Battery module and battery pack

Abstract

The application discloses a battery module and a battery pack, and belongs to the technical field of batteries. The battery module comprises a plurality of battery monomers and a separation pad. The plurality of battery monomers are arranged along a first direction. The battery monomers comprise explosion-proof valves. The separation pad is connected with the plurality of battery monomers and covers the explosion-proof valves of the plurality of battery monomers. The separation pad is provided with a plurality of weak parts which are arranged at intervals along the first direction. Each weak part is arranged in correspondence with one explosion-proof valve. According to the application, the separation pad is connected with the battery monomers and covers the explosion-proof valves of the battery monomers. Meanwhile, the weak parts are arranged on the separation pad in correspondence with the explosion-proof valves. In this way, when the explosion-proof valves of the adjacent battery monomers are shielded by the separation pad during thermal runaway of one battery monomer, the high-temperature molten material can be effectively prevented from affecting the adjacent battery monomers, thereby reducing the possibility of thermal runaway chain reaction of the battery module, and the safety of the battery module is improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery module and battery pack. Background Technology

[0002] Battery safety has always been a key concern in the energy storage and new energy vehicle sectors. To prevent explosions, batteries are typically equipped with explosion-proof valves to release high-temperature gases and molten materials generated during thermal runaway. However, when thermal runaway occurs, the high-temperature gases and molten materials ejected from the explosion-proof valves can easily affect nearby batteries, triggering a chain reaction of thermal runaway throughout the entire battery module. Utility Model Content

[0003] The purpose of this utility model is to provide a battery module that addresses the problem of thermal runaway of a battery in a battery pack affecting adjacent batteries and causing a chain reaction of thermal runaway in the battery module. Another purpose of this application is to provide a battery pack.

[0004] Technical solution: A battery module according to an embodiment of this application includes:

[0005] Multiple battery cells are arranged along a first direction, and each battery cell includes an explosion-proof valve.

[0006] An isolation pad is connected to and covers the explosion-proof valves of multiple battery cells; the isolation pad is provided with multiple weak points spaced apart along a first direction, and each weak point is corresponding to an explosion-proof valve.

[0007] In some embodiments, the weak point completely covers the explosion-proof valve.

[0008] In some embodiments, the weak portion includes a groove, which is disposed on the side of the insulating pad away from the explosion-proof valve. The groove is projected onto the battery cell along a second direction and surrounds the outer periphery of the explosion-proof valve. The second direction intersects the first direction.

[0009] In some embodiments, the notch is circular.

[0010] In some embodiments, the groove includes opposing first and second ends, which are spaced apart.

[0011] In some embodiments, the weak portion includes multiple grooves, the multiple grooves being spaced apart on the outer periphery of the explosion-proof valve by their orthogonal projections along a second direction on the battery cell.

[0012] In some embodiments, the explosion-proof valves of at least two adjacent battery cells are staggered along the first direction, and at least two adjacent weak points are staggered along the first direction, with each weak point corresponding to one explosion-proof valve.

[0013] In some embodiments, the isolation pad includes:

[0014] The first body is attached to the side of multiple battery cells equipped with explosion-proof valves and covers the explosion-proof valves; the weak point is set on the first body;

[0015] The second body is connected to the first body and is attached to the side of multiple battery cells that are not equipped with explosion-proof valves.

[0016] In some embodiments, the battery module further includes a smoke exhaust assembly having a smoke exhaust groove. The smoke exhaust assembly is connected to the side of the isolation pad away from the battery cell. The isolation pad covers the opening of the smoke exhaust groove. The orthographic projection of the weak part along a second direction on the smoke exhaust assembly is located inside the smoke exhaust groove. The second direction intersects with the first direction.

[0017] In some embodiments, the smoke extraction assembly includes:

[0018] The first plate is sealed and connected to the isolation gasket;

[0019] The second plate is connected to the side of the first plate away from the isolation pad, and is spaced apart from the isolation pad along the second direction;

[0020] The third plate is connected to the side of the second plate away from the first plate and is sealed to the isolation gasket.

[0021] The first plate, the second plate, and the third plate form a smoke exhaust trough.

