Power battery pack with heating film

Abstract

The utility model discloses a power battery pack with a heating film, which comprises a box body, a battery cell assembly and a heating element, the battery cell assembly comprises a plurality of battery cell modules, the plurality of battery cell modules are assembled in the box body side by side, and the heating element is arranged between two battery cell modules arranged side by side. The strip-shaped foam is adopted at the top of the large surface of the heating film, and the structural adhesive or the heat-conducting structural adhesive is adopted at the position, corresponding to the heating wire, of the large surface of the heating film, so that the heating film is extruded and fixed by the two battery cell modules, the condition that the heating film is separated from the battery cell modules is not easy to occur, and the heating film can be prevented from dry burning; meanwhile, the glue can be prevented from overflowing and flowing to the surfaces of the battery cell modules, and busbar welding is prevented from being affected.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery pack low temperature heating technical field especially relates to a kind of power battery pack with heating film. BACKGROUND

[0002] Current power battery pack is more and more high to low temperature heating performance requirement, and many use heating film to heat battery cell.

[0003] The existing power battery pack, heating film is bonded to the bottom of battery cell shell, one is that heating film is bonded to battery cell shell by double-sided adhesive tape, but using double-sided adhesive tape, there is not tight with battery cell shell after long time aging, leading to the phenomenon that heating film dry burning;Another is that heating film is bonded to battery cell shell by glue, to avoid overflow, usually glue covers only 60%-80% of heating film area, and heating film also exists dry burning phenomenon.

[0004] The bonding mode of the above-mentioned heating film can cause damage to the heating film and affect the heating effect of the battery cell. Based on the above reasons, a power battery pack with heating film is needed in reality, which can fix the heating film between the battery cell modules and prevent dry burning caused by delamination.

[0005] The patent document with application No. 202120417951.4 discloses a heating film and a battery pack. The heating film provided by the application includes a liquid capsule, a heating liquid and a heating element located in the liquid capsule.

[0006] The heating film provided by the application heats the heating liquid by the heating element, thereby heating the battery module. Since the heating element first heats the heating liquid, the heating of the battery module by the heating film is more uniform, thereby reducing local dry burning and reducing the risk of thermal runaway of the battery pack. However, the scheme also has the following problems: the heating film is located in the shell and is bonded by glue, which can cause the heating film to come off and affect the heating effect. UTILITY MODEL CONTENTS

[0007] To solve the above problems, the utility model aims to provide a power battery pack with a heating film. The heating film is located between the battery cell modules and is not easy to fall off, and the bonding glue does not overflow to affect the welding of the battery cell modules.

[0008] The purpose of the utility model can be achieved by the following technical solutions: a power battery pack with a heating film, a battery cell assembly and a heating element.

[0009] The battery cell assembly includes a plurality of battery cell modules, and the plurality of battery cell modules are assembled side by side in the box. The heating element is arranged between two side-by-side battery cell modules.

[0010] Further, the heating element includes a heating film and a strip-shaped foam, the heating film is pasted with strip-shaped foam on both sides, and the strip-shaped foam is pasted on the battery cell module.

[0011] Further, the compression amount of the strip-shaped foam after being assembled and pasted is not less than 50%, the material of the strip-shaped foam is melamine foam, and the melamine foam adopts open foaming holes.

[0012] Further, the heating film is pasted with the two side cell modules at the heating wire positions on the two sides.

[0013] Further, the heating film is pasted with the cell module through structural glue or heat-conducting structural glue.

[0014] Further, the cell module is assembled and pasted at the bottom of the box.

[0015] The utility model discloses the beneficial effects of the following:

[0016] 1, the utility model discloses heating film large surface top adopts strip-shaped foam, and the heating film large surface corresponds heating wire position and adopts structural glue or heat-conducting structural glue. Adopt such bonding structure, can prevent the glue overflow and flow to the cell module surface, avoid affecting the busbar welding.

[0017] 2, the utility model discloses heating film is arranged between two cell modules, and simultaneously pastes the heating film through strip-shaped foam and glue, makes heating film and is pressed fixed by two cell modules, and heating film and cell module separation situation can not appear, can prevent heating film dry burning.

[0018] 3, the utility model discloses strip-shaped foam compression amount after being assembled and pasted is not less than 50%, and the material of strip-shaped foam is melamine foam, and the melamine foam adopts open foaming hole, makes strip-shaped foam have high compression low resilience characteristics, and long -time bonding with cell module will not fall off, can make heating film firm fixed between two cell modules. DRAWINGS

[0019] Figure 1 It is the structure schematic drawing of the power battery pack with heating film of the utility model;

[0020] Figure 2 It is the explosion schematic drawing of cell module and heating element of the utility model;

[0021] Figure 3 It is the explosion schematic drawing of heating element of the utility model;

[0022] Figure 4 It is the large surface schematic drawing of heating film of the utility model.

