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WO2021217968A1 - 折叠电池组和车辆 - Google Patents

折叠电池组和车辆 Download PDF

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Publication number
WO2021217968A1
WO2021217968A1 PCT/CN2020/110880 CN2020110880W WO2021217968A1 WO 2021217968 A1 WO2021217968 A1 WO 2021217968A1 CN 2020110880 W CN2020110880 W CN 2020110880W WO 2021217968 A1 WO2021217968 A1 WO 2021217968A1
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WIPO (PCT)
Prior art keywords
battery
battery pack
soft
present disclosure
battery cell
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/CN2020/110880
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English (en)
French (fr)
Inventor
杨重科
冯帅
赵亮
李成亮
翁志福
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.)
Kunshan Baotron New Energy Technology Co Ltd
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Kunshan Baotron New Energy Technology Co Ltd
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Filing date
Publication date
Priority claimed from CN202020715584.1U external-priority patent/CN212011076U/zh
Priority claimed from CN202010366224.XA external-priority patent/CN111477797A/zh
Application filed by Kunshan Baotron New Energy Technology Co Ltd filed Critical Kunshan Baotron New Energy Technology Co Ltd
Publication of WO2021217968A1 publication Critical patent/WO2021217968A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • 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

  • the present disclosure relates to the field of new energy vehicles. Specifically, the present disclosure relates to folding battery packs and vehicles.
  • the power battery pack exceeds 1m in both the length and width directions; and currently on the market, the length of the battery module is generally around 0.3m. Therefore, at least three or even more battery modules need to be installed in the power battery pack.
  • the present disclosure aims to solve one of the technical problems in the related art at least to a certain extent.
  • one object of the present disclosure is to propose a folding battery pack and a vehicle.
  • the foldable battery pack is made by folding a plurality of series-connected soft-pack batteries, has fewer connection accessories, is convenient to assemble, and has better performance.
  • the present disclosure proposes a folding battery pack.
  • the foldable battery pack includes: a soft-pack battery cell laminate, the soft-pack battery cell stack includes a multi-layer soft-pack battery cell, and each layer of the soft-pack battery cell includes a plurality of battery cells.
  • the battery cell has a positive electrode sheet, a positive electrode lug, a negative electrode sheet, and a negative electrode lug, and each of the battery cells is connected in series; wherein two adjacent layers of the soft-covered battery core have a bending part , The bending part is formed by bending the connection parts of two adjacent battery cell monomers; buffer foam, the buffer foam is arranged between two adjacent layers of the soft-packed battery cells.
  • the foldable battery pack according to the embodiment of the present disclosure, a plurality of battery cells are connected in series, and the connection part of the two battery cells is bent to form a soft-packed battery cell stack structure; by arranging buffer foam, It can not only provide a fixed pre-tightening force for the initial assembly of the battery pack, but also absorb the expansion force of the cell in the later stage of the battery pack. Therefore, the foldable battery pack has fewer connection accessories and is convenient to assemble, and can be directly assembled in series when the battery cells are offline.
  • the foldable battery pack can reduce the series and parallel copper bars between the stacks and the external installation structure, reduce module group accessories, reduce cost and weight, improve space utilization, and can accommodate more pole groups in the battery pack. Improve the mileage of the vehicle.
  • the foldable battery pack reduces the use of external power connectors between modules, avoids bolt connections between modules, does not need to consider the connection stability and reliability of power connectors, reduces the internal resistance of the connection, and thus reduces the power battery The internal friction of the package in use.
  • the foldable battery pack according to the above-mentioned embodiments of the present disclosure may also have the following additional technical features:
  • the total thickness of the buffer foam is 5-20% of the total thickness of the soft-packed cell laminate.
  • a structural glue is provided between the buffer foam and the cell monomer in the soft-packed cell.
  • the thickness of the structural adhesive is 0.05 to 0.2 mm.
  • the strength of the structural adhesive is not less than 0.1 MPa.
  • each of the battery cells is connected in series by laser welding, ultrasonic welding or riveting.
  • the length of the folded battery pack is not less than 600 mm.
  • the foldable battery pack further includes: fixing plates, which are arranged on both sides of the foldable battery pack, and are respectively installed on the first layer of soft pack batteries and the last layer of soft packs On the outside of the battery core, the buffer foam is arranged between the fixed plate and the soft-packed battery core.
  • a plurality of fixing holes are distributed on the side surface.
  • the present disclosure proposes a vehicle.
