CN217158308U

CN217158308U - Liquid cooling power battery system and electric automobile

Info

Publication number: CN217158308U
Application number: CN202122618752.2U
Authority: CN
Inventors: 赵长河; 李鸿键; 侯艳丽; 李玉军
Original assignee: Beijing Shengneng Energy Technology Co Ltd
Current assignee: Zhuji Gcl Technology Development Co ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-08-09
Anticipated expiration: 2031-10-28

Abstract

The utility model relates to an electric automobile technical field discloses a liquid cooling power battery system and electric automobile. The liquid cooling power battery system comprises a plurality of battery packs and a liquid cooling pipe assembly. Each battery pack has a coolant inlet and a coolant outlet; the liquid cooling pipe assembly comprises a liquid feeding pipe, a liquid separator, a liquid return pipe, a liquid collector and a plurality of branch pipelines, the liquid feeding pipe is communicated with the inlet of the liquid separator, the liquid return pipe is communicated with the outlet of the liquid collector, the branch pipelines are communicated between the liquid separator and the liquid collector in parallel, a battery pack is communicated in each branch pipeline, the height of the liquid separator is not lower than the inlet of the cooling liquid of the battery pack located at the highest position, the height of the liquid collector is not higher than the cooling liquid outlet of the battery pack located at the lowest position, or the height of the liquid separator is not higher than the cooling liquid inlet of the battery pack located at the lowest position, and the height of the liquid collector is not lower than the outlet of the cooling liquid of the battery pack located at the highest position. This electric automobile includes foretell liquid cooling power battery system. The safety performance of the electric automobile is higher.

Description

Liquid cooling power battery system and electric automobile

Technical Field

The utility model relates to an electric automobile technical field especially relates to a liquid cooling power battery system and electric automobile.

Background

Along with the specific technical route of the power battery system, iteration is performed, the cooling mode of the battery system is also changed continuously, and the liquid cooling mode is generally applied to people at the present stage. The liquid cooling mode is mainly characterized in that low-temperature cooling liquid and a high-temperature battery are subjected to heat exchange to take away the heat of the battery, so that the working temperature of the battery is not too high, and the working life of the battery is ensured. The battery cooling system not only reduces the overhigh working temperature of the battery system, but also considers the difference requirements of the highest temperature and the lowest temperature of the system. In order to meet the requirement of temperature difference, when a flow channel of a cooling system of a single battery pack is designed, the problem of flow distribution in the flow channel needs to be considered. However, the existing liquid cooling system is difficult to ensure that the flow in each flow channel is consistent, the ratio of the lowest flow to the highest flow can only reach about 80%, the influence on the temperature difference inside the battery is large, if the flow uniformity needs to be improved, each branch joint needs to be subjected to throttling treatment respectively, the design and simulation processes are complex, and the design period is long; and the joints are subjected to inner diameter throttling treatment, so that the joint is excessive in variety, non-uniform in size, non-universal in parts and high in incoming material and production management cost. Meanwhile, the height and the position of each battery pack of different vehicle types are different, so that the flow of the whole battery system is more difficult to be uniformly distributed.

SUMMERY OF THE UTILITY MODEL

Based on above, an object of the utility model is to provide a liquid cooling power battery system and electric automobile, the pipeline is arranged easily and feasibly, and spare part can realize generally, and coolant liquid flow distribution is comparatively even, and the battery system difference in temperature is less, and power battery system and electric automobile security performance are higher.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a liquid-cooled power cell system, comprising:

a plurality of battery packs, each of the battery packs having a coolant inlet and a coolant outlet;

the liquid cooling pipe assembly comprises a liquid feeding pipe, a liquid separator, a liquid returning pipe, a liquid collector and a plurality of branch pipelines, wherein the liquid feeding pipe is communicated with the inlet of the liquid separator, the liquid returning pipe is communicated with the outlet of the liquid collector, the branch pipelines are communicated with the liquid separator and the liquid collector in parallel, each branch pipeline is communicated with the battery pack, the height of the liquid separator is not lower than the highest position, the inlet of the cooling liquid of the battery pack is provided, the height of the liquid collector is not higher than the lowest position, the outlet of the cooling liquid of the battery pack is provided, or the height of the liquid separator is not higher than the lowest position, the inlet of the cooling liquid of the battery pack is provided, and the height of the liquid collector is not lower than the highest position, and the outlet of the cooling liquid of the battery pack is provided.

