Battery module and battery pack

Abstract

The present application provides a battery module and a battery pack. The battery module comprises a plurality of battery cells, an integrated busbar, and a fireproof strip. A pressure relief valve is disposed at the top of each battery cell. The integrated busbar is disposed on the top side of the plurality of battery cells. The fireproof strip is disposed on a side of the integrated busbar located away from the battery cells. The fireproof strip is provided with through-holes in one-to-one correspondence with the pressure relief valves.

Description

A battery module and battery pack

[0001] This application claims priority to Chinese Patent Application No. 202411599716.8, filed on November 8, 2024, and Chinese Patent Application No. 202422737929.4, filed on November 8, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, specifically to a battery module and battery pack. Background Technology

[0003] A battery module comprises multiple battery cells. In related technologies, after a battery cell experiences thermal runaway, its pressure relief valve opens to release the internal pressure of the battery cell. Invention Overview

[0004] However, conductive materials inside the battery cell, such as electrodes, graphite, and metal particles, can be ejected upwards by the airflow within the cell. These conductive materials can easily cause short circuits in other battery cells within the battery module, leading to continuous heat dissipation.

[0005] An embodiment of this application provides a battery module. The battery module includes multiple battery cells, an integrated busbar, and a fireproof strip. A pressure relief valve is provided on the top of each battery cell. The integrated busbar is located on one side of the top of the multiple battery cells. The fireproof strip is located on the side of the integrated busbar away from the battery cells. The fireproof strip has through holes corresponding to the pressure relief valves.

[0006] This application also provides a battery pack. Embodiments of this application provide a battery pack including the battery module described above. Beneficial effects

[0007] In the embodiments of this application, a fireproof strip is provided on the side of the integrated busbar away from the battery cell. The fireproof strip has multiple through holes, which expose the pressure relief valve on the top of the battery cell. When the battery cell experiences thermal runaway, the pressure relief valve opens, and the conductive material ejected with the gas can be separated by the fireproof strip. This prevents the conductive material from contacting the battery cell and / or the integrated busbar, which could lead to short circuits in other battery cells within the battery module and cause continuous thermal diffusion.

[0008] The battery pack provided in this application, when a battery cell experiences thermal runaway, opens the pressure relief valve, and the conductive material ejected with the gas can be separated by a fireproof strip, preventing the conductive material from contacting the battery cell and / or integrated busbar, which could lead to short circuits in other battery cells within the battery module and cause continuous thermal diffusion, thus improving the safety of the battery pack. Attached Figure Description

[0009] Figure 1 is a perspective view of the battery module provided in an embodiment of this application;

[0010] Figure 2 is an exploded view of the battery module in Figure 1;

[0011] Figure 3 is an enlarged structural schematic diagram of the battery cell in Figure 1;

[0012] Figure 4A is a top view of one of the fireproof structures in Figure 2;

[0013] Figure 4B is another top view of the firebreak structure in Figure 2;

[0014] Figure 5A is an exploded view of the integrated busbar in Figure 2;

[0015] Figure 5B is a top view of a partial structure of the battery module in Figure 1;

[0016] Figure 6 is an enlarged schematic diagram of the flow guide in Figure 5A;

[0017] Figure 7 is an enlarged structural diagram of point A in Figure 5A;

[0018] Figure 8 is a schematic diagram of the battery pack provided in an embodiment of this application.

[0019] Explanation of reference numerals in the attached figures:

[0020] Battery module 1;

[0021] Battery cell 10, housing 12, cover assembly 11, pressure relief valve 111, terminal post 112, first electrode 113, second electrode 114;

[0022] Integrated busbar 20, busbar 21, guide busbar 211, first sub-section 2111, second sub-section 2112, first weak section 2113, second weak section 2114, connecting arm 2115, first busbar end 212, second busbar end 213, bracket 22, groove 221, flexible circuit board 23, connecting piece 231;

[0023] Fireproof strip 30, through hole 31, insulation part 32, weak structure 34, insulation film 33;

[0024] First direction D1, second direction D2;

[0025] Battery pack 2. Embodiments of the present invention

[0026] In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the orientation shown in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0027] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] In a first aspect, embodiments of this application provide a battery module 1, as shown in Figures 1 to 3. The battery module 1 includes multiple battery cells 10, an integrated busbar 20, and a fireproof strip 30. A pressure relief valve 111 is provided on the top of each battery cell 10. The integrated busbar 20 is located on one side of the top of the multiple battery cells 10. The fireproof strip 30 is located on the side of the integrated busbar 20 away from the battery cells 10. The fireproof strip 30 is provided with through holes 31 that correspond one-to-one with the pressure relief valve 111.

