Full-immersion liquid-cooled battery pack

Abstract

The utility model provides a full-immersion liquid-cooled battery pack, and belongs to the field of new energy batteries. The battery pack comprises a box body and battery cells, the box body is of a box-shaped structure with an upward opening, a liquid injection pipe and a liquid discharge pipe are arranged on the box body and arranged on the two opposite side faces of the box body respectively, the battery cells are arranged in the box body, a gap is formed between the box body and the battery cells, and a colloid layer and a cooling liquid layer are arranged in the gap. The colloid layer is located at the bottom of the cooling liquid layer. By adopting the full-immersion liquid-cooled battery pack provided by the embodiment of the utility model, the problem of poor temperature uniformity of the battery cells in the prior art can be solved.

Description

Technical Field

[0001] This utility model relates to the field of new energy batteries, and in particular to a fully immersed liquid-cooled battery pack. Background Technology

[0002] Lithium-ion batteries are increasingly widely used in energy storage. With the introduction of next-generation large batteries, new challenges have arisen for battery thermal management technology. Current plate-swapping thermal management technology can no longer meet the thermal management requirements of large batteries. To address this, the energy storage field has introduced full immersion thermal management technology. This technology can be applied at both the battery module and battery cluster levels. Relatively speaking, application at the battery cluster level offers better overall temperature uniformity and lower application costs. During cell operation, the current from the battery electrodes converges at the tabs, resulting in a higher current density at the tabs. The current density increases progressively from bottom to top of the electrode. This means that during battery use, the temperature is highest at the terminal post at the top of the cell. During a single discharge cycle, the maximum temperature of the terminal post can reach 35°C. The temperature drops below 30°C when the battery is about 5cm below the shoulder height, while the temperature at the bottom of the cell remains relatively stable at 25-26°C.

[0003] In existing technologies, fully immersed liquid-cooled battery packs typically immerse the battery cells completely in coolant. However, due to the inconsistent temperatures of different parts of the battery cell during use, the hotter parts are difficult to cool down sufficiently, resulting in poor temperature uniformity of the battery cells.

[0004] Existing fully immersed liquid-cooled battery packs have poor cooling effects because the cells are completely submerged in coolant, resulting in poor cell temperature uniformity. Utility Model Content

[0005] This utility model provides a fully immersed liquid-cooled battery pack, which can solve the problem of poor cell temperature uniformity in the prior art. The technical solution is as follows:

[0006] A fully submersible liquid-cooled battery pack includes: a housing and battery cells.

[0007] The housing is an upward-opening box-shaped structure. The housing has an injection pipe and a drain pipe, which are respectively located on opposite sides of the housing. The battery cell is located inside the housing. There is a gap between the housing and the battery cell. A colloid layer and a coolant layer are disposed in the gap. The colloid layer is located at the bottom of the coolant layer.

[0008] Optionally, the bottom of the housing is provided with a positioning protrusion, and the bottom of the battery cell matches the positioning protrusion.

[0009] Optionally, multiple battery cells are provided, and the multiple battery cells are arranged in a rectangular array inside the housing.

[0010] Optionally, multiple positioning protrusions are provided, and the multiple positioning protrusions are arranged in a rectangular array inside the housing.

[0011] Optionally, the housing is provided with two end plates, and the plurality of battery cells are clamped between the two end plates.

[0012] Optionally, the end plate is provided with reinforcing ribs.

[0013] Optionally, the maximum height of the colloidal layer is located 0-5 cm below the top of the battery cell.

[0014] Optionally, it also includes a cover plate, which is disposed on the housing, and a sealing ring is provided between the cover plate and the housing.

[0015] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following:

[0016] This utility model provides a fully immersed liquid-cooled battery pack with the battery cells' terminals facing upwards inside the casing. The gap between the casing and the battery cells is divided into a gel layer and a coolant layer. Gel is injected into the gel layer, and coolant is injected into the coolant layer, so that most of the space in the gap is filled with gel. During full immersion liquid cooling, the required volume of coolant is reduced, and the entire coolant inside the casing can be replaced quickly. On the other hand, the temperature inside the battery cell decreases sequentially from top to bottom. Placing the gel layer at the bottom of the coolant layer allows the coolant to directly cool the upper part of the battery cell and quickly absorb heat and cool the middle part of the battery cell. The cooling effect on the upper part of the battery cell is stronger than that on the middle and lower parts, thus minimizing the temperature difference between the upper and lower parts. This effectively solves the problem of poor temperature uniformity of battery cells in the prior art. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an assembly diagram without glue application provided in this embodiment of the utility model;

[0019] Figure 2This is a schematic diagram of the assembly after glue injection provided in this embodiment of the utility model;

[0020] Figure 3 This is a cross-sectional view of the overall structure provided in an embodiment of the present utility model.

