Battery module and battery pack

Abstract

The embodiment of the utility model provides a battery module and a battery pack, and relates to the technical field of batteries. The battery module comprises a battery cell tray, an anti-backflow plate and a plurality of battery cells, the battery cell tray is provided with a bottom wall and an outer wall which are back to back, the bottom wall is provided with a plurality of battery cell mounting positions, each battery cell is arranged in each battery cell mounting position, an anti-explosion valve of each battery cell is located in the corresponding battery cell mounting position, the anti-backflow plate is arranged on the outer wall of the battery cell tray, and the anti-backflow plate is arranged on the outer wall of the battery cell tray. Under the condition that part of the battery cells are in thermal runaway, thermal runaway products of the battery cells break through part of the structures of the anti-backflow plate, and the other structures of the anti-backflow plate prevent the thermal runaway products from flowing back to the anti-explosion valves of the other battery cells, so that the anti-explosion valves of the other battery cells can be prevented from being damaged under the condition that part of the battery cells are in thermal runaway. And the thermal runaway chain reaction caused by temperature rise or short circuit of other battery cells is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery module and a battery pack. Background Art

[0002] In the prior art, most of the technologies for thermal runaway protection are for protecting the entire battery pack from thermal runaway. For example, a whole piece of mica, aerogel or other heat-resistant material is pasted on the upper cover and the bottom of the lower box of the battery box to prevent the upper and lower shells from burning through after the battery cell has thermal runaway.

[0003] However, this method can only relatively delay the time it takes for the thermal runaway of the battery cell to spread to the outside of the entire package. It cannot prevent the thermal runaway or short circuit caused by the flames, hot air flows, molten materials, etc. ejected from some battery cells after thermal runaway from coming into contact with other normal battery cells, which ultimately causes the temperature of other battery cells to rise, thereby causing a chain reaction in other battery cells. Utility Model Content

[0004] The utility model provides a battery module and a battery pack, which can avoid a chain reaction of thermal runaway caused by the temperature rise of other battery cells when thermal runaway occurs to some battery cells.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the utility model provides a battery module, comprising:

[0007] A battery cell tray, the battery cell tray having a bottom wall and an outer wall facing each other, the bottom wall being provided with a plurality of battery cell installation positions;

[0008] A plurality of battery cells, each of the battery cells is arranged at each of the battery cell installation positions, and the explosion-proof valve of the battery cell is located in the battery cell installation position; and

[0009] A backflow prevention plate, the backflow prevention plate being arranged on the outer wall of the battery cell tray;

[0010] Wherein, in the case of thermal runaway of some of the battery cells, the thermal runaway products of the battery cells break through part of the structure of the anti-backflow plate, and the remaining structure of the anti-backflow plate prevents the thermal runaway products from flowing back to the explosion-proof valves of the remaining battery cells.

[0011] In an optional embodiment, the anti-backflow plate has a plurality of anti-backflow areas, the plurality of anti-backflow areas correspond to the plurality of battery cells one by one, and each anti-backflow area is provided with at least one hollow hole.

[0012] In an optional embodiment, the anti-backflow plate has a plurality of anti-backflow areas, the plurality of anti-backflow areas correspond to the plurality of battery cells one by one, and each anti-backflow area is provided with at least one notch groove.

[0013] In an optional embodiment, the battery cell tray is provided with a plurality of through holes, the through holes connecting the bottom wall and the outer wall, the plurality of through holes corresponding to the plurality of battery cell mounting positions one by one, the through holes are used to expose the battery cells, and the anti-backflow plate is used to shield all the through holes.

[0014] In an optional embodiment, a protective plate is provided in each of the through holes, the protective plate is adjacent to the explosion-proof valve of the battery cell, the periphery of the protective plate is sealed to the circumferential inner wall of the through hole, and the thickness of the protective plate is less than the length of the through hole;

[0015] Among them, in the case of thermal runaway of some of the battery cells, the thermal runaway products of the battery cells are used to sequentially break through some of the protective plates and part of the structure of the anti-backflow plate, and the remaining protective plates prevent the thermal runaway products from flowing back to the explosion-proof valves of the remaining battery cells.

