CN219959198U

CN219959198U - Insulation board, cover plate assembly, battery, liquid injection head and liquid injection equipment

Info

Publication number: CN219959198U
Application number: CN202321455918.6U
Authority: CN
Inventors: 黄金海; 舒宽金; 贺孝武; 安苏礼; 王俊敏; 何巍
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2023-06-08
Filing date: 2023-06-08
Publication date: 2023-11-03
Anticipated expiration: 2033-06-08

Abstract

The utility model discloses an insulating plate, a cover plate assembly, a battery, a liquid injection head and liquid injection equipment. The body plate structure is arranged on one side of the cover plate main body, the sealing structure comprises a sealing part and a connecting part, the sealing part is arranged on one side, close to the cover plate main body, of the body plate structure, the sealing part is used for sealing the liquid injection hole, the connecting part is connected between the sealing part and the body plate structure, and the connecting part is elastic. Through setting up seal structure in body plate structure, can confirm seal structure's assembly gesture through confirming the holistic assembly gesture of insulation board, consequently seal structure holistic thickness can be less to make seal portion locate one side that is close to the apron main part of body plate structure, thereby can reduce seal structure wholly to the occupation of the inner space of battery, promote electric core energy density and the security of the battery including this insulation board.

Description

Insulation board, cover plate assembly, battery, liquid injection head and liquid injection equipment

Technical Field

The utility model relates to the technical field of batteries, in particular to an insulating plate, a cover plate assembly, a battery, a liquid injection head and liquid injection equipment.

Background

In order to supply electrolyte to pour into, the apron main part of power battery is equipped with the notes liquid hole usually, and after annotating the liquid and accomplishing, in order to prevent the weeping, in the related art, often seal notes liquid hole through setting up sealed micelle in annotating liquid hole, and in order to make the gesture when sealed micelle is nailed into notes liquid hole have higher controllability, in order to guarantee the manufacturing yield of battery, in other words, the thickness of sealed micelle is often not less than 3.5mm in the industry, in other words, the thickness of sealed micelle is often greater than the thickness of apron subassembly main part, lead to sealed micelle to pour into behind the notes liquid hole, the one end of sealed micelle gets into the battery inside, the battery of crowding the battery inside sets up the space, bring the problem that electric core energy density reduces, and the electric core is pressed, the problem that battery security reduces.

Disclosure of Invention

The first object of the present utility model is to: the utility model provides an insulation board, the battery core that the seal structure that this insulation board included took up sets up the space little in the inside battery, can promote battery core energy density and security.

A second object of the present utility model is to: the utility model provides a apron subassembly, it can realize the sealed of annotating the liquid hole through seal structure through setting up foretell insulation board, reduces the occupation of apron subassembly whole to the inside electric core setting space of battery.

A third object of the present utility model is to: the battery is provided, the cover plate assembly is arranged, occupation of the whole battery core arrangement space inside the battery can be reduced, and the battery core energy density and the safety of the battery are improved.

A fourth object of the present utility model is to: the utility model provides a annotate liquid head, this annotate liquid head can annotate liquid to above-mentioned battery inside, and annotate liquid in-process and receive seal structure's hindrance little.

A fifth object of the present utility model is to: the utility model provides a annotate liquid equipment, it is through setting up foretell notes liquid head, can annotate liquid to above-mentioned battery inside, and annotate liquid in-process and receive seal structure's hindrance little.

In order to achieve the purpose, the utility model adopts the following technical scheme:

in a first aspect, there is provided a cap plate assembly for a battery including a cap plate body and an insulating plate, the cap plate body being provided with a liquid injection hole, the insulating plate comprising:

The body plate structure is arranged on one side of the cover plate main body; the method comprises the steps of,

the sealing structure comprises a sealing part and a connecting part, wherein the sealing part is arranged on one side, close to the cover plate main body, of the body plate structure, the sealing part is used for sealing the liquid injection hole, the connecting part is connected between the sealing part and the body plate structure, and the connecting part has elasticity.

As a preferable technical scheme of the insulating plate, a sealing surface is arranged on one side of the sealing part far away from the body plate structure, and is used for abutting against the cover plate main body so as to seal the liquid injection hole;

the height of the connecting part protruding out of the body plate structure is smaller than or equal to the height of the sealing surface protruding out of the body plate structure.

As a preferable embodiment of the insulating plate, the sealThe cover has an outer envelope circle diameter R, R is more than or equal to 4mm and less than or equal to 8mm, and/or the area of the sealing surface is S1, and the radius of the liquid injection hole is a, S1/(pi a) is more than or equal to 2 ² ) Less than or equal to 5, wherein the unit of the area S1 is mm ² Radius a is in mm.

As a preferable technical scheme of the insulating plate, the sealing surface is provided with a first central axis, the sealing structure further comprises an alignment part, the alignment part is convexly arranged on the sealing surface and is used for extending into the liquid injection hole, so that the first central axis of the sealing surface is overlapped with a second central axis of the liquid injection hole.

As a preferable embodiment of the insulating plate, the outer periphery of the alignment portion has a guide surface for guiding the alignment portion to extend into the liquid injection hole.

As a preferable technical scheme of the insulating plate, the connecting portion is of a strip-shaped structure which is at least partially bent, two opposite ends of the connecting portion are respectively connected with the sealing portion and the body plate structure, the connecting portion is multiple, and the connecting portion is arranged around the sealing portion at intervals.

As a preferable technical scheme of the insulating plate, the connecting portion is formed into a strip-shaped structure which is bent and protruded away from the main body plate structure, the connecting portion has a height H along a direction perpendicular to the sealing surface, and the connecting portion has a length L along a direction parallel to the sealing surface, wherein H/L is more than or equal to 0.2 and less than or equal to 1.5.

As a preferable technical scheme of the insulating plate, the connecting part has a thickness along a direction perpendicular to the sealing surface, and the connecting part has a structure with unequal thickness; and/or the number of the groups of groups,

the connecting portion has a width in a direction parallel to the sealing surface, and is of a structure of unequal widths.

