CN220042026U - Liquid cooling subassembly and battery package - Google Patents

Abstract

The utility model discloses a liquid cooling assembly and a battery pack, comprising: the liquid cooling plate comprises at least one first liquid cooling module and at least one second liquid cooling module, and the first liquid cooling module and the second liquid cooling module comprise a plurality of liquid cooling runners which are connected in parallel; the liquid cooling plate is provided with a liquid inlet and a liquid outlet, the first liquid cooling module is arranged on one side close to the liquid inlet and the liquid outlet, and the second liquid cooling module is arranged on one side far away from the liquid inlet and the liquid outlet; the liquid inlet is communicated with the first liquid cooling module and the second liquid cooling module, and the second liquid cooling module is communicated with the liquid outlet; the flow velocity of the cooling liquid in the liquid cooling flow channel of the first liquid cooling module is larger than that of the cooling liquid in the liquid cooling flow channel of the second liquid cooling module. According to the utility model, the flow rate of the cooling liquid of the first liquid cooling module is larger than that of the cooling liquid of the second liquid cooling module, so that the cooling liquid in the liquid cooling flow channel far away from the liquid inlet and the liquid outlet can have more time and fully contact with the battery core, the cooling effect is ensured, and the situation of local overheating of the battery is avoided.

Description

Liquid cooling subassembly and battery package

Technical Field

The utility model relates to the technical field of battery production and manufacturing, in particular to a liquid cooling assembly and a battery pack.

Background

As the energy density of battery packs increases, liquid cooling technology is becoming the dominant battery thermal management solution. The heat of the battery is transferred to the cooling liquid through the liquid cooling plate, and the cooling liquid takes away the heat so as to achieve the purpose of cooling the battery pack. The flow channel design and the structural design of the liquid cooling assembly can directly influence the heating capacity, the cooling capacity and the temperature equalizing capacity of the battery pack, and the structural design of the liquid cooling assembly has larger influence on the overall structural strength and the mode of the battery pack.

As the charge of the battery pack increases, the size of the battery pack gradually increases, and the size of the liquid cooling plate also increases. This can make the liquid cooling runner lengthen, and the flow resistance of coolant liquid increases in the liquid cooling board to the inhomogeneous phenomenon of temperature of coolant liquid appears in different regions in the liquid cooling board easily, and then has the risk that leads to the battery to appear local overheated, thereby reduces battery performance, influences the duration of battery package. And the temperature of the cooling liquid in the liquid cooling runner of the liquid inlet is higher, and under the condition that the flow speed of the liquid cooling runner is the same, the heat exchange effect of the cooling liquid in the liquid cooling runner of the liquid inlet to the battery core is poor, the battery is easy to be locally overheated, and the battery performance is influenced.

Disclosure of Invention

In order to overcome at least one of the above-mentioned drawbacks of the prior art, the present utility model provides a liquid cooling assembly and a battery pack, comprising: the liquid cooling plate comprises a flat plate attached to the battery core and a runner plate attached to the flat plate, at least one first liquid cooling module and at least one second liquid cooling module are defined between the runner plate and the flat plate, and each of the first liquid cooling module and the second liquid cooling module comprises a plurality of liquid cooling runners connected in parallel; the liquid cooling plate is provided with a liquid inlet and a liquid outlet, the first liquid cooling module is arranged on one side close to the liquid inlet and the liquid outlet, and the second liquid cooling module is arranged on one side far away from the liquid inlet and the liquid outlet; the liquid inlet is communicated with the first liquid cooling module and the second liquid cooling module, and the second liquid cooling module is communicated with the liquid outlet; the flow velocity of the cooling liquid in the liquid cooling flow channel of the first liquid cooling module is larger than that of the cooling liquid in the liquid cooling flow channel of the second liquid cooling module.

In the process, cooling liquid enters the liquid cooling flow channel of the first liquid cooling module from the liquid inlet to exchange heat with the first liquid cooling module, and meanwhile, cooling liquid enters the liquid cooling flow channel of the second liquid cooling module from the liquid inlet to exchange heat with the second liquid cooling module.

The first liquid cooling module and the second liquid cooling module comprise a plurality of liquid cooling channels which are connected in parallel, so that cooling liquid is split, overlong liquid cooling channels which are connected in series are avoided, and the flowing resistance of the cooling liquid is increased.

It should be noted that the first liquid cooling module is close to the liquid inlet and the liquid outlet, the second liquid cooling module is far away from the liquid inlet and the liquid outlet, and the flow velocity of the cooling liquid in the liquid cooling flow channel of the first liquid cooling module is greater than the flow velocity of the cooling liquid in the liquid cooling flow channel of the second liquid cooling module. It is easy to understand that the temperature of the cooling liquid in the liquid cooling flow channel far away from the liquid inlet and the liquid outlet is high, so that more heat exchange time is needed, the cooling liquid is fully contacted with the battery cell, and the cooling effect is ensured.

