Soft package battery cell assembly and battery pack with same

Abstract

The utility model discloses a soft package battery cell assembly and a battery pack with the soft package battery cell assembly, the soft package battery cell assembly comprises a battery cell and an insulating heat-resistant protection part, the battery cell is provided with an exhaust pressure relief structure, the insulating heat-resistant protection part wraps the outer side of the battery cell, and a tab of the battery cell extends out of the insulating heat-resistant protection part. The insulating heat-resistant protection piece is provided with an exhaust port corresponding to the exhaust pressure relief structure, so that when the battery cell is in thermal runaway, eruption substances of the battery cell are sequentially exhausted from the exhaust pressure relief structure and the exhaust port; wherein the tab and the exhaust pressure relief structure are respectively arranged on different sides of the battery cell. According to the soft package battery cell assembly, when the battery cells are subjected to thermal runaway, heat is not easily conducted to the adjacent battery cells, so that the probability of heat spreading in the battery is reduced, the structures of the adjacent battery cells are not easily damaged by high-temperature flue gas, the use safety of the battery is improved, and the service life of the battery is prolonged. Meanwhile, the tabs and the exhaust pressure relief structure are respectively arranged on different sides of the battery cell, so that the reliability and the stability of electric connection of the tabs in the battery are protected.

Description

TECHNICAL FIELD

[0001] The present disclosure generally relates to the technical field of battery thermal runaway, and in particular to a soft package battery cell assembly and a battery pack with the same. BACKGROUND

[0002] Since small power battery packs have high requirements for energy density, soft package batteries are usually used for grouping.

[0003] However, when thermal runaway occurs in one battery cell in the soft package battery, the battery cell can cause thermal runaway of adjacent battery cells through heat conduction, thereby causing thermal spread inside the battery. At the same time, high-temperature flue gas generated by the thermal runaway of the battery cell can damage the structure of the adjacent battery cell, affecting the use safety and service life of the battery. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of soft package battery cell assembly and the battery pack with the same, so that when thermal runaway occurs in battery cell, heat is not easy to be conducted to adjacent battery cell, thereby reducing the probability of thermal spread inside the battery, high-temperature flue gas is not easy to damage the structure of adjacent battery cell, improve the use safety of battery, prolong the service life of battery. At the same time, tab and exhaust pressure relief structure are respectively arranged on different sides of battery cell, to protect the reliability and stability of the electrical connection of the tab inside the battery.

[0005] In a first aspect, the utility model provides a kind of soft package battery cell assembly, comprising:

[0006] Battery cell, the battery cell is provided with exhaust pressure relief structure;

[0007] Insulating heat-resistant protective member, the insulating heat-resistant protective member is covered on the outside of the battery cell, and the tab of the battery cell extends out of the insulating heat-resistant protective member, the insulating heat-resistant protective member is provided with exhaust port corresponding to the exhaust pressure relief structure, so that the spewing material of battery cell is sequentially discharged by exhaust pressure relief structure and exhaust port when thermal runaway occurs in the battery cell;Wherein, the tab and the exhaust pressure relief structure are respectively arranged on different sides of the battery cell.

[0008] As a realizable mode, the battery cell includes a pole piece group and a packaging layer covered on the outside of the pole piece group, the packaging layer includes at least three sealing edges, the sealing edges correspond to the edges of the pole piece group, one of the sealing edges is an exhaust pressure relief sealing edge, the edge of the pole piece group corresponding to the exhaust pressure relief sealing edge is a first corresponding edge, and the edges of the pole piece group corresponding to the remaining sealing edges are second corresponding edges;

[0009] The distance between at least part of the area of the exhaust pressure relief sealing edge and the first corresponding edge is greater than the distance between the remaining sealing edges and the second corresponding edges, to form a gas-containing space between the exhaust pressure relief sealing edge and the first corresponding edge, thereby constituting the exhaust pressure relief structure.

[0010] As a possible implementation, the exhaust pressure relief edge includes a first edge segment spaced apart from the first corresponding edge, and a second edge segment connected to both ends of the first edge segment and respectively folded towards the first corresponding edge.

