Lower plastic part, top cover assembly, energy storage device and electric appliance

Abstract

The application discloses a lower plastic part, a top cover assembly, an energy storage device and an electric equipment. The lower plastic part comprises a first surface and a second surface opposite to each other, and is provided with a first liquid injection hole penetrating through the first surface and the second surface. The first surface is provided with a shunt rib. The shunt rib is located at the edge of the first liquid injection hole. The shunt rib comprises a first shunt section and a second shunt section connected at an angle. A bending part is formed at the connection of the first shunt section and the second shunt section. The bending part is arranged close to the first liquid injection hole. The first shunt section and the second shunt section are used for shunting part of electrolyte injected through the first liquid injection hole to different positions of the bare battery cell. The lower plastic part, the top cover assembly, the energy storage device and the electric equipment disclosed by the application can reduce the probability of damage to the bare battery cell caused by direct impact of the electrolyte on the bare battery cell. Meanwhile, the application can improve the absorption efficiency of the bare battery cell to the electrolyte and shorten the soaking time.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to a lower plastic part, a top cover assembly, an energy storage device, and an electrical appliance. Background Technology

[0002] Typically, a battery consists of a casing, bare cells, and end caps. The bare cells are housed within the casing, and the end caps are positioned over the openings of the casing to seal the internal space. To prevent the bare cells from directly contacting the end caps or casing and causing the casing to become charged, a lower plastic component is usually placed between the end caps and the bare cells. Furthermore, to facilitate the injection of electrolyte into the casing, both the end caps and the lower plastic component have through-holes for electrolyte to be injected into the casing and wet the bare cells.

[0003] However, in related technologies, during the electrolyte injection process, the electrolyte is directly sprayed onto the bare cell through the injection hole. This can cause some damage to the bare cell. In order to avoid other structures, the injection hole is usually offset from the center of the bare cell, which can easily cause the electrolyte to be concentrated and injected to one side of the bare cell. As a result, the electrolyte first wets the part of the bare cell close to the injection hole, and then slowly wets the part of the bare cell away from the injection hole. This can easily lead to uneven absorption of electrolyte by the bare cell and cause the wetting time to be too long. Summary of the Invention

[0004] This invention discloses a lower plastic part, a top cover assembly, an energy storage device, and an electrical device, which can reduce the probability of damage to the bare battery cell caused by direct impact of electrolyte on the bare battery cell, and at the same time improve the absorption efficiency of the bare battery cell to electrolyte and shorten the immersion time.

[0005] To achieve the above objectives, in a first aspect, the present invention discloses a lower plastic component, the lower plastic component including a first surface and a second surface facing away from each other, and the lower plastic component having a first injection hole penetrating the first surface and the second surface, the first surface having a diversion rib protruding therefrom, the diversion rib being located at the edge of the first injection hole, and the diversion rib including a first diversion segment and a second diversion segment connected at an angle, the connection between the first diversion segment and the second diversion segment having a bent portion formed therein, the bent portion being disposed close to the first injection hole, so that the first diversion segment and the second diversion segment can be used to divert a portion of the electrolyte injected through the first injection hole to different positions of the bare battery cell.

[0006] In the lower plastic part provided in this application, by additionally adding diversion ribs to the lower plastic part and designing the diversion ribs as a diversion structure including a first diversion section and a second diversion section connected at an angle, a portion of the electrolyte injected through the first injection hole is diverted to different positions of the bare battery cell using the first and second diversion sections. This increases the area where the electrolyte falls onto the bare battery cell, thereby improving the absorption efficiency of the bare battery cell by the electrolyte, shortening the wetting time of the bare battery cell, and improving the wetting efficiency of the bare battery cell. At the same time, since the electrolyte injected through the first injection hole can flow along the first and second diversion sections before falling onto the bare battery cell, that is, the electrolyte can flow indirectly to the bare battery cell through the first and second diversion sections, this can avoid the electrolyte directly impacting the bare battery cell, thereby reducing the probability of damage to the bare battery cell caused by direct impact of the electrolyte.

[0007] As an optional implementation, in an embodiment of the first aspect of the present invention, the first diversion section extends in a straight line or arc from the connection with the bend in a direction away from the first injection hole; and / or, the second diversion section extends in a straight line or arc from the connection with the bend in a direction away from the first injection hole.

[0008] This design guides the electrolyte injected through the first injection hole to a position on the bare battery cell away from the first injection hole, increasing the area where the electrolyte falls onto the bare battery cell. This improves the absorption efficiency of the electrolyte by the bare battery cell, shortens the wetting time, and increases the wetting efficiency. Preferably, the first diversion section extends in an arc from its connection with the bend in a direction away from the first injection hole; simultaneously, the second diversion section also extends in an arc from its connection with the bend in a direction away from the first injection hole. The arc-shaped diversion section causes the electrolyte to move at a non-uniform speed in the first and second diversion sections. In the direction of electrolyte flow, the electrolyte at the rear has a greater speed, which can impact the electrolyte at the front, causing the electrolyte to fly further. This further disperses and guides the electrolyte, allowing it to drip evenly onto various positions on the bare battery cell, facilitating more uniform and rapid wetting of the bare battery cell, accelerating the wetting time, and improving the wetting efficiency.

[0009] As an optional implementation, in an embodiment of the first aspect of the present invention, the height of the first diversion section protruding relative to the first surface gradually decreases from the connection point of the first diversion section and the bending portion in a direction away from the first injection hole; and / or, the height of the second diversion section protruding relative to the first surface gradually decreases from the connection point of the second diversion section and the bending portion in a direction away from the first injection hole.

[0010] This design results in a relatively high protrusion of the bent portion relative to the first surface. The electrolyte injected through the first injection hole first contacts the bent portion of the diverting rib. By setting the relatively high protrusion of the bent portion relative to the first surface, the higher position of the diverting rib (i.e., the bent portion) is positioned close to the first injection hole, ensuring a large contact area between the electrolyte and the diverting rib. This allows more electrolyte to flow along the first and second diverting sections, facilitating the diversion of electrolyte at the first injection hole. Simultaneously, because some electrolyte drips from the first and second diverting sections onto the bare battery cell during flow, less electrolyte reaches the ends of the first and second diverting sections furthest from the first injection hole. The protrusion height of both the first and second diverting sections relative to the first surface originates from the bent portion. The electrolyte gradually decreases in the direction away from the first injection hole, allowing it to smoothly drip from the ends of the first and second shunt sections away from the first injection hole onto the bare cell. This not only ensures the shunt function but also reduces costs. On the other hand, due to surface tension, if the height of the first and second shunt sections relative to the first surface remains the same in the direction away from the first injection hole, or if it gradually increases from the bend in the direction away from the first injection hole, some electrolyte will adhere to the sidewalls of the first and second shunt sections, resulting in electrolyte waste. Furthermore, most of the electrolyte will flow along the path formed by the first and second shunt sections towards the ends of the first and second shunt sections away from the first injection hole, which is not conducive to the uniform dripping of electrolyte onto the bare cell.