[0022] In some embodiments, along the second direction, the size of the third plate is larger than that of the first plate, and a portion of the third plate is disposed on the side of the battery cell where the explosion-proof valve is not provided, and is connected to the battery cell.

[0023] In some embodiments, the smoke exhaust assembly further includes a fourth plate, which is disposed on the side of the third plate near the battery cell and is connected to both the battery cell and the third plate.

[0024] In some embodiments, the second plate has at least one smoke exhaust hole, which is located at one end of the second plate near the first plate and communicates with the smoke exhaust channel.

[0025] In some embodiments, the battery module further includes a side plate disposed on the side of the first plate away from the third plate and connected to a plurality of battery cells respectively.

[0026] In some embodiments,

[0027] The battery cell includes at least two explosion-proof valves disposed on both sides thereon along the second direction;

[0028] The battery module includes at least two isolation pads disposed opposite each other along a second direction, and at least two smoke exhaust components disposed opposite each other along a second direction; the at least two isolation pads are disposed opposite each other on both sides of the battery cell along the second direction and are respectively connected to the battery cell; each smoke exhaust component is disposed along the second direction on the side of an isolation pad away from the battery cell and is connected to the isolation pad.

[0029] The second direction intersects with the first direction.

[0030] In some embodiments, the outer surface of the smoke exhaust assembly is provided with a protective layer, which is a heat-insulating coating.

[0031] Accordingly, a battery pack according to an embodiment of this application includes a battery module as described in any of the foregoing embodiments.

[0032] Beneficial Effects: Compared with the prior art, a battery module according to an embodiment of this application includes multiple battery cells and a separator. The multiple battery cells are arranged along a first direction, and each battery cell includes an explosion-proof valve. The separator is connected to the multiple battery cells and covers the explosion-proof valves of the multiple battery cells. The separator has multiple weak points spaced apart along the first direction, and each weak point corresponds to an explosion-proof valve. By setting the separator to connect to the battery cells and cover the explosion-proof valves of the battery cells, and setting weak points on the separator corresponding to the explosion-proof valves, this application ensures that when a battery cell experiences thermal runaway and opens its valve to release pressure, the weak points ensure that the explosion-proof valve can release pressure smoothly. Furthermore, the separator can shield the explosion-proof valves of adjacent battery cells, effectively preventing high-temperature molten material from affecting the explosion-proof valves of adjacent battery cells, thereby reducing the possibility of a thermal runaway chain reaction in the battery module and improving the safety of the battery module.

[0033] Compared with the prior art, a battery pack according to an embodiment of this application includes a battery module as described in any of the foregoing embodiments. It is understood that the battery pack of this application includes all the technical features and effects of the aforementioned battery modules, which will not be repeated here. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of a battery module according to an embodiment of this application;

[0036] Figure 2 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application;

[0037] Figure 3 This is a schematic diagram of a structure in which multiple battery cells are connected to an isolation plate according to an embodiment of this application;

[0038] Figure 4 This is a schematic diagram of the structure of an isolation plate according to an embodiment of this application;

[0039] Figure 5 This is a schematic diagram of a structure in which the two ends of the notch are not connected, according to an embodiment of this application;

[0040] Figure 6 This is a schematic diagram of a structure in which the two ends of the notch are connected according to an embodiment of this application;

[0041] Figure 7 This is a schematic diagram of a structure with multiple serrations spaced according to an embodiment of this application;

[0042] Figure 8 This is a cross-sectional view of a battery module according to an embodiment of this application;

[0043] Figure 9 yes Figure 8 Enlarged view of section A;

[0044] Figure 10 This is a schematic diagram of the structure of an exhaust assembly according to an embodiment of this application;

[0045] Figure 11 This is a side view of a battery module according to an embodiment of this application;

[0046] Figure 12 This is a partial cross-sectional view of an exhaust assembly according to an embodiment of this application;

[0047] Figure 13 This is a partial structural diagram of a battery pack composed of two battery modules according to an embodiment of this application.

