Immersed battery box structure

Abstract

The utility model belongs to the technical field of battery box structure, and discloses an immersed battery box structure, including a battery module, a battery box body and an insulating coolant. The battery module includes a tab, a battery cell and an aluminum bar, and the aluminum bar and the tab are connected to the same surface of the battery cell. The battery box body forms a storage space, and the battery box body includes a liquid-cooled bottom plate and a side plate. The liquid-cooled bottom plate is sealed and connected to the bottom of the side plate. The insulating coolant is located in the storage space, and the battery module is immersed in the insulating coolant, so that all parts of the battery module surface can directly contact the insulating coolant for heat dissipation. The insulating coolant transfers heat to the outside through the battery box body, so that the heat dissipation of all parts of the battery module is uniform. The battery module is provided with a side of the tab and the aluminum bar facing the liquid-cooled bottom plate, reducing the distance between the tab and the aluminum bar and the liquid-cooled bottom plate, and the heat generated by the tab and the aluminum bar can be transferred to the liquid-cooled bottom plate more quickly, accelerating the heat dissipation speed of the tab and other electrical connectors, and improving the cooling efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of battery structures, in particular to an immersion type battery box structure. Background Art

[0002] Lithium-ion batteries have been widely used due to their high specific energy, long cycle life, low self-discharge, and no memory effect. When the battery module is working, a violent chemical reaction occurs inside it to provide electrical energy. During the charging and discharging process, a large amount of heat is generated, causing the battery module temperature to rise. The temperature of the battery module directly affects its safety, charge and discharge capacity, cycle life and other performance. In order to ensure that the battery structure can work at the optimal operating temperature, the battery structure needs to be cooled.

[0003] At present, the market mainly uses air cooling or liquid cooling for the heat dissipation of battery structures. Air cooling measures use cooling fans to make air flow inside the battery structure and bring the heat of the battery module to the outside. Its structure is simple, easy to install, and low in cost, but the temperature difference between single cells is large and the heat dissipation of the cells is uneven. Liquid cooling measures usually place liquid cooling side plates at the bottom of the cell, and the coolant circulates in the plate for heat exchange. When the battery structure is charged at a high rate, the temperature rise of the electrical connection components such as the tabs and aluminum bars of the cell is relatively high. The liquid cooling side plates start to cool down from the bottom of the cell. The bottom liquid cooling cannot cool the highest temperature part in time, resulting in a slow cooling effect.

[0004] Therefore, there is an urgent need for an immersed battery box structure to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide an immersed battery box structure, which can evenly dissipate heat to the battery module and accelerate the heat dissipation of the parts with higher temperature, thereby ensuring the heat dissipation efficiency of the battery structure.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Provided is an immersed battery box structure, comprising:

[0008] A battery module, the battery module comprising a tab, a battery cell and an aluminum bar, wherein the aluminum bar and the tab are connected to the same surface of the battery cell;

[0009] A battery box, wherein the battery box forms a storage space capable of storing the battery module, the battery box comprises a liquid-cooling bottom plate and a side plate, the liquid-cooling bottom plate is sealed and connected to the bottom of the side plate, and the battery module is provided with the pole ear and the aluminum bar on a side facing the liquid-cooling bottom plate;

[0010] Insulating coolant, the insulating coolant is located in the accommodating space, and the battery module is immersed in the insulating coolant.

[0011] As an optional solution for the submerged battery box structure, the battery module includes a plurality of the battery cells and a plurality of the aluminum bars. The plurality of the battery cells are arranged in parallel, and the aluminum bar is used to connect two adjacent battery cells.

[0012] As an optional solution of the submerged battery box structure, the submerged battery box structure further includes a heat dissipation unit, the heat dissipation unit includes a liquid-cooled side plate, and the liquid-cooled side plate abuts against the side wall of the battery module.

[0013] As an optional solution for the immersed battery box structure, two liquid-cooled side plates are provided, and the two liquid-cooled side plates are respectively abutted against two sides of the battery module.

[0014] As an optional solution for the immersed battery box structure, the heat dissipation unit further includes a heat dissipation pipeline, and the heat dissipation pipeline can pass a second coolant from the outside of the battery box into the liquid-cooled side plate.

[0015] As an optional solution for the submerged battery box structure, the battery module further includes an end plate and a strapping tape, wherein two end plates are provided, the battery cell is located between the two end plates, and the strapping tape is used to bundle the battery cell and the two end plates.

