CN214957119U

CN214957119U - Soft-packaged battery cell unit

Info

Publication number: CN214957119U
Application number: CN202121520547.6U
Authority: CN
Inventors: 陈建国; 王颖; 彭月猛; 陈保国
Original assignee: Tianjin EV Energies Co Ltd
Current assignee: Tianjin EV Energies Co Ltd
Priority date: 2021-07-05
Filing date: 2021-07-05
Publication date: 2021-11-30
Anticipated expiration: 2031-07-05

Abstract

The utility model provides a soft-packaged electrical core unit, first output row's subassembly including U shell and inside setting, second output row's subassembly, the spacer, electric core, the sampling subassembly, No. two end covers, No. four end covers and glue, be equipped with the spacer between two adjacent electric cores, the anodal ear of electric core forms electric core stack group after piling up with anodal ear homonymy, electric core stack group's one end and first output row's subassembly rigid coupling, the other end and second output row's subassembly rigid coupling, first output row's subassembly is pegged graft with No. two end covers, second output row's subassembly is pegged graft with No. four end covers, every electric core bottom is through sampling subassembly signal connection to external BMS, be equipped with glue between electric core and the U shell. Soft-packaged electrical core unit, electric core can be at thickness, length is square expands to can promote energy density and effective control thermal runaway.

Description

Soft-packaged battery cell unit

Technical Field

The utility model belongs to the technical field of the battery, especially, relate to a soft-packaged electrical core unit.

Background

In recent years, new energy automobiles enter a vigorous development era, the sales volume is gradually increased, the competition with the traditional fuel oil automobiles is more and more intense, the requirements on the cost of the new energy automobiles are lower and higher, the endurance requirement is higher and higher, the lightweight level of the whole automobile is required to be continuously improved, the battery system occupies about 30 percent of the weight of the whole automobile, and the cost accounts for more than 20 percent. The battery system and the whole vehicle are mutually independent, the light weight level is relatively low, and the cost is higher. Soft-packaged electrical core module energy density is low, and thermal runaway is difficult for controlling, can only superpose and electric core does not have structural strength in that thickness is square, and it is big that battery system receives module size to influence in groups.

Disclosure of Invention

In view of this, the utility model aims at providing a soft packet of electric core unit to solve the uncontrollable problem of soft packet of thermal diffusion.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model provides a soft-packaged electrical core unit, the first output row subassembly that includes U shell and inside setting, the second output row subassembly, the spacer, electric core, the sampling subassembly, No. two end covers, No. four end covers and glue, be equipped with the spacer between two adjacent electric cores, the anodal ear of electric core forms electric core stack group after piling up with anodal ear homonymy, the one end and the first output row subassembly rigid coupling of electric core stack group, the other end and second output row subassembly rigid coupling, first output row subassembly is pegged graft with No. two end covers, the second output row subassembly is pegged graft with No. four end covers, every electric core bottom is through sampling subassembly signal connection to external BMS, be equipped with glue between electric core and the U shell.

Further, the sampling assembly is a wire harness or an FPC.

Furthermore, the first output row component comprises a first output row and a first end cover, and the first output row and the first end cover are combined in any one or more of integral injection molding, buckling fixation or direct placement in limiting;

furthermore, the second output row assembly comprises a third end cover and a second output row, and the third end cover and the second output row are integrally molded or fixed by a buckle or directly placed in any one or more of limiting positions.

Furthermore, an insulating film is pasted inside the U-shaped shell, and an exhaust guide opening is formed in the upper portion of the U-shaped shell.

Further, the glue comprises a battery core heat conduction glue structure, a low heat conduction glue structure and a non-structure bonding glue which are arranged independently.

Compared with the prior art, soft-packaged electrical core unit have following advantage:

(1) soft-packaged electrical core unit, electric core can be at thickness, length is square expands to can promote energy density and effective control thermal runaway.

(2) Soft-packaged electrical core unit, improve the unable atress current situation of soft-packaged electrical core, increase soft-packaged electrical core mode flexibility ratio in groups, solve the uncontrollable problem of soft-packaged thermal diffusion.

(3) Soft-packaged electric core unit, the inside insulating film that posts of U type shell of setting, the exhaust water conservancy diversion mouth that upper portion set up, the unit equipment of being convenient for on the one hand, mainly be the directional air conservancy diversion effect that exhausts of electric core thermal diffusion.

(4) The soft-packaged cell unit of the utility model adopts a glue layered design, uses glue with low heat conductivity or glue which can be carbonized at high temperature on the large surface of the cell, and the structural bonding of the glue is increased according to the requirement; the unit heat exchange window is positioned on the upper part or the bottom surface of the battery, can be selected according to the external heat exchange mode, and is provided with an exhaust channel for heat diffusion.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is an exploded view of a cell unit according to an embodiment of the present invention;

fig. 2 is a schematic diagram of parallel stacking of battery cells according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a cell series connection according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a first output assembly according to an embodiment of the present invention;

fig. 5 is an assembly view of a first end cap and a second end cap according to an embodiment of the present invention;

fig. 6 is a schematic view of a U-shaped shell according to an embodiment of the present invention;

fig. 7 is a first layout diagram of the glue according to the embodiment of the present invention;

fig. 8 is a second layout of the glue according to the embodiment of the present invention.

