Direct-current immersed battery cooling structure with liquid supplementing function and cooling method

Abstract

The invention relates to the technical field of electrochemical energy storage, in particular to a direct-current immersed battery cooling structure with a liquid supplementing function and a cooling method. The cooling structure comprises a box body and a battery module, an accommodating cavity for mounting a battery module is formed in the middle of the box body, a liquid inlet cavity, a liquid outlet cavity and a liquid supplementing cavity are formed in the side wall of the box body, and the liquid inlet cavity and the liquid outlet cavity are respectively positioned on two opposite side walls of the box body; the battery module comprises battery cells and runner supports which are alternately arranged, liquid inlet holes corresponding to the runner supports in position are formed in the liquid inlet cavity, liquid outlet holes corresponding to the runner supports in position are formed in the liquid outlet cavity, a liquid supplementing pipe is arranged on the side face of the liquid supplementing cavity, and the liquid supplementing pipe extends to the top of the containing cavity. By optimizing the cooling structure, the contact area between the cooling liquid and the battery is increased, the cooling efficiency is improved, the flow resistance is reduced, and the cooling uniformity of the battery is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of electrochemical energy storage, and in particular to a direct current immersion battery cooling structure and a cooling method with a fluid replenishing function. Background Art

[0002] With the development of electrochemical energy storage technology, lithium battery products for energy storage are making continuous breakthroughs in the direction of large capacity, long life and high safety. The operating temperature of energy storage batteries continues to rise with battery charging and discharging. If there is no appropriate heat dissipation solution, the energy storage batteries will not be properly cooled, and the temperature of different parts of the energy storage batteries will vary greatly, affecting the consistency of the energy storage batteries in the system, thereby affecting the overall performance and cycle life of the energy storage batteries. Heat accumulation caused by untimely heat dissipation will also lead to battery safety risks. At present, the vast majority of immersion liquid-cooled energy storage battery box products use a heat dissipation method in which the energy storage batteries are immersed in immersion liquid for cooling. The energy storage batteries are submerged in the immersion liquid, and the immersion liquid absorbs the heat generated by the energy storage batteries when they are working.

[0003] The current typical immersion liquid cooling solution adopts a structure in which the battery module is immersed in the coolant. After the coolant flows in from the liquid inlet, it flows to the liquid outlet through the natural flow channel formed by the gap between the battery modules. Specifically, the battery cells are rectangular and arranged in an array in the box. The coolant only covers the upper surface and side walls (the narrow side of the battery cell), and the flow channel is a non-linear circuitous path. During operation, the coolant absorbs the heat of the battery and the temperature gradually rises, forming a temperature gradient from the liquid inlet to the liquid outlet along the flow direction. Due to the lack of optimized flow channel design, the coolant needs to change direction frequently when flowing, resulting in increased flow resistance and reduced flow rate. In addition, after the coolant flows through multiple battery modules, its heat capacity gradually decreases, and it is unable to maintain effective cooling of subsequent battery modules, which ultimately leads to a stepped temperature difference distribution in the battery pack with low temperature at the liquid inlet and high temperature at the liquid outlet.

[0004] Therefore, the prior art has the following technical problems:

[0005] First, the coolant only contacts the upper surface and narrow sidewalls of the battery cell, and the large surface (i.e., the wide surface, the main heat-generating surface) of the battery cell is not effectively covered, resulting in insufficient contact area and limited heat exchange efficiency.

[0006] Secondly, the non-straight flow channel design causes the coolant flow path to be circuitous, significantly increasing the local flow resistance and reducing the coolant flow rate and overall heat dissipation efficiency;

[0007] In addition, as the coolant flows through multiple battery modules, its temperature gradually increases due to continuous heat absorption. This results in uneven battery temperature distribution along the flow direction (low battery temperature at the inlet end and high battery temperature at the outlet end), affecting the consistency and service life of the battery pack. Summary of the Invention

[0008] In response to the shortcomings of the existing technology, the purpose of the embodiments of the present invention is to provide a DC immersion battery cooling structure with a fluid replenishment function. By optimizing the cooling structure, the contact area between the coolant and the battery is increased, the cooling efficiency is improved, the flow resistance is reduced, and the uniformity of the battery cooling is achieved, thereby ensuring the consistency, overall performance and cycle life of the energy storage lithium battery and reducing battery safety risks.

