Lithium battery pack convenient for heat dissipation

Abstract

The utility model relates to a lithium battery pack convenient for heat dissipation. The battery pack comprises a plurality of battery pack modules, wherein each battery pack module consists of a battery frame, a fan module and a plurality of battery monomers; the battery frame is composed of a bottom plate, a middle plate, a cover plate and structural columns, the bottom plate, the middle plate and the cover plate are horizontally and fixedly connected at intervals through the structural columns, a bottom through hole is formed in the bottom plate, a lower positioning groove designed to sink is formed in the upper surface of the bottom plate, a top through hole is formed in the cover plate, and an upper positioning groove designed to sink is formed in the lower surface of the cover plate. The middle plate is of a hollow frame structure, and the battery monomers are located in the middle plate. Each battery pack module is provided with a fan module, and gaps are formed among the battery monomers in the battery pack modules, so that when the fan modules are started, airflow can pass through the gaps to take away heat generated by the battery monomers, heat accumulated in the battery pack is reduced, and the heat dissipation effect of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to a battery pack, in particular to a lithium battery pack which is convenient for heat dissipation. Background Art

[0002] A lithium battery pack is a battery product that is made by connecting multiple small batteries in series and / or in parallel to meet the requirements of voltage, output power, etc. The small battery is preferably a cylindrical structure, which has better consistency and energy density, and is easy to produce and has mature technology. However, when a large number of small batteries are arranged at a higher density, the gap inside the battery pack is small and not conducive to airflow. Therefore, when the battery pack is discharged for a long time or charged quickly, the temperature inside the battery pack is easily accumulated and causes the temperature of the small batteries to rise. This will create certain safety risks, reduce the life of the battery, and accelerate the aging of the battery pack. Therefore, improving the heat dissipation effect of the battery pack has always been one of the research directions of lithium battery manufacturers. Summary of the invention

[0003] The utility model provides a lithium battery pack which is convenient for heat dissipation, and solves the problem of poor heat dissipation effect of lithium battery packs in the prior art.

[0004] The above technical problems of the utility model are mainly solved by the following technical solutions: a lithium battery pack that is easy to dissipate heat, characterized in that it includes a plurality of battery pack modules arranged in a matrix array, the battery pack module is composed of a battery frame of a rectangular structure, a fan module installed on one side of the short side of the battery frame, and a plurality of battery cells installed in the battery frame, the battery cells are distributed in two rows, and gaps are formed between them; the battery frame is composed of a bottom plate, an intermediate plate, a cover plate and a structural column, the structural column fixes and connects the bottom plate, the intermediate plate and the cover plate horizontally at intervals, the bottom plate is provided with bottom through holes corresponding to the battery cells one by one, the upper surface of the bottom plate is provided with a lower positioning groove of a sinking design, the cover plate is provided with a top through hole corresponding to the battery cells one by one, the lower surface of the cover plate is provided with an upper positioning groove of a sunken design, the intermediate plate is a hollow frame structure, the battery cells are located inside the intermediate plate, and the upper and lower ends are respectively abutted against the upper positioning groove and the lower positioning groove; a temperature detection chip is provided in the battery frame.

[0005] First, the utility model is composed of a plurality of battery modules, each of which is equipped with a fan module. At the same time, gaps are formed between the battery cells in the battery module. Therefore, when the fan module is started, airflow can pass through the gaps to take away the heat generated by the battery cells, thereby reducing the heat accumulated inside the utility model and improving the heat dissipation effect of the utility model. The temperature detection chip is used to detect the temperature inside the utility model in real time. The fan module will only be started when the temperature is higher than the set temperature.

