has a hollow structure.

Preferably, the hollow structures are rectangular and distributed along the length direction of the heating film.

Preferably, a heat conduction structural adhesive is arranged between the heating film and the box body.

Preferably, the box body is provided with a containing groove, and the battery module is arranged in the containing groove; the heat-conducting structure adhesive is adhered between the heating film and the bottom of the accommodating groove; the heat-conducting structural adhesive covers at least 1/3 of the area of the heating membrane.

Preferably, the heating film is provided with a bending part, the bending part is detachably connected with the box body, and the bending part is arranged at the edge of the heating film.

Preferably, the heat dissipation structure comprises a liquid cooling guide plate, and the liquid cooling guide plate is laid on the opposite side of the bottom of the box body where the heating film is located.

The utility model has the advantages that:

through being equipped with heat conduction between heating film and the battery module and congealing the fat layer, can bond battery module and heating film together completely, the fat layer is congealed in the heat conduction simultaneously has better elasticity, has avoided because battery module's vibration in the use, and the heating efficiency that the risk caused such as messenger's resistance wire in the heating film appears bending, rupture to low or the trouble that became invalid to increase the reliability of whole battery package.

Drawings

Fig. 1 is an exploded view of the battery pack of the present invention;

fig. 2 is an exploded view of the heating film in the battery pack of the present invention;

fig. 3 is a schematic view showing a heat dissipation structure in the battery pack of the present invention;

fig. 4 is a schematic diagram of the battery pack of the present invention showing the liquid passing hole and the bottom plate.

In the figure:

1-a battery module; 2-heat conducting gel coat; 3-heating the film; 31-hollow structure; 32-a bending part; 33-a PET film; 34-a heat-generating aluminum sheet; 4-heat-conducting structural adhesive; 5-a box body; 51-a receiving groove; 52-a base plate; 6-a heat dissipation structure; 61-liquid cooled fluidic plates; 62-liquid cooling diversion column; 63-liquid passing hole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures associated with the present invention are shown in the drawings, not all of them.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1, the battery includes a case 5 for housing the battery module 1; a heating film 3 is arranged between the box body 5 and the battery module 1, the heating film 3 is connected with the battery module 1, and a heat conduction grease condensation layer 2 is arranged between the heating film 3 and the battery module 1.

Through increasing heat conduction between heating film 3 and battery module 1 and congealing fat layer 2, bond battery module 1 and heating film 3 together completely, heat conduction congeals the fat layer simultaneously and has better elasticity, can avoid because the vibration of battery module 1 makes the resistance wire in the heating film 3 appear bending, risks such as rupture, cause the trouble that heating efficiency is low or became invalid, and simultaneously, glue 4 the bonding through heat conduction structure at heating film 3 and box 5, avoid appearing the phenomenon of dry combustion method, thereby increase the reliability of whole battery package.

In the following, the present embodiment is described in detail, and the battery pack includes a case 5, the case 5 being used for containing the battery module 1; in this embodiment, the box 5 is provided with the storage tank 51, the battery module 1 is arranged in the storage tank 51, the battery module 1 is formed by connecting a plurality of battery cells in series or in parallel in this embodiment, the heating film 3 is arranged between the box 5 and the battery module 1, as shown in fig. 2, the heating film 3 can be formed by two PET films 33 and heating aluminum sheets 34, the heating aluminum sheets 34 are clamped between the two PET films 33, wherein the heating aluminum sheets 34 are 18 μm thick, the PET films 33 are 50 μm thick, the PET films 33 with 50 μm thick are arranged on the upper and lower sides of the heating aluminum sheets 34 to encapsulate the heating aluminum sheets, insulation is formed, and the integrity of heating is ensured. In addition, this heating film 3 is connected with battery module 1, in this embodiment, heating film 3 is connected for the electricity with battery module 1, specifically, heating film 3 has kink 32 in order to fix heating film 3, avoid it to rock and lead to heating film inside (like the aluminum sheet that generates heat) to damage, influence the heating effect, kink 32 can be dismantled with box 5 and be connected, be connected kink 32 and the inner wall of box 5 through screw or bolt in this embodiment, be used for reducing rocking or the vibration of heating film 3 in the work, avoid heating film 3 because of rocking or the vibration appearance is unusual, and then influence the heating effect. The bent portion 32 is provided at the edge of the heating film 3 to increase the contact area between the heating film 3 and the battery module 1, and for the convenience of processing the bent portion 32, the bent portion 32 and the heating film 3 are integrally formed, and further, the bent portion 32 is formed by bending by pressing. It congeals fat layer 2 to be equipped with the heat conduction between heating film 3 and the battery module 1, in this embodiment, the heat conduction congeals a terminal surface on fat layer 2 and the bottom surface of battery module 1 and bonds, another terminal surface and the heating film 3 bonding on fat layer 2 are congealed in the heat conduction, it is formed by the tiling of the heat conduction congeals fat layer 2 to congeal the fat layer by the heat conduction, it will be in the same place to paste between heating film 3 and the battery module 1 through congealing fat layer 2 in the heat conduction, thereby it has better elasticity to avoid because battery module 1's vibration and causes the resistance wire bending risk to appear in the heating film 3 because the heat conduction congeals the fat. Further, heat conduction congeals fat layer 2 and covers the surface between heating film 3 and the battery module 1, and the area of contact between fat layer 2 and the battery module 1 is congealed in the increase heat conduction, and it is inseparabler to make the pasting to further reduce the vibration, the shape and the area of the contact surface of heating film 3 and heat conduction congeals fat layer 2 and the contact surface of battery module 1 and heat conduction congeals fat layer 2 are the same in this embodiment, can make whole battery module 1 thermally equivalent.

