WO2020155968A1 - 电池模块 - Google Patents

电池模块 Download PDF

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Publication number
WO2020155968A1
WO2020155968A1 PCT/CN2019/128667 CN2019128667W WO2020155968A1 WO 2020155968 A1 WO2020155968 A1 WO 2020155968A1 CN 2019128667 W CN2019128667 W CN 2019128667W WO 2020155968 A1 WO2020155968 A1 WO 2020155968A1
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WIPO (PCT)
Prior art keywords
electrode lead
battery
connection points
group
electrode
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/CN2019/128667
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English (en)
French (fr)
Inventor
刘小荣
赵宾
阳超
陈宗火
吴岸为
瞿志广
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Priority to KR1020217024294A priority Critical patent/KR102630674B1/ko
Priority to JP2021543399A priority patent/JP7314285B2/ja
Publication of WO2020155968A1 publication Critical patent/WO2020155968A1/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
    • H01M50/50—Current conducting connections for cells or 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
    • H01M50/204—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
    • 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
    • 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
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • 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
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • 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
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H01M50/557—Plate-shaped terminals
    • 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
    • H01M50/543—Terminals
    • H01M50/562—Terminals characterised by the material
    • 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 field of batteries, in particular to a battery module.
  • the secondary battery includes a first electrode lead and a second electrode lead. Since the voltage and current of a single battery are small, it is often necessary to connect them in series and parallel. In this case, a plurality of first electrode leads and a plurality of second electrode leads need to be stacked in sequence for connection. Because the materials of the first electrode lead and the second electrode lead are different, there are multiple different welding layers during welding, namely the first electrode lead and the first electrode lead welding layer, the first electrode lead and the second electrode lead welding layer, The second electrode lead is welded to the second electrode lead.
  • the welding temperature of the first electrode lead and the first electrode lead and the welding temperature of the second electrode lead and the second electrode lead are different.
  • the high temperature welding layer will affect the low temperature welding layer, causing excessive plastic flow during welding.
  • the formation of cavitation problems affects the welding strength.
  • the present application provides a battery module to improve the connection reliability of electrode leads in the battery module.
  • An embodiment of the application provides a battery module, which includes a first battery unit and a second battery unit.
  • the first battery unit and the second battery unit respectively include N secondary batteries, where N is an integer greater than or equal to 2, and each two
  • the secondary battery includes a first electrode lead and a second electrode lead with opposite polarities.
  • the melting point of the first electrode lead is different from the melting point of the second electrode lead.
  • the battery module has a first set of connection points and a second set of connection points.
  • connection points electrically connect the N first electrode leads of the first battery unit, a second group of connection points electrically connect the N second electrode leads of the second battery unit, the first group of connection points and the second group of connection points Displacement with each other;
  • the battery module also includes an electrical connector, and at least one first electrode lead of the first battery unit is connected to at least one second electrode lead of the second battery unit through the electrical connector.
  • both the first electrode lead and the second electrode lead extend in the first direction
  • the first electrode lead includes a first connection portion
  • the second electrode lead includes a second connection portion
  • the first battery cell The first connection part of the second battery unit and the second connection part of the second battery unit are arranged to avoid each other in the second direction, the second direction intersects the first direction, and the first set of connection points lead the N first electrodes of the first battery unit
  • the first connecting part of the second battery unit is connected with the electrical connector, and the second set of connecting points connects the second connecting part of the N second electrode leads of the second battery unit with the electrical connector.
  • the first electrode lead and the second electrode lead are both sheet-shaped leads, and the first electrode lead of the first battery cell and the second electrode lead of the second battery cell are mutually in the second direction. dislocation.
  • each secondary battery further includes a battery body, the first electrode lead is provided with a first root, the first root is connected to the battery body and the first connecting portion, and the second electrode lead is provided with a second The root portion, the second root portion connects the battery body and the second connecting portion, wherein, in the second direction, the size of the first connecting portion is smaller than the size of the first root portion, and the size of the second connecting portion is smaller than the size of the second root portion.
  • the size of the first connecting portion is less than half the size of the first root portion, and/or, in the second direction, the size of the second connecting portion is smaller than the second root portion Half the size.
  • the electrical connector is provided with a sheet-shaped electrical connection portion, the electrical connection portion includes a first electrical connection area and a second electrical connection area arranged in a second direction, and the first group of connection points The N first electrode leads are connected to the first electrical connection area, and the second set of connection points connect the N second electrode leads to the second electrical connection area.
  • a slot is provided between the first electrical connection area and the second electrical connection area.
  • the size of the slot in the second direction is greater than or equal to 0.1 mm.
  • the electrical connector is further provided with a support portion, the support portion is connected to the electrical connection portion and is bent relative to the electrical connection portion, the slot extends into the support portion, and a rounded structure is formed in the support portion.
  • the thickness of the electrical connection portion is greater than the thickness of the first electrode lead; and the thickness of the electrical connection portion is greater than the thickness of the second electrode lead.
  • the melting point of the first electrode lead is different from the melting point of the second electrode lead
  • the battery module has a first set of connection points for connecting N first electrode leads and a first set of connection points for connecting N second electrode leads.
  • Two groups of connection points, the first group of connection points and the second group of connection points are mutually misaligned, so that each group of connection points are only connected to electrode leads of the same melting point, which avoids that the connection points are connected to electrode leads of different melting points at the same time to meet the needs of welding high melting point electrodes
  • the influence of the welding temperature on the welding surface including the low-melting electrode leads during the lead wire thereby improving the welding strength at the connection points of each group and the connection reliability of the electrode leads of the battery module.
  • the electrical connector included in the battery module has a first electrical connection area and a second electrical connection area, the first electrical connection area is connected to the N first electrode leads, and the second electrical connection area is connected to the N A second electrode lead connection.
  • a slot is provided between the first electrical connection area and the second electrical connection area to prevent the mutual vibration of the welding process at the first electrical connection area and the welding process at the second electrical connection area during welding, and improve the welding quality .
  • FIG. 1 shows a three-dimensional schematic diagram of a battery module according to an embodiment of the present application
  • FIG. 2 shows a three-dimensional exploded view of the battery module of the embodiment of the present application
  • Fig. 3a shows a three-dimensional schematic diagram of an electrode lead connection structure according to an embodiment of the present application
  • 3b shows a perspective exploded view of an electrode lead connection structure according to an embodiment of the present application
  • FIG. 4 shows a three-dimensional schematic diagram of an electrical connector of an embodiment of the present application
  • FIG. 5 shows a three-dimensional exploded view of another electrode lead connection structure according to an embodiment of the present application.