[0011] As an optional implementation, in an embodiment of the first aspect of the present invention, there are multiple diversion ribs, and the multiple diversion ribs are distributed at intervals along the circumference of the first injection hole at the edge of the first injection hole.

[0012] By setting multiple flow-diverting ribs, at least four flow paths can be provided for the electrolyte, thus dispersing the electrolyte flow into at least four paths. This allows the electrolyte to be dispersed and guided to more different locations on the bare battery cell along the paths formed by the multiple flow-diverting ribs. This not only further increases the area where the electrolyte falls onto the bare battery cell, thereby improving the absorption efficiency of the bare battery cell by the electrolyte, but also shortens the wetting time and improves the wetting efficiency of the bare battery cell. At the same time, since the electrolyte can be dispersed and discharged through at least four flow paths, this helps to reduce the probability of damage to the bare battery cell caused by the impact of the electrolyte on the bare battery cell, and improves the wetting effect of the bare battery cell.

[0013] As an optional implementation, in an embodiment of the first aspect of the present invention, any two adjacent diversion ribs are respectively a first sub-diversion rib and a second sub-diversion rib. The first diversion segment of the first sub-diversion rib is arranged close to the second diversion segment of the second sub-diversion rib, and the first diversion segment of the first sub-diversion rib and the second diversion segment of the second sub-diversion rib are arranged parallel to each other. That is, the diversion segments of two adjacent separation ribs that are close to each other are arranged parallel to each other, so that the distance between the diversion segments of two adjacent separation ribs that are close to each other remains consistent along the direction away from the first injection hole. This is beneficial to enable the electrolyte to flow uniformly and stably to a position far from the first injection hole, and to better disperse and guide the electrolyte to drip onto various positions of the bare cell, so as to facilitate faster wetting of the bare cell, accelerate the wetting time, and improve the wetting efficiency.

[0014] As an optional implementation, in an embodiment of the first aspect of the present invention, the center of the first injection hole and the center of the lower plastic part are eccentrically disposed, and the diversion rib includes a first diversion rib and a second diversion rib, the first diversion rib being located on the side of the first injection hole closer to the center of the lower plastic part, and the second diversion rib being located on the side of the first injection hole away from the center of the lower plastic part; the length of the first diversion segment of the first diversion rib is greater than the length of the first diversion segment of the second diversion rib, and / or, the length of the second diversion segment of the first diversion rib is greater than the length of the second diversion segment of the second diversion rib.

[0015] Since the first injection hole is offset from the center of the lower plastic part, it is also offset from the center of the bare battery cell. By making the length of the first branching section of the first branching rib greater than the length of the first branching section of the second branching rib, and by making the length of the second branching section of the first branching rib greater than the length of the second branching section of the second branching rib, the electrolyte injected from the first injection hole can flow more towards the center of the lower plastic part. This ensures that the electrolyte can flow to a position farther away from the first injection hole, thereby allowing the electrolyte to flow to the center of the bare battery cell and to a position farther away from the first injection hole. This makes the area where the electrolyte falls on the bare battery cell more balanced, improving the absorption efficiency and uniformity of the electrolyte by the bare battery cell.

[0016] As an optional implementation, in an embodiment of the first aspect of the present invention, the center of the first injection hole and the center of the lower plastic part are connected to form a center line. The first and second diversion segments of the first diversion rib are symmetrical about the center line, and the first and second diversion segments of the second diversion rib are also symmetrical about the center line. This allows the lengths of the first and second diversion segments of the first and second diversion ribs to remain equal, enabling the electrolyte to be dispersed and evenly guided to both sides of the center line. This allows the electrolyte to be better dispersed and evenly dripped onto various positions of the bare battery cell, facilitating more uniform and rapid wetting of the bare battery cell.

[0017] As an optional implementation, in an embodiment of the first aspect of the present invention, the diversion rib further includes a third diversion rib and a fourth diversion rib, the third diversion rib and the fourth diversion rib being located on both sides of the center line, the first diversion segment of the third diversion rib being disposed close to the first diversion rib, the second diversion segment of the third diversion rib being disposed close to the second diversion rib, the first diversion segment of the fourth diversion rib being disposed close to the second diversion rib, and the second diversion segment of the fourth diversion rib being disposed close to the first diversion rib; wherein, the length of the first diversion segment of the third diversion rib is greater than the length of the second diversion segment of the third diversion rib, and the length of the first diversion segment of the fourth diversion rib is less than the length of the second diversion segment of the fourth diversion rib.

[0018] Because the first injection hole is offset from the center of the lower plastic part, it is also offset from the center of the bare battery cell. Furthermore, the first branching section of the third branching rib is closer to the first injection hole than the second branching section of the third branching rib, and the second branching section of the fourth branching rib is closer to the first injection hole than the first branching section of the fourth branching rib. By making the length of the first branching section of the third branching rib greater than the length of the second branching section of the third branching rib, and making the length of the first branching section of the fourth branching rib less than the length of the second branching section of the fourth branching rib, the electrolyte injected from the first injection hole can flow more towards the center of the lower plastic part. This ensures that the electrolyte can flow to a position farther from the first injection hole, resulting in a more balanced distribution of electrolyte in the bare battery cell area and improving the absorption efficiency and uniformity of the electrolyte by the bare battery cell.

[0019] As an optional implementation, in an embodiment of the first aspect of the present invention, the distance between the second diversion segment of the first diversion rib and the first diversion segment of the third diversion rib is greater than the distance between the first diversion segment of the second diversion rib and the second diversion segment of the third diversion rib; the distance between the first diversion segment of the first diversion rib and the second diversion segment of the fourth diversion rib is greater than the distance between the second diversion segment of the second diversion rib and the first diversion segment of the fourth diversion rib.

[0020] The above configuration allows for a wider electrolyte flow path closer to the center of the lower plastic part. This increases the electrolyte flow rate, enabling the electrolyte injected from the first injection hole to flow more towards the center of the lower plastic part. This ensures that the electrolyte can flow to a location further away from the first injection hole, resulting in a more balanced distribution of electrolyte across the bare battery cell area. This accelerates the wetting time and improves the absorption efficiency and uniformity of the electrolyte by the bare battery cell.

