CN218975563U

CN218975563U - Battery pack

Info

Publication number: CN218975563U
Application number: CN202223117147.8U
Authority: CN
Inventors: 肖鹏
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-11-23
Filing date: 2022-11-23
Publication date: 2023-05-05
Anticipated expiration: 2032-11-23

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery pack which comprises a battery box, a cooling plate and a battery cell, wherein the cooling plate and the battery cell are arranged in the battery box, a blue film and a first heat conduction layer are sequentially arranged on the side wall of the battery cell from inside to outside, a second heat conduction layer is arranged at the bottom of the battery cell, the second heat conduction layer is attached to the cooling plate, the first heat conduction layer is connected with the second heat conduction layer, and the first heat conduction layer extends upwards to the top of the side wall of the battery cell, so that the problem that the temperature difference of the battery cell with larger height dimension in the height direction is overlarge is solved, the blue film can have good insulation effect and waterproof effect on the battery cell, the safety of the battery pack is effectively improved, and the service life of the battery pack is prolonged.

Description

Battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack.

Background

The battery cells are the minimum units of the battery pack and are also electric energy storage units, a plurality of battery cells are packaged together by using the same group of components such as battery module clamping plates, module end plates, binding bands and the like, when the battery cells are connected with the outside through a unified boundary, a module is formed, and after a plurality of modules are controlled or managed together by a battery management system and a thermal management system, a battery pack is formed.

In order to improve the energy density of the battery pack in the current industry, the size of the battery cell is often designed to be larger, especially the height of the battery cell, and the liquid cooling plate of the battery pack is usually arranged at the bottom of the battery cell, so that the distance between the top of the battery cell with larger height and the liquid cooling plate is larger, the temperature at the top of the battery cell is higher, the problem that the temperature difference of the battery cell in the height direction is overlarge is further solved, the potential safety hazard of the battery pack is caused, and the service life of the battery pack is shortened.

Therefore, there is a need to provide a battery pack to solve the above-mentioned problems.

Disclosure of Invention

The utility model aims to provide a battery pack which solves the problem that the temperature difference of a battery cell with a larger height dimension is too large in the height direction, and the side wall of the battery cell also has good insulativity and waterproof property.

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

a battery pack, comprising:

a battery box;

the cooling plate is arranged at the bottom of the battery box;

the battery cell is installed in the battery box, is equipped with blue membrane and first heat conduction layer from inside to outside in proper order on the lateral wall of battery cell, and the bottom of battery cell is equipped with the second heat conduction layer, and the second heat conduction layer is laminated mutually with the cooling plate, and first heat conduction layer is connected with the second heat conduction layer, and the top that first heat conduction layer upwards extends to the lateral wall.

Optionally, the blue film and the first heat conducting layer are bonded through an adhesive layer.

Optionally, the thickness of the adhesive layer is 20 microns or less.

Optionally, the battery cell is a square battery cell.

Optionally, the side walls include two opposite first side walls and two opposite second side walls, the longitudinal cross-sectional area of the first side walls being greater than the longitudinal cross-sectional area of the second side walls, and the first heat conductive layer is located on the first side walls.

Optionally, the longitudinal cross-sectional area of the first thermally conductive layer is equal to the longitudinal cross-sectional area of the first sidewall.

Optionally, the first heat conducting layers are disposed on the two first side walls.

Optionally, the cross-sectional area of the second thermally conductive layer is equal to the cross-sectional area of the bottom of the cell.

Optionally, the first heat conducting layer and the second heat conducting layer are both graphene layers.

Optionally, the first heat conducting layer and the second heat conducting layer are of an integrated structure.

The beneficial effects are that:

according to the battery pack, the blue film and the first heat conduction layer are sequentially arranged on the side wall of the battery cell from inside to outside, the second heat conduction layer is arranged at the bottom of the battery cell and is attached to the cooling plate, the second heat conduction layer is connected with the first heat conduction layer, and the first heat conduction layer extends upwards to the top of the side wall of the battery cell, so that the effect of transmitting heat at the top of the battery cell to the cooling plate through the first heat conduction layer and the second heat conduction layer in sequence is achieved, the top of the battery cell can obtain a good heat radiation effect, the problem that the temperature difference of the battery cell with a large height dimension in the height direction is too large is solved, the safety of the battery pack is improved, and the service life of the battery pack is effectively prolonged. On the other hand, the blue film arranged between the first heat conduction layer and the side wall of the battery cell can have good insulation effect and waterproof effect on the side wall of the battery cell, and the safety of the battery pack is further improved.

