Battery module and battery pack

Abstract

Battery module (1) comprising: several cells (10), each of which is provided with a pressure relief valve (111) on one of its top sides; an integrated busbar (20) located on one side of the tops of the multiple cells (10); a fire protection strip (30) which is arranged on a side of the integrated busbar (20) facing away from the cells (10), wherein the fire protection strip (30) is provided with through holes (31) which correspond one-to-one to the pressure relief valves (111).

Description

Technical field

[0001] The present application relates to the field of battery technology, in particular to a battery module and a battery pack. State of the art

[0002] The battery module comprises several cells. In related technology, after a cell experiences thermal runaway, a pressure relief valve opens to release the pressure inside the cell. Disclosure of registration

[0003] However, the conductive materials within the cell, such as electrodes, graphite, and metal particles, are expelled upwards along with the airflow within the cell. These conductive materials can easily cause short circuits in other cells within the battery module, resulting in continuous thermal diffusion.

[0004] The embodiments of the present application provide a battery module. The battery module comprises several cells, an integrated busbar, and a firestop strip. The tops of the cells are provided with pressure relief valves, and the integrated busbar is arranged on one side of the tops of the multiple cells. The firestop strip is arranged on a side of the integrated busbar facing away from the cells, and the firestop strip is provided with through-holes that correspond one-to-one to the pressure relief valves.

[0005] The application further provides a battery pack. The embodiments of the present application provide a battery pack comprising the aforementioned battery module. Beneficial effects

[0006] In the embodiments of the present application, a firestop strip is arranged on a side of the integrated busbar facing away from the cell. The firestop strip is provided with several through-holes that expose the pressure relief valve on the top of the cells. If the cell experiences thermal runaway, the pressure relief valve opens, and the conductive material expelled with gas can be separated by the firestop strip, thereby avoiding the technical problem of continuous thermal diffusion caused by the short circuit of other cells in the battery module, which is caused by contact between the conductive material and the cell and / or the integrated busbar.

[0007] For the battery pack provided in this application, if the cell experiences thermal runaway, the pressure relief valve opens and the conductive material expelled with gas can be separated by the fire protection strip, thereby avoiding the technical problem of continuous thermal diffusion through the short circuit of other cells in the battery module caused by contact between the conductive material and the cell and / or the integrated busbar, and improving the safety of the battery pack. Brief description of the drawings Fig. Figure 1 is a three-dimensional schematic view of a battery module according to the embodiments of the present application; Fig. Figure 2 is a schematic exploded view of a battery module in Fig. 1; Fig. Figure 3 is an enlarged schematic structural view of a cell in Fig. 1; Fig. 4A is a schematic view of a top-down structure of a fire protection strip in Fig. 2; Fig. 4B is another schematic view of a top-down structure of a fire protection strip in Fig. 2; Fig. 5A is a schematic exploded view of a busbar in Fig. 2; Fig. 5B is a schematic top view of a substructure of a battery module in Fig. 1; Fig. Figure 6 is an enlarged schematic structural view of a conductive strip in Fig. 5A; Fig. Figure 7 is an enlarged schematic structural view at position A in Fig. 5A; Fig. Figure 8 is a schematic structural view of a battery pack according to the embodiments of the present application. Reference symbol: Battery module 1;

[0008] Cell 10, housing 12, cover plate assembly 11, pressure relief valve 111, pole 112, first electrode 113, second electrode 114;

[0009] Integrated busbar 20, main busbar 21, conductive strip 211, first subsection 2111, second subsection 2112, first attenuation section 2113, second attenuation section 2114, connecting arm 2115, first busbar end 212, second busbar end 213, bracket 22, groove 221, flexible circuit board 23, connector 231;

[0010] Fire protection strip 30, through hole 31, insulating section 32, weakening structure 34, insulating film 33;

[0011] First direction D1, second direction D2;

[0012] Battery pack 2. Detailed descriptions

[0013] Unless otherwise specified, in this application directional terms such as "top" and "bottom" generally refer to the top and bottom of the device under actual conditions of use or operation, in particular to the directions shown in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0014] In the description of this application, the terms "connected," "connected," and "fastening" should be understood in the broadest sense, unless expressly stated otherwise and limited. Thus, for example, the connection could be permanent, detachable, or a single-piece connection, as well as mechanical or electrical. Furthermore, it could be a direct connection, an indirect connection established via an intermediate piece, an internal connection between two elements, or an interaction between two elements. Those skilled in the art in this field can use the facts as a basis to determine the intended meaning of these terms in the present application.

