A cylindrical battery cell liquid cooling device

Abstract

The utility model relates to a cylindrical battery liquid cooling device, which adopts an annular shell to surround and form an installation space, and the cylindrical battery is adapted to be arranged in the installation space. The shell is a heat-conducting component, so that the heat emitted by the cylindrical battery can be conducted to the annular cavity inside the shell through the shell, and the annular cavity has a liquid inlet and a liquid outlet. Cooling liquid is input through the liquid inlet, and the heat in the annular cavity is taken out from the liquid outlet to achieve continuous cooling of the cylindrical battery. It can continuously liquid-cool the cylindrical battery around the cylindrical battery, and can better cool the cylindrical battery, so that the measured performance of the cylindrical battery is closer to the capacity at the set temperature. It solves the problem of temperature rise during charging and discharging of the cylindrical battery, and can more accurately test the actual performance of the battery at the set temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of constant temperature testing and temperature control of cylindrical battery cores, in particular to a liquid cooling device for cylindrical battery cores. Background Art

[0002] Due to the impact of charging anxiety among customers, the requirements for fast charging of battery cells are getting higher and higher. Since cylindrical battery cells have large internal resistance, their temperature rise is high during fast charging, so it is necessary to conduct constant temperature testing on cylindrical battery cells. At present, the temperature of a single cylindrical battery cell is generally controlled by a constant temperature box, and the constant temperature box maintains the temperature inside the box stable through air circulation. This has a good temperature control effect on the ambient temperature inside the constant temperature box, but when the temperature of the cylindrical battery cell body rises greatly, the cooling effect on the cylindrical battery cell is limited, and the cylindrical battery cell will continue to heat up, resulting in the measured cylindrical battery cell performance not being the capacity at the set temperature. Therefore, a cylindrical battery cell liquid cooling device with better temperature control is needed, which can better cool the cylindrical battery cell so that the measured cylindrical battery cell performance is closer to the capacity at the set temperature. Utility Model Content

[0003] The purpose of the utility model is to provide a cylindrical battery liquid cooling device, which can better cool the cylindrical battery cell so that the measured cylindrical battery cell performance is closer to the capacity at the set temperature, in view of the problem that when the prior art uses a constant temperature box to perform a constant temperature test on the cylindrical battery cell, the cooling effect on the cylindrical battery cell is limited, so that the measured cylindrical battery cell performance is not the capacity at the set temperature.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A cylindrical battery cell liquid cooling device comprises an annular shell, wherein the shell is a heat-conducting component, and the space surrounded by the shell is an installation space, wherein the installation space is used to accommodate the cylindrical battery cell, and an annular cavity is arranged inside the shell, wherein the annular cavity is arranged circumferentially around the shell, and the shell has a liquid inlet and a liquid outlet connecting the outside and the annular cavity.

[0006] The cylindrical battery cell liquid cooling device described in this scheme adopts an annular shell to form an installation space, and the cylindrical battery cell is adapted to be arranged in the installation space, that is, the installation space is slightly larger than the cylindrical battery cell, so that the cylindrical battery cell can be placed in the installation space, and it can be ensured that the distance between the cylindrical battery cell and the inner side of the annular shell is not too far; the shell is a heat-conducting component, so that the heat emitted by the cylindrical battery cell can be conducted through the shell to the annular cavity inside the shell, and the annular cavity has a liquid inlet and a liquid outlet, and the coolant is input through the liquid inlet to bring the heat in the annular cavity out from the liquid outlet, thereby realizing continuous cooling of the cylindrical battery cell, and it can continuously liquid-cool the cylindrical battery cell around the cylindrical battery cell, and can better cool the cylindrical battery cell, so that the measured cylindrical battery cell performance is closer to the capacity at the set temperature.

[0007] As a preferred embodiment of the present invention, the liquid inlet and the liquid outlet are located on the outside of the shell, the liquid inlet and the liquid outlet are located on opposite sides of the shell, the liquid inlet is located at the lower end of the shell, and the liquid outlet is located at the upper end of the shell.

[0008] The liquid inlet and the liquid outlet are located on the outside of the shell, which is convenient for access to the coolant; and avoids occupying the installation space, and avoids affecting the installation of the cylindrical battery cell in the installation space. The liquid inlet is located at the lower end of the shell, and the liquid outlet is located at the upper end of the shell. The liquid inlet and the liquid outlet are located on opposite sides of the shell, so that the coolant can basically fill the annular cavity, so that the coolant covers a wider area of ​​the cylindrical battery cell, the cooling of the cylindrical battery cell is more balanced, and the cooling effect is better.

