Battery module

Abstract

The utility model provides a battery module. The battery module comprises a battery cell assembly, a foam assembly, an FPC (Flexible Printed Circuit) assembly, an end plate assembly, an upper cover assembly and heat-conducting glue, the end plate assemblies are adhered to the two opposite ends of the battery cell assembly in the first direction, and the FPC assemblies are arranged on the two opposite sides of the battery cell assembly in the second direction; one side of the foam assembly is adhered to the battery cell assembly, and the other side of the foam assembly can support the FPC assembly; a part of the FPC assembly is welded to at least a part of the battery cell assembly, and at least a part of the FPC assembly is clamped to at least a part of the foam assembly; the upper cover assembly is adhered to the top of the battery cell assembly in the third direction through heat-conducting glue, so that the upper cover assembly and the battery cell assembly form an integrated structure; the first direction, the second direction and the third direction are mutually orthogonal. The battery module has the advantages of simple and reliable structure, few parts, simple assembly process and high grouping efficiency, so that the battery module can achieve the purpose of reducing the cost.

Description

A battery module Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, and in particular to a battery module. Background Technology

[0002] Due to their advantages of high capacity, light weight, high safety and long cycle life, pouch batteries have been widely used in various fields such as automotive power batteries and portable energy storage devices, which has led to pouch batteries gradually replacing hard-pack batteries.

[0003] Existing pouch battery modules consist of multiple pouch cells, inter-cell foam, a plastic support structure, busbars, end plates, side plates, a cover plate, a base plate, a fire-resistant and heat-insulating layer, a sampling plate, and sealing or potting compound. The busbars are fixed to the plastic support structure. After the foam is stacked between the pouch cells, the cell tabs are bent and passed through the plastic support structure, thus welding the cell tabs to the busbars. The sampling plate is welded to the busbars. The end plates, side plates, cover plates, and base plate are then laser-welded together after being wrapped externally. Sealing or potting compound is then filled into the gaps between the cell tabs and the end plates through injection holes. While the existing battery module design meets basic functional requirements, its complex structure and cumbersome assembly process present numerous challenges. Therefore, simplifying the structure, optimizing the assembly process, improving assembly efficiency, and reducing costs have become important directions for current battery module design improvements. Summary of the Invention

[0004] The battery module provided by this utility model aims to solve at least some of the defects of existing battery modules.

[0005] This utility model provides a battery module. The battery module includes:

[0006] Battery cell assembly, foam assembly, FPC assembly, end plate assembly, top cover assembly, and thermally conductive adhesive;

[0007] The end plate assembly is attached to both opposite ends of the cell assembly in a first direction, and the FPC assembly is disposed on both opposite sides of the cell assembly in a second direction;

[0008] One side of the foam assembly is attached to the cell assembly, and the other side of the foam assembly can support the FPC assembly;

[0009] A portion of the FPC assembly is soldered to at least a portion of the cell assembly, and at least a portion of the FPC assembly is snapped to at least a portion of the foam assembly;

[0010] The top cover assembly is attached to the top of the battery cell assembly in a third-direction orientation using the thermally conductive adhesive, so that the top cover assembly and the battery cell assembly form an integral structure.

[0011] The first direction, the second direction, and the third direction are orthogonal to each other.

[0012] In some embodiments, the cell assembly includes:

[0013] End plate foam, N battery cell bodies and N-1 battery cell large surface foam, where N is a positive integer not less than 5;

[0014] A large-area foam is provided between two adjacent cell bodies, and the end plate foam is attached to the outer side of the cell body closest to the end plate assembly among N cell bodies.

[0015] In some embodiments, each of the battery cell bodies is provided with a positive electrode tab and a negative electrode tab, wherein the positive electrode tab is connected to the positive terminal of the battery cell body, and the negative electrode tab is connected to the negative terminal of the battery cell body.

[0016] In two adjacent battery cell bodies, the positive electrode tab of one battery cell body is bent at 90° to the negative electrode tab of the other battery cell body to form an overlapping double-layer structure.

[0017] The overlapping double-layer structure can be welded into one piece, forming an electrode lug weld at the welding position.