[0015] In the first aspect, the embodiments of the present application provide a battery module 1, as shown in Fig. 1 to Fig. Figure 3 shows the battery module 1 comprising several cells 10, an integrated busbar 20, and a firestop strip 30. The top of each cell 10 is provided with a pressure relief valve 111, and the integrated busbar 20 is located on one side of the tops of the multiple cells 10. The firestop strip 30 is located on the side of the integrated busbar 20 facing away from the cells 10 and is provided with through-holes 31 that correspond one-to-one to the pressure relief valves 111.

[0016] In the present embodiment, cell 10 can be a cylindrical battery, a square battery, or the like. The description of a cylindrical battery as an example in the accompanying drawings of this application should not be interpreted as a limitation of the present application.

[0017] As in Fig. As shown in Figure 3, the top of the cell 10 refers to an end of the cell 10 that is provided with a cover plate assembly 11. The cell 10 normally comprises a housing 12 which has an opening. The cover plate assembly 11 is arranged corresponding to the opening of the housing 12, and the cover plate assembly 11 forms an enclosed receiving space with the housing 12 to receive a pole piece (not shown in the figure) and other components arranged within the housing 12.

[0018] The top of cell 10 is provided with a pressure relief valve 111. Cell 10 comprises a surface and a bottom surface opposite the surface, and the area connected between the surface and the bottom surface is a side surface. The cover plate assembly 11 is arranged according to the surface of cell 10, and the housing 12 is arranged according to the bottom and side surfaces of cell 10. The pressure relief valve 111 can be positioned on the cover plate assembly 11. If cell 10 experiences thermal runaway, the air pressure inside the housing 12 increases, and the pressure relief valve 111 opens, forming an outlet for gas flow. The conductive substances inside cell 10, such as pole pieces, graphite, and metal particles, are expelled along with the gas through the outlet.After opening the valve, the gas in cell 10 can be released normally, thus preventing the explosion of cell 10 due to internal high pressure.

[0019] The integrated busbar 20 refers to a CCS (Cells Contact System) arrangement. As in Fig. As shown in Figure 2, the integrated busbar 20 is located on one side of the top of cell 10. The integrated busbar 20 is primarily used to connect multiple cells 10 in series and parallel for power output. The integrated busbar 20 can also be used to collect cell voltage data, monitor cell temperatures, and provide a balancing channel, thus ensuring safe and stable operation of the battery module 1.

[0020] As in Fig. 1 and Fig. As shown in Figure 2, the fire protection strip 30 is arranged on the side of the integrated busbar 20 facing away from cell 10. The fire protection strip 30 is provided with several through-holes 31, and one through-hole 31 corresponds to a pressure relief valve 111 of cell 10. The through-holes 31 are configured to expose the pressure relief valves 111. When the pressure relief valve 111 opens, the expelled gas can be ejected from the through-hole 31. By providing through-holes 31 on the fire protection strip 30, it is possible to prevent the fire protection strip 30 from blocking the airflow of the open valve.

[0021] The shape of the fire protection strip 30 does not exceed the shape of the integrated busbar 20, thus preventing the external dimensions of the battery module 1 from increasing due to the arrangement of the fire protection strip 30. Multiple positioning holes can be arranged on the fire protection strip 30, and multiple positioning columns can be arranged on the integrated busbar 20 to facilitate the positioning and mounting of the fire protection strip 30 and the integrated busbar 20.

[0022] The fire protection strip 30 can be made of fire-resistant insulating material. The fire protection strip 30 can separate the conductive substance expelled with the airflow of the open valve, thus preventing the conductive substance from coming into contact with the integrated busbar 20 and / or cell 10 and causing a short circuit in the adjacent cell 10. A short circuit in the adjacent cell 10 causes continuous thermal runaway, leading to the failure of battery module 1.