[0009] As a preferred solution of the present invention, the inner diameter of the shell is 2 mm-5 mm larger than the outer diameter of the cylindrical battery core.

[0010] When the cylindrical battery cell is undergoing a constant temperature test, it may be necessary to wrap it and place it in an installation space. The film thickness is about 1 mm, and the inner diameter of the shell is 2 mm-5 mm larger than the outer diameter of the cylindrical battery cell, that is, the diameter of the installation space is 2 mm-5 mm larger than the outer diameter of the cylindrical battery cell, which facilitates the placement of the wrapped cylindrical battery cell into the installation space, and the diameter of the installation space is no more than 5 mm larger than the outer diameter of the cylindrical battery cell. The distance between the cylindrical battery cell and the shell is small, which has little effect on the heat transfer from the cylindrical battery cell to the shell and little effect on the cooling effect of the cylindrical battery cell.

[0011] As a preferred solution of the utility model, the width of the annular cavity along its radial direction is 1mm-2mm, and the annular cavity can be quickly filled with coolant while ensuring the cooling effect.

[0012] As a preferred embodiment of the utility model, the shell has an annular inner wall and an annular outer wall, an annular cavity is formed between the inner wall and the outer wall, the thickness of the inner wall is 1mm-2mm, and the thickness of the outer wall is 1mm-2mm, which ensures that the inner wall and the outer wall are not damaged when the coolant is poured in, while making the structural thickness as low as possible, reducing materials, saving costs, reducing weight, and facilitating use.

[0013] As a preferred solution of the present invention, when the cylindrical battery cell is placed in the installation space, the top of the cylindrical battery cell is 3 mm-5 mm higher than the top of the installation space.

[0014] When the cylindrical battery cell is placed in the installation space for constant temperature testing, the negative pole of the cylindrical battery cell faces upward, and the negative pole needs to be horizontally connected to the bar. The top of the cylindrical battery cell is 3mm-5mm higher than the top of the installation space. This can prevent the shell height from being too high and supporting the bar, thereby avoiding difficulties in setting the bar. The shell height cannot be too low, otherwise it will affect the cooling effect on the top of the cylindrical battery cell.

[0015] As a preferred solution of the utility model, a boss is provided at the inner bottom of the shell, the boss is arranged along the radial direction of the shell, and the boss is used to support the cylindrical battery core.

[0016] As a preferred solution of the utility model, the boss is an annular structure, the inner diameter of the boss is smaller than the diameter of the cylindrical battery core, and the inner diameter of the boss is larger than the diameter of the explosion-proof valve at the bottom of the cylindrical battery core.

[0017] First, it is considered that the cylindrical battery cell can be supported, that is, the inner diameter of the boss is smaller than the diameter of the cylindrical battery cell, so as to ensure the stability of the constant temperature test of the cylindrical battery cell; second, considering the uncontrolled valve opening of the cylindrical battery cell, a pressure relief path is required, that is, the inner diameter of the boss is larger than the diameter of the explosion-proof valve at the bottom of the cylindrical battery cell.

[0018] As a preferred solution of the utility model, the boss and the shell are integrally formed, and the structure has good integrity and is more stable.

[0019] As a preferred solution of the utility model, the shell is an aluminum component, which has low cost, light weight and is easy to use while meeting the thermal conductivity requirements.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0021] 1. The cylindrical battery cell liquid cooling device of the utility model adopts an annular shell to surround and form an installation space, and the cylindrical battery cell is adapted to be arranged in the installation space. The shell is a heat-conducting component, so that the heat emitted by the cylindrical battery cell can be conducted to the annular cavity inside the shell through the shell, and the annular cavity has a liquid inlet and a liquid outlet. Coolant is input through the liquid inlet, and the heat in the annular cavity is taken out from the liquid outlet to achieve continuous cooling of the cylindrical battery cell. It can continuously liquid-cool the cylindrical battery cell around the cylindrical battery cell, and can better cool the cylindrical battery cell, so that the measured cylindrical battery cell performance is closer to the capacity at the set temperature. It solves the problem of temperature rise during charging and discharging of the cylindrical battery cell, and can more accurately test the actual performance of the battery cell at the set temperature.

