CN114937843A

CN114937843A - Group battery, foaming adhesive and consumer

Info

Publication number: CN114937843A
Application number: CN202210345961.0A
Authority: CN
Inventors: 郑万新; 吴明杰; 农文彬
Original assignee: Dongguan Poweramp Technology Ltd
Current assignee: Dongguan Poweramp Technology Ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2022-08-23
Also published as: WO2023185274A1

Abstract

The embodiment of the application provides a battery pack, a foaming adhesive and electric equipment, wherein the battery pack comprises a battery cell module, a first structural member and a first insulating member; the battery cell module comprises a plurality of battery cells stacked along a first direction, each battery cell comprises a battery cell shell, an electrode assembly and an electrode terminal, wherein the electrode assembly is arranged in the battery cell shell, the electrode terminal is connected to the electrode assembly and extends out of the battery cell shell, the first structural member is electrically connected with the plurality of battery cells, and the battery cells comprise first walls which are arranged opposite to the first structural member along a second direction which is vertical to the first direction; along a second direction, the first structural member comprises a first surface and a second surface which are oppositely arranged, and the first surface is closer to the battery cell shell than the second surface; along the second direction, at least part of first insulator is located between first wall and the first structure, and first insulator bonds with at least one in first face and the first wall, and first insulator includes the foaming glue, and the compressive strength of foaming glue is more than or equal to 1.5 MPa.

Description

Group battery, foaming adhesive and consumer

Technical Field

The application relates to the technical field of electrochemistry, in particular to a battery pack, a foaming adhesive and electric equipment.

Background

The secondary battery is widely applied to electric equipment such as electric vehicles, electric automobiles, intelligent storage equipment and unmanned aerial vehicles due to the characteristics of high energy density, multiple cycle times, long storage time and the like.

In the related art, the battery includes the casing and arranges the electric core module in the casing in, and electric core module includes a plurality of electric cores. The battery can be a soft package battery with a soft metal shell, and because the shell of the soft package battery is low in strength, when the battery is severely vibrated or falls from a high place, an electrode assembly in the battery core can break through the shell, so that the battery core and the battery are invalid, and the safety and the reliability of the battery are influenced.

Disclosure of Invention

An object of the embodiment of the application is to provide a battery pack, a foam rubber and an electric device, so as to reduce the failure probability of a battery and improve the safety and reliability of the battery. The specific technical scheme is as follows:

an embodiment of the first aspect of the present application provides a battery pack, including a battery cell module, the battery cell module includes a plurality of electric cores that stack up the setting along the first direction, the electric core includes the electric core casing and arranges in electrode subassembly in the electric core casing, and be connected to electrode subassembly extends the electrode terminal of electric core casing, the battery pack still includes:

a first structural member electrically connected to the plurality of cells, the cells including a first wall disposed opposite the first structural member in a second direction perpendicular to the first direction; along the second direction, the first structural member comprises a first face and a second face which are oppositely arranged, and the first face is closer to the cell shell than the second face;

and the first insulating part is at least partially positioned between the first wall and the first structural member along the second direction, is bonded with at least one of the first surface and the first wall, and comprises foaming adhesive, and the compression strength of the foaming adhesive is more than 1.5 MPa.

In the battery pack that this application embodiment provided, when the battery pack receives by the external impact such as eminence drops, be provided with first insulating part between first structure and electric core, the impact force accessible first insulating part that electric core received transmits to first structure, the shore hardness C of first structure is greater than the shore hardness C of electricity core casing, the probability of taking place damage phenomena such as fracture after first structure receives the impact force is lower, can reduce the probability that the inner structure of electric core breaks through electricity core casing, thereby reduce the probability that the battery became invalid, improve the security and the reliability of battery. The foaming glue has the advantages of light weight, low cost and the like. The first insulating part formed after foaming and curing of the foaming glue can have a compact surface layer, the stress is more uniform, and the risk of stress concentration in the first insulating part can be reduced. The foaming adhesive can better fill irregular gaps between adjacent electric cores. The compression strength of the foaming adhesive is more than or equal to 1.5MPa, the foaming adhesive has better toughness and strength, and the mechanical reliability and stability of the foaming adhesive are higher.

In some embodiments, the mass of a single cell is X1, wherein 150g < X1 ≦ 300 g.

In some embodiments, the mass of the single battery cell is X2, wherein X1 is more than 300g and less than or equal to 600g, the compressive strength of the foaming adhesive is more than or equal to 2MPa, the foaming adhesive has good toughness and strength, the mechanical reliability and stability of the foaming adhesive are high, and the probability of failure of the battery due to impact is reduced.

In some embodiments, the foam gum has a density of 0.3g/c ³ To 0.4g/c ³ . The density of the foaming adhesive meets the range, so that the density of the foaming adhesive is lower, and the quality and the cost of the foaming adhesive are reduced.

In some embodiments, the polystyrene foam has a resistivity of 10 or more ¹³ Omega cm. The foam rubber has better insulating property, and the occurrence of electricity interference between the foam rubber and the electrode terminal of the battery cell is reducedThe probability of interference.

In some embodiments, the dynamic viscosity of the foam is 1.45 × 10 ⁵ cps to 1.55 × 10 ⁵ And cps. The foaming adhesive has higher dynamic viscosity, the flow rate of the foaming adhesive during filling is reduced, and the process difficulty is reduced.

In some embodiments, the thixotropy index of the foam is greater than or equal to 5. The foaming glue has better damage resistance when stressed, is not easy to flow in all directions when filled, and reduces the process complexity.

In some embodiments, the shear strength of the foam rubber is greater than or equal to 2 Mpa. Therefore, the foaming adhesive has better toughness and strength, and the mechanical reliability and stability of the foaming adhesive are higher.

In some embodiments, the complete foaming time of the foaming adhesive is less than or equal to 10min, and the foaming adhesive has a shorter foaming time, so that the time cost for manufacturing the first insulating member and the battery pack can be reduced.

In some embodiments, the dielectric strength of the foam adhesive is greater than or equal to 18KV/mm, and the electrical reliability of the foam adhesive is high.

In some embodiments, the flame retardancy of the foam can be UL94 — V0@2mm, resulting in better thermal reliability of the foam.

In some embodiments, there is a gap between the first insulator and the first wall, the gap being less than 2mm in the second direction.

In some embodiments, there is a gap between the first insulator and the first face, the gap being less than 2mm in the second direction.

In some embodiments, the battery pack further includes a casing, the battery cell module and the first structural member are disposed in the casing, and the first structural member is fixedly connected to the casing. When the battery pack is subjected to external impact, the first wall can transmit impact force to the first structural member through the first insulating part, then the impact force is transmitted to the shell through the first structural member, and the probability that the internal structure of the battery cell shell breaks the battery cell shell can be further reduced by transmitting the impact force to the shell, so that the probability of battery cell failure is further reduced, and the safety and the reliability of the battery are improved.

