CN215816316U - Top cap liquid injection structure of battery cell and battery cell - Google Patents
Top cap liquid injection structure of battery cell and battery cell Download PDFInfo
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- CN215816316U CN215816316U CN202121481746.0U CN202121481746U CN215816316U CN 215816316 U CN215816316 U CN 215816316U CN 202121481746 U CN202121481746 U CN 202121481746U CN 215816316 U CN215816316 U CN 215816316U
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- liquid injection
- cover plate
- injection hole
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses a top cover liquid injection structure of a battery cell and the battery cell, wherein the top cover liquid injection structure comprises: the shell, compound apron, utmost point post are equipped with the accommodation space that is used for holding roll core and electrolyte in the shell, and compound apron includes insulating apron and metal framework, and compound apron is connected on the shell top, and utmost point post passes insulating apron and stretches into in the accommodation space to be connected with roll core electricity. The composite cover plate is provided with a liquid injection hole communicated with the containing space, the liquid injection hole is positioned on the outer side of the pole, a sealing piece is inserted into the liquid injection hole, and the sealing piece is tightly matched with the inner wall of the liquid injection hole. Therefore, the metal framework can play a role in balancing the insulating cover plate, so that the force applied by the shell to resist the insulating cover plate and used for enabling the insulating cover plate to be separated is facilitated, and the sealing property and the tightness of the composite cover plate at the assembling port of the shell are improved. Annotate the liquid hole and realize the sealed of annotating the liquid hole with the sealing member cooperation, avoid the loss of electrolyte and be convenient for add electrolyte to make electric core can normal use.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a top cover liquid injection structure of a battery core and the battery core.
Background
In the related art, the liquid injection hole of the battery cell is formed in the insulating cover plate or the metal cover plate, and can be directly formed by integral molding with the insulating cover plate or the metal cover plate, and the formed liquid injection hole is generally cylindrical, so that when the liquid injection hole is matched with the sealing element, the normal use of the battery cell is affected due to the leakage of electrolyte caused by insufficient tightness of matching. In order to avoid the too big reduction of the inside pressure of electric core to use the security of electric core, can set up explosion-proof valve on the top of electric core, be used for the pressure release to increase the security that electric core used, explosion-proof valve designs respectively with annotating the liquid hole, increases processing technology's the degree of difficulty and the manufacturing cost of enterprise.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. To this end, an object of the present invention is to provide a top cap liquid injection structure of a battery cell and the battery cell.
The cap liquid injection structure of the battery cell according to the embodiment of the first aspect of the utility model comprises: shell, compound apron, utmost point post, be equipped with the accommodation space who is used for holding book core and electrolyte in the shell, the top of shell is opened and is formed the assembly opening, compound apron is including the insulating apron and the metal framework who connect each other, compound apron is in assembly opening department with the shell is connected, and seals accommodation space, insulating apron is the elastic component, insulating apron's lateral wall with the inner wall extrusion fit of shell, utmost point post passes insulating apron and stretch into in the accommodation space, and with roll up the core electricity and connect.
The composite cover plate is provided with a liquid injection hole communicated with the containing space, the liquid injection hole is positioned on the outer side of the pole, a sealing element is inserted into the liquid injection hole, and the sealing element is tightly matched with the inner wall of the liquid injection hole.
From this, connect insulating cover plate and metal framework each other and form compound apron to increase compound apron's structural strength, when insulating cover plate received extrusion seal, metal framework can play the counter weight effect to insulating cover plate, is favorable to resisting the power that makes insulating cover plate deviate from that the shell that insulating cover plate received was applyed, has improved the leakproofness and the connection compactness of whole compound apron in shell assembly opening department. Annotate the liquid hole and realize the sealed of annotating the liquid hole with the sealing member cooperation, avoid the loss of electrolyte and be convenient for add electrolyte to make electric core can normal use.
In some embodiments, the pour hole is reverse tapered.