[0009] In order to achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0010] A DC immersion battery cooling structure with a fluid replenishment function comprises: a box body and a battery module; the box body has a receiving cavity in the middle portion for mounting the battery module, the side walls of the box body are provided with a liquid inlet cavity, a liquid outlet cavity and a fluid replenishment cavity, the liquid inlet cavity and the liquid outlet cavity are respectively located on two opposite side walls of the box body; the battery module comprises alternatingly arranged battery cells and flow channel supports, the liquid inlet cavity is provided with a liquid inlet hole corresponding to the position of the flow channel support, the liquid outlet cavity is provided with a liquid outlet hole corresponding to the position of the flow channel support, a fluid replenishment tube is provided on the side of the fluid replenishment cavity, and the fluid replenishment tube extends to the top of the receiving cavity.

[0011] Optionally, the flow channel support includes vertical supports arranged vertically and horizontal supports arranged horizontally, the vertical supports and the horizontal supports are staggered and connected to form a grid structure, the thickness of the horizontal supports is greater than the thickness of the vertical supports, and the gaps between the horizontal supports form cooling flow channels.

[0012] Optionally, multiple rows of liquid inlet holes are provided on the side of the liquid inlet chamber facing the accommodating chamber, each row of liquid inlet holes corresponds to a flow channel support, and each row has multiple liquid inlet holes arranged vertically, and multiple rows of liquid holes are provided on the side of the liquid outlet chamber facing the accommodating chamber, each row of liquid holes corresponds to a flow channel support, and there is only one liquid hole in each row, which is located at the bottom of the liquid outlet chamber.

[0013] Optionally, multiple battery modules are installed in the accommodating cavity, and the multiple battery modules are parallel to the liquid inlet cavity, and there is a gap between two adjacent battery modules to form a rehydration channel. There are multiple rehydration tubes, and the multiple rehydration tubes are connected to the rehydration cavity. The rehydration tubes are located on the upper side of the rehydration channel between the two battery modules, and a rehydration port is opened on the tube wall of the rehydration tube.

[0014] Optionally, a liquid inlet and a liquid outlet are provided on the outside of the box body, and the liquid inlet and the liquid outlet are located on the same side of the box body and on one side of the liquid outlet cavity of the box body.

[0015] Optionally, the liquid outlet is connected to the liquid outlet cavity, and a double channel is provided on the lower side of the liquid infusion cavity, the double channel including a cooling channel and a liquid infusion channel, the liquid inlet is connected to both the cooling channel and the liquid infusion channel, the liquid infusion channel is located on the upper side of the cooling channel, the upper side of the liquid infusion channel is connected to the liquid infusion cavity, and the end of the cooling channel away from the liquid inlet is connected to the liquid inlet cavity.

[0016] Optionally, multiple modules are connected in series to connect multiple battery modules in series, and are connected to the plug-in through the negative copper bus and the positive copper bus respectively.

[0017] Optionally, a strapping tape is tied around the outside of the battery module, and the strapping tape binds the multiple battery cells and the multiple flow channel supports into a module.

[0018] Optionally, each battery cell is connected in series using a positive electrode sheet, an intermediate electrode sheet and a negative electrode sheet, the lower parts of the positive electrode sheet and the negative electrode sheet are supported by a support seat, and the battery module is fixed to the box body using bolts through the end plate.

[0019] An embodiment of the present invention also provides a cooling method for a DC immersion battery cooling structure with a refilling function as described above, wherein the coolant enters the box through the liquid inlet and is divided into two paths: a cooling channel and a refilling channel; after the cooling channel enters the liquid inlet cavity, it flows through the cooling channel formed by the channel supports between the battery modules, fully contacts the large surface of the battery cell and takes away the heat generated when the battery cell is working; after the refilling channel enters the refilling cavity, it is distributed to the refilling channel between the battery modules through the refilling pipe, and the cooling liquid flowing out of the refilling channel is mixed with the cooling liquid in the cooling channel, and then flows together through the cooling channel of the subsequent battery module; the cooling liquid that has completed the heat exchange is discharged from the battery box through the liquid outlet cavity.

