WO2021115336A1 - 电芯模组及其连接方法、电芯总成及激光焊接工装 - Google Patents

电芯模组及其连接方法、电芯总成及激光焊接工装 Download PDF

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Publication number
WO2021115336A1
WO2021115336A1 PCT/CN2020/134976 CN2020134976W WO2021115336A1 WO 2021115336 A1 WO2021115336 A1 WO 2021115336A1 CN 2020134976 W CN2020134976 W CN 2020134976W WO 2021115336 A1 WO2021115336 A1 WO 2021115336A1
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WIPO (PCT)
Prior art keywords
fixture
sub
battery
laser
tabs
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PCT/CN2020/134976
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English (en)
French (fr)
Inventor
郭伟华
刘丽荣
林桐华
邬亨英
刘献华
王斌斌
Original Assignee
孚能科技(镇江)有限公司
孚能科技(赣州)股份有限公司
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Application filed by 孚能科技(镇江)有限公司, 孚能科技(赣州)股份有限公司 filed Critical 孚能科技(镇江)有限公司
Priority to CN202090001091.XU priority Critical patent/CN219658930U/zh
Publication of WO2021115336A1 publication Critical patent/WO2021115336A1/zh

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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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • 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 invention relates to the technical field of batteries and battery installation, in particular to a battery cell module and a connection method thereof, a battery cell assembly and a laser welding tool.
  • the tabs of multiple battery cells are usually electrically connected by a bus bar, so as to realize the electrical connection between the multiple battery cells.
  • the size of the bus bar is usually larger, which increases the volume of the cell module, and because the manufacturing process of the bus bar is complicated, the production efficiency is low, and the production cost of the cell is increased. .
  • the purpose of the present invention is to overcome the problems in the prior art, which are caused by the arrangement of bus bars, that the battery cell module is larger in size, lower in production efficiency, and higher in manufacturing cost of the battery.
  • the first aspect of the present invention provides a battery cell module, which includes at least one battery cell group, each battery cell group includes a plurality of stacked battery cells, and every two adjacent battery cells
  • the tabs of the core are electrically connected in a direct contact manner to realize the electrical connection of a plurality of the battery cores.
  • each of the tabs includes a first part extending from the same side of the battery core and a second part bent relative to the first part; wherein, each of the two adjacent battery cores has a first part extending from the same side of the battery core and a second part bent relative to the first part.
  • the bending directions of the second parts of the tabs are the same and overlap each other.
  • the second parts of the tabs of two adjacent battery cores are partially staggered.
  • each battery which are a positive tab and a negative tab, and the bending directions of the second part of the positive tab and the negative tab are opposite, and
  • the bending directions of the second parts of the positive electrode tabs of every two adjacent battery cores are the same and overlap each other; the second parts of the negative electrode tabs of every two adjacent battery cores have the same bending direction.
  • the bending directions are the same and overlap each other, so as to realize the parallel connection of a plurality of the electric cores.
  • tabs for each battery cell which are a positive tab and a negative tab, and
  • the second part of the positive electrode tab of one of the battery cores and the second part of the negative electrode tab of the other battery core overlap each other, In order to realize the series connection of every two adjacent battery cores.
  • the tabs of every two adjacent battery cores are connected by laser welding.
  • the battery cell group is in multiple groups, and the multiple groups of the battery cell groups are arranged along the stacking direction of a plurality of the battery cells; and, each of the battery cores has two tabs, which are respectively The positive electrode tab and the negative electrode tab.
  • the positive electrode tabs of every two adjacent battery cores are electrically connected, and the negative electrode tabs of every two adjacent battery cores are electrically connected , In order to realize the parallel connection of a plurality of the battery cells; or, in every two adjacent battery cores, the positive electrode tab of one of the battery cores is electrically connected to the negative electrode tab of the other of the battery cores , In order to realize the series connection of every two adjacent batteries;
  • the positive electrode tabs of the battery cells in one of the battery cell groups are connected to a plurality of electrodes in the adjacent battery cell groups in the other group.
  • the negative electrode tabs of the battery cells are electrically connected to realize the series connection of two adjacent groups of the battery cells; or, the positive electrode tabs of the battery cells in the two adjacent groups of the battery cores are electrically connected,
  • the negative pole tabs of the battery cells in the adjacent two groups of the battery core groups are electrically connected to realize the parallel connection of the adjacent two groups of the battery core groups.
  • each cell there are two tabs for each cell, which are a positive tab and a negative tab, and they are located on opposite sides of the cell, and each cell has two tabs.
  • Both of the two tabs include a first part extending from the battery core and a second part bent relative to the first part; wherein, the second part of the tabs of every two adjacent battery cores Overlap each other
  • the first tab includes a first part extending from the battery core and a second part bent relative to the first part
  • the second tab It includes a first part extending from the battery core; wherein the second part of the first tab of each two adjacent battery cells overlaps each other, or the second part of each adjacent two battery cores The first part of the second tab is overlapped with each other.
  • the battery cell module includes at least one battery cell unit, and each battery cell unit includes multiple sets of the battery cell groups, and in each adjacent two sets of the battery cell groups, two adjacent battery cell groups Electrical connection of the tabs of the batteries;
  • the same side tab of each cell in one of the cell units and the other one of the cell are electrically connected in a one-to-one correspondence, so as to achieve electrical connection between two adjacent battery core units.
  • the second aspect of the present invention provides a battery cell assembly, which includes the above-mentioned battery cell module provided by the embodiment of the present invention.
  • a fireproof sheet is arranged between two adjacent battery cell modules.
  • a third aspect of the present invention provides a connection method of a battery cell module, the battery cell module adopts the above-mentioned battery cell module provided in the embodiment of the present invention, and the connection method includes:
  • the tabs of every two adjacent electric cores are electrically connected in a direct contact manner to realize the electrical connection of the plurality of electric cores.
  • the tabs of each two adjacent battery cells are electrically connected by laser welding.
  • each of the tabs includes a first part extending from the same side of the battery core and a second part bent relative to the first part; wherein, every two adjacent battery cores The bending directions of the second parts of the tabs are the same and overlap each other;
  • Said using laser welding to electrically connect the tabs of each two adjacent battery cells includes the following steps:
  • the laser welding tool includes a laser jig assembly, the laser jig assembly is located on the side of the second part close to the battery core, and is used to support the second part, And protect the second part and the components located on the side of the second part close to the battery core;
  • the fourth aspect of the present invention provides a laser welding tool, the laser welding tool is used to assist the use of laser welding to electrically connect the tabs of each two adjacent battery cells, each of the tabs includes A first part extending from the battery core on the same side and a second part bent relative to the first part; wherein the bending directions of the second parts of the tabs of every two adjacent battery cores are the same , And overlap each other;
  • the laser welding tool includes a laser jig assembly, the laser jig assembly is used to be located on the side of the second part close to the battery core during laser welding to support the second part and protect the The second part and a component located on a side of the second part close to the battery core.
  • the laser fixture assembly includes a first laser fixture and a second laser fixture, and both the first laser fixture and the second laser fixture are located near the second part during laser welding.
  • One side of the battery core, and the second laser fixture is located on the side of the first laser fixture away from the battery core, and both the first laser fixture and the second laser fixture are provided There is a slot for the first part to pass through;
  • the first laser fixture is used to absorb laser energy
  • the second laser jig is used to support the second part and is made of a laser-transmitting material.
  • the first laser fixture includes a first sub fixture and a second sub fixture
  • the second laser fixture includes a third sub fixture and a fourth sub fixture.
  • the first sub-fixture and the second sub-fixture are correspondingly set;
  • the slots include first sub-slots respectively arranged on the first sub-fixture and the second sub-fixture, and second sub-slots respectively arranged on the third sub-fixture and the fourth sub-fixture Sub-slot
  • the laser welding tooling also includes a first auxiliary component and a second auxiliary component, wherein the first auxiliary component is used to drive the first sub-fixture and the third sub-fixture to move synchronously, and the second The auxiliary component is used to drive the second sub-fixture and the fourth sub-fixture to move synchronously, so that the first sub-fixture and the second sub-fixture are docked or separated from each other, while the third sub-fixture The sub-fixture and the fourth sub-fixture are docked or separated from each other; and in the process of the first sub-fixture and the second sub-fixture being docked or separated from each other, the corresponding first part moves into or out of the office.
  • the laser fixture assembly includes a first laser fixture and a second laser fixture, wherein:
  • the first laser jig is located on the side of the second part close to the battery, and is provided with a slot for the first part to pass through, and the first laser jig is used to support the first part Two parts, and the first laser fixture is also provided with a laser avoidance groove;
  • the second laser jig is located on the side of the second part away from the battery core, and is used to press the second part, and corresponds to each of the second parts on the second laser jig There is a through slot for the laser to pass through at the position.
  • the first laser fixture includes a first sub fixture and a second sub fixture
  • the second laser fixture includes a third sub fixture and a fourth sub fixture.
  • the first sub-fixture and the second sub-fixture are correspondingly set;
  • the socket includes sub-slots respectively arranged on the first sub-fixture and the second sub-fixture;
  • the laser welding tooling also includes a first auxiliary component and a second auxiliary component, wherein the first auxiliary component is used to drive the first sub-fixture and the third sub-fixture to move synchronously, and the second The auxiliary component is used to drive the second sub-fixture and the fourth sub-fixture to move synchronously, so that the first sub-fixture and the second sub-fixture are close to or separated from each other, while the third sub-fixture The sub-fixture and the fourth sub-fixture are close to or separated from each other; and when the first sub-fixture and the second sub-fixture are close to or separated from each other, the corresponding first part moves in or out of the place Describe the sub-slot.
  • the laser welding tooling further includes a bottom plate, the battery cell module is arranged on the bottom plate, and a guide rail is arranged on the bottom plate, and the extension direction of the guide rail is the same as that of the plurality of battery cores.
  • the stacking directions are perpendicular to each other; both the first auxiliary component and the second auxiliary component are provided with a sliding structure that is slidably engaged with the guide rail, and the sliding structure is used to drive the first auxiliary component and the second auxiliary component along the The guide rail slides.
  • two splints are further provided on the bottom plate and located between the first auxiliary component and the second auxiliary component, and the two splints are arranged opposite to each other in the stacking direction of the plurality of electric cores , Used to clamp the battery module between the two.
  • the laser fixture assembly further includes a supporting and cooling mechanism, the supporting and cooling mechanism is connected with the first laser fixture, and the second laser fixture is connected with the first laser fixture;
  • the supporting and cooling mechanism is used for supporting the second laser fixture and the first laser fixture and cooling them.
  • the technical solutions of the battery cell module and its connection method, the battery cell assembly and the laser welding tool provided by the embodiment of the present invention can not only be realized by electrically connecting the tabs of every two adjacent battery cells in direct contact
  • the electrical connection of multiple cells ensures that the current-carrying requirements are met, and bus bars can be eliminated, so that the volume of cell modules can be reduced, the manufacturing process of the modules can be simplified, and the production efficiency can be improved, and the power consumption can be reduced.
  • the production cost of the core is not only be realized by electrically connecting the tabs of every two adjacent battery cells in direct contact.
  • Figure 1 is a structural diagram of a battery cell module provided by an embodiment of the present invention.
  • FIG. 2A is an enlarged view of a partial structure of a battery cell module provided by an embodiment of the present invention.
  • FIG. 2B is a top view of adjacent tabs used in a modified embodiment of the embodiment of the present invention.
  • 2C is an enlarged view of a partial structure of a battery cell module provided by a modified embodiment of the embodiment of the present invention.
  • 3A is a structural diagram of a battery cell module provided by another modified embodiment of the embodiment of the present invention.
  • Fig. 3B is an enlarged view of a partial structure of the battery cell module in Fig. 3A;
  • Fig. 3C is an enlarged view of another partial structure of the battery cell module in Fig. 3A;
  • FIG. 3D is a structural diagram of a battery cell module provided by another modified embodiment of the embodiment of the present invention.
  • 3E is a structural diagram of a battery cell module provided by still another modified embodiment of the embodiment of the present invention.
  • FIG. 4 is an exploded view of a structure of the laser welding tool provided by an embodiment of the present invention.
  • Fig. 5A is a structural diagram of the laser welding tool in Fig. 4 in the first state
  • Fig. 5B is a structural diagram of the laser welding tool in Fig. 4 in the second state
  • Figure 6 is a structural diagram of a positioning structure used in an embodiment of the present invention.
  • Figure 7 is an exploded view of another structure of the laser welding tool provided by the embodiment of the present invention.
  • Fig. 8A is a structural diagram of the second laser fixture in Fig. 7 in the first state
  • Fig. 8B is a structural diagram of the first laser fixture in Fig. 7 in the first state.
  • an embodiment of the present invention provides a battery cell module 1, which includes at least one battery cell group, and each battery cell group includes a plurality of stacked battery cells, for example, as shown in FIG. 1 ,
  • the multiple cells are stacked in sequence in the X direction, and the cell groups are three groups, and the three cell groups (11, 12, 13) are arranged in sequence along the stacking direction of the multiple cells (ie, the X direction).
  • the first battery cell group 11 includes three battery cells (11a, 11b, 11c); the second battery cell group 12 includes three battery cells (12a, 12b, 12c); the third battery cell group 13 includes Three batteries (13a, 13b, 13c).
  • each cell has two tabs 21, a positive tab and a negative tab, which are located on the same side of the cell, and the tabs 21 of every two adjacent cells are in direct contact. Electrical connection to realize electrical connection of multiple cells.