In some embodiments, the seal is a seal spike, the seal spike comprising: the nail body is cylindrical and is used for being inserted into the liquid injection hole, and the nail head is inverted-cone-shaped and is used for being abutted against the end face of the insulating cover plate.
In some embodiments, the one end of rolling up the core is anodal ear, and the other end is the negative pole ear, the negative pole ear of rolling up the core with the utmost point post passes through the negative pole keysets and is connected, the anodal ear of rolling up the core with the bottom of shell is connected, the negative pole keysets includes: the cylinder manifold comprises a cylinder manifold plate and a connecting plate, wherein the connecting plate is provided with at least one bent part. The liquid injection hole is positioned on the end face of the winding core, and the projection of the liquid injection hole on the end face of the winding core is staggered with the projection of the connecting piece on the end face of the winding core.
In some embodiments, the distance between the liquid injection hole and the pole is greater than 3 mm.
In some embodiments, the diameter of the liquid injection hole is 2mm to 20 mm.
In some embodiments, the diameter of the liquid injection hole is 0.1mm-2mm smaller than that of the sealing nail.
In some embodiments, the sealing member is configured to be forced to be disengaged from the liquid injection hole by the air pressure when the air pressure in the accommodating space is greater than a preset pressure.
In some embodiments, the housing further has a protrusion portion on the side wall and a bent portion on the top, the protrusion portion is adapted to press the side wall of the insulating cover plate or press the bottom wall of the insulating cover plate, and the bent portion presses the insulating cover plate at the top end of the insulating cover plate; metal framework is cyclic annular metal sheet, the top of insulating apron has annular holding tank and locates boss in the holding tank, annotate the liquid hole and run through the boss, metal framework is located in the holding tank, metal framework has the confession the hole of dodging that the boss passed.
The battery cell according to an embodiment of the second aspect of the present invention includes the cap liquid injection structure described in any of the above embodiments.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of cells arranged into a battery according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a cell according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a three-dimensional split of a battery cell according to an embodiment of the present invention.
Fig. 4 is a schematic cross-sectional view of a cell according to an embodiment of the utility model.
FIG. 5 is a schematic view of a composite cover sheet according to an embodiment of the utility model.
Fig. 6 is a schematic assembly diagram of a composite cover plate and a pole according to an embodiment of the utility model.
Fig. 7 is an assembly schematic diagram of an insulating cover plate and a pole according to an embodiment of the utility model.
FIG. 8 is a schematic view of a seal according to an embodiment of the present invention.
Fig. 9 is a schematic top view of a metal skeleton according to an embodiment of the utility model.
Reference numerals:
an electric core 100;
a top cover liquid injection structure 10; a housing 11; the accommodating space 111; a fitting opening 112; a protrusion 113; a bent portion 114; a composite cover plate 12; an insulating cover plate 121; accommodating grooves b; a boss c; a liquid injection hole d; a metal skeleton 122; avoiding holes a; a pole 13;
a positive electrode interposer 20;
a negative electrode interposer 30; a confluence plate 31; a connecting piece 32;
a seal member 40; a nail body 41; a nail head 42;
a core 50.
Detailed Description
Embodiments of the present invention are described in detail below, the embodiments described with reference to the drawings are exemplary, and the cap injection structure 10 of the battery cell 100 and the battery cell 100 according to the embodiments of the present invention are described below with reference to fig. 1 to 9.
In order to meet different power requirements, the battery may include a plurality of battery cells, which may also be referred to as battery cells 100, where the plurality of battery cells 100 may be connected in series, in parallel, or in a series-parallel manner, and the series-parallel manner refers to a mixture of series connection and parallel connection. That is, a plurality of battery cells 100 may be directly disposed in a battery box to constitute a battery, as shown in fig. 1. Of course, the battery cell 100 is not limited to be assembled into a battery, and may be used as an independent charging/discharging element.