As a preferable technical scheme of the insulating plate, when the connecting part is of a structure with unequal thickness, the minimum thickness is t1, and t1 is more than or equal to 0.2mm and less than or equal to 1mm; and/or the number of the groups of groups,

when the connecting part is of a structure with unequal widths, the minimum width is t2, and t2 is more than or equal to 0.2mm and less than or equal to 1mm.

As a preferable technical scheme of the insulating plate, a plurality of connecting portions are equidistantly arranged around the sealing portion.

As a preferable technical scheme of the insulating plate, the surface of the body plate structure is convexly provided with reinforcing ribs, and the connecting part is connected between the sealing part and the reinforcing ribs.

As a preferable embodiment of the insulating plate, the sealing structure is formed integrally with the body plate structure.

As a preferable technical scheme of the insulating plate, the body plate structure is provided with a first through hole, the first through hole is used for corresponding to the liquid injection hole, and the sealing structure is arranged on the first through hole.

In a second aspect, there is provided a cap plate assembly for a battery, the cap plate assembly comprising:

the cover plate main body is provided with a liquid injection hole; the method comprises the steps of,

the insulating plate according to the first aspect, wherein the body plate structure is disposed on one side of the cover plate main body, the sealing portion is disposed on one side of the body plate structure, which is close to the cover plate main body, and the sealing portion is capable of sealing the liquid injection hole.

In a third aspect, a battery is provided, the battery includes a housing, a battery cell, and a cover plate assembly according to the second aspect, where one side of the housing has an opening, the battery cell is disposed in the housing, the cover plate assembly covers the opening, and the cover plate body is located on a side of the insulating plate away from the battery cell.

In a fourth aspect, there is provided a liquid injection head for injecting liquid into the interior of the battery according to the above third aspect, the liquid injection head comprising:

the main body part is internally provided with a first channel and is used for being connected with the cover plate main body in a sealing way so as to seal the liquid injection hole; the method comprises the steps of,

the extension part is arranged on the main body part in a protruding mode, the extension part is used for penetrating through the liquid injection hole, the top end of the extension part is used for propping against the sealing part and entering the inside of the shell, a channel opening is formed in the periphery of the top end, and the channel opening is communicated with the first channel.

As a preferable technical scheme of the liquid injection head, the protruding height of the extension part protruding out of the main body part is c, and c is more than or equal to 0.5mm and less than or equal to 1mm.

As a preferable technical solution of the liquid injection head, the top end has a top surface far from the main body part, and the top surface is used for propping against the sealing part and entering the interior of the battery;

The top surface is offered the second passageway, the second passageway intercommunication in first passageway, the passageway opening is offered in the periphery on top and the top surface, just the passageway opening intercommunication in the second passageway.

As a preferable technical scheme of the liquid injection head, the plurality of the channel openings are arranged at intervals along the circumferential direction of the top end, and the plurality of the channel openings are communicated with the first channel.

As a preferable technical scheme of the liquid injection head, the plurality of first channels are arranged at intervals, at least one first channel is a liquid injection channel, and the rest at least one first channel is an air extraction channel;

the liquid injection device comprises a plurality of liquid injection channels, a plurality of liquid injection channels and a plurality of liquid extraction channels, wherein the liquid injection channels are arranged at intervals, at least one liquid injection channel is arranged in the liquid injection channels, the rest at least one liquid injection channel is arranged in the liquid extraction channels, and the liquid extraction channels are communicated with the liquid injection channels.

In a fifth aspect, there is provided a liquid injection apparatus, the liquid injection apparatus including an air extracting device, a liquid injection device and the liquid injection head according to the fourth aspect, where the air extracting device and the liquid injection device are respectively connected to the liquid injection head and respectively connected to the first channels.

The beneficial effects of the utility model are as follows:

through making seal structure include sealing and connect in the connecting portion between sealing and the body plate structure for sealing can seal the liquid hole under the support that has elastic connecting portion, and through setting up seal structure in the body plate structure, in the assembly process, can confirm seal structure's assembly gesture through confirming the holistic assembly gesture of insulation board, thereby guarantee seal structure's assembly yield, consequently seal structure holistic thickness can be less, so that sealing can locate the body plate structure be close to one side of apron main part. And through locating the sealing portion one side that is close to the apron main part of body plate structure, in other words, through locating the sealing portion between body plate structure and the apron main part, can reduce the occupation of the space (i.e. the interior space of battery) of keeping away from apron main part one side of sealing structure whole to body plate structure to can promote electric core energy density and the security of the battery including this insulation board.

Drawings

The utility model is described in further detail below with reference to the drawings and examples.

Fig. 1 is a schematic perspective view of an insulating board according to an embodiment.

Fig. 2 is an enlarged view at P in fig. 1.

Fig. 3 is a schematic diagram illustrating a part of an assembling structure of an insulating plate and a cover main body according to an embodiment.

Fig. 4 is a partial schematic view of an exploded structure of an insulating plate and a cover main body according to an embodiment.

Fig. 5 is a schematic perspective view of a cover assembly according to an embodiment.

Fig. 6 is an exploded view of a cover assembly according to an embodiment.

Fig. 7 is a schematic perspective view of a battery according to an embodiment.

Fig. 8 is a schematic exploded view of a battery according to an embodiment.

Fig. 9 is a schematic perspective view of a liquid injection head according to an embodiment.

Fig. 10 is a schematic bottom view of the injection head according to the embodiment.

Fig. 11 is a cross-sectional view taken along A-A in fig. 10.

Fig. 12 is a schematic view of the structure of the filling head, the cap plate body and the insulating plate (when the filling head is used to fill the battery) according to the embodiment.

Fig. 13 is a schematic sectional view of a structure of a liquid filling head (the liquid filling head performs liquid filling by simultaneously pumping air and filling liquid into the battery) according to an embodiment.

