WO2024255906A1 - 电池模组、电池模组装配方法及动力电池包 - Google Patents

电池模组、电池模组装配方法及动力电池包 Download PDF

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Publication number
WO2024255906A1
WO2024255906A1 PCT/CN2024/099619 CN2024099619W WO2024255906A1 WO 2024255906 A1 WO2024255906 A1 WO 2024255906A1 CN 2024099619 W CN2024099619 W CN 2024099619W WO 2024255906 A1 WO2024255906 A1 WO 2024255906A1
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WIPO (PCT)
Prior art keywords
battery
battery cell
busbar
battery module
pole
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Pending
Application number
PCT/CN2024/099619
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English (en)
French (fr)
Inventor
黄毅轩
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Svolt Energy Technology Co Ltd
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Svolt Energy Technology Co Ltd
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Publication date
Application filed by Svolt Energy Technology Co Ltd filed Critical Svolt Energy Technology Co Ltd
Publication of WO2024255906A1 publication Critical patent/WO2024255906A1/zh
Anticipated expiration legal-status Critical
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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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/507—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • 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
    • H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • 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
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • 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 application relates to the field of battery technology, for example, to a battery module, a battery module assembly method and a power battery pack.
  • the utilization rate of the internal space of the power battery pack has a great impact on the overall power.
  • the connection structure between adjacent cells in the battery module is complex and there are many parts, resulting in low utilization rate of the internal space of the battery pack, low energy density of the battery pack, and the overall endurance needs to be improved.
  • the present application provides a battery module, which includes a plurality of cell groups arranged side by side in a thickness direction, the cell groups including at least two cells and at least one bus, the plurality of cells in each cell group are arranged in a row along the length direction thereof, and the positive and negative electrodes of two adjacent cells in each cell group are arranged opposite to each other and electrically connected through the bus;
  • the bus includes a first connection end and a second connection end, one side of the bus is a pole connection surface, the pole connection surface on the first connection end contacts and is electrically connected to the end face of a positive pole of one cell, the pole connection surface on the second connection end contacts and is electrically connected to the end face of a negative pole of another cell, and the end face of the electrically connected positive pole and negative pole in each cell group are parallel.
  • the busbar is a bendable sheet structure.
  • the bending portion of the busbar is located in the middle of the length direction of the busbar, and adjacent positive poles and negative poles in the same battery cell group are arranged opposite to each other.
  • the extending direction of the bent portion of the busbar is the thickness direction of the battery cell.
  • the bending portion of the bus bar does not exceed the edge of the battery cell.
  • the back side of the pole connection surface is a welding surface, and the busbar is connected to the pole by welding.
  • the positive electrode column and the negative electrode column on each battery cell are respectively arranged at two ends in the length direction of the battery cell.
  • the present application also provides a battery module assembly method, which is applied to the above-mentioned battery module. Before the bus and the battery cell are connected, the angle between the first connection end and the second connection end is greater than 0°.
  • the battery module assembly method includes: welding the first connection end to the positive electrode column and welding the second connection end to the negative electrode column; bending the bus, after bending, the first connection end and the second connection end are parallel, and the battery cells in each battery cell group are arranged along the length direction; arranging multiple battery cell groups along the thickness direction.
  • the present application also provides a power battery pack, which includes a shell and the above-mentioned battery module, wherein the battery module is arranged inside the shell, a connecting plate is arranged on the top of the battery module, and each battery cell is connected to the connecting plate.
  • FIG1 is a schematic structural diagram of a battery cell assembly during welding provided in Example 1 of the present application;
  • FIG2 is a schematic diagram of the structure of a battery cell assembly after assembly provided in Example 1 of the present application;
  • FIG3 is a schematic diagram of a partial structure of a battery cell assembly after assembly provided in Embodiment 1 of the present application;
  • FIG4 is a schematic diagram of an exploded structure of a power battery pack provided in Example 1 of the present application.
  • FIG5 is a top view of a partial structure of a power battery pack provided in Example 1 of the present application.
  • FIG6 is a schematic structural diagram of a battery cell assembly during welding provided in Example 2 of the present application.
  • FIG. 7 is a schematic diagram of the structure of a battery cell group after assembly provided in Embodiment 2 of the present application.