[0011] As a possible implementation, the tab and the exhaust pressure relief structure are respectively arranged on opposite sides of the battery cell.

[0012] In a second aspect, the utility model provides a kind of, including box and soft package battery cell assembly in above-mentioned embodiment, the box has accommodating cavity;Multiple soft package battery cell assemblies are sequentially stacked in the accommodating cavity along first direction, and form exhaust passage with the box, and the exhaust port is towards the exhaust passage arrangement.

[0013] As a possible implementation, the box includes a first side and a second side arranged opposite to each other, and a third side connected to the first side and the second side, the exhaust port is towards the first side, and the tab is towards the second side.

[0014] Each of the third side corresponds to at least two barrier members arranged at intervals, the barrier member extends along the first direction to separate the space between the plurality of soft package battery cell assemblies and the box into a first space including the tab, a second space including the exhaust port, and a third space between the first space and the second space.

[0015] The first space is filled with thermal insulation glue.

[0016] The second space is filled with thermal conductive glue.

[0017] As a possible implementation, the box between adjacent two barrier members is provided with at least one first groove, the first groove extends along the first direction, and at least one end penetrates.

[0018] As a possible implementation, a thermal insulation layer is provided between adjacent two soft package battery cell assemblies; and / or, a buffer layer is provided between adjacent two soft package battery cell assemblies.

[0019] As a possible implementation, the side of the box towards the exhaust port is provided with a first thermal insulation plate; the box is further provided with a second thermal insulation plate and a third thermal insulation plate at intervals along the first direction, and the plurality of soft package battery cell assemblies are arranged between the second thermal insulation plate and the third thermal insulation plate.

[0020] As a possible implementation, the box includes a body having a first opening, and a top plate connected to the first opening, the body includes the first side, the second side and the third side.

[0021] The box further comprises a cover connected to the first opening and forming a mounting cavity with the top plate, and the battery management system is mounted in the mounting cavity;

[0022] The cover has a sticking area on the side away from the mounting cavity, and a waterproof and breathable layer is attached to the sticking area, the sticking area has a recessed pit towards the mounting cavity, a through hole is arranged in the recessed pit, and the sticking area further has a second groove connecting the recessed pit and the edge of the sticking area.

[0023] The above scheme sets the exhaust pressure relief structure on the battery cell, so that when the battery cell is in thermal runaway, the smoke can be collected and discharged by the exhaust pressure relief structure, and is not easy to flow randomly and damage the adjacent battery cell, thereby protecting the adjacent battery cell. By arranging the insulating and heat-resistant protective member covering the outside of the battery cell, when the battery cell is in thermal runaway, heat is not easy to be conducted from the thermal runaway battery cell to the battery cell that does not occur thermal runaway, thereby reducing the probability of thermal spread in the battery and improving the use safety and service life of the battery. At the same time, the tab and the exhaust pressure relief structure are respectively arranged on different sides of the battery cell, thereby protecting the reliability and stability of the electrical connection of the tab in the battery. BRIEF DESCRIPTION OF DRAWINGS

[0024] Other features, objects, and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the drawings:

[0025] Figure 1 A structural schematic diagram of a battery assembly of an embodiment of the application;

[0026] Figure 2 A partial exploded view of a battery cell of a battery assembly of an embodiment of the application;

[0027] Figure 3 A structural schematic diagram of a battery assembly of an embodiment of the application;

[0028] Figure 4 An exploded view of a battery pack of an embodiment of the application;

[0029] Figure 5 A sectional view of a battery pack of an embodiment of the application;

[0030] Figure 6 A structural schematic diagram of the internal structure of a battery pack of an embodiment of the application;

[0031] Figure 7 A bottom view of a battery pack of an embodiment of the application;

[0032] Figure 8 A Figure 5 enlarged view of A in FIG. 8;

[0033] Figure 9A structural schematic diagram of a cover of a battery pack according to an embodiment of the application;

[0034] Figure 10 A schematic diagram of a cover of a battery pack according to an embodiment of the application pasting a waterproof and breathable layer.