In some embodiments, the housing includes a first sidewall and a second sidewall oppositely disposed along a third direction, and the first insulator is bonded to the first sidewall and/or the second sidewall along the third direction.

In some embodiments, the first insulating member is located between the electrode terminals of adjacent at least two battery cells in the first direction. Promote the protection to electrode terminal, further reduce the probability of electric core casing damage to further reduce the probability of battery inefficacy, improve the security and the reliability of battery.

In some embodiments, the cell casing includes a first portion for accommodating the electrode assembly, and a second portion extending outward from the first portion, the first wall is disposed on the first portion, the second portion is connected to the first wall, the electrode terminal extends out of the cell casing from the second portion, and the first insulator is located between the second portions of at least two adjacent cells along the first direction. When the battery pack is subjected to external impact, the impact force generated by the external impact can be better dispersed by the first insulating part, the damage probability of the battery cell shell is further reduced, the failure probability of the battery is further reduced, and the safety and the reliability of the battery are improved.

In some embodiments, the cell further comprises a first seal, a portion of the first seal being disposed at the second portion, a portion of the first seal extending out of the second portion;

along the first direction, the first insulating part is located between the first sealing parts of two adjacent battery cells and is bonded with the first sealing parts. First sealing member can be used to seal the clearance between second portion and the electrode terminal, can promote electrode terminal's protection, further reduces the probability of electric core casing damage to further reduce the probability of battery inefficacy, improve the security and the reliability of battery.

In some embodiments, the first seal member comprises a sealant.

In some embodiments, one end of the cell is provided with a first electrode terminal, and the first sealing member is used to seal a gap between the second portion and the first electrode terminal.

In some embodiments, the battery cell further comprises a second electrode terminal, and the second electrode terminal and the first electrode terminal are disposed at the same end of the battery cell.

In some embodiments, the cell further comprises a second seal, a portion of the second seal being disposed at the second portion, a portion of the second seal extending out of the second portion; the first insulating piece is located between the second sealing pieces of two adjacent battery cells and is bonded with the second sealing pieces. The second sealing member can be used for sealing the gap between the second part and the second electrode terminal, the protection to the electrode terminal is promoted, the probability of damage of the battery cell shell is further reduced, the probability of battery failure is further reduced, and the safety and the reliability of the battery are improved.

In some embodiments, the second seal member comprises a sealant.

In some embodiments, the projection of the first insulating member covers the projection of the first sealing member along the first direction, so as to further enhance protection of the battery cell, and the first insulating member can better disperse an impact force generated by an external impact.

In some embodiments, the projection of the first insulating member covers the projection of the second sealing member, so as to further enhance the protection of the battery cell, and enable the first insulating member to better disperse the impact force generated by external impact.

In some embodiments, the first insulator includes a first side and a second side disposed opposite to each other along a third direction, wherein the third direction is perpendicular to the first direction and the second direction; and viewed along the first direction, the first side has a first distance with the first sealing element along the third direction, and the first distance is more than or equal to 2 mm.

In some embodiments, the second side and the second sealing element have a second distance therebetween, the second distance is greater than or equal to 2mm, and the first insulating element can better fix the electrode terminal, so that the probability of abrasion and failure of the electrode terminal due to vibration is reduced.

In some embodiments, the second portion has a third distance from the first surface of the first structural member along the second direction, and the third distance is greater than or equal to 3mm, so that the insulating material can be fused and foamed better, and the foaming stability of the first insulating member is improved.

In some embodiments, the first wall includes a first region and a second region, the first region and the second region are respectively located on two sides of the second portion along the first direction, and the first insulating member is respectively bonded to the first region and the second region of the at least two battery cells. The electrode terminal of fixed electric core that can be better, the impact force that electrode terminal received can follow first direction transmission to first insulating part for the impact force that dispersion external impact that first insulating part can be better produced improves the security and the reliability of battery.

In some embodiments, along the second direction, the projection of the first insulating member covers the projections of the first region and the second region of the at least two battery cells, so as to increase the filling range and volume of the first insulating member, and enable the first insulating member to better disperse the impact force generated by external impact.

In some embodiments, the cell casing further includes a third portion extending outwardly from the first portion, and the first side is bonded to the third portion along the third direction; the battery cell shell further comprises a fourth part extending outwards from the first part, and the second side is bonded with the fourth part along the third direction; the third portion and the fourth portion are oppositely disposed along the third direction. After the electric core transmits the impact force to the first insulating part, the impact force can be transmitted to the first structural component in the first insulating part along the second direction, and can be transmitted to the third part and the fourth part in the first insulating part along the third direction, so that the impact force can be better dispersed by the first insulating part, the probability that the internal structure of the electric core shell breaks through the first wall is further reduced, the probability of battery failure is further reduced, and the safety and the reliability of the battery are improved.

In some embodiments, there is an overlap between a projection of the first insulating member and a projection of the third portion along the second direction, and the third portion may be used to limit a foaming path of the foaming glue during foaming of the insulating material, so as to define a foaming region of the foaming glue.

In some embodiments, there is an overlap between a projection of the first insulating member and a projection of the fourth portion along the second direction, and the fourth portion may be used to limit a foaming path of the foaming glue during foaming of the insulating material, so as to further define a foaming region of the foaming glue.

In some embodiments, the first side wall has a plurality of first recesses, and the first portion and the third portion are disposed in the first recesses, and the third portion and the first recesses can further limit the foaming path of the insulation material during the foaming process of the insulation material, thereby further defining the foaming region of the insulation material.

In some embodiments, the second sidewall has a plurality of second recesses, and the portion of the first portion and the portion of the fourth portion are disposed in the second recesses, and the fourth portion and the second recesses can further limit the foaming path of the insulating material during the foaming process of the insulating material, thereby further defining the foaming region of the insulating material.

In some embodiments, the battery pack includes a plurality of first insulating members, each first insulating member is disposed between two adjacent battery cells along the first direction, and at least some of the plurality of first insulating members are connected to form an integral structure, which can increase stability of the first insulating members.

Embodiments of the second aspect of the present application provide a foam gum comprising polyurethane.

Embodiments of the third aspect of the present application provide an electrical device, which includes any one of the above battery packs.

In the battery pack that this application embodiment provided, when the battery pack receives by the external impact such as eminence drops, be provided with first insulating part between first structure and electric core, the impact force accessible first insulating part that electric core received transmits to first structure, the shore hardness C of first structure is greater than the shore hardness C of electricity core casing, the probability of taking place damage phenomena such as fracture after first structure receives the impact force is lower, can reduce the probability that the inner structure of electric core breaks through electricity core casing, thereby reduce the probability that the battery became invalid, improve the security and the reliability of battery. The foaming glue has the advantages of light weight, low cost and the like. The first insulating part that forms after the foaming of foaming glue solidification can have a fine and close top layer, and the atress of first insulating part is more even, can reduce the risk of stress concentration in the first insulating part. The foaming adhesive can better fill irregular gaps between adjacent electric cores. The compression strength of the foaming adhesive is more than or equal to 1.5MPa, the foaming adhesive has better toughness and strength, and the mechanical reliability and stability of the foaming adhesive are higher.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and it is also obvious for a person skilled in the art to obtain other embodiments according to the drawings.

