Battery pack and energy storage device

Abstract

The utility model belongs to the field of batteries, and particularly relates to a battery pack and an energy storage device. The battery pack comprises an explosion venting collecting pipe, n single batteries and a sealing component; the explosion venting collecting pipe comprises a collecting main pipe and n collecting branch pipes; the single battery comprises an upper cover assembly; the upper cover assembly comprises an upper cover body, an explosion venting opening formed in the upper cover body and an explosion venting branch pipe fixed to the explosion venting opening. An explosion venting film is arranged on at least one of the explosion venting opening and the explosion venting branch pipe; each confluence branch pipe of the explosion venting confluence pipe is in sealed connection with the explosion venting branch pipe of the corresponding single battery through a sealing component, so that thermal runaway smoke of the single battery is ensured to break through the explosion venting film and then is discharged through the explosion venting confluence pipe, and the risk that the thermal runaway smoke threatens the personal safety of personnel around the battery pack is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, in particular to a battery pack and an energy storage device. Background Art

[0002] Currently, common battery packs are formed by connecting multiple single cells in series, in parallel, or in series and parallel.

[0003] Each single cell in the battery pack may experience thermal runaway due to mechanical, electrical, thermal abuse and its own defects. Once thermal runaway occurs and is not effectively handled, it will cause a safety accident and pose a threat to the personal safety of people around the battery pack. Utility Model Content

[0004] The utility model aims to provide a battery pack and an energy storage device to avoid safety problems caused by thermal runaway.

[0005] The technical solution of the utility model is to provide a battery pack, which is special in that it includes an explosion relief manifold, n single batteries and n sealing components, wherein n is an integer greater than 1;

[0006] The explosion relief manifold includes a manifold main manifold and n manifold branches, wherein the n manifold branches correspond to the n single cells one by one, are fixed on the manifold main manifold and are connected to the manifold main manifold;

[0007] The single cell battery comprises an upper cover assembly; the upper cover assembly comprises an upper cover body, an explosion venting opening arranged on the upper cover body, and an explosion venting branch pipe fixed at the explosion venting opening; the explosion venting branch pipe extends in a direction away from the inner cavity of the single cell battery; an explosion venting film is arranged on at least one of the explosion venting opening and the explosion venting branch pipe;

[0008] Each branch pipe of the explosion-proof manifold is sealed and connected to the explosion-proof branch pipe of the corresponding single cell through a sealing component to ensure that the smoke from thermal runaway of the single cell breaks through the explosion-proof membrane and is discharged through the explosion-proof manifold.

[0009] The utility model is based on an explosion-proof manifold that connects the explosion-proof ports of all the single cells in the battery pack. When any single cell constituting the battery pack experiences thermal runaway, the thermal runaway smoke breaks through the explosion-proof membrane and is discharged from the explosion-proof manifold, thereby avoiding the risk of the thermal runaway smoke posing a threat to the personal safety of people around the battery pack. In order to ensure the sealing of the connection between the explosion-proof manifold and the explosion-proof ports of the single cells, the utility model redesigns the upper cover assembly of the existing commercially available square lithium-ion battery, and adds an explosion-proof branch pipe at the location of the explosion-proof port of the existing upper cover assembly; the explosion-proof manifold is designed to have a main manifold and a plurality of branch manifolds, and a sealing component is introduced at the same time, and each branch manifold of the explosion-proof manifold is sealed and connected to the explosion-proof branch pipe of the corresponding single cell through a sealing component. The sealing component can ensure the sealing of the connection between the explosion-proof branch pipe and the explosion-proof manifold.

[0010] Furthermore, the sealing component is a butt joint pipe section; the explosion venting branch pipe and the corresponding confluence branch pipe have the same outer diameter; the ends of the explosion venting branch pipe and the corresponding confluence branch pipe abut against each other; one end of the butt joint pipe section is sealed and sleeved outside the explosion venting branch pipe, and the other end is sealed and sleeved outside the confluence branch pipe. Based on the pipe clamp tool, the butt joint pipe section can be plastically deformed, thereby ensuring the sealing of the abutment portion between the explosion venting branch pipe and the corresponding confluence branch pipe.