As a preferable embodiment of the liquid-cooled power battery system, each of the branch lines has an equal length.

In a preferred embodiment of the liquid-cooled power battery system, the number of battery packs in at most one of the branch lines is smaller than the number of battery packs in the other branch lines, and the number of battery packs in the other branch lines is the same.

As a preferable mode of the liquid-cooled power battery system, a throttle valve is provided in the branch line in which the number of the battery packs is smaller than the number of the battery packs in the other branch lines.

As a preferred scheme of a liquid cooling power battery system, still include:

and the liquid supplementing box is communicated with the liquid return pipe in parallel through a pipeline.

As a preferred scheme of the liquid cooling power battery system, each battery pack is provided with a temperature sensor.

As a preferable scheme of the liquid-cooled power battery system, each branch pipeline is provided with a flow sensor.

As a preferred scheme of a liquid cooling power battery system, still include:

the water pump is communicated with the liquid feeding pipe.

As a preferred scheme of a liquid cooling power battery system, still include:

and the water regulating valve is arranged in the liquid feeding pipe.

An electric automobile, includes above-mentioned arbitrary technical scheme liquid cooling power battery system.

The utility model has the advantages that:

the utility model provides a liquid cooling power battery system and electric automobile, this liquid cooling power battery system include a plurality of battery packages and liquid cooling pipe assembly. Carry the coolant liquid to the knockout through sending the liquid pipe is concentrated, the coolant liquid flows into each lateral conduit through the knockout in, cool off the battery package in the lateral conduit, then the coolant liquid of every lateral conduit collects to the liquid trap in, discharge by the liquid return pipe through the liquid trap is concentrated, through setting up knockout and liquid trap, the dismouting of the liquid cooling pipe subassembly of being convenient for is used, and be convenient for spare part universalization, reduce production and administrative cost, be convenient for simultaneously be suitable for arranging of the liquid cooling pipe subassembly of the electric automobile of different motorcycle types. Through the design to the height of knockout and knockout for when coolant liquid was collected to the liquid trap in to each lateral conduit and from each lateral conduit by the knockout in, the flow can distribute comparatively evenly, reduces the cold volume difference in each lateral conduit, reduces power battery system's temperature difference promptly, can reduce the flow resistance simultaneously, thereby improves energy utilization efficiency and power battery security. Under the structure, the pressure difference at the two ends of each branch pipeline is equal, so that the uniformity of the flow distribution of the cooling liquid can be effectively improved, and the safety of the power battery pack is improved. The electric automobile adopting the liquid cooling power battery system has higher safety.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a schematic structural view of a liquid-cooled power battery system in which the number of battery packs provided by the embodiment of the present invention is 4;

fig. 2 is a schematic structural view of a liquid-cooled power battery system in which the number of battery packs provided by the embodiment of the present invention is 3;

fig. 3 is a schematic structural diagram of a liquid cooling power battery system assembled on a frame according to an embodiment of the present invention.

In the figure:

1. a battery pack;

2. a liquid cooling tube assembly; 21. a liquid delivery pipe; 22. a liquid separator; 23. a liquid return pipe; 24. a liquid collector; 25. a branch line;

