Battery pack heat dissipation structure

Abstract

The utility model discloses a heat dissipation structure of a battery pack. The heat dissipation structure comprises battery blocks, transverse phase-change heat-conducting fins, longitudinal phase-change heat-conducting fins and a heat dissipation assembly, the plurality of transverse phase-change heat-conducting fins and the plurality of longitudinal phase-change heat-conducting fins are arranged in a crossed manner to form a plurality of partition frames, the battery blocks are inserted and mounted in the partition frames to form a battery cluster, heat dissipation assemblies are arranged at the bottoms of the partition frames and comprise aluminum bottom plates and copper heat dissipation pipes, and the copper heat dissipation pipes are embedded into the aluminum bottom plates in a pipe array manner; the aluminum bottom plate is connected with the bottom of the partition frame, the bottom of the battery cluster abuts against the top face of the aluminum bottom plate in an attached mode, and the transverse phase-change heat-conducting fins and the longitudinal phase-change heat-conducting fins are both made of graphene materials. And meanwhile, the graphene phase change heat-conducting fins are adopted, and heat at the bottom of the battery block is directly conducted to the aluminum bottom plate, so that the temperature difference between the upper part and the bottom of the battery block is small, the heat dissipation temperature uniformity of the single battery block is improved, the service life of the battery pack is prolonged, and the heat exchange rate of the battery cluster is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery PACK, in particular to a heat dissipation structure for a battery pack. Background Art

[0002] At present, the more common cooling methods for energy storage batteries are mainly air cooling and liquid cooling. The air cooling system has low heat exchange efficiency of the unit and uneven temperature, and is mainly applied to equipment with low energy density of energy storage. The liquid cooling system uses a compressor to work for forced refrigeration. The refrigerant first cools the coolant, and then the coolant takes away the heat of the battery through a cold plate. For example, the liquid cooling system needs to go through two heat exchanges (refrigerant-coolant, coolant-battery cluster), with low heat exchange efficiency and high water pump power consumption, which is not conducive to energy-saving operation. The refrigerant in the liquid cooling circuit is generally a 50% ethylene glycol aqueous solution, and the heat exchange efficiency between the refrigerant and the cold plate is low, and the heat dissipation capacity is limited. In the prior art, phase change materials are generally filled into the gaps between or around the batteries. Some high thermal conductivity materials used to improve the thermal conductivity of the phase change materials, such as metal nanoparticles and metal foams, are mostly good conductors. If the battery module is squeezed or the phase change material expands at high temperature, these thermal conductivity materials are very likely to contact the battery electrodes, resulting in battery short circuit. At present, liquid cooling is the mainstream development and application direction, but the battery rate during its operation is low and cannot meet the heat dissipation requirements of high-rate battery cells. Summary of the Utility Model

[0003] Therefore, the utility model provides a heat dissipation structure for a battery pack to solve the above problems in the prior art.

[0004] In order to achieve the above object, the utility model provides the following technical solutions:

[0005] According to the first aspect of the utility model, a heat dissipation structure for a battery pack includes battery blocks, horizontal phase change heat conduction sheets, vertical phase change heat conduction sheets and a heat dissipation component; a plurality of the horizontal phase change heat conduction sheets and a plurality of the vertical phase change heat conduction sheets are arranged crosswise to form a plurality of partitions, the battery blocks are inserted and installed in the partitions to form a battery cluster, the bottom of the partitions is provided with the heat dissipation component, the heat dissipation component includes an aluminum bottom plate and a copper heat dissipation pipe, the copper heat dissipation pipe is embedded in the aluminum bottom plate in a tube arrangement, the aluminum bottom plate is connected to the bottom of the partition, and the bottom of the battery cluster is attached and abutted against the top surface of the aluminum bottom plate. Among them, both the horizontal phase change heat conduction sheet and the vertical phase change heat conduction sheet are made of graphene material.

[0006] Further, the thickness of both the horizontal phase change heat conduction sheet and the vertical phase change heat conduction sheet is 2 mm.

[0007] Further, limiting plates are respectively arranged at opposite ends of the aluminum bottom plate, and the battery cluster is clamped between the two limiting plates.