  • 100 battery pack
  • 101 battery cell
  • 110 positive pole
  • 120 negative pole
  • 130 explosion-proof valve
  • 140 Bus
  • 200 battery module
  • 300 shell
  • 310 bottom plate
  • 320 cover plate
  • 330 enclosure
  • 400 connecting plate
  • 500 battery management system
  • 600 battery pack disconnect unit
  • 700 liquid cooling plate
  • 800 welding equipment.
  • the terms “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside”, “outside” and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.
  • the terms “first” and “second” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
  • first position and second position are two different positions
  • first feature “above”, “above” and “above” the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.
  • first feature “below”, “below” and “below” the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
  • the terms “installed”, “connected”, and “connected” should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components.
  • installed should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components.
  • this embodiment provides a battery module 200, including a plurality of cell groups 100 arranged side by side in the thickness direction, the cell group 100 including at least two cells 101 and at least one bus bar 140, the plurality of cells 101 in each cell group 100 are arranged in a row along the length direction thereof, and the positive and negative electrodes of two adjacent cells 101 in each cell group 100 are arranged opposite to each other and electrically connected through the bus bar 140.
  • the bus bar 140 includes a first connection end and a second connection end, one side of the bus bar 140 is a pole connection surface, the pole connection surface on the first connection end contacts and electrically connects with the end surface of the positive pole 110 of one cell 101, the pole connection surface on the second connection end contacts and electrically connects with the end surface of the negative pole 120 of another cell 101, and the end surface of the electrically connected positive pole 110 and negative pole 120 in each cell group 100 are parallel.
  • the battery module 200 electrically connects the multiple cells 101 in each cell group 100 through the busbar 140.
  • the cells 101 are arranged such that the multiple cells 101 in each cell group 100 are connected end to end along their length, with the positive electrode column 110 and the negative electrode column 120 facing each other, so as to facilitate connection with the busbar 140. Connect and conduct electricity.
  • Multiple battery cell groups 100 are arranged side by side, so that multiple battery cells 101 in the battery module 200 can be compactly arranged in both the length direction and the height direction.
  • Adjacent battery cells 101 can be electrically connected by only one bus bar 140, which is convenient to connect and can effectively save the internal space of the power battery pack, so that the power battery pack has a higher energy density, thereby greatly improving the endurance of the power battery pack.
  • a gap is provided between adjacent battery cell groups 100, satisfying the gap ⁇ 0.1 mm and the gap ⁇ 0.2 times the thickness of the battery cell 101.
  • a heat insulation strip is provided between adjacent battery cell groups 100, and the thickness of the heat insulation strip is not greater than the gap.
  • the busbar 140 is a bendable sheet structure.
  • the first connection end and the second connection end are not parallel, that is, there is a certain angle between the first connection end and the second connection end, and the setting of the angle facilitates the connection between the pole and the busbar 140.
  • the busbar 140 and the pole are electrically connected by welding, and the back side of the pole connection surface can be used as a welding surface.
  • the welding device 800 contacts this surface to fix the busbar 140 on the pole. Therefore, when welding, the welding device 800 can be placed between the angles of the first connection end and the second connection end, which is very convenient to operate.
  • the busbar 140 is bent again until the first connection end and the second connection end are parallel, so that the two connected battery cells 101 are parallel, avoiding wasting the internal space of the power battery pack.
  • the busbar 140 is set as a sheet structure, which can be bent very conveniently.
  • the busbar 140 should not be too thin to avoid damage or insufficient conductivity during bending. Of course, the busbar 140 should not be too thick to avoid difficulty in bending, inconvenience in assembly, and waste of space inside the power battery pack.
  • the distance between two adjacent battery cells 101 is 4-40 mm. If the distance is too small, the battery cells 101 cannot be grouped, and if the distance is too large, the power of the entire package will be affected.
  • the interval between the first connection end and the second connection end is 0.2-20 mm.
  • the bus bar 140 can be made of copper, aluminum or other metal materials according to usage requirements.
  • the angle between the first connection end and the second connection end is greater than or equal to 60°, ensuring that the welding device 800 can perform welding from the end face of the pole.
