CN217903346U

CN217903346U - Battery pack

Info

Publication number: CN217903346U
Application number: CN202222255858.5U
Authority: CN
Inventors: 何亚飞
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2022-08-25
Filing date: 2022-08-25
Publication date: 2022-11-25
Anticipated expiration: 2032-08-25

Abstract

The utility model relates to a battery pack, which comprises a plurality of battery cell stacking bodies and a tray, wherein the battery cell stacking bodies are arranged and installed in the tray, each battery cell stacking body is provided with a shell, and the bottom of the shell is provided with a plurality of first pressure relief holes; the tray is provided with a bottom plate which is abutted against the bottom of the shell, the bottom plate comprises an upper plate and a lower plate, the upper plate is provided with a plurality of second pressure relief holes, and the second pressure relief holes are aligned and communicated with the first pressure relief holes one by one; a plurality of explosion-proof valves are hermetically arranged on the lower plate; and an exhaust channel is arranged between the upper plate and the lower plate and is used for communicating the second pressure relief hole with the explosion-proof valve in a fluid mode. High-temperature gas generated by thermal runaway of the battery core can be discharged downwards to the outside of the battery pack through the explosion-proof valve of the tray bottom plate, so that the use safety is greatly improved.

Description

Battery pack

Technical Field

The utility model relates to a power battery field specifically relates to a battery pack.

Background

The power battery is a power source of a new energy automobile and mainly comprises a lithium iron phosphate battery, a lithium manganate battery, a ternary material battery and the like. The power battery is divided into a hard-package battery and a soft-package battery. Soft-package batteries are becoming mainstream due to their advantages of high energy sealing, low internal resistance, and the like.

Because the soft package battery pack is composed of a plurality of battery cells, when one battery cell is in thermal runaway, high-temperature gas generated by the thermal runaway needs to be rapidly discharged in order to avoid influencing other battery cells. Most of existing battery pack exhaust structures adopt side exhaust, namely an explosion-proof valve is arranged on the side face of a battery pack shell, so that high-temperature and high-pressure gas in a battery pack can be exhausted from the side face of the battery pack when the battery pack is damaged and burns. Therefore, a user is easily affected by high-temperature and high-pressure gas when getting off the vehicle, and the phenomenon such as scald is generated, thereby reducing the safety of the battery pack in use.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a high battery package of security.

In order to achieve the above object, the utility model adopts the following technical scheme:

according to the embodiment of the utility model, a battery pack is provided, wherein, the battery pack comprises a plurality of battery cell stacking bodies and a tray, the plurality of battery cell stacking bodies are arranged and installed in the tray, the battery cell stacking bodies are provided with a shell, and the bottom of the shell is provided with a plurality of first pressure relief holes; the tray is provided with a bottom plate which is abutted against the bottom of the shell, the bottom plate comprises an upper plate and a lower plate, the upper plate is provided with a plurality of second pressure relief holes, and the second pressure relief holes are aligned and communicated with the first pressure relief holes one by one; a plurality of explosion-proof valves are hermetically arranged on the lower layer plate; and an exhaust channel is arranged between the upper plate and the lower plate and is used for communicating the second pressure relief hole with the explosion-proof valve in a fluid mode.

In a preferred embodiment, the base plate is integrally extruded.

In a preferred embodiment, a plurality of reinforcing ribs are provided between the upper and lower deck plates.

In a preferred embodiment, the upper and lower plates have the same thickness.

In a preferred embodiment, the gap between the upper and lower plates is 1-3 times the thickness of the upper plate.

In a preferred embodiment, the first pressure relief holes and the second pressure relief holes are arranged in an array.

In a preferred embodiment, the first pressure relief hole and the second pressure relief hole are rectangular holes or "japanese" shaped holes.

In a preferred embodiment, the explosion-proof valve is arranged in the middle of the lower plate.

In a preferred embodiment, the cell stack body includes a plurality of cell units, the plurality of cell units are stacked in the casing along the width direction of the casing, two adjacent cell units are connected in series with each other, each cell unit includes a plurality of cell groups arranged along the length direction of the casing, two adjacent cell groups are connected in parallel with each other, and each cell group includes a plurality of cells connected in parallel.

In a preferred embodiment, the battery cell is a soft-package battery cell.

