Double-sided cooling battery pack

Abstract

The utility model relates to the technical field of energy storage batteries, in particular to a double-sided cooling battery pack which comprises a battery box body, a liquid cooling bottom plate and a liquid cooling top plate, and an interface heat conduction device is arranged between a battery module and the liquid cooling top plate. The liquid cooling bottom plate and the liquid cooling top plate are arranged at the bottom end and the top end of the battery pack respectively, and meanwhile heat generated by the battery pack and the battery modules arranged in the battery pack is cooled and exchanged in time; meanwhile, the interface heat conduction device is arranged between the liquid cooling top plate and the battery module, the structural design is ingenious, and a heat conduction channel can be established between the battery module and the liquid cooling top plate to form a structure with relatively low contact thermal resistance, so that heat conduction is formed between the battery cell and the liquid cooling top plate, and the heat dissipation effect of the top and the side part of the battery cell is improved; the multi-surface efficient cooling of the battery cell is realized, the temperature of the battery cell body is controlled within a proper temperature range, the large temperature difference generated at the top end and the bottom end of the battery cell body is avoided, the operation stability of the battery pack is improved, and the service life of the battery pack is prolonged.

Description

Technical Field

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

[0002] Now more and more energy storage systems tend to use liquid cooling to cool and dissipate heat from batteries, mainly because of the efficient cooling capacity of liquid cooling, which can control the temperature of the battery cell within the required range in a relatively short time. Most of the current liquid-cooled battery packs use a single cooling solution with a bottom liquid cooling plate, that is, the battery cell is made into a module and placed directly on the liquid cooling plate to achieve heat exchange, but there is no cooling setting on the side and top of the battery pack, which will cause the battery cell to be cool at the bottom and hot at the top. And data shows that the temperature difference between the bottom and the top of the 280Ah battery cell commonly used in energy storage can be as high as 10°C under the rated working condition of 0.5P. The large temperature gradient in the battery cell body will cause the material at the bottom of the battery cell to be weakly active and the top to be highly active, which will damage the service life of the battery cell. Therefore, based on the above problems, the existing technology needs to be further improved. Utility Model Content

[0003] The purpose of the utility model is to provide a double-sided cooling battery pack to solve the prior art problems existing in the above-mentioned background technology.

[0004] In order to solve the above-mentioned technical problems, the technical solution provided by the utility model is as follows: a double-sided cooled battery pack is provided, comprising a battery case, a liquid-cooled bottom plate and a liquid-cooled top plate, wherein a plurality of battery modules are arranged in the battery case, the liquid-cooled bottom plate is arranged at the bottom end of the battery case, the liquid-cooled top plate is arranged at the top end of the battery case, cooling liquid circulates in both the liquid-cooled bottom plate and the liquid-cooled top plate, and an interface heat conduction device is arranged between the battery module and the liquid-cooled top plate for extracting heat from the top and sides of the battery module.

[0005] Based on the above technical solution, the interface heat conduction device includes a heat conduction frame, a first heat conduction pad and an elastic component. The heat conduction frame is buckled on the battery module, the first heat conduction pad is arranged between the top of the heat conduction frame and the liquid cooling top plate, and the elastic component is arranged between the bottom of the heat conduction frame and the battery module.

[0006] Based on the above technical solution, the heat-conducting frame includes a heat-conducting top plate and heat-conducting side plates, the heat-conducting side plates are symmetrically arranged on both sides of the heat-conducting top plate, and a second heat-conducting pad is arranged between the heat-conducting side plates and the battery module.

[0007] On the basis of the above technical solution, heat absorbing fins are arranged on the inner side wall of the heat-conducting top plate, and a flange structure is arranged at the end of the heat-conducting side plate away from the heat-conducting top plate.

[0008] Based on the above technical solution, the elastic component is configured as highly elastic silicone rubber, a spring or a spring sheet.

[0009] Based on the above technical solution, the battery module includes battery cells, end plates and a bundling assembly. The battery cells are arranged in multiple numbers evenly, and the end plates are symmetrically arranged on the outside of the battery cells and fixed by the bundling assembly.

[0010] Based on the above technical solution, the liquid-cooled bottom plate is provided with a first cooling liquid inlet and a first cooling liquid outlet, and the liquid-cooled top plate is provided with a second cooling liquid inlet and a second cooling liquid outlet.

[0011] Based on the above technical solution, the first thermal pad and the second thermal pad are made of thermal grease or thermal silica gel.

[0012] Based on the above technical solution, the liquid-cooled bottom plate and the liquid-cooled top plate are made of stamped aluminum profiles, and the battery box is made of Q235A steel.

