Semi-immersed liquid-cooled battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a semi-immersed liquid-cooled battery pack which comprises a box body and a battery module, the box body comprises an upper box body and a lower box body which are connected in a sealed mode, a liquid inlet pipe is arranged on the inner wall of the top of the upper box body and extends in the first direction, one end of the liquid inlet pipe extends out of the box body and is communicated with the liquid inlet port, and the liquid inlet pipe located in the box body is provided with a plurality of spray heads communicated with the liquid inlet pipe in the first direction. And the lower box body is provided with a liquid outlet port communicated with the interior of the box body. The battery module is located in the lower box body of the box body and comprises a plurality of battery cells which are sequentially arranged in the first direction, the battery cells are soaked in a cooling working medium in the lower box body, the liquid level of the cooling working medium is lower than the top surfaces of the battery cells in the second direction, and the second direction is perpendicular to the first direction. The semi-immersed liquid-cooled battery pack is high in heat dissipation efficiency, good in heat dissipation effect and low in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a semi-immersed liquid-cooled battery pack. Background Art

[0002] As the capacity of energy storage batteries increases, the heat generated by a large number of energy storage integrated systems during operation is also increasing, which will affect the life of the battery and the safety of the energy storage system. In recent years, immersion liquid cooling technology has emerged in the industry, which directly contacts the battery with an insulating cooling medium (cooling oil, coolant, etc.), and uses a circulation system and a refrigeration system to dissipate heat, achieving fast and efficient heat dissipation.

[0003] The fully submerged liquid-cooled battery pack adopts a direct contact method, which can achieve efficient temperature control. However, the immersion coolant fills the entire battery pack, so that the temperature sensor installed on the battery is immersed in the coolant, which interferes with the collection of the actual temperature of the battery and affects the effective operation of the BMS (battery management system). In addition, the fully submerged liquid-cooled battery pack is expensive, has a high risk of leakage, and commercial operations are difficult to promote. The semi-submerged liquid-cooled battery pack only uses half the amount of coolant and the immersion coolant only fills the lower half of the battery pack, which has low cost and high safety performance. However, compared with the fully submerged liquid-cooled battery pack, the semi-submerged liquid-cooled battery pack has only the lower half of the battery in the coolant. Although the coolant absorbs heat and boils to produce a large amount of vaporized liquid that can be sprinkled on the upper half of the battery, the heat dissipation efficiency is still relatively low.

[0004] Therefore, there is an urgent need to propose a semi-submerged liquid-cooled battery pack to solve the above problems. Utility Model Content

[0005] The utility model provides a semi-immersed liquid-cooled battery pack with high heat dissipation efficiency, good heat dissipation effect and low cost.

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

[0007] Semi-submerged liquid-cooled battery pack, including:

[0008] A box body, the box body comprises an upper box body and a lower box body which are sealed and connected, a top inner wall of the upper box body is provided with a liquid inlet pipe, the liquid inlet pipe extends along a first direction, one end of which extends outside the box body and is connected to a liquid inlet port, the liquid inlet pipe located in the box body is provided with a plurality of nozzles connected to the liquid inlet pipe along the first direction, and the lower box body is provided with a liquid outlet port connected to the inside of the box body;

[0009] A battery module, wherein the battery module is located in the lower box body of the box body and comprises a plurality of battery cells arranged in sequence along the first direction, wherein the battery cells are immersed in a cooling medium in the lower box body, and a liquid level of the cooling medium is lower than a top surface of the battery cells along a second direction, and the second direction is perpendicular to the first direction.

[0010] As an optional technical solution for a semi-immersed liquid-cooled battery pack, a plurality of the nozzles are evenly spaced and distributed along the first direction.

[0011] As an optional technical solution for a semi-immersed liquid-cooled battery pack, the nozzle is located in the center of the battery module along the third direction.

[0012] As an optional technical solution for a semi-submerged liquid-cooled battery pack, the liquid level of the cooling medium is lower than the top surface of the lower box along the second direction.

[0013] As an optional technical solution for a semi-submerged liquid-cooled battery pack, the lower box includes a bottom plate and a frame arranged on the bottom plate, the size of the bottom plate along the first direction is larger than the size of the frame along the first direction, and the size of the bottom plate along the third direction is larger than the size of the frame along the third direction.

[0014] As an optional technical solution for a semi-submerged liquid-cooled battery pack, the liquid outlet port is located on the side wall of the frame close to the bottom plate.

[0015] As an optional technical solution for a semi-submerged liquid-cooled battery pack, a wiring harness interface is provided outside the frame on the bottom plate along the first direction.

[0016] As an optional technical solution for a semi-submerged liquid-cooled battery pack, the upper box body includes a cover plate and a surrounding edge, and the surrounding edge is arranged around the cover plate and extends to the second direction.

[0017] As an optional technical solution for a semi-submerged liquid-cooled battery pack, the liquid inlet pipe includes a main pipe and a bent pipe located at one end of the main pipe, and the bent pipe extends outside the surrounding edge and is connected to the liquid inlet port.

