CN220042181U

CN220042181U - Battery cell

Info

Publication number: CN220042181U
Application number: CN202321348177.1U
Authority: CN
Inventors: 王勇; 程世平; 邹武俊; 韦丽娟
Original assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Current assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Priority date: 2023-05-30
Filing date: 2023-05-30
Publication date: 2023-11-17
Anticipated expiration: 2033-05-30

Abstract

The utility model relates to a battery comprising a housing, an electrode assembly housed within the housing, and at least one wicking element; the electrode assembly comprises at least one cell group, wherein the cell group comprises two cell monomers which are sequentially arranged; when the electrode assembly comprises two or more than two battery cell groups, the battery cell groups are sequentially arranged, and the arrangement direction of the battery cell groups is consistent with the arrangement direction of the battery cell monomers; the liquid absorbing element is arranged between two adjacent electric core monomers, and each electric core monomer is abutted against the liquid absorbing element along at least one side surface of the arrangement direction; one end of the liquid absorbing element is abutted against the bottom of the shell; according to the utility model, the liquid absorbing element is arranged by utilizing capillary action to absorb electrolyte and squeeze out and soak the electrolyte to the large surface of the battery cell, so that the utilization rate of the electrolyte and the liquid retention amount of the surface of the battery cell are improved, the cycle of the battery is improved, the service life of the battery is prolonged, and the safety is enhanced.

Description

Battery cell

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery.

Background

Along with research and development of new energy technology and popularization of new energy automobiles, the market puts forward higher requirements on the cruising ability and energy density of the power battery, and the capacity performance of the power battery is related to the power battery, so that the power battery also becomes a hot spot for research and development in related fields; the electrolyte retention amount in the battery winding core is one of the main factors influencing the capacity performance of the power battery.

Electrolyte is used as a medium for ion transmission in the battery circulation process, and the battery winding core needs to be fully soaked before charging and discharging; the electrolyte in the current battery is generally injected through the liquid injection port of the battery top cover after the battery winding core is put into the battery shell, the liquid injection method is easy to cause uneven surface infiltration of the battery core, less electrolyte infiltrates into the top of the battery core, and besides, the electrolyte is deposited at the bottom in a large amount due to the action of gravity and is easy to volatilize under a high-temperature environment to generate gas so as to increase the internal pressure of the battery, thus leading to the failure of the battery core. Therefore, a battery structure is lacking so that the electrolyte can uniformly infiltrate the battery cells and the liquid retention amount of the surfaces of the battery cells is improved.

Disclosure of Invention

Therefore, the technical problem to be solved by the utility model is to overcome the technical difficulty that electrolyte is deposited at the bottom of the battery shell to cause uneven electrolyte infiltration on the surface of the battery core in the prior art, and provide the battery, wherein the liquid suction element is arranged to suck the electrolyte from the bottom of the shell through capillary action for infiltrating the surface of the battery core single body.

In order to solve the above technical problems, the present utility model provides a battery, which includes,

a housing;

an electrode assembly; the electrode assembly is accommodated in the shell and comprises at least one cell group, and the cell group comprises two cell monomers which are sequentially arranged; when the electrode assembly comprises two or more than two battery cell groups, the battery cell groups are sequentially arranged, and the arrangement direction of the battery cell groups is consistent with the arrangement direction of the battery cell monomers;

the liquid absorbing element is arranged between two adjacent electric core monomers, and each electric core monomer is abutted against the liquid absorbing element along at least one side surface of the arrangement direction; one end of the liquid absorbing element is abutted against the bottom of the shell.

In one embodiment of the present utility model, the liquid absorbing element is disposed between two battery cells of each battery cell group.

In one embodiment of the present utility model, the liquid absorbing element is disposed between two adjacent cell groups.

In one embodiment of the present utility model, the liquid absorbing element is disposed between at least part of two adjacent cell groups, and the liquid absorbing element is disposed between two cell units of each cell group.

In one embodiment of the present utility model, the battery cell further comprises an insulating film layer, wherein the insulating film layer is at least arranged on the top surface and the bottom surface of the electrode assembly, and on two side surfaces of the electrode assembly along the arrangement direction of the battery cells.