[0008] Further, it further includes a housing, the housing is sleeved on the battery cluster, and the bottom of the housing is detachably and hermetically connected to the aluminum bottom plate.

[0009] Further, a plurality of reinforcing plates are provided at the bottom of the housing, the plurality of reinforcing plates are arranged in an array, and the reinforcing plates protrude at least partially outwards along the height direction of the housing.

[0010] Further, explosion-proof valve mounting holes, a plug-in panel and a maintenance panel are preset on the side wall of the housing, and the explosion-proof valve mounting holes, the plug-in panel and the maintenance panel are on the same side of the side wall of the housing.

[0011] Further, the refrigerant in the copper heat dissipation tube is R134a.

[0012] The utility model has the following advantages:

[0013] A plurality of transverse phase change heat conduction sheets and a plurality of longitudinal phase change heat conduction sheets are arranged crosswise to form a plurality of partitions. The heat conduction sheets are all made of graphene material. The battery blocks are inserted and installed in the partitions to form a battery cluster. The heat of the single battery block is conducted to the phase change heat conduction sheets. When the battery cluster is working, the heat generated on the outer wall of the battery cluster is conducted to the aluminum bottom plate of the heat dissipation assembly through the partitions formed by the transverse phase change heat conduction sheets and the longitudinal phase change heat conduction sheets. The heat generated at the bottom of the battery cluster is directly conducted to the aluminum bottom plate. The battery blocks are inserted and installed in the partitions to form a battery cluster, so that the single battery blocks are fully covered on all sides and assisted in heat dissipation. At the same time, graphene phase change heat conduction sheets are used. The graphene phase change heat conduction sheets have good heat conductivity, heat dissipation and heat conduction performance. The heat at the bottom of the battery block is directly conducted to the aluminum bottom plate, so that the temperature difference between the upper part and the bottom of the battery block is small, and the heat dissipation temperature uniformity of the single battery block itself is improved. The heat is dissipated evenly, the service life of the battery pack is prolonged, the heat exchange rate of the battery cluster is improved, and a good heat dissipation effect is achieved on the single battery block. Description of the Drawings

[0014] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained according to the provided drawings.

[0015] The structures, proportions, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present utility model. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present utility model.

[0016] Figure 1 An exploded view of a battery pack heat dissipation structure provided by some embodiments of the present utility model.

[0017] Figure 2 A perspective view of a battery pack heat dissipation structure provided by some embodiments of the present utility model.

[0018] Figure 3 An exploded view of a battery cluster and a phase change heat conducting sheet provided by some embodiments of the present utility model.

[0019] Figure 4 A front view of a battery cluster and a phase change heat conducting sheet provided by some embodiments of the present utility model.

[0020] Figure 5 A perspective view of a battery cluster and a phase change heat conducting sheet provided by some embodiments of the present utility model.

[0021] In the figure:

[0022] 1 - housing, 101 - reinforcing plate, 102 - explosion-proof valve mounting hole, 103 - plug panel hole, 104 - maintenance panel hole;

[0023] 2 - battery cluster, 201 - battery block;

[0024] 3 - phase change heat conducting sheet, 301 - transverse phase change heat conducting sheet, 302 - longitudinal phase change heat conducting sheet;

[0025] 4 - heat dissipation component, 401 - aluminum bottom plate, 402 - copper heat dissipation pipe, 403 - liquid inlet, 404 - liquid outlet, 405 - limiting plate. Specific embodiments

