CN217405557U

CN217405557U - Top cover assembly and power battery

Info

Publication number: CN217405557U
Application number: CN202220682498.4U
Authority: CN
Inventors: 朱家新; 王�华; 苑丁丁
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-03-22
Filing date: 2022-03-22
Publication date: 2022-09-09
Anticipated expiration: 2032-03-22

Abstract

The utility model discloses a top cap subassembly and power battery, wherein, the top cap subassembly includes the apron, is provided with on the apron and annotates the liquid hole, and one side of apron near electric core is provided with the fender and flows the net, keeps off to flow and has seted up the mesh on the net, keeps off to flow the net and have and annotate the first opening of liquid hole intercommunication. The utility model discloses a top cap subassembly cushions the speed reduction through setting up the electrolyte that the fender stream net was poured into to high speed, thereby reduce the impact force of electrolyte to electric core, most electrolyte can not sputter the inside wall to the casing, most electrolyte can soak electric core downwards from the top of electric core under the effect of gravity, the electrolyte that flows to the casing bottom also can upwards soak electric core from the bottom of electric core simultaneously, electric core two-way capillary action that carries on can reduce the stationary time after annotating the liquid effectively, thereby improve power battery's production efficiency, and can also reduce the risk that the electric core middle part appears not soaking or not fully soaks.

Description

Top cover assembly and power battery

Technical Field

The utility model relates to a battery technology field especially relates to a top cap subassembly and power battery.

Background

Present power battery includes top cap subassembly, aluminum hull and electric core usually, can provide an interior outer isolated sealed environment for electric core after top cap subassembly and the aluminum hull welding, and the interior outer circuit of top cap subassembly connection, carries the outside to electric core internal current through top cap subassembly, plays the water conservancy diversion effect.

The top cover assembly generally includes a top cover and a liquid injection hole disposed on the top cover. Because the position of annotating the liquid hole on the top cap and electric core is just right, when annotating liquid hole to the inside high-speed electrolyte that pours into of aluminum hull into, electrolyte can direct impact electric core, causes the damage to electric core easily.

After the high-speed electrolyte impacts the battery core, most of the high-speed electrolyte is sputtered onto the inner side wall of the shell and converged to the bottom of the aluminum shell, and after liquid injection is completed, the battery core needs to be kept stand for a long time, so that the electrolyte gradually climbs from the bottom of the aluminum shell to infiltrate the whole battery core through capillary action, and the production efficiency is low; secondly, the middle part of the battery cell may be not infiltrated or not fully infiltrated after the standing is finished, so that the lithium precipitation of the power battery occurs in the formation and capacity grading charging processes.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an aim at: the utility model provides a top cap subassembly, its simple structure can slow down the notes liquid speed of electrolyte, reduces the time that the impact force of electrolyte to electric core and electric core were soaked.

The embodiment of the utility model provides a another aim at: the power battery can effectively reduce the risk of non-infiltration or insufficient infiltration in the middle of a battery core, and is high in production efficiency.

To achieve the purpose, the embodiment of the present invention adopts the following technical solutions:

in a first aspect, a liquid injection hole is formed in the cover plate, a flow blocking net is arranged on one side, close to the battery core, of the cover plate, a mesh hole is formed in the flow blocking net, and the flow blocking net is provided with a first opening communicated with the liquid injection hole.

As a preferable scheme of the top cover assembly, the flow blocking net comprises a plurality of sub flow blocking nets, and the plurality of sub flow blocking nets are sleeved layer by layer.

As a preferable mode of the top cover assembly, each of the sub-fluid retaining nets has a plurality of the mesh openings, and the mesh openings of each layer of the sub-fluid retaining net are different in size.

As a preferable mode of the top cap assembly, the mesh openings of the sub-baffling nets located at the inner layer have a size larger than that of the mesh openings of the sub-baffling nets located at the outer layer.

As a preferable scheme of the top cover assembly, two adjacent layers of the sub-flow blocking nets have a gap, and the gap is less than 1 cm.

As a preferable mode of the top cover assembly, the flow blocking net is made of an elastic material.