[0011] Furthermore, a first annular groove is provided on the outer wall of the explosion relief branch pipe along the circumference thereof; a second annular groove is provided on the outer wall of the converging branch pipe along the circumference thereof; a first annular protrusion and a second annular protrusion are provided on the inner walls of both ends of the butt joint pipe section along the circumference thereof; the first annular protrusion is embedded in the first annular groove, and the second annular protrusion is embedded in the second annular groove. Based on the embedded structure of the protrusion and the groove, the stability of the butt joint pipe section can be improved.

[0012] Furthermore, the sealing component can also adopt another structure, which is a sealing rubber layer; the explosion relief branch pipe is sleeved in the corresponding branch pipe; the sealing rubber layer is coated on the outer wall of the branch pipe and the area corresponding to the sleeved part along the circumference of the branch pipe.

[0013] Furthermore, the battery pack may further include n sealing rings; the n sealing rings correspond to the n single cells one by one, are sleeved outside the corresponding busbars, and have an annular gap between the busbars; the sealing rubber layer is located in the annular gap.

[0014] The utility model also provides an energy storage device, which is special in that it comprises a pack box, m single cells and m sealing components located in the pack box, wherein m is an integer greater than 1;

[0015] The upper cover of the pack box is composed of an upper cover plate and a lower cover plate, and there is a gap between the upper cover plate and the lower cover plate, and the gap is used as an explosion relief confluence channel; m confluence branches are arranged on the lower cover plate and are connected to the explosion relief confluence channel; the m confluence branches correspond to the m single cells one by one;

[0016] The single cell battery comprises an upper cover assembly; the upper cover assembly comprises an upper cover body, an explosion venting opening arranged on the upper cover body, and an explosion venting branch pipe fixed at the explosion venting opening; the explosion venting branch pipe extends in a direction away from the inner cavity of the single cell battery; an explosion venting film is arranged on at least one of the explosion venting opening and the explosion venting branch pipe;

[0017] Each confluence branch pipe of the pack box is sealed and connected to the explosion relief branch pipe of the corresponding single cell through a sealing component to ensure that the smoke from thermal runaway of the single cell breaks through the explosion relief membrane and is discharged through the explosion relief confluence channel.

[0018] Different from the above scheme, this scheme uses the gap between the upper cover plate and the lower cover plate of the pack box as an explosion-proof confluence channel, and the explosion-proof confluence channel can be equivalent to the confluence main pipe in the above scheme.

[0019] Further, the sealing member is a butt-jointed pipe section;

[0020] The explosion venting branch pipe has the same outer diameter as the corresponding converging branch pipe; the ends of the explosion venting branch pipe and the corresponding converging branch pipe abut against each other;

[0021] One end of the butt-joint pipe section is sealed and sleeved outside the explosion-relief branch pipe, and the other end is sealed and sleeved outside the converging branch pipe.

[0022] Furthermore, a first annular groove is provided on the outer wall of the explosion relief branch pipe along the circumference thereof; a second annular groove is provided on the outer wall of the converging branch pipe along the circumference thereof; and a first annular protrusion and a second annular protrusion are provided on the inner walls of both ends of the butt joint pipe section along the circumference thereof respectively;

[0023] The first annular protrusion is embedded in the first annular groove, and the second annular protrusion is embedded in the second annular groove.

[0024] Furthermore, the explosion-relief branch pipe and the butt-joint pipe section are both made of aluminum.

[0025] Furthermore, the sealing component can also be a sealant layer; the explosion relief branch pipe is sleeved in the corresponding branch pipe; the sealant layer is coated on the outer wall of the branch pipe and the area corresponding to the sleeved position along the circumference of the branch pipe.

[0026] Furthermore, the battery pack further comprises n sealing rings; the n sealing rings correspond to the n single cells one by one, are sleeved outside the corresponding busbars, and have an annular gap between the busbars; the sealing rubber layer is located in the annular gap.

