CN210535785U

CN210535785U - Lithium battery pack with low-temperature heating structure

Info

Publication number: CN210535785U
Application number: CN201921411802.6U
Authority: CN
Inventors: 张颖建; 孙永
Original assignee: Shenzhen No7 Network Technology Co Ltd
Current assignee: Shenzhen No7 Network Technology Co Ltd
Priority date: 2019-08-28
Filing date: 2019-08-28
Publication date: 2020-05-15
Anticipated expiration: 2029-08-28

Abstract

The utility model belongs to the technical field of lithium battery packs, and provides a lithium battery pack with a low-temperature heating structure, which comprises a shell, a battery module and a heating film belt, wherein the heating film belt is coiled in a snake shape in sequence to form a battery module consisting of single batteries in rows or rows; the air guide pipe is fixed on the outer side of the battery module in a surrounding manner, pipe orifices at two ends are respectively communicated with air supply surfaces of the two heating fans, and a plurality of air outlet holes are formed in the pipe body at equal intervals; the heat preservation laminating is fixed in the shell inner wall. The utility model transmits the heat generated by the heating film belt to the contacted single batteries; heating air by the heating fan is sent into the air guide pipe and then sent into the outer side of the battery module through the air outlet hole to be heated comprehensively; and the lithium battery pack is insulated through the insulating layer, so that the battery module can keep a temperature capable of normally discharging in a low-temperature environment. Simple structure, rapid heating of the battery and uniform temperature.

Description

Lithium battery pack with low-temperature heating structure

[ technical field ] A method for producing a semiconductor device

The utility model relates to a lithium cell group technical field especially relates to a lithium cell group with low temperature heating structure.

[ background of the invention ]

Currently, lithium battery packs are widely used in various fields because of their portability and excellent discharge performance. However, there are many fields and situations where lithium batteries need to be installed outdoors or in cold regions for a long time, however, at low temperatures, the performance of lithium batteries is particularly degraded: the dischargeable electric quantity in-10 ℃ environment is only 60% of the rated electric quantity, the dischargeable electric quantity in-20 ℃ environment is only 30% of the rated electric quantity at most, and the discharge of the lithium battery in-20 ℃ environment has huge potential safety hazard, thus seriously affecting the operation and use of the machine equipment. And the high-latitude or high-altitude area is in a low-temperature state for a long time, the lowest temperature can reach-50 ℃, and the area is often inconvenient to erect and maintain power transmission equipment, so that the development of the portable lithium battery pack capable of being used in the low-temperature environment has great application and practical significance. In addition, in some technical schemes that can heat the lithium battery, the heating is not uniform enough, which easily causes the service life of the battery pack to be greatly reduced.

In view of the above, it is desirable to develop a new lithium battery pack for low temperature environment to improve the above-mentioned technical problems of the lithium battery pack with reduced discharge performance and insufficient temperature uniformity in low and medium temperature environment.

[ Utility model ] content

In order to improve among the low temperature environment lithium cell group discharge performance weaken and the not even technical problem enough of temperature, the utility model provides a lithium cell group with low temperature heating structure, including the battery module that shell and a plurality of the same battery cell constitute, still include: the heating film belt is coiled in a snake shape and sequentially passes through the battery modules formed by the single batteries in rows or rows; the air guide pipes are fixed on the outer side of the battery module in a surrounding manner, pipe orifices at two ends are respectively communicated with the air supply surfaces of the two heating fans, and a plurality of air outlet holes are formed in the pipe bodies at equal intervals; the heating fan is fixed on the inner wall of the shell; and the heat preservation layer is attached and fixed on the inner wall of the shell.

In a preferred embodiment, the battery module further comprises a temperature control element connected in series with the heating film belt and a power supply circuit of the heating fan, and used for measuring the temperature of the battery module.

In a preferred embodiment, the top and the bottom of the battery module are fixed to an upper fixing plate and a lower fixing plate, respectively; the upper fixing plate and the lower fixing plate are made of heat-conducting plastic.

In a preferred embodiment, a fuse is provided in the output circuit of the battery module.

In a preferred embodiment, the insulation consists essentially of aerogel.

In a preferred embodiment, a total electrode of the battery module is connected in series with a KSD over-temperature protector, and the KSD over-temperature protector is fixed on the battery module.

In a preferred embodiment, the heating film belt and the heating fan are electrically connected with an internal or external power supply through a protection circuit board.