[0048] Explanation of reference numerals in the attached figures:

[0049] 100. Battery cell; 110. Explosion-proof valve;

[0050] 200, isolation pad; 210, weak point; 211, notch; 212, first end; 213, second end; 220, first body; 230, second body;

[0051] 300. Smoke exhaust assembly; 310. Smoke exhaust trough; 320. First plate; 330. Second plate; 331. Smoke exhaust hole; 340. Third plate; 350. Fourth plate; 360. Protective layer;

[0052] 400, side panels;

[0053] X, the first direction; Y, the second direction. Detailed Implementation

[0054] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0055] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified. In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular, for example, the range of included angles from 80° to 100° is considered perpendicular. Similarly, "parallel" means completely parallel or almost completely parallel, for example, the range of completely parallel angles from 10° is considered parallel.

[0056] It should also be noted that in the accompanying drawings of this application, arrows labeled X indicate the first direction X, and arrows labeled Y indicate the second direction Y. In the embodiments of this application, the first direction X is the direction in which the plurality of battery cells 10011 are arranged; the second direction Y is the length direction of the battery cell 100; the first direction X and the second direction Y are introduced to facilitate the description of the structural positional relationship of the components of the battery module, thereby facilitating the understanding of its structure. In the embodiments of this application, the first direction X and the second direction Y are preferably perpendicular to each other.

[0057] Battery safety has always been a key concern in the energy storage and new energy vehicle sectors. To prevent explosions, batteries are typically equipped with explosion-proof valves 110 to release flammable gases and high-temperature electrolytes accumulated inside the battery. When a battery experiences thermal runaway, the high-temperature gases and electrolytes ejected from the explosion-proof valve 110 can easily affect nearby batteries, triggering a chain reaction of thermal runaway throughout the entire battery module and increasing the risk.

[0058] In view of this, embodiments of this application provide a battery module aimed at solving the above-mentioned problems.

[0059] Please refer to the following: Figure 1 , Figure 2 , Figure 3 and Figure 4 This application provides a battery module including multiple battery cells 100 and a separator 200. The multiple battery cells 100 are arranged along a first direction X. Each battery cell 100 includes an explosion-proof valve 110. The separator 200 is connected to the multiple battery cells 100 and covers the explosion-proof valves 110 of the multiple battery cells 100. The separator 200 is provided with multiple weak points 210 spaced apart along the first direction X. Each weak point 210 is correspondingly provided with one explosion-proof valve 110.

[0060] In this embodiment, by setting an isolation pad 200 connected to and covering the explosion-proof valve 110 of the battery cell 100, when one battery cell 100 thermally runs away and opens its valve to release pressure, the isolation pad 200 shields the explosion-proof valves 110 of adjacent battery cells 100. This effectively prevents high-temperature molten material from affecting the explosion-proof valves 110 of adjacent battery cells 100, thereby reducing the possibility of a thermal runaway chain reaction in the battery module and improving the safety of the battery module. Simultaneously, a weak point 210 is provided in the isolation pad 200 corresponding to the explosion-proof valve 110. When an individual battery cell 100 thermally runs away and opens its valve, the weak point 210 can crack upon impact, allowing the explosion-proof valve 110 to open smoothly and release pressure, ensuring that the thermally runaway battery cell 100 can release pressure smoothly.

[0061] In this embodiment, the insulating pad 200 can be a high-temperature resistant, insulating, and heat-insulating insulating pad, such as mica paper. The insulating pad 200 can be adhesively attached to the surface of the battery cell 100 and cover the explosion-proof valve 110, thus protecting the explosion-proof valve 110. The insulating pad 200 is connected to multiple battery cells 100 and covers each explosion-proof valve 110. In this case, when one or more battery cells 100 experience thermal runaway and open their valves to release pressure, the discharged electrolyte or other high-temperature molten material can come into contact with the insulating pad 200, avoiding direct contact with the explosion-proof valve 110, thereby preventing damage to the explosion-proof valve 110. This ensures the safety of adjacent battery cells 100 and improves the safety of the battery module in the event of thermal runaway of a battery cell 100.

[0062] It should be noted that this application provides a weak part 210 at the position opposite to the explosion-proof valve 110 on the isolation pad 200. This is so that when the explosion-proof valve 110 is opened, the weak part 210, due to its relatively low structural strength, can cover the weak part 210, causing it to crack. This ensures that the explosion-proof valve 110 can open smoothly to release pressure, and avoids affecting other parts of the isolation pad 200.