Description of reference numerals:

1-second output row; 2-a spacer; 3-electric core; 4-second end cap; 5-output row I; 6-end cap number one; 7-U-shaped shell; 71-an insulating film; 72-an exhaust diversion port; 8-sampling assembly 9-number three end cap; 10-fourth end cap; 11-glue; 111-cell thermal conductive adhesive structure; 112-low thermal conductivity gel structure; 113-adhesive without structure.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The noun explains:

thermal runaway: the phenomenon that the current and the temperature are both increased and mutually promoted when the battery is charged/short-circuited/the internal pole piece is damaged and the like; this phenomenon can cause the battery to swell and even explode, catch fire, and produce a large amount of high temperature gas and liquid.

Soft package battery: the soft package battery is formed by covering a polymer shell on a liquid lithium ion battery. The structure adopts aluminum plastic film package.

And (3) pole lug: the battery is divided into positive and negative electrodes, the tabs are metal conductors leading out the positive and negative electrodes from the battery core, and the ears of the positive and negative electrodes of the battery are contact points during charging and discharging. This contact point is not the copper sheet that we see on the outside of the cell, but rather a connection inside the cell. The tabs are made of three materials, the positive electrode of the battery is made of aluminum (Al) material, the negative electrode of the battery is made of nickel (Ni) material, and the negative electrode of the battery is also made of copper nickel (Ni-Cu) material, and the tabs and the negative electrode are both formed by compounding a film and a metal belt.

FPC: a Flexible Printed Circuit (FPC) is a highly reliable and excellent Flexible Printed Circuit board made of polyimide or polyester film as a base material. The high-density light-weight LED lamp has the characteristics of high wiring density, light weight, thin thickness and good bending property.

The module: after the batteries are combined in series and parallel through the structural components, the battery pack has the function of externally exchanging electric energy, is provided with a protection circuit, and can externally output a combination of signals such as voltage, temperature and the like of the batteries.

As shown in fig. 1 to 8, each cell unit includes a U-shaped shell 7 and a first output row assembly arranged inside the U-shaped shell 7, a second output row assembly, a spacer 2, a cell 3, a sampling assembly 8, a second end cover 4, a fourth end cover 10 and glue 11, a spacer 2 is arranged between two adjacent cells 3, a positive tab of the cell 3 is stacked on the same side of the positive tab to form a cell stack assembly, one end of the cell stack assembly is fixedly connected with the first output row assembly, the other end of the cell stack assembly is fixedly connected with the second output row assembly, the first output row assembly is connected with the second end cover 4 in an inserting manner, the second output row assembly is connected with the fourth end cover 10 in an inserting manner, the bottom of each cell 3 is connected to the outside of the BMS through a signal of the sampling assembly 8, and glue 11 is arranged between the cell 3 and the U-shaped shell 7. This scheme has improved the unable atress current situation of soft-packaged electrical core, has increased the grouped mode flexibility ratio of soft-packaged electrical core, and it is uncontrollable to solve soft-packaged thermal diffusion. And the grouping is more flexible, and the standardization, the light weight and the integration are more facilitated.

The number of the battery cells 3 is increased according to the parallel requirement, and a plurality of battery cells 3 can be stacked.

In one or more embodiments, the number of stacking of electric core 3 is 2, and the anodal ear homonymy of two electric cores 3 are piled up, has pasted spacer 2 between electric core 3 and the electric core 3, and spacer 2 is for steeping cotton or aerogel, and steep cotton or aerogel are used for absorbing 3 expansions of electric core and thermal-insulated effect. In another embodiment, the number of the cells 3 is 3, one side of the stacked cell tabs is assembled with the first output row assembly, the other side of the stacked cell tabs is combined with the next stacked cell, the tabs and the tab parts are overlapped and stacked, the number of the tabs is increased according to the series requirement, and finally, the tabs on one side of one cell 3 in a string are combined with the second output row assembly and are fixedly combined by laser welding or ultrasonic welding after combination.

The first output row component comprises a first output row 5 and a first end cover 6, and the first output row 5 and the first end cover 6 are combined in any one or more of integral injection molding, buckling fixation or direct placement in limiting; the second output row assembly comprises a third end cover 9 and a second output row 1, and the combination mode of the third end cover 9 and the second output row 1 is any one or more of integral injection molding, buckling fixation or direct placement in limiting; the first output row 5 and the second output row 1 are both made of copper, aluminum or copper-aluminum composite materials and are used for exchanging electric energy between the unit bodies and the outside; the structure bilateral symmetry of end cover 6 and No. three end cover 9, the material is PP + 30% GF, all is equipped with limit structure, mounting structure, connector buckle structure and subtract heavy and technology structure on end cover 6 and No. three end cover 9.

The shape and the number of the end cover I6 can be determined according to actual conditions.

