A glue-nail connecting structure, a battery pack and a preparation method thereof

Abstract

The present application relates to a kind of glue nail connecting structure, battery pack and its preparation method, glue nail connecting structure includes sheet fixing part and glue nail part, sheet fixing part is conductor, fixing part can be set on the top / bottom of single battery, or the top / bottom of battery module, fixing part has opening;Glue nail part is formed by structural glue solidification, its upper part is set in opening, lower part is connected with the side shell of single battery or top pole, by the glue nail part, sheet fixing part and the side shell of single battery or top pole can be connected simultaneously, the peel strength of structural glue set between sheet fixing part and the top of single battery is converted into longitudinal shear resistance provided by glue nail connecting structure, so that the peel strength of sheet fixing part is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of new energy power batteries, and in particular to a glue nail connection structure, a battery pack and its preparation method. Background Technology

[0002] In the application of cylindrical battery packs, during the process of sealing the structure between multiple cylinders using adhesive methods, sheet-like fixing plates are often used to cover the top or bottom of adjacent cylinders. The lateral shear force of the adhesive added therein is used to limit the displacement of the plane between adjacent cylinders.

[0003] However, when external vibrations are transmitted to the connection area at the top of the cylinder through the sheet-like fixing plate, or when adjacent batteries experience vertical displacement forces during vibration, the adhesive's peeling force is relatively weak, which often leads to the fixing plate being torn apart from the adhesive structure at the top, resulting in structural connection failure.

[0004] In addition, for conductors stacked one on top of the other, such as sheet busbars and sheet poles, maintaining a sufficient and stable electrical contact area between them without being torn apart under vibration conditions, and overcoming the difficulty of weak adhesive peeling force, is also a problem that the industry needs to solve. Summary of the Invention

[0005] This invention discloses a glue-nail connection structure, a battery pack, and a method for preparing the same, which addresses a series of problems existing in the prior art.

[0006] In a first aspect, this application provides a glued nail connection structure, including a fastener and a glued nail portion;

[0007] A fastener for securing to the top of a single battery cell; the fastener has an opening.

[0008] The adhesive nail part includes a nail body formed by curing structural adhesive. After curing, the adhesive nail part is roughly columnar. The upper part of the nail body is located in the opening and is bonded to the inner wall of the opening. The lower part of the nail body can be bonded to the side shell of the single battery cell.

[0009] As a preferred technical solution, the present invention also provides another adhesive nail connection structure, comprising: at least one adhesive nail portion, a first conductor and a second conductor stacked parallel to each other; the first conductor has a first opening; the first opening is a through hole; the second conductor has a second opening, the second opening being positioned corresponding to the first opening; conductive adhesive is disposed in at least a portion of the gap area between the first conductor and the second conductor adjacent to the first opening and the second opening, the conductive adhesive electrically connecting the first conductor and the second conductor; the adhesive nail portion includes a nail body formed by curing structural adhesive, the adhesive nail portion being approximately columnar after the structural adhesive has cured; the adhesive nail portion is disposed within the first opening and the second opening, and is bonded to the inner walls of the first opening and the second opening.

[0010] In a second aspect, the present invention also provides a battery pack comprising a plurality of individual battery cells arranged in an array;

[0011] At least one fastener is disposed on top of a plurality of individual cells arranged in an array;

[0012] The individual battery cell is connected to the fixing structure using the adhesive nail connection structure described above.

[0013] As a preferred technical solution, the present invention also provides another battery pack structure, including:

[0014] At least one bus, the bus including a plurality of first conductors;

[0015] Multiple individual cells arranged in an array, wherein the top terminal of each individual cell has a second conductor;

[0016] The busbar is electrically connected to the top terminal of the individual battery using the adhesive nail connection structure described above, and the structure is also connected.

[0017] Thirdly, the present invention also provides an electrical connection assembly, comprising:

[0018] Provide the first conductor;

[0019] Provide a second conductor;

[0020] The busbar is electrically connected to the top terminal of the individual battery using the adhesive nail connection structure described above, and the structure is also connected.

[0021] Fourthly, the present invention also provides a method for preparing a battery pack, comprising:

[0022] Multiple individual battery cells are arranged in an array to form a battery array;

[0023] The fastener is positioned on top of the battery array;

[0024] Insert the injection head into the pre-set position at the lower end of the nail body in the opening, and lift the injection head while injecting the structural adhesive to form an adhesive column; the structural adhesive is a UV-curing adhesive;

[0025] When the dispensing head is raised to the opening position, the dispensing head stops briefly or slows down its upward movement, and then stops dispensing.

[0026] This causes the adhesive column to adhere to the inner wall of the opening and the side casing of at least one individual cell, forming an adhesive pile at the opening location.

[0027] UV curing involves irradiating the adhesive columns and adhesive piles with ultraviolet light to cure them and form adhesive nails.

[0028] Compared with the prior art, the technical solution adopted in this invention can achieve the following beneficial effects:

[0029] This invention mainly provides a glue-nail connection structure, which includes at least a sheet-shaped fastener and a glue-nail portion. The sheet-shaped fastener is a conductor and can be disposed on the top / bottom of a single battery cell or the top / bottom of a battery module. The fastener has an opening. The glue-nail portion is formed by curing structural adhesive. Its upper part is disposed in the opening, and its lower part is connected to the side shell of the single battery cell. Through the glue-nail portion, the sheet-shaped fastener and the side shell of the single battery cell can be connected simultaneously. The peel resistance of the structural adhesive disposed between the sheet-shaped fastener and the top of the single battery cell is converted into the longitudinal shear resistance provided by the glue-nail connection structure, thereby greatly improving the peel resistance of the sheet-shaped fastener.

