Battery pack cooling structure and battery pack assembly thereof

Abstract

The utility model discloses a battery pack cooling structure and a battery pack assembly thereof, the battery pack cooling structure comprises a runner plate structure arranged at the bottom of a battery pack box body, and the runner plate structure is provided with a flow inlet and a flow outlet which are used for allowing cooling liquid to flow in and out; the runner plate structure further comprises a runner plate upper shell, a runner plate lower shell, a first fin part and a second fin part, a runner for cooling liquid to flow is arranged between the runner plate upper shell and the runner plate lower shell, and the first fin part and the second fin part are fixedly arranged at the upper end and the lower end of the runner plate upper shell respectively. The first fin parts are arranged at two opposite side ends of the battery cell group; the second fin parts are arranged at intervals in the flowing direction of cooling liquid, and the lower ends of the second fin parts do not make contact with the inner surface of the runner plate lower shell. According to the utility model, the first fin part and the second fin part are arranged, so that the contact areas with the battery cell and the cooling liquid are respectively increased, and the heat exchange effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery cooling, specifically to a battery pack cooling structure and its battery pack assembly. Background Technology

[0002] As the demand for driving range of new energy vehicles continues to increase, the energy density of power batteries is getting higher and higher, which leads to a gradual increase in the heat generated by the battery pack. In order to better cool or heat the battery thermal management system, the thermal management performance of the battery pack needs to be further improved.

[0003] Existing thermal management systems typically cool battery cells using liquid cooling. Liquid cooling systems primarily rely on coolant to cool or heat the battery. A temperature difference exists between the battery cells and the coolant. The cells generate heat, rising to a higher temperature, which is then carried away by the coolant at a lower temperature. Alternatively, the liquid cooling system can heat the cells, thus achieving effective thermal management and keeping the cell temperature within a reasonable range. Cooling or heating the battery cells in a liquid cooling system mainly relies on the contact area between the cells and the liquid cooling plate, as well as the contact area between the liquid cooling plate and the coolant. The size of the contact area directly determines the amount of heat exchange. In existing liquid cooling systems, the contact area between the cells and the liquid cooling plate is relatively small, resulting in poor heat exchange and ultimately affecting the safety of the entire battery pack.

[0004] Therefore, it is urgent to propose a new solution to the above problems. Summary of the Invention

[0005] This invention provides a battery pack cooling structure and battery pack assembly, which can solve the problem in the prior art where the contact area between the battery cell and the liquid cooling plate is too small, resulting in poor heat exchange effect and ultimately affecting the safety of the entire battery pack.

[0006] This utility model provides a battery pack cooling structure, including a flow channel plate structure disposed at the bottom of the battery pack housing, wherein the flow channel plate structure is provided with an inlet and an outlet for coolant to enter and exit.

[0007] The flow channel plate structure also includes an upper shell of the flow channel plate, a lower shell of the flow channel plate, a first rib portion and a second rib portion. A flow channel for coolant flow is provided between the upper shell of the flow channel plate and the lower shell of the flow channel plate. The first rib portion and the second rib portion are respectively fixedly disposed at the upper and lower ends of the upper shell of the flow channel plate.

[0008] The first rib portion is disposed on two opposite ends of the cell assembly;

[0009] The second rib is provided at intervals along the flow direction of the coolant, and the lower end of the second rib does not contact the inner surface of the lower shell of the flow channel plate.

[0010] Furthermore, the height of the lower end of the second rib portion to the inner surface of the lower shell of the flow channel plate is 1 to 2 mm.

[0011] Furthermore, the width D2 of the second rib portion is 1 / 10 to 1 / 8 of the width D1 of the flow channel.

[0012] Furthermore, the surface of the second rib portion is provided with wavy protrusions along the flow direction of the coolant.

[0013] Furthermore, the inlet and outlet are located on the same side of the flow channel plate shell.

[0014] Furthermore, the second rib portion includes straight ribs located at the straight sections of the flow channel and curved ribs at the curved sections.

[0015] Furthermore, the first rib portion includes multiple spaced-apart first ribs, and the height of the first ribs is the same as the height of the battery cell assembly.

[0016] Furthermore, the outer shell of the flow channel plate, the first rib portion, and the second rib portion are manufactured in an integral molding manner.

[0017] Furthermore, each battery cell group comprises multiple battery cells arranged in parallel, and a thermally conductive structural adhesive is disposed between the first fin and the battery cells.