  • FIG. 6 shows a three-dimensional exploded view of another electrode lead connection structure according to an embodiment of the present application.
  • G1-first battery unit G2-second battery unit
  • 121-first electrode lead 121a-first connection part; 121b-first root part;
  • 122-second electrode lead 122a-second connecting part; 122b-second root part;
  • 210-electrical connection part 211-first electrical connection area; 212-second electrical connection area;
  • FIG. 1 and FIG. 2 respectively show a three-dimensional schematic diagram and a three-dimensional exploded view of the battery module of the embodiment of the present application.
  • the battery module includes a first battery unit G1 and a second battery unit G2.
  • the first battery unit G1 and the second battery unit G2 respectively include N secondary batteries 100, where N is an integer greater than or equal to 2, and each secondary battery 100 It includes a first electrode lead 121 and a second electrode lead 122 with opposite polarities, and the melting point of the first electrode lead 121 is different from the melting point of the second electrode lead 122.
  • the secondary battery 100 may be a pouch-shaped secondary battery.
  • each first battery unit G1 includes two secondary batteries 100 and each second battery unit G2 also includes two secondary batteries 100 as an example for description.
  • Each first battery unit G1 includes two The two secondary batteries 100 are connected in parallel with each other, the two secondary batteries 100 included in each second battery unit G2 are connected in parallel with each other, and the first battery unit G1 and the second battery unit G2 are connected in series. It is understandable that, in some other embodiments, according to the design requirements of the battery module, the number of each first battery unit G1 including the secondary battery 100 can be three, four, etc., and the same applies to each second battery unit G1. The number of the battery cell G2 including the secondary battery 100 may be three, four, or other numbers.
  • the battery module may only include the first battery cell G1 and the second battery cell G2 connected in series, or the first battery cell G1 and the second battery cell G2 connected in series as repeating units, which are repeated in the thickness direction. They are stacked and formed in series, and in other embodiments, other battery cells may also be included.
  • melting point of the first electrode lead 121 and “melting point of the second electrode lead 122" herein can be specifically understood as the melting point of the surface material of the first electrode lead 121 and the surface material of the second electrode lead 122 The melting point.
  • the second motor lead 122 is made of aluminum material, and the melting point of the second electrode lead 122 is the melting point of the aluminum material; in some embodiments, the surface of the first electrode lead 121 is nickel plated with copper material. If formed, the melting point of the first electrode lead 121 is the melting point of the nickel material.
  • the first electrode lead 121 is made of copper material, and the surface of the first electrode lead 121 has a plating layer, such as nickel plating, so as to avoid the copper electrode lead and the sealing plastic included in the battery. Accelerated aging occurs between.
  • the second electrode lead 122 is made of aluminum material
  • the thickness of the diffusion area of the copper-aluminum welding is about 20 microns.
  • the thickness of the plating layer (for example, a nickel layer) on the surface of the first electrode lead 121 is greater than or equal to 20 microns. Micron, to ensure that only aluminum and nickel diffusion is welded, and to ensure consistent welding and stability.
  • the N secondary batteries 100 of the first battery cell G1 and the N secondary batteries 100 of the second battery cell G2 are respectively connected in parallel, and the first battery cell G1 and the second battery cell G2 are connected in series.
  • the N first electrode leads 121 of the first battery cell G1 and the N second electrode leads 122 of the second battery cell G2 can be electrically connected. The connection of the electrode leads will be described in detail in various embodiments below. structure.
  • Figures 3a and 3b respectively show a three-dimensional schematic diagram and a three-dimensional exploded view of an electrode lead connection structure according to an embodiment of the present application.
  • the battery module has a first group of connection points P1 and a second group of connection points P2.
  • the first group of connection points P1 electrically connect the N first electrode leads 121 of the first battery cell G1
  • the second group of connection points P2 connect the
  • the N second electrode leads 122 of the two battery cells G2 are electrically connected, and the first group of connection points P1 and the second group of connection points P2 are misaligned with each other.
  • the first group of connection points P1 includes one connection point
  • the second group of connection points P2 also includes one connection point for description.
  • the number of connection points included in the first group of connection points P1 may be two, three, or other values.
  • each connection point can be connected to all N first electrode leads 121, or it can be a number of connection points corresponding to a number of first electrodes less than N. Leads 121 and two or more connection points make N first electrode leads 121 electrically connected to each other.
  • the setting of the second group of connection points P2 is the same as the setting of the first group of connection points P1, and the number of connection points of the second group of connection points P2 and the number of connection points of the first group of connection points P1 can be the same or different .
  • connection points included in the aforementioned first group of connection points P1 and the second group of connection points P2 may be connection points formed in the welding process.
  • the welding process can be ultrasonic welding, and the metal parts are under a certain static pressure during the welding process. Ultrasonic high-frequency vibration causes friction and heat generation at the welded metal interface, causing it to shape and flow and finally reach the atomic stress range to form a metal bond.
  • the melting point of the first electrode lead 121 of each secondary battery 100 is greater than the melting point of the second electrode lead 122.
  • the temperature at which plastic flow is reached during welding (hereinafter referred to as welding temperature) is proportional to the melting point. Therefore, the welding temperature of the first electrode lead 121 is greater than that of the second electrode lead 122.
  • the first electrode lead 121 is the high melting point electrode lead
  • the second electrode lead 122 is a low melting point electrode lead.
  • the melting point of the high melting point electrode lead is recorded as T1
  • the melting point of the low melting point electrode lead is recorded as T2
  • T1-T2>50% T2 the welding stability of the low melting point electrode lead will be worse when welding the high melting point electrode lead. Big impact. Specifically, when high melting point and high melting point electrode leads and low melting point and low melting point electrode leads are welded at the same time, the welding temperature of the high melting point electrode leads is high, resulting in fast plastic flow during welding of the low melting point electrode leads, and cavitation is likely to occur.
  • the first group of connection points P1 and the second group of connection points P2 are misaligned with each other, so that each group of connection points are only connected to electrode leads with the same melting point, which prevents the connection points from being connected to electrode leads of different melting points at the same time.
  • the welding strength at the first set of connection points P1 and the second set of connection points P2 and the connection of the electrode leads of the battery module are improved reliability.