As a preferable scheme of the top cover assembly, the top cover assembly further comprises a flow baffle plate, the flow baffle plate is connected with the cover plate to form an installation cavity, a plurality of second openings are arranged at intervals on the cavity wall of the installation cavity, the flow baffle net is installed in the installation cavity, and the flow baffle plate is communicated with the inside of the battery shell through the second openings.

As a preferable scheme of the top cover assembly, the flow blocking net is connected with the cover plate or the flow blocking plate by welding; and/or the presence of a gas in the gas,

the flow blocking net is detachably connected with the cover plate or the flow blocking plate.

As a preferable mode of the top cover assembly, the top cover assembly further includes a sealing member, the sealing member includes a first portion and a second portion that are connected, the liquid injection hole is a stepped hole, the liquid injection hole includes a first hole and a second hole that are communicated with each other, the first hole is communicated with the outside of the battery case, the second hole is communicated with the inside of the battery case, the first portion is in clearance fit with the first hole, and the second portion is in interference fit with the second hole.

In a second aspect, a power battery is provided, which includes a casing, an electrical core disposed in the casing, and the above-mentioned top cover assembly, wherein the casing is provided with a through hole, and the top cover assembly blocks the through hole.

The utility model discloses beneficial effect does:

(1) during liquid injection, the electrolyte flows through the flow blocking net through the liquid injection hole, and the flow blocking net can play a certain buffering role on the electrolyte, so that the speed of the electrolyte is reduced, the impact force of the electrolyte on the battery cell is reduced, and the battery cell is not easy to damage;

(2) the impact force of the electrolyte on the battery cell is small, most of the electrolyte cannot be sputtered to the inner side wall of the shell, the battery cell can be downward infiltrated from the top end of the battery cell under the action of gravity, the electrolyte flowing to the bottom of the shell can also be upward infiltrated from the bottom end of the battery cell, and the standing time after liquid injection can be effectively shortened by performing the bidirectional capillary action, so that the production efficiency of the power battery is improved;

(3) the battery cell can improve the infiltration effect of the battery cell by performing the capillary action in two directions, and the risk of non-infiltration or insufficient infiltration in the middle of the battery cell is effectively reduced.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Fig. 1 is a cross-sectional view of the power battery according to the embodiment of the present invention.

Fig. 2 is a schematic structural diagram of the top cover assembly according to an embodiment of the present invention.

Fig. 3 is a partially enlarged view of a portion a in fig. 1.

Fig. 4 is a top view of the cap assembly according to an embodiment of the present invention.

Fig. 5 is a sectional view B-B of fig. 4.

Fig. 6 is a schematic structural diagram of the sealing member according to an embodiment of the present invention.

In the figure:

1. a cap assembly; 11. a cover plate; 111. a liquid injection hole; 1111. a first hole; 1112. a second hole; 12. a flow blocking net; 121. mesh openings; 122. a sub-current blocking net; 13. a flow baffle plate; 14. a mounting cavity; 141. a second opening; 15. a seal member; 151. a first portion; 152. a second portion; 2. a housing; 3. and (5) battery cores.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1, the top cover assembly 1 of the present embodiment is applied to a power battery, and the top cover assembly 1 and a housing 2 of the power battery are hermetically connected to form an internally and externally isolated sealed environment.

Referring to fig. 1 to 3, the top cap assembly 1 includes a cover plate 11, a liquid injection hole 111 is formed on the cover plate 11, a flow blocking net 12 is disposed on a side of the cover plate 11 close to the electric core 3, a mesh 121 is formed on the flow blocking net 12, and the flow blocking net 12 has a first opening (not shown in the figure) communicated with the liquid injection hole 111. By arranging the flow blocking net 12, when the electrolyte is injected into the shell 2 of the power battery at a high speed, the flow blocking net 12 can play a certain buffering role on the electrolyte, so that the speed of the electrolyte is reduced, the impact force of the electrolyte on the electric core 3 is reduced, and the electric core 3 is not easy to damage; and because the impact force of electrolyte to electric core 3 reduces, most electrolyte can not sputter to the inside wall of casing 2, most electrolyte can soak electric core 3 downwards from the top of electric core 3 under the effect of gravity, the electrolyte that flows to casing 2 bottom also can upwards soak electric core 3 from the bottom of electric core 3 simultaneously, it can reduce the stationary time after annotating the liquid effectively to carry out the capillary action bidirectionally, thereby improve power battery's production efficiency, and it can also improve the infiltration effect of electric core 3 to carry out the capillary action bidirectionally, reduce the risk that the middle part of electric core 3 appears not soaking or not fully soaks effectively.