The battery cell 100 includes a casing 11 and a cell main body (e.g., a winding core 50 or a laminated structure formed by stacking positive and negative electrode sheets) disposed in the casing 11. For a square battery cell 100, the casing 11 has a rectangular parallelepiped shape, and for a cylindrical battery cell 100, the casing 11 of the battery cell 100 may have a cylindrical shape. The case 11 has an internal space that accommodates the cell main body and the electrolyte, and a fitting port 112 that communicates with the internal space. The core 50 can be inserted into the housing 11 from the fitting opening 112. The housing 11 may be made of a material such as aluminum, aluminum alloy, or plastic.
The cover assembly, which may also be referred to as an end cap assembly, seals the mounting opening 112 of the housing 11. For the cell 100 shown in fig. 1 as a cylindrical cell 100, the cap assembly is disc-shaped, and for a square cell 100, the cap assembly is correspondingly substantially square-shaped.
The cap injection structure 10 of the battery cell 100 according to the embodiment of the first aspect of the present invention includes: shell 11, compound apron 12, utmost point post 13, be equipped with the accommodation space 111 that is used for holding core 50 and electrolyte in the shell 11, the top of shell 11 is opened and is formed assembly opening 112, compound apron 12 is including insulating apron 121 and the metal framework 122 that connects each other, compound apron 12 is connected with shell 11 in assembly opening 112 department, and seal accommodation space 111, insulating apron 121 is the elastic component, the lateral wall of insulating apron 121 and the inner wall extrusion fit of shell 11, utmost point post 13 passes insulating apron 121 and stretches into in accommodation space 111, and be connected with core 50 electricity.
As shown in fig. 2 to 5, a metal skeleton 122 is disposed on a surface of a side of the insulating cover plate 121 facing away from the winding core 50, or the metal skeleton 122 is embedded inside the insulating cover plate 121, the insulating cover plate 121 and the metal skeleton 122 are mounted to form a composite cover plate 12, the composite cover plate 12 can be mounted and matched with the mounting opening 112 of the housing 11, and the winding core 50 is located inside the housing 11 and mounted in the receiving space 111 defined by the housing 11 and the composite cover plate 12. The insulating cover plate 121 has elasticity, and when the composite cover plate 12 is mounted with the housing 11, the side wall of the composite cover plate 12 can be pressed by the mounting opening 112 of the housing 11, and has a certain deformation capability. A mounting hole (not shown in the figure) is further formed in the middle of the composite cover plate 12, the pole 13 can penetrate through the mounting hole to be matched with the composite cover plate 12, one end of the pole 13 is fixed to the composite cover plate 12, and the other end of the pole is fixedly connected to the top end of the winding core 50.
The composite cover plate 12 has a liquid injection hole d communicated with the accommodating space 111, the liquid injection hole d is located on the outer side of the pole 13, a sealing member 40 is inserted into the liquid injection hole d, and the sealing member 40 is tightly fitted with the inner wall of the liquid injection hole d.
That is, as shown in fig. 4, a liquid injection hole d is formed in the composite cover plate 12, the liquid injection hole d passes through the composite cover plate 12 and communicates with the accommodating space 111, the liquid injection holes d are distributed in the circumferential direction of the pole post 13, a detachable sealing member 40 is further mounted inside the liquid injection hole d, and the sealing member 40 is tightly fitted with the liquid injection hole d.
Therefore, the insulating cover plate 121 and the metal framework 122 are connected with each other to form the composite cover plate 12, so that the structural strength of the composite cover plate 12 is increased, when the insulating cover plate 121 is pressed and sealed, the metal framework 122 can play a role of counterweight on the insulating cover plate 121, the insulating cover plate 121 can be favorably resisted by the force applied by the shell 11 to enable the insulating cover plate 121 to be separated, and the sealing performance and the connection tightness of the whole composite cover plate 12 at the assembling port 112 of the shell 11 are improved. Annotate liquid hole d and the sealed of annotating liquid hole d of the realization of sealing member 40 cooperation, avoid the loss of electrolyte and be convenient for add electrolyte to make electric core 100 can normal use.