[0063] It should be noted that multiple battery cells 100 are arranged in a group along the first direction X, and the multiple battery cells 100 are connected in series and parallel to maintain a certain pressure input and output. At the same time, the battery cells 100 are connected by the isolation pad 200, which helps to maintain the structural stability of the battery cells 100 after being grouped together.

[0064] It should also be noted that the location of the weak point 210 in this application can be flexibly set according to the specific location of the explosion-proof valve 110.

[0065] In some embodiments, the weak portion 210 completely covers the explosion-proof valve 110.

[0066] Specifically, the weak part 210 can be projected onto the battery cell 100 along the second direction Y to completely cover the explosion-proof valve 110, and the second direction Y intersects with the first direction X.

[0067] In this embodiment, the weak part 210 is configured to completely cover the explosion-proof valve 110, that is, the orthographic projection of the weak part 210 covers the explosion-proof valve 110. When the explosion-proof valve 110 is opened, the weak part 210 is lifted up. At this time, the opening area of ​​the weak part 210 is greater than or equal to the opening area of ​​the explosion-proof valve 110, thereby avoiding the isolation pad 200 from blocking the opening and depressurization of the explosion-proof valve 110 and ensuring rapid depressurization.

[0068] Of course, the area of ​​the weak part 210 should not be too large. For example, the weak part 210 can extend about 2 mm beyond the outer edge of the explosion-proof valve 110. This will make it easier for the weak part 210 to be quickly pushed open and reduce the pulling on the surrounding isolation pad 200, while ensuring that the explosion-proof valve 110 can release pressure without obstruction.

[0069] like Figure 5 As shown, in some embodiments, the weak portion 210 includes a notch 211, which is disposed on the side of the isolation pad 200 away from the explosion-proof valve 110. The notch 211 is disposed around the outer periphery of the explosion-proof valve 110 by its orthogonal projection along the second direction Y on the battery cell 100.

[0070] In this embodiment, by providing a notch 211 at the edge of the weak portion 210, the notch 211 is more likely to break under impact, making it easier for the weak portion 210 to be opened. The notch 211 is arranged around the outer periphery of the explosion-proof valve 110, which can ensure the opening area after the weak portion 210 is opened. The notch 211 is located on the side of the isolation pad 200 away from the explosion-proof valve 110, which can bend to both sides when the explosion-proof valve 110 is opened, making it easier for the notch 211 to break.

[0071] like Figure 6 As shown, in some embodiments, the notch 211 is annular.

[0072] In this embodiment, the notch 211 is a closed ring, which can keep the outer periphery of the weak part 210 relatively thin, ensuring that the weak part 210 can respond quickly and crack when subjected to force transmitted from any direction on the side where the explosion-proof valve 110 is located, so that the weak part 210 can be lifted open.

[0073] like Figure 5 As shown, in some embodiments, the notch 211 includes a first end 212 and a second end 213 opposite to each other, the first end 212 and the second end 213 being spaced apart.

[0074] In this embodiment of the application, the notch 211 is an open ring and the beginning and end of the notch 211 are not connected. At this time, the weak part 210 has a section with the same thickness as the isolation pad 200, which can maintain the connection between the weak part 210 and the body of the isolation pad 200. When the explosion-proof valve 110 is opened, it can break at the location of the notch 211 and the weak part 210 is lifted up.

[0075] like Figure 7 As shown, in some embodiments, the weak portion 210 includes multiple grooves 211, and the multiple grooves 211 are spaced apart on the outer periphery of the explosion-proof valve 110 along the second direction Y with their orthogonal projections on the battery cell 100.

[0076] In this embodiment, multiple grooves 211 are spaced apart, which can ensure the connection strength between the weak part 210 and the body of the isolation pad 200, prevent the grooves 211 from breaking due to non-thermal runaway factors such as vibration, and improve the safety of the isolation pad 200.

[0077] Please refer to the following: Figure 3 and Figure 4 In some embodiments, the explosion-proof valves 110 of at least two adjacent battery cells 100 are offset along the first direction X, and at least two adjacent weak points 210 are offset along the first direction X, with each weak point 210 corresponding to one explosion-proof valve 110.

