Cooling system for bottom liquid cooling and side liquid cooling of lithium ion power battery

Abstract

The utility model discloses a bottom liquid cooling and side liquid cooling system for a lithium ion power battery, which belongs to the technical field of cooling and comprises a bottom double-layer liquid cooling plate, an upper liquid cooling cavity and a lower liquid cooling cavity are arranged in the bottom double-layer liquid cooling plate, a first liquid inlet is arranged on the lower liquid cooling cavity, the lower liquid cooling cavity is communicated with the upper liquid cooling cavity, and a second liquid inlet is arranged on the lower liquid cooling cavity. A first liquid outlet is formed in the upper-layer liquid cooling cavity, and the outer wall of the upper-layer liquid cooling cavity is used for being in contact with the bottoms of a plurality of batteries; a plurality of side liquid cooling plates are arranged on the outer wall of the upper-layer liquid cooling cavity, the batteries and the side liquid cooling plates are arranged at intervals, every two adjacent side liquid cooling plates make contact with the two side walls of the corresponding battery, the bottoms of the side liquid cooling plates are fixedly connected and communicated with inflow guide pipes, and the inflow guide pipes penetrate through the upper-layer liquid cooling cavity and extend into the lower-layer liquid cooling cavity; and a liquid outlet assembly is arranged on the side liquid cooling plate. The bottom and the side surfaces of the battery can be cooled at the same time, and the cooling effect and the cooling efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling, in particular to a bottom liquid cooling and side liquid cooling cooling system for a lithium ion power battery. Background Art

[0002] During the operation of lithium-ion power batteries, the appropriate temperature range is crucial to the performance of the battery. When working in a high temperature environment, the activity of the chemical substances inside the battery increases, and the chemical reaction generates a large amount of heat. The heat inside the battery has no time to dissipate and quickly accumulates inside the battery, which is prone to thermal runaway and safety accidents. Due to the limited space of the battery pack, the heat dissipation space of the battery is reduced, so liquid cooling is usually used to dissipate the heat of the batteries in the battery pack.

[0003] The cooling system in a conventional battery pack usually uses a single liquid cooling plate at the bottom, which has a single flow channel and cannot effectively dissipate the heat from the side of the battery in time, causing the local temperature of the battery to increase, resulting in inconsistent performance and capacity attenuation rates of each battery cell in the battery module, thereby affecting the overall performance of the battery.

[0004] To this end, a cooling system with bottom liquid cooling and side liquid cooling for lithium-ion power batteries is proposed. Utility Model Content

[0005] The utility model aims to provide a bottom liquid cooling and side liquid cooling cooling system for lithium-ion power batteries, aiming to solve or improve at least one of the above-mentioned technical problems.

[0006] To achieve the above-mentioned purpose, the utility model provides the following solutions: The utility model provides a bottom liquid cooling and side liquid cooling cooling system for lithium-ion power batteries, comprising a bottom double-layer liquid cooling plate, wherein an upper liquid cooling cavity and a lower liquid cooling cavity are arranged inside the bottom double-layer liquid cooling plate, a first liquid inlet is opened on the lower liquid cooling cavity, the lower liquid cooling cavity is communicated with the upper liquid cooling cavity, a first liquid outlet is opened on the upper liquid cooling cavity, and an outer wall of the upper liquid cooling cavity is used to contact the bottoms of a plurality of batteries;

[0007] A plurality of side liquid cooling plates are arranged on the outer wall of the upper liquid cooling cavity, a plurality of the batteries are arranged at intervals from the side liquid cooling plates, two adjacent side liquid cooling plates are respectively in contact with the two side walls of the batteries, the bottom of the side liquid cooling plate is fixedly connected and connected with an inlet conduit, the inlet conduit passes through the upper liquid cooling cavity and extends into the lower liquid cooling cavity, and a liquid outlet assembly is arranged on the side liquid cooling plate.

[0008] Preferably, a partition plate is fixedly connected to the inner cavity of the double-layer liquid cooling plate, thereby dividing the inner cavity of the double-layer liquid cooling plate into the upper liquid cooling cavity and the lower liquid cooling cavity, the first liquid inlet and the first liquid outlet are opened on the side wall of the double-layer liquid cooling plate on the same side, and the upper liquid cooling cavity and the lower liquid cooling cavity are connected through a liquid collecting component.

[0009] Preferably, the liquid collecting component includes a liquid collecting piece, which is fixedly connected above one end of the double-layer liquid cooling plate away from the first liquid inlet, and a confluence guide groove is provided at the bottom of the liquid collecting piece, and the confluence guide groove is connected to the lower liquid cooling cavity, and a confluence duct is fixedly connected and connected to one side of the liquid collecting piece, and the confluence duct is fixedly connected and connected to the upper liquid cooling cavity.