[0035] Legend:

[0036] The soft package battery cell assembly 100, the battery cell 10, the exhaust pressure relief structure 11, the pole piece group 12, the first corresponding edge 121, the second corresponding edge 122, the pole lug 123, the packaging layer 13, the edge 131, the exhaust pressure relief edge 132, the first edge segment 132a, the second edge segment 132b, the insulation heat-resistant protection piece 20, the exhaust port 21,

[0037] The battery pack 1000, the box body 200, the main body 30, the first side surface 31, the explosion-proof valve 311, the first heat insulation plate 312, the second side surface 32, the third side surface 33, the blocking piece 331, the first groove 34, the first space 35, the third space 36, the exhaust passage 37, the second space 38, the top plate 40, the second heat insulation plate 41, the bottom plate 50, the third heat insulation plate 51, the heat insulation layer 60, the buffer layer 70, the cover 80, the mounting cavity 80a, the battery management system 81, the pasting area 82, the pit 821, the through hole 822, the second groove 823, the waterproof and breathable layer 83. DETAILED DESCRIPTION

[0038] The application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only for the purpose of explaining the related utility model, and not for limiting the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for the convenience of description.

[0039] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict.

[0040] The terms used in the application are only for the purpose of describing specific embodiments, and are not intended to limit the application. The singular forms "a", "said" and "the" used in the application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein means and includes any or all possible combinations of one or more associated listed items.

[0041] As Figures 1-3 shown, the battery cell 10 assembly 100 provided by the utility model embodiment comprises a battery cell 10, and the battery cell 10 is provided with an exhaust pressure relief structure 11.

[0042] The exhaust pressure relief structure 11 is used to discharge the flue gas when the battery cell 10 is in thermal runaway, guide the flue gas, and avoid damage to the adjacent battery cell 10 caused by the random flow of the flue gas.

[0043] The battery cell 10 assembly 100 further comprises an insulating heat-resistant protective piece 20, which is wrapped on the outside of the battery cell 10 and can play a heat insulation and insulation role. In this way, when the battery cell 10 is in thermal runaway, the heat is not easy to conduct outwards and spread to the adjacent battery cell 10. At the same time, when the battery cell 10 is damaged, it is not easy to conduct electricity with the conductive part of other battery cells 10, thereby improving the use safety of the battery.

[0044] The insulating heat-resistant protective piece 20 can be made of high molecular materials, ceramic materials, etc. In the present application, the insulating heat-resistant protective piece 20 is a mica sheet.

[0045] The tab 123 of the battery cell 10 extends out of the insulating heat-resistant protective piece 20 to facilitate electrical connection with the tab 123 of other battery cells 10. The tab 123 includes a positive tab 123 and a negative tab 123, which can be arranged on the same side or different sides of the battery cell 10. In the present application, the positive tab 123 and the negative tab 123 are arranged on the same side of the battery cell 10. The side of the insulating heat-resistant protective piece 20 corresponding to the tab 123 of the battery cell 10 is provided with a through hole 822 matched with the tab 123, so that the tab 123 extends out of the insulating heat-resistant protective piece 20.

[0046] The insulating heat-resistant protective piece 20 is provided with an exhaust port 21 corresponding to the exhaust pressure relief structure 11. In this way, when the battery cell 10 is in thermal runaway, the spewing material of the battery cell, such as flue gas, can be sequentially discharged from the exhaust pressure relief structure 11 and the exhaust port 21, facilitating the collection and discharge of the flue gas.

[0047] The tab 123 and the exhaust pressure relief structure 11 are arranged on different sides of the battery cell 10, so that the flue gas discharged from the exhaust pressure relief structure 11 is not easy to impact and damage the tab 123, thereby protecting the reliability and stability of the electrical connection of the tab 123 inside the battery. As shown in Figure 1 From the perspective of the large face of the battery cell 10, the tab 123 is arranged on the top side of the battery cell 10, and the exhaust pressure relief structure 11 is arranged on the bottom side of the battery cell 10.

[0048] It can be understood that when the battery cell 10 is in a rectangular structure, the tab 123 and the exhaust pressure relief structure 11 can be arranged on the adjacent two sides or opposite two sides of the battery cell 10.

