Cover plate structure and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a cover plate structure and a battery, the cover plate structure comprises: a plate body, which is provided with a liquid injection hole; the insulating supporting piece is arranged on one side of the plate body; a flow guide part is formed on the insulating supporting piece, the flow guide part extends from one side close to the middle of the insulating supporting piece to one side close to the edge of the insulating supporting piece, and the flow guide part gradually inclines downwards in the Z direction in the extending process; and the projection of the liquid injection hole towards the insulating support piece falls into the range of the flow guide part. According to the cover plate structure provided by the utility model, when the electrolyte is injected from the liquid injection hole, the electrolyte can be guided by the flow guide part, so that the electrolyte is prevented from directly impacting a pole group to damage a pole piece, and meanwhile, metal chips and burrs scraped off in a rubber nail assembling process can be blocked by the flow guide part; and scraped metal chips and burrs are prevented from directly falling into the pole group, so that the product yield is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a cover plate structure and a battery. Background Art

[0002] The battery mainly realizes the sealing protection of the battery core electrode group through the welding method of the cover plate and the shell. After the cover plate and the shell are sealed, the battery core needs to be filled with liquid. In the related art, a liquid injection hole is opened on a light aluminum plate, and during the liquid injection process, the electrolyte sequentially passes through the liquid injection hole of the light aluminum plate and the lower plastic to complete the infiltration of the battery core electrode group. The lower plastic located below the liquid injection hole usually needs to be provided with a through hole to ensure the smooth passage of the electrolyte. However, during the liquid injection process, the electrolyte will impact the electrode group after passing through the through hole, resulting in damage to the electrode sheet.

[0003] In addition, after the battery core is filled with liquid, the liquid injection hole needs to be sealed. In the related art, it is usually divided into two processes. First, a rubber nail is used for the first sealing, and then the second sealing is realized through the aluminum nail welding method. However, during the assembly process of the rubber nail, it mainly enters the liquid injection hole by being pressed by equipment. In this process, it is easy to scrape off the metal chips and burrs on the inner wall of the liquid injection hole and fall into the battery core electrode group, which is likely to cause internal short circuit failure of the battery core. Summary of the Utility Model

[0004] In view of this, the utility model provides a cover plate structure and a battery to solve the problems that the electrolyte is easy to impact the electrode group during the liquid injection process, and the metal chips and burrs on the inner wall of the liquid injection hole are easy to fall into the battery core electrode group.

[0005] In the first aspect, the utility model provides a cover plate structure, including:

[0006] A plate body, on which a liquid injection hole is opened;

[0007] An insulating support member is arranged on one side of the plate body; the insulating support member is formed with a diversion part, and the diversion part extends from one side close to the middle of the insulating support member to the side close to the edge of the insulating support member, and during the extension process, the diversion part is gradually inclined downward along the Z direction;

[0008] The projection of the liquid injection hole towards the insulating support member falls within the range of the diversion part.

[0009] Beneficial effects: The cover plate structure provided by the embodiment of the present utility model has a diversion portion formed on the insulating support member, and the projection of the liquid injection hole towards the insulating support member falls within the range of the diversion portion. Thus, when the electrolyte is injected through the liquid injection hole, it can be guided by the diversion portion, avoiding the direct impact of the electrolyte on the electrode group and causing damage to the electrode sheet. At the same time, the metal chips and burrs scraped off during the assembly of the rubber nails will also be blocked by the diversion portion, preventing the scraped metal chips and burrs from directly falling into the electrode group and improving the product yield. In addition, the diversion portion is inclined downward from the side close to the middle of the insulating support member towards the side close to the edge of the insulating support member; thereby enabling the diversion portion to guide the electrolyte to flow towards the side close to the edge of the insulating support member, that is, guiding the electrolyte to flow towards the side of the electrode group, guiding the flow path of the electrolyte, further avoiding the direct impact of the electrolyte on the electrode group, and after the electrolyte flows towards the side of the electrode group, it can flow along the side of the electrode group to the bottom of the battery cell housing, and infiltrate the electrode group by the way of the electrolyte rising from the bottom, improving the infiltration rate of the electrode group.