3. a liquid replenishing box; 4. a frame; 5. liquid cooling unit.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1 and 2, the present embodiment provides a liquid-cooled power battery system including a plurality of battery packs 1 and a liquid-cooled pipe assembly 2. Each battery pack 1 is provided with a cooling liquid inlet and a cooling liquid outlet, the liquid cooling pipe assembly 2 comprises a liquid feeding pipe 21, a liquid distributor 22, a liquid return pipe 23, a liquid collector 24 and a plurality of branch pipelines 25, the liquid feeding pipe 21 is communicated with the inlet of the liquid distributor 22, the liquid return pipe 23 is communicated with the outlet of the liquid collector 24, the branch pipelines 25 are communicated between the liquid distributor 22 and the liquid collector 24 in parallel, each branch pipeline 25 is communicated with the battery pack 1, the height of the liquid distributor 22 is not lower than the inlet of the cooling liquid of the battery pack 1 at the highest position, the height of the liquid collector 24 is not higher than the cooling liquid outlet of the battery pack 1 at the lowest position, or the height of the liquid distributor 22 is not higher than the cooling liquid inlet of the battery pack 1 at the lowest position, and the height of the liquid collector 24 is not lower than the outlet of the cooling liquid of the battery pack 1 at the highest position. Carry coolant liquid to knockout 22 through liquid sending pipe 21 is concentrated, the coolant liquid flows into each branch pipeline 25 through knockout 22, cool off battery package 1 in the branch pipeline 25, then the coolant liquid of every branch pipeline 25 collects to in the liquid trap 24, concentrate by liquid return pipe 23 through liquid trap 24 and discharge, through setting up knockout 22 and liquid trap 24, be convenient for the dismouting of liquid cooling pipe subassembly 2 to use, and be convenient for spare part universalization, reduce production and administrative cost, be convenient for be suitable for arranging of the liquid cooling pipe subassembly 2 of the electric automobile of different motorcycle types simultaneously. Through the design of the height of the liquid separator 22 and the height of the liquid collector 24, when the cooling liquid is separated into the branch pipelines 25 by the liquid separator 22 and collected into the liquid collector 24 from the branch pipelines 25, the flow can be distributed uniformly, the cold quantity difference in the branch pipelines 25 is reduced, namely, the temperature difference of the power battery system is reduced, and meanwhile, the flow resistance can be reduced, so that the energy utilization efficiency and the safety of the power battery are improved. With the above structure, the pressure difference between both ends of each branch line 25 is equal, and the uniformity of the coolant flow distribution can be effectively improved, thereby improving the safety of the power battery pack 1.

Alternatively, the liquid distributor 22 is an N-way valve, and the liquid collector 24 is an N-way valve, which is convenient and easy to obtain, and universal parts can be adopted. Preferably electrically operated valves, to facilitate control of the opening or closing thereof.

Preferably, the liquid trap 24 is located above the liquid separator 22. That is, in the height direction of the vehicle, the height of the liquid separator 22 is less than or equal to the height of the coolant inlet of the lowest battery pack 1, the height of the liquid collector 24 is greater than or equal to the height of the coolant outlet of the highest battery pack 1, the coolant flows into the respective branch pipes 25 from bottom to top, and the overall flow direction of the coolant is from bottom to top. In this embodiment, as shown in fig. 3, the liquid cooling unit 5 is used for conveying the cooling liquid to the liquid cooling pipe assembly 2, the cooling liquid is pumped and circulated by a water pump, the water pump is connected between the liquid conveying pipe 21 and the liquid cooling unit 5, and a liquid return port of the liquid cooling unit 5 is connected to the liquid return pipe 23. The water pump can provide sufficient power and carry the coolant liquid from bottom to top smoothly. The provision of the liquid separator 22 at the lower side can reduce the influence of gravity on the flow rate of the coolant that is branched into each branch pipe 25, so that the coolant can be pumped into each branch pipe 25 as uniformly as possible.

Preferably, a water regulating valve is provided in the liquid sending pipe 21, and the flow rate of the coolant can be regulated by the water regulating valve.

Specifically, each branch line 25 is equal in length. When the battery pack 1 is arranged in an automobile, the arrangement positions are different, in order to improve the flow distribution uniformity of the cooling liquid in each branch pipeline 25, so that the lengths of each branch pipeline 25 are equal, the flow resistance difference in each branch pipeline 25 can be reduced, and under the condition that the pressure difference of each branch pipeline 25 is equal, the flow difference in each branch pipeline 25 is smaller, so that the safety performance of the power battery pack 1 is improved. In a specific embodiment, a specific arrangement may be designed according to the distribution position of the battery packs 1 as long as the total length of each branch pipe 25 is equal.

