CN218731368U

CN218731368U - Energy storage element monomer structure

Info

Publication number: CN218731368U
Application number: CN202222856784.0U
Authority: CN
Inventors: 车玲娟; 孙玉平; 孙伟; 王俊华
Original assignee: Gmcc Electronic Technology Wuxi Co ltd
Current assignee: Gmcc Electronic Technology Wuxi Co ltd
Priority date: 2022-10-28
Filing date: 2022-10-28
Publication date: 2023-03-24
Anticipated expiration: 2032-10-28

Abstract

The utility model discloses an energy storage element monomer structure, wherein an electric core is inserted in a shell, the electric core is connected with a current collector, and the upper end part of the shell is provided with a cover plate; a pole part and a current collecting part are integrally designed on the current collector, the pole part is arranged on the cover plate in a penetrating way, and the current collecting part is fixed on the top surface of the battery cell; a first sealing element is arranged between the cover plate and the pole part, and the first sealing element is sleeved on the periphery of the pole part; the first sealing element is provided with a groove with a downward opening, the side surface of the groove, which is close to one side of the pole part, is a first inclined surface, and the first inclined surface inclines downwards and inwards from top to bottom. The utility model discloses a first sealing member between apron and the pole portion closely pastes tightly on the apron under the free interior pressure effect of energy storage component, and the free interior pressure of energy storage component is big more, and the radial inward component of production just is big more, and sealed effect is better, and the sealing reliability is high more, has reduced the processing requirement of pole portion.

Description

Energy storage element monomer structure

Technical Field

The utility model belongs to the technical field of the energy storage component technique and specifically relates to an energy storage component monomer structure.

Background

The energy storage element is widely applied to vehicles, electronic products, energy storage systems, transportation, smart power grids, industrial energy conservation and consumption reduction and other industries, and the energy storage element technology is an important factor related to the development of the energy storage element technology. The energy storage element monomer generally comprises a positive electrode, a negative electrode, a shell, an electrolyte, a cover plate, a pole and the like.

In the prior art, an electrode assembly inside an energy storage element monomer is electrically connected with a pole column through a current collecting sheet, the pole column and the current collecting sheet are respectively and independently designed and processed and then fixedly connected through welding, and therefore the processing procedure and the installation procedure are relatively complex and the cost is relatively high; and non-energy storage elements such as the current collecting sheet, the pole and the like need to occupy the limited space in the energy storage element monomer, so that the space of the energy storage element is reduced, the utilization rate of the internal space of the energy storage element monomer is reduced, and the energy density of the energy storage element monomer is reduced.

The conventional sealing gasket is generally adopted for sealing between the single pole and the cover plate of the existing energy storage element, extra radial force is not applied between the sealing gasket and the pole, the requirement on the dimensional accuracy of the inner peripheral surface of the sealing gasket and the outer peripheral surface of the pole is high in order to ensure that the inner peripheral surface of the sealing gasket is tightly attached to the outer peripheral surface of the pole to realize sealing, and if the dimensional deviation is large, the tightness between the sealing gasket and the pole is possibly insufficient, so that the sealing effect is influenced, and the sealing reliability is reduced. The single shell of current energy storage component is usually fixed through welded with the apron, does not set up the sealing member between the two usually, also influences the inside sealing performance of energy storage component, and sealing reliability is high inadequately.

SUMMERY OF THE UTILITY MODEL

The applicant provides an energy storage element monomer structure with a reasonable structure aiming at the problems of the existing energy storage element monomer, so that the internal space utilization rate of the energy storage element is improved, the energy density is improved, and the sealing reliability is improved.

The utility model discloses the technical scheme who adopts as follows:

a single structure of an energy storage element is characterized in that a battery cell is inserted in a shell, a current collector is connected to the battery cell, and a cover plate is arranged at the upper end part of the shell; a pole part and a current collecting part are integrally designed on the current collector, the pole part is arranged on the cover plate in a penetrating way, and the current collecting part is fixed on the top surface of the battery cell; a first sealing element is arranged between the cover plate and the pole part, and the first sealing element is sleeved on the periphery of the pole part; the first sealing element is provided with a groove with a downward opening, the side surface of the groove, which is close to one side of the pole part, is a first inclined surface, and the first inclined surface inclines downwards and inwards from top to bottom.