[0010] In an optional embodiment, a toothed structure is formed on the side of the diversion portion facing the liquid injection hole.

[0011] Beneficial effects: By forming a toothed structure on the side of the diversion portion facing the liquid injection hole, after the electrolyte flows towards the diversion portion, the flow rate of the electrolyte can be buffered by the toothed structure, preventing the electrolyte from falling too fast and causing impact on the bottom electrode group.

[0012] In an optional embodiment, the diversion portion extends along the X direction from the side close to the middle of the insulating support member towards the side close to the edge of the insulating support member, and the diversion portion is gradually inclined downward along the Z direction during the extension process.

[0013] Beneficial effects: By extending the diversion portion along the X direction from the side close to the middle of the insulating support member towards the side close to the edge of the insulating support member, and the diversion portion is gradually inclined downward along the Z direction during the extension process, the diversion portion can guide the electrolyte towards the edge in the length direction of the battery, realizing the flow of the electrolyte towards the side of the electrode group along the X direction, and it can flow along the side of the electrode group to the bottom of the battery cell housing.

[0014] In an optional embodiment, a buffer cavity is formed relatively below the liquid injection hole on the insulating support member, and the diversion portion forms the bottom wall of the buffer cavity.

[0015] Beneficial effects: After the electrolyte is injected through the liquid injection hole, it can first enter the buffer cavity formed relatively below the liquid injection hole, thereby slowing down the flow rate of the electrolyte. At the same time, since the diversion portion forms the bottom wall of the buffer cavity, it can further slow down the flow rate of the electrolyte, preventing the electrolyte from falling too fast and causing impact on the bottom electrode group.

[0016] In an optional embodiment, the insulating support is further provided with a liquid outlet, and the liquid outlet penetrates the side wall of the insulating support along the X direction;

[0017] The liquid outlet is communicated with the buffer chamber.

[0018] Beneficial effect: By penetrating the side wall of the insulating support along the X direction to form a liquid outlet, and making the liquid outlet communicate with the buffer chamber, the liquid outlet can be used as an outlet for the electrolyte to guide the flow direction of the electrolyte, ensuring that the electrolyte flows downward from the side of the insulating support in the X direction to the bottom of the shell, and realizing the electrolyte flow to the side of the electrode group along the X direction, and can flow along the side of the electrode group to the bottom of the battery shell.

[0019] In an optional embodiment, the liquid outlet is arranged at the edge of the insulating support along the X direction; and the lower edge of the liquid outlet is arranged lower than the relatively lower end of the guide portion.

[0020] Beneficial effect: Since the lower edge of the liquid outlet is arranged lower than the relatively lower end of the guide part, it is possible to avoid the electrolyte from remaining in the buffer cavity and improve the utilization rate of the electrolyte.

[0021] In a second aspect, the utility model further provides a battery, comprising:

[0022] case;

[0023] and a cover plate structure as described above which is arranged on the opening of the shell; the shell and the cover plate structure together enclose a receiving cavity;

[0024] The pole group is arranged in the accommodating cavity.

[0025] In an optional embodiment, the battery further comprises: an insulating sheet, arranged in contact with the side wall surface of the electrode group along the X direction;

[0026] The edge of the insulating support member along the X direction is recessed to form a clearance groove, and the clearance groove is suitable for accommodating the insulating sheet.

[0027] Beneficial effect: A recessed groove is formed on the edge of the insulating support along the X direction, and the recessed groove is suitable for accommodating the insulating sheet. After the flow guide guides the electrolyte to flow toward the side of the electrode group, the liquid outlet serves as the electrolyte outlet, further allowing the electrolyte to flow downward along the insulating sheet in the direction of gravity. The electrolyte can flow toward the side of the electrode group along the X direction, and can flow along the side of the insulating sheet to the bottom of the battery cell shell, further preventing the electrolyte from causing impact damage to the electrode group. At the same time, the metal chips and burrs scraped off during the assembly of the rubber nails will also be intercepted by the flow guide. Even if some metal chips and burrs follow the flow of the electrolyte, they can still be isolated by the insulating sheet and will not fall into the electrode group, thereby improving the product yield.

[0028] In an optional embodiment, the clearance groove is formed relatively below the liquid outlet.

