CN211858754U - Battery cell stacking structure - Google Patents

Abstract

The utility model relates to an electric core stacking structure, which comprises a plurality of electric cores, a plurality of double-faced adhesives and foam cotton; the two battery cores are stacked along the thickness direction and connected through the double-sided adhesive tape to form a battery core group, and the plurality of battery core groups are connected to form a battery core stacked body; and the foam is arranged between the adjacent battery cell groups and at two ends of the battery cell stacking body. The utility model discloses can solve electric core and pile up easy wearing and tearing in the operation process, it is inconvenient to change, and heat conductivility is poor, the potential safety hazard is serious scheduling problem.

Description

Battery cell stacking structure

Technical Field

The utility model belongs to the technical field of the battery module technique and specifically relates to a structure is piled up to electricity core.

Background

With the popularization of electric vehicles, the endurance mileage and thermal safety of power batteries become the focus of public attention. In the system, the mass of the module mainly accounts for more than 70% of the total mass of the system, and the energy density of the battery module needs to be increased to improve the endurance mileage of the battery. The energy density of the battery module is improved mainly by two ways, wherein one way is to improve the energy density of the single battery cell, but the energy density of the single battery cell at the present stage reaches a higher level and is difficult to improve in a short time; the other is to reduce the quality of the structural members in the module and improve the grouping rate, thereby reducing the quality of the module and improving the energy density of the module. At this stage, the second approach is to increase the energy density of the battery module. Meanwhile, along with the promotion of energy density, the heat that the battery produced in the charge-discharge process is more and more, and battery thermal management also becomes more and more important, how set up effectual heat conduction path in the module, derive the heat that produces in the electric core working process and become the hotspot of research.

The main standard modules in the field of conventional battery modules are 355 modules, 390 modules and 590 modules. The mode of uniting of these modules is similar, all arranges in proper order through electric core and becomes group, and through frame bearing structure at the in-process in groups, this kind of mode of uniting had both increased the structural component, has also blockked the heat dissipation of electric core simultaneously, is unfavorable for uniting of new generation high energy density standard module.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides an electricity core stacks structure for solve electricity core and stack easy wearing and tearing in the operation process of stacking, it is inconvenient to change, and heat conductivility is poor, the serious scheduling problem of potential safety hazard.

The utility model provides an electric core stacking structure, which comprises a plurality of electric cores, a plurality of double-faced adhesives and foam cotton; the two battery cores are stacked along the thickness direction and connected through the double-sided adhesive tape to form a battery core group, and the plurality of battery core groups are connected to form a battery core stacked body; and the foam is arranged between the adjacent battery cell groups and at two ends of the battery cell stacking body.

Furthermore, the first foam is arranged between the adjacent cell groups, and the second foam is arranged at two ends of the cell stacking body.

Further, two sides of the first foam are glued or coated with glue.

Further, the back glue or the glue is respectively arranged at the top of one side of the first foam and the bottom of the other side of the first foam.

Further, the single side of the second foam is back-glued or glued.

Further, the back glue or the glue is respectively arranged at the top and the bottom of one side of the second foam.

The battery cell stacking body is provided with a battery cell stacking body, and the battery cell stacking body is provided with a thermal runaway prevention structure.

The battery cell stacking body is fixed on the battery cell stacking body, and the heat conducting structure is used for fixing the battery cell stacking body and conducting heat exchange and is arranged at the bottom of the battery cell stacking body.

Further, the heat conduction structural part is heat conduction structural adhesive.

Compared with the prior art, the beneficial effects of the utility model are that:

1. two battery cores are bonded into a battery core group through double-sided adhesive tape, a plurality of battery core groups are connected into a battery core stacking body, and structural members such as a fixed frame and a heat dissipation aluminum plate of a former module are eliminated, so that structural supporting members in the battery core grouping process are reduced, and the grouping rate, the volume energy density and the mass energy density of the battery cores are greatly improved;

2. the battery cell can be directly contacted with the outer side structural member, so that the heat dissipation capacity of the battery cell is enhanced;

3. the foam cotton is arranged between the cell groups and at the two ends of the cell stacking body, so that the cell can be protected, the pretightening force can be provided for the cell in the cell life initial state, and the expansion space can be provided in the cell life cycle.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of a cell stacking structure according to an embodiment of the present invention;

fig. 2 is a schematic view of the combination of two cells and a double-sided adhesive tape in a cell group according to an embodiment of the present invention;

fig. 3 is a top view of a cell stacking structure according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of a surface a-a of a cell stacking structure according to an embodiment of the present invention.

Description of reference numerals:

10: an electric core; 20: double-sided adhesive tape; 30: first foam; 40: second foam; 50: preventing thermal runaway structures; 60: a thermally conductive structure.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element 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" and "first" 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be 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 in specific cases to those skilled in the art.

In order to better explain the present invention, the embodiments of the present invention are described in detail with reference to fig. 1 to 4.