[0006] Since the battery pack modules are arranged in a matrix, the hot air blown out from one battery pack module can be easily sucked away by the adjacent fan module, which results in a small amount of actual cold air intake, a small amount of heat exchanged, and a poor actual heat dissipation effect. To this end, the fan module is composed of a shell, a hot air guide groove, a cold air input groove and a fan assembly. The cold air input groove is arranged between the fan assembly and the hot air guide groove. The cold air input groove is connected to the air inlet end of the fan assembly. The blast end of the fan assembly is arranged directly opposite to the battery frame, and the air inlet of the hot air guide groove is the blast end facing away from the fan assembly. Most of the hot air blown out from each battery pack module will flow into the hot air guide groove on the adjacent fan module and be discharged from the exhaust port of the hot air guide groove. The air inlet of the cold air input groove and the exhaust port of the hot air guide groove are staggered to prevent the hot air from being captured by the adjacent fan module again, thereby increasing the actual amount of cold air intake during heat dissipation of the utility model and improving the heat dissipation effect.

[0007] Furthermore, a number of metal heat sinks are horizontally spaced between the bottom plate, the middle plate and the cover plate, the profile of the metal heat sink is consistent with the middle plate, and is fixed to the structural column. The metal heat sink can be used to absorb heat from the battery cells and increase the contact area with the air, greatly improving the heat conduction efficiency and the overall heat dissipation effect.

[0008] Therefore, compared with the prior art, the utility model has the following characteristics: 1. Each battery pack module is equipped with a fan module, and gaps are formed between the battery cells in the battery pack module. Therefore, when the fan module is started, airflow can pass through the gaps and take away the heat generated by the battery cells, thereby reducing the heat accumulated inside the utility model and improving the heat dissipation effect of the utility model; 2. The air inlet of the cold air input groove and the exhaust port of the hot air guide groove are staggered to prevent the hot air from being captured again by the adjacent fan module, thereby increasing the actual cold air intake amount of the utility model during heat dissipation and improving the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Attached Figure 1 It is a structural schematic diagram of the utility model;

[0010] Attached Figure 2It is a structural schematic diagram of a battery pack module;

[0011] Attached Figure 3 is a cross-sectional view of a battery pack module;

[0012] Attached Figure 4 It is a schematic diagram of the structure of the base plate or cover plate;

[0013] Attached Figure 5 It is a schematic diagram of the structure of the intermediate plate or metal heat sink;

[0014] Attached Figure 6 It is a structural diagram of the fan module. DETAILED DESCRIPTION

[0015] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0016] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element 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.

[0017] Example 1: See Figure 1 , Figure 2 and Figure 3 , a lithium battery pack for heat dissipation, comprising four battery pack modules 100 arranged in a 2*2 matrix array, the battery pack module is composed of a battery frame 200 of a rectangular parallelepiped structure, a fan module 300 installed on one side of the short side of the battery frame, and a plurality of battery cells 400 installed in the battery frame, the battery cells are distributed in two rows, and there is a gap between them, the gap is between 2 and 5 mm; the battery frame is composed of a bottom plate 210, an intermediate plate 220, a cover plate 230 and a structural column 240, wherein the bottom plate, the intermediate plate and the cover plate are all made of high-strength plastic, the structural column fixes and connects the bottom plate, the intermediate plate and the cover plate horizontally at intervals, the bottom plate is provided with bottom through holes 211 corresponding to the battery cells one by one, the upper surface of the bottom plate is provided with lower positioning grooves 212 of a sinking design, the cover plate is provided with top through holes 231 corresponding to the battery cells one by one, and the lower surface of the cover plate is provided with an upper positioning groove 232 of a recessed design (see Figure 4), the middle plate is a hollow frame structure, the battery cell is located inside the middle plate, and the upper and lower ends are respectively in contact with the upper positioning groove and the lower positioning groove; a temperature detection chip is provided in the battery frame; a number of connecting plates 210 are fixedly connected between adjacent battery pack modules, and the connecting plates are used to connect and fix adjacent bottom plates and cover plates. The positive and negative electrodes between the battery cells need to be connected in parallel or in series by welding nickel sheets, and the bottom through holes and the top through holes are to leave welding space for the nickel sheets.

[0018] First, this embodiment is composed of a plurality of battery modules, each of which is equipped with a fan module. At the same time, gaps are formed between the battery cells in the battery module. Therefore, when the fan module is started, airflow can pass through the gaps to take away the heat generated by the battery cells, thereby reducing the heat accumulated inside this embodiment and improving the heat dissipation effect of this embodiment. The temperature detection chip is used to detect the temperature inside this embodiment in real time. The fan module will only be started when the temperature is higher than the set temperature.