[0029] Beneficial effects: After the insulating sheet is disposed in the relief groove, it can ensure that the electrolyte flowing out from the liquid outlet smoothly flows between the insulating sheet and the housing, avoiding the impact damage of the electrolyte on the electrode group, and ensuring that metal chips and burrs can be separated by the insulating sheet and will not fall into the electrode group.

[0030] In an alternative embodiment, the insulating sheet is heat-melted and connected to the relief groove of the insulating support. Description of the Drawings

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a top view of the cover plate structure of the present invention;

[0033] Figure 2 It is Figure 1 a schematic diagram of the A-A cross-section in

[0034] Figure 3 It is a partially enlarged view of the cross-section of the battery of the present invention;

[0035] Figure 4 It is a top view of the insulating support of the present invention;

[0036] Figure 5 It is Figure 4 a partially enlarged view of the B-B cross-section in

[0037] Figure 6 It is a top view of another insulating support of the present invention;

[0038] Description of the Reference Numerals:

[0039] 1. Plate body; 11. Liquid injection hole;

[0040] 2. Insulating support; 21. Flow guiding part; 22. Liquid outlet part; 23. Relief groove; 26. Buffer cavity; 3. Electrode group; 4. Insulating sheet. Detailed Embodiments

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0042] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0043] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0044] In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0045] The battery mainly realizes the sealing protection of the battery cell pole group through the welding method of the cover plate and the housing. The cover plate is mainly composed of components such as pole columns, light aluminum plates, and lower plastics. After the cover plate and the housing are sealed, the battery cell needs to be filled with liquid. In related technologies, a liquid injection hole is opened on the light aluminum plate, and during the liquid injection process, the electrolyte sequentially passes through the liquid injection hole of the light aluminum plate and the lower plastic to complete the infiltration of the battery cell pole group. As a way to facilitate the smooth passage of the electrolyte through the lower plastic, through holes are opened in the lower plastic located below the liquid injection hole to ensure the smooth passage of the electrolyte. However, during the liquid injection process, when the electrolyte passes through the through holes, it will impact the pole group and cause damage to the pole pieces; as another way, a groove structure is formed at the bottom of the lower plastic, and small through holes are opened in the lower plastic. Although the groove structure can play a certain buffering role for the electrolyte, due to the opening of the small through holes, the impact of the electrolyte on the pole group still cannot be avoided. In addition, after the battery cell is filled with liquid, the liquid injection hole needs to be sealed. In related technologies, it is usually divided into two processes. First, a rubber nail is used for the first sealing, and then the second sealing is achieved through the aluminum nail welding method. However, during the assembly process of the rubber nail, it mainly enters the liquid injection hole by being pressed by equipment. During this process, it is easy to scrape off the metal chips and burrs on the inner wall of the liquid injection hole and fall into the battery cell pole group, which is likely to cause internal short-circuit defects of the battery cell.

[0046] The cover plate structure provided by the embodiment of the present invention can overcome the problem of the impact of the electrolyte on the pole group during the liquid injection process. By guiding the flow path of the electrolyte, the electrolyte is diverted to the side of the pole group to avoid the impact damage caused when the electrolyte flows directly against the pole group. At the same time, the metal chips and burrs scraped off during the assembly process of the rubber nail will also be isolated and will not fall into the pole group, improving the product yield.

[0047] The following combines Figures 1 to 6 , and describes the embodiments of the present invention.

[0048] According to an embodiment of the present invention, on the one hand, a cover plate structure is provided, including:

[0049] A plate body 1, on which a liquid injection hole 11 is opened;

[0050] An insulating support member 2, arranged on one side of the plate body 1; the insulating support member 2 is formed with a diversion portion 21, and the diversion portion 21 extends from one side close to the middle of the insulating support member 2 towards one side close to the edge of the insulating support member 2, and during the extension process, the diversion portion 21 is gradually inclined downward along the Z direction;

[0051] The projection of the liquid injection hole 11 towards the insulating support member 2 falls within the range of the diversion portion 21.