[0030] In a more preferred technical solution, the glued nail part of the glued nail connection structure is further provided with an inner core, which can be a hollow cylindrical shape, a solid column shape, or a fibrous body, to improve the longitudinal tensile strength of the glued nail part.

[0031] In another technical solution of the present invention, another adhesive nail connection structure is provided, including a first conductor, a second conductor, and an adhesive nail portion. The first conductor is electrically connected to the top terminal of the single cell, or the first conductor is the top terminal of the single cell. Conductive adhesive is provided in a portion of the area between the first conductor and the second conductor. The second conductor is preferably a busbar. Openings are provided at corresponding positions of the first conductor and the second conductor. The adhesive nail portion is disposed in the opening. A nail cap is provided at the upper end of the adhesive nail portion, and a nail root is provided at the bottom of the adhesive nail portion. Countersunk holes are provided at corresponding positions of the first conductor and the second conductor. The top cap and nail root can further enhance the anti-peeling force between the first conductor and the second conductor.

[0032] In this technical solution, the interior of the adhesive nail part is preferably provided with an inner core; the inner core part can be a hollow transparent cylindrical structure, which can enhance the longitudinal tensile strength of the adhesive nail connection structure on the one hand, and ensure the penetration of ultraviolet rays on the other hand, which is conducive to the curing of the structural adhesive into the adhesive nail part. Furthermore, it can also reduce the overall weight of the entire battery module.

[0033] The inner core can also be made of filaments, which can be distributed in the nail head and nail root to enhance the structural strength of the entire glued nail connection structure.

[0034] More preferably, the present invention also provides a battery pack having the above-mentioned adhesive nail connection structure, the battery pack including several individual cells, a busbar and adhesive nail connection structure. Since the top terminal of the individual cell and the busbar no longer rely solely on adhesive to achieve structural / electrical connection, the electrical and structural connection strength between each individual cell and the busbar in the battery pack is improved. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below, forming part of the present invention. The illustrative embodiments of the present invention and their descriptions explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 This is a schematic diagram of the adhesive nail connection structure in a preferred embodiment of Embodiment 1 of the present invention;

[0037] Figure 2 This is a top view of the glued nail connection structure in a preferred embodiment of Embodiment 1 of the present invention;

[0038] Figure 3 for Figure 2 AA cross-section view;

[0039] Figure 4 This is a schematic diagram of the structure of the fastener adhesive layer and the adhesive nail portion in a preferred embodiment of Embodiment 1 of the present invention;

[0040] Figure 5 for Figure 4 A magnified view of a portion of the image;

[0041] Figure 6 for Figure 4 Cross-sectional view;

[0042] Figure 7 for Figure 6 A magnified view of a portion of the image;

[0043] Figure 8 This is a schematic diagram of the adhesive nail connection structure in a preferred embodiment of Embodiment 5 of the present invention;

[0044] Figure 9 for Figure 8 Cross-sectional view;

[0045] Figure 10 This is a schematic diagram of the adhesive nail connection structure in a preferred embodiment of Embodiment 5 of the present invention;

[0046] Figure 11 for Figure 10 Cross-sectional view;

[0047] Figure 12 This is a schematic diagram of the adhesive nail connection structure in a preferred embodiment of Embodiment 6 of the present invention;

[0048] Figure 13 for Figure 12 Cross-sectional view;

[0049] Figure 14 This is a schematic diagram of the adhesive nail connection structure in a preferred embodiment of Embodiment 6 of the present invention;

[0050] Figure 15 for Figure 14 Cross-sectional view;

[0051] Figure 16 This is a schematic diagram of the adhesive nail connection structure in a preferred embodiment of Embodiment 6 of the present invention;

[0052] Figure 17 for Figure 16 Cross-sectional view;

[0053] Figure 18 This is a schematic diagram of the adhesive nail connection structure in a preferred embodiment of Embodiment 6 of the present invention;

[0054] Figure 19 for Figure 18 Cross-sectional view;

[0055] Figure 20 This is a schematic diagram of the adhesive nail connection structure in a preferred embodiment of Embodiment 6 of the present invention;

[0056] Figure 21 for Figure 20 Cross-sectional view;

[0057] Figure 22 This is a schematic diagram of the adhesive nail connection structure in a preferred embodiment of Embodiment 6 of the present invention;

[0058] Figure 23 for Figure 22 Cross-sectional view;

[0059] Figure 24 This is a schematic diagram of the adhesive nail connection structure in a preferred embodiment of Embodiment 6 of the present invention;

[0060] Figure 25 for Figure 24 Cross-sectional view.

[0061] Explanation of reference numerals in the attached figures:

[0062] A single cell 100, a top terminal post 110, a side shell 120; a fixing component 200, an opening 210, a fixing component adhesive layer 220; an adhesive nail part 300, a nail body 310, an inner core part 320, a top dispersion part 321, a middle dispersion part 322, a bottom dispersion part 323, a nail head 330, a nail root 340, a convex ring part 350, a fiber 360, a columnar body 370, a tubular part 380, an ultraviolet scattering structure 390; a first conductor 400, a first opening 410; a second conductor 500, a second opening 510; and a conductive adhesive layer 600. Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. In the description of this invention, it should be noted that the term "or" is generally used to include the meaning of "and / or," unless otherwise expressly indicated.