In one embodiment of the present utility model, a first through groove is formed on the insulating film layer disposed on the bottom surface of the electrode assembly, and the first through groove is communicated with the bottom of the case.

In one embodiment of the utility model, the electrode assembly further comprises a support plate, wherein the support plate is arranged at the bottom of the shell, the top surface of the support plate is abutted against the insulating film layer arranged at the bottom surface of the electrode assembly, a second through groove is formed in the support plate and communicated with the bottom of the shell, and the first through groove is communicated with the second through groove; the liquid absorbing element passes through the first through groove and the second through groove and abuts against the bottom of the shell.

In one embodiment of the present utility model, a first insulating member is provided between the top cover of the case and the top surface of the electrode assembly; the liquid absorbing element is abutted against the first insulating piece.

In one embodiment of the present utility model, the thickness of the liquid absorbing element along the arrangement direction of the battery cells is less than 5mm; the thickness of the liquid absorbing element along the arrangement direction of the electric core monomers is smaller than that of the electric core monomers, and the thickness difference is larger than 2mm.

In one embodiment of the utility model, a second insulator is further included, the second insulator configured to annularly encase the electrode assembly and the wicking element.

Compared with the prior art, the technical scheme of the utility model has the following advantages:

according to the battery, the liquid absorbing element is arranged by utilizing capillary action to absorb electrolyte deposited at the bottom of the shell, and the electrolyte is extruded and infiltrated to the large surface of the battery cell, so that the utilization rate of the electrolyte and the infiltration degree of the electrolyte on the surface of the battery cell are improved, the loss of the electrolyte on the surface generated by circulation is timely supplemented, the liquid retention amount is improved, the circulation performance of the battery is improved, the high-rate charge and discharge requirements are met, the service life is prolonged, and the safety is enhanced.

Drawings

In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, in which:

FIG. 1 is a schematic cross-sectional view and a partially enlarged schematic view of a battery according to a preferred embodiment of the present utility model;

fig. 2 is a schematic diagram of the structure of a cell and a wicking element in one embodiment of the utility model;

fig. 3 is a schematic diagram of the structure of a cell and a wicking element in another embodiment of the utility model;

fig. 4 is a side view of a cell and a wicking element in another embodiment of the utility model;

fig. 5 is a schematic diagram of the structure of a cell and a wicking element in another embodiment of the utility model;

fig. 6 is a schematic view of the structure of a cell unit, a wicking element, and a second insulating component in accordance with another embodiment of the utility model.

Description of the specification reference numerals: 1. a housing; 11. a first insulating member; 2. an electrode assembly; 3. a cell group; 4. a cell unit; 5. a liquid-absorbing member; 51. a plug-in part; 52. a liquid suction part; 6. an insulating film layer; 61. a first through groove; 7. a support plate; 71. a second through slot; 8. and a second insulating member.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the utility model and practice it.

Examples

Referring to fig. 1 to 6, the present utility model provides a battery including a case 1 and an electrode assembly 2 accommodated in the case 1; the electrode assembly 2 comprises at least one cell group 3, and the cell group 3 comprises two cell monomers 4 which are sequentially arranged; when the electrode assembly 2 includes two or more than two battery cell groups 3, the plurality of battery cell groups 3 are sequentially arranged, and the arrangement direction of the plurality of battery cell groups 3 is consistent with the arrangement direction of the battery cell units 4; the battery further comprises at least one liquid absorbing element 5, wherein the liquid absorbing element 5 is arranged between two adjacent electric core monomers 4, and each electric core monomer 4 is abutted against the liquid absorbing element 5 along at least one side surface of the arrangement direction; one end of the liquid absorbing element 5 abuts against the bottom of the shell 1, absorbs and diffuses electrolyte deposited at the bottom of the shell 1 to the whole liquid absorbing element 5 through capillary action, and then transmits the electrolyte to the surface of the abutted cell unit 4, so that uniform infiltration of the electrolyte on the surface of the cell unit 4 is realized, the discharge capacity and the cycle performance of the battery are improved, and the service life of the battery is prolonged.