Drawings

Fig. 1 is an exploded schematic view of a battery cell, a blue film, a first heat conducting layer and a second heat conducting layer according to the present utility model.

In the figure:

100. a battery cell; 110. a first sidewall; 120. a second sidewall; 200. a blue film; 310. a first heat conductive layer; 320. and a second heat conducting layer.

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 can be understood as appropriate 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 embodiment provides a battery pack, which solves the problem that the temperature difference of a battery cell with a larger height dimension is overlarge in the height direction, and the side wall of the battery cell also has better insulativity and waterproofness.

Specifically, as shown in fig. 1, the battery pack includes a battery box, a cooling plate and a battery cell 100 (both not shown in the battery box and the cooling plate are shown), the cooling plate and the battery cell 100 are all installed in the battery box, a blue film 200 and a first heat conducting layer 310 are sequentially arranged on the side wall of the battery cell 100 from inside to outside, a second heat conducting layer 320 is arranged at the bottom of the battery cell 100, the second heat conducting layer 320 is attached to the cooling plate, the first heat conducting layer 310 is connected with the second heat conducting layer 320, and the first heat conducting layer 310 extends upwards to the top of the side wall.

This battery package sets gradually blue membrane 200 and first heat conduction layer 310 from inside to outside on the lateral wall of electric core 100, set up second heat conduction layer 320 in the bottom of electric core 100, second heat conduction layer 320 is laminated mutually with the cooling plate, and second heat conduction layer 320 is connected with first heat conduction layer 310, first heat conduction layer 310 upwards extends to the top of electric core 100 lateral wall, the effect that passes through first heat conduction layer 310 and second heat conduction layer 320 in proper order with the heat at electric core 100 top is given the cooling plate has been realized from this, consequently, electric core 100 top can obtain better radiating effect, the great electric core 100 of high size is in the too big problem of difference in temperature in height direction, the security of battery package has been improved, the life of battery package has also been effectively prolonged. On the other hand, the blue film 200 disposed between the first heat conductive layer 310 and the side wall of the battery cell 100 can have a good insulation effect and waterproof effect on the side wall of the battery cell 100, and further improves the safety of the battery pack.

Preferably, the first heat conducting layer 310 and the second heat conducting layer 320 are both graphene layers, and the graphene material has good heat conducting performance, so that the heat transfer efficiency of the first heat conducting layer 310 and the second heat conducting layer 320 can be effectively improved, and therefore, the heat at the top of the battery cell 100 can be quickly transferred to the cooling plate, and the temperature uniformity of the battery cell 100 in the height direction is further improved. On the other hand, due to the good heat conducting property of the graphene material, compared with other heat conducting materials (such as metal materials, etc.), on the premise of the same heat conducting amount, the graphene layers are selected as the first heat conducting layer 310 and the second heat conducting layer 320, so that the thicknesses of the first heat conducting layer 310 and the second heat conducting layer 320 can be thinner, and the energy density of the battery pack can be improved.

Preferably, as shown in fig. 1, the first heat conducting layer 310 and the second heat conducting layer 320 are integrated, so as to simplify the overall production process of the first heat conducting layer 310 and the second heat conducting layer 320 and improve the production efficiency.

Optionally, the blue film 200 is adhered to the first heat conductive layer 310 through an adhesive layer, so as to fix the blue film 200 to the first heat conductive layer 310.

Preferably, the thickness of the adhesive layer is 20 micrometers or less, and illustratively, the thickness of the adhesive layer may be 10 micrometers, 15 micrometers, 20 micrometers, or the like, to reduce thermal resistance between the blue film 200 and the first heat conductive layer 310 and improve heat dissipation of the battery cell 100 (particularly, the top portion).

Optionally, the blue film 200 is adhered to the side wall of the cell 100, so as to fix the blue film 200 on the side wall of the cell 100.

Optionally, as shown in fig. 1, the battery cell 100 in the embodiment is a square battery cell, and the square battery cell has high unit capacity and good stability, and has the effect of improving the energy density of the battery pack and the use stability. Of course, in other embodiments, the cell 100 may also be a cylindrical cell 100.

Further, as shown in fig. 1, the side walls of the battery cell 100 include two opposite first side walls 110 and two opposite second side walls 120, the longitudinal cross-sectional area of the first side walls 110 is larger than that of the second side walls 120, the first heat conducting layer 310 is located on the first side walls 110, and the first heat conducting layer 310 is adhered to the first side walls 110 with larger area, which has the effect of being convenient for adhering the first heat conducting layer 310.

