CN219643011U

CN219643011U - Battery tray and battery pack

Info

Publication number: CN219643011U
Application number: CN202320620195.4U
Authority: CN
Inventors: 颜旭; 朱婷婷; 付静; 冯立臣; 郑卫鑫
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2023-03-20
Filing date: 2023-03-20
Publication date: 2023-09-05
Anticipated expiration: 2033-03-20

Abstract

The present disclosure relates to a battery tray and battery package, battery tray is used for placing a plurality of electric core monomers that set up side by side, and battery tray includes: the tray body is provided with at least one partition beam for separating the battery core monomers arranged side by side; the connecting piece is arranged across the partition beam and is used for electrically connecting the battery cell monomers positioned at the two sides of the partition beam; the support structure is arranged on the partition beam and is used for isolating the partition beam from the connecting piece; and the expansion piece is arranged between the connecting piece and the supporting structure and can expand after being heated so as to be attached to the connecting piece and the supporting structure. The expansion member may be a thermally expandable material. When a large amount of high-temperature smoke is generated after the battery cell monomer is out of control, the battery cell monomer can be heated to expand, gaps between the supporting structure and the connecting piece are blocked, so that the high-temperature smoke cannot flow from the out-of-control cavity to other cavities, the battery cell monomer in the other cavities is effectively protected, and the service life of the battery pack is prolonged.

Description

Battery tray and battery pack

Technical Field

The present disclosure relates to the field of batteries, and in particular, to a battery tray and a battery pack.

Background

In the related art, a battery pack is provided with two or more cavities, and the different cavities are separated by a partition beam; the module between adjacent cavities needs to be connected through the cross-over connection power row, at present, this kind of connected mode can lead to two cavities to be not completely isolated, can produce a large amount of high temperature flue gas when the thermal diffusion of module inside is caused after the electric core takes place thermal runaway, not effectual isolation between two cavities, the high temperature flue gas will be fleed other cavities from the cavity that is out of control, increase along with time, the temperature is accumulated other cavities in a large number, the electric core of other cavity insidely can lead to insulation failure because of high temperature, under the circumstances that has great pressure differential, two electric core PET membrane high temperature insulation failure of two cavities, will take place high pressure arc harm with the tray connection simultaneously, make the battery package impaired.

Disclosure of Invention

The disclosure aims to provide a battery tray and a battery pack to solve the problem that high-temperature smoke generated by thermal runaway of a battery cell in the related art flows into other cavities to cause insulation failure of the battery cells of the other cavities.

To achieve the above object, the present disclosure provides a battery tray for placing a plurality of battery cells arranged side by side, the battery tray comprising:

the tray body is provided with at least one partition beam for separating the battery cell monomers arranged side by side;

the connecting piece is arranged across the partition beam and is used for electrically connecting the battery cell monomers positioned at the two sides of the partition beam;

a support structure mounted on the partition beam and configured to isolate the partition beam from the connector;

and the expansion piece is arranged between the connecting piece and the supporting structure and can expand after being heated so as to be attached to the connecting piece and the supporting structure.

Optionally, the support structure comprises a bracket disposed below the connector, and the expansion member comprises a first expansion member disposed between below the connector and above the bracket.

Optionally, a recess is provided above the bracket, the connector is of an inverted U-shaped structure and spans the recess, and a bottom wall of the inverted U-shaped structure is received in the recess, and the first expansion member is disposed between the bottom wall of the inverted U-shaped structure and the recess.

Optionally, the concave portions are respectively provided with a baffle plate on both sides in the thickness direction of the partition beam, and the first expansion member is disposed between the two baffle plates.

Optionally, the support structure further comprises a protective cover disposed over the connection.

Optionally, the expansion member includes a second expansion member, the second expansion member is disposed between the protective cover and the connection member, and the second expansion member is capable of expanding after being heated to be attached to the connection member and the protective cover.

Optionally, an inner surface of the protective cover facing the connecting member is formed with a receiving groove, and the second expansion member is disposed in the receiving groove.

Optionally, the expansion member is bonded or coated on the support structure.

Optionally, the expansion member is made of a graphite material or a foaming material.

Optionally, the tray body includes the framework that is enclosed by a plurality of boundary beams, the wall roof beam is connected between two opposite boundary beams, wherein, bearing structure sets up the junction of wall roof beam with the boundary beam.

According to still another aspect of the present disclosure, there is provided a battery pack including a battery cell and a battery tray for setting the battery cell, the battery tray being the battery tray described above.