Therefore, the flow rate of the cooling liquid in the liquid cooling flow channel of the first liquid cooling module is larger than that of the cooling liquid in the liquid cooling flow channel of the second liquid cooling module, so that the cooling liquid in the liquid cooling flow channel far away from the liquid inlet and the liquid outlet can have more time to fully contact with the battery core, the cooling effect is ensured, the risk of local overheating of the battery is avoided, and the battery performance is improved.

It should be further noted that the flow channel plate has a plurality of parallel cavities protruding away from the direction of the electric core, and the surfaces of the cavities adjacent to the flat plate define a first liquid cooling module and a second liquid cooling module. One surface of the flat plate facing the battery core is constructed into a flat molded surface so as to improve the fitting degree of the liquid cooling plate and the battery core and further improve the heat dissipation effect. Preferably, the liquid cooling plate comprises two first liquid cooling modules connected in parallel and two second liquid cooling modules connected in parallel. In other embodiments, the number and layout of the first liquid cooling module and the second liquid cooling module may be different according to the actual requirements.

Therefore, the liquid cooling plate with the flow channel plates and the flat plates for limiting the liquid cooling flow channels can improve the fitting degree of the liquid cooling plate and the battery core, so that the heat dissipation effect is improved, the overall thickness of the liquid cooling plate can be reduced, the structure of the liquid cooling plate is more compact, the weight of the liquid cooling plate can be effectively reduced, and space support is provided for battery capacity expansion.

In some embodiments, the liquid-cooled runner comprises: the first flow passage is communicated with the liquid inlet and any liquid cooling flow passage in the first liquid cooling module; the second flow passage is communicated with the liquid inlet and any liquid cooling flow passage in the second liquid cooling module; the second flow passage flows through the periphery of the first liquid cooling module.

In the process, the cooling liquid enters the first flow channel and the second flow channel from the liquid inlet respectively, and the cooling liquid entering the first flow channel is further divided into a plurality of parallel liquid cooling flow channels in the first liquid cooling module, so that heat exchange is performed on the first liquid cooling module, and the cooling liquid entering the second flow channel is further divided into a plurality of parallel liquid cooling flow channels in the second liquid cooling module, so that heat exchange is performed on the second liquid cooling module.

In some embodiments, a spoiler is further disposed in the first flow channel and/or the second flow channel.

In the utility model, the plurality of turbulence blocks are arranged in the first flow channel and/or the second flow channel, and are distributed along the extending direction of the first flow channel and/or the second flow channel, and the area where the turbulence blocks are positioned forms a semi-closed turbulence area, so that the cooling liquid entering the turbulence area flows out after being blocked from laminar flow to turbulent flow, thereby improving the turbulence state of the cooling liquid in the first flow channel and/or the second flow channel, improving the flow velocity of the cooling liquid, and further improving the heat exchange efficiency.

It should be noted that, according to the utility model, by setting different numbers of turbulence blocks for the first flow channel and/or the second flow channel, the flow rate of the cooling liquid is regulated and controlled, so that the flow rate of the cooling liquid of the first liquid cooling module close to the liquid inlet is larger than that of the cooling liquid of the second liquid cooling module far away from the liquid inlet, and the cooling liquid in the second liquid cooling module can have more time to fully contact with the battery core, so as to ensure the cooling effect, avoid the risk of local overheating of the battery, and further realize the heat exchange uniformity of the first liquid cooling module and/or the second liquid cooling module.

In some embodiments, the liquid cooling channels of the first liquid cooling module and the second liquid cooling module are the same or different in shape; the number of the liquid cooling flow channels of the first liquid cooling module and the second liquid cooling module is the same or different.

The liquid cooling channels in each liquid cooling module may be identical or different in layout, and the specific layout may be adjusted according to the heat dissipation requirement of the battery.

In some embodiments, the liquid-cooled runner comprises one of a serpentine runner, or a straight runner.

Specifically, in a single liquid cooling module, different liquid cooling flow channels have different shapes, and specific arrangement can be adjusted according to the heat dissipation requirement of the battery.

In some embodiments, the liquid cooling plate is disposed on the top or side of the battery cell in a fitting manner.

The liquid cooling plate is arranged at the top or the side surface of the battery core, so that the load of the liquid cooling plate is reduced, and the deformation and failure of the liquid cooling plate are prevented; therefore, the utility model can improve the strength of the liquid cooling plate while improving the cooling effect of the liquid cooling plate on the battery so as to prevent the deformation failure of the liquid cooling plate.

In some embodiments, a fastening structure is also provided between the flow channel plate and the planar plate.

The fastening structure is arranged between the flow channel plate and the flat plate, so that the strength of the liquid cooling plate is improved, and deformation and failure of the liquid cooling plate are prevented.

