Battery pack liquid cooling device with gravity vapor chamber

Abstract

A battery pack liquid cooling device with gravity temperature uniformizing plates comprises liquid cooling plates arranged at intervals and a plurality of gravity temperature uniformizing plates oppositely attached to the two sides of each liquid cooling plate, and the liquid cooling plates are kept vertical through a water inlet and outlet channel frame on one side and communicated with a water inlet and outlet channel. A first water passing cavity and a second water passing cavity which are communicated with each other are formed in the liquid cooling plate up and down, and a plurality of flow channels are respectively formed in the first water passing cavity and the second water passing cavity; the first end of the liquid cooling plate is provided with a cold plate water inlet communicated with the first water passing cavity; the first end of the liquid cooling plate is further provided with a cooling plate water outlet communicating with the second water passing cavity. The gravity temperature-equalizing plates comprise L-shaped vertical plates and horizontal plates, the gravity temperature-equalizing plates are attached to the two sides of the liquid cooling plate in pairs in a back-to-back mode, and the vertical plates of the gravity temperature-equalizing plates are fixedly attached to the liquid cooling plate. A micro-hole groove is correspondingly formed in the gravity temperature equalizing plate, and a phase change working medium is injected into the micro-hole groove in advance. According to the liquid cooling device for the battery pack, the phase-change heat exchange of the uniform temperature plate and the liquid cooling heat exchange of the liquid cooling plate are combined, so that the optimal heat dissipation effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pack heat dissipation technical field especially, it relates to a battery pack liquid cooling device with gravity equalizing plate. BACKGROUND

[0002] Energy storage battery box (ie the battery pack that a plurality of battery cells can be arrayed and placed inside) is the key component in energy storage system, and the technical implementation of its design, material, structure heat management and safety performance etc. has the vital influence to the performance of whole energy storage system. The existing mainstream battery cell heat management technical scheme mainly includes: liquid cooling plate technology and air cooling technology, or the combination of liquid cooling plate technology and air cooling technology. Since the heat dissipation effect of liquid cooling plate is better, the energy storage battery pack of common high cost performance in the market all adopts liquid cooling plate mode as the battery cell heat management scheme.

[0003] The liquid cooling plate mode still has the following defects in actual application: the battery cell is placed on the liquid cooling plate, and the liquid cooling plate only contacts the bottom of the battery cell, but the main heating part of the battery cell is the tab at the top and the large surface of the battery cell on the side, so that the heat dissipation efficiency of the liquid cooling plate is low. UTILITY MODEL CONTENT

[0004] In view of the defects of the prior art, the utility model provides a battery pack liquid cooling device with gravity equalizing plate to overcome the defects in the prior art.

[0005] To achieve the above object, the utility model realizes by the following technical scheme:

[0006] A battery pack liquid cooling device with gravity equalizing plate, comprising a plurality of liquid cooling plates vertically arranged in the direction of gravity and spaced apart and a plurality of gravity equalizing plates closely attached to the two sides of each liquid cooling plate, the liquid cooling plate is kept in a vertical posture by a water inlet and outlet channel frame connected to the first end thereof and is connected to the water inlet and outlet channels.

[0007] The first water passing cavity and the second water passing cavity are arranged in the liquid cooling plate, and a plurality of parallel flow channels are arranged in the first water passing cavity and the second water passing cavity; the liquid cooling plate is provided with a cooling plate water inlet at the first end close to the top position, and the cooling plate water inlet is connected to the first water passing cavity; the liquid cooling plate is provided with a cooling plate water outlet at the first end, and the cooling plate water outlet is connected to the second water passing cavity.

[0008] The gravity equalizing plate comprises a vertical plate and a horizontal plate arranged in an L shape, and the gravity equalizing plate is closely attached to the two sides of the liquid cooling plate in a back-to-back manner, and the vertical plate of the gravity equalizing plate is fixedly attached to the liquid cooling plate.

[0009] A plurality of linearly arranged L-shaped micropore grooves are arranged in the gravity equalizing plate.