[0016] As an optional solution for the submerged battery box structure, the battery box body further includes a box cover, and the box cover is sealed and connected above the side plate.

[0017] Beneficial effects of the utility model:

[0018] The utility model provides an immersed battery box structure, which immerses the entire battery module in an insulating coolant, so that all parts of the battery module surface can directly contact the insulating coolant for heat dissipation, and the insulating coolant transfers heat to the outside through the battery box, thereby realizing rapid heat dissipation of the battery module. The battery module is provided with the side of the pole ear and the aluminum bar facing the liquid cooling bottom plate, and the distance between the pole ear and the aluminum bar and the liquid cooling bottom plate is reduced. When the battery structure is charged and discharged at a high rate, the temperature rise of the electrical connection parts such as the pole ear and the aluminum bar of the battery cell is relatively high, and the heat absorbed by the insulating coolant near it can be transferred to the liquid cooling bottom plate more quickly, thereby accelerating the heat dissipation speed of the electrical connection parts such as the pole ear and the aluminum bar, and improving the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an internal schematic diagram of the submerged battery box structure provided by the utility model;

[0020] Figure 2It is a structural schematic diagram of a battery module of an immersed battery box structure provided by the utility model.

[0021] In the figure:

[0022] 1. Battery module; 11. Battery cell; 12. Aluminum bar; 13. End plate; 14. Strapping belt;

[0023] 2. Battery box; 21. Accommodation space; 22. Liquid cooling bottom plate; 221. First liquid inlet; 222. First liquid outlet; 23. Side plate;

[0024] 3. Heat dissipation unit; 31. Liquid cooling side panel; 32. Heat dissipation pipeline. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0026] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0029] like Figure 1 As shown, the submerged battery box structure of this embodiment includes a battery module 1, a battery box body 2 and an insulating coolant. The battery module 1 can be provided in multiple, for example, two, three, etc. The battery module 1 includes a battery module 1 including a tab, a battery cell 11 and an aluminum bar 12, and the aluminum bar 12 and the tab are connected to the same surface of the battery cell 11. The battery box body 2 forms a receiving space 21 capable of accommodating the battery cell module 1, and the battery box body 2 includes a liquid-cooled bottom plate 22 and a side plate 23. The liquid-cooled bottom plate 22 is sealed and connected to the bottom of the side plate 23, and the side of the battery module 1 on which the tab and the aluminum bar 12 are provided faces the liquid-cooled bottom plate 22. The insulating coolant is located in the receiving space 21, and the battery module 1 is immersed in the insulating coolant.

[0030] Based on the above design, the immersed battery box structure immerses the entire battery module 1 in the insulating coolant, so that all parts of the battery module 1 surface can be in direct contact with the insulating coolant for heat dissipation, and the insulating coolant transfers heat to the outside through the battery box 2, thereby realizing rapid heat dissipation of the battery module 1. The battery module 1 is provided with one side of the pole ear and the aluminum bar 12 facing the liquid cooling bottom plate 22, and the distance between the pole ear and the aluminum bar 12 and the liquid cooling bottom plate 22 is reduced. When the battery module 1 is charged and discharged at a high rate, the temperature rise of the electrical connection parts such as the pole ear and the aluminum bar 12 of the battery cell 11 is relatively high, and the heat absorbed by the insulating coolant near the pole ear and the aluminum bar 12 can be transferred to the liquid cooling bottom plate 22 more quickly, thereby accelerating the heat dissipation speed of the electrical connection parts such as the pole ear and the aluminum bar 12, and improving the cooling efficiency.

[0031] Specifically, the battery module 1 includes a plurality of battery cells 11 and a plurality of aluminum bars 12 . The plurality of battery cells 11 are arranged in parallel, and the aluminum bars 12 are used to connect two adjacent battery cells 11 .

[0032] Of course, the battery box 2 also includes a box cover (not shown in the figure), which is sealed and connected to the top of the side plate 23 to prevent pollutants from entering the battery box 2 and to prevent the insulating coolant from overflowing from the battery box 2. The box cover, the side plate 23 and the liquid cooling bottom plate 22 constitute a battery box 2 with good sealing performance, which meets the requirements of air tightness and anti-leakage, has little environmental pollution, and makes the immersed battery box structure suitable for harsh use environments. Preferably, the battery box 2 also includes a mounting seat to facilitate the installation of the immersed battery box structure.