The utility model transmits the heat generated by the heating film belt to the contacted single batteries; heating air by the heating fan is sent into the air guide pipe and then sent into the outer side of the battery module through the air outlet hole to be heated comprehensively; and the lithium battery pack is insulated through the insulating layer, so that the battery module can keep a temperature capable of normally discharging in a low-temperature environment. The utility model discloses simple structure, it is even to battery heating rapidly and temperature.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic top view of a cross-sectional structure of a battery module in a lithium battery pack according to an embodiment of the present invention;

fig. 2 is a schematic view of an internal three-dimensional structure of a lithium battery pack according to an embodiment of the present invention;

fig. 3 is a schematic view of a top-view cross-sectional structure of a lithium battery pack according to an embodiment of the present invention.

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantageous technical effects of the present invention more clearly apparent, the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings of the embodiments of the present invention, and obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

In order to improve the technical problem that the discharge performance of the lithium battery pack weakens and the temperature is not uniform enough in the low temperature environment, see fig. 1-3, the utility model provides a lithium battery pack with low temperature heating structure, including the battery module 100 that shell 1 and a plurality of the same battery cell 10 constitute, still include: the heating film belt 2 is coiled in a snake shape and sequentially passes through the battery module 100 formed by the single batteries 10 in rows or rows; the gas guide pipe 3 is fixed on the outer side of the battery module 100 in a surrounding manner, pipe openings at two ends are respectively communicated with gas supply surfaces of the two heating fans 4, and a plurality of gas outlet holes 30 are formed in the pipe body at equal intervals; the heating fan 4 is fixed on the inner wall of the shell 1; and the heat preservation layer 5 is attached to and fixed on the inner wall of the shell 1.

First, as shown in fig. 2, the heat generating film tape 2 is wound around all the unit cells 10 so as to have as large a contact area as possible, and the heat generated by the heat generating film tape 2 is transferred to the battery module 100 as quickly as possible.

Secondly, in the outermost single battery 10 of the battery module 100, heat is easily dissipated through the housing 1, or the heating contact area is small due to the winding of the heating film tape 2, so that the temperature of the outermost single battery 10 is lower than that of the inner battery. The long-term temperature unevenness can cause different aging degrees of the single batteries 10 in the same battery module 100, thereby accelerating the problem of deterioration of the consistency of the battery pack and leading the service life of the battery pack to be more attenuated. In conclusion, the heating fan 4 heats air to send hot air into the air duct 3, and then the single batteries 10 at the outermost side are heated through the air outlet holes 30 in the air duct 3, so that the heating is uniform. In addition, the flow of air inside the battery also equalizes the temperature of each unit battery 10, thereby alleviating the problem of deterioration in uniformity of the battery module 100. The air supply surface of the heating fan 4 refers to a surface of the fan which supplies air, that is, a front surface of the fan.

Finally, a layer of heat preservation layer 5 is arranged on the inner wall of the shell 1, so that the heat of the battery module 100 can be reduced to be dissipated outwards, and the consumption of the heating film belt 2 is correspondingly reduced.

Specifically, referring to fig. 2 to 3, the temperature control device 6 is connected in series with the heating film strip 2 and the power supply circuit of the heating fan 4, and is used for measuring the temperature of the battery module 100.

Wherein, because there is the possibility that the use scene changes, lead to the temperature of battery module 100 to be heated and has exceeded the suitable service temperature scope of battery, temperature control element 6 can monitor the temperature of battery module 100, when detecting that the temperature of battery module 100 exceeds preset threshold value, outwards sends out the police dispatch newspaper or even directly controls the membrane area 2 that generates heat and heating fan 4 disconnection circuit and is connected, thereby prevents that battery module 100 from being heated and too high temperature produces the risk.

Further, referring to fig. 2, the top and bottom of the battery module 100 are fixed to the upper fixing plate 7 and the lower fixing plate 8, respectively; the upper fixing plate 7 and the lower fixing plate 8 are both made of heat-conducting plastic.

Wherein, the upper fixing plate 7 and the lower fixing plate 8 have two functions: firstly arrange the monomer battery 10 in battery module 100 fixedly, prevent the collision and provide the buffering, secondly carry out the temperature equilibrium to anodal or negative pole part in whole battery module 100, avoid because the uneven uniformity deterioration problem that leads to of temperature.

