CN216161809U

CN216161809U - Heatable lithium battery pack shell

Info

Publication number: CN216161809U
Application number: CN202122068097.8U
Authority: CN
Inventors: 高建芳
Original assignee: Hangzhou Dongjian Energy Technology Co ltd
Current assignee: Hangzhou Dongjian Energy Technology Co ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-04-01
Anticipated expiration: 2031-08-31

Abstract

The utility model provides a heatable lithium battery pack shell which comprises a shell, an upper cover fixedly connected to the shell and a handle arranged at the top of the upper cover, wherein a charging interface and a discharging interface are arranged on the shell, heating devices are arranged on the inner walls of the upper cover and the shell, a temperature control switch for controlling the heating devices is arranged on the upper cover, one end of the temperature control switch is connected with a lithium battery pack for supplying power, three grooves which are sunken downwards are annularly arranged at the opening end of the shell, each groove comprises a water storage groove positioned in the middle and sealing grooves positioned on the inner side and the outer side of the water storage groove, sealing rings which are partially protruded upwards are arranged in the sealing grooves, and the depth of the water storage groove is greater than that of the sealing grooves. The problem that can't normally charge under the lithium cell low temperature environment, discharge and the infiltration can be solved, the low temperature performance of lithium cell group greatly improves, and the space that occupies is very little, low in production cost, and sealed effectual, long service life.

Description

Heatable lithium battery pack shell

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a heatable lithium battery pack shell.

Background

A lithium ion battery is currently the most widely used secondary battery, and has many advantages such as high energy density, low self-discharge rate, high potential difference, and long cycle life. The cycle life is more than 2000 times. Under the same conditions, the lithium battery can be used for 7 to 8 years, and is safe to use. The lithium battery is subjected to strict safety test, and cannot explode even in traffic accidents; the lithium battery is high in temperature resistance, and the hot air value of the lithium battery can reach 350-500 ℃; the lithium battery has the advantages of large capacity, no memory effect, environmental protection, no toxicity, no pollution, wide raw material source and low price. However, the lithium battery generally has poor low-temperature charging and discharging performance, and the battery has great limitation if the battery needs to be used at the temperature of minus 20 ℃ or even lower ambient temperature. Through research on the lithium ion battery, the degree of improving low-temperature charging and discharging is limited in the aspects of adopting low-temperature electrolyte, improving a battery core structure, adjusting a battery core process formula and the like in the traditional method, the low-temperature charging performance of the battery cannot be greatly improved under the state of the temperature below 0 ℃, the normal charging and discharging of the lithium battery pack can be realized only when the temperature in a battery pack shell reaches above 5 ℃, and meanwhile, because the ice and snow are generally accompanied in the low-temperature environment when the lithium battery pack is used outdoors, the ice and snow on the shell are easily melted after the shell is heated to above 0 ℃, and the sealing performance of the lithium battery pack also needs to be ensured.

Disclosure of Invention

In order to solve certain or some technical problems in the prior art, the utility model provides the heatable lithium battery pack shell which can solve the problems that the lithium battery cannot be normally charged, discharged and seeped in the low-temperature environment, greatly improves the low-temperature performance of the lithium battery pack, occupies small space, is low in production cost, and has good sealing effect and long service life.

In order to solve the above-mentioned existing technical problem, the utility model adopts the following scheme:

the utility model provides a lithium cell group shell can heat, includes casing, fixed connection upper cover on the casing, establish the handle at upper cover top, be provided with on the casing and fill, the interface that discharges, be equipped with heating device on the inner wall of upper cover and casing, it is right to cover on, heating device carries out the temperature control switch that controls, the one end and the lithium cell group of temperature control switch are connected the power supply, the open end ring of casing is equipped with three recesses of undercut, the recess is including being located middle aqua storage tank, being located the seal groove of the inside and outside both sides of aqua storage tank, be equipped with the bellied sealing ring that makes progress of part in the seal groove, the degree of depth of aqua storage tank is greater than the degree of depth of seal groove.

Further, the heating device comprises a positioning groove formed in the inner side of the shell and the upper cover and a heating wire arranged in the positioning groove, and the heating wire is fixed in the shell and the upper cover through the positioning groove.

Furthermore, a layer of flexible heating film is arranged on the inner sides of the shell and the upper cover, the thickness of the heating wire is 2mm-3mm, and the temperature adjustable range of the heating wire is-30 ℃ to 100 ℃.

Furthermore, a plurality of buckles are arranged in the positioning groove at intervals, and the heating wires are limited and fixed through the buckles.

Further, the buckle is including establishing the body and the lower body of detaining of going up of constant head tank opening part, it all adopts the protruding structure of arc to detain the body and detain the body down to go up, the opening of constant head tank passes through the buckle forms the local structure that reduces of discontinuity.

Further, two adjacent distance between the buckle is 5-7cm, the heater strip is indisputable chromium aluminium, nickel chromium electrothermal alloy, flexible heating film is one of silica gel heating tape, PET heating film or the glass fibre heating tape.

Furthermore, the charging and discharging interface adopts an Anderson plug hole, and a sealing ring for dust prevention and water prevention is arranged on the charging and discharging interface.