[0018] This utility model also provides a battery pack assembly, including the above-mentioned battery pack cooling structure.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. This utility model increases the contact area with the battery cell and coolant by setting a first rib and a second rib on the upper and lower surfaces of the flow channel plate shell, respectively, thereby improving the heat exchange effect. In addition, the first rib and the second rib also act as reinforcing ribs, improving the structural strength of the entire battery pack. Furthermore, the lower end of the second rib does not contact the inner surface of the flow channel plate lower shell, so that the coolant will generate turbulence when it encounters the second rib during the flow process, which enhances the friction between the coolant and the surface of the flow channel plate structure, thereby improving the convective heat transfer coefficient and further enhancing the heat exchange capacity.

[0021] 2. By setting curved ribs at the bends of the flow channel, this utility model can reduce the eddy current phenomenon of coolant at the corners, thereby reducing the pressure drop of the liquid cooling system to a certain extent. Attached Figure Description

[0022] Figure 1 This is an overall structural diagram of the battery pack cooling structure and battery pack housing of this utility model;

[0023] Figure 2 This is a top view of the overall structure of the battery pack cooling structure, battery pack housing, and battery cell assembly of this utility model.

[0024] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0025] Figure 4 This is a schematic diagram of the flow channel plate structure of this utility model excluding the first rib portion;

[0026] Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point B;

[0027] Figure 6 This is a cross-sectional view of the curved ribs in the flow channel;

[0028] Reference numerals in the attached drawings: 1. Battery pack housing; 11. Housing beam; 2. Cell assembly; 21. Cell; 3. Flow channel plate structure; 31. Inlet; 32. Outlet; 33. Upper shell of the flow channel plate; 34. Lower shell of the flow channel plate; 35. First rib section; 351. First rib; 36. Second rib section; 361. Straight rib; 362. Curved rib; 37. Flow channel. Detailed Implementation

[0029] To further understand the utility model's content, features, and effects, the following embodiments are provided, along with accompanying drawings. Figures 1-6 The details are as follows.

[0030] like Figures 1-6 As shown, this embodiment provides a battery pack cooling structure, including a flow channel plate structure 3 disposed at the bottom of the battery pack housing 1. In addition, a housing beam 11 is also bonded to the middle position of the bottom of the battery pack housing 1 by structural adhesive. The flow channel plate structure 3 is provided with an inlet 31 and an outlet 32 ​​for coolant to enter and exit.

[0031] The flow channel plate structure 3 also includes an upper shell 33 of the flow channel plate, a lower shell 34 of the flow channel plate, a first rib portion 35 and a second rib portion 36. A flow channel 37 for coolant flow is provided between the upper shell 33 of the flow channel plate and the lower shell 34 of the flow channel plate. The first rib portion 35 and the second rib portion 36 are respectively fixedly disposed at the upper and lower ends of the upper shell 33 of the flow channel plate.

[0032] The first rib portion 35 is disposed on two opposite sides of the cell assembly 2;

[0033] The second rib portion 36 is provided at intervals along the flow direction of the coolant, and the lower end of the second rib portion 36 does not contact the inner surface of the lower shell 34 of the flow channel plate.

[0034] This invention increases the contact area with the battery cell and coolant by setting a first rib and a second rib on the upper and lower surfaces of the flow channel plate shell, respectively, thereby improving the heat exchange effect. In addition, the first and second ribs also act as reinforcing ribs, improving the structural strength of the entire battery pack. Furthermore, the lower end of the second rib does not contact the inner surface of the flow channel plate lower shell, so that the coolant will generate turbulence when it encounters the second rib during flow, increasing the friction between the coolant and the surface of the flow channel plate structure, thereby improving the convective heat transfer coefficient and further enhancing the heat exchange capacity.

[0035] In this embodiment, as Figure 6 As shown, the height h from the lower end of the second rib portion 36 to the inner surface of the lower shell 34 of the flow channel plate is 1 to 2 mm.

[0036] In this embodiment, as Figure 5 As shown, the width D2 of the second rib portion 36 is 1 / 9 of the width D1 of the flow channel 37, but other values ​​between 1 / 10 and 1 / 8 can also be used.

[0037] In this embodiment, the surface of the second rib portion 36 is provided with wavy protrusions along the flow direction of the coolant, or it can be provided with depressions, which further increases the contact area.

[0038] In this embodiment, as Figure 2 As shown, the inlet 31 and outlet 32 ​​are located on the same side of the flow channel plate shell 33, which makes the flow channel longer and the cooling effect better.

