CN213752881U

CN213752881U - Vehicle cylindrical lithium battery module based on heat pipe and liquid cooling coupling heat dissipation

Info

Publication number: CN213752881U
Application number: CN202023072327.XU
Authority: CN
Inventors: 张莹; 曾琦; 马明; 徐勋; 杨常川; 肖刚; 刘遥; 赵金阳; 赵启晨
Original assignee: Nanchang University
Current assignee: Nanchang University
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-07-20
Anticipated expiration: 2030-12-18

Abstract

The utility model relates to a lithium battery module technical field especially relates to an automobile-used cylindrical lithium battery module based on heat pipe and liquid cooling coupling heat dissipation, including lithium cell group, heat dissipation aluminum plate, heat dissipation aluminum pipe, battery bottom plate and battery upper cover plate. Each two rows of batteries are fixed by two aluminum plates, the aluminum plates are separated from the batteries by insulated heat-conducting silica gel pads, and battery mounting holes are arranged on a lower bearing plate and an upper cover plate of each battery to fix the batteries; the upper ends of the heat pipes are attached to the heat dissipation aluminum plate at equal intervals, and the lower ends of the heat pipes penetrate through the limiting holes of the lower bearing plate to be in contact with the heat dissipation aluminum pipe; the whole battery pack module is subjected to glue filling treatment, and the shock absorption and flame retardance of the organic silicon foaming material are high. The stability of the whole battery can be kept, the influence on other batteries caused by accidents caused by faults of the single batteries can be effectively prevented, and the air-conditioning circulating cooling type liquid cooling system and the heating system can be adopted to conduct heat management on the battery module well.

Description

Vehicle cylindrical lithium battery module based on heat pipe and liquid cooling coupling heat dissipation

Technical Field

The utility model relates to a lithium battery module technical field, concretely relates to automobile-used cylindrical lithium battery module based on heat pipe and liquid cooling coupling heat dissipation.

Background

With the rapid development of new energy automobiles, cylindrical lithium batteries with high energy density, good consistency and mature technology are more widely regarded and applied. The heat dissipation performance and the temperature uniformity of the battery pack module have very important influences on the service performance and the service life of the battery and the safety of the battery. In the prior art, the main heat dissipation mode for the cylindrical battery module is cooling by adopting forced air cooling or an aluminum pipeline through which liquid flows.

At present, the energy density of cylindrical lithium batteries used by electric vehicles is increasing, and a more efficient and energy-saving power battery thermal management system is needed to improve the performance, the service life and the safety of a battery pack. The forced air cooling heat dissipation mode is low in cost, simple in structure and convenient to manage, but low in heat dissipation efficiency and poor in temperature uniformity, is generally applied to square batteries with low energy density and large heat dissipation area, and is not suitable for cylindrical batteries with high single energy density. The highest temperature of a lithium battery pack cooled by a liquid cooling heat dissipation mode can be generally controlled within a proper range, but the temperature difference of the whole battery pack is large, so that different batteries can be charged and discharged at different rates, and the performance of a battery pack is reduced. And the liquid risks leakage to affect the safety of the entire battery pack.

In summary, a single heat management mode is difficult to meet the current and future heat management requirements of electric vehicles, and reducing the temperature difference of the battery pack and isolating the battery pack module from the liquid cooling module are important aspects of future power lithium battery heat management research.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem who solves lies in the heat accumulation to the battery that traditional single heat management technique caused, the poor scheduling problem of temperature uniformity provides an automobile-used cylindrical lithium battery module based on heat pipe and liquid cooling coupling heat dissipation, effectively guarantees the temperature uniformity of battery, and the security improves the operating life of battery.

