Liquid storage assembly, battery cell, battery pack and vehicle

Abstract

The utility model discloses a liquid storage assembly, a battery monomer, a battery pack and a vehicle, the liquid storage assembly is used for the battery monomer and comprises an insulating sheet and a convex part, the insulating sheet is suitable for being arranged between an electrode assembly of the battery monomer and a first wall of a shell, and a liquid storage cavity is arranged in the insulating sheet; a first through hole and a second through hole are formed in the two opposite surfaces of the insulating sheet in the thickness direction of the insulating sheet respectively and communicate with the liquid storage cavity. The protruding part is arranged on the surface of the insulating sheet and is suitable for extending into the electrode assembly. The liquid storage assembly provided by the utility model has the advantages that the electrolyte capacity in the shell is high while the electrode assembly is prevented from being contacted with the shell, and the service life of the battery monomer is long.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a liquid storage component, a battery cell, a battery pack, and a vehicle. Background Technology

[0002] Battery cells typically contain insulating sheets, which effectively prevent the electrode assembly from contacting the battery cell casing. However, the insulating sheets occupy part of the casing space, reducing the space inside the casing for containing electrolyte. This may lead to poor wetting of the electrode assembly, thereby affecting the lifespan of the battery cell. Utility Model Content

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of this utility model propose a liquid storage component, which has the advantages of preventing the electrode assembly from contacting the casing while having a high electrolyte capacity inside the casing and a long service life of the battery cells.

[0005] Embodiments of this utility model also provide a battery cell, a battery pack, and a vehicle.

[0006] The liquid storage assembly of this utility model embodiment is used in a battery cell, including an insulating sheet and a protrusion. The insulating sheet is adapted to be disposed between the electrode assembly and the first wall of the housing of the battery cell. A liquid storage cavity is provided in the insulating sheet. A first through hole and a second through hole are respectively formed on two opposing surfaces of the insulating sheet in the thickness direction. The first through hole and the second through hole communicate with the liquid storage cavity. The protrusion is disposed on the surface of the insulating sheet and is adapted to extend into the interior of the electrode assembly.

[0007] According to the embodiment of this utility model, the electrolyte storage assembly has a storage cavity within an insulating sheet, and a first through hole and a second through hole communicating with the storage cavity are respectively provided on two opposing surfaces of the insulating sheet along its thickness direction. The electrolyte in the housing can fill the storage cavity, ensuring that the insulating sheet separates the electrode assembly from the first wall of the housing while effectively increasing the electrolyte capacity within the housing. Simultaneously, by providing a protrusion on the upper surface of the insulating sheet, the protrusion can extend into the electrode assembly to open the gap formed by the bottom diaphragm of the electrode assembly. Therefore, when the electrode assembly expands during charging and discharging, thus squeezing the insulating sheet, the electrolyte in the storage cavity can be pumped through the first or second through hole to the positive and negative electrode plates inside the electrode assembly, effectively preventing poor wetting of the electrode assembly and resulting in a long service life for the battery cells.

[0008] In some embodiments, the protrusion is disposed corresponding to the second through hole, and the second through hole extends through the protrusion along the thickness direction of the insulating sheet.

[0009] In some embodiments, the area of ​​the outer contour of the cross-section of the protrusion gradually decreases or decreases stepwise in the direction away from the insulating sheet;

[0010] Alternatively, the liquid reservoir assembly may further include an injection needle connected to the protrusion.

[0011] In some embodiments, the liquid storage assembly further includes a one-way valve disposed in the second through hole, through which electrolyte in the liquid storage chamber can flow to the protrusion.

[0012] In some embodiments, the number of the first through holes is multiple, and an array of the multiple first through holes is disposed on the surface of the insulating sheet.

[0013] In some embodiments, the number of the second through holes is one, and the second through hole is located at the center of the surface of the insulating sheet;

[0014] Alternatively, there may be multiple second through holes, with an array of multiple second through holes disposed on the surface of the insulating sheet.