[0021] As an optional implementation, in an embodiment of the first aspect of the present invention, the first included angle between the first and second branch sections of the first branching rib is α1, the second included angle between the first and second branch sections of the second branching rib is α2, the third included angle between the first and second branch sections of the third branching rib is α3, and the fourth included angle between the first and second branch sections of the fourth branching rib is α4, wherein α4 < α3 = α2 < α1. This allows the electrolyte to flow more towards the center of the lower plastic part and also towards the edge of the lower plastic part away from the first injection hole, ensuring that the electrolyte can flow to the edge of the lower plastic part farther from the first injection hole. This results in a more balanced distribution of the electrolyte in the bare cell area, accelerating the wetting time and improving the absorption efficiency and uniformity of the electrolyte by the bare cell.

[0022] As an optional implementation, in an embodiment of the first aspect of the present invention, the lower plastic part is circular in shape, and an arc-shaped support fence is provided at the edge of the first surface; the maximum height of the diversion rib protruding relative to the first surface is less than the height of the arc-shaped support fence protruding relative to the first surface.

[0023] If the height of the diversion rib protruding from the relative first surface is equal to or even greater than the height of the arc-shaped support fence protruding from the relative first surface, it not only increases cost and occupies more space, but also creates a barrier between the first and second diversion sections when the manifold cover is placed on top of the arc-shaped support fence. This affects air permeability and makes it difficult to open the explosion-proof valve, potentially leading to safety hazards. Therefore, the above design avoids excessively high protrusions of the diversion rib from the relative first surface, preventing the formation of a barrier between the first and second diversion sections when the manifold cover is placed on top of the arc-shaped support fence. This ensures smooth pressure relief and explosion protection through the explosion-proof valve, improving safety while reducing costs and enabling miniaturized design of the lower plastic parts.

[0024] As an optional implementation, in an embodiment of the first aspect of the present invention, the lower plastic part is square in shape, with an explosion-proof valve grille protruding from the center of the first surface, and a groove penetrating the explosion-proof valve grille in the center of the grille; in the direction in which the diverting ribs protrude relative to the first surface, the ends of the first diverting section and the second diverting section furthest from the first injection hole are both higher than or flush with the bottom surface of the groove. This ensures that the electrolyte can pass through the groove in the center of the explosion-proof valve grille and flow to a position on the lower plastic part farther from the first injection hole, so that the electrolyte can fall to a position on the bare battery cell farther from the first injection hole, thereby allowing the electrolyte to be dispersed and evenly dripped to various positions on the bare battery cell, facilitating more uniform and rapid wetting of the bare battery cell.

[0025] Secondly, the present invention discloses a top cover assembly, which includes a top cover plate and a lower plastic component as described in the first aspect above. The lower plastic component is connected to the top cover plate, and the diversion rib is located on the side of the lower plastic component opposite to the top cover plate. The top cover plate is provided with a second injection hole communicating with the first injection hole. The top cover assembly having the lower plastic component described in the first aspect can reduce the probability of damage to the bare battery cell caused by direct impact of electrolyte, while also improving the absorption efficiency of the bare battery cell to the electrolyte and shortening the immersion time.

[0026] Thirdly, the present invention discloses an energy storage device comprising a housing, a bare battery cell, and a top cover assembly as described in the second aspect above. The housing has an opening, the bare battery cell is housed within the housing, the top cover plate is sealed to the opening, and the lower plastic component is disposed facing the bare battery cell. Because the top cover assembly described in the second aspect possesses the beneficial effects of the lower plastic component described in the first aspect, the energy storage device disclosed in the third aspect of the present invention can reduce the probability of damage to the bare battery cell caused by direct impact of electrolyte on the bare battery cell, while also improving the absorption efficiency of the bare battery cell to the electrolyte and shortening the immersion time.

[0027] Fourthly, the present invention discloses an electrical device comprising the energy storage device described in the third aspect above. Because the energy storage device described in the third aspect possesses the beneficial effects of the lower plastic part described in the first aspect, the electrical device disclosed in the fourth aspect of the present invention can reduce the probability of damage to the bare battery cell caused by direct impact of electrolyte on the bare battery cell, and can also improve the absorption efficiency of the bare battery cell to the electrolyte and shorten the immersion time.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] The lower plastic component, top cover assembly, energy storage device, and electrical equipment provided in this invention embodiment, by additionally adding diversion ribs to the lower plastic component and designing the diversion ribs as a diversion structure including a first diversion section and a second diversion section connected at an angle, can utilize the first and second diversion sections to divert a portion of the electrolyte injected through the first injection hole to different positions of the bare battery cell. That is, the electrolyte can be guided along the extending direction of the first and second diversion sections to different positions above the corresponding bare battery cell, thereby dripping to different positions of the bare battery cell below. This increases the area where the electrolyte falls onto the bare battery cell, thereby improving the absorption efficiency of the electrolyte by the bare battery cell, shortening the immersion time, and increasing the immersion efficiency. At the same time, since some of the electrolyte injected through the first injection hole can first flow along the first and second diversion sections before falling onto the bare battery cell, that is, the electrolyte can flow indirectly to the bare battery cell through the first and second diversion sections, this can avoid the electrolyte directly impacting the bare battery cell, thereby reducing the probability of damage to the bare battery cell caused by direct impact of the electrolyte. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a three-dimensional structural diagram of the circular lower plastic part disclosed in an embodiment of the present invention;

[0032] Figure 2 This is a top view of the circular lower plastic part disclosed in an embodiment of the present invention;

[0033] Figure 3 yes Figure 2 A three-dimensional sectional view of the circular lower plastic part along the AA direction;

[0034] Figure 4 yes Figure 2 A cross-sectional view of the circular lower plastic part along the BB direction;

[0035] Figure 5 This is a top view of the lower plastic part when the first and second flow-dividing sections disclosed in the embodiments of the present invention are arc-shaped flow-dividing sections;

[0036] Figure 6 This is a three-dimensional structural diagram of the square lower plastic part disclosed in an embodiment of the present invention;

[0037] Figure 7 This is a top view of the square lower plastic part disclosed in an embodiment of the present invention;

[0038] Figure 8 yes Figure 7 A cross-sectional view of the square lower plastic part along the CC direction;

[0039] Figure 9 This is an exploded structural diagram of the top cover assembly disclosed in an embodiment of the present invention;

[0040] Figure 10 This is an exploded structural diagram of the top cover assembly disclosed in an embodiment of the present invention from another perspective;

[0041] Figure 11 This is an exploded structural diagram of the energy storage device disclosed in an embodiment of the present invention.