[0020] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0021] 1. In the battery cooling structure of the present invention, a receiving cavity is provided in the middle of the box body for installing the battery module, and a liquid inlet cavity, a liquid outlet cavity and a liquid replenishing cavity are provided on the side wall. The liquid inlet cavity and the liquid outlet cavity are respectively located on two opposite side walls of the box body to facilitate the flow of the coolant. The battery cells in the battery module are arranged alternately with the flow channel supports. The liquid inlet hole on the liquid inlet cavity corresponds to the flow channel support, so that the coolant can accurately flow into each cooling flow channel. The liquid outlet hole on the liquid outlet cavity also corresponds to the flow channel support, which is convenient for the discharge of the liquid after cooling. The liquid replenishing tube on the side of the liquid replenishing cavity extends to the top of the receiving cavity, which is conducive to the uniform distribution and addition of liquid replenishment. The liquid inlet cavity and the liquid outlet cavity are arranged opposite to each other, so that the coolant flows in a straight line through the large surface of the battery cell, solving the problem of increased flow resistance caused by the non-linear flow of the coolant. The alternating arrangement of the flow channel supports cooperates with the cavity layout to ensure that the coolant wraps the five sides of the battery cell (except the bottom), increases the contact area, and improves the heat dissipation efficiency. The refill chamber injects low-temperature refill fluid into the accommodating chamber through the refill tube extending from the top, which mixes with the heated coolant to offset the temperature gradient in the flow direction and improve the temperature difference problem of the battery cell.

[0022] 2. The coolant flows in a straight line inside the battery pack. There is no turning when the coolant flows through the surface of the battery cell, which reduces the flow resistance of the coolant flowing through the surface of the battery cell and makes the coolant flow smoother.

[0023] 3. By using hollow flow channels between the cells in the battery module to support the cells, the contact area between the coolant and the cells is increased, thereby increasing the heat exchange capacity.

[0024] 4. Add a refill channel to the cooling channel, add fresh coolant, replenish the flow of coolant after the battery cell is heated, and reduce the cooling air temperature, so that the coolant can cool all the battery cells more evenly in the direction of the channel.

[0025] Additional advantages of the present invention will be given in the description which follows, and in part will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To more clearly illustrate the embodiments of this application or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some of the embodiments described in this application. For those skilled in the art, other drawings can be derived from these drawings without inventive effort. In addition, the spacing or size between components is exaggerated to show the position of each component, and the schematic diagrams are for illustrative purposes only.

[0027] Figure 1 Schematic diagram of the box body provided by an embodiment of the present invention;

[0028] Figure 2 Schematic diagram of a battery box with the upper cover removed provided by an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the interior of a box from a first perspective provided by an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the interior of the box from a second perspective according to an embodiment of the present invention;

[0031] Figure 5 Schematic diagram of the liquid inlet and dual channels provided in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the connection between the dual channels and the fluid infusion chamber provided by an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the connection between the dual channels and the liquid inlet cavity provided by an embodiment of the present invention;

[0034] Figure 8 Schematic diagram of the liquid inlet cavity provided by an embodiment of the present invention;

[0035] Figure 9 Schematic diagram of a battery module provided by an embodiment of the present invention;

[0036] Figure 10 is a schematic diagram of a flow channel support provided by an embodiment of the present invention;

[0037] In the figure: 1. Box body; 11. Upper cover; 12. Liquid outlet; 13. Battery management system; 14. Plug-in; 15. Liquid inlet; 16. Liquid replenishment chamber; 161. Liquid replenishment tube; 162. Liquid replenishment channel; 17. Liquid inlet chamber; 171. Liquid inlet hole; 172. Cooling channel; 18. Liquid outlet chamber; 181. Liquid outlet hole; 2. Battery module; 21. End plate; 22. Support seat; 23. Positive electrode sheet; 24. Intermediate electrode sheet; 25. Negative electrode sheet; 26. Battery cell; 27. Flow channel support; 271. Vertical support; 272. Horizontal support; 28. Strapping tape; DETAILED DESCRIPTION

[0038] It should be noted that the following detailed description is illustrative and is intended to further illustrate the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0039] Example 1

