Immersed battery box

Abstract

The utility model discloses an immersed battery box which comprises a box main body and a cover plate, the cover plate is arranged above the box main body, and a battery bin, an electrical bin and a partition plate for separating the battery bin from the electrical bin are arranged in the box main body; a plurality of battery cells and branch flow channels located between every two adjacent battery cells are arranged in the battery bin side by side, a lateral plate is arranged between the battery cells and the box body, a first main flow channel allowing cooling liquid to flow is reserved between the lateral plate and the side wall of the battery bin, and an opening allowing the branch flow channels to communicate with the first main flow channel is formed in the lateral plate; and a second main runner is reserved between the end part of the lateral plate and the partition plate. By arranging the branch flow channels, the partition plate, the lateral plate, the first main flow channel, the second main flow channel and the outlet flow channel, a battery pack cooling liquid flow distribution channel is simple, the temperature consistency of each battery cell is good, and by arranging the second main flow channel, the influence of heat of an electrical bin on the temperature of the adjacent battery cells is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery thermal management, and particularly relates to an immersion-type battery box. Background Art

[0002] At present, electric vehicles have higher and higher requirements for the charging rate. With the increase of the charging rate, most battery packs dissipate heat from the battery through a liquid cooling method. The liquid cooling method is basically carried out by means of a liquid cooling plate. The liquid cooling plate method has poor control over the temperature consistency of different regions of the battery cells, which is not conducive to the service life of the battery cells.

[0003] In the prior art, for an immersion-cooled battery pack, the cooling liquid flow distribution path is complex, and the cooling liquid flow rate is low, resulting in poor temperature consistency of the batteries in the battery pack and poor battery heat dissipation effect. In addition, the heat sources around the battery pack are not considered to have an impact on the temperature of the battery cells.

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

[0005] The utility model provides an immersion-type battery box, which can solve the problems of complex flow distribution path and low cooling liquid flow rate in the prior art.

[0006] The utility model provides an immersion-type battery box, which comprises a box body main body and a cover plate. The cover plate is arranged above the box body main body. A battery compartment, an electrical compartment, and a partition plate for separating the battery compartment and the electrical compartment are arranged in the box body main body;

[0007] A plurality of battery cells are arranged side by side in the battery compartment, and a branch channel is arranged between two adjacent battery cells. A side plate is arranged between the battery cells and the box body main body. A first main channel for the cooling liquid to flow is left between the side plate and the side wall of the battery compartment. An opening for communicating the branch channel with the first main channel is arranged on the side plate. A second main channel communicating with the first main channel is left between the end of the side plate and the partition plate. An outlet channel communicating with the second main channel is arranged between the end wall of the electrical compartment and the box body main body.

[0008] Further, a water inlet nozzle is arranged on the end wall of the box body main body, and a water outlet nozzle is arranged on the end wall of the box body main body far away from the water inlet nozzle. The installation height of the water inlet nozzle is lower than the installation height of the water outlet nozzle.

[0009] Further, the installation position of the water inlet nozzle is at 1 / 4 of the total height of the box body main body, and the installation position of the water outlet nozzle is at 3 / 4 of the total height of the box body main body.

[0010] Further, the end of the side plate away from the electrical compartment is fixedly arranged at the inner end of the box body, and the proportional relationship between the horizontal distance L1 from the end of the water inlet nozzle to the nearest battery cell and the width W1 of the second main flow channel is such that W1 ≤ L1 ≤ 2W1.

[0011] Further, an annular partition is arranged between adjacent battery cells, and a plurality of horizontally arranged horizontal partitions are arranged on a single annular partition, and the plurality of horizontal partitions divide the branch flow channels into a plurality of sub-branch flow channels.

[0012] Further, arc chamfers are arranged at the top and bottom of the annular partition.

[0013] Further, the cross-sectional area at the entrance of the sub-branch flow channel decreases linearly along the flow direction of the coolant, and the cross-sectional area at the exit increases linearly along the flow direction of the coolant.

