Battery assembly and vehicle

Abstract

The utility model provides a battery assembly and a vehicle. According to an example of the present application, a battery assembly includes: a battery tray including a tray body and a smoke discharge channel; the smoke discharge channel comprises a smoke discharge flue and a plurality of through holes which are communicated with each other, and the smoke discharge flue is communicated with the outside; the plurality of single batteries are mounted on the tray body, each single battery is provided with an anti-explosion valve, and the through holes and the anti-explosion valves are oppositely arranged and are in one-to-one correspondence; the stop assembly comprises a plurality of stop pieces and a plurality of pre-tightening pieces, the plurality of stop pieces correspond to the plurality of through holes one by one, and the stop pieces are movably arranged at the corresponding through holes; the stop piece is provided with a closing position and an opening position, the stop piece closes the corresponding through hole in the closing position, and the stop piece opens the through hole in the opening position; the pre-tightening piece abuts against the stop piece and is used for providing pre-tightening force for keeping the stop piece at the closing position. The scheme can reduce the risk of thermal runaway of the battery assembly.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, and more specifically, to a battery assembly and a vehicle. Background Technology

[0002] The battery pack is an energy storage device and an important component of hybrid and electric vehicles. The battery pack comprises multiple battery modules, each containing multiple individual cells, each equipped with an explosion-proof valve.

[0003] During use, if the internal pressure of a single battery cell increases to a threshold, the explosion-proof valve will open, allowing high-temperature splashes such as smoke and flames inside the cell to escape. However, the smoke and flames expelled through the explosion-proof valve of this single battery cell may affect other normal battery cells, posing a risk of thermal runaway to the entire battery assembly. Utility Model Content

[0004] This application provides a battery assembly that can reduce the risk of thermal runaway in the battery assembly.

[0005] In a first aspect, this application provides a battery assembly, comprising:

[0006] A battery tray includes a tray body and a smoke exhaust channel; the smoke exhaust channel includes a connected smoke exhaust duct and multiple through holes, and the smoke exhaust duct is connected to the outside.

[0007] Multiple individual batteries are installed on the tray body. Each individual battery is equipped with an explosion-proof valve. The through holes and the explosion-proof valves are arranged opposite to each other and correspond one-to-one.

[0008] A stop assembly includes multiple stop members and multiple pre-tightening members. Each of the multiple stop members corresponds to one of the multiple through holes. Each stop member is movably disposed at the corresponding through hole. Each stop member has a closed position and an open position. In the closed position, the stop member closes the corresponding through hole. In the open position, the stop member opens the through hole.

[0009] The preload member presses against the stop member to provide a preload force for holding the stop member in the closed position.

[0010] Optionally, the plurality of individual battery cells include a first individual battery cell and a second individual battery cell, wherein the first individual battery cell and the second individual battery cell are located on opposite sides of the exhaust channel;

[0011] The plurality of through holes include a first through hole and a second through hole, wherein the first through hole corresponds to the explosion-proof valve of the first single cell and the second through hole corresponds to the explosion-proof valve of the second single cell;

[0012] The plurality of stop members include a first stop member and a second stop member, wherein the first stop member is movably disposed in the first through hole and the second stop member is movably disposed in the second through hole;

[0013] The preload member is elastic and is clamped between the first stop member and the second stop member to provide a preload force for holding the first stop member and the second stop member in the closed position.

[0014] Optionally, the pretensioner includes a first pressing part and a second pressing part connected together, the first pressing part pressing against the first stop, and the second pressing part pressing against the second stop;

[0015] The first pressing part and the second pressing part have an included angle.

[0016] Optionally, the included angle is an acute angle.

[0017] Optionally, the pretensioner further includes a reinforcing part located between the first pressing part and the second pressing part, connecting the first pressing part and the second pressing part;

[0018] The width of the reinforcing part is greater than the width of the first pressing part and also greater than the width of the second pressing part.