[0016] In an optional embodiment, the thickness of the protective plate is 0.05-1 mm.

[0017] In a second aspect, the utility model provides a battery pack, comprising a battery pack shell and a battery module as described in any one of the aforementioned embodiments, wherein the battery module is arranged in the battery pack shell.

[0018] In an optional embodiment, the battery pack housing has a pressure relief port, and the backflow prevention plate is spaced from the bottom wall of the battery pack housing;

[0019] The battery pack further includes a first flow guide beam, which is disposed on the inner side wall of the battery pack shell, the anti-backflow plate, the battery pack shell and the first flow guide beam jointly define a first pressure relief cavity, the first flow guide beam is provided with a first flow guide hole and a first flow guide channel connected to the first flow guide hole, and the first pressure relief cavity, the first flow guide hole, the first flow guide channel and the pressure relief port are connected in sequence;

[0020] Wherein, the first flow guide hole and the pressure relief port are staggered in distribution.

[0021] In an optional embodiment, the number of the battery modules is multiple, the battery pack housing has a pressure relief port, and the backflow prevention plate is spaced from the bottom wall of the battery pack housing;

[0022] The battery pack further includes a second guide beam, which is arranged between adjacent battery modules, and the anti-backflow plates of adjacent battery modules, the battery pack housing and the second guide beam jointly define a second pressure relief chamber and a third pressure relief chamber;

[0023] The second guide beam is provided with a second guide hole, a third guide hole and a second guide channel, the second guide hole and the third guide hole are both connected to the second guide channel, the third pressure relief chamber, the third guide hole, the second guide channel, the second guide hole, the second pressure relief chamber and the pressure relief port are connected in sequence;

[0024] Wherein, the second guide holes and the third guide holes are staggered in distribution.

[0025] In an optional embodiment, the battery pack further includes a heat insulation plate, which is disposed in the battery pack shell, and the heat insulation plate and the anti-backflow plate are spaced apart.

[0026] The beneficial effects of the battery module and battery pack of the embodiments of the utility model include, for example:

[0027] The utility model provides a battery module, which includes a battery cell tray, an anti-backflow plate and multiple battery cells. The battery cell tray has a bottom wall and an outer wall opposite to each other. The bottom wall is provided with multiple battery cell installation positions, each battery cell is arranged in each battery cell installation position, and the explosion-proof valve of the battery cell is located in the battery cell installation position. The anti-backflow plate is arranged on the outer wall of the battery cell tray, wherein, in the case of thermal runaway of some battery cells, the thermal runaway products of the battery cells break through the partial structure of the anti-backflow plate, and the remaining structure of the anti-backflow plate prevents the thermal runaway products from flowing back to the explosion-proof valves of the remaining battery cells, thereby avoiding a thermal runaway chain reaction caused by temperature increase or short circuit of other battery cells in the case of thermal runaway of some battery cells.

[0028] The utility model provides a battery pack, which comprises a battery pack shell and the above-mentioned battery module, wherein the battery module is arranged in the battery pack shell, and the battery pack has all the functions of the above-mentioned battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of a battery pack provided in an embodiment of the present utility model;

[0031] Figure 2 An exploded view of a partial structure of a battery pack provided in an embodiment of the present utility model;

[0032] Figure 3 A schematic diagram of a battery tray and a battery cell provided in an embodiment of the utility model;

[0033] Figure 4 A schematic diagram of a battery cell tray and a backflow prevention plate provided in an embodiment of the utility model;

[0034] Figure 5 A schematic diagram of an anti-backflow plate provided in an embodiment of the utility model;

[0035] Figure 6 A schematic diagram of a hollow hole of a backflow prevention plate provided in an embodiment of the utility model;

[0036] Figure 7 A schematic diagram of a notched groove of a backflow prevention plate provided in an embodiment of the utility model;

[0037] Figure 8 A schematic diagram of a through hole and a protective plate of a battery cell tray provided in an embodiment of the utility model;

[0038] Fig. 9 A schematic diagram of a first flow guide hole and a pressure relief port provided in an embodiment of the utility model;

[0039] Fig.10 It is a cross-sectional view of a battery pack provided in an embodiment of the present utility model.

