CN216850085U - Novel structure of lithium ion battery for low-temperature environment - Google Patents
Novel structure of lithium ion battery for low-temperature environment Download PDFInfo
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- CN216850085U CN216850085U CN202123061181.3U CN202123061181U CN216850085U CN 216850085 U CN216850085 U CN 216850085U CN 202123061181 U CN202123061181 U CN 202123061181U CN 216850085 U CN216850085 U CN 216850085U
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Abstract
The utility model belongs to the technical field of lithium ion battery structure, especially, relate to a novel structure of lithium ion battery that can be used to low temperature environment. The lithium battery comprises a negative electrode shell, wherein a positive electrode, an insulating pad and a battery cell are arranged on the inner side of the negative electrode shell, and a heat-insulating shell is arranged on the outer side of the negative electrode shell; the negative electrode shell is of a cylindrical structure with an opening at the upper end, the battery cell is positioned at the center of the inner side of the negative electrode shell, and a connecting lug is arranged between the bottom of the battery cell and the negative electrode shell; the positive electrode is positioned above the battery cell and is connected with the battery cell through another connecting tab; the insulating pad is in a circular ring shape, the inner side of the insulating pad is contacted with the anode, and the outer side of the insulating pad is contacted with the cathode shell; the cathode shell is positioned in the cylindrical heat-insulating shell; be equipped with between the bottom of heat preservation shell and the negative pole shell and be connected and lead electrical pillar, it has the aerogel of certain thickness to seal between heat preservation shell and the negative pole shell. The structure can simply improve the service performance of the lithium ion battery in a low-temperature environment on the basis of not changing the battery components, and the effect is obvious.
Description
Technical Field
The utility model belongs to the technical field of lithium ion battery structure, especially, relate to a novel structure of lithium ion battery that can be used to low temperature environment.
Background
At present, the domestic electric automobile industry rises unprecedentedly, and the consumption of electronic products is continuously enlarged, so that the demand on lithium ion batteries is increasingly increased. Originally, lithium ion batteries attracted the attention of a large number of scientists because of their advantages of excellent charge and discharge performance, high specific energy, excellent cycle performance, environmental friendliness, affordable cost, and the like. With the research on lithium ion batteries becoming more and more intensive, it is found that one of the main disadvantages of lithium ion batteries is poor low-temperature performance, which is one of the main reasons why lithium ion batteries have been limited in application for many years. Researches show that main factors influencing the low-temperature performance of the lithium ion battery include the conductivity of an electrolyte, the crystal size of an active material, interface impedance, an SEI film and the like. Especially when the characteristic crystal size of the positive electrode material is large, lithium ions do not have enough time to migrate, and this phenomenon is more remarkable particularly at low temperatures. Therefore, the main means for improving the low-temperature performance in the past is to reduce the grain size of the anode and cathode materials. There are other methods to improve the low temperature performance of lithium ion batteries, such as improving the conductivity of the active material, optimizing the electrolyte composition, improving the composition of the negative electrode SEI film, etc. These methods all improve the low temperature performance of the battery by improving the performance of each component of the lithium ion battery. However, these methods have certain limitations. The following is stated:
1. poor low-temperature performance of lithium ion batteries is caused by the combined action of various influencing factors, and the low-temperature performance of the batteries is difficult to be greatly improved by simply improving one battery component or reducing the size of crystal grains.
2. The low-temperature performance of the lithium ion battery is improved by improving the battery components, and the low-temperature performance is possibly improved while other performances of the battery are influenced.
3. The above methods may result in more complicated material preparation and even increase the cost of the battery in actual production.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a novel structure of lithium ion battery that can be used to low temperature environment can be on the basis that does not change battery pack comparatively simple improvement the performance of lithium ion battery in low temperature environment, and the effect is obvious.
In order to achieve the above purpose, the technical solution of the present invention is as follows:
a novel structure of a lithium ion battery applicable to a low-temperature environment comprises a negative electrode shell, wherein the inner side of the negative electrode shell is provided with a positive electrode, an insulating pad and a battery cell, and the outer side of the negative electrode shell is provided with a heat-insulating shell;
the negative electrode shell is of a cylindrical structure with an opening at the upper end, the battery cell is positioned at the center of the inner side of the negative electrode shell, and a connecting lug is arranged between the bottom of the battery cell and the negative electrode shell;
the positive electrode is positioned above the battery cell and is connected with the battery cell through another connecting tab;
the insulating pad is annular, the inner side of the insulating pad is in contact with the anode, and the outer side of the insulating pad is in contact with the cathode shell;
the cathode shell is positioned in the cylindrical heat-insulating shell; be equipped with between the bottom of heat preservation shell and the negative pole shell and be connected and lead electrical pillar, it has the aerogel of certain thickness to seal between heat preservation shell and the negative pole shell.
Further, the filling thickness of the aerogel is 1-2 mm.
Further, the aerogel is mesoporous silica type aerogel.
Furthermore, the material of the heat-insulating shell is nickel-plated steel or stainless steel.
Furthermore, a sealing plate is welded between the top of the heat-insulating shell and the negative electrode shell, so that a closed space is formed among the heat-insulating shell, the sealing plate and the negative electrode shell, and aerogel is filled in the space.
Compared with the prior art, the utility model discloses following beneficial effect has:
because the utility model discloses a lithium ion battery has adopted novel structure, compares with prior art, simple effectual performance that improves lithium ion battery under low temperature environment. Has the advantages of simple structure, low cost, obvious effect, strong practicability, mass production and the like. Simultaneously, the packing of aerogel has some other positive effects, and specific positive effect is as follows:
1. the aerogel has good heat insulation effect, and can be used together with a heat insulation shell to ensure that the lithium ion battery can be normally used in a low-temperature environment;
2. the aerogel is low in density and light in weight, and the overall quality of the battery is not greatly influenced after the heat-insulating outer casing is added;
3. aerogel itself is firm durable, and the heat preservation shell can play the effect of further protection electricity core.
