CN214313367U

CN214313367U - Electrochemical device and power utilization device using same

Info

Publication number: CN214313367U
Application number: CN202120502966.0U
Authority: CN
Inventors: 刘胜浩; 王桂福; 唐富忠; ***
Original assignee: Dongguan Poweramp Technology Ltd
Current assignee: Dongguan Poweramp Technology Ltd
Priority date: 2021-03-09
Filing date: 2021-03-09
Publication date: 2021-09-28
Anticipated expiration: 2031-03-09

Abstract

The present application provides an electrochemical device and an electric device using the same. The electrochemical device includes: the battery cell support assembly comprises a plurality of battery cell supports stacked along a first direction, and each battery cell support comprises a partition plate and an accommodating cavity arranged on one side of the partition plate; the battery cell units are arranged in the accommodating cavity and are in contact connection with the partition board; the end plates are arranged at two ends of the battery cell bracket assembly along the first direction; the first buffer piece is arranged between the end plates and the battery cell units and is in contact connection with the end plates.

Description

Electrochemical device and power utilization device using same

Technical Field

The present disclosure relates to the field of battery technologies, and in particular, to an electrochemical device and an electric device using the same.

Background

The fixing of the battery core and the comprehensive stress structure design of the packaging film (such as the aluminum plastic film) can be used for ensuring the structural integrity of the battery core assembly and simultaneously reducing the stress of the packaging film (such as the aluminum plastic film), thereby preventing the damage of the packaging film (such as the aluminum plastic film). The structure of the battery packaging film (such as an aluminum plastic film) is easy to reach the yield and damage limits of materials when the battery packaging film is subjected to mechanical action such as vibration, dropping and the like. The fixed and comprehensive atress structural design of packaging film (for example aluminium-plastic film) of electric core needs be when guaranteeing installation wholeness such as electric core, support, end plate, BMS board, the atress of soft packet of electric core packaging film (for example aluminium-plastic film) as far as possible reduces.

The prior technical scheme mainly comprises two schemes, wherein the first scheme is to wholly or locally glue the electric core component; the second solution is to bond the electric core components into a whole through rigid connection. The main defects of the first scheme include complex process, difficult control of glue filling appearance, high quality, high cost and difficult disassembly of the electric core assembly; the second scheme adopts a rigid connection structure, and vibration and impact acting force is directly transmitted to a packaging film (such as an aluminum-plastic film), so that the packaging film (such as the aluminum-plastic film) is stressed greatly and cannot meet the mechanical performance requirement.

How to solve the above problems needs to be considered by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art. The present application provides an electrochemical device comprising: the battery cell support assembly comprises a plurality of battery cell supports stacked along a first direction, and each battery cell support comprises a partition plate and an accommodating cavity arranged on one side of the partition plate; the battery cell units are arranged in the accommodating cavity and are in contact connection with the partition board; the end plates are arranged at two ends of the battery cell bracket assembly along the first direction; and the first buffer piece is arranged between the end plates and the battery cell units, and the first buffer piece is in contact connection with the end plates. The first buffer piece and the end plate are not bonded, so that direct force transmission between the end plate and the battery cell is reduced; the battery cell and the battery cell support are fixed through interference fit, but are not bonded to fix the battery cell, so that the direct force action of the battery cell support on the battery cell is reduced, and the impact influence is reduced.

In one possible embodiment, the cell unit includes a cell and an insulating layer adhered to a surface of the cell, and the insulating layer is in contact connection with the separator. The battery cell is not bonded with the battery cell support, and the insulating layer is not bonded with the battery cell support, so that the direct force transmission from the battery cell support component to the battery cell unit is reduced, and the battery cell unit is protected. The insulating layer is arranged between the battery cell and the partition board so as to reduce the friction force generated by the direct contact between the battery cell and the partition board and further protect the battery cell unit.

In a possible implementation manner, the battery further comprises a second buffer member arranged between two adjacent battery cells, the two adjacent battery cells are respectively accommodated in the two adjacent battery cell supports, and the second buffer member is connected with the battery cells in a bonding manner. The second buffer member is arranged between the two battery cell units, so that the buffer space between the adjacent battery cell units can be increased, and the impact transmitted to the inside of the electrochemical device can be effectively absorbed to protect the electrochemical device.