[0052] The cover plate structure of this embodiment can be disposed on the opening of the housing. The housing and the cover plate structure jointly enclose a containing cavity, and the containing cavity is suitable for placing the electrode group 3. By providing a liquid injection hole 11 on the plate body 1, after the cover plate and the housing are sealed, the electrolyte can be injected into the containing cavity of the battery through the liquid injection hole 11 to realize the infiltration of the electrode group.

[0053] In this embodiment, the liquid injection hole 11 can be specifically provided on one side of the plate body 1 close to the edge along the X direction.

[0054] In this embodiment, the insulating support 2 is disposed relatively below the plate body 1. The insulating support 2 is formed with a diversion portion 21, and the projection of the liquid injection hole 11 facing the insulating support 2 falls within the range of the diversion portion 21. Thus, when the electrolyte is injected through the liquid injection hole 11, it can be guided by the diversion portion 21 to avoid the electrolyte directly impacting the electrode group 3 and causing damage to the electrode plate.

[0055] Specifically in this embodiment, the diversion portion 21 is inclined downward from one side close to the middle of the insulating support 2 toward one side close to the edge of the insulating support 2, so that the diversion portion 21 can guide the electrolyte to flow toward one side close to the edge of the insulating support 2, that is, guide the electrolyte to flow toward the side of the electrode group 3, thereby avoiding the electrolyte directly impacting the electrode group 3 and causing damage to the electrode plate. As an alternative implementation form, as shown in Figure 4 The diversion portion 21 extends along the X direction from one side close to the middle of the insulating support 2 toward one side close to the edge of the insulating support 2, and the diversion portion 21 is gradually inclined downward along the Z direction during the extension process. As another alternative implementation form, as shown in Figure 6 The diversion portion 21 extends along the Y direction from one side close to the middle of the insulating support 2 toward one side close to the edge of the insulating support 2, and the diversion portion 21 is gradually inclined downward along the Z direction during the extension process.

[0056] Wherein, the X direction, Y direction, and Z direction are all the directions shown in the appendix Figures 1 - 6 shown.

[0057] The cover structure provided by the embodiment of the present utility model is formed with a diversion portion 21 on the insulating support 2, and the projection of the liquid injection hole 11 towards the insulating support 2 falls within the range of the diversion portion 21. When the electrolyte is injected from the liquid injection hole 11, it can be guided by the diversion portion 21, avoiding direct impact of the electrolyte on the electrode group 3 and causing damage to the electrode sheets. At the same time, the metal chips and burrs scraped off during the assembly of the rubber nails will also be blocked by the diversion portion 21, preventing the scraped metal chips and burrs from directly falling into the electrode group and improving the product yield. In addition, the diversion portion 21 is inclined downward from one side close to the middle of the insulating support 2 towards one side close to the edge of the insulating support 2; thus enabling the diversion portion 21 to guide the electrolyte to flow towards the side close to the edge of the insulating support 2, that is, to guide the electrolyte to flow towards the side of the electrode group 3, guiding the flow path of the electrolyte, further avoiding direct impact of the electrolyte on the electrode group 3. After the electrolyte flows towards the side of the electrode group 3, it can flow along the side of the electrode group 3 to the bottom of the battery cell housing, and the electrode group is infiltrated by the way of the electrolyte rising from the bottom, improving the infiltration rate of the electrode group.

[0058] In some embodiments, as shown in Figure 3 a tooth-like structure is formed on the side of the diversion portion 21 facing the liquid injection hole 11.

[0059] By forming a tooth-like structure on the side of the diversion portion 21 facing the liquid injection hole 11, after the electrolyte flows towards the diversion portion 21, the tooth-like structure can buffer the flow rate of the electrolyte, preventing the electrolyte from falling too fast and impacting the bottom electrode group.

[0060] In this embodiment, the extending direction of the tooth-like structure is perpendicular to or angled with the flowing direction of the electrolyte, thus effectively slowing down the flow rate of the electrolyte.

[0061] In some embodiments, as shown in Figure 3 the diversion portion 21 extends from one side close to the middle of the insulating support 2 towards one side close to the edge of the insulating support 2 along the X direction, and the diversion portion 21 is gradually inclined downward along the Z direction during the extension process.

