Battery cell cover plate, battery cell, and battery pack

Abstract

A battery cell cover plate (100), a battery cell (200), and a battery pack. The battery cell cover plate (100) comprises a cover plate body (10); the cover plate body (10) has a top surface (11) and a bottom surface (12) which are opposite to each other, and a liquid injection hole (13) is formed in the cover plate body (10); and the liquid injection hole (13) runs through from the top surface (11) to the bottom surface (12). The bottom surface (12) is configured to face a jelly roll (220); at least partial area of the bottom surface (12) is configured to be a flow guide surface (121); the flow guide surface (121) is adjacent to the liquid injection hole (13); and the flow guide surface (121) is inclined from the liquid injection hole (13) to a direction away from the top surface (11).

Description

Battery cell cover plate, battery cell and battery pack

[0001] The present application claims priority to the Chinese patent application No. 202420770248.5 filed on April 15, 2024 with the China Patent Office, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular to a battery cell cover plate, a battery cell and a battery pack. BACKGROUND

[0003] In the related art, the battery cell mainly includes a shell, a cell pack and a battery cell cover plate. The shell includes a mounting cavity and a cavity opening in communication with the mounting cavity. The cell pack is mounted in the mounting cavity. The battery cell cover plate is covered at the cavity opening of the mounting cavity to seal the installation of the cell pack. And the battery cell needs to go through a baking process in the production process to remove the moisture in the cell pack, improve the electrical performance and safety. SUMMARY

[0004] When the battery cell is baked, since the bottom surface of the battery cell cover plate is perpendicular to the upward direction of the water vapor, the water vapor will be retained on the bottom surface of the battery cell cover plate after contacting the bottom surface of the battery cell cover plate, and cannot continue to flow to the liquid injection hole and be discharged, so that the water vapor cannot be quickly discharged from the liquid injection hole, and the moisture in the cell pack cannot be quickly dissipated, resulting in low drying efficiency.

[0005] The present application provides a battery cell cover plate. The battery cell cover plate includes a cover plate body having opposite top and bottom surfaces. The cover plate body is provided with a liquid injection hole penetrating from the top surface to the bottom surface. The bottom surface is used to face the cell pack, and at least part of the area on the bottom surface is configured as a flow guide surface. The flow guide surface is adjacent to the liquid injection hole and is also inclined from the liquid injection hole to the direction away from the top surface.

[0006] The present application also provides a battery cell. The battery cell includes a shell, a cell pack and the above-mentioned battery cell cover plate. The shell has a mounting cavity and a cavity opening in communication with the mounting cavity. The cell pack is mounted in the mounting cavity. The battery cell cover plate is covered at the cavity opening.

[0007] The present application also provides a battery pack, which includes the above-mentioned battery cell. ADVANTAGEOUS EFFECTS

[0008] The electric cell cover plate provided by the application sets at least the bottom surface of the cover plate body as a flow guide surface, the flow guide surface is adjacent to the liquid injection hole, and the flow guide surface is also inclined from the liquid injection hole to the direction away from the top surface. When the rising water vapor flows onto the flow guide surface, the water vapor can continue to flow to the liquid injection hole along the inclined flow guide surface, and then is discharged from the liquid injection hole in time, so that the water retention is avoided, and the technical problem that the water in the cell package can be discharged more quickly is solved. BRIEF DESCRIPTION OF DRAWINGS

[0009] Fig. 1 is a perspective view of the electric cell cover plate provided by the application;

[0010] Fig. 2 is a structural sectional view of the electric cell cover plate in Fig. 1;

[0011] Fig. 3 is a structural sectional view of the electric cell cover plate in Fig. 2 at A-A;

[0012] Fig. 4 is a structural sectional view of another embodiment of the electric cell cover plate provided by the application;

[0013] Fig. 5 is a structural sectional view of the electric cell cover plate in Fig. 4 at B-B;

[0014] Fig. 6 is a structural sectional view of still another embodiment of the electric cell cover plate provided by the application;

[0015] Fig. 7 is a structural sectional view of an embodiment of the electric cell provided by the application.

