Battery module heat exchange device

Abstract

The invention provides a battery module heat exchange device, which comprises a box body, a liquid inlet assembly and a liquid outlet pipe, the box body is provided with a battery jar formed by a plurality of partition plates, a battery module is placed in the battery jar, the upper part of the side edge of the box body is connected with the liquid inlet assembly, the partition plates are provided with a plurality of uniformly distributed jet holes, and the liquid outlet pipe is connected with the liquid inlet assembly. The injection hole is communicated with the liquid inlet assembly and the battery jar, the liquid outlet pipe is mounted at the bottom of the box body, and the liquid outlet pipe is communicated with the bottom of the battery jar; fluorination liquid reaches the spraying holes through the liquid inlet assembly, is sprayed through the spraying holes to impact the side face of the battery module, then flows downwards and is discharged through the liquid outlet pipe. The battery module heat exchange device is better in heat exchange effect, beneficial to improving temperature uniformity and higher in use safety.

Description

Technical Field

[0001] The present invention relates to the technical field related to the thermal management of lithium batteries, and more precisely, to a heat exchange device for a battery module. Background Art

[0002] The electrochemical energy storage system based on lithium-ion batteries is an important part of the power system, especially an important node for the effective grid connection of renewable energy and distributed power generation. Lithium-ion batteries have the advantages of long cycle life, high charge and discharge efficiency, strong adaptability, fast response speed, short construction period, and flexible geographical space configuration. In addition to the energy storage field, they are also widely used in the power field and other fields. It should be noted that lithium-ion batteries use organic electrolytes with low boiling points and high flammability. Affected by factors such as their electrochemical system, manufacturing process, and usage scenarios, lithium-ion batteries have the risk of thermal runaway. If no effective countermeasures are set, it is extremely easy to cause the thermal runaway spread of battery modules and systems, and then lead to serious accidents such as fires and explosions. It can be seen that effectively controlling the temperature of lithium-ion batteries is crucial for ensuring their safe and stable use, and a heat dissipation solution for lithium-ion batteries needs to be designed.

[0003] The existing heat dissipation solutions for lithium-ion batteries are mainly divided into two types: air cooling and liquid cooling. Air cooling generally has the disadvantages that the battery temperature on the inlet side is low and the battery temperature on the outlet side is high, and it is greatly affected by the external environmental temperature. The heat dissipation of lithium-ion batteries is not uniform enough, and the heat dissipation effect is not ideal; compared with air cooling, in liquid cooling, since the thermal conductivity of the fluorinated liquid is greater than that of air, the heat dissipation uniformity and heat dissipation efficiency are both higher. In the existing liquid cooling solutions, generally, the lithium-ion battery module is directly immersed in the fluorinated liquid, and the convective heat transfer between the coolant and the lithium-ion battery module is realized through the circulation of the coolant. The existing liquid cooling solutions use a large amount of coolant, so generally, coolants with lower costs such as mineral oil are used, and the heat dissipation effect is not ideal; the heat exchange efficiency of the existing liquid cooling solutions is not ideal enough, and there is still room for improvement in the heat dissipation effect.

[0004] In summary, in this field, it is necessary to improve the existing heat exchange device for lithium-ion battery modules, reduce the amount of coolant used, strengthen heat exchange at the same time, improve temperature uniformity, and ensure heat dissipation performance. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a heat exchange device for a battery module, which uses the method of liquid flow impacting the battery module for heat exchange, reduces the amount of fluorinated liquid used while improving the temperature reduction uniformity of the battery module, and improves the use safety of the battery module.

[0006] To achieve the above object, the present invention provides a heat exchange device for a battery module, including a box body, a liquid inlet assembly and a liquid outlet pipe. The box body has battery slots formed by separating with a plurality of partition plates. A battery module is placed inside the battery slot. The upper part of the side of the box body is connected with the liquid inlet assembly, and the partition plate has a plurality of evenly distributed injection holes, and the injection holes communicate the liquid inlet assembly and the battery slot. The liquid outlet pipe is installed at the bottom of the box body, and the liquid outlet pipe communicates with the bottom of the battery slot; the fluorinated liquid reaches the injection holes through the liquid inlet assembly, jets and impacts the side surface of the battery module through the injection holes, and then the fluorinated liquid flows downward and is discharged through the liquid outlet pipe.

[0007] Preferably, the liquid inlet assembly includes a plurality of liquid inlet pipes and a surrounding chamber arranged around the side of the box body. The liquid inlet pipe is connected with the surrounding chamber, and the surrounding chamber communicates with the injection holes.