[0018] In some embodiments, the foam assembly includes:

[0019] The foam body includes a first body, a second body, and a third body, and the foam body is Z-shaped.

[0020] One end of the second body is connected to the first body, and the other end of the second body is connected to the third body;

[0021] The side of the third body that faces away from the second body can support the overlapping double-layer structure.

[0022] In some embodiments, an aluminum-plastic film is disposed on the battery cell body, and the foam assembly further includes:

[0023] Adhesive backing layer; the adhesive backing layer is located on the side of the second body away from the third body, and the foam body is bonded to the aluminum-plastic film through the adhesive backing layer;

[0024] A partial PC sheet; the partial PC sheet has a first snap-fit ​​hole, and the third body has a second snap-fit ​​hole on the side opposite to the second body;

[0025] The partial PC sheet is attached to the side of the third body away from the second body, at which time the first snap-fit ​​hole and the second snap-fit ​​hole are coaxial.

[0026] In some embodiments, the FPC component includes:

[0027] FPC body, voltage acquisition terminals, female and male snap fasteners, connectors and a pair of NTC acquisition terminals;

[0028] A pair of NTC acquisition terminals are symmetrically arranged at opposite ends of the FPC body in its length direction, and the end of each NTC acquisition terminal away from the FPC body can be attached to the aluminum-plastic film surface of the battery cell body;

[0029] The FPC body has an upper and a lower portion opposite each other in its width direction, and the voltage acquisition terminal is disposed in the lower portion of the FPC body;

[0030] The upper part of the FPC body is provided with a snap-fit ​​part, and the snap-fit ​​part corresponds to the first snap-fit ​​hole and / or the second snap-fit ​​hole;

[0031] At least a portion of the snap fastener extends through the snap-fit ​​portion to the first snap-fit ​​hole, so that the FPC body snaps onto the portion of the PC sheet;

[0032] The connector is disposed at the end of the FPC body in its length direction, and the voltage acquisition terminal is welded to the overlapping double-layer structure as a whole.

[0033] When the FPC body is attached to the partial PC chip, the length direction of the FPC body is parallel to the first direction, and the width direction of the FPC body is parallel to the third direction.

[0034] In some embodiments, the FPC body includes:

[0035] M substrates and M-1 arched structures, where M is a positive integer not less than 2;

[0036] An arched structure is provided between two adjacent substrates, and the substrates and the arched structure are integrally formed.

[0037] In some embodiments, the N cell bodies are arranged in an orderly manner along the first direction according to a preset pattern, and the first cell body and the Nth cell body are used as end cells.

[0038] The large-area foam of the battery cell and the end plate foam are both bonded to the battery cell body as an integral structure, and both the large-area foam of the battery cell and the end plate foam can provide pre-tightening force;

[0039] The end plate foam is disposed between the end cell and the end plate assembly.

[0040] In some embodiments, the endplate assembly includes:

[0041] End plate body and current guiding insert; one side of the end plate body faces the end cell, and the current guiding insert is disposed on the other side of the end plate body;

[0042] When the end plate assembly is attached to the two opposite ends of the cell assembly in the first direction, the end plate foam filling between the end cell and the end plate body can form the preload force.

[0043] In some embodiments, the cover assembly includes:

[0044] The cover body, insulating film, and adhesive-resistant foam are included; the insulating film is heat-pressed and bonded to the surface of the cover body in the third-party direction, facing the battery cell assembly.

[0045] The adhesive-blocking foam is disposed on both sides of the upper cover body in the second direction to enclose and form an adhesive-containing area;

[0046] When the top cover assembly is attached to the top of the cell assembly in a third-direction orientation using the thermally conductive adhesive, the adhesive-blocking foam can prevent the thermally conductive adhesive from overflowing into the adhesive-containing area.

[0047] At least one beneficial effect of the battery module provided by this utility model embodiment is that the battery module has the advantages of simple and reliable structure, few parts, simple assembly process and high assembly efficiency, thereby enabling the battery module to achieve the purpose of reducing costs. Attached Figure Description

[0048] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are designated as the same elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0049] Figure 1 is a schematic diagram of the battery module provided in this application;

[0050] Figure 2 is an exploded view of the battery module provided in this application;

[0051] Figure 3 shows a schematic diagram of the breakage of the electrode tab weld formed after the electrode tab is bent and welded according to the present application.