It should be emphasized that the liquid cooling plate of the present utility model adopts a composite six-system aluminum material. The existing liquid cooling plate generally adopts a composite three-system aluminum material, and the three-system aluminum material has the characteristics that: the aluminum alloy with manganese as the main alloy element can not be heat-treated and strengthened, has good corrosion resistance, can be called as rust-proof aluminum, and has good welding performance and good plasticity. The defect is that the strength is low, so that the bearing performance is poor, the liquid cooling plate is easy to deform, and the failure risk exists. The six-series aluminum material is characterized in that: magnesium and silicon are used as main materials, the strength is moderate, the coating is easy to coat, the processability is good, the welding performance is good, the technological performance is good, and the extrusion forming is easy.

The liquid cooling plate is made of the six-series aluminum material, so that the strength of the liquid cooling plate can be further increased, and the cooling and temperature equalizing effects on the battery cells are prevented from being influenced by deformation failure or deformation of the liquid cooling plate.

In some embodiments, the fastening structure includes fastening bolts provided at the ends of the flow field plates and the flat plate and no flow field.

Specifically, the runner plate and the plate of the liquid cooling plate are correspondingly provided with screw holes, and the runner plate and the plate are fixed through bolts, so that the overall strength, flatness and stability of the liquid cooling plate are further enhanced.

In some embodiments, the flow channel plate and the plate are brazed to each other; a plurality of shaping grooves are also arranged between the runner plate and the plate, and through holes are arranged on the shaping grooves.

Brazing is a method of joining with a welding material having a lower melting temperature than a base material, and joining is performed without melting the base material. The brazing is characterized in that: the brazing heating temperature is low, the joint is smooth and flat, the change of the structure and mechanical properties is small, the deformation is small, the workpiece size is accurate, the thickness difference of the workpiece is not strictly limited, the brazing equipment is simple, and the production investment cost is low.

In addition, in order to avoid bulging of the liquid cooling plate caused by too wide welding parts, a whole groove is further formed in the non-runner part of the runner plate, and a through hole is formed in the groove and used for allowing gas between the runner plate and the plate during welding to pass through. The arrangement can increase the production yield of the liquid cooling plate, thereby reducing the production cost.

In some embodiments, further comprising: the box, liquid cooling board and electric core set up in the box, and liquid cooling board and box pass through the colloid to be fixed.

It is to be noted that, the box includes epitheca and lower cover, prescribes a limit to between epitheca and the lower cover and constitute the holding chamber, and liquid cooling board and electric core set up in the holding intracavity, and liquid cooling board sets up between electric core and epitheca, and liquid cooling board is fixed through gluing with the epitheca to further increase the bulk strength and the stability in use of liquid cooling board, prevent that the liquid cooling board from deforming inefficacy.

In some embodiments, the liquid cooling plate further comprises a liquid inlet joint communicated with the liquid inlet and a liquid outlet joint communicated with the liquid outlet; the liquid inlet joint and the liquid outlet joint extend out of the box body, and sealing elements are arranged at the joints of the liquid inlet joint and the liquid outlet joint and the box body.

Specifically, each liquid cooling runner one end communicates in the inlet, and the other end communicates in the liquid outlet, and it can be understood that the inlet joint communicates in the inlet, and the outlet joint communicates in the liquid outlet.

It should be noted that the liquid inlet joint, the liquid outlet joint and the liquid cooling plate are fixedly connected by welding, integral molding or other processes. Therefore, the joint of the liquid inlet joint, the liquid outlet joint and the liquid cooling plate is free from the risk of liquid cooling leakage. The liquid inlet connector and the liquid outlet connector are arranged outside the box body in an extending mode, liquid cooling can be prevented from leaking inside the box body, and the battery is short-circuited due to the fact that cooling liquid contacts the battery, so that the safety of the battery can be improved.

It should also be noted that the seal can be a gasket, a rubber ring, or other structure having a sealing function. The liquid inlet connector and the connection part of the liquid inlet connector and the box body are respectively provided with a sealing piece, so that liquid cooling leakage is further prevented, and the situation that a battery is short-circuited due to the fact that cooling liquid contacts the battery is further prevented. The safety in utilization of product can be improved to the setting like this, effectively avoids the coolant liquid to reveal the risk that leads to the battery short circuit.

In some embodiments, further comprising: the liquid inlet pipeline is connected with the liquid inlet joint flange; the liquid outlet pipe is connected with the liquid outlet joint flange; the sealing element is a flange pad.

In some embodiments, further comprising: the pole is provided with a waterproof piece for avoiding liquid cooling leakage.

It is to be understood that, although the liquid inlet connector and the liquid outlet connector are arranged outside the box body in an extending way, and the sealing member is arranged to prevent the liquid cooling from leaking, in order to prevent the liquid cooling from leaking under extreme conditions, such as the conditions of impact and damage by external force, the waterproof member is arranged on the battery pole, so that the safety of the battery is further enhanced. The waterproof member can be a waterproof baffle, a waterproof cover or other structure capable of realizing the waterproof requirement of the pole.