[0010] Further, the micro-hole groove has an L-shaped integral vertical part and horizontal part, the vertical part and the horizontal part of the micro-hole groove correspond to the vertical plate and the horizontal plate inside the gravity equal temperature plate respectively, and the horizontal part of the micro-hole groove is pre-filled with liquid phase change working medium as the refrigerant.

[0011] Further, the water inlet and outlet flow channel frame comprises water inlet flow channel beams and water outlet flow channel beams arranged horizontally and spaced apart, and a plurality of liquid cooling limiting groove plates vertically and spaced apart connected between the water inlet flow channel beams and the water outlet flow channel beams; the number of the liquid cooling limiting groove plates corresponds to the number of the liquid cooling plates.

[0012] Further, the water inlet flow channel beam is a hollow beam, and a water inlet connecting port is formed through the intersection connection between the water inlet flow channel beam and each liquid cooling limiting groove plate, each water inlet connecting port is in communication with the cold plate water inlet port on each liquid cooling plate, so that the inner cavity of the water inlet flow channel beam is in communication with the first water passing cavity of each liquid cooling plate.

[0013] Further, the water outlet flow channel beam is a hollow beam, and a water outlet connecting port is formed through the intersection connection between the water outlet flow channel beam and each liquid cooling limiting groove plate, each water outlet connecting port is in communication with the cold plate water outlet port on each liquid cooling plate, so that the inner cavity of the water outlet flow channel beam is in communication with the second water passing cavity of each liquid cooling plate.

[0014] Further, the water inlet flow channel beam is a hollow beam, and a water inlet connecting port is formed through the intersection connection between the water inlet flow channel beam and each liquid cooling limiting groove plate, each water inlet connecting port is in communication with the cold plate water inlet port on each liquid cooling plate, so that the inner cavity of the water inlet flow channel beam is in communication with the first water passing cavity of each liquid cooling plate.

[0015] Further, the water outlet flow channel beam is a hollow beam, and a water outlet connecting port is formed through the intersection connection between the water outlet flow channel beam and each liquid cooling limiting groove plate, each water outlet connecting port is in communication with the cold plate water outlet port on each liquid cooling plate, so that the inner cavity of the water outlet flow channel beam is in communication with the second water passing cavity of each liquid cooling plate.

[0016] Preferably, the gravity equal temperature plate and the liquid cooling plate are welded, and the width of the horizontal plate of the two gravity equal temperature plates located at the outermost side of the overall battery pack is greater than the width of the horizontal plate of the other gravity equal temperature plates inside the overall battery pack.

[0017] Preferably, the two ends of the liquid cooling plate are provided with cell limiting grooves.

[0018] Preferably, the flow channels in the first water passing cavity and the second water passing cavity are seven.

[0019] Compared with the prior art, the utility model has the beneficial effects that:

[0020] 1) The battery pack liquid cooling device with a gravity equal temperature plate solves the low-efficiency heat dissipation problem of the traditional energy storage box that only uses the bottom liquid cooling plate for cooling, and combines the phase change heat transfer of the gravity equal temperature plate with the liquid cooling heat transfer of the liquid cooling plate, so that the L-shaped gravity equal temperature plate can contact the bottom surface and the side surface of the battery cell, and the heat dissipation efficiency is high.

[0021] 2) The battery pack liquid cooling device with gravity heat equalization plate of the case increases the heat transfer area of the battery cell through the gravity heat equalization plate, and arranges the liquid cooling plate on the side of the battery cell and adheres to the gravity heat equalization plate, so that the heat exchange area is larger. At the same time, the characteristics of the gravity type heat equalization plate driven by the working medium backflow are effectively utilized, and no additional driving device is needed, so that the heat dissipation efficiency of the battery cell is further increased.

[0022] 3) The battery pack liquid cooling device with gravity heat equalization plate of the case, the cold plate water inlet of the liquid cooling plate is arranged at the position corresponding to the top of the first water passing cavity, and the cold plate water outlet is arranged at the position corresponding to the top of the second water passing cavity, so that the entire liquid cooling plate is filled with cooling liquid during the heat exchange process, and the temperature of the liquid in the first water passing cavity at the high position is lower than that of the liquid in the first water passing cavity at the low position, so that the heat exchange and heat dissipation effect reaches the best state.