[0008] Preferably, the inside of the partition plate has a liquid storage cavity. The injection holes and the surrounding chamber are both communicated with the liquid storage cavity, and the liquid storage cavities of adjacent partition plates communicate with each other.

[0009] Preferably, the position where the partition plate is docked with the surrounding chamber has a plurality of evenly arranged liquid inlet holes.

[0010] Preferably, the injection hole 1 adopts a tapered structure.

[0011] Preferably, the bottom of the battery slot has a drainage hole communicated with the liquid outlet pipe.

[0012] Preferably, the drainage hole is located at the center position of the bottom of the battery slot.

[0013] Preferably, the bottom surface of the battery slot is conical, and the drainage hole is located at the lowest position of the bottom surface of the battery slot.

[0014] Preferably, a plurality of support bars for supporting the battery module are arranged at the bottom of the battery slot.

[0015] Preferably, the battery slot is enclosed, and the internal pressure of the battery slot is slightly positive pressure.

[0016] Compared with the prior art, the advantages of a battery module heat exchange device disclosed by the present invention are as follows: The battery module heat exchange device reduces heat exchange by means of jet impinging on the battery module, with better heat exchange effect and contributing to improving temperature uniformity; the battery module heat exchange device adopts a surrounding jet structure, further improving the heat exchange effect and temperature uniformity; the battery module heat exchange device does not adopt the immersion method, with less consumption of fluorinated liquid, and can use a fluorinated liquid with better heat exchange effect at a lower cost, improving the heat exchange effect under the condition of lower cost; the fluorinated liquid of the battery module heat exchange device does not contact the ear and the series-parallel components on the upper part of the battery module, avoiding the short-circuit risk caused by the decline of the insulation performance of the fluorinated liquid, and having higher use safety; the battery module heat exchange device places the battery modules in zones, reducing the harm of thermal runaway and having better use safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] As Figure 1 shown is a top view of a battery module heat exchange device of the present application.

[0019] As Figure 2 shown is Figure 1 a schematic diagram of the A-A cross-section in

[0020] As Figure 3 shown is Figure 2 a schematic diagram of the B-B cross-section in

[0021] As Figure 4 shown is Figure 2 a partially enlarged schematic diagram in

[0022] As Figure 5 shown is Figure 2 a partially enlarged schematic diagram in

[0023] As Figure 6 shown is Figure 3 a partially enlarged schematic diagram in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] As Figures 1 to 3 shown, a heat exchange device for a battery module of the present application includes a box body 1, a liquid inlet assembly 2 and a liquid outlet pipe 3. The box body 1 has battery slots 11 formed by separating with a plurality of partition plates 10. A battery module 4 is placed inside the battery slots 11. The upper part of the side of the box body 1 is connected with the liquid inlet assembly 2, and the partition plate 1 has a plurality of evenly distributed spray holes 101. The spray holes 101 communicate the liquid inlet assembly 2 and the battery slots 11. The liquid outlet pipe 3 is installed at the bottom of the box body 1, and the liquid outlet pipe 3 communicates with the bottom of the battery slots 11. The fluorinated liquid reaches the spray holes 101 through the liquid inlet assembly 2, and impacts the side surface of the battery module 4 through the spray holes 101, quickly taking away the heat of the battery module 4. Then the fluorinated liquid flows downward and is discharged through the liquid outlet pipe 3. The fluorinated liquid enters the battery slots 11 in a spraying manner and is quickly discharged through the liquid outlet pipe 3 for circulation. The heat exchange effect and temperature uniformity are better. At the same time, no liquid level is generated inside the battery slots 11, and the amount of fluorinated liquid used is less and the cost is lower; a plurality of battery slots 11 are partitioned, which can play a role in preventing thermal runaway and improve the safety of use; the fluorinated liquid only contacts the side surface of the battery module 4 and does not contact the top of the battery module 4, reducing the short-circuit risk of the battery module 4.

[0026] Specifically, the battery module 4 is composed of a plurality of batteries 41. The top of the battery 41 has a tab 411, and the tabs 411 of different batteries 41 are connected through a series-parallel assembly 42. The tabs 411 and the series-parallel assembly 42 are both located at the top of the battery module 4 and will not contact the fluorinated liquid during the heat exchange process. Compared with the existing immersion liquid cooling scheme, it can effectively avoid the short-circuit risk caused by the decrease in the insulation performance of the fluorinated liquid.

[0027] Since the amount of fluorinated liquid used is less, a relatively low cost can be maintained when selecting the fluorinated liquid.