[0022] 2. In the cylindrical battery cell liquid cooling device of the utility model, a boss is provided at the inner bottom of the shell, and the boss is a ring-shaped structure. The inner diameter of the boss is smaller than the diameter of the cylindrical battery cell, so that the cylindrical battery cell can be stably supported. The inner diameter of the boss is larger than the diameter of the explosion-proof valve at the bottom of the cylindrical battery cell, so that the valve can be opened to release pressure when the cylindrical battery cell loses control. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the cylindrical battery core liquid cooling device of the utility model;

[0024] Figure 2 yes Figure 1 Sectional view at AA in the middle;

[0025] Figure 3 yes Figure 1 Sectional view at the middle BB;

[0026] Figure 4 It is a schematic diagram of using the cylindrical battery cell liquid cooling device of the utility model during the constant temperature test of the cylindrical battery cell.

[0027] Icons: 1-shell; 101-inner wall; 102-outer wall; 11-annular cavity; 12-boss; 2-installation space; 31-liquid inlet; 32-liquid outlet; 4-connecting pipe; 51-lower base; 52-upper base; 53-column; 6-cylindrical battery cell; 7-bar. DETAILED DESCRIPTION

[0028] The utility model is described in detail below in conjunction with the accompanying drawings.

[0029] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0030] Example 1

[0031] This embodiment provides a cylindrical battery core liquid cooling device, see Figure 1-Figure 3 , including an annular shell 1, the shell 1 is a heat-conducting component, the space surrounded by the shell 1 is an installation space 2, the installation space 2 is used to accommodate a cylindrical battery cell 6, an annular cavity 11 is provided in the shell 1, the annular cavity 11 is circumferentially arranged around the shell 1, and the shell 1 has a liquid inlet 31 and a liquid outlet 32 ​​connecting the outside and the annular cavity 11.

[0032] In this scheme, if Figure 2 As shown, the installation space 2 is the inner space surrounded by the entire shell 1; the annular cavity 11 is the interior of the shell 1, and within the allowable error range, the annular cavity 11, the shell 1 and the installation space 2 can be coaxial.

[0033] In this solution, the shell 1 is a heat-conducting component, which needs to realize heat conduction from the cylindrical battery core 6 to the annular cavity 11, and can be made of a heat-conducting material, and the heat-conducting material needs to have a certain hardness to form an annular shell 1. In this embodiment, as a preferred choice, the shell 1 is an aluminum component, which has low cost, light weight and is easy to use while meeting the thermal conductivity performance.

[0034] In this scheme, if Figure 4 As shown, the installation space 2 is used to accommodate the cylindrical battery cell 6, that is, the installation space 2 is slightly larger than the cylindrical battery cell 6, so that the cylindrical battery cell 6 can be placed in the installation space 2, and the distance between the cylindrical battery cell 6 and the inner side of the annular shell 1 can be ensured not to be too far, so as to avoid poor heat transfer between the installation space 2 and the shell 1. In this embodiment, the diameter of the cylindrical battery cell 6 can be 18mm, 21mm, 27mm, 46mm, etc. As a preferred embodiment, the inner diameter of the shell 1 is 2mm-5mm larger than the outer diameter of the cylindrical battery cell 6. Specifically, when the cylindrical battery cell 6 is undergoing a constant temperature test, it may need to be coated and placed in the installation space 2, with a film thickness of about 1 mm. The inner diameter of the shell 1 is 2 mm-5 mm larger than the outer diameter of the cylindrical battery cell 6, that is, the diameter of the installation space 2 is 2 mm-5 mm larger than the outer diameter of the cylindrical battery cell 6, so that the coated cylindrical battery cell 6 can be placed in the installation space 2, and the diameter of the installation space 2 is no more than 5 mm larger than the outer diameter of the cylindrical battery cell 6. The distance between the cylindrical battery cell 6 and the shell 1 is small, which has little effect on the heat transfer from the cylindrical battery cell 6 to the shell 1 and little effect on the cooling effect of the cylindrical battery cell 6.

[0035] In this scheme, if Figure 2 and Figure 3As shown, the width of the annular cavity 11 along its radial direction needs to ensure the cooling effect on the cylindrical battery core 6. As a preferred embodiment, the width of the annular cavity 11 along its radial direction is 1mm-2mm, and the annular cavity 11 can be quickly filled with coolant while ensuring the cooling effect. At the same time, the annular cavity 11 is located in the shell 1, and the shell 1 has an annular inner wall 101 and an annular outer wall 102. The inner wall 101 and the outer wall 102 form an annular cavity 11, and the thickness of the inner wall 101 and the outer wall 102 needs to ensure that they are not damaged when the coolant is poured in, or in other words, the wall thickness of the shell 1 needs to ensure that they are not damaged when the coolant is poured in. In this embodiment, the thickness of the inner wall 101 is 1mm-2mm, and the thickness of the outer wall 102 is 1mm-2mm. While ensuring that the inner wall 101 and the outer wall 102 are not damaged when the coolant is poured in, the thickness of the structure is as low as possible, reducing materials, saving costs, reducing weight, and facilitating use.