[0013] The beneficial effects of the technical solution provided by the utility model are:

[0014] 1. The utility model provides a double-sided cooling battery pack, which has good cooling effect by arranging a liquid-cooled bottom plate and a liquid-cooled top plate at the bottom and top of the battery pack respectively, so as to timely cool and exchange the heat generated by the battery pack and the battery modules arranged inside; at the same time, an interface heat conduction device is arranged between the liquid-cooled top plate and the battery module, which is used to timely conduct the heat from the top and sides of the battery module, and cooperate with the liquid-cooled top plate for cooling, so as to realize multi-sided and efficient cooling of the battery cell, control the temperature of the battery cell body within a suitable temperature range, avoid the large temperature difference between the top and bottom of the battery cell body, and improve the operating stability and service life of the battery pack.

[0015] 2. By setting up an interface heat conduction device and ingenious structural design, a heat conduction channel can be established between the battery module and the liquid-cooled top plate through the cooperation of the heat conduction frame, multi-directional heat conduction pad and elastic components, forming a structure with low contact thermal resistance, thereby forming heat conduction between the battery cell and the liquid-cooled top plate, and improving the heat dissipation effect of the top and sides of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is the front view of the utility model;

[0018] Figure 3 It is a schematic diagram of the structure of the utility model after removing the liquid cooling top plate;

[0019] Figure 4It is a three-dimensional structural schematic diagram of the battery module and the interface heat conduction device in the utility model;

[0020] Figure 5 It is a side view of the battery module and the interface heat conduction device in the utility model;

[0021] Figure 6 It is a structural schematic diagram of the heat conduction frame in the utility model; DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the description of the present invention, it should be understood that the terms "left", "right", "front", "back", "top", "bottom", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0025] like Figures 1 to 6 As shown, a double-sided cooled battery pack includes a battery case 1, a liquid-cooled bottom plate 2 and a liquid-cooled top plate 3, wherein a plurality of battery modules 4 are arranged in the battery case 1, the liquid-cooled bottom plate 2 is arranged at the bottom end of the battery case 1, and the liquid-cooled top plate 3 is arranged at the top end of the battery case 1, and coolant circulates in both the liquid-cooled bottom plate 2 and the liquid-cooled top plate 3, and an interface heat conduction device 5 is arranged between the battery module 4 and the liquid-cooled top plate 3 for extracting heat from the top and sides of the battery module 4.

[0026] The utility model provides a double-sided cooled battery pack, which has good cooling effect by arranging a liquid-cooled bottom plate 2 and a liquid-cooled top plate 3 at the bottom and top of the battery pack respectively, so as to timely cool and exchange heat generated by the battery pack and the battery module 4 arranged inside; at the same time, an interface heat conduction device 5 is arranged between the liquid-cooled top plate 3 and the battery module 4, which is used to timely conduct heat from the top and side of the battery module 4, and cooperate with the liquid-cooled top plate 3 for cooling, so as to realize multi-sided and efficient cooling of the battery cell, control the temperature of the battery cell body within a suitable temperature range, avoid the large temperature difference between the top and bottom of the battery cell body, and improve the operating stability and service life of the battery pack.

[0027] Specifically, the liquid cooling bottom plate 2 provides cooling for the bottom of the battery cell, the liquid cooling top plate 3 provides cooling for the top of the battery cell, and the battery box 1 provides support and connection between the liquid cooling bottom plate and the liquid cooling top plate, that is, the liquid cooling bottom plate 2 and the liquid cooling top plate 3 achieve efficient cooling effect on both sides for the battery module 4 in the battery box; the interface heat conduction device 5 can build a heat transfer bridge between the battery module 4 and the liquid cooling top plate 3, build a heat conduction interface, solve the problem of difficult cooling of the top and side of the battery cell body, achieve efficient heat transfer, and facilitate assembly. In a more preferred embodiment, the liquid cooling bottom plate and the box can be an integrated structure.

[0028] Based on the above technical solution, the interface heat conduction device 5 includes a heat conduction frame 51, a first heat conduction pad 52 and an elastic component 53. The heat conduction frame 51 is buckled on the battery module 4, the first heat conduction pad 52 is arranged between the top of the heat conduction frame 51 and the liquid cooling top plate 3, and the elastic component 53 is arranged between the bottom of the heat conduction frame 51 and the battery module 4.

[0029] By providing an interface heat conduction device 5 with an ingenious structural design, a heat conduction channel can be established between the battery module 4 and the liquid-cooled top plate 3 through the cooperation of the heat conduction frame, the multi-directional heat conduction pad and the elastic component, forming a structure with low contact thermal resistance, thereby forming heat conduction between the battery cell and the liquid-cooled top plate, improving the heat dissipation effect of the top and sides of the battery cell, reducing the temperature difference between the bottom and top of the battery cell body, reducing damage to the battery cell body, and improving the service life of the battery pack.

