Soft package battery cell grouping assembly with heat conduction and insulation functions

Abstract

The utility model relates to a soft package battery cell grouping assembly with heat conduction and insulation functions, which comprises single battery cells, a composite heat conduction and insulation film and a plastic frame, the single battery cells are respectively arranged on two sides of the plastic frame, and the composite heat conduction and insulation film is arranged on the plastic frame. The surfaces of the two sides of the plastic frame are each provided with an open groove capable of containing the corresponding single battery cell, and the composite heat conduction and insulation film is arranged between the single battery cells and fixed to the surface of the plastic frame. According to the invention, the soft package battery cells can be conveniently grouped, the heat of the soft package battery cells can be quickly conducted out, and the safety of a battery system is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of battery systems, in particular to a soft-pack battery core group component with heat-conducting and heat-insulating functions. Background Art

[0002] In recent years, in response to the frequent safety accidents in industries such as electric vehicles and energy storage power stations, the industry has discovered that thermal runaway and thermal diffusion of lithium batteries are the main factors causing safety problems.

[0003] In terms of battery cell grouping, the existing technology relies on the conduction of the battery cells themselves. The main reason for thermal runaway is that the heat cannot be discharged in time and the uneven heat distribution caused by layout factors. The main measures that can be taken are mainly heat equalization and heat conduction.

[0004] In terms of heat diffusion prevention and control, thermal runaway of a single cell will generate a large amount of heat and flames, which can affect surrounding cells in a short time to form heat diffusion. Due to the high group density of the battery industry, the thermal runaway of a single cell has the characteristics of short time and high power, which is difficult to guide in a targeted manner. The main prevention and control measures are mainly isolation.

[0005] Existing battery group technologies mostly use liquid cooling solutions, which have many additional components, and occupy a large weight and volume. In addition, since they generally use one-sided heat dissipation on the side or bottom, although the cooling effect is obvious, it will further aggravate the uneven heat distribution of the battery cells. Utility Model Content

[0006] The utility model aims to provide a soft-pack battery cell grouping component with heat-conducting and heat-insulating functions, which can facilitate the grouping of soft-pack battery cells, quickly conduct the heat of the soft-pack battery cells, and ensure the safety of the battery system.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a soft-pack battery cell group component with conductive and thermal insulation functions, the soft-pack battery cell group component comprising a single battery cell, a composite conductive and thermal insulation film and a plastic frame, the single battery cells are respectively arranged on both sides of the plastic frame, and grooves capable of placing the single battery cells are provided on the surfaces of both sides of the plastic frame, the composite conductive and thermal insulation film is arranged between the single battery cells and fixed on the surface of the plastic frame.

[0008] Furthermore, a water cooling plate or a shell is fixed to the bottom of the composite heat-conductive insulation film.

[0009] Furthermore, the composite conductive insulation film includes an insulation film, and a first artificial graphite film, a first stainless steel foil, a first double-sided tape and a first release film are sequentially arranged on the left side of the insulation film, and a second artificial graphite film, a second stainless steel foil, a second double-sided tape and a second release film are sequentially arranged on the right side of the insulation film.

[0010] Furthermore, a temperature sampling sensor is fixed on the top of the plastic frame.

[0011] Furthermore, the thickness of the first artificial graphite film and the second artificial graphite film is 0.09-0.11 mm, and the thickness of the first stainless steel foil and the second stainless steel foil is 0.06-0.08 mm.

[0012] The beneficial effects of the utility model are as follows: the utility model provides a soft-pack battery cell grouping component with heat-conducting and heat-insulating functions, which can quickly conduct the heat of the soft-pack battery cell and ensure the consistency of the internal temperature of the battery cell, while preventing the thermal diffusion caused by thermal runaway of a single soft-pack battery cell; in terms of grouping energy density, the system grouping efficiency can reach more than 80%, which is at least 15% higher than the existing grouping scheme with thermal management, and the modular splicing of the grouping components greatly simplifies the assembly process and facilitates automation; in terms of battery pack heat distribution: the heat of a single soft-pack battery cell is evenly distributed, and the temperature difference between the soft-pack batteries is less than 5°C; in terms of thermal insulation of the battery pack: it can effectively prevent the thermal diffusion caused by thermal runaway of a single soft-pack battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the structure of a utility model composite heat-conducting and insulating film.

[0015] Wherein: 1. Single cell, 2. Plastic frame, 3. Composite conductive thermal insulation film, 31. First artificial graphite film, 32. First stainless steel foil, 33. First double-sided tape, 34. First release film, 35. Thermal insulation film, 36. Second artificial graphite film, 37. Second stainless steel foil, 4. Grooving, 5. Water cooling plate or shell, 6. Temperature sampling sensor. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings.

[0017] See also Figure 1 to Figure 2The utility model provides an embodiment: a soft-pack battery cell group component with conductive and thermal insulation functions, the soft-pack battery cell group component comprises a single battery cell 1, a composite conductive and thermal insulation film 3 and a plastic frame 2, the single battery cell 1 is respectively arranged on both sides of the plastic frame 2, and grooves 4 capable of placing the single battery cell 1 are opened on the two side surfaces of the plastic frame 2, and the composite conductive and thermal insulation film 3 is arranged between the single battery cells 1 and fixed on the surface of the plastic frame 2. The plastic frame 2 is injection molded and has a symmetrical structure. Two single battery cells 1 are installed at the same time. The composite thermal conductive insulation film 3 is pre-assembled in the plastic frame 2. The two single battery cells 1 in the grouped component use their maximum surface to clamp the composite thermal conductive insulation film 3 to form a finished grouped component. The composite thermal conductive insulation film 3 also has the heat dissipation and heat equalization functions required for normal use of the battery pack, temperature sampling and thermal barrier functions when the battery cell is thermally runaway. The plastic frame 2 can also be spliced ​​into a battery pack shell, and has both battery grouping function and battery cell protection function. The grouped component of the utility model can be adhered to the heat sink by using thermal conductive adhesive.

