WO2020187005A1 - 电池包及其冷却系统 - Google Patents

电池包及其冷却系统 Download PDF

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Publication number
WO2020187005A1
WO2020187005A1 PCT/CN2020/077273 CN2020077273W WO2020187005A1 WO 2020187005 A1 WO2020187005 A1 WO 2020187005A1 CN 2020077273 W CN2020077273 W CN 2020077273W WO 2020187005 A1 WO2020187005 A1 WO 2020187005A1
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WO
WIPO (PCT)
Prior art keywords
cooling
cooling system
hole section
section
hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2020/077273
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English (en)
French (fr)
Inventor
谷燕龙
白雪玉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Priority to EP20772699.3A priority Critical patent/EP3923399B1/en
Publication of WO2020187005A1 publication Critical patent/WO2020187005A1/zh
Priority to US17/478,884 priority patent/US20220006140A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B23K2101/14—Heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/06—Fastening; Joining by welding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • This application relates to the technical field of energy storage devices, in particular to a battery pack and its cooling system.
  • the power battery can be cooled by water cooling, specifically by installing a cooling system in the battery pack.
  • the cooling system includes a collecting pipe and a cooling pipe, and the cooling pipe is connected with the collecting pipe to realize the communication between the two flow channels, so that the cooling liquid can circulate in the two flow channels, so as to realize the battery Cooling of the package.
  • the cooling pipeline is provided with a necking structure.
  • the necking structure forms a step and goes deep into the flanging hole.
  • the stamping operation is performed on part of the collecting pipe, and the stamped part will protrude from the rest of the vicinity to form a flanging hole.
  • the end of the flanging hole abuts against the step of the necking structure, and the necking structure is welded to the flanging hole, thereby realizing the connection between the collecting pipeline and the cooling pipeline.
  • the cooling pipeline when the cooling pipeline is equipped with a necking structure, the cooling pipeline needs to be processed by the necking processing equipment, which reduces the production efficiency of the cooling pipeline and the cooling system.
  • the flow resistance of the cooling liquid at the constricted structure of the cooling pipeline increases, which leads to an increase in the energy consumption of the water pump of the cooling system and reduces the energy utilization rate of the cooling system.
  • the embodiments of the present application provide a battery pack and its cooling system to solve the problem of low production efficiency and energy utilization of the cooling system in the prior art.
  • An embodiment of the application provides a cooling system for a battery pack, and the cooling system includes:
  • the collecting pipeline includes a body part, and the body part has a cooling channel;
  • Cooling pipeline the two ends of the cooling pipeline along the axial direction are provided with collecting pipelines, and the cooling pipeline is connected with the cooling channel of the collecting pipeline;
  • the body part is also provided with a mounting hole, and a limiting boss is arranged inside the mounting hole.
  • the limiting boss and the cooling pipeline abut, and the axial direction of the cooling pipeline is the width direction.
  • the cooling pipeline can collide with the limiting boss, so as to limit the cooling pipeline in the width direction to realize the cooling pipe
  • the connection between the circuit and the two collecting pipelines can limit the depth of the cooling pipeline extending into the installation hole through the limit boss.
  • there is no need to provide a necking structure on the cooling pipeline which can improve the production efficiency of the cooling system and avoid the cooling liquid flow resistance caused by the cooling pipeline setting the necking structure Increase, improve the energy utilization rate of the cooling system.
  • an embodiment of the present application also provides a battery pack, including:
  • the battery module includes multiple unit cells
  • the cooling system is the same as the above-mentioned embodiment; the cooling pipeline is arranged under the battery module, and the bottom of the battery module and the cooling pipeline are in contact with each other; wherein, the cooling system is used to cool the battery module.
  • FIG. 1 is a schematic diagram of a partial structure of a battery pack provided by this application in a specific embodiment
  • FIG 2 is a schematic structural diagram of the cooling system in Figure 1;
  • Figure 3 is a partial enlarged view of part I in Figure 2;
  • Fig. 4 is a schematic diagram of the structure of the blocking cover in Fig. 3;
  • Figure 5 is a top view of Figure 2;
  • Figure 6 is a sectional view taken along the line A-A of Figure 5;
  • Figure 7 is a partial enlarged view of part II in Figure 6;
  • Figure 8 is a schematic diagram of the structure of the collecting pipeline in Figure 2;
  • Figure 9 is a front view of Figure 8.
  • Figure 10 is a B-B sectional view of Figure 9;
  • Fig. 11 is a partial enlarged view of part III in Fig. 9.
  • Figure 1 is a partial structural diagram of the battery pack provided by this application in a specific embodiment
  • Figure 2 is a structural diagram of the cooling system in Figure 1
  • Figure 3 is a schematic diagram of the cooling system in Figure 2 Part I is a partial enlarged view
  • Figure 4 is a schematic diagram of the structure of the cover in Figure 3
  • Figure 5 is a top view of Figure 2
  • Figure 6 is a cross-sectional view along the line AA in Figure 5
  • Figure 7 is a partial enlarged view of Part II in Figure 6
  • Fig. 8 is a schematic diagram of the structure of the collecting pipeline in Fig. 2
  • Fig. 9 is a front view of Fig. 8
  • Fig. 10 is a cross-sectional view taken along line BB of Fig. 9
  • Fig. 11 is a partial enlarged view of part III in Fig.