As a further improvement of the above technical solution:

the first sealing element is a V-shaped ring or a Y-shaped ring, a V-shaped groove with a downward opening is formed in the lower portion of the first sealing element, and two side faces of the V shape are symmetrically arranged.

The lower part of the first sealing element is provided with a trapezoidal groove with an opening facing downwards and a small upper part and a large lower part.

The current collector is also integrally provided with a transition connecting part, and the pole post part is connected with the current collecting part through the transition connecting part.

The bottom surface of the battery cell is fixedly bonded on the bottom surface of the shell through conductive adhesive; or the battery cell is fixedly connected to the bottom surface of the shell in a soldering, resistance welding or laser welding mode.

The upper end part of the shell is provided with a support ring and a flanging, and the cover plate is positioned between the support ring and the flanging.

A second sealing element is arranged between the outer peripheral surface of the cover plate and the inner peripheral surface of the shell.

The second sealing element is an O-shaped ring.

The cover plate is provided with a counter bore, and the first sealing element is arranged in the counter bore.

The cover plate is made of an insulating material.

The utility model has the advantages as follows:

(1) The utility model discloses a first sealing member between apron and the pole portion closely pastes tightly on the apron under the free interior pressure effect of energy storage component, the effort of simultaneously acting on its first inclined plane has a radial inward component force, this radial inward component force closely compresses tightly the inside portion of first sealing member to the pole portion and realizes sealedly, the free interior pressure of energy storage component is big more, the radial inward component force that produces just is big more, first sealing member just is compressed tightly on the pole portion more, and the degree of closeness between the pole portion just is high more, sealing effect is better, the sealing reliability is high; and because of the action of the radial component force, even if the size of the outer peripheral surface of the pole part is slightly deviated, the first sealing element can be pressed onto the pole part under the action of the radial component force, the sealing effect is not influenced, the sealing reliability is high, and the processing requirement of the pole part is reduced. The current collector of the utility model integrates the pole part and the current collecting part into one piece, thereby saving elements, saving assembling procedures and reducing material cost and manufacturing cost; moreover, compared with the independent design and assembly mode in the prior art, the pole part and current collecting part integrated design can avoid the condition that the transmission performance is influenced due to poor contact in the assembly process, and the transmission is more reliable and better.

(2) The electric core of the utility model is directly contacted with the shell to realize electric conduction, thus saving the use of the anode adapter collector, shortening the circulation formation of current and improving the power transmission performance; the adapter collecting piece is saved, the space occupation of the non-energy storage element is reduced, the occupied space of the energy storage element is increased, the space utilization rate in the shell is increased, and therefore the energy density of the energy storage element is increased.

Drawings

Fig. 1 is a sectional view of the present invention.

Fig. 2 is an enlarged view of a portion a in fig. 1.

Fig. 3 is an enlarged view of a portion B in fig. 1, in which a force receiving direction of the first seal member and a direction of a force component thereof are indicated by dotted line arrows.

FIG. 4 is a schematic view of another embodiment of the first seal.

FIG. 5 is a schematic view of another embodiment of the first seal.

Fig. 6 is a flow chart of the manufacturing process of the present invention.

In the figure: 1. a housing; 11. a support ring; 12. flanging; 2. an electric core; 3. a current collector; 31. a pole section; 32. a transition connection; 33. a current collecting portion; 4. a cover plate; 41. a counter bore; 42. a sealing groove; 5. a first seal member; 51. a groove; 52. a first inclined plane; 53. a second inclined plane; 6. a second seal.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1, a casing 1 of the present invention is a cylinder with an open top surface and a closed bottom surface, a cylindrical electrical core 2 is inserted into the casing 1, a current collector 3 is connected to the top of the electrical core 2, a cover plate 4 is sleeved on the periphery of the current collector 3, and the cover plate 4 is fixed on the upper end of the casing 1; be provided with first sealing member 5 between apron 4 and the mass flow body 3, be provided with second sealing member 6 between apron 4 and the shell 1, apron 4 adopts insulating material.