[0042] Explanation of main figure symbols

[0043] 10-Lower plastic part; 10a-First surface; 10b-Second surface; 11-First injection hole; 12-Diverter rib; 12a-First diverter rib; 12b-Second diverter rib; 12c-Third diverter rib; 12d-Fourth diverter rib; 121-First diverter section; 122-Second diverter section; 123-Bending part; 13-Arc-shaped support fence; 14-Explosion-proof valve fence; 141-Groove; 1411-Groove bottom surface;

[0044] O1 - Center line; α1 - First included angle; α2 - Second included angle; α3 - Third included angle; α4 - Fourth included angle;

[0045] 20 - Top cover assembly; 21 - Top cover plate; 211 - Second injection hole;

[0046] 30 - Energy storage device; 31 - Housing; 311 - Opening; 32 - Bare cell. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0049] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0050] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0051] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0052] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0053] Please see Figures 1 to 4 This invention discloses a lower plastic component 10, which can be applied to the top cover assembly of an energy storage device. The lower plastic component 10 includes a first surface 10a and a second surface 10b facing away from each other, and the lower plastic component 10 has a first injection hole 11 penetrating the first surface 10a and the second surface 10b. The first surface 10a has a protruding diversion rib 12, which is located at the edge of the first injection hole 11. The diversion rib 12 includes a first diversion section 121 and a second diversion section 122 connected at an angle. For example, the diversion rib 12 is bent to form the first diversion section 121 and the second diversion section 122. A bend 123 is formed at the connection between the first diversion section 121 and the second diversion section 122. The bend 123 is located near the first injection hole 11 so that the first diversion section 121 and the second diversion section 122 can be used to divert part of the electrolyte injected through the first injection hole 11 to different positions of the bare cell. That is, during electrolyte injection, part of the electrolyte injected through the first injection hole 11 can flow along the path formed by the first diversion section 121 and the second diversion section 122, and can be thrown from the ends of the first diversion section 121 and the second diversion section 122 away from the first injection hole 11 to different positions of the bare cell.

[0054] In the lower plastic part 10 provided in this application, by additionally adding a diversion rib 12 to the lower plastic part 10, and designing the diversion rib 12 as a diversion structure including a first diversion section 121 and a second diversion section 122 connected at an angle, the first diversion section 121 and the second diversion section 122 are used to divert part of the electrolyte injected through the first injection hole 11 to different positions of the bare battery cell, increasing the area where the electrolyte falls onto the bare battery cell, thereby improving the absorption efficiency of the bare battery cell by the electrolyte, shortening the wetting time of the bare battery cell, and improving the wetting efficiency of the bare battery cell; at the same time, since part of the electrolyte injected through the first injection hole 11 can flow along the first diversion section 121 and the second diversion section 122 and then fall onto the bare battery cell, that is, the electrolyte can flow indirectly to the bare battery cell through the first diversion section 121 and the second diversion section 122, this can avoid the electrolyte directly impacting the bare battery cell, thereby reducing the probability of damage to the bare battery cell caused by the electrolyte directly impacting the bare battery cell.

[0055] In some embodiments, the center of the first injection hole 11 and the center of the lower plastic part 10 are typically eccentrically positioned, that is, the center of the first injection hole 11 and the center of the lower plastic part 10 are not eccentrically positioned to avoid other structures. For example, when the lower plastic part 10 is applied to the top cover assembly of a cylindrical battery, since the mounting position of the terminal post is usually located at the geometric center of the top cover plate and the lower plastic part 10, the first injection hole 11 is usually located on either side of the mounting position of the terminal post to avoid the mounting position of the terminal post; while when the lower plastic part 10 is applied to the top cover assembly of a square battery, since the mounting position of the explosion-proof valve is usually located at the geometric center of the top cover plate and the lower plastic part 10, the first injection hole 11 is usually located on either side of the mounting position of the explosion-proof valve to avoid the mounting position of the explosion-proof valve.

[0056] In some embodiments, the first diversion section 121 may extend linearly from the connection with the bend 123 in a direction away from the first injection hole 11 (e.g., Figure 1 and Figure 2 (as shown) or curved extension (e.g.) Figure 5 (as shown); or, the second diversion section 122 may extend linearly from the connection with the bend 123 in a direction away from the first injection hole 11 (e.g. Figure 1 and Figure 2 (as shown) or curved extension (e.g.) Figure 5(As shown); Alternatively, the first diversion section 121 can extend in a straight line or arc from its connection with the bending portion 123 in a direction away from the first injection hole 11; at the same time, the second diversion section 122 can also extend in a straight line or arc from its connection with the bending portion 123 in a direction away from the first injection hole 11. This allows the electrolyte injected through the first injection hole 11 to be guided to a position on the bare cell away from the first injection hole 11, which facilitates increasing the area where the electrolyte falls onto the bare cell, thereby improving the absorption efficiency of the bare cell by the electrolyte, shortening the wetting time of the bare cell, and improving the wetting efficiency of the bare cell.

[0057] like Figure 5 As shown, the first diversion section 121 extends in an arc from its connection with the bending portion 123 in a direction away from the first injection hole 11; simultaneously, the second diversion section 122 also extends in an arc from its connection with the bending portion 123 in a direction away from the first injection hole 11. That is, both the first diversion section 121 and the second diversion section 122 are arc-shaped diversion sections. The arc-shaped diversion section design allows the electrolyte to move at a non-uniform speed in the first diversion section 121 and the second diversion section 122. In the direction of electrolyte flow, the electrolyte at the rear has a greater speed, which can impact the electrolyte at the front, causing the electrolyte to fly further. This further improves the dispersion and guidance of the electrolyte and allows it to drip evenly to various positions of the bare battery cell, facilitating more uniform and rapid wetting of the bare battery cell, accelerating the wetting time, and improving the wetting efficiency.

[0058] In some embodiments, such as Figure 3 As shown, the height of the first diversion section 121 protruding relative to the first surface 10a can gradually decrease from the connection point of the first diversion section 121 and the bending portion 123 in a direction away from the first injection hole 11; or, the height of the second diversion section 122 protruding relative to the first surface 10a can gradually decrease from the connection point of the second diversion section 122 and the bending portion 123 in a direction away from the first injection hole 11; or, the height of the first diversion section 121 protruding relative to the first surface 10a can gradually decrease from the connection point of the first diversion section 121 and the bending portion 123 in a direction away from the first injection hole 11, and at the same time, the height of the second diversion section 122 protruding relative to the first surface 10a can also gradually decrease from the connection point of the second diversion section 122 and the bending portion 123 in a direction away from the first injection hole 11.