[0023] 4) The battery pack liquid cooling device with gravity heat equalization plate of the case has simple structure and higher heat dissipation efficiency, and is beneficial to batch production of the product.

[0024] In order to more clearly understand the utility model, the preferred embodiments of the utility model will be described below in combination with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 , Figure 2 is the use state reference drawing of the utility model;

[0026] Figure 3 , Figure 4 is the overall structure schematic view of the utility model;

[0027] Figure 5 , Figure 6 is the structure schematic view of the liquid cooling plate of the utility model;

[0028] Figure 7 , Figure 8 is the structure schematic view of the gravity heat equalization plate of the utility model;

[0029] Figure 9 is Figure 8 the enlarged schematic view of the micropore groove at position A in figure 6;

[0030] Figure 10 , Figure 11 is the structure schematic view of the water inlet and outlet flow channel frame in the utility model.

[0031] IDENTIFICATION OF DRAWINGS:

[0032] 1-liquid cooling plate, 2-gravity equalization plate, 3-inlet and outlet water channel frame; 11-first water passing cavity, 12-second water passing cavity, 13-liquid cooling plate water inlet, 14-liquid cooling plate water outlet; 21-micro-porous groove; 31-inlet water channel beam, 32-outlet water channel beam, 33-liquid cooling limiting groove plate; 311-inlet water butt joint, 312-external main water inlet; 321-outlet water butt joint, 322-external main water outlet; 9-electricity core. DETAILED DESCRIPTION

[0033] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0034] In addition, if the terms "first", "second", etc. are used only for descriptive purposes, mainly for distinguishing different devices, elements or components (the specific types and structures may be the same or different), and are not intended to indicate or imply the relative importance and quantity of the indicated devices, elements or components, and therefore cannot be understood as indicating or implying the relative importance.

[0035] In addition, it should be noted that, unless otherwise specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be understood broadly, for example, "connected" can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, can be internal communication of two elements; for those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] Please refer to Figures 1-11 The present application provides a battery pack liquid cooling device with gravity equalization plate, comprising a plurality of liquid cooling plates 1 arranged vertically and spaced apart in the direction of gravity and a plurality of gravity equalization plates 2 arranged vertically and closely on both sides of each liquid cooling plate 1, the liquid cooling plate 1 is kept in a vertical position by the inlet and outlet water channel frame 3 connected to the first end of the liquid cooling plate 1 and is connected to the inlet and outlet water channels.

[0037] The liquid cooling plate 1 is internally provided with a first water passing cavity 11 and a second water passing cavity 12 which are communicated with each other, and a plurality of parallel flow channels are respectively arranged in the first water passing cavity 11 and the second water passing cavity 12; a cold plate water inlet 13 is arranged at a first end of the liquid cooling plate 1 close to a top position, and the cold plate water inlet 13 is communicated with the first water passing cavity 11; a cold plate water outlet 14 is arranged at a middle position of the first end of the liquid cooling plate 1 and is slightly higher than the cold plate water inlet 13, and the cold plate water outlet 14 is communicated with the second water passing cavity 12; the cooling water flowing into the cold plate water inlet 13 passes through the flow channels in the first water passing cavity 11 and the flow channels in the second water passing cavity 12 in sequence, and then flows out from the cold plate water outlet 14, so that the heat on the liquid cooling plate 1 is taken away during the flow of the cooling water, and the heat exchange and heat dissipation effect is achieved.

[0038] Since the cold plate water inlet 13 is arranged at a position corresponding to the top of the first water passing cavity 11, and the cold plate water outlet 14 is arranged at a position corresponding to the top of the second water passing cavity 12, the liquid cooling plate 1 is filled with cooling liquid during the heat exchange process, and the temperature of the liquid in the first water passing cavity 11 at the high position is lower than the temperature of the liquid in the first water passing cavity 11 at the low position, so that the heat exchange and heat dissipation effect reaches the best state.

