Cylindrical cell battery pack liquid cooling assembly

Abstract

The utility model provides a liquid cooling assembly for a cylindrical battery cell battery pack, which is characterized in that battery cell units arranged in a matrix manner are vertically arranged in a fixed frame, flat and long strip-shaped cooling plates with vertical plate surfaces are arranged on two sides of each row or column of battery cell units, and bottom cooling plates attached to the bottom surfaces of battery cells are arranged between the battery cell units and a bottom plate; and the strip-shaped cooling plate and the bottom cooling plate are respectively provided with a water inlet and a water outlet. According to the utility model, through the matching of the strip-shaped cooling plate and the bottom cooling plate, the heat exchange area of the battery cell is increased, the cooling speed of the battery cell is improved, the uniformity of the cooling operation of the battery cell is ensured, and the output performance of the battery cell is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of battery thermal management, in particular to a liquid cooling component for a cylindrical battery pack. Background Art

[0002] The temperature environment changes in the power battery pack of electric vehicles will have a huge impact on the reliability, life, performance and other aspects of the battery cells. Therefore, the temperature in the power battery pack needs to be maintained within a certain range, which is mainly achieved by cooling or heating the battery cells through the battery thermal management system. The thermal management system of the battery pack is very important, but the traditional battery pack cooling design generally has problems such as uneven cooling temperature of the battery cells and poor cooling efficiency.

[0003] The patent titled "A bottom plate liquid-cooled battery module with honeycomb heat dissipation channels" (CN113363618A) discloses a technical solution that provides a honeycomb liquid-cooled heat dissipation channel in the liquid cooling plate below the cylindrical battery, which can solve the heat dissipation problem at the bottom of the battery cell. However, this solution only cools the bottom of the battery cell, resulting in uneven cooling rates at different parts of the battery cell, which reduces the battery life and electrical performance. Utility Model Content

[0004] The utility model aims to provide a cylindrical battery cell liquid cooling assembly, which can efficiently and evenly realize the cooling operation of the battery cell group.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a liquid cooling component of a cylindrical battery pack, in which the battery cells arranged in a matrix are upright arranged in a fixed frame, and the fixed frame includes an upper cover located above the battery cell unit, a side frame surrounding the outer side of the battery cell unit group and a bottom plate located below the battery cell unit, characterized in that: flat and long strip cooling plates are arranged on both sides of each row of battery cell units along the width direction of the vehicle or each column of battery cell units along the length direction of the vehicle, the plate surface of the strip cooling plate is arranged vertically and a first water inlet and a first water outlet are respectively provided at both ends, a bottom cooling plate is provided between the battery cell unit and the bottom plate, the upper plate surface of the bottom cooling plate is in contact with the bottom surface of the battery cell unit, a second water inlet is provided at the edge of the bottom cooling plate close to the first water inlet, and a second water outlet is provided at the other edge close to the first water outlet.

[0006] The utility model mainly arranges a strip cooling plate and a bottom cooling plate on the side and bottom of the battery cell respectively, and performs cooling operation on the battery cell together. The cooperation of the strip cooling plate and the bottom cooling plate increases the heat exchange area of ​​the battery cell, thereby improving the cooling speed of the battery cell. In addition, heat exchange is performed on the side and bottom of the battery cell at the same time, which can effectively ensure the uniformity of the cooling operation of the battery cell, which is beneficial to the output performance of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1This is an exploded view of a cylindrical cell battery pack;

[0008] Figure 2 A schematic diagram of the cooperation between the strip cooling plate and the bottom cooling plate;

[0009] Figure 3 Schematic diagram of the bottom cooling plate. DETAILED DESCRIPTION

[0010] See also Figure 1-3 The cylindrical battery pack liquid cooling assembly shown has battery cells A arranged in a matrix and arranged upright in a fixed frame 1, the fixed frame 1 includes an upper cover 2 located above the battery cell units A, a side frame 3 surrounding the circumferential outside of the battery cell unit A group and a bottom plate 4 located below the battery cell units A, and long and flat strip cooling plates 10 are arranged on both sides of each row of battery cell units A along the width direction of the vehicle or each column of battery cell units A along the length direction of the vehicle, the plate surface of the strip cooling plate 10 is arranged vertically and a first water inlet 11 and a first water outlet 12 are respectively provided at both ends, a bottom cooling plate 20 is provided between the battery cell units A and the bottom plate 4, the upper plate surface of the bottom cooling plate 20 is in contact with the bottom surface of the battery cell units A, a second water inlet 21 is provided at the edge of the bottom cooling plate 20 near the first water inlet 11, and a second water outlet 22 is provided at the other edge of the bottom cooling plate 20 near the first water outlet 12.

