WO2021088667A1 - 电连接片、电池模块、电池组及装置 - Google Patents

电连接片、电池模块、电池组及装置 Download PDF

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Publication number
WO2021088667A1
WO2021088667A1 PCT/CN2020/123464 CN2020123464W WO2021088667A1 WO 2021088667 A1 WO2021088667 A1 WO 2021088667A1 CN 2020123464 W CN2020123464 W CN 2020123464W WO 2021088667 A1 WO2021088667 A1 WO 2021088667A1
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WO
WIPO (PCT)
Prior art keywords
electrical connection
connection piece
battery
flow
flow increasing
Prior art date
Application number
PCT/CN2020/123464
Other languages
English (en)
French (fr)
Inventor
许枭
黄仰枝
沈升
Original Assignee
宁德时代新能源科技股份有限公司
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 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to EP23217481.3A priority Critical patent/EP4318741A2/en
Priority to EP20885093.3A priority patent/EP3926737B1/en
Publication of WO2021088667A1 publication Critical patent/WO2021088667A1/zh
Priority to US17/555,931 priority patent/US20220115745A1/en

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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
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
    • H01M50/103—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure prismatic or rectangular
    • 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
    • H01M50/505—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising a single busbar
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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 an electrical connection sheet, a battery module, a battery pack and a device.
  • the present application provides an electrical connection piece, a battery module, a battery pack and a device, which can increase the overcurrent area and improve the overcurrent capability of the electrical connection piece.
  • the first aspect of the present application provides an electrical connection piece for a battery module, the battery module includes a battery cell, and the electrical connection piece includes a first part and a second part;
  • the first part includes the flow-increasing part and the body part of the avoidance zone;
  • the flow-increasing part is located in the area set around the avoidance area, and the flow-increasing part is connected to one side of the main body along the thickness direction of the electrical connection sheet;
  • the second part is connected to the end of the main body and used to connect with the battery cell.
  • the body portion includes a first body portion and a connecting section, and the avoiding area is a through hole or a notch opened in the connecting section.
  • the flow increasing part is located in the first body part, and the width of the flow increasing part is smaller than the width of the first body part.
  • the body part further includes a second body part, and the first body part and the second body part are connected by a connecting section;
  • the flow increasing part is located in the first body part and/or the second body part.
  • the avoidance area is a through hole opened in the connecting section, and the flow increasing portion is located in the connecting section.
  • the flow increasing part includes a first flow increasing part and a second flow increasing part
  • the first flow increasing part, the through hole and the second flow increasing part are arranged at intervals.
  • the body part is further provided with a groove, and the groove is located on one or both sides of the flow increasing part.
  • the flow increasing part and the body part are integrally formed
  • the flow increasing part is bent along the side wall of the main body part, and the main body part and the flow increasing part are attached to each other.
  • the second aspect of the present application also provides a battery module, which includes a plurality of battery cells and the above-mentioned electrical connection sheet; the second part of the electrical connection sheet electrically connects the electrode leads of the battery cells.
  • the third aspect of the present application also provides a battery pack, which includes the above-mentioned battery module.
  • the fourth aspect of the present application also provides a device using a battery cell as a power source, including a power source, the power source is used to provide driving force for the device, and the battery module as described above configured to provide electrical energy to the power source.
  • the first part of the electrical connecting piece provided by the present application includes a body part and a flow increasing part.
  • the body part is provided with a avoidance area, so that the current increase part is located in an area set around the avoidance area, and the current increase part is connected to one side of the body part .
  • the area becomes smaller, so the flow area also becomes smaller. Therefore, the area set around the avoidance area is provided with a current increasing part to increase the flow area and effectively improve the flow of the electrical connection piece. Flow capacity.
  • FIG. 1 is a schematic diagram of the structure of a battery pack provided by an embodiment of the application
  • FIG. 2 is a schematic structural diagram of a battery module provided by an embodiment of the application.
  • Figure 3 is an exploded view of a battery module provided by an embodiment of the application.
  • FIG. 4 is a schematic diagram of the structure of a battery cell provided by an embodiment of the application.
  • Figure 5 is an exploded view of a battery cell provided by an embodiment of the application.
  • FIG. 6 is a schematic structural diagram of a first type of electrical connection sheet provided by an embodiment of the application.
  • FIG. 7 is a front view of the first type of electrical connecting piece provided by the embodiment of the application after the current increasing portion is bent;
  • FIG. 8 is a front view of the first type of electrical connection sheet before the current increasing part is bent according to the embodiment of the application;
  • FIG. 9 is a partial enlarged view of the first type of electrical connection piece provided by the embodiment of the application based on the one shown in FIG. 8; FIG.
  • FIG. 10 is a schematic structural diagram of a second type of electrical connection sheet provided by an embodiment of the application.
  • FIG. 11 is a schematic structural diagram of a third type of electrical connection piece provided by an embodiment of the application.
  • P-battery pack M-battery module; 1-electrical connecting piece; 10-first part; 101-body part; 101a-avoidance area; 101b-first body part; 101c-second body part; 101d-connecting section; 101da-first connecting section; 101db-second connecting section; 101e-groove; 102-increasing part; 102a-first increasing part; 102b-second increasing part; 102c-third increasing part; 11 -Second part; 2-frame structure; 20-side plate; 21-end plate; 3-battery cell; 30-top cover assembly; 301-top cover plate; 302-electrode lead; 303-explosion-proof port; 31- Housing; 32-electrode assembly; 4-box; 40-upper box; 41-lower box.