Compared with the prior art, the utility model has the beneficial effects that:

the charging and discharging ambient temperature of the lithium battery pack placed in the shell can be increased to 5 ℃, the lithium battery pack can be applied to equipment needing outdoor charging and discharging, the lithium battery pack placed in the shell can be easily charged and discharged under the condition of low external temperature, and the low-temperature performance of the lithium battery pack is greatly improved; heating device installs on the inner wall of casing and upper cover, and its thickness is very thin, and the space that occupies is very little, and the effectual lithium cell group that has solved can't normally charge, the problem of discharging under low temperature environment, has greatly improved the low temperature performance of lithium cell group, low in production cost, long service life.

Two, the upper end of casing has formed aqua storage tank and double seal's seal groove structure through three recesses, can seal through the sealing ring that compresses tightly between casing and the upper cover, when the sealing ring in the outside appears ageing infiltration, the moisture that the infiltration got into can be saved through the aqua storage tank, avoid directly flowing into in the casing, and also can be quick when overhauing judge the sealing ring whether need change already, effectually avoided the casing because of sealed effect poor lead to the infiltration and can't in time discover the problem of sealed effect.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of a portion of the present invention;

in the figure: the device comprises a shell 1, a sealing ring 2, a charging and discharging interface 3, a groove 4, a positioning groove 5, a handle 6, an upper cover 7, a water storage tank 8, a sealing ring 9, a sealing groove 10, a temperature control switch 11, a heating device 12, a heating wire 13, a flexible heating film 14, a lower buckle body 15, an upper buckle body 16 and a buckle 17.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

As shown in fig. 1-2, a lithium cell group shell can heat, including casing 1, fixed connection upper cover 7 on the casing 1, establish handle 6 at upper cover 7 top, be provided with on the casing 1 and fill, discharge interface 3, be equipped with heating device 12 on the inner wall of upper cover 7 and casing 1, it is right to be equipped with on upper cover 7 heating device 12 carries out the temperature control switch 11 that controls, temperature control switch 11's one end and lithium cell group are connected the power supply, the open end ring of casing 1 is equipped with three undercut's recess 4, recess 4 is including being located middle aqua storage tank 8, being located the seal groove 10 of the inside and outside both sides of aqua storage tank 8, be equipped with the bellied sealing ring 9 that makes progress in the seal groove 10, the degree of depth of aqua storage tank 8 is greater than the degree of depth of seal groove 10.

In the actual use process, the lithium battery is arranged in the shell 1 and sealed by the upper cover 7, the heating device 12 is communicated with the lithium battery through the temperature control switch 11 and supplies power through the lithium battery pack, the heating temperature of the heating device 12 is adjusted through the temperature control switch 11, the charging and discharging ambient temperature of the lithium battery pack placed in the shell 1 can be increased to 5 ℃, the outdoor charging and discharging equipment can be needed, the lithium battery pack placed in the shell can be easily charged and discharged under the condition of low external temperature, and the low-temperature performance of the lithium battery pack is greatly improved; heating device 12 installs on the inner wall of casing 1 and upper cover 7, and its thickness is very thin, and the space that occupies is very little, and the effectual lithium cell group that has solved can't normally charge, the problem of discharging under low temperature environment, has greatly improved the low temperature performance of lithium cell group, low in production cost, long service life. When the upper cover 7 is arranged on the shell 1, the upper cover 7 and the shell 1 are pressed and sealed through the sealing ring 9, because the sealing ring 9 and the sealing groove 10 adopt a double structure, the sealing effect is better, meanwhile, a water storage groove 8 with deeper depth is also arranged between the two sealing grooves 10, the water permeating from the outside can be effectively stored, the water can be prevented from entering the inside of the shell 1, the upper end of the shell 1 forms the structure of the water storage groove 8 and the double sealing groove 10 through the three grooves 4, the shell 1 and the upper cover 7 can be sealed through the compressed sealing ring 9, when the sealing ring 9 on the outer side is aged and seeps water, the water which permeates into the sealing ring can be stored through the water storage tank 8, and is prevented from directly flowing into the shell 1, and also can be quick when overhauing whether judgement sealing ring 9 has need to be changed, effectual casing 1 of having avoided because of sealed effect is poor leads to the infiltration and can't in time discover the problem of sealed effect.

In a further improvement, the heating device 12 comprises a positioning groove 5 arranged inside the casing 1 and the upper cover 7, and a heating wire 13 arranged in the positioning groove 5, wherein the heating wire 13 is fixed in the casing 1 and the upper cover 7 through the positioning groove 5.

Heating device 12 comprises heater strip 13 and constant head tank 5, can make the heater strip 13 embedding fix on casing 1 and upper cover 7 through constant head tank 5 to make the mounted position of heater strip 13 more accurate, installation back stability is better, the bellied phenomenon to casing 1 inside can not appear.

The further improvement is that a layer of flexible heating film 14 is arranged on the inner sides of the shell 1 and the upper cover 7, the thickness of the heating wire 13 is 2mm-3mm, and the temperature adjustable range of the heating wire 13 is-30 ℃ to 100 ℃; two adjacent distance between buckle 17 is 5-7cm, heater strip 13 is iron chromium aluminium, nickel chromium electrothermal alloy, flexible heating film 14 is one of silica gel heating tape, PET heating film or the glass fibre heating tape.

