Exhaust structure and battery pack

Abstract

The embodiment of the utility model discloses an exhaust structure and a battery pack, and relates to the technical field of new energy batteries. The exhaust structure comprises a pipe body, an air suction assembly and a first one-way valve, the pipe body is provided with a flow channel, an inlet and an outlet, the inlet and the outlet are communicated with the flow channel, the inlet is communicated with an exhaust hole of the battery pack, the air suction assembly is installed in the flow channel and used for sucking air in the battery pack, and the first one-way valve is installed in the flow channel and used for opening or closing the exhaust hole. When a battery cell in the battery pack is subjected to thermal runaway, the internal pressure of the battery pack is increased, eruption substances in the battery pack pass through an exhaust hole, an inlet, a first one-way valve and a flow channel and then flow out of an outlet, and the air suction assembly can accelerate discharge of the eruption substances in the battery pack; the first one-way valve can block the exhaust hole, so that external substances are prevented from flowing into the battery pack.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy battery technical field especially, relates to a kind of exhaust structure and battery pack. BACKGROUND

[0002] Current new energy battery pack is arranged and combined by multiple cell units, and is installed into battery pack. Due to the requirement of battery working environment, the battery pack needs to seal the internal cell. For a single cell, the cell shell also needs to seal and protect the internal bare cell. When the battery works, due to various unpredictable working conditions or quality defects, the cell in the battery pack may be out of control, the shell may be broken (or the explosion-proof valve is opened), and the internal substances and reaction substances of the cell, such as gas, dust and heat, may be sprayed out of the battery pack through the exhaust hole. The existing exhaust hole is generally provided with an explosion-proof valve, which cannot be closed after being opened, so that external substances may enter the battery pack through the exhaust hole. SUMMARY

[0003] Therefore, it is necessary to provide an exhaust structure and a battery pack to solve the technical problem that when the battery works, due to various unpredictable working conditions or quality defects, the cell in the battery pack may be out of control, the shell may be broken (or the explosion-proof valve is opened), and the internal substances and reaction substances of the cell, such as gas, dust and heat, may be sprayed out of the battery pack through the exhaust hole. The existing exhaust hole is generally provided with an explosion-proof valve, which cannot be closed after being opened, so that external substances may enter the battery pack through the exhaust hole.

[0004] In a first aspect, the utility model provides an exhaust structure, which comprises a pipe body, an air suction assembly and a first one-way valve. The pipe body has a flow channel, an inlet and an outlet connected to the flow channel. The inlet is connected to the exhaust hole of the battery pack. The air suction assembly is installed in the flow channel and is used to suck air from the inside of the battery pack. The first one-way valve is installed in the flow channel and is used to open or block the exhaust hole.

[0005] In one embodiment, the first one-way valve comprises a valve body, an elastic sheet and a support. The support is connected to the wall of the flow channel. The valve body is connected to the elastic sheet. The elastic sheet is connected to the support. The valve body can open or block the exhaust hole.

[0006] In one embodiment, the exhaust structure further comprises a sealing ring. The sealing ring is installed on the support and is used to seal the support and the valve body.

[0007] In one embodiment, the exhaust structure further comprises a vacuumizing member, the pipe body is further provided with an interface communicating with the flow channel, the interface is located between the first one-way valve and the exhaust hole, and the vacuumizing member communicates with the interface and is used for vacuumizing to make the valve body close the exhaust hole.

[0008] In one embodiment, the air suction assembly can be a fan, which is rotatably connected in the flow channel and used for air suction in the flow channel.

[0009] In one embodiment, the air suction assembly can also be a pump body, which is installed in the flow channel and used for air suction in the flow channel.

[0010] In the second aspect, the utility model further provides a battery pack, the battery pack includes the exhaust structure of any one embodiment.

[0011] In one embodiment, the battery pack comprises a shell, a cell assembly, a current collection channel, a sealing member and a plurality of second one-way valves, the shell has a containing space, the cell assembly and the current collection channel are both installed in the containing space, the cell assembly comprises a plurality of cells arranged in sequence, each cell is provided with an explosion-proof valve, the current collection channel is provided with a through hole corresponding to each cell, each through hole is provided with the second one-way valve, the second one-way valve can be opened to the current collection channel side, each through hole is communicated with the explosion-proof valve through the sealing member, and the current collection channel is communicated with the exhaust hole.

[0012] In one embodiment, a plurality of the cells are arranged in sequence on one side of the current collection channel to form a cell row, the sealing member is provided with a first side and a second side opposite to the first side, the first side is connected with the cell row, and the second side is connected with the current collection channel.