[0016] Explanation of reference signs:

[0017] 100, electric cell cover plate; 10, cover plate body; 11, top surface; 12, bottom surface; 121, flow guide surface; 1211, first flow guide surface; 1212, second flow guide surface; 122, first bottom surface; 123, second bottom surface; 124, flow guide groove; 125, explosion-proof hole; 13, liquid injection hole; 14, cover body; 15, insulating plate; 151, positive electrode insulating plate; 152, negative electrode insulating plate; 16, reinforcing boss; 161, guide surface; 1611, proximal side; 1612, distal side; 17, explosion-proof valve; 18, positive electrode post; 19, negative electrode post; 200, electric cell; 210, shell; 211, mounting cavity; 212, cavity opening; 220, cell package. Embodiments of the application

[0018] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0019] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, and the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, and the horizontal height of the first feature is less than that of the second feature.

[0020] In the description of the present embodiment, the terms "up", "down", "left", "right", "front", "back" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used to distinguish the description and have no special meaning.

[0021] As shown in FIG. 1, the utility model provides a kind of electric core cover plate 100, electric core cover plate 100 is the key component of electric core 200, specifically, can refer to Figure 7, Figure 7 is one embodiment that the utility model electric core cover plate 100 is assembled into electric core 200 with other components, electric core 200 mainly includes shell 210, core bag 220 and electric core cover plate 100. Shell 210 is generally made of metal (such as aluminum, copper, stainless steel etc.) material with good thermal conductivity and mechanical properties, so as to effectively protect the internal structure (such as core bag 220) of electric core 200, and shell 210 has installation cavity 211 and cavity mouth 212 communicated with installation cavity 211.

[0022] Core bag 220 is installed in the installation cavity 211 of shell 210, and core bag 220 includes positive electrode, negative electrode and separator, and core bag 220 is an important component in electric core 200 for generating electrochemical reaction and then realizing charge and discharge.

[0023] The cell cover plate 100 covers the cavity opening 212 of the mounting cavity 211 to protect the internal structure of the cell 200 from damage caused by external physical or chemical factors.

[0024] As shown in FIG. 1 and FIG. 2, FIG. 1 is a perspective view of an embodiment of the cell cover plate of the present application, and FIG. 2 is a sectional view of the cell cover plate of FIG. 1. The cell cover plate 100 of the present application comprises a cover plate body 10, which has a bottom surface 12 facing the cell pack 220 and a top surface 11 opposite to the bottom surface 12. The cover plate body 10 is provided with a liquid injection hole 13, which penetrates through the top surface 11 and the bottom surface 12.

[0025] Specifically, in the present embodiment, the cover plate body 10 mainly comprises a cover 14 and an insulating plate 15. The cover 14 can be formed of an aluminum sheet, and the insulating plate 15 can be made of plastic. The insulating plate 15 can be fixed to the side of the cover 14 facing the cell pack 220 by means of heat fusion. As shown in FIG. 2, the side surface of the cover 14 away from the insulating plate 15 is the top surface 11, and the side surface of the insulating plate 15 away from the cover 14 is the bottom surface 12. When assembling the cell 200, the bottom surface 12 faces the cell pack 220 inside the shell 210, and the top surface 11 faces away from the cell pack 220, as shown in FIG. 7.

[0026] The cover plate body 10 is provided with a liquid injection hole 13, which penetrates from the top surface 11 to the bottom surface 12. After the cover plate body 10 is assembled on the shell 210, the liquid injection hole 13 is in communication with the mounting cavity 211 where the cell pack 220 is located. This facilitates the discharge of water vapor during baking and the injection of electrolyte into the mounting cavity 211 after baking. The size, number, and position of the liquid injection hole 13 on the cover plate body 10 can be designed flexibly according to actual needs, and are not limited in detail herein.

[0027] Of course, the cover plate body 10 is generally also provided with positive electrode posts 18, negative electrode posts 19, explosion-proof valves 17, sealing members, and other components. The specific structure, mounting method, and function of these components can be referred to related prior art, and will not be described in detail herein.

[0028] It should be noted that after the shell 210, the cell pack 220, and the cover plate body 10 are assembled, and before the electrolyte is injected, the cell 200 needs to be baked to remove the moisture on the cell pack 220 and improve the electrical performance and safety of the cell. However, in related technologies, because the bottom surface of the cell cover plate is a horizontal surface, it is perpendicular to the upward direction of the water vapor. Therefore, after the water vapor rises and contacts the bottom surface of the cell cover plate, it will stay on the bottom surface of the cell cover plate and not continue to flow to the liquid injection hole and be discharged, resulting in that the water vapor cannot be quickly discharged from the liquid injection hole, and the moisture in the cell pack cannot be quickly removed, leading to low drying efficiency.