  • the vehicle includes the folding battery pack of the above-mentioned embodiment. Therefore, the vehicle has all the features and advantages described above for the folding battery pack, which will not be repeated here. In general, the vehicle has better reliability and cruising range.
  • Fig. 1 is a schematic structural diagram of a folding battery pack according to an embodiment of the present disclosure
  • Fig. 2 is a schematic structural diagram of a buffer foam in a folded battery pack according to an embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of the structure of a battery cell in a folding battery pack according to an embodiment of the present disclosure
  • FIG. 4 is a schematic structural diagram of a plurality of battery cells connected in series in a folded battery pack according to an embodiment of the present disclosure
  • FIG. 5 is a schematic structural diagram of a plurality of battery cells connected in series in a folded battery pack according to an embodiment of the present disclosure
  • Figure 6 is a cross-sectional view of the A-A plane in Figure 5;
  • FIG. 7 is a schematic structural diagram of a plurality of battery cells connected in series and a folding tooling in a folding battery pack according to an embodiment of the present disclosure
  • FIG. 8 is a schematic structural diagram of a folding battery pack according to an embodiment of the present disclosure.
  • Fig. 9 is a schematic structural diagram of a fixing plate in a foldable battery pack according to an embodiment of the present disclosure.
  • first and second are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with “first” and “second” may explicitly or implicitly include at least one of the features. In the description of the present disclosure, “plurality” means at least two, such as two, three, etc., unless otherwise specifically defined.
  • the first feature “on” or “under” the second feature may be in direct contact with the first and second features, or the first and second features may be indirectly through an intermediary. touch.
  • the "above”, “above” and “above” of the first feature on the second feature may mean that the first feature is directly above or diagonally above the second feature, or it simply means that the level of the first feature is higher than the second feature.
  • the “below”, “below” and “below” of the second feature of the first feature may be that the first feature is directly below or obliquely below the second feature, or it simply means that the level of the first feature is smaller than the second feature.
  • the present disclosure proposes a folding battery pack. 1 to 5, according to an embodiment of the present disclosure, the foldable battery pack includes: a soft-packed battery cell stack, the soft-packed battery cell stack includes multiple layers of soft-packed batteries, and each layer of soft-packed batteries includes multiple Each battery cell 100 has a positive electrode sheet, a positive electrode lug 110, a negative electrode sheet and a negative electrode lug 120, and each battery cell 100 is connected in series; wherein, two adjacent layers of soft-packed batteries have a curved
  • the bending part 200 is formed by bending the connecting part of two adjacent battery cells 100. Buffer foam, the buffer foam is arranged between two adjacent layers of soft-packed batteries.
  • the foldable battery pack according to the embodiment of the present disclosure, a plurality of battery cells are connected in series, and the connection part of the two battery cells is bent to form a soft-packed battery cell stack structure; by arranging buffer foam, It can not only provide a fixed pre-tightening force for the initial assembly of the battery pack, but also absorb the expansion force of the cell in the later stage of the battery pack. Therefore, the foldable battery pack has fewer connection accessories and is convenient to assemble, and can be directly assembled in series when the battery cells are offline.
  • the foldable battery pack can reduce the series and parallel copper bars between the stacks and the external installation structure, reduce module group accessories, reduce cost and weight, improve space utilization, and can accommodate more pole groups in the battery pack. Improve the mileage of the vehicle.
  • the foldable battery pack reduces the use of external power connectors between modules, avoids bolt connections between modules, does not need to consider the connection stability and reliability of power connectors, reduces the internal resistance of the connection, and thus reduces the power battery The internal friction of the package in use.
  • Fig. 1 shows a schematic structural diagram of a folding battery pack according to an embodiment of the present disclosure.
  • each layer of soft-packed battery cells includes three battery cells 100.
  • the positive electrode ears and the negative electrode ears of two adjacent battery cell units 100 are connected, thereby connecting each battery cell unit 100 in series.
  • Fig. 2 shows a schematic structural diagram of a buffer foam in a folded battery pack according to an embodiment of the present disclosure. The buffer foam is arranged between two adjacent layers of soft battery cells.
  • FIG. 1 does not show the buffer foam provided between the two layers of soft-packed batteries.
  • the total thickness of the above-mentioned buffer foam may be 5-20% of the total thickness of the soft-packed cell laminate. Therefore, suitable buffering can be provided for the battery pack without excessively increasing the volume of the battery pack.
  • a structural glue is provided between the buffer foam and the cell monomer in the soft-packed cell.
