Distributed battery thermal management system

Abstract

The utility model provides a distributed battery thermal management system, and relates to the technical field of batteries, a first thermal management loop comprises a BTMS, a water inlet header pipe, a first water inlet distribution pipe, a water inlet manifold, a first battery assembly, a water return manifold, a first water return distribution pipe and a water return header pipe which are communicated in sequence; the second heat management loop comprises a BTMS, a water inlet main pipe, a second water inlet distribution pipe, a second battery assembly, a second water return distribution pipe and a water return main pipe which are communicated in sequence; the water inlet header pipe is provided with three pipelines which are respectively connected with the BTMS, the first water inlet distribution pipe and the second water inlet distribution pipe; and the water return main pipe is provided with three pipelines which are respectively connected with the BTMS, the first water return distribution pipe and the second water return distribution pipe. The distributed battery thermal management system is suitable for a distributed power battery pack, and through reasonable pipeline design, only one battery thermal management system is adopted in a distributed battery arrangement power battery system to achieve thermal management of distributed batteries.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a distributed battery thermal management system. Background Art

[0002] Bulldozers are a type of engineering machinery with a wide range of applications. With the development trend of the engineering machinery industry, pure electric bulldozers have gradually become the new favorite in the market. The power battery carried by pure electric bulldozers is the power source of the entire vehicle. The number of batteries carried directly affects the endurance and market performance of the equipment.

[0003] The first generation of pure electric bulldozers are generally equipped with 8 power battery boxes, but under harsh working conditions (such as continuous high load and high energy consumption), the endurance of 8 power battery boxes cannot meet the work requirements. In the case that the energy density of power batteries is difficult to make a qualitative leap, in order to improve the endurance of pure electric bulldozers, it is necessary to carry more power battery boxes within the given layout space conditions of the bulldozer. Therefore, considering the distributed layout of batteries has become an effective method. Distributing batteries in various parts of the bulldozer can not only improve the endurance without changing the shape of the pure electric bulldozer (such as affecting the working field), but also help improve the overall performance and efficiency of the equipment.

[0004] The installation of a power battery box requires a corresponding thermal management system to cool the battery to prevent overcharging, over-discharging and overheating. The traditional power battery layout method usually arranges the power batteries in one place and only sets up a battery thermal management system (BTMS) to realize the thermal management function of the battery. However, when the batteries are distributed, one battery assembly is equipped with one BTMS, and multiple BTMS need to be installed to realize the thermal management function of the battery. Installing multiple BTMS not only greatly increases the cost, but also increases the size of the power battery box.

[0005] The above are the shortcomings of the prior art. Utility Model Content

[0006] In view of the shortcomings of the prior art, the utility model provides a distributed battery thermal management system, which is suitable for distributed power battery packs. Through reasonable pipeline design, only one battery thermal management system is used in the power battery system with distributed battery arrangement to achieve thermal management of distributed batteries.

[0007] The utility model provides a distributed battery thermal management system, including a first thermal management loop and a second thermal management loop;

[0008] The first thermal management loop includes a BTMS, a water inlet main pipe, a first water inlet distribution pipe, a water inlet manifold, a first battery assembly, a return water manifold, a first return water distribution pipe and a return water main pipe which are connected in sequence;

[0009] The second thermal management circuit includes a BTMS, a water inlet main pipe, a second water inlet distribution pipe, a second battery assembly, a second water return distribution pipe and a water return main pipe which are connected in sequence;

[0010] The water inlet main is provided with three pipelines, which are respectively connected to the BTMS, the first water inlet distribution pipe and the second water inlet distribution pipe;

[0011] The return water main is provided with three pipelines, which are respectively connected to the BTMS, the first return water distribution pipe and the second return water distribution pipe.

[0012] This technical solution achieves thermal management of two power battery assemblies by reasonably setting a three-way water inlet main pipe and a water return main pipe and using one BTMS for thermal management of two circulation loops, thereby saving both cost and space.