[0029] Therefore, to solve the above technical problems, in the embodiments of the present application, as shown in FIG. 2, at least part of the area on the bottom surface 12 is configured as a flow guide surface 121, the flow guide surface 121 is adjacent to the liquid injection hole 13, and the flow guide surface 121 is also inclined away from the top surface 11 from the liquid injection hole 13.

[0030] Specifically, the bottom surface 12 can be a part of the area close to the liquid injection hole 13 which is configured as the flow guide surface 121, or the entire area on the bottom surface 12 can be configured as the flow guide surface 121, which can be flexibly selected according to needs. For example, referring to FIG. 2, when the flow guide surface 121 is set, the flow guide surface 121 can be set only on the left side of the liquid injection hole 13, or the flow guide surface 121 can be set only on the right side of the liquid injection hole 13. Or referring to FIG. 3, which is a structural cross-sectional view of the battery cell cover plate at A-A in FIG. 2, when the flow guide surface 121 is set, the flow guide surface 121 can be set only on the back side of the liquid injection hole 13, or the flow guide surface 121 can be set only on the front side of the liquid injection hole 13. Or, referring to FIG. 2 and FIG. 3, the flow guide surface 121 can be set on at least two of the front, back, left and right sides of the liquid injection hole 13, or even the flow guide surface 121 can be set at any position corresponding to the circumferential direction of the liquid injection hole 13.

[0031] In summary, the specific setting mode of the flow guide surface 121 can be determined according to actual conditions. For example, in some embodiments, the position of the liquid injection hole 13 on the cover plate body 10 is biased to the left side of the cover plate body 10, and the bottom surface 12 has a larger area on the right side of the liquid injection hole 13. At this time, the flow guide surface 121 can be set on the right side of the liquid injection hole 13 to guide more water vapor to the liquid injection hole 13.

[0032] The flow guide surface 121 is adjacent to the liquid injection hole 13, and the flow guide surface 121 is inclined away from the top surface 11 from the liquid injection hole 13. Specifically, as shown in FIG. 2, the cover plate body 10 extends horizontally during the baking process of the battery cell 200, and the bottom surface 12 is below the top surface 11. Therefore, the flow guide surface 121 is inclined downward relative to the liquid injection hole 13. Therefore, when the rising water vapor flows onto the flow guide surface 121, the water vapor can continue to flow to the liquid injection hole 13 along the flow guide surface 121 because the flow guide surface 121 is inclined, and then is discharged from the liquid injection hole 13 in time to avoid stagnation, thereby ensuring that the moisture in the core package 220 can be discharged faster, and improving the technical problem that the moisture discharge speed on the core package 220 is slow when the battery cell 200 is baking.

[0033] It should be noted that the specific way in which the flow guide surface 121 is adjacent to the liquid injection hole 13 can be various. For example, in an embodiment, the flow guide surface 121 is connected to the circumference of the liquid injection hole 13, that is, at least part of the edge of the liquid injection hole 13 on the bottom surface 12 is formed by the edge of the flow guide surface 121.

[0034] For example, as shown in FIG. 2, in an embodiment, the cover plate body 10 includes a cover 14 and an insulation plate 15 (including a positive electrode insulation plate 151 and a negative electrode insulation plate 152), the liquid injection hole 13 is formed on the cover 14, and the flow guide surface 121 is formed on the insulation plate 15. At this time, there can be a certain gap between the flow guide surface 121 and the edge of the liquid injection hole 13, and the flow guide surface 121 can be arranged as close to the liquid injection hole 13 as possible. It should be noted that, in this embodiment, because the liquid injection hole 13 is formed on the cover 14 and the flow guide surface 121 is formed on the insulation plate 15, the insulation plate 15 can be provided with a corresponding avoiding hole corresponding to the liquid injection hole 13, so that the liquid injection hole 13 can extend to the bottom surface 12. At this time, the lower end of the liquid injection hole 13 (i.e., the end close to the core package 220) can be flush with the bottom surface 12, or there can be a certain height difference. For example, in the structure shown in FIG. 3, the lower end of the liquid injection hole 13 protrudes downward relative to the bottom surface 12. In the structure shown in FIG. 5, the lower end of the liquid injection hole 13 is recessed upward relative to the bottom surface 12.