  • the structural stability between two adjacent layers of soft-covered cells can be further improved.
  • the two adjacent layers of soft-packed cells are bonded by structural glue, which will not cause excessive influence on the volume of the battery pack.
  • the thickness of the aforementioned structural adhesive may be 0.05 to 0.2 mm, for example, 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, and so on. As a result, the structural stability between two adjacent layers of soft-covered cells can be further improved.
  • the strength of the aforementioned structural adhesive is not less than 0.1 MPa, for example, it may be 0.1 MPa, 0.2 MPa, 0.5 MPa, 1 MPa, 2 MPa, and the like.
  • the battery cell can be a soft-packed battery cell commonly used in the art.
  • the battery cell 100 includes a positive electrode sheet, a positive electrode lug 110, a negative electrode sheet, and a negative electrode lug 120.
  • the battery cell is also wrapped with a packaging structure, such as aluminum plastic film.
  • FIG. 7 The structural schematic diagrams of a plurality of battery cells 100 connected in series that are not folded are shown in Figs. 4-6. As shown in Figs. 4-6, the positive ears and the negative ears of two adjacent battery cells 100 are connected to achieve series connection. Further, according to actual needs, the junction of the positive electrode ear and the negative electrode ear of two adjacent battery cells can be bent to complete the stacking. Specifically, referring to FIG. 7, the bending operation can be completed by the upper tool 310 and the lower tool 320.
  • the individual battery cells are connected in series by laser welding, ultrasonic welding or riveting.
  • the positive and negative electrode tabs of the two battery cells are connected by the above-mentioned connection method, and the joint part obtained by the connection is easy to bend.
  • the length of the folded battery pack of the present disclosure is not less than 600 mm.
  • the folding battery pack of the present disclosure is formed by connecting and folding a plurality of battery cells, and the specific folding position is selected according to actual needs, so that the length of the folding battery pack can be easily adjusted.
  • the length of the folding battery pack By designing the length of the folding battery pack to be no less than 600mm, it can meet the adaptation requirements of common new energy vehicle battery packs.
  • the folding battery pack of the present disclosure may further include: a fixing plate 400.
  • the fixing plate 400 is arranged on both sides of the folded battery pack, and is respectively installed on the outer side of the first layer of soft-packed batteries and the last layer of soft-packed batteries, and buffer foam is arranged between the fixing plate 400 and the soft-packed batteries.
  • the fixing plate 400 may be bonded to the buffer foam by using structural glue, and at the same time, the buffer foam and the inner soft-packed battery cell are also bonded by structural glue.
  • the fixing plate can be used to fix the multilayer soft-packed battery cell, which further improves the structural stability of the multilayer soft-packed battery core.
  • a plurality of fixing holes 410 are distributed on the side of the fixing plate 400.
  • the fixing hole 410 can be used to install and fix the foldable battery pack in the battery system.
  • the folding battery pack according to the embodiments of the present disclosure has at least one of the following advantages:
  • the internal connection of the foldable battery pack has no additional conductive structures such as copper bars or aluminum bars, which has low cost and fast connection;
  • the batteries in the folding battery pack can be welded directly with the assembly line after the battery production workshop is off the assembly line. After welding, bend at different positions of the batteries according to the system requirements to achieve stacking and high assembly efficiency;
  • the folding battery pack with the same number of cells does not need to reserve space for installation, module expansion, and external connection, which can greatly improve the folding battery in the battery pack. Volume utilization in the system.
  • the present disclosure proposes a vehicle.