[0040] Icons: 1000-battery module; 100-battery cell tray; 110-battery cell installation position; 200-battery cell; 300-anti-backflow plate; 310-hollow hole; 320-notched groove; 301-through hole; 302-protective plate; 2100-battery pack shell; 2110-pressure relief port; 2120-second pressure relief chamber; 2200-first guide beam; 2210-first guide hole; 2300-second guide beam; 2310-third guide hole; 2400-heat insulation board. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0044] In the description of the present utility model, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present utility model.

[0045] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0046] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0047] As mentioned in the background technology, in the prior art, most of the technologies for thermal runaway protection are for protecting the entire battery pack from thermal runaway, such as sticking whole pieces of mica sheets, aerogels and other heat-resistant materials on the upper cover and the bottom of the lower box of the battery box to prevent the battery cells from burning through the upper and lower shells after thermal runaway.

[0048] However, this method can only relatively delay the time it takes for the thermal runaway of the battery cell to spread to the outside of the entire package. It cannot prevent some battery cells from experiencing thermal runaway or short circuits due to the contact of flames, hot air flows, molten materials, etc. ejected from the thermal runaway with other normal battery cells, which ultimately causes the temperature of other battery cells to rise, causing a chain reaction in other battery cells.

[0049] In view of this, please refer to Figure 1-Figure 10 The battery module 1000 and the battery pack provided in the embodiment of the utility model can solve this problem, which will be described in detail below.

[0050] Please refer to Figure 1 and Figure 2 A battery pack is provided in an embodiment of the utility model, which includes a battery pack shell 2100 and a battery module 1000. The battery module 1000 is arranged in the battery pack shell 2100. The battery module 1000 can avoid a thermal runaway chain reaction caused by temperature increase or short circuit of other battery cells 200 when some battery cells 200 have thermal runaway.

[0051] Please continue to refer to Figure 3-Figure 5Specifically, the battery module 1000 includes a battery cell tray 100, an anti-backflow plate 300 and a plurality of battery cells 200. The battery cell tray 100 has a bottom wall and an outer wall facing each other. The bottom wall is provided with a plurality of battery cell mounting positions 110. Each battery cell 200 is arranged in each battery cell mounting position 110, and the explosion-proof valve of the battery cell 200 is located in the battery cell mounting position 110. The anti-backflow plate 300 is arranged on the outer wall of the battery cell tray 100.

[0052] Among them, in the case of thermal runaway of some battery cells 200, the thermal runaway products of the battery cells 200 break through the partial structure of the anti-backflow plate 300, and the remaining structure of the anti-backflow plate 300 prevents the thermal runaway products from flowing back to the explosion-proof valves of the remaining battery cells 200, thereby avoiding the thermal runaway chain reaction caused by the temperature increase or short circuit of other battery cells 200 in the case of thermal runaway of some battery cells 200.

[0053] It should be noted that the thermal runaway products mentioned here can be understood as flames, hot air flows, molten materials, etc. ejected after the battery cell 200 thermally runs away.

[0054] The backflow prevention plate 300 can be made of mica sheets or aerogel glass fiber boards, and the backflow prevention plate 300 can also play a heat insulation role.