[0052] Figure 4 shows a schematic diagram of the side structure of the battery module provided in this application;

[0053] Figure 5 is a partial enlarged view of Figure 4 at point A provided in this application;

[0054] Figure 6 shows a schematic diagram of the structure of the FPC component in the battery module provided in this application.

[0055] Figure 7 is a structural schematic diagram of the end plate assembly provided in this application;

[0056] Figure 8 is an exploded view of the top cover assembly provided in this application.

[0057] Reference numerals: 100, Battery module; 1001, First direction; 1002, Second direction; 1003, Third direction; 1, Cell assembly; 11, Cell body; 12, Large-area cell foam; 13, End plate foam; 111, Cell tab; 1111, Overlapping double-layer structure; 1112, Tab weld; 2, Foam assembly; 21, Foam body; 22, Adhesive layer; 23, Partial PC sheet; 211, First body; 212, Second body; 213. Third body; 231, First snap-fit ​​hole; 2131, Second snap-fit ​​hole; 3, FPC assembly; 31, FPC body; 32, Voltage acquisition terminal; 33, Snap-fit; 34, Connector; 35, NTC acquisition terminal; 311, Substrate; 312, Arch structure; 3101, Snap-fit ​​part; 4, End plate assembly; 41, End plate body; 42, Current guiding insert; 5, Top cover assembly; 51, Top cover body; 52, Insulating film; 53, Adhesive-proof foam; 6, Thermally conductive adhesive. Detailed Implementation

[0058] The present invention will now be described in detail with reference to specific embodiments. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the present invention.

[0059] It should be noted that, unless otherwise explicitly specified and limited, the terms "first direction," "second direction," "third direction," "along," "towards," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "installation," "fitting," "connection," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixing" can be bolt fixing, snap-fit ​​fixing, or glue fixing. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," and "third" may explicitly or implicitly include one or more of that feature. "A plurality" or "several" means two or more. In addition, "and / or" includes any and all combinations of one or more of the related listed items. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0060] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0061] Figure 1 is a structural schematic diagram of the battery module provided in this application. Figure 2 is an exploded schematic diagram of the battery module provided in this application. Figure 3 is a cell assembly provided in this application, showing a schematic diagram of the broken weld seam formed by bending and welding the cell tabs. Figure 4 is a structural schematic diagram of the side of the battery module provided in this application. Figure 5 is a partial enlarged view of point A in Figure 4 provided in this application. Figure 6 is a structural schematic diagram of the FPC assembly provided in this application. Figure 7 is a structural schematic diagram of the end plate assembly provided in this application. Figure 8 is an exploded schematic diagram of the top cover assembly provided in this application.

[0062] Please refer to Figures 1-8. The battery module 100 includes: a cell assembly 1, a foam assembly 2, an FPC assembly 3, an end plate assembly 4, a top cover assembly 5, and thermally conductive adhesive 6.

[0063] FPC is an abbreviation for Flexible Printed Circuit, which is a type of printed circuit board made of polyimide or polyester film as a substrate and has high reliability and excellent flexibility.

[0064] The end plate assembly 4 is attached to the two opposite ends of the cell assembly 1 in the first direction 1001, while the FPC assembly 3 is disposed on the two opposite sides of the cell assembly 1 in the second direction 1002.

[0065] In addition, one side of the foam component 2 is attached to the cell component 1, and the other side of the foam component 2 can support the FPC component 3.

[0066] Furthermore, the side of the foam assembly 2 facing away from the battery cell assembly 1 can provide a support surface and a second snap-fit ​​hole 2131.

[0067] In addition, a portion of the FPC component 3 is soldered to at least a portion of the cell component 1, and at least a portion of the FPC component 3 is snapped to at least a portion of the foam component 2.

[0068] It should be noted that the top cover assembly 5 is attached to the top of the cell assembly 1 on the third-direction 1003 by thermally conductive adhesive 6, so that the top cover assembly 5 and the cell assembly 1 form an integral structure.