[0010] Preferably, a plurality of slots are provided on the top of the double-layer liquid cooling plate, the slots are connected to the upper liquid cooling cavity, the bottom of the side liquid cooling plate is fixedly connected to the slots, the liquid outlet assembly includes a through hole provided at the bottom of the side liquid cooling plate, a guide strip is fixedly connected to the inner top wall of the upper liquid cooling cavity, a guide groove is provided on the top of the guide strip, the bottom of the side liquid cooling plate is fixedly connected to the guide strip, and the through hole is connected to the guide groove, a second liquid outlet is provided on the side wall of the double-layer liquid cooling plate, and the guide groove is connected to the second liquid outlet.

[0011] Preferably, a serpentine flow channel is used inside the side liquid cooling plate, the inlet of the serpentine flow channel is connected to the inlet conduit, and the outlet of the serpentine flow channel is connected to the through hole.

[0012] Preferably, a plurality of second dividing strips are fixedly connected in the upper liquid cooling cavity, and two adjacent second dividing strips are staggered to form a baffle channel in the upper liquid cooling cavity, and the plurality of second dividing strips are located between the first liquid outlet and the converging conduit.

[0013] Preferably, a plurality of liquid permeable holes are provided on the guide strip.

[0014] Preferably, a thermal pad is fixedly connected to the side wall of the side liquid cooling plate in contact with the battery.

[0015] The utility model discloses the following technical effects: after the coolant enters the lower liquid cooling cavity, it respectively enters the upper liquid cooling cavity and the side liquid cooling plate, the upper liquid cooling cavity cools the bottom of the battery, and the side liquid cooling plate cools the side of the battery, thereby improving the cooling effect and cooling efficiency of the battery, and the interior of the double-layer liquid cooling plate is arranged into an upper liquid cooling cavity and a lower liquid cooling cavity, so that the coolant in the upper liquid cooling cavity absorbs heat from the battery while transferring the heat to the coolant in the lower liquid cooling cavity in time, thereby dissipating the heat in time, reducing the temperature field gradient of the battery pack, thereby improving the heat dissipation efficiency and heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is an exploded view of the double-layer liquid cooling plate in the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the side liquid cooling plate in the utility model;

[0020] Figure 4 It is a structural schematic diagram of the notch in the utility model;

[0021] Figure 5 It is a structural schematic diagram of the current collecting assembly in the utility model;

[0022] Figure 6 It is a structural schematic diagram of the guide strip in the utility model;

[0023] Figure 7 This is a schematic diagram of the internal structure of the side liquid cooling plate in the utility model.

[0024] In the figure: 1. Double-layer liquid cooling plate; 2. First liquid inlet; 3. First liquid outlet; 4. Side liquid cooling plate; 5. Inlet duct; 6. Partition plate; 7. Liquid collecting piece; 8. Converging guide groove; 9. Converging duct; 10. Notch; 11. Through hole; 12. Guide strip; 13. Guide groove; 14. Second partition strip; 15. Liquid permeable hole; 16. Thermal pad; 17. Battery; 18. Second liquid outlet; 19. Circular hole. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments 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 in 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.

[0026] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] Reference Figure 1-Figure 7The utility model provides a bottom liquid cooling and side liquid cooling cooling system for lithium-ion power batteries, comprising a bottom double-layer liquid cooling plate 1, wherein an upper liquid cooling cavity and a lower liquid cooling cavity are arranged inside the bottom double-layer liquid cooling plate 1, a first liquid inlet 2 is provided on the lower liquid cooling cavity, the lower liquid cooling cavity is connected with the upper liquid cooling cavity, a first liquid outlet 3 is provided on the upper liquid cooling cavity, and an outer wall of the upper liquid cooling cavity is used to contact the bottom of a plurality of batteries 17;

[0028] A plurality of side liquid cooling plates 4 are arranged on the outer wall of the upper liquid cooling cavity, a plurality of batteries 17 are arranged at intervals from the plurality of side liquid cooling plates 4, two adjacent side liquid cooling plates 4 are in contact with the two side walls of the battery 17 respectively, a bottom of the side liquid cooling plate 4 is fixedly connected and connected with an inlet conduit 5, the inlet conduit 5 passes through the upper liquid cooling cavity and extends into the lower liquid cooling cavity, and a liquid outlet assembly is arranged on the side liquid cooling plate 4;

[0029] After entering the lower liquid cooling cavity, the coolant enters the upper liquid cooling cavity and the side liquid cooling plate 4 respectively. The upper liquid cooling cavity cools the bottom of the battery 17, and the side liquid cooling plate 4 cools the side of the battery 17, thereby improving the cooling effect and cooling efficiency of the battery 17, and the interior of the double-layer liquid cooling plate 1 is arranged into an upper liquid cooling cavity and a lower liquid cooling cavity, so that the coolant in the upper liquid cooling cavity absorbs heat from the battery 17 while transferring the heat to the coolant in the lower liquid cooling cavity in time, thereby dissipating the heat in time, reducing the temperature field gradient of the battery pack, and thus improving the heat dissipation efficiency and heat dissipation effect.