  • the positive pole tabs of the three cells (11a, 11b, 11c) are contacted in sequence, and the negative pole tabs of the three cells (11a, 11b, 11c) are sequentially contacted, thereby realizing the parallel connection of the three cells (11a, 11b, 11c).
  • the embodiment of the present invention does not limit the number of battery cell groups and the number of battery cells in the same battery cell group.
  • the tabs 21 of every two adjacent battery cells are electrically connected in a direct contact manner, which can not only realize the electrical connection of multiple battery cells, but also ensure that the load is satisfied. Therefore, it is possible to reduce the volume of the battery cell module and simplify the manufacturing process of the module, thereby improving the production efficiency and reducing the manufacturing cost of the battery cell.
  • each tab 21 includes extending from the same side of the cell (for example, toward the cell in FIG. 2A).
  • the first portion 211 extending in the Z direction
  • the angle between the second portion 212 and the first portion 211 is, for example, 90°, which is beneficial to the adjacent
  • the second part 212 of the two tabs 21 is welded.
  • the bending direction of the second part 212 of the positive electrode tab and the negative electrode tab is opposite, for example, the second part 212 of the positive electrode tab faces in FIG. 2A
  • One of the X1 direction and the X2 direction is bent, the second part 212 of the negative electrode tab is bent toward the other of the X1 direction and the X2 direction in FIG. 2A, and in the same battery cell group, the pole
  • the properties are the same, and the bending directions of the second parts 212 of the two adjacent tabs are the same, and overlap each other, so as to realize the parallel connection of two adjacent electric cores.
  • the so-called overlap means that the second parts 212 of two adjacent tabs 21 have overlapping parts in the Z direction.
  • This direct contact method using the overlap of the second part 212 of the tab can not only realize the electrical connection between multiple cells, but also meet the current-carrying requirements, and also provide convenience for subsequent tab welding.
  • the bending directions of the second parts of the two adjacent tabs can also be opposite, or at an angle, and it is not limited to overlapping in the Z direction.
  • It can overlap each other in any direction in the three-dimensional space, and the overlap sequence of the second part of two adjacent tabs can be adjusted arbitrarily, for example, in the Z direction, for the second part of two adjacent tabs Part, any one of the second parts can be located above the other second part.
  • the bending direction of the second part 212 of the positive electrode tab of every two adjacent cells is the same and overlaps each other.
  • the bending direction of the second part 212 of the negative electrode tab of each cell is the same and overlaps each other.
  • the overlap method is simpler and provides convenience for subsequent tab welding.
  • a suitable tab lap method can be selected according to the electrical connection methods of multiple cells.
  • the positive tabs of a plurality of battery cells in one of the battery cell groups and the other battery cell group are The negative pole tabs of the multiple battery cores are electrically connected to realize the series connection of two adjacent battery core groups.
  • the negative tabs of the three cells (12a, 12b, 12c) (as shown by the minus sign "-" in Figure 2A)
  • the second part 212 is all bent in the X1 direction in FIG. 1
  • the second part 212 of the positive tab (shown by the plus sign "+" in FIG. 2A) is all bent in the X2 direction in FIG.
  • the second parts 212 of the negative electrode tabs of the three batteries (13a, 13b, 13c) are all bent in the X1 direction in FIG. 1, and the second parts 212 of the positive electrode tabs are all facing in FIG.
  • the second part 212 of the positive electrode tabs of the three cells (11a, 11b, 11c) are all bent in the X2 direction in FIG. 1, and the negative electrode tabs
  • the second part 212 of the battery is bent toward the X1 direction in FIG.
  • each adjacent two tabs 21 By using the second part 212 of each adjacent two tabs 21 to be overlapped to realize the electrical connection of each two adjacent tabs 21, it can not only ensure that the current-carrying requirements are met, but also there is no need to use a bus bar.
  • the volume of the battery cell module is reduced, the manufacturing process of the module is simplified, and the production efficiency can be improved, and the manufacturing cost of the battery cell can be reduced.
  • the size and shape of the second part 212 of the tab 21, as well as the contact area between the two second parts 212 that overlap each other, can be freely set according to the actual requirements of current-carrying. .
  • the tabs 21 of every two adjacent cells are connected by laser welding.
  • the laser can easily weld through the lugs 21 so as to be able to weld the lugs 21 of every two adjacent battery cells together.
  • foam is arranged between every two adjacent battery cells.
  • Foam serves as a buffer between two adjacent cells to avoid collision and friction damage between two adjacent cells.
  • foam is used to fill in The difference in thickness plays a positive role in controlling the flatness of the cell module; at the same time, the foam is used to absorb the thermal expansion between the cells, effectively reducing the risk of thermal runaway of the cell module.
  • the tabs of two adjacent cells are The second part is partially staggered.
  • the second part (212a', 212b', 212c') of the tabs of the three battery cells stacked in sequence is staggered in the Y direction relative to the second part 212a' on the rightmost side.
  • the leftmost second part 212c' is partially offset in the Y direction relative to the middle second part 212b', and the three second parts (212a', 212b', 212c') overlap in sequence. This can also realize the electrical connection of multiple cells.
  • the battery cell module includes three battery cell groups (11', 12', 13'), which are arranged in sequence along the stacking direction of the plurality of battery cells, wherein ,
  • the first battery cell group 11' includes three battery cells (11a', 11b', 11c');
  • the second battery cell group 12' includes three battery cells (12a', 12b', 12c');
  • the three battery cell group 13 includes two battery cells (13a', 13b').
  • each cell has two tabs, a positive tab and a negative tab, which are located on the same side of the cell, and the tabs of every two adjacent cells are electrically connected by direct contact. , In order to realize the electrical connection of multiple cells.
  • the battery cell 11a' has a positive pole tab 2121a and a negative pole tab 2122a; the cell 11b' has a positive pole tab 2121b and a negative pole tab 2122b; the cell 11c' has a positive pole tab 2121c and negative electrode tab 2122c, wherein the bending direction of the negative electrode tab 2122a of the cell 11a' and the positive electrode tab 2121b of the adjacent cell 11b' are opposite, and the second part overlaps each other; the same, the cell The bending directions of the negative electrode tab 2122b of 11b' and the positive electrode tab 2121c of the adjacent cell 11c' are opposite, and the second part overlaps each other, so that multiple cells in the same cell group are connected in series.
  • the bending direction of the negative electrode tab 2122c of the battery cell 11c' in the first battery cell group 11' and the positive electrode tab 2121d of the battery cell 11a' in the second battery cell group 12' are opposite, and the second The parts are overlapped with each other, and so on, so that different battery core groups can be connected in series.
  • the embodiment of the present invention does not limit the extension direction of the first part 211 of the tab 21, and the manner in which two adjacent tabs 21 are directly contacted is not limited to the overlap method adopted in this embodiment. .
  • FIGS. 3A to 3C provide a battery cell module 9 including a plurality of battery cell units electrically connected in sequence in the X direction, each Each cell unit includes a plurality of battery cell groups 91 sequentially stacked in the Z direction, and each battery cell group 91 includes a plurality of battery cells sequentially stacked in the Z direction.
  • FIG. 3A shows three cell units (I, II, III) electrically connected in sequence in the X direction
  • FIG. 3B and FIG. 3C show that each cell unit includes three cells stacked in sequence in the Z direction.
  • each group of cell group 91 includes three cells stacked sequentially in the Z direction, for example, for cell unit I, each group of cell group 91 included includes three cells 91a For the cell unit II, each cell group 91 contained therein includes three cells 91b; for the cell unit III, each cell group 91 contained therein includes three cells 91c.
  • each cell (for example, cell 91a) has two tabs, namely a negative tab and a positive tab, which are located on opposite sides of the cell.
  • the tabs of every two adjacent battery cells are electrically connected by direct contact.
  • the tabs of every two adjacent battery cores can be in the same battery cell group, or in the adjacent battery cell group.
  • Between two groups of battery cells, or between two adjacent battery cell units, in order to realize the electrical connection of multiple cells in the same battery cell group, and the electrical properties between different battery cell groups Connection and electrical connection between different battery cells.
  • the above-mentioned electrical connection may be parallel, series or hybrid.
  • the structure of the two tabs of each cell is different, namely the bent tab 911 and the non-bend tab 911. ';
  • the structure of the two tabs of each cell 91b is the same, and both are non-bending tabs 911'.
  • the structure of the bent tab 911 is the same as the structure of the tab 21 shown in FIG. 1, that is, the bent tab 911 includes the first extending from the battery core (for example, extending in the Z direction in FIG. 2A).
  • the non-bending tab 911' includes a first part extending from the battery core, that is, a straight tab.
  • the bending tab 911 of the two adjacent battery cells adopts a direct contact method with that of the adjacent battery cell in FIG. 2A.
  • the method of direct contact used by the two tabs is similar.
  • the polarity is the same, and the bending directions of the two adjacent bending tabs 911 are the same, and they overlap each other. Pick up.
  • two adjacent bent tabs 911 have overlapping parts in the X direction.
  • the bending directions of the two adjacent bending tabs 911 can also be opposite, or at an angle, and it is not limited to overlapping in the X direction.
  • the polarities of the same side tabs of two adjacent battery cells are the same, so as to realize that the same battery cell group 91 has the same polarity.
  • the parallel connection of two adjacent cells is not limited to this. In practical applications, two adjacent cells in the same cell group 91 can also be connected in series or in series.
  • the bent tabs 911 of the cells in the different cell groups 91 are all located on the same side of the cell, and each In the two adjacent battery cell groups 91, the bent tabs 911 of the multiple cells in one of the cell groups 91 and the bent tabs 911 of the multiple cells in the other group of cell groups
  • the electrical properties are opposite and overlap each other to realize the series connection of two adjacent battery core groups.
  • the bent tabs 911 of the plurality of cells in the uppermost and lowermost cell groups 91 are all negative tabs (the minus sign in FIG.
  • the bent tabs 911 of the multiple cells in the cell group 91 in the middle layer are all positive tabs (as shown by the plus sign “+” in FIG. 3B), and the top and middle layers are The bent tabs 911 in the battery cell group 91 are sequentially overlapped to realize the series connection of the battery cell group 91 of the uppermost layer and the middle layer.
  • the bent tabs 911 of the cells in different battery cell groups 91 may also be located on different sides of the cells.
  • two adjacent battery cell groups can also be connected in parallel or in series.
  • the non-bending tabs 911' of each cell 91a in each cell group 91 are all overlapped with the non-bending tabs 911' on the same side of each cell 91b in each cell group 91 in the cell unit II in a one-to-one correspondence, so as to realize the electrical connection between the cell units.
  • the non-bending tabs 911' of each cell 91a in the top cell group 91 are all positive tabs, and the cells in the middle layer
  • the non-bending tabs 911' of each cell 91a in the group 91 are all negative tabs, and the non-bending tabs 911' of each cell 91a in the lowest cell group 91 are all positive tabs.
  • the non-bending tabs 911' of each cell 91c in the uppermost cell group 91 are all negative tabs, and the non-bending tabs of each cell 91c in the middle layer cell group 91 are non-bending.
  • the tabs 911' are all positive tabs, and the non-bending tabs 911' of each cell 91c in the lowermost cell group 91 are all negative tabs.
  • the non-bending tabs 911' of each cell 91b in the uppermost cell group 91 are all negative tabs, and the non-bending tabs 911 of each cell 91b in the middle layer of the cell group 91 are non-bending.
  • the tabs 911' are all positive tabs, and the non-bending tabs 911' of each cell 91b in the lowermost cell group 91 are all negative tabs.
  • each non-bending tab 911' in the cell unit I and each non-bending tab 911' on the same side in the cell unit II have opposite polarities and are electrically connected; similarly, in the cell unit III
  • Each non-bending tab 911' of the cell unit II has the opposite polarity to each non-bending tab 911' on the same side of the cell unit II, and is electrically connected, thereby realizing the series connection between two adjacent cell units.
  • two adjacent cell units can also be connected in parallel or in series.
  • the structure of the two tabs of each cell is different, namely the bent tab 911 and the non-bended tab 911. ';
  • the structure of the two tabs of each cell 91b is the same, and both are non-bending tabs 911'.
  • the embodiment of the present invention is not limited to this.
  • the two tabs of each cell may also be bent tabs. 911, this can also use the overlap of two adjacent bent tabs 911 or other contact methods to achieve electrical connection between two adjacent battery cell units.
  • FIG. 3D provides a battery cell module 9'.
  • the battery cell unit includes a plurality of battery cell groups 91 ′ sequentially stacked in the Z direction, and each battery cell group 91 ′ includes a plurality of battery cells sequentially stacked in the Z direction.
  • FIG. 3D shows that the battery cell unit includes three battery cell groups 91' sequentially stacked in the Z direction, and each battery cell group 91' includes three battery cells (91a', 91b) sequentially stacked in the Z direction. ',91c').
  • each cell has two tabs, namely a negative tab and a positive tab, which are located on opposite sides of the cell.
  • the tabs of every two adjacent battery cells are electrically connected by direct contact.
  • the tabs of every two adjacent battery cores can be in the same battery cell group, or in the adjacent battery cell group.
  • the above-mentioned electrical connection may be parallel, series or hybrid.