As shown in fig. 1 and fig. 2, the present invention provides a cell stacking structure, which includes a plurality of cells 10, a plurality of double-sided tapes 20, and foam; two battery cores 10 are stacked in the thickness direction and connected through a double-sided adhesive tape 20 to form a battery core group, and a plurality of battery core groups are connected to form a battery core stacked body; foam cotton is arranged between the adjacent cell groups and at two ends of the cell stacking body. A double-sided adhesive tape 20 is disposed between the contact surfaces of the two battery cells 10, and is used to fix the two battery cells 10. In the stacking process of the battery cells 10, a tool should be used to ensure that all the battery cells 10 are aligned along the length, width and height directions.

In a more preferred embodiment, as shown in fig. 1, the foam comprises: the cell stack comprises a first cell foam 30 and a second cell foam 40, wherein the first cell foam 30 is arranged between adjacent cell groups, and the second cell foam 40 is arranged at two ends of the cell stack. The second foam 40 plays a role of protecting the outer two-end cell 10.

In a more preferred embodiment, the first foam 30 is backed or glued on both sides.

In a more preferred embodiment, the back glue or glue is provided on the top of one side and the bottom of the other side of the first foam 30, respectively. The back glue or the gluing position is staggered up and down on two sides of the first foam 30 in the width direction, so that the overall thickness in the width direction can be reduced.

In a more preferred embodiment, the second foam 40 is single-sided backed or rubberized.

In a more preferred embodiment, a backing or glue is applied to the top and bottom of one side of the second foam 40, respectively.

In a more preferred embodiment, a thermal runaway prevention structure 50 for protecting the cell stack is further included, and the thermal runaway prevention structure 50 is disposed on top of the cell stack. The buffer function can be realized between the upper part of the battery cell and the outer layer structural member; and the device also can play the roles of preventing thermal runaway and protecting the outer structural member in the thermal runaway process of the battery core. The thermal runaway prevention structure 50 can prevent thermal runaway of the battery cell on one side from spreading, and maintain the temperature of the other side at a lower temperature all the time, so as to ensure the safety of the battery cell stack.

In a more preferred embodiment, the battery further includes a heat-conducting structural member 60 for fixing and exchanging heat in the battery cell stack, and the heat-conducting structural member 60 is disposed at the bottom of the battery cell stack. The heat conducting structure 60 can conduct away heat generated during charging and discharging of the battery cell 10. The heat conducting structural member 60 is in contact with a metal structural member with high heat conductivity outside the cell stacking structure, and performs heat exchange with the outside.

In a more preferred embodiment, the thermally conductive structure 60 is a thermally conductive adhesive.

During assembly, the two battery cores 10 are bonded by the double-sided adhesive tape 20 to form a battery core group, every two battery core groups are fixedly connected by the first foam 30, and the two sides of the first foam 30 are respectively glued on the upper part and the lower part to be bonded and fastened. The second foam 40 is used outside the two outermost battery cells 10 to play a role in buffering and protecting. The upper and lower parts of the contact surface of the second foam 40 and the battery core 10 are back-glued or gummed. The plurality of cell groups control all the cells 10 to align in the length direction, the width direction and the height direction through the tool, and ensure the consistency of the cell stacking body. A thermal runaway prevention structure 50 is installed at an upper portion of the cell stack, and a heat conductive structure 60 is installed at a lower portion of the cell stack.

The utility model provides an electricity core stacking structure has advantages such as simple structure, equipment are convenient, connect reliably, the structure is few, the percentage is high in groups, heat conductivility is excellent, the security is high. The battery cell packaging structure solves the important problems of complex assembly, more structural members, low packaging rate, poor heat conductivity and the like in the grouping process of the conventional secondary battery cells. The battery pack rate and the energy density of the secondary battery cell are effectively improved, the weight and the cost of the module are reduced, and a reasonable heat conduction path is provided for heat generated in the working process of the battery cell.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (9)

1. A cell stacking structure is characterized by comprising a plurality of cells (10), a plurality of double-sided adhesive tapes (20) and foam; the two battery cores (10) are stacked in the thickness direction and connected through the double-sided adhesive tape (20) to form a battery core group, and the plurality of battery core groups are connected to form a battery core stacked body; and the foam is arranged between the adjacent battery cell groups and at two ends of the battery cell stacking body.

2. The cell stacking structure of claim 1, wherein the foam comprises: the cell stacking structure comprises first foam (30) and second foam (40), wherein the first foam (30) is arranged between the adjacent cell groups, and the second foam (40) is arranged at two ends of the cell stacking body.

3. A cell stacking structure according to claim 2, wherein the first foam (30) is back-glued or gummed on both sides.

4. A cell stacking structure according to claim 3, wherein the adhesive is disposed on top of one side of the first foam (30) and on bottom of the other side of the first foam.

5. A cell stacking structure according to claim 2, wherein the second foam (40) is single-sided adhesive-backed or coated.

6. A cell stacking structure according to claim 5, wherein the glue or gum is provided on the top and bottom of one side of the second foam (40), respectively.

7. The cell stack structure of claim 1, further comprising a thermal runaway prevention structure (50) for protecting the cell stack, wherein the thermal runaway prevention structure (50) is disposed at the top of the cell stack.

8. The cell stack structure of claim 1, further comprising a thermally conductive structure (60) configured to fix and exchange heat with the cell stack, wherein the thermally conductive structure (60) is disposed at a bottom of the cell stack.

9. A cell stacking structure according to claim 8, wherein the thermally conductive structure (60) is a thermally conductive adhesive.

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