[0027] The beneficial effects of the utility model are:

[0028] The utility model is based on an explosion-proof manifold that connects the explosion-proof ports of all the single cells in the battery pack. When any single cell constituting the battery pack experiences thermal runaway, the thermal runaway smoke breaks through the explosion-proof membrane and is discharged from the explosion-proof manifold, thereby avoiding the risk of the thermal runaway smoke posing a threat to the personal safety of people around the battery pack. In order to ensure the sealing of the connection between the explosion-proof manifold and the explosion-proof ports of the single cells, the utility model redesigns the upper cover assembly of the existing commercially available square lithium-ion battery, and adds an explosion-proof branch pipe at the location of the explosion-proof port of the existing upper cover assembly; the explosion-proof manifold is designed to have a main manifold and a plurality of branch manifolds, and a sealing component is introduced at the same time, and each branch manifold of the explosion-proof manifold is sealed and connected to the explosion-proof branch pipe of the corresponding single cell through a sealing component. The sealing component can ensure the sealing of the connection between the explosion-proof branch pipe and the explosion-proof manifold. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of the upper cover assembly in Example 1;

[0030] Figure 2 is a schematic diagram of the structure of a single cell in Example 1;

[0031] Figure 3 is a schematic diagram of the structure of the battery pack in Example 1;

[0032] Figure 4 This is a schematic diagram of the structure of the explosion-relief manifold in Example 1;

[0033] Figure 5 This is a schematic diagram of a partial explosion of a battery pack in Example 1;

[0034] Figure 6 is a partial cross-sectional view of the battery pack in Example 1;

[0035] Figure 7 is a schematic structural diagram of the sealing component in Example 1;

[0036] Figure 8 is a cross-sectional view of the sealing member in Example 1;

[0037] Fig. 9 is a partial cross-sectional view of the battery pack in Example 3;

[0038] Fig.10 It is a partial cross-sectional view of the battery pack in Example 4 (no sealing rubber layer is provided in the annular gap);

[0039] Fig.11 It is a partial cross-sectional view of the battery pack in Example 4 (a sealing rubber layer is provided in the annular gap);

[0040] Fig.12 This is a schematic diagram of a partial explosion of a battery pack in Example 4;

[0041] Fig.13 is a schematic diagram of the structure of the battery pack in Example 4;

[0042] The reference numerals in the figures are

[0043] 1. Upper cover assembly; 2. Upper cover body; 3. Pole; 31. First end face; 32. Side wall; 33. Through groove; 4. Explosion-venting membrane; 5. Explosion-venting branch pipe; 6. Single battery; 61. Cylinder; 7. Battery pack; 8. Explosion-venting manifold; 81. Manifold main pipe; 82. Manifold branch pipe; 9. Sealing member; 91. First annular protrusion; 92. Second annular protrusion; 93. Sealing glue layer; 94. Sealing glue ring; 95. Gap. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary persons in the field without creative work should fall within the scope of protection of the utility model.

[0045] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0046] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "top, bottom" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first, second, third, fourth, etc." are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0047] The utility model discloses a battery pack, comprising an explosion-relief collector and n single batteries; wherein n is an integer greater than 1 and can be selected according to specific needs.

[0048] The utility model redesigns the upper cover assembly of the existing commercially available square lithium-ion battery. The upper cover assembly comprises an upper cover body, two poles, an explosion vent arranged on the upper cover body, and an explosion vent branch pipe arranged on the upper cover body corresponding to the position of the explosion vent; one end of the explosion vent branch pipe is connected to the upper cover body area around the explosion vent, and the other end is used to connect with the explosion vent manifold; wherein, at least one of the explosion vent and the explosion vent branch pipe is provided with an explosion vent membrane.

[0049] The explosion venting manifold is used to connect with the explosion venting branch pipes of multiple single cells. When any single cell has thermal runaway, the thermal runaway smoke breaks through the explosion venting membrane and is discharged from the explosion venting manifold, thus avoiding safety accidents caused by thermal runaway smoke.

[0050] It should be noted that:

[0051] 1. The explosion venting branch pipe is generally a thin-walled tubular structure, which can be integrally formed with the upper cover body by one-piece processing, or fixed to the upper cover body by riveting, welding or injection molding. The horizontal cross section of the explosion venting branch pipe (the cross section along its radial direction) can be a rectangular ring or a circular ring. In order to better adapt to the shape of the explosion venting port, the horizontal cross section of the explosion venting branch pipe is usually a circular ring.