[0049] The above scheme, as shown in Figures 1-3As shown, by setting the exhaust pressure relief structure 11 on the battery cell 10, when the battery cell 10 occurs thermal runaway, the smoke can be gathered and discharged by the exhaust pressure relief structure 11, and is not easy to flow randomly and damage the adjacent battery cell 10, thereby protecting the adjacent battery cell 10. By setting the insulation heat-resistant protective member 20 wrapped outside the battery cell 10, when the battery cell 10 occurs thermal runaway, the heat is not easy to be conducted from the thermal runaway battery cell 10 to the battery cell 10 which does not occur thermal runaway, thereby reducing the probability of heat spread inside the battery, and improving the use safety and service life of the battery.

[0050] As an implementation manner, as shown in Figure 1 and Figure 2 As shown, the battery cell 10 includes the pole piece group 12 and the packaging layer 13 wrapped outside the pole piece group 12, the packaging layer 13 includes at least three sealing edges 131, and the sealing edge 131 corresponds to the edge of the pole piece group 12, wherein one of the sealing edges 131 is the exhaust pressure relief sealing edge 132, the edge of the pole piece group 12 corresponding to the exhaust pressure relief sealing edge 132 is the first corresponding edge 121, and the edge of the pole piece group 12 corresponding to the remaining sealing edges 131 is the second corresponding edge 122.

[0051] By setting the packaging layer 13 outside the pole piece group 12, the possibility of physical damage, electric leakage and short circuit of the pole piece group 12 can be reduced, and the battery temperature can be effectively controlled, and the charging and discharging efficiency can be optimized.

[0052] The packaging layer 13 can wrap the pole piece group 12 by folding, and then the other three edges are sealed 131, or two packaging layers 13 can wrap the pole piece group 12 from both sides, and then the four edges are sealed 131. Each sealing edge 131 corresponds to an edge of the pole piece group 12. Any one of the three sealing edges 131 can be used as the exhaust pressure relief sealing edge 132.

[0053] At least part of the area of the exhaust pressure relief sealing edge 132 is farther away from the first corresponding edge 121 than the remaining sealing edges 131 are farther away from the second corresponding edge 122, so as to form a gas containing space between the exhaust pressure relief sealing edge 132 and the first corresponding edge 121, and form the exhaust pressure relief structure 11.

[0054] By setting a larger distance between at least part of the area of the exhaust pressure relief sealing edge 132 and the first corresponding edge 121, a gas containing space can be formed between the area and the first corresponding edge 121. When the battery occurs thermal runaway, the smoke can be gathered in the gas containing space. When the gas pressure of the gas containing space reaches a threshold value, the gas will break through the exhaust pressure relief sealing edge 132, thereby discharging at this place.

[0055] At least part of the area of the exhaust pressure relief sealing edge 132 can be parallel to the first corresponding edge 121 or at a certain angle. Preferably, at least part of the area of the exhaust pressure relief sealing edge 132 is parallel to the first corresponding edge 121.

[0056] The shape of the exhaust pressure relief edge 132 can be a regular shape, for example, a rectangle, a trapezoid, a triangle, a semicircle, etc., or an irregular shape.

[0057] As an implementation manner, as shown in Figure 1 and Figure 2 , the exhaust pressure relief edge 132 includes a first edge segment 132a spaced apart from the first corresponding edge 121, and a second edge segment 132b connected to both ends of the first edge segment 132a and folded towards the first corresponding edge 121, respectively.

[0058] By arranging the second edge segment 132b folded towards the first corresponding edge 121, the size of the first edge segment 132a is smaller than the distance between the two second edge segments 132b close to the first corresponding edge 121, which is beneficial for the gas to open the first edge segment 132a and perform exhaust pressure relief. At the same time, it can have a guiding effect when installing the insulation heat-resistant protective member 20, improving the installation efficiency.

[0059] In the present application, the second edge segment 132b is a straight line structure at a certain angle with the first edge segment 132a. Alternatively, the angle between the first edge segment 132a and the second edge segment 132b is an obtuse angle, for example, it can be 120°, 130°, 150°, 160°, etc.

[0060] In other embodiments, the second edge segment 132b can also be an arc or the like.