Through above-mentioned technical scheme, set up the expansion piece between connecting piece and bearing structure, the expansion piece can be the thermal expansion type material. When the battery cell monomer generates a large amount of high temperature flue gas after thermal runaway, the expansion piece can be heated and expanded, and the gap between the supporting structure and the connecting piece is blocked, so that the high temperature flue gas can not flow from the runaway cavity to other cavities, the battery cell monomer in other cavities is effectively protected, insulation failure caused by high temperature is prevented, and high-voltage arc discharge hazard caused by high-temperature insulation failure of a PET (Polyester Film) Film (polyethylene Film) of the battery cell monomer under the condition of large pressure difference is prevented, thereby effectively protecting the battery pack and prolonging the service life of the battery pack.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

fig. 1 is a schematic view of a battery tray according to one embodiment of the present disclosure.

Fig. 2 is an enlarged view of a portion a of fig. 1.

Fig. 3 is an exploded view of a battery tray according to an embodiment of the present disclosure, with the tray body removed.

Fig. 4 is a side view of a battery tray with the tray body removed according to one embodiment of the present disclosure.

Fig. 5 is a schematic view of a rack and a first expansion member in a battery tray according to one embodiment of the present disclosure.

Fig. 6 is a schematic view of a battery tray protective cover and a second expansion member according to one embodiment of the present disclosure.

Description of the reference numerals

1-a tray body; 11-partition beams; 12-side beams; a 2-connector; 3-a bracket; 31-a recess; 311-baffle plates; 41-a first expansion member; 42-a second expansion member; 5-protective cover.

Detailed Description

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

In the present disclosure, unless otherwise stated, terms such as "upper" and "lower" are used to define the arrangement direction of the battery pack in actual use _， "inner" and "outer" are defined with respect to the contours of the corresponding components. The terms "first," "second," and the like, as used herein, are used for the purpose of distinguishing between different elements and not necessarily for a sequential or chronological order. Furthermore, in the following description, when referring to the drawings, the same reference numerals in different drawings denote the same or similar elements unless otherwise explained.

In the prior art, structural adhesive blocking is sometimes adopted between a connecting piece and a support on a battery tray, although the operation is more convenient, the cost is lower, the defect still exists, the structural adhesive has certain flowing property and can not be effectively filled, gaps still exist between the bottom of the connecting piece and the support, the gap can not be effectively blocked, and the structural adhesive is easily melted after being heated, so that blocking failure is caused, a plurality of accommodating cavities of the battery tray are not effectively isolated, high-temperature flue gas can flow from the uncontrolled accommodating cavities to other accommodating cavities, a large amount of temperature is accumulated to other accommodating cavities along with the time increase, and the electric core inside the other accommodating cavities can be caused to be in insulation failure due to high temperature.

Specifically, according to an embodiment of the present disclosure, a battery tray may be provided, as shown in fig. 1 to 6, which may be used to place a plurality of battery cells arranged side by side, and may include at least a tray body 1, a connection member 2, a support structure, and an expansion member. Wherein, be provided with at least one wall roof beam 11 on the tray body 1 for separate the electric core monomer that sets up side by side, connecting piece 2 spanned wall roof beam 11 setting, be used for the electric core monomer that is located wall roof beam 11 both sides of connecting, bearing structure installs on wall roof beam 11 to be used for isolating wall roof beam 11 and connecting piece 2, the expansion piece can set up between connecting piece 2 and bearing structure, the expansion piece can be after being heated expansion, in order to laminate with connecting piece 2 and bearing structure. It should be noted that the connection member 2 may be a bridging aluminum row, or may be other bridging members or connection members, such as a wire harness connection member, which is not limited in this disclosure.

Through the above technical scheme, the expansion piece is arranged between the connecting piece 2 and the supporting structure, and the expansion piece can be made of a heated expansion material. When a great amount of high-temperature smoke is generated after the electric core monomer is out of control, the expansion piece can be heated and expanded, the gap between the supporting structure and the connecting piece 2 is blocked, so that the high-temperature smoke cannot flow from the out-of-control cavity to other cavities, the electric core monomer in the other cavities is effectively protected, insulation failure caused by high temperature is prevented, and high-voltage arc discharge damage caused by high-temperature insulation failure of a PET film of the electric core monomer is prevented under the condition of large pressure difference, thereby effectively protecting a battery pack and prolonging the service life of the battery pack.

Further, as shown in fig. 2 to 5, the support structure may include a bracket 3 disposed below the connection member 2, and the expansion member may include a first expansion member 41 disposed between the lower side of the connection member 2 and the upper side of the bracket 3 to fill a gap between the lower side of the connection member 2 and the upper side of the bracket 3 when the battery pack is thermally out of control.