In summary, the liquid cooling assembly and the battery pack provided by the utility model have the following technical effects:

(1) The first liquid cooling module and the second liquid cooling module comprise a plurality of liquid cooling channels which are connected in parallel, so that cooling liquid is split, overlong liquid cooling channels which are connected in series are avoided, and the flowing resistance of the cooling liquid is increased.

(2) According to the utility model, the flow rate of the cooling liquid in the liquid cooling flow channel of the first liquid cooling module is larger than that of the cooling liquid in the liquid cooling flow channel of the second liquid cooling module, so that the cooling liquid in the liquid cooling flow channel far away from the liquid inlet and the liquid outlet can have more time to fully contact with the battery core, the cooling effect is ensured, the risk of local overheating of the battery is avoided, and the battery performance is improved.

(3) The liquid cooling plate with the flow channel plates and the plates for limiting the liquid cooling flow channels can improve the bonding degree of the liquid cooling plate and the battery core, so that the heat dissipation effect is improved, the overall thickness of the liquid cooling plate can be reduced, the structure of the liquid cooling plate is more compact, the weight of the liquid cooling plate can be effectively reduced, and space support is provided for battery capacity expansion.

(4) According to the utility model, the flow rate of the cooling liquid is regulated and controlled by arranging different numbers of turbulence blocks on the first flow channel and/or the second flow channel, so that the flow rate of the cooling liquid of the first liquid cooling module close to the liquid inlet is larger than that of the cooling liquid of the second liquid cooling module far away from the liquid inlet, and the cooling liquid in the second liquid cooling module can have more time to fully contact with the battery core, so that the cooling effect is ensured, the risk of local overheating of the battery is avoided, and the heat exchange uniformity of the first liquid cooling module and/or the second liquid cooling module can be realized.

Drawings

FIG. 1 is a schematic perspective view of a case;

FIG. 2 is a schematic diagram of the installation of a liquid cooled assembly within a tank;

FIG. 3 is an enlarged partial schematic view of FIG. 2A;

FIG. 4 is a schematic diagram of a configuration in which a liquid cooling assembly is disposed at the top of a cell;

FIG. 5 is a schematic cross-sectional view of the liquid inlet and outlet connectors.

Wherein the reference numerals have the following meanings:

1. a battery pack; 11. a battery cell;

2. a liquid cooling assembly; 20. a first liquid cooling module; 21. a second liquid cooling module; 22. a liquid cooling runner; 221. a first flow passage; 222. a second flow passage; 23. a liquid inlet; 24. a liquid outlet; 25. a spoiler;

3. a liquid cooling plate; 31. a flow channel plate; 32. a flat plate; 33. a liquid inlet joint; 34. a liquid outlet joint;

4. a fastening structure;

5. a shaping groove; 51. a through hole;

6. a case; 61. an upper case; 62. a lower cover;

7. a seal;

81. a liquid inlet pipe; 82. and a liquid outlet pipeline.

Detailed Description

For a better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model.

In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

Referring to fig. 2 and 3, a liquid cooling assembly 2 includes: the liquid cooling plate 3, the liquid cooling plate 3 includes a flat plate 32 attached to the battery 11 and a runner plate 31 attached to the flat plate 32, at least one first liquid cooling module 20 and at least one second liquid cooling module 21 are defined between the runner plate 31 and the flat plate 32, and the first liquid cooling module 20 and the second liquid cooling module 21 each include a plurality of liquid cooling runners 22 connected in parallel; the liquid cooling plate 3 is provided with a liquid inlet 23 and a liquid outlet 24, the first liquid cooling module 20 is arranged at one side close to the liquid inlet 23 and the liquid outlet 24, and the second liquid cooling module 21 is arranged at one side far away from the liquid inlet 23 and the liquid outlet 24; the liquid inlet 23 is communicated with the first liquid cooling module 20 and the second liquid cooling module 21, and the second liquid cooling module 21 is communicated with the liquid outlet 24; the flow rate of the cooling liquid in the liquid cooling flow passage 22 of the first liquid cooling module 20 is greater than the flow rate of the cooling liquid in the liquid cooling flow passage 22 of the second liquid cooling module 21.

In the process, the cooling liquid enters the liquid cooling flow channel 22 of the first liquid cooling module 20 from the liquid inlet 23 to exchange heat with the first liquid cooling module 20, and meanwhile, the cooling liquid enters the liquid cooling flow channel 22 of the second liquid cooling module 21 from the liquid inlet 23 to exchange heat with the second liquid cooling module 21.

The first liquid cooling module 20 and the second liquid cooling module 21 of the utility model both comprise a plurality of liquid cooling flow channels 22 which are connected in parallel, so that the cooling liquid is divided, the overlong serial liquid cooling flow channels 22 are avoided, the flowing resistance of the cooling liquid is increased, the phenomenon that the temperature of the cooling liquid is uneven in different areas in the liquid cooling plate 3 is effectively avoided, the risk of local overheating of a battery is reduced, and the battery performance and the cruising ability of the battery pack 1 are improved.