Preferably, as shown in fig. 1, the longitudinal cross-sectional area of the first heat conducting layer 310 is equal to the longitudinal cross-sectional area of the first side wall 110, so as to enlarge the contact area between the first heat conducting layer 310 and the side wall of the battery cell 100 as much as possible, improve the heat conducting capability of the first heat conducting layer 310, further improve the heat dissipation capacity at the top of the battery cell 100, and achieve the effect of further improving the temperature uniformity in the height direction of the battery cell 100.

Preferably, as shown in fig. 1, the two first side walls 110 are provided with the first heat conductive layers 310, that is, the number of the first heat conductive layers 310 is two, the two first heat conductive layers 310 are respectively connected with two sides of the second heat conductive layer 320 to form a heat conductive structure with a substantially U-shaped longitudinal section, and the two first side walls 110 are provided with the first heat conductive layers 310 to further improve the heat dissipation capacity at the top of the battery cell 100.

Preferably, as shown in fig. 1, the cross-sectional area of the second heat-conducting layer 320 is equal to the cross-sectional area of the bottom of the battery cell 100, so as to enlarge the contact area between the second heat-conducting layer 320 and the bottom of the battery cell 100 as much as possible, thereby improving the heat-conducting capability of the second heat-conducting layer 320 and further improving the heat dissipation capacity of the battery cell 100.

Optionally, the cooling plate may be a water cooling plate or a liquid cooling plate, and in this embodiment, the cooling plate is a liquid cooling plate, so as to improve cooling efficiency of the cooling plate.

According to the battery pack provided by the embodiment, the blue film 200 is wrapped on the side wall of the battery cell 100, the first heat conduction layer 310 is wrapped outside the blue film 200, the second heat conduction layer 320 connected with the first heat conduction layer 310 is wrapped at the bottom of the battery cell 100, the second heat conduction layer 320 is attached to the cooling plate, the first heat conduction layer 310 extends upwards to the top of the side wall of the battery cell 100, therefore, heat at the top of the battery cell 100 can be sequentially transferred to the cooling plate through the first heat conduction layer 310 and the second heat conduction layer 320, and for the battery cell 100 with larger height dimension, the heat at the top of the battery cell 100 can be transferred to the cooling plate, so that the problem that the temperature difference of the battery cell 100 with larger height dimension in the height direction is too large is solved, the safety of the battery pack is improved, and the service life of the battery pack is effectively prolonged. On the other hand, the blue film 200 disposed between the first heat conductive layer 310 and the side wall of the battery cell 100 can have a good insulation effect and waterproof effect on the side wall of the battery cell 100, and further improves the safety of the battery pack.

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

1. A battery pack, comprising:

a battery box;

the cooling plate is arranged at the bottom of the battery box;

the battery cell (100), battery cell (100) are installed in the battery box, be equipped with blue membrane (200) and first heat conduction layer (310) from inside to outside in proper order on the lateral wall of battery cell (100), the bottom of battery cell (100) is equipped with second heat conduction layer (320), second heat conduction layer (320) with the cooling plate laminating mutually, first heat conduction layer (310) with second heat conduction layer (320) are connected, just first heat conduction layer (310) upwards extend to the top of lateral wall.

2. The battery pack of claim 1, wherein the blue film (200) is bonded to the first thermally conductive layer (310) by an adhesive layer.

3. The battery pack of claim 2, wherein the adhesive layer has a thickness of 20 microns or less.

4. A battery pack according to any one of claims 1-3, wherein the cells (100) are square cells.

5. The battery pack of claim 4, wherein the side walls include two opposing first side walls (110) and two opposing second side walls (120), the first side walls (110) having a longitudinal cross-sectional area greater than a longitudinal cross-sectional area of the second side walls (120), the first thermally conductive layer (310) being located on the first side walls (110).

6. The battery pack according to claim 5, wherein a longitudinal cross-sectional area of the first thermally conductive layer (310) is equal to a longitudinal cross-sectional area of the first sidewall (110).

7. The battery pack according to claim 5, wherein the first heat conductive layer (310) is provided on both of the first side walls (110).

8. A battery pack according to any of claims 1-3, wherein the cross-sectional area of the second thermally conductive layer (320) is equal to the cross-sectional area of the bottom of the cell (100).

9. A battery pack according to any of claims 1-3, wherein the first thermally conductive layer (310) and the second thermally conductive layer (320) are both graphene layers.

10. A battery pack according to any of claims 1-3, wherein the first thermally conductive layer (310) and the second thermally conductive layer (320) are of unitary construction.