Fig. 1 is a schematic diagram of a structure of a battery pack according to some embodiments of the present application;

fig. 2 is a schematic view of another construction of a battery pack according to some embodiments of the present application;

fig. 3 is a schematic view of another structure of a battery pack according to some embodiments of the present disclosure;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 3;

fig. 6 is a schematic structural diagram of a cell according to some embodiments of the present disclosure;

FIG. 7 is an enlarged view of area A of FIG. 6;

fig. 8 is a schematic view of a partial structure of a battery pack according to some embodiments of the present application;

FIG. 9 is a schematic illustration of a first structural member according to some embodiments of the present application;

fig. 10 is a schematic structural diagram of a cell module according to some embodiments of the present disclosure;

fig. 11 is a top view of a battery pack according to some embodiments of the present application;

fig. 12 is another top view of a battery pack according to some embodiments of the present application;

FIG. 13 is a schematic view of a lower housing according to some embodiments of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an up and down orientation. The device may be otherwise oriented, such as rotated 90 degrees or at other orientations, and the spatially relative descriptors used herein interpreted accordingly.

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below by referring to the accompanying drawings and examples. It should be apparent that the described embodiments are only a few embodiments of the present application, and not all embodiments.

The technical solutions in the embodiments of the present application are described in detail below clearly, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. Unless defined otherwise, all 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. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Hereinafter, embodiments of the present application will be described in detail. This application may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and detailed and will fully convey the scope of the disclosure to those skilled in the art.

In addition, the dimensions or thicknesses of various components, layers, and/or layers may be exaggerated in the figures for clarity and conciseness. Like numbers refer to like elements throughout. As used herein, the term "and/or", "and/or" includes any and all combinations of one or more of the associated listed items. In addition, it should be understood that when element a is referred to as being "connected" element B, element a may be directly connected to element B, or intermediate element C may be present and element a and element B may be indirectly connected to each other.

Further, the use of "may" when describing embodiments of the present application refers to "one or more embodiments of the present application.

The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting of the application. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, values, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, values, steps, operations, elements, components, and/or groups thereof.

Spatially relative terms, such as "upper" and the like, may be used herein for convenience of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device or apparatus in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "upper" other elements or features would then be oriented "below" or "lower" the other elements or features. Thus, the exemplary term "up" can include both an orientation of above and below. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments. In this application, the first direction may be any direction in the plane of the first surface.

Some embodiments of the present application are described in detail below. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

As shown in fig. 1 to 10, an embodiment of the first aspect of the present application provides a battery pack 10, where the battery pack 10 includes a cell module 1, a first structural member 2, and a first insulating member 3. Wherein, the battery cell module 1 includes a plurality of battery cells 11 stacked along the first direction X, and the battery cell 11 includes a battery cell casing 12 and an electrode assembly 14 disposed in the battery cell casing 12, and an electrode terminal 13 connected to the electrode assembly 14 and extending out of the battery cell casing 12. The first structural member 2 is electrically connected to the plurality of battery cells 11, and in a second direction Z perpendicular to the first direction X, the battery cells 11 include first walls 121 disposed opposite to the first structural member 2, and in the second direction Z, the first structural member 2 includes first faces 21 and second faces 22 disposed opposite to each other, and the first faces 21 are closer to the cell casing than the second faces 22. Along the second direction Z, at least a portion of the first insulating member 3 is located between the first wall 121 and the first structural member 2, the first insulating member 3 is bonded to at least one of the first face 21 and the first wall 121, the first insulating member 3 includes a foam rubber, and a compressive strength of the foam rubber 3 is greater than or equal to 1.5 MPa.

Optionally, the battery cell 11 may include a lithium ion battery, a sodium ion battery, a magnesium ion battery, a solid-state battery, and the like, and optionally, the battery cell 11 is a flexible package battery cell. Optionally, the cell casing 12 includes an aluminum plastic film.

In the present embodiment, the electrode terminals 13 are used to draw out current in the electrode assembly 14. Optionally, the battery cell 11 includes a first electrode terminal 131 and a second electrode terminal 132. The first and

second electrode terminals

131, 132 are connected to the electrode assembly 14 and extend out of the cell casing 12. The first electrode terminal 131 and the second electrode terminal 132 have opposite polarities. The electrode assembly 14 may be formed by stacking or winding a first pole piece, a separator, and a second pole piece, the first pole piece and the second pole piece having opposite polarities. One end of the first electrode terminal 131 is disposed in the cell casing 12 and connected to the first pole piece, and the other end extends out of the cell casing 12. One end of the second electrode terminal 132 is disposed in the cell casing 12 and connected to the second pole piece, and the other end extends out of the cell casing 12.

In the embodiment of the present application, the first structural member 2 is electrically connected to the plurality of battery cells 11. Alternatively, the first structural member 2 is electrically connected to the first electrode terminal 131 and the second electrode terminal 132. The first structural member 2 may be a circuit board. Alternatively, the Circuit Board may be a PCB (Printed Circuit Board). Alternatively, a conductive sheet may be disposed on the circuit board, and the first electrode terminal 131 and the second electrode terminal 132 are electrically connected to the conductive sheet. The first electrode terminal 131 and the second electrode terminal 132 may be connected to the conductive sheet by welding. Optionally, the circuit board includes a battery management system, and may be used to perform charge management and discharge management on the battery cell module 1.

In some embodiments, the first structural member 2 may also be another insulating member. Alternatively, a through hole may be formed in the insulating member, the first electrode terminal 131 and the second electrode terminal 132 may be disposed on one side of the insulating member away from the cell casing 12 after passing through the through hole, and the electrode terminals 13 between the adjacent cells 11 may be connected to each other by welding or the like. Optionally, a conducting strip is disposed on a side of the insulating member away from the cell casing 12, and the electrode terminals 13 between the adjacent cells 11 may be connected to each other through the conducting strip, for example, the electrode terminals 13 and the conducting strip may be welded after being stacked.

The first insulating member 3 is formed by foaming and curing an insulating material after placing it between the adjacent cells 11. The insulating material includes, but is not limited to, foamed glue, etc. The first insulating member 3 is located between at least two adjacent battery cells 11 in the first direction X, and at least a part of the first insulating member 3 is located between the first face 21 and the first wall 121 of the cell casing 12 in the second direction Z. In the embodiment of the present application, the first insulating member 3 may be bonded to only the first face 21 or only the first wall 121. The first insulating member 3 may be bonded to both the first surface 21 and the first wall 121.

