Battery cell assembly and method of manufacturing the same

Abstract

According to an exemplary embodiment of the present invention, a battery cell assembly is provided. The battery cell assembly includes: a plurality of battery cells arranged along a first direction and including electrode leads; an integrated circuit assembly connected to the electrode leads of the plurality of battery cells; and a foaming mesh inserted between the integrated circuit assembly and the plurality of battery cells.

Description

Technical Field

[0001] This disclosure relates to a battery cell assembly and a method for manufacturing the same. This application claims priority to Korean Patent Application No. 10-2024-0058898, filed May 3, 2024, the entire contents of which are incorporated herein by reference. Background Technology

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. They are widely used as a power source for various types of wireless devices, such as mobile phones, laptops, and cordless vacuum cleaners. Recently, due to increased energy density and economies of scale leading to a significant decrease in the unit capacity manufacturing cost of secondary batteries, and with battery electric vehicles (BEVs) achieving driving ranges comparable to gasoline-powered vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0003] As secondary batteries are increasingly used in transportation vehicles, the demand for their stability is constantly growing. When secondary batteries used in transportation vehicles experience accidents such as fires, the lives of drivers may be threatened; therefore, technological research to enhance the stability of secondary batteries is essential. Summary of the Invention

[0004] Technical issues

[0005] This disclosure aims to provide a battery cell assembly with improved safety and a method for manufacturing the same.

[0006] Technical solution

[0007] Embodiments of this disclosure provide a battery cell assembly. The battery cell assembly includes: a plurality of battery cells arranged along a first direction, each battery cell including electrode leads; an integrated circuit assembly connected to the electrode leads of each of the plurality of battery cells; and a foaming mesh inserted between the integrated circuit assembly and the plurality of battery cells.

[0008] The foaming net may include a net and a foaming coating applied to the net.

[0009] The foamed coating can be configured to form a thermal insulation layer in the event of a thermal runaway event in the plurality of battery cells.

[0010] The integrated circuit assembly may include an insulating frame and an integrated circuit mounted on the insulating frame, and the foaming net may be connected to the insulating frame.

[0011] The foamed mesh can be thermally fused to the insulating frame.

[0012] The insulating frame may include a first surface facing the plurality of battery cells, and the foamed mesh may be attached to the first surface.

[0013] The insulating frame may include a plurality of first slits, and the foamed mesh may include second slits that overlap with the plurality of first slits.

[0014] The electrode leads of each of the plurality of battery cells can pass through a corresponding slit among the plurality of first slits and second slits.

[0015] The battery cell assembly may further include a pad inserted between the plurality of battery cells, and the foaming net may overlap the pad in a second direction perpendicular to the first direction.

[0016] The foaming net can overlap with a portion of the battery cells in the second direction.

[0017] The foaming net can overlap with each of the plurality of battery cells in the second direction.

[0018] An embodiment provides a battery cell assembly. The battery cell assembly may include: a plurality of battery cells arranged along a first direction, each battery cell including electrode leads; an integrated circuit assembly connected to the electrode leads of each of the plurality of battery cells; and a plurality of foaming nets inserted between the integrated circuit assembly and the plurality of battery cells.

[0019] Beneficial effects

[0020] According to embodiments of this disclosure, by adhering a foamed mesh to an integrated circuit assembly, the time required to apply the foamed coating during the manufacturing of battery cell assemblies can be reduced, and the productivity of battery cell assemblies can be improved.

[0021] The effects obtained from the embodiments of this disclosure are not limited to those described above. Other effects not described herein will be clearly derived and understood by those skilled in the art from the following description. In other words, unintended effects achieved when implementing the embodiments of this disclosure can be derived by those skilled in the art from the embodiments of this disclosure. Attached Figure Description

[0022] Figure 1 This is a perspective view used to describe a battery cell assembly according to an embodiment.

[0023] Figure 2 and Figure 3 This is an exploded perspective view used to describe a battery cell assembly according to an embodiment.

[0024] Figure 4 This is a plan view of a battery cell assembly according to an embodiment.

[0025] Figure 5 This is a perspective view of the insulating frame and foam net according to the embodiment.

[0026] Figure 6 This is a rear view of the insulating frame and foam netting according to the embodiment.

[0027] Figure 7 This is a flowchart of a method for providing a battery cell assembly according to an embodiment.

[0028] Figure 8 This is a perspective view used to describe a method of providing a battery cell assembly according to an embodiment.

[0029] Figure 9 This is a cross-sectional view of the foaming net according to the embodiment.

[0030] Figure 10 This is a perspective view of the insulating frame and foam net according to the embodiment.

[0031] Figure 11 This is a rear view of the insulating frame and foam netting according to the embodiment. Detailed Implementation

[0032] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. Before describing the embodiments of this disclosure, the terms or expressions used in this specification and claims should not be construed as limited to their commonly understood meanings or meanings as defined in common dictionaries, but should be understood based on the principle that the inventor of the application may appropriately define the terms or expressions to best interpret this disclosure, according to the meanings and concepts corresponding to this disclosure.

