High-safety power battery with fuse and PTC (Positive Temperature Coefficient) connected in series and configured with CID

Abstract

The utility model discloses a high-safety power battery with a fuse and a PTC (Positive Temperature Coefficient) connected in series and configured with a CID (Charge Identification Device), which particularly relates to the technical field of batteries and comprises a shell, a positive electrode upper cover plate is fixedly connected to the lower end of the shell, a positive electrode post is fixedly connected to the middle of the positive electrode upper cover plate, and a positive electrode upper supporting plate is fixedly connected to the output end of the positive electrode post. A CID is installed in an inner cavity of the right portion of the positive electrode upper supporting plate, a positive electrode lower supporting plate is welded to the upper end of the CID, the outer surface of the positive electrode lower supporting plate and the outer surface of the positive electrode upper supporting plate are jointly and fixedly connected with a positive electrode plastic plate, and the upper end of the shell is fixedly connected with a lower plastic plate. According to the high-safety power battery with the fuse and the PTC connected in series and configured with the CID, the fuse and the PTC are assembled outside the negative end cover of the lithium power battery in series, and the CID is configured on the other end cover, so that two safety protection measures are formed, the safety of the battery is improved, and the safety effect of the battery is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a high security power battery that fuse and PTC are used in series and are configured CID. BACKGROUND

[0002] With the increasing demand for clean energy and sustainable transportation solutions worldwide, lithium batteries have become a key force in driving the development of electric vehicles and energy storage systems due to their high energy density, long cycle life, and environmental friendliness. In-depth research on the safety of lithium power batteries has become a key issue in promoting energy technology progress and achieving low-carbon economic transformation.

[0003] Power batteries are all equipped with explosion-proof valves, but the explosion-proof valves in the prior art are disposable and will release pressure after opening. After the pressure is released, it cannot automatically retract and can only be replaced, which is high in working cost. Therefore, a high-safety power battery that fuse and PTC are used in series and are configured CID is needed. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a high-safety power battery that fuse and PTC are used in series and are configured CID, which can effectively solve the problems raised in the above.

[0005] To achieve the above purpose, the technical scheme adopted by the utility model is:

[0006] A high-safety power battery that fuse and PTC are used in series and are configured CID, comprising a shell, the lower end of the shell is fixedly connected with a positive upper cover plate, the middle part of the positive upper cover plate is fixedly connected with a positive pole, the output end of the positive pole is fixedly connected with a positive upper supporting plate, the right inner cavity of the positive upper supporting plate is installed with a CID, the upper end of the CID is welded with a positive lower supporting plate, the outer surfaces of the positive lower supporting plate and the positive upper supporting plate are fixedly connected with a positive plastic plate, and the upper end of the shell is fixedly connected with a lower plastic plate.

[0007] Preferably, the upper part of the lower plastic plate is provided with a lower cover plate, the outer circle of the upper part of the lower cover plate is provided with a plastic supporting plate, the upper part of the plastic supporting plate is provided with an upper cover plate, the middle part of the upper cover plate is fixedly connected with an upper pole, the input end of the upper pole is fixedly connected with a fuse, a roll core is placed in the middle part of the inner cavity of the shell, the input end and the output end of the roll core are fixedly connected with bus bars, the output end of the bus bar located at the upper part is fixedly connected with a lower pole, and the left inner cavity of the positive upper cover plate is fixedly connected with an explosion-proof valve mechanism.

[0008] Preferably, rivets are used to connect the upper cover plate, the plastic supporting plate, the lower cover plate, and the lower plastic plate.

[0009] Preferably, the explosion-proof valve mechanism comprises a pressure relief chamber, the pressure relief chamber is fixedly connected to the left inner cavity of the positive electrode upper cover plate, support rods are fixedly connected to the left part and the right part of the outer surface of the pressure relief chamber, an air inlet plate is fixedly connected to the upper part of the inner cavity of the pressure relief chamber, an expansion sleeve is fixedly connected to the middle part of the lower end of the air inlet plate, an expansion rod is slidably connected to the inner cavity of the expansion sleeve, a pressure relief valve is fixedly connected to the lower end of the expansion rod, a spring is fixedly connected between the lower end of the air inlet plate and the upper end of the pressure relief valve, and six air inlet holes are arranged in the outer ring of the upper end of the air inlet plate.

[0010] Preferably, the pressure relief valve is slidably arranged in the lower part of the inner cavity of the pressure relief chamber.

[0011] Preferably, the two support rods are fixedly connected to the upper end of the positive electrode upper cover plate.