Specifically, the flow blocking net 12 includes a plurality of sub flow blocking nets 122, and the plurality of sub flow blocking nets 122 are sleeved layer by layer. The multi-layer sub-baffling net 122 can perform layered buffering on the electrolyte injected at a high speed, and can effectively reduce the speed of the electrolyte while ensuring that the injection of the electrolyte at the rear is not influenced.

In the present embodiment, referring to fig. 4 and 5, the flow blocking net 12 is formed by three sub flow blocking nets 122 which are sleeved layer by layer.

Preferably, the adjacent two layers of sub-current blocking nets 122 have gaps, and the gaps are smaller than 1 cm.

Further, each sub-baffling net 122 has a plurality of mesh openings 121, and the mesh openings 121 of each layer of sub-baffling net 122 are different in size. If the speed of the electrolyte is instantaneously reduced too much by the sub-baffle net 122 near the injection hole 111, the electrolyte to be injected later is likely to be blocked during injection. The sizes of the meshes 121 of the sub-current blocking nets 122 on each layer are different, so that the buffering and decelerating effects of the sub-current blocking nets 122 on the electrolyte on each layer are different, and the speed of the electrolyte is reduced layer by layer.

Preferably, the size of the mesh openings 121 of the sub-current blocking mesh 122 at the inner layer is larger than that of the mesh openings 121 of the sub-current blocking mesh 122 at the outer layer, that is, the size of the mesh openings 121 is gradually reduced from the sub-current blocking mesh 122 at the inner layer to the sub-current blocking mesh 122 at the outer layer, so that the speed of the electrolyte is gradually reduced layer by layer and the deceleration effect is gradually increased.

Furthermore, the flow blocking net 12 is made of an elastic polymer material, so that the buffering and decelerating effects on the electrolyte can be enhanced. Specifically, the flow blocking net 12 is made of rubber. In other embodiments, the flow blocking net 12 may also be made of other elastic polymer materials, and the material of the flow blocking net 12 is not specifically limited herein.

In this embodiment, referring to fig. 2 and 3, the top cap assembly 1 further includes a flow baffle 13, the flow baffle 13 includes a plate body and a plurality of connecting legs arranged at intervals to form a bowl-shaped structure having a plurality of second openings 141, the connecting legs are welded to one side of the cover plate 11 close to the inside of the housing 2, so that the flow baffle 13 is connected to the cover plate 11 to form an installation cavity 14, the plurality of connecting legs arranged at intervals are formed with a plurality of second openings 141, the flow baffle net 12 is arranged in the installation cavity 14, and the flow baffle 13 is communicated with the inside of the housing 2 of the battery through the second openings 141. The flow baffle 13 can block the electrolyte flowing out of the mesh 121 of the flow baffle net 12, further buffer and decelerate the electrolyte, and flow to the battery cells 3 in the casing 2 from the second opening 141, and can also play a role of supporting the flow baffle net 12.

In this embodiment, the flow blocking net 12 and the flow blocking plate 13 are connected by welding, so that the opening of the flow blocking net 12 faces the liquid injection hole 111, and the flow blocking net 12 does not deform under the impact of the high-speed injected electrolyte, thereby affecting the buffering and decelerating effect of the flow blocking net 12 on the electrolyte.

In another embodiment, the baffle net 12 is connected with the cover plate 11 by a snap fit. This design can be convenient for keep off the dismouting of flowing board 13, is convenient for change the maintenance.

In other embodiments, the flow blocking net 12 may be welded to the cover plate 11, or the flow blocking net 12 and the flow blocking plate 13 may be detachably connected. The connection of the flow blocking net 12 is not particularly limited.

Further, referring to FIG. 6, the lid assembly 1 further includes a sealing member 15, and the sealing member 15 is used to seal the pour hole 111. After the liquid injection is completed, the liquid injection hole 111 is sealed by the sealing member 15 to ensure the sealing property inside the case 2.