As shown in fig. 1, the bottom surface (positive electrode) of the battery cell 2 is fixed on the bottom surface of the casing 1 by conductive adhesive, and is electrically conducted with the casing 1 by conductive adhesive; the electric core 2 can also be fixedly connected to the bottom surface of the shell 1 by means of soldering, resistance welding or laser welding and is directly and electrically communicated with the shell 1. The electric core 2 is directly contacted with the shell 1 to realize electric conduction, so that the use of a positive pole adapter collector is saved, the circulation of current is shortened, and the power transmission performance is improved; and the adapter collecting piece is saved, the space occupation of the non-energy storage element is reduced, the occupied space of the energy storage element is improved, the space utilization rate in the shell 1 is improved, and therefore the energy density of the energy storage element is improved.

As shown in fig. 1 and fig. 2, a ring-shaped support ring 11 is formed at the upper end of the housing 1 and is recessed radially inward below the cover plate 4, a ring-shaped flange 12 is formed at the upper side of the housing 1 and is folded radially inward by 90 degrees above the cover plate 4, the cover plate 4 is pressed onto the support ring 11 by the flange 12, and the support ring 11 cooperates with the flange 12 to axially position the cover plate 4 and fix the cover plate 4 on the housing 1. A circle of sealing groove 42 is formed in the peripheral surface of the cover plate 4, and the second sealing element 6 is sleeved in the sealing groove 42 and seals a fit clearance between the cover plate 4 and the shell 1, so that the sealing performance of the energy storage element is improved, and the sealing reliability is higher; the second sealing member 6 is an O-shaped ring. In other embodiments, the sealing groove 42 may be formed on the joint surface of the cover plate 4 with the support ring 11 and the flange 12.

As shown in fig. 1 and 3, the current collector 3 is formed by sequentially connecting a pole part 31, a transition connection part 32 and a current collecting part 33 from top to bottom, and the pole part 31, the transition connection part 32 and the current collecting part 33 are integrally designed; the pole part 31 is a cylinder with the peripheral surface and the top surface closed, the transition connection part 32 is a circular boss with an L-shaped cross section, and the collecting part 33 is a circular slice. The pole part 31 extends out from the center of the cover plate 4, and the current collecting part 33 is welded and fixed on the top surface of the battery core 2. The pole column part 31 and the current collecting part 33 of the current collector 3 are integrally designed on one piece, so that the components are saved, the assembly process is saved, and the material cost and the manufacturing cost are reduced; compared with the independent design and assembly mode in the prior art, the integration design of the pole part 31 and the current collecting part 33 can avoid the condition that the transmission performance is influenced due to poor contact in the assembly process, and the transmission is more reliable and better.

As shown in fig. 1 and 3, a counterbore 41 is formed below the central through hole of the cover plate 4 and outside the pole portion 31, and the first seal 5 is disposed in the counterbore 41 and fitted around the outer periphery of the pole portion 31. The first sealing element 5 is a V-shaped ring, a V-shaped groove 51 with a downward opening is formed in the lower side surface of the first sealing element, a first inclined surface 52 is arranged on the side surface of the groove 51 close to the pole part 31, a second inclined surface 53 is arranged on the other opposite side surface of the groove 51, the first inclined surface 52 and the second inclined surface 53 are symmetrically arranged, the first inclined surface 52 is inclined downward from top to bottom, and the second inclined surface 53 is inclined downward from top to bottom. As can be seen from the dotted line arrows in fig. 3, the first sealing member 5 tightly abuts against the cover plate 4 under the internal pressure of the energy storage element unit, and at the same time, the acting force acting on the first inclined surface 52 has a radially inward component that tightly presses the inner side portion of the first sealing member 5 against the pole portion 31 to achieve sealing, and the greater the internal pressure of the energy storage element unit, the greater the generated radially inward component, the closer the first sealing member 5 is pressed against the pole portion 31 and the pole portion 31 is, the better the sealing effect is, and the higher the sealing reliability is; in addition, even if the outer peripheral surface of the pole part 31 has a slight variation in size due to the radial component force, the first seal 5 can be pressed against the pole part 31 by the radial component force, and the sealing effect is not affected, and the sealing reliability is high.