[0013] In one embodiment, the battery pack structure further comprises a plurality of sealing members, each sealing member is provided corresponding to each explosion-proof valve, each sealing member is provided with a vent hole corresponding to each explosion-proof valve, each sealing member is provided with a first side and a second side opposite to the first side, the first side is connected with the cell, and the second side is connected with the current collection channel.

[0014] The utility model embodiment has the following beneficial effects:

[0015] The exhaust structure and battery pack of this utility model have an inlet connected to the exhaust port of the battery pack. The intake component is installed in the flow channel and is used to intake air from inside the battery pack. The first one-way valve is installed in the flow channel and is used to open or close the exhaust port. When the battery cell in the battery pack experiences thermal runaway, the internal pressure of the battery pack increases. The ejected material inside the battery pack flows out to the outside through the outlet after passing through the exhaust port, the inlet, the first one-way valve and the flow channel. The intake component can accelerate the discharge of the ejected material inside the battery pack. After the ejected material inside the battery pack has finished ejecting, the first one-way valve can close the exhaust port to prevent external materials from flowing into the battery pack. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] in:

[0018] Figure 1 This is an isometric view of the battery pack in one embodiment.

[0019] Figure 2 for Figure 1 Side view of the battery pack shown.

[0020] Figure 3 for Figure 2 The cross-sectional view of AA in the battery pack shown.

[0021] Figure 4 for Figure 3 A magnified view of part B of the battery pack shown.

[0022] Figure 5 for Figure 1 A schematic diagram of the battery cells in the battery pack shown.

[0023] Figure 6 for Figure 1 The diagram shows the busbar and seals in the battery pack.

[0024] Figure 7 for Figure 1 The diagram shows the manifold and the second check valve.

[0025] Figure label:

[0026] 1. Outer shell; 11. Compartmental space;

[0027] 2. Battery cell assembly; 21. Explosion-proof valve;

[0028] 3. Combination channel; 31. Through hole;

[0029] 4. Sealing element; 41. Vent hole;

[0030] 5. Second check valve;

[0031] 6. Exhaust structure; 61. Pipe body; 611. Flow channel; 612. Inlet; 613. Outlet; 62. First check valve; 621. Valve body; 622. Elastic plate; 623. Support; 63. Sealing ring;

[0032] 100. Exhaust port. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0037] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0038] Please combine them together Figures 1 to 4 The exhaust structure 6 provided by this utility model will now be described. The exhaust structure 6 is used in a battery pack.

[0039] The exhaust structure 6 includes: a pipe body 61, an intake assembly, and a first one-way valve 62. The pipe body 61 has a flow channel 611, an inlet 612 and an outlet 613 connected to the flow channel 611. The inlet 612 is connected to the exhaust port 100 of the battery pack. The intake assembly is installed in the flow channel 611 and is used to intake air from inside the battery pack. The first one-way valve 62 is installed in the flow channel 611 and is used to open or close the exhaust port 100.

[0040] It is understood that the inlet 612 of the exhaust structure 6 is connected to the exhaust port 100 of the battery pack, the intake component is installed in the flow channel 611 and is used to intake the inside of the battery pack, and the first one-way valve 62 is installed in the flow channel 611 and is used to open or close the exhaust port 100. When the cells in the battery pack experience thermal runaway, the internal pressure of the battery pack increases, and the ejected material inside the battery pack flows out to the outside from the outlet 613 after passing through the exhaust port 100, the inlet 612, the first one-way valve 62 and the flow channel 611. The intake component can accelerate the discharge of the ejected material inside the battery pack. After the ejected material inside the battery pack has finished ejecting, the first one-way valve 62 can close the exhaust port 100 to prevent external materials from flowing into the battery pack.

[0041] In this embodiment, the first one-way valve 62 includes a valve body 621, an elastic plate 622, and a support 623. The support 623 is connected to the wall of the flow channel 611. The valve body 621 is connected to the elastic plate 622, and the elastic plate 622 is connected to the support 623. The valve body 621 can open or close the exhaust port 100. When the cells in the battery pack experience thermal runaway, the internal pressure of the battery pack increases, which can push the valve body 621 to open the exhaust port 100. The valve body 621 causes the elastic plate 622 to undergo elastic deformation. The ejected material inside the battery pack flows out to the outside from the outlet 613 after passing through the exhaust port 100, the inlet 612, and the flow channel 611. The suction component can accelerate the discharge of the ejected material inside the battery pack. When the ejected material inside the battery pack has finished ejecting, the internal pressure of the battery pack decreases, and the elastic deformation force of the elastic plate 622 drives the valve body 621 to close the exhaust port 100.