[0039] In this embodiment, as Figure 4 and 5 As shown, the second rib portion 36 includes a straight rib 361 located at the straight part of the flow channel 37 and a curved rib 362 located at the curved part. The straight rib 361 is in the shape of a cuboid. By setting the curved rib at the curved part of the flow channel, this utility model can reduce the vortex phenomenon of the coolant at the corner, thereby reducing the pressure drop of the liquid cooling system to a certain extent.

[0040] In this embodiment, as Figure 2 and 3 As shown, the first rib portion 35 includes multiple spaced first ribs 351, the number of which is twice the number of the battery cell group. They are disposed at both ends of the battery cell group and spaced a certain distance apart to increase the heat dissipation area. The height of the first ribs 351 is the same as the height of the battery cell group 2. This design maximizes the contact area on the heat transfer path in the thermal management system, thereby enhancing the performance of the thermal management system.

[0041] In this embodiment, the upper shell 33 of the flow channel plate, the first rib portion 35 and the second rib portion 36 are manufactured by integral molding. In addition, the upper shell 33 of the flow channel plate and the lower shell 34 of the flow channel plate are connected by welding, which can increase the overall structural strength and make manufacturing more convenient.

[0042] In this embodiment, the upper shell 33 of the flow channel plate, the lower shell 34 of the flow channel plate, the first rib portion 35 and the second rib portion 36 are made of aluminum, which has better thermal conductivity. In addition, the single battery cell group 2 includes multiple battery cells 21 arranged in parallel. Thermally conductive structural adhesive is provided between the first rib 351 and the battery cell 21, which plays the role of absorbing tolerances and conducting heat.

[0043] This embodiment also provides a battery pack assembly, including the above-described battery pack cooling structure.

[0044] The above-described utility models are merely illustrative of embodiments of the present invention and should not be construed as limiting the scope of the utility model patent, nor are they intended to impose any limitation on the structure of the embodiments of the present invention. It should be noted that those skilled in the art can make various changes and improvements without departing from the concept of the embodiments of the present invention, and these all fall within the protection scope of the embodiments of the present invention.

Claims

1. A battery pack cooling structure, characterized in that: It includes a flow channel plate structure (3) located at the bottom of the battery pack housing (1), and the flow channel plate structure (3) is provided with an inlet (31) and an outlet (32) for coolant to enter and exit. The flow channel plate structure (3) further includes an upper shell (33), a lower shell (34), a first rib (35), and a second rib (36). A flow channel (37) for coolant flow is provided between the upper shell (33) and the lower shell (34). The first rib (35) and the second rib (36) are respectively fixedly disposed at the upper and lower ends of the upper shell (33). The first rib portion (35) is disposed on two opposite sides of the cell assembly (2); The second rib portion (36) is provided at intervals along the flow direction of the coolant, and the lower end of the second rib portion (36) does not contact the inner surface of the lower shell (34) of the flow channel plate.

2. The battery pack cooling structure according to claim 1, characterized in that: The height h from the lower end of the second rib portion (36) to the inner surface of the lower shell (34) of the flow channel plate is 1~2mm.

3. A battery pack cooling structure according to claim 1 or 2, characterized in that: The width D2 of the second rib portion (36) is 1 / 10 to 1 / 8 of the width D1 of the flow channel (37).

4. A battery pack cooling structure according to claim 1 or 2, characterized in that: The surface of the second rib portion (36) is provided with wavy protrusions along the flow direction of the coolant.

5. The battery pack cooling structure according to claim 1, characterized in that: The inlet (31) and outlet (32) are located on the same side of the flow channel plate shell (33).

6. The battery pack cooling structure according to claim 1, characterized in that: The second rib portion (36) includes a straight rib (361) located at the straight part of the flow channel (37) and a curved rib (362) located at the curved part.

7. A battery pack cooling structure according to claim 3, characterized in that: The first rib portion (35) includes multiple spaced first ribs (351), the height of which is the same as the height of the battery cell assembly (2).

8. The battery pack cooling structure according to claim 1, characterized in that: The upper shell (33), the first rib (35), and the second rib (36) of the flow channel plate are manufactured in one piece.

9. A battery pack cooling structure according to claim 7, characterized in that: The single battery cell group (2) includes multiple battery cells (21) arranged in parallel, and a thermally conductive structural adhesive is provided between the first rib (351) and the battery cells (21).

10. A battery pack assembly, characterized in that: Includes the battery pack cooling structure as described in any one of claims 1 to 9.

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