  • the embodiment of the present application provides a device using a battery cell as a power source, including a power source, and the power source is used to provide driving force for the device; and a battery module M configured to provide electric energy to the power source.
  • the device using the battery cell 3 as a power source includes mobile equipment such as vehicles, ships, small aircrafts, etc.
  • the device includes a power source for providing driving force to the device, and the power source can be configured to provide power to the power source.
  • Battery module M to provide electrical energy.
  • the driving force of the device can be all electric energy, and it can also include electric energy and other energy sources (such as mechanical energy).
  • the power source can be a battery module M (or battery pack P), and the power source can also be a battery module M (or Battery pack P) and engine, etc. Therefore, any device capable of using the battery cell 3 as a power source is within the protection scope of the present application.
  • the vehicle in the embodiment of the present application may be a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle, etc.
  • the vehicle may include a battery pack and a vehicle body.
  • the battery pack is arranged on the vehicle body.
  • the vehicle body is also provided with a drive motor, and the drive motor is electrically connected to the battery pack.
  • the battery pack provides electric power, and the drive motor is connected to the vehicle body through a transmission mechanism.
  • the wheels on the main body of the vehicle are connected to drive the vehicle.
  • the battery pack can be horizontally arranged at the bottom of the vehicle body.
  • a battery pack P provided by an embodiment of the present application includes a box body 4 and a battery module M arranged in the box body 4.
  • the box body 4 can be made of aluminum, aluminum alloy or other metal materials.
  • 4 includes an upper box body 40 and a lower box body 41, the upper box body 40 and the lower box body 41 are buckled together to form an accommodation cavity.
  • One or more than two battery modules M can be accommodated in the accommodating cavity.
  • the battery modules M can be arranged side by side along the length direction of the battery pack P in the box 4, or can be arranged side by side along the width direction of the battery pack P, and each The battery module M is fixed to the box 4.
  • an embodiment of the present application provides a battery module M, which includes a plurality of battery cells 3 and a frame structure 2, wherein the battery cells 3 can be a secondary battery that can be used repeatedly in charge and discharge.
  • the battery cells 3 can be a secondary battery that can be used repeatedly in charge and discharge.
  • a plurality of battery cells 3 are located in the inner cavity of the frame structure 2 and stacked on each other in the inner cavity.
  • the frame structure 2 includes a side plate 20 and an end plate 21. The side plate 20 and the end plate 21 jointly fix the battery cells 3, and the battery cells 3 are connected in series or in parallel through the electrical connecting piece 1.
  • the battery cell 3 includes at least an electrode assembly 32, a casing 31, and an electrode lead 302.
  • the casing 31 can be a hexahedron or other shapes, and the casing 31 is formed inside
  • the accommodating cavity is used for accommodating the electrode assembly 32 and the electrolyte, and the electrode lead 302 is electrically connected to the electrode assembly 32.
  • the housing 31 may include a metal material, such as aluminum or aluminum alloy, and may also include an insulating material, such as plastic.
  • the top cover assembly 30 includes a top cover plate 301 and an electrode lead 302.
  • the top cover plate 301 is fixed to the opening of the housing 31 so as to seal the electrode assembly 32 and the electrolyte in the accommodating cavity of the housing 31.
  • the lead wire 302 is arranged on the top cover plate 301, and the top cover plate 301 is provided with an explosion-proof opening 303.
  • the battery module M further includes an electrical connection piece 1 which electrically connects the electrode leads 302 of the plurality of battery cells 3 to realize the series or parallel connection of the plurality of battery cells 3.
  • an embodiment of the present application provides an electrical connection sheet 1 for a battery module M, which includes a first part 10 and a second part 11; the first part 10 includes a body part 101 and a current increasing part. 102.
  • the main body 101 is provided with an avoidance area 101a, and the current increasing portion 102 is located in an area set around the avoidance area 101a; the second part 11 is connected to the end of the main body 101 and is used to connect with the battery cell 3.
  • an avoidance area 101a needs to be provided on the electrical connection piece 1. After the avoidance area 101a is provided, The overcurrent capability of the electrical connection piece 1 is reduced, resulting in an excessively high temperature rise, which is likely to cause safety problems.
  • the area becomes smaller, so the flow area also becomes smaller. Therefore, the current increasing portion 102 is provided in the area set around the avoidance area 101a. , Thereby increasing the overcurrent area, effectively improving the overcurrent capability of the electrical connecting piece 1.
  • the flow increasing portion 102 can be located in an area set around the avoidance area 101a according to actual conditions, for example, it can be in an area with the center of the avoidance area 101a as the center and the radius as the set value, or it can be A certain reference edge of the avoidance area 101a is used as a reference and extends a set distance, etc., which is not limited here.
  • the first part 10 and the second part 11 are an integrated structure, which facilitates the processing and manufacturing of the electrical connection piece 1.
  • the electrical connection sheet 1 may be a plate-like or sheet-like structure made of metal materials.
  • the flow increasing portion 102 of the first part 10 and the main body 101 are integrally formed, that is, the flow increasing portion 102 and the main body 101 are respectively an integral part of the electrical connection sheet 1.