[0013] Further, the water inlet main pipe is provided with a first pipeline, a second pipeline and a third pipeline;

[0014] The first pipeline is a thick pipeline connected to the BTMS water outlet, the second pipeline is a thick pipeline connected to the first return water distribution pipe, and the third pipeline is a thin pipeline connected to the second inlet water distribution pipe;

[0015] The third pipeline is arranged on the second pipeline, and a throttle plate is arranged on the third pipeline.

[0016] Further, the return water main is provided with a fourth pipeline, a fifth pipeline and a sixth pipeline;

[0017] The fourth pipeline is a thick pipeline connected to the BTMS water inlet, the fifth pipeline is a thick pipeline connected to the first return water distribution pipe, and the sixth pipeline is a thin pipeline connected to the second return water distribution pipe.

[0018] This technical solution achieves reasonable distribution of the coolant flow in the battery thermal management system by setting different throttle plates and pipe thicknesses, thereby improving the operating efficiency of the battery thermal management system.

[0019] Furthermore, the first thermal management circuit is further provided with a first expansion water tank, and the second thermal management circuit is further provided with a second expansion water tank;

[0020] The water inlet and the water outlet of the first expansion water tank are both connected to the first water inlet distribution pipe, and the first expansion water tank is arranged at the highest point of the first water inlet distribution pipe;

[0021] The water inlet of the second expansion water tank is connected to the second water inlet distribution pipe, the water outlet of the second expansion water tank is connected to the return water main pipe, and the second expansion water tank is arranged at the highest point of the second water inlet distribution pipe.

[0022] In the technical solution, by providing the first expansion water tank and the second expansion water tank, the internal gas in the circulation loop can be effectively removed, the internal pressure of the power battery assembly is reduced, and the safety and service life of the power battery are improved.

[0023] Furthermore, the return water main is provided with a seventh pipeline, which is a thin pipeline connected to the water outlet of the second expansion water tank.

[0024] Furthermore, the first thermal management loop and the second thermal management loop share a BTMS, a water inlet main pipe and a water return main pipe.

[0025] Furthermore, the water inlet manifold includes a water inlet main pipe and four water inlet branch pipes, and the water return manifold includes a water return main pipe and four water return branch pipes.

[0026] Further, the first battery assembly includes a power battery, and the second battery assembly includes a power battery;

[0027] Every two power batteries form a power battery pack, and each power battery pack is provided with a cooling water plate.

[0028] Furthermore, in the first thermal management loop, the water inlet branch pipe is connected to the water inlet of the cooling water plate of the power battery pack, and the water return branch pipe is connected to the water outlet of the cooling water plate of the power battery pack.

[0029] It can be seen from the above technical solutions that the utility model has the following advantages:

[0030] The utility model realizes thermal management of two power battery assemblies by setting up a design of applying one BTMS to two circulation loops, thereby effectively reducing the temperature of the power battery assembly, improving the application safety of the power battery assembly, and extending the service life of the power battery, so that the entire battery thermal management system can operate efficiently under limited resources, thereby improving the performance of the entire electric vehicle bulldozer. Moreover, through the BTMS one-to-two mode, not only the installation cost of the BTMS is reduced and the installation space is saved, but also the control of the BTMS in the electric vehicle bulldozer is simplified.

[0031] The utility model realizes reasonable distribution of the coolant flow in the battery thermal management system by arranging throttling plates and different thicknesses of the water inlet main pipe and the water return main pipe, thereby improving the operating efficiency of the battery thermal management system.

[0032] Moreover, the utility model can effectively remove the internal gas in the circulation loop by installing an expansion water tank in the circulation loop, thereby reducing the internal pressure of the power battery assembly, improving the safety and service life of the power battery, and ensuring the stable operation of the battery thermal management system while the battery thermal management system operates efficiently, reducing the risk of failure.

[0033] In addition, the utility model has a reliable design principle, a simple structure and a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solution of the utility model, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 This is a schematic diagram of the structure of the battery thermal management system of the utility model;

[0036] Figure 2 This is a schematic diagram of the structure of the water inlet main pipe in the battery thermal management system of the utility model;

[0037] Figure 3 It is a structural schematic diagram of the water return main pipe in the battery thermal management system of the utility model.