  • the battery module further includes an electrical connector 200. At least one first electrode lead 121 of the first battery cell G1 is connected to at least one second electrode lead 122 of the second battery cell G2 through the electrical connector 200, thereby realizing the above-mentioned electrode lead connection structure N first electrode leads 121 and N second electrode leads 122 are electrically connected.
  • the first electrode lead 121 and the second electrode lead 122 both extend along the first direction X.
  • the first electrode lead 121 includes a first connection portion 121a
  • the second electrode lead 122 includes a second connection portion 122a.
  • the first connecting portion 121a of the first battery unit G1 and the second connecting portion 122a of the second battery unit G2 are arranged to avoid each other in the second direction Y, and the second direction Y intersects the first direction X.
  • the second direction Y is perpendicular to the first direction X.
  • the first group of connection points P1 connect the first connection portions 121a of the N first electrode leads 121 of the first battery cell G1 with the electrical connector 200
  • the second group of connection points P2 connect the second battery cell
  • the second connecting portions 122 a of the N second electrode leads 122 of G2 are connected to the electrical connector 200.
  • the first connecting portion 121a of the first battery unit G1 and the second connecting portion 122a of the second battery unit G2 are arranged to avoid each other in the second direction Y, so that the first group of connection points P1 and the second group of connection points P2 are in the second Avoid each other in direction Y.
  • the first group of connection points P1 and the second group of connection points P2 can be formed in two or more weldings.
  • the manner in which the N first electrode leads 121 and the N second electrode leads 122 are electrically connected through the electrical connector 200 may not be limited to the above manner.
  • a partial number (at least one) of the first electrode leads 121 among the N first electrode leads 121 may be provided with a first interconnection portion, and this part of the first electrode leads 121 may pass through the first interconnection.
  • Part is connected to the electrical connector 200; part of the number (at least one) of the second electrode lead 122 in the N second electrode leads 122 may be provided with a second interconnection part, and the part of the second electrode lead 122 may pass through the second mutual
  • the connecting portion is connected with the electrical connector 200 so as to achieve electrical connection between the N first electrode leads 121 and the N second electrode leads 122.
  • each secondary battery 100 further includes a battery body 110.
  • the first electrode lead 121 is provided with a first root 121b, which connects the battery body 110 and the first connecting portion 121a;
  • the second electrode lead 122 is provided with a second root 122b, which connects the battery body 110 and the second root Connecting portion 122a.
  • the size of the first connecting portion 121a is smaller than the size of the first root portion 121b
  • the size of the second connecting portion 122a is smaller than the size of the second root portion 122b.
  • the first connecting portion 121a and the second connecting portion 122a may be obtained by cutting part of the structure on the strip-shaped or sheet-shaped electrode leads, respectively.
  • the size of the first root 121b of the first electrode lead 121 and the second root 122b of the second electrode lead 122 are the same, which improves the uniformity of manufacturing the first electrode lead 121 and the second electrode lead 122.
  • the first root portion 121b having a larger size relative to the first connecting portion 121a and the second root portion 122b having a larger size relative to the second connecting portion 122a can be used to improve heat dissipation performance.
  • the size of the first connecting portion 121a is less than half of the size of the first root portion 121b, and/or, in the second direction Y, the size of the second connecting portion 122a is smaller than The second root portion 122b is half the size, so as to avoid the overlapping of the first connection portion 121a of the first electrode lead 121 and the second connection portion 122a of the second electrode lead 122 in the above-mentioned electrode lead connection structure.
  • the electrical connector 200 is provided with a sheet-shaped electrical connector 210.
  • the electrical connector 200 is further provided with a supporting portion 220. It is connected to the electrical connection portion 210 and is bent relative to the electrical connection portion 210.
  • the electrical connection portion 210 includes a first electrical connection area 211 and a second electrical connection area 212 arranged along the second direction Y.
  • the first set of connection points P1 can connect the N first electrode leads 121 to the first electrical connection area 211
  • the second group of connection points P2 can connect the N second electrode leads 122 to the second electrical connection area 212, thereby achieving electrical connection between the N first electrode leads 121 and the N second electrode leads 122.
  • the thickness of the electrical connection portion 210 is greater than the thickness of the first electrode lead 121, and the thickness of the electrical connection portion 210 is greater than the thickness of the second electrode lead 122, so as to protect the first electrode lead 121 and the second electrode lead 122 during the welding process. Welding is free from cracking or damage.
  • a slot 230 is provided between the first electrical connection area 211 and the second electrical connection area 212 to prevent the welding process at the first electrical connection area 211 and the welding at the second electrical connection area 212 during welding.
  • the process of mutual vibration affects the welding quality.
  • the size of the slot 230 in the second direction Y is greater than or equal to 0.1 mm, thereby reducing the mutual vibration influence between the welding process at the first electrical connection area 211 and the welding process at the second electrical connection area 212. To within a reasonable range, to ensure qualified welding quality.
  • the slot 230 extends into the support portion 220, and a rounded structure 240 is formed in the support portion 220, thereby reducing the stress concentration at the slot 230 and avoiding the slot 230 caused by high-frequency vibration during welding. Fatigue cracking.
  • each first battery unit G1 includes two secondary batteries 100 and each second battery unit G2 also includes two secondary batteries 100 as an example.
  • the description It can be understood that the number of secondary batteries 100 included in each first battery cell G1 and each second battery cell G2 may also be other numbers.
  • FIG. 5 shows a three-dimensional exploded view of another electrode lead connection structure according to an embodiment of the present application.
  • Most of the structure of the electrode lead connection structure is substantially the same as the structure of the foregoing embodiment, and will not be detailed.
  • the difference from the foregoing embodiment is that in the battery module of this embodiment, each first battery unit G1 includes three secondary batteries 100, and each second battery unit G2 also includes three secondary batteries 100.
  • the three secondary batteries 100 included in each first battery cell G1 are connected in parallel, and the three secondary batteries 100 included in each second battery cell G2 are connected in parallel with each other.
  • the first battery cell G1 and the second battery cell are connected in parallel. Series connection between G2.
  • the battery module has a first group of connection points P1 and a second group of connection points P2.
  • the first group of connection points P1 electrically connects the three first electrode leads 121 of the first battery cell G1
  • the second group of connection points P2 connects the first
  • the three second electrode leads 122 of the two battery cells G2 are electrically connected, and the first group of connection points P1 and the second group of connection points P2 are misaligned with each other.
  • Both the first electrode lead 121 and the second electrode lead 122 extend along the first direction X.