[0019] Optionally, the first pressing portion includes a connected first body portion and a first end portion, the first end portion abutting against the first stop member, the first end portion being arc-shaped, and the first stop member being planar; and / or,

[0020] The second pressing part includes a second body part and a second end part connected together. The second end part abuts against the second stop member. The second end part is arc-shaped, and the second stop member is planar.

[0021] Optionally, the stop assembly further includes a support member disposed within the flue and supporting the pretensioner.

[0022] Optionally, the support member includes a support shaft, and the preload is mounted on the support shaft.

[0023] Optionally, the single battery cell includes a first side and a second side facing each other. The first side is provided with at least one first positive terminal and at least one first negative terminal, and the second side is provided with at least one second positive terminal and at least one second negative terminal. The first positive terminal and the second negative terminal face each other, and the first negative terminal and the second positive terminal face each other. The explosion-proof valve is disposed on the first side or the second side; and / or,

[0024] The battery assembly further includes a first heat exchange plate and a second heat exchange plate, the first heat exchange plate and the second heat exchange plate being respectively disposed on opposite sides of the individual battery cell; and / or,

[0025] The battery assembly also includes a containment member located between the individual battery cell and the exhaust channel, and surrounding the outer periphery of the through hole.

[0026] Secondly, this application also provides a vehicle comprising: a battery assembly as described in any of the preceding claims.

[0027] The battery pack and vehicle provided in this application have at least the following advantages:

[0028] Under normal conditions, multiple stop components are in the closed position, sealing their corresponding through holes and preventing external debris from entering the individual battery cells and affecting battery performance. Furthermore, the pre-tightening component presses against the stop components, providing a pre-tightening force to keep them in the closed position and preventing them from shaking under external force and affecting the sealing of the through holes. When the internal gas pressure of a single battery cell reaches a threshold, the explosion-proof valve opens. The impact of high-temperature splashes can overcome this pre-tightening force, pushing open the corresponding stop component, allowing the high-temperature splashes to enter the exhaust duct and exit from the exhaust port. At this time, the remaining stop components remain in the closed position under the pre-tightening force, sealing the through holes and thus preventing high-temperature splashes from affecting the normal operation of the individual battery cells. Attached Figure Description

[0029] Figure 1 This is a three-dimensional schematic diagram of a battery assembly according to an embodiment;

[0030] Figure 2 This is a partial structural diagram of the battery assembly at the exhaust channel;

[0031] Figure 3 This is a cross-sectional view of the smoke exhaust duct with the stop assembly in the closed position;

[0032] Figure 4 This is a cross-sectional view of the smoke exhaust channel with the stop assembly in the open position;

[0033] Figure 5 This is an exploded view of the smoke exhaust duct and the flexible stop.

[0034] Figure 6 This is a schematic diagram of the arrangement of multiple first-cell cells;

[0035] Figure 7 This is a schematic diagram of the arrangement of multiple second-cell cells;

[0036] Figure 8 This is a schematic diagram showing the positions of the first and second heat exchange plates.

[0037] Explanation of reference numerals in the attached figures:

[0038] 10. Battery tray; 11. Tray body; 111. Exhaust port; 12. Exhaust channel; 121. Exhaust duct; 122. Through hole; 122a. First through hole; 122b. Second through hole; 123. Side plate; 124. Top plate; 125. Bottom plate; 20. Single battery cell; 20a. First single battery cell; 20b. Second single battery cell; 21. Explosion-proof valve; 22. First side; 23. Second side; 24. First positive terminal; 25. First negative terminal; 26. Second positive terminal; 27. Second negative terminal; 30. Stop 31. Stop component; 31a. First stop component; 31b. Second stop component; 32. Pre-tightening component; 321. First pressing part; 3211. First body part; 3212. First end part; 322. Second pressing part; 3221. Second body part; 3222. Second end part; 323. Reinforcing part; 33. First rotating shaft; 34. First baffle; 35. Second rotating shaft; 36. Second baffle; 37. Support shaft; 38. Third baffle; 40. Containment component; 51. First heat exchange plate; 52. Second heat exchange plate. Detailed Implementation

[0039] This application provides a battery assembly and a vehicle. The battery assembly and the vehicle are described in detail below with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and implementation methods can be combined with each other.