[0064] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0065] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0066] Example 1

[0067] refer to Figures 1-7 This invention provides a glue-nail connection structure applicable to the top of a battery module or a single battery cell 100. This glue-nail connection structure can simultaneously connect the sheet-like fastener 200 and the side shell 120 of the single battery cell 100, converting the peel resistance of the structural adhesive between the fastener 200 and the top of the single battery cell 100 into the longitudinal shear resistance provided by the glue-nail connection structure, thereby significantly improving the peel resistance of the fastener 200.

[0068] Preferably, the single cell 100 in this embodiment can be a single cylindrical cell, a single columnar square cell (such as a single square cell), a single polygonal prism cell (such as a single hexagonal prism cell), etc.; optionally, the single cell 100 can be selected from 18650 cells, 21700 cells, 46800 cells, etc., but is not limited to these.

[0069] In a preferred embodiment, the single battery cell 100 has a casing terminal and a top terminal 110. The casing terminal is disposed on the side casing 120 and the bottom casing, and the top terminal 110 is disposed in the center of the top cover. Those skilled in the art will understand that the top terminal 110 and the casing terminal are the two terminals of the single battery cell 100, respectively. Given that the shape / structure of different models of single batteries 100 may vary slightly, they will not be listed one by one in this embodiment.

[0070] In a preferred embodiment, the adhesive nail connection structure includes a fixing member 200 and adhesive nail portions 300. The fixing member 200 is sheet-shaped and can be fixed to the top of the single battery cell 100. The fixing member 200 has openings 210 that match the number and size of the adhesive nail portions 300. The adhesive nail portion 300 includes at least a nail body 310, which is generally columnar. The upper part of the nail body 310 is bonded to the inner wall of the opening 210 of the fixing member 200, and the lower part of the nail body 310 can be bonded to the side of the side shell 120 or the top terminal post 110 of the single battery cell 100. Preferably, the adhesive nail connection structure can be applied to the top of a battery pack or a single battery cell 100.

[0071] Optionally, the fastener 200 can be a conductor or a non-conductor. Those skilled in the art should understand that when the fastener 200 is a conductor, it can simultaneously achieve electrical connection and structural connection with the single cell 100. In this case, the adhesive pin 300 can connect the fastener 200 to the housing terminal post, or connect the fastener 200 to the top terminal post 110. When the fastener 200 is a non-conductor, it can at least achieve structural connection with the single cell 100.

[0072] In a preferred embodiment, the adhesive nail connection structure further includes a fastener adhesive layer 220, which is disposed at least in at least a portion of the lower surface of the fastener 200 for structural connection between the fastener 200 and the top of the single battery cell 100. Preferably, the fastener adhesive layer 220 is adapted to the shape of the top cover of the single battery cell 100.

[0073] refer to Figures 4-7 (The fastener 200 is not shown in the figure). In a preferred embodiment, the adhesive layer 220 of the fastener is made of the same structural adhesive as the adhesive nail part 300. After both are cured, they are combined into a whole.

[0074] Preferably, at least a portion of the fixing member 200 is a metal busbar, which is electrically connected to the top terminal 110 of the single cell 100; more preferably, the adhesive layer of the fixing member 200 between the busbar and the single cell 100 is a conductive adhesive layer, which is used to realize the electrical connection and structural connection between the busbar and the top terminal 110 of the single cell 100.

[0075] Those skilled in the art should understand that a busbar can realize series or parallel electrical connection between adjacent batteries, and multiple batteries can form a series battery bar, parallel battery bar, or battery pack through the busbar. Most busbars are sheet-shaped. Given that the structure of busbars from different manufacturers and models varies, and that their shape / size can be adjusted according to the shape / size of the individual battery 100, the specific structure can be freely customized, and will not be listed one by one in this embodiment.

[0076] In a preferred embodiment, the glued nail portion 300 is formed by curing structural adhesive.

[0077] Specifically, structural adhesive refers to an adhesive with high strength (compressive strength > 65 MPa, steel-to-steel tensile bond strength > 30 MPa, shear strength > 18 MPa), capable of withstanding large loads, and resistant to aging, fatigue, and corrosion. It exhibits stable performance throughout its expected lifespan and is suitable for bonding structural components subjected to high forces. Before curing, the structural adhesive is fluid. It is placed in the opening 210 of the fastener 200 and allowed to flow axially onto the side shell 120 of the individual battery 100. After curing, it forms the adhesive nail portion 300, thus achieving a stable structural connection between the fastener 200 and the individual battery 100.

[0078] Preferably, the structural adhesive is a UV-curable adhesive; those skilled in the art should understand that the UV-curable adhesive is mainly composed of a photoinitiator (photosensitizer), an active diluent, and a prepolymer; UV curing refers to the process by which the photoinitiator in the structural adhesive rapidly decomposes into free radicals or cations under UV light of appropriate wavelength and intensity, thereby initiating the polymerization of unsaturated bonds and curing the material.

[0079] Preferably, in order to ensure that the UV-curable adhesive can cure evenly and quickly, at least a portion of the fastener 200 is made of a material that can transmit ultraviolet light, preferably a transparent material.

[0080] In a preferred embodiment, the adhesive nail portion 300 is further provided with a nail head 330, making the entire adhesive nail portion 300 nail-shaped; the size of the nail head 330 is larger than the size of the opening 210 and is located above the opening 210; preferably, the nail head 330 can simultaneously provide longitudinal peel resistance and further provide transverse shear resistance, making the structural connection between the entire adhesive nail portion 300, the fastener 200, and the single battery cell 100 more stable. Preferably, the material of the nail head 330 is a fast-drying material, such as polyurea.

