Cooling liquid circulation equipment for new energy automobile battery pack

Abstract

The invention relates to cooling liquid circulation equipment for a new energy automobile battery pack. The cooling liquid circulation equipment comprises a circulation pipeline system; the circulating pipeline system comprises a main circulating pipe, and two ends of the main circulating pipe are respectively connected with an outlet and an inlet of the liquid storage tank; one end of each branch circulating pipe is communicated with the main circulating pipe, and the other end of each branch circulating pipe is communicated with the communicating pipe through a branch pipe; a plurality of communicating pipes are arranged, and each communicating pipe is attached to the surface of a single battery cell of the battery pack; the flow adjusting units are arranged on the branch circulating pipes and used for independently adjusting the cooling liquid flow of the corresponding branch pipelines. The filtering unit is arranged between the outlet of the liquid storage tank and the main circulating pipe; according to the invention, each branch circulating pipe is provided with the electromagnetic proportional valve, so that the cooling liquid flow of the corresponding branch pipeline can be independently adjusted according to the actual temperature difference of each battery cell, the uniform temperature control of each battery cell is realized, excessive or insufficient heat dissipation of part of battery cells is avoided, and the overall performance and safety of the battery pack are improved.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, specifically to a coolant circulation device for new energy vehicle battery packs. Background Technology

[0002] With the global energy structure transformation and increased environmental awareness, the new energy vehicle industry is entering a period of rapid development. As the core power source of new energy vehicles, the performance and safety of the power battery directly determine the overall quality of the vehicle. During operation, the power battery continuously generates heat. If this heat cannot be dissipated in time, the battery pack temperature will rise, leading to cell capacity decay, decreased charging and discharging efficiency, and in severe cases, even thermal runaway, causing safety accidents. Therefore, an efficient battery thermal management system has become a crucial aspect of new energy vehicle research and development. Currently, cooling technologies for new energy vehicle battery packs are mainly divided into three categories: air cooling, water cooling, and liquid cooling. Among them, air cooling technology dissipates heat by driving airflow with a fan, which has the advantages of simple structure and low cost, but its heat dissipation efficiency is relatively low and is greatly affected by ambient temperature, making it difficult to meet the heat dissipation requirements of high-power battery packs. Water cooling technology uses water as the cooling medium, which carries away heat through pipe circulation. Its heat dissipation efficiency is better than air cooling, but water has a limited thermal conductivity and there are risks of freezing and corrosion of pipes. Its reliability is insufficient in extreme low or high temperature environments. Liquid cooling technology uses a special coolant as the heat dissipation medium. Due to the excellent thermal conductivity and temperature stability of the coolant, it has become the mainstream cooling solution. However, existing liquid-cooled coolant circulation equipment still faces significant technical bottlenecks: First, the circulation path design is simplistic, with coolant often flowing in a fixed direction via series or parallel connections. This makes it impossible to dynamically adjust the flow rate based on the heat dissipation differences in different areas of the battery pack, resulting in large temperature differences between cells and insufficient heat dissipation in some high-heat areas. Second, the performance of the cooling medium needs improvement. Traditional coolants suffer from low thermal conductivity, high volatility at high temperatures, and poor fluidity at low temperatures. Furthermore, some coolant components pose a risk of corrosion to battery cells or pipe materials, affecting the equipment's lifespan. Third, the equipment structure is complex and maintenance costs are high. Existing circulation equipment often uses integrated cooling pipe designs, requiring the disassembly of numerous components for coolant replacement, which is cumbersome and prone to air contamination during the replacement process, affecting circulation efficiency. Fourth, the level of intelligence is insufficient. Most equipment can only achieve simple start-stop control and cannot deeply integrate with the battery management system (BMS), making it difficult to dynamically adjust the cooling strategy based on real-time battery temperature and charge / discharge status, leading to energy waste or insufficient heat dissipation. To address the shortcomings of existing technologies, there is an urgent need to develop a coolant circulation device with a flexible and adjustable circulation path, excellent cooling medium performance, convenient structural maintenance, and a high degree of intelligence. This would solve the problems of low heat dissipation efficiency, large temperature difference, and insufficient reliability of current new energy vehicle battery packs, and promote the upgrading of new energy vehicle battery thermal management technology. Summary of the Invention