[0059] Preferably, the height of the first diversion section 121 protruding relative to the first surface 10a gradually decreases from the connection point of the first diversion section 121 and the bent portion 123 in a direction away from the first injection hole 11. Simultaneously, the height of the second diversion section 122 protruding relative to the first surface 10a also gradually decreases from the connection point of the second diversion section 122 and the bent portion 123 in a direction away from the first injection hole 11. This results in the bent portion 123 protruding relatively high relative to the first surface 10a. The electrolyte injected into the injection hole 11 first contacts the bent portion 123 of the diversion rib 12. By setting the height of the bent portion 123 protruding relative to the first surface 10a to be relatively high, the higher position of the diversion rib 12 (i.e. the bent portion 123) is set close to the first injection hole 11, which can ensure the contact area between the electrolyte and the diversion rib 12, allowing more electrolyte to flow along the first diversion section 121 and the second diversion section 122, which facilitates the diversion of the electrolyte at the position of the first injection hole 11.

[0060] Simultaneously, as the electrolyte flows, some electrolyte drips from the first diversion section 121 and the second diversion section 122 onto the bare cell, resulting in less electrolyte flowing to the ends of the first diversion sections 121 and 122 furthest from the first injection hole 11. The protrusion height of the first diversion sections 121 and 122 relative to the first surface 10a gradually decreases from the bending portion 123 in the direction away from the first injection hole 11. This allows the electrolyte to smoothly flow from the ends of the first diversion sections 121 and 122 furthest from the first injection hole 11 onto the bare cell. This not only ensures the diversion function and reduces costs, but also improves the electrolyte's performance. Due to surface tension, if the height of the first diversion section 121 and the second diversion section 122 protruding relative to the first surface 10a remains the same along the direction away from the first injection hole 11, or if the height gradually increases from the bending portion 123 along the direction away from the first injection hole 11, a portion of the electrolyte will adhere to the sidewalls of the first diversion section 121 and the second diversion section 122, resulting in electrolyte waste. Furthermore, most of the electrolyte will flow along the path formed by the first diversion section 121 and the second diversion section 122 towards the ends of the first diversion section 121 and the second diversion section 122 away from the first injection hole 11, which is not conducive to the uniform dripping of the electrolyte onto the bare battery cell.

[0061] In some embodiments, there can be multiple diversion ribs 12, such as two, three, four, five, or more, distributed circumferentially at intervals along the edge of the first injection hole 11. By providing multiple diversion ribs 12, at least four flow paths can be provided for the electrolyte, thus dispersing the electrolyte flow path into at least four paths. This allows the electrolyte to be dispersed and guided to more different locations on the bare battery cell along the paths formed by the multiple diversion ribs 12. This not only further increases the area where the electrolyte falls onto the bare battery cell, thereby improving the absorption efficiency of the bare battery cell by the electrolyte, shortening the wetting time of the bare battery cell, and further improving the wetting efficiency of the bare battery cell; but also, since the electrolyte can be dispersed and discharged through at least four flow paths, this helps to reduce the probability of damage to the bare battery cell caused by the impact of the electrolyte on the bare battery cell, and improves the wetting effect of the bare battery cell.

[0062] For ease of description, any two adjacent diversion ribs 12 are defined as the first sub-diversion rib and the second sub-diversion rib, respectively. The diversion segment of the first sub-diversion rib located near the second sub-diversion segment 122 is defined as the first diversion segment 121 of the first sub-diversion segment, and the diversion segment of the second sub-diversion rib located near the first sub-diversion segment is defined as the second diversion segment 122 of the second sub-diversion segment. That is, the first diversion segment 121 of the first sub-diversion rib is located near the second diversion segment 122 of the second sub-diversion rib. The above definitions are merely for ease of description and should not be used to limit the scope of protection of this application. The first diversion segment 121 of the first sub-diversion rib and the second diversion segment 122 of the second sub-diversion rib are arranged parallel to each other. In this embodiment, an electrolyte flow channel is formed between any two adjacent diversion ribs 12, that is, an electrolyte flow channel is formed between the first diversion section 121 of the first sub-diversion rib and the second diversion section 122 of the second sub-diversion rib. By arranging the diversion sections of the two adjacent diversion ribs 12 that are close to each other in parallel, the distance between the diversion sections of the two adjacent diversion ribs that are close to each other in the direction away from the first injection hole 11 is kept consistent. This is beneficial for the electrolyte to flow uniformly and stably to a position far away from the first injection hole 11, and can better disperse and guide the electrolyte to drip onto various positions of the bare battery cell, which facilitates faster wetting of the bare battery cell, speeds up the wetting time, and improves the wetting efficiency.

[0063] In some embodiments, such as Figure 1 and Figure 2As shown, the flow divider 12 includes a first flow divider 12a and a second flow divider 12b. The first flow divider 12a is located on the side of the first injection hole 11 closer to the center of the lower plastic part 10, and the second flow divider 12b is located on the side of the first injection hole 11 away from the center of the lower plastic part 10. The length of the first flow divider segment 121 of the first flow divider 12a can be greater than the length of the first flow divider segment 121 of the second flow divider 12b, or the length of the second flow divider segment 122 of the first flow divider 12a can be greater than the length of the second flow divider segment 122 of the second flow divider 12b, or the length of the first flow divider segment 121 of the first flow divider 12a can be greater than the length of the first flow divider segment 121 of the second flow divider 12b, and the length of the second flow divider segment 122 of the first flow divider 12a can also be greater than the length of the second flow divider segment 122 of the second flow divider 12b.

[0064] Preferably, the length of the first diversion section 121 of the first diversion rib 12a is greater than the length of the first diversion section 121 of the second diversion rib 12b, and the length of the second diversion section 122 of the first diversion rib 12a is also greater than the length of the second diversion section 122 of the second diversion rib 12b. Since the first injection hole 11 is offset from the center of the lower plastic part 10, the first injection hole 11 is also offset from the center of the bare battery cell. By making the length of the first diversion section 121 of the first diversion rib 12a greater than the length of the first diversion section 121 of the second diversion rib 12b, The length of the second diversion section 122 of the first diversion rib 12a is also greater than the length of the second diversion section 122 of the second diversion rib 12b, so that the electrolyte injected from the first injection hole 11 can flow more toward the center of the lower plastic part 10, ensuring that the electrolyte can flow to a position farther away from the first injection hole 11, thereby allowing the electrolyte to flow to the center of the bare battery cell and a position of the bare battery cell farther away from the first injection hole 11, thus making the area where the electrolyte falls on the bare battery cell more balanced, improving the absorption efficiency and uniformity of the electrolyte by the bare battery cell.