Fig. 14 is a schematic block diagram of a construction of the liquid injection apparatus according to the embodiment.

In the figure:

1. an insulating plate; 10. a body plate structure; 100. reinforcing ribs; 101. a first through hole; 102. a second through hole; 11. a sealing structure; 110. a sealing part; 110a, sealing surfaces; 111. a connection part; 111a, a reduced thickness; 111b, a widening; 112. an alignment part; 112a, a guide surface;

2. A cover plate assembly; 20. a cover plate main body; 200. a liquid injection hole;

3. a battery; 30. a housing; 300. an opening; 31. a battery cell;

4. a liquid injection head; 40. a main body portion; 400. a first channel; 400a, a liquid injection channel; 400b, an air extraction channel; 401. a seal ring; 402. a groove is arranged; 41. an extension; 410. a top end; 410a, top surface; 410b, an outer peripheral surface; 411. a channel opening; 411a, liquid injection opening; 411b, bleed openings; 412. a second channel;

5. a liquid injection device; 50. an air extracting device; 51. and a liquid injection device.

Detailed Description

In order to make the technical problems solved by the present utility model, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

As shown in fig. 1, 2 and 3, the present utility model provides an insulating plate 1, and a cover plate assembly for a battery, wherein the cover plate assembly comprises a cover plate main body 20 and the insulating plate 1, the cover plate main body 20 is provided with a liquid injection hole 200, and the insulating plate 1 comprises a body plate structure 10 and a sealing structure 11. The body plate structure 10 is arranged on one side of the cover plate main body 20, the sealing structure 11 comprises a sealing part 110 and a connecting part 111, the sealing part 110 is arranged on one side of the body plate structure 10 close to the cover plate main body 20, the sealing part 110 is used for sealing the liquid injection hole 200, the connecting part 111 is connected between the sealing part 110 and the body plate structure 10, and the connecting part 111 has elasticity.

By making the sealing structure 11 include the sealing portion 110 and the connection portion 111 connected between the sealing portion 110 and the body plate structure 10, the sealing portion 110 can seal the liquid injection hole 200 under the support of the connection portion 111 having elasticity, even if the sealing portion 110 moves to release the sealing of the liquid injection hole 200 due to the action of the additional external force, after the additional external force disappears, the sealing portion 110 can automatically return to seal to the liquid injection hole 200 under the action of the elastic force of the connection portion 111, in other words, the sealing structure 11 can realize the automatic sealing of the liquid injection hole 200 on the side of the cover plate main body 20 facing the insulating plate 1.

By providing the sealing structure 11 to the body plate structure 10, the assembly posture of the sealing structure 11 can be determined by determining the assembly posture of the whole insulating plate 1 during the assembly process, for example, by determining that the orientation of the side of the insulating plate 1 facing the cap plate main body 20 is correct, so as to determine that the sealing structure 11 provided to the body plate structure 10 is in the correct assembly posture, since the whole insulating plate 1 is relatively large in volume compared to the sealing structure 11, the assembly posture of the whole insulating plate 1 is easy to be confirmed, and the whole insulating plate 1 is easy to be maintained in the correct posture for assembly, so that the assembly yield of the sealing structure 11 is easy to be ensured, and therefore the thickness of the whole sealing structure 11 can be relatively small, so that the sealing portion 110 can be provided on the side of the body plate structure 10 close to the cap plate main body 20. By disposing the sealing portion 110 on the side of the body plate structure 10 close to the lid plate main body 20, in other words, by disposing the sealing portion 110 between the body plate structure 10 and the lid plate main body 20, the occupation of the space (i.e., the internal space of the battery) on the side of the body plate structure 10 away from the lid plate main body 20 by the whole sealing structure 11 can be reduced, and thus the cell energy density and safety of the battery including the insulating plate 1 can be improved.

As shown in fig. 2, 3 and 4, optionally, a side of the sealing portion 110 away from the body plate structure 10 may have a sealing surface 110a, where the sealing surface 110a is used to abut against the cover plate main body 20 to seal the liquid injection hole 200, so as to realize a sealing function of the sealing portion 110 on the liquid injection hole 200.

Further, the height of the connecting portion 111 protruding from the body plate structure 10 is smaller than or equal to the height of the sealing surface 110a protruding from the body plate structure 10, so as to avoid interference between the structure of the connecting portion 111 and the cover plate main body 20, and influence the abutting tightness between the sealing surface 110a and the cover plate main body 20, thereby avoiding influence on the sealing effect of the sealing surface 110a on the liquid injection hole 200.

The inventors have further studied and found that in order to obtain a good sealing effect of the sealing surface 110a on the pouring spout 200, the effective contact area between the sealing surface 110a and the lid main body 20 needs to be large, in other words, the area of the sealing surface 110a needs to be large and large to a certain extent than the opening area of the pouring spout 200 on the lid main body 20. In addition, the larger the area of the sealing surface 110a, the better the sealing effect of the sealing surface 110a on the liquid injection hole 200, but the larger the volume of the sealing portion 110 is, which affects the overall structural compactness of the insulating plate 1, and the larger the support of the connecting portion 111 needs to be provided for the sealing portion 110, so that the higher the requirement on the elastic support performance of the connecting portion 111 is. Therefore, the area of the sealing portion 110 needs to be larger than the opening area of the pouring hole 200 on the surface of the cover main body 20 facing the main body plate structure 10 by a certain degree, but the area of the sealing surface 110a cannot be excessively large.

In the related art, the injection hole 200 is usually a circular hole, and the opening radius of the injection hole 200 on the surface of the cover main body 20 facing the main body plate structure 10 is a, and the radius a may be 1.5mm. Based on this, one alternative, the sealing surface 110a has an outer envelope diameter R that satisfies: r.ltoreq.4 mm.ltoreq.8 mm, for example, the outer envelope diameter R may be 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm or 8mm, etc.