In some embodiments, an insulating material may be injected between the adjacent battery cells 11, the first structural member 2 is connected to the battery cell module 1 before the insulating material is foamed and cured, and the first insulating member 3 is formed after the insulating material is foamed and cured. Alternatively, the first insulating member 3 may be bonded to the first wall 121. Optionally, the first insulating member 3 may be bonded to both the first surface 21 and the first wall 121. Optionally, a gap (not shown) exists between the first insulating member 3 and the first wall 121, and the gap is smaller than 2mm in the second direction Z.

Alternatively, the first insulating member 3 is connected to the first surface 21, for example, the first insulating member 3 is connected to the first surface 21 in contact, for example, the first insulating member 3 and the first surface 21 may be connected by an adhesive substance, such as glue.

In some embodiments, an insulating material may be coated on the first surface 21 of the first structural member 2, the insulating material is connected to the first structural member 2 coated with the insulating material and the cell module 1 before foaming and curing, and then the insulating material is foamed and cured to form the first insulating member 3. Alternatively, the first insulating member 3 may be bonded to the first face 21, with at least a portion of the first insulating member 3 being disposed between the first face 21 and the first wall 121. Alternatively, the first insulating member 3 may be bonded to both the first surface 21 and the first wall 121. Optionally, a gap (not shown) exists between the first insulating member 3 and the first face 21, and the gap is smaller than 2mm in the second direction Z.

In some embodiments, the shore hardness C of the first structural member 2 is greater than the shore hardness C of the cell casing 12.

In the battery pack 10 provided in the embodiment of the present application, when the battery pack 10 receives external impacts such as dropping from a high place, a first insulating member 3 is disposed between the first structural member 2 and the battery cell 11, an impact force received by the battery cell 11 can be transmitted to the first structural member 2 through the first insulating member 3, shore hardness C of the first structural member 2 is greater than shore hardness C of the battery cell casing 12, the probability of damage phenomena such as fracture occurring after the first structural member 2 receives the impact force is lower, the probability of the internal structure of the battery cell 11 breaking the battery cell casing 12 can be reduced, thereby reducing the probability of battery failure, and improving safety and reliability of the battery.

The first insulating member 3 is located between the first wall 121 of the cell casing 11 and the first structural member 2, and the first insulating member 3 is bonded to the first wall 121 and/or the first structural member 2, so that when the electrode assembly 14 and the electrode terminal 13 inside the cell casing 12 move toward the first wall 121 under the action of an impact force to generate an impact force on the first wall 121, the first wall 121 can transmit the impact force to the first structural member 2 through the first insulating member 3, thereby reducing the probability that the electrode assembly 14 and the electrode terminal 13 break through the cell casing 12, and reducing the probability of battery failure.

The foaming glue has the advantages of light weight, low cost and the like. The first insulating part 3 that forms after the foaming glue foaming solidification can have a fine and close top layer, and the atress of first insulating part 3 is more even, can reduce the risk of stress concentration in the first insulating part 3. The foam rubber can better fill irregular gaps between the adjacent electric cores 11. The compression strength of the foaming adhesive is more than or equal to 1.5MPa, the foaming adhesive has better toughness and strength, and the mechanical reliability and stability of the foaming adhesive are higher.

In some embodiments, the compressive strength of the foam is related to the weight of the single cell 11. Optionally, X1 is the mass of the single cell 11, wherein X1 is more than 150g and less than or equal to 300g, the compressive strength of the foam rubber is greater than 1.5MPa, the foam rubber has good toughness and strength, the mechanical reliability and stability of the foam rubber are high, and the probability of failure of the battery due to impact is reduced.

Optionally, the mass of the single battery cell 11 is X2, wherein X2 is more than 300g and less than or equal to 600g, the compression strength of the foaming adhesive is more than 2MPa, the foaming adhesive has good toughness and strength, the mechanical reliability and stability of the foaming adhesive are high, and the probability of failure of the battery due to impact is reduced.

Optionally, the mass of the single battery cell 11 is X3, wherein X3 is greater than 600g and less than or equal to 900g, the compressive strength of the foaming adhesive is greater than 2MPa, the foaming adhesive has good toughness and strength, the mechanical reliability and stability of the foaming adhesive are high, and the probability of failure of the battery due to impact is further reduced.

The following will further describe the beneficial effects of the battery pack provided by the embodiments of the present application in conjunction with a plurality of embodiments. As shown in table 1, table 1 shows the results of the impact test performed on various battery packs. In the impact test, the battery pack is fixed on an acceleration table, the acceleration table is accelerated to 150g (g is 9.8) within a preset time period, the battery pack is respectively installed to three mutually perpendicular installation orientations, and in each installation orientation, the battery pack is impacted three times in the positive direction of the installation orientation and impacted three times in the negative direction of the installation orientation, and the condition of the battery pack after the impact is observed. The duration of the preset time period is related to the weight of the battery pack, and when the weight of the battery pack is less than 12kg, the duration of the preset time period is 6 ms; when the weight of the battery pack is greater than or equal to 12kg, the duration of the preset time period is 11 ms. The results of the experiment are shown in table 1:

TABLE 1

The standard that the impact passes is that after the battery pack is subjected to an impact experiment, the battery pack does not catch fire, leak or fail due to damage of a shell when being visually observed.

From Table 1, it can be seen. When the weight X of the single battery cell 11 meets the condition that X is more than 150g and less than or equal to 300g, when the compression strength of the foaming adhesive is less than 1MPa, the battery pack fails after an impact test, when the compression strength of the foaming adhesive is more than 1MPa, the probability of the impact failure of the battery pack after the impact test is lower, and when the compression strength of the foaming adhesive is more than 1.5MPa, the battery pack passes through after the impact test. As can be seen from the table 1, when the weight X of a single battery cell is more than 300g and less than or equal to 600g, the compressive strength of the foaming adhesive is more than 1.5MPa, and the probability of failure of the battery pack due to impact can be greatly reduced.

When the weight X of the single electric core 11 meets the condition that X is more than 300g and less than or equal to 600g, when the compression strength of the foaming adhesive is less than 1MPa, the battery pack is impacted and failed after the impact test, when the compression strength of the foaming adhesive is more than 1MPa, the probability of the impact failure of the battery pack after the impact test is higher, when the compression strength of the foaming adhesive is more than 1.5MPa, the probability of the impact failure of the battery pack after the impact test is lower, and when the compression strength of the foaming adhesive is more than 2MPa, the battery pack is impacted and passed after the impact test. As can be seen from the table 1, when the weight X of a single battery cell is more than 300g and less than or equal to 600g, the compressive strength of the foaming adhesive is more than 2MPa, and the probability of failure of the battery pack due to impact can be greatly reduced.