[0021] In the diagram: 1-box body; 11-injection pipe; 12-drain pipe; 2-battery cell; 31-colloidal layer; 32-coolant layer; 4-positioning protrusion; 5-end plate; 51-reinforcing rib; 6-cover plate; 7-sealing ring. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0023] Figure 1 This is an assembly diagram without glue application provided in this embodiment of the utility model; Figure 2 This is a schematic diagram of the assembly after glue injection provided in this embodiment of the utility model; Figure 3 This is a cross-sectional view of the overall structure provided in an embodiment of this utility model. (See attached diagram.) Figures 1 to 3 The fully immersed liquid-cooled battery pack shown includes: a housing 1 and a battery cell 2. The housing 1 is a box-shaped structure with an upward opening. An injection pipe 11 and a drain pipe 12 are provided on the housing 1. The injection pipe 11 and the drain pipe 12 are respectively arranged on opposite sides of the housing 1. The battery cell 2 is arranged inside the housing 1. There is a gap between the housing 1 and the battery cell 2. A gel layer 31 and a coolant layer 32 are arranged in the gap. The gel layer 31 is located at the bottom of the coolant layer 32.

[0024] In an exemplary embodiment of this invention, the housing 1 provides external support for the battery cell 2. The battery cell 2 is positioned with its terminals facing upwards inside the housing 1, and a gap exists between the housing 1 and the battery cell 2. A shielding cloth is placed on top of the battery cell 2 to prevent contamination of the terminals during subsequent glue injection. Glue is then injected into the gap. The glue can be made of silicone, epoxy resin, polyurethane, etc. After the glue solidifies, the glue layer 31 can fix the battery cell 2, eliminating the need for additional fixing equipment to secure the battery within the housing. This reduces the use of fixing parts and lowers production costs. After the colloidal layer 31 is formed, coolant can be injected onto the colloidal layer 31. The coolant can be hydrocarbon, fluorinated oil, silicone oil, ester, alcohol, etc. The coolant enters the housing 1 from the injection pipe 11, cools the cell 2, and then flows out from the drain pipe 12. Because the colloidal layer is injected into the housing, the volume of coolant in the housing 1 is reduced, and the coolant is mainly concentrated in the upper part of the cell 2, thereby improving the heat exchange efficiency of the coolant and ensuring the uniformity of the internal temperature of the battery.

[0025] This utility model provides a fully immersed liquid-cooled battery pack. The battery cell 2 is positioned with its terminals facing upwards inside a housing 1. The gap between the housing 1 and the battery cell 2 is divided into a gel layer 31 and a coolant layer 32. Gel is injected into the gel layer 31, and coolant is injected into the coolant layer 32, filling most of the gap with gel. This reduces the required coolant volume during full immersion liquid cooling, allowing for rapid replacement of the coolant within the housing 1. Furthermore, the temperature inside the battery cell 2 decreases sequentially from top to bottom. By placing the gel layer 31 at the bottom of the coolant layer 32, the coolant can directly cool the upper part of the battery cell 2 and rapidly absorb heat from the middle part. The cooling effect on the upper part of the battery cell 2 is stronger than that on the middle and lower parts, thus minimizing the temperature difference between the upper and lower parts. This effectively solves the problem of poor temperature uniformity in the battery cells in existing technologies.

[0026] Optionally, the bottom of the housing 1 is provided with a positioning protrusion 4, and the bottom of the battery cell 2 matches the positioning protrusion 4.

[0027] For example, in this embodiment of the present invention, by providing a positioning protrusion 4 at the bottom of the housing 1 to cooperate with the bottom of the battery cell 2, a certain auxiliary positioning function can be provided when the battery cell 2 is installed in the housing 1, so that the battery cell 2 can be quickly and correctly installed in the designated position, thereby improving the battery assembly efficiency and also improving the structural stability of the battery pack.

[0028] Optionally, multiple battery cells 2 are provided, and the multiple battery cells 2 are arranged in a rectangular array inside the housing 1.

[0029] For example, in this embodiment of the present invention, by providing multiple battery cells 2, the multiple battery cells 2 can be connected in series or in parallel, thereby increasing the total capacity of the battery and thus increasing the maximum storage capacity of the battery pack.

[0030] Optionally, multiple positioning protrusions 4 are provided, and the multiple positioning protrusions 4 are arranged in a rectangular array inside the housing 1.