[0023] The material for fire protection strip 30 can be selected from fire-resistant, high-temperature-resistant, and insulating materials. This not only prevents the conductive substance from coming into contact with the integrated busbar 20 and / or cell 10, which would cause a short circuit in the adjacent cell 10, but also effectively suppresses thermal diffusion and thermal spread from cell 10 after the valve is opened.

[0024] In some embodiments, the fire protection strip 30 can consist of a single-layer or multi-layer composite material. For example, the fire protection strip 30 can be formed by stacking double-sided adhesive tape, fiberglass fabric, and ceramic silicone rubber. The double-sided adhesive tape is used to bond to the integrated busbar 20 and to secure the fire protection strip 30. The fire protection strip 30 can also be made of other fire-resistant insulating materials, and the material of the fire protection strip 30 is not limited in the present application.

[0025] In some embodiments, the fire protection strip 30 can be manufactured from phase-change materials. Phase-change materials can quickly achieve high strength on the outside at high temperatures, while simultaneously creating more micropores in the interior of the material, resulting in a significant decrease in the thermal conductivity and a good thermal insulation effect.

[0026] If the pressure in cell 10 is high, the pressure relief valve 111 can detach from the housing 12 and fall off. The position in which the pressure relief valve 111 falls off is random. If the detached pressure relief valve 111 is connected to the integrated busbar 20 and / or the adjacent cell 10, it causes a short circuit between the cells 10 in the adjacent two through-holes 31 and / or the integrated busbar 20, resulting in a continuous thermal diffusion phenomenon.

[0027] In response to this, as in Fig. As shown in Figure 4A, in some embodiments an insulating section 32 is provided within the through-hole 31 of the fire protection strip 30, so that the insulating material within the through-hole 31 can allow the pressure relief valve 111 to be disconnected, thereby preventing the falling pressure relief valve 111 from causing a short circuit between the cells 10 in adjacent two through-holes 31 and / or the integrated busbar 20.

[0028] In some embodiments, such as in Fig. As shown in Figure 4A, the insulating section 32 is connected to the fire-resistant strip 30 by a weakening structure 34. The insulating section 32 within the through-hole 31 can be made of the same material as the fire-resistant strip 30. The above-mentioned configuration allows the insulating section 32 to be integrally molded with the fire-resistant strip 30, thus simplifying the manufacturing process of the insulating section 32.

[0029] The mechanical strength of the weakening structure 34 is lower than that of the fire protection strip 30 and the insulating section 32. When the pressure relief valve 111 is opened, the airflow from the open valve can cause the weakening structure 34 to break, thereby separating the insulating section 32 from the fire protection strip 30.

[0030] Optionally, as in Fig. As shown in Figure 4A, the weakening structure 34 is a connecting rib, and the number of connecting ribs can be multiple. The multiple connecting ribs are arranged at intervals along the edges of the insulating sections 32. The multiple connecting ribs are distributed along a circumferential direction of the through-hole 31 and connect the edges of the insulating sections 32 to the side walls of the through-holes 31. It should be noted that the number and size of the connecting ribs can be adjusted as required, as long as it is ensured that the connecting ribs can be broken by the expelled airflows when the valve opens.

[0031] In some embodiments, the weakening structure 34 can be a notch, and the insulating section 32 and the fire-resistant strip 30 are connected by several notches. The material at the notch is relatively weak and can be broken by the expelled airflow when the valve opens. The shape of the notch can be adjusted as required so that, upon breakage of the notch, the insulating section 32 separates from the fire-resistant strip 30.

[0032] Due to the weak connection between the insulating section 32 and the fire protection strip 30, when the pressure relief valve 111 opens, the impact force of the airflow can cause the weakening structure 34 to separate, thus preventing the insulating section 32 from obstructing the airflow. The detachable pressure relief valve 111 can be separated by the insulating section 32, thereby preventing short circuits between the cells 10 in adjacent two through-holes 31 and / or the integrated busbar 20 caused by the detachable pressure relief valve 111.