Alternatively, the area of the sealing surface 110a may be S1, the area of the opening of the injection hole 200 on the surface of the cover plate main body 20 facing the main body plate structure 10 may be S2, and the ratio of the area S1 to the area S2 may be: 2.ltoreq.S1/S2.ltoreq.5, and for example, S1/S2 may be: 2. 2.5, 3, 3.5, 4, 4.5 or 5, etc., wherein the units of the area S1 and the area S2 are both mm ² 。

As described above, since the radius of the pouring hole 200 is a, the area s2=pi a ² So that S1/S2 is more than or equal to 2 and S1/(pi a) is more than or equal to 2 and less than or equal to 5 ² ) And less than or equal to 5, wherein the unit of the radius a is mm.

It will be appreciated that for sealing surfaces 110a having the same envelope circle diameter R but different shapes, the area S1 is also different, and in order to make the sealing performance of the sealing surface 110a more desirable, the structural volume of the sealing portion 110 is also more desirable, and alternatively, the envelope circle diameter R of the sealing surface 110a may be made to satisfy: while 4 mm.ltoreq.R.ltoreq.8mm, the area S1 of the sealing surface 110a and the open area S2 of the surface of the cover main body 20 facing the main body plate structure 10 are made to satisfy: S1/S2 is more than or equal to 2 and less than or equal to 5.

Preferably, the sealing surface 110a may be a circular surface, an isosceles surface, or other isosceles surface, and the sealing portion 110 may be a cylindrical, triangular prism, quadrangular prism, penta prism, hexagonal prism, or other cylindrical structure, so that the effective contact area between the sealing surface 110a and the cover plate main body 20 is distributed more uniformly around the liquid injection hole 200, the sealing effect of the sealing surface 110a on the liquid injection hole 200 is more balanced, and the structure of the sealing portion 110 is simpler and easier to manufacture.

Optionally, the sealing surface 110a may have a first central axis M1, the sealing structure 11 may further include an alignment portion 112, where the alignment portion 112 is convexly disposed on the sealing surface 110a, and the alignment portion 112 is configured to extend into the injection hole 200, so that the first central axis M1 of the sealing surface 110a is approximately coincident with the second central axis M2 of the injection hole 200, thereby reducing the offset between the sealing surface 110a and the injection hole 200, making the relative positions of the sealing surface 110a and the injection hole 200 closer to an ideal state in design, making the effective contact area between the sealing surface 110a and the cover main body 20 more balanced around the injection hole 200, and the sealing effect of the sealing surface 110a on the injection hole 200 more balanced.

Preferably, the outer periphery of the alignment portion 112 may have a guiding surface 112a, where the guiding surface 112a is used to guide the alignment portion 112 to extend into the injection hole 200, so that in a case of a certain offset between the alignment portion 112 and the injection hole 200, the alignment portion 112 and the injection hole 200 can be self-aligned by the guiding surface 112a, so that the alignment portion 112 extends into the injection hole 200, and drives the first central axis M1 of the sealing portion 110 to automatically align with the second central axis M2 of the injection hole 200.

Specifically, when there is a certain offset between the alignment portion 112 and the injection hole 200, the guide surface 112a can abut against the hole wall of the injection hole 200 so that the alignment portion 112 extends into the injection hole 200 due to the reaction force of the hole wall of the injection hole 200.

For example, the alignment portion 112 may be a truncated cone structure protruding from the sealing surface 110a, and the alignment portion 112 uses the first central axis M1 as an axis, and an outer peripheral surface of the truncated cone structure is formed as a guiding surface 112a, so that the alignment portion 112 can realize a function of driving the sealing portion 110 to automatically align, and the structure of the alignment portion 112 is simple.

In other examples, the alignment portion 112 may also be a ring structure disposed around the first central axis M1, and an outer periphery of the ring structure is formed as the guide surface 112a, or the alignment portion 112 may be plural, the plural alignment portions 112 are disposed around the first central axis M1 at intervals, and outer surfaces of the plural alignment portions 112 facing away from the first central axis M1 respectively are formed as the guide surfaces 112a. It can be understood that, as long as the alignment portion 112 can be automatically aligned with and extend into the liquid injection hole 200, the first central axis M1 of the sealing portion 110 is driven to automatically align with the second central axis M2 of the liquid injection hole 200, and the structure of the alignment portion 112 is not particularly limited in this embodiment.

Alternatively, the connection portion 111 may be connected between the outer periphery of the sealing portion 110 and the body plate structure 10, so that the connection portion 111 and the sealing portion 110 are more compact in structure in a direction perpendicular to the sealing surface 110a, and the sealing structure 11 is more suitable for being disposed between the body plate structure 10 and the cover plate main body 20.

Alternatively, the connecting portion 111 may be a strip-shaped structure that is at least partially curved, two opposite ends of the connecting portion 111 are respectively connected to the sealing portion 110 and the body plate structure 10, and the connecting portion 111 may be multiple, and multiple connecting portions 111 are disposed around the sealing portion 110 at intervals, so that by the at least partially curved structure, the connecting portion 111 can provide a greater elastic supporting force for the sealing portion 110, and meanwhile, by increasing the number of connecting portions 111, the force application points of the elastic supporting force to the sealing portion 110 by the connecting portion 111 can be increased, so that the balance of the supporting effect of the connecting portion 111 on the sealing portion 110 is improved, and the consistency of the abutting tightness between the sealing surface 110a and the cover plate main body 20 is improved.

Preferably, the plurality of connection parts 111 may be disposed equidistantly around the sealing part 110, so that the balance of the supporting effect of the connection parts 111 on the sealing part 110 is optimal, and the consistency of the abutment tightness of the sealing surface 110a with the cap plate body 20 is also optimal.

Alternatively, the connection portion 111 may be formed in a strip-shaped structure that is curved and protruded away from the body plate structure 10, so that the connection portion 111 can provide a greater elastic supporting force to the sealing portion 110 while making the structure of the connection portion 111 simpler.