[0003] The purpose of this invention is to provide a coolant circulation device for battery packs in new energy vehicles to solve the above-mentioned problems.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a coolant circulation device for a new energy vehicle battery pack, comprising: a circulation pipeline system; the circulation pipeline system includes a main circulation pipe, the two ends of which are respectively connected to the outlet and inlet of a storage tank; several branch circulation pipes, one end of each branch circulation pipe being connected to the main circulation pipe, and the other end being connected to a connecting pipe via a branch pipe; several connecting pipes, each connecting pipe being attached to the surface of a single cell of the battery pack; a flow regulation unit, disposed on each branch circulation pipe, for independently regulating the coolant flow rate of the corresponding branch pipe; a filtration unit, disposed between the outlet of the storage tank and the main circulation pipe; the filtration unit includes a filter box; a double-layer filter structure, disposed inside the filter box; and a first rectangular filter plate on the upper layer and a second rectangular filter plate on the lower layer arranged sequentially along the coolant flow direction.

[0005] Preferably, the flow regulating unit is an electromagnetic proportional valve, which can adjust the valve opening through a current signal to achieve independent control of the coolant flow in the branch pipeline.

[0006] Preferably, the branch circulation pipe adopts a microchannel structure design, and the inner wall of the pipe is provided with several raised guide ribs, which are distributed in a spiral shape.

[0007] Preferably, it also includes a replenishment port and an exhaust valve, installed at both ends of the top surface of the storage tank; A drain pipe is installed on the bottom surface of the storage tank, and a valve is provided on the drain pipe.

[0008] Preferably, it also includes a first transmission pipe, one end of which is connected to one end of the main circulation pipe and the other end of which is connected to the inlet of the storage tank; The second transmission pipe has one end connected to the other end of the main circulation pipe and the other end connected to the outlet of the filter box. The third transmission pipe is connected at one end to the outlet of the liquid storage tank and at the other end to the inlet of the filter box.

[0009] Preferably, it also includes a mounting frame, wherein the battery pack is mounted at one end of the mounting frame; A fixing frame is fitted onto the outer wall of the liquid storage tank, and a base plate is provided on its bottom surface. The base plate is connected to the mounting frame by bolts. A base frame is installed on the bottom surface of the filter box, and the base frame is connected to the mounting frame by bolts.

[0010] Preferably, the first rectangular filter plate uses a 50μm stainless steel filter screen, and the second rectangular filter plate uses a 10μm polymer filter screen.

[0011] Preferably, it also includes clamps, with two sets provided, respectively fitted onto both ends of the outer wall of the main circulation pipe; There are two brackets, one on the bottom surface of each of the two sets of clamps, and they are connected to the mounting frame by bolts.

[0012] Preferably, it also includes temperature sensors, of which several are provided, and each temperature sensor is attached to the surface of the corresponding cell.

[0013] The present invention has at least the following beneficial effects: 1. This invention equips each branch circulation pipe with an electromagnetic proportional valve, which can receive current signals from the battery management system (BMS) and independently adjust the coolant flow rate of the corresponding branch pipe based on the real-time temperature of each individual cell collected by the temperature sensor (valve opening is continuously adjustable from 0-100%). When the temperature of a cell is higher than a set threshold, the electromagnetic proportional valve increases the opening to increase the flow rate and enhance heat dissipation; when the cell temperature is too low, the valve decreases the opening to avoid excessive heat dissipation. This effectively solves the problem that the fixed flow rate of traditional equipment cannot adapt to regional temperature differences, achieves uniform temperature control of each cell, and eliminates capacity decay and reduced charging and discharging efficiency caused by insufficient heat dissipation of some cells, or energy waste caused by excessive heat dissipation, significantly improving the overall working stability and service life of the battery pack. 2. This invention effectively intercepts larger impurities (such as metal shavings, rubber particles detached from aging pipes, etc.) in the coolant using a 50μm stainless steel filter, preventing large impurities from clogging microchannels or scratching the surface of the battery cell. The 10μm polymer filter further filters out tiny impurities (such as dust, colloidal particles produced by coolant oxidation, etc.), preventing tiny impurities from adhering to the surface of the battery cell and affecting thermal conductivity, or entering the electromagnetic proportional valve and affecting valve precision. The dual-layer filtration design significantly improves the cleanliness of the coolant, avoiding heat dissipation failure caused by blockage of the circulation pipeline, reducing wear on core components of the equipment (such as electromagnetic proportional valves and connecting pipes) caused by impurities, extending the overall service life of the equipment, and reducing the frequency of coolant replacement, thus reducing maintenance costs. 3. The equipment uses a mounting frame as its basic framework. Core components such as the battery pack, liquid storage tank, filter box, and main circulation pipe are all connected to the mounting frame via independent fixing structures. The liquid storage tank is bolted to the mounting frame via a fixing bracket fitted on the outer wall and a base plate. The filter box is bolted to the mounting frame via a bottom frame. The main circulation pipe is fixed to the mounting frame with clamps and brackets. This modular design not only adapts to the complex installation space of new energy vehicles but also ensures that there is no shaking or displacement of components during vehicle operation, improving structural stability. At the same time, each component can be disassembled and installed individually, facilitating assembly on the production line and subsequent maintenance and replacement. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3 This is a schematic diagram of the filter box of the present invention; Figure 4 This is a cross-sectional view of the filter box of the present invention.