[0040] Please refer to Figures 1 to 5 This application provides a battery assembly including a battery tray 10, a plurality of individual battery cells 20 and a stop assembly 30.

[0041] The battery tray 10 includes a tray body 11 and a smoke exhaust channel 12. The smoke exhaust channel 12 includes a connected smoke exhaust duct 121 and multiple through holes 122, and the smoke exhaust duct 121 communicates with the outside. For example, the tray body 11 may have a smoke exhaust port 111, and the smoke exhaust duct 121 communicates with the outside through the smoke exhaust port 111 on the tray body 11. The smoke exhaust channel 12 may be integrally formed with the tray body 11, but is not limited thereto.

[0042] Multiple individual batteries 20 are installed on the tray body 11. Each individual battery 20 is equipped with an explosion-proof valve 21. The through hole 122 and the explosion-proof valve 21 are arranged opposite to each other and correspond one-to-one. When the internal air pressure of the individual battery 20 increases and reaches the threshold pressure for opening the explosion-proof valve 21, the explosion-proof valve 21 on the individual battery 20 will open, and the high-temperature splashes such as flames, smoke and gas inside can be ejected from the explosion-proof valve 21.

[0043] The stop assembly 30 includes multiple stop members 31 and pre-tightening members 32. The multiple stop members 31 correspond one-to-one with multiple through holes 122. The stop members 31 are movably disposed at the corresponding through holes 122, and the movement includes, but is not limited to, rotation. The stop members 31 have a closed position and an open position. In the closed position, the stop members 31 close the corresponding through holes 122. In the open position, the stop members 31 open the through holes 122.

[0044] The preload 32 presses against the stop 31 to provide preload force for the stop 31 to remain in the closed position.

[0045] Please refer to Figure 3 Under normal conditions, multiple stop members 31 are in the closed position, sealing the corresponding through holes 122 to prevent external debris from entering the individual battery cell 20 and affecting battery performance. Furthermore, the preload member 32 presses against the stop member 31, providing a preload force to keep the stop member 31 in the closed position, preventing the stop member 31 from shaking under external force and affecting the sealing of the through hole 122. Please refer to... Figure 4 When the internal pressure of a single cell 20 reaches a threshold, the explosion-proof valve 21 opens. The impact of the high-temperature splashes overcomes the pre-tightening force, pushing open the corresponding stop 31, allowing the high-temperature splashes to enter the exhaust duct 121 through the through hole 122 and be discharged to the outside. At this time, the remaining stop 31 remain in the closed position under the pre-tightening force, sealing the through hole 122 and preventing the high-temperature splashes from affecting the normal single cell 20. Furthermore, as the high-temperature splashes enter the exhaust duct 121, the pressure inside the exhaust duct 121 increases. Under this high pressure, the remaining stop 31 will also be pressed tighter, thus better sealing the corresponding through hole 122.

[0046] Therefore, this solution allows the high-temperature splashes from the faulty cell 20 to smoothly enter the exhaust duct 121, while also preventing the high-temperature splashes from moving around in the exhaust duct 121 and affecting other normal cells 20, thus reducing the risk of thermal runaway of the entire battery assembly.

[0047] It should be noted that in this scheme, multiple individual batteries 20 can be located on the same side of the smoke exhaust channel 12; or, some of the multiple individual batteries 20 are located on one side of the smoke exhaust channel 12, and the other part is located on the other side of the smoke exhaust channel 12.

[0048] In one embodiment, the plurality of individual cells 20 include a first individual cell 20a and a second individual cell 20b, the first individual cell 20a and the second individual cell 20b being located on opposite sides of the exhaust duct 12.

[0049] The plurality of through holes 122 include a first through hole 122a and a second through hole 122b. The first through hole 122a corresponds to the explosion-proof valve 21 of the first single cell 20a, and the second through hole 122b corresponds to the explosion-proof valve 21 of the second single cell 20b.