[0030] In a further optimized solution, a partition plate 6 is fixedly connected to the inner cavity of the double-layer liquid cooling plate 1, thereby dividing the inner cavity of the double-layer liquid cooling plate 1 into an upper liquid cooling cavity and a lower liquid cooling cavity, and the first liquid inlet 2 and the first liquid outlet 3 are provided on the side wall of the double-layer liquid cooling plate 1 on the same side, and the upper liquid cooling cavity and the lower liquid cooling cavity are connected through a liquid collecting component;

[0031] The liquid collecting assembly includes a liquid collecting member 7, which is fixedly connected to the upper side of the end of the double-layer liquid cooling plate 1 away from the first liquid inlet 2, and a confluence guide groove 8 is provided at the bottom of the liquid collecting member 7, and the confluence guide groove 8 is connected to the lower liquid cooling cavity, and a confluence conduit 9 is fixedly connected and connected to one side of the liquid collecting member 7, and the confluence conduit 9 is fixedly connected and connected to the upper liquid cooling cavity;

[0032] A liquid inlet through hole (not shown in the figure) is provided on the side wall of the double-layer liquid cooling plate 1 opposite to the first liquid outlet 3, and the confluence conduit 9 is fixedly connected to the liquid inlet through hole, so as to communicate with the upper liquid cooling cavity;

[0033] The top of the liquid collecting member 7 is flush with the top of the double-layer liquid cooling plate 1;

[0034] A plurality of circular holes 19 are provided on the partition plate 6, and the inlet conduit 5 penetrates the circular holes 19 and extends into the lower liquid cooling cavity; the coolant enters the lower liquid cooling cavity through the first liquid inlet 2, and then flows into the side liquid cooling plate 4 through the inlet conduit 5, and at the same time flows into the confluence guide groove 8, and flows into the upper liquid cooling cavity through the confluence conduit 9.

[0035] Further optimized solution, a plurality of notches 10 are provided on the top of the double-layer liquid cooling plate 1, the notches 10 are connected to the upper liquid cooling cavity, the bottom of the side liquid cooling plate 4 is fixedly connected to the notch 10, the liquid outlet assembly includes a through hole 11 provided at the bottom of the side liquid cooling plate 4, a guide bar 12 is fixedly connected to the inner top wall of the upper liquid cooling cavity, a guide groove 13 is provided on the top of the guide bar 12, the bottom of the side liquid cooling plate 4 is fixedly connected to the guide bar 12, and the through hole 11 is connected to the guide groove 13, a second liquid outlet 18 is provided on the side wall of the double-layer liquid cooling plate 1, and the guide groove 13 is connected to the second liquid outlet 18;

[0036] The guide strip 12 is provided with a plurality of liquid permeable holes 15;

[0037] The side liquid cooling plate 4 is fixed in the slot 10 and sealed, the guide bar 12 is located on one side of the upper liquid cooling cavity, and a plurality of liquid permeable holes 15 facilitate the circulation of the coolant on both sides of the guide bar 12. After the coolant enters the side liquid cooling plate 4 and is cooled, it flows into the guide groove 13 through the through hole 11, and then flows out through the second liquid outlet 18 to realize circulating flow.

[0038] As a further optimization scheme, a serpentine flow channel is used inside the side liquid cooling plate 4, the inlet of the serpentine flow channel is connected to the inlet conduit 5, and the outlet of the serpentine flow channel is connected to the through hole 11; thereby improving the uniformity of cooling the side of the battery 17.

[0039] A further optimized solution is that a plurality of second dividing strips 14 are fixedly connected in the upper liquid cooling cavity, and two adjacent second dividing strips 14 are staggered so that a folding channel is formed in the upper liquid cooling cavity, and the plurality of second dividing strips 14 are located between the first liquid outlet 3 and the converging conduit 9; after the coolant enters the upper liquid cooling cavity, a folded flow can be realized under the plurality of second dividing strips 14, thereby improving the uniformity of heat dissipation on the bottom surface of the battery 17.

[0040] Further optimization scheme, a heat conductive pad 16 is fixedly connected to the side wall of the side liquid cooling plate 4 in contact with the battery 17, and the heat conductive pad 16 can quickly transfer the heat on the side of the battery 17 to the side liquid cooling plate 4, thereby improving the heat exchange efficiency and effectively preventing the thermal expansion of the single battery and the impact during the movement of the vehicle, thereby satisfying the side cooling of the single battery and making the mechanical preload of the cooling system better;

[0041] In an optional embodiment, valves are respectively provided on the conduit 9 and the inlet conduit 5, so that according to the heat generated by the battery, it is possible to choose to open only the side cooling, or only the bottom cooling, or both the side cooling and the bottom cooling.