[0081] In a preferred embodiment, the top of the opening 210 is also provided with a larger countersunk hole, the size of which is adapted to the size of the nail head 330, so that the nail head 330 can be placed in the countersunk hole, so that the top of the fastener 200 remains a flat plane, which is conducive to the longitudinal stacking of multiple single cells 100 or battery packs with glue nail connection structure.

[0082] Example 2

[0083] This embodiment provides a glued nail connection structure, including a fastener 200 and a glued nail portion 300. The features of the fastener 200 and the glued nail portion 300 already included in Embodiment 1 are naturally inherited in this embodiment.

[0084] In a preferred embodiment, regardless of whether the glued nail portion 300 is provided with a nail head 330, it is provided with an inner core portion 320 that extends vertically through its central axis (for the specific structure of the inner core portion 320, please refer to Embodiment 6 and its appendix below). Figures 12-19 Preferably, the inner core 320 extends through the interior of the nail body 310, while the exterior of the nail body 310 has a straight line feature.

[0085] Preferably, the inner core 320 has a lower elastic modulus in the longitudinal direction than the nail body 310, so as to improve the longitudinal tensile strength of the glued nail part 300; at this time, the inner core 320 is equivalent to the skeleton of the nail body 310, and has higher structural strength.

[0086] Preferably, the inner core 320 can be selected from one or more of the following: metal wire, glass fiber wire, carbon fiber wire, single or multi-strand cord, tubular portion 380, and columnar body 370.

[0087] Those skilled in the art should understand that when the inner core 320 is made of metal wire, glass fiber wire, carbon fiber wire, single strand or multi strand of cord, these materials are fused and sealed in structural adhesive. After the structural adhesive cures, an integrated structure is formed. At this time, the inner core 320 can be understood as both the above-mentioned materials and the structural adhesive that encapsulates the above-mentioned materials. Furthermore, when the structural adhesive encapsulates the above-mentioned materials, the structure of the inner core 320 is similar to that of concrete or tempered glass.

[0088] In a preferred embodiment, when the inner core 320 is selected as either a tubular portion 380 or a columnar portion 370, the inner core 320 is made of a material capable of conducting ultraviolet light to ensure that the structural adhesive can be uniformly irradiated by ultraviolet light and fully cured; more preferably, the refractive index of the inner core 320 is less than the refractive index of the structural adhesive.

[0089] In a preferred embodiment, when the inner core 320 is a columnar body 370, an ultraviolet scattering structure 390 is also provided. When ultraviolet light is used to irradiate the nail body 310, the ultraviolet scattering structure 390 can scatter the incident ultraviolet light radially outward so that more ultraviolet light can irradiate the nail body 310 outside the inner core 320, thus ensuring the curing efficiency.

[0090] Those skilled in the art should understand that when the inner core 320 is selected as a columnar body 370, it has higher structural strength; when the inner core 320 is selected as a tubular part 380, although the structural strength is slightly weaker, more ultraviolet light can be irradiated to the nail body 310 on the outside of the inner core 320 to ensure curing efficiency. At the same time, the inner core 320 with the tubular part 380 structure can also make the entire glue nail connection structure, and even the entire battery module, lighter in weight, which is convenient for production and application.

[0091] Example 3

[0092] This embodiment provides a battery pack, including a plurality of individual cells 100 and a glue nail connection structure. The features of the glue nail connection structure already included in Embodiments 1 and 2 are naturally inherited in this embodiment.

[0093] Preferably, multiple individual battery cells 100 are arranged in the same direction and in an array to form a battery array; at least one fixing member 200 is provided above the battery array, and at least some of the individual battery cells 100 in the battery array are structurally connected to the fixing member 200 via the adhesive pin portion 300 in Embodiment 1 or Embodiment 2.

[0094] Preferably, the battery array can be 4×4, 6×6, 8×8, etc.

[0095] Optionally, in this embodiment, the fastener 200 may be a conductor or a non-conductor.

[0096] In a preferred embodiment, at least a portion of the fixing member 200 is a busbar, and the individual cells 100 in the battery array are connected in series or in parallel through the fixing member 200; preferably, a conductive adhesive layer 600 is also provided between the fixing member 200 and the top terminal 110 of the individual cell 100.

[0097] In another preferred embodiment, the fixing member 200 is a non-conductor. In this case, adjacent individual cells 100 in the battery array are connected in series or in parallel through additional electrical connectors. There is only a structural connection between the fixing member 200 and the individual cells 100.

[0098] Preferably, multiple adhesive nails 300 can be provided around each individual battery cell 100; more preferably, an adhesive nail 300 is provided on each side of the tangent point of two adjacent individual batteries cell 100. At this time, the nail body 310 of the adhesive nail 300 connects the side shell 120 and the fastener 200 of the two adjacent individual batteries cell 100 to achieve a tight structural connection between adjacent individual batteries cell 100.

[0099] Example 4

[0100] In this embodiment, a method for preparing a battery pack is provided for preparing the battery pack in Embodiment 3 above.

