Liquid cooling energy storage battery pack

Abstract

The utility model provides a liquid-cooled energy storage battery pack which structurally comprises a battery module, a liquid-cooled chassis and an interlayer liquid-cooled plate which are used for cooling the battery module, a detachable bracket for connecting the liquid-cooled chassis and the interlayer liquid-cooled plate, and an upper cover connected with the liquid-cooled chassis, and a maintenance cover plate and a high-voltage panel are arranged on the upper cover. The utility model provides the battery pack which has a double-layer liquid cooling structure, is compact in supporting structure, high in bearing strength and convenient to disassemble and assemble, and all parts are easy to overhaul and maintain; the liquid cooling structure is simple and efficient, simultaneous heat dissipation of the upper-layer battery module and the lower-layer battery module is achieved through the three-way structure of the water inlet nozzle and the water outlet nozzle, the interlayer liquid cooling plate adopts U-shaped flow channels on the two sides, heat dissipation can be efficiently conducted on the middle module, the temperature of the middle module and the temperature of the modules on the two sides are balanced, the temperature difference is reduced, and the consistency of the module performance is improved; and the medium inlet and outlet structure of the interlayer liquid cooling plate is subjected to integrated design, so that the device has important significance on miniaturization and integration development of the battery pack.

Description

Technical Field

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

[0002] With the development of lithium battery energy storage technology, the market demand for industrial and commercial energy storage continues to increase, and the requirements for high energy density, lithium battery safety and thermal management continue to increase. In order to meet the miniaturization and thermal management requirements of industrial and commercial energy storage products, double-layer modules and liquid cooling have become research and development hotspots.

[0003] The current double-layer module structure is to design the bracket and the battery pack shell as an integrated structure. This solution will lead to the complexity of the battery pack shell structure, high mold opening costs, and poor later maintenance of the shell. Once damaged, it cannot be repaired.

[0004] The liquid cooling system uses a long serpentine liquid cooling channel at the bottom to dissipate heat, and the liquid cooling channel starts from the outermost side. However, under actual working conditions, the battery module often has a phenomenon of heat concentration, that is, the heat generated by the middle module is slightly higher than other parts. The use of a long serpentine channel will cause a large temperature difference between the middle module and the modules on both sides, thereby affecting the internal resistance of the battery cell, destroying the consistency of module performance, and ultimately affecting the overall performance of the battery pack. Utility Model Content

[0005] The purpose of the utility model is to provide a liquid-cooled energy storage battery pack to solve the problems in the above background.

[0006] The technical solution of the utility model includes: a liquid-cooled energy storage battery pack, which includes:

[0007] Battery module;

[0008] A liquid cooling chassis and a sandwich liquid cooling plate for cooling the battery module;

[0009] A detachable bracket for connecting the liquid cooling chassis and the interlayer liquid cooling plate;

[0010] And, an upper cover connected to the liquid cooling chassis, wherein the upper cover is provided with a maintenance cover plate and a high-voltage panel.

[0011] Preferably, the detachable bracket comprises:

[0012] Support plate A, the support plate A is distributed at the corner of the liquid cooling chassis, and the side of the support plate A close to the battery module is provided with wing plate 1 and wing plate 2, the wing plate 1 is parallel to the plate surface of the support plate A, and the wing plate 2 is perpendicular to the plate surface of the support plate A;

[0013] A support plate B is located between the support plates A. A wing plate three is provided on the side of the support plate B close to the battery module, and the wing plate three is parallel to the plate surface of the support plate B.

[0014] Preferably, the tops of the support plate A and the support plate B are each provided with a thread groove one, and the interlayer liquid cooling plate is provided with a screw hole one corresponding to the thread groove one.

[0015] Preferably, a connecting block 1 connected to the wing plate 1 and the wing plate 2 is provided at the bottom of the support plate A, and a screw hole 2 is provided on the connecting block 1; a connecting block 2 connected to the wing plate 3 is provided at the bottom of the support plate B, and a screw hole 3 is provided on the connecting block 2; and a threaded groove 2 corresponding to the screw hole 2 and the screw hole 3 is provided on the liquid cooling chassis.

[0016] Preferably, both the support plate A and the support plate B are provided with topological optimization grooves for weight reduction.

[0017] Preferably, the liquid cooling chassis is provided with a water inlet nozzle 1 and a water outlet nozzle 1, and the water inlet nozzle 1 and the water outlet nozzle 1 are both three-way structures, one end of which is connected to the liquid cooling chassis, and the other end is connected to the interlayer liquid cooling plate through a liquid cooling pipe.