  • An embodiment of the present application provides a battery pack and a cooling system thereof, wherein, as shown in FIG. 1, the battery pack includes a plurality of battery modules 4 stacked along its length direction L, and the battery module 4 includes a plurality of units battery.
  • the stacking direction of the battery module 4 is defined as the length direction L of the battery pack.
  • the battery pack also includes a casing (not shown in the figure), and each battery module 4 is located in the inner cavity of the casing.
  • the unit cells in the battery module 4 generate heat.
  • a cooling system is provided in the casing of the battery pack in this application. The cooling system is used to cool each battery module 4 in the battery pack.
  • the cooling system includes a plurality of cooling pipes 2 along the length direction L of the battery pack, and the cooling pipes 2 are parallel to each other and extend along the width direction W of the battery pack.
  • the axial direction of the cooling pipe 2 is the width direction W of the battery pack.
  • the width direction W of the battery pack is perpendicular to the length direction L.
  • the cooling pipe 2 may be a harmonica pipe, that is, as shown in FIG. 2, the outside of the harmonica pipe has a flat structure, and the inside of the harmonica pipe has a plurality of pipes distributed at intervals along the length direction L.
  • the cooling pipeline 2 is located below the battery module 4, and the bottom of the battery module 4 is connected with the flat cooling pipeline 2 so that the bottom of the battery module 4 and the cooling pipeline 2 can exchange heat.
  • the cooling system further includes two collecting pipes 1.
  • the two collecting pipes 1 are located at the two ends of the cooling pipe 2 in the width direction W, respectively.
  • the collecting pipe 1 has a cooling channel 111 extending in the longitudinal direction L inside.
  • the cooling channel 111 is used for the circulation of cooling liquid.
  • the pipe of the cooling pipe 2 communicates with the cooling flow passage 111.
  • One of the two collecting pipes 1 is provided with a liquid inlet 15 and a liquid outlet 16.
  • the cooling liquid When the cooling system is working, the cooling liquid enters the cooling flow channel 111 through the liquid inlet 15 and enters each cooling pipe 2 while flowing along the cooling flow channel 111.
  • the cooling liquid can cool the bottom of the unit cell while flowing in the cooling pipe 2, and the circulating cooling liquid is discharged from the cooling system through the liquid outlet 16.
  • connection between the collecting pipe 1 and the cooling pipe 2 is mainly achieved by improving the structure of the collecting pipe 1, so as to improve the working efficiency of the cooling system and the energy utilization rate of the cooling system.
  • the collecting pipe 1 includes a body portion 11.
  • the main body 11 has a cooling channel 111.
  • the main body 11 is also provided with a mounting hole 13.
  • the mounting hole 13 is used to connect the collecting pipe 1 and the cooling pipe 2.
  • a limiting boss 14 is provided inside the mounting hole 13, and the limiting boss 14 is used to offset the cooling pipeline 2. Offset means that the cooling pipe 2 abuts against the limiting boss 14.
  • the extending direction of the cooling pipe 2 is the width direction W of the battery pack.
  • the cooling pipe 2 can be offset against the limiting boss 14, so that the limiting boss 14 acts along the width direction W
  • the function of the limiting cooling pipeline 2 realizes the connection between the cooling pipeline 2 and the two collecting pipelines 1, and the limiting protrusion 14 can limit the depth of the cooling pipeline 2 extending into the mounting hole 13.
  • the necking structure means that after the end of the cooling pipe 2 is processed by the necking process, the opening corresponding to the end is reduced.
  • the mounting hole 13 includes a first hole section 131 and a second hole section 132 along the width direction W (the axial direction of the mounting hole 13 is the width direction W), wherein the second hole section 132 communicates with the cooling channel 111 of the main body 11. 10 and 11, the size of the first hole section 131 in the height direction H is greater than the size of the second hole section 132 in the height direction H, and the size of the first hole section 131 in the length direction L is also greater than that of the first hole section 131 in the length direction L.
  • the size of the two hole sections 132 along the height direction H is such that the above-mentioned limiting boss 14 is formed between the first hole section 131 and the second hole section 132.
  • the height direction H and the width direction W are perpendicular to each other. It should be noted that, as shown in FIG. 10, in the mounting hole 13, the first hole section 131 and the second hole section 132 are coaxial. Therefore, the above-mentioned first hole section 131 or the second hole section 132 extends along the height direction H
  • the size refers to the distance from the side wall of the corresponding hole segment to the axis of the mounting hole 13 along the height direction H.
  • the size of the first hole segment 131 or the second hole segment 132 along the length direction L refers to: Along the length direction L, it corresponds to the distance from the side wall of the hole section to the axis of the mounting hole 13.
  • the mounting hole 13 for installing the cooling pipe 2 in the collecting pipe 1 is a stepped hole, so that the above-mentioned limiting boss 14 can be formed on the inner wall of the mounting hole 13.