[0033] In one embodiment as in Fig. As shown in Figure 4B, an insulating film 33 is provided on a side surface of the fire-resistant strip 30. The insulating film 33 covers each through-hole 31. The thickness of the insulating film 33 is less than that of the fire-resistant strip 30. The insulating film 33 can be bonded to the fire-resistant strip 30. The material for the insulating film 33 can be the same as or different from that of the fire-resistant strip 30. The insulating film 33 can be a fire-resistant, high-temperature-resistant, and insulating material that, on the one hand, can provide an insulating effect and, on the other hand, can separate the airflow from the open valve from other cells 10 not exposed to thermal penetration, thus preventing the other cells 10 not exposed to thermal penetration from being affected and failing due to the high-temperature airflow.

[0034] The thickness of the insulating film 33 is less than that of the fire protection strip 30. The thickness of the insulating film 33 can be adjusted as required, as long as it is ensured that the insulating film 33 can be broken by the expelled airflow when the valve is opened.

[0035] When the pressure relief valve 111 opens, the insulating film 33 can be ruptured by the impact force of the airflow, thus preventing the insulating film 33 from obstructing the airflow. The detachable pressure relief valve 111 can be separated by the insulating film 33, thereby preventing short circuits between the cells 10 in adjacent two through-holes 31 and / or the integrated busbars 20 caused by the detachable pressure relief valve 111.

[0036] In some embodiments, the insulating film 33 can be a single thin film. If the insulating film 33 is a single thin film, the processing of the insulating film 33 is relatively simple.

[0037] In some embodiments, the insulating film 33 can further comprise several independent insulating sections, one insulating section being arranged according to a through-hole 31.

[0038] In one embodiment as in Fig. As shown in Figure 3, the cell 10 comprises a housing 12 and a cover plate assembly 11. The cover plate assembly 11 forms a closed structure with the housing 12, and the cover plate assembly 11 includes a pole 112 and a pressure relief valve 111. The cover plate assembly 11 is provided with a notch to form the pressure relief valve 111, and the notch is arranged around the pole 112.

[0039] In this embodiment, the housing 12 can be made of metallic materials such as aluminum, copper, etc. The notch can take the form of a groove, cut, etc. Since the thickness at the notch is less than at other locations, when the pressure inside cell 10 reaches the threshold upon opening the valve, the notch tears to facilitate pressure relief. The notch is a closed shape that surrounds pole 112, so that when the valve opens, the pressure relief valve 111 can fall out together with pole 112.

[0040] The pressure relief valve 111 is isolated from pole 112 and connected to it. For example, a sealing ring is provided between the pressure relief valve 111 and pole 112 to ensure a connection and seal. When the pressure relief valve 111 closes, pole 112 closes along with the pressure relief valve 111. This short-circuits the circuit of cell 10, preventing the thermal runaway of cell 10 from affecting other cells 10.

[0041] For example, as in Fig. Figure 3 shows the pressure relief valve 111 arranged coaxially with the pole 112. The pressure relief valve 111 has an annular shape, and the pole 112 is arranged corresponding to the central area of ​​the annular shape of the pressure relief valve 111.

[0042] In one embodiment as in Fig. As shown in Figure 3, the cover plate assembly 11 comprises a first electrode 113 and a second electrode 114, which are arranged on the same end face of the cell 10 as the pressure relief valve 111. The first electrode 113 is arranged around the pressure relief valve 111, the pressure relief valve 111 is arranged around the second electrode 114, and the outer edge of the first electrode 113 is connected to the housing 12. The inner edge of the first electrode 113 is connected to the pressure relief valve 111, and the second electrode 114 is connected to the pole 112. When the pressure relief valve 111 detaches, the second electrode 114 and the pole 112 detach together with the pressure relief valve 111.

[0043] One of the first electrodes 113 and the second electrode 114 can be a positive electrode and the other a negative electrode. For example, the first electrode 113 can be a negative electrode and the second electrode 114 a positive electrode. The first electrode 113 is arranged around the pressure relief valve 111 and can also have an annular shape. The first electrode 113 is arranged coaxially with the pole 112.

