CN210467905U

CN210467905U - Battery pack

Info

Publication number: CN210467905U
Application number: CN201920975401.7U
Authority: CN
Inventors: 李立国; 杨从梅; 张亚媛; 孙松伟; 华剑锋; 田硕; 孟庆然
Original assignee: Beijing Key Power Technology Co ltd
Current assignee: Beijing Key Power Technology Co ltd
Priority date: 2019-06-26
Filing date: 2019-06-26
Publication date: 2020-05-05
Anticipated expiration: 2029-06-26

Abstract

The utility model provides a battery pack, include: a housing having an accommodating chamber; the battery cells are arranged in the accommodating cavity at intervals; the heat absorbent is arranged in the accommodating cavity, the heat absorbent is arranged between any two adjacent electric cores, the heat absorbent can absorb heat to generate gas, and the gas generated by the heat absorbent can be discharged to the outside of the shell. When a certain electric core is overheated like this, the heat that the electricity core produced can be absorbed to the heat absorbent, and the outside that the gas of production can be discharged the casing takes away a large amount of heats, has avoided the diffusion of group battery thermal runaway like this to and the problem of explosion on fire. Therefore, the technical scheme can inhibit thermal runaway spread of the battery pack and improve safety.

Description

Battery pack

Technical Field

The utility model relates to a new forms of energy technical field particularly, relates to a group battery.

Background

For thermal safety measures of battery packs, BMS thermal management, cooling, PTC or inter-string fuses are currently commonly used. Although these methods can effectively reduce the thermal safety accident of the battery pack, the occurrence of thermal runaway of the battery cannot be avoided. Once the thermal runaway of the battery is propagated, fire and explosion can be caused, which can cause serious threats to the personal safety and property safety of drivers and passengers.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery pack to the battery pack of solving among the prior art takes place thermal runaway's problem easily.

In order to solve the above problem, the utility model provides a battery pack, include: a housing having an accommodating chamber; the battery cells are arranged in the accommodating cavity at intervals; the heat absorbent is arranged in the accommodating cavity, the heat absorbent is arranged between any two adjacent electric cores, the heat absorbent can absorb heat to generate gas, and the gas generated by the heat absorbent can be discharged to the outside of the shell.

Further, have the gas vent with holding the chamber intercommunication on the casing, the group battery still includes: and the plug is plugged at the air outlet and can be opened at preset pressure and/or preset temperature.

Further, the casing includes body and apron, and the body has the chamber and holds the opening that the chamber communicates with holding, and the apron shutoff has a plurality of mouths and a plurality of gas vents of dodging on the apron at the opening part, and the one end one-to-one of a plurality of electric cores wears out from a plurality of mouths of dodging and holds the chamber, and arbitrary adjacent two dodge and all have the gas vent between the mouth.

Further, the casing has and holds the opening that the chamber communicates, and the one end of a plurality of electric cores all is located the opening, and the group battery still includes: the sealing piece is located at the opening, the sealing piece seals the area between the shell and the plurality of battery cells and the area between any two adjacent battery cells, and an exhaust port is formed in the sealing piece.

Further, the battery cell is of a cylindrical structure.

Further, the battery pack further includes: the insulating layer sets up and is holding the intracavity, and the insulating layer is a plurality of, has the insulating layer between at least two adjacent electric cores of part.

Furthermore, the battery cell is of a cylindrical structure, and the plurality of heat insulation layers are wrapped on the outer circular surface of the battery cell in a one-to-one correspondence manner; or, electric core is the cuboid structure, and the insulating layer is the flat structure, all presss from both sides between two arbitrary adjacent electric cores and is equipped with at least one deck insulating layer.

Further, the plug is a membrane, a glue valve, paraffin or a sealant.

Use the technical scheme of the utility model, be provided with the heat absorbent between two arbitrary adjacent electric cores of group battery, like this when certain electric core is overheated, the heat that the electricity core produced can be absorbed to the heat absorbent, and the outside that the gas of production can be discharged the casing takes away a large amount of heats, has avoided the diffusion of group battery thermal runaway like this to and the problem of explosion on fire. Therefore, the technical scheme can inhibit thermal runaway spread of the battery pack and improve safety.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present invention;

FIG. 2 shows an internal schematic view of FIG. 1;

FIG. 3 shows a cross-sectional view of FIG. 1;

fig. 4 is a schematic structural diagram of a battery pack according to a second embodiment of the present invention;

fig. 5 is a schematic structural diagram of a battery pack according to a third embodiment of the present invention;

FIG. 6 shows a cross-sectional view of FIG. 5;

fig. 7 shows a schematic structural diagram of a battery pack according to a fourth embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a housing; 11. a body; 12. a cover plate; 13. an exhaust port; 20. an electric core; 30. an endothermic agent; 40. a plug; 50. a seal member; 60. an insulating layer.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 to 3, a first embodiment of the present invention provides a battery pack, including: a housing 10, the housing 10 having a receiving cavity; a plurality of battery cells 20, wherein the battery cells 20 are arranged in the accommodating cavity at intervals; and the heat absorbent 30 is arranged in the accommodating cavity, the heat absorbent 30 is arranged between any two adjacent electric cores 20, the heat absorbent 30 can absorb heat to generate gas, and the gas generated by the heat absorbent 30 can be exhausted to the outside of the shell 10.