[0015] In some embodiments, an explosion-proof valve is provided on the bottom wall of the housing, and a thinning groove is provided on the upper and lower surfaces of the region of the insulating sheet that overlaps with the explosion-proof valve in the thickness direction of the insulating sheet, and / or, the protrusion is provided on the upper surface of the region of the insulating sheet that overlaps with the explosion-proof valve in the thickness direction of the insulating sheet.

[0016] In some embodiments, the liquid storage assembly further includes a side plate adapted to be disposed between the side wall of the housing and the electrode assembly, the side plate being connected to the insulating sheet, and the side of the side plate facing the side wall of the housing having a liquid storage groove extending along the thickness direction of the insulating sheet, the liquid storage groove communicating with the liquid storage cavity.

[0017] In some embodiments, the liquid storage tank extends through the side plate along the thickness direction of the side plate, the lower end of the side plate is connected to the side of the insulating sheet facing the side wall of the housing, and the side of the insulating sheet is provided with a third through hole connecting the liquid storage cavity and the liquid storage tank.

[0018] In some embodiments, the liquid storage assembly further includes a liquid storage bag connected to the insulating sheet and adapted to wrap the outer peripheral surface of the electrode assembly, the inner cavity of the liquid storage bag communicating with the liquid storage cavity.

[0019] According to an embodiment of the present invention, a battery cell includes a housing, an electrode assembly, and a liquid storage assembly as described in any of the above embodiments. The electrode assembly is disposed within the housing, and the insulating sheet is disposed between the electrode assembly and a first wall of the housing.

[0020] The technical advantages of the battery cell according to the present invention are the same as those of the liquid storage component in the above embodiments, and will not be repeated here.

[0021] In some embodiments, the electrode assembly includes a positive electrode, a negative electrode, and a separator, the separator being disposed between the positive electrode and the negative electrode, a portion of the separator protruding from the positive electrode and the negative electrode on the side facing the first wall and forming a gap around them, the protrusion passing through the gap.

[0022] The battery pack according to the present invention includes battery cells as described in any of the above embodiments.

[0023] The technical advantages of the battery pack according to the present invention are the same as those of the battery cell in the above embodiments, and will not be repeated here.

[0024] The vehicle according to an embodiment of the present invention includes a battery pack as described in the above embodiment.

[0025] The technical advantages of the vehicle according to this utility model embodiment are the same as the technical advantages of the battery pack in the above embodiment, and will not be repeated here. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a liquid storage assembly according to an embodiment of the present utility model.

[0027] Figure 2 This is another schematic diagram of a liquid storage assembly according to an embodiment of the present invention.

[0028] Figure 3 This is another schematic diagram of the liquid storage assembly according to an embodiment of the present utility model.

[0029] Figure 4 This is a partially enlarged cross-sectional view of the liquid storage assembly at the second through hole according to an embodiment of the present utility model.

[0030] Figure 5 This is another schematic diagram of the liquid storage assembly according to an embodiment of the present utility model.

[0031] Figure 6 yes Figure 5 A magnified side view of a portion of the view.

[0032] Figure 7 This is a schematic diagram of the electrode assembly according to an embodiment of the present invention.

[0033] Figure 8 This is an exploded view of a battery cell according to an embodiment of the present invention, wherein the housing is hidden.

[0034] Figure 9This is a schematic diagram of a battery cell according to an embodiment of the present invention.

[0035] Figure label:

[0036] 1. Insulating sheet; 11. Liquid storage chamber; 12. First through hole; 13. Second through hole; 14. Third through hole; 2. Protrusion; 3. Side plate; 31. Liquid storage tank; 4. Electrode assembly; 5. Housing; 6. Explosion-proof valve. Detailed Implementation

[0037] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0038] In related technologies, after the battery cell completes the first liquid injection and wetting, it will undergo a second wetting to improve the wetting efficiency of the positive and negative electrodes in the electrode assembly. However, during the second wetting, the electrolyte does not easily enter the interior of the electrode assembly, and the problem of poor wetting effect still exists.

[0039] To address the aforementioned shortcomings, the following will be combined with... Figures 1-8 A liquid storage assembly according to an embodiment of the present invention is described.

