CN220796922U

CN220796922U - Battery pack, energy storage device and electric equipment

Info

Publication number: CN220796922U
Application number: CN202322291341.6U
Authority: CN
Inventors: 陈林
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2023-08-24
Filing date: 2023-08-24
Publication date: 2024-04-16
Anticipated expiration: 2033-08-24

Abstract

The utility model discloses a battery pack, an energy storage device and electric equipment. The tray is provided with a containing cavity, and the containing cavity is provided with an opening. The battery pack is arranged in the accommodating cavity and comprises a plurality of battery monomers. The cover plate is covered on the opening. The first gap between the cover plate and the battery pack is filled with the structural adhesive. The foaming glue is filled in the second gap between any two adjacent battery monomers. The structural adhesive is filled between the cover plate and the battery pack, so that the bonding strength between the battery pack and the cover plate can be improved on one hand; on the other hand, the cover plate is prevented from swelling, and the cover plate can stably cover the opening of the accommodating cavity.

Description

Battery pack, energy storage device and electric equipment

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack, an energy storage device and electric equipment.

Background

The power source of the electric automobile comprises a battery pack, and the battery pack is formed by connecting a plurality of batteries in series and parallel, so that the requirements of the electric automobile on high-capacity and high-voltage batteries are met.

In the related art, a battery pack includes an upper cover, a battery pack, a foaming adhesive, and a tray having a cavity in which the battery pack is placed, the upper cover being provided at an opening of the cavity. The foaming glue is filled in the battery pack.

However, the above-described structure of the upper cover is prone to bulge problems.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide a battery pack, an energy storage device and an electric device, which can avoid the problem of the bulging of the upper cover.

A battery pack according to an embodiment of the first aspect of the present utility model includes: tray, group battery, apron and structural adhesive.

The tray is provided with a containing cavity, and the containing cavity is provided with an opening. The battery pack is arranged in the accommodating cavity and comprises a plurality of battery monomers. The cover plate is covered on the opening.

The structural adhesive fills a first gap between the cover plate and the battery pack.

The foaming glue is filled in a second gap between any two adjacent battery monomers.

According to the embodiment, the structural adhesive is filled between the cover plate and the battery pack, so that the bonding strength between the battery pack and the cover plate can be improved; on the other hand, the cover plate is prevented from swelling, and the cover plate can stably cover the opening of the accommodating cavity.

According to some embodiments of the utility model, the structural adhesive is disposed on a surface of the cover plate facing the battery pack, and the structural adhesive covers a surface area that is at least 70% of a surface area of the cover plate facing the battery pack, or,

the structural adhesive is arranged on the surface of the battery pack, which faces the cover plate, and the surface area covered by the structural adhesive accounts for at least 70% of the surface area of the battery pack, which faces the cover plate. By the arrangement, on one hand, the bonding strength between the battery pack and the cover plate can be ensured to meet the design requirement; on the other hand, the use amount of the structural adhesive can be reduced, and excessive use of the structural adhesive is avoided.

According to some embodiments of the utility model, the structural adhesive is layered on the surface of the battery pack facing the cover plate, and the structural adhesive comprises a plurality of first strip areas which are arranged at intervals.

According to some embodiments of the utility model, the thixotropic index of the structural adhesive is from 3 to 5, and the density of the structural adhesive is less than or equal to 0.8g/cm ³ . When the thixotropic index of the structural adhesive is 3-5, the structural adhesive can not flow into the second gap of the battery pack from the foaming adhesive filling port, and the collapse problem caused by the lack of the structural adhesive in the first gap is avoided. And simultaneously, the structural adhesive can completely fill all areas of the first gap.

The density of the structural adhesive is less than or equal to 0.8g/cm ³ And the lightweight design of the battery pack is facilitated.

According to some embodiments of the utility model, the bond strength of the structural adhesive is greater than or equal to 5MPa. By the arrangement, the adhesive has good bonding strength, and the bonding strength between the battery pack and the cover plate can be ensured.

According to some embodiments of the utility model, the height of the foaming glue is H, and the height of the battery monomer is H, wherein H is more than or equal to 5mm and less than or equal to H. When the height h of the foaming glue is more than or equal to 5mm, the foaming glue can well ensure that all battery monomers are connected together, and the structural rigidity is improved.

According to some embodiments of the utility model, the bonding strength of the foaming glue is more than or equal to 1.5MPa, the tensile strength of the foaming glue is more than or equal to 3MPa, the Shore hardness of the foaming glue is more than 90A, and the foaming time of the foaming glue is more than or equal to 3min, so that the construction glue filling is facilitated. The foaming ratio of the foaming adhesive is more than or equal to 3, so that the lightweight design of the battery pack is facilitated; the volume resistivity of the foaming adhesive is more than or equal to 1.0x10 ¹² Omega cm, meets the insulation requirement of the battery pack.