Specifically, referring to fig. 3 and 6, the liquid filling hole 111 is a stepped hole, the liquid filling hole 111 includes a first hole 1111 and a second hole 1112 which are communicated with each other, the first hole 1111 is communicated with the outside of the casing 2, the second hole 1112 is communicated with the inside of the casing 2, the sealing member 15 is a sealing nail, the sealing member 15 includes a first part 151 and a second part 152 which are connected, the first part 151 is in clearance fit with the first hole 1111, and the second part 152 is in interference fit with the second hole 1112 to seal the sealing member 15 and the liquid filling hole 111 in order to prevent the second part 152 from being excessively inserted into the liquid filling hole 111.

Preferably, the hardness of the sealing member 15 is greater than that of the cover plate 11 to facilitate interference fitting of the second portion 152 with the second hole 1112. The end of the second portion 152 distal from the first portion 151 is tapered to facilitate insertion of the second portion 152 into the second aperture 1112.

Specifically, the sealing member 15 is sealed with the side wall of the first hole 1111 of the liquid injection hole 111 by laser welding, so that the double protection effect on the liquid injection hole 111 is achieved, and liquid leakage of the power battery is avoided.

Referring to fig. 1, the embodiment further provides a power battery, which includes a casing 2, a battery core 3 disposed in the casing 2, and the above-mentioned top cap assembly 1, where the casing 2 is provided with a through hole, and the top cap assembly 1 blocks the through hole. According to the power battery of the embodiment, through the design of the top cover assembly 1, the condition that the middle part of the battery core 3 is not soaked or not fully soaked can be effectively reduced, so that the lithium precipitation of the power battery in the formation and grading charging processes is reduced, and the quality of the power battery is improved; and production efficiency is high, is difficult for causing the damage to electric core 3 when annotating the liquid.

In the description herein, it is to be understood that the terms "upper" and the like are used in a descriptive sense and based on the orientation or positional relationship shown in the drawings for convenience in description and simplicity of operation, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, configuration and operation in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description herein, references to the description of "an embodiment" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment.

Furthermore, it should be understood that although the specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it will be understood by those skilled in the art that the specification as a whole and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and is not to be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims

1. The utility model provides a top cap subassembly, top cap subassembly includes the apron, be provided with on the apron and annotate the liquid hole, its characterized in that, one side of being close to electric core of apron is provided with the baffling and flows the net, the net hole has been seted up on the baffling and flows the net have with annotate the first opening of liquid hole intercommunication.

2. The roof assembly of claim 1, wherein the flow blocking screen comprises a plurality of sub flow blocking screens, wherein the plurality of sub flow blocking screens are nested one within another.

3. The canopy assembly of claim 2, wherein each of the sub-flow barriers has a plurality of mesh openings, the mesh openings of each of the sub-flow barriers being different sizes.

4. The capping assembly of claim 3 wherein the mesh openings of the sub-networks in the inner layer are larger in size than the mesh openings of the sub-networks in the outer layer.

5. The header assembly of claim 3, wherein adjacent layers of the sub-networks have a gap, the gap being less than 1 cm.

6. The header assembly of claim 1, wherein the flow-blocking screen is formed of an elastomeric material.

7. The top cover assembly according to any one of claims 1 to 6, further comprising a flow baffle plate, wherein the flow baffle plate is connected to the cover plate to form an installation cavity, a plurality of second openings are spaced apart from each other on a wall of the installation cavity, the flow baffle net is installed in the installation cavity, and the flow baffle plate is communicated with the inside of the battery shell through the second openings.

8. The header assembly of claim 7, wherein the flow blocking screen is connected to the cover plate or the flow blocking plate by welding; and/or the presence of a gas in the gas,

9. The top cap assembly according to any one of claims 1 to 6, further comprising a sealing member, wherein the sealing member comprises a first portion and a second portion connected to each other, the liquid injection hole is a stepped hole, the liquid injection hole comprises a first hole and a second hole which are communicated with each other, the first hole is communicated with the outside of the battery case, the second hole is communicated with the inside of the battery case, the first portion is in clearance fit with the first hole, and the second portion is in interference fit with the second hole.

10. A power battery, comprising a casing and a battery cell arranged in the casing, wherein the casing is provided with a through hole, and further comprising the top cover assembly according to any one of claims 1 to 9, and the top cover assembly blocks the through hole.