[0065] In some embodiments, the center of the first injection hole 11 and the center of the lower plastic part 10 are connected to form a center line O1. The first diversion segment 121 and the second diversion segment 122 of the first diversion rib 12a are symmetrical about the center line O1, so that the lengths of the first diversion segment 121 and the second diversion segment 122 of the first diversion rib 12a can be kept equal, so that the electrolyte can be dispersed and guided evenly to both sides of the center line O1, thereby allowing the electrolyte to be better dispersed and evenly dripped to various positions of the bare battery cell. This facilitates more uniform and rapid wetting of the bare battery cell. Similarly, the first shunt section 121 and the second shunt section 122 of the second shunt rib 12b are symmetrical about the center line O1. In this way, the lengths of the first shunt section 121 and the second shunt section 122 of the second shunt rib 12b can be kept equal, so that the electrolyte can be dispersed and guided evenly to both sides of the center line O1. This allows the electrolyte to be better dispersed and evenly dripped to various positions of the bare battery cell, facilitating more uniform and rapid wetting of the bare battery cell.

[0066] In some embodiments, such as Figure 1 and Figure 2 As shown, the diversion rib 12 also includes a third diversion rib 12c and a fourth diversion rib 12d. The third diversion rib 12c and the fourth diversion rib 12d are located on both sides of the center line O1. The first diversion segment 121 of the third diversion rib 12c is positioned close to the first diversion rib 12a, and the second diversion segment 122 of the third diversion rib 12c is positioned close to the second diversion rib 12b. The first diversion segment 121 of the fourth diversion rib 12d is positioned close to the second diversion rib 12b, and the second diversion segment 122 of the fourth diversion rib 12d is positioned close to the first diversion rib 12a. Thus, the diversion rib 12 can include at least four diversion ribs 12 (i.e., the first diversion rib 12a, the second diversion rib 12c, the third diversion rib 12d, the fourth diversion rib 12d, the fourth diversion rib 12d, the fourth diversion rib 12d, the fourth diversion rib 12d, the fourth diversion rib 12d, the fourth diversion rib 12c ... 12b, the third diversion rib 12c, and the fourth diversion rib 12d) can provide multiple flow paths for the electrolyte, thus dispersing the electrolyte flow path into multiple paths. This allows the electrolyte to be dispersed and guided to more different locations on the bare battery cell along the paths formed by the multiple diversion ribs 12. This not only further increases the area where the electrolyte falls onto the bare battery cell, thereby improving the absorption efficiency of the bare battery cell by the electrolyte, but also further shortens the wetting time of the bare battery cell and further improves the wetting efficiency of the bare battery cell. At the same time, since the electrolyte can be dispersed and discharged through multiple flow paths, this helps to reduce the probability of damage to the bare battery cell caused by the impact of the electrolyte on the bare battery cell and improves the wetting effect of the bare battery cell.

[0067] In this design, the length of the first diversion segment 121 of the third diversion rib 12c is greater than the length of the second diversion segment 122 of the third diversion rib 12c, and the length of the first diversion segment 121 of the fourth diversion rib 12d is less than the length of the second diversion segment 122 of the fourth diversion rib 12d. Since the first injection hole 11 is offset from the center of the lower plastic part 10, it is also offset from the center of the bare battery cell. Furthermore, the first diversion segment 121 of the third diversion rib 12c is closer to the first injection hole 11 than the second diversion segment 122 of the third diversion rib 12c, and the second diversion segment 122 of the fourth diversion rib 12d is closer to the first injection hole 11 than the first diversion segment 121 of the fourth diversion rib 12d. This is achieved by making the length of the first diversion segment 121 of the third diversion rib 12c... The length of the second diversion section 122 is greater than that of the third diversion rib 12c, and the length of the first diversion section 121 of the fourth diversion rib 12d is less than that of the second diversion section 122 of the fourth diversion rib 12d. This allows the electrolyte injected from the first injection hole 11 to flow more towards the center of the lower plastic part 10, ensuring that the electrolyte can flow to a position farther away from the first injection hole 11. This makes the area where the electrolyte falls onto the bare cell more evenly, improving the absorption efficiency and uniformity of the electrolyte by the bare cell.

[0068] In some embodiments, such as Figure 1 and Figure 2 As shown, the distance d1 between the second diversion section 122 of the first diversion rib 12a and the first diversion section 121 of the third diversion rib 12c is greater than the distance d2 between the first diversion section 121 of the second diversion rib 12b and the second diversion section 122 of the third diversion rib 12c; the distance d3 between the first diversion section 121 of the first diversion rib 12a and the second diversion section 122 of the fourth diversion rib 12d is greater than the distance d4 between the second diversion section 122 of the second diversion rib 12b and the first diversion section 121 of the fourth diversion rib 12d.

[0069] Because the first injection hole 11 is offset from the center of the lower plastic part 10, it is also offset from the center of the bare battery cell. Furthermore, the electrolyte flow channel formed between the second diversion section 122 of the first diversion rib 12a and the first diversion section 121 of the third diversion rib 12c is closer to the first injection hole 11 than the electrolyte flow channel formed between the first diversion section 121 of the second diversion rib 12b and the second diversion section 122 of the third diversion rib 12c. Similarly, the electrolyte flow channel formed between the first diversion section 121 of the first diversion rib 12a and the second diversion section 122 of the fourth diversion rib 12d is also closer to the first injection hole 11 than the electrolyte flow channel formed between the second diversion section 122 of the second diversion rib 12b and the first diversion section 121 of the fourth diversion rib 12d. This allows the electrolyte flow channel to pass through the second diversion section 122 of the first diversion rib 12a and the first diversion section 122 of the third diversion rib 12c. The spacing d1 of the flow segment 121 is greater than the spacing d2 of the first flow segment 121 of the second flow rib 12b and the second flow segment 122 of the third flow rib 12c. This makes the spacing d3 of the first flow segment 121 of the first flow rib 12a and the second flow segment 122 of the fourth flow rib 12d greater than the spacing d4 of the second flow segment 122 of the second flow rib 12b and the first flow segment 121 of the fourth flow rib 12d. This results in a relatively larger width for electrolyte flow closer to the center of the lower plastic part 10, increasing the width of the electrolyte flow channel to improve the electrolyte flow rate. This allows the electrolyte injected from the first injection hole 11 to flow more towards the center of the lower plastic part 10, ensuring that the electrolyte can flow to a position farther from the first injection hole 11. This makes the electrolyte fall more evenly onto the bare battery cell, speeds up the wetting time, and improves the absorption efficiency and uniformity of the bare battery cell for the electrolyte.