Specifically, referring to fig. 2, in some embodiments, the electrode assembly 2 includes one of the cell groups 3, the cell group 3 includes two of the cell units 4, the top surface of the cell unit 4 is close to the top of the housing 1, the bottom surface of the cell unit 4 is close to and parallel to the bottom surface of the housing 1, the cell unit 4 further includes at least four circumferential surfaces disposed between the top surface and the bottom surface, and the four circumferential surfaces of the cell unit 4 include a set of cell unit facets disposed in parallel, and further includes a cell unit large surface disposed in parallel and connected to the cell unit facets; the liquid absorbing element 5 is arranged between the two electric core monomers 4 of the electrode assembly 2, two side surfaces of the liquid absorbing element 5 in the thickness direction are respectively abutted against two opposite electric core monomer large surfaces of the two electric core monomers 4, so that electrolyte in the liquid absorbing element 5 can fully contact with the electric core monomers 4, the abutting area is large, the wetting effect of the electrolyte on the surfaces of the electric core monomers 4 is improved, the electrolyte is supplemented for the electric core monomers 4 on two sides, and the cycle performance of a battery is improved.

Specifically, referring to fig. 3, in some embodiments, the electrode assembly 2 includes at least two battery cell groups 3, the battery cell groups 3 are sequentially arranged, each battery cell group 3 includes two battery cell units 4, and large faces of the battery cell units 4 are opposite to each other; the liquid absorbing element 5 is arranged between the two battery cell monomers 4 of each battery cell group 3; the electrolyte sucked into the liquid suction element 5 by capillary action is transferred to the surfaces of the cell monomers at the two sides of the liquid suction element through abutting contact; in this embodiment, the cell units 4 in each cell group 3 raise the electrolyte infiltration amount of the surface through the same liquid absorbing element 5; on one hand, each cell unit 4 in the electrode assembly 2 is arranged such that one side of the cell unit is in large-surface abutting contact with the liquid absorbing element 5, so that the overall cycle performance of the electrode assembly 2 is improved; on the other hand, only the liquid absorbing elements 5 are disposed in the electric core group 3, the number of the liquid absorbing elements 5 is controlled, the thickness increased by inserting the liquid absorbing elements 5 in the arrangement direction of the electric core group 3 can be reduced, the space utilization rate in the casing 1 is improved, and the energy density of the battery is improved.

Specifically, referring to fig. 4, in some embodiments, the electrode assembly 2 includes at least two cell groups 3, where the cell groups 3 are sequentially arranged; the large surface of each cell unit 4 in each cell group 3, which is close to the adjacent cell group 3, is opposite to the adjacent cell group 3; the liquid absorbing element 5 is arranged between two adjacent cell groups 3; in this embodiment, the cell units 4 in each cell group 3 respectively increase the infiltration amount of the surface electrolyte through different liquid absorbing elements 5 at two sides; the number of the liquid absorbing elements 5 can be reasonably set in the arrangement direction of the battery cell units 4 in the same manner as in the previous embodiment, so that the electrolyte infiltration of the battery cell units 4 is ensured, and the thickness of the electrode assembly 2 in the arrangement direction of the battery cell units 4 is controlled.

Specifically, referring to fig. 5, in some embodiments, the electrode assembly 2 includes at least two cell groups 3, where the cell groups 3 are sequentially arranged; the imbibition element 5 is arranged between at least part of two adjacent cell groups 3, and the imbibition element 5 is arranged between two cell monomers 4 of each cell group 3, so that the imbibition element 5 is abutted to the large surfaces of two sides of the cell monomers 4 to infiltrate electrolyte, the circulation performance inside the electrode assembly 2 is better, and the service life of a battery is prolonged. Further, when the liquid absorbing elements 5 are disposed between the adjacent cell groups 3 and between the two cell units 4 in each cell group 3, the liquid absorbing elements 5 are provided with electrolyte on the large surfaces of the two sides of the cell units 4 except for the cell units 4 at the two ends in the arrangement direction. The ion transmission path in the electrode assembly 2 is shorter, and the battery core monomers 4 all participate in electrochemical reaction, so that the rate capability and discharge capacity of the battery are improved.