[0029] In this embodiment, the battery cell 10 can be a cylindrical battery, a prismatic battery, etc. The accompanying drawings of this application use a cylindrical battery as an example for illustration and should not be construed as limiting the scope of this application.

[0030] As shown in Figure 3, the top of the battery cell 10 refers to the end of the battery cell 10 where the cover assembly 11 is provided. The battery cell 10 typically includes a housing 12 with an opening. The cover assembly 11 is provided corresponding to the opening of the housing 12, and the cover assembly 11 and the housing 12 form a sealed receiving space to accommodate electrode sheets (not shown in the figure) and other materials disposed inside the housing 12.

[0031] A pressure relief valve 111 is provided on the top of the battery cell 10. The battery cell 10 includes a top surface and a bottom surface arranged opposite each other, with the surface connecting the top and bottom surfaces being a side surface. A cover plate assembly 11 is provided corresponding to the top surface of the battery cell 10, and a housing 12 is provided corresponding to the bottom and side surfaces of the battery cell 10. The pressure relief valve 111 can be provided on the cover plate assembly 11. When the battery cell 10 experiences thermal runaway, the gas pressure inside the housing 12 increases, and the pressure relief valve 111 opens, forming an outlet for gas flow. Conductive materials inside the battery cell 10, such as electrode sheets, graphite, and metal particles, are ejected from the outlet along with the gas. After the valve opens, the gas in the battery cell 10 can be discharged normally, preventing the battery cell 10 from exploding due to internal high pressure.

[0032] The integrated busbar 20 refers to the CCS (Cells Contact System) assembly. As shown in Figure 2, the integrated busbar 20 is located on one side of the top of the battery cell 10. The integrated busbar 20 is mainly used to realize the series and parallel connection of multiple battery cells 10 to output current. The integrated busbar 20 can also be used to collect the voltage data of the cells, monitor the temperature of the cells, and provide a balancing channel to ensure the safe and stable operation of the battery module 1.

[0033] As shown in Figures 1 and 2, the fireproof strip 30 is located on the side of the integrated busbar 20 away from the battery cell 10. The fireproof strip 30 has multiple through holes 31, each corresponding to a pressure relief valve 111 of one battery cell 10, with the through holes 31 exposing the pressure relief valve 111. When the pressure relief valve 111 is opened, the ejected gas can be released through the through holes 31. By providing through holes 31 on the fireproof strip 30, the fireproof strip 30 can be prevented from obstructing the airflow when the valve is opened.

[0034] The shape of the fireproof strip 30 does not exceed the shape of the integrated busbar 20, thus avoiding increasing the size of the battery module 1 due to the installation of the fireproof strip 30. The fireproof strip 30 can be provided with multiple positioning holes, and the integrated busbar 20 can be provided with multiple positioning posts, thereby realizing the positioning and assembly of the fireproof strip 30 and the integrated busbar 20.

[0035] The fireproof strip 30 can be made of fire-resistant and insulating material. The fireproof strip 30 can isolate conductive material ejected with the valve-opening airflow, preventing the conductive material from contacting the integrated busbar 20 and / or battery cells 10 and causing short circuits in adjacent battery cells 10. Short circuits in adjacent battery cells 10 can cause continuous thermal runaway, leading to the failure of the battery module 1.

[0036] The fireproof strip 30 can be made of fire-resistant, high-temperature resistant, and insulating materials. This not only prevents conductive materials from contacting the integrated busbar 20 and / or battery cells 10, thus preventing short circuits in adjacent battery cells 10, but also effectively suppresses heat diffusion and heat spread after the battery cells 10 open their valves.