The heating wire 13 is made of iron-chromium-aluminum and nickel-chromium electrothermal alloy with the thickness of 2-3mm, the heating effect is better, the temperature adjustable range of the heating wire 13 is-30-100 ℃, the lithium battery can reach 5 ℃ after being heated in a low-temperature environment, so that the lithium battery pack has an effective charging and discharging environment, after the shell 1 and the inner side of the upper cover 7 are covered by the flexible heating film 14, the heating temperature in the shell 1 can be more uniform, the flexible heating film 14 is a silica gel heating belt, one of a PET heating film or a glass fiber heating belt, different materials and coverage ranges can be selected according to different environments, and the flexibility is higher.

The improved structure is characterized in that a plurality of buckles 17 are arranged in the positioning groove 5 at intervals, and the heating wire 13 is limited and fixed through the buckles 17; the buckle 17 comprises an upper buckle body 16 and a lower buckle body 15 which are arranged at the opening of the positioning groove 5, the upper buckle body 16 and the lower buckle body 15 both adopt arc-shaped protruding structures, and the opening of the positioning groove 5 forms a discontinuous local reduction structure through the buckle 17; the distance between two adjacent buckles 17 is 5-7 cm.

The constant head tank 5 generally adopts square or arc recess 4, processing is more convenient, because the open end of constant head tank 5 is for simple to operate, generally adopt the minimum thickness that highly is greater than heater strip 13, to avoid heater strip 13 installation back to protruding to me, a plurality of bellied buckles 17 have been formed at the opening part of constant head tank 5, buckle 17 again the inside bellied body 16 of detaining of the last knot of arc is buckled with body 15 down and is constituteed, distance between two adjacent buckles 17 is 5-7cm, the opening of constant head tank 5 forms the local structure of dwindling of discontinuity through buckle 17, can make the effectual setting of heater strip 13 in constant head tank 5 through buckle 17, the effectual heater strip 13 of having placed appears falling out the phenomenon.

The improved structure is characterized in that the charging and discharging interface 3 adopts an Anderson plug hole, and a dustproof and waterproof sealing ring 2 is arranged on the charging and discharging interface 3; the charging and discharging wires of the battery pack are connected with the Anderson plug connectors and are fixed on the Anderson plug holes; the material of casing 1 can be panel beating or stainless steel, and the thickness of heater strip 13 is 2 mm's nickel chromium electric heat alloy, and the area occupies 1/2 of casing 1 internal surface, and the power direct access lithium cell group of heater strip 13, and temperature control switch 11 turn-off node temperature is 5 ℃, and when ambient temperature is less than 5 ℃, heater strip 13 begins working, makes the temperature of casing 1 keep at temperature control switch 11's settlement temperature.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. The utility model provides a lithium cell group shell can heat, includes casing, fixed connection upper cover on the casing, establish the handle at upper cover top, be provided with on the casing and fill, discharge interface, its characterized in that: be equipped with heating device on the inner wall of upper cover and casing, it is right to cover on the upper cover temperature control switch that heating device carries out control, temperature control switch's one end and lithium cell group are connected the power supply, the open end ring of casing is equipped with three recesses of undercut, the recess is including being located the aqua storage tank in the middle of, being located the seal groove of the inside and outside both sides of aqua storage tank, be equipped with the bellied sealing ring that makes progress in the seal groove, the degree of depth of aqua storage tank is greater than the degree of depth of seal groove.

2. A lithium battery pack casing as claimed in claim 1, wherein: the heating device comprises a positioning groove formed in the shell and the inner side of the upper cover and a heating wire arranged in the positioning groove, and the heating wire is fixed in the shell and the upper cover through the positioning groove.

3. A lithium battery pack casing as claimed in claim 2, wherein: the inner sides of the shell and the upper cover are both provided with a layer of flexible heating film, the thickness of the heating wire is 2mm-3mm, and the temperature adjustable range of the heating wire is-30 ℃ to 100 ℃.

4. A heatable lithium battery pack housing according to claim 3, characterized in that: a plurality of buckles are arranged in the positioning groove at intervals, and the heating wires are limited and fixed through the buckles.

5. A heatable lithium battery pack housing according to claim 4, wherein: the buckle is including establishing the body and the lower body of detaining of going up of constant head tank opening part, it all adopts the protruding structure of arc to detain the body and detain the body down to go up to detain the body, the opening of constant head tank passes through the buckle forms the local structure of reducing of discontinuity.

6. A heatable lithium battery pack housing according to claim 5, wherein: two adjacent distance between the buckle is 5-7cm, the heater strip is indisputable chromium aluminium, nickel-chromium electrothermal alloy, flexible heating film is one of silica gel heating tape, PET heating film or the glass fibre heating tape.

7. A lithium battery pack casing as claimed in claim 1, wherein: the charging and discharging interface adopts an Anderson plug hole, and a sealing ring for dust prevention and water prevention is arranged on the charging and discharging interface.