[0015] In the attached diagram, the following are the reference numerals: 1. Mounting frame; 2. Battery pack; 3. Battery cell; 4. Temperature sensor; 5. Connecting pipe; 6. Branch pipe; 7. Branch circulation pipe; 8. Electromagnetic proportional valve; 9. Main circulation pipe; 10. Clamp; 11. Bracket; 12. Liquid storage tank; 13. Drain pipe; 14. Fixing frame; 15. First transmission pipe; 16. Exhaust valve; 17. Liquid replenishment port; 18. Filter box; 181. First rectangular filter plate; 182. Second rectangular filter plate; 19. Second transmission pipe; 20. Third transmission pipe; 21. Base frame; 22. Base plate. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please refer to Figure 1 This invention provides a technical solution: a coolant circulation device for a new energy vehicle battery pack, comprising a circulation pipeline system to provide a channel for coolant flow, including a main circulation pipe 9, which has a tubular structure, with its two ends connected to the outlet and inlet of a storage tank 12 via a second transmission pipe 19 and a first transmission pipe 15, respectively, forming the main channel for coolant circulation. Several branch circulation pipes 7 are provided, each branch circulation pipe 7 having one end connected to the main circulation pipe 9 and the other end connected to a connecting pipe 5 via a branch pipe 6. The branch circulation pipes 7 adopt a microchannel structure design, with several [missing information - likely related to a specific type of pipe or tube]. The raised guide ribs 71 are spirally distributed to guide the coolant to flow in a spiral shape within the pipe, increasing the contact area and flow time between the coolant and the pipe wall, thus improving heat exchange efficiency and preventing the generation of local eddies. Several connecting pipes 5 are provided, each of which is attached to the surface of a single cell 3 of the battery pack 2 (and can be fixed with thermally conductive adhesive) to directly transfer the cooling capacity of the coolant to the cell 3, achieving direct heat dissipation of the cell 3. The connecting pipes 5 are made of a metal material with high thermal conductivity (such as aluminum alloy or copper alloy) to further improve the heat exchange effect.

[0018] Reference Figures 1-2 The first transmission pipe 15 is connected at one end to one end of the main circulation pipe 9 and at the other end to the inlet of the storage tank 12, and is used to transport the coolant in the main circulation pipe 9 back to the storage tank 12. The second transmission pipe 19 is connected at one end to the other end of the main circulation pipe 9 and at the other end to the outlet of the filter box 18, and is used to transport the filtered coolant to the main circulation pipe 9. The third transmission pipe 20 is connected at one end to the outlet of the storage tank 12 and at the other end to the inlet of the filter box 18, and is used to transport the coolant in the storage tank 12 to the filter box 18 for filtration.

[0019] Reference Figure 1 The flow regulation unit is installed on each branch circulation pipe 7 to independently regulate the coolant flow rate of the corresponding branch pipe. The specific structure is as follows: The flow regulation unit uses an electromagnetic proportional valve 8. The electromagnetic proportional valve 8 can receive current signals sent by an external controller (such as a battery management system, BMS) to precisely adjust the valve opening (the opening adjustment range is 0-100%), thereby realizing independent and continuous control of the coolant flow in the branch pipeline. By collecting the temperature data of each cell 3 in real time through the battery management system, the opening of the corresponding electromagnetic proportional valve 8 can be dynamically adjusted according to the temperature difference of each cell 3 to ensure that the cell 3 with a higher temperature receives a larger coolant flow and the cell 3 with a lower temperature receives a smaller coolant flow, thereby achieving uniform temperature control of each cell 3.