  • the two tabs of each cell are bent tabs 911, and the structure of the bent tabs 911 is the same as that of the tab 21 shown in FIG. 1 That is, the bent tabs 911 all include a first part extending from the same side of the battery cell (for example, extending in the Z direction in FIG. 2A) and a second part bent relative to the first part, the second part and the first part The included angle therebetween is, for example, 90°, which is beneficial for welding the second parts of two adjacent tabs.
  • the bending directions of the two tabs of each battery cell are opposite. Of course, in practical applications, according to different needs, the bending directions of the two tabs of each battery cell can also be the same.
  • the method of direct contact used by the bent tabs 911 of two adjacent battery cells is the same as the method of direct contact used by the two adjacent tabs in FIG. 2A Similarly, specifically, in the same battery cell group 91', the polarities are the same, they are located on the same side, and the bending directions of the two adjacent bending tabs 911 are the same, and they overlap each other.
  • two adjacent bent tabs 911 have overlapping parts in the X direction.
  • the bending directions of the two adjacent bending tabs 911 can also be opposite, or at an angle, and it is not limited to overlap each other in the X direction.
  • the polarities of the same side tabs of two adjacent battery cells are the same, so as to realize that the two adjacent ones in the same battery cell group 91' Parallel connection of batteries.
  • the embodiment of the present invention is not limited to this. In practical applications, two adjacent cells in the same cell group 91' can also be connected in series or in series.
  • the bent tabs 911 of the plurality of cells in one group of cell groups 91' are located on the same side.
  • the electric properties of the bent tabs 911 of the multiple cells in the other battery cell group 91' are opposite, and they overlap each other to realize the series connection of two adjacent battery cell groups.
  • the bent tabs 911 on the left side of the plurality of cells in the uppermost and lowermost cell groups 91' are all positive tabs (as shown in FIG. 3D).
  • the bent tab 911 on the right side are all negative tabs (as shown by the plus sign "+” in Figure 3D); multiple cells in the cell group 91' in the middle layer
  • the bent tabs 911 on the left side of the core are all negative tabs
  • the bent tabs 911 on the right are all positive tabs.
  • the adjacent negative electrode tabs on the left and the positive electrode tabs overlap each other, and between the cell groups 91' of the uppermost layer and the middle layer, they are located on the right.
  • the adjacent negative electrode tabs and the positive electrode tabs on the side overlap each other, thereby realizing that the three battery cell groups 91' are connected in series.
  • each adjacent two groups of battery cell groups 91' it is also possible to make the bent poles of multiple batteries in one of the battery cell groups 91'
  • the lugs 911 have the same electrical properties as the bent lugs 911 of the multiple cells in the other battery cell group 91' on the same side, and overlap each other to realize the parallel connection of two adjacent battery cell groups.
  • two adjacent battery cell groups can also be connected in series.
  • FIG. 3E This modified embodiment provides a battery cell module 9".
  • the difference lies only in: The polarities and overlapping manners of the two adjacent tabs are different.
  • the battery cell module 9" provided by this modified embodiment has only one battery cell unit, and the battery cell unit includes a plurality of groups stacked sequentially in the Z direction
  • the battery cell group 91", each battery cell group 91" includes a plurality of battery cells sequentially stacked in the Z direction.
  • FIG. 3E shows that the battery cell unit includes three battery cell groups 91" stacked sequentially in the Z direction, and each battery cell group 91" includes three battery cells (91a", 91b stacked sequentially in the Z direction. ”,91c”).
  • each cell has two tabs, namely a negative tab and a positive tab, which are located on opposite sides of the cell.
  • the tabs of every two adjacent battery cells are electrically connected by direct contact.
  • the tabs of every two adjacent battery cores can be in the same battery cell group, or in the adjacent battery cell group.
  • the above-mentioned electrical connection may be parallel, series or hybrid.
  • the two tabs of each cell are bent tabs 911, and the structure of the bent tabs 911 is the same as the structure of the tabs shown in FIG. 2C. That is, the bent tabs 911 all include a first part extending from the same side of the battery cell (for example, extending in the Z direction in FIG. 2A) and a second part bent relative to the first part. The second part is different from the first part. The included angle is, for example, 90°, which is beneficial for welding the second parts of two adjacent tabs.
  • the bending directions of the two tabs of each battery cell are opposite. Of course, in practical applications, according to different needs, the bending directions of the two tabs of each battery cell can also be the same.
  • the direct contact mode adopted by the bent tabs 911 of two adjacent battery cells is the same as the direct contact mode adopted by the two adjacent tabs in FIG. 2C Similarly, specifically, in the same battery cell group 91", the polarities are opposite, on the same side, and the bending directions of the two adjacent bending tabs 911 are opposite, and they overlap each other.
  • the bending directions of the two adjacent bent tabs 911 can also be opposite, or at an angle, and also It is not limited to overlap each other in the X direction.
  • any one of the bent tabs 911 may be located on the left side of the other bent tab 911.
  • an embodiment of the present invention also provides a battery cell assembly, which includes the above-mentioned battery cell module provided by the embodiment of the present invention.
  • the embodiment of the present invention also provides a battery cell assembly.
  • a battery cell assembly By adopting the above-mentioned battery cell module provided by the embodiment of the present invention, not only the electrical connection of multiple battery cells can be realized, but also the current-carrying requirements can be met. Without using a bus bar, the volume of the battery cell module can be reduced, the manufacturing process of the module can be simplified, and the production efficiency can be improved, and the manufacturing cost of the battery core can be reduced.
  • the battery cell module there are multiple battery cell modules, which are stacked in sequence, and a fireproof sheet is arranged between two adjacent battery cell modules.
  • the battery cell module may have a fire.
  • the fireproof sheet plays a positive role in preventing the fire from spreading.
  • an embodiment of the present invention also provides a connection method of a battery cell module, which adopts the above-mentioned battery cell module provided in the embodiment of the present invention, and the connection method includes:
  • the tabs of every two adjacent electric cores are electrically connected in a direct contact manner to realize the electrical connection of multiple electric cores.
  • connection method of the battery cell module provided by the embodiment of the present invention, by electrically connecting the tabs of every two adjacent battery cells in direct contact, not only can realize the electrical connection of multiple battery cells, but also ensure that the load is satisfied. Therefore, it is possible to reduce the volume of the battery cell module and simplify the manufacturing process of the module, thereby improving the production efficiency and reducing the manufacturing cost of the battery cell.
  • laser welding is used to electrically connect the tabs of each two adjacent battery cells.
  • the way of laser welding can make the connection of the tabs of every two adjacent battery cores more tight, so that the service life of the battery core module can be improved.
  • each tab 21 includes a first part 211 extending from the same side of the cell (for example, extending in the Z direction in FIG. 2A) and a first part 211 relative to the first part. 211 The second part 212 bent.
  • using laser welding to electrically connect the tabs of each two adjacent cells includes the following steps:
  • the above-mentioned laser welding tool includes a laser jig assembly, which is located on the side of the second part 212 of the tab near the battery core, and is used to support the second part 212 and protect the second part 212 and the second part 212.
  • the laser energy can be controlled within a safe range when the second part 212 of the overlapped tab 21 is penetrated by the laser, so as to ensure that the second part 212 will not be penetrated by the laser. Deformation occurs due to the excessively high temperature, and at the same time, the first part 211 located below the second part 212 and the battery core are protected from being irradiated by the laser.
  • each tab 21 includes a first part 211 protruding from the same side of the battery core and a second part 212 bent relative to the first part 211; wherein, every two adjacent ones The bending direction of the second part 212 of the tab 21 of the battery cell is the same and overlaps each other.
  • the laser welding tool includes a laser jig assembly, the laser jig assembly is used to be located on the side of the second part of the tab near the battery core during laser welding to support the second part and protect the second part and The component located on its side close to the battery cell.
  • the laser welding tool provided by the embodiment of the present invention by electrically connecting the tabs of every two adjacent cells in direct contact, can not only realize the electrical connection of multiple cells, but also ensure that the current-carrying requirements are met, Moreover, the bus bar can be eliminated, so that the volume of the battery cell module can be reduced, the manufacturing process of the module can be simplified, and the production efficiency can be improved, and the manufacturing cost of the battery core can be reduced.
  • the laser fixture assembly 3 can have various structures.
  • the laser fixture assembly 3 includes a first laser fixture 31 and a second laser fixture 32, and a first laser fixture 31 and a second laser fixture.
  • the jigs 32 are all located on the side of the second part 212 close to the cell during laser welding, and the second laser jig 32 is located on the side of the first laser jig 31 away from the cell (ie, in FIG. 4,
  • the second laser fixture 32 is located above the first laser fixture 31), and both the first laser fixture 31 and the second laser fixture 32 are provided with a slot 33 through which the first part of the electrode passes. 33 can also play a role in limiting the position of the tab to ensure welding accuracy.
  • the first laser fixture 31 is used to absorb laser energy, so that the laser energy can be controlled within a safe range through heat dissipation, so as to ensure that the second part 212 will not be deformed due to excessive temperature after being penetrated by the laser;
  • the second laser jig 32 is used to support the second part 212 and is made of a material that transmits laser light so that the laser can pass through the second laser jig 32 and irradiate the first laser jig 31.
  • the second laser jig 32 is also used to isolate the second part 212 of the tab and the first laser jig 31 to prevent the two from being welded together.
  • the material used for the second laser jig 32 includes high borosilicate glass.
  • the high borosilicate glass has a higher melting temperature than ordinary silicate glass, which can prevent the second laser jig 32 from being too high due to welding temperature. However, it is damaged and has high light transmission performance, which can effectively transmit laser light.
  • the material used for the first laser fixture 31 includes materials with good thermal conductivity, such as stainless steel or graphite, so as to prevent the cell module 1 from being deformed due to the heat generated by welding.
  • materials with good thermal conductivity such as stainless steel or graphite
  • stainless steel With high strength and low cost, the first laser jig 31 is strong and durable while reducing the cost.
  • the first laser fixture 31 includes a first sub fixture 311 and a second sub fixture 312, and the second laser fixture 32 includes a third sub fixture 321 and a fourth sub fixture 322.
  • the third sub-fixture 321 and the fourth sub-fixture 322 are respectively arranged corresponding to the first sub-fixture 311 and the second sub-fixture 312, that is, the third sub-fixture 321 is correspondingly located above the first sub-fixture 311 , The fourth sub-fixture 322 is correspondingly located above the second sub-fixture 312.
  • the socket 33 includes a first sub-slot 331 respectively arranged on the first sub-fixture 311 and the second sub-fixture 312, and respectively arranged on the third sub-fixture 321 and the fourth sub-fixture 322 The second sub-slot 332. Both the first sub-slot 331 and the second sub-slot 332 have openings in the Y direction in FIG. 4 for the first part of the tab to move in or out.
  • the laser welding tooling further includes a first auxiliary component and a second auxiliary component, both of which use a moving structure 6 as shown in FIG. 4, and the moving structure 6 may have a variety of structures, for example, including a moving plate 61 And the moving shaft 62 connected thereto, wherein the moving plate 61 is vertically arranged along the Z direction, and two moving plates 61 are arranged oppositely in the Y direction.
  • the moving shaft 62 By manually or automatically driving the moving shaft 62 to move in the Y direction, the two moving plates 61 can be moved closer to or farther away from each other.
  • the first sub-fixture 311 and the second sub-fixture 312, as well as the third sub-fixture 321 and the fourth sub-fixture 322 are all fixedly connected to the corresponding moving plate 6 by screws.
  • the moving shaft 62 may be connected to a linear drive source, such as a linear hydraulic cylinder, a linear cylinder, or a linear motor.
  • a linear drive source such as a linear hydraulic cylinder, a linear cylinder, or a linear motor.
  • the above-mentioned moving structure 6 of the first auxiliary assembly is used to drive the first sub-fixture 311 and the third sub-fixture 321 which are both located on the left side of FIG. 4 to move synchronously
  • the above-mentioned moving structure 6 of the second auxiliary assembly is used to drive the same
  • the second sub-fixture 312 and the fourth sub-fixture 322 located on the right side of FIG. 4 move synchronously, so that the first sub-fixture 311 and the second sub-fixture 312 are docked or separated from each other, and the third sub-fixture 321 and The fourth sub-fixture 322 is docked or separated from each other.
  • FIG. 5A shows the first state where the first sub-fixture 311 and the second sub-fixture 312 are separated from each other, and the third sub-fixture 321 and the fourth sub-fixture 322 are separated from each other.
  • the battery cell can be modeled.
  • FIG. 5B shows the second state where the first sub-fixture 311 and the second sub-fixture 312 are butted with each other, and the third sub-fixture 321 and the fourth sub-fixture 322 are butted with each other. It can be laser welded.
  • the first part of the corresponding tab moves into or out of the first sub-slot 331; the third sub-fixture 321 and the first sub-slot 331 When the four sub-fixtures 322 are docked or separated from each other, the first part of the corresponding tab moves into or out of the second sub-slot 332.
  • the tabs can be more conveniently and accurately aligned. Perform laser welding.
  • the laser welding tooling further includes a bottom plate 4 on which the battery cell module 1 is disposed, and a guide rail 41 is disposed on the bottom plate 4.
  • the extension direction (ie, the Y direction) of the guide rail 41 is more
  • the stacking directions (ie, the X direction) of the battery cores are perpendicular to each other; the first auxiliary component and the second auxiliary component (for example, the moving plate 61) are both provided with a sliding structure (not shown in the figure) that is slidably engaged with the guide rail,
  • the sliding structure is used to drive the first auxiliary component and the second auxiliary component to slide along the guide rail 41.