[0052] 2. After the explosion-relief manifold is connected to the explosion-relief branch pipes of each single cell, the sealing of the connection part should be ensured. How to ensure the sealing of this part is the main technical problem to be solved by the utility model.

[0053] In order to solve this technical problem, the utility model proposes an explosion-proof collector pipe including a collector pipe and n collector branches; the n collector branches correspond to n single cells one by one, are fixed on the collector pipe and are connected with the collector pipe. At the same time, a sealing component is introduced to seal and connect each collector branch pipe of the explosion-proof collector pipe with the corresponding explosion-proof branch pipe of the single cell through a sealing component. The sealing component can ensure the sealing of the connection between the explosion-proof branch pipe and the explosion-proof collector pipe.

[0054] The following is a detailed description of sealing components of different structures and their corresponding battery packs and energy storage devices in conjunction with specific embodiments and drawings of the specification.

[0055] Example 1

[0056] like Figure 1 As shown, it is a schematic diagram of the structure of the upper cover assembly 1 of this embodiment, including an upper cover body 2, on which two poles 3 are arranged, which serve as positive and negative poles of a single battery 6 respectively, and an explosion vent is arranged on the upper cover body 2 between the positive and negative poles, and an explosion vent film 4 is arranged on the explosion vent along its radial direction, and an explosion vent branch pipe 5 is fixed to the upper cover body 2 area around the explosion vent. In this embodiment, the explosion vent branch pipe 5 is a straight pipe section, which is integrally formed with the upper cover body 2 by a stamping process. The material can be the same aluminum material as the upper cover body 2.

[0057] In some other embodiments, the explosion relief branch pipe 5 and the upper cover body 2 are separate parts. Generally, the explosion relief branch pipe 5 can be fixed on the upper cover body 2 by welding, riveting or injection molding.

[0058] In some other embodiments, the explosion relief branch pipe 5 made of materials such as PP or PE may be fixed to the upper cover body 2 by hot melting.

[0059] It should be noted that the positive and negative poles 3 are insulated from the upper cover body 2 , and the insulation can be maintained by pouring insulating glue or providing an insulating rubber sleeve.

[0060] This embodiment also optimizes the pole 3 in the upper cover assembly 1. The specific structure is as follows: Figure 1and Figure 2 shown.

[0061] like Figure 1 As shown, the pole 3 of this embodiment is a columnar body, including a first end face 31, a second end face and a side wall 32 (the first end face 31 and the second end face are parallel to each other), and at least one through groove 33 is provided on the first end face 31, or at least one through groove 33 is provided on the side wall 32 (see Figure 2 ) or through holes for installing heat exchange tubes, that is, the opening of the through groove 33 is located on the first end surface 31 or the side wall 32, and the opening of the through hole is located on the side wall 32. The first end surface 31 is provided with an electrical connection area for connecting to an external electrical connector, and the second end surface is used for electrically connecting to the electrode assembly in the battery housing. Compared with Figure 1 The structure shown, Figure 2 In the structure shown, a through slot 33 is provided on the side wall 32 (the opening of the through slot 33 is located on the side wall 32). Compared with providing the through slot 33 on the first end face 31, the contact area between the heat exchange tube in the through slot 33 and the inner wall of the through slot 33 is larger, and the heat exchange efficiency is higher. In addition, when the through slot 33 is located on the side wall 32, the entire area of ​​the first end face 31 can be used as an electrical connection area. Two through slots 33 can also be provided on the side wall 32 of the pole 3 at the same time to increase the number of heat exchange tubes placed and further improve the heat exchange efficiency. Figure 1 The structure shown, compared to Figure 2 , the heat exchange tube is easier to install.

[0062] The cross section of the through groove 33 is C-shaped or U-shaped. The opening width of the through groove 33 with a C-shaped cross section is smaller than the widest part of the through groove 33. Such a design is conducive to the interference fit of the heat exchange tube in the through groove 33. The arc formed at both ends of the C-shaped through groove 33 has natural tension, which is conducive to the heat exchange tube being tightly fit in the through groove 33.

[0063] The horizontal cross-section of the pole 3 can be circular, rectangular or racetrack-shaped. The pole 3 of different shapes can be selected according to different battery models. Other different shapes are also possible, which are not listed in this embodiment.