[0033] Therefore, the embodiments described herein and the structures shown in the figures are merely embodiments of this disclosure and do not reflect all the technical ideas of this disclosure. It should be understood that various equivalents and modifications may have been made to replace these structures when this application was filed.

[0034] When it is determined that well-known constructions or functions related to the description of this disclosure would obscure the subject matter of this disclosure due to unnecessary detail, they will not be described in detail.

[0035] Because the embodiments of this disclosure are provided to explain the disclosure more fully to those skilled in the art, the shapes, dimensions, etc. of the components shown in the figures may be exaggerated, omitted, or illustrated for clarity. Therefore, it should not be construed that the dimensions or proportions of the components fully reflect their actual dimensions or proportions.

[0036] (First Implementation)

[0037] Figure 1 This is a perspective view used to describe the battery cell assembly 120 according to an embodiment.

[0038] Figure 2 and Figure 3 This is a perspective view illustrating the battery cell assembly 120 according to an embodiment. More specifically, Figure 2 and Figure 3 This is a view of the battery cell assembly 120 from different angles.

[0039] Reference Figures 1 to 5 The battery cell assembly 120 may include multiple battery cells 121_1, 121_2, 121_3, 121_4, 121_5, 121_6, 121_7, 121_8, 121_9, 121_10, 121_11, 121_12, 121_13, 121_14, 121_15, and 121_16 (hereinafter referred to as 121_1 to 121_16), a pad 122, a first integrated circuit assembly 123, a first insulating cover 124, a second integrated circuit assembly 125, a second insulating cover 126, a flexible flat cable (FFC) assembly 127, a fire-resistant sheet, and a top cover. The battery cell assembly 120 may not include a module frame.

[0040] The multiple battery cells 121_1 to 121_16 may be lithium-ion batteries. Each of the multiple battery cells 121_1 to 121_16 includes an electrode assembly, an electrolyte, and a cell casing. The cell casing may include an aluminum laminate, a cylindrical metal can, a prismatic metal can, or a combination thereof.

[0041] The electrode assembly contained in the cell housing includes a positive electrode, a negative electrode, and a separator located between the positive and negative electrodes. The electrode assembly can be a wound-core type electrode assembly or a stacked type electrode assembly. A wound-core type electrode assembly can include a structure in which the positive electrode, negative electrode, and separator located between the positive and negative electrodes are wound together. A stacked type electrode assembly can include multiple positive electrodes and multiple negative electrodes sequentially stacked, as well as multiple separators located between the positive and negative electrodes. The positive electrode can include a positive current collector and a positive electrode active material. The negative electrode can include a negative current collector and a negative electrode active material.

[0042] Each of the multiple battery cells 121_1 to 121_16 may include a positive electrode lead 121P and a negative electrode lead 121N. The positive electrode lead 121P and the negative electrode lead 121N can be collectively referred to as electrode leads. That is, electrode leads can be understood as representing the positive electrode lead 121P and / or the negative electrode lead 121N. The positive electrode lead 121P can be connected to the negative electrode tab of the electrode assembly, for example, by ultrasonic welding. The negative electrode lead 121N can be connected to the negative electrode tab of the electrode assembly, for example, by ultrasonic welding.

[0043] Multiple battery cells 121_1 to 121_16 can be arranged along the X-axis. Each of the multiple battery cells 121_1 to 121_16 can be a bidirectional cell. Therefore, the positive lead 121P and the negative lead 121N of each of the multiple battery cells 121_1 to 121_16 can protrude from the cell housing in opposite directions. The positive lead 121P and the negative lead 121N of each of the multiple battery cells 121_1 to 121_16 can be spaced apart from each other in the Y-axis direction. The Y-axis direction can be substantially perpendicular to the X-axis direction.

[0044] The technical concept of this disclosure will be described below with reference to an example in which each of the plurality of battery cells 121_1 to 121_16 is a bidirectional cell. Those skilled in the art will be able to readily derive, based on the description herein, an implementation in which each of the plurality of battery cells 121_1 to 121_6 is a unidirectional cell.

[0045] Battery cells 121_1 can be connected in parallel. The positive leads 121P of battery cells 121_1 can be shorted together. The positive leads 121P of battery cells 121_1 can be soldered together. The negative leads 121N of battery cells 121_1 can be shorted together. The negative leads 121N of battery cells 121_1 can be soldered together.

[0046] Battery cells 121_2 can be connected in parallel. The positive leads 121P of battery cells 121_2 can be shorted together. The positive leads 121P of battery cells 121_2 can be soldered together. The negative leads 121N of battery cells 121_2 can be shorted together. The negative leads 121N of battery cells 121_2 can be soldered together. Battery cells 121_2 can form a second battery cell group.