[0044] The inner edge of the first electrode 113 is connected to the pressure relief valve 111, and the outer edge of the first electrode 113 is connected to the housing 12. The inner edge of the first electrode 113 corresponds to the inner edge of the annular ring of the first electrode 113, and the outer edge of the first electrode 113 corresponds to the outer edge of the annular ring of the second electrode 114. The second electrode 114 is connected to pole 112; for example, the second electrode 114 can be welded to pole 112. Due to the above configuration, the first electrode 113, the second electrode 114, and the pressure relief valve 111 can all be located at one end of the housing 12, thus simplifying the structure of the cell 10 and reducing the complexity of the process.

[0045] In one embodiment, the pressure relief valve 111 is connected to the second electrode 114.

[0046] In one embodiment as in Fig. 5A, Fig. 5B und Fig. As shown in Figure 6, the integrated busbar 20 comprises a main busbar 21, which includes several conductive strips 211 arranged along a first direction. The conductive strips 211 are connected in series with several cells 10. The conductive strips 211 comprise a first subsection 2111, which is connected to the first electrode 113, a second subsection 2112, which is connected to the second electrode 114, and a first attenuation section 2113, which connects the first subsection 2111 and the second subsection 2112. The second subsection 2112 and at least a portion of the first attenuation section 2113 are exposed through the through-hole 31. The cross-sectional areas of the first subsection 2111 and the second subsection 2112 are both larger than a cross-sectional area of ​​the first weakening section 2113, and the second subsection 2112 is connected to the second electrode 114.

[0047] As in Fig. 5A und Fig. As shown in Figure 5B, the integrated busbar 20 comprises a main busbar 21, which is used to achieve series and parallel connections of several cells 10 for current output. Specifically, the main busbar 21 comprises a second busbar end 213, several conductive strips 211, and a first busbar end 212 arranged sequentially along the first direction D1. If the first electrode 113 is a negative electrode and the second electrode 114 is a positive electrode, the second busbar end 213 can be used to output a positive voltage, and the first busbar end 212 can be used to output a negative voltage. The main busbar 21 is used for the two adjacent cells 10 connected in series in the first direction D1 and the two adjacent cells 10 connected in parallel in the second direction D2.The first direction D1 is a longitudinal direction of the main busbar 21 and the second direction D2 is a transverse direction of the main busbar 21.

[0048] As in Fig. 5B and Fig. As shown in Figure 6, each conductive strip 211 comprises several first subsections 2111 and several second subsections 2112. The first subsection 2111 is connected to the first electrode 113, and the second subsection 2112 is connected to the second electrode 114. The first electrode 113 and the second electrode 114 cannot be located in the same horizontal plane. For example, the plane in which the second electrode 114 is located can be higher than the plane in which the first electrode 113 is located, thus preventing a short circuit of the main busbar 21 when connecting the first electrode 113 and the second electrode 114.

[0049] A first attenuation section 2113 is provided between the first subsection 2111 and the second subsection 2112. The cross-sectional area of ​​the first attenuation section 2113 is smaller than that of the first subsection 2111, and the cross-sectional area of ​​the first attenuation section 2113 is smaller than that of the second subsection 2112. The cross-sectional area is perpendicular to the direction of the current in the conductive strip 211.

[0050] The material of the main busbar 21 can be metals such as aluminum and copper. Due to the small cross-sectional area of ​​the first attenuation section 2113, when cell 10 experiences thermal runaway, the current in the first attenuation section 2113 corresponding to cell 10 increases, leading to the melting of the first attenuation section 2113. The first attenuation section 2113 is equivalent to a fuse and is used to isolate the cell 10 that has experienced thermal runaway from the series-connected circuit, thus preventing the effect of the thermally runaway cell 10 on other cells 10.

[0051] In one embodiment, the conductive strips 211 comprise a second weakening section 2114 that connects two adjacent second subsections 2112, and the second weakening section 2114 is exposed through the through-hole 31. A cross-sectional area of ​​the second subsection 2112 is larger than a cross-sectional area of ​​the second weakening section 2114.

[0052] A conductive strip 211 comprises several second attenuation sections 2114 that connect two adjacent cells 10 along the second direction D2. At least two second attenuation sections 2114 are provided between two adjacent cells 10, and each of the two second attenuation sections 2114 is used to isolate one of the cells 10. The second attenuation section 2114 is also equivalent to a fuse, and its operating principle is similar to that of the first attenuation section 2113. The difference is that if thermal runaway occurs in cell 10, the first attenuation section 2113 melts, while the second attenuation section 2114 does not melt. If a short circuit occurs in the integrated busbar 20, the second attenuation section 2114 melts.This means that although the first weakening section 2113 can be melted down in time if cell 10 experiences thermal runaway, cell 10 experiencing thermal runaway cannot be isolated from several parallel-connected cells 10, which can easily cause continuous thermal runaway.