[0018] Please continue reading Figure 1 As shown, in one embodiment of the utility model, a water cooling plate or shell 5 is fixed to the bottom of the composite heat-conducting and insulating film 3. The artificial graphite film is a heat-conducting part that can conduct heat from the battery core, and is attached to the water cooling plate or shell 5, and can further absorb or release the conducted heat through external heat exchange.

[0019] Please continue reading Figure 2 As shown, in one embodiment of the utility model, the composite conductive insulation film 3 includes an insulation film 35, and the left side of the insulation film 35 is sequentially provided with a first artificial graphite film 31, a first stainless steel foil 32, a first double-sided tape 33 and a first release film 34, and the right side of the insulation film 35 is sequentially provided with a second artificial graphite film 36, a second stainless steel foil 37, a second double-sided tape and a second release film. The first artificial graphite film 31, the first stainless steel foil 32, the first double-sided tape 33 and the first release film 34 are symmetrically arranged with the second artificial graphite film 36, the second stainless steel foil 37, the second double-sided tape (not shown) and the second release film (not shown). The material of the thermal insulation film 35 is aerogel, and the function of the aerogel is thermal insulation. The edge of the double-sided tape exceeds the main body by about 3 to 5 mm and is attached to the release film. The release film is removed during use to facilitate sticking to the frame or the surface of the battery cell. There is no strict requirement for the thickness of the release film. The thermal insulation film 35 is generally 0.5 to 3 mm thick according to the difference in energy released and temperature when the battery cell is out of control. The artificial graphite film is the heat-conducting part of the composite thermal insulation film 3, and its function is to conduct heat away from the battery cell. The stainless steel foil is the skeleton part of the composite thermal insulation film 3. Since the strength of the artificial graphite film and the thermal insulation film 35 is relatively poor, in order to meet the strength requirements of engineering applications, stainless steel foil is used for reinforcement. The function of the release film is to facilitate sticking to the frame or the surface of the battery cell and is removed during installation.

[0020] Please continue reading Figure 1 As shown, in one embodiment of the utility model, a temperature sampling sensor 6 is fixed on the top of the plastic frame 2. The model of the temperature sampling sensor 6 is NTC100K.

[0021] Please continue reading Figure 2 As shown, in one embodiment of the utility model, the thickness of the first artificial graphite film 31 and the second artificial graphite film 36 is 0.09-0.11 mm, and the thickness of the first stainless steel foil 32 and the second stainless steel foil 37 is 0.06-0.08 mm.

[0022] The utility model has the following working principle: two single battery cells in the utility model are fixed on both sides of a plastic frame and the composite conductive insulation film is clamped with its maximum surface to form a finished group component. The composite conductive insulation film is composed of a first artificial graphite film, a first double-sided tape, a first stainless steel foil, a first double-sided tape, a first release film, an insulation film, a second release film, a second double-sided tape, a second stainless steel foil, a second double-sided tape, and a second artificial graphite film in a symmetrical layout, and at the same time has the heat dissipation required for normal use of the battery pack.

[0023] The above description is only a preferred embodiment of the present utility model and cannot be understood as a limitation of the present application. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall fall within the scope of the present utility model.

Claims

1. A soft-pack battery cell assembly with heat-conducting and heat-insulating functions, characterized in that: The soft-pack battery cell group assembly includes a single battery cell, a composite conductive thermal insulation film and a plastic frame. The single battery cells are respectively arranged on both sides of the plastic frame. Grooves capable of placing the single battery cells are provided on both side surfaces of the plastic frame. The composite conductive thermal insulation film is arranged between the single battery cells and fixed on the surface of the plastic frame.

2. A soft-pack battery cell assembly with heat-conducting and heat-insulating functions according to claim 1, characterized in that: A water cooling plate or a shell is fixed on the bottom of the composite heat-conducting and insulating film.

3. A soft-pack battery cell assembly with heat-conducting and heat-insulating functions according to claim 1, characterized in that: The composite conductive insulation film comprises an insulation film, wherein a first artificial graphite film, a first stainless steel foil, a first double-sided adhesive tape and a first release film are sequentially arranged on the left side of the insulation film, and a second artificial graphite film, a second stainless steel foil, a second double-sided adhesive tape and a second release film are sequentially arranged on the right side of the insulation film.

4. A soft-pack battery cell assembly with heat-conducting and heat-insulating functions according to claim 1, characterized in that: A temperature sampling sensor is fixed on the top of the plastic frame.

5. The soft-pack battery cell assembly with heat-insulating function according to claim 3, characterized in that: The thickness of the first artificial graphite film and the second artificial graphite film is 0.09-0.11 mm, and the thickness of the first stainless steel foil and the second stainless steel foil is 0.06-0.08 mm.

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