[0064] In this embodiment, the second end face of the pole 3 is close to the electrode assembly, so the second end face is closer to the electrode assembly inside the battery, and the heat exchange tube should be arranged as close to the second end face as possible. Such an arrangement can make the heat exchange tube as close to the inside of the battery as possible for heat transfer.

[0065] By providing a through groove 33 or a through hole on the pole 3 and placing a heat exchange tube in the through groove 33 or the through hole, the temperature of the pole 3 can be effectively controlled. Further, an electrical connection area is provided on the first end face 31 of the pole 3, so that an electrical connector can be installed through the electrical connection area to realize parallel connection of multiple square batteries. The structure is simple, practical, and easy to operate. It can balance the heat of the battery pack 7, has good heat dissipation effect, and is low in cost.

[0066] like Figure 2 , which is a schematic diagram of the structure of a single cell 6 of this embodiment; it includes a barrel 61, an upper cover assembly 1, a lower cover assembly and an electrode assembly; wherein the upper cover assembly 1 is the above-mentioned upper cover assembly.

[0067] When processing the single battery 6, the electrode assembly is installed into the barrel body formed by the cylinder 61 and the lower cover assembly, and then the upper cover assembly 1 is fixed to the open end of the barrel body.

[0068] like Figure 3 As shown, it is a schematic diagram of the structure of the battery pack 7 of this embodiment, including an explosion relief manifold 8 and 13 single cells 6, wherein the single cells 6 are Figure 2 The single battery 6 is shown; in other embodiments, the number of the single batteries 6 can be adjusted according to actual needs.

[0069] like Figure 4 As shown, the explosion relief manifold 8 in this embodiment includes a main manifold 81 and 13 branch manifolds 82, and the 13 branch manifolds 82 are all fixed on the main manifold 81 and are connected to the main manifold 81. The branch manifolds 82 correspond to the single cells 6 one by one, so in other embodiments, the number of branch manifolds 82 can be adjusted according to the number of single cells 6.

[0070] The main confluence pipe 81 of the utility model is a tubular component, and its horizontal cross section (cross section along its radial direction) can be a rectangular ring or a circular ring; the branch confluence pipe 82 is also a tubular component, and its horizontal cross section (cross section along its radial direction) can also be a rectangular ring or a circular ring. It should be noted that its cross-sectional shape should be consistent with the cross-sectional shape of the explosion relief branch pipe 5 of the corresponding single battery 6. The branch confluence pipe 82 can be integrally formed with the main confluence pipe 81 by an integrated processing method, and can also be fixed to the main confluence pipe 81 by riveting, welding or screwing.

[0071] The 13 single cells 6 are arranged in the same direction. For the convenience of description, the arrangement direction of the 13 single cells 6 can be defined as the x direction, and the height direction of each single cell 6 can be defined as the z direction.

[0072] from Figure 5 and Figure 6 It can be seen that the main confluence pipe 81 of the utility model is located above each single cell 6, and each confluence branch pipe 82 extends along the z direction and is sealed and connected to the explosion-proof branch pipe 5 of the corresponding single cell 6 through a sealing component 9 to ensure that the smoke from the thermal runaway of the single cell 6 breaks through the explosion-proof membrane 4 and is discharged through the explosion-proof confluence pipe 8.

[0073] Combination Figure 7 and Figure 8It can be seen that the sealing component 9 in this embodiment is a butt joint pipe section, which is a thin-walled pipe section with a certain plastic deformation; the explosion-relief branch pipe 5 is equal to the outer diameter of the corresponding confluence branch pipe 82, and the inner diameter of the butt joint pipe section is slightly larger than the outer diameter of the confluence branch pipe 82 and the corresponding explosion-relief branch pipe 5; the ends of the explosion-relief branch pipe 5 and the corresponding confluence branch pipe 82 are abutted against each other, one end of the butt joint pipe section is sealedly sleeved on the outside of the explosion-relief branch pipe 5, and the other end is sealedly sleeved on the outside of the confluence branch pipe 82.