By applying the technical scheme of the embodiment, the heat absorbent 30 is arranged between any two adjacent electric cores 20 of the battery pack, so that when a certain electric core 20 is overheated, the heat absorbent 30 can absorb heat generated by the electric core 20, and generated gas can be discharged to the outside of the shell 10 to take away a large amount of heat, thereby avoiding the diffusion of thermal runaway of the battery pack and the problems of fire explosion. Therefore, the technical scheme can inhibit thermal runaway spread of the battery pack and improve safety.

In this embodiment, the accommodating cavity is a sealed structure, an exhaust port 13 communicated with the accommodating cavity is arranged between any two adjacent battery cells 20, and the exhaust port 13 is used for exhausting gas generated by the heat absorbent 30. By providing the exhaust port 13, the gas generated when the heat absorbing agent 30 absorbs heat can be exhausted through the exhaust port 13 at a specific position, so that the gas can be guided.

In this embodiment, the case 10 has an air outlet 13 communicating with the accommodation chamber, and the battery pack further includes: and a plug 40 for plugging the exhaust port 13, wherein the plug 40 can be opened under a preset pressure and/or a preset temperature. By providing the plug 40, the battery pack can have good sealing performance, and no gas can pass through the exhaust port 13 during normal use of the battery pack. When thermal runaway of the battery cell 20 occurs, the heat absorbent 30 absorbs heat to generate gas, the internal temperature of the battery pack rises, and when the temperature or the pressure of the plug 40 reaches a predetermined value, the plug 40 opens, so that the gas and a large amount of heat are discharged to the outside of the battery pack. Specifically, the plug 40 may be a membrane, a glue valve, paraffin or a sealant.

As shown in fig. 1, the casing 10 includes a body 11 and a cover plate 12, the body 11 has an opening for accommodating the cavity and communicating with the cavity, the cover plate 12 is plugged at the opening, the cover plate 12 has a plurality of avoiding openings and a plurality of exhaust ports 13, one end of each of the plurality of battery cells 20 penetrates out of the accommodating cavity from the plurality of avoiding openings in a one-to-one correspondence manner, and the exhaust ports 13 are disposed between any two adjacent avoiding openings. Sealing of the receiving chamber is facilitated by the cover plate 12. The battery cell 20 is extended out from the avoiding opening on the cover plate 12, so that the electrodes can be exposed, and the circuit can be connected conveniently. The plurality of exhaust ports 13 provided in the cover plate 12 allow high-temperature gas to be exhausted in the event of thermal runaway. In this embodiment, the housing 10 may be an integrally formed structure, or may be a separate structure formed by connecting the body 11 and the cover 12.

In this embodiment, one end of the battery cell 20 may penetrate through the avoidance port, and the other end of the battery cell 20 is enclosed in the accommodating cavity, or one end of the battery cell 20 may penetrate through the avoidance port, and the other end of the battery cell 20 may penetrate through the other surface opposite to the avoidance port. Of course, in this embodiment, in a case where the positive electrode line and the negative electrode line can be connected, both ends of the battery cell 20 may also be disposed to be located in the accommodating cavity without penetrating through the casing 10.

In the present embodiment, the battery cell 20 has a cylindrical structure. In this way, for the region between the cylindrical battery cells 20, the filling of the heat absorbent 30 is facilitated, so that the battery pack is compact in structure, low in manufacturing cost, and high in space utilization.

In the present embodiment, the endothermic agent 30 may be provided as a vaporization type endothermic agent or a decomposition type endothermic agent. Therefore, the effects of rapid heat absorption and rapid heat dissipation can be achieved, and thermal runaway of the battery pack is prevented.