  • the electrical connection sheet 1 can be manufactured through a tailoring process. First, according to the design requirements, by cutting the metal plate or metal sheet, the electrical connection piece 1 as shown in FIG. 8 is obtained. At this time, the two ends of the first part 10 of the electrical connection piece 1 are respectively connected to the two second parts 11 , The flow increasing part 102 is connected to the side wall of the main body 101. Then, the flow increasing portion 102 is bent along the side wall of the main body portion 101 so that the flow increasing portion 102 and the main body portion 101 are attached and disposed.
  • the current-increasing portion 102 obtained by shearing is bent and then flattened, so that the current-increasing portion 102 is in close contact with the main body 101 to obtain the electrical connection sheet 1 as shown in FIG. 7.
  • the flow increasing portion 102 is connected to one side of the main body 101.
  • the shape of the current increasing portion 102 can be set to be rectangular, trapezoidal or irregular, as long as the current increasing portion 102 does not exceed the edges of the body portion 101 and the second portion 11, which facilitates the manufacture of the electrical connection piece 1. Avoid excessive material waste during the cutting process, resulting in material waste.
  • the electrical connection piece 1 can also be manufactured integrally by a casting or machining process, and one side of the body portion 101 is partially thickened along the thickness direction H of the electrical connection piece 1 to form the flow increasing portion 102.
  • the body portion 101 includes a first body portion 101b and a connecting section 101d, and the avoiding area 101a is a through hole or a notch opened in the connecting section 101d.
  • the avoidance area 101a is provided in the connecting section 101d.
  • the avoidance area 101a can be in the form of a through hole or a notch to avoid the structure of the battery cell 3, and the current increasing portion 102b can be provided in the first body part. 101b.
  • the connecting section 101d can be partially narrowed.
  • the notch is adapted to the protruding part, which facilitates the body Part 101 is connected to the battery cell 3, but after the connection section 101d is provided with a gap, the area decreases and the flow area there is also smaller. Therefore, the current increasing part 102 is provided in the area set around the gap, thereby increasing The overcurrent area is enlarged, and the overcurrent capability of the electrical connection piece 1 is effectively improved.
  • the avoidance area 101a When the avoidance area 101a is set as a through hole, the through hole can be arranged to avoid the explosion-proof valve of the battery cell 3. Therefore, a hole is opened on the electrical connecting piece 1, but the area of the connecting section 101d is reduced after the hole is opened.
  • the overcurrent area at the location also becomes smaller, so the current increasing portion 102 is provided in the area set around the avoidance area 101a, thereby increasing the overcurrent area and effectively improving the overcurrent capability of the electrical connection piece 1.
  • the flow increasing portion 102 is located in the first body portion 101b, and the width H2 of the flow increasing portion 102 is smaller than the width H1 of the first body portion 101b.
  • the battery module M usually also includes a wire harness isolation plate. In order to avoid being restricted by the wire harness isolation plate, the width of the current increasing portion 102 is smaller than the width of the first body portion 101b, thereby facilitating the overall assembly of the battery module M. It can be understood that, the closer the width of the current increasing portion 102 is to the width of the first body portion 101b, the larger the flow area of the electrical connection piece 1 is.
  • the body part 101 further includes a second body part 101c, the first body part 101b and the second body part 101c are connected by a connecting section 101d, and the flow increasing part 102 is located in the first body part 101b and/or the second body part 101c.
  • Two body parts 101c As shown in FIG. 6, there are two current-increasing parts 102, which are respectively located at the first body part 101b and the second body part 101c.
  • the electrical connection piece 1 is generally located at the middle position of the battery module M and is used to hold the battery cell 3
  • the electrode lead 302 is electrically connected. As shown in FIG. 11, the current increasing portion 102 is located at the first body portion 101b and the second body portion 101c, respectively.
  • the electrode lead 302 of the battery cell 3 is electrically connected.
  • the flow increasing part 102 is provided on both sides of the notched connecting section 101d. Compared with the flow increasing part 102 provided on one side of the notched connecting section 101d, the flow increasing part 102 is provided on both sides. The overcurrent capability of the electrical connection piece 1 of the part 102 can be improved even more.
  • both ends of the first body portion 101b are respectively connected with a first connecting section 101da and a second connecting section 101db, that is, the connecting section 101d includes a first connecting section 101da and a second connecting section 101db, and the first connecting section 101d
  • the section 101da forms a set angle with the first body portion 101b, and the set angle is 90°.
  • the electrical connection piece 1 is generally located at the edge of the battery module M and is used to connect the electrodes of the multiple battery cells 3
  • the lead 302 is electrically connected.
  • the avoidance area 101a is a through hole opened in the connecting section 101d, and the flow increasing portion 102 is located in the connecting section 101d.
  • the avoidance area 101a is a through hole opened in the first connecting section 101da, and the flow increasing portion 102 is located in the first connecting section 101da.
  • the area of the first connecting section 101da with the through hole becomes smaller, and the flow area there is also smaller. Therefore, the flow increasing part 102 is provided in the area set around the avoidance area 101a to increase the flow area and effectively Improve the overcurrent capability of the electrical connection piece 1.
  • the flow increasing part 102 includes a first flow increasing part 102a and a second flow increasing part 102b.