[0055] Please refer to Figure 6 Specifically, in some embodiments, in order to facilitate the thermal runaway products of the battery cell 200 to break through the anti-backflow plate 300 and enter the pressure relief chamber of the battery pack, the anti-backflow plate 300 has a plurality of anti-backflow areas, and the plurality of anti-backflow areas correspond one to one to the plurality of battery cells 200, and each anti-backflow area is provided with at least one hollow hole 310.

[0056] The hollow hole 310 can be provided to prevent the thermal runaway products from breaking through the anti-backflow plate 300 in the anti-backflow area adjacent to the thermal runaway battery cell 200 in the event of thermal runaway, so that the thermal runaway products are discharged into the pressure relief chamber. At the same time, the anti-backflow plates 300 in the anti-backflow area adjacent to the remaining battery cells 200 that have not experienced thermal runaway will not break, thereby preventing the thermal runaway products from flowing back (which can be understood as the thermal runaway products being rebounded by the battery pack shell 2100 in the pressure relief chamber) to the explosion-proof valves of the remaining battery cells 200, thereby avoiding a thermal runaway chain reaction caused by temperature increase or short circuit in other battery cells 200 in the event of thermal runaway of some battery cells 200.

[0057] The number of hollow holes 310 in each anti-backflow area can be one, two, three or four, etc. For example, in the present embodiment, the number of hollow holes 310 in each anti-backflow area is four, each hollow hole 310 is arc-shaped, and the centers of the four arc-shaped hollow holes 310 can be the same point.

[0058] Please refer to Figure 7In some embodiments, each anti-reflux area may be provided with at least one notch groove 320 .

[0059] The notched groove 320 can be provided to facilitate, in the event of thermal runaway of the battery cell 200, the thermal runaway products to break through the anti-backflow plate 300 in the anti-backflow area adjacent to the thermal runaway battery cell 200, so that the thermal runaway products are discharged into the pressure relief chamber. At the same time, the anti-backflow plates 300 in the anti-backflow area adjacent to the remaining battery cells 200 that have not experienced thermal runaway will not break, and the thermal runaway products can be prevented from flowing back to the explosion-proof valves of the remaining battery cells 200, thereby avoiding a thermal runaway chain reaction caused by temperature increase or short circuit of other battery cells 200 in the event of thermal runaway of some battery cells 200.

[0060] The number of notched grooves 320 in each anti-reflux area may be one, two, three or four, etc. For example, in the present embodiment, the number of notched grooves 320 in each anti-reflux area is two, and the two intersecting notched grooves 320 together form a cross shape. Of course, in other embodiments, there may also be a straight-line notched groove 320, a U-shaped notched groove 320, a circular notched groove 320, etc.

[0061] It should be noted that providing the notched groove 320 is equivalent to squeezing a local area of ​​the backflow plate in each anti-backflow area to thin the local area of ​​the backflow plate, so that in the event of thermal runaway of the battery cell 200, the thermal runaway product can break through the anti-backflow plate 300 in the anti-backflow area adjacent to the thermal runaway battery cell 200. In addition, it should be noted that in the present embodiment, the notched groove 320 is located on the side of the anti-backflow plate 300 away from the battery cell tray 100.

[0062] It should be noted that in some embodiments, for example, when the backflow prevention plate 300 may be made of mica sheet, since the mica sheet material is relatively brittle, the notched groove 320 or the hollow hole 310 may not be provided on the backflow prevention plate 300 .

[0063] Please refer to Figure 8 In addition, it should be noted that, in the present embodiment, the battery cell tray 100 is provided with a plurality of through holes 301, the through holes 301 connect the bottom wall and the outer wall, the plurality of through holes 301 correspond one to one with the plurality of battery cell mounting positions 110, and the through holes 301 are used to expose the ends of the battery cells 200, and at the same time, can facilitate the discharge of thermal runaway products in the event of thermal runaway of the battery cells 200.