In one possible embodiment, the second buffer is compressed by two battery cells, and the initial compression amount of the second buffer ranges from 0.5% to 1.5%. Wherein, through the compressive capacity of adjustment second bolster, can regulate and control the frictional quantity between electric core unit and the electric core bracket component.

In a possible embodiment, the battery cell includes a battery cell casing, an electrode assembly, and a tab, and along the second direction, the battery cell casing includes a receiving portion and a sealing portion that are sequentially disposed, the electrode assembly is disposed in the receiving portion, the tab extends out of the sealing portion from the battery cell casing, and the sealing portion and the receiving portion form a groove.

In a possible implementation manner, the accommodating cavity extends along a second direction and a third direction, the second direction and the third direction are perpendicular to the first direction, and the cell casing is fixed to the cell support in the first direction and the second direction through interference fit. Wherein, make electric core and electric core support realize fixed but not the adhesion in order to fix electric core through interference fit, reduce the direct effort of electric core support to electric core and reduce the impact influence.

In a possible implementation manner, the battery cell support further comprises a blocking strip, the blocking strip comprises an elastic material, and the blocking strip is arranged in the groove and is in contact with the partition board and the end portion of the battery cell support. Wherein, the holding intracavity is located to the shelves strip is used for assisting the fixed electric core of electric core support, and the elasticity fillet on the shelves strip can with the recess phase-match on the electric core, but effective control size and assembly when reducing the impact.

In a possible implementation manner, the buffer structure further comprises a third buffer member, the third buffer member is disposed in the accommodating cavity, the third buffer member and the barrier strip are disposed on two opposite sides of the sealing portion, and the third buffer member is disposed on one side of the sealing portion away from the partition plate. When two adjacent electric cores are stacked by buckling of the two adjacent electric core supports, the two adjacent third buffer parts are contacted and the mutual impact between the two adjacent electric core supports is reduced.

In a possible embodiment, the tab extends out of the cell support along the second direction, and the tab is bent towards the first direction and then welded to an adapter plate. The bent tab can play a role in buffering in impact and pulling, and impact and pulling force on the battery cell are reduced.

The application also provides an electric device, which comprises a body and an electrochemical device arranged in the body, wherein the electrochemical device provides electric energy for the electric device, and the electrochemical device is the electrochemical device.

Compare in prior art, the electrochemical device of this application promotes ability such as shock resistance (vibration, fall, striking) of electricity core through optimizing the inside installation of electrochemical device and connection structure. The first buffer piece and the end plate are not bonded, so that direct force transmission between the end plate and the battery cell is reduced; bonding the second buffer piece with the battery cell, and improving the structural integrity; the battery cell and the battery cell bracket are fixed in an interference fit manner without being bonded so as to fix the battery cell, so that the direct force effect of the battery cell bracket on the battery cell is reduced, and the impact influence is reduced; the baffle strip is arranged in the accommodating cavity and used for assisting the cell support to fix the cell, and an elastic fillet on the baffle strip can be matched with a groove on the cell, so that the size and assembly can be effectively controlled while the impact is reduced; by controlling the compression amount of the second buffer piece, the pressure and the friction force borne by the battery cell in the electrochemical device can be in a reasonable range.

Drawings

Fig. 1 is a schematic perspective exploded view of an electrochemical device according to an embodiment of the present application.

Fig. 2 is a schematic side view of an electrochemical device according to an embodiment of the present application.

Fig. 3 is a schematic view of a cell unit of an electrochemical device according to an embodiment of the present application.

FIG. 4 is a schematic view of an electrode assembly of an electrochemical device according to an embodiment of the present application

Fig. 5 is a partial cross-sectional view schematically illustrating an electrochemical device according to an embodiment of the present application.

Fig. 6 is an enlarged partial cross-sectional view schematically illustrating an electrochemical device according to an embodiment of the present application.

Fig. 7 is a schematic perspective view of an electric device according to an embodiment of the present application.