When the weight X of the single battery cell 11 is more than 600g and less than or equal to 900g, when the compressive strength of the foaming adhesive is more than 1MPa, the battery pack fails after an impact test, when the compressive strength of the foaming adhesive is more than 1.5MPa, the probability of the impact failure of the battery pack after the impact test is higher, and when the compressive strength of the foaming adhesive is more than 2MPa, the battery pack passes through after the impact test. As can be seen from the table 1, when the weight X of a single battery cell is more than 600g and less than or equal to 900g, the compressive strength of the foaming adhesive is more than 2MPa, and the probability of failure of the battery pack due to impact can be greatly reduced.

Further, taking as an example that 10 battery packs are tested in each pack, when the pass rate is 100%, the pack is considered to pass by impact, when the pass rate is greater than or equal to 80%, the pack is considered to have a low probability of failure by impact, when the pass rate is less than 80%, the pack is considered to have a high probability of failure by impact, and when the pass rate is less than or equal to 30%, the pack is considered to have a failure by impact.

The beneficial effects of the battery packs provided in the embodiments of the present application are further described below with reference to multiple sets of tests, where 10 battery packs are tested in each set, and the test results are shown in table 2:

TABLE 2

As can be seen from table 2, when the weight of the single cell 11 is 150g, 265g and 300g, and the compressive strength of the foam rubber is less than 1MPa, the pass rate of the battery pack in the impact test is less than or equal to 30%, the weight of the single cell is greater than 150g and less than or equal to 300g, and the compressive strength of the foam rubber is less than 1MPa, the battery pack fails in the impact test after the impact test. When the compression strength of the foaming adhesive is more than 1MPa, the impact test passing rate of the battery pack is more than or equal to 80%, the weight of the single electric core is more than 150g and less than or equal to 300g, and when the compression strength of the foaming adhesive is more than 1MPa, the impact passing or impact failure probability of the battery pack after the impact test is lower. When the compression strength of the foaming adhesive is more than 1.5MPa, the impact test passing rate of the battery pack is 100%, the weight of the single battery cell is more than 150g and less than or equal to 300g, and when the compression strength of the foaming adhesive is more than 1.5MPa, the battery pack passes through after the impact test.

The weight of the single electric core 11 is 450g and 545g, when the compression strength of the foaming adhesive is smaller than 1MPa, the impact test passing rate of the battery pack is 0, the weight of the single electric core is larger than 300g and smaller than or equal to 600g, and when the compression strength of the foaming adhesive is smaller than 1MPa, the battery pack fails after impact test. When the compression strength of the foaming adhesive is more than 1MPa, the impact test passing rate of the battery pack is less than 80%, the weight of the single electric core is more than 300g and less than or equal to 600g, and when the compression strength of the foaming adhesive is more than 1MPa, the impact failure probability of the battery pack after the impact test is higher. When the compression strength of the foaming adhesive is more than 1.5MPa, the impact test passing rate of the battery pack is more than 90%, the weight of the single electric core is more than 300g and less than or equal to 600g, and when the compression strength of the foaming adhesive is more than 1.5MPa, the impact passing or impact failure probability of the battery pack after the impact test is lower. When the compression strength of the foaming adhesive is more than 2MPa, the impact test passing rate of the battery pack is 100%, and when the weight of the single electric core is more than 300g and less than or equal to 600g and the compression strength of the foaming adhesive is more than 2MPa, the battery pack passes through after the impact test.

The weight of the single battery cell 11 is 700g and 900g, when the compression strength of the foaming adhesive is less than 1MPa, the impact test passing rate of the battery pack is 0, when the weight of the single battery cell is more than 600g and less than or equal to 900g, and when the compression strength of the foaming adhesive is less than 1MPa, the battery pack fails after impact test. When the compression strength of the foaming adhesive is more than 1MPa, the impact test passing rate of the battery pack is less than 80%, the weight of the single electric core is more than 600g and less than or equal to 900g, and when the compression strength of the foaming adhesive is more than 1MPa, the impact failure probability of the battery pack after the impact test is higher. When the compression strength of the foaming adhesive is more than 1.5MPa, the impact test passing rate of the battery pack is more than 90%, the weight of the single electric core is more than 600g and less than or equal to 900g, and when the compression strength of the foaming adhesive is more than 1.5MPa, the impact failure probability of the battery pack after the impact test is lower. When the compression strength of the foaming adhesive is more than 2MPa, the impact test passing rate of the battery pack is 100%, and when the weight of the single electric core is more than 600g and less than or equal to 900g and the compression strength of the foaming adhesive is more than 2MPa, the battery pack passes through after the impact test.

Further, the density of the foaming adhesive is 0.3g/cm ³ To 0.4g/cm ³ . The density of the foaming adhesive meets the range, so that the density of the foaming adhesive is lower, and the quality and the cost of the foaming adhesive are reduced.

Furthermore, the specific resistance of the foaming adhesive is more than or equal to 10 ¹³ And omega cm, the foam rubber has better insulating property, and the probability of electrical interference between the foam rubber and the electrode terminal 13 of the battery cell 11 is reduced.

Further, the dynamic viscosity of the foamed rubber is 1.45X 10 ⁵ cps to 1.55 × 10 ⁵ cps, so that the foaming adhesive has higher dynamic viscosity, the flow rate of the foaming adhesive during filling is reduced, and the process difficulty is reduced.

Furthermore, the thixotropic index of the foaming adhesive is more than or equal to 5. The thixotropic index of the foaming adhesive is more than or equal to 5, so that the foaming adhesive has better damage resistance when stressed, the foaming adhesive is not easy to flow in all directions when filled, and the process complexity is reduced.

Furthermore, the shear strength of the foaming adhesive is more than or equal to 2MPa, so that the foaming adhesive has better toughness and strength, and the mechanical reliability and stability of the foaming adhesive are higher.

Optionally, the mass of the single battery cell 11 is X1, wherein X1 is greater than 150g and less than or equal to 300g, the shear strength of the foam rubber is greater than 1.5MPa, the foam rubber has good toughness and strength, the mechanical reliability and stability of the foam rubber are high, and the probability of failure of the battery due to impact is reduced.

Optionally, the mass of the single battery cell 11 is X2, wherein X2 is more than 300g and less than or equal to 600g, the shear strength of the foaming adhesive is more than 2MPa, the foaming adhesive has good toughness and strength, the mechanical reliability and stability of the foaming adhesive are high, and the probability of failure of the battery due to impact is reduced.

The beneficial effects of the battery pack provided by the embodiment of the present application will be further described in conjunction with a plurality of embodiments. As shown in table 3, table 3 shows the results of the shear test performed on various battery packs.

TABLE 3

As can be seen from Table 3. When the weight X of the single battery cell 11 is more than 150g and less than or equal to 300g, the battery pack fails after a shearing experiment when the shearing strength of the foaming adhesive is less than 1MPa, the probability of the shear failure of the battery pack after the shearing experiment is lower when the shearing strength of the foaming adhesive is more than 1MPa, and the battery pack passes through after the shearing experiment when the shearing strength of the foaming adhesive is more than 1.5 MPa. As can be seen from the table 3, when the weight X of a single battery cell is more than 300g and less than or equal to 600g, the shear strength of the foaming adhesive is more than 1.5MPa, and the failure probability of the battery pack can be greatly reduced.