  • the first flow increasing part 102a and the second flow increasing part 102b are both located in the first connecting section 101da along the first connecting section 101da.
  • the first flow increasing portion 102a, the through hole, and the second flow increasing portion 102b are arranged at intervals.
  • the spacing arrangement facilitates the balanced distribution of current, avoids excessive deviation of the overcurrent area, and at the same time facilitates the size adjustment of the current increasing portion 102 in the thickness direction H of the electrical connection sheet 1.
  • the first flow increasing portion 102a is connected to the side wall of the first connecting section 101da
  • the second flow increasing portion 102b is connected to the hole wall of the through hole
  • the flow increasing portion 102 is bent so that Both the first flow increasing portion 102a and the second flow increasing portion 102b are attached to the first connecting section 101da.
  • the first flow increasing portion 102a is bent along the side wall of the first connecting section 101da and extends toward the direction close to the through hole, so that the edge of the first flow increasing portion 102a is close to the wall of the through hole, but does not block the through hole. The closer the width of a flow increasing portion 102a is to the wall of the through hole, the larger the flow area of the electrical connection piece 1 is.
  • the second flow increasing portion 102b is bent along the wall of the through hole and extends in a direction away from the through hole, so that the second flow increasing portion 102b is close to the side wall of the first connecting section 101da, and the width of the second flow increasing portion 102b The closer to the edge of the first connection section 101da, the larger the flow area of the electrical connection piece 1 is.
  • the avoidance area 101a is a gap opened in the second connection section 101db, that is, the second connection section 101db is partially narrowed. Because the electrode leads 302 of some battery cells 3 have protruding parts, the gap and the convex The part of the output is adapted to facilitate the connection of the main body 101 and the battery cell 3. However, after the second connecting section 101db is provided with a gap, the area there is reduced, and the flow area there is also smaller, so it is around the gap The current increasing part 102 is arranged in the set area, thereby increasing the overcurrent area and effectively improving the overcurrent capability of the electrical connecting piece 1.
  • the flow increasing part 102 may also include a third flow increasing part 102c.
  • the third flow increasing part 102c is located on the first body part 101b. Due to the restriction of the wiring harness isolation plate, the width of the first body part 101b In the direction X2, the width of the third current increasing portion 102c is smaller than the width of the first body portion 101b, but the width of the third current increasing portion 102c is close to the width of the first body portion 101b, which increases the flow area of the electrical connection sheet 1.
  • a notch is provided on the second connecting section 101db, and the notch and the third flow increasing portion 102c are arranged along the length direction X1 of the first body 101b. Since the first body 101b is provided with a notch, the arrangement of the third flow increasing portion 102c is improved The overcurrent capability of the electrical connection piece 1.
  • the second part 11 is connected to one end of the first part 10, wherein the body part 101 includes a first body part 101b and a second body part 101c, and the first body part 101b and the second body part 101c pass through the connecting section. 101d is connected, and the flow increasing part 102 is located at the first body part 101b and the second body part 101c.
  • One end of the second body part 101c is connected to the second part 11, and one end of the first body part 101b is connected to the output end of the battery module M.
  • the flow increasing portion 102 is located on the side of the main body 101, and the flow increasing portion 102 is located above the main body 101.
  • the electrical connection piece 1 is connected to the battery cell 3, in the thickness direction H, the current increasing portion 102 is located above the electrical connection piece 1.
  • the electrical connection sheet 1 is only partially thickened in the height direction without affecting the length direction and the width direction, so the space occupied is small.
  • the body portion 101 is further provided with a groove 101 e, and the groove 101 e is located on one or both sides of the flow increasing portion 102.
  • the current-increasing portion 102 of the electrical connection piece 1 is bent, it can prevent the electrical connection piece 1 from being damaged due to stress concentration during the bending, thereby ensuring the strength performance and functionality of the electrical connection piece 1 after bending.
  • grooves 101e may be provided on both sides of the flow increasing portion 102, and the width of the grooves 101e is greater than 1.2 mm, which further avoids the problem of stress concentration in the electrical connection sheet 1 when bending.
  • the width of the groove 101e is generally set to 1.5 mm.
  • the electrical connection sheet 1 provided in this embodiment includes a first part 10 and a second part 11, wherein the first part 10 includes a body part 101 and a flow increasing part 102, and the body part 101 is provided with a connection
  • the section 101d and the avoidance area 101a, and the avoidance area 101a is a through hole or notch opened in the connecting section 101d, and the flow increasing portion 102 is located in an area set around the through hole or notch.
  • the connecting section 101d is provided with the notch or through hole, this place As the area is reduced, the flow area at this place also becomes smaller. Therefore, a flow increasing portion 102 is provided in the area set around the notch or through hole to increase the flow area and effectively improve the flow capacity of the electrical connection piece 1.