  • the first electrode lead 121 includes a first connection portion 121a
  • the second electrode lead 122 includes a second connection portion 122a.
  • the first connecting portion 121a of the first battery unit G1 and the second connecting portion 122a of the second battery unit G2 are arranged to avoid each other in the second direction Y, and the second direction Y intersects the first direction X.
  • the second direction Y is perpendicular to the first direction X.
  • the battery module further includes an electrical connector 200.
  • the first set of connection points P1 connect the first connection portions 121a of the N first electrode leads 121 of the first battery cell G1 with the electrical connector 200
  • the second The group connection point P2 connects the second connection portions 122 a of the N second electrode leads 122 of the second battery cell G2 with the electrical connector 200.
  • the number of secondary batteries 100 included in each first battery unit G1 and each second battery unit G2 may not be limited to two or three, and other numbers may be used, which may be based on the design of the battery module. Needs adjustment. Therefore, the battery module can adjust the number of secondary batteries 100 and the number of electrode leads of the first battery cell G1 and the second battery cell G2 according to design requirements, thereby improving the flexibility of the battery module design.
  • the two or more first electrode leads 121 included in each first battery cell G1 are electrically connected to each other through the first set of connection points P1, and the two or more second electrode leads 122 included in each second battery cell G2 all pass through the second
  • the group connection points P2 are electrically connected to each other, and the electrical connector 200 electrically connects at least one first electrode lead 121 and at least one second electrode lead 122, thereby realizing all the first electrode leads 121 of the first battery unit G1 and the second battery All the second electrode leads 122 of the cell G2 are electrically connected.
  • the first group of connection points P1 and the second group of connection points P2 can be separately formed in two or more weldings, thereby improving the flexibility and convenience of welding.
  • the first electrode lead 121 is provided with a first root 121b and a first connection portion 121a
  • the second electrode lead 122 is provided with a second root 122b and a second connection portion. 122a.
  • the size of the first connection portion 121a is smaller than the size of the first root portion 121b
  • the size of the second connection portion 122a is smaller than the size of the second root portion 122b, so that the first electrode lead 121 in the electrode lead connection structure
  • the first connection portion 121a of the second electrode lead 122 and the second connection portion 122a of the second electrode lead 122 are arranged to avoid each other.
  • the first connection portion 121a of the first electrode lead 121 and the second connection portion 122a of the second electrode lead 122 may avoid each other in other ways.
  • the first connection portion 121a is located on the side of the first electrode lead 121 in the second direction Y and protrudes in the second direction Y relative to the second electrode lead 122;
  • the second connection portion 122a is located in the second direction of the second electrode lead 122 The other side of Y.