[0047] Battery cells 121_3 can be connected in parallel. The positive leads 121P of battery cells 121_3 can be shorted together. The positive leads 121P of battery cells 121_3 can be soldered together. The negative leads 121N of battery cells 121_3 can be shorted together. The negative leads 121N of battery cells 121_3 can be soldered together. Battery cells 121_3 can form a third battery cell group.

[0048] Battery cells 121_4 can be connected in parallel. The positive leads 121P of battery cells 121_4 can be shorted together. The positive leads 121P of battery cells 121_4 can be soldered together. The negative leads 121N of battery cells 121_4 can be shorted together. The negative leads 121N of battery cells 121_4 can be soldered together. Battery cells 121_4 can form a fourth battery cell group.

[0049] Battery cells 121_5 can be connected in parallel. The positive leads 121P of battery cells 121_5 can be short-circuited. The positive leads 121P of battery cells 121_5 can be soldered to each other. The negative leads 121N of battery cells 121_5 can be short-circuited. The negative leads 121N of battery cells 121_5 can be soldered to each other. Battery cells 121_5 can form a fifth battery cell group.

[0050] Battery cells 121_6 can be connected in parallel. The positive leads 121P of battery cells 121_6 can be shorted together. The positive leads 121P of battery cells 121_6 can be soldered together. The negative leads 121N of battery cells 121_6 can be shorted together. The negative leads 121N of battery cells 121_6 can be soldered together. Battery cells 121_6 can form a sixth battery cell group.

[0051] Battery cells 121_7 can be connected in parallel. The positive leads 121P of battery cells 121_7 can be shorted together. The positive leads 121P of battery cells 121_7 can be soldered together. The negative leads 121N of battery cells 121_7 can be shorted together. The negative leads 121N of battery cells 121_7 can be soldered together. Battery cells 121_7 can form a seventh battery cell group.

[0052] Battery cells 121_8 can be connected in parallel. The positive leads 121P of battery cells 121_8 can be shorted together. The positive leads 121P of battery cells 121_8 can be soldered together. The negative leads 121N of battery cells 121_8 can be shorted together. The negative leads 121N of battery cells 121_8 can be soldered together. Battery cells 121_8 can form an eighth battery cell group.

[0053] Battery cells 121_9 can be connected in parallel. The positive leads 121P of battery cells 121_9 can be shorted together. The positive leads 121P of battery cells 121_9 can be soldered together. The negative leads 121N of battery cells 121_9 can be shorted together. The negative leads 121N of battery cells 121_9 can be soldered together. Battery cells 121_9 can form a ninth battery cell group.

[0054] Battery cells 121_10 can be connected in parallel. The positive leads 121P of battery cells 121_10 can be shorted together. The positive leads 121P of battery cells 121_10 can be soldered together. The negative leads 121N of battery cells 121_10 can be shorted together. The negative leads 121N of battery cells 121_10 can be soldered together. Battery cells 121_10 can form a tenth battery cell group.

[0055] Battery cells 121_11 can be connected in parallel. The positive leads 121P of battery cells 121_11 can be short-circuited. The positive leads 121P of battery cells 121_11 can be soldered to each other. The negative leads 121N of battery cells 121_11 can be short-circuited. The negative leads 121N of battery cells 121_11 can be soldered to each other. Battery cells 121_11 can form an eleventh battery cell group.

[0056] Battery cells 121_12 can be connected in parallel. The positive leads 121P of battery cells 121_12 can be shorted together. The positive leads 121P of battery cells 121_12 can be soldered together. The negative leads 121N of battery cells 121_12 can be shorted together. The negative leads 121N of battery cells 121_12 can be soldered together. Battery cells 121_12 can form a twelfth battery cell group.

[0057] Battery cells 121_13 can be connected in parallel. The positive leads 121P of battery cells 121_13 can be shorted together. The positive leads 121P of battery cells 121_13 can be soldered together. The negative leads 121N of battery cells 121_13 can be shorted together. The negative leads 121N of battery cells 121_13 can be soldered together. Battery cells 121_13 can form a thirteenth battery cell group.

[0058] Battery cells 121_14 can be connected in parallel. The positive leads 121P of battery cells 121_14 can be shorted together. The positive leads 121P of battery cells 121_14 can be soldered together. The negative leads 121N of battery cells 121_14 can be shorted together. The negative leads 121N of battery cells 121_14 can be soldered together. Battery cells 121_14 can form the fourteenth battery cell group.

[0059] Battery cells 121_15 can be connected in parallel. The positive leads 121P of battery cells 121_15 can be shorted together. The positive leads 121P of battery cells 121_15 can be soldered together. The negative leads 121N of battery cells 121_15 can be shorted together. The negative leads 121N of battery cells 121_15 can be soldered together. Battery cells 121_15 can form the fifteenth battery cell group.

[0060] Battery cells 121_16 can be connected in parallel. The positive leads 121P of battery cells 121_16 can be shorted together. The positive leads 121P of battery cells 121_16 can be soldered together. The negative leads 121N of battery cells 121_16 can be shorted together. The negative leads 121N of battery cells 121_16 can be soldered together. Battery cells 121_16 can form the sixteenth battery cell group.