[0042] Furthermore, the exhaust structure 6 also includes a sealing ring 63, which is installed on the support 623 and used to seal the support 623 and the valve body 621. Specifically, the sealing ring 63 can be a high-temperature resistant sealing ring 63. By setting the sealing ring 63, the sealing performance between the valve body 621 and the support 623 can be improved after the valve body 621 blocks the exhaust port 100, thereby preventing external substances from entering the exhaust port 100.

[0043] In one embodiment, the exhaust structure 6 further includes a vacuum pumping component. The pipe body 61 is also provided with an interface communicating with the flow channel 611. The interface is located between the first one-way valve 62 and the exhaust port 100. The vacuum pumping component is connected to the interface and is used to create a vacuum so that the valve body 621 closes the exhaust port 100. Specifically, the vacuum pumping component can be a negative pressure pump. The vacuum pumping component can create a vacuum between the exhaust port 100 and the first one-way valve 62, which can assist the valve body 621 in resetting so that the valve body 621 blocks the exhaust port 100.

[0044] In one embodiment, the air intake component can be a fan, which is rotatably connected to the flow channel 611 and used to draw air into the flow channel 611. In this way, the ejected material inside the battery pack can flow out to the outside from the outlet 613 after passing through the exhaust port 100, the inlet 612, the first one-way valve 62 and the confluence channel 3, thereby accelerating the outflow of the ejected material.

[0045] In another embodiment, the air intake component can also be a pump body, which is installed within the flow channel 611 and used to intake air from the flow channel 611. Specifically, the pump body can be a negative pressure pump. This allows the ejected material inside the battery pack to flow out to the outside from the outlet 613 after passing through the exhaust port 100, the inlet 612, the first one-way valve 62, and the manifold 3, thereby accelerating the outflow of the ejected material.

[0046] This utility model also provides a battery pack, which includes the exhaust structure 6 of any of the above embodiments.

[0047] It is understood that the battery pack of this utility model uses the above-mentioned exhaust structure 6, so that the inlet 612 of the exhaust structure 6 is connected to the exhaust port 100 of the battery pack. The suction component is installed in the flow channel 611 and is used to suction air from inside the battery pack. The first one-way valve 62 is installed in the flow channel 611 and is used to open or close the exhaust port 100. When the cells inside the battery pack experience thermal runaway, the internal pressure of the battery pack increases. The ejected material inside the battery pack flows out to the outside from the outlet 613 after passing through the exhaust port 100, the inlet 612, the first one-way valve 62 and the flow channel 611. The suction component can accelerate the discharge of the ejected material inside the battery pack. After the ejected material inside the battery pack has finished ejecting, the first one-way valve 62 can close the exhaust port 100 to prevent external materials from flowing into the battery pack.

[0048] In one embodiment, such as Figures 1 to 7As shown, the battery pack includes a housing 1, a cell assembly 2, a busbar channel 3, a seal 4, and multiple second one-way valves 5. The housing 1 has an accommodating space 11. The cell assembly 2 and the busbar channel 3 are both installed in the accommodating space 11. The cell assembly 2 includes multiple cells arranged in sequence. Each cell is equipped with an explosion-proof valve 21. The busbar channel 3 is equipped with through holes 31 that correspond one-to-one with each cell. Each through hole 31 is equipped with a second one-way valve 5. The second one-way valve 5 can be opened to the side of the busbar channel 3. Each through hole 31 is connected to the explosion-proof valve 21 through the seal 4. The busbar channel 3 is connected to the vent 100. This ensures that when a single cell experiences thermal runaway, the ejected material inside the single cell will flow into the manifold 3 through a single through-hole 31 and a single second one-way valve 5, and then flow through the manifold 3 to the exhaust port 100, inlet 612 and flow channel 611 before flowing out to the outside from the outlet 613, thus preventing other cells from experiencing thermal runaway and avoiding risks such as battery pack explosion or rapid fire.

[0049] It should be noted that the battery pack has longitudinal beams, and the longitudinal beams are equipped with a busbar channel 3.

[0050] In one embodiment, such as Figures 5 to 7 As shown, multiple battery cells are arranged sequentially on one side of the manifold 3 to form a battery cell array. The sealing element 4 has a first side and a second side opposite to the first side. The first side is connected to the battery cell array, and the second side is connected to the manifold 3. The sealing element 4 has vent holes 41 corresponding to each explosion-proof valve 21. Specifically, the sealing element 4 is a high-temperature resistant sealing ring 63. The sealing element 4 seals the connection between the battery cell array and the wall of the through hole 31, preventing the ejected material from flowing out from the seal between the battery cell array and the wall of the through hole 31 after the explosion-proof valve 21 ruptures. By providing a sealing element 4 with multiple vent holes 41 corresponding to each explosion-proof valve 21, the ejected material from the explosion-proof valve 21 can flow into the manifold 3 through the vent holes 41 and the through hole 31.