The above technical scheme is adopted in the utility model, the beneficial effect who has is that, the high-temperature gas that electric core thermal runaway produced can discharge to the battery package outside downwards through the explosion-proof valve of tray bottom plate, has improved the safety in utilization greatly.

Drawings

Fig. 1 is a perspective view of a battery pack according to an embodiment of the present invention;

fig. 2 is an exploded view of the battery pack shown in fig. 1;

FIG. 3 is a bottom view of the battery pack shown in FIG. 1;

FIG. 4 is an enlarged view at A in FIG. 3;

FIG. 5 is a top view of the tray of the battery pack shown in FIG. 1;

FIG. 6 is a cross-sectional view of the tray taken along line B-B of FIG. 5;

fig. 7 is a bottom view of the tray of the battery pack shown in fig. 1.

In the figure: 1. a cell stack body; 11. a housing; 111. a first pressure relief vent; 2. a tray; 21. an upper plate; 211. a second pressure relief vent; 22. a lower layer plate; 23. an exhaust passage; 24. reinforcing ribs; 3. an explosion-proof valve.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solutions of the present invention.

In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that an embodiment can be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Throughout the specification and claims, the word "comprise" and variations thereof, such as "comprises" and "comprising," are to be understood as an open, inclusive meaning, i.e., as being interpreted to mean "including, but not limited to," unless the context requires otherwise.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and/or" unless the context clearly dictates otherwise.

In the following description, for the sake of clarity, the structure and operation of the present invention will be described with the aid of directional terms, but the terms "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be understood as words of convenience and not as words of limitation.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.

Referring to fig. 1 to 3 and 7, fig. 1 and 2 show a battery pack including a plurality (15 shown) of cell stacks 1 and a tray 2, the cell stacks 1 being mounted in the tray 2 in an array (e.g., in a length direction of the tray 2). The cell stack 1 is elongated. The battery cell stack body 1 has a case 11, and a plurality of first pressure release holes 111 are provided in the bottom of the case 11. The tray 2 has a bottom plate abutting against the bottom of the housing 11, the bottom plate including an upper plate 21 and a lower plate 22, the upper plate 21 and the lower plate 22 being sealed together all around and having an air discharge passage 23 therebetween. The upper plate 21 is provided with a plurality of second pressure relief holes 211, and the second pressure relief holes 211 are communicated with the first pressure relief holes 111 in a one-to-one alignment manner. The lower plate 22 is provided with a plurality of mounting holes, and each mounting hole is hermetically provided with an explosion-proof valve 3. The vent passage 23 fluidly communicates the second relief hole 211 with the explosion-proof valve 3. That is, first pressure release hole 12, second pressure release hole 211, exhaust passage 23 and explosion-proof valve 3 constitute the exhaust structure of battery package, can arrange the high-temperature gas that electric core thermal runaway produced to exhaust passage 23 through first pressure release hole 111 and second pressure release hole 211 to through exhaust passage 23 circulation buffering back again via explosion-proof valve 3 from the bottom discharge downwards, improved the safety in utilization of battery package greatly.

The cell stack body 1 may generally include a plurality of cell units, wherein two adjacent cell units are connected in series with each other in the case 11 stacked in the width direction of the case 11, each cell unit includes a plurality of cell cores arranged in the length direction of the case, two adjacent cell cores are connected in parallel with each other, and each cell core includes a plurality of cells connected in parallel. Preferably, the battery cell is a soft-package battery cell, that is, the battery pack is a soft-package battery pack.

Preferably, the bottom plate of the tray 2 is integrally extruded, i.e. in an extruded profile structure. That is, the air discharge passage 23 is constituted by a cavity in the bottom plate. The base of the tray 2 may be made of a metal profile, such as an aluminium profile, or a polymer material, such as a high strength plastic.

As shown in fig. 6, a plurality of reinforcing ribs 24 are provided between the upper and

lower plates

21 and 22 in order to increase the support strength of the floor. The reinforcing ribs 24 divide the cavity (i.e., the vent passage 23) into a plurality of portions communicating with each other so that gas can be circulated throughout the cavity to relieve the discharge pressure thereof.