In another embodiment, as shown in fig. 4, the first sealing member 5 may also be a Y-shaped ring, a V-shaped groove 51 with a downward opening is formed in a lower portion of the Y-shaped ring, a side surface of the groove 51 near the pole portion 31 is a first inclined surface 52, another opposite side surface is a second inclined surface 53, the first inclined surface 52 and the second inclined surface 53 are symmetrically arranged, the first inclined surface 52 is inclined inward from top to bottom, and the second inclined surface 53 is inclined outward from top to bottom.

In another embodiment, as shown in fig. 5, a trapezoidal groove 51 with a downward opening and a small upper portion and a large lower portion may be formed in a lower portion of the annular first sealing member 5, a side surface of the groove 51 on a side close to the pole portion 31 is a first inclined surface 52, another side surface symmetrically disposed is a second inclined surface 53, the first inclined surface 52 is inclined inward from top to bottom, and the second inclined surface 53 is inclined outward from top to bottom.

Of course, in other embodiments, the first seal 5 may also be provided with a recess 51 having another shape with a downward opening, as long as the side of the recess 51 close to the pole part 31 has a first inclined surface 52 inclined downward from top to bottom, so as to achieve the purpose of generating a radially inward component force to press the first seal 5 onto the pole part 31 under the action of the internal pressure.

Adopt the water logging method right energy storage element monomer carry out airtight test and verify its leakproofness: connecting the energy storage element monomer with an air pipe, wherein the air pipe is communicated with the interior of the energy storage element monomer, and a barometer is arranged on the air pipe; the energy storage element monomer is put into water, the air pipe is ventilated, the air pressure value of the air pressure gauge is adjusted to be changed within the range of 0.1-0.45 Mpa (0.45 Mpa is the maximum air pressure of an experimental air source), when the air pressure reaches 0.45Mpa, 30s is kept, no bubbles are generated in the water, and therefore the fact that gas does not leak from the energy storage element monomer even when the energy storage element monomer is subjected to the maximum internal pressure (0.45 Mpa) is proved, the single energy storage element monomer also has good sealing performance and high sealing reliability when being subjected to the large internal pressure is proved.

As shown in fig. 6, the energy storage element unit of the present invention is manufactured mainly according to the following steps:

(I) Element manufacturing: manufacturing elements such as a shell 1, a battery core 2, a current collector 3, a cover plate 4, a first sealing element 5, a second sealing element 6 and the like according to design and processing requirements, wherein the first sealing element 5 and the second sealing element 6 are arranged in a counter bore 41 and a sealing groove 42 of the cover plate 4; when the shell 1 is manufactured, only the support ring 11 is machined and formed firstly, and the flanging 12 is not machined and formed temporarily in the step;

(II) installing the battery core 2 and the current collector 3: after the element is manufactured, the battery cell 2 can be connected with the shell 1, and then the current collector 3 is installed, or the battery cell 2 can be connected with the current collector 3, and then the battery cell 2 and the current collector 3 are installed in the shell 1 and connected with the shell 1;

when the battery cell 2 and the shell 1 are connected firstly and then the current collector 3 is installed, firstly, the battery cell 2 is inserted into the shell 1, and is bonded or welded and fixed on the shell 1 through conductive adhesive, and then the current collector 3 is welded and fixed on the top surface of the battery cell 2;

when the battery cell 2 and the current collector 3 are connected firstly and then the shell 1 is connected, the current collector 3 is welded and fixed on the end surface of the battery cell 2, then the battery cell 2 is inserted into the shell 1 and is bonded or welded and fixed on the shell 1 through the conductive adhesive;

(III) liquid injection: after the current collector 3 is assembled, injecting electrolyte into the shell 1 from the open surface of the top of the shell 1 through the injection device;

(IV) installing a cover plate 4: after the liquid injection is finished, the cover plate 4 is arranged at the upper end part of the shell 1, and the pole part 31 of the current collector 3 penetrates through the central hole of the cover plate 4; the bottom surface of the cover plate 4 is abutted against the support ring 11 of the shell 1;

(V) rolling and flanging 12 of the shell 1: after the cover plate 4 is installed, the edge of the upper side of the shell 1 is radially and inwardly rolled to form a flange 12 through a rolling device, and the cover plate 4 is pressed on the support ring 11, so that the cover plate 4 is fixed on the shell 1;

(VI) finished product: and after the flanging 12 is rolled, obtaining a finished product of the energy storage element monomer.