The inventors have further studied that the connecting portion 111 has a height H in a direction perpendicular to the sealing surface 110a and a length L in a direction parallel to the sealing surface 110a, and found that the smaller the ratio H/L of the height H to the length L of the connecting portion 111, the smaller the elastic supporting force that the connecting portion 111 can provide for the sealing portion 110, and the larger the H/L, the more stress that the structure of the connecting portion 111 generates upon elastic deformation, the more easily the connecting portion 111 breaks, and therefore, the ratio H/L of the height H to the length L of the connecting portion 111 cannot be excessively large or small. Based on this, preferably, the ratio H/L of the height H to the length L of the connection portion 111 may satisfy: 0.2.ltoreq.H/L.ltoreq.1.5, for example, H/L may be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4 or 1.5, etc., where the units of height H and length L are each mm.

In the direction perpendicular to the sealing surface 110a, the connecting portion 111 has a thickness, in some alternative examples, the connecting portion 111 may have a structure with different thicknesses, in other words, the connecting portion 111 may have at least one reduced thickness portion 111a, so that when the connecting portion 111 is elastically deformed, the elastic deformation mainly occurs in the reduced thickness portion 111a in a concentrated manner, so that the controllability of the elastic deformation of the connecting portion 111 is higher, and the simulation calculation of the stress and the structural deformation of the connecting portion 111 is more convenient.

The minimum thickness of the connection portion 111 may be t1, that is, the minimum thickness of the reduced thickness portion 111a of the connection portion 111 may be t1, the smaller the thickness t1, the larger the elastic deformation that can be generated by the reduced thickness portion 111a, but the smaller the structural strength of the reduced thickness portion 111a, the smaller the elastic supporting force that can be provided by the connection portion 111 to the sealing portion 110, the larger the thickness t1, the smaller the elastic deformation that can be generated by the reduced thickness portion 111a, the smaller the function of the reduced thickness portion 111a that concentrates the elastic deformation of the connection portion 111, the lower the controllability of the elastic deformation of the connection portion 111, but the larger the elastic supporting force that can be provided by the connection portion 111 to the sealing portion 110, and therefore, the thickness t1 may not be excessively small or excessively large, based on which, alternatively, the thickness t1 may satisfy: 0.2 mm.ltoreq.t1.ltoreq.1 mm, for example, the thickness t1 may be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, etc.

In the direction parallel to the sealing surface 110a, the connecting portion 111 may have a width, in other alternative examples, the connecting portion 111 may have a structure with unequal widths, in other words, the connecting portion 111 may have at least one widened portion 111b, so that the connecting portion 111 is easy to elastically bend in the width direction at the widened portion 111b, so that the sealing portion 110 supported by the connecting portion 111 can twist by a small margin in the circumferential direction, and thus, in the case that the sealing portion 110 needs to twist by a small margin due to a manufacturing error to tightly abut the sealing surface 110a against the cover plate main body 20, the connecting portion 111 can bend in the width direction at the widened portion 111b, so that the sealing portion 110 can twist by a small margin to automatically tightly abut the sealing surface 110a against the cover plate main body 20, and the sealing effect of the sealing surface 110a against the liquid injection hole 200 is better.

The minimum width of the connection portion 111 may be t2, that is, the minimum width of the widened portion 111b of the connection portion 111 may be t2, the smaller the width t2, the larger the elastic bending that can occur at the widened portion 111b, but the smaller the structural strength of the widened portion 111b, the smaller the elastic supporting force that can be provided by the connection portion 111 to the sealing portion 110, the larger the width t2, the smaller the elastic bending that can occur at the widened portion 111b, the smaller the twisting amplitude that can occur at the sealing portion 110, the more limited the function of the sealing portion 110 to automatically adjust the posture so that the sealing surface 110a closely contacts the cover plate main body 20, but the larger the elastic supporting force that can be provided by the connection portion 111 to the sealing portion 110, and therefore, the width t2 may not be excessively small or large, based on this, alternatively, the width t2 may satisfy: 0.2 mm.ltoreq.t2.ltoreq.1 mm, for example, the width t2 may be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, etc.

In still other alternative examples, the connecting portion 111 may have a structure with different thickness and different width, in other words, the connecting portion 111 may have at least one reduced thickness portion 111a and at least one reduced width portion 111b, so that the controllability of elastic deformation of the connecting portion 111 is higher, and at the same time, the connecting portion 111 is easy to elastically bend in the width direction at the reduced width portion 111b, so that the sealing surface 110a is easier to automatically and tightly abut against the cover plate main body 20, and the sealing effect of the sealing surface 110a on the liquid injection hole 200 is better.

Alternatively, the minimum thickness of the connection portion 111 may be t1, that is, the minimum thickness of the reduced thickness portion 111a of the connection portion 111 may be t1, and the thickness t1 may satisfy: 0.2 mm.ltoreq.t1.ltoreq.1 mm, and the width of the connecting portion 111 may be at least t2, that is, the minimum width of the widened portion 111b of the connecting portion 111 may be at least t2, and the width t2 may satisfy: the effect obtained by the values of the thickness t1 and the thickness t2 is 0.2mm or less and t 2mm or less, which can be seen from the above technical proposal, and is not described here again.

Alternatively, the sealing structure 11 may be integrally formed with the body plate structure 10, for example, the sealing structure 11 and the body plate structure 10 may be integrally formed, or the sealing structure 11 and the body plate structure 10 may be fixedly connected by adhesive connection, welding or other fixing connection manner so as to be integrally formed, so that the overall structure of the insulating plate 1 is more stable.

Since the body plate structure 10 needs to have insulation, the body plate structure 10 is usually plastic with good insulation, and since plastic usually has certain elasticity, based on this, preferably, the sealing structure 11 and the body plate structure 10 can be made of the same plastic material, and the whole insulating plate 1 can be integrally formed by injection molding, in other words, the whole sealing structure 11 and the body plate structure 10 can be integrally formed by injection molding, so that the manufacturing process of the insulating plate 1 is simple, and the connection stability of the sealing structure 11 and the body plate structure 10 is good.