[0040] like Figure 1 、 Figure 2 As shown, this embodiment proposes a DC immersion battery cooling structure with a liquid replenishing function, comprising: a box 1 and a battery module 2; Figure 3 、 Figure 4 As shown, the top of the box body 1 has an upper cover 11, the middle of the box body 1 has a accommodating cavity for installing the battery module 2, and the side walls of the box body 1 are provided with a liquid inlet cavity 17, a liquid outlet cavity 18 and a liquid replenishing cavity 16, and the liquid inlet cavity 17 and the liquid outlet cavity 18 are respectively located on two opposite side walls of the box body 1; Figure 9 、 Figure 10 As shown, the battery module 2 includes alternatingly arranged battery cells 26 and flow channel supports 27, the liquid inlet cavity 17 is provided with a liquid inlet hole 171 corresponding to the position of the flow channel support 27, the liquid outlet cavity 18 is provided with a liquid outlet hole 181 corresponding to the position of the flow channel support 27, and a liquid infusion tube 161 is provided on the side of the liquid infusion cavity 16, and the liquid infusion tube 161 extends to the top of the accommodating cavity.

[0041] The coolant submerges all batteries and covers all surfaces except the bottom of the battery. The coolant contacts all five surfaces of the battery cell 26, resulting in a large cooling area, high cooling efficiency, and good cooling effect. Through the direct flow channel design, the coolant flows in a straight line, reducing the coolant flow resistance, increasing the liquid flow rate, and improving the heat dissipation efficiency. The refill chamber 16 injects low-temperature refill into the accommodating chamber through the refill tube 161 extending from the top, which mixes with the heated coolant to offset the temperature gradient in the flow channel direction and improve the temperature difference problem of the battery cell 26.

[0042] like Figure 10 As shown, the flow channel support 27 includes a vertical support 271 arranged vertically and a horizontal support 272 arranged horizontally. The vertical support 271 and the horizontal support 272 are staggered and connected to form a grid structure. The thickness of the horizontal support 272 is greater than the thickness of the vertical support 271, and the gaps between the horizontal supports 272 form cooling flow channels.

[0043] The flow channel support 27 adopts a hollow structure, which not only ensures the strength of the support, but also forms an effective cooling flow channel in the gap of the cross support 272. The battery cell 26 is immersed in the immersion liquid except the bottom, which increases the contact area between the coolant and the battery cell 26, improves the heat exchange efficiency, and better realizes the cooling of the battery cell 26.

[0044] like Figure 3 、 Figure 4 As shown, the liquid inlet chamber 17 is provided with a plurality of columns of liquid inlet holes 171 on the side facing the accommodating chamber, each column of liquid inlet holes 171 corresponds to a flow channel support 27, and each column has a plurality of liquid inlet holes 171 arranged vertically, and the liquid outlet chamber 18 is provided with a plurality of columns of liquid holes 181 on the side facing the accommodating chamber, each column of liquid holes 181 corresponds to a flow channel support 27, and there is only one liquid hole 181 in each column, which is located at the bottom of the liquid outlet chamber 18.

[0045] The multiple rows of liquid inlet holes 171 in the liquid inlet chamber 17 correspond to the flow channel supports 27 and are arranged vertically. The liquid inlet holes 171 are larger at the top and smaller at the bottom, which can evenly distribute the coolant into each cooling channel, ensuring that the battery cells 26 corresponding to each flow channel support 27 can be effectively cooled, avoiding poor heat dissipation of some battery cells 26 due to uneven liquid inflow. The liquid outlet chamber 18 has only one liquid hole 181 in each row and is located at the bottom. It adopts a bottom-out method, using the coolant's own weight to reduce flow resistance, facilitates smooth discharge of the coolant, and is conducive to the mixing of the refill, and also facilitates the removal of the immersion liquid during maintenance. The liquid inlet holes 171, the cooling channels between the battery cells 26, and the liquid outlet holes 181 are in the same direction and correspond one to one. The coolant flows evenly along a straight line. The coolant flows along a straight line, reducing the coolant flow resistance, increasing the liquid flow rate, and improving the heat dissipation efficiency.

[0046] Multiple battery modules 2 are installed in the accommodating cavity, and the multiple battery modules 2 are parallel to the liquid inlet cavity 17, and there is a gap between two adjacent battery modules 2 to form a liquid infusion channel. There are multiple liquid infusion tubes 161, and the multiple liquid infusion tubes 161 are connected to the liquid infusion cavity 16. The liquid infusion tube 161 is located on the upper side of the liquid infusion channel between the two battery modules 2, and multiple liquid infusion ports are opened on the tube wall of the liquid infusion tube 161, and each liquid infusion port corresponds to a liquid inlet hole 171.