When the weight X of the single electric core 11 meets the condition that X is more than 300g and less than or equal to 600g, when the shear strength of the foaming adhesive is less than 1MPa, the battery pack is subjected to shear failure after a shear experiment, when the shear strength of the foaming adhesive is more than 1MPa, the battery pack is subjected to impact failure after the shear experiment, when the shear strength of the foaming adhesive is more than 1.5MPa, the probability of shear failure of the battery pack after the shear experiment is lower, and when the shear strength of the foaming adhesive is more than 2MPa, the battery pack passes through the shear after the shear experiment. As can be seen from the table 3, when the weight X of a single battery cell is more than 300g and less than or equal to 600g, the shear strength of the foaming adhesive is more than 2MPa, and the failure probability of the battery pack can be greatly reduced.

Further, taking 10 battery packs tested in each group as an example, when the pass rate is 100%, the group is considered to pass the shear test, when the pass rate is greater than or equal to 80%, the group is considered to have a low shear failure probability, when the pass rate is less than 80%, the group is considered to have a high shear failure probability, and when the pass rate is less than or equal to 30%, the group is considered to have a shear failure. The beneficial effects of the battery pack provided in the embodiments of the present application are further described below with reference to multiple sets of tests, where each set tests 10 battery packs, and the test results are shown in table 4:

TABLE 4

As can be seen from table 4, when the weights of the single cells 11 are 150g, 265g and 300g, and the shear strength of the foam adhesive is less than 1MPa, the shear test pass rate of the battery pack is less than or equal to 30%, the weight of the single cell is greater than 150g and less than or equal to 300g, and the shear strength of the foam adhesive is less than 1MPa, the battery pack fails in shear after the shear test. When the shear strength of the foaming adhesive is more than 1MPa, the shear test passing rate of the battery pack is more than or equal to 80%, the weight of the single electric core is more than 150g and less than or equal to 300g, and when the shear strength of the foaming adhesive is more than 1MPa, the shear passing or shear failure probability of the battery pack after the shear test is lower. When the shear strength of the foaming adhesive is more than 1.5MPa, the shear test passing rate of the battery pack is 100%, the weight of the single electric core is more than 150g and less than or equal to 300g, and when the shear strength of the foaming adhesive is more than 1.5MPa, the battery pack passes through after the shear test.

The weight of the single electric core 11 is 450g and 545g, when the shear strength of the foaming adhesive is less than 1MPa, the shear test passing rate of the battery pack is 0, the weight of the single electric core is more than 300g and less than or equal to 600g, and when the shear strength of the foaming adhesive is less than 1MPa, the battery pack fails in shearing after the shear test. When the shear strength of the foaming adhesive is more than 1MPa, the shear test passing rate of the battery pack is less than 80%, the weight of the single electric core is more than 300g and less than or equal to 600g, and when the shear strength of the foaming adhesive is more than 1MPa, the shear failure probability of the battery pack after the shear test is higher. When the shear strength of the foaming adhesive is more than 1.5MPa, the shear test passing rate of the battery pack is more than 90%, the weight of the single electric core is more than 300g and less than or equal to 600g, and when the shear strength of the foaming adhesive is more than 1.5MPa, the shear passing or shear failure probability of the battery pack after the shear test is lower. When the shear strength of the foaming adhesive is more than 2MPa, the shear test passing rate of the battery pack is 100%, and when the weight of the single electric core is more than 300g and less than or equal to 600g and the shear strength of the foaming adhesive is more than 2MPa, the battery pack passes through after the shear test.

Furthermore, the complete foaming time of the foaming adhesive is less than or equal to 10min, that is, the foaming adhesive has a shorter foaming time, and the time cost for manufacturing the first insulating member 3 and the battery pack 10 can be reduced.

Furthermore, the pressure resistance of the foaming adhesive is more than or equal to 18KV/mm, so that the electric reliability of the foaming adhesive is higher.

Further, the flame retardancy of the foam rubber can be UL94_ V0@2mm, so that the foam rubber has better thermal reliability.

In some embodiments, as shown in fig. 1, fig. 2, and fig. 3, the battery pack 10 further includes a casing 4, the battery cell module 1 and the first structural member 2 are disposed in the casing 4, and at least one side of the first structural member 2 is fixedly connected to the casing 4. In the embodiment of the present application, the casing 4 is used for providing accommodation space for the battery cell module 1 and the first structural member 2, etc., so as to protect the battery cell module 1 and the first structural member 2, and reduce the influence of the outside on the battery cell module 1 and the first structural member 2. The material of the housing 4 includes, but is not limited to, plastic, metal, alloy, and the like. Further, as shown in fig. 1, the housing 4 includes an upper housing 41 and a lower housing 42, and the upper housing 41 and the lower housing 42 are coupled to form a receiving space. The upper housing 41 and the lower housing 42 may be bonded or locked by a fastener such as a bolt or a screw, which is not limited in the present application. Further, the cell module 1 and the first structural member 2 are disposed in the lower case 42.

In some embodiments, the lower case 42 includes a first sidewall 421 and a second sidewall 422 oppositely disposed along the third direction Y, a third sidewall 423 oppositely disposed along the second direction Z with respect to the upper case 41, and a fourth sidewall 424 and a fifth sidewall 425 oppositely disposed along the first direction X. Alternatively, any side of the first structural member 2 may be fixedly connected with one or more of the first side wall 421, the second side wall 422, the fourth side wall 424 and the fifth side wall 425. Alternatively, the first structural member 2 and each side wall of the lower case 42 may be adhesively connected, and alternatively, the first structural member 2 and each side wall of the lower case 42 may be lockingly connected by a fastener such as a bolt, a screw, or the like.

When the battery pack 10 is subjected to an external impact, the first wall 121 can transmit the impact force to the first structural member 2 through the first insulating member 3, and then the first structural member 2 transmits the impact force to the casing 4, so that the impact force is transmitted to the casing 4 through the first structural member 2, and the casing 4 can further reduce the probability that the internal structure of the cell casing 12 breaks through the cell casing 12, thereby further reducing the probability of cell failure, and improving the safety and reliability of the battery. Optionally, the shore hardness C of the casing 4 is greater than the shore hardness C of the first structural member 2, the shore hardness C of the first structural member 2 is greater than the shore hardness C of the first insulating member 3, and the shore hardness C of the first insulating member 3 is greater than the shore hardness C of the cell casing 12.

In some embodiments, the first insulating member 3 is located between the electrode terminals 13 of at least two adjacent battery cells 11 along the first direction X. The first insulating part 3 is positioned between the parts of the electrode terminals 13 extending out of the cell shell 12, so that the protection of the electrode terminals 13 is improved, and the damage probability of the cell shell 12 is further reduced, thereby further reducing the failure probability of the battery and improving the safety and the reliability of the battery.