  • the sliding structure is, for example, a sliding groove that is slidingly fitted with the guide rail 4.
  • the first auxiliary component and the second auxiliary component can be guided, thereby further improving the welding accuracy, and at the same time, it can be ensured that the first part of the tab can be accurately moved into the corresponding sub-slot in.
  • two clamping plates (51, 52) are also provided on the bottom plate 4 and located between the above-mentioned first auxiliary component and the second auxiliary component (ie, the two moving plates 61), and two clamping plates ( 51, 52) are arranged oppositely in the stacking direction (that is, the X direction) of the plurality of cells, and are used to clamp the cell module 1 between the two.
  • the upper end of the splint 51 is provided with a receiving groove 511, and correspondingly, a receiving groove (not shown in the figure) is also opened on the upper end of the splint 52 to facilitate the electrical connection.
  • the core module 1 is taken out from between the two clamping plates (51, 52).
  • two mating surfaces of the first sub-fixture 311 and the second sub-fixture 312 are respectively provided with a convex portion 311a and a concave portion 312a, which cooperate with each other to The docking position of the first sub-fixture 311 and the second sub-fixture 312 can be defined to ensure welding accuracy.
  • the connection method of the battery cell module includes:
  • Step 1 Place the battery cell module 1 between the two clamping plates (51, 52);
  • Step 2 Control the two moving shafts 62 to respectively push the two moving plates 62 to move toward each other.
  • the two moving plates 62 drive the first sub-fixture 311 and the third sub-fixture 321 and the second sub-fixture respectively.
  • the second sub-fixture 312 and the fourth sub-fixture 322 move synchronously until the first sub-fixture 311 and the second sub-fixture 312 are connected to each other, and the third sub-fixture 321 and the fourth sub-fixture 322 are connected to each other;
  • the first part of the tab 21 enters the corresponding sub-slot.
  • the second part 212 of the tab, the second laser fixture 32 and the first laser fixture 31 are arranged in order from top to bottom.
  • Step 3 Use a laser to weld the overlapping second part 212 of the tab from top to bottom;
  • Step 4 After the laser welding is completed, the two moving shafts 62 are controlled to push the two moving plates 62 to move away from each other. In this process, the two moving plates 62 drive the first sub-fixture 311 and the third sub-fixture respectively.
  • the sub-fixture 321 and the second sub-fixture 312 and the fourth sub-fixture 322 move synchronously until the first sub-fixture 311 and the second sub-fixture 312 are separated from each other, and the third sub-fixture 321 and the fourth sub-fixture 322 are separated from each other; after the separation process is completed, the cell module 1 is taken out through the taking slot 511.
  • the laser fixture assembly 7 includes a first laser fixture 71 and a second laser fixture 72, wherein the first laser fixture 71 is located
  • the second part 212 of the lug has a side close to the battery core, and is provided with a slot 74 for the first portion 212 to pass through.
  • the slot 74 can also function to limit the position of the lug to ensure welding accuracy.
  • the first laser fixture 71 is used to support the second part 212 of the tab, and at the same time can also play a role in dissipating heat to the second part 212 of the tab.
  • the first laser jig 71 is also provided with a laser avoiding groove 75, which is used to prevent the laser from directly irradiating the plane of the first laser jig 71 to produce explosive spots, thereby improving the safety of welding.
  • the depth of the laser avoidance groove 75 is, for example, 2 mm or more.
  • the above-mentioned second laser fixture 72 is located on the side of the second part 212 of the tab that is far away from the battery core, and is used for pressing the second part 212 and at the same time, it can also dissipate heat to the second part 212 of the tab. Moreover, the second laser jig 72 is provided with a through slot 73 for the laser to pass through at a position corresponding to each second part 212.
  • Both the first laser fixture 71 and the second laser fixture 72 can control the laser energy within a safe range through heat dissipation, thereby ensuring that the second part 212 will not be deformed due to excessive temperature after being penetrated by the laser.
  • the first laser fixture 71 includes a first sub fixture 711 and a second sub fixture 712
  • the second laser fixture 72 includes a third sub fixture 721 and a fourth sub fixture 722
  • the second laser fixture 72 includes a third sub fixture 721 and a fourth sub fixture 722.
  • the third sub-fixture 721 and the fourth sub-fixture 722 are respectively arranged corresponding to the first sub-fixture 711 and the second sub-fixture 712, that is, the third sub-fixture 721 is correspondingly located above the first sub-fixture 711, and the third sub-fixture 721 is correspondingly located above the first sub-fixture 711.
  • the four sub-fixture 722 is correspondingly located above the second sub-fixture 712.
  • the aforementioned slot 74 includes sub-slots respectively provided on the first sub-fixture 711 and the second sub-fixture 712.
  • the sub-slot has an opening in the Y direction in FIG. 7 for the first part of the tab to move in or out.
  • the laser welding tooling also includes a first auxiliary component and a second auxiliary component, both of which use a moving structure 6 as shown in FIG. 7, which is the same as the moving structure 6 shown in FIG. 4 above. It has been described in detail in the article, so I won't repeat it here.
  • the first sub-fixture 711 and the second sub-fixture 712, as well as the third sub-fixture 721 and the fourth sub-fixture 722 are all fixedly connected to the corresponding moving plate 6 by screws.
  • the above-mentioned moving structure 6 of the first auxiliary component is used to drive the first sub-fixture 711 and the third sub-fixture 721 which are both located on the left side of FIG. 7 to move synchronously
  • the above-mentioned moving structure 6 of the second auxiliary component is used to drive the same