Specifically, as shown in fig. 6 and 7, the pour hole d is reverse tapered. Therefore, the liquid injection hole d is set to be in an inverted cone shape, namely the sectional area of one end, close to the winding core 50, of the liquid injection hole d is smaller than the sectional area of one end, far away from the winding core 50, of the liquid injection hole d, so that the sealing performance of the liquid injection hole d is improved and the sealing element 40 is tightly installed due to the fact that the sealing element 40 is more closely matched with the liquid injection hole d when being assembled with the liquid injection hole d due to the fact that the external force is larger.
Further, the seal 40 is a sealing spike comprising: the nail body 41 is cylindrical and is used for being inserted into the liquid injection hole d, and the nail head 42 is inverted conical and is used for being abutted against the end face of the insulating cover plate 121.
As shown in fig. 8, the nail body 41 of the seal nail may be cylindrical, or a chamfer may be provided at one end of the cylindrical nail body 41 away from the nail head 42, the other end of the nail body 41 is connected with the nail head 42, the nail head 42 mainly presents a frustum cone (circular truncated cone) shape, and the nail head 42 is connected and fixed with one end of the frustum cone with a smaller cross-sectional area.
From this, the nail body 41 of sealed nail can form the cooperation with annotating liquid hole d, be convenient for insert sealed nail and annotate liquid hole d, realize the sealed of annotating liquid hole d, the pin fin 42 is the back taper and is convenient for tip and the insulating cover plate 121 contact of pin fin 42 and the contact of nail body 41, end to on insulating cover plate 121, in order to avoid the whole compound apron 12 of entering of sealing member 40, be not convenient for the maintenance and the dismantlement in later stage, also can effectively prevent the condition of weeping simultaneously and take place.
In some embodiments, one end of the winding core 50 is a positive tab, the other end is a negative tab (both shown in the figure), the negative tab of the winding core 50 is connected to the terminal 13 through the negative adapter sheet 30, the positive tab of the winding core 50 is connected to the bottom end of the housing 11, and the negative adapter sheet 30 includes: the bus bar 31 and the connecting piece 32, the connecting piece 32 has at least one bend. The projection of the liquid injection hole d on the end face of the winding core 50 is offset from the projection of the connecting piece 32 on the end face of the winding core 50.
As shown in fig. 4, the two ends of the winding core 50 are respectively provided with a positive electrode tab and a negative electrode tab, one end of the winding core 50 close to the composite cover plate 12 can be connected with the negative electrode tab, one end of the winding core 50 departing from the composite cover plate 12 is connected with the positive electrode tab, the negative electrode tab is electrically connected with one side of the bus disc 31, the other side of the bus disc 31 is electrically connected with one end of the connecting sheet 32, the other end of the connecting sheet 32 is electrically connected with the pole 13, the pole 13 is the negative pole column 13, and the positive electrode tab is directly connected with the bottom of the shell 11 through the positive adapter sheet 20. The connecting sheet 32 is provided with a bend, and yellow glue can be coated on the surface of the bent part, so that the strength of the connecting sheet 32 is improved, and the possibility of fatigue fracture of the connecting sheet 32 is reduced.
Therefore, at least one bending part is arranged on the connecting sheet 32, so that the attaching degree of the connecting sheet 32 and the surface of the convergence plate 31 can be increased, the structural strength of the negative electrode adapter sheet 30 is higher, the switching effect is better, and the charging and discharging of the battery cell 100 are facilitated; the position that annotate liquid hole d and seted up staggers with the position that connection piece 32 and utmost point post 13 are connected, annotates liquid hole d promptly and does not contact with connection piece 32 in the axial, can directly pour into accommodation space 111 into when being convenient for annotate liquid hole d and annotate liquid in, avoid the interference of connection piece 32 and the efficiency of annotating liquid is improved.