[0014] Further, a plurality of the battery cells are tied into a whole by a plurality of cable ties, and openings for the coolant to flow through are arranged on the cable ties corresponding to the sub-branch flow channels.

[0015] Further, insulating sheets, foams, epoxy boards and end plates are sequentially arranged on the outer sides of the battery cells located at the left and right ends.

[0016] Further, the height of the side plate is greater than the height of the battery cell, and the height of the side plate is less than the height of the partition plate.

[0017] Compared with the prior art, the battery pack cooling liquid flow distribution path of the present utility model is simple by arranging the branch flow channels, partition plates, side plates, first main flow channels, second main flow channels and outlet flow channels, and the temperature consistency of each battery cell is good. By arranging the second main flow channel, the influence of the heat in the electrical compartment on the temperature of the adjacent battery cells is improved. By arranging the side plate, on the one hand, it prevents the coolant from hitting the side wall of the battery box, causing energy loss, and on the other hand, it ensures that the coolant flowing through the branch flow channels between each battery cell has an approximately the same flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the battery box of the present utility model;

[0019] Figure 2 is a schematic diagram of the structure of the battery box body of the present utility model;

[0020] Figure 3 is a schematic diagram of the overall structure of the battery cell of the present utility model;

[0021] Figure 4 is a schematic diagram of the battery box of the present utility model excluding the cover plate;

[0022] Figure 5This is the top view of the battery box of the present utility model excluding the cover plate;

[0023] Figure 6 This is the structural schematic diagram of the annular partition of the present utility model;

[0024] Figure 7 This is the side view of the annular partition of the present utility model;

[0025] Reference numerals: 1, battery compartment; 11, battery cell; 12, side plate; 121, opening; 13, annular partition; 131, horizontal partition; 14, cable tie; 141, opening; 15, foam; 16, epoxy board; 17, end plate; 18, insulating sheet; 2, electrical compartment; 3, partition plate; 4, cover plate; 51, branch channel; 511, sub-branch channel; 52, first main channel; 53, second main channel; 54, outlet channel; 61, water inlet nozzle; 62, water outlet nozzle; 7, box body main body. Detailed implementation manners

[0026] To further understand the content, features and effects of the present utility model, the following embodiments are given and are described in detail in conjunction with the attached Figures 1 to 7 as follows.

[0027] As Figures 1 to 7 shown, this embodiment provides an immersion type battery box, which includes a box body main body 7, a battery compartment 1 and an electrical compartment 2 are arranged in the box body main body 7, and a partition plate 3 for separating the battery compartment 1 and the electrical compartment 2, and further includes a cover plate 4 for buckling above the box body main body 7, and the box body main body 7 and the cover plate 4 are fixedly connected by a plurality of bolts;

[0028] A plurality of battery cells 11 are arranged side by side in the battery compartment 1 and a branch channel 51 is located between two adjacent battery cells 11. A side plate 12 is arranged between the battery cell 11 and the box body main body 7. The side plate 12 is composed of two upper and lower parts. The bottom end of the side plate 12 is fixedly arranged on the inner bottom surface of the box body main body 7 by welding. A first main channel 52 for the coolant to flow is left between the side plate 12 and the side wall of the battery compartment 1. An opening 121 for connecting the branch channel 51 and the first main channel 52 is arranged on the side plate 12. A second main channel 53 communicating with the first main channel 52 is left between the end of the side plate 12 and the partition plate 3. As Figure 5 shown, the first main channel 52 includes two located at the upper and lower ends of the battery cell 11, and they are connected by the branch channel 51. An outlet channel 54 communicating with the second main channel 53 is arranged between the end wall of the electrical compartment 2 and the box body main body 7.

[0029] The utility model makes the flow distribution path of the battery pack cooling liquid simple and the temperature consistency of each battery cell good by arranging a branch channel, a partition board, a side board, a first main channel, a second main channel and an outlet channel. By arranging the second main channel, the influence of the heat in the electrical compartment on the temperature of the adjacent battery cells is improved. By arranging the side board, on the one hand, it prevents the coolant from hitting the side wall of the battery box, causing energy loss, and on the other hand, it ensures that the coolant flowing through the branch channels between each battery cell has an approximately the same flow rate.