  • the opposite first electrode lead 121 protrudes on the other side of the second direction Y to realize the mutual avoidance of the first connection portion 121a and the second connection portion 122a.
  • FIG. 6 shows a three-dimensional exploded view of another electrode lead connection structure of an embodiment of the present application.
  • the first electrode lead 121 and the second electrode lead 122 are both sheet-shaped leads, which may be specifically A rectangular sheet-shaped lead extending in the first direction X.
  • the first electrode lead 121 of the first battery cell G1 and the second electrode lead 122 of the second battery cell G2 are misaligned in the second direction Y, so that the first connection portion 121a and the second electrode lead 121 provided on the first electrode lead 121
  • the second connecting portions 122a provided on the two electrode leads 122 are offset from each other in the second direction Y.
  • the battery module of this embodiment includes an electrical connector 200.
  • the electrical connector 200 is provided with a sheet-shaped electrical connector 210.
  • the electrical connector 210 includes a first electrical connection area 211 and a second electrical connection area arranged along the second direction Y. 212.
  • the position of the first electrode lead 121 of the first battery cell G1 and the size in the second direction Y may correspond to the position of the first electrical connection region 211 and the size in the second direction Y; the second battery cell G2
  • the position of an electrode lead 122 and the size in the second direction Y may correspond to the position of the second electrical connection region 212 and the size in the second direction Y.
  • the first group of connection points P1 can connect the N first electrode leads 121 to the first electrical connection area 211, and the second group of connection points P2 can connect the N second electrode leads 122 to the second electrical connection area 212 to achieve The N first electrode leads 121 and the N second electrode leads 122 are electrically connected.
  • the sheet-shaped first electrode lead 121 and the second electrode lead 122 are misaligned, so that the first group of connection points P1 and the second group of connection points P2 are misaligned, so that each group of connection points is only connected to electrode leads with the same melting point, avoiding connection
  • each group of connection points is only connected to electrode leads with the same melting point, avoiding connection
  • welding temperature on the welding surface including low melting electrode leads when welding high melting point electrode leads, so as to improve the welding strength at each group of connection points and the reliable connection of the electrode leads of the battery module Sex.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

公开了一种电池模块，电池模块包括第一电池单元以及第二电池单元，第一电池单元以及第二电池单元分别包括N个二次电池，N为大于等于2的整数，每个二次电池包括极性相反的第一电极引线和第二电极引线，第一电极引线的熔点与第二电极引线的熔点不同；其中，电池模块具有第一组连接点、第二组连接点，第一组连接点将第一电池单元的N个第一电极引线电连接，第二组连接点将第二电池单元的N个第二电极引线电连接，第一组连接点和第二组连接点相互错位。本申请实施例的电池模块中每组连接点仅连接同样熔点的电极引线，提高了各组连接点处的焊接强度以及电池模块的电极引线的连接可靠性。

Description

电池模块
相关申请的交叉引用
本申请要求2019年1月28日提交的、申请号为201920147139.7、发明名称为“电池模组”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电池领域，具体涉及一种电池模块。
背景技术
现有的二次电池之间通常采用U型连接片相互电连接，在实际操作过程中，U型连接片的一侧与相应的二次电池的电极引线焊接完成后，其另一侧在与相应的二次电池的电极引线进行焊接时，超声波的振动必定会拉扯先前的焊接区域，影响焊接强度，进而影响电池模块的使用安全及使用寿命。
为了避免二次焊接的第二次焊接对第一次焊接的影响，因此采用一次焊接，将需要电连接的电极引线弯折到一起进行焊接。二次电池包括第一电极引线和第二电极引线。由于单个电池的电压电流较小，常常需要对其进行串并联，此时需要多个第一电极引线和多个第二电极引线依次层叠进行连接。由于第一电极引线与第二电极引线的材质不同，焊接时，具有多个不同的焊接层，即第一电极引线与第一电极引线焊接层、第一电极引线与第二电极引线焊接层、第二电极引线与第二电极引线焊接层。超声波焊接时，第一电极引线与第一电极引线焊接以及第二电极引线与第二电极引线焊接的温度不同，温度高的焊接层会影响温度低的焊接层，造成焊接时，塑性流动过度，形成空穴问题，影响焊接强度。