Referring to fig. 1, 2 and 3 again, optionally, the surface of the body plate structure 10 may be provided with ribs 100 to strengthen the structural strength of the body plate structure 10.

It can be appreciated that the portion of the body plate structure 10 protruding with the reinforcing ribs 100 has a greater thickness than the portion not protruding with the reinforcing ribs 100, and therefore, in the injection molding process, the cooling of the injection molding material at the portion of the body plate structure 10 protruding with the reinforcing ribs 100 is slower and the cooling and solidification are more time-consuming. Based on this, preferably, the connecting portion 111 may be connected between the sealing portion 110 and the reinforcing rib 100, so that in the injection molding process, the injection molding material can enter the connecting portion 111 from the reinforcing rib 100 to form the structure of the connecting portion 111 and the sealing portion 110, the temperature of the injection molding material when entering the connecting portion 111 is higher, the defect that the sealing structure 11 is lack of material due to insufficient glue running caused by cooling and solidifying the injection molding material in advance can be reduced, and the yield of injection molding of the sealing structure 11 is improved.

Optionally, the body plate structure 10 may be provided with a first through hole 101, where the first through hole 101 is used for corresponding to the liquid injection hole 200, and the sealing structure 11 may be erected on the first through hole 101, so that when the liquid injection head injects liquid from the liquid injection hole 200 into the battery (i.e., the side of the body plate structure 10 facing away from the cover plate main body 20), the electrolyte quickly enters the battery through the first through hole 101.

Alternatively, the body plate structure 10 may be provided with a plurality of second through holes 102 in an array, so that when the liquid filling head fills liquid from the liquid filling hole 200 into the battery (i.e., the side of the body plate structure 10 facing away from the cover plate main body 20), the electrolyte permeates into the battery through the second through holes 102.

Preferably, the body plate structure 10 may be provided with the first through hole 101 and the second through hole 102 at the same time, so that the electrolyte can quickly enter the battery through the first through hole 101, and the electrolyte which does not fall into the first through hole 101 can be permeated into the battery through the second through hole 102, so that the electrolyte injection efficiency is higher.

As shown in fig. 3, 5 and 6, the present utility model provides a cover assembly 2 for a battery, where the cover assembly 2 includes a cover main body 20 and an insulating plate 1 provided by the foregoing technical solution. The liquid filling hole 200 has been seted up to apron main part 20, one side of apron main part 20 is located to body plate structure 10, one side that is close to apron main part 20 of body plate structure 10 is located to sealing portion 110, and sealing portion 110 can seal liquid filling hole 200, because sealing portion 110 is located between body plate structure 10 and the apron main part 20, sealing structure 11 whole is little to the occupation of the space (i.e. the inner space of battery) of keeping away from apron main part 20 side of body plate structure 10, consequently can promote electric core energy density and the security of the battery including this apron subassembly 2.

Optionally, the gap between the cover plate main body 20 and the body plate structure 10 is smaller than the protruding height of the sealing surface 110a protruding from the body plate structure 10, so that when the body plate structure 10 is disposed on one side of the cover plate main body 20, the whole sealing structure 11 can be pressed between the body plate structure 10 and the cover plate main body 20, that is, the sealing surface 110a can be tightly abutted against the surface of the cover plate main body 20, and meanwhile, the connecting portion 111 is pressed to generate a certain elastic deformation, so that an elastic force is continuously applied to the sealing portion 110, so that the sealing surface 110a is pressed on the surface of the cover plate main body 20 more stably, and the sealing effect of the sealing surface 110a on the liquid injection hole 200 is more stable.

It will be appreciated that the smaller the distance between the cover plate main body 20 and the body plate structure 10, the larger the pressing force of the sealing surface 110a abutting against and pressing against the surface of the cover plate main body 20, the more stable the sealing effect on the liquid injection hole 200, but the smaller the operation space between the cover plate main body 20 and the body plate structure 10 for the liquid injection head to enter for liquid injection and air extraction, the larger the distance between the cover plate main body 20 and the body plate structure 10, the smaller the pressing force of the sealing surface 110a abutting against the surface of the cover plate main body 20, the more difficult the sealing effect on the liquid injection hole 200 is to be kept stable, but the larger the operation space between the cover plate main body 20 and the body plate structure 10 for the liquid injection head to enter for liquid injection and air extraction, the specific distance between the cover plate main body 20 and the body plate structure 10 can be selected according to the use requirement, and the embodiment is not particularly limited.

As shown in fig. 7 and 8, the battery 3 includes a housing 30, a battery cell 31, and a cover assembly 2 provided by the foregoing technical solution, wherein one side of the housing 30 has an opening 300, the battery cell 31 is disposed in the housing 30, the cover assembly 2 covers the opening 300, and the cover main body 20 is located on one side of the insulating plate 1 away from the battery cell 31, and the sealing portion 110 (see fig. 3) occupies a small space inside the battery 3, so that the energy density of the battery cell 31 of the battery 3 is higher, and the use safety of the battery 3 is higher.

As shown in fig. 9, 10, 11 and 12, the present utility model provides a liquid injection head 4, wherein the liquid injection head 4 is used for injecting liquid into the battery 3 provided by the above-mentioned technical scheme, and the liquid injection head 4 comprises a main body portion 40 and an extension portion 41. The main body 40 is provided with a first channel 400, the main body 40 is used for being connected with the cover plate main body 20 in a sealing way so as to seal the liquid injection hole 200, the extension part 41 is convexly arranged on the main body 40, the extension part 41 is used for penetrating through the liquid injection hole 200, the top end 410 of the extension part 41 is used for propping against the sealing part 110 and entering the inside of the shell 30, the periphery of the top end 410 is provided with a channel opening 411, and the channel opening 411 is communicated with the first channel 400.