[0051] Of course, in other embodiments, each sealing element 4 is provided in a one-to-one correspondence with each explosion-proof valve 21. Each sealing element 4 has a vent hole 41 corresponding to each explosion-proof valve 21. Each sealing element 4 has a first side and a second side opposite to the first side. The first side is connected to the battery cell, and the second side is connected to the manifold 3. Specifically, each sealing ring 63 is a high-temperature resistant sealing ring 63. Each sealing element 4 can seal the connection between each battery cell and the hole wall of each through hole 31, so that the ejected material after the explosion-proof valve 21 ruptures will not flow out from the seal between the battery cell and the hole wall of the through hole 31.

[0052] Of course, in another embodiment, the battery cell also includes a raised structure and a protective patch. The raised structure is connected to the battery cell housing and communicates with the through hole 31. The raised structure is connected to the explosion-proof valve 21 and is used to fix the explosion-proof valve 21. The protective patch is attached to the explosion-proof valve 21. By setting the raised structure connected to the housing and the explosion-proof valve 21 connected to the raised structure, the explosion-proof valve 21 and the battery cell housing are sealed through the raised structure. Furthermore, after the explosion-proof valve 21 explodes, it can rupture inside the raised structure, giving the explosion-proof valve 21 an explosion space. The protective patch can protect the explosion-proof valve 21 and prevent damage to the explosion-proof valve 21 during installation.

[0053] It should be noted that the first check valve 62 and the second check valve 5 can be solenoid valves or mechanical valves.

[0054] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. An exhaust structure, characterized in that, include: The device comprises a tube body, an air intake assembly, and a first one-way valve. The tube body has a flow channel and an inlet and an outlet connected to the flow channel. The inlet is connected to an exhaust port of the battery pack. The air intake assembly is installed in the flow channel and is used to intake air from the inside of the battery pack. The first one-way valve is installed in the flow channel and is used to open or close the exhaust port.

2. The exhaust structure according to claim 1, characterized in that, The first one-way valve includes a valve body, an elastic plate, and a support. The support is connected to the wall of the flow channel, the valve body is connected to the elastic plate, and the elastic plate is connected to the support. The valve body can open or close the exhaust port.

3. The exhaust structure according to claim 2, characterized in that, The exhaust structure also includes a sealing ring, which is installed on the support and used to seal the support and the valve body.

4. The exhaust structure according to claim 2, characterized in that, The exhaust structure also includes a vacuum pumping component, and the pipe body is also provided with an interface that communicates with the flow channel. The interface is located between the first one-way valve and the exhaust port. The vacuum pumping component is connected to the interface and is used to draw a vacuum so that the valve body closes the exhaust port.

5. The exhaust structure according to claim 1, characterized in that, The air intake component can be a fan, which is rotatably connected to the flow channel and used to draw air into the flow channel.

6. The exhaust structure according to claim 1, characterized in that, The air intake component can also be a pump body, which is installed in the flow channel and used to intake air from the flow channel.

7. A battery pack, characterized in that, The battery pack includes the venting structure as described in any one of claims 1-6.

8. The battery pack according to claim 7, characterized in that, The battery pack includes a housing, a cell assembly, a busbar channel, a seal, and multiple second one-way valves. The housing has an accommodating space, and the cell assembly and the busbar channel are both installed within the accommodating space. The cell assembly includes multiple cells arranged in sequence, and each cell is equipped with an explosion-proof valve. The busbar channel has through holes corresponding to each cell, and each through hole is equipped with a second one-way valve. The second one-way valve can be opened towards the busbar channel. Each through hole is connected to the explosion-proof valve through the seal, and the busbar channel is connected to the vent.

9. The battery pack according to claim 8, characterized in that, Multiple battery cells are arranged sequentially on one side of the busbar to form a battery cell array. The sealing element has a first side and a second side opposite to the first side. The first side is connected to the battery cell array, and the second side is connected to the busbar. The sealing element has vent holes that correspond one-to-one with each of the explosion-proof valves.

10. The battery pack according to claim 8, characterized in that, The battery pack structure also includes multiple sealing elements, each of which is corresponding to one of the explosion-proof valves. Each sealing element has a vent hole corresponding to one of the explosion-proof valves. Each sealing element has a first side and a second side opposite to the first side. The first side is connected to the battery cell, and the second side is connected to the busbar channel.

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