[0038] Among them, 1. BTMS, 2. water inlet main pipe, 3. water return main pipe, 4. first water inlet distribution pipe, 5. water inlet manifold, 6. first battery assembly, 7. water return manifold, 8. first water return distribution pipe, 9. second water inlet distribution pipe, 10. second battery assembly, 11. second water return distribution pipe, 12. first expansion water tank, 13. second expansion water tank, 14. throttle plate, 201. first pipeline, 202. second pipeline, 203. third pipeline, 301. fourth pipeline, 302. fifth pipeline, 303. sixth pipeline, 304. seventh pipeline. DETAILED DESCRIPTION

[0039] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme of the utility model will be clearly and completely described below in combination with the drawings in the specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0040] like Figure 1 As shown, the utility model provides a distributed battery thermal management system, including a first thermal management loop and a second thermal management loop.

[0041] The first thermal management loop includes a BTMS1, a water inlet main pipe 2, a first water inlet distribution pipe 4, a water inlet manifold 5, a first battery assembly 6, a return water manifold 7, a first return water distribution pipe 8 and a return water main pipe 3 which are connected in sequence.

[0042] The second thermal management circuit includes a BTMS1, a water inlet main pipe 2, a second water inlet distribution pipe 9, a second battery assembly 10, a second water return distribution pipe 11 and a water return main pipe 3 which are connected in sequence.

[0043] Among them, BTMS1 (Battery Thermal Management System) is a battery thermal management system designed for the thermal management needs of electric vehicle battery packs. Its main purpose is to keep the temperature of the battery pack stable during operation to improve the performance, safety and service life of the battery pack.

[0044] The first thermal management loop and the second thermal management loop share a BTMS1, a water inlet main pipe 2 and a water return main pipe 3. The first thermal management loop and the second thermal management loop share a BTMS1. On the basis of two distributed power battery assemblies, only one BTMS1 is used to achieve thermal management of the battery, and the installation cost of the BTMS1 is reduced, the installation space is saved, and the control of the BTMS1 in the electric vehicle bulldozer is simplified.

[0045] like Figure 2 As shown, the water inlet main pipe 2 is provided with a first pipeline 201, a second pipeline 202 and a third pipeline 203. Among them, the first pipeline 201 is a thick pipeline connected to the water outlet of BTMS, 1; the second pipeline 202 is a thick pipeline connected to the first return water distribution pipe 8; the third pipeline 203 is a thin pipeline connected to the second water inlet distribution pipe 9, and the third pipeline 203 is arranged on the second pipeline 202, and the third pipeline 203 is provided with a throttle plate 14.

[0046] The throttle plate 14 can adjust the flow rate of the coolant entering the third pipeline 203 by the resistance effect on the fluid, ensuring that the coolant flow rate in the second circulation loop is within a suitable range to meet the cooling requirements of the first circulation loop and the second circulation loop.

[0047] like Figure 3 As shown, the return water main pipe 3 is provided with a fourth pipeline 301, a fifth pipeline 302, a sixth pipeline 303 and a seventh pipeline 304. Among them, the fourth pipeline 301 is a thick pipeline connected to the water inlet of BTMS1; the fifth pipeline 302 is a thick pipeline connected to the first return water distribution pipe 8; the sixth pipeline 303 is a thin pipeline connected to the second return water distribution pipe 11; the seventh pipeline 304 is a thin pipeline connected to the water outlet of the second expansion water tank 13.

[0048] The design of different pipe thicknesses in the water inlet main pipe 2 and the water return main pipe 3 can realize the control of the coolant flow in the battery thermal management system, and by setting the throttle plate, the coolant flow in the battery thermal management system can be reasonably distributed to improve the operating efficiency of the battery thermal management system. In addition, setting pipes of different thicknesses can form different pressure gradients in the battery thermal management system, which helps to achieve pressure balance and prevent battery thermal management system failures caused by excessively high or low pressure.