[0037] In some embodiments, the fireproof strip 30 may be composed of a single layer or multiple layers of materials. For example, the fireproof strip 30 may be composed of double-sided adhesive, fiberglass cloth, and ceramic silicone rubber layers. The double-sided adhesive is used to bond with the integrated busbar 20 to fix the fireproof strip 30. The fireproof strip 30 may also be made of other fireproof and insulating materials; this application does not limit the material of the fireproof strip 30.

[0038] In some embodiments, the fireproof strip 30 can be made of a phase change material. At high temperatures, the surface of the phase change material can quickly acquire high strength, while at the same time, more micropores are generated inside the material, and the thermal conductivity drops sharply, achieving a better heat insulation effect.

[0039] When the pressure inside the battery cell 10 is high, the pressure relief valve 111 may detach from the housing 12 and fall off. The location where the pressure relief valve 111 falls off is random. When the fallen pressure relief valve 111 connects to the integrated busbar 20 and / or an adjacent battery cell 10, it will cause a short circuit between the battery cell 10 and / or the integrated busbar 20 in two adjacent through holes 31, triggering continuous heat diffusion.

[0040] In response to this, as shown in Figure 4A, in some embodiments, an insulating part 32 is provided in the through hole 31 of the fireproof strip 30, so that the insulating material in the through hole 31 can separate the pressure relief valve 111 and prevent the falling pressure relief valve 111 from causing a short circuit between the battery cells 10 and / or the integrated busbar 20 in two adjacent through holes 31.

[0041] In some embodiments, as shown in FIG4A, the insulating part 32 and the fireproof strip 30 are connected by a weak structure 34. The insulating part 32 in the through hole 31 can be made of the same material as the fireproof strip 30. With the above arrangement, the insulating part 32 and the fireproof strip 30 can be integrally formed, simplifying the manufacturing process of the insulating part 32.

[0042] The mechanical strength of the weak structure 34 is less than that of the fireproof strip 30 and the insulation part 32. When the pressure relief valve 111 is opened, the airflow can cause the weak structure 34 to rupture, thereby separating the insulation part 32 from the fireproof strip 30.

[0043] Optionally, as shown in Figure 4A, the weak structure 34 can be a connecting rib. There can be multiple connecting ribs, distributed circumferentially along the through hole 31, connecting the edge of the insulating part 32 to the sidewall of the through hole 31. It should be noted that the number and size of the connecting ribs can be set as needed, as long as it is ensured that the connecting ribs can be broken by the ejected airflow when the valve is opened.

[0044] In some embodiments, the weak structure 34 can be a notch, and the insulating part 32 and the fireproof strip 30 are connected by multiple notches. The material at the notch is thinner and can be broken by the airflow when the valve is opened. The shape of the notch can be set as needed so that when the notch breaks, the insulating part 32 separates from the fireproof strip 30.

[0045] Because the connection between the insulation part 32 and the fireproof strip 30 is weak, when the pressure relief valve 111 is opened, the impact force of the airflow can break the weak structure 34, thereby preventing the insulation part 32 from obstructing the airflow. The fallen pressure relief valve 111 can be separated by the insulation part 32, thereby preventing the fallen pressure relief valve 111 from causing a short circuit between the battery cells 10 and / or the integrated busbar 20 in the two adjacent through holes 31.

[0046] In one embodiment, as shown in FIG4B, an insulating film 33 is provided on one side surface of the fireproof strip 30, covering each through hole 31. The thickness of the insulating film 33 is less than the thickness of the fireproof strip 30. The insulating film 33 can be bonded to the fireproof strip 30. The material of the insulating film 33 can be the same as or different from the material of the fireproof strip 30. The insulating film 33 can be a fireproof, high-temperature resistant, and insulating material, thereby achieving an insulating effect on the one hand, and isolating the airflow from the valve opening from other non-thermal runaway battery cells 10 on the other hand, preventing other non-thermal runaway battery cells 10 from being affected by the high-temperature airflow and failing.

[0047] The thickness of the insulating film 33 is less than the thickness of the fireproof strip 30. The thickness of the insulating film 33 can be set as needed, as long as it can be broken by the airflow when the valve is opened.

[0048] When the pressure relief valve 111 is opened, the impact force of the airflow can break through the insulating membrane 33, thereby preventing the insulating membrane 33 from obstructing the airflow. The fallen pressure relief valve 111 can be separated by the insulating membrane 33, thereby preventing the fallen pressure relief valve 111 from causing a short circuit between the battery cells 10 and / or the integrated busbar 20 in the two adjacent through holes 31.