[0064] Among them, the anti-backflow plate 300 is used to shield all the through holes 301. In the case of thermal runaway of some battery cells 200, the thermal runaway products of the battery cells 200 pass through the adjacent through holes 301 and break through part of the structure of the anti-backflow plate 300. The remaining structure of the anti-backflow plate 300 prevents the thermal runaway products from flowing back through the remaining through holes 301 to the explosion-proof valves of the remaining battery cells 200, thereby avoiding a thermal runaway chain reaction caused by temperature increase or short circuit of other battery cells 200 in the case of thermal runaway of some battery cells 200.

[0065] Of course, in some embodiments, a protective plate 302 is provided in each through hole 301, the protective plate 302 is adjacent to the explosion-proof valve of the battery cell 200, the periphery of the protective plate 302 is sealed and connected to the circumferential inner wall of the through hole 301, and the thickness of the protective plate 302 is less than the length of the through hole 301.

[0066] It is easy to understand that the through hole 301 is a circular through hole 301, the protective plate 302 is a circular plate body, and the axis of the through hole 301 is perpendicular to the protective plate 302. In the case of thermal runaway of some battery cells 200, the thermal runaway products of the battery cells 200 are used to successively break through some of the protective plates 302 and part of the structure of the anti-reflux plate 300, and the remaining protective plates 302 prevent the thermal runaway products from flowing back to the explosion-proof valves of the remaining battery cells 200, resulting in thermal runaway of the remaining battery cells 200.

[0067] Specifically, in this embodiment, the thickness of the protective plate 302 is 0.05-1 mm. The thickness of the protective plate 302 may be 0.05 mm. Of course, the thickness of the protective plate 302 may also be 1 mm. The thickness of the protective plate 302 may also be 0.55 mm.

[0068] It should be noted that, in other embodiments, the thickness of the protective plate 302 may also be other values, which may be adjusted based on experiments on the opening pressure of explosion-proof valves of different battery cells.

[0069] In addition, the thickness of the protective plate 302 can be understood as the length dimension of the protective plate 302 in the axial direction of the through hole 301. The thickness of the protective plate 302 is smaller than the length dimension of the through hole 301 in the axial direction of the through hole 301. It is easy to understand that in this embodiment, it is equivalent to that the battery cell tray 100 is provided with a plurality of blind holes (formed together by the through hole 301 and the protective plate 302) instead of being arranged as a circular through hole 301.

[0070] Please refer to Fig. 9 and Fig.10 Combined with Figure 2 In addition, in order to prevent the flame from directly spraying out of the battery pack shell 2100 in the event of thermal runaway of the battery cell 200, in the present embodiment, the battery pack shell 2100 has a pressure relief port 2110, and the backflow prevention plate 300 is spaced from the bottom wall of the battery pack shell 2100.

[0071] The battery pack also includes a first guide beam 2200, which is disposed on the inner wall of the battery pack shell 2100. The first guide beam 2200 is adjacent to the pressure relief port 2110. The backflow prevention plate 300, the battery pack shell 2100 and the first guide beam 2200 jointly define a first pressure relief chamber.

[0072] The first guide beam 2200 is provided with a first guide hole 2210 and a first guide channel connected to the first guide hole 2210 , and the first pressure relief chamber, the first guide hole 2210 , the first guide channel and the pressure relief port 2110 are connected in sequence, wherein the first guide hole 2210 and the pressure relief port 2110 are staggered.

[0073] Here, the first guide hole 2210 is an elliptical through hole 301, and the first guide hole 2210 is arranged on the guide hole side plate of the first guide beam 2200 which is located in the same plane. Here, the plane where the guide hole side plate is located is taken as the first reference plane. The staggered distribution of the first guide hole 2210 and the pressure relief port 2110 can be understood as the projection of the first guide hole 2210 in the straight line direction perpendicular to the first reference plane and the projection of the pressure relief port 2110 in the straight line direction perpendicular to the first reference plane are spaced to avoid the flame from directly spraying out of the shell through the pressure relief port 2110.