It should be noted that the first liquid cooling module 20 is disposed near the liquid inlet 23 and the liquid outlet 24, the second liquid cooling module 21 is disposed far away from the liquid inlet 23 and the liquid outlet 24, and the flow rate of the cooling liquid in the liquid cooling channel 22 of the first liquid cooling module 20 is greater than the flow rate of the cooling liquid in the liquid cooling channel 22 of the second liquid cooling module 21. It will be appreciated that because the temperature of the cooling liquid in the liquid cooling flow channel 22 away from the liquid inlet 23 and the liquid outlet 24 is higher, more heat exchange time is required to make the cooling liquid fully contact with the battery cell 11, and the cooling effect is ensured.

Therefore, the flow rate of the cooling liquid in the liquid cooling flow channel 22 of the first liquid cooling module 20 is greater than the flow rate of the cooling liquid in the liquid cooling flow channel 22 of the second liquid cooling module 21, so that the cooling liquid in the liquid cooling flow channel 22 far away from the liquid inlet 23 and the liquid outlet 24 can have more time to fully contact with the battery cell 11, thereby ensuring the cooling effect, avoiding the risk of local overheating of the battery and improving the battery performance.

It should be further noted that the flow channel plate 31 has several parallel cavities protruding away from the cell 11, and the surfaces of the cavities adjacent to the flat plate 32 define the first liquid cooling module 20 and the second liquid cooling module 21. The surface of the flat plate 32 facing the battery cell 11 is configured into a flat molded surface so as to improve the fitting degree of the liquid cooling plate 3 and the battery cell 11, thereby improving the heat dissipation effect. Preferably, in this embodiment, the liquid cooling plate 3 includes two parallel first liquid cooling modules 20 and two parallel second liquid cooling modules 21. In other embodiments, the number and layout of the first liquid cooling module 20 and the second liquid cooling module 21 are different according to actual requirements.

In this way, the liquid cooling plate 3 of each liquid cooling runner 22 is defined by the runner plate 31 and the plate 32, so that the fitting degree of the liquid cooling plate 3 and the battery cell 11 can be improved, the heat dissipation effect can be improved, the overall thickness of the liquid cooling plate 3 can be reduced, the structure of the liquid cooling plate 3 is more compact, the weight of the liquid cooling plate 3 can be effectively reduced, and space support is provided for battery expansion.

Referring to fig. 2 and 3, the liquid cooling flow passage 22 includes: a first flow channel 221 connected to the liquid inlet 23 and any one of the liquid cooling flow channels 22 in the first liquid cooling module 20; a second flow passage 222 connected to the liquid inlet 23 and any one of the liquid cooling flow passages 22 in the second liquid cooling module 21; the second flow passage 222 flows through the periphery of the first liquid cooling module 20.

In the process, the cooling liquid enters the first flow channel 221 and the second flow channel 222 from the liquid inlet 23, the cooling liquid entering the first flow channel 221 is further divided into a plurality of parallel liquid cooling flow channels 22 in the first liquid cooling module 20, so as to exchange heat with the first liquid cooling module 20, and the cooling liquid entering the second flow channel 222 is further divided into a plurality of parallel liquid cooling flow channels 22 in the second liquid cooling module 21, so as to exchange heat with the second liquid cooling module 21.

Referring to fig. 3, a spoiler 25 is further disposed in the first flow channel 221 and/or the second flow channel 222.

It should be noted that, in the present utility model, the plurality of turbulence blocks 25 are disposed in the first flow channel 221 and/or the second flow channel 222, and the plurality of turbulence blocks 25 are distributed along the extending direction of the first flow channel 221 and/or the second flow channel 222, so that a semi-closed turbulence area is formed in the area where the turbulence blocks 25 are located, and after the cooling liquid entering the turbulence area is blocked, the cooling liquid changes from laminar flow into turbulent flow and flows out, thereby improving the turbulence state of the cooling liquid in the first flow channel 221 and/or the second flow channel 222, improving the flow velocity of the cooling liquid, and further improving the heat exchange efficiency.

It should be further noted that, according to the present utility model, by providing the first flow channel 221 and/or the second flow channel 222 with different numbers of turbulence blocks 25, the flow rate of the cooling liquid is regulated and controlled, so that the flow rate of the cooling liquid of the first liquid cooling module 20 close to the liquid inlet 23 is greater than the flow rate of the cooling liquid of the second liquid cooling module 21 far from the liquid inlet 23, so that the cooling liquid in the second liquid cooling module 21 can have more time to fully contact with the battery 11, thereby ensuring the cooling effect, avoiding the risk of local overheating of the battery, and further realizing the uniformity of heat exchange of the first liquid cooling module 20 and/or the second liquid cooling module 21.