  • the vehicle includes the folding battery pack of the above-mentioned embodiment. Therefore, the vehicle has all the features and advantages described above for the folding battery pack, which will not be repeated here. In general, the vehicle has better reliability and cruising range.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

本公开提供了折叠电池组和车辆。该折叠电池组包括：软包电芯层叠体，所述软包电芯层叠体包括多层软包电芯，每层所述软包电芯包括多个电芯单体，所述电芯单体具有正极片、正极耳、负极片和负极耳，各个所述电芯单体之间串联连接；其中，相邻两层所述软包电芯具有一个弯折部，所述弯折部由相邻的两个所述电芯单体的连接部位弯折而成；缓冲泡棉，所述缓冲泡棉设在相邻两层所述软包电芯之间。

Description

折叠电池组和车辆
优先权信息
本公开请求于2020年4月30日向中国国家知识产权局提交的、专利申请号为202010366224.X、202020715584.1、申请名称为“折叠电池组和车辆”的中国专利申请的优先权，并且其全部内容通过引用结合在本公开中。
技术领域
本公开涉及新能源汽车领域，具体而言，本公开涉及折叠电池组和车辆。
背景技术
随着新能源汽车的不断普及，新能源汽车中动力电池的使用要求变得越来越高。特别是用户对新能源汽车续时里程的要求不断提高，常见的新能源汽车，动力电池包无论在长度还是宽度方向，都超过1m；而目前市面上，电池模块的长度一般在0.3m左右，所以在动力电池包中，需要设置至少三个，甚至更多电池模块。
设置多个电池模块，则需要对每个电池模块均添加固定结构，组装复杂。同时，相邻两个电池模块之间需要通过外设的动力连接件进行动力连接。电池模块安装结构较多，不仅导致成本提高，而且导致整体重量上升；同时，单个模组体积内，安装结构占用了较多的内部空间，造成动力电池模块，电池包整体容量降低，电池包内电池模块设置越多，空间浪费就越多。另外，因需要设置多个外置动力连接件进行动力连接，导致内阻、成本增加，提高了动力电池包在使用中的内耗和成本。
综上所述，现有的新能源汽车电池组仍有待改进。
公开内容
本公开旨在至少在一定程度上解决相关技术中的技术问题之一。为此，本公开的一个目的在于提出折叠电池组和车辆。该折叠电池组由多个串联的软包电芯折叠制成，连接附件少、组装方便，且性能更佳。
在本公开的一个方面，本公开提出了一种折叠电池组。根据本公开的实施例，该折叠电池组包括：软包电芯层叠体，所述软包电芯层叠体包括多层软包电芯，每层所述软包电芯包括多个电芯单体，所述电芯单体具有正极片、正极耳、负极片和负极耳，各个所述电 芯单体之间串联连接；其中，相邻两层所述软包电芯具有一个弯折部，所述弯折部由相邻的两个所述电芯单体的连接部位弯折而成；缓冲泡棉，所述缓冲泡棉设在相邻两层所述软包电芯之间。
根据本公开实施例的折叠电池组中，多个电芯单体串联连接，并通过对两个电芯单体的连接部位弯折，形成软包电芯层叠体结构；通过设置缓冲泡棉，既可以为电池组初期组装提供固定的预紧力，也可以在电池组使用后期对电芯膨胀力进行吸收。由此，该折叠电池组的连接附件少、组装方便，可以随电芯单体下线直接进行串联组装。该折叠电池组可通过减少堆叠体之间的串并联铜排以及外部安装结构，减少模块成组附件，降低成本和重量，提高空间利用率，进而可以在电池包能容纳更多的极组，提升车辆续航里程。同时，该折叠电池组减少了模块之间外部动力连接件的使用，避免模组之间螺栓连接，无需考虑动力连接件的连接稳定性及可靠性，降低了连接内阻，进而减少了动力电池包在使用中的内耗。
另外，根据本公开上述实施例的折叠电池组还可以具有如下附加的技术特征：
在本公开的一些实施例中，所述缓冲泡棉的总厚度为所述软包电芯层叠体总厚度的5～20％。
在本公开的一些实施例中，所述缓冲泡棉与所述软包电芯中的电芯单体之间设有结构胶。
在本公开的一些实施例中，所述结构胶的厚度为0.05～0.2mm。
在本公开的一些实施例中，所述结构胶的强度不小于0.1MPa。
在本公开的一些实施例中，各个所述电芯单体之间通过激光焊接、超声波焊接或铆接串联连接。
在本公开的一些实施例中，所述折叠电池组的长度不小于600mm。
在本公开的一些实施例中，所述折叠电池组进一步包括：固定板，所述固定板设在所述折叠电池组的两侧，并分别安装于首层软包电芯和末层软包电芯外侧，所述固定板与所述软包电芯之间设有所述缓冲泡棉。
在本公开的一些实施例中，所述侧面分布设有多个固定孔。