[0036] In this embodiment, taking the cylindrical battery cell 6 with a diameter of 46 mm as an example, the inner diameter of the shell 1 is approximately 48 mm, the thickness of the inner wall 101 is 1 mm-2 mm, the thickness of the outer wall 102 is 1 mm-2 mm, the width of the annular cavity 11 along its radial direction is 1 mm-2 mm, and the diameter of the outer side of the shell 1 is approximately 54 mm-62 mm.

[0037] In this embodiment, the setting of the liquid inlet 31 and the liquid outlet 32 ​​needs to enable the coolant flowing in the annular cavity 11 to take away the heat dissipated by the cylindrical battery cell 6. As a preferred embodiment, the liquid inlet 31 and the liquid outlet 32 ​​are located on the outside of the shell 1, which is convenient for access to the coolant; and avoid occupying the installation space 2, and avoid affecting the installation of the cylindrical battery cell 6 in the installation space 2. The liquid inlet 31 and the liquid outlet 32 ​​are located on opposite sides of the shell 1, the liquid inlet 31 is located at the lower end of the shell 1, and the liquid outlet 32 ​​is located at the upper end of the shell 1, so that the coolant can basically fill the annular cavity 11, so that the coolant covers a wider area of ​​the cylindrical battery cell 6, the cooling of the cylindrical battery cell 6 is more balanced, and the cooling effect is better.

[0038] As a preferred implementation method, Figure 1 As shown, Figure 1 The positions of the liquid inlet 31 and the liquid outlet 32 ​​are schematically shown; the liquid inlet 31 and the liquid outlet 32 ​​are respectively provided with a connecting pipe 4, which is convenient for connecting with the transmission pipe of the coolant. Among them, the connecting pipe 4 is arranged horizontally to avoid backflow. And more preferably, the connecting pipe 4 and the shell 1 are an integrally formed structure, which has good structural integrity and is more stable, and avoids the need for further consideration of sealing at the connection between the connecting pipe 4 and the liquid inlet 31 and the liquid outlet 32.

[0039] In this embodiment, when the cylindrical battery cell 6 is placed in the installation space 2 for constant temperature testing, the negative pole of the cylindrical battery cell 6 faces upward, and the negative pole needs to be horizontally connected to the bar 7. The top of the cylindrical battery cell 6 is 3mm-5mm higher than the top of the installation space 2. This can prevent the shell 1 from being too high and supporting the bar 7, thereby avoiding difficulties in setting the bar 7. The height of the shell 1 cannot be too low, otherwise it will affect the cooling effect on the top of the cylindrical battery cell 6.

[0040] As a preferred embodiment, a boss 12 is provided at the inner bottom of the shell 1, and the boss 12 is arranged along the radial direction of the shell 1, and the boss 12 is used to support the cylindrical battery cell 6. Among them, the boss 12 mainly supports the cylindrical battery cell 6 upward and stably, and its arrangement form can be multiple and spaced along the circumference of the shell 1, or it can be continuously arranged along the circumference of the shell 1 to form a whole. In this embodiment, the boss 12 is an annular structure, and the inner diameter of the boss 12 is smaller than the diameter of the cylindrical battery cell 6, which can support the cylindrical battery cell 6 and ensure the stability of the constant temperature test of the cylindrical battery cell 6; the inner diameter of the boss 12 is larger than the diameter of the explosion-proof valve at the bottom of the cylindrical battery cell 6, considering the uncontrolled opening of the valve of the cylindrical battery cell 6, it can better relieve pressure.

[0041] As a preferred implementation, the boss 12 and the housing 1 are integrally formed, and the structure has good integrity and is more stable.

[0042] The cylindrical battery cell liquid cooling device described in this embodiment adopts an annular shell 1 to form an installation space 2 around, and the cylindrical battery cell 6 is adapted to be arranged in the installation space 2. The shell 1 is a heat-conducting component, so that the heat emitted by the cylindrical battery cell 6 can be conducted to the annular cavity 11 inside the shell 1 through the shell 1, and the annular cavity 11 has a liquid inlet 31 and a liquid outlet 32. The coolant is input through the liquid inlet 31, and the heat in the annular cavity 11 is taken out from the liquid outlet 32 ​​to achieve continuous cooling of the cylindrical battery cell 6. It can continuously liquid-cool the cylindrical battery cell 6 around the cylindrical battery cell 6, and can better cool the cylindrical battery cell 6, so that the measured performance of the cylindrical battery cell 6 is closer to the capacity at the set temperature. In this embodiment, the coolant can be cooling water, or a mixed liquid of water and ethylene glycol mixed in a mass ratio of 1:1, and other liquids with cooling effect, which can flow in the annular cavity 11.

