Lithium ion battery with good high-temperature safety performance

Abstract

The utility model provides a lithium ion battery with excellent high-temperature safety performance, which relates to the technical field of lithium ion batteries and comprises a battery outer shell, a battery cell fixed in the battery outer shell, a fixed rod fixed in the battery cell, a plurality of electrode groups fixed on the side surface of the fixed rod and comprising positive plates and negative plates, a diaphragm is fixed between the positive plates and the negative plates, the tops of the plurality of positive plates are electrically connected with positive tabs, the bottoms of the plurality of negative plates are electrically connected with negative tabs, a diaphragm substrate is fixed in the diaphragm, a zirconium oxide interlayer is fixed on one side surface of the diaphragm substrate, and a plurality of micro hole groups are formed in the outer surface of the zirconium oxide interlayer. The distances between the adjacent micro hole groups are consistent, and each micro hole group comprises a plurality of micro cooling holes, so that the diaphragm between the positive plate and the negative plate has high-temperature resistance, namely the diaphragm is not easy to melt at high temperature, and the short circuit of the positive electrode and the negative electrode of the lithium ion battery can be effectively prevented; therefore, the effect of better safety performance is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion batteries, in particular to a lithium ion battery with good high-temperature safety performance. Background Art

[0002] Lithium-ion battery is a rechargeable battery that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, lithium ions are embedded and de-embedded between the two electrodes. When charging, lithium ions are de-embedded from the positive electrode and embedded into the negative electrode through the electrolyte. The negative electrode is in a lithium-rich state. The opposite is true during discharging.

[0003] In the prior art, there are many types of lithium-ion batteries, which can basically meet people's usage needs, but there are still certain shortcomings. The internal diaphragms of such existing lithium-ion batteries are generally polyethylene or polypropylene, and the melting points are relatively low. When the external environment temperature of the battery is too high, or the internal charging and discharging voltage is too high or the time is too long, it will cause excessive heat to be generated in the closed battery, resulting in melting. Therefore, the heat resistance of the battery needs to be improved. Utility Model Content

[0004] The utility model aims to solve the shortcomings of the prior art and proposes a lithium ion battery with good high temperature safety performance.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a lithium-ion battery with good high-temperature safety performance, including a battery shell, a battery cell is fixed inside the battery shell, a fixed rod is fixed inside the battery cell, a plurality of electrode groups are fixed on the side of the fixed rod, the plurality of electrode groups include a positive electrode sheet and a negative electrode sheet, a diaphragm is fixed between the positive electrode sheet and the negative electrode sheet, a plurality of positive electrode sheets are electrically connected to positive electrode tabs on the top, a plurality of negative electrode sheets are electrically connected to negative electrode tabs on the bottom, a diaphragm substrate is fixed inside the diaphragm, a zirconia interlayer is fixed on one side of the diaphragm substrate, a plurality of micro-hole groups are opened on the outer surface of the zirconia interlayer, the spacing between adjacent micro-hole groups is consistent, and the micro-hole group includes a plurality of micro-cooling holes. In the prior art, there are many types of lithium-ion batteries, which can basically meet people's usage needs. However, there are still some shortcomings. The diaphragms inside the existing lithium-ion batteries of this type are generally polyethylene or polypropylene, and the melting points are relatively low. When the external environment temperature of the battery is too high, or the internal charging and discharging voltage is too high or the time is too long, it will cause too much heat to be generated in the closed battery, resulting in melting. Therefore, the heat resistance of the battery needs to be improved. In response to such problems, the utility model adopts a diaphragm substrate fixed inside the diaphragm, and a zirconium oxide interlayer is fixed on one side of the diaphragm substrate. Since zirconium oxide has a high melting point, high hardness and excellent corrosion resistance, the diaphragm between the positive electrode sheet and the negative electrode sheet has high temperature resistance, that is, the diaphragm will not melt easily at high temperature, thereby effectively preventing the positive and negative electrodes of the lithium-ion battery from short-circuiting, thereby achieving a better safety performance.