  • the installation section 21 of the cooling pipe 2 extends into the first hole section 131 of the installation hole 13, and abuts against the limiting boss 14, and the cooling pipe 2 is connected to the second hole section 132
  • the cooling pipe 2 communicates with the cooling channel 111.
  • the inner diameter of the first hole section 131 is the same as the outer diameter of the cooling pipe 2, or the inner diameter of the first hole section 131 is larger than the outer diameter of the cooling pipe 2, so that the cooling pipe 2
  • the outer wall is attached to and welded to the inner wall of the first hole section 131, while ensuring that the two are sealed to each other, reducing the possibility of coolant leakage between the outer wall of the cooling pipe 2 and the inner wall of the first hole section 131. Prevent the cooling pipe 2 from falling out of the first hole section 131 when the battery pack vibrates.
  • the inner wall of the second hole section 132 is flush with the inner wall of the cooling pipeline 2, that is, the inner diameter of the second hole section 132 is flush with the cooling pipeline
  • the inner diameter of 2 is the same.
  • the inner wall of the second hole section 132 is flush with the inner wall of the cooling pipe 2 and there is no stepped surface between the two, when the cooling liquid flows through, the flow resistance to the cooling liquid can be avoided, thereby reducing The energy loss during the flow of the cooling liquid improves the energy utilization rate of the cooling system, and at the same time, the stability of the flow of the cooling liquid can be improved, thereby ensuring the uniformity of the cooling effect.
  • the inner wall of the second hole section 132 is flush with the inner wall of the cooling pipe 2 and is not strictly aligned, as long as the inner walls of the two are substantially flush to reduce the flow resistance of the cooling liquid.
  • the first hole section 131 of the mounting hole 13 has a first side wall 131a.
  • the cooling channel 111 has a second side wall 111a.
  • the thickness of the first side wall 131a is greater than the thickness of the second side wall 111a.
  • the thickness of the second side wall 111a is the thickness of the main body 11. In the body portion 11, the wall thickness at the mounting hole 13 is greater than the wall thickness at the rest of the body portion 11. That is, at the mounting hole 13, the strength of the collecting pipe 1 at the mounting hole 13 can be improved by increasing the wall thickness. Therefore, the connection reliability of the collecting pipe 1 and the cooling pipe 2 in the radial direction is improved.
  • the first hole section 131 is also connected to a third hole section 133, and the third hole section 133 and the second hole section 132 are respectively located in the first hole.
  • the two ends of the segment 131 in the axial direction.
  • the third hole section 133 has a tapered structure with a gradually decreasing cross-sectional area.
  • the cooling pipe 2 is welded to the collecting pipe 1 through the mounting hole 13.
  • the outer wall of the cooling pipe 2 is welded to the inner wall of the mounting hole 13.
  • the third hole section 133 of the tapered structure can be conveniently welded.
  • the third hole section 133 can also be used to contain solder, thereby effectively improving the cooling pipeline 2 and the collecting pipeline. 1. Connection stability.
  • the main body portion 11 is provided with a raised portion 12 inside.
  • the protrusion 12 protrudes toward the inside of the main body 11 in the width direction W (the axial direction of the cooling pipe 2) and the height direction H.
  • the protruding portion 12 extends along the length direction L of the collecting pipe 1 and along the length direction L.
  • the protruding portion 12 is correspondingly provided with a plurality of mounting holes 13. Each mounting hole 13 extends along the width direction W, and each mounting hole 13 is used to connect with the corresponding cooling pipe 2.
  • the size of the mounting hole 13 in the width direction W can be increased, thereby increasing the length of the cooling pipe 2 and the mounting hole 13, which is beneficial to increase the two The reliability of the connection.
  • a circular arc transition between the convex portion 12 and the body portion 11, and the outer contour of the convex portion 12 is a circular arc shape. Since the protrusion 12 participates in enclosing the cooling channel 111 of the collecting pipe 1, the arrangement of this embodiment can prevent the cooling channel 111 from forming a bent position, thereby reducing the flow of cooling liquid in the cooling channel 111 The resistance of the cooling system increases the energy utilization rate of the cooling system, and improves the uniformity of the cooling liquid flowing in the cooling channel 111, thereby improving the uniformity of the cooling effect of the cooling system on the battery module 4.
  • the body portion 11 has a first bottom wall 112 and a second side wall 111 a.
  • the second side wall 111 a is a side wall close to the cooling pipe 2.
  • the protruding portion 12 is disposed on the first bottom wall 112 and the second side wall 111 a, and is located inside the body portion 11.
  • the protrusion 12 protrudes from the first bottom wall 112 and the second side wall 111a.
  • the mounting hole 13 is opened in the protrusion 12 in the body portion 11 by machining, instead of the prior art processing method of punching the mounting hole through a mold Therefore, there is no need to reserve the wall thickness of the punching die in the collecting pipe 1, so that the height of the mounting hole 13 can be reduced.
  • the collecting pipe 1 in the present application can be directly extruded, thereby improving the production efficiency of the collecting pipe 1, and making the chamfer at the bottom of the collecting pipe 1 smaller or without chamfering, thereby enabling further Lower the height of the mounting hole 13.