[0026] The following specific embodiments illustrate the implementation manners of the present utility model. Those familiar with this technology can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] Such asFigures 1 to 5 As shown in Figures 1 to 5 , a battery pack heat dissipation structure in the first aspect embodiment of the present utility model includes a battery block 201, a phase change heat conduction sheet 3, and a heat dissipation component 4. The phase change heat conduction sheet 3 includes a horizontal phase change heat conduction sheet 301 and a vertical phase change heat conduction sheet 302. A plurality of horizontal phase change heat conduction sheets 301 are arranged in parallel from top to bottom in sequence, and a plurality of vertical phase change heat conduction sheets 302 are arranged in parallel from left to right in sequence. The plurality of horizontal phase change heat conduction sheets 301 and the plurality of vertical phase change heat conduction sheets 302 are arranged in a cross pattern to form a number of partitions. The battery block 201 is inserted and installed in the partitions to form a battery cluster 2. The outer wall of the battery block 201 is in close contact with the inner wall of the partition. At the same time, a heat dissipation component 4 is provided at the bottom of the partition. The heat dissipation component 4 includes an aluminum bottom plate 401 and a copper heat dissipation tube 402. The copper heat dissipation tube 402 is embedded in the aluminum bottom plate 401 in a tube array manner. The refrigerant in the copper heat dissipation tube 402 is generally r-134a. Using r-134a to replace 50% ethylene glycol aqueous solution, r-134a has the advantages of being non-flammable, non-explosive, non-toxic, and non-irritating. It has good safety performance and is safe and reliable to use. The aluminum bottom plate 401 is connected to the bottom of the partition, so that the bottom of the battery cluster 2 is in close contact with the top surface of the aluminum bottom plate 401. Among them, both the horizontal phase change heat conduction sheet 301 and the vertical phase change heat conduction sheet 302 are made of graphene material.

[0028] Working principle: Multiple horizontal phase change heat conducting sheets 301 and multiple vertical phase change heat conducting sheets 302 are arranged crosswise to form several partitions. These heat conducting sheets are all made of graphene material. The battery blocks 201 are inserted and installed in the partitions to form a battery cluster 2. The heat of the single battery block 201 is conducted to the phase change heat conducting sheet 3. The liquid inlet 403 of the cooling pipe 402 is connected to the liquid outlet of the direct cooler through a pipeline. The refrigerant (5r-134a) enters the copper cooling pipe 402 through the pipeline. When the battery cluster 2 is operating, the heat generated on the outer wall of the battery cluster 2 is conducted to the aluminum bottom plate 401 of the heat dissipation component 4 through the partitions formed by the horizontal phase change heat conducting sheet 301 and the vertical phase change heat conducting sheet 302. The heat generated at the bottom of the battery cluster 2 is directly conducted to the aluminum bottom plate 401. At this time, the refrigerant (r-134a) in the copper cooling pipe 402 starts to cool and dissipate the heat conducted by the aluminum bottom plate 401. The refrigerant changes from liquid to gas to absorb heat, and the gaseous refrigerant flows back to the direct cooler through the pipeline from the liquid outlet 404 of the copper cooling pipe 402 to complete one cycle. The graphene phase change heat conducting sheet 3 is a semi-metal, between a conductor and a semiconductor, with good thermal conductivity, heat dissipation and heat conduction performance. The battery blocks 201 are inserted and installed in the partitions to form a battery cluster 2, so that the single battery block 201 is fully covered on all four sides and assisted in heat dissipation. The heat at the bottom of the battery block 201 is directly conducted to the aluminum bottom plate 401, and the temperature difference between the upper and lower parts of the battery block 201 is small, which improves the uniformity of the heat dissipation temperature of the single battery block 201, achieves uniform heat dissipation, extends the service life of the battery pack, improves the heat exchange rate of the battery cluster 2, and has a good heat dissipation effect on the single battery block 201.

[0029] It should be noted that: There is a circulation pump on the direct cooler. The circulation pump can promote the circulation of the refrigerant, make the refrigerant flow faster in the copper cooling pipe 402, and achieve the purpose of reducing heat loss and increasing the refrigerant pressure.

[0030] Optionally, the copper cooling pipe 402 can be in a U-shaped, S-shaped or serpentine tube arrangement and be embedded in the aluminum bottom plate 401.

[0031] Optionally, the thickness of both the horizontal phase change heat conducting sheet 301 and the vertical phase change heat conducting sheet 302 is 2 mm.

[0032] Optionally, the battery blocks 201 are inserted and installed in the partitions to form a battery cluster 2. This battery cluster 2 is a large-capacity square battery cluster, and the battery rate can reach above 1P.