[0074] In order to further improve the sealing performance and at the same time improve the stability of the butt-jointed pipe section, such as Figure 6 , Figure 7 and Figure 8 As shown, in this embodiment, a first annular groove is provided on the outer wall of the explosion relief branch pipe 5 along the circumference thereof; a second annular groove is provided on the outer wall of the converging branch pipe 82 along the circumference thereof; a first annular protrusion 91 and a second annular protrusion 92 are respectively provided on the inner walls of both ends of the butt joint pipe section along the circumference thereof; the first annular protrusion 91 is embedded in the first annular groove, and the second annular protrusion 92 is embedded in the second annular groove. In addition, in order to facilitate the first annular protrusion 91 and the second annular protrusion 92 of the butt joint pipe section to be inserted into the corresponding annular groove, in this embodiment, a chamfer is provided on the first annular protrusion 91 and the second annular protrusion 92, and one of the side walls 32 of the corresponding annular groove is set as an inclined surface matching the chamfer.

[0075] During the specific assembly, first, the first annular protrusion 91 of each docking pipe section is embedded in the first annular groove of the explosion-proof branch pipe 5 of the corresponding single battery 6, and then, each branch pipe 82 of the explosion-proof bus 8 is inserted from the upper end opening of the docking pipe section (during the insertion process, the docking pipe section is slightly deformed), and the end of the branch pipe 82 is pressed against the end of the corresponding explosion-proof branch pipe 5; finally, the docking pipe section is squeezed using a pipe clamp device, so that the first annular protrusion 91 and the second annular protrusion 92 of the docking pipe section are completely embedded in the corresponding first annular groove and the second annular groove.

[0076] In this embodiment, the explosion relief manifold 8, the explosion relief branch pipe 5 and the butt-joint pipe section are all made of aluminum, which has a wide range of sources, is relatively soft, and is easily deformed, which is more conducive to the implementation of this solution.

[0077] In some other embodiments, the sealing member 9 can also be two flanges, which are respectively fixed to the converging branch pipe 82 and one end of the corresponding explosion relief branch pipe 5, and then a flange gasket is added between the two flanges, and finally the two flanges are tightened with bolts to make them tightly combined. However, compared with this embodiment, its structure is more complicated.

[0078] Example 2

[0079] Different from the first embodiment, the explosion venting membrane 4 of the present embodiment is arranged on the explosion venting branch pipe 5; the explosion venting membrane 4 can be arranged at the end of the explosion venting branch pipe 5 away from the upper cover body 2. When the inner cavity of the single battery 6 produces gas, the inner cavity of the explosion venting branch pipe 5 can also be used as a gas receiving cavity, which can alleviate the problem of battery shell swelling caused by gas production.

[0080] In order to facilitate the fixation of the explosion-venting membrane 4 , an annular boss may be provided on the inner wall of the explosion-venting branch pipe 5 along its circumference, and the explosion-venting membrane 4 is fixed to the explosion-venting branch pipe 5 via the annular boss.

[0081] Example 3

[0082] Different from the above-mentioned embodiment, this embodiment adopts a sealing rubber layer as a sealing member.

[0083] from Fig. 9 It can be seen that the main confluence pipe 81 of the utility model is located above the upper cover assembly 1 of each single cell 6, and each branch confluence pipe 82 extends along the z direction and is sleeved on the outside of the corresponding single cell explosion-proof branch pipe 5, and a sealant layer 93 is coated circumferentially along the confluence branch pipe 82 on the outer wall of the confluence branch pipe 82 and in the corresponding area of ​​the sleeved portion of the two, so as to ensure the sealing of the sleeved portion, so that the thermal runaway smoke of the single cell 6 breaks through the explosion-proof membrane 4 and is discharged through the explosion-proof confluence pipe 8.

[0084] In some other embodiments, each busbar 82 can be sleeved in the corresponding single cell explosion relief branch pipe 5, and a sealant layer 93 is coated on the outer wall of the explosion relief branch pipe and the corresponding area of ​​the sleeved portion of the two.

[0085] In some other embodiments, in order to facilitate the connection between the explosion-venting branch pipe and the corresponding converging branch pipe, the structure of the explosion-venting branch pipe of the straight pipe section may be optimized.