[0039] As preferred, in the embodiment, the flow channels in the first water passing cavity 11 and the second water passing cavity 12 are all seven, and the seven flow channels are arranged in parallel.

[0040] As preferred, in the embodiment, the liquid cooling plate 1 is provided with a battery cell limiting groove at each end for limiting the battery array.

[0041] The gravity equalizing plate 2 includes a vertical plate and a horizontal plate arranged in an L shape, the gravity equalizing plate 2 is arranged in pairs and back-to-back on the two sides of the liquid cooling plate 1, and the vertical plate of the gravity equalizing plate 2 is fixedly attached to the liquid cooling plate 1; a plurality of linearly arranged L-shaped micro-hole grooves 21 are arranged in the gravity equalizing plate 2. In actual working conditions, each gravity equalizing plate 2 is a cell 9 placing unit, when the cell 9 is placed on the gravity equalizing plate 2, the side surface of the cell 9 is attached to the vertical plate of the gravity equalizing plate 2, and the bottom surface of the cell 9 is attached to the horizontal plate of the gravity equalizing plate 2, the heat generated by the cell 9 is conducted to the liquid cooling plate 1 through the gravity equalizing plate 2 for heat exchange, so that the side surface and the bottom surface of the cell 9 are fully cooled.

[0042] It should be noted that the vertical plate and the horizontal plate of the gravity equalizing plate 2 are connected at a right angle to form an L shape, but the connection between the vertical plate and the horizontal plate can be a pure right angle or a right angle with a certain chamfer, the purpose is only to adapt to the edges and corners of the cell 9, and to ensure the fit of the gravity equalizing plate 2 and the cell 9.

[0043] Micro-porous groove 21, which has an L-shaped integral vertical and horizontal part, the vertical and horizontal parts of the micro-porous groove 21 correspond to the inside of the vertical and horizontal plates of the gravity equalization plate 2 respectively, and the horizontal part of the micro-porous groove 21 is pre-filled with liquid phase change working medium as refrigerant.

[0044] As preferred, in this embodiment, the liquid phase change working medium in the horizontal part of the micro-porous groove 21 can be freon, deionized water, ethanol or acetone, etc.; it should be noted that the injection amount of the phase change working medium is about 5%-40% of the cavity volume of each micro-porous groove 21, and the specific injection amount needs to be determined by experiment according to the power consumption of different battery cells 9 and different cross-sectional areas of the micro-porous groove 21, which is not a fixed value.

[0045] The inlet and outlet water flow channel frame 3 includes the inlet water flow channel beam 31 and the outlet water flow channel beam 32 arranged horizontally and spaced apart, and a plurality of liquid cooling limiting groove plates 33 vertically and spaced apart connected between the inlet water flow channel beam 31 and the outlet water flow channel beam 32; the number of liquid cooling limiting groove plates 33 corresponds to the number of liquid cooling plates 1, and the liquid cooling limiting groove plates 33 are provided with limiting grooves along the long direction thereof, and the liquid cooling limiting groove plates 33 can limit and fix the liquid cooling plates 1 on the inlet and outlet water flow channel frame 3.

[0046] The inlet water flow channel beam 31 is a hollow beam, and the intersection connection between the inlet water flow channel beam 31 and each liquid cooling limiting groove plate 33 is provided with an inlet water docking port 311, and each inlet water docking port 311 is in communication with the cooling plate water inlet 13 on each liquid cooling plate 1, so that the inner cavity of the inlet water flow channel beam 31 is in communication with the first water passing cavity 11 of each liquid cooling plate 1.

[0047] The outlet water flow channel beam 32 is a hollow beam, and the intersection connection between the outlet water flow channel beam 32 and each liquid cooling limiting groove plate 33 is provided with an outlet water docking port 321, and each outlet water docking port 321 is in communication with the cooling plate water outlet 14 on each liquid cooling plate 1, so that the inner cavity of the outlet water flow channel beam 32 is in communication with the second water passing cavity 12 of each liquid cooling plate 1.

[0048] Further, the inlet water flow channel beam 31 is further provided with an external main inlet water port 312, and the external main inlet water port 312 is provided with a water nozzle, and the external main inlet water port 312 is used for connecting an external water inlet pipeline.

