CN115764177A

CN115764177A - Connection structure of current collector and cover plate and energy storage element monomer structure

Info

Publication number: CN115764177A
Application number: CN202211332946.9A
Authority: CN
Inventors: 孙玉平; 车玲娟; 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: 2023-03-07

Abstract

The invention discloses a connection structure of a current collector and a cover plate and an energy storage element monomer structure, wherein the current collector is connected to a battery cell, the battery cell is inserted into a shell, the current collector comprises a pole part and a current collection part, a plurality of positioning sheets and a plurality of holes are arranged on the surface of the current collection part, and the plurality of positioning sheets are vertically arranged on the current collection part and are arranged on the periphery of the pole part; a plurality of second positioning grooves are formed in the cover plate, the second positioning grooves correspond to the positioning pieces, and the positioning pieces are inserted into the second positioning grooves. The positioning structures are arranged between the current collector and the cover plate, and are used for respectively positioning the current collector and the cover plate in the axial direction, the circumferential direction and the radial direction, and when the current collector is fixed with the battery cell and then is assembled with the cover plate in the radial direction, the relative positions of the current collector and the cover plate can be determined through the positioning structures of the current collector and the cover plate, so that the deviation of the relative positions of the current collector and the cover plate can be prevented, the distribution uniformity of the peripheral space of the battery cell is ensured, and the energy density of an energy storage element is improved.

Description

Connection structure of current collector and cover plate and energy storage element monomer structure

Technical Field

The invention relates to the technical field of energy storage elements, in particular to a connection structure of a current collector and a cover plate and an energy storage element single body 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, there is usually no positioning structure between the single current collector, the pole and the cover plate of the energy storage element, and when assembling, the relative positions of the current collector, the pole and the cover plate are easy to shift, so that the spatial distribution of the periphery of the battery cell is not uniform, and the energy density of the energy storage element is further influenced. The pole and the current collector of the energy storage element monomer are respectively and independently designed and processed and then fixedly connected by welding, so that the processing procedure and the installation procedure are relatively complicated, and the cost is relatively high; and non-energy storage elements such as a current collector, a 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.

Disclosure of Invention

The applicant aims at the defects of the existing energy storage element monomer, and provides a connection structure of a current collector and a cover plate with a reasonable structure and an energy storage element monomer structure.

The technical scheme adopted by the invention is as follows:

a current collector and connection structure of the cover plate, the current collector includes pole column portion and current collecting department, the pole column portion is set up in the central authorities of current collecting department vertically, the pole column portion is worn to set up on the cover plate, the pole column portion is equipped with the retaining ring to position from the position overcoat that the cover plate wears out; a first sealing element is arranged between the pole part and the cover plate, and the first sealing element is sleeved on the periphery of the pole part; the plate surface of the current collecting part is provided with a plurality of positioning sheets and a plurality of holes, and the positioning sheets are vertically arranged on the current collecting part and are arranged on the periphery of the pole part; a plurality of second positioning grooves are formed in the cover plate, the second positioning grooves correspond to the positioning pieces, and the positioning pieces are inserted into the second positioning grooves.

As a further improvement of the above technical solution:

the positioning piece is formed by tearing off the plate surface of the current collecting part and bending upwards, and the bottom side edge of the positioning piece is connected with the plate surface of the current collecting part; the current collecting part is correspondingly provided with an opening at the tearing part of the positioning sheet.

The pole column part, the flow collecting part and the positioning piece are integrally formed.

The outer peripheral surface of the pole part is provided with a first positioning groove, and the check ring is clamped in the first positioning groove.

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 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 part of the first sealing element, and two side surfaces of the V shape are symmetrically arranged; or the lower part of the first sealing element is provided with a trapezoidal groove with an opening facing downwards and being small at the top and big at the bottom.

A counter bore is formed in the cover plate, and the first sealing element is arranged in the counter bore; the cover plate is made of an insulating material.

The utility model provides an energy storage component monomer structure, adopts the connection structure of above-mentioned mass flow body and apron, and the mass flow body is connected on electric core, and the shell is inserted to electric core.

As a further improvement of the above technical solution:

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 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 invention has the following beneficial effects:

(1) The positioning structures are arranged between the current collector and the cover plate, the current collector and the cover plate are respectively positioned in the axial direction, the circumferential direction and the radial direction, and when the current collector is fixed with the battery cell and then is assembled with the cover plate in the radial direction, the relative positions of the current collector (and the battery cell) and the cover plate 4 can be determined through the positioning structures of the current collector and the battery cell, so that the relative positions of the current collector (and the battery cell) and the cover plate are prevented from being deviated, the distribution uniformity of the peripheral space of the battery cell is ensured, and the energy density of the energy storage element is improved. The pole post part, the current collecting part and the positioning sheet of the current collector are integrally formed, and when the positioning sheet is processed, the opening hole is also processed at the same time, and the opening hole can be used as a liquid injection hole, so that the processing procedure is saved, the processing difficulty is reduced, and the processing cost is reduced; the pole part and the current collecting part are integrally designed on one piece by the current collector, so that the element is saved, the assembly process is saved, the material cost and the manufacturing cost are reduced, and compared with an independent design and assembly mode in the prior art, the integrated design avoids the problem that the power transmission performance is influenced due to poor contact in the assembly process, the power transmission is more reliable, and the power transmission performance is better. The outer peripheral surface of the pole part is provided with a first positioning groove.