[0061] As an implementation manner, as shown in Figure 1 and Figure 2 , the tab 123 and the exhaust pressure relief structure 11 are arranged on opposite sides of the battery cell 10, respectively.

[0062] Arranging the tab 123 and the exhaust pressure relief structure 11 on opposite sides of the battery cell 10 respectively makes the flue gas discharged by the exhaust pressure relief structure 11 far away from the tab 123, further protecting the tab 123 from the high-temperature flue gas, and protecting the reliability and stability of the internal tab 123 electrical connection of the battery.

[0063] In a second aspect, as shown in Figure 4 and Figure 5 , the utility model provides a battery pack 1000, including box 200 and the battery cell 10 assembly 100 in above-mentioned embodiment, box 200 has accommodating cavity, and multiple battery cell 10 assembly 100 is sequentially stacked in accommodating cavity along first direction, and forms exhaust passage 37 with box 200, and exhaust port 21 is arranged towards exhaust passage 37.

[0064] The battery cell 10 assembly 100 is stacked in the accommodating cavity of the box 200, and the box 200 can further protect the battery cell 10 assembly 100. The battery cell 10 assembly 100 and the box 200 form an exhaust passage 37, and the exhaust port 21 of the battery cell 10 assembly 100 is arranged towards the exhaust passage 37, facilitating the gas to be discharged along the exhaust passage 37.

[0065] It can be understood that the first direction is the height direction of the box 200, so that the exhaust port 21 of the battery cell 10 assembly 100 can be arranged towards the side surface of the box 200, and the exhaust path can be lengthened.

[0066] In some embodiments, the exhaust passage 37 can be an exhaust pipe arranged in the accommodating cavity, or an exhaust space arranged between the exhaust port 21 and the box 200, etc.

[0067] As an implementation manner, as shown in the figure, Figures 4-6 The box 200 includes a first side surface 31 and a second side surface 32 arranged opposite to each other, and a third side surface 33 connecting the first side surface 31 and the second side surface 32, the exhaust port 21 is arranged towards the first side surface 31, and the tab 123 is arranged towards the second side surface 32.

[0068] The first side surface 31, the second side surface 32 and the third side surface 33 arranged opposite to each other form a rectangular space with both ends open, and the exhaust port 21 and the tab 123 are arranged on the first side surface 31 and the second side surface 32 arranged opposite to each other, so as to arrange the exhaust port 21 and the tab 123 opposite to each other.

[0069] In some embodiments, the first side surface 31, the second side surface 32 and the third side surface 33 can be rectangular structures with the same length and width.

[0070] Each third side surface 33 corresponds to at least two barrier pieces 331 arranged at intervals, and the barrier pieces 331 extend along the first direction, so as to divide the space between the plurality of battery cell 10 assemblies 100 and the box 200 into a first space 35 including the tab 123, a second space 38 including the exhaust port 21, and a third space 36 between the first space 35 and the second space 38.

[0071] It can be understood that, in order to divide the space between the plurality of battery cell 10 assemblies 100 and the box 200 into the first space 35, the second space 38 and the third space 36 by the barrier pieces 331, the barrier pieces 331 extend along the first direction and extend to the upper edge and the lower edge of the third side surface 33, and the barrier pieces 331 are in abutment with the battery cell 10 assembly 100 and the box 200 on both sides.

[0072] Each third side surface 33 can be provided with two or more than two blocking pieces 331 extending along the first direction to divide the third side surface 33 into at least three regions, wherein the region close to the tab 123 is located in the first space 35 with the second side surface 32, the region close to the exhaust is located in the second space 38 with the first side surface 31, and the middle region is located in the third space 36.

[0073] In some embodiments, the blocking piece 331 is a cuboid strip structure. The blocking piece 331 can be a flexible piece.

[0074] In some embodiments, as shown in the first space 35 is filled with a heat insulation glue; and the second space 38 is filled with a heat conduction glue. Figure 7

[0075] Since the tab 123 is located in the first space 35, filling the first space 35 with the heat insulation glue can avoid heat transfer to the tab 123, and at the same time, the heat insulation glue can also avoid the situation that the connection is disconnected and short-circuit occurs when the tab 123 is impacted, thereby improving the safety and reliability of the electrical connection.