In some embodiments, the cell casing 12 includes a first portion 111 for housing the electrode assembly 14, and a second portion 112 extending outwardly from the first portion 111. The electrode terminal 13 extends out of the cell casing 12 from the second portion 112. The first wall 121 is disposed on the first portion 111, the second portion 112 is connected to the first wall 121, and the first insulating member 3 is located between the second portions 112 of at least two adjacent battery cells 11 along the first direction X.

In some embodiments, the first insulating member 3 is disposed between the second portions 112 of two adjacent battery cells along the first direction X. Alternatively, both sides of the first insulating member 3 in the first direction X may be bonded to the second portions 112 of two adjacent battery cells 11. When the battery pack 10 is subjected to external impact, the first insulating member 3 can better disperse impact force generated by the external impact, and the probability of damage of the cell shell 12 is further reduced, so that the probability of battery failure is further reduced, and the safety and reliability of the battery are improved.

In some embodiments, as shown in fig. 5, 6 and 7, the battery cell 11 further includes a first sealing member 15, and the first sealing member 15 may be used to seal a gap between the second portion 112 and the electrode terminal 13. A portion of the first seal 15 is disposed on the second portion 112, and a portion of the first seal 15 extends out of the second portion 112. The first insulating part 3 is located between the first sealing parts 15 of the two adjacent battery cells 11 and is bonded with the first sealing parts 15, so that the protection of the electrode terminals 13 is improved, and the damage probability of the battery cell shell 12 is further reduced, thereby further reducing the failure probability of the battery and improving the safety and the reliability of the battery. Optionally, the first sealing member 15 comprises a sealing glue.

In some embodiments, one end of the cell 11 is provided with a first electrode terminal 131, and the first sealing member 15 may be used to seal a gap between the second portion 112 and the first electrode terminal 131.

In some embodiments, as shown in fig. 6 and 7, the battery cell 11 further includes a second electrode terminal 132, and the second electrode terminal 132 and the first electrode terminal 131 are disposed at the same end of the battery cell 11. Optionally, the battery cell 11 further includes a second sealing member 16, and the second sealing member 16 may be used to seal a gap between the second portion 112 and the second electrode terminal 12. A portion of the second seal 16 is disposed at the second portion 112, with a portion of the second seal extending out of the second portion 112. The first insulating part 3 is located between the second sealing parts 16 of the two adjacent battery cells 11 and is bonded with the second sealing parts 16, so that the protection of the electrode terminal 13 is improved, the damage probability of the battery cell shell 12 is further reduced, the failure probability of the battery is further reduced, and the safety and the reliability of the battery are improved. Optionally, the second seal member 16 includes a sealant.

In some embodiments, the projection of the first insulating member 3 covers the projection of the first sealing member 15 along the first direction X, so as to further enhance the protection of the battery cell 11, and the first insulating member 3 can better disperse the impact force generated by the external impact.

In some embodiments, the projection of the first insulating member 3 covers the projection of the second sealing member 16 along the first direction X, so as to further enhance the protection of the battery cell 11, and enable the first insulating member 3 to better disperse the impact force generated by the external impact.

In some embodiments, as shown in fig. 4, a third distance L3 is provided between the second portion 112 and the first face 21 of the first structural member along the second direction Z, and the third distance L3 is greater than or equal to 3mm, so that the insulating material can be better fused and foamed, and the foaming stability of the first insulating member 3 is improved.

In some embodiments, the first insulating member 3 includes a first side 31 and a second side 32 opposite to each other along the third direction Y. Viewed in the first direction X, the first side 31 has a first distance L1 from the first seal 15 and the second side 32 has a second distance L2 from the second seal 16 in the third direction Y. Optionally, the length of the first distance L1 and/or the second distance L2 is greater than or equal to 2 mm. The first insulating member 3 covers the first sealing member 15 and the second sealing member 16, and the first side 31 extends beyond a side of the first sealing member 15 in the third direction Y, and the second side 32 extends beyond a side of the second sealing member 16 in the third direction Y. The first insulating member 3 can better fix the electrode terminal 13, and the probability of abrasion and failure of the electrode terminal 13 due to vibration is reduced.

In some embodiments, the cell casing 11 further includes a third portion 113 extending outward from the first portion 111, and the first side 31 is bonded to the third portion 113 along the third direction Y.

In some embodiments, the cell casing 11 further includes a fourth portion 114 extending outward from the first portion 111, and the second side 32 is adhered to the fourth portion 114 along the third direction Y. The third portion 113 and the fourth portion 114 are oppositely disposed along the third direction Y.

In some embodiments, there is an overlap between the projection of the first insulating member 3 and the projection of the third portion 113 along the second direction Y, and the third portion 113 may be used to limit the foaming path of the foaming glue during the foaming process of the insulating material, thereby defining a foaming area of the foaming glue. Optionally, there is an overlap between the projection of the first insulating member 3 and the projection of the fourth portion 114 along the second direction Y, and during the foaming process of the insulating material, the fourth portion 114 may be used to limit the foaming path of the foaming glue, so as to further define the foaming area of the foaming glue.

In the embodiment of the present application, the first side 31 of the first insulating member 3 is bonded to the third portion 113, and the second side 32 is bonded to the fourth portion 114. When the battery pack 10 is subjected to an external impact, after the battery cell 11 transmits the impact force to the first insulating member 3, the impact force may be transmitted to the first structural member 2 in the first insulating member 3 along the second direction Z, and may also be transmitted to the third portion 113 and the fourth portion 114 in the first insulating member 3 along the third direction Y, so that the first insulating member 3 may better disperse the impact force, and the probability that the internal structure of the battery cell case 11 breaks the first wall 121 is further reduced, thereby further reducing the probability of battery failure, and improving the safety and reliability of the battery.

In some embodiments, the first wall 121 includes a first region 1211 and a second region 1212, the first region 1211 and the second region 1212 are respectively located on two sides of the second portion 112 along the first direction X, and the first insulating member 3 is adhered to the first region 1211 and the second region 1212 of at least two of the cells 11.

In this embodiment of the application, as shown in fig. 10, the cell module 1 includes a first cell 11a, a second cell 11b, a third cell 11c, and a fourth cell 11d that are sequentially arranged in a direction opposite to the first direction X. The second region 1212 of the first cell 11a is disposed adjacent to the first region 1211 of the second cell 11 b. Alternatively, the first insulating member 3 may be bonded to the first region 1211 or the second region 1212 of the cell 11. The first insulating member 3 may be bonded to the second region 1212 of the first cell 11a and the first region 1211 of the second cell 11b, and may be bonded to the second region 1212 of the third cell 11c and the first region 1211 of the fourth region 11 d.

