High-safety power battery configured with CID and fuse

Abstract

The utility model discloses a high-safety power battery equipped with a CID and a fuse, and particularly relates to the technical field of lithium batteries, the high-safety power battery comprises a battery shell, the top of the battery shell is fixedly connected with a negative electrode upper cover plate, the bottom of the battery shell is fixedly connected with a positive electrode upper cover plate, and a protection assembly is arranged in the battery shell. The protection assembly comprises a positive electrode plastic plate. According to the high-safety power battery provided with the CID and the fuse, the protection assembly is arranged, specifically, when the current is too large and the fuse is not fused, gas in the battery blows the current interruption device to turn over to cut off the current, so that a circuit can be cut off in a shorter time, and the safety of the battery is improved. The current interruption device can cut off the circuit even if the fuse is not fused in time during overcurrent due to a certain reason, so that the risk of safety accidents is reduced.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a high-safety power battery equipped with CID and a fuse. Background Technology

[0002] In the field of modern technology, lithium-ion batteries occupy an important position in electric vehicles and energy storage systems due to their high energy density and other advantages. However, their safety has always been a major factor restricting the further development of the industry. When a lithium-ion battery encounters an overcurrent situation, if protection is not timely, heat accumulates rapidly inside the battery, which can easily lead to catastrophic consequences such as overheating, fire, or even explosion. This not only seriously hinders the normal operation of equipment but also poses a huge threat to the lives of personnel. Therefore, the development of an efficient and reliable safety protection structure for lithium-ion batteries is urgently needed.

[0003] Lithium batteries rely on fuse blowing as an overcurrent protection mechanism. When the current in the circuit exceeds the rated current of the fuse, the metal wire of the fuse will melt due to heat, thereby cutting off the circuit and preventing excessive current from damaging the battery and other circuit components.

[0004] Existing lithium batteries have only a single protection mechanism: the fuse relies on the heat generated by the current to melt the fusible element and cut off the circuit. This requires a certain amount of time to accumulate heat, which may not be able to respond quickly enough to cut off the circuit. During this time, the battery and other components in the circuit will be subjected to continuous overcurrent impact, causing component damage, battery overheating, or even more serious safety problems. Moreover, as the only protection device, if the fuse itself fails, it may cause the entire protection mechanism to fail, increasing the risk of safety accidents. Therefore, we propose a high-safety power battery with CID and fuse to solve the above problems. Utility Model Content

[0005] The main objective of this invention is to provide a high-safety power battery equipped with CID and a fuse, which can effectively solve the above problems.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A high-safety power battery with CID and fuse includes a battery casing, a power battery fixedly connected to the inner wall of the battery casing, a negative electrode cover plate fixedly connected to the top of the battery casing, a positive electrode cover plate fixedly connected to the bottom of the battery casing, and a protective component disposed inside the battery casing.

[0008] Preferably, the upper and lower electrodes of the power battery are respectively fixedly connected to the busbar on the same side. The protection component includes a positive electrode plastic plate. The outer surface of the positive electrode plastic plate is fixedly connected to the inner wall of the bottom of the battery casing. A positive electrode lower support plate is fixedly connected to the inner wall of the positive electrode plastic plate. A positive electrode busbar is fixedly connected to the top of the positive electrode lower support plate. The top of the positive electrode busbar is fixedly connected to the bottom of the power battery. A square groove is formed on the top of the positive electrode lower support plate. A vent pipe is fixedly connected to the inner wall of the square groove.

[0009] Preferably, the inner wall of the positive electrode plastic plate is fixedly connected to an upper positive electrode support plate, which is located below the lower positive electrode support plate.

[0010] Preferably, the top of the positive electrode upper support plate is provided with a square groove II, and two connecting blocks are rotatably connected to the inner wall of the square groove II. The two connecting blocks are fixedly connected to a current interruption device at their close ends.

[0011] Preferably, the top of the current interruption device is welded to the bottom of the positive electrode lower support plate, and a fixing plate is fixedly connected to the bottom of the current interruption device, with the fixing plate located on the front of the vent pipe.