[0042] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0043] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A cooling system for bottom liquid cooling and side liquid cooling for lithium-ion power batteries, characterized in that: The invention comprises a bottom double-layer liquid cooling plate (1), wherein an upper liquid cooling cavity and a lower liquid cooling cavity are arranged inside the bottom double-layer liquid cooling plate (1), a first liquid inlet (2) is provided on the lower liquid cooling cavity, the lower liquid cooling cavity is connected to the upper liquid cooling cavity, a first liquid outlet (3) is provided on the upper liquid cooling cavity, and an outer wall of the upper liquid cooling cavity is used to contact the bottom of a plurality of batteries (17); A plurality of side liquid cooling plates (4) are arranged on the outer wall of the upper liquid cooling cavity, a plurality of the batteries (17) are arranged at intervals from the plurality of side liquid cooling plates (4), two adjacent side liquid cooling plates (4) are respectively in contact with the two side walls of the batteries, the bottom of the side liquid cooling plate (4) is fixedly connected to and connected with an inlet conduit (5), the inlet conduit (5) passes through the upper liquid cooling cavity and extends into the lower liquid cooling cavity, and a liquid outlet assembly is arranged on the side liquid cooling plate (4).

2. The bottom liquid cooling and side liquid cooling cooling system for lithium-ion power batteries according to claim 1, characterized in that: A partition plate (6) is fixedly connected to the inner cavity of the double-layer liquid cooling plate (1), thereby dividing the inner cavity of the double-layer liquid cooling plate (1) into the upper liquid cooling cavity and the lower liquid cooling cavity; the first liquid inlet (2) and the first liquid outlet (3) are arranged on the side wall of the double-layer liquid cooling plate (1) on the same side; the upper liquid cooling cavity and the lower liquid cooling cavity are connected via a liquid collecting component.

3. The bottom liquid cooling and side liquid cooling cooling system for lithium-ion power batteries according to claim 2, characterized in that: The liquid collecting assembly comprises a liquid collecting part (7), the liquid collecting part (7) being fixedly connected to the upper part of one end of the double-layer liquid cooling plate (1) away from the first liquid inlet (2), a confluence guide groove (8) being provided at the bottom of the liquid collecting part (7), the confluence guide groove (8) being connected to the lower layer liquid cooling cavity, a confluence conduit (9) being fixedly connected to and connected to one side of the liquid collecting part (7), the confluence conduit (9) being fixedly connected to and connected to the upper layer liquid cooling cavity.

4. The bottom liquid cooling and side liquid cooling cooling system for lithium-ion power batteries according to claim 1, characterized in that: The top of the double-layer liquid cooling plate (1) is provided with a plurality of notches (10), the notches (10) are connected to the upper liquid cooling cavity, the bottom of the side liquid cooling plate (4) is fixedly connected to the notches (10), the liquid outlet assembly comprises a through hole (11) provided at the bottom of the side liquid cooling plate (4), a guide bar (12) is fixedly connected to the inner top wall of the upper liquid cooling cavity, a guide groove (13) is provided at the top of the guide bar (12), the bottom of the side liquid cooling plate (4) is fixedly connected to the guide bar (12), and the through hole (11) is connected to the guide groove (13), a second liquid outlet (18) is provided on the side wall of the double-layer liquid cooling plate (1), and the guide groove (13) is connected to the second liquid outlet (18).

5. The bottom liquid cooling and side liquid cooling cooling system for lithium-ion power batteries according to claim 4, characterized in that: The side liquid cooling plate (4) has a serpentine flow channel inside, the inlet of the serpentine flow channel is connected to the inlet conduit (5), and the outlet of the serpentine flow channel is connected to the through hole (11).

6. The bottom liquid cooling and side liquid cooling cooling system for lithium-ion power batteries according to claim 3, characterized in that: A plurality of second partition strips (14) are fixedly connected in the upper liquid cooling cavity, and two adjacent second partition strips (14) are staggered so that a baffle channel is formed in the upper liquid cooling cavity, and the plurality of second partition strips (14) are located between the first liquid outlet (3) and the converging conduit (9).

7. The bottom liquid cooling and side liquid cooling cooling system for lithium-ion power batteries according to claim 4, characterized in that: The guide strip (12) is provided with a plurality of liquid permeable holes (15).

8. The bottom liquid cooling and side liquid cooling cooling system for lithium-ion power batteries according to claim 1, characterized in that: A heat-conducting pad (16) is fixedly connected to the side wall of the side liquid cooling plate (4) in contact with the battery (17).

Images