Optionally, the distance between the liquid injection hole d and the pole 13 is greater than 3 mm. From this, control is annotated the interval between liquid hole d and the utmost point post 13 to avoid annotating the in-process of liquid, electrolyte causes the pollution to utmost point post 13, influences utmost point post 13's chemistry and physical properties, damages or reduces utmost point post 13's conductivity.
Optionally, the diameter of the liquid injection hole d is 2mm-20 mm. Therefore, the aperture of the liquid injection hole d is controlled within the range of 2mm-20mm, the opening size of the liquid injection hole d is ensured, and the liquid injection efficiency can be improved when liquid injection is needed.
Optionally, the diameter of the liquid injection hole d is 0.1mm-2mm smaller than that of the sealing nail, that is, the diameter of the nail body 41 of the sealing nail is slightly larger than the aperture of the liquid injection hole d. From this, annotate the installation of liquid hole d and sealed nail and can adopt transition fit, be favorable to increasing the leakproofness of annotating the cooperation between liquid hole d and the sealed nail and the fastening nature of connection.
Specifically, the sealing member 40 is configured to be urged away from the pour hole d by the air pressure when the air pressure in the accommodating space 111 is greater than a preset pressure.
That is to say, for the tight fit between sealed nail and the notes liquid hole d, when the atmospheric pressure value in accommodation space 111 is greater than the preset atmospheric pressure value that electric core 100 can bear, because there is the pressure differential in electric core 100 inside (the one side that shell 11 inner wall was located) and outside (the one side that shell 11 outer wall was located), sealed nail can pop out under the effect of pressure differential and annotate liquid hole d. For example, if the air pressure inside the accommodating space 111 is greater than a predetermined value (0.2Mpa), the sealing nail can be ejected to release the pressure inside.
From this, when sealed nail is greater than predetermined atmospheric pressure in accommodation space 111 inside atmospheric pressure, sealed nail can be popped out and annotate liquid hole d, annotates the effect that liquid hole d has the pressure release, can effectively avoid accommodation space 111 internal pressure too big electric core 100's that leads to explosion, can increase the security of electric core 100 use.
In detail, the housing 11 further has a protrusion 113 located on the side wall and a bending portion 114 located on the top, the protrusion 113 is adapted to press the side wall of the insulating cover 121 or press the bottom wall of the insulating cover 121, and the bending portion 114 presses the insulating cover 121 at the top end of the insulating cover 121. The metal framework 122 is an annular metal plate, the top end of the insulating cover plate 121 is provided with an annular accommodating groove b and a boss c arranged in the accommodating groove b, the liquid injection hole d penetrates through the boss c, the metal framework 122 is located in the accommodating groove b, and the metal framework 122 is provided with an avoiding hole a for the boss c to pass through.
As shown in fig. 1 and 4, the inner wall of the housing 11 has a protrusion 113 formed by rolling the outer wall, or the protrusion 113 is integrally formed with the housing 11 on the inner wall of the housing 11 when the housing 11 is manufactured, and the protrusion 113 abuts against the side wall of the insulating cover 121 during the assembly of the composite cover plate 12 with the housing 11, or the protrusion 113 contacts with the bottom end (end near the winding core 50) of the insulating cover 121 and supports the insulating cover 121.
As shown in fig. 5 and 9, the side of the insulating cover plate 121 away from the winding core 50 is provided with a receiving groove b, a boss c is disposed in the receiving groove b, and the liquid injection hole d is disposed on the boss c and penetrates through the boss c and the insulating cover plate 121 contacting with the boss c. Holding tank b can with cyclic annular metal sheet adaptation, and cyclic annular metal sheet is provided with dodges hole an, at the in-process of cyclic annular metal sheet with holding tank b adaptation, dodges hole an and can cooperate with boss c, and boss c does not influence the installation of cyclic annular metal sheet. The top of the outer shell 11 is further provided with a bending portion 114, and the bending portion 114 gradually approaches the winding center of the winding core 50 and stops against the end face of the composite cover plate 12 in the process of extending from the bottom end to the top end of the outer shell 11.