[0049] In some embodiments, the insulating film 33 can be a single sheet of film. When the insulating film 33 is a single sheet of film, the processing technology of the insulating film 33 is relatively simple.

[0050] In some embodiments, the insulating film 33 may also include a plurality of independent insulator portions, with one insulator portion corresponding to a through hole 31.

[0051] In one embodiment, as shown in FIG3, the battery cell 10 includes a housing 12 and a cover assembly 11. The cover assembly 11 and the housing 12 form a sealed structure. The cover assembly 11 includes a terminal post 112 and a pressure relief valve 111. The cover assembly 11 is provided with grooves to form the pressure relief valve 111. The grooves are provided around the terminal post 112.

[0052] In this embodiment, the housing 12 can be made of a metallic material, such as aluminum or copper. The grooves can be in the form of recesses or cuts. Since the thickness at the groove is less than the thickness at other locations, when the pressure inside the battery cell 10 reaches the valve opening threshold, the groove will rupture to facilitate pressure relief. The groove is a closed pattern surrounding the terminal post 112, so that when the valve is opened, the pressure relief valve 111 can detach together with the terminal post 112.

[0053] The pressure relief valve 111 is insulated from and connected to the terminal 112. For example, a sealing ring is provided between the pressure relief valve 111 and the terminal 112 to achieve connection and sealing between the pressure relief valve 111 and the terminal 112. When the pressure relief valve 111 falls off, the terminal 112 falls off along with the pressure relief valve 111. This can disconnect the current circuit of the battery cell 10, preventing the thermal runaway battery cell 10 from affecting other battery cells 10.

[0054] For example, as shown in Figure 3, the pressure relief valve 111 and the pole post 112 are coaxially arranged. The pressure relief valve 111 is in the shape of a ring, and the pole post 112 is arranged in the central area of ​​the ring of the pressure relief valve 111.

[0055] In one embodiment, as shown in FIG3, the cover plate assembly 11 includes a first electrode 113 and a second electrode 114. The first electrode 113 is disposed around the pressure relief valve 111, with its outer edge connected to the housing 12 and its inner edge connected to the pressure relief valve 111. The second electrode 114 is connected to the electrode post 112. When the pressure relief valve 111 detaches, the second electrode 114 and the electrode post 112 detach together with the pressure relief valve 111.

[0056] One of the first electrode 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 can be a positive electrode. The first electrode 113 is arranged around the pressure relief valve 111, and the first electrode 113 can also be in a ring shape. The first electrode 113 is coaxially arranged with the pole post 112.

[0057] 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 annulus of the first electrode 113, and the outer edge of the first electrode 113 corresponds to the outer edge of the annulus of the second electrode 114. The second electrode 114 is connected to the terminal post 112; for example, the second electrode 114 can be welded to the terminal post 112. With this arrangement, 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, thereby simplifying the structure of the battery cell 10 and reducing manufacturing complexity.

[0058] In one embodiment, as shown in Figures 5A, 5B and 6, the integrated busbar 20 includes a busbar 21, which includes a plurality of guide bars 211 arranged along a first direction. The guide bars 211 are connected in series with a plurality of battery cells 10. The guide bars 211 include a first sub-part 2111 connected to a first electrode 113, a second sub-part 2112 connected to a second electrode 114, and a first weak part 2113 connecting the first sub-part 2111 and the second sub-part 2112. A through hole 31 exposes the second sub-part 2112 and at least part of the first weak part 2113.

[0059] As shown in Figures 5A and 5B, the integrated busbar 20 includes a busbar 21, which is used to connect multiple battery cells 10 in series and parallel to output current. Specifically, the busbar 21 includes a second bus terminal 213, multiple current-conducting channels 211, and a first bus terminal 212 arranged sequentially along a first direction D1. When the first electrode 113 is the negative electrode and the second electrode 114 is the positive electrode, the second bus terminal 213 can be used to output a positive voltage, and the first bus terminal 212 can be used to output a negative voltage. The busbar 21 is used to connect two adjacent battery cells 10 in series in the first direction D1 and two adjacent battery cells 10 in parallel in the second direction D2. The first direction D1 is the length direction of the busbar 21, and the second direction D2 is the width direction of the busbar 21.