Description of the main elements

Electrochemical device 10

Battery cell bracket assembly 11

Battery cell support 110

Partition 111

Accommodating cavity 112

Coaming 113

Fixing member 115

Cell unit 12

Battery cell 121

Insulating layer 122

Cell shell 123

Electrode assembly 124

Tab 125

Accommodating part 126

Sealing part 127

Groove 128

End plate 13

First cushioning member 14

Second cushioning member 15

Third cushioning member 16

Stop strip 17

Adapter plate 18

Securing strap 19

First direction X

Second direction Z

Third direction Y

Power utilization device 1

Body 101

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

The following description will refer to the accompanying drawings to more fully describe the present disclosure. There is shown in the drawings exemplary embodiments of the present application. This application may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided so that this disclosure will be thorough and will fully convey the scope of the disclosure to those skilled in the art. Like reference numerals designate identical or similar components.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Further, as used herein, "comprises" and/or "comprising" and/or "having," integers, steps, operations, components, and/or components, but does not preclude the presence or addition of one or more other features, regions, integers, steps, operations, components, and/or groups thereof.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Furthermore, unless otherwise defined herein, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present application and will not be interpreted in an idealized or overly formal sense.

The following description of exemplary embodiments refers to the accompanying drawings. It should be noted that the components depicted in the referenced drawings are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar terms.

Embodiments of the present application will now be described in further detail with reference to the accompanying drawings.

Fig. 1 is a schematic perspective exploded view of an electrochemical device 10 according to an embodiment of the present disclosure, and fig. 2 is a schematic side view of the electrochemical device 10 according to an embodiment of the present disclosure, which provides an electrochemical device 10 according to an embodiment of the present disclosure.

The electrochemical device 10 includes a cell holder assembly 11, a plurality of cell units 12, an end plate 13, and a first buffer 14. The cell support assembly 11 includes a plurality of cell supports 110 stacked along a first direction X. Each cell support 110 includes a partition 111 and an accommodating cavity 112 disposed on one side of the partition 111. The cell unit 12 is disposed in the accommodating cavity 112, and the cell unit 12 is in contact with the partition 111. The end plates 13 are arranged at two ends of the cell bracket assembly 11 along the first direction X; the first buffer 14 is disposed between the end plate 13 and the cell unit 12, and the first buffer 14 is in contact with the end plate 13.

The first buffer 14 is disposed between the end plate 13 and the cell unit 12, and the first buffer 14 is made of an elastic material, such as foam, and is configured to absorb at least a part of an impact force directly impacting the cell holder assembly 11 or the cell unit 12 from the end plate 13. The first buffer 14 is in contact with the end plate 13 but is not bonded to reduce direct force transmission from the end plate 13 to the cell holder assembly 11 or the cell unit 12, so as to protect the cell unit 12.

In an embodiment, the cell support assembly 11 may include a plurality of cell supports 110, the cell support 110 further includes a surrounding plate 113, the surrounding plate 113 surrounds a cavity, the partition plate 111 is disposed in the cavity surrounded by the surrounding plate 113, the partition plate 111 contacts with the surrounding plate 113 to form two accommodating cavities 112, the two accommodating cavities 112 are disposed on two opposite sides of the partition plate 111, and one cell unit 12 is disposed in each of the two accommodating cavities 112 of one cell support 110.

In an embodiment, the battery cell support 110 is configured to fix and protect the battery cell unit 12, the battery cell unit 12 is disposed in the accommodating cavity 112 and fixed by the battery cell support 110, and the battery cell support 110 may be made of hard plastic.

The electrochemical device 10 further includes a second buffer 15, where the second buffer 15 is disposed between two adjacent battery cells 12, the adjacent battery cells 12 are respectively accommodated in the two adjacent battery cell supports 110, and the second buffer 15 is adhesively connected to the battery cells 12. In an embodiment, the second buffer 15 is squeezed by the two battery cell units 12, and the initial compression amount of the second buffer 15 ranges from 0.5% to 1.5%. Locate the second bolster 15 and can increase the buffering space between the adjacent electric core unit 12 between two electric core units 12 for the impact of transmitting to the inside of electrochemical device 10 can be effectively absorbed in order to protect electrochemical device, and, through the compressive capacity of adjustment second bolster 15, can regulate and control the frictional capacity between electric core unit 12 and electric core bracket assembly 11.

