Immersed battery pack box body and battery pack

Abstract

The utility model discloses an immersion type battery pack box body and battery pack, the immersion type battery pack box body comprises a box body base, the box body base is provided with an inlet flow channel, an outlet flow channel and a battery cell installation support, the battery cell installation support forms M cooling medium circulation paths which are arranged side by side along the left-right direction, the M cooling medium flow paths are all used for mounting a battery cell and providing immersed cooling for the battery cell, and the front and rear ends of the M cooling medium flow paths are respectively communicated with the inlet flow channel and the outlet flow channel; a cooling medium can flow through the inlet flow channel, the M cooling medium flow paths and the outlet flow channel; wherein M is an integer not less than 3. According to the utility model, immersed cooling can be provided for the battery cell, and heat generated by each part of the battery cell can be timely led out, so that the temperature of each part of the battery cell is more uniform, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The utility model relates to a battery pack, in particular to an immersion type battery pack box and a battery pack. Background Art

[0002] As the penetration rate of new energy vehicles gradually increases, customers' anxiety about recharging still exists. At present, various places are gradually deploying charging piles with supercharging functions to combat problems such as inconvenient charging and range anxiety. The supercharging function represents an increase in the battery charging rate, which mainly relies on increasing the battery charging current and charging voltage. Increasing the charging current will generate a lot of heat. If it cannot be discharged from the battery pack in time, the temperature inside the battery pack will rise rapidly. When the maximum working limit temperature of the battery cell is reached, the battery cell will reduce the charging and discharging current and reduce the heat generation. However, this method will shorten the actual supercharging time of the vehicle and increase the recharging time. At the same time, due to the large temperature difference between different parts of the battery cell, the life of the battery cell will also be affected and reduced.

[0003] CN217589094U discloses a serpentine tube assembly, a liquid cooling module and a battery module, wherein the serpentine tube assembly includes a serpentine tube, two liquid accumulation heads and a standard male connector, wherein the serpentine tube is used to contain a coolant; the first liquid accumulation head is connected to one side of the serpentine tube, and the second liquid accumulation head is connected to the other side of the serpentine tube; the standard male connector is arranged on the liquid accumulation head, and the liquid accumulation head can be connected to the outside through the standard male connector. The liquid cooling module includes the above-mentioned serpentine tube assembly, and the battery module includes the above-mentioned liquid cooling module. The serpentine tube assembly, the liquid cooling module and the battery module in this technical solution are convenient for connecting the serpentine tube assembly with the external structure by setting a standard male connector, thereby reducing the difficulty of assembly; and the serpentine tube, the liquid accumulation head and the standard male connector are all structural parts that are processed in batches or purchased from outside, and their own structural precision is relatively high, which ensures the structural precision of the serpentine tube assembly, can ensure the verticality of the cylindrical battery cell, and improves the reliability of the battery module. Undoubtedly, the technical solution disclosed in the above patent document is a beneficial attempt in the relevant technical field. However, in this technical solution, the heat transfer between the serpentine tube and the battery cell is solid-solid, that is, heat exchange is carried out by thermal radiation, which has a low heat exchange efficiency. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide an immersion type battery pack box and a battery pack, which can provide immersion cooling for the battery cells, so that the heat generated by various parts of the battery cells can be promptly discharged, making the temperature of various parts of the battery cells more uniform and improving the battery life.

[0005] An immersion battery pack box body in the present utility model includes a box body base. An inlet flow channel, an outlet flow channel, and a battery cell mounting bracket are arranged on the box body base. The battery cell mounting bracket forms M cooling medium circulation paths arranged side by side in the left - right direction. All M cooling medium circulation paths are used to mount battery cells and provide immersion cooling for the battery cells. The front and rear ends of the M cooling medium circulation paths are respectively communicated with the inlet flow channel and the outlet flow channel; the cooling medium can flow through the inlet flow channel, the M cooling medium circulation paths, and the outlet flow channel; wherein, M is an integer not less than 3.

[0006] Furthermore, N rows of immersion cooling cavity groups are sequentially arranged on the battery cell mounting bracket in the front - rear direction, and each row of the immersion cooling cavity groups includes M immersion cooling cavity bodies arranged side by side in the left - right direction; each of the immersion cooling cavity bodies in the front - most row of the immersion cooling cavity groups is communicated with the inlet flow channel, each of the immersion cooling cavity bodies in the rearmost row of the immersion cooling cavity groups is communicated with the outlet flow channel, and the T - th immersion cooling cavity body in each row of the immersion cooling cavity groups is communicated with the T - th immersion cooling cavity body in the adjacent row of the immersion cooling cavity groups, so that N*M immersion cooling cavity bodies form M cooling medium circulation paths arranged side by side in the left - right direction; wherein, T is any integer value among 1, 2, 3,... M - 1, M, and N is an integer not less than 3.