[0050] The plurality of stop members 31 include a first stop member 31a and a second stop member 31b. The first stop member 31a is movably disposed in the first through hole 122a, and the second stop member 31b is movably disposed in the second through hole 122b.

[0051] The pre-tightening member 32 is elastic and is clamped between the first stop member 31a and the second stop member 31b.

[0052] The elastic clamping mechanism of the pre-tightening member 32 interconnects the pre-tightening forces of the first stop 31a and the second stop 31b. When one stop 31 is impacted by high-temperature splashes, the pre-tightening member 32 transfers the force to the other stop 31, improving its sealing effect on the through hole 122. Even if a single cell 20 malfunctions and the high-temperature splashes push open the corresponding stop 31, the pre-tightening member 32 can still ensure that the other stop 31 maintains a stable pre-tightening force, effectively preventing the high-temperature splashes from moving within the exhaust duct 121 to the other side and affecting the normal single cell 20.

[0053] The pretensioner 32 can be a spring structure, an elastic metal sheet structure, or an elastic rubber structure, but is not limited to these.

[0054] In one embodiment, the pretensioner 32 includes a first pressing part 321 and a second pressing part 322 connected together. The first pressing part 321 presses against the first stop 31a, and the second pressing part 322 presses against the second stop 31b. The first pressing part 321 and the second pressing part 322 have an included angle.

[0055] The included angle causes the first pressing part 321 and the second pressing part 322 to undergo initial elastic deformation during installation. The potential energy is converted into a preload force on the stop member 31, ensuring that the stop member 31 fits tightly against the through hole 122 under normal conditions.

[0056] Furthermore, the included angle is an acute angle. The acute angle design allows the preload member 32 to meet the preload requirements while occupying less space, which helps to improve the overall integration and compactness of the battery assembly. For example, the included angle can be 20°, 30°, 40°, 50°, 60°, 70°, or 80°, but is not limited to these.

[0057] like Figure 3In the illustrated embodiment, multiple stop members 31 are in the closed position. The first pressing part 321 presses against the first stop member 31a, closing the first through hole 122a, and the second pressing part 322 presses against the second stop member 31b, closing the second through hole 122b, to prevent external debris from entering the interior of the single cell 20 and affecting battery performance. Figure 4 In the illustrated embodiment, one of the plurality of stop members 31 is in the open position, while the remaining stop members 31 are in the closed position. The first stop member 31a is pushed open by the high-temperature splash. At this time, the second pressing part 31b can press more tightly against the second stop member 31b.

[0058] In one embodiment, the pretensioner 32 further includes a reinforcing portion 323, which is located between the first pressing portion 321 and the second pressing portion 322, connecting the first pressing portion 321 and the second pressing portion 322; wherein the width of the reinforcing portion 323 is greater than the width of the first pressing portion 321 and greater than the width of the second pressing portion 322, so as to improve the connection strength between the first pressing portion 321 and the second pressing portion 322.

[0059] Furthermore, the first pressing part 321 and the second pressing part 322 can have the same size to simplify the structure.

[0060] like Figure 3 In the embodiment shown, the pretensioner 32 is a V-shaped elastic metal sheet structure. The high fatigue strength of the metal material ensures long-term stability, and the included angle deformation range is controllable, which can accurately match the pretension force requirements.

[0061] In one embodiment, the first pressing part 321 includes a first body part 3211 and a first end part 3212 connected together. The first end part 3212 abuts against the first stop member 31a. The first end part 3212 is arc-shaped, and the first stop member 31a is planar.

[0062] The first end 3212 is designed with a curved surface. When it contacts the planar first stop 31a, the curved surface can increase the contact area with the first stop 31a to a certain extent compared to the line contact between planar surfaces. The larger contact area allows the preload to be distributed more evenly on the first stop 31a, avoiding local stress concentration. This helps to better maintain the sealing effect of the first stop 31a on the through hole 122, preventing external debris from entering the interior of the single cell 20 and ensuring battery performance.