[0030] In this embodiment, as Figure 5 shown, the box body main body 7 is a rectangular box structure with an opening at the upper part. The water inlet nozzle 61 and the water outlet nozzle 62 are arranged on the short side of the box body main body 7. The central connection line of the water inlet nozzle 61 and the water outlet nozzle 62 is basically coincident with the diagonal line of the bottom surface of the box body main body 7. The side board 12 is arranged along the long side of the box body main body 7. The installation height of the water inlet nozzle 61 is lower than the installation height of the water outlet nozzle 62, so that the flow of the coolant is more uniform. The coolant enters the upper first main channel 52 through the water inlet nozzle 61, and then flows along the side board 12. Part of it flows into the lower first main channel 52 through the branch channel 51, and the other part flows through the second main channel 53. The coolant in the lower first main channel 52 and the second main channel 53 converges and then flows into the outlet channel 54, and finally flows out through the water outlet nozzle 62.

[0031] In this embodiment, the installation position of the water inlet nozzle 61 is at 1 / 4 of the total height of the box body main body 7, and the installation position of the water outlet nozzle 62 is at 3 / 4 of the total height of the box body main body 7. Such a setting makes the overall coolant flow effect better. The water inlet nozzle 61 and the box body main body 7 are fixedly connected by welding and glue. Welding ensures the fixing strength of the water inlet nozzle, and glue bonding ensures the sealing performance between the water inlet nozzle 61 and the box body main body 7.

[0032] In this embodiment, as Figure 5 shown, the end of the side board 12 far away from the electrical compartment 2 is fixedly arranged at the inner end of the box body main body 7 by welding. The ratio relationship between the horizontal distance L1 from the inner side wall of the box body main body 7 where the water inlet nozzle 61 is located to the nearest battery cell 11 and the width W1 of the second main channel 53 is that W1 ≤ L1 ≤ 2W1. The upper first main channel 51 is set as long as possible, which can reduce the energy loss caused by the collision when the coolant turns from the first main channel 51 to the second main channel 53 to a certain extent.

[0033] In this embodiment, as Figure 6 and 7As shown in the figure, a ring-shaped partition 13 is provided between two adjacent battery cells 11. A plurality of horizontally arranged horizontal partitions 131 are provided on a single ring-shaped partition 13. The plurality of horizontal partitions 131 divide the branch flow channel 51 into a plurality of sub-branch flow channels 511. The top and bottom of the ring-shaped partition 13 are provided with arc chamfers to reduce stress concentration.

[0034] In this embodiment, the cross-sectional area at the entrance of the sub-branch flow channel 511 decreases linearly along the flow direction of the coolant, and the cross-sectional area at the exit increases linearly along the flow direction of the coolant. This can avoid energy loss caused by a right-angle structure when the coolant flows into and out of the sub-branch flow channel 511.

[0035] In this embodiment, as Figure 3 shown, a plurality of the battery cells 11 are tied into a whole by two upper and lower tie straps 14. Openings 141 for the coolant to flow through are provided on the tie straps 14 corresponding to the sub-branch flow channels 511. This facilitates the flow of the coolant and can enhance the overall heat dissipation effect.

[0036] In this embodiment, as Figure 3 shown, insulating sheets 18, foams 15, epoxy boards 16, and end plates 17 are sequentially arranged on the outer sides of the battery cells 11 at the left and right ends. A space for the cooling liquid to flow from the first main flow channel 52 to the second main flow channel 53 is left between the end of the side plate 12 close to the electrical compartment 2 and the partition plate 3. The end plate 17 is a die-cast aluminum formed part. On the one hand, it is used to protect the battery cell 11 at the end plate; on the other hand, it is used to bear the tightening force of the tie strap 14. The foam 15 can, on the one hand, play a heat preservation role for the adjacent battery cells 11, and on the other hand, it can be used to absorb the horizontal distance dimension deviation of the battery cells 11 due to thickness consistency, avoiding the tie strap 14 being unable to tie the battery cells normally. The epoxy board 16 is mainly used to protect the foam 15, and the insulating sheet 18 is used to prevent insulation failure when the foam 15 is damaged.