From this, set up bellying 113 at the inner wall of shell 11, set up the dodging hole an of dodging boss c in boss c and the holding tank b set up in holding tank b, can increase compactness and the fastness of being connected between insulating cover plate 121 and the shell 11, improve the efficiency of annotating the liquid of liquid hole d, spill when avoiding annotating the liquid and pollute utmost point post 13 and partial composite cover board 12, the dodging hole an of seting up can be convenient for with boss c adaptation, increase the inseparable degree of cyclic annular metal sheet and the laminating of holding tank b, with the structure of optimizing composite cover board 12, improve composite cover board 12's structural strength.
The battery cell 100 according to the embodiment of the second aspect of the present invention includes the cap electrolyte injection structure 10 in any one of the above embodiments.
It can be understood that, an accommodating groove b for accommodating the annular metal plate is provided on the insulating cover plate 121, and a protruding boss c is provided in the accommodating groove b, the avoiding hole a provided on the annular metal plate can allow the boss c to pass through, and the boss c has guiding and positioning functions, so that the annular metal plate can be completely matched with the accommodating groove b. The composite cover 12 is fitted to the inner wall of the housing 11, and specifically, a protrusion 113 is disposed on the inner wall of the housing 11, and may abut against the sidewall of the insulating cover 121, or the insulating cover 121 is located above the protrusion 113 and can be supported by the protrusion 113. The one end of the utmost point post 13 that is located the center of compound apron 12 is connected with the negative pole ear on rolling up core 50 through negative pole switching piece 30, and the one end that rolls up core 50 and deviates from to accord with the apron is connected with anodal ear through anodal switching piece 20, and the free end of anodal switching piece 20 ends to support on the diapire of shell 11. After the composite cover plate 12 is assembled with the outer shell 11, the bending portion 114 provided at the top of the outer shell 11 can be bent to abut against the top end of the composite cover plate 12.
From this, set up boss c in holding tank b and be used for seting up notes liquid hole d, avoid on spilling electrolyte to holding tank b or utmost point post 13 when annotating the liquid, influence the life of insulating apron 121 and utmost point post 13, the hole an of dodging of seting up on the cyclic annular metal sheet helps dodging boss c, makes cyclic annular metal sheet and holding tank b adaptation degree higher, the compactness of connection is higher. When the liquid injection hole d is sealed, the sealing element 40 can completely seal the liquid injection hole d, and can be ejected when the internal air pressure of the accommodating space 111 is too high, so that the risk of bursting of the battery cell 100 due to the too high internal air pressure is reduced, and the use safety of the battery cell 100 is improved.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.
In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features. In the description of the present invention, "a plurality" means two or more. In the description of the present invention, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween. In the description of the utility model, "above", "over" and "above" a first feature in a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean 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, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The utility model provides a structure is annotated to top cap of electricity core which characterized in that includes:
the winding device comprises a shell, a winding core and an electrolyte, wherein a containing space for containing the winding core and the electrolyte is arranged in the shell, and the top end of the shell is open and forms an assembling port;
the composite cover plate comprises an insulating cover plate and a metal framework which are connected with each other, the composite cover plate is connected with the shell at the assembly opening and seals the accommodating space, the insulating cover plate is an elastic piece, and the side wall of the insulating cover plate is in extrusion fit with the inner wall of the shell;
the pole column penetrates through the insulating cover plate, extends into the accommodating space and is electrically connected with the winding core;
the composite cover plate is provided with a liquid injection hole communicated with the containing space, the liquid injection hole is positioned on the outer side of the pole, a sealing element is inserted into the liquid injection hole, and the sealing element is tightly matched with the inner wall of the liquid injection hole.
2. The top cap liquid injection structure of the battery cell of claim 1, wherein the liquid injection hole is in an inverted cone shape.
3. The top cap liquid injection structure of the battery cell of claim 2, wherein the sealing member is a sealing nail, and the sealing member comprises:
the nail body is cylindrical and is inserted into the liquid injection hole;
the nail head is in an inverted cone shape and is used for resisting against the end face of the insulating cover plate.