[0069] It is understandable that the first direction 1001, the second direction 1002, and the third direction 1003 are orthogonal to each other.

[0070] In some embodiments, as shown in Figures 2 and 3, the battery cell assembly 1 includes: end plate foam 13, N battery cell bodies 11 and N-1 battery cell large surface foams 12, where N is a positive integer not less than 5.

[0071] To further explain, a large-area foam 12 is provided between two adjacent cell bodies 11, and the end plate foam 13 is attached to the outside of the cell body 11 closest to the end plate assembly 4 among the N cell bodies 11.

[0072] In this embodiment, the preferred material for the large-area foam 12 of the battery cell is ceramicized silicon foam with excellent fire resistance and heat insulation, while the preferred material for the end plate foam 13 is MPP with lower cost. Both the large-area foam 12 and the end plate foam 13 are bonded to the battery cell body 11 with adhesive backing and pre-tightened to form the battery cell assembly 1.

[0073] Traditional battery modules consist of multiple pouch cells, inter-cell foam, plastic brackets, busbars, end plates, side plates, cover plates, bottom plates, fireproof and heat-insulating layers, sampling plates, and sealing or potting compound. The busbars are fixed to the plastic brackets. After the pouch cells are stacked with inter-cell foam, the cell tabs are bent and passed through the plastic brackets to weld them to the busbars. The sampling plate is welded to the busbars. The end plates, side plates, cover plates, and bottom plates are then laser-welded together after being wrapped. Finally, sealing or potting compound is filled into the gaps between the cell tabs and the end plates through the injection holes.

[0074] In summary, compared with traditional battery modules, this battery module 100 completely eliminates the carrier busbar welded between the cell tabs 111 (the positive and negative tabs are collectively referred to as cell tabs 111).

[0075] MPP is an abbreviation for Microcellular Polypropylene, which is a porous foam material made of polypropylene (PP) as the base material and formed into micron-sized bubbles using supercritical carbon dioxide technology.

[0076] In some embodiments, each cell body 11 is provided with a positive electrode tab and a negative electrode tab, the positive electrode tab being connected to the positive terminal of the cell body 11, and the negative electrode tab being connected to the negative terminal of the cell body 11.

[0077] In this embodiment of the application, the positive electrode tab and the negative electrode tab are collectively referred to as the cell tab 111.

[0078] In the two adjacent cell bodies 11, the positive electrode tab of one cell body 11 is bent at 90° to the negative electrode tab of the other cell body 11 to form an overlapping double-layer structure 1111.

[0079] In addition, the overlapping double-layer structure 1111 can be welded together to form a lug weld 1112 at the welding position.

[0080] In some embodiments, as can be seen from Figures 1-3, N battery cell bodies 11 are arranged in an orderly manner along the first direction 1001 in a preset manner, and the first battery cell body 11 and the Nth battery cell body 11 are used as end cells.

[0081] In this embodiment, the large-area foam 12 and the end plate foam 13 of the battery cell are both bonded to the battery cell body 11 as an integral structure, and both the large-area foam 12 and the end plate foam 13 of the battery cell can provide pre-tightening force.

[0082] Specifically, the end plate foam 13 is disposed between the end cell and the end plate assembly 4.

[0083] In some embodiments, as shown in Figures 1-5, the foam assembly 2 includes a foam body 21.

[0084] It should be noted that the foam body 21 includes a first body 211, a second body 212 and a third body 213, and the foam body 21 is Z-shaped.

[0085] It is understood that one end of the second body 212 is connected to the first body 211, and the other end of the second body 212 is connected to the third body 213.

[0086] It is understood that the first body 211 extends along the second direction 1002, the second body 212 extends along the third direction 1003, and the third body 213 extends along the second direction.

[0087] Specifically, the side of the third body 213 away from the second body 212 can support the overlapping double-layer structure 1111 to prevent the overlapping double-layer structure 1111 formed after the positive electrode tab and the negative electrode tab are bent at 90° from deforming or even short-circuiting.