  • the second sub-fixture 712 and the fourth sub-fixture 722 located on the right side of FIG. 7 move synchronously, so that the first sub-fixture 711 and the second sub-fixture 712 are close to or separated from each other, while the third sub-fixture 721 and The fourth sub-fixture 722 is close to or separated from each other.
  • FIG. 8A shows a state in which the third sub-fixture 721 and the fourth sub-fixture 722 are close to each other
  • FIG. 8B shows a state in which the first sub-fixture 711 and the second sub-fixture 712 are close to each other. Laser welding is possible.
  • the tabs can be more conveniently and accurately aligned. Perform laser welding.
  • the laser fixture assembly 7 further includes a supporting cooling mechanism connected to the first laser fixture 71, and the second laser fixture 72 is connected to the first laser fixture 71; the supporting cooling mechanism is used for It supports and cools the second laser fixture 72 and the first laser fixture 71. With the support of the cooling mechanism, the heat of the second part of the tab can be further reduced, thereby effectively ensuring that the second part 212 will not be deformed due to excessive temperature after being penetrated by the laser.
  • the above-mentioned supporting and cooling mechanism includes a first supporting cooling member 81 and a second supporting cooling member 82, which are connected to two The two moving plates 61 are fixedly connected, and each supporting cooling member is provided with a channel for conveying cooling water for cooling.
  • the technical solutions of the battery cell module and its connection method, the battery cell assembly and the laser welding tooling provided by the embodiments of the present invention are achieved by directly contacting the tabs of every two adjacent battery cells.
  • the connection can not only realize the electrical connection of multiple cells, but also ensure that the current-carrying requirements are met, and bus bars can be eliminated, thereby reducing the volume of the cell module, simplifying the manufacturing process of the module, and improving Production efficiency reduces the production cost of batteries.

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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

一种电芯模组（1）及其连接方法、电芯总成及激光焊接工装，该电芯模组（1）包括至少一组电芯组（11，12，13），每组所述电芯组（11，12，13）包括堆叠的多个电芯（11a，11b，11c，12a，12b，12c，13a，13b，13c），且每相邻两个电芯（11a，11b，11c，12a，12b，12c，13a，13b，13c）的极耳（21）采用直接接触的方式电连接，以实现多个电芯（11a，11b，11c，12a，12b，12c，13a，13b，13c）的电性连接。所述电芯模组（1），不仅可以实现多个电芯（11a，11b，11c，12a，12b，12c，13a，13b，13c）的电性连接，同时保证满足载流的要求，而且可以不使用汇流排，从而可以减小电芯模组（1）的体积，简化模组的制作工艺，进而可以提高生产效率，降低电芯（11a，11b，11c，12a，12b，12c，13a，13b，13c）的制作成本。

Description

电芯模组及其连接方法、电芯总成及激光焊接工装 技术领域
本发明涉及电池以及电池的安装技术领域，具体地涉及一种电芯模组及其连接方法、电芯总成及激光焊接工装。
背景技术
目前，对于软包电池，多个电芯的极耳之间通常使用汇流排电连接，从而实现多个电芯之间的电性连接。但是，为了满足载流的要求，汇流排的尺寸通常较大，这增加了电芯模组的体积，而且由于汇流排的制作工艺复杂，导致生产效率较低，而且增加了电芯的制作成本。
发明内容
本发明的目的是为了克服现有技术存在的因设置汇流排而造成的电芯模组体积较大，生产效率较低，而且电芯的制作成本较高的问题。
为了实现上述目的，本发明第一方面提供一种电芯模组，包括至少一组电芯组，每组所述电芯组包括堆叠的多个电芯，且每相邻两个所述电芯的极耳采用直接接触的方式电连接，以实现多个所述电芯的电性连接。
可选的，每个所述极耳均包括从所述电芯同一侧延伸出的第一部分和相对于所述第一部分弯折的第二部分；其中，每相邻两个所述电芯的极耳的所述第二部分的弯折方向相同，且相互搭接。
可选的，在与多个所述电芯的堆叠方向相互垂直的方向上，相邻两个所述电芯的极耳的所述第二部分部分交错。
可选的，每个所述电芯的极耳为两个，分别为正极极耳和负极极耳，且所述正极极耳和负极极耳的所述第二部分的弯折方向相反，并且每相邻两个 所述电芯的正极极耳的所述第二部分的弯折方向相同，且相互搭接；每相邻两个所述电芯的负极极耳的所述第二部分的弯折方向相同，且相互搭接，以实现多个所述电芯的并联。
可选的，每个所述电芯的极耳为两个，分别为正极极耳和负极极耳，并且
每相邻的两个所述电芯中，其中一个所述电芯的正极极耳的所述第二部分与其中另一个所述电芯的负极极耳的所述第二部分相互搭接，以实现每相邻的两个所述电芯的串联。
可选的，每相邻两个所述电芯的极耳采用激光焊接的方式连接。
可选的，所述电芯组为多组，且多组所述电芯组沿多个所述电芯的堆叠方向设置；并且，每个所述电芯的极耳为两个，分别为正极极耳和负极极耳，对于每组所述电芯组，每相邻的两个所述电芯的正极极耳电连接，每相邻的两个所述电芯的负极极耳电连接，以实现多个所述电芯的并联；或者，每相邻的两个所述电芯中，其中一个所述电芯的正极极耳与其中另一个所述电芯的负极极耳电连接，以实现每相邻的两个所述电芯的串联；
在每相邻的两组所述电芯组中，其中一组所述电芯组中的所述电芯的正极极耳与相邻的其中另一组所述电芯组中的多个所述电芯的负极极耳电连接，以实现相邻的两组所述电芯组的串联；或者，相邻的两组所述电芯组中的所述电芯的正极极耳电连接，相邻的两组所述电芯组中的所述电芯的负极极耳电连接，以实现相邻的两组所述电芯组的并联。
可选的，每个所述电芯的极耳为两个，分别为正极极耳和负极极耳，且分别位于所述电芯的彼此相对的两侧，并且，每个所述电芯的两个极耳均包括从所述电芯延伸出的第一部分和相对于所述第一部分弯折的第二部分；其中，每相邻两个所述电芯的极耳的所述第二部分相互搭接；
或者，每个所述电芯的两个极耳中，第一个极耳包括从所述电芯延伸出 的第一部分和相对于所述第一部分弯折的第二部分，第二个极耳包括从所述电芯延伸出的第一部分；其中，每相邻的两个电芯的所述第一个极耳的所述第二部分相互搭接，或者每相邻的两个电芯的所述第二个极耳的所述第一部分相互搭接。
可选的，所述电芯模组包括至少一个电芯单元，每个所述电芯单元包括多组所述电芯组，每相邻的两组所述电芯组中，相邻的两个所述电芯的极耳电连接；
所述电芯单元为多个时，每相邻的两个所述电芯单元中，其中一个所述电芯单元中的各个所述电芯的同一侧极耳与其中另一个所述电芯单元中的各个所述电芯的同一侧极耳一一对应地电连接，以实现相邻的两个所述电芯单元之间的电性连接。
本发明第二方面提供一种电芯总成，包括本发明实施例提供的上述电芯模组。
可选的，所述电芯模组为多个，且相邻的两个所述电芯模组之间设置有防火片。
本发明第三方面提供一种电芯模组的连接方法，所述电芯模组采用本发明实施例提供的上述电芯模组，所述连接方法包括：
将每相邻的两个电芯的极耳采用直接接触的方式电连接，以实现多个所述电芯的电性连接。
可选的，采用激光焊接的方式将每相邻的两个电芯的极耳电连接。
可选的，每个所述极耳均包括从所述电芯延同一侧伸出的第一部分和相对于所述第一部分弯折的第二部分；其中，每相邻两个所述电芯的极耳的所述第二部分的弯折方向相同，且相互搭接；
所述采用激光焊接的方式将每相邻的两个电芯的极耳电连接，包括以下步骤：
S1、提供一激光焊接工装，所述激光焊接工装包括激光治具组件，所述激光治具组件位于所述第二部分的靠近所述电芯的一侧，用于支撑所述第二部分，并保护所述第二部分以及位于所述第二部分的靠近所述电芯的一侧的部件；
S2、使用激光自所述第二部分的远离所述电芯的一侧焊接每相邻的两个所述极耳的所述第二部分。
本发明第四方面提供一种激光焊接工装，所述激光焊接工装用于辅助采用激光焊接的方式将每相邻的两个电芯的极耳电连接，每个所述极耳均包括从所述电芯延同一侧伸出的第一部分和相对于所述第一部分弯折的第二部分；其中，每相邻两个所述电芯的极耳的所述第二部分的弯折方向相同，且相互搭接；
所述激光焊接工装包括激光治具组件，所述激光治具组件用于在激光焊接时位于所述第二部分的靠近所述电芯的一侧，以支撑所述第二部分，并保护所述第二部分以及位于所述第二部分的靠近所述电芯的一侧的部件。
可选的，所述激光治具组件包括第一激光治具和第二激光治具，所述第一激光治具和第二激光治具在激光焊接时均位于所述第二部分的靠近所述电芯的一侧，且所述第二激光治具位于所述第一激光治具的远离所述电芯的一侧，并且所述第一激光治具和第二激光治具中均设置有供所述第一部分穿过的插槽；其中，
所述第一激光治具用于吸收激光能量；
所述第二激光治具用于支撑所述第二部分，且采用透射激光的材质制作。
可选的，所述第一激光治具包括第一子治具和第二子治具，所述第二激光治具包括第三子治具和第四子治具，且分别与所述第一子治具和第二子治具对应设置；
所述插槽包括分别设置在所述第一子治具和第二子治具上的第一子插槽，以及分别设置在所述第三子治具和第四子治具上的第二子插槽；
所述激光焊接工装还包括第一辅助组件和第二辅助组件，其中，所述第一辅助组件用于带动所述第一子治具与所述第三子治具同步移动，所述第二辅助组件用于带动所述第二子治具与所述第四子治具同步移动，以使所述第一子治具与所述第二子治具相互对接或者分离，同时所述第三子治具与所述第四子治具相互对接或者分离；并且，所述第一子治具和第二子治具在相互对接或者分离的过程中，相应的所述第一部分移入或移出所述第一子插槽；所述第三子治具和第四子治具在相互对接或者分离的过程中，相应的所述第一部分移入或移出所述第二子插槽。
可选的，所述激光治具组件包括第一激光治具和第二激光治具，其中，
所述第一激光治具位于所述第二部分的靠近所述电芯的一侧，且设置有供所述第一部分穿过的插槽，所述第一激光治具用于支撑所述第二部分，并且在所述第一激光治具上还设置有激光避让槽；
所述第二激光治具位于所述第二部分的远离所述电芯的一侧，用于压住所述第二部分，且在所述第二激光治具上对应各个所述第二部分的位置处设置有供激光穿过的通槽。
可选的，所述第一激光治具包括第一子治具和第二子治具，所述第二激光治具包括第三子治具和第四子治具，且分别与所述第一子治具和第二子治具对应设置；
所述插槽包括分别设置在所述第一子治具和第二子治具上的子插槽；
所述激光焊接工装还包括第一辅助组件和第二辅助组件，其中，所述第一辅助组件用于带动所述第一子治具与所述第三子治具同步移动，所述第二辅助组件用于带动所述第二子治具与所述第四子治具同步移动，以使所述第一子治具与所述第二子治具相互靠近或者分离，同时所述第三子治具与所述 第四子治具相互靠近或者分离；并且，所述第一子治具和第二子治具在相互靠近或者分离的过程中，相应的所述第一部分移入或移出所述子插槽。
可选的，所述激光焊接工装还包括底板，所述电芯模组设置在所述底板上，且在所述底板上设置有导轨，所述导轨的延伸方向与所述多个电芯的堆叠方向相互垂直；所述第一辅助组件和第二辅助组件上均设置有与所述导轨滑动配合的滑动结构，所述滑动结构用于带动所述第一辅助组件和第二辅助组件沿所述导轨滑动。
可选的，在所述底板上，且位于所述第一辅助组件和第二辅助组件之间还设置有两个夹板，所述两个夹板在所述多个电芯的堆叠方向上相对设置，用于将所述电芯模组夹持在二者之间。
可选的，所述激光治具组件还包括支撑冷却机构，所述支撑冷却机构与所述第一激光治具连接，所述第二激光治具与所述第一激光治具连接；所述支撑冷却机构用于支撑所述第二激光治具与所述第一激光治具，并对二者进行冷却。