  • the mounting hole 13 in the present application is closer to the bottom of the battery pack, so that the cooling pipeline 2 is closer to the bottom of the battery pack, that is, the height of the entire cooling system in the battery pack can be reduced, and the battery can be improved. Pack energy density and group efficiency.
  • the two ends of the body portion 11 are provided with plugs 3.
  • the blocking cover 3 is used to block the cooling flow passage 111 along the length direction L, thereby preventing the cooling liquid from leaking from the end of the collecting pipe 1.
  • the blocking cover 3 includes a third side wall 31 and a second bottom wall 32, wherein the third side wall 31 is matched with the inner wall of the body portion 11 and welded.
  • the second bottom wall 32 can block the cooling channel 111.
  • the third side wall 31 is provided with an inner concave portion 311 that matches with the convex portion 12.
  • the inner concave portion 311 is recessed toward the inside of the plug 3, and the inner concave portion 311 and the convex portion 12 are attached and welded.
  • the structure of the blocking cover 3 is not limited to this, and can also be other structures.
  • the blocking cover 3 may be a flat plate structure, and the flat plate structure and the two ends of the body portion 11 along the length direction L are attached and welded.
  • the welding area of the plug 3 and the main body 11 is relatively large, which can improve the reliability of the connection between the two and prevent the plug 3 from being disconnected from the main body 11 under the action of hydraulic pressure.
  • the cooling pipe 2 includes an installation section 21 and a cooling section 22.
  • the installation section 21 extends into the installation hole 13, and the end of the installation section 21 abuts against the limiting boss 14.
  • the cooling section 22 is located outside the mounting hole 13.
  • the cross-sectional area of the installation section 21 is equal to the cross-sectional area of the cooling section 22.
  • the cross-sectional area of the installation section 21 and the cross-sectional area of the cooling section 22 are not equal in the strict sense of mathematics, as long as the cross-sectional areas of the two are approximately equal.
  • the cooling pipeline 2 may be an equal-diameter pipe, namely The outer diameter of the cross section perpendicular to the axial direction at each position on the cooling pipe 2 is equal in size.