[0049] The first thermal management circuit is also provided with a first expansion water tank 12, and the second thermal management circuit is also provided with a second expansion water tank 13. The water inlet and the water outlet of the first expansion water tank 12 are both connected to the first water inlet distribution pipe 4, and the first expansion water tank 12 is arranged at the highest point of the first water inlet distribution pipe 4. The water inlet of the second expansion water tank 13 is connected to the second water inlet distribution pipe 9, and the water outlet of the second expansion water tank 13 is connected to the return water main pipe 3, and the second expansion water tank 13 is arranged at the highest point of the second water inlet distribution pipe 9.

[0050] In this embodiment, the function of the expansion tank is to discharge the air in the circulation loop to maintain the normal operation of the thermal management system and the smooth water circulation. The expansion tank is generally made of steel plate, usually round or rectangular, and is generally set at the highest point of the system.

[0051] In the first thermal management loop, the water inlet manifold 5 includes a water inlet main pipe and four water inlet branch pipes, and the water return manifold 7 includes a water return main pipe and four water return branch pipes.

[0052] The first battery assembly 6 includes 8 power batteries, and the second battery assembly 10 includes 2 power batteries. Every two power batteries form a power battery pack, and a cooling water plate is provided on each power battery pack. In the first thermal management loop, the water inlet branch pipe is connected to the water inlet of the cooling water plate of the power battery pack, and the water return branch pipe is connected to the water outlet of the cooling water plate of the power battery pack.

[0053] The working process of the battery thermal management system is as follows:

[0054] The coolant flows from the water outlet of BTMS1 into the water inlet main pipe 2 through the first pipeline 201, and then flows into the first water inlet distribution pipe 4 and the second water inlet distribution pipe 9 through the second pipeline 202 and the third pipeline 203 respectively.

[0055] After the coolant enters the first water inlet distribution pipe 4, it flows into the first expansion water tank 12 through the water inlet of the first expansion water tank 12, and then flows out through the water outlet of the first expansion water tank 12 and flows into the water inlet main pipe of the water inlet manifold 5 together with the coolant in the first water inlet distribution pipe 4, and flows into the cooling water plates of the four power battery groups of the first battery assembly 6 through the water inlet branch pipes. After the coolant undergoes heat exchange inside the first battery assembly 6, it flows into the return water main pipe of the return manifold 7 through the return water branch pipe, and then flows into the first return water distribution pipe 8, flows into the return water main pipe 3 through the fifth pipe 302, and then flows into the water inlet of BTMS1 through the fourth pipe 301, and flows into BTMS1 for heat exchange, completing the coolant circulation of the first circulation loop.

[0056] After the coolant enters the second water inlet distribution pipe 9, a part of the coolant flows into the second expansion water tank 13 through the water inlet of the second expansion water tank 13, and then flows out through the water outlet of the second expansion water tank 13, and flows into the return water main pipe 3 through the seventh pipeline 304; the other part of the coolant flows from the second water inlet distribution pipe 9 into the cooling water plate of the power battery group of the second battery assembly 10. After the coolant undergoes heat exchange inside the second battery assembly 10, it flows into the first return water distribution pipe 11 through the water outlet of the cooling water plate group, and then flows into the return water main pipe 3 through the sixth pipeline 303, and flows into the water inlet of BTMS1 through the fourth pipeline 301, and flows into BTMS1 for heat exchange, completing the coolant circulation of the second circulation loop.

[0057] The utility model realizes thermal management of two power battery assemblies by setting up a design of applying one BTMS to two circulation loops, thereby effectively reducing the temperature of the power battery assembly, improving the application safety of the power battery assembly, and extending the service life of the power battery, so that the entire battery thermal management system can operate efficiently under limited resources, thereby improving the performance of the entire electric vehicle bulldozer. Moreover, through the BTMS one-to-two mode, not only the installation cost of the BTMS is reduced and the installation space is saved, but also the control of the BTMS in the electric vehicle bulldozer is simplified.

[0058] The utility model realizes reasonable distribution of the coolant flow in the battery thermal management system by arranging throttling plates and different thicknesses of the water inlet main pipe and the water return main pipe, thereby improving the operating efficiency of the battery thermal management system.