According to some embodiments of the utility model, a plurality of the cells are arranged in an array, the cells comprising cylindrical cells.

An energy storage device according to an embodiment of the second aspect of the present utility model comprises the battery pack of the first aspect.

An embodiment of a third aspect of the utility model is a powered device comprising the battery pack of the first aspect.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is an exploded view of a battery pack according to an embodiment of the present utility model;

FIG. 2 is a sectional view taken along the direction A-A of FIG. 1;

fig. 3 is a schematic view of a structure of a battery pack according to an embodiment of the present utility model;

fig. 4 is a schematic diagram of a second structure of a battery pack according to an embodiment of the present utility model;

reference numerals:

tray 10, accommodation chamber 11, group battery 20, battery cell 21, post 211, apron 30, BDU40, structural adhesive 50, first rectangular area 51, foaming adhesive 60.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

The following disclosure provides many different embodiments, or examples, for implementing different structures of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the applicability of other processes and/or the use of other materials.

A battery pack according to an embodiment of the present utility model is described below with reference to the accompanying drawings.

As shown in fig. 1 to 4, the battery pack according to the embodiment of the first aspect of the present utility model includes a BDU40, a tray 10, a battery pack 20, a cover plate 30, a structural adhesive 50, and a foaming adhesive 60.

The tray 10 is provided with a receiving chamber 11, and the receiving chamber 11 has an opening. The BDU40 and the battery pack 20 are disposed in the accommodating chamber 11, and the BDU40 is located at one side of the battery pack 20. The battery pack 20 includes a plurality of battery cells 21. The cover plate 30 covers the opening.

The structural adhesive 50 fills the first gap between the cap plate 30 and the battery pack 20.

The foaming glue 60 fills the second gap between any adjacent two of the plurality of battery cells 21.

In practical application, the foam adhesive 60 fills the gap between any two adjacent battery cells 21, and the foam adhesive 60 also fills the gap between the cover plate 30 and the battery pack 20. This achieves the adhesive fixation between the battery pack 20 and the cap plate 30.

However, since the adhesive strength of the foaming glue 60 is generally weak, the adhesive strength between the battery pack 20 and the cap plate 30 is low.

Meanwhile, in order to ensure that the entire cavity inside the battery pack is completely filled, the foaming adhesive 60 is generally excessively added, causing the cover plate 30 to bulge.

Based on this, the structural adhesive 50 fills the first gap between the cap plate 30 and the battery pack 20. The foaming glue 60 fills the second gap between any adjacent two of the plurality of battery cells 21.

As shown in fig. 1 and 2, the first gap has a dimension L1 in the up-down direction, and the second gap has a dimension L2, L2 > L1 in the up-down direction. Considering that the second gap is larger, the foaming glue 60 is selected to fill the second gap, and the foaming glue 60 has high foaming multiplying power, so that the second gap can be completely filled, and the using amount is smaller.

Considering that the first gap is smaller, the structural adhesive 50 is selected to fill the first gap, the structural adhesive 50 has good bonding strength, and the foaming ratio is far smaller than that of the foaming adhesive 60. The structural adhesive 50 is filled between the cover plate 30 and the battery pack 20 instead of the foaming adhesive 60, so that the bonding strength between the battery pack 20 and the cover plate 30 can be improved; on the other hand, the cover plate 30 is prevented from swelling, and the cover plate 30 can stably cover the opening provided in the accommodating chamber 11.

In summary, the structural adhesive 50 is filled between the cover plate 30 and the battery pack 20 in the embodiment, so that the bonding strength between the battery pack 20 and the cover plate 30 can be improved; on the other hand, the cover plate 30 is prevented from swelling, and the cover plate 30 can stably cover the opening provided in the accommodating chamber 11.

In some embodiments of the present utility model, the structural adhesive 50 is disposed on the surface of the cover plate 30 facing the battery pack 20, and the structural adhesive 50 covers at least 70% of the surface area of the cover plate 30 facing the battery pack 20, or,

the structural adhesive 50 is disposed on a surface of the battery pack 20 facing the cover plate 30, and the surface area covered by the structural adhesive 50 occupies at least 70% of the surface area of the battery pack 20 facing the cover plate 30.