Referring to fig. 2, the shapes of the liquid cooling channels 22 of the first liquid cooling module 20 and the second liquid cooling module 21 are the same or different; the number of liquid cooling channels 22 of the first liquid cooling module 20 and the second liquid cooling module 21 is the same or different.

The liquid cooling channels 22 in each liquid cooling module may be identical or different in layout, and the specific layout may be adjusted according to the heat dissipation requirement of the battery.

In this embodiment, the liquid cooling plate 3 includes two parallel first liquid cooling modules 20 and two parallel second liquid cooling modules 21, and the widths of the liquid cooling channels 22 of the two first liquid cooling modules 20 are larger than those of the liquid cooling channels 22 of the two second liquid cooling modules 21, and the number of the liquid cooling channels 22 of the two first liquid cooling modules 20 is smaller than that of the liquid cooling channels 22 of the two second liquid cooling modules 21, so as to regulate and control the flow rate of cooling liquid, and make the flow rate of cooling liquid of the first liquid cooling modules 20 close to the liquid inlet 23 be larger than that of cooling liquid of the second liquid cooling modules 21 far away from the liquid inlet 23, so that cooling liquid in the second liquid cooling modules 21 can have more time to fully contact with the electric core 11, so as to ensure the cooling effect.

Referring to fig. 2, the liquid cooling flow channel 22 includes one of a serpentine flow channel, a serpentine flow channel or a straight flow channel.

Specifically, in a single liquid cooling module, different liquid cooling channels 22 have different shapes, and specific arrangement can be adjusted according to the heat dissipation requirement of the battery.

Referring to fig. 1, 2 and 4, the liquid cooling plate 3 is attached to the top or side of the battery 11.

The liquid cooling plate 3 is arranged at the top or the side surface of the battery cell 11, so that the load of the liquid cooling plate 3 is lightened, and the deformation and failure of the liquid cooling plate 3 are prevented; therefore, the utility model can improve the strength of the liquid cooling plate 3 to prevent the deformation and failure of the liquid cooling plate 3 while improving the cooling effect of the liquid cooling plate 3 on the battery.

Preferably, in the present embodiment, the liquid cooling plate 3 is disposed on top of the cell 11.

Referring to fig. 2, 3 and 4, a fastening structure 4 is further disposed between the flow channel plate 31 and the plate 32.

The fastening structure 4 is arranged between the flow channel plate 31 and the flat plate 32, so that the strength of the liquid cooling plate 3 is improved, and the deformation and failure of the liquid cooling plate 3 are prevented.

It should be emphasized that the liquid cooling plate 3 of the present utility model is made of a composite six-system aluminum material. The existing liquid cooling plate 3 is usually made of a composite three-system aluminum material, and the three-system aluminum material has the characteristics that: the aluminum alloy with manganese as the main alloy element can not be heat-treated and strengthened, has good corrosion resistance, can be called as rust-proof aluminum, and has good welding performance and good plasticity. The disadvantage is that the strength is low, so that the bearing capacity is poor, the liquid cooling plate 3 is easy to deform, and the failure risk exists. The six-series aluminum material is characterized in that: magnesium and silicon are used as main materials, the strength is moderate, the coating is easy to coat, the processability is good, the welding performance is good, the technological performance is good, and the extrusion forming is easy.

According to the utility model, the liquid cooling plate 3 is made of six-series aluminum materials, so that the strength of the liquid cooling plate 3 can be further increased, and the cooling and temperature equalizing effects on the battery cells 11 due to deformation failure or deformation influence of the liquid cooling plate 3 are prevented.

Referring to fig. 2, 3 and 4, the fastening structure 4 includes fastening bolts disposed at the ends of the flow channel plate 31 and the flat plate 32 and at the non-flow channel position.

Specifically, screw holes are correspondingly formed in the runner plate 31 and the flat plate 32 of the liquid cooling plate 3, and the runner plate 31 and the flat plate 32 are fixed through bolts, so that the overall strength, flatness and stability of the liquid cooling plate 3 are further enhanced. Preferably, in this embodiment, the bolts are used to fix the runner plate 31 and the flat plate 32, and in other embodiments, different structures are used to fix the runner plate 31 and the flat plate 32 according to actual requirements, which will not be described herein.

Referring to fig. 2, 3 and 4, the flow field plate 31 and the flat plate 32 are brazed; a plurality of shaping grooves 5 are also arranged between the runner plate 31 and the plate 32, and through holes 51 are arranged on the shaping grooves 5.

In this embodiment, the flow channel plate 31 and the flat plate 32 are connected by brazing, and in other embodiments, the connection manner of the flow channel plate 31 and the flat plate 32 has different arrangements according to actual requirements.