[0043] Before performing a constant temperature test on the cylindrical battery cell 6, install the cylindrical battery cell liquid cooling device on the base of the constant temperature test device of the cylindrical battery cell 6 to prevent the cylindrical battery cell liquid cooling device from moving. Figure 4The base includes a lower base 51 and an upper base 52, which are connected and fixed by bolts, the bottom of the shell 1 is embedded between the lower base 51 and the upper base 52, and the connecting pipe of the liquid inlet 31 is embedded between the lower base 51 and the upper base 52; then the cylindrical battery cell 6 is installed in the cylindrical battery cell liquid cooling device installation space 2, so that the shell 1 wraps the cylindrical battery cell 6, and the negative electrode of the cylindrical battery cell 6 faces upward, and the negative electrode of the cylindrical battery cell 6 is connected to the columns 53 on both sides of the base through the bar sheet 7 to form a fixation;

[0044] When the cylindrical battery cell 6 is subjected to a constant temperature test, a water cooler or other device that provides coolant is connected to the liquid inlet 31, the coolant temperature is set as the target temperature, and the flow rate is appropriately adjusted according to the temperature rise of the battery cell during charge and discharge. The coolant can be used to cool the battery cell body in real time to achieve a constant temperature test of the battery cell. This solves the problem of temperature rise during charge and discharge of the cylindrical battery cell 6 and can more accurately test the actual performance of the battery cell at the set temperature.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cylindrical battery cell liquid cooling device, characterized in that: The invention comprises an annular shell (1), the shell (1) being a heat-conducting component, the space surrounded by the shell (1) being an installation space (2), the installation space (2) being used to accommodate and arrange a cylindrical battery core (6), an annular cavity (11) being arranged in the shell (1), the annular cavity (11) being arranged circumferentially around the shell (1), the shell (1) having a liquid inlet (31) and a liquid outlet (32) communicating with the outside and the annular cavity (11); the inner diameter of the shell (1) is 2 mm to 5 mm larger than the outer diameter of the cylindrical battery core (6).

2. The cylindrical battery core liquid cooling device according to claim 1, characterized in that: The liquid inlet (31) and the liquid outlet (32) are located on the outside of the shell (1), the liquid inlet (31) and the liquid outlet (32) are located on opposite sides of the shell (1), the liquid inlet (31) is located at the lower end of the shell (1), and the liquid outlet (32) is located at the upper end of the shell (1).

3. The cylindrical battery core liquid cooling device according to claim 1, characterized in that: The width of the annular cavity (11) along its radial direction is 1 mm to 2 mm.

4. The cylindrical battery core liquid cooling device according to claim 3, characterized in that: The shell (1) has an annular inner wall (101) and an annular outer wall (102); an annular cavity (11) is formed between the inner wall (101) and the outer wall (102); the thickness of the inner wall (101) is 1 mm to 2 mm, and the thickness of the outer wall (102) is 1 mm to 2 mm.

5. The cylindrical battery core liquid cooling device according to claim 1, characterized in that: When the cylindrical battery cell (6) is placed in the installation space (2), the top of the cylindrical battery cell (6) is 3 mm to 5 mm higher than the top of the installation space (2).

6. The cylindrical battery core liquid cooling device according to any one of claims 1 to 5, characterized in that: A boss (12) is provided at the inner bottom of the shell (1), the boss (12) is arranged along the radial direction of the shell (1), and the boss (12) is used to support the cylindrical battery core (6).

7. The cylindrical battery core liquid cooling device according to claim 6, characterized in that: The boss (12) is an annular structure, the inner diameter of the boss (12) is smaller than the diameter of the cylindrical battery core (6), and the inner diameter of the boss (12) is larger than the diameter of the explosion-proof valve at the bottom of the cylindrical battery core (6).

8. The cylindrical battery core liquid cooling device according to claim 7, characterized in that: The boss (12) and the shell (1) are integrally formed.

9. The cylindrical battery core liquid cooling device according to any one of claims 1 to 5, characterized in that: The housing (1) is an aluminum component.

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