[0047] The gap between adjacent battery modules 2 serves as a fluid replenishment channel, providing a channel for fluid replenishment. Multiple fluid replenishment tubes 161 are connected to the fluid replenishment cavity 16 and are located on the upper side of the fluid replenishment channel. The fluid replenishment port on the tube wall facilitates the dispersion and inflow of fluid replenishment, so that the fluid replenishment can evenly enter the fluid replenishment channel between each battery module 2, mix with the heated coolant below, replenish the flow of the coolant after being heated by the battery cell 26 and reduce the temperature, so that all battery cells 26 in the flow channel direction are cooled more evenly, effectively solving the problem of uneven battery pack temperature caused by the increase in coolant temperature.

[0048] like Figure 1 As shown, the outer side of the housing 1 is provided with a liquid inlet 15 and a liquid outlet 12, which are located on the same side of the housing 1 and on the side of the liquid outlet cavity 18 of the housing 1. This layout design is conducive to simplifying the pipeline connection and facilitating the introduction and discharge of the coolant. At the same time, the centralized arrangement of the liquid inlet and outlet helps to optimize the utilization of the internal space of the housing 1 and improve the compactness of the overall structure. Together with the liquid inlet cavity 17, the liquid outlet cavity 18 and other components, it constitutes a complete coolant circulation system, ensuring that the coolant can flow efficiently between the battery modules 2 and achieve effective cooling of the battery cells 26.

[0049] The liquid outlet 12 is connected to the liquid outlet cavity 18. Figure 5 、 Figure 6 、 Figure 7 、 Figure 8As shown, a double channel is provided on the lower side of the fluid replenishment chamber 16, and the double channel includes a cooling channel 172 and a fluid replenishment channel 162. The fluid inlet 15 is connected to both the cooling channel 172 and the fluid replenishment channel 162. The fluid replenishment channel 162 is located on the upper side of the cooling channel 172, and the upper side of the fluid replenishment channel 162 is connected to the fluid replenishment chamber 16. The end of the cooling channel 172 away from the fluid inlet 15 is connected to the fluid inlet chamber 17.

[0050] The liquid outlet 12 is connected to the liquid outlet chamber 18, ensuring the smooth discharge of the coolant; the dual channels on the lower side of the refill chamber 16 include a cooling channel 172 and a refill channel 162, and the liquid inlet 15 is connected to both of them, and the refill channel 162 is located on the upper side of the cooling channel 172 and is connected to the refill chamber 16, and the other end of the cooling channel 172 is connected to the liquid inlet chamber 17. This design enables the coolant to be reasonably diverted after entering from the liquid inlet 15. One path enters the cooling channel 172 to participate in the cooling of the battery cell 26, and the other path enters the refill channel 162 to provide refill for the refill chamber 16. The layered arrangement of the two channels avoids mutual interference, ensuring the orderly flow of coolant and refill, and cooperates with the position settings of the liquid inlet 15 and the liquid outlet 12, further optimizing the circulation path of the coolant, improving the operating efficiency and stability of the cooling system, and better meeting the battery cooling needs.

[0051] like Figure 9 As shown, multiple module series rows connect multiple battery modules 2 in series, and are connected to the plug-in 14 through the negative copper bus and the positive copper bus respectively, thereby realizing the electrical connection between the battery modules 2. A battery management system 13 is also provided on the box 1 to ensure the normal operation and power output of the entire battery.

[0052] The battery module 2 is tied with a strapping tape 28 on the outside, and the strapping tape 28 bundles multiple battery cells 26 and multiple flow channel supports 27 into a module, thereby enhancing the integrity and stability of the battery module 2 and preventing the battery cells 26 and the flow channel supports 27 from being displaced or loosened during use, thereby ensuring that the shape and position of the cooling flow channel remain unchanged, ensuring that the coolant can flow along the designed path, and closely cooperate with each component to achieve effective cooling.

[0053] Each battery cell 26 is connected in series using a positive electrode sheet 23, an intermediate electrode sheet 24 and a negative electrode sheet 25. The lower parts of the positive electrode sheet 23 and the negative electrode sheet 25 are supported by a support base 22, so that the connection between the battery cells 26 is stable and reliable, ensuring the electrical performance of the battery; the battery module 2 is fixed to the box body 1 using bolts through the end plate 21, which strengthens the connection strength between the battery module 2 and the box body 1, ensuring that during the operation of the battery, the module will not loosen due to factors such as vibration, thereby maintaining the normal working state of the cooling system and the electrical connection system.