[0062] By extending the diversion portion 21 from one side close to the middle of the insulating support 2 towards one side close to the edge of the insulating support 2 along the X direction, and the diversion portion 21 is gradually inclined downward along the Z direction during the extension process, the diversion portion 21 can guide the electrolyte towards the edge in the length direction of the battery, realizing the flow of the electrolyte towards the side of the electrode group 3 along the X direction, and it can flow along the side of the electrode group 3 to the bottom of the battery cell housing.

[0063] In some embodiments, as shown in Figure 5 a buffer cavity 26 is formed under the insulating support 2 relative to the liquid injection hole 11, and the diversion portion 21 forms the bottom wall of the buffer cavity 26.

[0064] After the electrolyte is injected through the liquid injection hole 11, it can first enter the buffer chamber 26 formed relatively below the liquid injection hole 11, thereby slowing down the flow rate of the electrolyte. At the same time, the diversion part 21 forms the bottom wall of the buffer chamber 26, which can further slow down the flow rate of the electrolyte and prevent the electrolyte from falling too fast and impacting the bottom electrode group.

[0065] In some embodiments, in combination with Figure 3 、 Figure 5 As shown, the insulating support 2 is further provided with a liquid outlet part 22, and the liquid outlet part 22 penetrates through the side wall of the insulating support 2 along the X direction;

[0066] The liquid outlet part 22 is communicated with the buffer chamber 26.

[0067] By forming the liquid outlet part 22 through the side wall of the insulating support 2 along the X direction and making the liquid outlet part 22 communicate with the buffer chamber 26, the liquid outlet part 22 can be used as the outlet of the electrolyte, so as to guide the flow direction of the electrolyte, ensure that the electrolyte flows down from the side surface of the insulating support 2 in the X direction to the bottom of the housing, realize the flow of the electrolyte to the side surface of the electrode group 3 in the X direction, and can flow along the side surface of the electrode group 3 to the bottom of the battery cell housing.

[0068] In some embodiments, in combination with Figure 3 、 Figure 5 As shown, the liquid outlet part 22 is arranged at the edge of the insulating support 2 along the X direction; and the lower edge of the liquid outlet part 22 along the Z direction is lower than the relatively low end of the diversion part 21.

[0069] Since the lower edge of the liquid outlet part 22 is lower than the relatively low end of the diversion part 21, the residual of the electrolyte in the buffer chamber 26 can be avoided, and the utilization rate of the electrolyte can be improved.

[0070] According to an embodiment of the present invention, on the other hand, a battery is further provided, including:

[0071] A housing;

[0072] And a cover plate structure as described above covering the opening of the housing; the housing and the cover plate structure jointly enclose a containing cavity;

[0073] An electrode group 3, arranged in the containing cavity.

[0074] In the battery provided by the embodiment of the utility model, a flow guide 21 is formed on the insulating support 2, and the projection of the injection hole 11 toward the insulating support 2 falls within the range of the flow guide 21, so that when the electrolyte is injected from the injection hole 11, it can be guided by the flow guide 21 to prevent the electrolyte from directly impacting the electrode group 3 and causing damage to the electrode sheet. At the same time, metal chips and burrs scraped off during the assembly process of the rubber nails will also be blocked by the flow guide 21 to prevent the scraped metal chips and burrs from directly falling into the electrode group, thereby improving the product yield. In addition, the guide portion 21 is arranged to be inclined downward from the side close to the middle of the insulating support 2 toward the side close to the edge of the insulating support 2; thereby, the guide portion 21 can guide the electrolyte to flow toward the side close to the edge of the insulating support 2, that is, guide the electrolyte to flow toward the side of the electrode group 3, guide the flow path of the electrolyte, and further avoid the electrolyte directly impacting the electrode group 3, so that after the electrolyte flows to the side of the electrode group 3, it can flow along the side of the electrode group 3 to the bottom of the battery cell shell, and the electrode group is infiltrated by the electrolyte rising from the bottom, thereby improving the electrode group infiltration rate.

[0075] In some embodiments, in combination Figure 3 As shown, the battery further includes: an insulating sheet 4, which is attached to the side wall surface of the electrode group 3 along the X direction;

[0076] The edge of the insulating support member 2 along the X direction is recessed to form a clearance groove 23 , and the clearance groove 23 is suitable for accommodating the insulating sheet 4 .