[0007] Furthermore, adjacent two of the immersion cooling cavity bodies in each row are not communicated with each other, so that the M cooling medium circulation paths are independent of each other.

[0008] Furthermore, the position of the T - th immersion cooling cavity in each row of the immersion cooling cavity groups is offset in the left - right direction from the position of the T - th immersion cooling cavity in the adjacent row of the immersion cooling cavity groups.

[0009] Furthermore, a gap for the cooling medium to pass through can be formed between the inner wall of the cavity of each immersion cooling cavity body and the battery cell.

[0010] Furthermore, a mounting ring for fixing the battery cell is arranged at the lower part of each immersion cooling cavity body, and the mounting ring protrudes radially inwards from the inner wall of the cavity.

[0011] Furthermore, through grooves are formed on the inner wall of the cavity of each immersion cooling cavity body.

[0012] Furthermore, a sealing gasket is arranged at the bottom of each immersion cooling cavity body, and a thermal runaway exhaust hole is arranged on the lower side of the sealing gasket.

[0013] Furthermore, a box body upper cover arranged on the box body base is also included.

[0014] A battery pack in the utility model comprises the above-mentioned immersion type battery pack box body, and also comprises N*M battery cells, and each of the immersion cooling chamber bodies is equipped with one of the battery cells.

[0015] The beneficial effects of the utility model are:

[0016] (1) In the utility model, the cooling medium enters the box body base from the inlet flow channel, and then the cooling medium flows from the inlet flow channel to M cooling medium flow paths respectively, and finally converges at the inlet flow channel and is discharged from the box body base. The cooling medium in the cooling medium flow path can provide immersion cooling for the battery cell, and the heat generated by various parts of the battery cell can be discharged in time, so that the temperature of various parts of the battery cell is more uniform, thereby improving the battery life.

[0017] (2) The cooling medium of the utility model is dispersed from the inlet flow channel to each cooling medium flow path, which can make the cooling medium dispersed more evenly, reduce the existence of dead zones, make the temperature of the cooling medium in different areas more uniform, and ensure that the battery cells in different areas have a higher cooling efficiency.

[0018] (3) The battery cell mounting bracket of the utility model occupies a part of the space between the battery cells, reducing the cooling medium in the immersed battery pack box. The density of the immersed battery pack box is less than the density of the cooling medium, so the weight of the battery pack during use can be reduced.

[0019] (4) The battery cells of the utility model are arranged compactly, and the space utilization rate is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model is described with the following drawings:

[0021] Figure 1 It is a structural schematic diagram of the box base of the utility model;

[0022] Figure 2 It is a schematic diagram of a partial flow path of the cooling medium of the box base of the utility model;

[0023] Figure 3 It is a partial enlarged schematic diagram of a portion of the flow path of the cooling medium of the box base of the utility model;

[0024] Figure 4 It is a partial enlarged schematic diagram of the box base of the utility model;

[0025] Figure 5 It is a partial cross-sectional schematic diagram of the box base of the utility model;

[0026] Figure 6It is a bottom view schematic diagram of the box body base of the utility model;

[0027] Figure 7 It is a schematic structural diagram of the battery pack of the present utility model.

[0028] The following are marked in the accompanying drawings:

[0029] 1-box base, 11-inlet flow channel, 12-outlet flow channel, 13-cell mounting bracket, 131-immersion cooling chamber body, 1311-inner wall of the chamber, 1312-mounting ring, 1313-through groove, 1314-sealing pad, 1315-thermal runaway exhaust hole;

[0030] 2-box cover;

[0031] 3-Battery cells. DETAILED DESCRIPTION

[0032] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings and embodiments.

[0033] like Figures 1-6 As shown, an immersion battery pack box body in this embodiment includes a box body base 1, on which an inlet flow channel 11, an outlet flow channel 12 and a battery cell mounting bracket 13 are arranged, and the battery cell mounting bracket 13 forms M cooling medium flow paths arranged in parallel along the left-right direction, and the M cooling medium flow paths are all used to install the battery cell 3 and provide immersion cooling for the battery cell 3, and the front and rear ends of the M cooling medium flow paths are respectively connected to the inlet flow channel 11 and the outlet flow channel 12; the cooling medium can flow through the inlet flow channel 11, the M cooling medium flow paths and the outlet flow channel 12; wherein M is an integer not less than 3, for example, M can be 10, 25 or 30.