[0076] Specifically, the heat insulation glue can be foaming glue, which has low cost, and of course, can also be other glue with heat insulation performance.

[0077] Filling the second space 38 with the heat conduction glue can conduct the heat generated by the battery cell 10 assembly 100 out to dissipate heat, thereby avoiding heat accumulation to cause thermal runaway, improving the use safety of the battery, and prolonging the service life of the battery.

[0078] Specifically, the heat conduction glue can be silicone heat conduction glue, epoxy resin AB glue, polyurethane glue, polyurethane heat conduction and electrical conduction glue, and heat conduction silicone grease.

[0079] As an implementation manner, as shown in the box 200 between the adjacent two blocking pieces 331 is provided with at least one first groove 34 extending along the first direction and at least one end penetrating. Figure 7

[0080] By providing the groove in the box 200 between the adjacent two blocking pieces 331 and extending along the first direction and at least one end penetrating, the glue can be injected through the groove penetrating end to fill the space between the battery cell 10 assembly 100 and the box 200, thereby improving the stability of the battery structure.

[0081] In some embodiments, the groove is a groove formed by recessing the box 200 from the side of the containing space to the external environment, wherein the groove bottom and the inner wall of the box 200 can be smoothly transitioned to facilitate the glue to fill the space between the box 200 and the battery cell 10 assembly 100.

[0082] ​​The first groove 34 can be provided one or more than two, and the plurality of first grooves 34 can increase the glue injection port and improve the glue injection efficiency.

[0083] As an implementation manner, as shown in Figure 5 The first side 31 is spaced apart from the exhaust port 21 to form an exhaust passage 37, and the first side 31 is provided with an explosion-proof valve 311.

[0084] The first side 31 is spaced apart from the exhaust port 21, so that the space between the first side 31 and the exhaust port 21 constitutes the exhaust passage 37, and the high-temperature flue gas can be discharged from the exhaust passage 37. The explosion-proof valve 311 is arranged on the first side 31, which can balance the internal and external air pressure to prevent the generation of condensed water when the battery is normally working, and when thermal runaway occurs, the flue gas is gathered in the exhaust passage 37 to a certain amount, and the air pressure will blow open the explosion-proof valve 311 to exhaust, so as to avoid the explosion of the battery. At the same time, since the other three sides of the battery cell 10 assembly 100 are filled with glue, it is beneficial for the gas to be discharged from the exhaust passage 37 when thermal runaway occurs.

[0085] In some embodiments, the exhaust passage 37 can be provided in plurality, for example, each battery cell 10 assembly 100 can correspond to one exhaust passage 37. Alternatively, two, three, five or the like battery cell 10 assemblies 100 correspond to one exhaust passage 37, etc. The explosion-proof valve 311 can also be provided in plurality, and each exhaust passage 37 corresponds to one explosion-proof valve 311. The exhaust valve is arranged near the top of the box body 200, which is convenient for the discharge of high-temperature flue gas.

[0086] As an implementation manner, as shown in Figure 8 The heat insulation layer 60 and / or the buffer layer 70 is arranged between the adjacent two battery cell 10 assemblies 100.

[0087] The heat insulation layer 60 is arranged between the adjacent two battery cell 10 assemblies 100, so that when one of the battery cell 10 assemblies 100 occurs thermal runaway, the heat is not easy to conduct to the other battery cell 10 assembly 100, avoiding triggering the other battery cell 10 assembly 100 to occur thermal runaway, which is beneficial to control the heat spread. The heat insulation layer 60 can be aerogel or the like.

[0088] The buffer layer 70 is arranged between the adjacent two battery cell 10 assemblies 100, so that when one of the battery cell 10 assemblies 100 occurs thermal runaway and causes the battery cell 10 assembly 100 to swell and deform, the buffer layer 70 can buffer the extrusion effect and is not easy to extrude the other battery cell 10 assembly 100, avoiding the extrusion damage of the other battery cell 10 assembly 100, and at the same time, the buffer layer 70 can provide pre-tightening force for the battery cell 10 assembly 100, improving the performance of the battery.