[0088] Preferably, the design length of the foam body 21 in the third direction 1003 is different at different times for the cell body 11, but it is necessary to ensure that the support length of the third body supporting the overlapping double-layer structure 1111 is ≥10mm; and the thickness of the foam body 21 in the first direction 1001 is in the range of 8mm to 12mm.

[0089] It should be noted that the preferred material for the foam body 21 is EPDM or CR foam, which combines flame retardancy and low cost.

[0090] Understandably, EDPM is an abbreviation for Ethylene Propylene Diene Monomer, which is a foam material made from a terpolymer of ethylene, propylene, and non-conjugated dienes through a foaming process.

[0091] To further explain, CR is an abbreviation for Chloroprene Rubber, which is a foam material that is formed by high-temperature mixing with a foaming agent to create a uniform gel, and then foamed in a mold at high temperature to form a closed-cell structure.

[0092] In some embodiments, as shown in Figures 4 and 5, an aluminum-plastic film is provided on the battery cell body 11, and the foam assembly 2 further includes an adhesive layer 22 and a partial PC sheet 23.

[0093] The adhesive backing layer 22 is located on the side of the second body 212 that is away from the third body 213, and the foam body 21 is attached to the aluminum-plastic film through the adhesive backing layer 22.

[0094] Specifically, aluminum-plastic film is a composite flexible packaging shell material, which is usually a multi-layer film structure consisting of an outer nylon layer, a middle aluminum foil layer, and an inner heat-sealing layer, bound together with an adhesive. It is used to encapsulate the battery cell body of a battery module.

[0095] To further explain, the aluminum-plastic film can protect the electrodes of the battery cell body 11 (the electrodes being the positive and negative terminals of the battery cell body), thereby effectively preventing mechanical damage to the electrodes of the battery cell body 11 during production, transportation, and use; the aluminum-plastic film can also isolate the external environment, effectively preventing external substances such as oxygen and moisture from entering the battery cell body 11, avoiding battery performance degradation or other safety issues caused by electrolyte oxidation and moisture intrusion; the aluminum-plastic film can also provide heat-sealing performance, forming an effective encapsulation structure to ensure the sealing of the battery cell body 11; the aluminum-plastic film also has the advantages of being lightweight and low-cost.

[0096] In addition, a first snap-fit ​​hole 231 is provided on the partial PC sheet 23, and a second snap-fit ​​hole 2131 is provided on the side of the third body 213 opposite to the second body 212.

[0097] In addition, a partial PC sheet 23 is attached to the side of the third body 213 away from the second body 212, at which time the first snap-fit ​​hole 231 is coaxial with the second snap-fit ​​hole 2131.

[0098] In this embodiment of the application, the thickness of the partial PC sheet 23 is 1mm, the diameter of the first snap-fit ​​hole 231 is 3mm, and the diameter of the second snap-fit ​​hole 2131 is ≥5mm.

[0099] Specifically, after the foam assembly 2 is attached to the battery cell body 11, the top cover assembly 5 presses down on the first body 211, thereby further ensuring the reliable fixed position of the foam body 21.

[0100] Compared to traditional battery modules, the use of lighter foam components 2 to replace plastic brackets and sealing glue (or potting compound) reduces the material cost of the battery module 100 and also reduces its weight.

[0101] In some embodiments, as shown in Figures 2, 4 and 6, the FPC assembly 3 includes: an FPC body 31, a voltage acquisition terminal 32, a female snap fastener 33, a connector 34 and a pair of NTC acquisition terminals 35.

[0102] NTC is an abbreviation for Negative Temperature Coefficient, which usually refers to semiconductor materials or thermistor components with a negative temperature coefficient (a thermistor characteristic in which the resistance value decreases as the temperature rises). Specifically, the NTC acquisition terminal 35 can monitor the real-time temperature of the cell body 11 based on the negative temperature coefficient, thereby preventing the cell body 11 from being overcharged, over-discharged, or overheated, and thus ensuring the safety of the battery module 100.

[0103] It is understandable that a pair of NTC acquisition terminals 35 are symmetrically arranged at opposite ends of the FPC body 31 in its length direction, and the end of each NTC acquisition terminal 35 away from the FPC body 31 can be attached to the upper aluminum-plastic film surface of the cell body 11 by thermally conductive silicone.