[0054] To sum up, hollow flow channel supports 27 are used between the battery cells 26 in the modules inside the energy storage battery box. The flow channel supports 27 play a supporting role between the battery cells 26 and are also immersion liquid cooling channels between the battery cells 26. The coolant flows through the surface of the battery cells 26 and takes away the heat generated by the battery cells 26 when working.

[0055] The battery box adopts a front-to-back liquid inlet method, adopting a back-in-front-out method. The coolant enters through the liquid inlet 15 of the box body 1, passes through the flow channel between the battery cells 26, and is fully in contact with the large surface of the battery cells 26 for cooling, and then flows through the liquid outlet 12 to be discharged from the battery box. The liquid inlet 15, the flow channel between the battery cells 26 and the liquid outlet 12 are in the same direction. Each liquid inlet hole 171, the cooling flow channel between the battery cells 26 and the liquid outlet hole 181 correspond one to one, and the coolant flows in a straight line.

[0056] There is a refill tube 161 on the upper part of the battery module 2 inside the box 1, and the lower side of the refill tube 161 is the inter-module refill channel. The coolant enters from the liquid inlet 15, and the temperature of the coolant rises after flowing through the battery module 2. It passes through the refill at the top, flows through the refill channel, and enters the cooling channel, replenishing the amount of coolant heated by the battery cell 26 and the temperature of the coolant, so that the temperature of the coolant is consistent when flowing through the battery.

[0057] Example 2

[0058] This embodiment provides a cooling method for a DC immersion battery cooling structure with a refilling function as described in Example 1, wherein the coolant is injected by an external liquid cooling system. After entering the box body 1 from the liquid inlet 15, the coolant is divided into two paths: a cooling channel 172 and a refilling channel 162. The cooling channel 172 enters the liquid inlet cavity 17 and flows through the cooling channels of each battery module 2 in sequence, making full contact with the large surface of the battery cell 26 to remove heat, thereby achieving effective cooling of the battery cell 26; the refilling channel 162 enters the refilling cavity 16 and is distributed to the refilling channels between each battery module 2 through the refilling tube 161. The refilling liquid is mixed with the coolant in the cooling channel 172 and flows through the cooling channels of subsequent battery modules 2, replenishing the flow rate of the coolant and reducing the temperature, so that the cooling effect of the coolant on the battery cell 26 is more uniform and consistent in the entire flow channel direction. Finally, the coolant that has completed the heat exchange is discharged from the battery box through the liquid outlet cavity 18.

[0059] When the DC immersion battery box is running, the temperature of the coolant inlet 15 is T 进 After flowing through the first battery module 2, the coolant absorbs the heat released by the battery cells 26 in the battery module 2, and the coolant temperature rises by △T. When the coolant enters between the first and second battery modules 2, it increases the refill through the refill pipe 161. The coolant temperature in the refill pipe 161 is T 进The temperature of the refill channel is approximately the same as the coolant inlet temperature. After the coolant of the first battery module 2 is mixed with the refill, it enters the second battery module 2. The refill cools the coolant entering the second battery module 2 to a temperature close to T 进 , so that the cooling effect of the coolant flowing through the first battery module 2 and the second battery module 2 is approximately the same, the heat generated by each battery module 2 in the battery box is approximately the same, the temperature rise of all battery cells 26 in the liquid replenishment cooling battery box is the same, and the temperature difference of the battery cells 26 will also be consistent, allowing the coolant to cool all battery cells 26 more evenly in the flow direction.

[0060] This cooling method effectively solves the problems of uneven battery temperature and low heat dissipation efficiency in existing immersion liquid cooling technologies through reasonable coolant diversion, refilling, and mixing steps. It ensures the temperature stability of the battery during operation, extends the battery life, and improves the safety and reliability of the battery system.