As shown in fig. 4, in the second embodiment of the present invention, unlike the above embodiment, the battery pack further includes: the insulating layer 60 is arranged in the accommodating cavity, the insulating layers 60 are multiple, and the insulating layer 60 is arranged between any two adjacent electric cores 20. By providing the heat insulating layer 60, the battery cell 20 can be insulated. For example, when a thermal runaway occurs in a certain battery cell 20, the thermal runaway of an adjacent battery cell 20 caused by a large amount of heat transferred to the adjacent battery cell 20 can be avoided by the heat dissipation effect of the heat absorbent 30 and the heat insulation effect of the heat insulation layer 60. Therefore, the diffusion of thermal runaway can be avoided, and the safety of the battery pack is ensured. Specifically, the plurality of heat insulating layers 60 are wrapped on the outer circumferential surface of the battery cell 20 in a one-to-one correspondence.

As shown in fig. 5 and 6, in a third embodiment of the present invention, different from the above-mentioned embodiments, the casing 10 has an opening communicating with the accommodating cavity, one end of each of the plurality of battery cells 20 is located at the opening, and the battery pack further includes: and the sealing member 50, the sealing member 50 is located at the opening, the sealing member 50 blocks the area between the casing 10 and the plurality of battery cells 20 and the area between any two adjacent battery cells 20, and the sealing member 50 is provided with an exhaust port 13. The seal 50 ensures the tightness of the receiving space. Specifically, the battery cell 20 has a rectangular parallelepiped structure.

As shown in fig. 7, in a fourth embodiment of the present invention, different from the third embodiment, the battery pack further includes: and the heat insulation layers 60 are arranged in the accommodating cavity, the number of the heat insulation layers 60 is multiple, and the heat insulation layer 60 is arranged between at least two adjacent battery cores 20. Specifically, the heat insulating layer 60 is a flat plate structure, and at least one layer of heat insulating layer 60 is sandwiched between any two adjacent battery cells 20. By providing the heat insulating layer 60, the battery cell 20 can be insulated. For example, when a thermal runaway occurs in a certain battery cell 20, the thermal runaway of an adjacent battery cell 20 caused by a large amount of heat transferred to the adjacent battery cell 20 can be avoided by the heat dissipation effect of the heat absorbent 30 and the heat insulation effect of the heat insulation layer 60. Therefore, the diffusion of thermal runaway can be avoided, and the safety of the battery pack is ensured.

The technical scheme of the utility model can effectively reduce the emergence of group battery thermal runaway, with low costs, light in weight, space utilization height.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the 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 a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

Claims

1. A battery pack, comprising:

a housing (10), the housing (10) having a receiving cavity;

a plurality of battery cells (20), wherein the battery cells (20) are arranged in the accommodating cavity at intervals;

the heat absorbent (30) is arranged in the accommodating cavity, the heat absorbent (30) is arranged between any two adjacent battery cells (20), the heat absorbent (30) can absorb heat to generate gas, and the gas generated by the heat absorbent (30) can be exhausted to the outside of the shell (10);

the casing (10) is provided with an air outlet (13) communicated with the accommodating cavity, and the battery pack further comprises: a stopper (40) which is blocked at the exhaust opening (13), the stopper (40) being capable of opening at a predetermined pressure and/or a predetermined temperature.

2. The battery pack according to claim 1, wherein the housing (10) comprises a body (11) and a cover plate (12), the body (11) has the accommodating cavity and an opening communicated with the accommodating cavity, the cover plate (12) blocks the opening, the cover plate (12) is provided with a plurality of avoiding openings and a plurality of exhaust ports (13), one end of the battery cell (20) penetrates out of the accommodating cavity from the avoiding openings in a one-to-one correspondence manner, and the exhaust ports (13) are arranged between any two adjacent avoiding openings.

3. The battery pack according to claim 1, wherein the case (10) has an opening communicating with the accommodation chamber, and one end of each of the plurality of battery cells (20) is located at the opening, the battery pack further comprising:

a sealing member (50), wherein the sealing member (50) is located at the opening, the sealing member (50) blocks the area between the shell (10) and the plurality of battery cells (20) and the area between any two adjacent battery cells (20), and the sealing member (50) is provided with an air outlet (13).

4. The battery pack of claim 1, wherein the cells (20) are of cylindrical configuration.

5. The battery pack of claim 1, further comprising:

the heat insulation layers (60) are arranged in the accommodating cavity, the heat insulation layers (60) are multiple, and the heat insulation layers (60) are arranged between at least two adjacent battery cores (20).

6. The battery pack according to claim 5,

the battery core (20) is of a cylindrical structure, and the plurality of heat insulation layers (60) are wrapped on the outer circular surface of the battery core (20) in a one-to-one correspondence manner; or the like, or, alternatively,

the battery cell (20) is of a cuboid structure, the heat insulation layer (60) is of a flat plate structure, and at least one layer of the heat insulation layer (60) is arranged between any two adjacent battery cells (20).

7. The battery according to claim 1, characterized in that the plug (40) is a membrane, a glue valve, a paraffin or a sealant.