CN103746153A - Ultra-high capacity energy storage lithium ion battery pack heat dissipation apparatus - Google Patents

Abstract

The invention relates to a cooling device for a super-large-capacity energy storage lithium-ion battery pack, which includes a lithium-ion battery pack, water-cooled long fins on a partition, a water-cooled coil wall, a fan, and a battery box; A water-cooled coil wall is arranged vertically between two rows of battery packs, and a separator water-cooled long fin is arranged horizontally between two adjacent lithium-ion battery packs. The lithium-ion battery pack is placed on the separator water-cooled long fin and is cooled by the separator water Long fins are supported and fixed; a fan is installed on each layer of each row of battery packs for air supply to accelerate heat dissipation; by adding separators with water-cooled long fins, water-cooled coil walls and fans, it solves the problem of super-large capacity The heat dissipation problem of the battery pack. The invention has the advantages of simple structure, uniform heat dissipation, high working efficiency of the lithium-ion battery pack, long service life and safety.

Description

Cooling device for ultra-large capacity energy storage lithium-ion battery pack

technical field

The invention relates to a cooling device for a super-large-capacity energy-storage lithium-ion battery pack, which belongs to the technical field of new energy.

Background technique

Lithium-ion batteries have the characteristics of high storage energy density, low self-discharge rate, no memory effect, high energy conversion efficiency, and no pollution to the environment. In recent years, they have played an important role in high-power storage applications. However, high-power lithium-ion batteries will generate a lot of heat during charging and discharging, and the heat distribution is uneven. The heat in the middle of the battery box is not easy to be taken away in time. If it is not dissipated in time, the temperature of the battery will rise too high. , affecting the charging and discharging efficiency of the battery, reducing the service life of the battery and destroying the safety of its use. The existing technology generally adopts forced ventilation to take away the heat on the surface of the battery pack. However, due to the large heat generation of the super-large-capacity lithium-ion battery pack, the effect of forced ventilation is not ideal, and the heat in the place where the battery packs are densely packed inside the battery box It is not easy to distribute in time. This will lead to increased temperature of the battery pack, low efficiency, short service life, and unsafety.

Contents of the invention

The invention discloses a cooling device for an ultra-large-capacity energy-storage lithium-ion battery pack, which utilizes a water-cooled long-fin heat dissipation system to radiate and cool the battery pack, rationally arranges water-cooled coil walls and fans, and performs forced ventilation to dissipate heat to form a lithium-ion battery The heat dissipation device of the group, in order to achieve a good heat dissipation effect of the lithium-ion battery pack. The invention can effectively overcome the unsatisfactory heat dissipation effect caused by the simple use of forced ventilation in the prior art, especially where the battery packs are densely packed, it is not easy to dissipate heat, which leads to increased temperature of the battery pack, low efficiency, short service life, and unsafety and other disadvantages.

Technical solution of the present invention is realized in that way:

A cooling device for a super-large-capacity energy storage lithium-ion battery pack, including a lithium-ion battery pack, water-cooled long fins on a partition, a water-cooled coil wall, a fan, and a battery box; A water-cooled coil wall is arranged vertically between the battery packs, and a separator water-cooled long fin is arranged horizontally between two adjacent lithium-ion battery packs. The lithium-ion battery pack is placed on the separator water-cooled long fin, and the separator water-cooled long fin Support and fix the sheet; install a fan on each layer of each row of battery packs for air supply to accelerate heat dissipation; add water-cooled long fins on the partitions, water-cooled coil walls and fans to solve the problem of super-large-capacity battery packs cooling problem.

The wall structure of the water-cooled coil is a serpentine coil, and the material is copper.

The water-cooled long fins of the partition are welded on the wall of the water-cooled coil, and the materials of the long water-cooled fins of the partition are all steel plates with good thermal conductivity.

The super-large-capacity energy-storage lithium-ion battery heat dissipation device designed by the present invention can effectively and timely take away the heat of the super-large-capacity lithium-ion battery pack, and dissipate heat evenly, not only achieving the effect of timely heat dissipation in the lithium-ion battery box, but also ensuring that the lithium-ion It not only improves the working environment of the battery pack, but also improves the working efficiency of the lithium-ion battery pack, prolongs its service life, and ensures its safety in use. At the same time, the heat of the lithium-ion battery pack recovered by the cooling water can be reused.

Description of drawings

Fig. 1 is a top view structural diagram of a cooling device for a super-large capacity energy storage lithium-ion battery pack;

Fig. 2 is the side view structural diagram of the cooling device of the ultra-large capacity energy storage lithium-ion battery pack;

Fig. 3 Schematic diagram of the structure of the water-cooled coil.

1. Lithium-ion battery pack, 2. Separator water-cooled long fins, 3. Water-cooled coil wall, 4. Fan, 5. Battery box, 6. Cold water inlet, 7. Cold water outlet.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and examples, but the examples are not intended to limit the present invention, and all similar structures and similar changes of the present invention should be included in the protection scope of the present invention.