[0104] It should be noted that the FPC body 31 has an upper and a lower part in its width direction, and the voltage acquisition terminal 32 is disposed in the lower part of the FPC body 31; in the embodiment of this application, the nickel sheet of the voltage acquisition terminal 32 is welded to the battery cell tab 111.

[0105] To further explain, the upper part of the FPC body 31 is provided with a snap-fit ​​part 3101, and the snap-fit ​​part 3101 corresponds to the first snap-fit ​​hole 231 and / or the second snap-fit ​​hole 2131.

[0106] In this embodiment, at least a portion of the snap fastener 33 extends through the snap-fit ​​portion 3101 to the first snap-fit ​​hole 231, so that the FPC body 31 is snapped onto the portion of the PC sheet 23.

[0107] To further explain, the two adjacent snap-fit ​​parts 3101 are spaced 200mm to 300mm apart, and each snap-fit ​​part 3101 has an elongated hole; the width of the elongated hole is 4mm and the length of the elongated hole is 8mm.

[0108] Generally speaking, an oblong hole refers to an opening type with semicircular arcs at both ends of a rectangle. Therefore, the width of the oblong hole is the same as the width of the rectangle, while the length of the oblong hole is the total distance between the endpoints of the two arcs (or, the length of the oblong hole can be understood as the sum of the length of the rectangle and the radii of the two arcs).

[0109] In this embodiment of the application, at least a portion of the snap fastener 33 can pass through the elongated hole to extend the FPC body 31 to the first snap-fit ​​hole 231 and insert it into the second snap-fit ​​hole 2131, so that the FPC body 31 can be snapped onto the partial PC sheet 23.

[0110] Specifically, connector 34 is disposed at the end of FPC body 31 in its length direction, and voltage acquisition terminal 32 is welded to the overlapping double-layer structure 1111 as an integral structure.

[0111] In summary, the FPC main body 31 is snapped onto the partial PC sheet 23, at which time the third body 213 can support the aforementioned FPC main body 31; and the voltage acquisition terminal 32 is welded and fixed to the overlapping double-layer structure 1111; therefore, the aforementioned support and fixation can effectively prevent the FPC component 3 from colliding with the cell tab 111, thereby increasing the stability and safety of this battery module 100.

[0112] In this embodiment of the application, when the FPC body 31 is snapped onto the partial PC sheet 23, the length direction of the FPC body 31 is parallel to the first direction 1001, and the width direction of the FPC body 31 is parallel to the third direction 1003.

[0113] Specifically, FPC components have the advantages of high integration and small space requirements.

[0114] In some embodiments, as can be seen from Figures 2 and 6, the FPC body 31 includes M substrates 311 and M-1 arched structures 312, where M is a positive integer not less than 2.

[0115] It should be noted that an arched structure 312 is provided between two adjacent substrates 311, and the substrates 311 and the arched structure 312 are integrally formed.

[0116] In this embodiment of the application, the arched structure 312 is used to absorb the deformation of the FPC body 31 in its length direction during the stacking of the battery module 100 and the stacked cell body 11; and the two adjacent arched structures are spaced 200mm to 300mm apart.

[0117] In some embodiments, as shown in Figures 2, 3, 4 and 7, the endplate assembly 4 includes an endplate body 41 and a flow guide insert 42.

[0118] In this embodiment of the application, the end plate body 41 is made of plastic material, and the design thickness of the end plate body 41 in the first direction 1001 is 8mm to 12mm; wherein, the preferred material of the end plate body 41 is PP+GF30.

[0119] Specifically, PP+GF30% is a composite material in which 30% glass fiber (GF) is added to a polypropylene (PP) matrix.

[0120] One side of the end plate body 41 faces the end cell, and the current guiding insert 42 is disposed on the other side of the end plate body 41.

[0121] In addition, when the end plate assembly 4 is attached to the two opposite ends of the cell assembly 1 in the first direction 1001, the end plate foam 13 filling between the end cell and the end plate body 41 can form a pre-tightening force.