In order to realize the purpose of the utility model, the utility model discloses a cylindrical lithium battery module for vehicle based on heat pipe and liquid cooling coupling heat dissipation, which comprises a battery pack, a heat dissipation aluminum plate, a heat dissipation aluminum pipe, a heat pipe, a battery lower bearing plate and a battery upper cover plate, wherein the battery pack is a strip-shaped structure formed by connecting a plurality of cylindrical battery side walls, a groove for inserting batteries of adjacent battery packs is formed between adjacent batteries, and two sides of two groups of battery packs are clamped and fixed through the heat dissipation aluminum plate; the battery upper cover plate is arranged at the top of the battery pack, the bottom of the battery pack is arranged at the top of the battery lower bearing plate, a heat pipe limiting hole for the heat pipe to penetrate through is formed in the battery lower bearing plate, and the heat pipe is located on the outer side of the heat dissipation aluminum plate; the heat dissipation aluminum pipe is arranged below the battery lower bearing plate in an S-shaped structure, one end of the heat dissipation aluminum pipe is provided with a cooling liquid inlet, the other end of the heat dissipation aluminum pipe is provided with a cooling liquid outlet, and the upper surface of the middle part of the heat dissipation aluminum pipe is provided with a hollow part for inserting the bottom condensation section of the heat pipe; and the heat dissipation aluminum pipe is fixedly connected with the heat pipe through glue filling.

The battery lower bearing plate is made of an insulating material, and the upper surface of the battery lower bearing plate is provided with a positioning round hole matched with the shape of the bottom of the battery pack; and the bottom of the battery upper cover plate is provided with a positioning hole matched with the shape of the top of the battery pack.

And a heat-conducting silica gel pad is arranged between the heat-radiating aluminum plate and the battery pack and is of a wave-shaped protruding structure.

The inner wall of the heat dissipation aluminum plate is matched with the shape of the heat conduction silica gel pad, and the outer wall of the heat dissipation aluminum plate is of a straight plate structure.

The cooling liquid inlet and the cooling liquid outlet of the heat dissipation aluminum pipe are of cylindrical tubular structures, and the section of the pipe body of the heat dissipation aluminum pipe is of a square structure.

The heat pipe is a sintered liquid absorption core heat pipe, and heat conduction grease is coated at the joint of the heat pipe, the heat dissipation aluminum plate and the heat dissipation aluminum pipe.

The beneficial effects of the utility model reside in that:

1. the battery pack module and the cooling liquid module are separated, so that the risk of leakage of the cooling liquid is effectively prevented;

2. insulating glue is filled between the batteries, and insulating heat conduction structural glue is arranged between the batteries and the heat dissipation aluminum plate, so that the safety of the battery pack is effectively improved;

3. the whole battery pack is treated by glue filling, the flame retardant effect is very good, a battery monomer with thermal runaway can be effectively isolated, thermal diffusion is prevented, meanwhile, the battery pack has good shock absorption, the safety of the whole module is improved, and the battery pack is not overweight due to the low-density characteristic;

4. the heat pipe has good temperature uniformity, so that heat generated by the battery can be quickly conducted to the cooling liquid, the temperature uniformity and consistency of the battery pack can be effectively guaranteed, and the cycle life of a battery system is prolonged; meanwhile, the required flow of the cooling liquid is reduced, and the energy consumption of the liquid cooling system is reduced.

Drawings

FIG. 1 is an exploded view of the present invention;

FIG. 2 is a schematic view of the assembly structure of the present invention;

fig. 3 is a schematic structural diagram of a battery pack according to the present invention;

fig. 4 is a schematic perspective view of a lower battery carrier plate according to the present invention;

fig. 5 is a schematic perspective view of the upper cover plate of the battery of the present invention;

fig. 6 is a schematic perspective view of the heat-conducting silicone pad of the present invention;

fig. 7 is a schematic view of a three-dimensional structure of a middle heat dissipation aluminum plate of the present invention;

fig. 8 is a schematic perspective view of a heat dissipation aluminum pipe of the present invention;

fig. 9 is a technical route diagram of the middle liquid cooling system and the heating system of the present invention.

In the figure, 1, a battery upper cover plate; 101. positioning holes; 2. a heat dissipation aluminum plate; 3. a heat-conducting silica gel pad; 4. a heat pipe; 5. a battery pack; 6. a battery lower support plate; 601. positioning the circular hole; 602. a heat pipe limiting hole; 7. a heat dissipation aluminum pipe; 701. coolant inlet, 702, coolant outlet.

Detailed Description

The invention will be further described with reference to the following figures and examples:

see fig. 1-9.