[0030] In this embodiment, the heat-conducting frame 51 is made of 6061 series aluminum profiles; in other preferred embodiments, it can also be made of materials with high thermal conductivity such as titanium plates, magnesium-aluminum alloy sheets, etc. Specifically, the heat-conducting frame 51 is buckled on the battery module 4, and can contact the top and side of the battery module 4, timely guide the heat generated at the corresponding position, and achieve heat exchange cooling through the liquid-cooled top plate 3; the first thermal pad 52 can achieve good contact between the heat-conducting frame 51 and the liquid-cooled top plate 3, and establish a lower contact thermal resistance; the elastic component 53 mainly plays a buffering role. Under the pressure of the deadweight of the liquid-cooled top plate 3 on the heat-conducting frame 51, the heat-conducting frame 51 can be in good contact with the liquid-cooled top plate 3 through its rebound force, and a lower contact thermal resistance can be established to achieve efficient heat conduction.

[0031] Based on the above technical solution, the heat-conducting frame 51 includes a heat-conducting top plate 511 and a heat-conducting side plate 512 . The heat-conducting side plates 512 are symmetrically arranged on both sides of the heat-conducting top plate 511 . A second heat-conducting pad 54 is arranged between the heat-conducting side plate 512 and the battery module 4 .

[0032] Preferably, the heat-conducting frame 51 is arranged in an inverted U-shaped structure, that is, the heat-conducting side plates 512 are fixedly arranged on both sides of the heat-conducting top plate 511, the first heat-conducting pad 52 is arranged at the top of the heat-conducting top plate 511, and the elastic component 53 is arranged at the bottom of the heat-conducting top plate 511; a second heat-conducting pad 54 is arranged between the heat-conducting side plate 512 and the battery module 4 to achieve good contact between the side of the battery module 4 and the heat-conducting frame 51, establish a lower contact thermal resistance, and transfer the heat from the side of the battery module 4 to the top, and then cool it through the liquid-cooled top plate 3.

[0033] On the basis of the above technical solution, a heat absorbing fin 513 is provided on the inner side wall of the heat conducting top plate 511 , and a flange structure 514 is provided at the end of the heat conducting side plate 512 away from the heat conducting top plate 511 .

[0034] By providing a plurality of heat-absorbing fins 513 at the top of the inner wall of the heat-conducting top plate 511, which is in contact with the battery module 4, the heat generated by the battery module and the multiple internal cells can be absorbed from the relatively closed space of the battery module 4, thereby improving the heat conduction effect. By designing a flange structure 514 at the four corners of the heat-conducting side plate 512, it can be assembled with the bundling component 43 of the battery module 4, i.e., the steel belt, to facilitate assembly while preventing the heat-conducting frame 51 from being greatly displaced under the pressure of the liquid-cooling top plate 3; and the heat from the side of the cell is transferred to the top of the battery module, and then transferred to the liquid-cooling top plate 3 for cooling and heat exchange.

[0035] Based on the above technical solution, the elastic component 53 is configured as highly elastic silicone rubber, a spring or a spring sheet.

[0036] On the basis of the above technical solution, the battery module 4 includes a battery cell 41, an end plate 42 and a bundling assembly 43. The battery cells 41 are evenly arranged in plurality, and the end plates 42 are symmetrically arranged on the outside of the battery cells 41 and fixed by the bundling assembly 43. Preferably, the bundling assembly 43 can be made of a steel belt, that is, it can fix the battery cells 41 in the battery module 4; the flange structure 514 is adapted to the bundling assembly 43, that is, the bundling steel belt is used to limit the interface heat conduction device 5.

[0037] In a preferred embodiment, a plurality of the interface heat conduction devices 5 may be provided, that is, each battery cell 41 in the battery module 4 is correspondingly provided with an interface heat conduction device 5 , which has a better heat conduction effect.

[0038] On the basis of the above technical solution, the liquid-cooled bottom plate 2 is provided with a first coolant inlet 21 and a first coolant outlet 22, and the liquid-cooled top plate 3 is provided with a second coolant inlet 31 and a second coolant outlet 32. The coolant inlet and outlet are provided on both the liquid-cooled bottom plate 2 and the liquid-cooled top plate 3 to facilitate the circulation of the coolant, quickly take away the heat generated by the battery cells in the battery module, and achieve efficient heat dissipation. The coolant in the liquid-cooled bottom plate 2 enters from the first coolant inlet 21 and flows out from the first coolant outlet 22. Similarly, the coolant in the liquid-cooled top plate 3 enters from the second coolant inlet 31 and flows out from the second coolant outlet 32; and the first coolant inlet 21 is connected in parallel with the second coolant inlet 31, and the first coolant outlet 22 is connected in parallel with the second coolant outlet 32.