[0020] Reference Figure 3 and Figure 4 The filtration unit is located between the outlet of the liquid storage tank 12 and the main circulation pipe 9, specifically connected to the liquid storage tank 12 and the main circulation pipe 9 via the third transmission pipe 20 and the second transmission pipe 19. It is used to filter impurities in the coolant, and its specific structure is as follows: The filter box 18 has a rectangular box structure, with an internal filtration chamber for containing coolant. The inlet of the filter box 18 is connected to the third transmission pipe 20, and the outlet is connected to the second transmission pipe 19. A double-layer filter structure is set inside the filter box 18. Along the coolant flow direction from the inlet to the outlet, the upper first rectangular filter plate 181 and the lower second rectangular filter plate 182 are arranged sequentially. The first rectangular filter plate 181 uses a 50μm stainless steel filter screen to filter larger impurities (such as metal fragments, rubber particles, etc.) in the coolant. The second rectangular filter plate 182 uses a 10μm polymer filter screen (such as a polytetrafluoroethylene filter screen) to filter smaller impurities (such as dust, colloidal particles, etc.) in the coolant. The double-layer filter structure can achieve graded filtration of coolant, greatly improve the filtration effect, and prevent impurities from clogging the circulation pipes or damaging components.

[0021] Reference Figure 1 The liquid storage tank 12 is used to store coolant and also serves as a buffer and venting unit. Its specific structure is as follows: The top surface of the liquid storage tank 12 is equipped with a liquid inlet 17 and an exhaust valve 16 at both ends. The liquid inlet 17 is used to replenish the liquid storage tank 12 with coolant and is normally sealed by a sealing cap. The exhaust valve 16 is used to discharge the gas dissolved in the coolant to prevent the gas from forming a gas block in the circulation pipeline, which would affect the flow of coolant and the heat dissipation effect. The bottom surface of the liquid storage tank 12 is equipped with a drain pipe 13, which is equipped with a valve to drain the coolant in the liquid storage tank 12 during equipment maintenance.

[0022] It also includes a mounting frame 1 with a frame structure, a battery pack 2 mounted on one end of the mounting frame 1, the mounting frame 1 being made of high-strength aluminum alloy to ensure structural strength while reducing weight, a fixing bracket 14 fitted onto the outer wall of the liquid storage tank 12, a base plate 22 on the bottom surface of the fixing bracket 14, the base plate 22 being connected to the mounting frame 1 by bolts to fix the liquid storage tank 12, a base frame 21 set on the bottom surface of the filter box 18, the base frame 21 being connected to the mounting frame 1 by bolts to fix the filter box 18, a bracket 11 and a clamp 10, the main circulation pipe 9 being fixed to the mounting frame 1 by the bracket 11 and the clamp 10 to ensure that the main circulation pipe 9 will not shake or shift during vehicle operation.

[0023] It also includes several temperature sensors 4, each of which is attached to the surface of the corresponding cell 3 to collect temperature data of each cell 3 in real time and transmit the data to the battery management system (BMS) to provide data support for the opening adjustment of the electromagnetic proportional valve 8.

[0024] Working principle: Before starting the equipment, coolant filling and venting operations must be completed to lay the foundation for subsequent circulation. The specific steps are as follows: Coolant filling: Open the sealing cap of the filler port 17 on the top surface of the reservoir 12, and inject sufficient amount of suitable coolant (such as ethylene glycol aqueous solution) into the reservoir 12 until the coolant level reaches the specified scale range of the reservoir 12. Then close the sealing cap of the filler port 17 to prevent coolant leakage or impurities from entering during circulation.

[0025] System venting: Open the vent valve 16 on the top surface of the coolant tank 12. Using the weight of the coolant itself and the initial pressure of the system, the dissolved air in the coolant and the residual gas in the circulation pipeline are vented. After the gas is vented through the vent valve 16, air resistance can be avoided in subsequent circulation, preventing the coolant flow from being obstructed and the heat exchange efficiency from decreasing. When no more air bubbles are vented from the vent valve 16, close the vent valve 16 to complete the preliminary preparation.