The utility model discloses an automobile-used cylindrical lithium battery module based on heat pipe and liquid cooling coupling heat dissipation, as shown in fig. 1, 2, including group battery 5, heat dissipation aluminum plate 2, heat dissipation aluminum pipe 7, heat pipe 4, battery lower bearing plate 6 and battery upper cover plate 1, group battery 5 is the rectangular shape structure that is formed by connecting a plurality of columniform battery lateral walls, forms the recess that is used for the battery of adjacent group battery 5 to insert between the adjacent battery, two sets of both sides of group battery 5 are passed through heat dissipation aluminum plate 2 and are pressed from both sides tightly fixed; the battery upper cover plate 1 is arranged at the top of the battery pack 5, the bottom of the battery pack 5 is arranged at the top of the battery lower bearing plate 6, a heat pipe limiting hole 602 for the heat pipe 4 to pass through is arranged on the battery lower bearing plate 6, and the heat pipe 602 is positioned at the outer side of the heat dissipation aluminum plate 2; the heat dissipation aluminum pipe 7 is arranged below the battery lower bearing plate 6 in an S-shaped structure, one end of the heat dissipation aluminum pipe 7 is provided with a cooling liquid inlet 701, the other end of the heat dissipation aluminum pipe is provided with a cooling liquid outlet 702, and the upper surface of the middle part of the heat dissipation aluminum pipe 7 forms a hollow part for inserting a condensation section at the bottom of the heat pipe 4; the heat dissipation aluminum pipe 7 is fixedly connected with the heat pipe 4 through glue filling, and the battery pack 5 and the heat dissipation aluminum pipe 7 are separated through the battery lower bearing plate 6, so that the danger of leakage of cooling liquid is effectively prevented.

As shown in fig. 3, a plurality of battery packs 5 are provided, and a cross-row battery pack is exemplified by 96 cylindrical batteries in this example. The adopted battery takes a 21700 battery as an example, insulating glue is filled between the batteries, and insulating heat conduction structural glue is arranged between the batteries and the heat dissipation aluminum plate 2, so that the safety of the battery pack 5 is effectively improved.

Fig. 4 is a schematic structural diagram of a battery lower plate, and the material is a heat conductive plastic with insulation and good heat conductivity. The battery lower bearing plate 6 is provided with a heat pipe limiting hole 602 for the heat pipe 4 to pass through and a positioning round hole 601 for placing the battery pack 4, and is used for fixing the positions of the heat pipe 4 and the battery pack 5.

As shown in fig. 5, the upper cover plate is made of the same material as the lower battery supporting plate 6, and has a thinner thickness as the non-supporting plate, so as to reduce the weight of the whole module, and the battery pack 5 is fixed with the positioning circular hole 601 of the upper cover plate 1 through the lower battery supporting plate 6.

As shown in fig. 6, a structural schematic diagram of a single insulating and heat conducting silica gel pad is shown, and a wave-shaped structure can be sufficiently attached to the surface of the battery pack 5 to increase the heat transfer area, so as to accelerate the heat dissipation of the battery cell. Meanwhile, the elastic space of the heat-conducting silica gel pad 3 can be increased by adopting the wave-shaped raised structure, and the damage of various collisions and shakes on the battery can be effectively weakened.

As shown in fig. 7, the structural schematic diagram of the heat dissipation aluminum plate is shown, the inner side of the heat dissipation aluminum plate is completely attached to the heat conduction silica gel pad 3 in a wave shape, the outer side of the heat dissipation aluminum plate is in a straight plate structure, as shown in fig. 2, the heat pipes 4 are directly attached to the heat dissipation aluminum plate 2 coated with heat conduction silica gel, the upper end and the lower end of the heat dissipation aluminum plate 2 penetrate through the heat pipe limiting holes 602 of the battery lower bearing plate 6 and are inserted into the heat dissipation aluminum pipe 7, the wrapping boundary of the battery pack 5 adopts four equidistant heat pipes 4, the seven heat pipes 4 are clamped by the two heat dissipation.

As shown in fig. 8, which is a schematic structural diagram of a heat dissipation aluminum tube, a joint between a coolant inlet 701 and a coolant outlet 702 is sealed by a sealant and a heat shrink tube to prevent leakage, and an S-shaped pipeline is connected in series, so that flow is saved and energy consumption is reduced compared with a parallel pipeline.