It should be noted that, the structural adhesive 50 may be layered on the surface of the cover 30 facing the battery pack 20, the area of the structural adhesive 50 may occupy 70% of the surface area of the cover 30 facing the battery pack 20, the area of the structural adhesive 50 may occupy 75% of the surface area of the cover 30 facing the battery pack 20, and the area of the structural adhesive 50 may occupy 80% and … … of the surface area of the cover 30 facing the battery pack 20, which is not shown in this embodiment.

Wherein preferably the structural adhesive 50 covers 70% of the surface area of the cover plate 30 facing the battery pack 20.

By the arrangement, on one hand, the bonding strength between the battery pack 20 and the cover plate 30 can be ensured to meet the design requirement; on the other hand, the usage amount of the structural adhesive 50 can be reduced, and excessive usage of the structural adhesive 50 is avoided.

Of course, it is understood that the structural adhesive 50 may be layered on the surface of the battery pack 20 facing the cover plate 30.

Specifically, as shown in fig. 3, the structural adhesive 50 is layered on the surface of the battery pack 20 facing the cap plate 30. The structural adhesive 50 includes a plurality of first strip regions 51, and the plurality of first strip regions 51 may be arranged at equal intervals in the left-right direction. The length of the first strip region 51 may be equal to the width of the battery pack 20, or the length of the first strip region 51 may be equal to the width of the cap plate 30.

Wherein, the thickness of the first strip area 51 is between 1mm and 5mm. One skilled in the art can select an appropriate thickness for the first stripe 51 based on the L1 values described above. For example, L1 is equal to the first stripe 51.

Of course, it is understood that the plurality of first elongated regions 51 may be arranged at non-intervals in the left-right direction.

In some embodiments of the present utility model, the thixotropic index of the structural adhesive 50 is between 3 and 5, and the density of the structural adhesive 50 is less than or equal to 0.8g/cm ³ 。

It should be noted that the thixotropic index may describe the ability of structural adhesive 50 to maintain its shape.

When the thixotropic index of the structural adhesive 50 is 3-5, the structural adhesive 50 cannot flow into the second gap of the battery pack 20 from the foaming adhesive filling port, and the collapse problem caused by the lack of the structural adhesive 50 in the first gap is avoided. While allowing the structural adhesive 50 to completely fill the various areas of the first gap.

In the related art, the density of the structural adhesive 50 is 1.3 to 1.5g/cm ³ Resulting in an increase in the overall weight of the battery pack.

Based on this, the density of the structural adhesive 50 of the present embodiment may be 0.8g/cm ³ The structural adhesive 50 may have a density of 0.7g/cm ³ The structural adhesive 50 may have a density of 0.6g/cm ³ … …, this embodiment is not exemplified. This arrangement contributes to the lightweight design of the battery pack.

In some embodiments of the present utility model, the adhesive strength of the structural adhesive 50 may be 5MPa, and the adhesive strength of the structural adhesive 50 may be 6MPa, … …, which is not shown in the present embodiment. This arrangement provides the adhesive with good adhesive strength, and ensures the adhesive strength between the battery pack 20 and the cap plate 30.

In some embodiments of the present utility model, the mixed viscosity of the structural adhesive 50 is less than or equal to 3000000cps to facilitate construction and adhesive bonding.

In some embodiments of the present utility model, the bulk resin of the structural adhesive 50 may be one or more of polyurethane, epoxy, acrylate, and their modifications to each other. One or more of hollow glass beads, low-density resin powder or expanded microspheres are added into the main resin.

In some embodiments of the present utility model, the height of the foam gel 60 is H, and the height of the battery cell 21 is H,5 mm.ltoreq.h.ltoreq.H.

In the specific embodiment, as described with reference to fig. 2, when the height h of the foam gel 60 is equal to or greater than 5mm, the foam gel 60 can ensure that the battery cells 21 are connected together, thereby improving the structural rigidity.

When the height h=h of the foam adhesive 60, the foam adhesive 60 fills the second gap, the dimension of the foam adhesive 60 in the up-down direction is equal to the dimension L2 of the second gap in the up-down direction, the uppermost portion of the foam adhesive 60 is flush with the top of the battery pack 20, the connection strength between the battery cells 21 is ensured to the greatest extent, and meanwhile, the overfilling of the foam adhesive 60 is avoided.

Preferably, the height h=h of the foaming glue 60.

In some embodiments of the present utility model, the adhesive strength of the foam gel 60 is greater than or equal to 1.5MPa, the tensile strength of the foam gel 60 is greater than or equal to 3MPa, the Shore hardness of the foam gel 60 is greater than 90A, and the foaming time of the foam gel 60 is greater than or equal to 3 minutes, so as to facilitate construction and gel filling.