  • the cooling pipe 2 can abut the limiting boss 14, therefore, there is no need to install the prior art on the cooling pipe 2
  • the necking structure in the cooling pipe 2 has the same cross-sectional area as the installation section 21 of the cooling pipe 2 and the cooling section 22, which can reduce the processing difficulty of the cooling pipe 2, improve production efficiency, and prevent the installation of the necking structure.
  • the flow resistance of the cooling liquid is increased, which improves the energy utilization rate of the cooling system.
  • an embodiment of the present application also provides a battery pack, which includes a battery module 4 and a cooling system.
  • the cooling system is used to cool the battery module 4, wherein the cooling system is the cooling system of any of the above embodiments. Since the cooling system has the above technical effects, the battery pack including the cooling system should also have corresponding technical effects, which will not be repeated here.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

本申请实施例提供一种电池包及其冷却系统，冷却系统包括：集流管路，包括本体部，所本体部具有冷却流道；冷却管路，沿轴向的两端均设置有集流管路，且冷却管路与集流管路的冷却流道均连通；本体部还开设有安装孔，安装孔内部设置有限位凸台，沿轴向，限位凸台与冷却管路相抵。通过在集流管路的安装孔内设置限位凸台，冷却管路与限位凸台相抵，起到沿宽度方向限位冷却管路的作用，实现冷却管路与两集流管路的连接，并通过限位凸台限制冷却管路伸入安装孔内的深度。在集流管路中设置限位凸台后，无需在冷却管路上设置缩口结构，从而提高冷却系统的工作效率，并避免冷却管路设置缩口结构后导致的冷却液流动阻力增加，提高冷却系统的能量利用率。

Description

电池包及其冷却系统
相关申请的交叉引用
本申请要求享有于2019年03月18日提交的名称为“电池包及其冷却系统”的中国专利申请201920344391.7的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及储能器件技术领域，尤其涉及一种电池包及其冷却系统。
背景技术
随着动力电池的日益发展，电池的能量密度在不断提升。然而，能量密度提升带来的问题是电池的发热量增大，因此对电池冷却系统的冷却效率要求越来越严格。动力电池可通过水冷的方式实现冷却，具体通过在电池包内设置冷却系统实现。该冷却系统包括集流管路和冷却管路，且冷却管路与集流管路连接，从而实现两者流道的连通，以使冷却液能够在两者的流道内流通，以此实现电池包的冷却。
目前，现有的集流管路与冷却管路相连时，需在集流管路内冲压翻边孔，而冷却管路设置缩口结构。该缩口结构处形成台阶，并深入翻边孔内。对集流管路的部分区域进行冲压操作，被冲压的部分会凸出附近其余部分而形成翻边孔。翻边孔的端部与该缩口结构的台阶相抵，并使得缩口结构与翻边孔焊接，从而实现集流管路与冷却管路之间的连接。但是，在冷却管路设置缩口结构时，冷却管路需要经过缩口加工设备加工处理，降低冷却管路与冷却系统的生产效率。同时，冷却液在冷却管路的缩口结构处的流动阻力增大，导致冷却系统的水泵耗能增大，降低冷却系统的能量利用率。
发明内容
有鉴于此，本申请实施例提供了一种电池包及其冷却系统，用以解决现有技术中冷却系统的生产效率和能量利用率较低的问题。
本申请实施例提供了一种电池包的冷却系统，冷却系统包括：
集流管路，集流管路包括本体部，本体部具有冷却流道；
冷却管路，冷却管路沿轴向的两端设置有集流管路，且冷却管路与集流管路的冷却流道均连通；
其中，本体部还开设有安装孔，安装孔内部设置有限位凸台，沿宽度方向，限位凸台与冷却管路相抵，冷却管路的轴向为宽度方向。
本申请中，通过在集流管路的安装孔内设置限位凸台，使得冷却管路能够与该限位凸台相抵，从而起到沿宽度方向限位冷却管路的作用，实现冷却管路与两集流管路之间的连接，并能够通过限位凸台限制冷却管路伸入安装孔内的深度。同时，在集流管路中设置限位凸台后，无需在冷却管路上设置缩口结构，从而能够提高冷却系统的生产效率，并能够避免冷却管路设置缩口结构后导致冷却液流动阻力增加，提高冷却系统的能量利用率。
另一方面，本申请实施例还提供一种电池包，包括：
电池模组，电池模组包括多个单元电池；