[0034] The cooling medium enters the box body base 1 from the inlet flow channel 11, and then flows from the inlet flow channel 11 to M cooling medium flow paths, and finally converges at the inlet flow channel 11 and is discharged from the box body base 1. The cooling medium in the cooling medium flow path can provide immersion cooling for the battery cell 3, and the heat generated by various parts of the battery cell 3 can be promptly discharged, so that the temperature of various parts of the battery cell 3 is more uniform, and the battery life is improved. In addition, the cooling medium is dispersed from the inlet flow channel 11 to each cooling medium flow path, which can make the cooling medium more evenly dispersed, reduce the existence of dead zones, and make the temperature of the cooling medium in different areas more uniform, ensuring that the battery cells 3 in different areas have a higher cooling efficiency.

[0035] In this embodiment, N rows of immersion cooling cavity groups are sequentially arranged on the battery cell mounting bracket 13 in the front-rear direction, and each row of the immersion cooling cavity groups includes M immersion cooling cavity bodies 131 sequentially arranged in the left-right direction; each of the immersion cooling cavity bodies 131 in the frontmost row of the immersion cooling cavity groups is communicated with the inlet flow channel 11, each of the immersion cooling cavity bodies 131 in the rearmost row of the immersion cooling cavity groups is communicated with the outlet flow channel 12, and the T-th immersion cooling cavity body 131 in each row of the immersion cooling cavity groups is communicated with the T-th immersion cooling cavity body 131 in the adjacent row of the immersion cooling cavity groups, so that N*M immersion cooling cavity bodies 131 form M cooling medium circulation paths arranged side by side in the left-right direction; where T is any integer value among 1, 2, 3,... M-1, M, and N is an integer not less than 3. For example, N can be 8, 12 or 16.

[0036] Specifically, the first immersion cooling cavity bodies 131 in each row of the immersion cooling cavity groups are sequentially communicated from front to back to form a first cooling medium circulation path, the second immersion cooling cavity bodies 131 in each row of the immersion cooling cavity groups are sequentially communicated from front to back to form a second cooling medium circulation path, and so on, until the M-th immersion cooling cavity bodies 131 in each row of the immersion cooling cavity groups are sequentially communicated from front to back to form an M-th cooling medium circulation path. It can also be considered that the immersion cooling cavity bodies 131 are arranged in an N-row and M-column arrangement form, and each column of immersion cooling cavity bodies 131 forms a cooling medium circulation path. However, in this embodiment, the positions of the T-th immersion cooling cavities in each row of the immersion cooling cavity groups are offset in the left-right direction from the positions of the T-th immersion cooling cavities in the adjacent row of the immersion cooling cavity groups. This offset arrangement makes the immersion cooling cavity bodies 131 not in a strict N-row and M-column matrix arrangement form. This offset arrangement can make the arrangement of the battery cells 3 more compact and improve the space utilization rate.

[0037] The material of the immersion battery pack box body can be plastic, and the material of the battery cell mounting bracket 13 can also be plastic. The battery cell mounting bracket 13 occupies a part of the space between the battery cells 3, reducing the cooling medium in the immersion battery pack box body. The density of the immersion battery pack box body is less than the density of the cooling medium, so the weight of the battery pack during use can be reduced.

[0038] In this embodiment, the adjacent two immersion cooling cavity bodies 131 in each row are not communicated with each other, so that the M cooling medium circulation paths are independent of each other.

[0039] In this embodiment, the inner wall 1311 of each of the immersion cooling chamber bodies 131 can form a gap for the cooling medium to pass through with the battery cell 3. The battery cell 3 is cylindrical, and the inner wall 1311 of the immersion cooling chamber body 131 is also cylindrical. After each battery cell 3 is placed in each immersion cooling chamber body 131, there is a gap of 1.5 mm - 2 mm between the outer wall of the battery cell 3 and the inner wall 1311 of the immersion cooling chamber body 131 for the cooling medium to pass through.

[0040] In this embodiment, an installation ring 1312 for fixing the battery cell 3 is provided at the lower part of each of the immersion cooling chamber bodies 131, and the installation ring 1312 protrudes radially inward from the inner wall 1311. The installation ring 1312 can be structural adhesive, which can fix the lower part of the battery cell 3 to prevent the battery cell 3 from shaking.