Brazing is a method of joining with a welding material having a lower melting temperature than a base material, and joining is performed without melting the base material. The brazing is characterized in that: the brazing heating temperature is low, the joint is smooth and flat, the change of the structure and mechanical properties is small, the deformation is small, the workpiece size is accurate, the thickness difference of the workpiece is not strictly limited, the brazing equipment is simple, and the production investment cost is low.

In order to avoid bulging of the liquid cooling plate 3 due to an excessively wide welded portion, a whole groove 5 is provided in the non-flow path portion of the flow path plate 31, and a through hole 51 is provided in the groove, and the through hole 51 is used for passing gas between the flow path plate 31 and the flat plate 32 during welding. This arrangement can increase the yield of the liquid cooling plate 3, thereby reducing the production cost.

Referring to fig. 1, 2 and 4, in another aspect, the present utility model further includes a battery pack 1 including the above-mentioned liquid cooling assembly 2, further including: the box 6, the liquid cooling plate 3 and the battery cell 11 are arranged in the box 6, and the liquid cooling plate 3 and the box 6 are fixed through colloid.

Specifically, the box 6 includes upper shell 61 and lower cover 62, prescribes a limit to between upper shell 61 and the lower cover 62 and constitute the holding chamber, and liquid cooling board 3 and electric core 11 set up in the holding intracavity, and liquid cooling board 3 sets up between electric core 11 and upper shell 61, and liquid cooling board 3 is fixed through gluing with upper shell 61 to further increase the bulk strength and the stability in use of liquid cooling board 3, prevent that liquid cooling board 3 from deforming inefficacy.

Referring to fig. 1, 4 and 5, the liquid cooling plate 3 further includes a liquid inlet connector 33 connected to the liquid inlet 23 and a liquid outlet connector 34 connected to the liquid outlet 24; the liquid inlet joint 33 and the liquid outlet joint 34 extend out of the box body 6, and a sealing piece 7 is arranged at the joint of the liquid inlet joint 33 and the liquid outlet joint 34 and the box body 6.

Specifically, one end of each liquid cooling flow channel 22 is connected to the liquid inlet 23, and the other end is connected to the liquid outlet 24, and it is understood that the liquid inlet connector 33 is connected to the liquid inlet 23, and the liquid outlet connector 34 is connected to the liquid outlet 24.

It should be noted that, the liquid inlet connector 33, the liquid outlet connector 34 and the liquid cooling plate 3 are fixedly connected by welding, integral molding or other processes. Therefore, the joint of the liquid inlet joint 33, the liquid outlet joint 34 and the liquid cooling plate 3 is not in risk of liquid cooling leakage. The liquid inlet connector 33 and the liquid outlet connector 34 are arranged outside the box body 6 in an extending mode, liquid cooling can be prevented from leaking into the box body 6, and the battery is short-circuited due to the fact that cooling liquid contacts the battery, so that the safety of the battery can be improved.

It should be noted that the sealing member 7 can be a gasket, a rubber ring, or other structures having a sealing function. The sealing pieces 7 are arranged at the joints of the liquid inlet connector 33, the liquid outlet connector 34 and the box body 6, so that liquid cooling leakage is further prevented, and the condition that a battery is short-circuited due to the fact that cooling liquid contacts the battery is further prevented. The safety in utilization of product can be improved to the setting like this, effectively avoids the coolant liquid to reveal the risk that leads to the battery short circuit.

Referring to fig. 1, 4 and 5, the method further includes: a liquid inlet pipe 81 flange-connected to the liquid inlet joint 33; a liquid outlet pipe 82 which is flange-connected to the liquid outlet joint 34; the seal 7 is a flange gasket.

Preferably, in the present embodiment, the liquid inlet pipe 81 is flange-connected to the liquid inlet joint 33, the liquid outlet pipe 82 is flange-connected to the liquid outlet joint 34, and a flange pad is provided as the sealing member 7, so that leakage of the cooling liquid is effectively prevented, and safety of the product is improved. It should be noted that the flange connection is to fix two ends of the pipe to be connected on one flange plate, then to add a flange pad between the two flange plates, and finally to tighten the two flange plates with bolts to tightly combine them. The flange connection is convenient to use, can bear great pressure, and the leakproofness is good, can effectively prevent that the liquid cooling from revealing.

Further comprises: the pole is provided with a waterproof piece for avoiding liquid cooling leakage.

It will be appreciated that although the present utility model is provided with the liquid inlet connector 33 and the liquid outlet connector 34 extending outside the case 6 and the sealing member 7 to prevent leakage of liquid cooling, in order to prevent leakage of liquid cooling caused by extreme conditions such as impact and damage by external force, a waterproof member is provided on the battery post to further enhance the safety of the battery. The waterproof member can be a waterproof baffle, a waterproof cover or other structure capable of realizing the waterproof requirement of the pole.