[0061] The negative lead 121N of battery cell 121_1 in the first battery cell group can be short-circuited to the positive lead 121P of battery cell 121_2 in the second battery cell group. The negative lead 121N of battery cell 121_1 in the first battery cell group can be soldered to the positive lead 121P of battery cell 121_2 in the second battery cell group.

[0062] The negative lead 121N of battery cell 121_2 in the second battery cell group can be short-circuited to the positive lead 121P of battery cell 121_3 in the third battery cell group. The negative lead 121N of battery cell 121_2 in the second battery cell group can be soldered to the positive lead 121P of battery cell 121_3 in the third battery cell group.

[0063] The negative lead 121N of battery cell 121_3 in the third battery cell group can be short-circuited to the positive lead 121P of battery cell 121_4 in the fourth battery cell group. The negative lead 121N of battery cell 121_3 in the third battery cell group can be soldered to the positive lead 121P of battery cell 121_4 in the fourth battery cell group.

[0064] The negative lead 121N of battery cell 121_4 in the fourth battery cell group can be short-circuited to the positive lead 121P of battery cell 121_5 in the fifth battery cell group. The negative lead 121N of battery cell 121_4 in the fourth battery cell group can be soldered to the positive lead 121P of battery cell 121_5 in the fifth battery cell group.

[0065] The negative lead 121N of battery cell 121_5 in the fifth battery cell group can be short-circuited to the positive lead 121P of battery cell 121_6 in the sixth battery cell group. The negative lead 121N of battery cell 121_5 in the fifth battery cell group can be soldered to the positive lead 121P of battery cell 121_6 in the sixth battery cell group.

[0066] The negative lead 121N of battery cell 121_6 in the sixth battery cell group can be short-circuited to the positive lead 121P of battery cell 121_7 in the seventh battery cell group. The negative lead 121N of battery cell 121_6 in the sixth battery cell group can be soldered to the positive lead 121P of battery cell 121_7 in the seventh battery cell group.

[0067] The negative lead 121N of battery cell 121_7 in the seventh battery cell group can be short-circuited to the positive lead 121P of battery cell 121_8 in the eighth battery cell group. The negative lead 121N of battery cell 121_7 in the seventh battery cell group can be soldered to the positive lead 121P of battery cell 121_8 in the eighth battery cell group.

[0068] The negative lead 121N of battery cell 121_8 in the eighth battery cell group can be short-circuited to the positive lead 121P of battery cell 121_9 in the ninth battery cell group. The negative lead 121N of battery cell 121_8 in the eighth battery cell group can be soldered to the positive lead 121P of battery cell 121_9 in the ninth battery cell group.

[0069] The negative lead 121N of battery cell 121_9 in the ninth battery cell group can be short-circuited to the positive lead 121P of battery cell 121_10 in the tenth battery cell group. The negative lead 121N of battery cell 121_9 in the ninth battery cell group can be soldered to the positive lead 121P of battery cell 121_10 in the tenth battery cell group.

[0070] The negative lead 121N of battery cell 121_10 in the tenth battery cell group can be short-circuited to the positive lead 121P of battery cell 121_11 in the eleventh battery cell group. The negative lead 121N of battery cell 121_10 in the tenth battery cell group can be soldered to the positive lead 121P of battery cell 121_11 in the eleventh battery cell group.

[0071] The negative lead 121N of battery cell 121_11 in the eleventh battery cell group can be short-circuited to the positive lead 121P of battery cell 121_12 in the twelfth battery cell group. The negative lead 121N of battery cell 121_11 in the eleventh battery cell group can be soldered to the positive lead 121P of battery cell 121_12 in the twelfth battery cell group.

[0072] The negative lead 121N of battery cell 121_12 in the twelfth battery cell group can be short-circuited to the positive lead 121P of battery cell 121_13 in the thirteenth battery cell group. The negative lead 121N of battery cell 121_12 in the twelfth battery cell group can be soldered to the positive lead 121P of battery cell 121_13 in the thirteenth battery cell group.

[0073] The negative lead 121N of battery cell 121_13 in the thirteenth battery cell group can be short-circuited to the positive lead 121P of battery cell 121_14 in the fourteenth battery cell group. The negative lead 121N of battery cell 121_13 in the thirteenth battery cell group can be soldered to the positive lead 121P of battery cell 121_14 in the fourteenth battery cell group.

[0074] The negative lead 121N of battery cell 121_14 in the fourteenth battery cell group can be short-circuited to the positive lead 121P of battery cell 121_15 in the fifteenth battery cell group. The negative lead 121N of battery cell 121_14 in the fourteenth battery cell group can be soldered to the positive lead 121P of battery cell 121_15 in the fifteenth battery cell group.

[0075] The negative lead 121N of battery cell 121_15 in the fifteenth battery cell group can be shorted to the positive lead 121P of battery cell 121_16 in the sixteenth battery cell group. The negative lead 121N of battery cell 121_15 in the fifteenth battery cell group can be soldered to the positive lead 121P of battery cell 121_16 in the sixteenth battery cell group.