[0041] In this embodiment, through grooves 1313 are formed in the inner wall 1311 of each of the immersion cooling chamber bodies 131. The through grooves 1313 are used for the cooling medium to pass through, and the size of the through grooves 1313 can be designed according to requirements. The rest of the inner wall 1311 of the immersion cooling chamber body 131 occupies a part of the space between the battery cells 3, reducing the cooling medium in the immersion battery pack box body. The density of the immersion battery pack box body is less than that of the cooling medium, so the weight of the battery pack during use can be reduced.

[0042] In this embodiment, a sealing gasket 1314 is provided at the bottom of each of the immersion cooling chamber bodies 131, and a thermal runaway exhaust hole 1315 is provided on the lower side of the sealing gasket 1314. The sealing gasket 1314 can prevent the cooling medium from being discharged from the thermal runaway exhaust hole 1315. When thermal runaway occurs, a single battery cell 3 has a directional eruption channel, reducing the influence on adjacent battery cells 3.

[0043] As Figure 7 shown, in this embodiment, a box body upper cover 2 provided on the box body base 1 is further included.

[0044] As Figure 7 shown, a battery pack in this embodiment includes the above-mentioned immersion battery pack box body and further includes N*M battery cells 3, and one of the battery cells 3 is installed in each of the immersion cooling chamber bodies 131.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. An immersion battery pack box, characterized in that: The invention comprises a box body base (1), wherein the box body base (1) is provided with an inlet flow channel (11), an outlet flow channel (12) and a battery cell mounting bracket (13), wherein the battery cell mounting bracket (13) forms M cooling medium flow paths arranged in parallel along the left-right direction, wherein the M cooling medium flow paths are all used to install the battery cell (3) and provide immersion cooling for the battery cell (3), and the front and rear ends of the M cooling medium flow paths are respectively connected to the inlet flow channel (11) and the outlet flow channel (12); the cooling medium can flow through the inlet flow channel (11), the M cooling medium flow paths and the outlet flow channel (12); wherein M is an integer not less than 3.

2. The immersed battery pack box according to claim 1, characterized in that: N rows of immersion cooling chamber groups are sequentially arranged on the battery cell mounting bracket (13) along the front-to-back direction, and each row of the immersion cooling chamber groups includes M immersion cooling chamber bodies (131) sequentially arranged along the left-to-right direction; each of the immersion cooling chamber bodies (131) located in the frontmost row of the immersion cooling chamber groups is connected to the inlet flow channel (11), and each of the immersion cooling chamber bodies (131) located in the rearmost row of the immersion cooling chamber groups is connected to the outlet flow channel (12); the Tth immersion cooling chamber body (131) in each row of the immersion cooling chamber groups is connected to the Tth immersion cooling chamber body (131) in the adjacent row of the immersion cooling chamber groups, so that the N*M immersion cooling chamber bodies (131) form M cooling medium flow paths arranged in parallel along the left-to-right direction; wherein T is any integer value among 1, 2, 3, ... M-1, M, and N is an integer not less than 3.

3. The immersed battery pack box according to claim 2, characterized in that: Two adjacent immersion cooling chamber bodies (131) in each row are not connected to each other, so that the M cooling medium flow paths are independent of each other.

4. The immersed battery pack box according to claim 2, characterized in that: The position of the Tth immersion cooling cavity in each row of the immersion cooling cavity groups is staggered in the left-right direction from the position of the Tth immersion cooling cavity in the adjacent row of the immersion cooling cavity groups.

5. The immersed battery pack box according to claim 2, characterized in that: The inner wall (1311) of each of the immersion cooling cavity bodies (131) can form a gap with the battery core (3) for the cooling medium to pass through.

6. The immersed battery pack box according to claim 2, characterized in that: A mounting ring (1312) for fixing the battery core (3) is provided at the lower part of each immersion cooling cavity body (131), and the mounting ring (1312) protrudes radially inward from the cavity inner wall (1311).

7. The immersed battery pack box according to claim 2, characterized in that: The inner wall (1311) of each immersion cooling cavity body (131) is provided with a through groove (1313).

8. The immersed battery pack box according to claim 2, characterized in that: A sealing gasket (1314) is provided at the bottom of each immersion cooling chamber body (131), and a thermal runaway exhaust hole (1315) is provided at the lower side of the sealing gasket (1314).

9. The immersed battery pack box according to any one of claims 2 to 8, characterized in that: It also comprises a box body upper cover (2) arranged on the box body base (1).

10. A battery pack, characterized in that: It comprises the immersed battery pack box body as claimed in claim 9, and further comprises N*M battery cells (3), each of the immersed cooling chamber bodies (131) being provided with one of the battery cells (3).

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