[0060] As shown in Figures 5B and 6, each busbar 211 includes multiple first sub-sections 2111 and multiple second sub-sections 2112. The first sub-sections 2111 are connected to the first electrode 113, and the second sub-sections 2112 are connected to the second electrode 114. The first electrode 113 and the second electrode 114 may not be on the same horizontal plane. For example, the plane containing the second electrode 114 may be higher than the plane containing the first electrode 113, thereby preventing the busbar 21 from short-circuiting when connecting the first electrode 113 and the second electrode 114.

[0061] A first weak portion 2113 is provided between the first sub-part 2111 and the second sub-part 2112. The cross-sectional area of ​​the first weak portion 2113 is smaller than that of the first sub-part 2111, and the cross-sectional area of ​​the first weak portion 2113 is smaller than that of the second sub-part 2112. The cross-section of the first weak portion 2113 is perpendicular to the current direction in the current guide 211.

[0062] The busbar 21 can be made of metals such as aluminum or copper. Because the cross-sectional area of ​​the first weak point 2113 is small, when a battery cell 10 experiences thermal runaway, the current in the first weak point 2113 corresponding to the battery cell 10 increases, causing the first weak point 2113 to melt. The first weak point 2113 acts like a fuse, disconnecting the thermally runaway battery cell 10 from the series circuit to prevent it from affecting other battery cells 10.

[0063] In one embodiment, the flow guide 211 includes a second weak portion 2114, which connects two adjacent second sub-parts 2112, and the through hole 31 exposes the second weak portion 2114.

[0064] A busbar 211 includes multiple second weak points 2114. Each second weak point 2114 connects two adjacent battery cells 10 along the second direction D2. At least two second weak points 2114 are provided between two adjacent battery cells 10, and each second weak point 2114 is used to disconnect one of the battery cells 10. The second weak point 2114 also functions as a fuse, and its working principle is similar to that of the first weak point 2113. The difference is that when a battery cell 10 experiences thermal runaway, the first weak point 2113 melts, but the second weak point 2114 does not melt. The second weak point 2114 only melts when a short circuit occurs in the integrated busbar 20. This means that although the first weak point 2113 can melt in time when a battery cell 10 experiences thermal runaway, it cannot disconnect the thermally runaway battery cell 10 from the multiple parallel battery cells 10, which can easily lead to continuous thermal runaway.

[0065] To address this, a second weak point 2114 is provided on the flow guide 211, and both the first weak point 2113 and the second weak point 2114 are exposed in the through hole 31. When the pressure relief valve 111 is opened, the second weak point 2114 can be disconnected under the impact force of the rushing gas, thereby disconnecting the thermally runaway battery cell 10 from the multiple parallel battery cells 10, further reducing the impact of the thermally runaway battery cell 10 on other battery cells 10. In this way, even if no short circuit occurs in the integrated busbar 20, the thermally runaway battery cell 10 can be disconnected from the parallel circuit in a timely manner.

[0066] The second sub-part 2112 and at least part of the first weak part 2113 are exposed in the through hole 31. Therefore, when the battery cell 10 thermally runs away, the terminal post 112, the second sub-part 2112, and the pressure relief valve 111 fall off together and fly out of the through hole 31 with the opening airflow. This can ensure that the pressure relief valve 111 of the battery cell 10 can open normally and the gas in the battery cell 10 can be discharged normally, avoiding the battery cell 10 from exploding and deflagration.

[0067] In one embodiment, as shown in Figures 2, 5A, 5B and 7, the integrated busbar 20 includes a bracket 22, which is disposed between the busbar 21 and the battery cell 10. The bracket 22 is used to support the busbar 21. The guide busbar 211 includes a connecting arm 2115, and the two ends of the connecting arm 2115 are respectively connected to a second weak part 2114. The bracket 22 is provided with a groove 221, and a connecting arm 2115 is disposed in a groove 221.

[0068] As shown in Figures 5A and 5B, a support groove is provided on the surface of the bracket 22 near the busbar 21 to accommodate the busbar 21. The bracket 22 also has multiple openings, exposing the top of each battery cell 10. The busbar 21 passes through these openings and is electrically connected to the battery cell 10. Specifically, the first sub-part 2111 is electrically connected to the first electrode 113, and the second sub-part 2112 is electrically connected to the second electrode 114.