[0074] Specifically, the first guide beam 2200 has a shielding effect on the pressure relief port 2110 and can play a certain role in disturbing the flow.

[0075] In this embodiment, the number of the first guide holes 2210 can be multiple, and the number of the first guide beams 2200 is two. The two first guide beams 2200 are respectively located on both sides of the battery pack shell 2100, and pressure relief ports 2110 are provided on both sides of the battery pack shell 2100.

[0076] It should be noted that the battery pack shell 2100 here can be understood as the lower shell of the battery pack.

[0077] In addition, it should be noted that in the present embodiment, the number of battery modules 1000 is multiple, and the battery pack also includes a second guide beam 2300, and a second guide beam 2300 is arranged between adjacent battery modules 1000. The anti-backflow plates 300 of adjacent battery modules 1000, the battery pack shell 2100 and the second guide beam 2300 jointly define a second pressure relief chamber 2120 and a third pressure relief chamber.

[0078] The second guide beam 2300 is provided with a second guide hole, a third guide hole 2310 and a second guide channel. The second guide hole and the third guide hole 2310 are located on two parallel side walls of the second guide beam 2300 (the first side wall plate and the second side wall plate, respectively). The second guide hole and the third guide hole 2310 are both connected to the second guide channel. The third pressure relief chamber, the third guide hole 2310, the second guide channel, the second guide hole, the second pressure relief chamber 2120 and the pressure relief port 2110 are connected in sequence. The second guide hole and the third guide hole 2310 are staggered, which can not only guide the hot air flow, but also block the explosion-proof material (which can be understood as the above-mentioned thermal runaway product) ejected after the thermal runaway of the battery cell 200, and prevent the explosion-proof material from moving to the battery cell 200 of the adjacent battery module 1000, causing thermal runaway or blocking the external pressure relief valve of the battery pack.

[0079] In this embodiment, the number of battery modules 1000 is two, the number of second flow guide beam 2300 is one, and the second flow guide beam 2300 is located in the middle of the battery pack shell 2100 and between the two first flow guide beams 2200 .

[0080] The two battery modules 1000 are respectively arranged between one of the first flow guide beams 2200 and the first side wall plate of the second flow guide beam 2300 in the middle, and between the other first flow guide beam 2200 and the second side wall plate of the second flow guide beam 2300 in the middle.

[0081] At this time, the third pressure relief chamber, the third flow guide hole 2310, the second flow guide channel, the second flow guide hole, the second pressure relief chamber 2120, the first flow guide hole 2210 of one of the first flow guide beams 2200, the first flow guide channel and the pressure relief port 2110 on one side are connected in sequence, or, it can also be understood that the second pressure relief chamber 2120, the second flow guide hole, the second flow guide channel, the third flow guide hole 2310, the third pressure relief chamber, the first flow guide hole 2210 of another first flow guide beam 2200, the first guide channel and the pressure relief port 2110 on the other side are connected in sequence.

[0082] Among them, the planes where the first side wall plate and the second side wall plate are located are the second reference plane and the third reference plane respectively. The staggered distribution of the second guide hole and the third guide hole 2310 here can be understood as that the first projection of the second guide hole along the straight line direction perpendicular to the second reference plane and the second projection of the third guide hole 2310 along the straight line direction perpendicular to the third reference plane partially intersect or are spaced apart. The partial intersection here does not include the first projection being within the second projection, or the second projection being within the first projection.

[0083] In other embodiments, the number of battery modules 1000 is three, the number of second guide beams 2300 is two, the two second guide beams 2300 are spaced apart, and the two second guide beams 2300 are located between the two first guide beams 2200. In this case, a battery module 1000 is arranged between two adjacent second guide beams 2300, and the remaining two battery modules 1000 are arranged between one of the first guide beams 2200 and one of the second guide beams 2300, and between another first guide beam 2200 and another second guide beam 2300.