Optionally, the first insulating member 3 may be connected to both the first region 1211 and the second region 1212 of the battery cell 11. The first insulating material 3 may be bonded to the second region 1212 of the first cell 11a and the first region 1211 of the second cell 11b, bonded to the second region 1212 of the second cell 11b and the first region 1211 of the third region 11c, and bonded to the second region 1212 of the third cell 11c and the first region 1212 of the fourth cell 11 d.

In this embodiment, the first insulating member 3 is bonded to the first region 1211 and the second region 1212 of the at least two battery cells 11, respectively, so as to better fix the electrode terminal 13 of the battery cell 11, and an impact force applied to the electrode terminal 13 can be transmitted to the first insulating member 3 along the first direction X, so that the first insulating member 3 can better disperse an impact force generated by an external impact, and further reduce the probability that the electrode terminal 13 breaks the battery cell casing 12, thereby further reducing the probability of battery failure, and improving the safety and reliability of the battery.

In some embodiments, along the second direction Z, the projection of the first insulating member 3 covers the projections of the first region 1211 and the second region 1212 of at least two battery cells 11, so as to increase the filling range and the volume of the first insulating member 3, so that the first insulating member 3 can better disperse the impact force generated by the external impact.

Optionally, along the second direction Z, the projection of the first insulating member 3 may partially cover the projections of the first region 1211 and the second region 1212 of the two battery cells 11, so as to reduce the manufacturing cost of the first insulating member 3.

In some embodiments, the third portion 113 is connected to the first sidewall 421, and/or the fourth portion 114 is connected to the second sidewall 422, and the first sidewall 421 and the second sidewall 422 may limit the third portion 113 and the fourth portion 114, so as to further limit the battery cell 11, and improve stability of the battery cell 11.

As shown in fig. 11, 12 and 13, the first sidewall 421 has a plurality of first concave portions 4211. Portions of the first portion 111 and portions of the third portion 113 are disposed in the first indentation 4211, and during foaming of the insulation material, the third portion 113 and the first indentation 4211 may further restrict a foaming path of the insulation material, thereby further defining a foaming region of the insulation material. Optionally, the third portion 113 extends from the first concave portion 4211 along the third direction Z, and the first insulating member 3 is bonded to the portion of the first concave portion 4211 extending from the third portion 113.

Further, the second side wall 422 has a plurality of second recesses 4221, a portion of the first portion 111 and a portion of the fourth portion 114 are disposed in the second recesses 4221, and the fourth portion 114 and the second recesses 4221 can further limit a foaming path of the insulation material during foaming of the insulation material, so as to further define a foaming area of the insulation material. Optionally, the fourth portion 114 extends from the second concave portion 4221 along the third direction Z, and the first insulating member 3 is bonded to the portion of the second concave portion 4221 extending from the fourth portion 114.

Further, as shown in fig. 12, the first insulating member 3 is adhered to the first sidewall 421 or the second sidewall 422 along the third direction Y, and optionally, the first insulating member 3 is adhered to both the first sidewall 421 and the second sidewall 422.

In the embodiment of the present application, along the third direction Y, the first insulating member 3 is adhered to the first sidewall 421 and the second sidewall 422, and the first side 31 and the second side 32 are adhered to the first sidewall 421 and the second sidewall 422, respectively. The first sidewall 421 and the second sidewall 422 can limit the first insulating member 3. When the battery pack 10 is subjected to an external impact, an impact force may be transmitted from the first wall 121 of the battery cell 11 and the electrode terminal 13 to the first insulating member 3, and the impact force may be transmitted in the first insulating member 3 along the third direction Y to the first sidewall 421 and the second sidewall 422 with relatively high hardness, so as to further reduce the probability that the electrode assembly 14 and the electrode terminal 13 break the cell casing 12, thereby further reducing the probability of battery failure and improving the safety and reliability of the battery.

In some embodiments, the battery pack 10 includes a plurality of first insulating members 3, each first insulating member 3 is disposed between two adjacent battery cells 11 along the first direction X, and at least some first insulating members 3 of the plurality of first insulating members 3 are connected as a single body.

In the embodiment of the present application, at least some of the first insulating members 3 in the plurality of first insulating members 3 are foamed and fused and then connected to form an integral structure, which can increase the stability of the first insulating members 3. Further, a first insulating member 3 may be disposed between each two adjacent battery cells 11 in the plurality of battery cells 11. Furthermore, the first insulating members 3 are connected into a single structure.

Embodiments of the second aspect of the present application provide a foam adhesive, which is applied to the battery pack, and the foam adhesive includes polyurethane.

Embodiments of the third aspect of the present application provide an electric device, where the electric device includes the battery pack provided in the embodiments of the first aspect.

The electric equipment includes but is not limited to an unmanned aerial vehicle, an electric vehicle, a mobile phone, a notebook computer, an electric toy, an electric tool, an electric vehicle and the like. Since the electric device includes the battery pack in the embodiment of the first aspect, the electric device in the embodiment of the present application also has the advantages of the battery pack in any of the embodiments.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill 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 disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein, but is to be accorded the widest scope consistent with the claims.

Claims

1. A battery pack, includes electric core module, electric core module includes a plurality of electric cores of piling up the setting along the first direction, electric core includes the electric core casing and arranges in electrode subassembly in the electric core casing, and be connected to electrode subassembly extends the electrode terminal of electric core casing, its characterized in that, the battery pack still includes:

a first structural member electrically connected to the plurality of cells, the cells including a first wall disposed opposite the first structural member in a second direction perpendicular to the first direction; along the second direction, the first structural member comprises a first face and a second face which are oppositely arranged, and the first face is closer to the battery cell shell than the second face;

2. The battery pack of claim 1, wherein the mass of a single cell is X1, wherein 150g < X1 ≦ 300 g.

3. The battery pack of claim 1, wherein the mass of the single cell is X2, wherein 300g < X2 ≤ 600g, and the compressive strength of the foam is greater than 2.0 MPa.

4. The battery according to claim 1, wherein the foam has a density of 0.3g/cm ³ To 0.4g/cm ³ 。

5. The battery pack of claim 1, wherein the foam has a resistivity of 10 or more ¹³ Ω.cm。

6. The battery pack of claim 1, wherein the dynamic viscosity of the foam is 1.45 x 10 ⁵ cps to 1.55 × 10 ⁵ cps。

7. The battery according to claim 1, wherein the thixotropy index of the foam is greater than or equal to 5.

8. The battery pack according to claim 1, wherein the shear strength of the foam rubber is 2Mpa or more.

9. The battery pack according to claim 1, wherein a complete foaming time of the foaming glue is 10min or less.

10. The battery pack according to claim 1, wherein the dielectric strength of the foam is 18KV/mm or more.

11. The foaming adhesive is applied to a battery pack and is characterized by comprising polyurethane.

12. An electrical consumer, characterized in that the electrical consumer comprises a battery pack according to any one of claims 1 to 11.