Drawings
FIG. 1 is the overall structure schematic diagram of the cylindrical lithium ion battery of the present invention
Fig. 2 is the overall structure schematic diagram of the low-temperature lithium ion battery structure of the utility model.
In fig. 1, 1-positive pole, 2-insulating pad, 3-negative pole housing, 4-cell, 5-connection tab, 6-cylindrical battery, 7-aerogel, 8-insulating housing, 9-connection conductive post.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
example (b):
as shown in figures 1 to 2:
the utility model provides a novel structure of a lithium ion battery which can be used in low temperature environment, comprising a negative electrode shell 3, wherein the inner side of the negative electrode shell 3 is provided with a positive electrode 1, an insulating pad 2 and an electric core 4, and the outer side of the negative electrode shell 3 is provided with a heat preservation shell 8;
the negative electrode shell 3 is of a cylindrical structure with an opening at the upper end, the battery cell 4 is positioned at the center of the inner side of the negative electrode shell 3, and a connecting tab 5 is arranged between the bottom of the battery cell 4 and the negative electrode shell 3; the positive electrode 1 is positioned above the battery cell 4, and the two are connected through another connecting tab 5; the insulating pad 2 is annular, the inner side of the insulating pad 2 is in contact with the anode 1, and the outer side of the insulating pad 2 is in contact with the cathode shell 3;
the cathode shell 3 is positioned in a cylindrical heat-preservation shell 8; a connecting conductive column 9 is arranged between the bottom of the heat-insulating shell 8 and the negative electrode shell 3, and a sealing plate is welded between the top of the heat-insulating shell 8 and the negative electrode shell 3, so that a closed space is formed among the heat-insulating shell 8, the sealing plate and the negative electrode shell 3, and aerogel 7 with high heat insulation and low heat conductivity is filled in the space; aerogel 7 is a solid-like material formed by removing most of the solvent from the gel, making the liquid content of the gel much less than the solid content, and filling the space network of the gel with gas. Aerogel 7 is a very light, but very strong and durable solid with the least dense solid. Most importantly, aerogel 7 is an excellent thermal insulation material, the thermal conductivity of the aerogel 7 is only 0.02W/m.K, and 1cm of aerogel 7 can achieve the thermal insulation effect equivalent to 20-30 pieces of common glass. Specifically, the filling thickness of the aerogel 7 is 1-2mm, preferably, the mesoporous silica aerogel 7 is adopted, and the thickness of 1-2mm can well resist low temperature, so that the normal use of the lithium ion battery in a low-temperature environment, even an ultralow-temperature environment (below 40 ℃) can be ensured. The heat-insulating shell 8 is preferably made of nickel-plated steel or stainless steel, so that heat can be insulated, and the battery core 4 can be protected.
The utility model discloses can solve the problem of use of lithium ion battery under low temperature environment well, have simple structure, it is with low costs, the effect is obvious, and the practicality is strong, but advantages such as mass production.
Utilize technical scheme, or technical staff in the field be in the utility model technical scheme's inspiration, design similar technical scheme, and reach above-mentioned technological effect, all fall into the utility model discloses a protection scope.
Claims (5)
1. The utility model provides a lithium ion battery novel structure that can be used to low temperature environment which characterized in that: the lithium battery comprises a negative electrode shell, wherein a positive electrode, an insulating pad and a battery cell are arranged on the inner side of the negative electrode shell, and a heat-insulating shell is arranged on the outer side of the negative electrode shell;
the negative electrode shell is of a cylindrical structure with an opening at the upper end, the battery cell is positioned at the center of the inner side of the negative electrode shell, and a connecting lug is arranged between the bottom of the battery cell and the negative electrode shell;
the positive electrode is positioned above the battery cell and is connected with the battery cell through another connecting tab;
the insulating pad is annular, the inner side of the insulating pad is in contact with the anode, and the outer side of the insulating pad is in contact with the cathode shell;
the cathode shell is positioned in the cylindrical heat-insulating shell; be equipped with between the bottom of heat preservation shell and the negative pole shell and be connected and lead electrical pillar, it has the aerogel of certain thickness to seal between heat preservation shell and the negative pole shell.
2. The novel structure of lithium ion battery usable in low temperature environment according to claim 1, characterized in that: the filling thickness of the aerogel is 1-2 mm.
3. The novel structure of lithium ion battery usable in low temperature environment according to claim 1, characterized in that: the aerogel is mesoporous silica type aerogel.
4. The novel structure of lithium ion battery usable in low temperature environment according to claim 1, characterized in that: the heat-insulating shell is made of nickel-plated steel or stainless steel.
5. The novel structure of lithium ion battery usable in low temperature environment according to claim 1, characterized in that: the welding has the closing plate between the top of lagging casing and the negative pole shell to form an airtight space between lagging casing, closing plate and the negative pole shell, the aerogel is filled in this space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123061181.3U CN216850085U (en) | 2021-12-08 | 2021-12-08 | Novel structure of lithium ion battery for low-temperature environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123061181.3U CN216850085U (en) | 2021-12-08 | 2021-12-08 | Novel structure of lithium ion battery for low-temperature environment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216850085U true CN216850085U (en) | 2022-06-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123061181.3U Active CN216850085U (en) | 2021-12-08 | 2021-12-08 | Novel structure of lithium ion battery for low-temperature environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216850085U (en) |
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2021
- 2021-12-08 CN CN202123061181.3U patent/CN216850085U/en active Active
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