[0018] As an optional technical solution for a semi-submerged liquid-cooled battery pack, the semi-submerged liquid-cooled battery pack further includes a steel belt, which is bound to the periphery of the battery module.

[0019] Beneficial effects of the utility model: The semi-immersed liquid-cooled battery pack provided in this embodiment includes a box body and a battery module, and the box body includes an upper box body and a lower box body that are sealed and connected. The battery module includes a plurality of battery cells and is located in the lower box body of the box body. The battery cells are immersed in the cooling medium in the lower box body, and are in full contact with the cooling medium, absorbing the heat generated by the battery cells, and having high heat dissipation efficiency; at the same time, the cooling medium absorbs heat and boils to produce a large amount of vaporized liquid that can be sprinkled on the upper part of the battery, further improving the heat dissipation efficiency. The liquid level of the cooling medium is lower than the top surface of the battery cell, which does not affect the collection of the actual temperature of the battery, improves the safety performance of the battery, and reduces the use of the cooling medium at a low cost.

[0020] The top inner wall of the upper box of the box body is provided with a liquid inlet pipe, which is connected to the liquid inlet port. The liquid inlet pipe located in the box body is provided with a nozzle. The cooling medium can enter the liquid inlet pipe from the external liquid inlet port and be sprayed on the top of the battery through the nozzle, continuously dissipating heat to the battery part located in the upper box body, increasing the heat dissipation efficiency and making the heat dissipation of various parts of the battery balanced. The lower box body of the box body is provided with a liquid outlet port connected to the inside of the box body, and the cooling medium flows out through the liquid outlet port, so that the liquid level of the cooling medium remains constant, and it is also convenient to replace the cold liquid medium. At the same time, the heat dissipation of the battery is achieved by the flowing cooling medium, which has higher heat dissipation efficiency and better heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0022] Figure 1 It is a schematic diagram of the internal structure of a semi-submerged liquid-cooled battery pack provided by an embodiment of the utility model;

[0023] Figure 2 It is a schematic diagram of the external structure of a semi-submerged liquid-cooled battery pack provided in an embodiment of the utility model.

[0024] In the figure: 100, box body; 110, upper box body; 111, cover plate; 112, surrounding edge; 120, lower box body; 121, bottom plate; 122, frame body; 200, liquid inlet pipe; 210, main pipe; 220, elbow; 300, liquid inlet port; 400, nozzle; 500, liquid outlet port; 600, battery module; 610, steel belt; 700, wiring harness interface. 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", "left", "right" and other directions or positional relationships are based on the directions or positional relationships 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] This embodiment provides a semi-submerged liquid-cooled battery pack with high heat dissipation efficiency, good heat dissipation effect and low cost.

[0030] Specific as Figure 1 and Figure 2As shown, the semi-immersed liquid-cooled battery pack includes a box 100 and a battery module 600. The box 100 includes an upper box 110 and a lower box 120 that are sealed and connected. The top inner wall of the upper box 110 is provided with a liquid inlet pipe 200, which extends along a first direction (i.e., the length direction of the upper box 110 or the lower box 120), one end of which extends to the outside of the box 100 and is connected to the liquid inlet port 300. The liquid inlet pipe 200 located in the box 100 is provided with a plurality of nozzles 400 connected to the liquid inlet pipe 200 along the first direction. The cooling medium can enter the liquid inlet pipe 200 from the external liquid inlet port 300, and be sprayed on the top of the battery through the nozzle 400, continuously dissipating heat to the battery part located in the upper box 110, and increasing the heat dissipation efficiency. The lower box 120 is provided with a liquid outlet port 500 connected to the inside of the box 100. The battery module 600 is located in the lower box 120 of the box 100 and includes a plurality of battery cells arranged in sequence along the first direction. The battery cells are immersed in the cooling medium in the lower box 120 and are in full contact with the cooling medium to absorb the heat generated by the battery cells, so that the heat dissipation efficiency is high. At the same time, the cooling medium absorbs heat and boils to produce a large amount of vaporized liquid that can be sprinkled on the upper half of the battery, further improving the heat dissipation efficiency. The liquid level of the cooling medium is lower than the top surface of the battery cell along the second direction (i.e., the height direction of the upper box 110, the lower box 120 or the battery module 600), and the second direction is perpendicular to the first direction, so that the actual temperature of the battery is not affected, the safety performance of the battery is improved, and the use of the cooling medium is reduced at a low cost. In addition, the cooling medium flows out through the liquid outlet port 500, so that the liquid level of the cooling medium is kept constant, which is also convenient for the replacement of the cold liquid medium. At the same time, the heat dissipation of the battery is realized by the flowing cooling medium, and the heat dissipation efficiency is higher and the heat dissipation effect is better. The upper and lower parts of the battery module 600 both dissipate heat through the flowing cooling medium so that the heat dissipation of each part of the battery is balanced.

[0031] Furthermore, the plurality of nozzles 400 are evenly spaced along the first direction, so that each battery cell in the battery module 600 receives a consistent amount of spraying from the nozzle 400, thereby achieving consistent heat dissipation for each battery cell.