Abstract

一种电连接片（1）、电池模块（M）、电池组（P）及装置，涉及储能器件技术领域，电连接片（1）包括第一部分（10）和第二部分（11）；所述第一部分（10）包括增流部（102）和设置避让区（101a）的本体部（101）；所述增流部（102）位于所述避让区（101a）周围设定的区域，沿所述电连接片（1）的厚度方向，所述增流部（102）连接于所述本体部（101）的一侧；所述第二部分（11）连接于所述本体部（101）端部并用于与电池单体（3）连接。电池模块（M）包括多个电池单体（3）和上述的电连接片（1）；所述电连接片（1）的第二部分（11）将所述多个电池单体（3）的电极引线（302）电连接。通过在避让区（101a）周围设置增流部（102），实现了过流面积的增加，进而改善了电连接片（1）的过流能力。

Description

电连接片、电池模块、电池组及装置
相关申请的交叉引用
本申请要求享有于2019年11月04日提交的名称为“电连接片、电池模块、电池组及装置”的中国专利申请201921885117.7的优先权，该申请的全部内容通过引用并入本申请中。
技术领域
本申请涉及储能器件技术领域，尤其涉及一种电连接片、电池模块、电池组及装置。
背景技术
随着新能源电动汽车的普及，各主机厂商对动力电池组的要求也趋近多样化，尤其是对电池模块的能量密度、安全性和兼容性的要求越来越高。在电池模块中各个电池单体之间通过电连接片相互连接，在实现串并联后再向外输出电压，在目前电池快充技术逐渐成为主流的情况下，电连接片的温度在快充时往往会变得很高，过高的温度对电池单体和模组的安全性能都造成了影响。
由于电池模块的设计需求，在电连接片的本体部上需要设置避让区，导致了本体部上的过流面积减小，因此过流能力降低，导致温升过高，容易引发安全问题。
发明内容
本申请提供了一种电连接片、电池模块、电池组及装置，能够增加过流面积，提高电连接片的过流能力。
本申请的第一方面提供了一种用于电池模块的电连接片，电池模块包括电池单体，电连接片包括第一部分和第二部分；
第一部分包括增流部和设置避让区的本体部；
增流部位于避让区周围设定的区域，沿电连接片的厚度方向，增流部连接于本体部的一侧；
第二部分连接于本体部端部并用于与电池单体连接。
在一些实施例中，本体部包括第一本体部和连接段，避让区为开设于连接段的通孔或缺口。
在一些实施例中，增流部位于第一本体部，且增流部的宽度小于第一本体部的宽度。
在一些实施例中，本体部还包括第二本体部，第一本体部和第二本体部通过连接段连接；
增流部位于第一本体部和/或第二本体部。
在一些实施例中，避让区为开设于连接段的通孔，且增流部位于连接段。
在一些实施例中，增流部包括第一增流部和第二增流部；
沿连接段的宽度方向,第一增流部、通孔和第二增流部间隔排布。
在一些实施例中，本体部还设置有凹槽，凹槽位于增流部的一侧或两侧。
在一些实施例中，增流部与本体部一体成型；
增流部沿本体部的的侧壁弯折，且本体部和增流部贴合。
本申请的第二方面还提供一种电池模块，其包括多个电池单体和上述的电连接片；电连接片的第二部分将电池单体的电极引线电连接。
本申请的第三方面还提供一种电池组，其包括上述的电池模块。
本申请的第四方面还提供一种使用电池单体作为电源的装置，包括，动力源，动力源用于为装置提供驱动力；被配置为向动力源提供电能的如上述的电池模块。
本申请提供的技术方案可以达到以下有益效果：
本申请所提供的电连接片的第一部分包括本体部和增流部，本体部设置有避让区，使增流部位于避让区周围设定的区域，且增流部连接于本体部的一侧。设置避让区的本体部处，由于面积变小，因此过流面积也变小，因此在避让区周围设定的区域设置增流部，从而增大过流面积，有效地改善电连接片的过流能力。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性的，并不能限制本申请。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述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，还可以根据附图获得其他的附图。
图1为本申请实施例所提供的电池组的结构示意图；
图2为本申请实施例所提供的电池模块的结构示意图；
图3为本申请实施例所提供的电池模块的爆炸图；
图4为本申请实施例所提供的电池单体的结构示意图；
图5为本申请实施例所提供的电池单体的爆炸图；
图6为本申请实施例所提供的第一种电连接片的结构示意图；
图7为本申请实施例所提供的第一种电连接片的增流部弯折之后的主视图；
图8为本申请实施例所提供的第一种电连接片的增流部弯折之前的主视图；
图9为本申请实施例所提供的第一种电连接片基于图8所示的局部放大图；
图10为本申请实施例所提供的第二种电连接片的结构示意图；
图11为本申请实施例所提供的第三种电连接片的结构示意图。
标记说明：
P-电池组；M-电池模块；1-电连接片；10-第一部分；101-本体部；101a-避让区；101b-第一本体部；101c-第二本体部；101d-连接段；101da-第一连接段；101db-第二连接段；101e-凹槽；102-增流部；102a-第一增流部；102b-第二增流部；102c-第三增流部；11-第二部分；2-框架结构；20-侧板；21-端板；3-电池单体；30-顶盖组件；301-顶盖板；302-电极引线；303-防爆口；31-壳体；32-电极组件；4-箱体；40-上箱体；41-下箱体。
具体实施方式
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。