[0076] Therefore, the first to sixteenth battery cell groups can be connected in series. As described above, the battery cell assembly 120 may include sixteen battery cell groups, each comprising three battery cells, but this is merely a non-limiting example and should not be construed as limiting the technical concept of this disclosure in any way. The number of battery cells connected in parallel and the number of battery cell groups connected in series can be varied depending on the desired output voltage and current.

[0077] The pad 122 can be inserted between battery cells 121_2 and 121_3, between battery cells 121_4 and 121_5, between battery cells 121_6 and 121_7, between battery cells 121_8 and 121_9, between battery cells 121_10 and 121_11, between battery cells 121_12 and 121_13, and between battery cells 121_14 and 121_15.

[0078] According to some embodiments, pad 122 may include polyurethane. Pad 122 may be elastic, thus absorbing the expansion of the plurality of battery cells 121_1 to 121_16 depending on the use of the battery cell assembly 120.

[0079] According to other embodiments, pad 122 may be a thermal barrier. According to one embodiment, each of the plurality of pads 122 may have a high melting point temperature and low thermal conductivity. When each of the plurality of pads 122 is a thermal barrier, each of the plurality of pads 122 may include a flame-retardant material, such as ceramic or coated glass fiber. A first integrated circuit assembly 123 may be located on a first side of the battery cell assembly 120. The first integrated circuit assembly 123 may be coupled to the first side of the battery cell assembly 120. The positive lead 121P of each of battery cells 121_1, 121_3, 121_5, 121_7, 121_9, 121_11, 121_13 and 121_15, and the negative lead 121N of each of battery cells 121_2, 121_4, 121_6, 121_8, 121_10, 121_12, 121_14 and 121_16 can be located on the first side.

[0080] The first integrated circuit assembly 123 may include a first bus frame 123F, a first integrated circuit 123C, a first bus 123P, and a second bus 123N.

[0081] The first bus frame 123F may include insulating material. The first bus frame 123F may support the positive lead 121P of each of the first bus 123P, the second bus 123N, the battery cells 121_1, 121_3, 121_5, 121_7, 121_9, 121_11, 121_13 and 121_15, and the negative lead 121N of each of the battery cells 121_2, 121_4, 121_6, 121_8, 121_10, 121_12, 121_14 and 121_16.

[0082] The first integrated circuit 123C may be mounted on the first bus frame 123F. The first integrated circuit 123C may be configured to acquire the voltage of a plurality of nodes consisting of a plurality of battery cells 121_1 to 121_16. For example, the first integrated circuit 123C may include a plurality of sensing boards soldered to the positive lead 121P of each of the battery cells 121_1, 121_3, 121_5, 121_7, 121_9, 121_11, 121_13 and 121_15 and the negative lead 121N of each of the battery cells 121_2, 121_4, 121_6, 121_8, 121_10, 121_12, 121_14 and 121_16. As another example, the first integrated circuit 123C can be connected via bonding wires to the positive lead 121P of each of the battery cells 121_1, 121_3, 121_5, 121_7, 121_9, 121_11, 121_13 and 121_15, and to the negative lead 121N of each of the battery cells 121_2, 121_4, 121_6, 121_8, 121_10, 121_12, 121_14 and 121_16.

[0083] The first bus 123P can contact the positive lead 121P of battery cell 121_1. The first bus 123P can be soldered to the positive lead 121P of battery cell 121_1. The second bus 123N can contact the negative lead 121N of battery cell 121_16. The second bus 123N can be soldered to the positive lead 121N of battery cell 121_16. Based on the electrical connection of multiple battery cells 121_1 to 121_16, the resulting voltage and current can be output to the outside through the first bus 123P and the second bus 123N.

[0084] The first insulating cover 124 can be coupled to the first integrated circuit assembly 123. The first insulating cover 124 can be mounted on the first bus frame 123F. The first insulating cover 124 can be coupled to the first bus frame 123F by interference fit.

[0085] The first insulating cover 124 may include insulating material. The first insulating cover 124 may cover the positive lead 121P of each of battery cells 121_1, 121_3, 121_5, 121_7, 121_9, 121_11, 121_13, and 121_15, and the negative lead 121N of each of battery cells 121_2, 121_4, 121_6, 121_8, 121_10, 121_12, 121_14, and 121_16. The first insulating cover 124 may include slits exposing the first bus 123P and the second bus 123N. The first bus 123P and the second bus 123N can contact busbar connectors, etc., through the slits of the first insulating cover 124.