[0069] As shown in Figures 5B and 6, the flow guide 211 includes multiple connecting arms 2115, which connect two adjacent battery cells 10 along the second direction D2. Each end of the connecting arm 2115 has a second weak point 2114. When the second weak point 2114 at both ends of the connecting arm 2115 is broken by the airflow from the valve opening, the connecting arm 2115 will fall between the two adjacent battery cells 10, potentially causing the casings 12 of the two adjacent battery cells 10 to conduct, resulting in a short circuit.

[0070] To address this, a groove 221 corresponding to the connecting arm 2115 can be provided on the bracket 22. When the connecting arm 2115 detaches, it is supported by the bottom of the groove 221, thus preventing it from falling between two adjacent battery cells 10.

[0071] The integrated busbar 20 may also include a flexible circuit board 23 for acquiring and transmitting voltage data. The flexible circuit board 23 is disposed on the surface of the support 22 away from the battery cell 10, and is located at the edge of the support 22. The flexible circuit board 23 can be connected to the busbar 21 via multiple connecting tabs 231. One end of the connecting tab 231 is connected to the edge of the flexible circuit board 23, and the other end is connected to the busbar 21. The material of the connecting tab 231 can be nickel, but is not limited to this. One connecting tab 231 is connected to the first busbar 212, another connecting tab 231 is connected to the second busbar 213, and multiple connecting tabs 231 are connected one-to-one with multiple busbars 211. This configuration simplifies the assembly of the integrated busbar 20 and increases production efficiency.

[0072] 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 cylindrical battery 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.

[0073] The diameter of the through hole 31 is smaller than the outer diameter of the cylindrical battery cell 10, so that the fireproof strip 30 can at least cover the gap between two adjacent battery cells 10, preventing conductors in the airflow ejected by the pressure relief valve 111 from falling between the two adjacent battery cells 10 and causing a short circuit.

[0074] Optionally, the battery cell 10 is a cylindrical cell or a square electrode, but is not limited thereto.

[0075] Secondly, as shown in FIG8, an embodiment of this application provides a battery pack 2, which includes the battery module 1 described above.

[0076] In this embodiment, the battery pack 2 may include multiple battery modules 1 and a battery box, with the multiple battery modules placed inside the battery box.

Claims

1. A battery module (1), comprising: Multiple battery cells (10), each of which is provided with a pressure relief valve (111) on its top. An integrated busbar (20) is disposed on one side of the top of the plurality of battery cells (10); Fireproof strip (30) is provided on the side of the integrated busbar (20) away from the battery cell (10), and the fireproof strip (30) is provided with through holes (31) corresponding to the pressure relief valve (111).

2. The battery module (1) according to claim 1, wherein, An insulating part (32) is provided inside the through hole (31), and the edge of the insulating part (32) is connected to the side wall of the through hole (31) through a weak structure (34).

3. The battery module (1) according to claim 2, wherein, The weak structure (34) includes multiple connecting ribs, which are spaced apart along the edge of the insulating portion (32).

4. The battery module (1) according to claim 1, wherein, An insulating film (33) is provided on one side surface of the fireproof strip (30), the insulating film (33) covers each of the through holes (31), and the thickness of the insulating film (33) is less than the thickness of the fireproof strip (30).

5. The battery module (1) according to claim 1, wherein, 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 cylindrical battery cell (10).

6. The battery module (1) according to any one of claims 1 to 5, wherein, The battery cell (10) includes a first electrode (113) and a second electrode (114) disposed on the same end face of the battery cell (10) as the pressure relief valve (111). The first electrode (113) is disposed around the pressure relief valve (111), and the pressure relief valve (111) is disposed around the second electrode (114).

7. The battery module (1) according to claim 6, characterized in that, The pressure relief valve (111) is connected to the second electrode (114).