[0059] Moreover, the utility model can effectively remove the internal gas in the circulation loop by installing an expansion water tank in the circulation loop, thereby reducing the internal pressure of the power battery assembly, improving the safety and service life of the power battery, and ensuring the stable operation of the battery thermal management system while the battery thermal management system operates efficiently, reducing the risk of failure.

[0060] In addition, the utility model has a reliable design principle, a simple structure and a very broad application prospect.

[0061] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those 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 will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A distributed battery thermal management system, characterized in that: including a first thermal management loop and a second thermal management loop; The first thermal management loop comprises a BTMS (1), a water inlet main pipe (2), a first water inlet distribution pipe (4), a water inlet manifold (5), a first battery assembly (6), a water return manifold (7), a first water return distribution pipe (8) and a water return main pipe (3) which are connected in sequence; The second thermal management circuit comprises a BTMS (1), a water inlet main pipe (2), a second water inlet distribution pipe (9), a second battery assembly (10), a second water return distribution pipe (11) and a water return main pipe (3) which are connected in sequence; The water inlet main pipe (2) is provided with three pipelines, which are respectively connected to the BTMS (1), the first water inlet distribution pipe (4) and the second water inlet distribution pipe (9); The return water main pipe (3) is provided with three pipelines, which are respectively connected to the BTMS (1), the first return water distribution pipe (8) and the second return water distribution pipe (11).

2. The distributed battery thermal management system according to claim 1, characterized in that: The water inlet main pipe (2) is provided with a first pipeline (201), a second pipeline (202) and a third pipeline (203); The first pipeline (201) is a thick pipeline connected to the water outlet of the BTMS (1), the second pipeline (202) is a thick pipeline connected to the first return water distribution pipe (8), and the third pipeline (203) is a thin pipeline connected to the second inlet water distribution pipe (9); The third pipeline (203) is arranged on the second pipeline (202), and a throttling plate (14) is arranged on the third pipeline (203).

3. The distributed battery thermal management system according to claim 1, characterized in that: The return water main pipe (3) is provided with a fourth pipeline (301), a fifth pipeline (302) and a sixth pipeline (303); The fourth pipeline (301) is a thick pipeline connected to the water inlet of the BTMS (1), the fifth pipeline (302) is a thick pipeline connected to the first return water distribution pipe (8), and the sixth pipeline (303) is a thin pipeline connected to the second return water distribution pipe (11).

4. The distributed battery thermal management system according to claim 1, characterized in that: The first thermal management circuit is further provided with a first expansion water tank (12), and the second thermal management circuit is further provided with a second expansion water tank (13); The water inlet and the water outlet of the first expansion water tank (12) are both connected to the first water inlet distribution pipe (4), and the first expansion water tank (12) is arranged at the highest point of the first water inlet distribution pipe (4); The water inlet of the second expansion water tank (13) is connected to the second water inlet distribution pipe (9), the water outlet of the second expansion water tank (13) is connected to the return water main pipe (3), and the second expansion water tank (13) is arranged at the highest point of the second water inlet distribution pipe (9).

5. The distributed battery thermal management system according to claim 1, characterized in that: The return water main pipe (3) is provided with a seventh pipeline (304), and the seventh pipeline (304) is a thin pipeline connected to the water outlet of the second expansion water tank (13).

6. The distributed battery thermal management system according to claim 1, characterized in that: The first thermal management loop and the second thermal management loop share a BTMS (1), a water inlet main pipe (2) and a water return main pipe (3).

7. The distributed battery thermal management system according to claim 1, characterized in that: The water inlet manifold (5) comprises a water inlet main pipe and four water inlet branch pipes, and the water return manifold (7) comprises a water return main pipe and four water return branch pipes.

8. The distributed battery thermal management system according to claim 1, characterized in that: The first battery assembly (6) includes 8 power batteries, and the second battery assembly (10) includes 2 power batteries; Every two power batteries form a power battery pack, and each power battery pack is provided with a cooling water plate.

9. The distributed battery thermal management system according to claim 7 or 8, characterized in that: In the first thermal management loop, the water inlet branch pipe is connected to the water inlet of the cooling water plate of the power battery pack, and the water return branch pipe is connected to the water outlet of the cooling water plate of the power battery pack.

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