本发明实施例提供的电芯模组及其连接方法、电芯总成及激光焊接工装的技术方案，通过将每相邻两个电芯的极耳采用直接接触的方式电连接，不仅可以实现多个电芯的电性连接，同时保证满足载流的要求，而且可以不使用汇流排，从而可以减小电芯模组的体积，简化模组的制作工艺，进而可以提高生产效率，降低电芯的制作成本。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例提供的电芯模组的结构图；
图2A是本发明实施例提供的电芯模组的局部结构放大图；
图2B是本发明实施例的一个变型实施例采用的相邻极耳的俯视图；
图2C是本发明实施例的一个变型实施例提供的电芯模组的局部结构放大图；
图3A是本发明实施例的另一个变型实施例提供的电芯模组的结构图；
图3B是图3A中电芯模组的一种局部结构放大图；
图3C是图3A中电芯模组的另一种局部结构放大图；
图3D是本发明实施例的又一个变型实施例提供的电芯模组的结构图；
图3E是本发明实施例的再一个变型实施例提供的电芯模组的结构图；
图4是本发明实施例提供的激光焊接工装的一种结构分解图；
图5A是图4中的激光焊接工装在第一种状态时的结构图；
图5B是图4中的激光焊接工装在第二种状态时的结构图；
图6是本发明实施例采用的定位结构的结构图；
图7是本发明实施例提供的激光焊接工装的另一种结构分解图；
图8A是图7中的第二激光治具在第一种状态时的结构图；
图8B是图7中的第一激光治具在第一种状态时的结构图。
具体实施方式
以下结合附图对本发明的具体实施方式进行详细说明。应当理解的是，此处所描述的具体实施方式仅用于说明和解释本发明，并不用于限制本发明。
请参阅图1和图2A，本发明实施例提供一种电芯模组1，其包括至少一组电芯组，每组电芯组包括堆叠的多个电芯，例如，如图1所示，多个电芯在X方向上依次堆叠，并且电芯组为三组，三组电芯组(11，12，13)沿多个电芯的堆叠方向(即，X方向)依次设置，相邻的两组电芯组之间可以有 间隔，或者也可以相互堆叠，或者还可以设置泡棉等缓冲隔离材料。
其中，第一组电芯组11包括三个电芯(11a，11b，11c)；第二组电芯组12包括三个电芯(12a，12b，12c)；第三组电芯组13包括三个电芯(13a，13b，13c)。并且，每个电芯均具有两个极耳21，分别为正极极耳和负极极耳，二者位于电芯的同一侧，且每相邻两个电芯的极耳21采用直接接触的方式电连接，以实现多个电芯的电性连接。以第一组电芯组11为例，三个电芯(11a，11b，11c)的正极极耳依次接触，负极极耳依次接触，从而实现三个电芯(11a，11b，11c)并联。
需要说明的是，同一组电芯组中的多个电芯之间的电性连接方式可以有多种，而并不局限于本实施例采用的并联方式，还可以是串联或者混联。例如，对于同一组电芯组，每相邻的两个电芯中，其中一个电芯的正极极耳与其中另一个电芯的负极极耳直接接触，以实现每相邻的两个电芯的串联。不同的电芯组之间的电性连接方式也可以有多种，而并不局限于本实施例采用的串联，也可以是并联或者混联。例如，在每相邻的两组电芯组中，相邻的两组电芯组中的电芯的正极极耳电连接，相邻的两组电芯组中的电芯的负极极耳电连接，以实现相邻的两组电芯组的并联。
还需要说明的是，本发明实施例对电芯组的组数以及同一组电芯组中的电芯数量不作限定。
本发明实施例提供的电芯模组1，其通过将每相邻两个电芯的极耳21采用直接接触的方式电连接，不仅可以实现多个电芯的电性连接，同时保证满足载流的要求，而且可以不使用汇流排，从而可以减小电芯模组的体积，简化模组的制作工艺，进而可以提高生产效率，降低电芯的制作成本。
在一些实施例中，相邻的两个极耳21直接接触的方式有多种，例如，如图1所示，每个极耳21均包括从电芯同一侧延伸(例如朝图2A中的Z方向延伸)出的第一部分211和相对于该第一部分211弯折的第二部分212， 第二部分212与第一部分211之间的夹角例如为90°，该角度有利于对相邻的两个极耳21的第二部分212进行焊接。
在一些实施例中，如图2A所示，对于每个电芯，正极极耳和负极极耳的第二部分212的弯折方向相反，例如，正极极耳的第二部分212朝图2A中的X1方向和X2方向中的其中一者弯折，负极极耳的第二部分212朝图2A中的X1方向和X2方向中的其中另一者弯折，并且同一组电芯组中，极性相同，且相邻的两个极耳的第二部分212的弯折方向相同，并相互搭接，以实现相邻的两个电芯的并联。所谓搭接，是指相邻的两个极耳21的第二部分212在Z方向上存在相互重叠的部分。这种利用极耳的第二部分212搭接的直接接触方式不仅可以实现多个电芯之间的电性连接，而且可以满足载流的要求，还为后续的极耳焊接提供方便。当然，在实际应用中，相邻的两个极耳的第二部分的弯折方向也可以相反，或者呈夹角，而且也并不局限于在Z方向上相互搭接，在实际应用中，可以在三维空间中的任意方向上相互搭接，而且相邻的两个极耳的第二部分的搭接顺序可以任意调整，例如，在Z方向上，对于相邻两个极耳的第二部分，其中任意一个第二部分可以位于另一个第二部分的上方。
在一些实施例中，如图2A所示，对于同一组电芯组，每相邻两个电芯的正极极耳的第二部分212的弯折方向相同，且相互搭接，每相邻两个电芯的负极极耳的第二部分212的弯折方向相同，且相互搭接，这样，不仅可以实现相邻两个电芯的并联，而且在三个以上的电芯并联时，通过使正极极耳的第二部分的弯折方向相同，负极极耳的第二部分的弯折方向相同，可以使三个以上的正极极耳依次搭接，三个以上的负极极耳依次搭接，搭接方式更简单，而且为后续的极耳焊接提供方便。当然，在实际应用中，可以根据多个电芯的电性连接方式选择合适的极耳搭接方式。
在一些实施例中，对于不同的电芯组，在每相邻的两组电芯组中，其中 一组电芯组中的多个电芯的正极极耳与其中另一组电芯组中的多个电芯的负极极耳电连接，以实现相邻的两组电芯组的串联。例如，如图1和图2A所示，第二组电芯组12中，三个电芯(12a，12b，12c)的负极极耳(如图2A中的减号“-”所示)的第二部分212均朝图1中的X1方向弯折，正极极耳(如图2A中的加号“+”所示)的第二部分212均朝图1中的X2方向弯折；第三组电芯组13中，三个电芯(13a，13b，13c)的负极极耳的第二部分212均朝图1中的X1方向弯折，正极极耳的第二部分212均朝图1中的X2方向弯折；第一组电芯组11中，三个电芯(11a，11b，11c)的正极极耳的第二部分212均朝图1中的X2方向弯折，负极极耳的第二部分212均朝图1中的X1方向弯折，其中，第一组电芯组11中的电芯11a的负极极耳的第二部分212与相邻的第二组电芯组12中的电芯12a的正极极耳的第二部分212搭接，第二组电芯组12中的电芯12c的负极极耳的第二部分212与相邻的第三组电芯组13中的电芯13c的正极极耳的第二部分212搭接，从而实现三组电芯组的串联。
通过利用每相邻的两个极耳21的第二部分212搭接来实现每相邻的两个极耳21的电连接，不仅可以保证满足载流的要求，而且无需使用汇流排，从而可以减小电芯模组的体积，简化模组的制作工艺，进而可以提高生产效率，降低电芯的制作成本。
需要说明的是，在实际应用中，可以根据载流的实际要求，自由设定极耳21的第二部分212的尺寸和形状，以及相互搭接的两个第二部分212之间的接触面积。
在一些实施例中，可选的，每相邻两个电芯的极耳21采用激光焊接的方式连接。激光可以轻易焊透极耳21，以能够实现将每相邻两个电芯的极耳21焊接在一起。
在一些实施例中，可选的，每相邻的两个电芯之间设置有泡棉。泡棉在 相邻的两个电芯之间起到了缓冲作用，避免相邻的两个电芯之间的撞击摩擦损坏，同时因为各个电芯之间在厚度上存在差异，泡棉用于填补厚度差异，对于控制电芯模组的平整度起到了积极作用；同时泡棉用于吸收各个电芯之间的热膨胀，有效降低电芯模组热失控风险。
作为本实施例的一个变型实施例，如图2B所示，在与多个电芯的堆叠方向相互垂直的方向(即，图3中的Y方向)上，相邻两个电芯的极耳的第二部分部分交错。以依次堆叠的三个电芯的极耳的第二部分(212a’，212b’，212c’)为例，中间的第二部分212b’相对于最右侧的第二部分212a’朝Y方向错开一部分，最左侧的第二部分212c’相对于中间的第二部分212b’朝Y方向错开一部分，并且三个第二部分(212a’，212b’，212c’)依次搭接。这同样可以实现多个电芯的电性连接。
作为本实施例的一个变型实施例，如图2C所示，电芯模组包括三组电芯组(11’，12’，13’)，且沿多个电芯的堆叠方向依次设置，其中，第一组电芯组11’包括三个电芯(11a’，11b’，11c’)；第二组电芯组12’包括三个电芯(12a’，12b’，12c’)；第三组电芯组13包括两个电芯(13a’，13b’)。并且，每个电芯均具有两个极耳，分别为正极极耳和负极极耳，二者位于电芯的同一侧，且每相邻两个电芯的极耳采用直接接触的方式电连接，以实现多个电芯的电性连接。
例如，第一组电芯组11’中，电芯11a’具有正极极耳2121a和负极极耳2122a；电芯11b’具有正极极耳2121b和负极极耳2122b；电芯11c’具有正极极耳2121c和负极极耳2122c，其中，电芯11a’的负极极耳2122a与相邻的电芯11b’的正极极耳2121b的弯折方向相反，且第二部分相互搭接；同样的，电芯11b’的负极极耳2122b与相邻的电芯11c’的正极极耳2121c的弯折方向相反，且第二部分相互搭接，从而实现同一组电芯组中多个电芯依次串联。并且，第一组电芯组11’中的电芯11c’的负极极耳2122c与第 二组电芯组12’中的电芯11a’的正极极耳2121d的弯折方向相反，且第二部分相互搭接，依次类推，可以实现不同电芯组之间依次串联。
需要说明的是，同一组电芯组中的多个电芯之间的电性连接方式可以有多种，而并不局限于本变型实施例采用的串联方式，还可以是并联或者混联。不同的电芯组之间的电性连接方式也可以有多种，而并不局限于本变型实施例采用的串联，也可以是并联或者混联。
还需要说明的是，本发明实施例对极耳21的第一部分211的延伸方向不作限定，以及对相邻两个极耳21直接接触的方式也并不局限于本实施例采用的搭接方式。
作为本实施例的一个变型实施例，请一并参阅图3A至图3C，本变型实施例提供一种电芯模组9，其包括在X方向上依次电连接的多个电芯单元，每个电芯单元包括在Z方向上依次堆叠的多组电芯组91，每组电芯组91包括在Z方向上依次堆叠的多个电芯。例如，图3A示出了在X方向上依次电连接的三个电芯单元(I,II,III)，图3B和图3C示出了每个电芯单元包括在Z方向上依次堆叠的三组电芯组91，每组电芯组91包括在Z方向上依次堆叠的三个电芯，例如，对于电芯单元I，其所包含的每组电芯组91均包括三个电芯91a；对于电芯单元II，其所包含的每组电芯组91均包括三个电芯91b；对于电芯单元III，其所包含的每组电芯组91均包括三个电芯91c。
而且，每个电芯(例如电芯91a)均具有两个极耳，分别为负极极耳和正极极耳，二者分别位于电芯的彼此相对的两侧。每相邻的两个电芯的极耳采用直接接触的方式电连接，这里，“每相邻的两个电芯的极耳”可以是在同一组电芯组中，或者是在相邻的两组电芯组之间，或者是在相邻的两个电芯单元之间，以实现同一组电芯组中的多个电芯的电性连接，不同的电芯组之间的电性连接以及不同的电芯单元之间的电性连接。上述电性连接可以是并联、串联或者混联。
在一些实施例中，如图3B所示，对于电芯单元I和电芯单元III，每个电芯的两个极耳的结构不同，分别为弯折极耳911和非弯折极耳911’；对于电芯单元II，每个电芯91b的两个极耳的结构相同，且均为非弯折极耳911’。这样设计为了实现电芯单元之间的电性连接。其中，弯折极耳911的结构与图1中示出的极耳21的结构相同，即，弯折极耳911均包括从电芯延伸(例如朝图2A中的Z方向延伸)出的第一部分和相对于该第一部分弯折的第二部分，第二部分与第一部分之间的夹角例如为90°，该角度有利于对相邻的两个极耳的第二部分进行焊接。非弯折极耳911’包括从电芯延伸出的第一部分，即为直板状极耳。
在一些实施例中，如图3B所示，对于电芯单元I和电芯单元III，相邻的两个电芯的弯折极耳911所采用的直接接触的方式与图2A中相邻的两个极耳所采用的直接接触的方式相类似，具体来说，同一组电芯组91中，极性相同，且相邻的两个弯折极耳911的弯折方向相同，并相互搭接。这里，相邻的两个弯折极耳911在X方向上存在相互重叠的部分。当然，在实际应用中，相邻的两个弯折极耳911的弯折方向也可以相反，或者呈夹角，而且也并不局限于在X方向上相互搭接，在实际应用中，可以在三维空间中的任意方向上相互搭接，而且相邻的两个弯折极耳911的搭接顺序可以任意调整，例如，在X方向上，对于相邻两个弯折极耳911，其中任意一个弯折极耳911可以位于另一个弯折极耳911的左侧。
需要说明的是，在本实施例中，对于每个电芯单元，同一电芯组91中，相邻的两个电芯的同一侧极耳的极性相同，以实现同一电芯组91中的相邻的两个电芯的并联。当然，本发明实施例并不局限于此，在实际应用中，同一电芯组91中的相邻的两个电芯也可以串联或混联。
在一些实施例中，如图3B所示，对于电芯单元I和电芯单元III，不同的电芯组91中的电芯的弯折极耳911均位于电芯的同一侧，且在每相邻的两 组电芯组91中，其中一组电芯组91中的多个电芯的弯折极耳911与其中另一组电芯组中的多个电芯的弯折极耳911的电性相反，且相互搭接，以实现相邻的两组电芯组的串联。例如，如图3B所示，在Z方向上，最上层和最下层的电芯组91中的多个电芯的弯折极耳911均为负极极耳(如图3B中的减号“-”所示)，中间层的电芯组91中的多个电芯的弯折极耳911均为正极极耳(如图3B中的加号“+”所示)，最上层和中间层的电芯组91中的弯折极耳911依次搭接，以实现最上层和中间层的电芯组91的串联。当然，在实际应用中，对于相邻的两组电芯组，根据不同的电性连接方式，不同的电芯组91中的电芯的弯折极耳911也可以位于电芯的不同侧。另外，相邻的两个电芯组也可以并联或者混联。
在一些实施例中，对于电芯单元I和电芯单元III，以图3C所示的电芯单元I为例，每组电芯组91中的各个电芯91a的非弯折极耳911’均与电芯单元II中的每组电芯组91中的各个电芯91b的同一侧的非弯折极耳911’一一对应地搭接，从而实现电芯单元之间的电性连接。
在一些实施例中，如图3C所示，对于电芯单元I，最上层的电芯组91中的各个电芯91a的非弯折极耳911’均为正极极耳，中间层的电芯组91中的各个电芯91a的非弯折极耳911’均为负极极耳，最下层的电芯组91中的各个电芯91a的非弯折极耳911’均为正极极耳。对于电芯单元III，最上层的电芯组91中的各个电芯91c的非弯折极耳911’均为负极极耳，中间层的电芯组91中的各个电芯91c的非弯折极耳911’均为正极极耳，最下层的电芯组91中的各个电芯91c的非弯折极耳911’均为负极极耳。对于电芯单元II，最上层的电芯组91中的各个电芯91b的非弯折极耳911’均为负极极耳，中间层的电芯组91中的各个电芯91b的非弯折极耳911’均为正极极耳，最下层的电芯组91中的各个电芯91b的非弯折极耳911’均为负极极耳。并且，电芯单元I中的各个非弯折极耳911’与电芯单元II中同一侧的各个非弯折 极耳911’的极性相反，且电连接；同样的，电芯单元III中的各个非弯折极耳911’与电芯单元II中同一侧的各个非弯折极耳911’的极性相反，且电连接，从而实现相邻的两个电芯单元之间的串联。当然，在实际应用中，相邻的两个电芯单元之间还可以并联或者混联。