发明内容
本申请提供一种电池模块，提高电池模块中电极引线的连接可靠性。
本申请实施例提供一种电池模块，其包括第一电池单元以及第二电池单元，第一电池单元以及第二电池单元分别包括N个二次电池，N为大于等于2的整数，每个二次电池包括极性相反的第一电极引线和第二电极引线，第一电极引线的熔点与第二电极引线的熔点不同；其中，电池模块具有第一组连接点、第二组连接点，第一组连接点将第一电池单元的N个第一电极引线电连接，第二组连接点将第二电池单元的N个第二电极引线电连接，第一组连接点和第二组连接点相互错位；电池模块还包括电连接件，第一电池单元的至少一个第一电极引线通过电连接件与第二电池单元的至少一个第二电极引线连接。
根据本申请的前述任一实施方式，第一电极引线、第二电极引线均沿第一方向延伸，第一电极引线包括第一连接部，第二电极引线包括第二连接部，第一电池单元的第一连接部与第二电池单元的第二连接部在第二方向上相互避让设置，第二方向与第一方向相交，第一组连接点将第一电池单元的N个第一电极引线的第一连接部与电连接件连接，第二组连接点将第二电池单元的N个第二电极引线的第二连接部与电连接件连接。
根据本申请的前述任一实施方式，第一电极引线、第二电极引线均为片状引线，第一电池单元的第一电极引线与第二电池单元的第二电极引线在第二方向上相互错位。
根据本申请的前述任一实施方式，每个二次电池还包括电池主体，第一电极引线设置有第一根部，第一根部连接电池主体与第一连接部，第二电极引线设置有第二根部，第二根部连接电池主体与第二连接部，其中，在第二方向上，第一连接部的尺寸小于第一根部的尺寸，第二连接部的尺寸小于第二根部的尺寸。
根据本申请的前述任一实施方式，在第二方向上，第一连接部的尺寸小于第一根部尺寸的一半，和/或，在第二方向上，第二连接部的尺寸小于第二根部尺寸的一半。
根据本申请的前述任一实施方式，电连接件设置有片状的电连接部， 电连接部包括沿第二方向排列的第一电连接区和第二电连接区，第一组连接点将N个第一电极引线与第一电连接区连接，第二组连接点将N个第二电极引线与第二电连接区连接。
根据本申请的前述任一实施方式，第一电连接区与第二电连接区之间开设有开槽。
根据本申请的前述任一实施方式，开槽在第二方向上的尺寸大于等于0.1毫米。
根据本申请的前述任一实施方式，电连接件还设有支撑部，支撑部与电连接部连接且相对电连接部弯折，开槽延伸至支撑部内，并在支撑部形成圆角结构。
根据本申请的前述任一实施方式，电连接部的厚度大于第一电极引线的厚度；且电连接部的厚度大于第二电极引线的厚度。
根据本申请实施例的电池模块，第一电极引线的熔点与第二电极引线的熔点不同，电池模块具有连接N个第一电极引线的第一组连接点、连接N个第二电极引线的第二组连接点，第一组连接点和第二组连接点相互错位，使得每组连接点仅连接同样熔点的电极引线，避免了连接点同时连接熔点不同电极引线时、为满足焊接高熔点电极引线时焊接温度对包括低熔点电极引线的焊接面的影响，从而提高各组连接点处的焊接强度以及电池模块的电极引线的连接可靠性。
在一些可选的实施例中，电池模块包括的电连接件具有第一电连接区和第二电连接区，第一电连接区与N个第一电极引线连接，第二电连接区与N个第二电极引线连接。其中，第一电连接区与第二电连接区之间开设有开槽，从而防止焊接时第一电连接区处的焊接过程与第二电连接区处的焊接过程相互振动影响，提高焊接质量。
附图说明
通过阅读以下参照附图对非限制性实施例所作的详细描述，本申请的其它特征、目的和优点将会变得更明显，其中，相同或相似的附图标记表示相同或相似的特征。
图1示出本申请实施例的电池模块的立体示意图；
图2示出本申请实施例的电池模块的立体分解图；
图3a示出本申请实施例的一种电极引线连接结构的立体示意图；
图3b示出本申请实施例的一种电极引线连接结构的立体分解图；
图4示出本申请实施例的电连接件的立体示意图；
图5示出本申请实施例的另一种电极引线连接结构的立体分解图；
图6示出本申请实施例的又一种电极引线连接结构的立体分解图。
图中：
G1-第一电池单元；G2-第二电池单元；
P1-第一组连接点；P2-第二组连接点；
X-第一方向；Y-第二方向；
100-二次电池；
110-电池主体；
121-第一电极引线；121a-第一连接部；121b-第一根部；
122-第二电极引线；122a-第二连接部；122b-第二根部；
200-电连接件；
210-电连接部；211-第一电连接区；212-第二电连接区；
220-支撑部；
230-开槽；
240-圆角结构。
具体实施方式
下面将详细描述本申请的各个方面的特征和示例性实施例，为了使本申请的目的、技术方案及优点更加清楚明白，以下结合附图及具体实施例，对本申请进行进一步详细描述。应理解，此处所描述的具体实施例仅被配置为解释本申请，并不被配置为限定本申请。对于本领域技术人员来说，本申请可以在不需要这些具体细节中的一些细节的情况下实施。下面对实施例的描述仅仅是为了通过示出本申请的示例来提供对本申请更好的理解。
需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用 来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
应当理解，在描述部件的结构时，当将一层、一个区域称为位于另一层、另一个区域“上面”或“上方”时，可以指直接位于另一层、另一个区域上面，或者在其与另一层、另一个区域之间还包含其它的层或区域。并且，如果将部件翻转，该一层、一个区域将位于另一层、另一个区域“下面”或“下方”。
本申请实施例提供一种电池模块，图1、图2分别示出本申请实施例的电池模块的立体示意图、立体分解图。该电池模块包括第一电池单元G1以及第二电池单元G2，第一电池单元G1以及第二电池单元G2分别包括N个二次电池100，N为大于等于2的整数，每个二次电池100包括极性相反的第一电极引线121和第二电极引线122，第一电极引线121的熔点与第二电极引线122的熔点不同。在本实施例中，二次电池100可以为袋状二次电池。
本实施例中以每个第一电池单元G1包括两个二次电池100、每个第二电池单元G2也包括两个二次电池100为例进行说明，每个第一电池单元G1包括的两个二次电池100之间相互并联，每个第二电池单元G2包括的两个二次电池100之间相互并联，第一电池单元G1与第二电池单元G2之间进行串联连接。可以理解的是，在其它一些实施例中，根据电池模块的设计需要，每个第一电池单元G1包括二次电池100的数量可以是三个、四个等其它数目，同理每个第二电池单元G2包括二次电池100的数量可以是三个、四个等其它数目。
此外，电池模块可以仅包括串联连接的第一电池单元G1和第二电池 单元G2，也可以是以串联连接的第一电池单元G1和第二电池单元G2为重复单元，在厚度方向上进行重复堆叠并串联形成，在其它一些实施例中，还可以包括其它的电池单元。
需要说明的是，本文中的术语“第一电极引线121的熔点”、“第二电极引线122的熔点”，具体可以理解为第一电极引线121表面材料的熔点、第二电极引线122表面材料的熔点。例如，在一些实施例中，第二电机引线122为铝材料制成，第二电极引线122的熔点即铝材料的熔点；在一些实施例中，第一电极引线121为铜材料的表面镀镍形成，则第一电极引线121的熔点即镍材料的熔点。
如上所述，在一些实施例中，第一电极引线121为铜材料制成，并且第一电极引线121的表面具有镀层，例如是镀镍，从而避免铜制电极引线与电池中包括的密封塑料之间发生加速老化的现象。当第二电极引线122为铝材料制成时，由于铜铝焊接的扩散区域厚度约20微米，在一些实施例中，第一电极引线121表面的镀层(例如是镍层)的厚度大于等于20微米，以保证焊接仅有铝镍扩散，保证焊接一致型和稳定性。
如上所述，第一电池单元G1的N个二次电池100、第二电池单元G2的N个二次电池100分别并联，第一电池单元G1与第二电池单元G2之间进行串联连接。具体地，可以将第一电池单元G1的N个第一电极引线121和第二电池单元G2的N个第二电极引线122电连接，以下将通过多种实施方式具体描述该处电极引线的连接结构。