[0086] The second integrated circuit assembly 125 may be located on a second side of the battery cell assembly 120. The second side may be opposite to the first side. The second integrated circuit assembly 125 may be spaced apart from the first integrated circuit assembly 123, and a plurality of battery cells 121_1 to 121_6 are located therebetween. The second integrated circuit assembly 125 may be connected to the second side of the battery cell assembly 120. The negative electrode lead 121N of each of battery cells 121_1, 121_3, 121_5, 121_7, 121_9, 121_11, 121_13, and 121_15, and the positive electrode lead 121P of each of battery cells 121_2, 121_4, 121_6, 121_8, 121_10, 121_12, 121_14, and 121_16 may be located on the second side. The second integrated circuit assembly 125 may include a second bus frame 125F and a second integrated circuit 125C.

[0087] The second bus frame 125F may include insulating material. The second bus frame 125F may support the negative lead 121N of each of the battery cells 121_1, 121_3, 121_5, 121_7, 121_9, 121_11, 121_13 and 121_15, and the positive lead 121P of each of the battery cells 121_2, 121_4, 121_6, 121_8, 121_10, 121_12, 121_14 and 121_16.

[0088] The second integrated circuit 125C can be mounted on the second bus frame 125F. The second integrated circuit 125C can be configured to acquire the voltage of multiple nodes consisting of multiple battery cells 121_1 to 121_16. For example, the second integrated circuit 125C may include multiple sensing boards soldered to the negative lead 121N of each of the battery cells 121_1, 121_3, 121_5, 121_7, 121_9, 121_11, 121_13, and 121_15, and the positive lead 121P of each of the battery cells 121_2, 121_4, 121_6, 121_8, 121_10, 121_12, 121_14, and 121_16. As another example, the first integrated circuit 123C can be connected via bonding wires to the negative lead 121N of each of the battery cells 121_1, 121_3, 121_5, 121_7, 121_9, 121_11, 121_13 and 121_15, and to the positive lead 121P of each of the battery cells 121_2, 121_4, 121_6, 121_8, 121_10, 121_12, 121_14 and 121_16.

[0089] The second insulating cover 126 can be coupled to the second integrated circuit assembly 125. The second insulating cover 126 can be mounted on the second bus frame 125F. The second insulating cover 126 can be coupled to the second bus frame 125F via an interference fit. The second insulating cover 126 may include insulating material. The second insulating cover 126 may include foamed refractory coating. The second insulating cover 126 can cover the negative lead 121N of each of the battery cells 121_1, 121_3, 121_5, 121_7, 121_9, 121_11, 121_13, and 121_15, and the positive lead 121P of each of the battery cells 121_2, 121_4, 121_6, 121_8, 121_10, 121_12, 121_14, and 121_16.

[0090] FFC component 127 can be located on battery cells 121_1 to 121_16. FFC component 127 can have an approximately linear shape. FFC component 127 can connect a first integrated circuit 123C and a second integrated circuit 125C to each other. The voltage detected by the second integrated circuit can be transmitted to the first integrated circuit 123C through FFC component 127.

[0091] The foamed mesh 128 can be inserted between multiple battery cells 121 and the first insulating frame 123F. The foamed mesh 128 may include a foam coating 128C (see...). Figure 9The foamed coating foams when exposed to high temperatures (e.g., in a thermal runaway event). When the dry coating foams, an insulating layer (e.g., a carbonized layer) with a volume several tens of times that of the dry coating can be formed. This insulating layer can mitigate or block heat spread and gas emissions in multiple battery cells 121_1 to 121_16 and allow directional venting of the battery cell assembly 120.

[0092] The foamed net 128 may include a mesh structure. The mesh structure may consist of vertices (peaks) and line segments (edges) connecting the vertices. The vertices of the mesh structure may be nodes or connection points. The foamed net 128 may include a generally uniform pattern. The pattern may include, but is not limited to, rhombuses, squares, hexagons, or circles.

[0093] The foamed mesh 128 can be flexible and elastic. Therefore, the foamed mesh 128 can be easily attached to the first surface 123FS1 of the first insulating frame 123F, which has irregularities (see...). Figure 8 First surface 123FS1 (see) Figure 8 It can be used with multiple battery cells 121_1 to 121_16. According to an embodiment, the foamed mesh 128 can be thermally fused to the insulating frame.

[0094] The insulating frame 123F may include slits 123S1 and slits 123S2. Slits 123S1 and 123S2 may be traversed by electrode leads of corresponding battery cells from a plurality of battery cells 121_1 to 121_16. Each slit in slit 123S1 may be traversed by a positive lead 121P of a corresponding battery cell from battery cells 121_1, 121_3, 121_5, 121_7, 121_9, 121_11, 121_13, and 121_15. Each slit in slit 123S2 may be traversed by a negative lead 121N of a corresponding battery cell from battery cells 121_2, 121_4, 121_6, 121_8, 121_10, 121_12, 121_14, and 121_16.

[0095] The electrode lead of each of the multiple battery cells 121_1 to 121_16 can pass through the corresponding slit in slit 123S1 and slit 123S2. The positive electrode lead 121P of each of the battery cells 121_1, 121_3, 121_5, 121_7, 121_9, 121_11, 121_13, and 121_15 can pass through a corresponding slit 123S1. The negative electrode lead 121N of each of the battery cells 121_2, 121_4, 121_6, 121_8, 121_10, 121_12, 121_14, and 121_16 can pass through a corresponding slit 123S2.