[0012] Preferably, the six air inlet holes are communicated with the inner cavity of the pressure relief chamber.

[0013] Compared with the prior art, the explosion-proof valve mechanism has the following beneficial effects:

[0014] 1、The fuse and the PTC are assembled in series outside the negative electrode end cover of the lithium power battery, a CID is arranged on the other end cover, two safety protection measures are formed, the safety of the battery is improved, and the safety effect of the battery is better.

[0015] 2、The explosion-proof valve mechanism can automatically open when the internal gas pressure of the battery is increased due to abnormal conditions such as overcharging, overheating or short circuit, release the internal gas, prevent the battery shell from being broken, reduce the risk of electrolyte leakage or fire, and automatically close after the gas is released, so that the explosion-proof valve mechanism is not replaced and the working cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic view of the overall structure of the utility model;

[0017] Figure 2 It is a schematic view of the overall structure of the utility model; Figure 1 It is an enlarged schematic view of A in the utility model;

[0018] Figure 3 It is a plan view of the explosion-proof valve mechanism of the utility model;

[0019] Figure 4 It is a top view of the air inlet plate of the utility model.

[0020] In the diagram: 1. Positive electrode post; 2. Explosion-proof valve mechanism; 3. Positive electrode upper cover plate; 4. Outer shell; 5. Busbar; 6. Lower plastic plate; 7. Lower cover plate; 8. Upper cover plate; 9. Upper electrode post; 10. Fuse; 11. Lower electrode post; 12. Core; 13. Positive electrode lower support plate; 14. Positive electrode upper support plate; 15. CID; 16. Positive electrode plastic plate; 17. Plastic support plate; 21. Pressure relief valve; 22. Pressure relief chamber; 23. Telescopic rod; 24. Spring; 25. Telescopic sleeve; 26. Air inlet plate; 27. Air inlet port; 28. Support rod. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] Example 1

[0023] like Figure 1 As shown, a high-safety power battery using a fuse and a PTC in series and configured with a CID includes a casing 4. A positive electrode upper cover plate 3 is fixedly connected to the lower end of the casing 4. A positive electrode post 1 is fixedly connected to the middle of the positive electrode upper cover plate 3. A positive electrode upper support plate 14 is fixedly connected to the output end of the positive electrode post 1. A CID 15 is installed in the inner cavity of the right side of the positive electrode upper support plate 14. A positive electrode lower support plate 13 is welded to the upper end of the CID 15. A positive electrode plastic plate 16 is fixedly connected to the outer surfaces of the positive electrode lower support plate 13 and the positive electrode upper support plate 14. A lower plastic plate 6 is fixedly connected to the upper end of the casing 4. A lower cover plate 7 is provided on the upper part of the plastic plate 6. A plastic support plate 17 is provided on the upper outer ring of the lower cover plate 7. An upper cover plate 8 is provided on the upper plastic support plate 17. An upper pole post 9 is fixedly connected to the middle of the upper cover plate 8. A fuse 10 is fixedly connected to the input end of the upper pole post 9. A core 12 is placed in the middle of the inner cavity of the outer shell 4. A busbar 5 is fixedly connected to both the input and output ends of the core 12. A lower pole post 11 is fixedly connected to the output end of the upper busbar 5. An explosion-proof valve mechanism 2 is fixedly connected to the left inner cavity of the positive upper cover plate 3.

[0024] Furthermore, the upper cover plate 8, the plastic support plate 17, the lower cover plate 7, and the lower plastic plate 6 are connected by rivets.

[0025] In this device, a lower conductive sheet is placed on the upper end of the lower cover plate 7, a PTC is placed on the upper end of the lower conductive sheet, an upper conductive sheet is placed on the upper end of the PTC, and an upper plastic plate is placed on the upper part of the upper conductive sheet.

[0026] The lower conductive sheet, upper conductive sheet, PTC and upper plastic plate are connected to the lower plastic plate 6, lower cover plate 7 and upper cover plate 8 by rivets, so that they are all connected together.

[0027] The current conduction path of this device is as follows:

[0028] The positive pole first enters the positive pole post 1, and the positive pole post 1 transmits the current to the positive upper supporting plate 14, and the positive upper supporting plate 14 transmits the current to the CID 15, and the CID 15 receives the current and then transmits the current to the positive lower supporting plate 13 in turn, so that the positive lower supporting plate 13 transmits the current to the winding core 12 through the lower bus bar 5, and the winding core 12 transmits the current to the lower pole post 11 through the upper bus bar 5, and the lower pole post 11 receives the current and then transmits the current to the lower conductive plate, so that the lower conductive plate transmits the current to the PTC, and then the PTC transmits the current to the upper conductive plate, and then the upper conductive plate transmits the current to the fuse 10, and finally the fuse 10 transmits the current to the upper pole post 9.