[0084] For the convenience of description, the first pressure relief chamber, the second pressure relief chamber 2120 and the third pressure relief chamber mentioned above may be collectively referred to as the pressure relief chamber of the battery pack.

[0085] In addition, in some embodiments, the battery pack also includes a heat insulation plate 2400, which is disposed in the battery pack shell 2100, wherein the heat insulation plate 2400, two first guide beams 2200, one second guide beam 2300, the battery pack shell 2100 and the anti-backflow plate 300 at the bottom of the two battery modules 1000 can jointly define a second pressure relief chamber 2120 and a third pressure relief chamber.

[0086] The heat insulation board 2400 and the anti-backflow board 300 are distributed at intervals. The material of the heat insulation board 2400 can be mica, aerogel, glass fiber board, fire blanket, etc. The heat insulation board 2400 can prevent the battery cell 200 from burning through the battery pack shell 2100 when thermal runaway occurs.

[0087] In the event of thermal runaway of a battery cell 200, the thermal runaway products break through the anti-backflow plate 300 in the anti-backflow area adjacent to the thermal runaway battery cell 200, allowing the thermal runaway products to be discharged into the pressure relief chamber. At the same time, the anti-backflow plates 300 in the anti-backflow area adjacent to the remaining battery cells 200 that have not experienced thermal runaway will not break, thereby preventing the thermal runaway products from flowing back (here it can be understood that the thermal runaway products are rebounded by the insulation plate 2400 in the pressure relief chamber) to the explosion-proof valves of the remaining battery cells 200, thereby avoiding a thermal runaway chain reaction caused by temperature increase or short circuit in other battery cells 200 in the event of thermal runaway of some battery cells 200.

[0088] To summarize, the battery module 1000 includes a battery cell tray 100, an anti-backflow plate 300 and a plurality of battery cells 200. The battery cell tray 100 has a bottom wall and an outer wall facing each other. The bottom wall is provided with a plurality of battery cell mounting positions 110. Each battery cell 200 is arranged in each battery cell mounting position 110, and the explosion-proof valve of the battery cell 200 is located in the battery cell mounting position 110. The anti-backflow plate 300 is arranged on the outer wall of the battery cell tray 100.

[0089] Among them, in the case of thermal runaway of some battery cells 200, the thermal runaway products of the battery cells 200 break through the partial structure of the anti-backflow plate 300, and the remaining structure of the anti-backflow plate 300 prevents the thermal runaway products from flowing back to the explosion-proof valves of the remaining battery cells 200, thereby avoiding the thermal runaway chain reaction caused by the temperature increase or short circuit of other battery cells 200 in the case of thermal runaway of some battery cells 200.

[0090] The battery pack includes a battery pack housing 2100 and the above-mentioned battery module 1000 . The battery module 1000 is disposed in the battery pack housing 2100 . The battery pack has all the functions of the above-mentioned battery module 1000 .

[0091] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A battery module, characterized in that: include: A battery cell tray (100), the battery cell tray (100) having a bottom wall and an outer wall facing each other, the bottom wall being provided with a plurality of battery cell installation positions (110); A plurality of battery cells (200), each of the battery cells (200) being arranged in each of the battery cell installation positions (110), and an explosion-proof valve of the battery cell (200) being located in the battery cell installation position (110); as well as A backflow prevention plate (300), the backflow prevention plate (300) being arranged on the outer wall of the battery cell tray (100); Wherein, in the case of thermal runaway of some of the battery cells (200), the thermal runaway products of the battery cells (200) break through a partial structure of the anti-backflow plate (300), and the remaining structure of the anti-backflow plate (300) prevents the thermal runaway products from flowing back to the explosion-proof valves of the remaining battery cells (200).

2. The battery module according to claim 1, characterized in that: The anti-backflow plate (300) has a plurality of anti-backflow areas, the plurality of anti-backflow areas correspond to the plurality of battery cells (200) in a one-to-one manner, and each anti-backflow area is provided with at least one hollow hole (310).