如上述实施例的冷却系统；冷却管路设置于电池模组的下方，电池模组的底部与冷却管路相互接触；其中，冷却系统用于冷却电池模组。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。
图1为本申请所提供电池包在一种具体实施例中的局部结构示意图；
图2为图1中冷却系统的结构示意图；
图3为图2中Ⅰ部分的局部放大图；
图4为图3中堵盖的结构示意图；
图5为图2的俯视图；
图6为图5的A-A向剖视图；
图7为图6中Ⅱ部分的局部放大图；
图8为图2中集流管路的结构示意图；
图9为图8的正视图；
图10为图9的B-B向剖视图；
图11为图9中Ⅲ部分的局部放大图。
在附图中，附图未必按照实际的比例绘制。
附图标记：
1-集流管路；
11-本体部；
111-冷却流道；
111a-第二侧壁；
112-第一底壁；
12-凸起部；
13-安装孔；
131-第一孔段；
131a-第一侧壁；
132-第二孔段；
133-第三孔段；
14-限位凸台；
15-进液口；
16-出液口；
2-冷却管路；
21-安装段；
22-冷却段；
3-堵盖；
31-第三侧壁；
311-内凹部；
32-第二底壁；
4-电池模组。
具体实施方式
为了更好的理解本申请的技术方案，下面结合附图对本申请实施例进行详细描述。
应当明确，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其它实施例，都属于本申请保护的范围。
在本申请实施例中使用的术语是仅仅出于描述特定实施例的目的，而非旨在限制本申请。在本申请实施例和所附权利要求书中所使用的单数形式的“一种”、“所述”和“该”也旨在包括多数形式，除非上下文清楚地表示其他含义。
应当理解，本文中使用的术语“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
需要注意的是，本申请实施例所描述的“上”、“下”、“左”、“右”等方位词是以附图所示的角度来进行描述的，不应理解为对本申请实施例的限定。此外，在上下文中，还需要理解的是，当提到一个元件连接在另一个元件“上”或者“下”时，其不仅能够直接连接在另一个元件“上”或者“下”，也可以通过中间元件间接连接在另一个元件“上”或者“下”。
请参考附图1至图11，其中，图1为本申请所提供电池包在一种具体实施例中的局部结构示意图；图2为图1中冷却系统的结构示意图；图3为图2中Ⅰ部分的局部放大图；图4为图3中堵盖的结构示意图；图5为图2的俯视图；图6为图5的A-A向剖视图；图7为图6中Ⅱ部分的局部放大图；图8为图2中集流管路的结构示意图；图9为图8的正视图；图 10为图9的B-B向剖视图；图11为图9中Ⅲ部分的局部放大图。
本申请实施例提供一种电池包及其冷却系统，其中，如图1所示，该电池包包括多个沿自身的长度方向L堆叠的电池模组4，该电池模组4包括多个单元电池。定义电池模组4的堆叠方向为电池包的长度方向L。同时，该电池包还包括壳体(图中未示出)，各电池模组4位于壳体的内腔。该电池包工作时，电池模组4中的单元电池发热，为了保证电池包在适宜温度下工作，本申请在电池包的壳体内设置冷却系统。该冷却系统用于冷却电池包中的各个电池模组4。
在一个实施例中，如图2所示，该冷却系统沿电池包的长度方向L包括多个冷却管路2，且各冷却管路2相互平行，并沿电池包的宽度方向W延伸。冷却管路2的轴向为电池包的宽度方向W。电池包的宽度方向W与长度方向L相垂直。其中，该冷却管路2可为口琴管，也即如图2所示，该口琴管外部为平板型结构，且其内部沿长度方向L具有多个间隔分布的管道。该冷却管路2位于电池模组4下方，且电池模组4的底部与平板型冷却管路2相连接，以使电池模组4的底部与冷却管路2之间实现热量交换。
在一个实施例中，该冷却系统还包括两个集流管路1。两个集流管路1分别位于冷却管路2沿宽度方向W的两个端部。集流管路1内部具有沿长度方向L延伸的冷却流道111。该冷却流道111用于冷却液流通。上述冷却管路2与集流管路1连接后，冷却管路2的管道与冷却流道111连通。两个集流管路1中的一者设置有进液口15和出液口16。
该冷却系统工作时，冷却液通过进液口15进入冷却流道111内，沿冷却流道111流动过程中进入各个冷却管路2。冷却液在冷却管路2流动的过程中，能够对单元电池的底部进行冷却，循环后的冷却液经出液口16排出冷却系统。
本申请中，主要通过改进集流管路1的结构来实现集流管路1与冷却管路2之间的连接，从而提高冷却系统的工作效率，并提高冷却系统的能量利用率。
在一个实施例中，如图7和图10所示，该集流管路1包括本体部 11。该本体部11具有冷却流道111。同时，该本体部11还开设有安装孔13。该安装孔13用于集流管路1与冷却管路2相连。其中，沿电池包的宽度方向W，该安装孔13内部设置有限位凸台14，且该限位凸台14用于与冷却管路2相抵。相抵指的是冷却管路2抵顶于限位凸台14。冷却管路2的延伸方向为电池包的宽度方向W。
本申请中，通过在集流管路1的安装孔13内设置限位凸台14，使得冷却管路2能够与该限位凸台14相抵，从而限位凸台14起到沿宽度方向W限位冷却管路2的作用，实现冷却管路2与两个集流管路1之间的连接，并能够通过限位凸台14限制冷却管路2伸入安装孔13内的深度。同时，在集流管路1中设置限位凸台14后，无需在冷却管路2设置缩口结构，从而能够提高冷却系统的生产效率，并能够避免冷却管路2设置缩口结构后导致冷却液流动阻力增加，有利于提高冷却系统的能量利用率。缩口结构指的是冷却管路2的端部经过缩口工艺处理后，该端部所对应的开口缩小。