[0078] In this embodiment, by setting at least two adjacent explosion-proof valves 110 in a staggered manner, the corresponding weak parts 210 of the two adjacent explosion-proof valves 110 are also staggered. When one of the two staggered explosion-proof valves 110 explodes due to battery thermal runaway, the possibility of direct impact on the central area of ​​the adjacent weak parts 210 can be reduced when the thermal runaway gas and high-temperature molten material flow along the first direction X, thereby reducing the impact on the adjacent weak parts 210 and further improving safety.

[0079] like Figure 4 As shown, in some embodiments, the isolation pad 200 includes a first body 220 and a second body 230. The first body 220 is attached to the side of the plurality of battery cells 100 where the explosion-proof valve 110 is provided, and covers the explosion-proof valve 110. A plurality of weak parts 210 are provided on the first body 220. The second body 230 is connected to the first body 220 and is attached to the side of the plurality of battery cells 100 where the explosion-proof valve 110 is not provided.

[0080] In this embodiment, the first body 220 is used to fit with the explosion-proof valve 110, and the second body 230 is used to be attached to the side of the battery cell 100 where the explosion-proof valve 110 is not installed. At this time, by using other structures of the battery module, the second body 230 of the isolation pad 200 can be squeezed between the battery cell 100 and the fixed structure, which can prevent the isolation pad 200 from detaching as a whole when the explosion-proof valve 110 is opened and sprayed.

[0081] Furthermore, structures such as support structures or positioning and fixing plates are required for the battery cells 100 to be assembled, which can be used to connect the battery cells 100 and the second body 230 to ensure the stability of the second body 230.

[0082] Please refer to the following: Figure 8 and Figure 9 In some embodiments, the battery module further includes a smoke exhaust assembly 300, which has a smoke exhaust groove 310. The smoke exhaust assembly 300 is connected to the side of the isolation pad 200 away from the battery cell 100. The isolation pad 200 covers the opening of the smoke exhaust groove 310. The orthographic projection of the weak portion 210 along the second direction Y on the smoke exhaust assembly 300 is located in the smoke exhaust groove 310. The second direction Y intersects with the first direction X.

[0083] In this embodiment, by setting up the exhaust assembly 300, the high-temperature flue gas discharged from the thermal runaway of the battery cell 100 can be gathered into the exhaust trough 310 and guided to the outside of the battery module through the exhaust trough 310, which is conducive to the high-temperature flue gas being discharged to the outside along a specified path.

[0084] In this embodiment, the orthographic projection of the weak part 210 along the second direction Y on the smoke exhaust assembly 300 is located inside the smoke exhaust trough 310. Since the weak part 210 covers the explosion-proof valve 110, it can be understood that the explosion-proof valve 110 and the slot of the smoke exhaust trough 310 are arranged opposite each other. When the explosion-proof valve 110 is opened to release pressure, the discharged high-temperature flue gas can smoothly enter the smoke exhaust trough 310.

[0085] It should be noted that in this application, the isolation pad 200 covers the opening of the exhaust trough 310. At this time, the isolation pad 200 and one side of the exhaust assembly 300 form an exhaust channel, guiding the high-temperature flue gas from thermal runaway in a predetermined direction. The isolation pad 200 covers the explosion-proof valve 110. At this time, the high-temperature flue gas and the high-temperature molten material in the exhaust trough 310 directly contact the isolation pad 200, which can prevent the explosion-proof valve 110 from contacting the high-temperature molten material, thereby reducing the possibility of the explosion-proof valve 110 being damaged and improving the safety of adjacent battery cells 100 of the thermal runaway battery cell 100.

[0086] Please refer to the following: Figure 9 and Figure 10 In some embodiments, the smoke exhaust assembly 300 includes a first plate 320, a second plate 330, and a third plate 340. The first plate 320 is sealed to the isolation pad 200. The second plate 330 is connected to the side of the first plate 320 away from the isolation pad 200 and is spaced apart from the isolation pad 200 along the second direction Y. The third plate 340 is connected to the side of the second plate 330 away from the first plate 320 and is sealed to the isolation pad 200. The first plate 320, the second plate 330, and the third plate 340 form a smoke exhaust trough 310.