在本申请的描述中，需要说明的是，除非另有说明，“多个”的含义是两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指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”、“第三”等仅用于描述目的，而不能理解为指示或暗示相对重要性。“垂直”并不是严格意义上的垂直，而是在误差允许范围之内。“平行”并不是严格意义上的平行，而是在误差允许范围之内。
下述描述中出现的方位词均为图中示出的方向，并不是对本申请的具体结构进行限定。在本申请的描述中，还需要说明的是，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；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本申请中的具体含义。
本申请的实施例提供一种使用电池单体作为电源的装置，包括，动力源，且动力源用于为装置提供驱动力；被配置为向动力源提供电能的电池模块M。其中，使用电池单体3作为电源的装置包括车辆、船舶、小型飞机等移动设备，该装置包括动力源，该动力源用于为装置提供驱动力，且该动力源可被配置为向动力源提供电能的电池模块M。其中，该装置的驱动力可全部为电能，也可包括电能和其他能源(例如机械能)，该动力源可为电池模块M(或电池组P)，该动力源也可为电池模块M(或电池组P)和发动机等。因此，只要能够使用电池单体3作为电源的装置均在本申请的保护范围内。
以车辆为例，本申请实施例中的车辆可为新能源汽车，该新能源汽车可为纯电动汽车，也可为混合动力汽车或增程式汽车等。其中，该车辆可包括电池组和车辆主体，该电池组设置于车辆主体，该车辆主体还设置有驱动电机，且驱动电机与电池组电连接，由电池组提供电能，驱动电机通过传动机构与车辆主体上的车轮连接，从而驱动车辆行进。具体地，该电池组可水平设置车辆主体的底部。
如图1所示，本申请实施例提供的一种电池组P，包括箱体4以及设置在箱体4的电池模块M，箱体4可由铝、铝合金或其他金属材料制成，箱体4包括上箱体40和下箱体41，上箱体40和下箱体41扣合后形成容置腔。容置腔内可容置一个或两个以上的电池模块M，电池模块M 在箱体4内可以沿电池组P的长度方向并排设置，也可以沿电池组P的宽度方向并排设置，且各电池模块M与箱体4固定。
如图2和图3所示，本申请实施例提供了一种电池模块M，其包括多个电池单体3和框架结构2，其中，电池单体3可以为能够重复充放电使用的二次电池，多个电池单体3位于框架结构2的内腔，并在该内腔中相互堆叠设置。框架结构2包括侧板20和端板21，侧板20和端板21共同固定电池单体3，电池单体3之间通过电连接片1串联或并联。
如图4和图5所示，电池单体3至少包括电极组件32、壳体31和电极引线302，其中，壳体31可为六面体形，也可为其他形状，且该壳体31内部形成容纳腔，用于容纳电极组件32和电解液，电极引线302与电极组件32电连接。其中，壳体31可包括金属材料，例如铝或铝合金等，也可包括绝缘材料，例如塑胶等。
如图5所示，顶盖组件30包括顶盖板301和电极引线302，顶盖板301固定于壳体31的开口，从而将电极组件32和电解液封闭于壳体31的容纳腔，电极引线302设置于顶盖板301，顶盖板301设置有防爆口303。
电池模块M还包括电连接片1，电连接片1将多个电池单体3的电极引线302电连接，以实现多个电池单体3之间的串联或并联。
如图6-图9所示，本申请实施例提供了一种用于电池模块M的电连接片1，其包括第一部分10和第二部分11；第一部分10包括本体部101和增流部102，本体部101设置有避让区101a，增流部102位于避让区101a周围设定的区域；第二部分11连接于本体部101端部并用于与电池单体3连接。
电连接片1在连接到电池单体3时，为了避让电池单体3的部件， 例如防爆口303设置的防爆阀，需要在电连接片1上设置避让区101a，当设置避让区101a之后，电连接片1的过流能力降低，导致温升过高，容易引发安全问题。
本申请实施例提供的电连接片1中，设置避让区101a的本体部101处，由于面积变小，因此过流面积也变小，因此在避让区101a周围设定的区域设置增流部102，从而增大了过流面积，有效地改善了电连接片1的过流能力。
可以理解的是，增流部102可以根据实际情况，位于避让区101a周围设定的区域，例如，可以是以避让区101a的中心为中心，半径为设定值的区域内，也可以是以避让区101a的某个基准边作为基准，延伸出设定的距离等，在此不作限定。
本实施例中，如图8所示，第一部分10和第二部分11为一体式结构，方便电连接片1的加工制造。具体的，电连接片1可以为金属材料制成的板状或片状结构。更具体的，在本实施例中，第一部分10的增流部102与本体部101一体成型，即增流部102与本体部101分别为电连接片1整体的一部分。
具体地，可通过剪裁工艺制造电连接片1。首先，根据设计需求，通过剪裁金属板或金属片，得到如图8所示的电连接片1，此时，电连接片1的第一部分10的两个端部分别连接两个第二部分11，增流部102连接于本体部101侧壁。然后沿着本体部101的侧壁弯折增流部102，使得增流部102与本体部101贴合设置。即将通过剪切得到的增流部102弯折后压平，使增流部102与本体部101贴紧，得到如图7所示的电连接片1，此时，沿所述电连接片1的厚度方向H，增流部102连接于本体部101的一侧。通过弯折增流部102可节省电池模组M宽度方向和高度方向上的 空间，并且与增流部102弯折后与本体部101形成一定角度相比较，与本体部101贴合设置，成型工艺更优，能更准确地控制电连接片1弯折后的形状和位置。还可以减短过流路径，增加贴合部位的过流截面积，从而降低电连接片1的电阻，降低温升。