The purpose of No. two end covers 4 and No. four end covers 10 is for protecting first output row subassembly, second output row subassembly and the utmost point ear of electric core 3, supports first output row subassembly, second output row subassembly, and the nut is inlayed to inside, and it is fixed to be convenient for connect when electric core unit 3 outwards exports. No. two end covers 4 and No. four end covers 10 are equipped with spacing limit structure, installation buckle structure, connector buckle structure and subtract heavy structure, design a plurality of buckles, cooperate fixedly with end cover 6, No. three end covers 9 respectively.

The U-shaped shell 7 is made of steel, aluminum or other high-temperature-resistant materials, an insulating film 71 is pasted inside the U-shaped shell 7, and an exhaust guide port 72 is formed in the upper portion of the U-shaped shell 7, so that unit assembly is facilitated on one hand, and the heat diffusion, directional exhaust and guide effects of the battery core 3 are mainly achieved.

Different parts adopt different functional glues and are designed according to external conditions; the glue 11 comprises a cell heat-conducting glue structure 111, a low heat-conducting glue structure 112 and a non-structural bonding glue 113 which are arranged independently, and the low heat-conducting glue structure 112 can be replaced by a high-temperature carbonizable glue. The glue is designed in a layered mode, low-heat-conduction glue or high-temperature carbonizable glue is used on the large surface of the battery core 3, and structural bonding of the glue is increased according to requirements; the unit heat exchange window is positioned on the upper part or the bottom surface of the battery, bottom heat exchange is adopted according to the schemes of external heat exchange, such as selection, exemplification and the like, the bottom can adopt a cell heat-conducting adhesive structure adhesive 381 (epoxy resin AB adhesive), and an unstructured adhesive 113 (organic silica gel) is adopted when the unit heat exchange window is positioned on the upper part, so that an exhaust channel is reserved for heat diffusion.

In one embodiment, a cell thermal conductive adhesive structure 111 is arranged between the cell 3 and the bottom of the U-shaped shell 7, so that heat exchange between the bottom of the cell 3 and the outside is facilitated; a low-thermal-conductivity adhesive structure 112 or high-temperature carbonizable adhesive is arranged between the battery cell 3 and the side surface of the U-shaped shell 7, and the battery cell 3 is positioned at the opening of the U-shaped shell 7 and uses a non-structural adhesive 113. In another embodiment, a low thermal conductive adhesive structure 112 or a high-temperature carbonizable adhesive is disposed between the battery cell 3 and the bottom of the U-shaped shell 7 and between the sides of the U-shaped shell 7, and the battery cell 3 is located at the opening of the U-shaped shell 7 and uses the battery cell thermal conductive adhesive structure 111, so that heat exchange between the top of the battery cell 3 and the outside is facilitated.

The sampling assembly 8 is a wire harness or an FPC, the sampling assembly 8 is used for sampling voltage and temperature, a wire harness or FPC sampling terminal is designed by using a nickel sheet or an aluminum sheet and is connected by using laser welding or ultrasonic welding, and the number of voltage and temperature can be increased or decreased according to different requirements; pencil or FPC arrange in 3 bottoms of all electric cores (thickness side), use the double faced adhesive tape fixed, and pencil or FPC other end pass through the connector and are connected with external BMS, carry out the data interchange of sampling through the electric current, and the connector cooperates fixedly with an end cover or No. three end cover designs fast inserting structure.

This scheme has improved the unable atress current situation of soft-packaged electrical core, has increased the grouped mode flexibility ratio of soft-packaged electrical core, has solved the uncontrollable problem of soft-packaged thermal diffusion. Make soft-packaged electrical core in groups more nimble, more be favorable to standardization, lightweight, integration.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a soft-packaged electrical core unit which characterized in that: including the first output row subassembly of U shell and inside setting, the second output row subassembly, the spacer, electric core, the sampling subassembly, No. two end covers, No. four end covers and glue, be equipped with the spacer between two adjacent electric cores, the anodal ear of electric core forms electric core stack group with anodal ear homonymy after piling up, the one end and the first output row subassembly rigid coupling of electric core stack group, the other end and second output row subassembly rigid coupling, first output row subassembly is pegged graft with No. two end covers, second output row subassembly is pegged graft with No. four end covers, every electric core bottom is through sampling subassembly signal connection to external BMS, be equipped with glue between electric core and the U shell.

2. The soft-package cell unit according to claim 1, characterized in that: the sampling assembly is a wire harness or an FPC.

3. The soft-package cell unit according to claim 1, characterized in that: the first output row component comprises an output row and an end cover, and the combination mode of the output row and the end cover is any one or more of injection molding, buckle fixing or direct placing in limiting.

4. The soft-package cell unit according to claim 1, characterized in that: the second output row assembly comprises a third end cover and a second output row, and the third end cover and the second output row are integrally molded or fixed by a buckle or directly placed in any one or more combinations of limiting.

5. The soft-package cell unit according to claim 1, characterized in that: an insulating film is pasted in the U-shaped shell, and an exhaust guide opening is formed in the upper portion of the U-shaped shell.

6. The soft-package cell unit according to claim 1, characterized in that: the glue comprises a battery core heat-conducting glue structure, a low heat-conducting glue structure and a non-structural bonding glue which are arranged independently.