Further, as shown in fig. 2 to 5, a recess 31 may be provided above the bracket 3, and the recess 31 may be configured such that a top end of the bracket 3 is recessed toward a middle area of the bracket 3, and may be rectangular or trapezoidal, which is not limited in the present disclosure. The connection member 2 may have an inverted U-shaped structure and spans the recess 31, and a bottom wall of the inverted U-shaped structure is accommodated in the recess 31 so that the connection member 2 is not higher than the highest position of the bracket 3, and the bracket 3 limits the connection member 2 in the length direction of the partition beam 11, where the length direction refers to the direction in which the partition beam 11 extends. The whole structure of the connecting piece 2 and the bracket 3 is further reduced while the connecting piece 2 is limited, so that the space is saved. The first expansion member 41 may be disposed between the bottom wall of the inverted U-shaped structure and the recess 31, and when the cell unit is thermally out of control, the first expansion member 41 may expand to close the gap between the bottom wall of the connector 2 and the recess 31 after being heated.

Further, as shown in fig. 2 to 5, the concave portion 31 is provided with the baffle plates 311, respectively, on both sides in the thickness direction of the partition beam 11, and the first expansion element 41 is provided between the two baffle plates 311. A groove is formed between the two baffles 311 to limit the first expansion member 41, and the first expansion member 41 is arranged in the groove to prevent the first expansion member 41 from being separated or ectopic by external force in the installation process, thereby affecting the blocking effect of the first expansion member 41 during working.

According to one embodiment of the present disclosure, as shown in fig. 3 and 4, before the first expansion member 41 is expanded, the gap D between the upper surface of the first expansion member 41 and the lower surface of the connection member 2 is generally 7mm to 8mm due to unavoidable installation errors, manufacturing errors, and the like, and the gap can be effectively blocked by reasonably disposing the first expansion member 41 of a certain thickness.

According to one embodiment of the present disclosure, as shown in fig. 2 to 6, the support structure may further include a protective cover 5 disposed over the connection member 2, and the protective cover 5 may be connected with the bracket 3. One end of the protective cover 5 may be rotatably connected to the bracket 3, and the other end is provided with a buckle to be fixed or opened with the bracket 3, or may be fixedly connected to the bracket 3 by a screw, which is not limited in the present disclosure. The protection cover 5 provides protection and insulation for the connecting piece 2, and when the battery pack encounters jolt and other conditions, the protection cover 5 can fix the connecting piece 2, so that the connecting piece 2 is not easy to shake, and the connecting piece 2 is prevented from being damaged.

Further, as shown in fig. 2 to 6, the expansion member may include a second expansion member 42, and the second expansion member 42 may be disposed between the protection cover 5 and the connection member 2, and the second expansion member 42 may be capable of expanding after being heated to be attached to the connection member 2 and the protection cover 5. When a large amount of high-temperature smoke is generated after the electric core monomer is out of control, the second expansion piece 42 can be heated and expanded, the gap between the protective cover 5 and the top wall of the connecting piece 2 is further plugged, the possibility that the high-temperature smoke flees from the out-of-control cavity to other cavities is reduced, the electric core monomer in the other cavities is effectively protected, insulation failure caused by high temperature is prevented, and under the condition of large pressure difference, the high-pressure arc discharge hazard caused by the high-temperature insulation failure of the PET Film (Polyester Film) of the electric core monomer is prevented, so that the battery pack is effectively protected, and the service life of the battery pack is prolonged.

Further, as shown in fig. 6, the inner surface of the protecting cover 5 facing the connecting piece 2 may be formed with a receiving groove, and the second expansion piece 42 is disposed in the receiving groove to limit the second expansion piece 42, so as to prevent the second expansion piece 42 from being separated or ectopic by external force during the installation process, and influence the blocking effect of the second expansion piece 42 during the operation.

According to one embodiment of the present disclosure, the expansion member may be adhered or coated on the support structure, and when the above-described first expansion member 41 and second expansion member 42 are included, the first expansion member 41 may be disposed under the connection member 2 and adhered or coated on the support structure, i.e., the first expansion member 41 may be adhered to the bracket 3, and the second expansion member 42 may be adhered or coated on the protective cover 5. The first expansion member 41 and the second expansion member 42 are prevented from being separated or displaced by external force during the installation process, and the blocking effect of the first expansion member 41 and the second expansion member 42 during operation is prevented.