(2) The first sealing element between the cover plate and the pole part is tightly attached to the cover plate under the action of the internal pressure of the energy storage element monomer, meanwhile, the acting force acting on the first inclined surface of the first sealing element has a radially inward component force, the radially inward component force tightly presses the inner side part of the first sealing element to the pole part to realize sealing, the larger the internal pressure of the energy storage element monomer is, the larger the generated radially inward component force is, the closer the first sealing element is to the pole part, the higher the close degree between the first sealing element and the pole part is, the better the sealing effect is, and the higher the sealing reliability is; 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.

(3) The battery cell is directly contacted with the shell 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; 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 an exploded view of the present invention.

Fig. 2 is a cross-sectional view of the present invention.

Fig. 3 is an enlarged view of a portion a in fig. 2.

Fig. 4 is a perspective view of a current collector.

Fig. 5 is a perspective view of the cover plate.

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 collecting portion; 33. positioning plates; 34. opening a hole; 35. a first positioning groove; 4. a cover plate; 41. a counter bore; 42. a sealing groove; 43. a second positioning groove; 5. a first seal member; 51. a groove; 52. a first inclined plane; 53. a second inclined plane; 6. a second seal member; 7. and a retainer ring.

Detailed Description

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

As shown in fig. 1 and 2, a casing 1 of the invention is a cylinder with an open top surface and a closed bottom surface, a cylindrical battery cell 2 is inserted into the casing 1, the top of the battery cell 2 is connected with a current collector 3, a cover plate 4 is sleeved on the periphery of the current collector 3, and the cover plate 4 is fixed at 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 bonding with a conductive adhesive, and is electrically conducted with the casing 1 by the conductive adhesive; the electric core 2 can also be fixedly connected to the bottom surface of the casing 1 by soldering, resistance welding or laser welding, and is directly electrically conducted with the casing 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. 3, 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 flange 12 presses the cover plate 4 onto the support ring 11, 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.

As shown in fig. 1, 2, and 4, the current collector 3 includes a pillar portion 31 and a current collecting portion 32, and the pillar portion 31 is formed to protrude vertically upward from the center of the current collecting portion 32. A plurality of positioning pieces 33 are arranged on the plate surface of the current collecting part 32 and positioned at the periphery of the pole part 31, the positioning pieces 33 are formed by tearing and cracking from the plate surface of the current collecting part 32 and bending upwards for 90 degrees, the positioning pieces 33 vertically protrude on the current collecting part 32, and the bottom side edge of the positioning pieces is connected with the plate surface of the current collecting part 32; on the current collecting part 32, the position torn at the positioning piece 33 corresponds and forms trompil 34, and the trompil 34 can regard as the notes liquid hole of mass flow body 3, and electrolyte can utilize trompil 34 to annotate the liquid, has practiced thrift the process of additionally seting up notes liquid hole, has reduced the processing degree of difficulty, has reduced the processing cost. The pole part 31, the current collecting part 32 and the positioning sheet 33 are integrally formed, and the opening 34 is processed simultaneously when the positioning sheet 33 is processed, so that the processing procedure is saved, and the processing cost is reduced; the current collector 3 integrates and designs the pole part 31 and the current collecting part 32 on one piece, so that the element is saved, the assembly process is saved, the material cost and the manufacturing cost are reduced, and compared with the independent design and assembly mode in the prior art, the integrated design also avoids the problem that the power transmission performance is influenced due to poor contact in the assembly process, the power transmission is more reliable, and the power transmission performance is better. The outer peripheral surface of the pole portion 31 is provided with a first positioning groove 35. As shown in fig. 2 and 3, the pole part 31 passes through the central through hole of the cover plate 4, and the retainer ring 7 is fitted around the part where the pole part 31 passes through the cover plate 4 for positioning. The first positioning groove 35 of the pole part 31 is positioned on the upper side of the cover plate 4, the retainer ring 7 is clamped in the first positioning groove 35, the retainer ring 7 and the first positioning groove 35 are matched to form an axial positioning structure, the current collector 3 is axially positioned, and the current collector 3 is prevented from axially moving.