The heating film 3 is clamped between the heat conducting gel layer 2 and the bottom of the box body 5, the heat conducting structure adhesive 4 is adhered between the heating film 3 and the bottom of the accommodating groove 51 in the embodiment, the HT8655 type heat conducting structure adhesive is adopted in the embodiment, and other types of heat conducting structure adhesives can be adopted in other embodiments. The heat-conducting structure glue 4 at least covers 1/3 of the area of the heating film 3, so that the two are tightly adhered to avoid shaking, and the heat-conducting structure glue can also cover the whole contact surface of the heating film 3 and the box body 5 in other embodiments. Further, hollow structures 31 are arranged on the heating film 3, and the hollow structures 31 are uniformly distributed on the heating film 3. Air bubbles generated when the heating film 3 is adhered to the bottom of the box body 5 are discharged in time through the hollow structure 31, so that the heating film 3 is prevented from being burnt dry; concretely, hollow out construction 31 evenly distributed is in heating film 3, hollow out construction 31 is the rectangle space in this embodiment, the rectangle space distributes along heating film 3's length direction and sets up, it is required to explain, the design is adjusted according to battery module 1's demand to the size in rectangle space and the interval between the adjacent rectangle hole, in order to guarantee heating power, discharge in the air that makes in the bubble from hollow out construction 31 nearby, in other embodiments, also can adopt the hollow out construction of other shapes, specific shape and size do not restrict, as circular, triangle-shaped also or irregular shape all can, as long as the bubble that produces when will pasting catches up can. The hollow structure 31 is also filled with the heat conducting structure glue 4. The heat conduction structure glue 4 is added, so that when the heating film 3 is bonded with the box body 5, bubbles generated due to the existence of air are filled on the surface of the bonded heating film 3 and the box body 5, the dry burning phenomenon is avoided, and the integral reliability of the heating film 3 is improved.

The manufacturing process of the battery pack in the embodiment comprises the following steps: heat-conducting structural adhesive 4 is smeared at the bottom in a containing groove 51 in a box body 5, a heating film 3 is covered on the heat-conducting structural adhesive 4, then the heating film 3 is pressed by using a scraping edge, and bubbles between the heating film 3 and the heat-conducting structural adhesive 4 and between the heat-conducting structural adhesive 4 and the box body 5 are discharged through a nearby hollow structure 31 on the heating film 3, so that no bubbles exist between the heating film 3 and the box body 5 to prevent a dry burning phenomenon; fixing the heating film 3 on the side wall of the box body 5 through screws, coating heat conduction grease on the upper surface of the heating film 3 to form a heat conduction grease condensation layer 2, and pasting the battery module 1 with the heating film 3 through the heat conduction grease condensation layer 2.

The embodiment also provides a battery pack which comprises a heat dissipation structure 6, wherein the heat dissipation structure 6 comprises a liquid cooling guide plate 61, the liquid cooling guide plate 61 is provided with a liquid cooling guide column 61, it can be understood that the liquid cooling guide plate is provided with a liquid flow channel communicated with the liquid cooling guide column 61, the liquid cooling guide plate 61 is laid on the opposite side of the bottom of the heating film 3 and the box body 5 of the battery module 1 and is communicated with an external cooling liquid device through a liquid passing hole 63 arranged on the side edge part of the box body 5 to form a cooling liquid channel for dissipating heat of the battery module 1 so as to avoid overhigh temperature; the bottom plate 52 is disposed on the bottom of the box 5 to fix the liquid cooling baffle 61 and the box 5, and the liquid cooling baffle may be fixed by bonding or welding, where the connection mode is not particularly limited. On one hand, the battery pack can prevent the resistance wire in the heating film 3 from being broken when the battery vibrates, and on the other hand, the battery pack can also prevent the dry burning phenomenon from being generated.

It is to be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements, and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery pack, comprising:

the box body (5) is used for containing the battery module (1);

the heating film (3) is arranged between the battery module (1) and the box body (5), and the heating film (3) is connected with the battery module (1);

a heat-conducting grease-condensing layer (2) is arranged between the heating film (3) and the battery module (1).

2. The battery pack according to claim 1, wherein the thermally conductive grease layer (2) covers the contact surface between the heating film (3) and the battery module (1).

3. The battery pack according to claim 1, wherein one end face of the thermally conductive grease layer (2) is bonded to the battery module (1), and the other end face of the thermally conductive grease layer (2) is bonded to the heating film (3).

4. The battery pack according to claim 2, wherein the contact surface of the heating film (3) with the thermally conductive grease layer (2) and the contact surface of the battery module (1) with the thermally conductive grease layer (2) have the same shape and area.

5. The battery pack according to claim 1, wherein the heating film (3) has a hollowed-out structure (31) thereon.

6. The battery pack according to claim 5, wherein the hollowed-out structures (31) are rectangular and distributed along the length direction of the heating film (3).

7. The battery pack according to any of claims 1 to 6, wherein a heat conducting structural adhesive (4) is provided between the heating film (3) and the case (5).

8. The battery pack according to claim 7, wherein the case (5) is provided with a container (51), and the battery module (1) is disposed in the container (51); the heat-conducting structural adhesive (4) is adhered between the heating film (3) and the bottom of the accommodating groove (51); the heat-conducting structural adhesive (4) at least covers 1/3 of the area of the heating film (3).

9. The battery pack according to claim 1, wherein the heating film (3) has a bent portion (32), the bent portion (32) is detachably connected to the case (5), and the bent portion (32) is provided at an edge of the heating film (3).

10. The battery pack according to claim 1, further comprising a heat dissipating structure (6), wherein the heat dissipating structure (6) comprises a liquid cooling baffle (61), and the liquid cooling baffle (61) is disposed on the opposite side of the bottom of the case (5) where the heating film (3) is located.