[0040] The liquid storage assembly of this embodiment includes an insulating sheet 1 and a protrusion 2. The insulating sheet 1 is adapted to be disposed between the electrode assembly 4 of the battery cell and the first wall of the housing 5. The insulating sheet 1 has a liquid storage cavity 11 inside. A first through hole 12 and a second through hole 13 are formed on two opposing surfaces of the insulating sheet 1 in the thickness direction, respectively, and the first through hole 12 and the second through hole 13 communicate with the liquid storage cavity 11. The protrusion 2 is disposed on the surface of the insulating sheet 1 and is adapted to extend into the interior of the electrode assembly 4.

[0041] According to the embodiment of the present invention, the electrolyte storage assembly is provided with a storage cavity 11 inside the insulating sheet 1, and a first through hole 12 and a second through hole 13 communicating with the storage cavity 11 are provided on two opposing surfaces of the insulating sheet 1 along its thickness direction. The electrolyte in the housing 5 can be filled into the storage cavity 11, ensuring that the insulating sheet 1 separates the electrode assembly 4 and the first wall of the housing 5 while effectively increasing the electrolyte capacity in the housing 5. At the same time, by providing a protrusion 2 on the upper surface of the insulating sheet 1, the protrusion 2 can extend into the interior of the electrode assembly 4 to open the gap formed by the bottom diaphragm of the electrode assembly 4. Thus, when the electrode assembly 4 expands during charging and discharging and squeezes the insulating sheet 1, the electrolyte in the storage cavity 11 can be pumped through the first through hole 12 or the second through hole 13 to the positive and negative electrode plates inside the electrode assembly 4, effectively avoiding poor wetting of the electrode assembly 4 and resulting in a long service life of the battery cell.

[0042] It should be noted that the outer contour of the cross-section of the protrusion 2 includes, but is not limited to, a circle and a strip. To facilitate the insertion of the protrusion 2 into the gap at the bottom of the electrode assembly 4, it is preferable that the outer contour of the cross-section of the protrusion 2 be a strip with a smaller width. Furthermore, the extending direction of the protrusion 2 is generally parallel to the positive and negative electrode plates in the electrode assembly 4. Figure 1 The insulating sheet 1 is disposed between the bottom wall of the electrode assembly 4 and the housing 5, the first through hole 12 is disposed on the upper surface of the insulating sheet 1, the second through hole 13 is disposed on the lower surface of the insulating sheet 1, and the protrusion 2 is disposed on the upper surface of the insulating sheet 1.

[0043] In some embodiments, such as Figure 1 and Figure 2 As shown, the protrusion 2 is provided correspondingly to the second through hole 13, and the second through hole 13 penetrates the protrusion 2 along the thickness direction of the insulating sheet 1.

[0044] That is, the protrusion 2 is a sleeve-shaped structure. After the protrusion 2 opens the gap formed by the bottom diaphragm of the electrode assembly 4, the electrolyte in the storage chamber 11 can directly enter the innermost part of the opened gap of the electrode assembly 4 through the second through hole 13, thereby better ensuring the wetting effect of the electrolyte on the positive and negative electrode plates inside the electrode assembly 4.

[0045] like Figure 1 , Figure 2 and Figure 4 As shown, the second through hole 13 is a round hole.

[0046] In some embodiments, the area of ​​the outer contour of the cross-section of the protrusion 2 gradually decreases or decreases stepwise in the direction away from the insulating sheet 1.

[0047] This design can effectively reduce the cross-sectional area at the end of the protrusion 2, thereby reducing the difficulty of the protrusion 2 opening the bottom gap of the electrode assembly 4. At this time, the axial dimension of the protrusion 2 can be designed to be larger so that the protrusion 2 can penetrate deeper into the electrode assembly 4, further ensuring the wettability of the electrode assembly 4.

[0048] Specifically, the area of ​​the outer contour of the cross-section of the protrusion 2 gradually decreases from bottom to top.

[0049] Alternatively, the liquid reservoir assembly may also include an injection needle connected to the protrusion 2.