The first liquid cooling module 20 and the second liquid cooling module 21 of the utility model comprise a plurality of liquid cooling flow channels 22 which are connected in parallel, so that the cooling liquid is split, the overlong liquid cooling flow channels 22 which are connected in series are avoided, and the flow resistance of the cooling liquid is increased; in the utility model, the flow rate of the cooling liquid in the liquid cooling flow passage 22 of the first liquid cooling module 20 is larger than that in the liquid cooling flow passage 22 of the second liquid cooling module 21, so that the cooling liquid in the liquid cooling flow passage 22 far away from the liquid inlet 23 and the liquid outlet 24 can be fully contacted with the battery cell 11 for more time, thereby ensuring the cooling effect, avoiding the risk of local overheating of the battery, improving the battery performance and the cruising ability of the battery pack 1.

The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims (13)

1. A liquid cooling assembly (2), comprising:

the liquid cooling plate (3), the liquid cooling plate (3) comprises a flat plate (32) attached to the battery cell (11) and a runner plate (31) attached to the flat plate (32);

at least one first liquid cooling module (20) and at least one second liquid cooling module (21) are defined between the runner plate (31) and the flat plate (32), and the first liquid cooling module (20) and the second liquid cooling module (21) comprise a plurality of liquid cooling runners (22) which are connected in parallel;

the liquid cooling plate (3) is provided with a liquid inlet (23) and a liquid outlet (24), the first liquid cooling module (20) is arranged at one side close to the liquid inlet (23) and the liquid outlet (24), and the second liquid cooling module (21) is arranged at one side far away from the liquid inlet (23) and the liquid outlet (24);

the liquid inlet (23) is communicated with the first liquid cooling module (20) and the second liquid cooling module (21), and the second liquid cooling module (21) is communicated with the liquid outlet (24);

the flow rate of the cooling liquid in the liquid cooling flow channel (22) of the first liquid cooling module (20) is larger than the flow rate of the cooling liquid in the liquid cooling flow channel (22) of the second liquid cooling module (21).

2. The liquid cooling assembly (2) of claim 1 wherein the liquid cooling flow channel (22) comprises:

a first fluid passage (221) communicating with the fluid inlet (23) and any one of the fluid cooling passages (22) in the first fluid cooling module (20);

a second flow passage (222) connected to the liquid inlet (23) and any one of the liquid cooling flow passages (22) in the second liquid cooling module (21);

the second flow passage (222) flows through the periphery of the first liquid cooling module (20).

3. A liquid cooling module (2) according to claim 2, wherein a spoiler (25) is further provided in the first flow channel (221) and/or the second flow channel (222).

4. A liquid cooling module (2) according to any one of claims 1-3, wherein the liquid cooling channels (22) of the first liquid cooling module (20) and the second liquid cooling module (21) are identical or different in shape;

the number of liquid cooling channels (22) of the first liquid cooling module (20) and the second liquid cooling module (21) is the same or different.

5. The liquid cooling assembly (2) of claim 4 wherein the liquid cooling flow channel (22) comprises one of a serpentine flow channel, a serpentine flow channel or a straight flow channel.

6. A liquid cooling module (2) according to any one of claims 1-3 or 5, wherein the liquid cooling plate (3) is attached to the top or side of the battery cell (11).

7. A liquid cooling module (2) according to any one of claims 1-3 or 5, wherein a fastening structure (4) is further provided between the flow conduit plate (31) and the plate (32).

8. The liquid cooling module (2) according to claim 7, wherein the fastening structure (4) comprises fastening bolts provided at the ends and no flow channels of the flow channel plate (31) and the flat plate (32).

9. A liquid cooled module (2) according to any of claims 1-3 or 5 or 8, wherein said flow conduit plate (31) and said flat plate (32) are brazed;

a plurality of shaping grooves (5) are further arranged between the runner plate (31) and the flat plate (32), and through holes (51) are formed in the shaping grooves (5).

10. A battery pack (1) comprising a liquid cooled assembly (2) according to any one of claims 1-9, further comprising:

the battery pack comprises a box body (6), wherein the liquid cooling plate (3) and the battery cell (11) are arranged in the box body (6), and the liquid cooling plate (3) and the box body (6) are fixed through colloid.

11. A battery pack (1) according to claim 10, wherein the liquid cooling plate (3) further comprises a liquid inlet connector (33) connected to the liquid inlet (23) and a liquid outlet connector (34) connected to the liquid outlet (24);

the liquid inlet connector (33) and the liquid outlet connector (34) extend out of the box body (6), and a sealing piece (7) is arranged at the joint of the liquid inlet connector (33) and the liquid outlet connector (34) and the box body (6).

12. A battery pack (1) according to claim 11, further comprising:

a liquid inlet pipe (81) which is in flange connection with the liquid inlet joint (33);

a liquid outlet pipe (82) which is in flange connection with the liquid outlet joint (34);

the sealing element (7) is a flange gasket.

13. A battery pack (1) according to any one of claims 10-12, further comprising:

the pole is provided with a waterproof piece for avoiding liquid cooling leakage.