[0101] In a preferred embodiment, the method for manufacturing the battery pack includes the following steps:

[0102] S100. Arrange multiple individual cells 100 in an array to form a battery array;

[0103] S200. The fastener 200 is positioned on top of the battery array;

[0104] Preferably, the method further includes the following steps before step S200:

[0105] S210. A planar adhesive layer is provided on the top of the single cell 100, and the planar adhesive layer is a UV-curable adhesive;

[0106] S220. Place the fastener 200 on the flat adhesive layer;

[0107] S230. During the formation of the adhesive column, the adhesive column is bonded to the planar adhesive layer, and the structural adhesive layer is cured simultaneously during the UV curing process;

[0108] S300. Insert the injection head into the pre-set lower position of the nail body 310 in the opening 210, and lift the injection head while injecting structural adhesive to form an adhesive column; preferably, the structural adhesive is a UV-curable adhesive;

[0109] S400. When the dispensing head is raised to the position of the opening 210, the dispensing head stops briefly or slows down its upward movement, and then stops dispensing.

[0110] S500. The adhesive column adheres to the inner wall of the opening 210 and the side casing 120 of at least one single cell 100, and an adhesive pile is formed at the location of the opening 210.

[0111] S600. UV curing: UV light is used to irradiate the glue column and glue pile to cure them and form the glue nail part 300.

[0112] Preferably, before step S600, the method further includes:

[0113] S610. Two different frequency bands of ultraviolet light are used for overall stepped irradiation to cure the deep colloid and the surface colloid respectively, forming an integral and complete curing of the glue nail part 300 and the planar glue layer.

[0114] Example 5

[0115] refer to Figures 8-13 This embodiment provides a glued connection structure that can be applied to the top of a battery module or a single battery cell 100. The glued connection structure includes a first conductor 400, a second conductor 500, and a glued part 300. The second conductor 500 is electrically connected to the top terminal post 110 of the single battery cell 100. The first conductor 400 and the second conductor 500 are stacked in parallel. The glued structure can connect the first conductor 400 and the second conductor 500 at the same time, so that the original anti-peel force between them is converted into longitudinal anti-shear force, which significantly enhances the anti-peel ability between the first conductor 400 and the second conductor 500.

[0116] In the existing technology, when two conductors are in sheet or plate shape, adhesive bonding is generally used to achieve a crimped electrical connection between them. However, this method has low peel resistance and the two are prone to separation in the longitudinal direction.

[0117] In a preferred embodiment, the adhesive nail connection structure includes a first conductor 400, a second conductor 500, and at least one adhesive nail portion 300. Preferably, both the first conductor 400 and the second conductor 500 are flat and stacked parallel to each other. Preferably, the first conductor 400 has at least one first opening 410, which is a through hole; the second conductor 500 has a second opening 510, the position of which corresponds to the position of the first opening 410; the adhesive nail portion 300 includes at least a nail body 310, which is generally columnar, with the upper part of the nail body 310 bonded to the inner wall of the first opening 410 and the lower part of the nail body 310 bonded to the inner wall of the second opening 510. Preferably, the adhesive nail portion 300 is formed by curing structural adhesive.

[0118] In a preferred embodiment, the first conductor 400 is a bus, or the first conductor 400 is a portion of the bus.

[0119] In a preferred embodiment, the second conductor 500 is disposed at the top terminal 110 of the single cell 100, or the second conductor 500 is part of the top terminal 110 of the single cell 100 (such as the top terminal 110 of some 46800 batteries).

[0120] Preferably, a conductive adhesive layer 600 is disposed between the first conductor 400 and the second conductor 500, in at least a portion of the gap region adjacent to the first opening 410 and the second opening 510. The conductive adhesive layer 600 can electrically connect the first conductor 400 and the second conductor 500. Those skilled in the art should understand that when only the first conductor 400, the second conductor 500, and the conductive adhesive layer 600 between them exist, there is only a small longitudinal peel resistance between the first conductor 400 and the second conductor 500, while the transverse shear resistance is almost non-existent. Only when the adhesive pin portion 300 is disposed in the first opening 410 and the second opening 510 can a vertical shear resistance be provided, and this shear resistance is much greater than the peel resistance provided by the conductive adhesive layer 600 between the first conductor 400 and the second conductor 500, so that a tight structural connection and electrical connection can be achieved between the first conductor 400 and the second conductor 500.

[0121] In a preferred embodiment, the glued nail portion 300 is cured with structural adhesive; preferably, the structural adhesive is a UV-curable adhesive. Specifically, the specific configuration of the UV-curable adhesive in this embodiment is the same as in Embodiment 1 above, and will not be repeated here.

[0122] In a preferred embodiment, the adhesive nail portion 300 further includes a nail head 330 and / or a nail root 340, such as Figure 10 , Figure 11 .

[0123] Preferably, the nail head 330 is disposed at the top of the nail body 310, making the upper part of the entire nail body 310 nail-shaped; the size of the nail head 330 is larger than the size of the first opening 410 and is located at the upper end of the first opening 410; preferably, the nail head 330 can provide longitudinal anti-peeling force and further provide transverse anti-shearing force, making the structural connection between the entire glued nail part 300 and the first conductor 400 and the second conductor 500 more stable.

[0124] In a preferred embodiment, the upper end of the first opening 410 is also provided with a larger countersunk hole, the size of which is adapted to the size of the nail head 330, so that the nail head 330 can be placed in the countersunk hole, so that the upper surface of the first conductor 400 remains a flat plane, which is conducive to the longitudinal stacking of multiple single cells 100 or battery packs with glue nail connection structure.

[0125] Preferably, the nail root 340 is located at the bottom end of the nail body 310, so that the lower part of the entire nail body 310 is also nail-shaped; preferably, the size of the nail root 340 is larger than the size of the second opening 510 and is located at the lower end of the second opening 510; preferably, the nail head 330 can provide longitudinal anti-peeling force and further provide transverse anti-shearing force, so that the structural connection between the entire glued nail part 300 and the first conductor 400 and the second conductor 500 is more stable.