[0050] The protrusion 2 can be a cylindrical structure that facilitates connection with the injection needle. The injection needle can also pump the electrolyte in the reservoir 11 into the electrode assembly 4 to a deeper depth, so as to further ensure the wettability of the electrode assembly 4.

[0051] Specifically, the injection needle is a standard part, which is connected to the protrusion 2 by sleeve or screw.

[0052] In some embodiments, the liquid storage assembly further includes a one-way valve disposed in the second through hole 13, through which the electrolyte in the liquid storage chamber 11 can flow to the protrusion 2.

[0053] That is, the protrusion 2 is a one-way valve, or the one-way valve is connected to the protrusion 2. The above settings ensure that the electrolyte in the storage chamber 11 can only be pumped into the electrode assembly 4, and will not allow the electrolyte wetting the electrode assembly 4 to flow back into the storage chamber 11 through the second through hole 13, thereby further ensuring the reliability of the electrolyte wetting of the electrode assembly 4.

[0054] It should be noted that the one-way valve can be any valve in the related technology that can control unidirectional flow, and its specific structure will not be described here.

[0055] In some embodiments, the number of first through holes 12 is multiple, and an array of multiple first through holes 12 is disposed on the surface of the insulating sheet 1.

[0056] This design, on the one hand, further increases the total volume of the first through hole 12, thereby further increasing the electrolyte capacity inside the housing 5, and on the other hand, more reliably ensures that the electrolyte located below the insulating plate enters the storage chamber 11 through the first through hole 12.

[0057] Specifically, such as Figure 3 As shown, multiple first through holes 12 are arranged in rows and columns evenly on the lower surface of the insulating sheet 1.

[0058] In some embodiments, the number of second through holes 13 is one, and the second through hole 13 is located at the center of the surface of the insulating sheet 1. This arrangement ensures that the electrolyte in the liquid storage cavity 11 can be pumped into the bottom center of the electrode assembly 4, thereby facilitating the diffusion of the electrolyte to the edge of the electrode assembly 4 and resulting in a good wetting effect of the electrolyte on the electrode assembly 4.

[0059] Alternatively, there may be multiple second through holes 13, arranged in an array on the surface of the insulating sheet 1. In this case, the electrolyte in the storage cavity 11 can be pumped into the electrode assembly 4 through the multiple second through holes 13, resulting in higher uniformity of electrolyte pumping into the electrode assembly 4 and better wetting effect on the electrode assembly 4.

[0060] Specifically, such as Figure 2 As shown, the second through hole 13 can be disposed at the center position of the upper surface of the insulating sheet 1 in the width direction, and multiple second through holes 13 are arranged at equal intervals along the length direction of the insulating sheet 1.

[0061] In some embodiments, an explosion-proof valve 6 is provided on the bottom wall of the housing 5, and thinning grooves are provided on the upper and lower surfaces of the area of ​​the insulating sheet 1 that overlaps with the explosion-proof valve 6 in the thickness direction of the insulating sheet 1, and / or, a protrusion 2 is provided on the upper surface of the area of ​​the insulating sheet 1 that overlaps with the explosion-proof valve 6 in the thickness direction of the insulating sheet 1.

[0062] In other words, when the battery cell is an inverted battery with the electrodes and the explosion-proof valve 6 reversed, the area of ​​the insulating sheet 1 opposite to the explosion-proof valve 6 is thinned or a protrusion 2 is provided to effectively reduce its structural strength. In the event of thermal runaway of the battery cell, the part of the insulating sheet 1 opposite to the explosion-proof valve 6 can break and be discharged from the battery cell through the through hole at the explosion-proof valve 6, effectively ensuring the explosion-proof reliability of the battery cell.

[0063] It should be noted that when a battery cell experiences thermal runaway, the heat flow will simultaneously impact the protrusion 2 and the insulating sheet 1. Consequently, the location of the insulating sheet 1 with the protrusion 2 is also subjected to the impact from the protrusion 2, making it more prone to breakage and fragmentation compared to other areas.