需要说明的是，在本变型实施例中，对于电芯单元I和电芯单元III，每个电芯的两个极耳的结构不同，分别为弯折极耳911和非弯折极耳911’；对于电芯单元II，每个电芯91b的两个极耳的结构相同，且均为非弯折极耳911’。但是，本发明实施例并不局限于此，在实际应用中，对于电芯单元I、电芯电源II和电芯单元III，每个电芯的两个极耳也可以均为弯折极耳911，这同样也可以利用相邻的两个弯折极耳911的搭接或者其他接触方式来实现相邻的两个电芯单元之间的电性连接。
作为本实施例的另一个变型实施例，请参阅图3D，本变型实施例提供一种电芯模组9’，其与上述变型实施例相比，其区别仅在于：只有一个电芯单元，该电芯单元包括在Z方向上依次堆叠的多组电芯组91’，每组电芯组91’包括在Z方向上依次堆叠的多个电芯。例如，图3D示出了电芯单元包括在Z方向上依次堆叠的三组电芯组91’，每组电芯组91’包括在Z方向上依次堆叠的三个电芯(91a’,91b’,91c’)。
而且，每个电芯均具有两个极耳，分别为负极极耳和正极极耳，二者分别位于电芯的彼此相对的两侧。每相邻的两个电芯的极耳采用直接接触的方式电连接，这里，“每相邻的两个电芯的极耳”可以是在同一组电芯组中，或者是在相邻的两组电芯组之间，以实现同一组电芯组中的多个电芯的电性连接以及不同的电芯组之间的电性连接。上述电性连接可以是并联、串联或者混联。
在一些实施例中，如图3D所示，每个电芯的两个极耳均为弯折极耳911，该弯折极耳911的结构与图1中示出的极耳21的结构相同，即，弯折极耳 911均包括从电芯同一侧延伸(例如朝图2A中的Z方向延伸)出的第一部分和相对于该第一部分弯折的第二部分，第二部分与第一部分之间的夹角例如为90°，该角度有利于对相邻的两个极耳的第二部分进行焊接。并且，每个电芯的两个极耳的弯折方向相反。当然，在实际应用中，根据不同的需要，也可以使每个电芯的两个极耳的弯折方向相同。
在一些实施例中，如图3D所示，相邻的两个电芯的弯折极耳911所采用的直接接触的方式与图2A中相邻的两个极耳所采用的直接接触的方式相类似，具体来说，同一组电芯组91’中，极性相同、位于同一侧，且相邻的两个弯折极耳911的弯折方向相同，并相互搭接。这里，相邻的两个弯折极耳911在X方向上存在相互重叠的部分。当然，在实际应用中，相邻的两个弯折极耳911的弯折方向也可以相反，或者呈夹角，而且也并不局限于在X方向上相互搭接，在实际应用中，可以在三维空间中的任意方向上相互搭接，而且相邻的两个弯折极耳911的搭接顺序可以任意调整，例如，在X方向上，对于相邻两个弯折极耳911，其中任意一个弯折极耳911可以位于另一个弯折极耳911的左侧。
需要说明的是，在本实施例中，同一电芯组91’中，相邻的两个电芯的同一侧极耳的极性相同，以实现同一电芯组91中的相邻的两个电芯的并联。当然，本发明实施例并不局限于此，在实际应用中，同一电芯组91’中的相邻的两个电芯也可以串联或混联。
在一些实施例中，如图3D所示，在每相邻的两组电芯组91’中，其中一组电芯组91’中的多个电芯的弯折极耳911与位于同一侧的其中另一组电芯组91’中的多个电芯的弯折极耳911的电性相反，且相互搭接，以实现相邻的两组电芯组的串联。例如，如图3D所示，在Z方向上，最上层和最下层的电芯组91’中的多个电芯的左侧的弯折极耳911均为正极极耳(如图3D中的减号“-”所示)，右侧的弯折极耳911均为负极极耳(如图3D中的加 号“+”所示)；中间层的电芯组91’中的多个电芯的左侧的弯折极耳911均为负极极耳，右侧的弯折极耳911均为正极极耳。其中，最下层和中间层的电芯组91’之间，位于左侧的相邻的负极极耳与正极极耳相互搭接，最上层和中间层的电芯组91’之间，位于右侧的相邻的负极极耳与正极极耳相互搭接，从而实现三组电芯组91’依次串联。当然，在实际应用中，根据不同的电性连接方式，在每相邻的两组电芯组91’中，也可以使其中一组电芯组91’中的多个电芯的弯折极耳911与位于同一侧的其中另一组电芯组91’中的多个电芯的弯折极耳911的电性相同，且相互搭接，以实现相邻的两个电芯组的并联。另外，相邻的两个电芯组也可以混联。
作为本实施例的又一个变型实施例，请参阅图3E，本变型实施例提供一种电芯模组9”，其与图3D示出的上述变型实施例相比，其区别仅在于：相邻的两个极耳的极性和搭接方式不同。具体地，本变型实施例提供的电芯模组9”只有一个电芯单元，该电芯单元包括在Z方向上依次堆叠的多组电芯组91”，每组电芯组91”包括在Z方向上依次堆叠的多个电芯。例如，图3E示出了电芯单元包括在Z方向上依次堆叠的三组电芯组91”，每组电芯组91”包括在Z方向上依次堆叠的三个电芯(91a”,91b”,91c”)。
而且，每个电芯均具有两个极耳，分别为负极极耳和正极极耳，二者分别位于电芯的彼此相对的两侧。每相邻的两个电芯的极耳采用直接接触的方式电连接，这里，“每相邻的两个电芯的极耳”可以是在同一组电芯组中，或者是在相邻的两组电芯组之间，以实现同一组电芯组中的多个电芯的电性连接以及不同的电芯组之间的电性连接。上述电性连接可以是并联、串联或者混联。
在一些实施例中，如图3E所示，每个电芯的两个极耳均为弯折极耳911，该弯折极耳911的结构与图2C中示出的极耳的结构相同，即，弯折极耳911均包括从电芯同一侧延伸(例如朝图2A中的Z方向延伸)出的第一部分和 相对于该第一部分弯折的第二部分，第二部分与第一部分之间的夹角例如为90°，该角度有利于对相邻的两个极耳的第二部分进行焊接。并且，每个电芯的两个极耳的弯折方向相反。当然，在实际应用中，根据不同的需要，也可以使每个电芯的两个极耳的弯折方向相同。
在一些实施例中，如图3E所示，相邻的两个电芯的弯折极耳911所采用的直接接触的方式与图2C中相邻的两个极耳所采用的直接接触的方式相类似，具体来说，同一组电芯组91”中，极性相反、位于同一侧，且相邻的两个弯折极耳911的弯折方向相反，并相互搭接。这里，相邻的两个弯折极耳911在X方向上存在相互重叠的部分。当然，在实际应用中，相邻的两个弯折极耳911的弯折方向也可以相反，或者呈夹角，而且也并不局限于在X方向上相互搭接，在实际应用中，可以在三维空间中的任意方向上相互搭接，而且相邻的两个弯折极耳911的搭接顺序可以任意调整，例如，在X方向上，对于相邻两个弯折极耳911，其中任意一个弯折极耳911可以位于另一个弯折极耳911的左侧。
需要说明的是，同一组电芯组中的多个电芯之间的电性连接方式可以有多种，而并不局限于本变形实施例采用的串联方式，还可以是并联或者混联。不同的电芯组之间的电性连接方式也可以有多种，而并不局限于本实施例采用的串联，也可以是并联或者混联。
作为另一个技术方案，本发明实施例还提供一种电芯总成，其包括本发明实施例提供的上述电芯模组。
本发明实施例还提供一种电芯总成，其通过采用本发明实施例提供的上述电芯模组，不仅可以实现多个电芯的电性连接，同时保证满足载流的要求，而且可以不使用汇流排，从而可以减小电芯模组的体积，简化模组的制作工艺，进而可以提高生产效率，降低电芯的制作成本。
在一些实施例中，电芯模组为多个，且依次堆叠，并且相邻的两个电芯 模组之间设置有防火片。电芯模组有可能发生火灾，在电芯模组发生起火时候，防火片对于防止火势蔓延起到了积极作用。
作为另一个技术方案，本发明实施例还提供一种电芯模组的连接方法，其采用本发明实施例提供的上述电芯模组，该连接方法包括：
将每相邻的两个电芯的极耳采用直接接触的方式电连接，以实现多个电芯的电性连接。
本发明实施例提供的电芯模组的连接方法，通过将每相邻两个电芯的极耳采用直接接触的方式电连接，不仅可以实现多个电芯的电性连接，同时保证满足载流的要求，而且可以不使用汇流排，从而可以减小电芯模组的体积，简化模组的制作工艺，进而可以提高生产效率，降低电芯的制作成本。
在一些实施例中，采用激光焊接的方式将每相邻的两个电芯的极耳电连接。
激光焊接的方式可以使得每相邻的两个电芯的极耳的连接较为紧固，从而可以提高电芯模组的使用寿命。
在一些实施例中，如图1和图2A所示，每个极耳21均包括从电芯同一侧延伸(例如朝图2A中的Z方向延伸)出的第一部分211和相对于该第一部分211弯折的第二部分212。在这种情况下，采用激光焊接的方式将每相邻的两个电芯的极耳电连接，包括以下步骤：
S1、提供一激光焊接工装；
上述激光焊接工装包括激光治具组件，该激光治具组件位于极耳的第二部分212的靠近电芯的一侧，用于支撑该第二部分212，并保护第二部分212以及位于第二部分212的靠近电芯的一侧的部件；
S2、使用激光自第二部分212的远离电芯的一侧焊接每相邻的两个极耳21的第二部分212。
借助上述激光焊接工装，可以在激光焊透搭接在一起的极耳21的第二 部分212时，将激光能量控制在安全范围内，从而可以保证第二部分212在被激光射穿后不会因温度过高而产生变形，同时保护位于第二部分212以下的第一部分211以及电芯不被激光照射。
作为另一个技术方案，本发明实施例还提供一种激光焊接工装，其用于辅助采用激光焊接的方式将每相邻的两个电芯的极耳电连接，以图1和图2A所示的电芯的极耳为例，每个极耳21均包括从电芯延同一侧伸出的第一部分211和相对于该第一部分211弯折的第二部分212；其中，每相邻两个电芯的极耳21的第二部分212的弯折方向相同，且相互搭接。
该激光焊接工装包括激光治具组件，该激光治具组件用于在激光焊接时位于极耳的第二部分的靠近电芯的一侧，以支撑该第二部分，并保护该第二部分以及位于其靠近电芯的一侧的部件。
本发明实施例提供的激光焊接工装，通过将每相邻两个电芯的极耳采用直接接触的方式电连接，不仅可以实现多个电芯的电性连接，同时保证满足载流的要求，而且可以不使用汇流排，从而可以减小电芯模组的体积，简化模组的制作工艺，进而可以提高生产效率，降低电芯的制作成本。
上述激光治具组件的结构可以有多种，例如，如图4所示，激光治具组件3包括第一激光治具31和第二激光治具32，第一激光治具31和第二激光治具32在激光焊接时均位于第二部分212的靠近电芯的一侧，且第二激光治具32位于第一激光治具31的远离电芯的一侧(即，在图4中，第二激光治具32位于第一激光治具31的上方)，并且第一激光治具31和第二激光治具32中均设置有供电极的第一部分穿过的插槽33，该插槽33还可以起到限定极耳位置的作用，以确保焊接精度。
其中，第一激光治具31用于吸收激光能量，以能够通过散热将激光能量控制在安全范围内，从而可以保证第二部分212在被激光射穿后不会因温度过高而产生变形；第二激光治具32用于支撑第二部分212，且采用透射激 光的材质制作，以使激光能够穿过第二激光治具32，并照射到第一激光治具31上。此外，第二激光治具32还用于隔离极耳的第二部分212和第一激光治具31，避免二者被焊接在一起。
在一些实施例中，第二激光治具32所采用的材质包括高硼硅玻璃，高硼硅玻璃比普通硅酸盐玻璃的融化温度高，可以避免第二激光治具32因焊接温度过高而损坏，且透光性能优质，可以有效透射激光。
在一些实施例中，第一激光治具31所采用的材质包括诸如不锈钢或石墨等的具有较好导热性能的材质，从而可以避免电芯模组1因为焊接产生的热量而变形，另外，不锈钢具有较高的强度且造价低廉，降低成本的同时使得第一激光治具31结实耐用。
在一些实施例中，上述第一激光治具31包括包括第一子治具311和第二子治具312，第二激光治具32包括第三子治具321和第四子治具322，且第三子治具321和第四子治具322分别与第一子治具311和第二子治具312对应设置，即，第三子治具321对应位于第一子治具311的上方，第四子治具322对应位于第二子治具312的上方。
并且，上述插槽33包括分别设置在第一子治具311和第二子治具312上的第一子插槽331，以及分别设置在第三子治具321和第四子治具322上的第二子插槽332。第一子插槽331和第二子插槽332在图4中的Y方向上均具有开口，以供极耳的第一部分移入或移出。
在本实施例中，激光焊接工装还包括第一辅助组件和第二辅助组件，二者均采用如图4所示的移动结构6，该移动结构6可以有多种结构，例如包括移动板61和与之连接的移动轴62，其中，移动板61沿Z方向竖直设置，且两个移动板61在Y方向上相对设置。通过手动或自动驱动移动轴62在Y方向上移动，可以使两个移动板61相互靠近或远离。另外，上述第一子治具311和第二子治具312，以及第三子治具321和第四子治具322均通过螺钉与 相应的移动板6固定连接。
对于自动驱动移动轴62在Y方向上移动的方式，上述移动轴62可以与直线驱动源连接，例如直线液压缸、直线气缸或者直线电机等等。
其中，第一辅助组件的上述移动结构6用于带动均位于图4左侧的第一子治具311与第三子治具321同步移动，第二辅助组件的上述移动结构6用于带动均位于图4右侧的第二子治具312与第四子治具322同步移动，以使第一子治具311和第二子治具312相互对接或者分离，同时第三子治具321和第四子治具322相互对接或者分离。图5A中示出了第一子治具311和第二子治具312相互分离，第三子治具321和第四子治具322相互分离的第一种状态，此时可以进行电芯模组1的取放；图5B中示出了第一子治具311和第二子治具312相互对接，第三子治具321和第四子治具322相互对接的第二种状态，此时可以进行激光焊接。
并且，第一子治具311和第二子治具312在相互对接或者分离的过程中，相应的极耳的第一部分移入或移出上述第一子插槽331；第三子治具321和第四子治具322在相互对接或者分离的过程中，相应的极耳的第一部分移入或移出上述第二子插槽332。
通过将上述第一激光治具31和第二激光治具32各自分为两个子治具，并利用上述移动结构6带动对应的两个子治具对接或分离，可以更方便和准确地对极耳进行激光焊接。
在一些实施例中，激光焊接工装还包括底板4，电芯模组1设置在该底板4上，且在底板4上设置有导轨41，该导轨41的延伸方向(即，Y方向)与多个电芯的堆叠方向(即，X方向)相互垂直；上述第一辅助组件和第二辅助组件(例如移动板61)上均设置有与导轨滑动配合的滑动结构(图中未示出)，该滑动结构用于带动上述第一辅助组件和第二辅助组件沿导轨41滑动。滑动结构例如为与导轨4滑动配合的滑槽。借助上述导轨41和滑动结构， 可以对上述第一辅助组件和第二辅助组件起到导向作用，从而可以进一步提高焊接精度，同时还可以保证极耳的第一部分能够准确地移入相应的子插槽中。
在一些实施例中，在底板4上，且位于上述第一辅助组件和第二辅助组件(即，两个移动板61)之间还设置有两个夹板(51，52)，两个夹板(51，52)在多个电芯的堆叠方向(即，X方向)上相对设置，用于将电芯模组1夹持在二者之间。
在一些实施例中，如图4所示，夹板51的上端开有置取槽511，对应地在夹板52的上端也开设有置取槽(图中未示出)，用以方便地将电芯模组1从两个夹板(51，52)之间取出。