[0070] In some embodiments, the first included angle between the first diversion section 121 and the second diversion section 122 of the first diversion rib 12a is α1, the second included angle between the first diversion section 121 and the second diversion section 122 of the second diversion rib 12b is α2, the third included angle between the first diversion section 121 and the second diversion section 122 of the third diversion rib 12c is α3, and the fourth included angle between the first diversion section 121 and the second diversion section 122 of the fourth diversion rib 12d is α4, wherein α4 < α3 = α2 < α1. Since the first diversion rib 12a is closer to the center of the lower plastic part 10 than the third diversion rib 12c and the fourth diversion rib 12d, and the third diversion rib 12c and the fourth diversion rib 12d are closer to the center of the lower plastic part 10 than the second diversion rib 12b, by satisfying the relationship: α4<α3=α2<α1, the electrolyte can flow more towards the center of the lower plastic part 10, and also more towards the edge of the lower plastic part 10 away from the first injection hole 11. This ensures that the electrolyte can flow to the edge of the lower plastic part 10 that is farther away from the first injection hole 11, thereby making the area where the electrolyte falls on the bare cell more evenly, accelerating the wetting time, and improving the absorption efficiency and uniformity of the electrolyte by the bare cell.

[0071] It is understandable that when the diversion rib 12 includes a first diversion rib 12a, a second diversion rib 12b, a third diversion rib 12c, and a fourth diversion rib 12d, there are at least four diversion ribs 12. The first diversion rib 12a and the third diversion rib 12c constitute two adjacent diversion ribs, and one of the first diversion rib 12a and the third diversion rib 12c constitutes a first sub-diversion rib, while the other constitutes a second sub-diversion rib. The first diversion rib 12a and the fourth diversion rib 12d constitute two adjacent diversion ribs, and the ... One of the flow ribs 12d constitutes the first sub-flow rib, and the other constitutes the second sub-flow rib; the second flow rib 12b and the third flow rib 12c constitute two adjacent flow ribs, and one of the second flow rib 12b and the third flow rib 12c constitutes the first sub-flow rib, and the other constitutes the second sub-flow rib; the second flow rib 12b and the fourth flow rib 12d constitute two adjacent flow ribs, and one of the second flow rib 12b and the fourth flow rib 12d constitutes the first sub-flow rib, and the other constitutes the second sub-flow rib.

[0072] As an optional implementation method, such as Figure 3 and Figure 4As shown, the lower plastic part 10 can be circular in shape, and an arc-shaped support fence 13 protrudes from the edge of the first surface 10a. The maximum height h1 of the diversion rib 12 protruding relative to the first surface 10a is less than the height h2 of the arc-shaped support fence 13 protruding relative to the first surface 10a. If the height h1 of the diversion rib 12 protruding relative to the first surface 10a is equal to or even higher than the height h2 of the arc-shaped support fence 13 protruding relative to the first surface 10a, it will not only be costly and occupy a large space, but also, when the collector plate is folded and covered on the arc-shaped support fence 13, a partition space is formed between the first diversion section 121 and the second diversion section 122, which affects ventilation and makes it difficult to open the explosion-proof valve, thus easily leading to safety hazards. Therefore, through the above settings, the height of the diversion rib 12 protruding too much relative to the first surface 10a can be avoided, so as to avoid the formation of a partition space between the first diversion section 121 and the second diversion section 122 when the collector plate is folded and covered on the arc-shaped support fence 13. This ensures that the explosion-proof valve can be smoothly used for pressure relief and explosion prevention, improves the safety of use, and at the same time reduces costs and realizes the miniaturization design of the lower plastic part 10.

[0073] As another alternative implementation method, such as Figures 6 to 8 As shown, the lower plastic part 10 can be square in shape. An explosion-proof valve grille 14 is protruding from the center of the first surface 10a. A groove 141 penetrating the explosion-proof valve grille 14 is provided in the center of the explosion-proof valve grille 14. In the direction in which the diversion rib 12 protrudes relative to the first surface 10a, the ends of the first diversion section 121 and the second diversion section 122 that are away from the first injection hole 11 are both higher than or flush with the bottom surface 1411 of the groove 141. This ensures that the electrolyte can pass through the groove 141 in the center of the explosion-proof valve grille 14 and flow to a position on the lower plastic part 10 that is farther from the first injection hole 11. This allows the electrolyte to fall to a position on the bare battery cell that is farther from the first injection hole 11, thereby enabling the electrolyte to be dispersed and evenly dripped to various positions on the bare battery cell, facilitating more uniform and rapid wetting of the bare battery cell.

[0074] Please see Figure 9 and Figure 10 The second aspect of this invention discloses a top cover assembly 20, which includes a top cover plate 21 and a lower plastic component 10 as described in the first aspect above. The lower plastic component 10 is connected to the top cover plate 21, and the diversion rib 12 is located on the side of the lower plastic component 10 opposite to the top cover plate 21. The top cover plate 21 is provided with a second injection hole 211 communicating with a first injection hole 11. It is understood that the top cover assembly 20 having the lower plastic component 10 described in the first aspect above can bring the same or similar beneficial effects, as can be seen in the description of the embodiments of the lower plastic component 10, which will not be repeated here.

[0075] Please see Figure 11 The third aspect of this invention discloses an energy storage device 30, which includes a housing 31, a bare battery cell 32, and a top cover assembly 20 as described in the second aspect above. The housing 31 has an opening 311, the bare battery cell 32 is housed within the housing 31, and the top cover plate 21 is sealed to the opening 311. The lower plastic part 10 is disposed facing the bare battery cell 32. It is understood that the energy storage device 30 having the top cover assembly 20 described in the second aspect above can bring the same or similar beneficial effects, as specifically described in the embodiment of the lower plastic part, which will not be repeated here.

[0076] The energy storage device 30 may include, but is not limited to, individual cells, battery modules, battery packs, and battery systems. When the energy storage device 30 is an individual cell, it may be a square cell or a round cell.

[0077] A fourth aspect of this invention discloses an electrical device that includes the energy storage device described in the third aspect. The technical solutions of this application are applicable to various electrical devices that use energy storage devices, such as electric vehicles, electric toys, power tools, electric vehicles, ships and spacecraft, mobile phones, portable devices, PDAs, or laptops.