[0087] In this embodiment of the application, a smoke exhaust trough 310 is formed by setting a first plate 320, a second plate 330 and a third plate 340. At this time, the smoke exhaust assembly 300 has a C-shaped structure and is sealed with the isolation pad 200 to form a side-sealed smoke exhaust channel. At this time, smoke exhaust pipes can be sealed and connected at both ends along the first direction X, which can exhaust high-temperature flue gas to the outside.

[0088] It should be noted that both the first and third plates can be bonded to the isolation pad 200 with sealant. The distance between the second plate and the isolation pad 200 can be flexibly set according to the opening requirements of the explosion-proof valve 110. The smoke exhaust assembly 300 can be formed by stamping aluminum profiles.

[0089] Please refer to the following: Figure 9 and Figure 10 In some embodiments, along the second direction Y, the size of the third plate 340 is larger than the size of the first plate 320, and a portion of the third plate 340 is disposed on the side of the battery cell 100 where the explosion-proof valve 110 is not provided, and is connected to the battery cell 100.

[0090] In this embodiment, the size of the third plate 340 is larger than that of the first plate 320. This allows a portion of the third plate 340 to extend to the side of the battery cell 100 where the explosion-proof valve 110 is located, so as to fix multiple battery cells 100 in groups and improve the stability of the battery cells 100 after being grouped together.

[0091] Please refer to the following: Figure 9 and Figure 10 In some embodiments, the smoke exhaust assembly 300 further includes a fourth plate 350, which is disposed on the side of the third plate 340 near the battery cell 100 and is connected to the battery cell 100 and the third plate 340 respectively.

[0092] In this embodiment, the fourth plate 350 is connected to and stacked with the third plate 340, which can improve the overall structural strength of the smoke exhaust assembly 300 and thus improve its support and fixing performance.

[0093] like Figure 9 As shown, in some embodiments, the first plate 320 and the second plate 330 are disposed on the side of the first body 220 away from the battery cell 100, and part of the third plate 340 is disposed on the side of the second body 230 away from the battery cell 100. In this case, the smoke exhaust assembly 300 can be used to press the isolation pad 200 as a whole to ensure the stability of the isolation pad 200.

[0094] In some embodiments, the battery module can be placed inside the housing. In this case, the third plate 340 can be connected to the bottom plate or internal fixing mechanism of the housing to support and fix the multiple battery cells 100 after they are grouped together, which is equivalent to the base of the battery module.

[0095] In some embodiments, the fourth plate 350 and the third plate 340 can be an integral structure. By folding and flattening the fourth plate 350 toward the side of the third plate 340 closer to the first plate 320, a structure is formed in which the third plate 340 and the fourth plate 350 are stacked. This can effectively improve the overall structural strength of the third plate 340 and the fourth plate 350, thereby improving the support performance. When used as a base, it can better weigh the entire battery module and reduce deformation.

[0096] Furthermore, in some embodiments, the smoke exhaust assembly 300 is an integral structure, which facilitates integral molding and ensures overall structural stability.

[0097] like Figure 9 As shown, in some embodiments, the second plate 330 has at least one smoke exhaust hole 331, which is disposed at one end of the second plate 330 near the first plate 320 and communicates with the smoke exhaust groove 310.

[0098] In this embodiment, by providing the exhaust port 331, the exhaust gas can be discharged more quickly when the thermal runaway of the battery cell 100 is severe, and the exhaust gas is discharged into the housing where the battery module is located, thereby reducing the pressure in the battery cell 100 and the exhaust trough 310 as quickly as possible. At the same time, by placing the exhaust port 331 at one end close to the first plate 320, the exhaust gas and the high-temperature molten material can be separated under the action of gravity, reducing the possibility of the high-temperature molten material overflowing from the exhaust trough 310 to the outside.

[0099] like Figure 11 As shown, in some embodiments, the battery module further includes a side plate 400, which is disposed on the side of the first plate 320 away from the third plate 340 and is connected to a plurality of battery cells 100 respectively.

[0100] In this embodiment, a side plate 400 is provided to further fix multiple battery cells 100, improving the overall structural stability of the battery module. Simultaneously, it covers the terminals of the battery cells 100, enhancing safety.