在一个示例中，如图10所示，该安装孔13沿宽度方向W(安装孔13的轴向为宽度方向W)包括第一孔段131和第二孔段132，其中，第二孔段132与本体部11的冷却流道111连通。如图10和图11所示，该第一孔段131沿高度方向H的尺寸大于第二孔段132沿高度方向H的尺寸，且该第一孔段131沿长度方向L的尺寸也大于第二孔段132沿高度方向H的尺寸，从而使得在第一孔段131与第二孔段132之间形成上述限位凸台14。高度方向H与宽度方向W相互垂直。需要说明的是，如图10所示，该安装孔13中，第一孔段131与第二孔段132同轴，因此，上述第一孔段131或第二孔段132沿高度方向H的尺寸指的是：沿高度方向H，对应孔段的侧壁到安装孔13的轴线的距离，同样地，上述第一孔段131或第二孔段132沿长度方向L的尺寸指的是：沿长度方向L，对应孔段的侧壁到安装孔13轴线的距离。
本实施例中，集流管路1中用于安装冷却管路2的安装孔13为阶梯孔，从而能够在该安装孔13的内壁形成上述限位凸台14。如图7所示，冷却管路2的安装段21伸入该安装孔13的第一孔段131内，并与限位凸 台14相抵，且该冷却管路2与第二孔段132相连通，从而使得该冷却管路2与冷却流道111连通。
其中，如图7所示，该第一孔段131的内径与冷却管路2的外径相同，或者第一孔段131的内径大于冷却管路2的外径，从而使得冷却管路2的外壁与第一孔段131的内壁相贴合并焊接，同时保证两者之间彼此密封，降低冷却液从冷却管路2的外壁与第一孔段131的内壁之间泄漏的可能性，也可以防止电池包发生振动时冷却管路2从第一孔段131内脱出。
在一个实施例中，冷却管路2与限位凸台14相抵后，第二孔段132的内壁与冷却管路2的内壁平齐，也即该第二孔段132的内径与冷却管路2的内径相同。本实施例中，由于第二孔段132的内壁与冷却管路2的内壁平齐，两者之间不存在阶梯面，因此在冷却液流过时，能够避免对冷却液产生流动阻力，从而降低冷却液流动时的能量损失，提高该冷却系统的能量利用率，同时，还能够提高冷却液流动的稳定性，从而保证冷却效果的均匀性。可以理解地，第二孔段132的内壁与冷却管路2的内壁平齐并非严格意义的对齐，只要两者内壁大致平齐，能够减小冷却液的流动阻力即可。
在一个实施例中，如图10所示，该安装孔13的第一孔段131具有第一侧壁131a。该冷却流道111具有第二侧壁111a。第一侧壁131a的厚度大于第二侧壁111a的厚度。该第二侧壁111a的厚度即为本体部11的厚度。该本体部11中，安装孔13处的壁厚大于本体部11其余位置的壁厚，即在该安装孔13处，通过增加壁厚能够提高集流管路1在安装孔13处的强度，从而提高集流管路1与冷却管路2沿径向的连接可靠性。
进一步地，如图10和图11所示，该安装孔13中，第一孔段131还连接有第三孔段133，且该第三孔段133与第二孔段132分别位于第一孔段131沿轴向的两端。沿第三孔段133到第一孔段131的方向W1，该第三孔段133为截面积逐渐减小的锥形结构。
冷却管路2通过该安装孔13与集流管路1焊接。在一个示例中，冷却管路2的外壁与安装孔13的内壁焊接。本实施例中，锥形结构的第三孔段133能够方便地进行焊接操作，同时，该第三孔段133还能够用于容 纳焊料，从而能够有效地提高冷却管路2和集流管路1的连接稳定性。
以上各个实施例中，该本体部11的内部设置有凸起部12。该凸起部12沿宽度方向W(冷却管路2的轴向)和高度方向H向本体部11的内部凸起。该凸起部12沿集流管路1的长度方向L延伸，且沿长度方向L，该凸起部12对应开设有多个安装孔13。各个安装孔13沿宽度方向W延伸，且各个安装孔13用于与对应的冷却管路2连接。本实施例中，通过在本体部11内部设置该凸起部12，能够增大安装孔13沿宽度方向W的尺寸，从而增大冷却管路2与安装孔13配合的长度，有利于提高两者的连接可靠性。
在一个实施例中，如图10所示，该凸起部12与本体部11之间圆弧过渡，且该凸起部12的外轮廓为圆弧形。由于凸起部12参与围成集流管路1的冷却流道111，因此本实施例的设置方式能够避免该冷却流道111形成弯折位置，从而减小冷却液在该冷却流道111流动的阻力，提高冷却系统的能量利用率，并提高冷却液在该冷却流道111流动的均匀性，从而提高该冷却系统对电池模组4冷却效果的均匀性。
进一步地，如图10所示，沿集流管路1的高度方向H，该本体部11具有第一底壁112和第二侧壁111a。该第二侧壁111a为靠近冷却管路2的侧壁。该凸起部12设置于该第一底壁112和第二侧壁111a，并位于本体部11的内部。该凸起部12凸出于该第一底壁112和第二侧壁111a。
本实施例中，该集流管路1成型时，通过机加工的形式在本体部11内的凸起部12开设安装孔13，无需采用现有技术中的通过模具冲压出安装孔的加工方式，因此，无需在该集流管路1中预留出冲压模具的壁厚，从而能够降低安装孔13的高度。同时，本申请中的集流管路1可直接挤出成型，从而提高集流管路1的生产效率，且使得该集流管路1底部的倒角较小或无倒角，从而能够进一步降低安装孔13的高度。这样，与现有技术相比，本申请中的安装孔13更加靠近电池包底部，进而使得冷却管路2靠近电池包底部，即能够降低整个冷却系统在电池包中的高度，因此能够提高电池包的能量密度和成组效率。
以上各个实施例中，如图2至图4所示，沿集流管路1的长度方向 L，该本体部11的两端设置有堵盖3。该堵盖3用于沿长度方向L封堵冷却流道111，从而防止冷却液从该集流管路1的端部泄漏。
在一个实施例中，如图3和图4所示，该堵盖3包括第三侧壁31和第二底壁32，其中，该第三侧壁31与本体部11的内壁配合并焊接。该第二底壁32能够封堵该冷却流道111。该第三侧壁31设置有与凸起部12相适配的内凹部311。该内凹部311朝向堵盖3的内部凹陷，且该内凹部311与凸起部12贴合并焊接。
当然，该堵盖3的结构并非仅限于此，还可为其他结构，例如，该堵盖3可为平板结构，且该平板结构与本体部11沿长度方向L的两端部贴合并焊接。本实施例中的堵盖3与本体部11的焊接面积较大，从而能够提高两者的连接可靠性，防止堵盖3在液压力的作用下与本体部11断开。