In one embodiment, if the flow resistance in each battery pack 1 is the same, the number of battery packs 1 on at most one branch line 25 is smaller than the number of battery packs 1 on the other branch lines 25, and the number of battery packs 1 on the other branch lines 25 is the same. The same quantity of battery packs 1 in the branch pipelines 25, then the flow resistance in the branch pipelines 25 is the same, and the pressure difference, the length and the flow resistance of each branch pipeline 25 are equal, namely the coolant flow in each branch pipeline 25 is equal, so that the coolant flow uniformity of the whole power battery system is maximized, and the safety of the power battery is greatly improved. Meanwhile, under the structure, simulation design is not needed to be carried out on each branch pipeline 25, a throttling device is not needed to be arranged in each branch pipeline 25, the sizes can be unified, the universality of parts is greatly improved, and the production and manufacturing cost and the design period are reduced. Illustratively, since the number of the battery packs 1 is not excessive in an actual application scenario, when the number of the battery packs 1 is an even number, two battery packs 1 are connected in series in each branch pipeline 25, and when the number of the battery packs 1 is an odd number, one battery pack 1 is communicated in one branch pipeline 25, the rest branch pipelines 25 are respectively connected in series with two battery packs 1, or each branch pipeline 25 is respectively communicated with one battery pack 1, so that it is ensured that the temperature difference of each battery pack 1 is not excessive. Illustratively, the power battery system is composed of 3 standard packs, 3 battery packs 1 are connected in parallel through 3 branch pipelines 25, and the flow ratio of the lowest branch pipeline 25 to the highest branch pipeline 25 is 98.7% through CFD fluid simulation, so that the uniformity of the cooling liquid flow distribution can be effectively ensured by designing the

liquid distributors

22 and 24 and enabling the branch pipelines 25 to be equal in length and flow resistance. Of course, in other embodiments, a plurality of battery packs 1 may be connected in series in each branch line 25 according to actual conditions to adapt to different input powers and application scenarios.

In another embodiment, if there are different types of battery packs 1, it is only necessary to ensure that the flow resistances in the respective branch lines 25 are equal or differ slightly. Illustratively, when the power battery system is composed of four standard packs of 2C and 2G, C1 and G1 are connected in series in one branch line 25, and C2 and G2 are connected in series in the other branch line 25, so as to ensure equal flow resistance in the two branch lines 25, and thus, ensure uniform flow distribution. Under the above structure, the CFD flow simulation shows that the flow ratio in the two branch lines 25 is 99.4%, and it can be seen that the uniformity of the divided coolant flow can be effectively ensured by designing the

liquid distributors

22 and 24 and making the lengths of the branch lines 25 equal and the flow resistances equal.

Preferably, a throttle valve is provided in the branch line 25 in which the number of battery packs 1 is smaller than the number of battery packs 1 on the other branch lines 25. The flow resistance of the branch pipeline 25 is equal to the flow resistance of other branch pipelines 25, so that the flow is equal, and the temperature distribution uniformity of the power battery system is ensured.

Further, this liquid cooling power battery system still includes fluid infusion case 3, and fluid infusion case 3 passes through pipeline parallel connection and communicates in liquid return pipe 23, and the aforesaid coolant liquid is held in fluid infusion case 3. When the coolant liquid in the liquid cooling pipe assembly 2 takes place to leak or reduce, open fluid infusion case 3, fluid infusion case 3 supplements the coolant liquid to in the liquid cooling pipe assembly 2, guarantees that the coolant liquid measure in the liquid cooling pipe assembly 2 is enough to the assurance is to power battery system's cooling, improves the safety guarantee. In this embodiment, the one end of fluid infusion case 3 communicates in liquid trap 24, improves compact structure nature, need not additionally to increase the three-way valve and connects.