[0122] Furthermore, the current-guiding insert 42 can be an aluminum busbar insert or a copper busbar insert; and the end plate body 41 and the current-guiding insert 42 are integrally injection molded. The current-guiding insert 42 at one end of the inner side of the end plate body 41 is welded to the cell tab 111, and the current-guiding insert 42 at one end of the outer side of the end plate body 41 serves as the output electrode of this battery module 100.

[0123] In this embodiment, the cross-sectional dimensions of the current guide insert 42 are determined according to the current carrying capacity. Compared with traditional battery modules, the end plate assembly 4 of this battery module 100 adopts a highly integrated one-piece injection molding, which can reduce the assembly time of this battery module 100 and make the space requirement of this battery module 100 smaller, resulting in lower overall cost.

[0124] In some embodiments, please refer to Figures 2 and 8. The cover assembly 5 includes: a cover body 51, an insulating film 52, and a sealant foam 53.

[0125] In this embodiment of the application, the upper cover body 51 may be made of aluminum, and the thickness of the upper cover body 51 on the third direction 1003 is 1mm.

[0126] To further explain, the preferred material for the insulating film 52 is PET (Polyethylene Terephthalate), and the thickness of the insulating film 52 is 0.5 mm.

[0127] It should be noted that the length of the cross-section of the adhesive-blocking foam 53 is 5mm, the width of the cross-section of the adhesive-blocking foam 53 is 5mm, and the preferred material of the adhesive-blocking foam 53 is CR or MPP; in this embodiment, the adhesive-blocking foam 53 is required to have a large foam compression and low hardness, so as to prevent the thermally conductive adhesive 6 from overflowing onto the two opposite sides of the battery cell body 11 in the second direction 1002 during the pressing process.

[0128] The insulating film 52 is hot-pressed onto the surface of the upper cover body 51 on the third direction 1003 and faces the cell assembly 1.

[0129] In addition, adhesive-blocking foam 53 is disposed on opposite sides of the upper cover body 51 in the second direction 1002 to enclose and form an adhesive-containing area.

[0130] In addition, when the top cover assembly 5 is attached to the top of the cell assembly 1 on the third-direction 1003 by the thermally conductive adhesive 6, the adhesive-blocking foam 53 can limit the overflow of the thermally conductive adhesive 6 into the adhesive-containing area.

[0131] In summary, compared with traditional battery modules, this battery module 100 eliminates the traditionally welded base plate and side plate, thereby reducing the materials and weight of the battery module 100, and thus making the overall cost of the battery module 100 lower.

[0132] In summary, the battery module provided by this utility model has the advantages of simple and reliable structure, fewer parts, simple assembly process, and high assembly efficiency, thereby enabling the battery module to achieve the goal of cost reduction. Therefore, the battery module provided by this utility model has a certain degree of novelty compared with traditional battery modules.

[0133] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and all of these fall within the protection scope of the present invention.

Claims

1. A battery module, characterized in that, include: The battery cell assembly, foam assembly, FPC assembly, end plate assembly, top cover assembly, and thermally conductive adhesive are provided. The end plate assemblies are attached to opposite ends of the battery cell assembly in a first direction, and the FPC assemblies are disposed on opposite sides of the battery cell assembly in a second direction. One side of the foam assembly is attached to the battery cell assembly, and the other side of the foam assembly can support the FPC assembly. A portion of the FPC assembly is welded to at least a portion of the battery cell assembly, and at least a portion of the FPC assembly is snapped onto at least a portion of the foam assembly. The top cover assembly is attached to the top of the battery cell assembly in a third direction using the thermally conductive adhesive, so that the top cover assembly and the battery cell assembly form an integral structure. The first direction, the second direction, and the third direction are orthogonal to each other.

2. The battery module according to claim 1, characterized in that, The battery cell assembly includes: end plate foam, N battery cell bodies, and N-1 large-area foam for battery cells, where N is a positive integer not less than 5; a large-area foam for battery cells is disposed between two adjacent battery cell bodies, and the end plate foam is attached to the outer side of the battery cell body closest to the end plate assembly among the N battery cell bodies.