图3a、图3b分别示出本申请实施例的一种电极引线连接结构的立体示意图、立体分解图。电池模块具有第一组连接点P1、第二组连接点P2，其中，第一组连接点P1将第一电池单元G1的N个第一电极引线121电连接，第二组连接点P2将第二电池单元G2的N个第二电极引线122电连接，第一组连接点P1和第二组连接点P2相互错位。
需要说明的是，在图3a、图3b所示实施例中，以第一组连接点P1包括一个连接点、第二组连接点P2也包括一个连接点为例进行说明。然而，在其它一些实施例中，第一组连接点P1包括的连接点的数量可以是两个、三个等其它数值。当第一组连接点P1包括的连接点数量为两个以上时，可 以是每个连接点连接全部N个第一电极引线121，也可以是一个连接点连接数量小于N的对应若干第一电极引线121，并且两个以上连接点使得N个第一电极引线121相互电连接。第二组连接点P2的设置与上述第一组连接点P1的设置同理，并且第二组连接点P2的连接点数量与第一组连接点P1的连接点数量可以相同，也可以不相同。
前述的第一组连接点P1、第二组连接点P2包括的连接点，可以是焊接过程中形成的连接点，其中焊接过程可以采用超声波焊接，焊接过程中使得金属件在一定静压力下，通过超声高频振动使焊接金属界面摩擦生热致其发生塑形流动最终达到原子应力范围形成金属键合。
本申请实施例中，每个二次电池100的第一电极引线121的熔点大于第二电极引线122的熔点，当第一电极引线121的熔点大于第二电极引线122之间的熔点时，由于焊接时达到塑性流动时的温度(以下简称焊接温度)与熔点成正比，因此第一电极引线121的焊接温度大于第二电极引线122的焊接温度，此时第一电极引线121即高熔点电极引线，第二电极引线122即低熔点电极引线。
如果高熔点电极引线的熔点记为T1，低熔点电极引线的熔点记为T2，当T1-T2＞50％T2时，焊接高熔点电极引线时会对焊接低熔点电极引线的焊接稳定性造成较大的影响。具体的，高熔点与高熔点电极引线、低熔点与低熔点电极引线同时焊接时，高熔点电极引线的焊接温度高，导致低熔点电极引线焊接时塑性流动快，容易产生空穴等问题。
根据本申请实施例的电池模块，第一组连接点P1和第二组连接点P2相互错位，使得每组连接点仅连接同样熔点的电极引线，避免了连接点同时连接熔点不同电极引线时、为满足焊接高熔点电极引线时焊接温度对包括低熔点电极引线的焊接面的影响，从而提高第一组连接点P1处、第二组连接点P2处的焊接强度以及电池模块的电极引线的连接可靠性。
电池模块还包括电连接件200，第一电池单元G1的至少一个第一电极引线121通过电连接件200与第二电池单元G2的至少一个第二电极引线122连接，从而实现上述电极引线连接结构中N个第一电极引线121与N个第二电极引线122的电连接。
在本实施例中，第一电极引线121、第二电极引线122均沿第一方向X延伸。第一电极引线121包括第一连接部121a，第二电极引线122包括第二连接部122a。其中第一电池单元G1的第一连接部121a与第二电池单元G2的第二连接部122a在第二方向Y上相互避让设置，第二方向Y与第一方向X相交。在一些实施例中，第二方向Y与第一方向X垂直。
在本实施例中，第一组连接点P1将第一电池单元G1的N个第一电极引线121的第一连接部121a与电连接件200连接，第二组连接点P2将第二电池单元G2的N个第二电极引线122的第二连接部122a与电连接件200连接。
第一电池单元G1的第一连接部121a与第二电池单元G2的第二连接部122a在第二方向Y上相互避让设置，使得第一组连接点P1、第二组连接点P2在第二方向Y上相互避让。第一组连接点P1、第二组连接点P2可以在两次以上焊接中分别形成。
需要说明的是，通过电连接件200将N个第一电极引线121与N个第二电极引线122电连接的方式可以不限于上述方式。在其它一些实施例中，N个第一电极引线121中的部分数量(至少一个)的第一电极引线121可以设有第一互连部，该部分第一电极引线121可以通过第一互连部与电连接件200连接；N个第二电极引线122中的部分数量(至少一个)的第二电极引线122可以设有第二互连部，该部分第二电极引线122可以通过第二互连部与电连接件200连接，从而实现N个第一电极引线121与N个第二电极引线122的电连接。
请同时参考图1至图3b，在一些实施例中，每个二次电池100还包括电池主体110。第一电极引线121设置有第一根部121b，第一根部121b连接电池主体110与第一连接部121a；第二电极引线122设置有第二根部122b，第二根部122b连接电池主体110与第二连接部122a。
其中，在第二方向Y上，第一连接部121a的尺寸小于第一根部121b的尺寸，第二连接部122a的尺寸小于第二根部122b的尺寸。第一连接部121a、第二连接部122a分别可以是在条形、片状电极引线上裁切部分结构后得到。在第二方向Y上，第一电极引线121的第一根部121b与第二电极 引线122的第二根部122b的尺寸相同，提高第一电极引线121、第二电极引线122的制造统一性，此外相对于第一连接部121a尺寸更大的第一根部121b、相对于第二连接部122a尺寸更大的第二根部122b能够用于提高散热性能。
进一步地在一些实施例中，在第二方向Y上，第一连接部121a的尺寸小于第一根部121b尺寸的一半，和/或，在第二方向Y上，第二连接部122a的尺寸小于第二根部122b尺寸的一半，从而避免在上述电极引线连接结构中第一电极引线121的第一连接部121a与第二电极引线122的第二连接部122a发生重叠。
图4示出本申请实施例的电连接件的立体示意图，电连接件200设置有片状的电连接部210，在一些实施例中，电连接件200还设有支撑部220，支撑部220与电连接部210连接且相对电连接部210弯折。
电连接部210包括沿第二方向Y排列的第一电连接区211和第二电连接区212，第一组连接点P1可以将N个第一电极引线121与第一电连接区211连接，第二组连接点P2可以将N个第二电极引线122与第二电连接区212连接，从而实现N个第一电极引线121与N个第二电极引线122的电连接。
其中，电连接部210的厚度大于第一电极引线121的厚度，且电连接部210的厚度大于第二电极引线122的厚度，以保护第一电极引线121、第二电极引线122在焊接过程中焊接免于开裂或损伤。
本实施例中，第一电连接区211与第二电连接区212之间开设有开槽230，从而防止焊接时第一电连接区211处的焊接过程与第二电连接区212处的焊接过程相互振动影响，提高焊接质量。
在一些实施例中，开槽230在第二方向Y上的尺寸大于等于0.1毫米，从而将第一电连接区211处的焊接过程与第二电连接区212处的焊接过程相互的振动影响降至合理范围内，保证合格的焊接质量。
在一些实施例中，开槽230延伸至支撑部220内，并在支撑部220形成圆角结构240，从而减少开槽230部位的应力集中以避免焊接时的高频振动造成的开槽230处的疲劳开裂。
在上述图3a、图3b示出的电极引线连接结构中，以每个第一电池单元G1包括两个二次电池100、每个第二电池单元G2也包括两个二次电池100为例进行了说明。可以理解的是，每个第一电池单元G1、每个第二电池单元G2分别包括的二次电池100也可以是其它数量。
图5示出本申请实施例的另一种电极引线连接结构的立体分解图，该电极引线连接结构中大部分结构与前述实施例的结构大致相同，不再详述。其中，与前述实施例不同的是，本实施例的电池模块中，每个第一电池单元G1包括三个二次电池100、每个第二电池单元G2也包括三个二次电池100。
每个第一电池单元G1包括的三个二次电池100之间相互并联，每个第二电池单元G2包括的三个二次电池100之间相互并联，第一电池单元G1与第二电池单元G2之间进行串联连接。
电池模块具有第一组连接点P1、第二组连接点P2，其中，第一组连接点P1将第一电池单元G1的三个第一电极引线121电连接，第二组连接点P2将第二电池单元G2的三个第二电极引线122电连接，第一组连接点P1和第二组连接点P2相互错位。
第一电极引线121、第二电极引线122均沿第一方向X延伸。第一电极引线121包括第一连接部121a，第二电极引线122包括第二连接部122a。其中第一电池单元G1的第一连接部121a与第二电池单元G2的第二连接部122a在第二方向Y上相互避让设置，第二方向Y与第一方向X相交。在一些实施例中，第二方向Y与第一方向X垂直。