[0033] Furthermore, the liquid-cooled base plate 22 is provided with a first liquid inlet 221, a first liquid outlet 222 and a base plate channel. The first liquid inlet 211 is connected to the base plate channel and the first liquid outlet 222 in sequence. The first coolant can flow into the base plate channel from the first liquid inlet 221 and then flow out from the first liquid outlet 222, thereby realizing heat exchange of the liquid-cooled base plate 22.

[0034] Furthermore, the submerged battery box structure also includes a heat dissipation unit 3, which includes a liquid-cooled side plate 31, which is in contact with the side wall of the battery module 1. The liquid-cooled side plate 31 can dissipate heat for the battery module 1 and the insulating coolant, thereby increasing the speed of heat transfer inside the submerged battery box structure and further increasing the efficiency of heat dissipation. Preferably, two liquid-cooled side plates 31 are provided, and the two liquid-cooled side plates 31 are respectively in contact with the two sides of the battery module 1, thereby increasing the heat dissipation efficiency of the battery module 1 and the insulating coolant.

[0035] Optionally, the heat dissipation unit 3 further includes a liquid cooling pipeline 32, and the heat dissipation pipeline 32 can pass a second coolant from the outside of the battery box 2 into the liquid cooling side plate 31. Specifically, a side plate flow channel is provided inside the liquid cooling side plate 31, and a second liquid inlet and a second liquid outlet are provided in the liquid cooling pipeline 32, and the second liquid inlet and the second liquid outlet extend out of the side plate 23. The second coolant flows into the side plate flow channel through the second liquid inlet, and flows out from the second liquid outlet after fully flowing in the liquid cooling side plate 31. The heat absorbed by the liquid cooling side plate 31 can be transferred to the second coolant, and the heat transfer on the liquid cooling side plate 31 is realized by the flow of the second coolant inside and outside the battery box 2, thereby further improving the heat dissipation efficiency of the battery module 1.

[0036] Furthermore, the battery module 1 also includes an end plate 13 and a strapping tape 14. Two end plates 13 are provided, and the battery cell 11 is sandwiched between the two end plates 13. The strapping tape 14 is used to bundle the battery cell 11 and the two end plates 13. The end plates 13 play a protective role for the battery cell 11. The strapping tape 14 is used to tightly bind the battery cell 11 and the two end plates, so that the structure of the battery module 1 is more compact.

[0037] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. An immersion battery box structure, characterized in that: include: A battery module (1), the battery module (1) comprising a tab, a battery cell (11) and an aluminum bar (12), the aluminum bar (12) and the tab being connected to the same surface of the battery cell (11); A battery box (2), the battery box (2) forming a storage space (21) capable of storing the battery module (1), the battery box (2) comprising a liquid cooling bottom plate (22) and a side plate (23), the liquid cooling bottom plate (22) being sealed and connected to the bottom of the side plate (23), and the battery module (1) having the tab and the aluminum bar (12) disposed on one side thereof facing the liquid cooling bottom plate (22); Insulating coolant, the insulating coolant is located in the accommodating space (21), and the battery module (1) is immersed in the insulating coolant.

2. The submerged battery box structure according to claim 1, characterized in that: The battery module (1) comprises a plurality of battery cells (11) and a plurality of aluminum bars (12); the plurality of battery cells (11) are arranged in parallel, and the aluminum bars (12) are used to connect two adjacent battery cells (11).

3. The submerged battery box structure according to claim 1, characterized in that: The submerged battery box structure further comprises a heat dissipation unit (3), wherein the heat dissipation unit (3) comprises a liquid cooling side plate (31), and the liquid cooling side plate (31) abuts against a side wall of the battery module (1).

4. The submerged battery box structure according to claim 3, characterized in that: Two liquid-cooling side plates (31) are provided, and the two liquid-cooling side plates (31) are respectively abutted against two sides of the battery module (1).

5. The submerged battery box structure according to claim 3, characterized in that: The heat dissipation unit (3) further comprises a heat dissipation pipeline (32), and the heat dissipation pipeline (32) is capable of passing a second cooling liquid from the outside of the battery box (2) into the liquid-cooling side plate (31).

6. The submerged battery box structure according to claim 1, characterized in that: The battery module (1) further comprises an end plate (13) and a binding belt (14); two end plates (13) are provided, the battery cell (11) is sandwiched between the two end plates (13), and the binding belt (14) is used to bind the battery cell (11) and the two end plates (13).

7. The submerged battery box structure according to claim 1, characterized in that: The battery box (2) also includes a box cover, which is sealed and connected to the top of the side plate (23).

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