  • the bending portion of the busbar 140 is located in the middle of the length direction of the busbar 140, and the adjacent positive poles 110 and negative poles 120 in the same battery cell group 100 are arranged opposite to each other.
  • the bending portion of the busbar 140 is located in the middle of the busbar 140, that is, the busbar 140 is a symmetrical structure, so that the ends are aligned after bending. This structure facilitates the positioning and installation between the busbar 140 and the battery cell 101 , and avoids the height misalignment of the two battery cells 101 after being fully assembled, which affects the subsequent assembly process and easily causes space waste.
  • a positioning notch may be provided on the side of the busbar 140 to be aligned with the pole, thereby ensuring that the two opposite end faces of the two assembled battery cells 101 can face each other.
  • the end of the first connection end is aligned with the edge of the positive pole 110, and the end of the second connection end is aligned with the edge of the negative pole 120, thereby ensuring that the two opposite end faces of the two assembled battery cells 101 can face each other.
  • the extension direction of the bent portion of the busbar 140 is the thickness direction of the battery cell 101.
  • the interval is 2 to 30 mm.
  • the setting of the interval reserves space for the bend of the busbar 140. Therefore, the placement of the busbar 140 in this way is conducive to the layout of the overall structure, and it is easier to achieve the purpose of not exceeding the edge of the battery cell 101 at the bend of the busbar 140.
  • the bending part of the busbar 140 does not exceed the edge of the battery cell 101. The reason is that when the height of the bending part of the busbar 140 is higher than the height of the battery cell 101, the busbar 140 protrudes from the upper end surface of the battery cell 101, which will affect the assembly of other components above the battery cell 101 and will occupy a larger space inside the power battery pack, which is not conducive to improving the battery energy density.
  • the positive pole 110 and the negative pole 120 on each battery cell 101 are respectively arranged at both ends in the length direction of the battery cell 101. Only one bus bar 140 is used to connect every two battery cells 101. An explosion-proof valve 130 is arranged at one end of the battery cell 101 that is not connected to the bus bar 140, and is arranged to release the pressure inside the battery to prevent the battery module 200 from exploding or other dangerous accidents under high temperature and high pressure.
  • This embodiment also provides a method for assembling a battery module 200, which is applied to the above-mentioned battery module 200.
  • the angle between the first connection end and the second connection end is greater than 0°.
  • the setting of the angle can facilitate welding of the busbar 140 and the pole.
  • the method for assembling the battery module 200 mainly includes:
  • Welding connection is a mature technical means in this field, with reliable assembly and high connection strength.
  • the assembly is convenient, the production efficiency is high, and the overall structure of the assembled battery module 200 is compact, which is conducive to improving the endurance of the power battery pack.
  • this embodiment further provides a power battery pack, which includes a housing 300 and the above-mentioned battery module 200 , wherein the battery module 200 is disposed inside the housing 300 .
  • the power battery pack adopts the compact battery module 200, the overall spatial layout is more reasonable, and the capacity density is fully improved under limited assembly space.
  • the housing 300 includes a panel 330, an upper cover connected to the top of the panel 330, and a bottom plate 310 connected to the bottom of the panel 330.
  • the battery cell 101 is attached to the bottom plate 310, and the bottom plate 310 is provided with vertical reinforcing ribs in a direction parallel to the battery cell 101.
  • the reinforcing ribs and the explosion-proof valve 130 do not overlap in the projection in the height direction of the battery cell 101.
  • a battery management system 500, a battery pack disconnecting unit 600 and a liquid cooling plate 700 are also provided inside the housing 300.
  • the liquid cooling plate 700 is provided at the bottom of the battery module 200 and is provided to dissipate heat for the battery module 200.
  • the liquid cooling plate 700 and the bottom of the battery module 200 can be fixed by gluing, and a heat conductive structural adhesive is used for gluing, and the thermal conductivity is not higher than 5W/(m ⁇ k), and the adhesive area accounts for 60% to 100% of the total area of the liquid cooling plate 700.
  • the number of liquid cooling plates 700 can be one or more, and is set according to the needs of use.
  • a connecting plate 400 is provided on the top of the battery module 200, and each battery cell 101 is connected to the connecting plate 400.
  • each battery cell group 100 includes two battery cells 101, and the tops of the two battery cells 101 are connected to the connecting plate 400, and the connection method can be gluing.