In the embodiment where the first expansion member 41 and the second expansion member 42 are coated on the stent 3 and the protective cover 5, respectively, the first expansion member 41 and the second expansion member 42 may be expandable fireproof coatings coated on the surface of the stent 3 or the protective cover 5. Taking the case of coating the surface of the protection cover 5 with a fireproof coating as an example, in another embodiment of the present disclosure, the protection cover 5 may be integrally injection molded of polyphenylene ether, and the lower surface of the protection cover 5 may be provided with an expandable fireproof coating, and the thickness of the coating may be selected from 0.5mm to 2.5mm, which is not limited in the present disclosure. When the battery pack is assembled or airtight detected at normal temperature, the unexpanded fireproof coating can not block the air paths among different cavities, and the air paths among different cavities can be communicated, so that the detection of the airtightness of the whole pack is ensured. When the thermal runaway of the battery cell occurs, when the generated high-temperature electrolyte gas contacts the fireproof coating, the thickness of the fireproof coating is set to be 1mm as an example, when the high-temperature electrolyte gas contacts the fireproof coating, the limit of the fireproof coating can be heated and expanded to 10mm, the fireproof coating can be heated and expanded rapidly, the air passage is filled and plugged, free circulation of heat and high-temperature gas between different cavities is effectively prevented, the high-temperature gas is prevented from spreading to adjacent cavities, the battery cells in other cavities are influenced, further aggravation of heat diffusion is caused, fire disaster is prevented from being initiated, the whole vehicle is damaged, and loss is reduced while the safety is improved. After the fireproof coating is heated and expanded, the subsequent maintenance only needs to repair or replace the battery pack, and the damage to the whole vehicle is avoided, so that the further loss and damage are avoided, and the maintenance cost is reduced. In addition, in the case that the upper portion of the battery pack is provided with the battery pack sealing cover body, the protective cover 5 is provided under the cover body, and in order to ensure sealability between the battery pack cover body and the protective cover 5, the upper surface of the protective cover 5 may also be provided with an expandable fireproof coating to further block the spread of high-temperature gas.

According to an embodiment of the present disclosure, the main component of the expansion member may be made of a graphite material or a foaming material, the material is a thermal expansion material, the material composition plays a role in fire protection and is an expansion fire-retardant system, and the expansion member is divided into a chemical expansion system and a physical expansion system according to principles, wherein the graphite material belongs to the physical expansion system, the foaming material belongs to the chemical expansion system, and the foaming material may at least include: the carbonization agent (such as polypentaerythritol), the dehydration catalyst (such as ammonium polyphosphate) and the foaming agent (such as melamine) can be rapidly expanded to form a heat insulation layer when the temperature reaches a set standard, and the heat insulation layer has good temperature and fire resistance, and gaps between the bracket 3 and the connecting piece 2 and gaps between the connecting piece 2 and the protective cover 5 are effectively filled after the material is expanded, so that effective isolation between each accommodating cavity is realized, and the arc discharge risk is reduced.

According to one embodiment of the present disclosure, as shown in fig. 1 and 2, the tray body 1 includes a frame body surrounded by a plurality of side beams 12, and the partition beams 11 are connected to the two opposite side beams 12, wherein a support structure may be provided at the junction of the partition beams 11 and the side beams 12. The edge of the bracket 3 in the supporting structure can be provided with an extension part to be attached to the surface of the side beam 12, and the extension part can be further provided with a side beam boss which is fixed with the side beam 12 more tightly, so that the damage of the connecting piece 2 caused by the falling of the bracket 3 is prevented.

On the basis of the above scheme, the disclosure also provides a battery pack, and the battery pack can include electric core monomer and be used for setting up the single battery tray of electric core, and battery tray is above-mentioned battery tray, cuts off roof beam 11 also can separate into a plurality of holding chamber with tray body 1, holds and is provided with a plurality of electric core monomer that set up side by side in the chamber, and this battery pack has all beneficial effects of above-mentioned battery tray, and this is unnecessary here.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims

1. A battery tray for placing a plurality of battery cells arranged side by side, the battery tray comprising:

2. The battery tray of claim 1, wherein the support structure comprises a bracket disposed below the connector, and the expansion member comprises a first expansion member disposed between below the connector and above the bracket.

3. The battery tray of claim 2, wherein a recess is provided above the bracket, the connector is of an inverted U-shaped configuration and spans the recess, and a bottom wall of the inverted U-shaped configuration is received in the recess, the first expansion member being disposed between the bottom wall of the inverted U-shaped configuration and the recess.

4. A battery tray according to claim 3, wherein the recess is provided with baffles on both sides in the thickness direction of the partition beam, respectively, and the first expansion member is provided between the two baffles.

5. The battery tray of any one of claims 1-4, wherein the support structure further comprises a protective cover disposed over the connector.

6. The battery tray of claim 5, wherein the expansion member comprises a second expansion member disposed between the protective cover and the connector, the second expansion member being capable of expanding after being heated to conform to the connector and the protective cover.

7. The battery tray according to claim 6, wherein an inner surface of the protective cover facing the connection member is formed with a receiving groove, and the second expansion member is disposed in the receiving groove.

8. The battery tray of claim 1, wherein the expansion member is bonded or coated on the support structure.

9. The battery tray of claim 1, wherein the expansion member is made of a graphite material or a foamed material.

10. The battery tray of claim 1, wherein the tray body comprises a frame surrounded by a plurality of side rails, the partition beam being connected between two opposing side rails, wherein the support structure is disposed at the intersection of the partition beam and the side rails.

11. A battery pack, comprising a battery cell and a battery tray for setting the battery cell, wherein the battery tray is the battery tray according to any one of claims 1 to 10.