[0049] Further, the outlet water flow channel beam 32 is further provided with an external main outlet water port 322, and the external main outlet water port 322 is provided with a water nozzle, and the external main outlet water port 322 is used for connecting an external water outlet pipeline.

[0050] It should be noted that the liquid cooling device of the case can be extended or shortened according to the actual number of battery cells 9 in the battery pack, and the number of liquid cooling plates 1 and the number of corresponding gravity equalizing plates 2 are increased or decreased, so that the capacity of the liquid cooling device of the case is adjustable, and the expansion process of the whole liquid cooling device is simple and the assembly is flexible and convenient.

[0051] As preferred, in the embodiment, the water nozzle in the external main water inlet 312 and the external main water outlet 322 is connected with the water inlet and outlet channel frame 3 by welding; the liquid cooling plate 1 is welded with the water inlet and outlet channel frame 3 through the liquid cooling limiting groove plate 33; the gravity equalizing plate 2 is welded with the liquid cooling plate 1, and the width of the horizontal plate of the two gravity equalizing plates 2 located at the outermost side of the whole battery pack is greater than the width of the horizontal plate of the other gravity equalizing plates 2 inside the whole battery pack.

[0052] The working principle or process of the battery pack liquid cooling device with the gravity equalizing plate 2 of the case is as follows:

[0053] 1. The whole heat transfer path can be described as follows: the heat generated by the battery cell 9 is transferred to the phase change working medium in the horizontal plate of the gravity equalizing plate 2 through heat conduction, the phase change working medium vaporizes after absorbing heat, and rises along the vertical plate of the gravity equalizing plate 2, and then transfers heat to the wall surface of the gravity equalizing plate 2 through convection heat exchange, and then transfers heat to the wall surface of the liquid cooling plate 1 through heat conduction, and finally transfers heat to the liquid in the liquid cooling plate 1 through convection heat exchange, and then the heat is taken out of the liquid cooling system by the circulating liquid cooling medium in the liquid cooling plate 1, so as to achieve the heat dissipation effect of the combination of phase change heat transfer and liquid cooling heat exchange.

[0054] 2. The vertical plate of the gravity equalizing plate 2 is attached to the liquid cooling plate 1, and since the water inlet side of the inner cavity of the liquid cooling plate 1 is the first water passing cavity 11 at a high position, and the water outlet side is the second water passing cavity 12 at a low position, the temperature of the high position is lower than that of the low position, which can ensure that the phase change working medium in the gravity equalizing plate 2 completes the vapor-liquid phase change at a higher position to a greater extent; the liquefied medium in the vertical plate of the gravity equalizing plate 2 returns to the horizontal plate of the gravity equalizing plate 2 under the action of gravity, continues to absorb the temperature of the battery cell 9 for phase change, and completes a new round of phase change cycle.

[0055] Compared with the prior art, the battery pack liquid cooling device with the gravity equalizing plate 2 of the case combines the phase change heat transfer of the gravity equalizing plate with the liquid cooling heat exchange of the liquid cooling plate, and the L-shaped gravity equalizing plate can contact the bottom surface and the side surface of the battery cell, so that the heat dissipation efficiency is high.

[0056] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not therefore be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the utility model concept, several deformations and improvements can be made, which belong to the protection range of the utility model.