[0019] Since the battery modules are arranged in a matrix, the hot air blown out from one battery module can be easily sucked away by the adjacent fan module, which results in a small amount of cold air inhaled and a small amount of heat exchanged, resulting in poor heat dissipation. To this end, the fan module is composed of a housing 310, a hot air guide slot 320, a cold air input slot 330 and a fan assembly 340 (see Figure 3 and Figure 6 ), the cold air input slot is arranged between the fan assembly and the hot air guide slot, the cold air input slot is connected to the air inlet end of the fan assembly, the air blowing end of the fan assembly is arranged directly opposite to the battery frame, the air inlet of the hot air guide slot is arranged opposite to the air blowing end of the fan assembly, the air inlet of the cold air input slot is arranged downward, and the air outlet of the hot air guide slot is arranged upward. Most of the hot air blown out of each battery module will flow into the hot air guide slot on the adjacent fan module and be discharged from the air outlet of the hot air guide slot. The air inlet of the cold air input slot and the air outlet of the hot air guide slot are staggered to prevent the hot air from being captured by the adjacent fan module again, thereby increasing the actual cold air intake amount of this embodiment during heat dissipation and improving the heat dissipation effect.

[0020] See Figure 5 A number of metal heat sinks 250 are horizontally spaced between the bottom plate, the middle plate and the cover plate. The metal heat sink has the same profile as the middle plate and is fixed to the structural column. The metal heat sink can be used to absorb heat from the battery cells and increase the contact area with the air, greatly improving the heat conduction efficiency and the overall heat dissipation effect.

[0021] It is obvious to those skilled in the art that the utility model can be changed in many ways, and such changes are not considered to be out of the scope of the utility model. All such modifications obvious to those skilled in the art will be included in the scope of the claims.

Claims

1. A lithium battery pack that is easy to dissipate heat, characterized in that: The invention comprises a plurality of battery pack modules arranged in a matrix array, wherein the battery pack modules are composed of a battery frame of a rectangular structure, a fan module installed on one side of the short side of the battery frame and a plurality of battery cells installed in the battery frame, wherein the battery cells are distributed in two rows with gaps formed therebetween; the battery frame is composed of a bottom plate, an intermediate plate, a cover plate and a structural column, wherein the structural column fixes and connects the bottom plate, the intermediate plate and the cover plate at horizontal intervals, the bottom plate is provided with bottom through holes corresponding to the battery cells one by one, the upper surface of the bottom plate is provided with lower positioning grooves of a sunken design, the cover plate is provided with top through holes corresponding to the battery cells one by one, the lower surface of the cover plate is provided with an upper positioning groove of a sunken design, the intermediate plate is a hollow frame structure, the battery cells are located inside the intermediate plate, and the upper and lower ends are respectively abutted against the upper positioning groove and the lower positioning groove; a temperature detection chip is provided in the battery frame.

2. The lithium battery pack for heat dissipation according to claim 1, characterized in that: The fan module is composed of a shell, a hot air guide groove, a cold air input groove and a fan assembly. The cold air input groove is arranged between the fan assembly and the hot air guide groove. The cold air input groove is connected to the air inlet end of the fan assembly. The blowing end of the fan assembly is arranged to face the battery frame, and the air inlet of the hot air guide groove is facing away from the blowing end of the fan assembly.

3. The lithium battery pack for heat dissipation according to claim 2, characterized in that: The air inlet of the cold air input groove is arranged downward, and the air outlet of the hot air guide groove is arranged upward.

4. The lithium battery pack for heat dissipation according to claim 1, characterized in that: A plurality of metal heat sinks are horizontally spaced apart between the bottom plate, the middle plate and the cover plate. The contour of the metal heat sink is consistent with that of the middle plate and is fixed on the structural column.

5. The lithium battery pack for heat dissipation according to claim 1, characterized in that: A plurality of connecting plates are fixedly connected between adjacent battery pack modules, and the connecting plates are used to connect and fix adjacent bottom plates and cover plates.

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