[0126] In a preferred embodiment, the lower end of the second opening 510 is further provided with a larger countersunk hole, the size of which is adapted to the size of the nail root 340, so that the nail root 340 can be disposed in the countersunk hole.

[0127] In a preferred embodiment, the middle portion of the adhesive pin portion 300 further includes a protruding ring portion 350, which is embedded in the gap between the first conductor 400 and the second conductor 500, such as... Figure 12 , Figure 13 .

[0128] Preferably, the lower end of the first opening 410 and the upper end of the second opening 510 are both provided with flared openings, and the glue nail portion 300 extends radially outward from its middle part into the flared opening to form a convex ring portion 350.

[0129] Preferably, the protruding ring portion 350 can further provide the first conductor 400 and the second conductor 500 with longitudinal peel resistance, thereby improving the shear resistance and peel resistance between them, enhancing the structural strength of the structural connection between them, and ensuring the stability of the connection between them.

[0130] Example 6

[0131] refer to Figures 12-25This embodiment provides a glued nail connection structure, including a first conductor 400, a second conductor 500 and a glued nail portion 300. The features of the first conductor 400 and the second conductor 500 already included in Embodiment 5 are naturally inherited in this embodiment.

[0132] In a preferred embodiment, regardless of whether the glued nail portion 300 is provided with a nail head 330 / nail root 340, it is provided with an inner core portion 320 extending vertically through its central axis; preferably, the inner core portion 320 extends through the interior of the nail body 310, while the exterior of the nail body 310 has a straight line feature, such as... Figure 12 .

[0133] Preferably, the inner core 320 has a lower elastic modulus in the longitudinal direction than the nail body 310, so as to improve the longitudinal tensile strength of the glued nail part 300; at this time, the inner core 320 is equivalent to the skeleton of the nail body 310, and has higher structural strength.

[0134] Preferably, the inner core 320 includes several filaments 360, and the material of the filaments 360 can be selected from one or more of the following: metal wire, glass fiber wire, carbon fiber wire, single or multi-strand cord, tubular portion 380, and columnar body 370.

[0135] refer to Figure 18 , Figure 19 Those skilled in the art should understand that when the inner core 320 is made of metal wire, glass fiber wire, carbon fiber wire, single strand or multi strand of wire, these materials are fused and sealed in structural adhesive. After the structural adhesive cures, an integrated structure is formed. At this time, the inner core 320 can be understood as the above-mentioned materials and the structural adhesive that wraps the above-mentioned materials. Furthermore, when the structural adhesive wraps the above-mentioned materials, the structure of the inner core 320 is similar to a structure such as concrete or tempered glass.

[0136] like Figures 12-17 In a preferred embodiment, when the inner core 320 is selected as either a tubular portion 380 or a columnar portion 370, the inner core 320 is made of a material capable of conducting ultraviolet light to ensure that the structural adhesive can be uniformly irradiated by ultraviolet light and fully cured; more preferably, the refractive index of the inner core 320 is less than the refractive index of the structural adhesive.

[0137] Those skilled in the art should understand that when the inner core 320 is selected as a columnar body 370, it has higher structural strength; when the inner core 320 is selected as a tubular part 380, although the structural strength is slightly weaker, more ultraviolet light can be irradiated to the nail body 310 on the outside of the inner core 320 to ensure curing efficiency. At the same time, the inner core 320 with the tubular part 380 structure can also make the entire glue nail connection structure, and even the entire battery module, lighter in weight, which is convenient for production and application.

[0138] In a preferred embodiment, when the staple portion 300 is provided with a staple head 330, a staple root 340, or a raised ring, the inner core portion 320 is further provided with a dispersion portion; preferably, the inner core portion 320 includes a top dispersion portion 321 located at the top of the staple portion 300, more preferably, the top dispersion portion 321 is disposed in the staple head 330; and / or, the inner core portion 320 includes a bottom dispersion portion 323 located at the bottom of the staple portion 300, more preferably, the bottom dispersion portion 323 is disposed in the staple root 340, such as... Figure 20 , Figure 21 More preferably, the inner core 320 includes a centrally distributed portion 322 located in the middle of the adhesive pin portion 300; more preferably, the end of the centrally distributed portion 322 extends and is disposed in the convex ring portion 350, such as... Figure 22 , Figure 23 .

[0139] In a preferred embodiment, the dispersion portion is formed by the outward radial dispersion of the upper and lower ends of the filament 360, which can be regarded as an extension of the inner core portion 320 to the nail head 330 / nail root 340 / protruding ring portion 350, and is used to provide higher structural strength for the nail head 330 / nail root 340 / protruding ring portion 350, and can play a locking role in the radial direction to ensure that the first conductor 400 and the second conductor 500 can be connected more firmly.

[0140] Preferably, the filaments 360 are bent and dispersed in all directions within the nail head 330 and / or nail root 340 and / or convex ring portion 350. The bent filaments 360 can provide a larger contact area with the structural adhesive to improve the structural strength of the dispersed portion.

[0141] Preferably, the ends of the filaments 360 are connected within the nail head 330 and / or nail root 340, so that the filaments 360 become a whole, further improving the structural strength of the dispersion portion.