[0035] Optionally, in an embodiment, please refer to FIG. 2 and FIG. 3, the flow guide surface 121 is an arc surface and surrounds the liquid injection hole 13, and the liquid injection hole 13 is located closer to the top surface 11 than any position on the flow guide surface 121. Specifically, in this embodiment, the flow guide surface 121 is an arc surface similar to a spherical cap surface, and the flow guide surface 121 is recessed as a whole toward the side where the top surface 11 is located. Taking the upward and downward directions in FIG. 2 and FIG. 3 as the reference, the bottom surface 12 has a highest point (in FIG. 2 and FIG. 3, the position closer to the upper side indicates a higher position), and the liquid injection hole 13 is arranged at the position of the highest point, so that the liquid injection hole 13 is closer to the top surface 11 than any position on the flow guide surface 121.

[0036] It can be understood that, by arranging the flow guide surface 121 to surround the liquid injection hole 13 and arranging the liquid injection hole 13 at the highest position of the flow guide surface 121, water vapor in all directions can be collected to the liquid injection hole 13 and discharged, so that the water vapor discharge efficiency is improved, and the drying efficiency is improved.

[0037] Alternatively, in another embodiment, the flow guide surface 121 is a conical surface, specifically a circular conical surface or a multi-prism conical surface, and the liquid injection hole 13 is located at the top of the conical surface. In this way, water vapor in all directions can also be collected to the liquid injection hole 13 and discharged, so that the water vapor discharge efficiency is improved.

[0038] Optionally, as shown in FIG. 4, in an embodiment, the injection hole 13 is provided in plurality, and the bottom surface 12 is formed with a flow guide surface 121 at a position corresponding to each injection hole 13. Specifically, in the structural scheme shown in FIG. 4, the injection hole 13 is provided in two, and the bottom surface 12 is formed with a flow guide surface 121 at a position corresponding to each injection hole 13. The flow guide surface 121 formed can be a slanted plane, an arc surface or a conical surface, for example, in the embodiment shown in the figure, the two flow guide surfaces 121 are both arc surfaces, and the two injection holes 13 are located at the highest positions of the two arc surfaces. It can be understood that, by providing multiple injection holes 13 and forming a flow guide surface 121 at a position corresponding to each injection hole 13, the water vapor in the battery cell 200 can be discharged more quickly.

[0039] Optionally, in an embodiment, as shown in FIG. 1, the cover plate body 10 includes a cover body 14 and an insulating plate 15 fixed on the cover body 14. The cover body 14 can be an aluminum sheet with good heat dissipation performance, and the insulating plate 15 can be made of plastic. As shown in FIG. 2, the insulating plate 15 further includes a positive electrode insulating plate 151 and a negative electrode insulating plate 152 arranged in a spaced manner. The positive electrode insulating plate 151 is used to be connected with the positive electrode pole 18, and the negative electrode insulating plate 152 is used to be connected with the negative electrode pole 19, so as to perform corresponding insulation treatment on the positive electrode pole 18 and the negative electrode pole 19 respectively (usually used for insulation between the pole and the cover body 14).

[0040] In the embodiment, as shown in FIG. 2, the positive electrode insulating plate 151 has a first bottom surface 122 for facing the core bag 220, and the negative electrode insulating plate 152 has a second bottom surface 123 for facing the core bag 220. The first bottom surface 122 and the second bottom surface 123 together constitute the bottom surface 12.

[0041] The injection hole 13 penetrates one of the positive electrode insulating plate 151 and the negative electrode insulating plate 152, for example, as shown in FIG. 2, the injection hole 13 on the cover plate body 10 is provided in one, and the injection hole 13 corresponds to and penetrates the positive electrode insulating plate 151. At this time, the first bottom surface 122 is formed with a first flow guide surface 1211, and the second bottom surface 123 is formed with a second flow guide surface 1212. The first flow guide surface 1211 and the second flow guide surface 1212 together constitute the flow guide surface 121.

[0042] Specifically, as shown in FIG. 2, the first flow guide surface 1211 and the second flow guide surface 1212 are both arc surfaces. When the first flow guide surface 1211 and the second flow guide surface 1212 are formed on the first bottom surface 122 and the second bottom surface 123 respectively, the principle is that the position of the injection hole 13 is the highest point of the flow guide surface 121 (with the upward and downward direction in FIG. 2 as the reference, the position closer to the upper side is higher). That is, the first flow guide surface 1211 and the second flow guide surface 1212 can just constitute a flow guide surface 121 with a higher highest point and a larger area, and the injection hole 13 is located at the highest point of the flow guide surface 121.