[0033] For details, refer to Figures 1 - 4 , limiting plates 405 are respectively provided at the opposite ends of the aluminum bottom plate 401. The battery cluster 2 is clamped between the two limiting plates 405 to prevent the battery cluster 2 from being misaligned on the aluminum bottom plate 401, so that the battery cluster 2 is stably clamped and fixed on the aluminum bottom plate 401.

[0034] Specifically refer to Figure 1 and Figure 2 , the housing 1 is sleeved on the battery cluster 2, and the bottom of the housing 1 is detachably and hermetically connected to the aluminum bottom plate 401. The housing 1 can ensure the tightness of the battery cluster 2, and there is no need to consider the sealing problem of the battery cluster 2 when the vehicle is running and dissipating heat, further optimizing the heat dissipation effect.

[0035] Specifically refer to Figure 2 , a plurality of reinforcing plates 101 are provided at the bottom of the housing 1, and the plurality of reinforcing plates 101 are arranged in an array. The reinforcing plates 101 protrude at least partially outward along the height direction of the housing 1. By providing the plurality of reinforcing plates 101, the strength and stiffness of the housing 1 are ensured, and the wall thickness of the housing 1 is not increased, avoiding the deformation of the housing 1; at the same time, an explosion-proof valve mounting hole 102, a plug-in panel 103 and a maintenance panel 104 are preset on the side wall of the housing 1, and the explosion-proof valve mounting hole 102, the plug-in panel 103 and the maintenance panel 104 are on the same side of the side wall of the housing 1.

[0036] Although the present invention has been described in detail with general descriptions and specific embodiments above, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

[0037] Terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationship, without substantial change in technical content, should also be regarded as the scope of implementation of the present invention.

Claims

1. A battery pack heat dissipation structure, characterized in that: The invention comprises a battery block (201), a transverse phase-change heat conductive sheet (301), a longitudinal phase-change heat conductive sheet (302) and a heat dissipation component (4); a plurality of the transverse phase-change heat conductive sheets (301) and a plurality of the longitudinal phase-change heat conductive sheets (302) are cross-arranged to form a plurality of partitions; the battery block (201) is inserted and installed in the partition to form a battery cluster (2); the heat dissipation component (4) is arranged at the bottom of the partition; the heat dissipation component (4) comprises an aluminum base plate (401) and a copper heat dissipation pipe (402); the copper heat dissipation pipe (402) is embedded in the aluminum base plate (401) in a tube row; the aluminum base plate (401) is connected to the bottom of the partition; the bottom of the battery cluster (2) is abutted against the top surface of the aluminum base plate (401); wherein the transverse phase-change heat conductive sheet (301) and the longitudinal phase-change heat conductive sheet (302) are both made of graphene material.

2. A battery pack heat dissipation structure according to claim 1, characterized in that: The thickness of the transverse phase-change heat-conducting sheet (301) and the longitudinal phase-change heat-conducting sheet (302) are both 2 mm.

3. A battery pack heat dissipation structure according to claim 1, characterized in that: The aluminum bottom plate (401) is provided with limiting plates (405) at opposite ends thereof, and the battery cluster (2) is clamped between the two limiting plates (405).

4. A battery pack heat dissipation structure according to claim 1, characterized in that: It also comprises a shell (1), wherein the shell (1) is sleeved on the battery cluster (2), and the bottom of the shell (1) and the aluminum bottom plate (401) are detachably sealed and connected.

5. A battery pack heat dissipation structure according to claim 4, characterized in that: A plurality of reinforcing plates (101) are provided at the bottom of the shell (1), and the plurality of reinforcing plates (101) are arranged in an array, and the reinforcing plates (101) at least partially protrude outwards along the height direction of the shell (1).

6. A battery pack heat dissipation structure according to claim 4, characterized in that: The side wall of the shell (1) is preset with an explosion-proof valve installation hole (102), a plug-in panel (103) and a maintenance panel (104); the explosion-proof valve installation hole (102), the plug-in panel (103) and the maintenance panel (104) are located on the same side of the side wall of the shell (1).

7. A battery pack heat dissipation structure according to claim 1, characterized in that: The refrigerant in the copper heat dissipation pipe (402) is R134a.

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