[0096] The foamed mesh 128 may include slits 128S1 and slits 128S2. Slit 128S1 may overlap with slit 123S1 in the Y-axis direction. Slit 128S2 may overlap with slit 123S2 in the Y-axis direction.

[0097] Slits 128S1 and 128S2 can be traversed by electrode leads of corresponding battery cells from multiple battery cells 121_1 to 121_16. Each slit in slit 128S1 can be traversed by the positive electrode lead 121P of corresponding battery cells from battery cells 121_1, 121_3, 121_5, 121_7, 121_9, 121_11, 121_13, and 121_15. Each slit in slit 128S2 can be traversed by the negative electrode lead 121N of corresponding battery cells from battery cells 121_2, 121_4, 121_6, 121_8, 121_10, 121_12, 121_14, and 121_16.

[0098] The electrode lead of each of the multiple battery cells 121_1 to 121_16 can pass through the corresponding slit in slit 128S1 and slit 128S2. The positive electrode lead 121P of each of the battery cells 121_1, 121_3, 121_5, 121_7, 121_9, 121_11, 121_13, and 121_15 can pass through a corresponding slit 128S1. The negative electrode lead 121N of each of the battery cells 121_2, 121_4, 121_6, 121_8, 121_10, 121_12, 121_14, and 121_16 can pass through a corresponding slit 128S2.

[0099] According to the embodiment, the foaming coating 128M of the foaming mesh 128 (see...) Figure 9 In the event of thermal runaway, a thermal insulation layer with increased volume is formed, thereby filling the space between the multiple battery cells 121_1 to 121_16 and the first busbar frame 123F. Therefore, the forward movement of high-temperature gases emitted from the multiple battery cells 121_1 to 121_16 during a thermal runaway event can be prevented, and directional venting of the battery cell assembly 120 can be achieved.

[0100] The battery cell assembly 120 may also include an additional foaming mesh between the plurality of battery cells 121_1 to 121_16 and the second bus frame 125F. The additional foaming mesh is substantially the same as the foaming mesh 128, except that it is connected to the second bus frame 125.

[0101] The battery cell assembly 120 may include a fire-resistant sheet and a top cover on a plurality of battery cells 121_1 to 121_16. The fire-resistant sheet may be inserted between the plurality of battery cells 121_1 to 121_16 and the top cover. The top cover may have higher rigidity than the fire-resistant sheet, thereby protecting the plurality of battery cells 121_1 to 121_16.

[0102] Refractory sheets can include refractory materials such as mica. Each refractory sheet includes multiple perforated guide sections. These perforated guide sections can be formed through methods such as die processing; their mechanical strength is weaker than other parts of the refractory sheet, making them relatively prone to breakage.

[0103] When a thermal runaway event occurs, the refractory sheet portion with multiple perforated guides can easily break due to the presence of multiple perforated guides. Therefore, the high-temperature gas generated from multiple battery cells 121_1 to 121_16 can be discharged through the vent hole of the top cover.

[0104] (Second Implementation)

[0105] Figure 7 This is a flowchart of a method for providing a battery cell assembly according to an embodiment.

[0106] Figure 8 This is a perspective view used to describe a method of providing a battery cell assembly according to an embodiment.

[0107] Figure 9 This is a cross-sectional view of the foaming net according to the embodiment.

[0108] Reference Figures 6 to 9 In P110, a foamed mesh 128 may be provided. Providing the foamed mesh 128 may include immersing the mesh 128M in a foaming material or spraying the foaming material onto the mesh 128M. A foam coating 128C may be applied to the surface of the mesh 128M via processes such as immersion and spraying. After immersion and spraying, the foamed mesh 128 may be additionally dried.

[0109] Next, in P120, the foamed mesh 128 can be attached to the insulating frame 123F. The insulating frame 123F can be attached to the foamed mesh 128 by a thermal fusion process. During the thermal fusion process, the insulating frame 123F or the foamed mesh 128 can melt and then solidify again, thereby fixing the insulating frame 123F and the foamed mesh 128 to each other.

[0110] The foamed mesh 128 can be attached to a first surface 123FS1 of the insulating frame 123F. The insulating frame 123F may also include a second surface 123FS2 opposite to the first surface 123FS1.

[0111] Subsequently, in P130, slits 128S1 and 128S2 can be formed in the foamed mesh 128. Slits 128S1 and 128S2 can be formed by machining. The formation of slits 128S1 and 128S2 in P130 can be performed before P110 or P120.