[0086] The explosion relief branch pipe can be designed as a variable diameter pipe section, one section of which is a straight pipe section and the other section is a tapered pipe section. The large end of the tapered pipe section is connected to the straight pipe section, and the small end of the tapered pipe section is used to connect to the explosion relief manifold. The tapered pipe section is inserted into the corresponding manifold to achieve the connection between the explosion relief branch pipe and the manifold.

[0087] During the specific assembly, first, connect each explosion-relief branch pipe with the corresponding converging branch pipe, and then apply a sealing adhesive layer on the connection part.

[0088] The sealant used in this embodiment is generally a battery potting glue commonly used in batteries, such as a silicone thermal conductive potting glue, which has good sealing, insulation, vibration resistance, heat dissipation and waterproof functions.

[0089] Example 4

[0090] In order to form a thicker and more uniform sealant layer at the connection part, this embodiment adopts a glue pouring method to form the sealant layer; therefore, Figures 10 to 13 As shown, based on the embodiment 3, this embodiment further includes 13 sealing rings 94, and the 13 sealing rings 94 correspond to the 13 branch pipes 82 one by one, and are sleeved outside the corresponding branch pipes 82, and there is an annular gap 95 between the branch pipes (see Fig.10 ); the sealing layer 93 is located in the annular gap 95 (see Fig.11 ).

[0091] During the specific assembly, first, each sealing ring 94 is sleeved outside the corresponding explosion relief branch pipe 5, then the explosion relief branch pipe 5 is sleeved with the corresponding converging branch pipe 82 (the converging branch pipe 82 is located between the explosion relief branch pipe 5 and the sealing ring 94), and finally, the sealant is injected into the gap between the converging branch pipe 82 and the sealing ring 94, and a thicker sealing layer 93 can be formed after curing. The thickness of the sealing layer 93 can be controlled by controlling the inner diameter of the sealing ring 94 (that is, controlling the outer diameter of the annular gap).

[0092] Example 5

[0093] The present embodiment is an energy storage device, comprising a pack box and a plurality of battery modules connected in series in the pack box, wherein each battery module is composed of a plurality of single cells 6 in the first embodiment connected in parallel.

[0094] In this embodiment, the upper cover of the pack box is designed to be a double-layer structure, that is, the upper cover of the pack box is composed of two layers of cover plates, and the two layers of cover plates can be defined as an upper cover plate and a lower cover plate, respectively. There is a gap between the upper cover plate and the lower cover plate, which serves as an explosion-proof convergence channel (the explosion-proof convergence channel can be equated with the convergence main pipe 81 in the explosion-proof convergence pipe 8 in the above embodiment), and the two layers of cover plates are closed on all sides, and a smoke exhaust port is reserved at the connection position around the upper cover plate or the two layers of cover plates; a convergence branch pipe 82 is provided on the lower cover plate at the position of the explosion-proof branch pipe 5 corresponding to each single cell 6; each convergence branch pipe 82 is connected to the corresponding explosion-proof branch pipe 5 through a sealing member 9, and the specific sealing member can adopt the butt-joint pipe section in embodiment 1, or can adopt the sealing adhesive layer in embodiments 3 and 4. The specific connection method is the same as the above corresponding embodiments, and will not be repeated here. When any single cell 6 has thermal runaway, the thermal runaway smoke breaks through the explosion-proof membrane 4, enters the explosion-proof convergence channel through the explosion-proof branch pipe 5, and is discharged from the smoke exhaust port.

Claims

1. A battery pack, characterized in that: The device comprises an explosion relief manifold, n single cells and n sealing components, wherein n is an integer greater than 1; The explosion relief manifold includes a manifold main manifold and n manifold branches, wherein the n manifold branches correspond to the n single cells one by one, are fixed on the manifold main manifold and are connected to the manifold main manifold; The single cell battery comprises an upper cover assembly; the upper cover assembly comprises an upper cover body, an explosion venting opening arranged on the upper cover body, and an explosion venting branch pipe fixed at the explosion venting opening; the explosion venting branch pipe extends in a direction away from the inner cavity of the single cell battery; an explosion venting film is arranged on at least one of the explosion venting opening and the explosion venting branch pipe; Each branch pipe of the explosion-proof manifold is sealed and connected to the explosion-proof branch pipe of the corresponding single cell through a sealing component to ensure that the smoke from thermal runaway of the single cell breaks through the explosion-proof membrane and is discharged through the explosion-proof manifold.