[0089] Specifically, a heat insulation layer 60 is arranged between two adjacent battery cell 10 assemblies 100, or a buffer layer 70 is arranged between two adjacent battery cell 10 assemblies 100, or a heat insulation layer 60 and a buffer layer 70 are arranged between two adjacent battery cell 10 assemblies 100. When the heat insulation layer 60 and the buffer layer 70 are arranged between two adjacent battery cell 10 assemblies 100, the buffer layer 70 can be arranged on one side or both sides of the heat insulation layer 60. Preferably, each heat insulation layer 60 corresponds to two buffer layers 70, and the two buffer layers 70 are arranged on both sides of the heat insulation layer 60.

[0090] As an implementation manner, as shown in Figure 5 , the box body 200 is provided with a first heat insulation plate 312 on the side facing the exhaust port 21; the box body 200 is further provided with a second heat insulation plate 41 and a third heat insulation plate 51 along the first direction, and a plurality of battery cell 10 assemblies 100 are arranged between the second heat insulation plate 41 and the third heat insulation plate 51.

[0091] The first heat insulation plate 312 is arranged on the side of the box body 200 facing the exhaust port 21, and the second heat insulation plate 41 and the third heat insulation plate 51 are further arranged on the box body 200 along the first direction, so that the high-temperature flue gas is not easy to directly impact the box body 200, so that the box body 200 is not easy to be damaged, and the service life of the box body 200 is prolonged.

[0092] In some embodiments, the materials of the first heat insulation plate 312, the second heat insulation plate 41 and the third heat insulation plate 51 can be the same or different. In the present application, the materials of the first heat insulation plate 312, the second heat insulation plate 41 and the third heat insulation plate 51 are all mica.

[0093] As an implementation manner, as shown in Figure 4 and Figure 5 , the box body 200 includes a body 30 having a first opening, and a top plate 40 connected to the first opening, the body 30 includes a first side 31, a second side 32 and a third side 33;

[0094] As shown in Figure 4 and Figure 5 , the body 30 further has a second opening, the second opening and the first opening are respectively located at opposite ends of the body 30, and the second opening is connected with a bottom plate 50, and the first side 31, the second side 32 and the third side 33 are connected between the top plate 40 and the bottom plate 50.

[0095] The box body 200 further includes a cover body 80, as shown in Figure 5 , the cover body 80 is connected to the first opening and forms a mounting cavity 80a with the top plate 40, and a battery management system 81 is mounted in the mounting cavity 80a;

[0096] The mounting cavity 80a and the containing cavity are separated by the top plate 40, and the tab 123 is connected with the battery management system 81, so that the battery cell 10 assembly 100 is electrically connected with the battery management system 81 and is separated, the electrical devices in the battery management system 81 are protected from the influence of thermal runaway, and at the same time, the arc discharge caused by high-temperature smoke gas is prevented, and the normal battery cell 10 and other structural members are damaged.

[0097] As shown in Figure 9 and Figure 10 , the cover 80 has a sticking area 82 on the side away from the mounting cavity 80a, the sticking area 82 has a waterproof and breathable layer 83 stuck thereon, the sticking area 82 has a recess 821 recessed towards the mounting cavity 80a, a through hole 822 is arranged in the recess 821, and the sticking area 82 is further provided with a second groove 823 communicating the recess 821 with the edge of the sticking area 82.

[0098] The through hole 822 is arranged at the upper cover, and the waterproof and breathable film is stuck at the through hole 822, so that the internal and external air pressures can be balanced, and the occurrence of condensed water can be prevented. At the same time, the waterproof and breathable film can also serve as a second protection for the battery. When the thermal runaway smoke gas of the battery cell 10 assembly 100 breaks through the top plate 40, the through hole 822 at the upper cover allows the smoke gas to break through the waterproof and breathable film and the label and be exhausted at the position.

[0099] The through hole 822 is arranged in the recess 821 recessed towards the mounting cavity 80a of the sticking area 82, so that the gas entering the recess 821 from the through hole 822 can first be accumulated, and when the air pressure reaches a threshold value, the waterproof and breathable film can be broken. The second groove 823 arranged in the sticking area 82 communicates the recess 821 with the edge of the sticking area 82, which is conducive to the gas breaking the waterproof and breathable film at the second groove 823.