3. The battery module according to claim 1, characterized in that: The anti-backflow plate (300) has a plurality of anti-backflow areas, the plurality of anti-backflow areas correspond to a plurality of battery cells (200) in a one-to-one manner, and each anti-backflow area is provided with at least one notch groove (320).

4. The battery module according to claim 1, characterized in that: The battery cell tray (100) is provided with a plurality of through holes (301), the through holes (301) connecting the bottom wall and the outer wall, the plurality of through holes (301) corresponding to the plurality of battery cell installation positions (110) one by one, the through holes (301) being used to expose the battery cells (200), and the backflow prevention plate (300) being used to shield all the through holes (301).

5. The battery module according to claim 4, characterized in that: A protective plate (302) is provided in each through hole (301), the protective plate (302) is adjacent to the explosion-proof valve of the battery cell (200), the periphery of the protective plate (302) is sealed to the circumferential inner wall of the through hole (301), and the thickness of the protective plate (302) is less than the length of the through hole (301); Wherein, in the event of thermal runaway of some of the battery cells (200), the thermal runaway products of the battery cells (200) are used to sequentially break through some of the protective plates (302) and part of the structure of the anti-backflow plate (300), and the remaining protective plates (302) prevent the thermal runaway products from flowing back to the explosion-proof valves of the remaining battery cells (200).

6. The battery module according to claim 5, characterized in that: The thickness of the protective plate (302) is 0.05-1 mm.

7. A battery pack, characterized in that: It comprises a battery pack shell (2100) and the battery module according to any one of claims 1 to 6, wherein the battery module is arranged in the battery pack shell (2100).

8. The battery pack according to claim 7, characterized in that: The battery pack housing (2100) has a pressure relief port (2110), and the backflow prevention plate (300) is spaced from the bottom wall of the battery pack housing (2100); The battery pack further comprises a first flow guide beam (2200), the first flow guide beam (2200) being arranged on the inner side wall of the battery pack shell (2100), the anti-backflow plate (300), the battery pack shell (2100) and the first flow guide beam (2200) jointly defining a first pressure relief chamber, the first flow guide beam (2200) being provided with a first flow guide hole (2210) and a first flow guide channel communicating with the first flow guide hole (2210), the first pressure relief chamber, the first flow guide hole (2210), the first flow guide channel and the pressure relief port (2110) being communicated in sequence; Wherein, the first flow guide hole (2210) and the pressure relief port (2110) are staggered in distribution.

9. The battery pack according to claim 7, characterized in that: The number of the battery modules is multiple, the battery pack housing (2100) has a pressure relief port (2110), and the backflow prevention plate (300) is spaced from the bottom wall of the battery pack housing (2100); The battery pack further comprises a second flow guide beam (2300), the second flow guide beam (2300) being arranged between adjacent battery modules, and the anti-backflow plates (300) of adjacent battery modules, the battery pack housing (2100) and the second flow guide beam (2300) jointly define a second pressure relief chamber (2120) and a third pressure relief chamber; The second flow guide beam (2300) is provided with a second flow guide hole, a third flow guide hole (2310) and a second flow guide channel, the second flow guide hole and the third flow guide hole (2310) are both connected to the second flow guide channel, and the third pressure relief chamber, the third flow guide hole (2310), the second flow guide channel, the second flow guide hole, the second pressure relief chamber (2120) and the pressure relief port (2110) are connected in sequence; Wherein, the second guide hole and the third guide hole (2310) are staggered in distribution.

10. The battery pack according to claim 7, characterized in that: The battery pack further comprises a heat insulation plate (2400), wherein the heat insulation plate (2400) is arranged in the battery pack housing (2100), and the heat insulation plate (2400) and the anti-backflow plate (300) are spaced apart.

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