[0043] It can be understood that, in the case that the bottom surface 12 is composed of the first bottom surface 122 and the second bottom surface 123 which are spaced apart, the first flow guide surface 1211 formed on the first bottom surface 122 and the second flow guide surface 1212 formed on the second bottom surface 123 jointly form the flow guide surface 121 with the highest point and a larger area, so that more water vapor can be guided to the liquid injection hole 13, and the water vapor discharge efficiency of the battery cell 200 is improved.

[0044] In another embodiment, at least one liquid injection hole 13 is formed through the positive electrode insulating plate 151 and the negative electrode insulating plate 152 respectively, as shown in FIG. 4, which is a structural sectional view of another embodiment of the battery cell cover plate of the present application. In this structural scheme, two liquid injection holes 13 are provided, and the two liquid injection holes 13 correspond to the positive electrode insulating plate 151 and the negative electrode insulating plate 152 respectively. At this time, the first bottom surface 122 and the second bottom surface 123 form the flow guide surface 121 at the respective corresponding liquid injection holes 13, so that the water vapor in the battery cell 200 can be discharged more quickly.

[0045] In an embodiment, as shown in FIG. 6, the two sides of the bottom surface 12 in the length direction further protrude with reinforcing bosses 16, so as to reinforce the structural strength of the cover plate body 10 through the reinforcing bosses 16, and the reinforcing bosses 16 have a guide surface 161 for facing the core pack 220. The guide surface 161 is obliquely arranged and has opposite proximal side 1611 and distal side 1612. On the same guide surface 161, the proximal side 1611 is closer to the liquid injection hole 13 than the distal side 1612, and the proximal side 1611 is closer to the top surface 11 than the distal side 1612.

[0046] That is, with the up-down direction in the figure as a reference, the entire guide surface 161 is inclined upward relative to the distal side 1612. Therefore, when the water vapor rises and contacts the guide surface 161 of the reinforcing boss 16, it will flow along the guide surface 161 to the position of the liquid injection hole 13, and then more water vapor will be guided to the liquid injection hole 13, thereby improving the water vapor discharge efficiency.

[0047] In an embodiment, as shown in FIG. 1, the flow guide surface 121 further has a flow guide groove 124 recessed thereon. One end of the flow guide groove 124 communicates with the liquid injection hole 13, and the other end extends away from the liquid injection hole 13. Specifically, the end of the flow guide groove 124 away from the liquid injection hole 13 can extend in any direction, such as extending to a position where there is more water vapor. It can be understood that, compared with the flow guide surface 121 with a larger area, the space in the flow guide groove 124 is smaller, so that the directivity of the water vapor flowing in the flow guide groove 124 is stronger, and the water vapor basically does not deviate left and right during the flowing process in the flow guide groove 124, thereby the water vapor can be guided to the liquid injection hole 13 more quickly, and the water vapor discharge efficiency is improved.

[0048] It should be noted that the extension length, cross-sectional shape, number, etc. of the flow guide groove 124 can be flexibly designed as required, for example, the flow guide groove 124 can be provided with multiple flow guide grooves, and the flow guide groove 124 extends from the liquid injection hole 13 to the edge of the flow guide surface 121, so as to guide more water vapor to the liquid injection hole 13 more quickly.

[0049] Further, in an embodiment, as shown in FIG. 1, the bottom surface 12 is further recessed with an explosion-proof hole 125 for mounting an explosion-proof valve 17, and the flow guide groove 124 further communicates with the explosion-proof hole 125, so that the water vapor in the explosion-proof hole 125 can be guided to the liquid injection hole 13 through the flow guide groove 124 and discharged, avoiding the water vapor to stay in the explosion-proof hole 125.

[0050] As for the depth of the flow guide groove 124, in an embodiment, the cover plate body 10 includes a cover body 14 and an insulating plate 15 fixed to the cover body 14, the surface of the cover body 14 away from the insulating plate 15 forms the top surface 11, the surface of the insulating plate 15 away from the cover body 14 forms the bottom surface 12, the depth of the flow guide groove 124 is greater than or equal to one third of the thickness of the insulating plate 15 and less than or equal to two thirds of the thickness of the insulating plate 15. It can be understood that if the depth of the flow guide groove 124 is too small, the effect of rapid flow guiding is not obvious enough, and if the depth of the flow guide groove 124 is too large, it will affect the structural strength and insulation effect of the insulating plate 15, therefore, by making the depth of the flow guide groove 124 greater than or equal to one third of the thickness of the insulating plate 15 and less than or equal to two thirds of the thickness of the insulating plate 15, rapid flow guiding can be achieved while avoiding affecting the structural strength and insulation effect of the insulating plate 15.