还需要说明的是，增流部102的形状可以设置为矩形、梯形或异形，只要增流部102不超过本体部101和第二部分11的边缘即可，这便于电连接片1的制造，避免剪切过程中产生过多费料，造成材料浪费。
当然，也可以通过铸造或机加工工艺一体制造电连接片1，沿电连接片1的厚度方向H，局部做厚本体部101的一侧，以形成增流部102。
本申请实施例中，本体部101包括第一本体部101b和连接段101d，避让区101a为开设于连接段101d的通孔或缺口。此时的第一本体部101b一端与一个第二部分11连接，另一端与连接段101d的一端连接，而连接段101d的另一端与另一个第二部分11连接。本实施例中，将避让区101a设置在连接段101d，避让区101a的形式可以是通孔或缺口，以对电池单体3的结构作出避让，增流部102b则可以设置于第一本体部101b。
当避让区101a设置为缺口时，可以对连接段101d进行局部做窄，部分电池单体3的电极引线302处存在凸出的部分，而缺口与该凸出的部分相适配，方便了本体部101与电池单体3的连接，但是连接段101d设置缺口后，该处面积减小，该处的过流面积也变小，因此在缺口周围设定的区域设置增流部102，从而增大了过流面积，有效地改善了电连接片1的过流能力。
当避让区101a设置为通孔时，通孔的设置可以是为了避让电池单体3的防爆阀，因此在电连接片1上开孔，但开孔后该连接段101d的面积 减小，该处的过流面积也变小，因此在避让区101a周围设定的区域设置增流部102，从而增大了过流面积，有效地改善了电连接片1的过流能力。
如图6-图8所示，本申请实施例中，增流部102位于第一本体部101b，且增流部102的宽度H2小于第一本体部101b的宽度H1。电池模块M通常还包括线束隔离板，为了避免受到线束隔离板的限制，因此设置的增流部102的宽度小于第一本体部101b的宽度，从而有利于电池模块M的整体装配。可以理解的是，增流部102的宽度越接近第一本体部101b的宽度，电连接片1的过流面积越大。
作为一种具体的实现方式，本体部101还包括第二本体部101c，第一本体部101b和第二本体部101c通过连接段101d连接，增流部102位于第一本体部101b和/或第二本体部101c。如图6所示，增流部102为两个，分别位于第一本体部101b和第二本体部101c，该电连接片1一般位于电池模块M的中间位置处，用于将电池单体3的电极引线302电连接。也可以如图11所示，增流部102分别位于第一本体部101b和第二本体部101c，图11所示的电连接片1一般位于电池模块M的边缘处，用于将边缘位置的电池单体3的电极引线302电连接。
需要说明的是，在具有缺口的连接段101d的两侧均设置有增流部102，与在具有缺口的连接段101d的单侧设置有增流部102相比较，两侧均设置有增流部102的电连接片1的过流能力能提高更多。
如图10所示，第一本体部101b的两端分别连接有第一连接段101da和第二连接段101db，即连接段101d包括第一连接段101da和第二连接段101db，且第一连接段101da与第一本体部101b之间形成设定夹角，设定的夹角为90°，该电连接片1一般位于电池模块M的边缘处，用于将多个电池单体3的电极引线302电连接。在另一种具体的实施例 中，避让区101a为开设于连接段101d的通孔，且增流部102位于所述连接段101d。作为一种具体的实现方式，避让区101a为开设于第一连接段101da的通孔，且增流部102位于第一连接段101da。开有通孔的第一连接段101da的面积变小，该处的过流面积也变小，因此在避让区101a周围设定的区域设置增流部102，从而增大过流面积，有效地改善电连接片1的过流能力。
需要说明的是，增流部102包括第一增流部102a和第二增流部102b，第一增流部102a和第二增流部102b均位于第一连接段101da，沿第一连接段101da的宽度方向X1，第一增流部102a、通孔、第二增流部102b间隔排布。间隔排布便于电流的均衡分布，避免过流面积偏差过大，同时还便于在增流部102在电连接片1的厚度方向H上的尺寸调控。
具体的，在一种实施例中，第一增流部102a连接于第一连接段101da的侧壁，第二增流部102b连接与通孔的孔壁，通过弯折增流部102，使得第一增流部102a和第二增流部102b均与第一连接段101da贴合。第一增流部102a沿第一连接段101da的侧壁弯折，并朝向靠近通孔的方向延伸，使得第一增流部102a的边缘接近通孔的孔壁，但不遮挡通孔，第一增流部102a的宽度越接近通孔的孔壁，电连接片1的过流面积越大。第二增流部102b沿通孔的孔壁弯折，并朝向远离通孔的方向延伸，使得第二增流部102b接近第一连接段101da的侧壁，且第二增流部102b的宽度越接近第一连接段101da的边缘，电连接片1的过流面积越大。
进一步地，避让区101a为开设于第二连接段101db的缺口，即对第二连接段101db进行局部做窄，由于部分电池单体3的电极引线302存在凸出的部分，而缺口与该凸出的部分相适配，方便了本体部101与电池单体3的连接，但是第二连接段101db设置缺口后，该处面积减小，该处的 过流面积也变小，因此在缺口周围设定的区域设置增流部102，从而增大了过流面积，有效地改善了电连接片1的过流能力。