Further, each battery pack 1 is provided with a temperature sensor, and each branch line 25 is provided with a flow sensor. The liquid cooling power battery system further comprises a controller and a signal receiver, the controller is connected with the water pump, the liquid supplementing tank 3, the water regulating valve and the like, the signal receiver is connected with the temperature sensor and the flow sensor, the temperature sensor and the flow sensor detect the temperature of the battery pack 1 and the flow in the branch pipeline 25, signals are transmitted to the signal receiver, the signal receiver communicates with the operating terminals such as the handle, the knob and the change-over switch in a wireless mode, and the signals sent by the operating terminals such as the handle, the knob and the change-over switch are received. In this embodiment, the controller may be a centralized or distributed controller, for example, the controller may be a single-chip microcomputer or may be formed by a plurality of distributed single-chip microcomputers, and a control program may be run in the single-chip microcomputers to control the water pump, the fluid infusion tank 3, the water regulating valve, and the like to realize functions thereof, and to adjust the circulation condition of the cooling liquid in the liquid cooling pipe assembly 2.

As shown in fig. 3, the embodiment further provides an electric vehicle, which includes the above liquid-cooled power battery system. Liquid cooling power battery system sets up in frame 4, and liquid cooling pipe assembly 2 intercommunication liquid cooling unit 5, and liquid cooling unit 5 sets up in frame 4. The liquid cooling power battery system in the adoption is suitable for series-parallel connection and can be applied to battery packs 1 of different vehicle types or different quantities. When the arrangement of the liquid cooling pipe assemblies 2 is designed, the liquid distributors 22 and the liquid collectors 24 are only required to be fixed at the highest height and the lowest height of the water inlet and the water outlet of the whole power battery system, throttling design and simulation of each branch are not required, and the design period can be effectively shortened; the liquid distributor 22 and the liquid collector 24 can adopt a universal joint design, so that the types of joints are reduced, and the incoming material and production management cost is reduced; meanwhile, the safety of the electric automobile can be effectively improved.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A liquid-cooled power cell system, comprising:

a plurality of battery packs (1), each battery pack (1) having a coolant inlet and a coolant outlet;

liquid cooling pipe assembly (2), including liquid sending pipe (21), knockout (22), liquid return pipe (23), liquid trap (24) and a plurality of branch pipeline (25), liquid sending pipe (21) communicate in the import of knockout (22), liquid return pipe (23) communicate in the export of liquid trap (24), a plurality of branch pipeline (25) parallelly connected communicate in between knockout (22) and liquid trap (24), communicate in every branch pipeline (25) battery package (1), the height of knockout (22) is not lower than the import of the coolant liquid of battery package (1) that is located the highest place, the height of liquid trap (24) is not higher than the coolant liquid export of battery package (1) that is located the lowest place, or the height of knockout (22) is not higher than the coolant liquid import of battery package (1) that is located the lowest place, the height of the liquid collector (24) is not lower than the outlet of the cooling liquid of the battery pack (1) positioned at the highest position.

2. A liquid-cooled power cell system according to claim 1, characterised in that each of the branch lines (25) is of equal length.

3. A liquid-cooled power cell system according to claim 1, characterised in that the number of battery packs (1) on at most one of the branch lines (25) is smaller than the number of battery packs (1) on the other branch lines (25), and the number of battery packs (1) on the other branch lines (25) is the same.

4. A liquid-cooled power cell system according to claim 3, characterised in that a throttle is provided in the branch line (25) in which the number of battery packs (1) is smaller than the number of battery packs (1) in the other branch lines (25).

5. The liquid-cooled power cell system of claim 1, further comprising:

and the liquid supplementing box (3) is communicated with the liquid return pipe (23) in parallel through a pipeline.

6. The liquid-cooled power battery system according to claim 1, characterized in that a temperature sensor is provided on each battery pack (1).

7. A liquid-cooled power cell system according to claim 1, characterised in that one flow sensor is arranged on each branch line (25).

8. The liquid-cooled power cell system of claim 1, further comprising:

and the water pump is communicated with the liquid sending pipe (21).

9. The liquid-cooled power cell system of claim 1, further comprising:

and a water regulating valve disposed in the liquid feeding pipe (21).

10. An electric vehicle comprising the liquid-cooled power battery system of any one of claims 1-9.