[0028] The liquid inlet assembly 2 includes a plurality of liquid inlet pipes 21 and a surrounding chamber 22 provided around the side of the box body 1. The liquid inlet pipes 21 are connected with the surrounding chamber 22, and the liquid inlet pipes 21 are connected with an external liquid supply device. The surrounding chamber 22 communicates with the spray holes 101. By providing the surrounding chamber 22, the fluorinated liquid can be more evenly distributed, which helps to improve the temperature uniformity of heat exchange and refrigeration.

[0029] See Figure 4The partition 10 has a liquid storage chamber 100 inside, the injection hole 101 and the liquid inlet assembly 2 are both connected to the liquid storage chamber 100, and the liquid storage chambers 100 of adjacent partitions 10 are connected to each other. The fluorinated liquid is evenly distributed in the liquid storage chamber 100 and evenly sprayed onto the battery module 4 through the injection hole 101.

[0030] Preferably, the injection holes 101 are evenly distributed on the inner side of the battery slot 11 in an array arrangement. The battery slot 11 is closed, and the pressure inside the battery slot 11 is preferably slightly positive. The high-pressure fluorinated liquid fluid can pass through the injection holes 101 to form a high-speed low-temperature jet to impact the surface of the battery module 4, and quickly take away the surface heat of the battery module 4.

[0031] The injection hole 101 adopts a tapered structure, which has the function of increasing pressure and speed, thereby achieving the effect of enhancing heat exchange.

[0032] See also Figure 5 The bottom of the battery container 11 has a drainage hole 111 connected to the liquid outlet pipe 3. Preferably, the drainage hole 111 is located at the center of the bottom of the battery container 11. Furthermore, preferably, the bottom surface of the battery container 11 is conical, and the drainage hole 111 is located at the lowest position of the bottom surface of the battery container 11 to guide the fluorinated liquid to be discharged to the liquid outlet pipe 3 more quickly.

[0033] A plurality of support bars 40 for supporting the battery module 4 are also provided at the bottom of the battery container 11 . The support bars 40 can block the drainage hole 111 after the battery module 4 is placed in the battery container 11 , thus affecting the effective discharge of the fluorinated liquid.

[0034] See also Figure 6 The position where the partition 10 and the surrounding chamber 22 are connected has a plurality of evenly arranged liquid inlet holes 102 , and the fluorinated liquid in the surrounding chamber 22 enters the liquid storage chamber 100 through the liquid inlet holes 102 .

[0035] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery module heat exchange device, characterized in that, It includes a box body, a liquid inlet assembly and a liquid outlet pipe. The box body has battery slots formed by being separated by a number of partition plates. A battery module is placed inside the battery slots. The upper part of the side of the box body is connected to the liquid inlet assembly. And there are a number of uniformly distributed injection holes on the partition plates. The injection holes communicate the liquid inlet assembly and the battery slots. The liquid outlet pipe is installed at the bottom of the box body and is communicated with the bottom of the battery slots. The fluorinated liquid reaches the injection holes through the liquid inlet assembly, jets and impacts the side of the battery module through the injection holes. Then the fluorinated liquid flows downward and is discharged through the liquid outlet pipe.

2. The heat exchange device for the battery module according to claim 1, wherein The liquid inlet assembly includes a number of liquid inlet pipes and a surrounding chamber arranged around the side of the box body. The liquid inlet pipes are connected to the surrounding chamber, and the surrounding chamber is communicated with the injection holes.

3. The battery module heat exchange device according to claim 2, wherein, There is a liquid storage cavity inside the partition plates. The injection holes and the surrounding chamber are both communicated with the liquid storage cavity, and the liquid storage cavities of adjacent partition plates are communicated with each other.

4. The battery module heat exchange device according to claim 3, wherein, There are a number of uniformly arranged liquid inlet holes at the position where the partition plates are docked with the surrounding chamber.

5. The battery module heat exchange device according to claim 4, wherein, The injection hole 1 adopts a tapered structure.

6. The battery module heat exchange device according to claim 1, wherein There is a drain hole communicated with the liquid outlet pipe at the bottom of the battery slots.

7. The battery module heat exchange device according to claim 6, characterized in that, The drain hole is located at the central position of the bottom of the battery slots.

8. The battery module heat exchange device according to claim 7, wherein The bottom surface of the battery slots is conical, and the drain hole is located at the lowest position of the bottom surface of the battery slots.

9. The battery module heat exchange device according to claim 6, characterized in that, A number of support bars for supporting the battery module are arranged at the bottom of the battery slots.

10. The battery module heat exchange device according to claim 1, characterized in that, The battery slots are closed, and the internal pressure of the battery slots is slightly positive pressure.

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