[0063] Similarly, the second pressing part 322 includes a connected second body part 3221 and a second end part 3222. The second end part 3222 abuts against the second stop member 31b. The second end part 3222 is arc-shaped, and the second stop member 31b is planar.

[0064] In one embodiment, the stop assembly 30 further includes a support member that supports the pretensioner 32. The support member provides a stable support base for the pretensioner 32. During battery operation, the pretensioner 32 is subjected to various external forces due to factors such as vehicle vibration and internal battery pressure fluctuations. The support member can effectively resist these external forces, preventing the pretensioner 32 from shifting, shaking, or falling within the exhaust channel 12, ensuring that it always remains in the correct position.

[0065] It should be noted that the shape and structure of the support member are not limited, as long as it can support the pre-tightening member 32 and does not hinder the movement of the first pressing part 321 and the second pressing part 322.

[0066] In one embodiment, the support includes a support shaft 37 installed within the smoke exhaust duct 12, with a preload member 32 suspended on the support shaft 37. Using the support shaft 37 as the support for the elastic stop member 31 greatly simplifies the design of the support.

[0067] Compared to complex frames or multi-component support structures, the design concept of the support shaft 37 is simple and clear, with lower processing and manufacturing difficulty, effectively reducing production costs. Furthermore, the preload 32, mounted on the support shaft 37, ensures a greater degree of freedom of movement for the preload 32. When the internal pressure of the single battery cell 20 reaches the threshold, the explosion-proof valve 21 opens, allowing the high-temperature splashes to push open the stop 31 and overcome the preload force.

[0068] Please refer to Figure 5 , Figure 6 and Figure 7 and combined Figures 1 to 4 There are multiple first single cells 20a and multiple second single cells 20b. The number of first through holes 122a and first stop members 31a corresponds to the number of first single cells 20a. The number of second through holes 122b and second stop members 31b corresponds to the number of second single cells 20b. There are multiple pre-tightening members 32. A pre-tightening member 32 is provided between each of the oppositely arranged first stop members 31a and second stop members 31b.

[0069] The first stop 31a is rotatably mounted at the first through hole 122a, and its rotation opens or closes the through hole 122a. Specifically, multiple first stopes 31a are mounted on the smoke exhaust channel 12 via a first rotating shaft 33. Multiple first baffles 34 are provided on the first rotating shaft 33, and a first stop 31a is positioned between two adjacent first baffles 34. The first baffles 34 can separate the multiple first stopes 31a from each other, preventing potential collisions, compression, or interference between adjacent first stopes 31a. This ensures that each first stop 31a functions in the correct position, minimizing its axial movement along the first rotating shaft 33.

[0070] Multiple second stop members 31b can also be installed in the smoke exhaust duct 12 via the second rotating shaft 35. Multiple second baffles 36 are provided on the second rotating shaft 35, and a second stop member 31b is provided between two adjacent second baffles 36.

[0071] The support also includes multiple third baffles 38, which are threaded onto the support shaft 37. A preload member 32 is provided between two adjacent third baffles 38. The third baffles 38 can separate the multiple preload members 32 from each other, avoiding possible collisions, squeezing, or interference between adjacent preload members 32. This ensures that each preload member 32 functions in the correct position and minimizes its axial movement along the support shaft 37.

[0072] In one embodiment, the battery assembly further includes a containment member 40, which may be frame-shaped, but is not limited thereto. The containment member 40 is located between the individual battery cell 20 and the exhaust channel 12, and is disposed around the outer periphery of the through hole 122.

[0073] With this configuration, when the explosion-proof valve 21 of the individual battery 20 is opened and high-temperature splashes are discharged, the containment component 40 can effectively prevent these discharges from leaking through the gap between the through hole 122 and the surrounding area, ensuring that the discharges can only enter the smoke exhaust channel 12 through the through hole 122, reducing the risk of disorderly diffusion of discharges inside the battery assembly, and better protecting other normal individual batteries 20.