[0112] Next, refer to Figures 1 to 6 A battery cell assembly 120 may be provided. The battery cell assembly 120 may include: stacking a plurality of battery cells 121_1 to 121_16 and a plurality of pads 122; connecting a first bus frame 123F and a second bus frame 125F, on which a first integrated circuit 123C and a second integrated circuit 125C are mounted, to the plurality of battery cells 121_1 to 121_16; and connecting the positive electrode lead 121P and the negative electrode lead 121N of the plurality of battery cells 121_1 to 121_16 to the first bus 122. 3P and the second bus 123N are soldered together; the positive leads 121P and negative leads 121N of the first integrated circuit 123C and the second integrated circuit 125C and the plurality of battery cells 121_1 to 121_16 are connected; the first insulating cover 124 and the second insulating cover 126 are connected to the first bus frame 123F and the second bus frame 125F; and the first integrated circuit 123C and the second integrated circuit 125C are connected to the FFC assembly 127.

[0113] (Third Implementation)

[0114] Figure 10 This is a perspective view of the insulating frame 123F and the foamed net 128' according to the embodiment.

[0115] Figure 11 This is a rear view of the insulating frame 123F and the foamed net 128' according to the embodiment.

[0116] Reference Figure 10 and Figure 11 The size of the 128' foam net can be smaller than Figure 5 and Figure 6 The foamed mesh 128. Each foamed mesh 128' may partially cover the insulating frame 123F. Except for its dimensions and its position relative to the insulating frame 123F, the foamed mesh 128' and the foamed mesh 128 (see...) Figure 5 They are basically the same.

[0117] According to the embodiment, the foaming net 128' can be connected to the insulating frame 123F in the Y-axis direction with a plurality of pads 122 (see embodiment). Figure 4 The overlapping portion. When assembled into a battery cell assembly, the foamed mesh 128' can overlap with multiple pads 122 (see...) in the Y-axis direction. Figure 4 (overlapping.) Figure 5 and Figure 6 In the Y-axis direction, there are multiple battery cells 121_1 to 121_16 (see... Figure 4 Each overlapping foaming mesh 128 in the structure is different, and the foaming mesh 128' can be connected to multiple battery cells 121_1 to 121_16 in the Y-axis direction (see...). Figure 4 Some of the battery cells overlap.

[0118] Each foaming mesh 128' can be independent of multiple battery cells 121_1 to 121_16 in the Y-axis direction (see...). Figure 4 ) overlap. Each foam mesh 128' can overlap only with multiple pads 122 in the Y-axis direction (see Figure 4 )overlap.

[0119] According to the embodiment, each foaming net 128' can be inserted between slits 123S1 and slits 123S2, therefore the first slit 128S1 and the second slit 128S2 may not be included (see Figure 6 ).

[0120] The present disclosure has been described in more detail above with reference to the accompanying drawings and embodiments. However, the structures shown in the figures or the embodiments described in this specification are merely examples of the present disclosure and do not reflect all the technical ideas of the present disclosure. Therefore, it should be understood that various equivalents and modifications may have been made to replace these structures at the time of filing this application.

Claims

1. A battery cell assembly, the battery cell assembly comprising: A plurality of battery cells are arranged along a first direction, and each battery cell includes electrode leads; An integrated circuit assembly, the integrated circuit assembly being connected to the electrode leads of each of the plurality of battery cells; and A foaming net is inserted between the integrated circuit assembly and the plurality of battery cells.

2. The battery cell assembly according to claim 1, wherein, The foamed mesh includes a mesh and a foamed coating applied to the mesh.

3. The battery cell assembly according to claim 2, wherein, The foamed coating is configured to form a thermal insulation layer in the event of a thermal runaway event in the plurality of battery cells.

4. The battery cell assembly according to claim 1, wherein, The integrated circuit assembly includes an insulating frame and an integrated circuit mounted on the insulating frame, and The foamed mesh is connected to the insulating frame.

5. The battery cell assembly according to claim 4, wherein, The foamed mesh is thermally fused to the insulating frame.

6. The battery cell assembly according to claim 4, wherein, The insulating frame includes a first surface facing the plurality of battery cells, and The foaming net is attached to the first surface.

7. The battery cell assembly according to claim 4, wherein, The insulating frame includes a plurality of first slits, and The foamed mesh includes a second slit that overlaps with the plurality of first slits.

8. The battery cell assembly according to claim 7, wherein, The electrode lead of each of the plurality of battery cells passes through a corresponding slit of the plurality of first slits and second slits.

9. The battery cell assembly according to claim 1, further comprising a pad inserted between the plurality of battery cells. in, The foaming net overlaps with the pad in a second direction perpendicular to the first direction.

10. The battery cell assembly according to claim 9, wherein, The foaming net overlaps with a portion of the battery cells in the second direction.

11. The battery cell assembly according to claim 9, wherein, The foaming net overlaps with each of the plurality of battery cells in the second direction.

12. A battery cell assembly, the battery cell assembly comprising: A plurality of battery cells are arranged along a first direction, and each battery cell includes electrode leads; An integrated circuit assembly, the integrated circuit assembly being connected to the electrode leads of each of the plurality of battery cells; and Multiple foaming nets are inserted between the integrated circuit assembly and the multiple battery cells.

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