[0018] Preferably, the interlayer liquid cooling plate comprises:

[0019] A plate body, one side of which is provided with a water inlet hole and a water outlet hole, the water inlet hole is provided in the middle thereof, and the water outlet hole is provided at the end thereof;

[0020] A second water inlet nozzle, the second water inlet nozzle corresponds to the position of the first water inlet nozzle and is connected to the water inlet hole through a water inlet manifold;

[0021] A second water outlet nozzle, the second water outlet nozzle corresponds to the position of the first water outlet nozzle and is connected to the water outlet hole through a water outlet manifold.

[0022] Preferably, the water inlet holes and the water outlet holes are respectively provided with two groups, the water inlet holes are arranged between the water outlet holes, and are connected to the water outlet holes through a U-shaped flow channel.

[0023] Preferably, the water inlet manifold is located on the top of the plate body, and its top surface is provided with an opening 1 connected to the water inlet nozzle 2, and its bottom surface is provided with an opening 2 connected to the water inlet hole.

[0024] Preferably, the water outlet manifold is located at the bottom of the plate body, and a third opening communicating with the water outlet is provided on the top surface thereof;

[0025] The second water outlet nozzle and the second water inlet nozzle are arranged on the same side of the plate body, and the water outlet hole connected to the second water outlet nozzle passes through the two sides of the plate body.

[0026] The beneficial effects of the utility model are: providing a battery pack with a double-layer liquid cooling structure, a compact supporting structure, high bearing strength, easy disassembly and assembly, and easy inspection and maintenance of various components; the liquid cooling structure is simple and efficient, and the simultaneous heat dissipation of the upper and lower battery modules is achieved through the three-way structure of the water inlet and outlet nozzles, and the sandwich liquid cooling plate adopts a double-sided U-shaped flow channel, which can efficiently dissipate the heat of the middle battery module, balance the temperature of the middle module and the modules on both sides, reduce the temperature difference, and improve the consistency of module performance; and the medium inlet and outlet structure of the sandwich liquid cooling plate is integrated to improve space utilization, which is of great significance to the miniaturization and integration of battery packs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural explosion diagram of an embodiment of the utility model;

[0028] Figure 2 This is a schematic diagram of the connection between the interlayer liquid cooling plate and the liquid cooling chassis in the embodiment of the utility model;

[0029] Figure 3 It is a schematic diagram of the connection between the detachable bracket and the liquid cooling chassis in the embodiment of the utility model;

[0030] Figure 4 It is a structural diagram of a detachable bracket in an embodiment of the utility model;

[0031] Figure 5 is a top view of the liquid cooling chassis in an embodiment of the utility model;

[0032] Figure 6 This is an exploded view of the structure of the sandwich liquid cooling plate in the embodiment of the utility model;

[0033] Figure 7 It is a two-side view of the plate body in the embodiment of the utility model;

[0034] Figure 8 It is a two-side view of the water inlet manifold in the embodiment of the utility model;

[0035] Fig. 9 It is a structural diagram of the water outlet manifold in the embodiment of the utility model.

[0036] In the figure:

[0037] 1. Battery module;

[0038] 2. Water inlet 1;

[0039] 3. Water outlet one;

[0040] 4. Interlayer liquid cooling plate; 4-1. Plate body; 4-11. Water inlet hole; 4-12. Water outlet hole; 4-13. U-shaped flow channel; 4-2. Water inlet nozzle 2; 4-3. Water outlet nozzle 2; 4-4. Screw hole 1;

[0041] 5. Removable bracket; 5-1. Support plate A; 5-11. Threaded groove 1; 5-12. Topological optimization groove; 5-2. Support plate B; 5-3. Wing plate 1; 5-4. Wing plate 2; 5-5. Connecting block 1; 5-51. Screw hole 2; 5-6. Wing plate 3; 5-7. Connecting block 2; 5-71. Screw hole 3;

[0042] 6. Liquid cooling chassis; 6-1. Thread groove 2;

[0043] 7. Water inlet manifold; 7-1. Opening 1; 7-2. Opening 2;

[0044] 8. Water outlet manifold; 8-1. Opening three;

[0045] 9. Upper cover;

[0046] 10. Repair cover;

[0047] 11. High voltage panel;

[0048] 12. BMS electronic components;