A cooling device for an ultra-large-capacity energy-storage lithium-ion battery pack, as shown in Figures 1 and 2, includes a lithium-ion battery pack 1, a partition plate with water-cooled long fins 2, a water-cooled coil wall 3, a fan 4, and a battery box 5 ; A water-cooled coil wall 3 is vertically arranged between two adjacent rows of lithium-ion battery packs in the battery case, and a separator water-cooled long fin 2 is arranged horizontally between adjacent two-layer lithium-ion battery packs. On the water-cooled long fins 2 of the separator, it is supported and fixed by the water-cooled long fins of the separator; a fan 4 is installed on each layer of each row of lithium-ion battery packs for air supply to accelerate heat dissipation; by adding The water-cooled long fins 2 of the clapboard, the water-cooled coil wall 3 and the fan 4 solve the heat dissipation problem of the ultra-large-capacity battery pack. As shown in FIG. 3 , the structure of the water-cooling coil wall 3 is a serpentine coil, and the material is copper. The water-cooled long fins 2 of the partition are welded on the water-cooled coil wall 3, and the material of the water-cooled long fins of the partition is a steel plate with good thermal conductivity.

The water-cooled long fins 2 of the separator support the battery pack and also act as heat-conducting fins, and exchange heat with the water-cooled coil wall 3 in the form of heat conduction, which increases the heat dissipation area of the lithium-ion battery pack and improves heat transfer. efficiency, making the heat sink compact. A fan 4 is installed on each layer of each row of lithium-ion battery packs, and the outdoor air is introduced into the room from one side of the battery box 5, and the lithium-ion battery packs are horizontally supplied with air, which enhances air flow and strengthens the connection with the water cooling plate. The convective heat exchange between the tube wall 3 and the surface of the lithium-ion battery 1 is then discharged to the outside from the other side of the battery box 5 . Cooling water enters the serpentine water-cooling coil wall 3 from the cold water inlet 6, and the heated cooling water is led to the outside through the cold water outlet 7, and then the temperature of the cooling water is lowered to the designed inlet temperature by the cooling tower or heat user.

Example:

The calorific value of a single lithium-ion battery during normal charging and discharging is 1.2w, and its geometric size is 65*18*120 (mm). The heat dissipation load designed for a unit is 5Kw, so the body should accommodate 4166 lithium-ion batteries. 7 rows of lithium-ion battery packs are distributed in the battery box, and each row of lithium-ion battery packs is arranged horizontally with 60 individual batteries. Every two adjacent lithium-ion battery cells are separated by 5mm, and 10 layers of battery strips are arranged vertically. Each layer of separators The distance between the water-cooled long fins 2 is 150 mm. A serpentine water-cooling coil wall 3 is arranged between each adjacent two rows of lithium-ion battery packs, and there are 6 drain cooling coil walls in total. The heat absorption of the cooling water is 5kw, the inlet temperature of the cooling water is set to 20°C, and the outlet temperature is set to 30°C, then the total flow rate is 0.013kg/s. The cooling of circulating cooling water adopts conventional methods, for example, cooling tower or large-capacity natural evaporation and air cooling can be used. The diameter of the tube bundle is 3.2mm, and the total length of the tube bundle is 100m. According to hydrodynamic calculation, the flow state of the cooling water in the tube is forced turbulence, and the Reynolds number is 1.03×10 ⁴ . The working environment of the battery box is set at 30°C, and the wind speed inside the battery box is 2.5m/s through heat transfer calculations. The distance between the lithium-ion battery cell and the tube bundle is 2mm, so each layer should provide an air volume of 20L/s.

Claims (3)

1. A cooling device for super-large-capacity energy storage lithium-ion battery packs, including lithium-ion battery packs (1), separator water-cooled long fins (2), water-cooled coil walls (3), fans (4), and battery boxes (5); It is characterized in that: a water-cooled coil wall (3) is arranged longitudinally between two adjacent rows of battery packs in the battery box, and a separator water-cooled long fin is arranged horizontally between two adjacent layers of lithium-ion battery packs (2), the lithium-ion battery pack is placed on the water-cooled long fins of the separator (2), supported and fixed by the water-cooled long fins of the separator; a fan (4) is installed on each layer of each row of battery packs , for air supply to speed up heat dissipation; by adding partitions with water-cooled long fins, water-cooled coil walls and fans, the problem of heat dissipation for super-large-capacity battery packs is solved. 2. The cooling device for super-large-capacity energy-storage lithium-ion battery packs according to claim 1, characterized in that: the water-cooled coil wall (3) is structured as a serpentine coil and made of red copper. 3. The cooling device for super-large-capacity energy storage lithium-ion battery packs according to claim 1, characterized in that: the water-cooled long fins (2) of the separator are welded to the water-cooled coil wall (3), and the separator is water-cooled The long fin material adopts the steel plate with thermal conductivity.

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