Particularly, referring to fig. 2 and 3, the fuse 9 is disposed in the output circuit of the battery module 100, which mainly prevents the problem that the device is damaged by excessive current caused by local short circuit generated by heating inside the battery module 100. When the fuse 9 is flowed by an excessive current, the internal fuse will automatically blow to open the circuit.

Still further, referring to fig. 3, the insulation layer 5 is mainly composed of aerogel.

Generally, the thickness of the adopted aerogel is 5-10mm, the aerogel is composed of silicon dioxide aerogel and glass fibers and comprises six surfaces, and the battery module 100 and the circuit system are wrapped in the aerogel, so that heat loss can be effectively avoided.

Specifically, referring to fig. 3, a total electrode of the battery module is connected in series with a KSD over-temperature protector 11, and the KSD over-temperature protector 11 is fixed to the battery module 100.

It should be noted that the KSD over-temperature protector 11 is a closed temperature controller developed by using thermal bimetal, and has the characteristics of rapid action, accurate temperature control, large control current and long service life. The principle is as follows: the elastic element with environment-friendly silver contact is connected to the bottom plate, the bottom plate and the spring piece are provided with the bimetallic discs of the temperature sensing device and are embedded into the shell, heat is transferred to the bimetallic discs, the bimetallic discs act instantly when the specified value of the bimetallic discs is reached, the circuit is cut off, and when the temperature drops to the reset temperature, the bimetallic discs close rapidly to switch on the circuit again.

When the temperature of the battery module 100 exceeds the preset threshold value, the KSD over-temperature protector 11 can disconnect the circuit of the battery module 100, thereby protecting the normal use of the battery module 100.

Particularly, the heating film belt 2 and the heating fan 4 are electrically connected with an internal or external power supply through a protection circuit board. Generally, the battery module 100 is directly used as a power source.

The utility model transmits the heat generated by the heating film belt 2 to the contacted single battery 10; the air is heated by the heating fan 4 and sent into the air guide tube 3, and then sent into the outer side of the battery module 100 through the air outlet hole 30 to be heated comprehensively; and the lithium battery pack is insulated by the insulating layer 5, so that the battery module 100 can keep a normal discharging temperature in a low-temperature environment. The utility model discloses simple structure, it is even to battery heating rapidly and temperature.

The invention is not limited solely to that described in the specification and the embodiments, and additional advantages and modifications will readily occur to those skilled in the art, and it is not intended to be limited to the specific details, representative apparatus, and illustrative examples shown and described herein, without departing from the spirit and scope of the general concept as defined by the appended claims and their equivalents.

Claims

1. The utility model provides a lithium cell group with low temperature heating structure, includes the battery module that shell and a plurality of the same battery cell are constituteed, its characterized in that still includes:

the heating film belt is coiled in a snake shape and sequentially passes through the battery modules formed by the single batteries in rows or rows;

the air guide pipes are fixed on the outer side of the battery module in a surrounding manner, pipe orifices at two ends are respectively communicated with the air supply surfaces of the two heating fans, and a plurality of air outlet holes are formed in the pipe bodies at equal intervals; the heating fan is fixed on the inner wall of the shell;

and the heat preservation layer is attached and fixed on the inner wall of the shell.

2. The lithium battery pack with a low-temperature heating structure according to claim 1, further comprising a temperature control element connected in series with the heat-generating film tape and a power supply circuit of the heating blower for measuring a temperature of the battery module.

3. The lithium battery pack having a low-temperature heating structure according to claim 1, wherein the top and the bottom of the battery module are fixed to an upper fixing plate and a lower fixing plate, respectively; the upper fixing plate and the lower fixing plate are made of heat-conducting plastic.

4. The lithium battery pack having a low-temperature heating structure according to claim 1, wherein a fuse is provided in an output circuit of the battery module.

5. The lithium battery pack having a low-temperature heating structure according to claim 1, wherein the insulating layer is mainly composed of aerogel.

6. The lithium battery pack with the low-temperature heating structure as claimed in claim 1, wherein a total electrode of the battery module is connected in series with a KSD over-temperature protector, and the KSD over-temperature protector is fixed on the battery module.

7. The lithium battery pack with a low-temperature heating structure as claimed in claim 1, wherein the heating film strip and the heating fan are electrically connected with an internal or external power supply through a protection circuit board.