[0039] Based on the above technical solution, the first thermal pad 52 and the second thermal pad 54 are made of thermal grease or thermal silica gel. The first thermal pad 52 and the second thermal pad 54 made of thermal grease or thermal silica gel can achieve good contact between the top of the thermal frame 51 and the liquid cooling top plate 3, and between the side of the battery module 4 and the thermal frame 51, establish a lower contact thermal resistance, and improve the heat transfer efficiency.

[0040] Based on the above technical solution, the liquid cooling bottom plate 2 and the liquid cooling top plate 3 are made of stamped aluminum profile material, and the battery box 1 is made of Q235A steel material. In a preferred embodiment, the liquid cooling plate is made of aluminum material, and the battery box is made of steel material, that is, the above materials are used so that the battery box can provide rigidity support, and the liquid cooling bottom plate and the liquid cooling top plate can achieve rapid heat conduction.

[0041] More preferably, the liquid cooling method proposed in the present application is compatible with most square battery cells on the market, and can also be applied to energy storage systems such as blade battery cells, i.e. battery cells with a length of more than 1m, a thickness of less than 20mm, and a width of less than 200mm. At the same time, it also has good application prospects in vehicle power systems and has strong applicability.

[0042] The basic principle and main features of the utility model are shown and described above. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments. Therefore, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the appended claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model.

[0043] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A double-sided cooling battery pack, characterized in that: The invention comprises a battery box (1), a liquid-cooling bottom plate (2) and a liquid-cooling top plate (3), wherein a plurality of battery modules (4) are arranged in the battery box (1), the liquid-cooling bottom plate (2) is arranged at the bottom end of the battery box (1), and the liquid-cooling top plate (3) is arranged at the top end of the battery box (1), and a cooling liquid circulates in both the liquid-cooling bottom plate (2) and the liquid-cooling top plate (3), and an interface heat conduction device (5) is arranged between the battery module (4) and the liquid-cooling top plate (3) for extracting heat from the top and side of the battery module (4).

2. A double-sided cooled battery pack according to claim 1, characterized in that: The interface heat conduction device (5) comprises a heat conduction frame (51), a first heat conduction pad (52) and an elastic component (53); the heat conduction frame (51) is buckled on the battery module (4); the first heat conduction pad (52) is arranged between the top end of the heat conduction frame (51) and the liquid cooling top plate (3); and the elastic component (53) is arranged between the bottom end of the heat conduction frame (51) and the battery module (4).

3. A double-sided cooled battery pack according to claim 2, characterized in that: The heat-conducting frame (51) comprises a heat-conducting top plate (511) and heat-conducting side plates (512); the heat-conducting side plates (512) are symmetrically arranged on both sides of the heat-conducting top plate (511); and a second heat-conducting pad (54) is arranged between the heat-conducting side plates (512) and the battery module (4).

4. A double-sided cooled battery pack according to claim 3, characterized in that: A heat absorbing fin (513) is provided on the inner side wall of the heat-conducting top plate (511), and a flange structure (514) is provided at the end of the heat-conducting side plate (512) away from the heat-conducting top plate (511).

5. The double-sided cooled battery pack according to claim 2, characterized in that: The elastic component (53) is configured as highly elastic silicone rubber, a spring or a spring sheet.

6. A double-sided cooled battery pack according to claim 1, characterized in that: The battery module (4) comprises a battery cell (41), an end plate (42) and a bundling assembly (43); a plurality of battery cells (41) are evenly arranged; and the end plate (42) is symmetrically arranged on the outside of the battery cell (41) and fixed by the bundling assembly (43).

7. The double-sided cooled battery pack according to claim 1, characterized in that: The liquid-cooling bottom plate (2) is provided with a first cooling liquid inlet (21) and a first cooling liquid outlet (22), and the liquid-cooling top plate (3) is provided with a second cooling liquid inlet (31) and a second cooling liquid outlet (32).

8. The double-sided cooled battery pack according to claim 3, characterized in that: The first thermally conductive pad (52) and the second thermally conductive pad (54) are made of thermally conductive silicone grease or thermally conductive silica gel.

9. The double-sided cooled battery pack according to claim 1, characterized in that: The liquid cooling bottom plate (2) and the liquid cooling top plate (3) are made of stamped aluminum profile material, and the battery box (1) is made of Q235A steel material.

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