[0026] After the equipment starts up, the coolant enters a closed-loop cycle of storage, filtration, diversion, heat dissipation, and return. Simultaneously, combined with the dynamic adjustment of temperature sensor 4 and electromagnetic proportional valve 8, temperature uniformity control of each battery cell 3 is achieved. The specific process is as follows: The coolant in the storage tank 12, driven by the system power, enters the filter box 18 through the third transmission pipe 20, initiating the staged filtration process. Coarse filtration stage: The coolant first flows through the first rectangular filter plate 181 in the upper layer of the filter box 18. This filter plate uses a 50μm stainless steel filter screen, which can intercept larger impurities in the coolant (such as metal fragments, rubber particles that have fallen off due to aging of pipes, etc.), and prevent large impurities from entering the subsequent pipelines to block the microchannels or damage the components. Fine filtration stage: After coarse filtration, the coolant continues to flow downward and passes through the second rectangular filter plate 182 in the lower layer. This filter plate uses a 10μm polymer filter (such as a polytetrafluoroethylene filter) to further filter out tiny impurities (such as dust and colloidal particles generated by coolant oxidation), ensuring the cleanliness of the coolant entering the main circulation and reducing the impact of impurities on heat exchange efficiency. Entering the main circulation: The coolant that has completed the staged filtration is transported to the main circulation pipe 9 through the second transmission pipe 19 connected to the outlet of the filter box 18, and enters the heat dissipation stage.

[0027] After receiving the filtered coolant, the main circulation pipe 9 distributes it evenly to several branch circulation pipes 7. The branch pipes work together to dissipate heat from the battery cell 3. The specific process is as follows: Branch pipe flow optimization: Branch circulation pipe 7 adopts a microchannel structure design with spirally distributed raised guide ribs on the inner wall of the pipe. The coolant flows in a spiral shape under the guidance of the guide ribs. On the one hand, it increases the contact area and flow time between the coolant and the inner wall of the branch pipe, thereby improving the basic efficiency of heat exchange. On the other hand, it avoids the generation of local eddies, ensures stable flow, and lays the foundation for subsequent precise flow control. Cooling is transferred to the battery cell 3: The coolant in the branch circulation pipe 7 is delivered to the connecting pipe 5 corresponding to a single battery cell 3 through the branch pipe 6. The connecting pipe 5 is tightly attached to the surface of the battery cell 3 with thermally conductive adhesive and is made of aluminum alloy or copper alloy with high thermal conductivity. It can directly and efficiently transfer the cooling capacity of the coolant to the battery cell 3, quickly absorb the heat generated by the battery cell 3 during operation, and achieve point-to-point precise heat dissipation. Coolant return: The coolant that has completed heat absorption (temperature rise) returns to the storage tank 12 through the first transmission pipe 15 connected to the other end of the main circulation pipe 9. This completes a complete closed-loop circulation of coolant. The returned coolant can re-enter the filtration and diversion process to continuously dissipate heat for the battery cell 3.

[0028] During the coolant circulation process, the equipment dynamically adjusts the flow rate based on the temperature difference of each battery cell 3 through the linkage of temperature sensor 4 and electromagnetic proportional valve 8, to avoid excessive or insufficient heat dissipation of some battery cells 3. The specific control logic is as follows: Temperature data acquisition: Several temperature sensors 4 are attached to the surface of the corresponding battery cell 3 to collect the temperature data of each battery cell 3 in real time and transmit the data synchronously to the battery management system (BMS). BMS command output: After receiving the temperature data, the BMS compares it with the preset safe temperature threshold for cell 3: If the temperature of a certain cell 3 is higher than the threshold, the BMS will output a signal to increase the current to the electromagnetic proportional valve 8 on the corresponding branch circulation pipe 7. If the temperature of a certain cell 3 is lower than the threshold, the BMS outputs a signal to the corresponding electromagnetic proportional valve 8 to reduce the current. Proportional valve opening adjustment: After receiving the BMS signal, the electromagnetic proportional valve 8 precisely adjusts the valve opening through current changes. When the current increases, the valve opening increases, the coolant flow rate of the corresponding branch circulation pipe 7 increases, the cooling supply increases, the heat dissipation effect of the battery cell 3 is enhanced, and the temperature drops rapidly to the threshold range. When the current decreases, the valve opening decreases, and the coolant flow rate of the corresponding branch circulation pipe 7 decreases, thus preventing the battery cell 3 from overheating and maintaining a stable temperature. Through the closed-loop control of data collection, analysis, and adjustment, the temperature of all cells 3 is controlled, ensuring the overall operating performance and safety of the battery pack 2.