[0037] In this embodiment, the height of the side plate 12 is greater than the height of the battery cell 11, and the height of the side plate 12 is less than the height of the partition plate 3, so that the overall immersion effect is better.

[0038] The above-mentioned utility model of the present invention only expresses the implementation manners of the embodiments of the present utility model, and thus cannot be understood as a limitation on the scope of the utility model patent, nor is it a limitation on the structure of the embodiments of the present utility model in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the embodiments of the present utility model, several changes and improvements can still be made, and these all belong to the protection scope of the embodiments of the present utility model.

Claims

1. An immersion battery box, characterized in that: The invention comprises a box body (7) and a cover plate (4), wherein the cover plate (4) is arranged above the box body (7), and a battery compartment (1), an electrical compartment (2), and a partition plate (3) for separating the battery compartment (1) and the electrical compartment (2) are arranged in the box body (7); A plurality of battery cells (11) and a branch channel (51) located between two adjacent battery cells (11) are arranged side by side in the battery compartment (1); a side plate (12) is arranged between the battery cells (11) and the box body (7); a first main channel (52) for the flow of cooling liquid is reserved between the side plate (12) and the side wall of the battery compartment (1); an opening (121) for connecting the branch channel (51) with the first main channel (52) is arranged on the side plate (12); a second main channel (53) connected to the first main channel (52) is reserved between the end of the side plate (12) and the partition plate (3); and an outlet channel (54) connected to the second main channel (53) is arranged between the end wall of the battery compartment (2) and the box body (7).

2. The submerged battery box according to claim 1, characterized in that: A water inlet nozzle (61) is provided on the end wall of the box body (7), and a water outlet nozzle (62) is provided on the end wall of the box body (7) away from the water inlet nozzle (61), and the installation height of the water inlet nozzle (61) is lower than the installation height of the water outlet nozzle (62).

3. The submerged battery box according to claim 2, characterized in that: The installation position of the water inlet nozzle (61) is located at 1 / 4 of the total height of the box body (7), and the installation position of the water outlet nozzle (62) is located at 3 / 4 of the total height of the box body (7).

4. The submerged battery box according to claim 2, characterized in that: The end of the side plate (12) away from the electrical compartment (2) is fixedly arranged at the inner end of the box body (7), and the horizontal distance L1 of the inner wall of the box body (7) where the water inlet nozzle (61) is located from the nearest battery cell (11) and the width W1 of the second main flow channel (53) are proportional to W1≤L1≤2W1.

5. The submerged battery box according to claim 1, characterized in that: An annular partition (13) is provided between two adjacent battery cells (11), a plurality of parallel horizontal partitions (131) are provided in a single annular partition (13), and the plurality of horizontal partitions (131) divide the branch channel (51) into a plurality of sub-branch channels (511).

6. The submerged battery box according to claim 5, characterized in that: The top and bottom of the annular partition (13) are provided with circular arc chamfers.

7. The submerged battery box according to claim 6, characterized in that: The cross-sectional area at the inlet of the sub-branch flow channel (511) decreases linearly along the flow direction of the coolant, and the cross-sectional area at the outlet increases linearly along the flow direction of the coolant.

8. The submerged battery box according to claim 5, characterized in that: The plurality of battery cells (11) are bound together as a whole by a plurality of tie ties (14), and openings (141) for coolant to flow through are provided on the tie ties (14) at locations corresponding to the branch flow channels (511).

9. The submerged battery box according to claim 1, characterized in that: The outer side surfaces of the battery core (11) at the left and right ends are provided with an insulating sheet (18), foam (15), an epoxy plate (16) and an end plate (17) in sequence.

10. The submerged battery box according to claim 1, characterized in that: The height of the lateral plate (12) is greater than the height of the battery core (11), and the height of the lateral plate (12) is less than the height of the partition plate (3).

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