[0049] 13. Liquid cooling tube. DETAILED DESCRIPTION

[0050] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0051] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0053] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0054] Reference Figure 1-3 The present embodiment provides a liquid-cooled energy storage battery pack, which includes: a battery module 1, a sandwich liquid cooling plate 4, a detachable bracket 5, a liquid cooling chassis 6 and an upper cover 9. The upper cover 9 is detachably connected to the liquid cooling chassis 6 to form an inner cavity for accommodating the battery module 1, the sandwich liquid cooling plate 4 and the detachable bracket 5. The upper cover 9 is provided with a maintenance cover 10 and a high-voltage panel 11. The maintenance cover 10 shields the BMS electronic components 12 located inside the battery pack to facilitate maintenance. The high-voltage panel 11 is provided with positive and negative plugs of the battery pack; the sandwich liquid cooling plate 4 and the liquid cooling chassis 6 are connected through the detachable bracket 5, the battery module 1 is placed on the liquid cooling chassis 6 and the sandwich liquid cooling plate 4, and the liquid cooling chassis 6 and the sandwich liquid cooling plate 4 dissipate heat and cool the battery module 1.

[0055] Among them, the number of sandwich liquid cooling plates 4 can be set according to actual needs, and at least one is configured, that is, the battery pack provided in this embodiment has at least a double-layer battery module 1, which is placed on the liquid cooling chassis 6 and the sandwich liquid cooling plate 4 respectively. The detachable bracket 5 is used to connect the sandwich liquid cooling plate 4 and the liquid cooling chassis 6, and provide structural support for the sandwich liquid cooling plate 4 so that it can stably carry the battery module 1 located thereon. Through the above-mentioned split structural design and detachable connection method, the structure of the battery pack shell is simplified, the mold opening cost is reduced, and the convenience of later maintenance of the battery pack shell and internal structure is improved.

[0056] In order to improve the integration of the battery pack and ensure the support strength, and to improve the space utilization, this embodiment sets different detachable brackets 5 according to the distribution position, that is, the detachable bracket 5 is configured to include a support plate A5-1 and a support plate B5-2. Figure 3-6, support plate A5-1 is distributed at the four corners of the liquid cooling chassis 6, and support plate B5-2 is located between support plates A5-1, and is distributed at the four sides and the middle of the liquid cooling chassis 6. The tops of support plates A5-1 and support plates B5-2 are both provided with a thread groove 5-11, and the sandwich liquid cooling plate 4 is provided with a screw hole 4-4 corresponding to the thread groove 5-11, and the detachable bracket 5 is connected and fixed to the sandwich liquid cooling plate 4 by bolts installed downward from the top of the sandwich liquid cooling plate 4; the side of support plate A5-1 close to the battery module 1 is provided with a wing plate 1 5-3 and a wing plate 2 5-4, the wing plate 1 5-3 is parallel to the plate surface of support plate A5-1, and the wing plate 2 5-4 is perpendicular to the plate surface of support plate A5-1, and the bottom of support plate A5-1 is also provided with a connecting block connecting wing plate 1 5-3 and wing plate 2 5-4 A 5-5, a screw hole 2 5-51 is provided on the connecting block 1 5-5, a wing plate 3 5-6 is provided on the side of the support plate B5-2 close to the battery module 1, and the wing plate 3 5-6 is parallel to the plate surface of the support plate B5-2, and a connecting block 2 5-7 connecting the wing plate 3 5-6 is also provided at the bottom of the support plate B5-2, a screw hole 3 5-71 is provided on the connecting block 2 5-7, and a threaded groove 2 6-1 corresponding to the screw hole 2 5-51 and the screw hole 3 5-71 is provided on the liquid cooling chassis 6, and the detachable bracket 5 is connected and fixed to the liquid cooling chassis 6 by bolts installed downward from the connecting block 1 5-5 and the connecting block 2 5-7.

[0057] Wing plate 1 5-3, wing plate 2 5-4 and wing plate 3 5-6 can enhance the lateral rigidity of support plate A5-1 and support plate B5-2, improve the support stability of sandwich liquid cooling plate 4, and also protect the side of battery module 1. Wing plate 3 5-6 is parallel to the plate surface of support plate B5-2, which can effectively reduce the space waste inside the battery pack, improve the integration and space utilization, and is of great significance to the miniaturization development of battery packs.