电池模块还包括电连接件200，在本实施例中，第一组连接点P1将第一电池单元G1的N个第一电极引线121的第一连接部121a与电连接件200连接，第二组连接点P2将第二电池单元G2的N个第二电极引线122的第二连接部122a与电连接件200连接。
可以理解的是，每个第一电池单元G1、每个第二电池单元G2分别包括的二次电池100的数量可以不限于两个、三个，还可以是其它数量，可以根据电池模块的设计需要调整。因此，电池模块可以根据设计需要对第一电池单元G1、第二电池单元G2的二次电池100数量以及电极引线数量 进行调整，提高电池模块设计的灵活性。
每个第一电池单元G1包括的两个以上第一电极引线121均通过第一组连接点P1相互电连接，每个第二电池单元G2包括的两个以上第二电极引线122均通过第二组连接点P2相互电连接，电连接件200又将至少一个第一电极引线121与至少一个第二电极引线122电连接，从而实现第一电池单元G1的全部第一电极引线121与第二电池单元G2的全部第二电极引线122的电连接。第一组连接点P1、第二组连接点P2可以在两次以上焊接中分别形成，从而提高焊接时的灵活性以及便捷性。
在上述图3a、图3b示出的电极引线连接结构中，第一电极引线121设置有第一根部121b和第一连接部121a，第二电极引线122设置有第二根部122b和第二连接部122a。其中，在第二方向Y上，第一连接部121a的尺寸小于第一根部121b的尺寸，第二连接部122a的尺寸小于第二根部122b的尺寸，使得电极引线连接结构中第一电极引线121的第一连接部121a与第二电极引线122的第二连接部122a相互避让设置。在其它一些实施例中，也可以通过其它方式实现第一电极引线121的第一连接部121a与第二电极引线122的第二连接部122a的相互避让。例如，第一连接部121a位于第一电极引线121的第二方向Y一侧，且相对第二电极引线122在第二方向Y突出；第二连接部122a位于第二电极引线122的第二方向Y的另一侧。相对第一电极引线121在第二方向Y的另一侧突出，以实现第一连接部121a与第二连接部122a的相互避让。
图6示出本申请实施例的又一种电极引线连接结构的立体分解图，在图6所示实施例中，第一电极引线121、第二电极引线122均为片状引线，具体可以是沿第一方向X上延伸的矩形片状引线。其中，第一电池单元G1的第一电极引线121与第二电池单元G2的第二电极引线122在第二方向Y上相互错位，使得第一电极引线121上设置的第一连接部121a与第二电极引线122上设置的第二连接部122a在第二方向Y上相互错位。
本实施例的电池模块包括电连接件200，电连接件200设置有片状的电连接部210，电连接部210包括沿第二方向Y排列的第一电连接区211和第二电连接区212。第一电池单元G1的第一电极引线121的位置以及在 第二方向Y上的尺寸可以与第一电连接区211的位置以及在第二方向Y上的尺寸对应；第二电池单元G2的第一电极引线122的位置以及在第二方向Y上的尺寸可以与第二电连接区212的位置以及在第二方向Y上的尺寸对应。
第一组连接点P1可以将N个第一电极引线121与第一电连接区211连接，第二组连接点P2可以将N个第二电极引线122与第二电连接区212连接，从而实现N个第一电极引线121与N个第二电极引线122的电连接。片状的第一电极引线121、第二电极引线122相互错位，使得第一组连接点P1和第二组连接点P2相互错位，使得每组连接点仅连接同样熔点的电极引线，避免了连接点同时连接熔点不同电极引线时、为满足焊接高熔点电极引线时焊接温度对包括低熔点电极引线的焊接面的影响，从而提高各组连接点处的焊接强度以及电池模块的电极引线的连接可靠性。
依照本申请如上文所述的实施例，这些实施例并没有详尽叙述所有的细节，也不限制该申请仅为所述的具体实施例。显然，根据以上描述，可作很多的修改和变化。本说明书选取并具体描述这些实施例，是为了更好地解释本申请的原理和实际应用，从而使所属技术领域技术人员能很好地利用本申请以及在本申请基础上的修改使用。本申请仅受权利要求书及其全部范围和等效物的限制。

Claims (10)

  1. 一种电池模块，包括第一电池单元(G1)以及第二电池单元(G2)，所述第一电池单元(G1)以及所述第二电池单元(G2)分别包括N个二次电池(100)，N为大于等于2的整数，每个所述二次电池(100)包括极性相反的第一电极引线(121)和第二电极引线(122)，所述第一电极引线(121)的熔点与所述第二电极引线(122)的熔点不同；
    其中，所述电池模块具有第一组连接点、第二组连接点，所述第一组连接点将所述第一电池单元(G1)的N个所述第一电极引线(121)电连接，所述第二组连接点将所述第二电池单元(G2)的N个所述第二电极引线(122)电连接，所述第一组连接点和所述第二组连接点相互错位；所述电池模块还包括电连接件(200)，所述第一电池单元(G1)的至少一个所述第一电极引线(121)通过所述电连接件(200)与所述第二电池单元(G2)的至少一个所述第二电极引线(122)连接。
  2. 根据权利要求1所述的电池模块，其中，所述第一电极引线(121)、所述第二电极引线(122)均沿第一方向(X)延伸，所述第一电极引线(121)包括第一连接部(121a)，所述第二电极引线(122)包括第二连接部(122a)，所述第一电池单元(G1)的所述第一连接部(121a)与所述第二电池单元(G2)的所述第二连接部(122a)在第二方向(Y)上相互避让设置，所述第二方向(Y)与所述第一方向(X)相交，
    所述第一组连接点将所述第一电池单元(G1)的N个所述第一电极引线(121)的第一连接部(121a)与所述电连接件(200)连接，所述第二组连接点将所述第二电池单元(G2)的N个所述第二电极引线(122)的第二连接部(122a)与所述电连接件(200)连接。
  3. 根据权利要求2所述的电池模块，其中，所述第一电极引线(121)、所述第二电极引线(122)均为片状引线，所述第一电池单元(G1)的所述第一电极引线(121)与所述第二电池单元(G2)的所述第二电极引线(122)在所述第二方向(Y)上相互错位。
  4. 根据权利要求2所述的电池模块，其中，每个所述二次电池(100) 还包括电池主体(110)，所述第一电极引线(121)设置有第一根部(121b)，所述第一根部(121b)连接所述电池主体(110)与所述第一连接部(121a)，所述第二电极引线(122)设置有第二根部(122b)，所述第二根部(122b)连接所述电池主体(110)与所述第二连接部(122a)，
    其中，在所述第二方向(Y)上，所述第一连接部(121a)的尺寸小于所述第一根部(121b)的尺寸，所述第二连接部(122a)的尺寸小于所述第二根部(122b)的尺寸。
  5. 根据权利要求4所述的电池模块，其中，在所述第二方向(Y)上，所述第一连接部(121a)的尺寸小于所述第一根部(121b)尺寸的一半，
    和/或，在所述第二方向(Y)上，所述第二连接部(122a)的尺寸小于所述第二根部(122b)尺寸的一半。
  6. 根据权利要求2所述的电池模块，其中，所述电连接件(200)设置有片状的电连接部(210)，所述电连接部(210)包括沿所述第二方向(Y)排列的第一电连接区(211)和第二电连接区(212)，
    所述第一组连接点将N个所述第一电极引线(121)与所述第一电连接区(211)连接，所述第二组连接点将N个所述第二电极引线(122)与所述第二电连接区(212)连接。
  7. 根据权利要求6所述的电池模块，其中，所述第一电连接区(211)与所述第二电连接区(212)之间开设有开槽(230)。
  8. 根据权利要求7所述的电池模块，其中，所述开槽(230)在所述第二方向(Y)上的尺寸大于等于0.1毫米。
  9. 根据权利要求7所述的电池模块，其中，所述电连接件(200)还设有支撑部(220)，所述支撑部(220)与所述电连接部(210)连接且相对所述电连接部(210)弯折，所述开槽(230)延伸至所述支撑部(220)内，并在所述支撑部(220)形成圆角结构(240)。
  10. 根据权利要求7所述的电池模块，其中，所述电连接部(210)的厚度大于所述第一电极引线(121)的厚度；且所述电连接部(210)的厚度大于所述第二电极引线(122)的厚度。
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