The utility model also provides a technical method of above-mentioned liquid cooling system and heating system of lithium cell group, as shown in FIG. 9, the coolant liquid water pump passes through coolant liquid circulation circuit and carries the coolant liquid, as long as the temperature of coolant liquid is less than battery module, just can utilize the circulation flow of coolant liquid to cool off battery module. When the battery is at a low temperature and needs to be preheated, the cooling liquid flows through the PTC heater to be heated through the whole vehicle controller, and therefore the whole battery pack module is heated.

Above-mentioned only the utility model discloses a case, the quantity of heat pipe is required nimble variably according to demand battery capacity and radiating effect with regard to the position, also is applicable to more than the cylindrical group battery of different models simultaneously only do the embodiment of the utility model discloses a not consequently restrict the patent scope of the utility model, all utilize the utility model discloses the equivalent transform that the content of the description and the attached drawing did or direct or indirect application are in relevant technical field, all the same reason is included in the patent protection scope of the utility model.

Claims

1. The utility model provides an automobile-used cylindrical lithium battery module based on heat pipe and liquid cooling coupling heat dissipation which characterized in that: the battery pack is characterized by comprising a battery pack (5), heat dissipation aluminum plates (2), heat dissipation aluminum pipes (7), heat pipes (4), battery lower bearing plates (6) and a battery upper cover plate (1), wherein the battery pack (5) is of a strip-shaped structure formed by connecting a plurality of cylindrical battery side walls, a groove for inserting batteries of adjacent battery packs (5) is formed between every two adjacent batteries, and two sides of each two groups of battery packs (5) are clamped and fixed through the heat dissipation aluminum plates (2); the battery upper cover plate (1) is arranged at the top of the battery pack (5), the bottom of the battery pack (5) is placed at the top of the battery lower bearing plate (6), a heat pipe limiting hole (602) for the heat pipe (4) to pass through is formed in the battery lower bearing plate (6), and the heat pipe (4) is located on the outer side of the heat dissipation aluminum plate (2); the heat dissipation aluminum pipe (7) is arranged below the battery lower bearing plate (6) in an S-shaped structure, one end of the heat dissipation aluminum pipe (7) is provided with a cooling liquid inlet (701), the other end of the heat dissipation aluminum pipe is provided with a cooling liquid outlet (702), and a hollow part for inserting a condensation section at the bottom of the heat pipe (4) is formed in the upper surface of the middle part of the heat dissipation aluminum pipe; the heat dissipation aluminum pipe (7) is fixedly connected with the heat pipe (4) through glue filling.

2. The cylindrical lithium battery module for the vehicle based on the heat pipe and the liquid-cooled coupling heat dissipation of claim 1, wherein: the battery lower bearing plate (6) is made of an insulating material, and the upper surface of the battery lower bearing plate is provided with a positioning round hole (601) matched with the bottom of the battery pack (5) in shape; the bottom of the battery upper cover plate (1) is provided with a positioning hole (101) matched with the shape of the top of the battery pack (5).

3. The cylindrical lithium battery module for the vehicle based on the heat pipe and the liquid-cooled coupling heat dissipation of claim 1, wherein: the heat dissipation aluminum plate (2) and the battery pack (5) are arranged between the heat dissipation aluminum plate and the battery pack, and the heat conduction silica gel pad (3) is of a wave-shaped protruding structure.

4. The cylindrical lithium battery module for the vehicle based on the heat pipe and the liquid-cooled coupling heat dissipation of claim 3, wherein: the inner wall of the heat dissipation aluminum plate (2) is matched with the shape of the heat conduction silica gel pad (3), and the outer wall of the heat dissipation aluminum plate is of a straight plate structure.

5. The cylindrical lithium battery module for the vehicle based on the heat pipe and the liquid-cooled coupling heat dissipation of claim 1, wherein: a cooling liquid inlet (701) and a cooling liquid outlet (702) of the heat dissipation aluminum pipe (7) are of cylindrical tubular structures, and the section of a pipe body of the heat dissipation aluminum pipe (7) is of a square structure.

6. The cylindrical lithium battery module for the vehicle based on the heat pipe and the liquid-cooled coupling heat dissipation of claim 1, wherein: the heat pipe (4) is a sintered liquid absorption core heat pipe, and heat conduction grease is coated at the joint of the heat pipe (4) and the heat dissipation aluminum plate (2) and the heat dissipation aluminum pipe (7).