As shown in fig. 3 and 4, a schematic view of the cell unit 12 of the electrochemical device 10 of the present application is shown. The cell unit 12 includes a cell 121 and an insulating layer 122 adhered to a surface of the cell 121, and the insulating layer 122 is in contact connection with the separator 111. In one embodiment, the insulating layer 122 may further be attached to the surface of the cell 121 adjacent to the separator 111. The battery cell 121 is not bonded to the battery cell support 110, and the insulating layer 122 is not bonded to the battery cell support 110, so as to reduce the direct force transmission from the battery cell support assembly 11 to the battery cell unit 12, and protect the battery cell unit 12. The insulating layer 122 is disposed between the battery cell 121 and the separator 111 to reduce friction generated by direct contact between the battery cell 121 and the separator 111, and further protect the battery cell unit 12.

In an embodiment, the battery cell 121 includes a battery cell casing 123, an electrode assembly 124, and a tab 125, and along the second direction Z, the battery cell casing 123 includes a receiving portion 126 and a sealing portion 127 that are sequentially disposed, the electrode assembly 124 is disposed in the receiving portion 126, the tab 125 extends from the sealing portion 127 to the battery cell casing 123, and the sealing portion 127 and the receiving portion 126 form a groove 128.

As shown in fig. 1, the accommodating cavity 112 extends along a second direction Z and a third direction Y, the second direction Z is perpendicular to the third direction Y and the first direction Z, and the cell casing 123 is fixed to the cell holder 110 in the second direction Z and the third direction Y by interference fit.

Fig. 5 is a partial cross-sectional view of the electrochemical device 10 of the present application. In an embodiment, the electrochemical device 10 further includes a blocking strip 17, the blocking strip 17 includes an elastic material, the blocking strip 17 is disposed in the accommodating cavity 112 and contacts the partition 111, the blocking strip 17 is disposed at an end of the cell support 110 along the second direction Z, and the blocking strip 17 includes a rounded corner.

The joints of the barrier strips 17, the accommodating portions 126 and the sealing portions 127 are adapted to connect the battery cells 121. In this embodiment, shelves strip 17 locates at least one end in holding chamber 112 along second direction Z, and shelves strip 17 card is located between bounding wall 113 and baffle 111 to make the fillet towards electric core 121, when electric core 121 and electric core support 110 are fixed, elastic fillet is favorable to interference fit between electric core support 110 and electric core 121, and interference fit reduces the direct power impact of electric core support 110 to electric core 121.

In an embodiment, the electrochemical device 10 further includes a third buffer 16, the third buffer 16 is made of an elastic material, the third buffer 16 is disposed in the accommodating cavity 112, the third buffer 16 and the barrier strip 17 are disposed on two opposite sides of the sealing portion 127, and the third buffer 16 is disposed on a side of the sealing portion 127 away from the partition 111. When two adjacent battery cell supports 110 are buckled to stack two adjacent battery cells 121 in this embodiment, two adjacent third buffers 16 contact and slow down the mutual impact between the adjacent battery cell supports 110.

In an embodiment, the tab 125 extends out of the cell support 110 along the second direction Z, the tab 125 is bent towards the second direction Z and then welded to an adapter plate 18, and the bent tab 125 can play a role in buffering during impact and pulling, so as to reduce the impact and pulling force on the cell 121. In this embodiment, the tab 125 may be fixed by the third buffer 16 and the barrier strip 17, extend to the outside of the battery cell support 110, and be electrically connected to the adaptor plate 18, and the adaptor plate 18 may be a power management component.