在本公开的另一方面，本公开提出了一种车辆。根据本公开的实施例，该车辆包括上述实施例的折叠电池组。由此，该车辆具有前文针对折叠电池组所描述的全部特征和优点，在此不再一一赘述。总得来说，该车辆具有更佳的可靠性和续航里程。
本公开的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明 显，或通过本公开的实践了解到。
附图说明
本公开的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：
图1是根据本公开实施例的折叠电池组的结构示意图；
图2是根据本公开实施例的折叠电池组中缓冲泡棉的结构示意图；
图3是根据本公开实施例的折叠电池组中电芯单体的结构示意图；
图4是根据本公开实施例的折叠电池组中多个串联连接的电芯单体的结构示意图；
图5是根据本公开实施例的折叠电池组中多个串联连接的电芯单体的结构示意图；
图6是图5中A-A面的剖视图；
图7是根据本公开实施例的折叠电池组中多个串联连接的电芯单体及折叠工装的结构示意图；
图8是根据本公开实施例的折叠电池组的结构示意图；
图9是根据本公开实施例的折叠电池组中固定板的结构示意图。
具体实施方式
下面详细描述本公开的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本公开，而不能理解为对本公开的限制。
在本公开的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本公开和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本公开的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本公开中，除非另有明确的规定和限定，“安装”、“相连”、“连接”、“固定”等术语应 做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本公开中的具体含义。
在本公开中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本公开的一个方面，本公开提出了一种折叠电池组。参考图1～5，根据本公开的实施例，该折叠电池组包括：软包电芯层叠体，所述软包电芯层叠体包括多层软包电芯，每层软包电芯包括多个电芯单体100，电芯单体具有正极片、正极耳110、负极片和负极耳120，各个电芯单体100之间串联连接；其中，相邻两层软包电芯具有一个弯折部200，弯折部200由相邻的两个电芯单体100的连接部位弯折而成。缓冲泡棉，缓冲泡棉设在相邻两层软包电芯之间。
根据本公开实施例的折叠电池组中，多个电芯单体串联连接，并通过对两个电芯单体的连接部位弯折，形成软包电芯层叠体结构；通过设置缓冲泡棉，既可以为电池组初期组装提供固定的预紧力，也可以在电池组使用后期对电芯膨胀力进行吸收。由此，该折叠电池组的连接附件少、组装方便，可以随电芯单体下线直接进行串联组装。该折叠电池组可通过减少堆叠体之间的串并联铜排以及外部安装结构，减少模块成组附件，降低成本和重量，提高空间利用率，进而可以在电池包能容纳更多的极组，提升车辆续航里程。同时，该折叠电池组减少了模块之间外部动力连接件的使用，避免模组之间螺栓连接，无需考虑动力连接件的连接稳定性及可靠性，降低了连接内阻，进而减少了动力电池包在使用中的内耗。
下面参考图1～9进一步对根据本公开实施例的折叠电池组进行详细描述。
图1示出了根据本公开一个实施例的折叠电池组的结构示意图。该折叠电池组中，每层软包电芯包括三个电芯单体100。在每层软包电芯中，相邻的两个电芯单体100的正极耳与负极耳连接，从而将各个电芯单体100串联连接。图2示出了根据本公开一个实施例的折叠电池组中缓冲泡棉的结构示意图，该缓冲泡棉设在相邻两层软包电芯之间。另外，需要说明的是，图1中未示出设在两层软包电芯之间的缓冲泡棉。
根据本公开的一些实施例，上述缓冲泡棉的总厚度可以为软包电芯层叠体总厚度的5～20％。由此，可以为电池组提供适宜的缓冲，且不会过多地增大电池组的体积。
根据本公开的一些实施例，缓冲泡棉与软包电芯中的电芯单体之间设有结构胶。由此，可以进一步提高相邻两层软包电芯之间的结构稳定性。并且，通过结构胶粘接相邻两层软包电芯，不会对电池组的体积造成过大影响。
根据本公开的一些实施例，上述结构胶的厚度可以为0.05～0.2mm，例如0.05mm、0.1mm、0.15mm、0.2mm等。由此，可以进一步提高相邻两层软包电芯之间的结构稳定性。
根据本公开的一些实施例，上述结构胶的强度不小于0.1MPa，例如可以为0.1MPa、0.2MPa、0.5MPa、1MPa、2MPa等。
在本公开的折叠电池组中，电芯单体可以采用本领域常见的软包电芯。参考图3，电芯单体100包括正极片、正极耳110、负极片和负极耳120。电芯单体外部还包裹有封装结构，例如铝塑膜等。