[0032] To further increase the uniformity of heat dissipation of the battery cell, the nozzle 400 is located in the center of the battery module 600 along the third direction (ie, the width direction of the battery module).

[0033] The liquid level of the cooling medium is lower than the top surface of the lower box body 120 along the second direction, thereby reducing the risk of leakage of the cooling medium from the connection between the upper box body 110 and the lower box body 120 .

[0034] Continue to see Figure 1 and Figure 2The lower box 120 includes a bottom plate 121 and a frame 122 disposed on the bottom plate 121. The size of the bottom plate 121 along the first direction is larger than the size of the frame 122 along the first direction, and the size of the bottom plate 121 along the third direction is larger than the size of the frame 122 along the third direction, that is, margins are left around the bottom plate 121 to facilitate the installation of other components on the bottom plate 121 and the connection and installation of the bottom plate 121 with other devices. For example, along the first direction, a wiring harness interface 700 is provided outside the frame 122 on the bottom plate 121. In this embodiment, two wiring harness interfaces 700 are provided.

[0035] To facilitate the outflow of the cooling medium, the liquid outlet port 500 is located on the side wall of the frame 122 near the bottom plate 121. In this embodiment, the liquid outlet port 500 is located between the two wiring harness interfaces 700.

[0036] The upper box body 110 includes a cover plate 111 and a surrounding edge 112. The surrounding edge 112 is arranged around the cover plate 111 and extends in the second direction to increase the connection strength with the lower box body 120 and has a simple structure.

[0037] To facilitate the connection between the liquid inlet pipe 200 and the liquid inlet port 300 , the liquid inlet pipe 200 includes a main pipe 210 and a curved pipe 220 at one end of the main pipe 210 . The curved pipe 220 extends outside the surrounding edge 112 and is connected to the liquid inlet port 300 .

[0038] Continue as Figure 1 As shown, the semi-submerged liquid-cooled battery pack further includes a steel belt 610, which is bound to the periphery of the battery module 600 to increase the stability of the battery module 600, thereby increasing the stability of the semi-submerged liquid-cooled battery pack.

[0039] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. 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 scope of protection of the claims of the present invention.

Claims

1. Semi-immersed liquid-cooled battery pack, characterized in that: include: A box (100), the box (100) comprising an upper box (110) and a lower box (120) which are sealed and connected, a liquid inlet pipe (200) being provided on the top inner wall of the upper box (110), the liquid inlet pipe (200) extending along a first direction, one end of which extends to the outside of the box (100) and is in communication with a liquid inlet port (300), the liquid inlet pipe (200) located in the box (100) being provided with a plurality of nozzles (400) in communication with the liquid inlet pipe (200) along the first direction, and the lower box (120) being provided with a liquid outlet port (500) in communication with the interior of the box (100); A battery module (600), the battery module (600) being located in the lower box (120) of the box (100), and comprising a plurality of battery cells arranged in sequence along the first direction, the battery cells being immersed in a cooling medium in the lower box (120), and the liquid level of the cooling medium being lower than the top surface of the battery cells along a second direction, the second direction being perpendicular to the first direction.

2. The semi-submerged liquid-cooled battery pack according to claim 1, characterized in that: The plurality of nozzles (400) are evenly distributed along the first direction.

3. The semi-submerged liquid-cooled battery pack according to claim 2, characterized in that: The nozzle (400) is located at the center of the battery module (600) along the third direction.

4. The semi-submerged liquid-cooled battery pack according to claim 1, characterized in that: The liquid level of the cooling medium is lower than the top surface of the lower box (120) along the second direction.

5. The semi-submerged liquid-cooled battery pack according to claim 1, characterized in that: The lower box body (120) comprises a bottom plate (121) and a frame body (122) arranged on the bottom plate (121); the size of the bottom plate (121) along the first direction is larger than the size of the frame body (122) along the first direction, and the size of the bottom plate (121) along the third direction is larger than the size of the frame body (122) along the third direction.

6. The semi-submerged liquid-cooled battery pack according to claim 5, characterized in that: The liquid outlet port (500) is located on the side wall of the frame (122) close to the bottom plate (121).

7. The semi-submerged liquid-cooled battery pack according to claim 5, characterized in that: Along the first direction, a wiring harness interface (700) is provided outside the frame (122) on the bottom plate (121).

8. The semi-submerged liquid-cooled battery pack according to claim 1, characterized in that: The upper box body (110) comprises a cover plate (111) and a surrounding edge (112), wherein the surrounding edge (112) is arranged around the cover plate (111) and extends toward the second direction.

9. The semi-submerged liquid-cooled battery pack according to claim 8, characterized in that: The liquid inlet pipe (200) comprises a main pipe (210) and a bent pipe (220) located at one end of the main pipe (210); the bent pipe (220) extends outside the surrounding edge (112) and is connected to the liquid inlet port (300).

10. The semi-submerged liquid-cooled battery pack according to claim 1, characterized in that: The semi-submerged liquid-cooled battery pack further comprises a steel belt (610), wherein the steel belt (610) is bound to the outer periphery of the battery module (600).

Images