Specifically, referring to fig. 1, the bottom of the casing 1 is provided with a rounded structure when the casing 1 is formed by stamping, and the inventor researches that, due to the rounded structure of the casing 1, the electrode assembly 2 cannot be tightly attached to the bottom wall and the side wall of the casing 1 when being accommodated in the casing 1, and the edges connecting the bottom surface and the circumferential side surface of the electrode assembly 2 contact the inside of the casing 1, and due to the small contact area, the battery cell 4 and the liquid absorbing element 5 cannot be stably clamped during production, transportation and use, and meanwhile, the electrode assembly 2 also can cause damage to the surface structure due to collision with the casing 1, so that the service life of the battery is directly affected. Accordingly, the battery is further provided with an insulating film layer 6 and a support plate 7; the insulating film layer 6 is at least arranged on the top surface and the bottom surface of the electrode assembly 2, and the electrode assembly 2 is arranged along the two side surfaces of the battery cell 4 in the arrangement direction, so as to cover and protect the surface of the electrode assembly 2, wherein a first through groove 61 is further formed in the insulating film layer 6 arranged on the bottom surface of the electrode assembly 2, the first through groove 61 is communicated with the bottom of the shell 1 so that one end of the liquid absorbing element 5 passes through, and the insulating film layer 6 is prevented from blocking and interfering the liquid absorbing element 5 to absorb electrolyte.

Further, the support plate 7 is disposed at the bottom of the housing 1, and is used for supporting the electrode assembly 2, so as to avoid collision of the rounded corner structure at the bottom of the housing 1; the top surface of the supporting plate 7 is abutted against the insulating film layer 6 arranged on the bottom surface of the electrode assembly 2; the support plate 7 is provided with a second through groove 71, the second through groove 71 is communicated with the bottom of the shell 1, and the first through groove 61 is communicated with the second through groove 71. The liquid absorbing element 5 comprises a plugging part 51 and a liquid absorbing part 52, and the end part of the plugging part 51 sequentially passes through the first through groove 61 and the second through groove 71 and is abutted against the bottom of the shell 1 to absorb electrolyte.

Further, the liquid absorbing element 5 may be made of elastic porous material; the inside of the liquid absorbing element is provided with a plurality of micro holes, when the liquid absorbing element contacts with the liquid level of the electrolyte at the bottom of the shell 1, the electrolyte can be absorbed through capillary action, and simultaneously the electrolyte is continuously diffused in the communicated holes through capillary action to infiltrate the liquid absorbing element 5. In order to make the liquid absorbing element 5 sufficiently absorb the electrolyte at the bottom of the casing 1, to increase the utilization rate of the electrolyte, one end of the liquid absorbing element 5 is inserted through the first through groove 61 and the second through groove 71 and is abutted against the bottom wall of the casing 1. The first through groove 61 and the second through groove 71 can not only provide avoidance space for the liquid absorbing element 5 to pass through, but also fix the liquid absorbing element 5 to reduce displacement. During the cycle of the battery, the surface of the battery cell 4 expands and presses the liquid absorbing element 5 contacted with the battery cell, and electrolyte in the pores of the liquid absorbing element 5 is extruded and soaked in the battery cell 4 after the liquid absorbing element 5 is extruded. The thickness of the liquid absorbing element 5 along the arrangement direction of the battery cell monomers 4 is smaller than 5mm; the thickness of the liquid absorbing element 5 along the arrangement direction of the battery cell 4 is smaller than the thickness of the battery cell 4, the thickness difference is larger than 2mm, the phenomenon that the excessive thickness of the liquid absorbing element 5 in the arrangement direction influences the group margin of the electrode assembly 2 in the shell and the battery is avoided, and the performance and the safety of the battery are ensured.

Specifically, referring to fig. 1, a first insulating member 11 is provided between the top cover of the case 1 and the top surface of the electrode assembly 2; the first insulating member 11 can avoid the electrode assembly 2 from touching the top cover to short-circuit, and simultaneously fixedly clamp one end of the liquid suction part 52 away from the first through groove 61, and the liquid suction element 5 is abutted against the first insulating member 11; the first insulating member 11, the first through groove 61, the second through groove 71 and the bottom wall of the housing 1 are together at two ends of the extending direction of the liquid absorbing element 5 to stably clamp the liquid absorbing element 5, so as to further fix the liquid absorbing element 5, and avoid the liquid absorbing element 5 from shaking up and down to affect the liquid absorption and the electrolyte release in the use process of the battery.