[0100] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the disclosure range involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features disclosed in the present application (but not limited to) having similar functions to form technical solutions.

Claims

1. A soft-pack battery cell assembly, characterized by, include: The battery cell is equipped with a venting and pressure relief structure; An insulating and heat-resistant protective component is provided, which covers the outside of the battery cell, and the tabs of the battery cell extend out of the insulating and heat-resistant protective component. The insulating and heat-resistant protective component is provided with an exhaust port corresponding to the exhaust pressure relief structure, so that when the battery cell experiences thermal runaway, the ejected material from the battery cell is discharged through the exhaust pressure relief structure and the exhaust port; wherein the tabs and the exhaust pressure relief structure are respectively located on different sides of the battery cell.

2. The soft-pack battery cell assembly of claim 1, wherein, The battery cell includes an electrode assembly and an encapsulation layer covering the outside of the electrode assembly. The encapsulation layer includes at least three sealing edges, which correspond to the edges of the electrode assembly. One of the sealing edges is a venting and pressure-relieving sealing edge. The edge of the electrode assembly corresponding to the venting and pressure-relieving sealing edge is the first corresponding edge, and the edges of the electrode assembly corresponding to the remaining sealing edges are the second corresponding edges. At least a portion of the exhaust pressure relief seal is at a greater distance from the first corresponding edge than the remaining seals are at a greater distance from the second corresponding edge, thereby forming an air-filled space between the exhaust pressure relief seal and the first corresponding edge, thus constituting the exhaust pressure relief structure.

3. The soft-pack battery cell assembly of claim 2, wherein, The venting and pressure relief sealing edge includes a first sealing edge section spaced apart from the first corresponding edge, and a second sealing edge section connected to both ends of the first sealing edge section and folded toward the first corresponding edge.

4. The soft-pack battery cell assembly of claim 1, wherein, The electrode tabs and the exhaust pressure relief structure are respectively located on opposite sides of the battery cell.

5. A battery pack, characterized by, include: The housing has a receiving cavity; The pouch cell assembly according to any one of claims 1-4, wherein the plurality of pouch cell assemblies are stacked sequentially in the receiving cavity along a first direction and form an exhaust channel with the housing, and the exhaust port is disposed toward the exhaust channel.

6. The battery pack of claim 5, wherein, The housing includes a first side and a second side arranged opposite to each other, and two third sides arranged opposite to each other and connecting the first side and the second side. The exhaust port faces the first side and the electrode tab faces the second side. Each of the third sides corresponds to at least two spaced-apart blocking members, which extend along a first direction to divide the space between the plurality of pouch cell assemblies and the housing into a first space including the tabs, a second space including the exhaust port, and a third space located between the first space and the second space. The first space is filled with heat-insulating adhesive; The second space is filled with thermally conductive adhesive.

7. The battery pack of claim 6, wherein, The housing between two adjacent blocking members is provided with at least one first groove, the first groove extending along the first direction and penetrating at least one end.

8. The battery pack of claim 5, wherein, A heat insulation layer is provided between two adjacent pouch cell assemblies; And / or, a buffer layer is provided between two adjacent pouch cell assemblies.

9. The battery pack of claim 5, wherein, The box body is provided with a first heat insulation plate on the side facing the exhaust port; The housing is further provided with a second heat insulation plate and a third heat insulation plate at intervals along the first direction, and a plurality of the soft-pack battery cell assemblies are disposed between the second heat insulation plate and the third heat insulation plate.

10. The battery pack of claim 6, wherein, The enclosure includes a body having a first opening and a top plate connected to the first opening. The body includes a first side, a second side, and a third side. The box further comprises a cover connected to the first opening and forming a mounting cavity with the top plate, and a battery management system is mounted in the mounting cavity; The cover has a sticking area on the side away from the mounting cavity, and a waterproof and breathable layer is stuck on the sticking area; the sticking area has a pit recessed towards the mounting cavity, a through hole is arranged in the pit, and a second groove is further arranged on the edge of the sticking area and communicates the pit with the sticking area.

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