4. The top cap electrolyte injection structure of the battery cell of any of claims 1 to 3,
the one end of rolling up the core is anodal ear, the other end is the negative pole ear, roll up the negative pole ear of core with utmost point post passes through the negative pole switching piece and connects, roll up the anodal ear of core with the bottom of shell is connected, the negative pole switching piece includes: the bus bar comprises a bus bar disc and a connecting sheet, wherein the connecting sheet is provided with at least one bent part;
the liquid injection hole is positioned on the end face of the winding core, and the projection of the liquid injection hole on the end face of the winding core is staggered with the projection of the connecting piece on the end face of the winding core.
5. The top cap electrolyte injection structure of the battery cell of any of claims 1 to 3,
the distance between the liquid injection hole and the pole is larger than 3 mm.
6. The top cap liquid injection structure of the battery cell of any one of claims 1 to 3, wherein the diameter of the liquid injection hole is 2mm to 20 mm.
7. The battery cell top cap liquid injection structure of claim 6, wherein the diameter of the liquid injection hole is 0.1mm to 2mm smaller than the diameter of the sealing nail.
8. The top cap liquid injection structure of the battery cell of claim 1, wherein the sealing member is configured to be driven to be separated from the liquid injection hole by air pressure when the air pressure in the accommodating space is greater than a preset pressure.
9. The top cap electrolyte injection structure of the battery cell according to claim 1, wherein the casing further has a protrusion portion located on a side wall and a bent portion located on a top portion, the protrusion portion is adapted to press the side wall of the insulating cover plate or press a bottom wall of the insulating cover plate, and the bent portion presses the insulating cover plate at a top end of the insulating cover plate; metal framework is cyclic annular metal sheet, the top of insulating apron has annular holding tank and locates boss in the holding tank, annotate the liquid hole and run through the boss, metal framework is located in the holding tank, metal framework has the confession the hole of dodging that the boss passed.
10. A battery cell comprising the cap injection structure of any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121481746.0U CN215816316U (en) | 2021-06-30 | 2021-06-30 | Top cap liquid injection structure of battery cell and battery cell |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121481746.0U CN215816316U (en) | 2021-06-30 | 2021-06-30 | Top cap liquid injection structure of battery cell and battery cell |
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| CN215816316U true CN215816316U (en) | 2022-02-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114597557A (en) * | 2022-03-14 | 2022-06-07 | 广州鹏辉能源科技股份有限公司 | Power battery for electric automobile and preparation method thereof |
| CN115799775A (en) * | 2022-12-09 | 2023-03-14 | 厦门海辰储能科技股份有限公司 | End cover assembly, energy storage device and electric equipment |
-
2021
- 2021-06-30 CN CN202121481746.0U patent/CN215816316U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114597557A (en) * | 2022-03-14 | 2022-06-07 | 广州鹏辉能源科技股份有限公司 | Power battery for electric automobile and preparation method thereof |
| CN114597557B (en) * | 2022-03-14 | 2022-12-13 | 广州鹏辉能源科技股份有限公司 | Power battery for electric automobile that contains fastening shell |
| CN115799775A (en) * | 2022-12-09 | 2023-03-14 | 厦门海辰储能科技股份有限公司 | End cover assembly, energy storage device and electric equipment |
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Address after: 361100 201-1, complex building 5, No. 11, Butang Middle Road, torch high tech Zone (Tongxiang) industrial base, Xiamen, Fujian Province Patentee after: Xiamen Haichen Energy Storage Technology Co.,Ltd. Address before: Room 201-2, Comprehensive Building 5#, No. 11, Butang Middle Road, Industrial Base, Xiamen Torch High-tech Zone (Tongxiang), Xiamen City, Fujian Province, 361012 Patentee before: Xiamen Haichen New Energy Technology Co.,Ltd. |
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