[0142] refer to Figure 24 , Figure 25 In another preferred embodiment, the dispersion portion is formed by the upper and lower ends of the tubular portion 380 or the columnar body 370 being radially dispersed outwards. It can also be regarded as an extension of the inner core portion 320 to the nail head 330 / nail root 340 / protruding ring portion 350, which is used to provide higher structural strength for the nail head 330 / nail root 340 / protruding ring portion 350.

[0143] Preferably, when the dispersion part is a fiber 360, the glued nail part 300 needs to be cured in sections. For example, the bottom dispersion part 323 and nail root 340 are first cured with ultraviolet light, then the fiber 360 is straightened to cure the lower part of the nail body 310 and the convex ring part 350, and then the fiber 360 is straightened again to cure the top dispersion part 321 and nail head 330.

[0144] like Figure 16 , Figure 17In a preferred embodiment, when the inner core 320 is a columnar body 370, an ultraviolet scattering structure 390 is also provided. When ultraviolet light is used to irradiate the nail body 310, the ultraviolet scattering structure 390 can scatter the ultraviolet light incident from both ends of the glue nail part 300 radially outward, so that more ultraviolet light can irradiate the nail body 310 outside the inner core 320, ensuring the curing efficiency.

[0145] More preferably, when the nail body 310 has a raised ring portion 350 in the middle, ultraviolet light is not easy to penetrate, resulting in poor or uneven curing. Therefore, preferably, the ultraviolet scattering structure 390 is at least one annular refractive surface, and the annular refractive surface corresponds to the position of the raised ring portion 350, so as to better refract ultraviolet light into the raised ring portion 350 and ensure its uniform curing.

[0146] Example 7

[0147] This embodiment provides a battery pack, including a plurality of individual cells 100 and a glue nail connection structure. The features of the glue nail connection structure already included in Embodiments 5 and 6 are naturally inherited in this embodiment.

[0148] Preferably, multiple individual cells 100 are arranged in the same direction and in an array to form a battery array; preferably, the top terminal 110 of the individual cell 100 has a second conductor 500; at least one busbar is provided above the battery array, and the busbar includes multiple first conductors 400; through the adhesive pin portion 300 in the above embodiment 5 or embodiment 6, at least some of the individual cells 100 in the battery array are connected and electrically connected to the busbar structure.

[0149] In a preferred embodiment, the individual cells 100 in the battery array are connected in series or in parallel via a busbar.

[0150] Preferably, multiple adhesive nails 300 can be provided around each individual battery cell 100; more preferably, an adhesive nail 300 is provided on each side of the tangent point of two adjacent individual batteries 100. At this time, the nail body 310 of the adhesive nail 300 connects the top terminal post 110 and the first conductor 400 of the two adjacent individual batteries 100 at the same time, so as to achieve a tight structural connection between adjacent individual batteries 100.

[0151] Specifically, the battery pack preparation method in this embodiment is described in Example 4 above, and will not be repeated here.

[0152] Example 8

[0153] This embodiment provides an electrical connection assembly, including a plurality of individual battery cells 100 and a glue nail connection structure. The features of the glue nail connection structure already included in Embodiments 5 and 6 are naturally inherited in this embodiment.

[0154] In a preferred embodiment, a first conductor 400 and a second conductor 500 are provided, and the busbar is electrically connected to the top terminal 110 of the single cell 100 and structurally connected using the adhesive nail connection structure in Embodiment 5 or Embodiment 6.

[0155] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other modifications under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these modifications are within the protection scope of the present invention.

Claims

1. A glue-pin connection structure for battery modules, characterized in that, include: A fastener for securing to the top of a single battery cell, the fastener having an opening; The adhesive nail part includes a nail body formed by curing structural adhesive. After curing, the adhesive nail part is generally columnar. The upper part of the nail body is located in the opening and is bonded to the inner wall of the opening. The lower part of the nail body can be bonded to the side shell of the single battery cell.

2. The adhesive nail connection structure according to claim 1, characterized in that, The nail part also includes a nail head, which is disposed at the top of the nail body and integrally formed with the nail body; the nail head is disposed above the opening or in a countersunk hole within the opening, and has a size larger than the opening.

3. The adhesive nail connection structure according to claim 2, characterized in that, The structural adhesive is a UV-curable adhesive.

4. The adhesive nail connection structure according to claim 2, characterized in that, The adhesive nail portion has an inner core portion that extends at least through the interior of the nail body, and the exterior of the adhesive nail portion has a straight line feature.

5. The adhesive nail connection structure according to claim 4, characterized in that, The inner core has a lower elastic modulus in the longitudinal direction than the nail body, which is used to improve the longitudinal tensile strength of the glued nail.

6. The adhesive nail connection structure according to claim 4, characterized in that, The inner core includes one or more of the following: metal wire, glass fiber wire, carbon fiber wire, single or multi-strand cord, and columnar body.

7. The adhesive nail connection structure according to claim 4, characterized in that, The inner core is made of a material that can conduct ultraviolet light.

8. The adhesive nail connection structure according to claim 7, characterized in that, The refractive index of the inner core is less than or equal to the refractive index of the structural adhesive.

9. The adhesive nail connection structure according to claim 4, characterized in that, The inner core has an ultraviolet scattering structure.

10. The adhesive nail connection structure according to any one of claims 1-9, characterized in that, The fastener is made of a material that can transmit ultraviolet light.

11. The adhesive nail connection structure according to any one of claims 1-9, characterized in that, It also includes a fastener adhesive layer, which is disposed on at least a portion of the lower surface of the fastener for structural connection between the fastener and the top of the individual battery cell.