[0101] like Figure 8 As shown, in some embodiments, the battery cell 100 includes at least two explosion-proof valves 110 disposed on both sides thereon along the second direction Y; the battery module includes at least two isolation pads 200 disposed opposite each other along the second direction Y, and at least two smoke exhaust components 300 disposed opposite each other along the second direction Y; the at least two isolation pads 200 are disposed opposite each other on both sides of the battery cell 100 along the second direction Y and are respectively connected to the battery cell 100; each smoke exhaust component 300 is disposed on the side of an isolation pad 200 away from the battery cell 100 along the second direction Y and is connected to the isolation pad 200; the second direction Y intersects the first direction X.

[0102] In this embodiment, the battery cell 100 can have its terminals positioned at both ends along the second direction Y, with explosion-proof valves 110 respectively installed at both ends. In this configuration, the battery cell 100 lies horizontally, with the terminals and explosion-proof valves 110 located on both sides, facilitating connection between the terminals and the busbar, and also facilitating connection of the explosion-proof valves 110 to the exhaust system. In this embodiment, at least two heat insulation pads (or an even number greater than two) can be used. The exhaust system 300 is preferably two in number, symmetrically arranged on both sides of the battery cell 100 along the second direction Y. This not only utilizes the exhaust system 300 and the heat insulation pads to form an exhaust channel for facilitating the discharge of thermally runaway gases, but also uses the heat insulation pads to isolate the explosion-proof valves 110 at both ends of the battery cell 100 from high-temperature smoke and molten material, protecting the safety of other battery cells 100. Simultaneously, the third plates 340 of the two exhaust systems 300 on both sides can be used to support multiple battery cells 100, serving as a support base for the battery module.

[0103] It should be noted that the battery cell 100 of this application may have a positive terminal and a negative terminal on both sides, and an explosion-proof valve 110 may be provided on both sides of the battery cell 100. The explosion-proof valve 110 on the same side as the positive terminal is closer to the edge of the battery cell 100, and the explosion-proof valve 110 on the same side as the negative terminal is closer to the negative terminal. Therefore, when two adjacent battery cells 100 are connected in series, the positive terminal and the negative terminal of the corresponding two battery cells 100 are located on the same side. At this time, there is a height difference between the two explosion-proof valves 110 on the same side, and a misalignment occurs in the first direction X. It is understood that the multiple battery cells 100 in this application can be connected in series or parallel according to the voltage and current requirements of the battery module. In this case, the positions of the explosion-proof valves 110 of the corresponding battery cells 100 will also differ, resulting in different arrangements of the explosion-proof valves 110, including staggered arrangements. Consequently, the orthographic projections of the multiple explosion-proof valves 110 in the first direction X will partially not overlap, and the orthographic projections of the multiple weak points 210 in the first direction X will also partially not overlap. However, if all the battery cells 100 are connected in series or parallel, the positions of adjacent explosion-proof valves 110 will not overlap, and their orthographic projections in the first direction X can completely coincide. Similarly, the orthographic projections of the weak points 210 corresponding to the explosion-proof valves 110 along the first direction X can also completely coincide. Therefore, the arrangement of the weak points 210 on the insulating pad 200 can be flexibly adjusted according to the arrangement of the battery cells 100.

[0104] like Figure 12 As shown, in some embodiments, the outer surface of the smoke exhaust assembly 300 is provided with a protective layer 360, which is a heat-insulating coating.

[0105] In this embodiment of the application, by setting the protective layer 360, the overall high temperature resistance, heat insulation and insulation performance of the smoke exhaust assembly 300 can be improved, which can prevent thermal runaway from occurring, prevent high temperature diffusion, and provide electrical insulation between battery cells 100 and between battery modules.

[0106] The protective layer 360 can be a high-temperature resistant, heat-insulating, and insulating plastic powder that is directly sprayed onto the surface of the smoke exhaust component 300.

[0107] like Figure 13 As shown, a battery pack according to an embodiment of this application includes a battery module as described in any of the foregoing embodiments.

[0108] It is understood that the battery pack of this application includes all the technical features and effects of the aforementioned battery module, which will not be repeated here.

[0109] Of course, the battery pack of this application can be used in energy storage systems, new energy vehicles, and other electrical equipment that requires power.