  • the connecting plate 400 spans the battery cells 101 on the left and right sides, effectively improving the rigidity between the two rows of battery cells 101 and ensuring the structural stability of the power battery pack.
  • the extension direction of the bent portion of the busbar 140 is the height direction of the battery cell 101. After being bent, the edge of the busbar 140 does not extend beyond the surface of the battery cell 101, so as not to affect the arrangement of the multiple battery cell groups 100.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Mounting, Suspending (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

本申请公开了电池模组、电池模组装配方法及动力电池包。电池模组包括多个在厚度方向上并排设置的电芯组，电芯组包括至少两个电芯和至少一个汇流排，每个电芯组中的多个电芯沿其长度方向排列呈行，且每个电芯组中的相邻两个电芯的正负极相对设置并通过汇流排电连接。汇流排包括第一连接端和第二连接端，汇流排的其中一面为极柱连接面，第一连接端上的极柱连接面和一个电芯的正极柱的端面接触并电连接，第二连接端上的极柱连接面和另一个电芯的负极柱的端面接触并电连接，每个电芯组内电连接的正极柱的端面和负极柱的端面平行。

Description

电池模组、电池模组装配方法及动力电池包
本申请要求在2023年06月15日提交中国专利局、申请号为202310710769.1的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及电池技术领域，例如涉及电池模组、电池模组装配方法及动力电池包。
背景技术
随着新能源汽车的发展，传统燃油汽车逐步被代替，纯电动汽车由于无需利用燃油，具有清洁、无污染的优点，越来越受到用户的欢迎。动力电池作为新能源汽车的主要动力来源，其续航能力、安全性能和使用寿命等特征是动力电池研发过程中的重点问题。随着人们对于新能源汽车续航能力的要求逐渐增加，动力电池包内需要布置更多的电池，因此，矩阵式动力电池包应运而生。
动力电池包内部空间的利用率对于整体的电量具有较大影响，矩阵式动力电池包中，电池模组中相邻的电芯之间连结构接复杂，零部件较多，导致电池包内部空间利用率较低，电池包的能量密度低，整体的续航能力有待提高。
发明内容
本申请提供一种电池模组，该电池模组，包括多个在厚度方向上并排设置的电芯组，所述电芯组包括至少两个电芯和至少一个汇流排，每个电芯组中的多个电芯沿其长度方向排列呈行，且每个电芯组中的相邻两个电芯的正负极相对设置并通过汇流排电连接；所述汇流排包括第一连接端和第二连接端，所述汇流排的其中一面为极柱连接面，所述第一连接端上的极柱连接面和一个电芯的正极柱的端面接触并电连接，所述第二连接端上的极柱连接面和另一个电芯的负极柱的端面接触并电连接，每个电芯组内电连接的正极柱的端面和负极柱的端面平行。
一实施例中，所述汇流排为可弯折的片状结构。
一实施例中，所述汇流排的折弯部位位于所述汇流排长度方向的中部，且同一电芯组中相邻的正极柱和负极柱正对设置。
一实施例中，所述汇流排的折弯部位的延伸方向为所述电芯的厚度方向。
一实施例中，所述汇流排的弯折处不超出所述电芯的边缘。
一实施例中，所述极柱连接面的背面为焊接面，所述汇流排与所述极柱焊接连接。
一实施例中，每个电芯上的正极柱和负极柱分别设置在所述电芯长度方向上的两端。
本申请还提供一种电池模组装配方法，该电池模组装配方法，应用于上述的电池模组，所述汇流排和所述电芯连接之前，所述第一连接端和所述第二连接端的之间的夹角大于0°，所述电池模组装配方法包括：将所述第一连接端和所述正极柱焊接、所述第二连接端和所述负极柱焊接；将所述汇流排进行弯折，弯折后所述第一连接端和所述第二连接端平行，且每个电芯组中的电芯沿长度方向排列；将多个电芯组沿厚度方向排列。