未进行折叠的多个串联连接的电芯单体100的结构示意图如图4～6。如图4～6所示，相邻的两个电芯单体100的正极耳与负极耳连接，实现串联连接。进一步地，可根据实际需要，对相邻的两个电芯单体的正极耳与负极耳连接处进行弯折，从而完成叠装。具体地，参考图7，弯折操作可通过上工装310和下工装320完成。
根据本公开的一些实施例，各个电芯单体之间通过激光焊接、超声波焊接或铆接串联连接。通过上述连接方式对将两电芯单体的正负极极耳连接，连接得到的结合部位容易进行弯折。
根据本公开的一些实施例，本公开的折叠电池组的长度不小于600mm。本公开的折叠电池组由多个电芯单体连接并折叠而成，根据实际需要选择具体的折叠部位，很容易调节折叠电池组的长度。通过设计折叠电池组的长度为不小于600mm，可以满足常见新能源汽车电池包的适配需求。
参考图8，根据本公开的一些实施例，本公开的折叠电池组还可以进一步包括：固定板400。固定板400设在折叠电池组的两侧，并分别安装于首层软包电芯和末层软包电芯外侧，固定板400与软包电芯之间设有缓冲泡棉。具体的，固定板400可利用结构胶与缓冲泡棉粘接，同时，缓冲泡棉与内侧软包电芯也通过结构胶进行粘接。由此，可以利用固定板对多层软包电芯加以固定，进一步提高多层软包电芯的结构稳定性。
参考图9，根据本公开的一些实施例，上述固定板400的侧面还分布设有多个固定孔410。可利用固定孔410将折叠电池组安装固定在电池系统中。
综上可知，根据本公开实施例的折叠电池组具有下列优点的至少之一：
1、折叠电池组内部连接，没有铜排、铝排等导电的附加结构，成本低，连接快速；
2、折叠电池组内电芯可在电芯生产车间下线后，直接随流水线焊接，焊接后，按照系统要求，在不同的电芯位置进行折弯，实现叠装，组装效率高；
3、极耳之间直接连接，减少连接附件，降低成本，增加连接可靠性；
4、相比于传统模组每个模块都需四个螺栓固定和连接的传统电池模组，减少的每个模块固定螺栓和次数，大大提高生产效率；
5、相比于需四个螺栓固定的传统电池模组，相同数量的电芯的折叠电池组不需要预留用于安装、模组膨胀、外部连接的空间，能够大幅度提高折叠组在电池系统中的体积利用率。
在本公开的另一方面，本公开提出了一种车辆。根据本公开的实施例，该车辆包括上述实施例的折叠电池组。由此，该车辆具有前文针对折叠电池组所描述的全部特征和优点，在此不再一一赘述。总得来说，该车辆具有更佳的可靠性和续航里程。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本公开的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
尽管上面已经示出和描述了本公开的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本公开的限制，本领域的普通技术人员在本公开的范围内可以对上述实施例进行变化、修改、替换和变型。

Claims (10)

  1. 一种折叠电池组，其中，包括：
    软包电芯层叠体，所述软包电芯层叠体包括多层软包电芯，每层所述软包电芯包括多个电芯单体，所述电芯单体具有正极片、正极耳、负极片和负极耳，各个所述电芯单体之间串联连接；其中，相邻两层所述软包电芯具有一个弯折部，所述弯折部由相邻的两个所述电芯单体的连接部位弯折而成；
    缓冲泡棉，所述缓冲泡棉设在相邻两层所述软包电芯之间。
  2. 根据权利要求1所述的折叠电池组，其中，所述缓冲泡棉的总厚度为所述软包电芯层叠体总厚度的5～20％。
  3. 根据权利要求1或2所述的折叠电池组，其中，所述缓冲泡棉与所述软包电芯中的电芯单体之间设有结构胶。
  4. 根据权利要求1～3中任一项所述的折叠电池组，其中，所述结构胶的厚度为0.05～0.2mm。
  5. 根据权利要求1～4中任一项所述的折叠电池组，其中，所述结构胶的强度不小于0.1MPa。
  6. 根据权利要求1～5中任一项所述的折叠电池组，其中，各个所述电芯单体之间通过激光焊接、超声波焊接或铆接串联连接。
  7. 根据权利要求1～6中任一项所述的折叠电池组，其中，所述折叠电池组的长度不小于600mm。
  8. 根据权利要求1～7中任一项所述的折叠电池组，其中，进一步包括：
    固定板，所述固定板设在所述折叠电池组的两侧，并分别安装于首层软包电芯和末层软包电芯外侧，所述固定板与所述软包电芯之间设有所述缓冲泡棉。
  9. 根据权利要求8所述的折叠电池组，其中，所述侧面分布设有多个固定孔。
  10. 一种车辆，其中，包括：权利要求1～9任一项所述的折叠电池组。
PCT/CN2020/110880 2020-04-30 2020-08-24 折叠电池组和车辆 Ceased WO2021217968A1 (zh)

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