[0023] 100, box;

[0024] 200, cell assembly; 210, cell module;

[0025] 300, heating element; 310, heating film; 320, strip foam; 330, heating wire position. DETAILED DESCRIPTION

[0026] Embodiments of the application are described below in detail, examples of which are represented in the attached drawings, in which the same or similar symbols throughout the drawings denote the same or similar elements or elements having the same or similar functions. The embodiments described below by reference to the drawings are exemplary only, are for the purpose of explanation only and are not to be construed as limiting the application.

[0027] As shown in Figures 1-4 The utility model discloses a kind of power battery packs with heating film, including box 100, cell assembly 200 and heating element 300.

[0028] Cell assembly 200 includes multiple cell modules 210, for example: as shown in Figure 1 Cell assembly 200 includes 3 cell modules 210, 3 cell modules 210 are assembled side by side in box 100, as shown in Figure 2 Heating element 300 is arranged between every two side-by-side cell modules 210.

[0029] The structure of heating element 300 is as shown in Figure 3 And Figure 4 Heating element 300 includes heating film 310 and strip foam 320, strip foam 320 is pasted on the top of both sides of heating film 310, strip foam 320 does not cover heating wire inside heating film 310, and the other side of strip foam 320 is pasted cell module 210.

[0030] Among them, the compression amount of strip foam 320 after pasting and assembling is not less than 50%, the material of strip foam 320 is melamine foam, and melamine foam adopts open type foaming hole.

[0031] Strip foam 320 has high compression and low resilience characteristics, and does not fall off after long-term bonding with cell module 210, so that heating film 310 can be firmly fixed between two cell modules 210 and is not easy to fall off.

[0032] Heating wire position 330 is assembled on both sides of heating film 310 and is bonded with two cell modules 210, and bonding material can adopt structural adhesive or heat-conducting structural adhesive, so that heating film 310 and cell module 210 can be firmly bonded and better heat-conducted at the same time.

[0033] The strip-shaped foam 320 is used to bond the heating film 310 on the top of the large surface, and the structural glue or the heat-conducting structural glue is used to bond the heating film 310 on the position corresponding to the heating wire 330 on the large surface of the heating film 310 and the battery cell module 210. By using the bonding structure, the overflow of the glue to the surface of the battery cell module 210 can be prevented, and the welding of the bus bar can be affected.

[0034] Meanwhile, by bonding the heating film 310 between the two parallel battery cell modules 210, the heating film 310 can be fixed by being pressed by the two battery cell modules 210, and the separation of the heating film 310 from the battery cell module 210 can be avoided, and the dry burning of the heating film 310 can be prevented.

[0035] Further, when the battery cell module 210 is assembled in the box body 100, the battery cell module 210 can be assembled in the box body 100 through the bottom of the battery cell module 210, and the firm installation of the battery cell module 210 in the box body 100 can be ensured.

[0036] Principle of the utility model:

[0037] The strip-shaped foam is used to bond the heating film 310 on the top of the large surface, and the structural glue or the heat-conducting structural glue is used to bond the heating film 310 on the position corresponding to the heating wire 330 on the large surface of the heating film 310 and the battery cell module 210. By using the bonding structure, the heating film 310 can be fixed by being pressed by the two battery cell modules 210, and the separation of the heating film 310 from the battery cell module 210 can be avoided, and the dry burning of the heating film 310 can be prevented, and the overflow of the glue to the surface of the battery cell module 210 can be prevented, and the welding of the bus bar can be affected.

[0038] The above merely provides the preferred embodiment of the utility model, but the protection scope of the utility model is not limited to this, and any skilled person in the art can make equivalent substitution or change according to the technical scheme and the conception of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

[0039] In the utility model, unless another definite provision and limitation, the first feature is on the second feature "up" or "down", which can be direct contact of the first and second features or indirect contact of the first and second features through the intermediate medium. Moreover, the first feature is "on", "above" and "upper surface" of the second feature, which can be directly above or obliquely above of the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature is "under", "below" and "lower surface" of the second feature, which can be directly below or obliquely below of the first feature, or only indicates that the horizontal height of the first feature is lower than that of the second feature.

Claims

1. A power battery pack with heating film, characterized in that, The battery cell assembly (200) comprises a plurality of battery cell modules (210), the plurality of battery cell modules (210) are assembled side by side in the box body (100), and the heating element (300) is arranged between two side-by-side battery cell modules (210). The heating element (300) comprises a heating film (310) and a strip-shaped foam (320), the strip-shaped foam (320) is pasted on the top of the two large sides of the heating film (310), and the strip-shaped foam (320) is pasted on the battery cell module (210). The heating film (310) is provided with a heating wire portion (330) on the two large sides and is bonded to the two battery cell modules (210); and the heating film (310) is bonded to the battery cell module (210) through structural glue or heat-conducting structural glue. The compression amount of the strip-shaped foam (320) after assembly is not less than 50%, the strip-shaped foam (320) is made of melamine foam, and the melamine foam adopts an open foaming hole.

2. The power battery pack with heating film according to claim 1, characterized in that, The bottom of the battery cell module (210) is bonded and assembled in the box body (100).

3. The power battery pack with heating film according to claim 1, characterized in that, ​

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