[0006] Preferably, an upper protective cap is fixed on the top of the battery shell, a lower protective cap is fixed on the bottom of the battery shell, a circular groove is opened inside the lower protective cap, a protective shell is fixed inside the circular groove, a charging part is fixed inside the protective shell, a protective plug is clamped in the middle of the charging part, and a charging port is fixed inside the protective plug. In the prior art, when designing lithium-ion batteries, a charging area is directly designed at one end of the battery, and a socket is designed inside the charging area to achieve the effect of charging. However, if the battery is used for too long, more dust will accumulate inside the charging area. If more dust falls on the inner wall of the charging port, poor power connection will occur during charging, thereby affecting the use effect of the lithium-ion battery. In response to such problems, the utility model adopts a protective shell fixed inside the circular groove. By fixing the charging part inside the protective shell, when charging is needed, the protective plug in the middle of the charging part can be pulled out to charge. By designing the protective plug, a large amount of dust is effectively isolated from entering, thereby improving the use effect.

[0007] Preferably, the battery outer shell and the battery core are provided with a square groove, and a flame-retardant interlayer is fixed inside the square groove. In the prior art, when a lithium-ion battery is used for too long, it is prone to overload expansion or puncture leakage inside, which will cause the temperature of the battery to exceed the allowable value, thereby accelerating the aging of its surface insulation and even causing the insulation to burn, reducing the service life of the lithium-ion battery. To address such problems, the utility model adopts a flame-retardant interlayer fixed inside the square groove. The flame-retardant interlayer can have a good flame-retardant effect on the lithium-ion battery when the lithium-ion battery is overloaded and expanded or punctured and leaked, avoiding the generation of open flames, thereby achieving the effect of safe use.

[0008] Preferably, an alumina interlayer is fixed on the other side of the diaphragm substrate, and a plurality of cooling holes are opened on the outer surface of the alumina interlayer, and the cooling holes are consistent in size with the micro cooling holes. By designing the alumina interlayer and because alumina has high mechanical strength and good wear resistance, compression resistance, bending resistance and fatigue resistance, the stability effect of the diaphragm is improved.

[0009] Preferably, heat-resistant ceramic coatings are fixed on the sides of the plurality of positive electrode sheets and negative electrode sheets, so as to improve the high temperature resistance of the positive electrode sheets and negative electrode sheets and avoid local overheating.

[0010] Preferably, a battery shell cover is slidably connected to the side of the battery shell body, and the battery shell cover is consistent in length with the battery shell body. By designing the battery shell cover to have a sliding effect, the effect of conveniently opening the battery shell cover is achieved.

[0011] Preferably, the outer surfaces of the upper protective cap and the lower protective cap are all rounded to avoid wear and tear when the upper protective cap and the lower protective cap collide.

[0012] Beneficial Effects

[0013] 1. In the prior art, there are many types of lithium-ion batteries, which can basically meet people's usage needs, but there are still certain shortcomings. The diaphragms inside the existing lithium-ion batteries are generally polyethylene or polypropylene, and the melting points are relatively low. When the external environment temperature of the battery is too high, or the internal charging and discharging voltage is too high or the time is too long, it will cause excessive heat to be generated in the closed battery, resulting in melting. Therefore, the heat resistance of the battery needs to be improved. In response to such problems, the utility model adopts a diaphragm substrate fixed inside the diaphragm, and a zirconium oxide interlayer is fixed on one side of the diaphragm substrate. Since zirconium oxide has a high melting point, high hardness and excellent corrosion resistance, the diaphragm between the positive electrode sheet and the negative electrode sheet has high temperature resistance, that is, the diaphragm will not melt easily at high temperature, thereby effectively preventing the positive and negative electrodes of the lithium-ion battery from short-circuiting, thereby achieving a better safety performance.

[0014] 2. In the prior art, when lithium-ion batteries are designed, a charging area is directly designed at one end of the battery, and a socket is designed inside the charging area to achieve the effect of charging. However, if the battery is used for too long, more dust will accumulate inside the charging area. If more dust falls on the inner wall of the charging port, it will cause poor power connection during charging, thereby affecting the use effect of the lithium-ion battery. To address this problem, the utility model adopts a protective shell fixed inside the circular groove, and a charging part is fixed inside the protective shell. When charging is needed, the protective plug in the middle of the charging part can be pulled out to charge. By designing the protective plug, a large amount of dust can be effectively isolated from entering, thereby improving the use effect.