[0078] The foregoing has provided a detailed description of a lower plastic part, a top cover assembly, an energy storage device, and an electrical device disclosed in the embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the embodiments above are only for the purpose of helping to understand the lower plastic part, the top cover assembly, the energy storage device, and the electrical device of the present invention and their core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A lower plastic part, characterized in that, The lower plastic part (10) includes a first surface (10a) and a second surface (10b) facing away from each other, and the lower plastic part (10) is provided with a first injection hole (11) that passes through the first surface (10a) and the second surface (10b). The first surface (10a) is provided with a diversion rib (12). The diversion rib (12) is located at the edge of the first injection hole (11), and the diversion rib (12) includes a first diversion section (121) and a second diversion section (122) connected at an angle. A bending portion (123) is formed at the connection between the first diversion section (121) and the second diversion section (122). The bending portion (123) is located close to the first injection hole (11). The center of the first injection hole (11) and the center of the lower plastic part (10) are eccentrically arranged. The diversion rib (12) includes a first diversion rib (12a) and a second diversion rib (12b). The first diversion rib (12a) is located on the side of the first injection hole (11) close to the center of the lower plastic part (10), and the second diversion rib (12b) is located on the side of the first injection hole (11) away from the center of the lower plastic part (10). The length of the first diversion segment (121) of the first diversion rib (12a) is greater than the length of the first diversion segment (121) of the second diversion rib (12b), and / or, the length of the second diversion segment (122) of the first diversion rib (12a) is greater than the length of the second diversion segment (122) of the second diversion rib (12b).

2. The lower plastic part according to claim 1, characterized in that, The first diversion section (121) extends in a straight line or arc from its connection with the bend (123) in a direction away from the first injection hole (11); and / or, The second diversion section (122) extends in a straight line or arc from the connection with the bending portion (123) in a direction away from the first injection hole (11).

3. The lower plastic part according to claim 1, characterized in that, The height of the first diversion section (121) protruding relative to the first surface (10a) gradually decreases from the connection point between the first diversion section (121) and the bend (123) in a direction away from the first injection hole (11); and / or, The height of the second diversion section (122) protruding relative to the first surface (10a) gradually decreases from the connection between the second diversion section (122) and the bending portion (123) in a direction away from the first injection hole (11).

4. The lower plastic part according to claim 1, characterized in that, There are multiple diversion ribs (12), and the multiple diversion ribs (12) are distributed at intervals along the circumference of the first injection hole (11) at the edge of the first injection hole (11).

5. The lower plastic part according to claim 4, characterized in that, Any two adjacent diversion ribs (12) are respectively the first sub-diversion rib and the second sub-diversion rib. The first diversion segment (121) of the first sub-diversion rib is set close to the second diversion segment (122) of the second sub-diversion rib, and the first diversion segment (121) of the first sub-diversion rib and the second diversion segment (122) of the second sub-diversion rib are set parallel to each other.

6. The lower plastic part according to claim 1, characterized in that, The center of the first injection hole (11) and the center of the lower plastic part (10) are connected to form a center line (O1). The first diversion section (121) and the second diversion section (122) of the first diversion rib (12a) are symmetrical about the center line (O1). The first diversion section (121) and the second diversion section (122) of the second diversion rib (12b) are symmetrical about the center line (O1).

7. The lower plastic part according to claim 6, characterized in that, The diversion rib (12) further includes a third diversion rib (12c) and a fourth diversion rib (12d). The third diversion rib (12c) and the fourth diversion rib (12d) are respectively located on both sides of the center line (O1). The first diversion segment (121) of the third diversion rib (12c) is located close to the first diversion rib (12a), and the second diversion segment (122) of the third diversion rib (12c) is located close to the second diversion rib (12b). The first diversion segment (121) of the fourth diversion rib (12d) is located close to the second diversion rib (12b), and the second diversion segment (122) of the fourth diversion rib (12d) is located close to the first diversion rib (12a). Wherein, the length of the first diversion section (121) of the third diversion rib (12c) is greater than the length of the second diversion section (122) of the third diversion rib (12c), and the length of the first diversion section (121) of the fourth diversion rib (12d) is less than the length of the second diversion section (122) of the fourth diversion rib (12d).

8. The lower plastic part according to claim 7, characterized in that, The distance between the second diversion section (122) of the first diversion rib (12a) and the first diversion section (121) of the third diversion rib (12c) is greater than the distance between the first diversion section (121) of the second diversion rib (12b) and the second diversion section (122) of the third diversion rib (12c). The distance between the first diversion segment (121) of the first diversion rib (12a) and the second diversion segment (122) of the fourth diversion rib (12d) is greater than the distance between the second diversion segment (122) of the second diversion rib (12b) and the first diversion segment (121) of the fourth diversion rib (12d).

9. The lower plastic part according to claim 7, characterized in that, The first included angle between the first diversion section (121) and the second diversion section (122) of the first diversion rib (12a) is α1, the second included angle between the first diversion section (121) and the second diversion section (122) of the second diversion rib (12b) is α2, the third included angle between the first diversion section (121) and the second diversion section (122) of the third diversion rib (12c) is α3, and the fourth included angle between the first diversion section (121) and the second diversion section (122) of the fourth diversion rib (12d) is α4, wherein α4 < α3 = α2 < α1.

10. The lower plastic part according to any one of claims 1-9, characterized in that, The lower plastic part (10) is circular in shape, and an arc-shaped support fence (13) is provided at the edge of the first surface (10a); The maximum height of the diversion rib (12) protruding relative to the first surface (10a) is less than the height of the arc-shaped support fence (13) protruding relative to the first surface (10a).

11. The lower plastic part according to any one of claims 1-9, characterized in that, The lower plastic part (10) is square in shape, and an explosion-proof valve grille (14) is protruding from the middle of the first surface (10a). A groove (141) penetrating the explosion-proof valve grille (14) is provided in the middle of the explosion-proof valve grille (14). In the direction in which the diversion rib (12) protrudes relative to the first surface (10a), the ends of the first diversion section (121) and the second diversion section (122) that are away from the first injection hole (11) are both higher than the bottom surface (1411) of the groove (141) or flush with the bottom surface (1411) of the groove (141).

12. A top cover assembly, characterized in that, The top cover assembly (20) includes a top cover plate (21) and a lower plastic part (10) as described in any one of claims 1-11, the lower plastic part (10) being connected to the top cover plate (21), the diversion rib (12) being located on the side of the lower plastic part (10) facing away from the top cover plate (21), and the top cover plate (21) having a second injection hole (211) communicating with the first injection hole (11).

13. An energy storage device, characterized in that, The energy storage device (30) has a housing (31), a bare battery cell (32), and a top cover assembly (20) as described in claim 12. The housing (31) has an opening (311), the bare battery cell (32) is built into the housing (31), the top cover plate (21) is sealed to the opening (311), and the lower plastic part (10) is disposed toward the bare battery cell (32).

14. An electrical appliance, characterized in that, The electrical equipment includes the energy storage device (30) as described in claim 13.

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