12. The adhesive nail connection structure according to claim 11, characterized in that, The fastener includes a busbar; the adhesive layer of the fastener includes a conductive adhesive layer for electrical and structural connection between the busbar and the top terminal post of the individual battery cell.

13. A battery pack, characterized in that, include: Multiple individual cells arranged in an array; At least one fastener is disposed on top of a plurality of individual cells arranged in an array; The single cell battery is connected to the fixing structure using the adhesive nail connection structure according to any one of claims 1-12.

14. A method for preparing a battery pack according to claim 13, characterized in that, include: Multiple individual battery cells are arranged in an array to form a battery array; The fastener is mounted on top of the battery array; Insert the injection head into the pre-set position at the lower end of the nail body in the opening, and lift the injection head while injecting structural adhesive to form an adhesive column; the structural adhesive is a UV-curing adhesive; When the dispensing head is raised to the opening position, the dispensing head stops briefly or slows down its upward movement, and then stops dispensing. This causes the adhesive column to adhere to the inner sidewall of the opening and the side casing of at least one of the individual cells, forming an adhesive pile at the opening location; Ultraviolet curing involves irradiating the adhesive column and the adhesive pile with ultraviolet light to cure them and form the adhesive nail part.

15. The preparation method according to claim 14, characterized in that, Prior to the step of mounting the fastener on top of the battery array, the method further includes: A planar adhesive layer is provided on the top of the individual battery cell, and the planar adhesive layer is a UV-curable adhesive. The fastener is disposed on the planar adhesive layer; During the formation of the adhesive column, the adhesive column is bonded to the planar adhesive layer, and the structural adhesive is simultaneously cured during the ultraviolet curing process.

16. The preparation method according to claim 15, characterized in that, In the UV curing step, two different frequency bands of UV light are used for overall stepped irradiation to cure the deep colloid and the surface colloid respectively, forming an integral and complete curing of the glue nail part and the planar glue layer.

17. A battery pack, characterized in that, include: At least one bus, the bus comprising a plurality of first conductors; Multiple individual cells arranged in an array, wherein the top terminal of each individual cell has a second conductor; A glue-nail connection structure is used to electrically and structurally connect the busbar to the top terminal of the individual battery. The glue-nail connection structure includes a first conductor, a second conductor, and at least one glue-nail portion. The first conductor has a first opening, which is a through hole; The second conductor has a second opening, which corresponds to the position of the first opening; the first conductor and the second conductor are stacked parallel to each other. Conductive adhesive is disposed in at least a portion of the gap region between the first conductor and the second conductor, adjacent to the first opening and the second opening, and the conductive adhesive electrically connects the first conductor and the second conductor; The adhesive nail portion includes a nail body formed by curing structural adhesive, and the adhesive nail portion is generally columnar after the structural adhesive has cured; the adhesive nail portion is disposed in the first opening and the second opening, and is bonded to the inner wall of the first opening and the second opening.

18. The battery pack according to claim 17, characterized in that, The structural adhesive is a UV-curable adhesive.

19. The battery pack according to claim 17, characterized in that, The adhesive nail part also includes a nail head disposed at the top of the nail body. The nail head is disposed in the first opening located on the upper surface of the first conductor, or in the countersunk hole within the first opening, and the nail head has a size larger than the first opening and / or the second opening. And / or, the adhesive nail portion further includes a nail root disposed at the bottom end of the nail body, the nail root being disposed below the second opening or in a countersunk hole within the second opening, and the nail root having a size larger than the second opening in the planar direction.

20. The battery pack according to claim 17, characterized in that, The middle part of the adhesive nail also includes a convex ring portion, which is embedded in the gap between the first conductor and the second conductor.

21. The battery pack according to any one of claims 17-20, characterized in that, The adhesive nail portion has an inner core that extends at least through the nail body.

22. The battery pack according to claim 21, characterized in that, The inner core has a lower elastic modulus than the nail body, which is used to improve the longitudinal tensile strength of the glued nail portion.

23. The battery pack according to claim 21, characterized in that, The inner core includes a top dispersion portion located at the top of the adhesive nail portion; And / or, the inner core includes a bottom dispersion portion located at the bottom end of the adhesive pin portion; And / or, the inner core includes a centrally distributed portion located in the middle of the adhesive nail portion.

24. The battery pack according to claim 23, characterized in that, The top dispersion portion is disposed in the nail head; And / or, the bottom dispersion portion is disposed in the nail root; And / or, the end of the middle portion extends into the convex ring.

25. The battery pack according to claim 21, characterized in that, The inner core includes multiple filaments, which include one or more of the following: metal wire, glass fiber wire, carbon fiber wire, single strand or multi strand cord; Alternatively, the inner core may include a hollow tubular portion made of a material that is transparent to ultraviolet light; Alternatively, the inner core may include a column made of a material capable of transmitting ultraviolet light.

26. The battery pack according to claim 25, characterized in that, The filaments bend within the nail head and / or the nail root and disperse in all directions; And / or, the filament ends are connected within the nail head and / or the nail root.

27. The battery pack according to claim 25, characterized in that, The refractive index of the column is less than or equal to the refractive index of the structural adhesive.

28. The battery pack according to claim 21, characterized in that, The inner core has an ultraviolet scattering structure that can scatter ultraviolet rays incident from both ends of the adhesive nail into the nail body.

29. The battery pack according to claim 21, characterized in that, The inner core has an ultraviolet refractive structure, which includes at least one annular refractive surface that can refract ultraviolet light into the interior of the nail body.

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