需要说明的是，增流部102还可以包括第三增流部102c，第三增流部102c位于第一本体部101b上，由于受到线束隔离板的限制，因此在第一本体部101b的宽度方向X2上，第三增流部102c的宽度小于第一本体部101b的宽度，但第三增流部102c的宽度接近第一本体部101b的宽度，提高电连接片1的过流面积。第二连接段101db上设置有缺口，缺口与第三增流部102c沿第一本体101b的长度方向X1排布，由于第一本体101b上设置有缺口，因此第三增流部102c的设置提高了电连接片1的过流能力。
如图11所示，第二部分11连接于第一部分10的一端，其中，本体部101包括第一本体部101b和第二本体部101c，第一本体部101b和第二本体部101c通过连接段101d连接，增流部102位于第一本体部101b和第二本体部101c。第二本体部101c的一端连接有第二部分11，第一本体部101b的一端连接于电池模块M的输出端。
本申请实施例中，在沿电连接片1的厚度方向H上，增流部102位于本体部101一侧，且增流部102位于本体部101的上方。在电连接片1连接于电池单体3时，在厚度方向H上，增流部102位于电连接片1上方，当然，也可以位于电连接片1下方，通过将增流部102设置为位于本体部101一侧，使电连接片1仅在高度方向上局部增厚，而不会对长度方向和宽度方向有影响，因此所占据的空间较小。
如图9所示，本申请实施例中，本体部101还设置有凹槽101e，凹槽101e位于增流部102的一侧或两侧。电连接片1的增流部102在弯折时，能够避免在弯折时电连接片1出现应力集中带来损伤，从而保证了弯 折后电连接片1的强度性能以及功能性。
具体的，可以在增流部102的两侧均设置凹槽101e，且凹槽101e的宽度大于1.2mm，进一步地避免在弯折时电连接片1出现应力集中的问题。
需要说明的是，凹槽101e的宽度一般设置为1.5mm。
结合以上对本申请的详细描述可以看出，本实施例提供的电连接片1包括第一部分10和第二部分11，其中第一部分10包括本体部101和增流部102，本体部101设置有连接段101d和避让区101a，且避让区101a为开设于连接段101d的通孔或缺口，增流部102位于通孔或缺口周围设定的区域，连接段101d设置缺口或通孔后，该处面积减小，该处的过流面积也变小，因此在缺口或通孔周围设定的区域设置增流部102，从而增大过流面积，有效地改善电连接片1的过流能力。
虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (11)

  1. 一种用于电池模块(M)的电连接片(1)，所述电池模块(M)包括电池单体(3)，其中，所述电连接片(1)包括第一部分(10)和第二部分(11)；
    所述第一部分(10)包括增流部(102)和设置避让区(101a)的本体部(101)；
    所述增流部(102)位于所述避让区(101a)周围设定的区域，沿所述电连接片的厚度方向(H)，所述增流部(102)连接于所述本体部(101)的一侧；
    所述第二部分(11)连接于所述本体部(101)端部并用于与电池单体(3)连接。
  2. 根据权利要求1所述的电连接片(1)，其中，所述本体部(101)包括第一本体部(101b)和连接段(101d)，所述避让区(101a)为开设于所述连接段(101d)的通孔或缺口。
  3. 根据权利要求2所述的电连接片(1)，其中，所述增流部(102)位于所述第一本体部(101b)，且所述增流部(102)的宽度小于所述第一本体部(101b)的宽度。
  4. 根据权利要求2所述的电连接片(1)，其中，所述本体部(101)还包括第二本体部(101c)，所述第一本体部(101b)和所述第二本体部(101c)通过所述连接段(101d)连接；
    所述增流部(102)位于所述第一本体部(101b)和/或所述第二本体部(101c)。
  5. 根据权利要求2所述的电连接片(1)，其中，所述避让区(101a)为开设于所述连接段(101d)的通孔，且所述增流部(102)位于所述连接段(101d)。
  6. 根据权利要求5所述的电连接片(1)，其中，所述增流部(102)包括第一增流部(102a)和第二增流部(102b)；
    沿所述连接段(101d)的宽度方向(X1),所述第一增流部(102a)、所述通孔和所述第二增流部(102b)间隔排布。
  7. 根据权利要求1-6任一项所述的电连接片(1)，其中，所述本体部(101)还设置有凹槽(101e)，所述凹槽(101e)位于所述增流部(102)的一侧或两侧。
  8. 根据权利要求1-7任一项所述的电连接片(1)，其中，所述增流部(102)与所述本体部(101)一体成型；
    所述增流部(102)沿本体部(101)的侧壁弯折，且所述本体部(101)和所述增流部(102)贴合。
  9. 一种电池模块(M)，包括多个电池单体(3)和权利要求1-8任一项所述的电连接片(1)；所述电连接片(1)的第二部分(11)将所述电池单体(3)的电极引线电连接。
  10. 一种电池组(P)，其中，包括权利要求9所述的电池模块(M)。
  11. 一种使用电池单体作为电源的装置，其中，包括，动力源，所述动力源用于为所述装置提供驱动力；被配置为向所述动力源提供电能的如权利要求9所述的电池模块(M)。
PCT/CN2020/123464 2019-11-04 2020-10-24 电连接片、电池模块、电池组及装置 WO2021088667A1 (zh)

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