[0029] In the above, the upper pole post 9 is provided with a sealing ring I at the connection between the outer surface of the lower part and the upper cover plate 8, which ensures that the current cannot be transmitted to the upper cover plate 8, thereby preventing short circuit of the current.

[0030] In the above, the lower pole post 11 is fixedly connected with a sealing ring II on the outer surface, so that after the lower pole post 11 receives the current, the current can only be transmitted to the lower conductive plate and cannot be transmitted to the lower plastic plate 6 and the lower cover plate 7, thereby playing an insulating role.

[0031] In the above, the positive pole post 1 is fixedly connected with a sealing ring III on the outer surface at the connection with the positive upper cover plate 3, which also serves to isolate the current transmission between the positive pole post 1 and the positive upper cover plate 3 and plays an insulating role.

[0032] In the above, the PTC, i.e., the positive temperature coefficient thermistor, has the characteristic that when the battery current exceeds the standard range and reaches a certain threshold value, the temperature of the PTC itself rises, causing the resistance value of the PTC to rapidly increase, thereby reducing the current in the circuit and protecting the battery from damage; the PTC is a self-recovery type fuse, and when the current returns to the normal range, the resistance value of the PTC itself returns to the initial value.

[0033] In the above, the function of the fuse 10 is to cut off the current when the current abnormally increases, so that the fuse 10 melts when the current value reaches a certain height, thereby protecting the circuit; the fuse 10 is a one-time protection device and cannot be used again after melting.

[0034] In the above, the rated current of the fuse 10 is greater than that of the PTC, so that when the battery is abnormal, the PTC first functions, and when the current is too large and exceeds the bearing range of the PTC, the fuse 10 functions, and when the current is too large, the fuse 10 melts and the circuit is disconnected.

[0035] In the above, the CID 15 is a conductor in the positive electrode, so that the battery forms a complete circuit. When the battery is continuously abnormal, the battery internal reaction continues to produce a large amount of gas, and the internal pressure of the battery will continue to increase. When the internal pressure reaches a certain threshold, the CID 15 will be flipped upward to disconnect the connection with the bus bar 5, thereby cutting off the current, thereby playing a protective role.

[0036] In the above, the burst pressure of the CID 15 is lower than that of the explosion-proof valve mechanism 2, and the protection thereof occurs before the explosion-proof valve mechanism 2 is started, and cooperates with the explosion-proof valve mechanism 2 to provide a double-layer protection mechanism for the battery.

[0037] In the above, when the explosion-proof valve mechanism 2 releases the gas generated in the battery, it will automatically open, and when the gas is released, the explosion-proof valve mechanism 2 will automatically close and reseal.

[0038] Example two

[0039] Further, in order to realize the purpose of the battery internal gas pressure rising, the explosion-proof valve mechanism 2 automatically opening, discharging the gas, and then automatically closing, referring to Figure 2 、 Figure 3 and Figure 4 , the explosion-proof valve mechanism 2 comprises a pressure relief chamber 22, which is fixedly connected to the left inner cavity of the positive electrode upper cover plate 3. The left and right upper sides of the outer surface of the pressure relief chamber 22 are fixedly connected with support rods 28. The upper part of the inner cavity of the pressure relief chamber 22 is fixedly connected with an air inlet plate 26. The lower end of the air inlet plate 26 is fixedly connected with a telescopic sleeve 25. The inner cavity of the telescopic sleeve 25 is slidably connected with a telescopic rod 23. The lower end of the telescopic rod 23 is fixedly connected with a pressure relief valve 21. The air inlet plate 26 and the pressure relief valve 21 are fixedly connected with a spring 24. Six air inlet holes 27 are arranged in the outer ring of the upper end of the air inlet plate 26.

[0040] Further, the pressure relief valve 21 slides in the lower part of the inner cavity of the pressure relief chamber 22.

[0041] Further, the two support rods 28 are fixedly connected with the upper end of the positive electrode upper cover plate 3.

[0042] Further, the six air inlet holes 27 are communicated with the inner cavity of the pressure relief chamber 22.