[0077] The insulating sheet 4 is arranged in close contact with the side wall surface of the pole group 3 along the X direction to achieve the spacing between the pole group 3 and the shell, avoid short circuit, and improve safety performance.

[0078] The edge of the insulating support 2 along the X direction is recessed to form a clearance groove 23, which is suitable for accommodating the insulating sheet 4, so that after the electrolyte is guided by the guide portion 21 to flow toward the side of the electrode group 3, the liquid outlet portion 22 serves as the electrolyte outlet, and the electrolyte further flows downward along the insulating sheet 4 along the gravity direction. The electrolyte flows toward the side of the electrode group 3 along the X direction, and can flow along the side of the insulating sheet 4 to the bottom of the battery cell housing, further preventing the electrolyte from causing impact damage to the electrode group.

[0079] At the same time, metal chips and burrs scraped off during the rubber nail assembly process will also be intercepted by the guide part 21. Even if some metal chips and burrs flow with the electrolyte, they can still be isolated by the insulating sheet 4 and will not fall into the electrode group, thereby improving the product yield.

[0080] In some embodiments, in combination Figure 5 As shown, the clearance groove 23 is formed relatively below the liquid outlet portion 22 .

[0081] Ensure that after the insulating sheet 4 is disposed in the relief groove 23, the electrolyte flowing out from the liquid outlet portion 22 can smoothly flow between the insulating sheet 4 and the housing, preventing the electrolyte from impacting and damaging the electrode group, and ensuring that metal chips and burrs can be separated by the insulating sheet 4 and will not fall into the electrode group.

[0082] In some embodiments, the insulating sheet 4 is thermally fused to the relief groove 23 of the insulating support 2.

[0083] Ensure that the insulating sheet 4 and the insulating support 2 are firmly fixed.

[0084] Obviously, the above embodiments are only examples for clear illustration and not limitations on the implementation manners. Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A cover plate structure, characterized in that: include: A plate body, on which a liquid injection hole is provided; An insulating support member is arranged on one side of the plate body; the insulating support member is formed with a guide portion, the guide portion extends from a side close to the middle of the insulating support member toward a side close to the edge of the insulating support member, and the guide portion is gradually inclined downward along the Z direction during the extension process; A projection of the liquid injection hole toward the insulating support member falls within the range of the guide portion.

2. The cover plate structure according to claim 1, characterized in that: A tooth-shaped structure is formed on one side of the flow guide portion facing the liquid injection hole.

3. The cover plate structure according to claim 1, characterized in that: The guide portion extends along the X direction from a side close to the middle of the insulating support member toward a side close to the edge of the insulating support member, and during the extension process, the guide portion is gradually inclined downward along the Z direction.

4. The cover plate structure according to claim 3, characterized in that: The insulating support is located relatively below the liquid injection hole to form a buffer cavity, and the guide portion forms the bottom wall of the buffer cavity.

5. The cover plate structure according to claim 4, characterized in that: The insulating support member is further provided with a liquid outlet portion, and the liquid outlet portion penetrates the side wall of the insulating support member along the X direction; The liquid outlet is communicated with the buffer chamber.

6. The cover plate structure according to claim 5, characterized in that: The liquid outlet is arranged at the edge of the insulating support member along the X direction; and the lower edge of the liquid outlet along the Z direction is arranged lower than the relatively lower end of the guide portion.

7. A battery, characterized in that: include: case; and a cover plate structure as claimed in any one of claims 1 to 6 above, which is arranged on the opening of the shell; the shell and the cover plate structure together enclose a receiving cavity; The pole group is arranged in the accommodating cavity.

8. The battery according to claim 7, characterized in that The battery further comprises: an insulating sheet, which is attached to the side wall surface of the electrode group along the X direction; The edge of the insulating support member along the X direction is recessed to form a clearance groove, and the clearance groove is suitable for accommodating the insulating sheet.

9. The battery according to claim 8, characterized in that The clearance groove is formed relatively below the liquid outlet portion.

10. The battery according to claim 8, characterized in that The insulating sheet is connected to the clearance groove of the insulating support member by thermal melting.

Images