[0015] 3. In the prior art, when a lithium-ion battery is used for too long, it is easy for the inside of the battery to expand due to overload or be punctured and leaked, which will cause the temperature of the battery to exceed the allowable value, thereby accelerating the aging of the surface insulation and even causing the insulation to burn, reducing the service life of the lithium-ion battery. To address such problems, the utility model adopts a flame-retardant interlayer fixed inside the square groove. The flame-retardant interlayer can have a good flame-retardant effect on the lithium-ion battery when the lithium-ion battery is overloaded, expanded, punctured or leaked, avoiding the generation of open flames, thereby achieving the effect of safe use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the internal three-dimensional structure of the battery outer shell of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the utility model when viewed from above;

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure of the electrode group of the utility model;

[0019] Figure 4 It is a schematic diagram of the overall structure of the utility model.

[0020] Legend:

[0021] 1. Battery outer shell; 2. Battery cell; 3. Fixed rod; 4. Positive electrode sheet; 5. Negative electrode sheet; 6. Diaphragm; 7. Positive electrode ear; 8. Negative electrode ear; 9. Diaphragm substrate; 10. Zirconia interlayer; 11. Micro cooling hole; 12. Upper protective cap; 13. Lower protective cap; 14. Circular groove; 15. Protective shell; 16. Charging part; 17. Protective plug; 18. Flame retardant interlayer; 19. Alumina interlayer; 20. Cooling hole; 21. Heat-resistant ceramic coating; 22. Battery shell cover; 23. Rounded corners. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments and drawings, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0023] The specific embodiments of the present utility model are described below in conjunction with the accompanying drawings. Specific embodiment:

[0025] Reference Figure 1-4A lithium-ion battery with good high-temperature safety performance comprises a battery outer shell 1, a battery cell 2 is fixed inside the battery outer shell 1, a fixed rod 3 is fixed inside the battery cell 2, a plurality of electrode groups are fixed on the side of the fixed rod 3, the plurality of electrode groups comprise a positive electrode sheet 4 and a negative electrode sheet 5, a diaphragm 6 is fixed between the positive electrode sheet 4 and the negative electrode sheet 5, a plurality of positive electrode sheets 4 are electrically connected to positive electrode tabs 7 at the top, a plurality of negative electrode sheets 5 are electrically connected to negative electrode tabs 8 at the bottom, a diaphragm substrate 9 is fixed inside the diaphragm 6, a zirconia interlayer 10 is fixed on one side of the diaphragm substrate 9, a plurality of micro-pore groups are opened on the outer surface of the zirconia interlayer 10 , the spacing between adjacent micro hole groups is consistent, the micro hole group includes a plurality of micro cooling holes 11, an upper protective cap 12 is fixed on the top of the battery shell 1, a lower protective cap 13 is fixed on the bottom of the battery shell 1, a circular groove 14 is opened inside the lower protective cap 13, a protective shell 15 is fixed inside the circular groove 14, a charging part 16 is fixed inside the protective shell 15, a protective plug 17 is clamped in the middle of the charging part 16, a charging port is fixed inside the protective plug 17, a square groove is opened between the battery shell 1 and the battery core 2, a flame retardant interlayer 18 is fixed inside the square groove, and the other side of the diaphragm substrate 9 Alumina interlayer 19 is fixed, and a plurality of cooling holes 20 are opened on the outer surface of alumina interlayer 19, and the cooling holes 20 are consistent with the size of micro cooling holes 11, and a plurality of positive electrode sheets 4 and negative electrode sheets 5 are fixed with heat-resistant ceramic coatings 21 on their sides. In the prior art, there are many types of lithium-ion batteries, which can basically meet people's use needs, but there are still certain shortcomings. The diaphragms inside the existing lithium-ion batteries of this type are generally polyethylene or polypropylene, and the melting points are relatively low. When the external environment temperature of the battery is too high, or the internal charging and discharging voltage is too high or the time is too long, it will cause the seal to Too much heat is generated in a closed battery, resulting in melting, so the heat resistance of the battery needs to be improved. To address this problem, the utility model adopts a diaphragm substrate 9 fixed inside the diaphragm 6, and a zirconium oxide interlayer 10 is fixed on one side of the diaphragm substrate 9. Since zirconium oxide has a high melting point, high hardness and excellent corrosion resistance, the diaphragm 6 between the positive electrode sheet 4 and the negative electrode sheet 5 has high temperature resistance, that is, the diaphragm will not melt easily at high temperature, thereby effectively preventing the positive and negative electrodes of the lithium-ion battery from short-circuiting, thereby achieving a better safety performance.