Specifically, referring to fig. 6, the battery further includes a second insulating member 8, where the second insulating member 8 is configured to be annular and wrap around the electrode assembly 2 and the liquid absorbing element 5, fix the second insulating member around the outer periphery, strengthen the abutting relationship between the electrode assembly 2 and the liquid absorbing element 5, ensure close contact and firm contact, and enable the surface of the liquid absorbing element 5 to be deformed by applying force when the cell 4 expands, and smoothly extrude the electrolyte. In some embodiments, the second insulator 8 is provided as an insulating tape tied to the outer circumference; in other embodiments, the second insulating member 8 may be provided with other insulating structures for fixing the wrap, not limited thereto.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present utility model will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims

1. A battery, characterized by comprising,

a housing (1);

an electrode assembly (2); the electrode assembly (2) is accommodated in the shell (1), the electrode assembly (2) comprises at least one cell group (3), and the cell group (3) comprises two cell monomers (4) which are sequentially arranged; when the electrode assembly (2) comprises two or more than two battery cell groups (3), the battery cell groups (3) are sequentially arranged, and the arrangement direction of the battery cell groups (3) is consistent with the arrangement direction of the battery cell monomers (4);

the liquid absorbing element (5) is arranged between two adjacent electric core monomers (4), and each electric core monomer (4) is abutted against the liquid absorbing element (5) along at least one side surface of the arrangement direction; one end of the liquid absorbing element (5) is abutted against the bottom of the shell (1).

2. The battery according to claim 1, wherein: the liquid absorbing elements (5) are arranged between the two battery core monomers (4) of each battery core group (3).

3. The battery according to claim 1, wherein: the liquid absorbing elements (5) are arranged between two adjacent cell groups (3).

4. The battery according to claim 1, wherein: the liquid absorbing element (5) is arranged between at least part of two adjacent cell groups (3), and the liquid absorbing element (5) is arranged between two cell monomers (4) of each cell group (3).

5. The battery according to any one of claims 1 to 4, wherein: the battery cell structure further comprises an insulating film layer (6), wherein the insulating film layer (6) is at least arranged on the top surface and the bottom surface of the electrode assembly (2), and the electrode assembly (2) is arranged along the two side surfaces of the battery cell unit (4) in the arrangement direction.

6. The battery according to claim 5, wherein: the insulating film layer (6) arranged on the bottom surface of the electrode assembly (2) is provided with a first through groove (61), and the first through groove (61) is communicated with the bottom of the shell (1).

7. The battery according to claim 6, wherein: the electrode assembly comprises a shell (1), and is characterized by further comprising a supporting plate (7), wherein the supporting plate (7) is arranged at the bottom of the shell (1), the top surface of the supporting plate (7) is abutted against the insulating film layer (6) arranged on the bottom surface of the electrode assembly (2), a second through groove (71) is formed in the supporting plate (7), the second through groove (71) is communicated with the bottom of the shell (1), and the first through groove (61) is communicated with the second through groove (71); the liquid absorbing element (5) passes through the first through groove (61) and the second through groove (71) and abuts against the bottom of the shell (1).

8. The battery according to claim 1, wherein: a first insulating piece (11) is arranged between the top cover of the shell (1) and the top surface of the electrode assembly (2); the liquid absorbing element (5) is abutted against the first insulating member (11).

9. The battery according to claim 1, wherein: the thickness of the liquid absorbing element (5) along the arrangement direction of the battery cell monomers (4) is smaller than 5mm; the thickness of the liquid absorbing element (5) along the arrangement direction of the electric core monomers (4) is smaller than the thickness of the electric core monomers (4), and the thickness difference is larger than 2mm.

10. The battery according to claim 1, wherein: also included is a second insulator (8), the second insulator (8) being configured to annularly encase the electrode assembly (2) and the wicking element (5).