本申请还提供一种动力电池包，该动力电池包，包括壳体和上述的电池模组，所述电池模组设置在所述壳体的内部，所述电池模组的顶部设置有连接板，每个电芯和所述连接板连接。
一实施例中，每个电芯的长度范围是350mm～1000mm，电池模组总长度L0/壳体内部空间长度W2＝0.85～0.98，和/或，电池模组主体长度L1/动力电池包整体长度W1＝0.88～0.97。
附图说明
图1是本申请实施例一提供的一种电芯组在焊接过程中的结构示意图；
图2是本申请实施例一提供的一种电芯组装配完成后的结构示意图；
图3是本申请实施例一提供的一种电芯组装配完成后的局部结构示意图；
图4是本申请实施例一提供的一种动力电池包的爆炸结构示意图；
图5是本申请实施例一提供的一种动力电池包的局部结构俯视图；
图6是本申请实施例二提供的一种电芯组在焊接过程中的结构示意图；
图7是本申请实施例二提供的一种电芯组装配完成后的结构示意图。
图中：
100、电芯组；101、电芯；110、正极柱；120、负极柱；130、防爆阀；140、
汇流排；200、电池模组；300、壳体；310、底板；320、盖板；330、围板；400、连接板；500、电池管理系统；600、电池包断路单元；700、液冷板；800、焊接设备。
具体实施方式
下面将结合附图对本申请的技术方案进行描述，所描述的实施例是本申请一部分实施例。
在本申请的描述中，术语“中心”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“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申请和简化描述，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申请的限制。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。其中，术语“第一位置”和“第二位置”为两个不同的位置，而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，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”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本申请的描述中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；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。对于本领域的普通技术人员而言，可以根据情况理解上述术语在本申请中的含义。
下面详细描述本申请的实施例，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，仅用于解释本申请，而不能理解为对本申请的限制。
实施例一
参见图1和图2，本实施例提供一种电池模组200，包括多个在厚度方向上并排设置的电芯组100，电芯组100包括至少两个电芯101和至少一个汇流排140，每个电芯组100中的多个电芯101沿其长度方向排列呈行，且每个电芯组100中的相邻两个电芯101的正负极相对设置并通过汇流排140电连接。汇流排140包括第一连接端和第二连接端，汇流排140的其中一面为极柱连接面，第一连接端上的极柱连接面和一个电芯101的正极柱110的端面接触并电连接，第二连接端上的极柱连接面和另一个电芯101的负极柱120的端面接触并电连接，每个电芯组100内电连接的正极柱110的端面和负极柱120的端面平行。
上述电池模组200将每个电芯组100中的多个电芯101通过汇流排140进行电连接。电芯101在排列方式上，每个电芯组100中的多个电芯101沿其长度方向首尾相连，正极柱110和负极柱120相对，从而方便和汇流排140进行 连接导电。多个电芯组100并排设置，从而电池模组200中的多个电芯101在长度方向和高度方向均能够实现紧凑的排列。相邻电芯101之间仅通过一个汇流排140即可实现电连接，连接方便，且能够有效节省动力电池包的内部空间，从而动力电池包具有较高的能量密度，进而在极大程度上提高了动力电池包的续航能力。
一实施例中，相邻电芯组100之间设有间隙，满足间隙≥0.1mm，同时满足间隙≥0.2倍电芯101厚度。相邻电芯组100之间设有隔热条，隔热条厚度不大于间隙。