In some embodiments of the present utility model, the foaming ratio of the foaming glue 60 is equal to or greater than 3, so as to facilitate the lightweight design of the battery pack. The volume resistivity of the foaming glue 60 is more than or equal to 1.0x10 ¹² Omega cm, the posts 211 of the individual cells 21 pass through CCThe S components (collection integration) are electrically connected, and other areas of the electrode removing post 211 of one battery unit 21 and other areas of the electrode removing post 211 of another battery unit 21 are mutually insulated through a filling structure, so as to meet the insulation requirement of the battery pack.

In some embodiments of the present utility model, the plurality of battery cells 21 are arranged in an array, and as shown in fig. 3, the plurality of battery cells 21 form battery rows, and each battery row is aligned in the front-rear direction. Wherein the battery cell 21 comprises a cylindrical battery.

Alternatively, as shown in fig. 4, a plurality of battery cells 21 form battery rows, and the respective battery rows are alternately arranged in the front-rear direction.

An energy storage device according to an embodiment of the second aspect of the present utility model includes the battery pack in the first aspect.

The energy storage device has the advantage of a battery pack, and the structural adhesive 50 is filled between the cover plate 30 and the battery pack 20, so that the bonding strength between the battery pack 20 and the cover plate 30 can be improved; on the other hand, the cover plate 30 is prevented from swelling, and the cover plate 30 can stably cover the opening provided in the accommodating chamber 11.

An embodiment of the third aspect of the utility model is a powered device comprising a battery pack as in the first aspect.

The electric equipment has the advantage of a battery pack, and the structural adhesive 50 is filled between the cover plate 30 and the battery pack 20, so that the bonding strength between the battery pack 20 and the cover plate 30 can be improved; on the other hand, the cover plate 30 is prevented from swelling, and the cover plate 30 can stably cover the opening provided in the accommodating chamber 11.

In the description of the present utility model, it should 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", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the description of the utility model, a "first feature" or "second feature" may include one or more of such features.

In the description of the present utility model, "plurality" means two or more.

In the description of the utility model, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.

In the description of the utility model, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, comprising:

a tray (10), wherein the tray (10) is provided with a containing cavity (11), and the containing cavity (11) is provided with an opening;

the battery pack (20), the battery pack (20) is set up in the said holding cavity (11), the said battery pack (20) includes a plurality of battery monomers (21);

a cover plate (30), wherein the cover plate (30) is arranged at the opening;

-a structural glue (50), the structural glue (50) filling a first gap between the cover plate (30) and the battery (20);

and the foaming glue (60) is filled in a second gap between any two adjacent battery cells (21).

2. The battery pack according to claim 1, wherein the structural adhesive (50) is disposed on a surface of the cover plate (30) facing the battery pack (20), and the structural adhesive (50) covers a surface area of at least 70% of a surface area of the cover plate (30) facing the battery pack (20), or,

the structural adhesive (50) is arranged on the surface of the battery pack (20) facing the cover plate (30), and the surface area covered by the structural adhesive (50) accounts for at least 70% of the surface area of the battery pack (20) facing the cover plate (30).

3. The battery pack according to claim 2, wherein the structural adhesive (50) is layered on the surface of the battery pack (20) facing the cover plate (30), and the structural adhesive (50) includes a plurality of first strip-shaped areas (51), and the plurality of first strip-shaped areas (51) are arranged at intervals.

4. The battery pack according to claim 1, wherein the thixotropic index of the structural adhesive (50) is 3 to 5, and the density of the structural adhesive (50) is 0.8g/cm or less ³ 。

5. The battery pack according to claim 1, wherein the adhesive strength of the structural adhesive (50) is not less than 5MPa.

6. The battery pack according to claim 1, wherein the height of the foam adhesive (60) is H, and the height of the battery cells (21) is H, and H is 5mm < H.

7. The battery pack according to claim 1, wherein the adhesive strength of the foam (60) is not less than 1.5MPa, the tensile strength of the foam (60) is not less than 3MPa, the shore hardness of the foam (60) is not less than 90A, the foaming time of the foam (60) is not less than 3min, the foaming ratio of the foam (60) is not less than 3, and the volume resistivity of the foam (60) is not less than 1.0x10 ¹² Ω·cm。

8. The battery pack according to claim 1, wherein a plurality of the battery cells (21) are arranged in an array, the battery cells (21) comprising cylindrical batteries.

9. An energy storage device comprising a battery pack according to any one of claims 1-8.

10. A powered device comprising the battery pack of any of claims 1-8.