[0051] The second aspect, as shown in FIG. 7, the embodiment of the utility model provides a kind of electric core 200, electric core 200 includes shell 210, core bag 220 and electric core cover plate 100, shell 210 has installation cavity 211 and with installation cavity 211 The cavity mouth 212, core bag 220 is installed in installation cavity 211, electric core cover plate 100 is covered in cavity mouth 212, and the specific structure of electric core cover plate 100 refers to any one embodiment above.It is because that the electric core 200 of the application adopts all technical solutions of above all embodiments, so at least has all beneficial effects brought by the technical scheme of above embodiment, here will not be repeated.

[0052] The third aspect, the embodiment of the utility model provides a kind of battery pack (not shown), battery pack can be used in electric equipment such as car, and battery pack includes the electric core 200 described above, and battery pack includes multiple electric core 200, multiple electric core 200 is arranged in matrix mode in multiple rows and multiple columns.

Claims

1. An electric cell cover plate, comprising a cover plate body having a bottom surface for facing a cell pack and a top surface opposite to the bottom surface, the cover plate body being provided with a liquid injection hole penetrating through the top surface and the bottom surface; at least a portion of the bottom surface is configured as a flow guide surface, the flow guide surface being adjacent to the liquid injection hole and further being inclined away from the top surface from the liquid injection hole.

2. The cell cover plate of claim 1, wherein, The flow guide surface is a curved surface and surrounds the liquid injection hole, the liquid injection hole being located closer to the top surface than any position on the flow guide surface; or the flow guide surface is a conical surface, the liquid injection hole being located at the top of the conical surface.

3. The cell cover plate of claim 2, wherein, A plurality of liquid injection holes are provided, and the bottom surface is formed with the flow guide surface at a position corresponding to each of the liquid injection holes.

4. The cell cover plate of claim 2, wherein, The cover plate body comprises a cover body and an insulation plate fixed to the cover body, a surface of the cover body away from the insulation plate forming the top surface, and a surface of the insulation plate away from the cover body forming the bottom surface; The liquid injection hole penetrates through the cover body and the insulation plate, and the bottom surface is formed with the flow guide surface at the liquid injection hole.

5. The cell cover plate of claim 4, wherein, The insulation plate comprises a positive electrode insulation plate having a first bottom surface for facing the cell pack and a negative electrode insulation plate having a second bottom surface for facing the cell pack, the first bottom surface and the second bottom surface together forming the bottom surface; The liquid injection hole penetrates through one of the positive electrode insulation plate and the negative electrode insulation plate, the first bottom surface is formed with a first flow guide surface, and the second bottom surface is formed with a second flow guide surface, the first flow guide surface and the second flow guide surface together forming the flow guide surface.

6. The cell cover plate of claim 4, wherein, The insulation plate comprises a positive electrode insulation plate having a first bottom surface for facing the cell pack and a negative electrode insulation plate having a second bottom surface for facing the cell pack, the first bottom surface and the second bottom surface together forming the bottom surface; At least one liquid injection hole penetrates through the positive electrode insulation plate and the negative electrode insulation plate respectively, and the first bottom surface and the second bottom surface are formed with the flow guide surface at the respective corresponding liquid injection hole.

7. The electric cell cover plate according to any one of claims 1-6, both sides of the bottom surface in the length direction further protrude with reinforcing bosses, the reinforcing bosses having a guide surface for facing the cell pack, the guide surface being inclined and having opposite proximal side and distal side; The proximal side is closer to the liquid injection hole than the distal side, and the proximal side is closer to the top surface than the distal side.

8. The cell cover plate of any of claims 4-6, wherein, The flow guide surface further recesses with a flow guide groove, one end of the flow guide groove being in communication with the liquid injection hole, and the other end extending away from the liquid injection hole.

9. The electric cell cover plate according to claim 8, the bottom surface further recesses with an explosion-proof hole for mounting an explosion-proof valve, and the flow guide groove is in communication with the explosion-proof hole.

10. The cell cover plate of claim 8, wherein, The depth of the flow guide groove is greater than or equal to one third of the thickness of the insulation plate, and less than or equal to two thirds of the thickness of the insulation plate.

11. An electric cell comprising a housing having a mounting cavity and a cavity opening in communication with the mounting cavity, a cell pack mounted in the mounting cavity, and the cell cover plate of any one of claims 1-10 covering the cavity opening.

12. A battery pack comprising the electric cell of claim 11.

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