[0074] The number of blocking components 40 can be multiple, corresponding one-to-one with multiple through holes 122, with each blocking component 40 arranged around the outer periphery of the corresponding through hole 122.

[0075] In one embodiment, the smoke exhaust duct 12 has a rectangular cross-section and includes two side plates 123, a top plate 124, and a bottom plate 125. The two side plates 123 are located between and connect the top plate 124 and the bottom plate 125, forming the smoke exhaust duct 12. One of the two side plates 123 has the aforementioned first through hole 122a, and the other has the aforementioned second through hole 122b.

[0076] Furthermore, when the battery tray 10 also includes a longitudinal beam for separating the first single cell 20a and the second single cell 20b, the smoke exhaust channel 12 can utilize this longitudinal beam structure and be integrally formed with the longitudinal beam, which can improve the structural strength of the battery tray 10 while also saving materials and costs.

[0077] In some other embodiments, the cross-section of the smoke exhaust channel 12 can be a symmetrical or asymmetrical shape, such as a circle or an ellipse.

[0078] In one embodiment, the single-cell battery 20 includes a first side 22 and a second side 23 facing each other. The first side 22 is provided with at least one first positive electrode post 24 and at least one first negative electrode post 25, and the second side 23 is provided with at least one second positive electrode post 26 and at least one second negative electrode post 27. The first positive electrode post 24 and the second negative electrode post 27 are directly opposite each other, and the first negative electrode post 25 and the second positive electrode post 26 are directly opposite each other. This shortens the electron transport path of each single-cell battery 20, reduces the internal resistance of the cell, thereby reducing heat generation and further reducing the risk of thermal runaway.

[0079] Please refer to Figure 8 Here, "directly opposite" means that the first positive terminal 24 and the second negative terminal 27 are approximately collinear in the horizontal direction, and the first negative terminal 25 and the second positive terminal 26 are collinear in the horizontal direction.

[0080] Furthermore, the explosion-proof valve 21 is disposed on the first side 22 or the second side 23.

[0081] It is easy to understand that, since the positive / negative terminals on the first side 22 correspond one-to-one with the positive / negative terminals on the second side 23, multiple individual battery cells 20 can be arranged side by side, and the battery module does not need to alternately flip the individual battery cells 20 for series and parallel connection. Furthermore, this also allows the explosion-proof valves 21 of multiple individual battery cells 20 to face the same side, so as to correspond one-to-one with multiple through holes 122.

[0082] like Figure 6 and Figure 7 In the illustrated embodiment, the explosion-proof valve 21 is disposed on the first side portion 22 and located between the first positive terminal 24 and the first negative terminal 25. The first side portion 22 and the second side portion 23 are both short sides. Each first single cell 20a is arranged with its long sides parallel to each other with the short sides of the first side portion 22 and the second side portion 23 as the axial direction. Each second single cell 20b is arranged with its long sides parallel to each other with the short sides of the first side portion 22 and the second side portion 23 as the axial direction. The explosion-proof valves 21 of the first single cell 20a and the second single cell 20b face each other.

[0083] Of course, in other embodiments, the explosion-proof valve 21 can also be disposed on the second side 23, located between the second positive terminal 26 and the second negative terminal 27. Alternatively, the explosion-proof valve 21 can be disposed at the bottom of the single cell 20.

[0084] Please continue to refer to this. Figure 8In one embodiment, the battery assembly further includes a first heat exchange plate 51 and a second heat exchange plate 52, with the first heat exchange plate 51 respectively disposed on opposite sides of the individual battery cell 20. The first heat exchange plate 51 and the second heat exchange plate 52 can simultaneously cool the individual battery cell on opposite sides of the individual battery cell 20, which helps to reduce the heat transfer path, improve heat transfer efficiency, and make the cell temperature distribution of the individual battery cell 20 more uniform.

[0085] The first heat exchange plate 51 is bonded to the top of the single cell 20 with thermally conductive adhesive, and the second heat exchange plate 52 is bonded to the bottom of the single cell 20 with thermally conductive adhesive. The first heat exchange plate 51 and the second heat exchange plate 52 can be liquid cooling plates, but are not limited to this.