As shown in fig. 1 and fig. 2, in an embodiment, the number of the end plates 13 may be two, and the two end plates 13 are disposed at two ends of the cell support assembly 11 along the first direction X and cover the cell units 12. Preferably, the plurality of cell supports 110 of the cell support assembly 11 are sequentially stacked along a first direction X, and projections of the plurality of cell supports 110 in the first direction X are overlapped, so that the surrounding plates 113 of the plurality of cell supports 110 are connected to form a protection structure, and meanwhile, the two end plates 13 are arranged at two ends of the cell support assembly 11 along the first direction X to seal and protect the two ends of the cell support assembly 11; the end plate 13 at least covers the accommodating cavities 112 at two ends of the cell holder assembly 11, and can extend along the first direction X to be connected with the cell assembly 11.

In an embodiment, the fixing members 115 are further disposed on the periphery of the cell support 110, the fixing members 115 may be disposed on the periphery of the surrounding plate 113, and after the cell support assemblies 11 are stacked and combined, the fixing members 115 may be arranged in the same straight line. The electrochemical device 10 further includes a fixing band 19, and the fixing band 19 is made of a rigid material and is configured to surround the cell holder assembly 11, the cell unit 12, and the end plate 13 after stacking, and is fixed to the fixing member 115.

As shown in fig. 7, an electric device 1 provided in the embodiment of the present application includes a body 101 and an electrochemical device 10 disposed inside the body 101, wherein the electrochemical device 10 provides electric energy for the electric device 1. In this embodiment, the electric device 1 is exemplified by a two-wheeled electric vehicle, and in other embodiments, the electric device 1 may be other electric devices such as an electric energy storage device, an electric motorcycle, an electric automobile, and the like.

Hereinbefore, specific embodiments of the present application are described with reference to the drawings. However, those skilled in the art will appreciate that various modifications and substitutions can be made to the specific embodiments of the present application without departing from the spirit and scope of the application. Such modifications and substitutions are intended to be within the scope of the present application.

Claims

1. An electrochemical device, comprising:

the battery cell support assembly comprises a plurality of battery cell supports stacked along a first direction, and each battery cell support comprises a partition plate and an accommodating cavity arranged on one side of the partition plate;

the battery cell units are arranged in the accommodating cavity and are in contact connection with the partition board;

the end plates are arranged at two ends of the battery cell bracket assembly along the first direction; and

the first buffer piece is arranged between the end plates and the battery cell units and is in contact connection with the end plates.

2. The electrochemical device of claim 1, wherein the cell unit comprises a cell and an insulating layer adhered to a surface of the cell, and the insulating layer is in contact connection with the separator.

3. The electrochemical device according to claim 2, further comprising a second buffer member disposed between two adjacent battery cells, wherein two adjacent battery cells are respectively accommodated in two adjacent battery cell supports, and the second buffer member is adhesively connected to the battery cells.

4. The electrochemical device according to claim 3, wherein the second buffer member is compressed by two of the battery cells, and an initial compression amount of the second buffer member ranges from 0.5% to 1.5%.

5. The electrochemical device according to claim 2, wherein the battery cell includes a battery cell casing, an electrode assembly, and a tab, and in the second direction, the battery cell casing includes a receiving portion and a sealing portion, the electrode assembly is disposed in the receiving portion, the tab extends out of the battery cell casing from the sealing portion, and the sealing portion and the receiving portion form a groove.

6. The electrochemical device according to claim 5, wherein the accommodating cavity extends along a second direction and a third direction, the second direction and the third direction are perpendicular to the first direction, and the cell casing is fixed to the cell support through interference fit in the second direction and the third direction.

7. The electrochemical device of claim 6, further comprising a barrier strip comprising an elastic material, wherein the barrier strip is disposed in the groove and contacts the separator and the end of the cell holder.

8. The electrochemical device according to claim 7, further comprising a third buffer member disposed in the receiving cavity, wherein the third buffer member and the barrier strip are disposed on opposite sides of the sealing portion, and the third buffer member is disposed on a side of the sealing portion away from the separator.

9. The electrochemical device of claim 5, wherein said tabs extend out of said cell support in said second direction, and said tabs are bent in said first direction and then welded to an adapter plate.

10. An electrical device comprising a body and an electrochemical device disposed within the body, the electrochemical device providing electrical energy to the electrical device, the electrochemical device being as claimed in any one of claims 1 to 9.