继续参见图1和图2，汇流排140为可弯折的片状结构。在本实施例中，汇流排140在和极柱进行连接之前，第一连接端和第二连接端并不平行，即第一连接端和第二连接端之间具有一定夹角，该夹角的设置方便极柱和汇流排140的连接。
示例性地，通过焊接的连接方式将汇流排140和极柱进行电连接，则极柱连接面的背面可作为焊接面，焊接设备800和此面接触，将汇流排140固定在极柱上。因此，在进行焊接时，焊接设备800可放置于第一连接端和第二连接端的夹角之间，操作十分方便。焊接完成后，再将汇流排140进行弯折，直至第一连接端和第二连接端相平行，从而相连接的两个电芯101平行，避免对动力电池包的内部空间造成浪费。将汇流排140设置为片状结构，能够十分方便地对其进行弯折。
汇流排140厚度不宜过薄，以免弯折过程中发生破损或导电能力不足，当然，汇流排140的厚度也不宜过厚，以免弯折难度大，装配不便，同时造成动力电池包内部空间的浪费。
汇流排140弯折至第一连接端和第二连接端相平行后，相邻两个电芯101之间的距离为4～40mm，该距离过小则无法成组，过大则整包电量受影响。
汇流排140弯折至第一连接端和第二连接端相平行后，第一连接端和第二连接端之间间隔为0.2～20mm。
一实施例中，汇流排140可以选用铜、铝或其他金属材质，根据使用需要进行选择即可。
一实施例中，汇流排140在弯折之前，第一连接端和第二连接端之间的夹角大于或等于60°，保证焊接设备800能够从极柱的端面进行焊接。
一实施例中，汇流排140的折弯部位位于汇流排140长度方向的中部，且同一电芯组100中相邻的正极柱110和负极柱120正对设置。汇流排140折弯部位位于汇流排140的中部，即汇流排140为对称结构，从而弯折后端部对齐， 该结构方便汇流排140和电芯101之间的定位安装，避免装配完整后的两个电芯101在高度上错位，影响后续的装配过程，而且容易造成空间浪费。
一实施例中，可在汇流排140的侧边设置定位刻痕，设置为和极柱进行对齐，从而保证装配后的两个电芯101相对的两个端面能够正对。或者，在装配过程中，将第一连接端的末端和正极柱110的边缘对齐，同时保证第二连接端的末端和负极柱120的边缘对齐，从而保证装配后的两个电芯101相对的两个端面能够正对。
一实施例中，参见图2和图3，汇流排140的折弯部位的延伸方向为电芯101的厚度方向。在电芯101结构的设计上，极柱上边缘和电芯101的上端面之间具有一定间隔，一实施例中，间隔大小为2～30mm。该间隔的设置为汇流排140的弯折处预留了空间，因此，汇流排140采用这样的摆放位置有利于整体结构的布局，能够更容易实现汇流排140弯折处不超出电芯101边缘的目的。
而在本实施例中，汇流排140的弯折处不超出电芯101的边缘，原因在于，当汇流排140弯折处的高度高于电芯101的高度时，汇流排140凸出于电芯101上端面，这将对电芯101上方的其他部件的装配造成影响，而且会占用动力电池包内部较大空间，不利于电池能量密度的提升。
一实施例中，每个电芯101上的正极柱110和负极柱120分别设置在电芯101长度方向上的两端。每两个电芯101之间仅采用一个汇流排140进行连接即可。电芯101中在未和汇流排140连接的一端设置有防爆阀130，设置为泄放电池内部的压力，避免电池模组200在高温高压状态下发生爆炸等危险事故。
本实施例还提供一种电池模组200装配方法，该方法应用于上述的电池模组200。在汇流排140和电芯101连接之前，第一连接端和第二连接端之间的夹角大于0°。如上所述，该夹角的设置能够方便汇流排140和极柱进行焊接。该电池模组200装配方法主要包括：
S1、将第一连接端和正极柱110焊接、第二连接端和负极柱120焊接。
S2、将汇流排140进行弯折，弯折后第一连接端和第二连接端平行，且每个所述电芯组100中的所述电芯101沿长度方向排列。
S3、将多个电芯组100沿厚度方向排列。
焊接连接为本领域成熟的技术手段，装配可靠，连接强度高。在电芯组100的装配过程中，无需采用较多零部件，装配方便，生产效率高，并且装配后的电池模组200整体结构紧凑，有利于提升动力电池包的续航能力。
参见图4，本实施例还提供一种动力电池包，该动力电池包包括壳体300和上述的电池模组200，电池模组200设置在壳体300的内部。
该动力电池包由于采用上述结构紧凑的电池模组200，在整体的空间布局上更加合理，在有限的装配空间下实现了能力密度的充分提高。