8. The battery module (1) according to claim 6, wherein, The integrated busbar (20) includes a busbar (21), which includes a plurality of guides (211) arranged along a first direction. The guides (211) are connected in series with a plurality of battery cells (10). The guides (211) include a first sub-part (2111) connected to the first electrode (113), a second sub-part (2112) connected to the second electrode (114), and a first weak part (2113) connecting the first sub-part (2111) and the second sub-part (2112). The through hole (31) exposes the second sub-part (2112) and at least part of the first weak part (2113). The cross-sectional area of ​​the first sub-part (2111) and the second sub-part (2112) is larger than the cross-sectional area of ​​the first weak part (2113). The second sub-part (2112) is connected to the second electrode (114).

9. The battery module (1) according to claim 8, wherein, The flow guide (211) includes a second weak part (2114), which connects two adjacent second sub-parts (2112). The through hole (31) exposes the second weak part (2114), and the cross-sectional area of ​​the second sub-part (2112) is greater than that of the second weak part (2114).

10. The battery module (1) according to claim 9, wherein, The integrated busbar (20) includes a bracket (22), which is disposed between the busbar (21) and the battery cell (10). The bracket (22) is used to support the busbar (21). The guide bus (211) includes a connecting arm (2115), and the two ends of the connecting arm (2115) are respectively connected to a second weak part (2114). The bracket (22) is provided with a groove (221), and the connecting arm (2115) is disposed in the groove (221).

11. A battery pack (2) comprising the above-described battery module (1), the battery module (1) comprising: Multiple battery cells (10), each of which is provided with a pressure relief valve (111) on its top. An integrated busbar (20) is disposed on one side of the top of the plurality of battery cells (10); Fireproof strip (30) is provided on the side of the integrated busbar (20) away from the battery cell (10), and the fireproof strip (30) is provided with through holes (31) corresponding to the pressure relief valve (111).

12. The battery pack (2) according to claim 11, wherein, An insulating part (32) is provided inside the through hole (31), and the edge of the insulating part (32) is connected to the side wall of the through hole (31) through a weak structure (34).

13. The battery pack (2) according to claim 12, wherein, The weak structure (34) includes multiple connecting ribs, which are spaced apart along the edge of the insulating portion (32).

14. The battery pack (2) according to claim 11, wherein, An insulating film (33) is provided on one side surface of the fireproof strip (30), the insulating film (33) covers each of the through holes (31), and the thickness of the insulating film (33) is less than the thickness of the fireproof strip (30).

15. The battery pack (2) according to claim 11, wherein, 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 cylindrical battery cell (10).

16. The battery pack (2) according to any one of claims 11 to 15, wherein, The battery cell (10) includes a first electrode (113) and a second electrode (114) disposed on the same end face of the battery cell (10) as the pressure relief valve (111). The first electrode (113) is disposed around the pressure relief valve (111), and the pressure relief valve (111) is disposed around the second electrode (114).

17. The battery pack (2) according to claim 16, wherein, The pressure relief valve (111) is connected to the pole (112).

18. The battery pack (2) according to claim 16, wherein, The integrated busbar (20) includes a busbar (21), which includes a plurality of guides (211) arranged along a first direction. The guides (211) are connected in series with a plurality of battery cells (10). The guides (211) include a first sub-part (2111) connected to the first electrode (113), a second sub-part (2112) connected to the second electrode (114), and a first weak part (2113) connecting the first sub-part (2111) and the second sub-part (2112). The through hole (31) exposes the second sub-part (2112) and at least part of the first weak part (2113). The cross-sectional area of ​​the first sub-part (2111) and the second sub-part (2112) is larger than the cross-sectional area of ​​the first weak part (2113). The second sub-part (2112) is connected to the second electrode (114).

19. The battery pack (2) according to claim 18, wherein, The flow guide (211) includes a second weak part (2114), which connects two adjacent second sub-parts (2112). The through hole (31) exposes the second weak part (2114), and the cross-sectional area of ​​the second sub-part (2112) is greater than that of the second weak part (2114).

20. The battery pack (2) according to claim 19, wherein, The integrated busbar (20) includes a bracket (22), which is disposed between the busbar (21) and the battery cell (10). The bracket (22) is used to support the busbar (21). The guide bus (211) includes a connecting arm (2115), and the two ends of the connecting arm (2115) are respectively connected to a second weak part (2114). The bracket (22) is provided with a groove (221), and the connecting arm (2115) is disposed in the groove (221).

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