By providing the extension portion 41 capable of penetrating through the liquid injection hole 200, the sealing portion 110 can be abutted against the top end 410 of the extension portion 41 to release the sealing of the liquid injection hole 200, and the top end 410 is enabled to enter the position between the cover plate main body 20 and the body plate structure 10, so that the channel opening 411 on the periphery of the top end 410 is communicated with the gap between the cover plate main body 20 and the body plate structure 10, and the interior of the battery 3 is pumped and injected through the channel opening 411, and in the process, the sealing portion 110 can not block the channel opening 411 to block the pumping and the liquid injection of the liquid injection head 4.

As mentioned above, when the sealing portion 110 is provided with the alignment portion 112, the extension portion 41 can also abut against the alignment portion 112, so that the alignment portion 112 drives the sealing portion 110 to move to release the sealing of the injection hole 200.

The protrusion height c of the extension portion 41 protruding from the main body portion 40 is c, so that, in order to make the channel opening 411 provided at the periphery of the top end 410 enter the position between the cover plate main body 20 and the body plate structure 10 to communicate with the gap between the cover plate main body 20 and the body plate structure 10, the protrusion height c needs to be larger, but when the protrusion height c is too large, it is easy to cause that the top end 410 of the extension portion 41 abuts the sealing portion 110 against the battery cell 31 in the injection process, resulting in the situation that the battery cell 31 is damaged, based on this, alternatively, the height c may satisfy: 0.5 mm.ltoreq.c.ltoreq.1 mm, for example, the height c may be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, etc.

Alternatively, the top end 410 may have a top surface 410a far away from the main body 40, the top surface 410a is used to abut against the sealing portion 110 and enter the interior of the battery 3, the top surface 410a may be provided with a second channel 412, the second channel 412 is communicated with the first channel 400, the channel opening 411 is provided on the periphery of the top end 410 and the top surface 410a, and the channel opening 411 is communicated with the second channel 412, so that during the manufacturing process of the liquid injection head 4, the extending portion 41 may be processed on one side of the top surface 410a to form the channel opening 411 communicated with the second channel 412, and especially when the channel opening 411 is multiple, the channel opening 411 with multiple opening directions can be manufactured without changing the processing direction, so that the processing steps can be simplified.

In addition, by opening the passage opening 411 to the outer periphery of the tip 410 and the top surface 410a, when the top surface 410a is abutted against the sealing portion 110, there is no space between the passage opening 411 and the sealing portion 110, and thus bubbles are not likely to be generated between the passage opening 411 and the sealing portion 110 during the injection process.

Alternatively, the outer periphery of the top end 410 may have an outer peripheral surface 410b connected to the top surface 410a, and the channel opening 411 is formed on the outer peripheral surface 410b, where the outer peripheral surface 410b may be perpendicular to or inclined with respect to the top surface 410a, or the outer peripheral surface 410b may be a cambered surface or other shaped surface.

In the related art, two types of liquid injection heads 4 are generally classified according to the operation mode of the liquid injection head 4, one type is the liquid injection head 4 for realizing respiratory liquid injection by alternately pumping and injecting liquid into the battery 3, and the other type is the liquid injection head 4 for realizing liquid injection by simultaneously pumping and injecting liquid into the battery 3. Next, the specific structure of the liquid injection head 4 provided in this embodiment will be described by way of example with reference to the accompanying drawings when the liquid injection heads 4 provided in this embodiment are respectively the two types of liquid injection heads 4.

As shown in fig. 10, 11 and 12, in an alternative example, the liquid injection head 4 is used for respiratory liquid injection into the battery 3, the channel opening 411 of the liquid injection head 4 is used as an air extraction opening during air extraction of the liquid injection head 4, the first channel 400 is used as an air extraction channel, and the channel opening 411 of the liquid injection head 4 is used as a liquid injection opening during liquid injection of the liquid injection head 4, and the first channel 400 is used as a liquid injection channel.

Optionally, the number of the channel openings 411 may be plural, and the plurality of channel openings 411 are disposed at intervals along the circumference of the top end 410, and the plurality of channel openings 411 are all communicated with the first channel 400, so that by increasing the number of the channel openings 411, the total opening area of the channel openings 411 can be increased, thereby reducing the flow velocity of the fluid at the channel openings 411 in the process of air extraction and liquid injection, and reducing the influence of air flow and electrolyte injection on the inside of the battery 3 in the process of air extraction and liquid injection.

As shown in fig. 13, in another alternative example, the liquid injection head 4 performs liquid injection by simultaneously performing air extraction and liquid injection on the interior of the battery 3, where the first channels 400 may be multiple, the first channels 400 are arranged at intervals, at least one first channel 400 is a liquid injection channel 400a, and the remaining at least one first channel 400 is an air extraction channel 400b, the channel openings 411 may be multiple, the channel openings 411 are arranged at intervals, at least one channel opening 411 is an liquid injection opening 411a, and the remaining at least one channel opening 411 is an air extraction opening 411b, the liquid injection opening 411a is communicated with the liquid injection channel 400a, and the air extraction opening 411b is communicated with the air extraction channel 400b, so that the liquid injection head 4 can perform liquid injection on the interior of the battery 3 through the air extraction channel 400b and the air extraction opening 411b, and can also perform liquid injection on the interior of the battery 3 through the liquid injection channel 400a and the liquid injection opening 411a, so as to maintain the air pressure inside the battery 3 within a relatively stable range during the liquid injection process.

Alternatively, the plurality of injection openings 411a may be communicated with the same injection channel 400a to reduce the flow rate of the electrolyte injected from the plurality of injection openings 411a during the injection process, thereby reducing the influence of the electrolyte on the inside of the battery 3 caused by the impact on the inside of the battery 3.

Alternatively, the plurality of air extraction openings 411b may be communicated with the same air extraction channel 400b to reduce the flow rate of air at the plurality of air extraction openings 411b during the air extraction process, thereby reducing the influence of the air flow on the inside of the battery 3.