The energy storage element monomer of the utility model is manufactured by adopting the mode of filling liquid first and then packaging the cover plate 4, and the liquid filling hole does not need to be processed on the cover plate 4, thereby simplifying the processing procedure of the cover plate 4, saving the use and the plugging procedure of an additional plugging piece, reducing the time and the manufacturing procedure of the element, and saving the material cost and the manufacturing cost; during liquid injection, the whole open surface of the shell 1 is used as a liquid injection port, the area of the liquid injection port is larger, the liquid injection can be completed more quickly, the liquid injection time is reduced, and the liquid injection efficiency is improved; moreover, the whole open face of the shell 1 is a liquid injection port, the liquid injection area covers the whole cross section of the shell 1, the electrolyte can be injected into each part of the cavity of the shell 1 uniformly and rapidly through the liquid injection port, the electrolyte is distributed more uniformly in the shell 1, and the energy density of the energy storage element is higher.

The above description is illustrative of the present invention and is not intended to limit the present invention, and the present invention may be modified in any manner without departing from the spirit of the present invention.

Claims

1. An energy storage element single body structure is characterized in that a battery cell (2) is inserted into a shell (1), a current collector (3) is connected onto the battery cell (2), and a cover plate (4) is arranged at the upper end part of the shell (1); the method is characterized in that: a pole part (31) and a current collecting part (33) are integrally designed on the current collector (3), the pole part (31) is arranged on the cover plate (4) in a penetrating way, and the current collecting part (33) is fixed on the top surface of the battery cell (2); a first sealing element (5) is arranged between the cover plate (4) and the pole part (31), and the first sealing element (5) is sleeved on the periphery of the pole part (31); a groove (51) with a downward opening is formed in the first sealing element (5), a first inclined surface (52) is arranged on the side surface, close to the pole part (31), of the groove (51), and the first inclined surface (52) inclines inwards from top to bottom in an inclined mode.

2. The energy storage element cell structure of claim 1, wherein: the first sealing element (5) is a V-shaped ring or a Y-shaped ring, a V-shaped groove (51) with a downward opening is formed in the lower portion of the first sealing element (5), and two side faces of the V shape are symmetrically arranged.

3. The energy storage element cell structure of claim 1, wherein: the lower part of the first sealing element (5) is provided with a trapezoidal groove (51) with an opening facing downwards and a small upper part and a large lower part.

4. The energy storage element cell structure of claim 1, wherein: a transition connecting part (32) is integrally designed on the current collector (3), and the pole part (31) is connected with the current collecting part (33) through the transition connecting part (32).

5. The energy storage element cell structure of claim 1, wherein: the bottom surface of the battery cell (2) is fixedly bonded on the bottom surface of the shell (1) through conductive adhesive; or the battery core (2) is fixedly connected to the bottom surface of the shell (1) in a soldering, resistance welding or laser welding mode.

6. The energy storage element cell structure of claim 1, wherein: the upper end of the shell (1) is provided with a support ring (11) and a flanging (12), and the cover plate (4) is positioned between the support ring (11) and the flanging (12).

7. The energy storage element cell structure of claim 1, wherein: a second sealing element (6) is arranged between the outer circumferential surface of the cover plate (4) and the inner circumferential surface of the shell (1).

8. The energy storage element cell structure of claim 7, wherein: the second sealing element (6) is an O-shaped ring.

9. The energy storage element cell structure of claim 1, wherein: a counter bore (41) is formed in the cover plate (4), and the first sealing element (5) is arranged in the counter bore (41).

10. The energy storage element cell structure of claim 1, wherein: the cover plate (4) is made of an insulating material.