[0026] A battery shell cover 22 is slidably connected to the side of the battery shell 1 . The battery shell cover 22 is consistent in length with the battery shell 1 . The outer surfaces of the upper protective cap 12 and the lower protective cap 13 are all formed with rounded corners 23 .

[0027] The working principle of the utility model is as follows: a zirconium oxide interlayer 10 is fixed on one side of the diaphragm substrate 9. Since zirconium oxide has a high melting point, high hardness and excellent corrosion resistance, the diaphragm 6 between the positive electrode sheet 4 and the negative electrode sheet 5 has high temperature resistance, that is, the diaphragm will not melt easily at high temperature, thereby effectively preventing the positive and negative electrodes of the lithium-ion battery from short-circuiting, thereby achieving a better safety performance. In addition, a flame-retardant interlayer 18 is fixed inside the square groove. The flame-retardant interlayer 18 can have a good flame-retardant effect on the lithium-ion battery when the lithium-ion battery is overloaded, expanded, punctured or leaked, and avoid the generation of open flames, thereby achieving a safe use effect.

[0028] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0029] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A lithium-ion battery with good high-temperature safety performance, comprising a battery outer shell (1), a battery cell (2) fixed inside the battery outer shell (1), a fixed rod (3) fixed inside the battery cell (2), a plurality of electrode groups fixed on the side of the fixed rod (3), the plurality of electrode groups comprising a positive electrode sheet (4) and a negative electrode sheet (5), a diaphragm (6) fixed between the positive electrode sheet (4) and the negative electrode sheet (5), a plurality of positive electrode sheets (4) having positive electrode tabs (7) electrically connected to the top, and a plurality of negative electrode sheets (5) having negative electrode tabs (8) electrically connected to the bottom, characterized in that: A diaphragm substrate (9) is fixed inside the diaphragm (6), a zirconium oxide interlayer (10) is fixed on one side of the diaphragm substrate (9), a plurality of micro-hole groups are formed on the outer surface of the zirconium oxide interlayer (10), the spacing between adjacent micro-hole groups is consistent, and the micro-hole groups include a plurality of micro-cooling holes (11).

2. A lithium-ion battery with good high temperature safety performance according to claim 1, characterized in that: An upper protective cap (12) is fixed on the top of the battery outer shell (1), a lower protective cap (13) is fixed on the bottom of the battery outer shell (1), a circular groove (14) is formed inside the lower protective cap (13), a protective shell (15) is fixed inside the circular groove (14), a charging part (16) is fixed inside the protective shell (15), a protective plug (17) is clamped in the middle of the charging part (16), and a charging port is fixed inside the protective plug (17).

3. A lithium-ion battery with good high temperature safety performance according to claim 1, characterized in that: The battery outer shell (1) and the battery core (2) are provided with square grooves, and a flame-retardant interlayer (18) is fixed inside the square grooves.

4. A lithium-ion battery with good high temperature safety performance according to claim 1, characterized in that: An alumina interlayer (19) is fixed on the other side of the diaphragm substrate (9), and a plurality of cooling holes (20) are opened on the outer surface of the alumina interlayer (19), and the cooling holes (20) are consistent in size with the micro cooling holes (11).

5. A lithium-ion battery with good high temperature safety performance according to claim 1, characterized in that: A heat-resistant ceramic coating (21) is fixed on the side surfaces of the plurality of positive electrode sheets (4) and negative electrode sheets (5).

6. A lithium-ion battery with good high temperature safety performance according to claim 1, characterized in that: The battery outer shell (1) is slidably connected to a battery shell cover (22) on the side thereof, and the battery shell cover (22) is consistent in length with the battery outer shell (1).

7. A lithium-ion battery with good high temperature safety performance according to claim 2, characterized in that: The outer surfaces of the upper protective cap (12) and the lower protective cap (13) are all configured with rounded corners (23) on all sides.

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