Optionally, the main body portion 40 may further be provided with a sealing ring 401, where the sealing ring 401 is located on one side of the main body portion 40, where the extending portion 41 is protruding, and surrounds the outer periphery of the extending portion 41, and the main body portion 40 is abutted to the cover plate main body 20 through sealing of the sealing ring 401, so that the sealing effect on the liquid injection hole 200 is better, and leakage between the main body portion 40 and the cover plate main body 20 in the air extraction process can be avoided, and leakage between the main body portion 40 and the cover plate main body 20 in the liquid injection process can be avoided.

Preferably, the surface of the main body portion 40 may further be provided with a setting groove 402 around the extension portion 41, and the sealing ring 401 is partially located in the setting groove 402 and connected to a groove wall of the setting groove 402, so that an effective connection area between the sealing ring 401 and the main body portion 40 is larger, and connection stability between the sealing ring 401 and the main body portion 40 is better.

As shown in fig. 14, the present utility model provides a liquid injection apparatus 5, where the liquid injection apparatus 5 includes an air extracting device 50, a liquid injecting device 51, and a liquid injection head 4 provided by the foregoing technical solution, the air extracting device 50 and the liquid injecting device 51 are respectively connected to the liquid injection head 4 and respectively connected to a first channel 400 (see fig. 11), and by providing the foregoing liquid injection head 4, liquid injection can be performed inside a battery 3 provided by the foregoing technical solution, and the liquid injection process is less hindered by a sealing structure 11 (see fig. 12).

In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and the like are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify the operation, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

In the description herein, reference to the term "one embodiment," "an example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in the foregoing embodiments, and that the embodiments described in the foregoing embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

The technical principle of the present utility model is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the utility model and should not be taken in any way as limiting the scope of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from consideration of this specification without undue burden.

Claims

1. An insulation board for the apron subassembly of battery, the apron subassembly include the apron main part with the insulation board, annotate the liquid hole has been seted up to the apron main part, its characterized in that, the insulation board includes:

2. An insulating plate as claimed in claim 1, in which the side of the sealing portion remote from the body plate structure has a sealing face for abutment against the cover plate body to seal the liquid injection hole;

3. An insulating plate according to claim 2, wherein the sealing surface has an envelope circle diameter R,4mm r.ltoreq.8mm, and/or the sealing surface has an area S1, the radius of the liquid injection hole is a, 2.ltoreq.s1/(pi a) ² ) Less than or equal to 5, wherein the unit of the area S1 is mm ² Radius a is in mm.

4. The insulating plate of claim 2, wherein the sealing surface has a first central axis, the sealing structure further comprises an alignment portion protruding from the sealing surface, and the alignment portion is configured to extend into the liquid injection hole, so that the first central axis of the sealing surface coincides with the second central axis of the liquid injection hole.

5. An insulating plate as claimed in claim 4, in which the outer periphery of the alignment portion has a guide surface for guiding the alignment portion into the liquid injection hole.

6. An insulating plate as claimed in claim 2, wherein the connecting portion is of at least partially curved strip-like configuration, opposite ends of the connecting portion are respectively connected to the sealing portion and the body plate structure, and the connecting portion is plural and is disposed at intervals around the sealing portion.

7. An insulating plate as claimed in claim 6, in which the connecting portion is formed in a strip-like configuration which is curved and convex away from the body panel structure, the connecting portion having a height H in a direction perpendicular to the sealing face and a length L in a direction parallel to the sealing face, 0.2 +.h/L +.1.5.

8. An insulating plate as claimed in claim 6, in which the connecting portion has a thickness in a direction perpendicular to the sealing face, the connecting portion being of unequal thickness; and/or the number of the groups of groups,

9. An insulating plate according to claim 8, wherein when the connecting portions are of unequal thickness, the thickness is at least t1,0.2mm ∈t1 ∈1mm; and/or the number of the groups of groups,

10. An insulating panel as claimed in any one of claims 1 to 9, in which the surface of the body panel structure is provided with reinforcing ribs and the connection portion is connected between the sealing portion and the reinforcing ribs.

11. An insulating plate as claimed in any one of claims 1 to 9, in which the body panel structure is provided with a first through hole for corresponding to the liquid injection hole, the sealing structure being provided in the first through hole.

12. A cover assembly for a battery, the cover assembly comprising:

an insulating plate as claimed in any one of claims 1 to 11, said body panel structure being provided on one side of said cover plate body, said sealing portion being provided on one side of said body panel structure adjacent said cover plate body, and said sealing portion being capable of sealing said liquid injection hole.

13. A battery, wherein the battery comprises a housing, a battery cell and the cover plate assembly of claim 12, wherein one side of the housing has an opening, the battery cell is disposed inside the housing, the cover plate assembly covers the opening, and the cover plate main body is located on one side of the insulating plate away from the battery cell.

14. A liquid filling head for filling liquid into the battery according to claim 13, the liquid filling head comprising:

15. The filling head according to claim 14, wherein the protrusion height of the extension portion protruding from the main body portion is c, and c is 0.5 mm.ltoreq.c.ltoreq.1 mm.

16. The fill head of claim 14, wherein the top end has a top surface remote from the body portion for abutting against the seal and into the interior of the battery;

17. The fill head of any one of claims 14-16, wherein the plurality of channel openings are circumferentially spaced along the tip, the plurality of channel openings each communicating with the first channel.

18. The head of any one of claims 14-16, wherein the first channels are a plurality of the first channels are spaced apart, at least one of the first channels is a liquid injection channel, and the remaining at least one of the first channels is a suction channel;

19. A liquid injection device, characterized in that the liquid injection device comprises an air extracting device, a liquid injection device and a liquid injection head according to any one of claims 14-18, wherein the air extracting device and the liquid injection device are respectively connected to the liquid injection head and respectively communicated with the first channel.