[0053] In response, a second attenuation section 2114 is provided on the conductive strip 211, and both the first attenuation section 2113 and the second attenuation section 2114 are exposed through the through-hole 31. When the pressure relief valve 111 is opened, the second attenuation section 2114 can be separated under the impact force of the expelled gas, thereby isolating the cell 10 experiencing thermal runaway from several parallel-connected cells 10, in order to further reduce the influence of the thermally runaway cell 10 on other cells 10. In this way, the thermally runaway cell 10 can be isolated from the parallel-connected circuits in a timely manner, even though no short circuit occurs in the integrated busbar 20.

[0054] The second subsection 2112 and at least part of the first weakening section 2113 are exposed through the through-hole 31. If cell 10 experiences thermal runaway, pole 112, the second subsection 2112, and the pressure relief valve 111 detach together and are then ejected from the through-hole 31 with the airflow when the valve opens. This ensures that the pressure relief valve 111 of cell 10 opens normally and that the gas inside cell 10 can be vented normally, thus preventing an explosion and detonation of cell 10.

[0055] In one embodiment as in Fig. 2, Fig. 5A, Fig. 5B and Fig. As shown in Figure 7, the integrated busbar 20 includes a support 22 located between the main busbar 21 and cell 10. The support 22 serves to carry the main busbar 21. The conductive strip 211 includes a connecting arm 2115. The two ends of the connecting arm 2115 are each connected to a second attenuating section 2114. The support 22 has a groove 221, and the connecting arm 2115 is positioned in this groove 221.

[0056] As in Fig. 5A and Fig. As shown in Figure 5B, a support groove is provided on one of the side surfaces of the bracket 22 facing the main busbar 21. This groove is used to receive the main busbar 21. Several openings are also provided on the bracket 22, exposing the top surfaces of the respective cells 10. The main busbar 21 passes through the openings and is electrically connected to the cells 10. In particular, the first section 2111 is electrically connected to the first electrode 113, and the second section 2112 is electrically connected to the second electrode 114.

[0057] As in Fig. 5B and Fig. As shown in Figure 6, the conductive strip 211 comprises several connecting arms 2115 that connect two adjacent cells 10 along the second direction D2. The two ends of the connecting arm 2115 are each provided with a second weakening section 2114. If the second weakening sections 2114 at both ends of the connecting arm 2115 are broken by the airflow when the valve opens, the connecting arm 2115 falls between the two adjacent cells 10, which can easily cause the casings 12 of the two adjacent cells 10 to conduct and create a short circuit in the circuits.

[0058] In response, a groove 221 corresponding to the connecting arm 2115 can be arranged on the bracket 22. If the connecting arm 2115 falls off, it is supported by the underside of the groove 221 and cannot fall off between two adjacent cells 10.

[0059] The integrated busbar 20 can also include a flexible printed circuit board 23 for acquiring and transmitting voltage data. The flexible printed circuit board 23 is arranged on a side face of the bracket 22 facing away from the cell 10 and is located at the edge of the bracket 22. The flexible printed circuit board 23 can be connected to the main busbar 21 via several connectors 231. One end of the connector 231 is connected to the edge of the flexible printed circuit board 23, and the other end is connected to the main busbar 21. The material of the connector 231 can be nickel or a similar material, but is not limited to this. One connector 231 is connected to the first busbar end 212 accordingly, and the other connector 231 is connected to the second busbar end 213 accordingly. Several connectors 231 are connected to several conductive strips 211 in a one-to-one correspondence.The above-mentioned settings can make grouping the integrated busbar 20 easier and increase production efficiency.

[0060] In one embodiment, the pressure relief valve 111 is annular and the through-hole 31 is a circular hole. The diameter of the through-hole 31 is larger than the outer diameter of the pressure relief valve 111 and smaller than the outer diameter of the cell 10. The diameter of the through-hole 31 is larger than the outer diameter of the pressure relief valve 111 so that the pressure relief valve 111 can pass through the through-hole 31.