在一些实施例中，如图6所示，在第一子治具311和第二子治具312相互对接的两个对接面上分别设置有凸部311a和凹部312a，二者相互配合，以能够限定第一子治具311和第二子治具312的对接位置，保证焊接精度。
在使用上述激光焊接工装对电芯模组1进行激光焊接时，电芯模组的连接方法包括：
步骤1、将电芯模组1置入两个夹板(51，52)之间；
步骤2、控制两个移动轴62分别推动两个移动板62朝彼此靠近的方向移动，在此过程中，两个移动板62分别带动第一子治具311与第三子治具321以及第二子治具312与第四子治具322同步移动，直至第一子治具311和第二子治具312相互对接，第三子治具321和第四子治具322相互对接；在对接过程中，极耳21的第一部分进入相应的子插槽中。
如图5B所示，在完成对接之后，使极耳的第二部分212、第二激光治具32和第一激光治具31从上到下依次设置。
步骤3、使用激光从上往下焊接极耳的相互搭接的第二部分212；
步骤4、在完成激光焊接之后，控制两个移动轴62分别推动两个移动板 62朝彼此远离的方向移动，在此过程中，两个移动板62分别带动第一子治具311与第三子治具321以及第二子治具312与第四子治具322同步移动，直至第一子治具311和第二子治具312相互分离，第三子治具321和第四子治具322相互分离；在分离过程完成之后，通过置取槽511取出电芯模组1。
重复上述步骤1-5即可完成电芯模组1的激光焊接。
上述激光治具组件的结构还可以采用其他结构，例如，如图7所示，激光治具组件7包括第一激光治具71和第二激光治具72，其中，第一激光治具71位于极耳的第二部分212的靠近电芯的一侧，且设置有供第一部分212穿过的插槽74，该插槽74还可以起到限定极耳位置的作用，以确保焊接精度。第一激光治具71用于支撑极耳的第二部分212，同时还可以对极耳的第二部分212起到散热的作用。并且，在第一激光治具71上还设置有激光避让槽75，该激光避让槽75用于防止激光直接照射在第一激光治具71的平面上产生炸点，从而可以提高焊接的安全性。激光避让槽75的深度例如在2mm以上。
上述第二激光治具72位于极耳的第二部分212的远离电芯的一侧，用于压住该第二部分212，同时还可以对极耳的第二部分212起到散热的作用。而且，在第二激光治具72上对应各个第二部分212的位置处设置有供激光穿过的通槽73。
上述第一激光治具71和第二激光治具72均能够通过散热将激光能量控制在安全范围内，从而可以保证第二部分212在被激光射穿后不会因温度过高而产生变形。
在一些实施例中，第一激光治具71包括第一子治具711和第二子治具712，第二激光治具72包括第三子治具721和第四子治具722，且第三子治具721和第四子治具722分别与第一子治具711和第二子治具712对应设置，即，第三子治具721对应位于第一子治具711的上方，第四子治具722对应 位于第二子治具712的上方。
上述插槽74包括分别设置在第一子治具711和第二子治具712上的子插槽。该子插槽在图7中的Y方向上具有开口，以供极耳的第一部分移入或移出。
而且，激光焊接工装还包括第一辅助组件和第二辅助组件，二者均采用如图7所示的移动结构6，该移动结构6与上述图4所示的移动结构6相同，由于在前文中已有了详细描述，在此不再赘述。上述第一子治具711和第二子治具712，以及第三子治具721和第四子治具722均通过螺钉与相应的移动板6固定连接。
其中，第一辅助组件的上述移动结构6用于带动均位于图7左侧的第一子治具711与第三子治具721同步移动，第二辅助组件的上述移动结构6用于带动均位于图7右侧的第二子治具712与第四子治具722同步移动，以使第一子治具711和第二子治具712相互靠近或者分离，同时第三子治具721和第四子治具722相互靠近或者分离。图8A中示出了第三子治具721和第四子治具722相互靠近的状态，图8B中示出了第一子治具711和第二子治具712相互靠近的状态，此时可以进行激光焊接。
并且，第一子治具711和第二子治具712在相互靠近或者分离的过程中，相应的极耳的第一部分移入或移出插槽74的上述子插槽。
通过将上述第一激光治具71和第二激光治具72各自分为两个子治具，并利用上述移动结构6带动对应的两个子治具对接或分离，可以更方便和准确地对极耳进行激光焊接。
在一些实施例中，激光治具组件7还包括支撑冷却机构，该支撑冷却机构与第一激光治具71连接，第二激光治具72与第一激光治具71连接；该支撑冷却机构用于支撑第二激光治具72与第一激光治具71，并对二者进行冷却。借助支撑冷却机构，可以进一步减少极耳的第二部分的热量，从而可以 有效保证第二部分212在被激光射穿后不会因温度过高而产生变形。而且，对于第一激光治具71包括第一子治具711和第二子治具712的情况，上述支撑冷却机构包括第一支撑冷却件81和第二支撑冷却件82，二者分别与两个移动板61固定连接，且在每个支撑冷却件中设置有用于输送冷却水的通道，用以起到冷却作用。
另外，图7中示出的底板4、两个夹板(51，52)等其他部件的结构与图4示出的相应部件相同，在此不再赘述。
综上所述，本发明实施例提供的电芯模组及其连接方法、电芯总成及激光焊接工装的技术方案，通过将每相邻两个电芯的极耳采用直接接触的方式电连接，不仅可以实现多个电芯的电性连接，同时保证满足载流的要求，而且可以不使用汇流排，从而可以减小电芯模组的体积，简化模组的制作工艺，进而可以提高生产效率，降低电芯的制作成本。
以上结合附图详细描述了本发明的优选实施方式，但是，本发明并不限于此。在本发明的技术构思范围内，可以对本发明的技术方案进行多种简单变型。包括各个具体技术特征以任何合适的方式进行组合。为了避免不必要的重复，本发明对各种可能的组合方式不再另行说明。但这些简单变型和组合同样应当视为本发明所公开的内容，均属于本发明的保护范围。

Claims (22)

  1. 一种电芯模组，其特征在于，包括至少一组电芯组，每组所述电芯组包括堆叠的多个电芯，且每相邻两个所述电芯的极耳采用直接接触的方式电连接，以实现多个所述电芯的电性连接。
  2. 根据权利要求1所述的电芯模组，其特征在于，每个所述极耳均包括从所述电芯同一侧延伸出的第一部分和相对于所述第一部分弯折的第二部分；其中，每相邻两个所述电芯的极耳的所述第二部分的弯折方向相同，且相互搭接。
  3. 根据权利要求2所述的电芯模组，其特征在于，在与多个所述电芯的堆叠方向相互垂直的方向上，相邻两个所述电芯的极耳的所述第二部分部分交错。
  4. 根据权利要求2所述的电芯模组，其特征在于，每个所述电芯的极耳为两个，分别为正极极耳和负极极耳，且所述正极极耳和负极极耳的所述第二部分的弯折方向相反，并且每相邻两个所述电芯的正极极耳的所述第二部分的弯折方向相同，且相互搭接；每相邻两个所述电芯的负极极耳的所述第二部分的弯折方向相同，且相互搭接，以实现多个所述电芯的并联。
  5. 根据权利要求2所述的电芯模组，其特征在于，每个所述电芯的极耳为两个，分别为正极极耳和负极极耳，并且
    每相邻的两个所述电芯中，其中一个所述电芯的正极极耳的所述第二部分与其中另一个所述电芯的负极极耳的所述第二部分相互搭接，以实现每相邻的两个所述电芯的串联。
  6. 根据权利要求1-5任意一项所述的电芯模组，其特征在于，每相邻两个所述电芯的极耳采用激光焊接的方式连接。
  7. 根据权利要求1-3任意一项所述的电芯模组，其特征在于，所述电芯组为多组，且多组所述电芯组沿多个所述电芯的堆叠方向设置；并且，每个所述电芯的极耳为两个，分别为正极极耳和负极极耳，对于每组所述电芯组，每相邻的两个所述电芯的正极极耳电连接，每相邻的两个所述电芯的负极极耳电连接，以实现多个所述电芯的并联；或者，每相邻的两个所述电芯中，其中一个所述电芯的正极极耳与其中另一个所述电芯的负极极耳电连接，以实现每相邻的两个所述电芯的串联；
    在每相邻的两组所述电芯组中，其中一组所述电芯组中的所述电芯的正极极耳与其中另一组所述电芯组中的多个所述电芯的负极极耳电连接，以实现相邻的两组所述电芯组的串联；或者，相邻的两组所述电芯组中的所述电芯的正极极耳电连接，相邻的两组所述电芯组中的所述电芯的负极极耳电连接，以实现相邻的两组所述电芯组的并联。
  8. 根据权利要求1所述的电芯模组，其特征在于，每个所述电芯的极耳为两个，分别为正极极耳和负极极耳，且分别位于所述电芯的彼此相对的两侧，并且，每个所述电芯的两个极耳均包括从所述电芯延伸出的第一部分和相对于所述第一部分弯折的第二部分；其中，每相邻两个所述电芯的极耳的所述第二部分相互搭接；
    或者，每个所述电芯的两个极耳中，第一个极耳包括从所述电芯延伸出的第一部分和相对于所述第一部分弯折的第二部分，第二个极耳包括从所述电芯延伸出的第一部分；其中，每相邻的两个电芯的所述第一个极耳的所述第二部分相互搭接，或者每相邻的两个电芯的所述第二个极耳的所述第一部分相互搭接。
  9. 根据权利要求8所述的电芯模组，其特征在于，所述电芯模组包括至少一个电芯单元，每个所述电芯单元包括多组所述电芯组，每相邻的两组所述电芯组中，相邻的两个所述电芯的极耳电连接；
    所述电芯单元为多个时，每相邻的两个所述电芯单元中，其中一个所述电芯单元中的各个所述电芯的同一侧极耳与其中另一个所述电芯单元中的各个所述电芯的同一侧极耳一一对应地电连接，以实现相邻的两个所述电芯单元之间的电性连接。
  10. 一种电芯总成，其特征在于，包括权利要求1-9任意一项所述的电芯模组。
  11. 根据权利要求10所述的电芯总成，其特征在于，所述电芯模组为多个，且相邻的两个所述电芯模组之间设置有防火片。
  12. 一种电芯模组的连接方法，其特征在于，所述电芯模组采用权利要求1-9任意一项所述的电芯模组，所述连接方法包括：
    将每相邻的两个电芯的极耳采用直接接触的方式电连接，以实现多个所述电芯的电性连接。
  13. 根据权利要求12所述的电芯模组的连接方法，其特征在于，采用激光焊接的方式将每相邻的两个电芯的极耳电连接。
  14. 根据权利要求13所述的电芯模组的连接方法，其特征在于，每个所述极耳均包括从所述电芯延同一侧伸出的第一部分和相对于所述第一部分弯折的第二部分；其中，每相邻两个所述电芯的极耳的所述第二部分的弯折方向相同，且相互搭接；
    所述采用激光焊接的方式将每相邻的两个电芯的极耳电连接，包括以下 步骤：
    S1、提供一激光焊接工装，所述激光焊接工装包括激光治具组件，所述激光治具组件位于所述第二部分的靠近所述电芯的一侧，用于支撑所述第二部分，并保护所述第二部分以及位于所述第二部分的靠近所述电芯的一侧的部件；
    S2、使用激光自所述第二部分的远离所述电芯的一侧焊接每相邻的两个所述极耳的所述第二部分。
  15. 一种激光焊接工装，其特征在于，所述激光焊接工装用于辅助采用激光焊接的方式将每相邻的两个电芯的极耳电连接，每个所述极耳均包括从所述电芯延同一侧伸出的第一部分和相对于所述第一部分弯折的第二部分；其中，每相邻两个所述电芯的极耳的所述第二部分的弯折方向相同，且相互搭接；
    所述激光焊接工装包括激光治具组件，所述激光治具组件用于在激光焊接时位于所述第二部分的靠近所述电芯的一侧，以支撑所述第二部分，并保护所述第二部分以及位于所述第二部分的靠近所述电芯的一侧的部件。
  16. 根据权利要求15所述的激光焊接工装，其特征在于，所述激光治具组件包括第一激光治具和第二激光治具，所述第一激光治具和第二激光治具在激光焊接时均位于所述第二部分的靠近所述电芯的一侧，且所述第二激光治具位于所述第一激光治具的远离所述电芯的一侧，并且所述第一激光治具和第二激光治具中均设置有供所述第一部分穿过的插槽；其中，
    所述第一激光治具用于吸收激光能量；
    所述第二激光治具用于支撑所述第二部分，且采用透射激光的材质制作。
  17. 根据权利要求16所述的激光焊接工装，其特征在于，所述第一激 光治具包括第一子治具和第二子治具，所述第二激光治具包括第三子治具和第四子治具，且分别与所述第一子治具和第二子治具对应设置；
    所述插槽包括分别设置在所述第一子治具和第二子治具上的第一子插槽，以及分别设置在所述第三子治具和第四子治具上的第二子插槽；
    所述激光焊接工装还包括第一辅助组件和第二辅助组件，其中，所述第一辅助组件用于带动所述第一子治具与所述第三子治具同步移动，所述第二辅助组件用于带动所述第二子治具与所述第四子治具同步移动，以使所述第一子治具与所述第二子治具相互对接或者分离，同时所述第三子治具与所述第四子治具相互对接或者分离；并且，所述第一子治具和第二子治具在相互对接或者分离的过程中，相应的所述第一部分移入或移出所述第一子插槽；所述第三子治具和第四子治具在相互对接或者分离的过程中，相应的所述第一部分移入或移出所述第二子插槽。
  18. 根据权利要求15所述的激光焊接工装，其特征在于，所述激光治具组件包括第一激光治具和第二激光治具，其中，
    所述第一激光治具位于所述第二部分的靠近所述电芯的一侧，且设置有供所述第一部分穿过的插槽，所述第一激光治具用于支撑所述第二部分，并且在所述第一激光治具上还设置有激光避让槽；
    所述第二激光治具位于所述第二部分的远离所述电芯的一侧，用于压住所述第二部分，且在所述第二激光治具上对应各个所述第二部分的位置处设置有供激光穿过的通槽。
  19. 根据权利要求18所述的激光焊接工装，其特征在于，所述第一激光治具包括第一子治具和第二子治具，所述第二激光治具包括第三子治具和第四子治具，且分别与所述第一子治具和第二子治具对应设置；
    所述插槽包括分别设置在所述第一子治具和第二子治具上的子插槽；
    所述激光焊接工装还包括第一辅助组件和第二辅助组件，其中，所述第一辅助组件用于带动所述第一子治具与所述第三子治具同步移动，所述第二辅助组件用于带动所述第二子治具与所述第四子治具同步移动，以使所述第一子治具与所述第二子治具相互靠近或者分离，同时所述第三子治具与所述第四子治具相互靠近或者分离；并且，所述第一子治具和第二子治具在相互靠近或者分离的过程中，相应的所述第一部分移入或移出所述子插槽。
  20. 根据权利要求17或19所述的激光焊接工装，其特征在于，所述激光焊接工装还包括底板，所述电芯模组设置在所述底板上，且在所述底板上设置有导轨，所述导轨的延伸方向与所述多个电芯的堆叠方向相互垂直；所述第一辅助组件和第二辅助组件上均设置有与所述导轨滑动配合的滑动结构，所述滑动结构用于带动所述第一辅助组件和第二辅助组件沿所述导轨滑动。
  21. 根据权利要求20所述的激光焊接工装，其特征在于，在所述底板上，且位于所述第一辅助组件和第二辅助组件之间还设置有两个夹板，所述两个夹板在所述多个电芯的堆叠方向上相对设置，用于将所述电芯模组夹持在二者之间。
  22. 根据权利要求18所述的激光焊接工装，其特征在于，所述激光治具组件还包括支撑冷却机构，所述支撑冷却机构与所述第一激光治具连接，所述第二激光治具与所述第一激光治具连接；所述支撑冷却机构用于支撑所述第二激光治具与所述第一激光治具，并对二者进行冷却。
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