[0058] In addition, topological optimization grooves 5-12 are provided on the support plate A5-1 and the support plate B5-2 to reduce the weight of the battery pack while ensuring the rigidity of the support plate A5-1 and the support plate B5-2. The shape and quantity of the topological optimization grooves 5-12 can be set according to actual needs, and can be distributed on one side or on both sides on the support plate A5-1 and the support plate B5-2, and no specific restrictions are made here.

[0059] When the battery pack is working normally, the heat is concentrated in the middle and the temperature is higher than that at the edge. If the heat dissipation structure is not configured properly, there will be a large temperature difference between the middle module and the modules on both sides, which will affect the internal resistance of the battery cell, destroy the consistency of module performance, and ultimately affect the overall performance of the battery pack. Therefore, in this embodiment, a double-sided U-shaped flow channel 4-13 is set on the interlayer liquid cooling plate 4, that is: two groups of water inlet holes 4-11 and two groups of water outlet holes 4-12 are arranged on the interlayer liquid cooling plate 4, the two groups of water inlet holes 4-11 are located in the middle of one side of the interlayer liquid cooling plate 4, and the two groups of water outlet holes 4-12 are respectively located on both sides of the water inlet hole 4-11, and are respectively connected to the water inlet holes 4-11 through the U-shaped flow channel 4-13. In this way, when the cold medium enters the interlayer liquid cooling plate 4 from the water inlet hole 4-11, it first passes through the middle of the interlayer liquid cooling plate 4 to cool down the middle battery module 1, and then flows through the U-shaped flow channel 4-13 to cool down the battery modules 1 on both sides, thereby balancing the temperature of the middle module and the modules on both sides after heat exchange, reducing the temperature difference, and improving the consistency of module performance.

[0060] When implementing, please refer to the attached Figure 6-9 A water inlet 2 and a water outlet 3 are arranged on the liquid cooling chassis 6, and the interlayer liquid cooling plate 4 is provided with a plate body 4-1, a water inlet 4-2 and a water outlet 4-3. The water inlet hole 4-11 and the water outlet hole 4-12 are located on the plate body 4-1. The water inlet 4-2 corresponds to the position of the water inlet 2 and is connected to the water inlet hole 4-11 through the water inlet collecting pipe 7. The water outlet 4-3 corresponds to the position of the water outlet 3 and is connected to the water outlet hole 4-12 through the water outlet collecting pipe 8. Both the water inlet 2 and the water outlet 3 are three-way structures, one end of which extends out of the battery pack, one end is connected to the liquid cooling chassis 6, and the other end is connected to the water inlet 4-2 or the water outlet 4-3 on the interlayer liquid cooling plate 4 through the liquid cooling pipe 13.

[0061] The above-mentioned water inlet nozzle 2 4-2 corresponds to the position of water inlet nozzle 1 2, the water outlet nozzle 2 4-3 corresponds to the position of water outlet nozzle 1 3, and the water inlet manifold 7 and the water outlet manifold 8 are provided, the purpose of which is to reduce the space waste of the water inlet and outlet accessories inside the battery pack and improve the integration and space utilization. Similarly, the water inlet nozzle 2 4-2 and the water outlet nozzle 2 4-3 can be arranged on the same side of the plate body 4-1, and the integration of the relevant accessories and the space utilization inside the battery pack can be improved by designing the position and shape of the water inlet manifold 7 and the water outlet manifold 8.

[0062] In some feasible embodiments, the water inlet nozzle 4-2 and the water outlet nozzle 4-3 are both arranged at the top of the plate body 4-1, and a water inlet hole 4-11 is set on the top surface of one side of the plate body 4-1, and a water outlet hole 4-12 is set on the side of the bottom surface of the side close to the water inlet nozzle 4-2, and a water outlet hole 4-12 that penetrates the top and bottom surfaces of the plate body 4-1 is set on the side of the side close to the water outlet nozzle 4-3; the water inlet collecting pipe 7 is arranged at the top of the plate body 4-1, and an opening 7-1 is set on the top surface of one end thereof to connect with the water inlet nozzle 4-2, and two openings 7-2 are set on the bottom surface of the other end to respectively connect the two water inlet holes 4-11; the water outlet collecting pipe 8 is arranged at the bottom of the plate body 4-1, and openings 8-1 are set on the top surfaces of both ends thereof to respectively connect the two water outlet holes 4-12.