2. The battery pack according to claim 1, characterized in that: The sealing member is a butt-jointed pipe section; The explosion venting branch pipe has the same outer diameter as the corresponding converging branch pipe; the ends of the explosion venting branch pipe and the corresponding converging branch pipe abut against each other; One end of the butt-joint pipe section is sealed and sleeved outside the explosion-relief branch pipe, and the other end is sealed and sleeved outside the converging branch pipe.

3. The battery pack according to claim 2, characterized in that: A first annular groove is provided on the outer wall of the explosion relief branch pipe along the circumference thereof; a second annular groove is provided on the outer wall of the converging branch pipe along the circumference thereof; a first annular protrusion and a second annular protrusion are provided on the inner walls of both ends of the butt joint pipe section along the circumference thereof; The first annular protrusion is embedded in the first annular groove, and the second annular protrusion is embedded in the second annular groove.

4. The battery pack according to claim 1, characterized in that: The sealing component is a sealing rubber layer; the explosion relief branch pipe is sleeved in the corresponding converging branch pipe; The sealant layer is coated on the area corresponding to the sleeve connection position on the outer wall of the busbar pipe along the circumference of the busbar pipe.

5. The battery pack according to claim 4, characterized in that: It also includes n sealing rings; the n sealing rings correspond to the n single cells one by one, are sleeved outside the corresponding busbars, and have an annular gap between the busbars; the sealing rubber layer is located in the annular gap.

6. An energy storage device, characterized in that: A pack box, m single cells and m sealing members are located in the pack box, wherein m is an integer greater than 1; The upper cover of the pack box is composed of an upper cover plate and a lower cover plate, and there is a gap between the upper cover plate and the lower cover plate, and the gap is used as an explosion relief confluence channel; m confluence branches are arranged on the lower cover plate and are connected to the explosion relief confluence channel; the m confluence branches correspond to the m single cells one by one; The single cell battery comprises an upper cover assembly; the upper cover assembly comprises an upper cover body, an explosion venting opening arranged on the upper cover body, and an explosion venting branch pipe fixed at the explosion venting opening; the explosion venting branch pipe extends in a direction away from the inner cavity of the single cell battery; an explosion venting film is arranged on at least one of the explosion venting opening and the explosion venting branch pipe; Each confluence branch pipe of the pack box is sealed and connected to the explosion relief branch pipe of the corresponding single cell through a sealing component to ensure that the smoke from thermal runaway of the single cell breaks through the explosion relief membrane and is discharged through the explosion relief confluence channel.

7. The energy storage device according to claim 6, characterized in that: The sealing member is a butt-jointed pipe section; The explosion venting branch pipe has the same outer diameter as the corresponding converging branch pipe; the ends of the explosion venting branch pipe and the corresponding converging branch pipe abut against each other; One end of the butt-joint pipe section is sealed and sleeved outside the explosion-relief branch pipe, and the other end is sealed and sleeved outside the converging branch pipe.

8. The energy storage device according to claim 7, characterized in that: A first annular groove is provided on the outer wall of the explosion relief branch pipe along the circumference thereof; a second annular groove is provided on the outer wall of the converging branch pipe along the circumference thereof; a first annular protrusion and a second annular protrusion are provided on the inner walls of both ends of the butt joint pipe section along the circumference thereof; The first annular protrusion is embedded in the first annular groove, and the second annular protrusion is embedded in the second annular groove.

9. The energy storage device according to claim 6, characterized in that: The sealing component is a sealing rubber layer; the explosion relief branch pipe is sleeved in the corresponding converging branch pipe; The sealant layer is coated on the area corresponding to the sleeve connection position on the outer wall of the busbar pipe along the circumference of the busbar pipe.

10. The energy storage device according to claim 9, characterized in that: It also includes n sealing rings; the n sealing rings correspond to the n single cells one by one, are sleeved outside the corresponding busbars, and have an annular gap between the busbars; the sealing rubber layer is located in the annular gap.

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