[0029] When the equipment requires regular maintenance, the coolant in the system can be drained through the drain pipe 13 (with a control valve on the drain pipe 13) at the bottom of the storage tank 12. Then, the filter box 18 can be disassembled separately, and the first rectangular filter plate 181 and the second rectangular filter plate 182 inside can be taken out for cleaning or replacement to remove impurities trapped by the filter screen and restore the filtration effect. After maintenance, the coolant can be refilled through the replenishment port 17 and the air can be vented. The equipment can then be put back into use. The entire maintenance process does not require disassembling the entire circulation pipeline, making the operation convenient.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cooling liquid circulating device for a new energy automobile battery pack, characterized by, The application relates to a circulating pipeline system. The circulating pipeline system comprises a main circulating pipeline (9) connected with the outlet and the inlet of a liquid storage tank (12) respectively, branch circulating pipelines (7) provided with a plurality of branch circulating pipelines (7), one end of each of the branch circulating pipelines (7) being communicated with the main circulating pipeline (9), the other end of each of the branch circulating pipelines (7) being communicated with a communicating pipeline (5) through a branch pipeline (6), the communicating pipeline (5) being provided with a plurality of communicating pipelines (5), each of the communicating pipelines (5) being attached to the surface of a single battery cell (3) of a battery pack (2), a flow regulating unit provided on each of the branch circulating pipelines (7) and used for independently regulating the flow of cooling liquid of the corresponding branch pipeline, a filtering unit arranged between the outlet of the liquid storage tank (12) and the main circulating pipeline (9), the filtering unit comprising a filtering box (18), a double-layer filter screen structure arranged in the filtering box (18), and a first rectangular filter plate (181) and a second rectangular filter plate (182) arranged in sequence along the flow direction of the cooling liquid. The flow regulating unit is an electromagnetic proportional valve (8), the opening degree of the valve can be regulated through an electric current signal, and the independent control of the flow of cooling liquid of the branch pipeline is realized. The branch circulating pipeline (7) adopts a micro-channel structure design, a plurality of convex flow guide ribs are arranged on the inner wall of the pipeline, and the flow guide ribs are distributed in a spiral shape. The application further comprises a liquid supplementing port (17) and an exhaust valve (16) installed at the top surface of the liquid storage tank (12), a liquid discharging pipeline (13) installed at the bottom surface of the liquid storage tank (12), and a valve arranged on the liquid discharging pipeline (13). The application further comprises a first transmission pipeline (15) communicated with one end of the main circulating pipeline (9) and the inlet of the liquid storage tank (12), a second transmission pipeline (19) communicated with the other end of the main circulating pipeline (9) and the outlet of the filtering box (18), and a third transmission pipeline (20) communicated with the outlet of the liquid storage tank (12) and the inlet of the filtering box (18). The application further comprises a mounting frame (1), the battery pack (2) is mounted at one end of the mounting frame (1), a fixing frame (14) sleeved on the outer wall of the liquid storage tank (12), a bottom plate (22) arranged on the bottom surface of the fixing frame (14), and the bottom plate (22) connected with the mounting frame (1) through bolts, and a bottom frame (21) arranged on the bottom surface of the filtering box (18) and connected with the mounting frame (1) through bolts. The first rectangular filter plate (181) adopts a 50-micron stainless steel filter screen, and the second rectangular filter plate (182) adopts a 10-micron high polymer filter screen. The application further comprises two groups of hoops (10) sleeved on the outer wall of the main circulating pipeline (9), two supports (11) arranged on the bottom surfaces of the two groups of hoops (10) and connected with the mounting frame (1) through bolts. The application further comprises a plurality of temperature sensors (4) attached to the surfaces of the corresponding battery cells (3).

2. The cooling liquid circulating device for a new energy vehicle battery pack according to claim 1, characterized in that: ​ 3. The cooling liquid circulating device for a new energy vehicle battery pack according to claim 1, characterized in that: ​ 4. The cooling liquid circulating device for a new energy vehicle battery pack according to claim 1, characterized in that: ​ ​ 5. The cooling liquid circulating device for a new energy vehicle battery pack according to claim 1, characterized in that: ​ ​ ​ 6. The cooling liquid circulating device for a new energy vehicle battery pack according to claim 1, characterized in that: ​ ​ ​ 7. The cooling liquid circulating device for a new energy vehicle battery pack according to claim 1, characterized in that: ​ 8. The cooling liquid circulating device for a new energy vehicle battery pack according to claim 1, characterized in that: ​ ​ 9. The cooling liquid circulating device for a new energy vehicle battery pack according to claim 1, characterized in that: ​

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