[0064] In some embodiments, such as Figure 5 As shown, the liquid storage assembly also includes a side plate 3, which is adapted to be disposed between the side wall of the housing 5 and the electrode assembly 4. The side plate 3 is connected to the insulating sheet 1. The side of the side plate 3 facing the side wall of the housing 5 is provided with a liquid storage groove 31 extending along the thickness direction of the insulating sheet 1. The liquid storage groove 31 is connected to the liquid storage cavity 11.

[0065] The electrolyte storage tank 31 serves two purposes: firstly, it can accommodate the electrolyte located between the side wall of the housing 5 and the electrode assembly 4, ensuring the electrolyte capacity within the housing 5; secondly, it ensures that the electrolyte in the storage tank 31 can automatically flow into the storage cavity 11 under gravity, effectively improving the utilization rate of the electrolyte located between the side wall of the housing 5 and the electrode assembly 4.

[0066] Specifically, such as Figure 6 As shown, the liquid storage tank 31 extends through the side plate 3 along its thickness direction. The lower end of the side plate 3 is connected to the side wall of the insulating sheet 1 facing the housing 5. The side of the insulating sheet 1 is provided with a third through hole 14 connecting the liquid storage cavity 11 and the liquid storage tank 31. This arrangement further increases the electrolyte capacity inside the housing 5 while further reducing the difficulty of electrolyte flowing from the liquid storage tank 31 into the liquid storage cavity 11.

[0067] It should be noted that the side plate 3 can extend along the circumference of the insulating plate and be connected end to end. The side plate 3 preferably fills all the gaps between the side wall of the housing 5 and the electrode assembly 4. At this time, on the projection plane perpendicular to the height direction of the battery cell, the projection of the insulating sheet 1 coincides with the projection of the inner cavity of the housing 5. At this time, when the electrode assembly 4 expands during charging and discharging, it can better squeeze the liquid storage space and is more conducive to pumping out more free electrolyte.

[0068] In some embodiments, the liquid storage assembly further includes a liquid storage bag, which is connected to the insulating sheet 1 and adapted to wrap the outer peripheral surface of the electrode assembly 4, and the inner cavity of the liquid storage bag is in communication with the liquid storage cavity 11.

[0069] At this time, the liquid storage bag can replace the insulating film to cover the electrode assembly 4 and complete the liquid storage function. Furthermore, by setting the liquid storage bag to communicate with the liquid storage cavity 11 on the insulating sheet 1, the utilization rate of the electrolyte between the side wall of the housing 5 and the electrode assembly 4 is effectively improved.

[0070] According to an embodiment of the present invention, a battery cell includes a housing 5, an electrode assembly 4, and a liquid storage assembly as described in any of the above embodiments. The electrode assembly 4 is disposed inside the housing 5, and an insulating sheet 1 is disposed between the electrode assembly 4 and the first wall of the housing 5.

[0071] The technical advantages of the battery cell according to the present invention are the same as those of the liquid storage component in the above embodiments, and will not be repeated here.

[0072] In some embodiments, the electrode assembly 4 includes a positive electrode, a negative electrode, and a separator. The separator is disposed between the positive electrode and the negative electrode. A portion of the separator protrudes from the positive electrode and the negative electrode on the side facing the first wall and surrounds them to form a gap. The protrusion 2 passes through the gap.

[0073] That is, the extension direction of the protrusion 2 is parallel to the positive and negative electrode plates, which makes it easier for the electrolyte in the storage cavity 11 to enter the gap between the positive and negative electrode plates through the protrusion 2, resulting in better secondary wetting effect of the electrode assembly 4 and longer service life of the battery cell.

[0074] For example, the insulating sheet 1 is located between the electrode assembly 4 and the bottom wall of the housing 5, as shown below. Figure 9 As shown, when the outer contour of the battery cell is rectangular, the positive electrode, separator, and negative electrode are stacked. When the outer contour of the battery cell is cylindrical, the positive electrode, separator, and negative electrode are wound together.

[0075] The battery pack according to the present invention includes battery cells as described in any of the above embodiments.

[0076] The technical advantages of the battery pack according to the present invention are the same as those of the battery cell in the above embodiments, and will not be repeated here.

[0077] The vehicle according to an embodiment of the present invention includes a battery pack as described in the above embodiment.