Claims

1. A battery pack liquid cooling device with gravity equalization plates, characterized in that: a plurality of liquid cooling plates (1) are vertically erected and spaced apart in the direction of gravity, and a plurality of gravity equalization plates (2) are attached to the two sides of each liquid cooling plate (1) in a vertical manner; the liquid cooling plate (1) is kept in an upright position by a water inlet and outlet channel frame (3) connected to the first end thereof and is connected to the water inlet and outlet channels; a first water passing cavity (11) and a second water passing cavity (12) are arranged in the liquid cooling plate (1) in a vertically communicating manner, a plurality of parallel flow channels are arranged in the first water passing cavity (11) and the second water passing cavity (12) respectively; a cold plate water inlet (13) is arranged at the first end of the liquid cooling plate (1) near the top position, the cold plate water inlet (13) is connected to the first water passing cavity (11); a cold plate water outlet (14) is arranged at the first end of the liquid cooling plate (1) at a position slightly above the middle, the cold plate water outlet (14) is connected to the second water passing cavity (12); the gravity equalization plate (2) comprises a vertical plate and a horizontal plate arranged in an L shape, the gravity equalization plates (2) are attached to the two sides of the liquid cooling plate (1) in a back-to-back manner, and the vertical plate of the gravity equalization plate (2) is fixedly attached to the liquid cooling plate (1); a plurality of linearly arranged L-shaped micro-hole grooves (21) are arranged in the gravity equalization plate (2) in a corresponding manner. The micro-hole groove (21) has an L-shaped vertical part and a horizontal part which are integrally connected, the vertical part and the horizontal part of the micro-hole groove (21) are arranged in the vertical plate and the horizontal plate of the gravity equalization plate (2) respectively, and the horizontal part of the micro-hole groove (21) is pre-filled with liquid phase change working medium as refrigerant. The water inlet and outlet channel frame (3) comprises a water inlet channel beam (31) and a water outlet channel beam (32) arranged in a horizontal and spaced apart manner, and a plurality of liquid cooling limiting groove plates (33) vertically and spaced apart connected between the water inlet channel beam (31) and the water outlet channel beam (32); the number of the liquid cooling limiting groove plates (33) corresponds to the number of the liquid cooling plates (1). The water inlet channel beam (31) is a hollow beam, the water inlet channel beam (31) and each liquid cooling limiting groove plate (33) are connected at the intersection, and the water inlet channel beam (31) is provided with a water inlet docking port (311) penetrating through the intersection, each water inlet docking port (311) is connected to the cold plate water inlet (13) of each liquid cooling plate (1) in a corresponding manner, so that the inner cavity of the water inlet channel beam (31) is connected to the first water passing cavity (11) of each liquid cooling plate (1). The water outlet channel beam (32) is a hollow beam, the water outlet channel beam (32) and each liquid cooling limiting groove plate (33) are connected at the intersection, and the water outlet channel beam (32) is provided with a water outlet docking port (321) penetrating through the intersection, each water outlet docking port (321) is connected to the cold plate water outlet (14) of each liquid cooling plate (1) in a corresponding manner, so that the inner cavity of the water outlet channel beam (32) is connected to the second water passing cavity (12) of each liquid cooling plate (1).

2. The battery pack liquid cooling device with gravity equalizing plate according to claim 1, characterized in that: The water inlet channel beam (31) is further provided with an external main water inlet (312), and the external main water inlet (312) is provided with a water nozzle.

3. The battery pack liquid cooling device with gravity equalizing plate according to claim 2, characterized in that: The water outlet channel beam (32) is further provided with an external main water outlet (322), and the external main water outlet (322) is provided with a water nozzle.

4. The battery pack liquid cooling device with gravity equalizing plate according to claim 3, characterized in that: ​ 5. The battery pack liquid cooling device with gravity equalizing plate according to claim 4, characterized in that: ​ 6. The battery pack liquid cooling device with gravity equalizing plate according to claim 5, characterized in that: ​ 7. The battery pack liquid cooling device with gravity equalizing plate according to claim 6, characterized in that: ​ 8. The battery pack liquid cooling device with gravity equalizing plate according to claim 2, characterized in that: The gravity equalization plate (2) is welded with the liquid cooling plate (1), and the width of the horizontal plate of the two gravity equalization plates (2) located at the outermost side of the whole battery pack is greater than the width of the horizontal plate of the other gravity equalization plates (2) inside the whole battery pack.

9. The battery pack liquid cooling device with gravity equalizing plate according to claim 2, characterized in that: Both ends of the liquid cooling plate (1) are provided with cell limiting grooves.

10. The battery pack liquid cooling device with gravity equalizing plate according to claim 2, characterized in that: The flow channels in the first water passing cavity (11) and the second water passing cavity (12) are all seven.

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