As shown in fig. 1, 2, and 5, 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 around 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, as shown in fig. 3, a first inclined surface 52 is formed on the side surface of the groove 51 close to the pole portion 31, a second inclined surface 53 is formed on the opposite side surface of the groove, 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. As can be seen from the dotted line arrow 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 force, which 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 is, the greater the generated radially inward component force is, the closer the first sealing member 5 is pressed against the pole portion 31 to the pole portion 31 is, the higher 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, the first sealing element 5 may also be a Y-shaped ring, a V-shaped groove 51 with a downward opening is formed in the lower portion of the Y-shaped ring, a first inclined surface 52 is formed on one side of the groove 51 close to the pole portion 31, a second inclined surface 53 is formed on the other opposite side 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 inward from top to bottom, and the second inclined surface 53 is inclined outward from top to bottom. In another embodiment, a circular ring-shaped or circular ring-shaped trapezoidal groove 51 with a downward opening and a small top and a large bottom may be formed in the lower portion of the first sealing element 5, a first inclined surface 52 is formed on a side surface of the groove 51 close to the pole portion 31, a second inclined surface 53 is formed on the other side surface of the groove 51 that is symmetrically opposite to the pole portion 31, 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 annular first seal 5 may be provided with a groove 51 having another shape with a downward opening, and as long as the groove 51 has a first inclined surface 52 inclined downward from top to bottom on a side close to the pole portion 31, the purpose of pressing the first seal 5 against the pole portion 31 by generating a radially inward component force under the action of the internal pressure can be achieved. The sealing test of the monomer of the energy storage element is carried out by adopting a water immersion method to verify the sealing property: 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.

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.

On the apron 4, be located the counter bore 41 periphery and seted up a plurality of second constant head tank 43, second constant head tank 43 is corresponding with the spacer 33 of the mass flow body 3, and in the spacer 33 inserted second constant head tank 43, spacer 33 and the cooperation of second constant head tank 43 constitute location structure, carry out circumference and radial positioning simultaneously with apron 4 to the mass flow body 3, prevent the mass flow body 3 and apron 4 circumference and radial play. The second positioning slot 43 is a blind hole, which ensures that the cover plate 4 is sealed while the positioning function is realized by matching with the positioning sheet 33.

Be provided with location structure between mass flow body 3 and the apron 4, respectively to the axial of the two, circumference and radially fix a position, after mass flow body 3 is fixed with electric core 2, when radially assembling with apron 4 again, can confirm the relative position of mass flow body 3 (and electric core 2) and apron 4 through the location structure of the two, prevent that the relative position of the two from taking place the skew, guarantee the distribution homogeneity in electric core 2 periphery space, improve energy storage element's energy density.

The foregoing description is illustrative of the present invention and is not to be construed as limiting thereof, as the invention may be modified in any manner without departing from the spirit thereof.

Claims

1. The utility model provides a mass flow body and connection structure of apron which characterized in that: the current collector (3) comprises a pole part (31) and a current collecting part (32), the pole part (31) is vertically arranged in the center of the current collecting part (32), the pole part (31) penetrates through the cover plate (4), and a retainer ring (7) is sleeved outside the part, penetrating out of the cover plate (4), of the pole part (31) for positioning; a first sealing element (5) is arranged between the pole part (31) and the cover plate (4), and the first sealing element (5) is sleeved on the periphery of the pole part (31); the plate surface of the current collecting part (32) is provided with a plurality of positioning sheets (33) and a plurality of openings (34), and the positioning sheets (33) are vertically arranged on the current collecting part (32) and are arranged on the periphery of the pole part (31); a plurality of second positioning grooves (43) are formed in the cover plate (4), the second positioning grooves (43) correspond to the positioning pieces (33), and the positioning pieces (33) are inserted into the second positioning grooves (43).

2. The connection structure of a current collector and a cover plate according to claim 1, wherein: the positioning piece (33) is formed by upward bending after being torn from the plate surface of the current collecting part (32), and the bottom side edge of the positioning piece (33) is connected with the plate surface of the current collecting part (32); the collecting part (32) is provided with an opening (34) corresponding to the tearing part of the positioning sheet (33).

3. The connection structure of a current collector and a cover plate according to claim 1, wherein: the pole part (31), the current collecting part (32) and the positioning piece (33) are integrally formed.

4. The connection structure of a current collector and a cover plate according to claim 1, wherein: a first positioning groove (35) is formed in the outer peripheral surface of the pole part (31), and the retainer ring (7) is clamped in the first positioning groove (35).

5. The current collector and cover plate connection structure of claim 1, wherein: 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 of the groove (51) close to the pole part (31), and the first inclined surface (52) inclines downwards and inwards from top to bottom.

6. The current collector and cover plate connection structure of claim 5, 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 part of the first sealing element (5), and two side surfaces of the V shape are symmetrically arranged; or 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.

7. The current collector and cover plate connection 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); the cover plate (4) is made of an insulating material.

8. An energy storage element monomer structure which characterized in that: the connection structure of the current collector and the cover plate of any one of claims 1 to 7 is adopted, the current collector (3) is connected to the battery cell (2), and the battery cell (2) is inserted into the shell (1).

9. The energy storage element cell structure of claim 8, wherein: the upper end part 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); a second sealing element (6) is arranged between the outer peripheral surface of the cover plate (4) and the inner peripheral surface of the shell (1); the second sealing element (6) is an O-shaped ring.

10. The energy storage element cell structure of claim 8, 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.