[0031] For example, in this embodiment of the present invention, multiple positioning protrusions 4 are provided to position each battery cell 2, thereby ensuring that each battery cell 2 is stably placed inside the housing. A groove matching the positioning protrusion 4 can be provided at the bottom of the battery cell 2, and the positioning protrusion 4 and the groove cooperate to position and install each battery cell 2. Since the battery cell is typically square, the positioning protrusion 4 can also be provided at the four corners of the bottom of the battery cell 2 to limit the movement of the four corners. By setting the positioning protrusion 4 in this structure, it is unnecessary to create a groove at the bottom of the battery cell 2, thus improving the ease of assembly of this battery pack.

[0032] Optionally, the housing 1 is provided with two end plates 5, and multiple battery cells 2 are clamped between the two end plates 5.

[0033] For example, in this embodiment of the present invention, the battery cell 2 is clamped and fixed by setting the end plate 5 before the glue is injected into the housing 1. This can provide an auxiliary positioning function for the glue injection process. Compared with the traditional technology, this embodiment eliminates the need for pressing equipment, steel strips, aerogel, etc. to fix the battery cell 2 by setting the end plate 5, thereby reducing the use of fixing parts and further reducing production costs.

[0034] Optionally, the end plate 5 is provided with reinforcing ribs 51.

[0035] For example, in this embodiment of the present invention, by providing reinforcing ribs 51, the structural strength of the end plate 5 can be improved, thereby enabling the end plate 5 to clamp and fix multiple battery cells 2 more stably, and further improving the structural stability of the battery pack.

[0036] Optionally, the maximum height of the colloidal layer 31 is located 0-5 cm below the top of the cell 2.

[0037] For example, in this embodiment of the present invention, during a single discharge, the maximum temperature of the electrode post can reach 35°C, while the temperature drops to below 30°C about 5cm below the top of the cell 2. The temperature at the bottom of the cell 2 can be maintained at almost 25-26°C. Therefore, the maximum height of the gel layer 31 is set at 5cm below the top of the cell 2, so that the injected coolant can directly cool the high-temperature part within 5cm below the top of the cell 2. This can minimize the temperature difference between the upper and lower parts and further improve the uniformity of the internal temperature of the cell 2.

[0038] Optionally, it also includes a cover plate 6, which is placed on the housing 1, and a sealing ring 7 is provided between the cover plate 6 and the housing 1.

[0039] For example, in this embodiment of the present invention, the cover plate 6 is provided to protect the battery cell 2, and a sealing ring is provided between the cover plate 6 and the housing 1 to prevent coolant from flowing out of the housing, thereby improving the sealing performance of the battery pack.

[0040] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0041] The above description is only an optional embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fully immersed liquid-cooled battery pack, characterized in that, include: Box (1), battery cell (2), The housing (1) is a box-shaped structure with an upward opening. The housing (1) is provided with an injection pipe (11) and a drain pipe (12). The injection pipe (11) and the drain pipe (12) are respectively arranged on opposite sides of the housing (1). The battery cell (2) is arranged inside the housing (1). There is a gap between the housing (1) and the battery cell (2). A colloid layer (31) and a coolant layer (32) are arranged in the gap. The colloid layer (31) is located at the bottom of the coolant layer (32).

2. The fully immersed liquid-cooled battery pack according to claim 1, characterized in that, The bottom of the housing (1) is provided with a positioning protrusion (4), and the bottom of the battery cell (2) matches the positioning protrusion (4).

3. The fully immersed liquid-cooled battery pack according to claim 2, characterized in that, Multiple battery cells (2) are provided, and the multiple battery cells (2) are arranged in a rectangular array inside the housing (1).

4. A fully immersed liquid-cooled battery pack according to claim 3, characterized in that, The positioning protrusions (4) are provided in multiple ways, and the multiple positioning protrusions (4) are arranged in a rectangular array inside the housing (1).

5. A fully immersed liquid-cooled battery pack according to claim 3, characterized in that, The housing (1) is provided with two end plates (5), and multiple battery cells (2) are sandwiched between the two end plates (5).

6. A fully immersed liquid-cooled battery pack according to claim 5, characterized in that, The end plate (5) is provided with reinforcing ribs (51).

7. A fully immersed liquid-cooled battery pack according to claim 1, characterized in that, The maximum height of the colloidal layer (31) is located 0-5 cm below the top of the battery cell (2).

8. A fully immersed liquid-cooled battery pack according to claim 1, characterized in that, It also includes a cover plate (6), which is placed on the box body (1), and a sealing ring (7) is provided between the cover plate (6) and the box body (1).

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