一实施例中，壳体300包括围板330、连接于围板330顶部的上盖以及连接于围板330底部的底板310。电芯101粘贴在底板310上，底板310沿电芯101平行方向设置有竖直加强筋。加强筋与防爆阀130在电芯101高度方向投影不重合。
一实施例中，壳体300的内部还设置有电池管理系统500、电池包断路单元600和液冷板700，液冷板700设置在电池模组200的底部，设置为对电池模组200进行散热。一实施例中，可采用胶粘的方式将液冷板700和电池模组200底部进行固定，使用导热结构胶粘贴，导热系数不高于5W/(m·k)，粘胶面积占液冷板700总面积的60％～100％。液冷板700的数量可以为一个或多个，根据使用需要进行设置。
一实施例中，电池模组200的顶部设置有连接板400，每个电芯101和连接板400连接。在本实施例中，每个电芯组100包括两个电芯101，两个电芯101顶部均和连接板400进行连接，连接方式可以为胶粘，连接板400横跨左右两侧电芯101，有效提升两排电芯101之间的刚度，保证动力电池包的结构稳定性。
参见图5，在本实施例中，每个电芯101(包括两端极柱)的长度范围是350mm～1000mm，电池模组总长度L0/壳体内部空间长度W2＝0.85～0.98，电池模组主体(不包括极柱)长度L1/动力电池包整体长度W1＝0.88～0.97。
实施例二
参见图6和图7，本实施例提供的电池模组和实施例一的相同之处不再进行赘述，以下仅对本实施例和实施例一的不同之处进行说明：
在本实施例中，汇流排140的折弯部位的延伸方向为电芯101的高度方向。汇流排140在弯折后，其边缘不超出电芯101的表面，以免影响多个电芯组100的排列。

Claims (10)

  1. 电池模组，包括多个在厚度方向上并排设置的电芯组(100)，所述电芯组(100)包括至少两个电芯(101)和至少一个汇流排(140)，每个电芯组(100)中的多个电芯(101)沿所述多个电芯(101)的长度方向排列呈行，且每个电芯组(100)中的相邻两个电芯(101)的正负极相对设置并通过汇流排(140)电连接；
    所述汇流排(140)包括第一连接端和第二连接端，所述汇流排(140)的一面为极柱连接面，所述第一连接端上的极柱连接面和一个电芯(101)的正极柱(110)的端面接触并电连接，所述第二连接端上的极柱连接面和另一个电芯(101)的负极柱(120)的端面接触并电连接，每个电芯组(100)内电连接的正极柱(110)的端面和负极柱(120)的端面平行。
  2. 根据权利要求1所述的电池模组，其中，所述汇流排(140)为可弯折的片状结构。
  3. 根据权利要求2所述的电池模组，其中，所述汇流排(140)的折弯部位位于所述汇流排(140)长度方向的中部，且同一电芯组(100)中相邻的正极柱(110)和负极柱(120)正对设置。
  4. 根据权利要求2所述的电池模组，其中，所述汇流排(140)的折弯部位的延伸方向为所述电芯(101)的厚度方向或高度方向。
  5. 根据权利要求2所述的电池模组，其中，所述汇流排(140)的弯折处不超出所述电芯(101)的边缘。
  6. 根据权利要求1-5任一项所述的电池模组，其中，所述极柱连接面的背面为焊接面，所述汇流排(140)与所述极柱焊接连接。
  7. 根据权利要求1-5任一项所述的电池模组，其中，每个电芯(101)上的正极柱(110)和负极柱(120)分别设置在所述电芯(101)长度方向上的两端。
  8. 电池模组装配方法，应用于权利要求1-7所述的电池模组，所述汇流排和所述电芯连接之前，所述第一连接端和所述第二连接端的之间的夹角大于0°，所述电池模组装配方法包括：
    将所述第一连接端和所述正极柱焊接、所述第二连接端和所述负极柱(120)焊接；
    将所述汇流排进行弯折，弯折后所述第一连接端和所述第二连接端平行，且每个电芯组中的电芯沿长度方向排列；
    将多个电芯组沿厚度方向排列。
  9. 一种动力电池包，包括壳体(300)和权利要求1-7任一项所述的电池模组(200)，所述电池模组(200)设置在所述壳体(300)的内部，所述电池模组(200)的顶 部设置有连接板(400)，每个电芯(101)和所述连接板(400)连接。
  10. 根据权利要求9所述的动力电池包，其中，每个电芯(101)的长度范围是350mm～1000mm，且满足以下至少之一：
    电池模组总长度L0/壳体内部空间长度W2＝0.85～0.98；
    电池模组主体长度L1/动力电池包整体长度W1＝0.88～0.97。
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