[0063] Compared with the prior art, the beneficial effects of the utility model are: providing a battery pack with a double-layer liquid cooling structure, a compact supporting structure, high bearing strength, easy disassembly and assembly, and easy inspection and maintenance of various components; the liquid cooling structure is simple and efficient, and the simultaneous heat dissipation of the upper and lower layers of battery modules 1 is achieved through the three-way structure of the inlet and outlet nozzles, and the interlayer liquid cooling plate 4 adopts a double-sided U-shaped flow channel 4-13, which can efficiently dissipate the heat of the middle battery module 1, balance the temperature of the middle module and the modules on both sides, reduce the temperature difference, and improve the consistency of module performance; and the medium inlet and outlet structure of the interlayer liquid cooling plate 4 is integrated to improve space utilization, which is of great significance to the miniaturization and integration of battery packs.

[0064] The above are preferred implementations of the present utility model. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present utility model. These improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A liquid-cooled energy storage battery pack, characterized in that: include: Battery module; A liquid cooling chassis and a sandwich liquid cooling plate for cooling the battery module; A detachable bracket for connecting the liquid cooling chassis and the interlayer liquid cooling plate; And, an upper cover connected to the liquid cooling chassis, wherein the upper cover is provided with a maintenance cover plate and a high-voltage panel.

2. The liquid-cooled energy storage battery pack according to claim 1, characterized in that: The detachable bracket comprises: Support plate A, the support plate A is distributed at the corner of the liquid cooling chassis, and the side of the support plate A close to the battery module is provided with wing plate 1 and wing plate 2, the wing plate 1 is parallel to the plate surface of the support plate A, and the wing plate 2 is perpendicular to the plate surface of the support plate A; A support plate B is located between the support plates A. A wing plate three is provided on the side of the support plate B close to the battery module, and the wing plate three is parallel to the plate surface of the support plate B.

3. The liquid-cooled energy storage battery pack according to claim 2, characterized in that: The tops of the support plate A and the support plate B are both provided with a thread groove 1, and the interlayer liquid cooling plate is provided with a screw hole 1 corresponding to the thread groove 1.

4. The liquid-cooled energy storage battery pack according to claim 2, characterized in that: A connecting block 1 connected to the wing plate 1 and the wing plate 2 is provided at the bottom of the support plate A, and a screw hole 2 is provided on the connecting block 1; a connecting block 2 connected to the wing plate 3 is provided at the bottom of the support plate B, and a screw hole 3 is provided on the connecting block 2; a threaded groove 2 corresponding to the screw hole 2 and the screw hole 3 is provided on the liquid cooling chassis.

5. The liquid-cooled energy storage battery pack according to claim 2, characterized in that: The support plate A and the support plate B are both provided with topological optimization grooves for reducing weight.

6. The liquid-cooled energy storage battery pack according to any one of claims 1 to 5, characterized in that: The liquid cooling chassis is provided with a water inlet nozzle 1 and a water outlet nozzle 1, and both the water inlet nozzle 1 and the water outlet nozzle 1 are three-way structures, one end of which is connected to the liquid cooling chassis, and the other end is connected to the interlayer liquid cooling plate through a liquid cooling pipe.

7. The liquid-cooled energy storage battery pack according to claim 6, characterized in that: The interlayer liquid cooling plate comprises: A plate body, one side of which is provided with a water inlet hole and a water outlet hole, the water inlet hole is provided in the middle thereof, and the water outlet hole is provided at the end thereof; A second water inlet nozzle, the second water inlet nozzle corresponds to the position of the first water inlet nozzle and is connected to the water inlet hole through a water inlet manifold; A second water outlet nozzle, the second water outlet nozzle corresponds to the position of the first water outlet nozzle and is connected to the water outlet hole through a water outlet manifold.

8. The liquid-cooled energy storage battery pack according to claim 7, characterized in that: The water inlet holes and the water outlet holes are respectively provided with two groups, the water inlet holes are arranged between the water outlet holes, and are connected to the water outlet holes through a U-shaped flow channel.

9. The liquid-cooled energy storage battery pack according to claim 7 or 8, characterized in that: The water inlet manifold is located at the top of the plate body, and the top surface thereof is provided with an opening 1 connected to the water inlet nozzle 2, and the bottom surface thereof is provided with an opening 2 connected to the water inlet hole.

10. The liquid-cooled energy storage battery pack according to claim 9, characterized in that: The water outlet manifold is located at the bottom of the plate body, and a third opening communicating with the water outlet is provided on the top surface of the water outlet manifold; The second water outlet nozzle and the second water inlet nozzle are arranged on the same side of the plate body, and the water outlet hole connected to the second water outlet nozzle passes through the two sides of the plate body.

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