3. The battery module according to claim 2, characterized in that, Each of the battery cells is provided with a positive electrode tab and a negative electrode tab. The positive electrode tab is connected to the positive terminal of the battery cell body, and the negative electrode tab is connected to the negative terminal of the battery cell body. In two adjacent battery cells, the positive electrode tab of one battery cell body and the negative electrode tab of the other battery cell body are bent at 90° to form an overlapping double-layer structure. The overlapping double-layer structure can be welded into one piece, and an electrode tab weld is formed at the welding position.

4. The battery module according to claim 3, characterized in that, The foam assembly includes: a foam body, the foam body comprising a first body, a second body and a third body, and the foam body being Z-shaped; one end of the second body is connected to the first body, and the other end of the second body is connected to the third body; wherein, the side of the third body opposite to the second body can support the overlapping double-layer structure.

5. The battery module according to claim 4, characterized in that, The battery cell body is provided with an aluminum-plastic film, and the foam assembly further includes: an adhesive backing layer; the adhesive backing layer is located on the side of the second body away from the third body, and the foam body is adhered to the aluminum-plastic film through the adhesive backing layer; a partial PC sheet; the partial PC sheet has a first snap-fit ​​hole, and the third body has a second snap-fit ​​hole on the side away from the second body; the partial PC sheet is attached to the side of the third body away from the second body, at which time the first snap-fit ​​hole and the second snap-fit ​​hole are coaxial.

6. The battery module according to claim 5, characterized in that, The FPC assembly includes: an FPC body, voltage acquisition terminals, a snap fastener, a connector, and a pair of NTC acquisition terminals; the pair of NTC acquisition terminals are symmetrically arranged at opposite ends of the FPC body along its length, and the end of each NTC acquisition terminal away from the FPC body can be attached to the aluminum-plastic film surface of the battery cell body; the FPC body has opposite upper and lower portions along its width, and the voltage acquisition terminals are located at the lower portion of the FPC body; the upper portion of the FPC body is provided with a snap-fit ​​portion, and the snap-fit ​​portion corresponds to the first snap-fit ​​hole and / or the second snap-fit ​​hole; at least a portion of the snap fastener extends through the snap-fit ​​portion to the first snap-fit ​​hole, so that the FPC body snaps onto the partial PC sheet; the connector is located at the end of the FPC body along its length, and the voltage acquisition terminals are welded to the overlapping double-layer structure as a single unit; when the FPC body snaps onto the partial PC sheet, the length direction of the FPC body is parallel to the first direction, and the width direction of the FPC body is parallel to the third direction.

7. The battery module according to claim 6, characterized in that, The FPC body includes: M substrates and M-1 arched structures, where M is a positive integer not less than 2; an arched structure is provided between two adjacent substrates, and the substrates and the arched structures are integrally formed.

8. The battery module according to claim 3, characterized in that, N battery cell bodies are arranged in an orderly manner along the first direction according to a preset pattern, with the first battery cell body and the Nth battery cell body serving as end cells; the large surface foam of the battery cell body and the end plate foam are both bonded to the battery cell body as an integral structure, and both the large surface foam of the battery cell body and the end plate foam can provide pre-tightening force; wherein, the end plate foam is disposed between the end cells and the end plate assembly.

9. The battery module according to claim 8, characterized in that, The end plate assembly includes: an end plate body and a current-guiding insert; one side of the end plate body faces the end cell, and the current-guiding insert is disposed on the other side of the end plate body; when the end plate assembly is attached to the two opposite ends of the cell assembly in the first direction, the end plate foam filling between the end cell and the end plate body can form the preload force.

10. The battery module according to claim 1, characterized in that, The top cover assembly includes: a top cover body, an insulating film, and adhesive-resistant foam; the insulating film is heat-pressed and bonded to the surface of the top cover body in the third direction, facing the battery cell assembly; the adhesive-resistant foam is disposed on opposite sides of the top cover body in the second direction to enclose and form an adhesive-containing area; when the top cover assembly is bonded to the top of the battery cell assembly in the third direction by the thermally conductive adhesive, the adhesive-resistant foam can limit the thermally conductive adhesive from overflowing into the adhesive-containing area.

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