[0061] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A DC immersion battery cooling structure with a liquid replenishing function, characterized in that: include: Box and battery module; The middle part of the box body has a receiving cavity for installing the battery module, and the side walls of the box body are provided with a liquid inlet cavity, a liquid outlet cavity and a liquid replenishing cavity, and the liquid inlet cavity and the liquid outlet cavity are respectively located on two opposite side walls of the box body; The battery module includes alternatingly arranged battery cells and flow channel supports, the liquid inlet cavity is provided with a liquid inlet hole corresponding to the flow channel support position, the liquid outlet cavity is provided with a liquid outlet hole corresponding to the flow channel support position, a liquid infusion tube is provided on the side of the liquid infusion cavity, and the liquid infusion tube extends to the top of the accommodating cavity.

2. The DC immersion battery cooling structure with liquid replenishment function according to claim 1, characterized in that: The flow channel support includes vertical supports arranged vertically and horizontal supports arranged horizontally. The vertical supports and the horizontal supports are staggered and connected to form a grid structure. The thickness of the horizontal supports is greater than that of the vertical supports. The gaps between the horizontal supports form cooling flow channels.

3. The DC immersion battery cooling structure with liquid replenishment function according to claim 1, characterized in that: A plurality of rows of liquid inlet holes are provided on the side of the liquid inlet cavity facing the accommodating cavity, each row of liquid inlet holes corresponds to a flow channel support, and each row has a plurality of liquid inlet holes arranged vertically; a plurality of rows of liquid holes are provided on the side of the liquid outlet cavity facing the accommodating cavity, each row of liquid holes corresponds to a flow channel support, and there is only one liquid hole in each row, which is located at the bottom of the liquid outlet cavity.

4. The DC immersion battery cooling structure with liquid replenishment function according to claim 1, characterized in that: Multiple battery modules are installed in the accommodating cavity, and the multiple battery modules are parallel to the liquid inlet cavity. There is a gap between two adjacent battery modules to form a rehydration flow channel. There are multiple rehydration tubes, and the multiple rehydration tubes are connected to the rehydration cavity. The rehydration tubes are located on the upper side of the rehydration flow channel between the two battery modules, and a rehydration port is opened on the tube wall of the rehydration tube.

5. The DC immersion battery cooling structure with liquid replenishment function according to claim 1, characterized in that: A liquid inlet and a liquid outlet are provided on the outer side of the box body. The liquid inlet and the liquid outlet are located on the same side of the box body and on one side of the liquid outlet cavity of the box body.

6. The DC immersion battery cooling structure with liquid replenishment function according to claim 5, characterized in that: The liquid outlet is connected to the liquid outlet cavity, and a double channel is provided on the lower side of the liquid infusion cavity, and the double channel includes a cooling channel and a liquid infusion channel. The liquid inlet is connected to both the cooling channel and the liquid infusion channel. The liquid infusion channel is located on the upper side of the cooling channel, and the upper side of the liquid infusion channel is connected to the liquid infusion cavity. The end of the cooling channel away from the liquid inlet is connected to the liquid inlet cavity.

7. The DC immersion battery cooling structure with liquid replenishment function according to claim 4, characterized in that: Multiple modules are connected in series, and multiple battery modules are connected in series, and connected to the plug-in through the negative copper bus and the positive copper bus respectively.

8. The DC immersion battery cooling structure with liquid replenishment function according to claim 7, characterized in that: The battery module is bound with a strapping tape on the outside, and the strapping tape binds the multiple battery cells and the multiple flow channel supports into a module.

9. The DC immersion battery cooling structure with liquid replenishment function according to claim 8, characterized in that: Each battery cell is connected in series using a positive electrode sheet, an intermediate electrode sheet and a negative electrode sheet. The lower parts of the positive and negative electrode sheets are supported by support seats, and the battery module is fixed to the box body with bolts through the end plates.

10. A cooling method for a DC immersion battery cooling structure with a liquid replenishing function according to any one of claims 1 to 9, characterized in that: After the coolant enters the box through the liquid inlet, it is divided into two channels: the cooling channel and the liquid replenishing channel; After entering the liquid inlet cavity, the cooling channel flows through the cooling channel formed by the flow channel supports between the battery modules, making full contact with the large surface of the battery cell and taking away the heat generated by the battery cell during operation; After the refill channel enters the refill cavity, it is distributed to the refill flow channels between each battery module through the refill pipe. The coolant flowing out of the refill flow channel mixes with the coolant in the cooling channel and then flows through the cooling flow channels of the subsequent battery modules together. The coolant that has completed heat exchange is discharged from the battery box through the liquid outlet cavity.

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