[0110] It is understood that the energy storage system of this application includes all the technical features and effects of the aforementioned battery module or battery pack, which will not be repeated here.

[0111] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0112] The battery module, battery pack, and energy storage system provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery module, characterized by, include: Multiple battery cells are arranged along a first direction, and each battery cell includes an explosion-proof valve. An isolation pad is connected to multiple battery cells and covers the explosion-proof valves of multiple battery cells; the isolation pad is provided with multiple weak points spaced apart along the first direction, and each weak point is corresponding to one of the explosion-proof valves.

2. The battery module of claim 1, wherein, The weak point completely covers the explosion-proof valve.

3. The battery module of claim 2, wherein, The weak part includes a groove, which is provided on the side of the insulating pad away from the explosion-proof valve. The groove is projected onto the battery cell along a second direction and surrounds the outer periphery of the explosion-proof valve. The second direction intersects the first direction.

4. The battery module of claim 3, wherein, The engraving is circular.

5. The battery module according to claim 3, characterized in that, The groove includes a first end and a second end opposite to each other, with the first end and the second end spaced apart.

6. The battery module according to claim 3, characterized in that, The weak part includes multiple grooves, and the projections of the multiple grooves on the battery cell along the second direction are spaced apart on the outer periphery of the explosion-proof valve.

7. The battery module according to claim 1, characterized in that, The explosion-proof valves of at least two adjacent battery cells are staggered along the first direction, and the weak points of at least two adjacent weak points are staggered along the first direction, with each weak point corresponding to one explosion-proof valve.

8. The battery module according to claim 1, characterized in that, The isolation pad includes: The first body is attached to the side of the plurality of battery cells where the explosion-proof valve is located, and covers the explosion-proof valve; the weak part is located on the first body; The second body is connected to the first body and is attached to the side of the plurality of battery cells where the explosion-proof valve is not installed.

9. The battery module according to claim 1, characterized in that, The battery module further includes a smoke exhaust assembly, which has a smoke exhaust groove. The smoke exhaust assembly is connected to the side of the isolation pad away from the battery cell. The isolation pad covers the opening of the smoke exhaust groove. The orthographic projection of the weak part on the smoke exhaust assembly along a second direction is located inside the smoke exhaust groove. The second direction intersects with the first direction.

10. The battery module according to claim 9, characterized in that, The smoke extraction assembly includes: The first plate is sealed and connected to the isolation pad; The second plate is connected to the side of the first plate away from the isolation pad, and is spaced apart from the isolation pad along the second direction; The third plate is connected to the side of the second plate away from the first plate and is sealed to the isolation gasket. The first plate, the second plate, and the third plate form the smoke exhaust trough.

11. The battery module according to claim 10, characterized in that, Along the second direction, the size of the third plate is larger than that of the first plate, and a portion of the third plate is disposed on the side of the battery cell where the explosion-proof valve is not provided, and is connected to the battery cell.

12. The battery module according to claim 11, characterized in that, The smoke exhaust assembly also includes a fourth plate, which is disposed on the side of the third plate near the battery cell and is connected to both the battery cell and the third plate.

13. The battery module according to claim 11, characterized in that, The second plate has at least one smoke exhaust hole, which is located at one end of the second plate near the first plate and communicates with the smoke exhaust groove.

14. The battery module according to claim 10, characterized in that, The battery module also includes a side plate, which is disposed on the side of the first plate away from the third plate and is connected to a plurality of battery cells respectively.

15. The battery module according to claim 11, characterized in that, The battery cell includes at least two of the explosion-proof valves disposed on both sides thereon along the second direction; The battery module includes at least two isolation pads disposed opposite each other along the second direction, and at least two smoke exhaust components disposed opposite each other along the second direction; the at least two isolation pads are disposed opposite each other on both sides of the battery cell along the second direction and are respectively connected to the battery cell; each smoke exhaust component is disposed along the second direction on the side of one of the isolation pads away from the battery cell and is connected to the isolation pad; The second direction intersects with the first direction.

16. The battery module according to claim 9, characterized in that, The outer surface of the smoke exhaust assembly is provided with a protective layer, which is a heat-insulating coating.

17. A battery pack, characterized in that, Includes the battery module as described in any one of claims 1 to 16.

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