[0043] In the above, when the battery internal pressure rises due to overcharge, overheating or short circuit, etc., the gas will first flow into the pressure relief chamber 22 through the positive electrode lower support plate 13 and the positive electrode upper support plate 14, and then the gas will flow downward through the air inlet holes 27 arranged in the upper end of the air inlet plate 26, and push the pressure relief valve 21 to move downward in the inner cavity of the pressure relief chamber 22. When the pressure relief valve 21 moves downward, it will pull the telescopic rod 23 to move downward in the inner cavity of the telescopic sleeve 25, and at the same time, the pressure relief valve 21 will pull the spring 24 to generate pressure.

[0044] When the pressure relief valve 21 moves downward, it moves out of the inner cavity of the pressure relief chamber 22, and the gas flows out of the pressure relief chamber 22, achieving the effect of discharging the gas in the battery and avoiding the explosion of the battery.

[0045] In the above, when the gas is discharged, the spring 24 releases the pressure, pulls the pressure relief valve 21 to move upward to the original position, and drives the telescopic rod 23 to move upward to reseal the battery.

[0046] In the above, the pulling force of the spring 24 is greater than the gravity of the pressure relief valve 21.

[0047] In the above, by releasing the pressure, the explosion-proof valve mechanism 2 prevents the rupture of the battery shell and reduces the risk of electrolyte leakage or fire.

[0048] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. It should be understood by those skilled in the art that the utility model is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model can also have various changes and improvements, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A high safety power battery using fuse and PTC in series and configuring CID, comprising a shell (4), characterized in that: The lower end of the shell (4) is fixedly connected with the positive upper cover plate (3), the middle part of the positive upper cover plate (3) is fixedly connected with the positive pole (1), the output end of the positive pole (1) is fixedly connected with the positive upper supporting plate (14), the right inner cavity of the positive upper supporting plate (14) is installed with the CID (15), the upper end of the CID (15) is welded with the positive lower supporting plate (13), the outer surfaces of the positive lower supporting plate (13) and the positive upper supporting plate (14) are fixedly connected with the positive plastic plate (16) together, the upper end of the shell (4) is fixedly connected with the lower plastic plate (6), the upper part of the lower plastic plate (6) is provided with the lower cover plate (7), the outer circle of the upper part of the lower cover plate (7) is provided with the plastic supporting plate (17), the upper part of the plastic supporting plate (17) is provided with the upper cover plate (8), the middle part of the upper cover plate (8) is fixedly connected with the upper pole (9), the input end of the upper pole (9) is fixedly connected with the fuse (10), the inner cavity of the shell (4) is placed with the roll core (12), the input end and the output end of the roll core (12) are fixedly connected with the bus bar (5), the output end of the bus bar (5) located at the upper part is fixedly connected with the lower pole (11), and the left inner cavity of the positive upper cover plate (3) is fixedly connected with the explosion-proof valve mechanism (2).

2. The high-safety power battery according to claim 1, which uses a fuse and a PTC in series and is configured with a CID, is characterized in that: The rivets are used for connecting between the upper cover plate (8), the plastic supporting plate (17), the lower cover plate (7) and the lower plastic plate (6).

3. The high-safety power battery according to claim 1, which uses a fuse and a PTC in series and is configured with a CID, is characterized in that: The explosion-proof valve mechanism (2) comprises a pressure relief bin (22), the pressure relief bin (22) is fixedly connected to the left inner cavity of the positive upper cover plate (3), the left part and the right part of the upper side of the outer surface of the pressure relief bin (22) are fixedly connected with the supporting rod (28), the inner cavity of the pressure relief bin (22) is fixedly connected with the air inlet plate (26), the lower end of the air inlet plate (26) is fixedly connected with the telescopic sleeve (25), the inner cavity of the telescopic sleeve (25) is slidably connected with the telescopic rod (23), the lower end of the telescopic rod (23) is fixedly connected with the pressure relief valve (21), the lower end of the air inlet plate (26) and the upper end of the pressure relief valve (21) are fixedly connected with the spring (24) together, and six air inlet holes (27) are arranged in the annular array on the outer circle of the upper end of the air inlet plate (26).

4. A high-safety power battery according to claim 3, wherein a fuse and a PTC are used in series and configured with a CID, characterized in that: The pressure relief valve (21) slides in the lower part of the inner cavity of the pressure relief bin (22).

5. A high-safety power battery according to claim 3, wherein a fuse and a PTC are used in series and configured with a CID, characterized in that: Both of the supporting rods (28) are fixedly connected with the upper end of the positive upper cover plate (3).

6. The high safety power battery of claim 3, wherein the fuse and the PTC are connected in series and the CID is configured. Six air inlet holes (27) are communicated with the inner cavity of the pressure relief bin (22).

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