Preferably, the upper and

lower plates

21 and 22 are the same thickness to reduce the cost of the mold design. Further, the gap between the upper plate 21 and the lower plate 22 (i.e., the height of the air discharge passage 23) is 1 to 3 times the thickness of the upper plate 21. In a particular embodiment, the upper and

lower plates

21, 22 are each 2mm thick, with a gap of 5mm between the upper and

lower plates

21, 22.

As shown in fig. 3 and 5, the first pressure relief holes 111 and the second pressure relief holes 211 are arranged in an array. In this embodiment, the number of the corresponding first pressure relief holes 111 of each cell stack 1 is 3 × 4= 12. That is, the total number of the first pressure relief holes 111 and the second pressure relief holes 211 is 45 × 4= 180. It should be understood that the arrangement of the first and second

pressure relief holes

111 and 211 is not limited to the illustrated embodiment.

As shown in fig. 3-5, the first pressure relief vent 111 is a "japanese" shaped vent and the second pressure relief vent 211 is a rectangular shaped vent. The structure of the hole shaped like the Chinese character 'ri' can play a role of taking strength and pressure relief area into consideration, namely, the pressure relief area is increased as much as possible under the condition of ensuring that the strength is enough (namely, the caliber of the pressure relief hole is a little larger as possible). It should be understood that the first and second

pressure relief holes

111 and 211 may also be the same shape; in addition, the first and second

pressure relief holes

111 and 211 may have other shapes, for example, a square shape, a circular shape, an oval shape, or the like.

As shown in fig. 7, the explosion-proof valve 3 is disposed in the middle of the lower plate 22 of the tray 2, so that the discharged gas is concentrated in the middle area, and is not substantially diffused all around, further improving safety. In this embodiment, the number of the explosion-proof valves 3 is 4, and the valves are arranged in a square shape.

With continued reference to fig. 7, the bottom plate of the tray 2 may be divided into a plurality of equally sized sections that are sealingly connected together to prevent high temperature gas from leaking through gaps therebetween for ease of manufacture and installation. In the illustrated embodiment, the bottom plate of the tray 2 is divided into 5 sections, each of which correspondingly supports 3 cell stacks 1.

The preferred embodiments of the present invention have been described in detail, but it should be understood that various changes and modifications of the invention can be made by those skilled in the art after reading the above teaching of the present invention. Such equivalents are intended to fall within the scope of the claims appended hereto.

Claims

1. The battery pack is characterized by comprising a plurality of battery cell stacking bodies and a tray, wherein the battery cell stacking bodies are arranged and installed in the tray, each battery cell stacking body is provided with a shell, and the bottom of each shell is provided with a plurality of first pressure relief holes; the tray is provided with a bottom plate which is abutted against the bottom of the shell, the bottom plate comprises an upper plate and a lower plate, the upper plate is provided with a plurality of second pressure relief holes, and the second pressure relief holes are aligned and communicated with the first pressure relief holes one by one; a plurality of explosion-proof valves are hermetically arranged on the lower layer plate; and an exhaust channel is arranged between the upper plate and the lower plate and is used for communicating the second pressure relief hole with the explosion-proof valve in a fluid mode.

2. The battery pack of claim 1, wherein the base plate is integrally extruded.

3. The battery pack according to claim 1, wherein a plurality of reinforcing ribs are provided between the upper plate and the lower plate.

4. The battery pack according to claim 1, wherein the upper and lower plates have the same thickness.

5. The battery pack according to claim 4, wherein the gap between the upper plate and the lower plate is 1 to 3 times the thickness of the upper plate.

6. The battery pack of claim 1, wherein the first pressure relief vent and the second pressure relief vent are arranged in an array.

7. The battery pack of claim 1, wherein the first and second pressure relief holes are rectangular holes or "herringbone" holes.

8. The battery pack according to claim 1, wherein the explosion-proof valve is disposed in the middle of the lower plate.

9. The battery pack of claim 1, wherein the cell stack comprises a plurality of cell units, the plurality of cell units are stacked in the casing along a width direction of the casing, two adjacent cell units are connected in series with each other, each cell unit comprises a plurality of cell groups arranged along a length direction of the casing, two adjacent cell groups are connected in parallel with each other, and each cell group comprises a plurality of cells connected in parallel.

10. The battery pack of claim 9, wherein the cell is a pouch cell.