[0078] The technical advantages of the vehicle according to this utility model embodiment are the same as the technical advantages of the battery pack in the above embodiment, and will not be repeated here.

[0079] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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.

[0080] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0081] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0082] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0083] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0084] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A liquid storage assembly for a battery cell, characterized in that, include: An insulating sheet is provided, which is adapted to be disposed between the electrode assembly of the battery cell and the first wall of the housing. The insulating sheet has a liquid storage cavity, and a first through hole and a second through hole are formed on two opposing surfaces of the insulating sheet in the thickness direction, respectively. The first through hole and the second through hole communicate with the liquid storage cavity. A protrusion is disposed on the surface of the insulating sheet and is adapted to extend into the interior of the electrode assembly.

2. The liquid storage assembly according to claim 1, characterized in that, The protrusion is correspondingly provided with the second through hole, and the second through hole extends through the protrusion along the thickness direction of the insulating sheet.

3. The liquid storage assembly according to claim 2, characterized in that, The area of ​​the outer contour of the cross-section of the protrusion gradually decreases or decreases in a stepwise manner in the direction away from the insulating sheet; Alternatively, the liquid reservoir assembly may further include an injection needle connected to the protrusion.

4. The liquid storage assembly according to claim 1, characterized in that, The liquid storage assembly also includes a one-way valve, which is disposed in the second through hole, allowing the electrolyte in the liquid storage chamber to flow to the protrusion through the one-way valve.

5. The liquid storage assembly according to claim 1, characterized in that, The number of the first through holes is multiple, and an array of the multiple first through holes is disposed on the surface of the insulating sheet.

6. The liquid storage assembly according to claim 1, characterized in that, The number of the second through holes is one, and the second through hole is located at the center of the surface of the insulating sheet; Alternatively, there may be multiple second through holes, and an array of multiple second through holes may be arranged on the surface of the insulating sheet.

7. The liquid storage assembly according to claim 1, characterized in that, An explosion-proof valve is provided on the bottom wall of the housing. Thinning grooves are provided on the upper and lower surfaces of the area of ​​the insulating sheet that overlaps with the explosion-proof valve in the thickness direction of the insulating sheet. And / or, the protrusion is provided on the upper surface of the area of ​​the insulating sheet that overlaps with the explosion-proof valve in the thickness direction of the insulating sheet.

8. The liquid storage assembly according to any one of claims 1-7, characterized in that, The liquid storage assembly further includes a side plate, which is adapted to be disposed between the side wall of the housing and the electrode assembly. The side plate is connected to the insulating sheet, and the side of the side plate facing the side wall of the housing has a liquid storage groove extending along the thickness direction of the insulating sheet. The liquid storage groove is in communication with the liquid storage cavity.

9. The liquid storage assembly according to claim 8, characterized in that, The liquid storage tank extends through the side plate along the thickness direction of the side plate. The lower end of the side plate is connected to the side of the insulating sheet facing the side wall of the housing. The side of the insulating sheet is provided with a third through hole that connects the liquid storage cavity and the liquid storage tank.

10. The liquid storage assembly according to any one of claims 1-7, characterized in that, The liquid storage assembly also includes a liquid storage bag, which is connected to the insulating sheet and adapted to wrap the outer peripheral surface of the electrode assembly. The inner cavity of the liquid storage bag is in communication with the liquid storage cavity.

11. A single battery cell, characterized in that, It includes a housing, an electrode assembly, and a liquid storage assembly according to any one of claims 1-10, wherein the electrode assembly is disposed within the housing, and the insulating sheet is disposed between the electrode assembly and a first wall of the housing.

12. The battery cell according to claim 11, characterized in that, The electrode assembly includes a positive electrode, a negative electrode, and a separator. The separator is disposed between the positive electrode and the negative electrode. A portion of the separator protrudes from the positive electrode and the negative electrode on the side facing the first wall and forms a gap around them. The protrusion passes through the gap.

13. A battery pack, characterized in that, Includes the battery cell according to claim 11 or 12.

14. A vehicle, characterized in that, Includes the battery pack according to claim 13.

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