[0086] It should be noted that the single cell 20 mentioned above can be either the first single cell 20a or the second single cell 20b.

[0087] This application also provides a vehicle that includes the battery assembly of any of the above embodiments or implementations.

[0088] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A battery assembly, comprising: The battery tray comprises a tray body and a smoke exhaust channel; the smoke exhaust channel comprises a smoke exhaust passage and a plurality of through holes connected to the smoke exhaust passage, and the smoke exhaust passage is connected to the outside; A plurality of single batteries are installed on the tray body, and the single batteries are provided with explosion-proof valves; the through holes and the explosion-proof valves are arranged opposite to each other and correspond to each other; A stop component comprises a plurality of stop pieces and a plurality of pre-tightening pieces; the plurality of stop pieces correspond to the plurality of through holes; the stop pieces are movably arranged at the corresponding through holes; the stop pieces have a closed position and an open position; in the closed position, the stop pieces close the corresponding through holes; in the open position, the stop pieces open the through holes; The pre-tightening pieces press against the stop pieces to provide pre-tightening force for keeping the stop pieces in the closed position. The plurality of single batteries comprise first single batteries and second single batteries; the first single batteries and the second single batteries are located on opposite sides of the smoke exhaust channel; 2. The battery assembly of claim 1, wherein, The plurality of through holes comprise first through holes and second through holes; the first through holes correspond to the explosion-proof valves of the first single batteries; the second through holes correspond to the explosion-proof valves of the second single batteries; The plurality of stop pieces comprise first stop pieces and second stop pieces; the first stop pieces are movably arranged at the first through holes; the second stop pieces are movably arranged at the second through holes; The pre-tightening pieces are elastic and clamped between the first stop pieces and the second stop pieces to provide pre-tightening force for keeping the first stop pieces and the second stop pieces in the closed position. The pre-tightening pieces comprise first pressing parts and second pressing parts connected to each other; the first pressing parts press against the first stop pieces; the second pressing parts press against the second stop pieces; 3. The battery assembly of claim 2, wherein, The first pressing parts and the second pressing parts have an included angle. The included angle is an acute angle.

4. The battery assembly of claim 3, wherein, The pre-tightening pieces further comprise a reinforcing part between the first pressing parts and the second pressing parts, connecting the first pressing parts and the second pressing parts; 5. The battery assembly of claim 3, wherein, The width of the reinforcing part is greater than the width of the first pressing parts and the width of the second pressing parts. The first pressing parts comprise first body parts and first end parts connected to each other; the first end parts abut against the first stop pieces; the first end parts are circular arc curved surfaces; and / or 6. The battery assembly of claim 3, wherein, The second pressing parts comprise second body parts and second end parts connected to each other; the second end parts abut against the second stop pieces; the second end parts are circular arc curved surfaces; and / or The stop component further comprises a support piece arranged in the smoke exhaust passage to support the pre-tightening pieces.

7. The battery assembly of claim 3, wherein, The support piece comprises a support shaft, and the pre-tightening pieces are hung on the support shaft.

8. The battery assembly of claim 7, wherein, ​ 9. The battery assembly of claim 1, wherein, The monomer battery comprises opposite first and second sides, the first side is provided with at least one first positive pole column and at least one first negative pole column, the second side is provided with at least one second positive pole column and at least one second negative pole column, the first positive pole column and the second negative pole column are opposite, and the first negative pole column and the second positive pole column are opposite; the explosion-proof valve is arranged on the first side or the second side; and / or, The battery assembly further comprises first and second heat exchange plates, and the first and second heat exchange plates are arranged on opposite sides of the monomer battery respectively; and / or, The battery assembly further comprises a blocking member, which is located between the monomer battery and the smoke exhaust channel and surrounds the outer periphery of the through hole.

10. A vehicle characterized by comprising: The battery assembly comprises: The battery assembly according to any one of claims 1 to 9.

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