[0011] In the above scheme, the battery cells A arranged in a matrix are combined into a battery pack and installed on the chassis of the car through a fixed frame 1. The first water inlet 11 and the second water inlet 21 are arranged on the same side, and the first water outlet 12 and the second water outlet 22 are arranged on the same side to facilitate the arrangement of the pipelines inside the vehicle. The strip cooling plate 10 and the bottom cooling plate 20 are in contact with the circumferential side and bottom of the battery cell A respectively. The two work together to improve the cooling efficiency of the battery cell to ensure the control of the temperature gradient and the extreme temperature during high-power charging and discharging of the power battery. The strip cooling plate 10 and the bottom cooling plate 20 increase the heat exchange area of ​​the battery cell A, making the heat exchange more uniform, which is beneficial to the output performance of the battery cell.

[0012] In order to save the layout space inside the battery pack, two adjacent rows or columns of battery cell units A share a strip-shaped cooling plate 10 .

[0013] In order to preliminarily fix the battery cell unit A on the bottom cooling plate 20, a recess 23 that fits with the bottom surface of the battery cell unit A is provided on the upper plate surface of the bottom cooling plate 20, and the bottom of the battery cell unit A is embedded in the recess 23. In the above scheme, the bottom cooling plate 20 is composed of a flow channel plate inside and a stamping plate on the surface, which are combined by brazing, integrated with the lower shell of the power battery, and connected by welding. The battery cell unit A is embedded in the recess 23, which can not only preliminarily fix the battery cell unit A, but also increase the contact area between the battery cell unit A and the bottom cooling plate 20, thereby improving its cooling efficiency. After all high and low pressure circuits, liquid cooling pipelines and other components in the battery pack are assembled, all components in the battery pack are finally fixed using polyurethane using a foaming process.

[0014] In order to improve the heat exchange efficiency of the strip cooling plate 10, the plate surface of the strip cooling plate 10 is a wavy curved surface that fits the circumference of the battery cell unit A. In the above scheme, the strip cooling plate 10 is extruded from a profile and then bent according to the diameter of the battery cell unit A during manufacturing to achieve the purpose of closely fitting the side of the cylindrical battery cell unit A. The surface of the strip cooling plate 10 is sprayed with insulating paint and thermal conductive structural glue to achieve the effect of insulation and rapid heat conduction.

[0015] Preferably, the height of the strip cooling plate 10 is less than or equal to the height of the battery cell unit A, so as to ensure that other components connected to the battery cell unit A are not interfered.

[0016] In order to cool the strip cooling plate 10 and the bottom cooling plate 20 synchronously, the liquid inlet pipelines of the first water inlet 11 and the second water inlet 21 are connected in parallel, and the liquid outlet pipelines of the first water outlet 12 and the second water outlet 22 are connected in parallel.

[0017] In order to facilitate the connection of the pipe joint of the bottom cooling plate 20 , the second water inlet 21 and the second water outlet 22 extend vertically upward from the upper plate surface of the bottom cooling plate 20 .

Claims

1. A cylindrical cell battery pack liquid cooling assembly, wherein the cell units (A) arranged in a matrix are arranged upright in a fixed frame (1), the fixed frame (1) comprises an upper cover (2) located above the cell units (A), a side frame (3) surrounding the cell units (A) on the outer side of the circumference, and a bottom plate (4) located below the cell units (A), characterized in that: A flat and long strip cooling plate (10) is arranged on both sides of each row of battery cells (A) along the width direction of the vehicle or each column of battery cells (A) along the length direction of the vehicle. The plate surface of the strip cooling plate (10) is arranged vertically and a first water inlet (11) and a first water outlet (12) are respectively provided at both ends. A bottom cooling plate (20) is provided between the battery cells (A) and the bottom plate (4). The upper plate surface of the bottom cooling plate (20) is in contact with the bottom surface of the battery cells (A). A second water inlet (21) is provided at the edge of the bottom cooling plate (20) close to the first water inlet (11). A second water outlet (22) is provided at the other edge of the bottom cooling plate (20) close to the first water outlet (12).

2. The cylindrical cell battery pack liquid cooling assembly according to claim 1, characterized in that: Two adjacent rows or columns of battery cell units (A) share a strip-shaped cooling plate (10).

3. The cylindrical cell battery pack liquid cooling assembly according to claim 1 or 2, characterized in that: A recess (23) that engages with the bottom surface of the battery cell unit (A) is provided on the upper plate surface of the bottom cooling plate (20), and the bottom of the battery cell unit (A) is embedded in the recess (23).

4. The cylindrical cell battery pack liquid cooling assembly according to claim 2, characterized in that: The plate surface of the strip-shaped cooling plate (10) is a wavy curved surface that fits the peripheral surface of the battery cell unit (A).

5. The cylindrical cell battery pack liquid cooling assembly according to claim 1, 2 or 4, characterized in that: The height of the strip-shaped cooling plate (10) is less than or equal to the height of the battery core unit (A).

6. The cylindrical cell battery pack liquid cooling assembly according to claim 1, characterized in that: The liquid inlet pipelines of the first water inlet (11) and the second water inlet (21) are connected in parallel, and the liquid outlet pipelines of the first water outlet (12) and the second water outlet (22) are connected in parallel.

7. The cylindrical cell battery pack liquid cooling assembly according to claim 1, characterized in that: The second water inlet (21) and the second water outlet (22) extend vertically upward from the upper plate surface of the bottom cooling plate (20).

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