[0061] The diameter of the through-hole 31 is smaller than the outer diameter of the cylindrical cell 10, so that the fire protection strip 30 can at least cover the gap between two adjacent cells 10, thus preventing a conductor in the ejected airflow from falling between two adjacent cells 10 when the pressure relief valve 111 is opened and causing a short circuit.

[0062] Optionally, cell 10 can be a cylindrical battery or a square battery, but is not limited to either.

[0063] In the second aspect, as in Fig. As shown in Figure 8, the embodiments of the present application provide a battery pack 2 comprising the aforementioned battery module 1.

[0064] In this embodiment, the battery pack 2 can comprise several battery modules 1 and a battery box, with several battery modules being placed inside the battery box.

Claims

[1] Battery module (1) comprising: several cells (10), each of which is provided with a pressure relief valve (111) on one of its top sides; an integrated busbar (20) located on one side of the tops of the multiple cells (10); a fire protection strip (30) which is arranged on a side of the integrated busbar (20) facing away from the cells (10), wherein the fire protection strip (30) is provided with through holes (31) which correspond one-to-one to the pressure relief valves (111). [2] Battery module (1) according to claim 1, wherein an insulating section (32) is provided within the through-hole (31), and an edge of the insulating section (32) is connected to a side wall of the through-hole (31) by a weakening structure (34). [3] Battery module (1) according to claim 2, wherein the weakening structure (34) comprises several connecting ribs arranged at intervals along the edges of the insulating sections (32). [4] Battery module (1) according to any one of claims 1 to 3, wherein a side surface of the fire protection strip (30) is provided with an insulating film (33) covering each through hole (31), and the thickness of the insulating film (33) is less than the thickness of the fire protection strip (30). [5] Battery module (1) according to any one of claims 1 to 4, wherein the pressure relief valve (111) has an annular shape, the through-hole (31) is a circular hole, and the diameter of the through-hole (31) is larger than the outer diameter of the pressure relief valve (111) and smaller than the outer diameter of the cell (10). [6] Battery module (1) according to any one of claims 1 to 5, wherein the cell (10) comprises a first electrode (113) and a second electrode (114) arranged on the same end face of the cell (10) as the pressure relief valve (111), wherein the first electrode (113) is arranged around the pressure relief valve (111) and the pressure relief valve (111) is arranged around the second electrode (114). [7] Battery module (1) according to claim 6, wherein the pressure relief valve (111) is connected to the second electrode (114). [8] Battery module (1) according to claim 6 or 7, wherein the integrated busbar (20) comprises a main busbar (21), the main busbar (21) comprising several conductive strips (211) arranged along a first direction, the conductive strips (211) being connected in series with several cells (10), the conductive strips (211) comprising a first subsection (2111) connected to the first electrode (113), a second subsection (2112) connected to the second electrode (114), and a first attenuation section (2113) connecting the first subsection (2111) and the second subsection (2112), the second subsection (2112) and at least a part of the first attenuation section (2113) being exposed through the through-hole (31),wherein the cross-sectional areas of the first sub-section (2111) and the second sub-section (2112) are both larger than a cross-sectional area of ​​the first weakening section (2113). [9] Battery module (1) according to claim 8, wherein the conductive strips (211) comprise a second weakening section (2114) connecting two adjacent second subsections (2112), and the second weakening section (2114) is exposed through the through hole (31), wherein a cross-sectional area of ​​the second subsection (2112) is larger than a cross-sectional area of ​​the second weakening section (2114). [10] Battery module (1) according to claim 9, wherein the integrated busbar (20) comprises a support (22) arranged between the main busbar (21) and the cell (10), wherein the support (22) is configured to support the main busbar (21), and the conductive strips (211) comprise a connecting arm (2115), wherein both ends of the connecting arm (2115) are each connected to a second weakening section (2114), wherein the support (22) is provided with a groove (221) and a connecting arm (2115) is arranged in the groove (221). [11] Battery pack (2) comprising the battery module (1) according to any one of claims 1 to 10.

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