以上各个实施例中，如图7所示，沿宽度方向W(冷却管路2的轴向)，该冷却管路2包括安装段21和冷却段22。该安装段21伸入安装孔13内，且该安装段21的端部与限位凸台14相抵。冷却段22位于安装孔13外部。在一个示例中，安装段21的截面积与冷却段22的截面积大小相等。其中，安装段21的截面积与冷却段22的截面积大小相等并非数学上严格意义的相等，只要两者的截面积大致相等即可，例如，该冷却管路2可为等径管，即冷却管路2上各个位置的与轴向相垂直的横截面的外径大小相等。
本申请中，集流管路1的安装孔13内设置上述限位凸台14后，冷却管路2能够与该限位凸台14相抵，因此，无需在冷却管路2上设置现有技术中的缩口结构，即该冷却管路2的安装段21与冷却段22截面积相等，从而能够降低冷却管路2的加工难度，提高生产效率，并能够防止因设置缩口结构而导致的冷却液流动阻力增大，提高该冷却系统的能量利用率。
进一步地，本申请实施例还提供一种电池包，该电池包包括电池模组4和冷却系统。该冷却系统用于冷却电池模组4，其中，该冷却系统为以上任一实施例的冷却系统。由于该冷却系统具有上述技术效果，包括该冷 却系统的电池包也应具有相应的技术效果，此处不再赘述。
以上所述仅为本申请的较佳实施例而已，并不用以限制本申请，凡在本申请的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本申请保护的范围之内。

Claims (18)

  1. 一种电池包的冷却系统，所述冷却系统包括：
    集流管路，所述集流管路包括本体部，所述本体部具有冷却流道；
    冷却管路，所述冷却管路沿轴向的两端均设置有所述集流管路，且所述冷却管路与所述冷却流道连通；
    其中，所述本体部还开设有安装孔，所述安装孔内部设置有限位凸台，沿宽度方向，所述限位凸台与所述冷却管路相抵，所述冷却管路的所述轴向为所述宽度方向。
  2. 根据权利要求1所述的冷却系统，其中，所述冷却管路的外壁与所述安装孔的内壁焊接。
  3. 根据权利要求1或2所述的冷却系统，其中，所述集流管路的数量为两个，两个所述集流管路分别位于所述冷却管路沿所述宽度方向的两个端部。
  4. 根据权利要求3所述的冷却系统，其中，两个所述集流管路中的一者设置有进液口和出液口。
  5. 根据权利要求1至4任一项所述的冷却系统，其中，沿所述宽度方向，所述安装孔包括第一孔段和第二孔段，所述第一孔段与所述第二孔段连通，所述第二孔段与所述冷却流道连通；
    沿高度方向和长度方向，所述第一孔段的尺寸大于所述第二孔段的尺寸，所述第一孔段与所述第二孔段之间形成所述限位凸台，所述高度方向为所述集流管路延伸的方向并且与所述轴向相垂直，所述宽度方向、所述长度方向和所述高度方向相互垂直。
  6. 根据权利要求5所述的冷却系统，其中，所述第一孔段的内径与所述冷却管路的外径相同；或者，所述第一孔段的内径大于所述冷却管路的外径。
  7. 根据权利要求5或6所述的冷却系统，其中，所述冷却管路的外壁与所述第一孔段的内壁相贴合并且焊接。
  8. 根据权利要求5至7任一项所示的冷却系统，其中，沿所述高度 方向，所述第二孔段的内壁与所述冷却管路的内壁平齐。
  9. 根据权利要求2至8任一项所述的冷却系统，其中，所述第一孔段具有第一侧壁，所述本体部具有第二侧壁；所述第一侧壁的厚度大于所述第二侧壁的厚度。
  10. 根据权利要求2至9任一项所述的冷却系统，其中，所述第一孔段还连接有第三孔段，所述第三孔段与所述第二孔段分别位于所述第一孔段沿所述宽度方向的两端；
    沿所述第三孔段到所述第一孔段的方向，所述第三孔段为截面积逐渐减小的锥形。
  11. 根据权利要求1至10中任一项所述的冷却系统，其中，沿所述宽度方向，所述冷却管路包括安装段和冷却段；
    其中，所述安装段伸入所述安装孔内，且所述安装段与所述限位凸台相抵，所述冷却段位于所述安装孔外部；
    所述安装段的截面积与所述冷却段的截面积相等。
  12. 根据权利要求1至11中任一项所述的冷却系统，其中，所述本体部的内部设置有凸起部，所述凸起部沿所述宽度方向和高度方向朝向所述本体部的内部凸起，且所述凸起部沿长度方向延伸；
    沿长度方向，所述凸起部开设有多个所述安装孔。
  13. 根据权利要求12所述的冷却系统，其中，沿所述高度方向，所述本体部具有第一底壁，沿所述宽度方向，所述本体部具有第二侧壁，且所述第二侧壁靠近所述冷却管路；
    所述凸起部设置于所述第一底壁和所述第二侧壁，且沿所述高度方向，所述凸起部凸出于所述第一底壁，沿所述宽度方向，所述凸起部凸出于所第二侧壁。
  14. 根据权利要求12或13所述的冷却系统，其中，沿所述长度方向，所述本体部的两端固定连接有堵盖，所述堵盖封堵所述冷却流道。
  15. 根据权利要求14所述的冷却系统，其中，所述堵盖包括第二底壁和第三侧壁；
    其中，所述第三侧壁设置有与所述凸起部配合的内凹部，所述第三侧 壁与所述本体部的内壁固定连接；
    所述第二底壁封堵所述冷却流道。
  16. 根据权利要求15所述的冷却系统，其中，所述第三侧壁与所述本体部的内壁配合并焊接。
  17. 根据权利要求12至16任一项所述的冷却系统，其中，所述凸起部与所述本体部之间圆弧过渡。
  18. 一种电池包，包括：
    电池模组，所述电池模组包括多个单元电池；
    如权利要求1至17中任一项所述的冷却系统，所述冷却管路设置于所述电池模组的下方，所述电池模组的底部与所述冷却管路相互接触；其中，所述冷却系统用于冷却所述电池模组。
PCT/CN2020/077273 2019-03-18 2020-02-28 电池包及其冷却系统 Ceased WO2020187005A1 (zh)

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