[0012] Preferably, the top of the vent pipe is funnel-shaped, and three sub-pipes are fixedly connected to the bottom of the vent pipe, with the front of each of the three sub-pipes contacting the back of the fixing plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This utility model, by setting up a protective component, specifically, when the current is too large and the fuse has not yet blown, the gas inside the battery blows the current interruption device to flip and cut off the current. This not only cuts off the circuit in a shorter time, reducing the time of damage to the battery and equipment caused by overcurrent and avoiding serious safety problems, but also, even if the fuse fails to blow in time during overcurrent for some reason, the current interruption device can still cut off the circuit, reducing the risk of safety accidents.

[0015] 2. This utility model features three sub-tubes. Specifically, the top of the vent pipe is funnel-shaped with a wide upper opening and a relatively narrow lower opening, allowing more gas to enter the vent pipe at the same time. The three smaller sub-tubes increase the speed at which the gas is blown toward the fixed plate, ensuring that the gas is accurately blown toward the connecting block, improving the directionality and accuracy of gas transmission. Furthermore, the gas flow rate increases as it flows toward the connecting block, causing the current interruption device to rotate more quickly. Attached Figure Description

[0016] Figure 1 This is the front view of the present utility model;

[0017] Figure 2 This is the left view of the present invention;

[0018] Figure 3 This is a front view of the vent pipe of this utility model;

[0019] Figure 4 This is a bottom view of the current interruption device of this utility model.

[0020] In the diagram: 1. Battery casing; 11. Negative electrode top cover; 12. Positive electrode top cover; 2. Protection components; 21. Positive electrode plastic plate; 211. Positive electrode lower support plate; 212. Positive electrode upper support plate; 22. Positive electrode busbar; 23. Vent pipe; 24. Current interruption device; 241. Connecting block; 242. Fixing plate. 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, such as Figure 1-4 As shown, a high-safety power battery with CID and fuse includes a battery casing 1, a power battery is fixedly connected to the inner wall of the battery casing 1, a negative electrode cover plate 11 is fixedly connected to the top of the battery casing 1, a positive electrode cover plate 12 is fixedly connected to the bottom of the battery casing (1), and a protection component 2 is provided inside the battery casing (1).

[0023] Specifically, to achieve the goal of providing the device with a dual protection mechanism, see [reference needed]. Figure 2 and Figure 3 In this embodiment, the upper and lower electrodes of the power battery are respectively fixedly connected to the busbar on the same side. The protection component 2 includes a positive electrode plastic plate 21. The outer surface of the positive electrode plastic plate 21 is fixedly connected to the inner wall of the bottom of the battery shell 1. A positive electrode lower support plate 211 is fixedly connected to the inner wall of the positive electrode plastic plate 21. A positive electrode busbar 22 is fixedly connected to the top of the positive electrode lower support plate 211. The top of the positive electrode busbar 22 is fixedly connected to the bottom of the power battery. A square groove is formed on the top of the positive electrode lower support plate 211. A vent pipe 23 is fixedly connected to the inner wall of the square groove.

[0024] Further reading Figure 3 In this embodiment, the inner wall of the positive electrode plastic plate 21 is fixedly connected to the positive electrode upper support plate 212, which is located below the positive electrode lower support plate 211.

[0025] Further reading Figure 3In this embodiment, a square groove 2 is provided on the top of the positive electrode upper support plate 212. Two connecting blocks 241 are rotatably connected to the inner wall of the square groove 2. A current interruption device 24 is fixedly connected to one end of the two connecting blocks 241 that are close to each other.

[0026] Further reading Figure 3 In this embodiment, the top of the current interruption device 24 is welded to the bottom of the positive electrode lower support plate 211, and a fixing plate 242 is fixedly connected to the bottom of the current interruption device 24. The fixing plate 242 is located on the front of the vent pipe 23.

[0027] During implementation, when the current is too high and exceeds the fuse's capacity, and the fuse has not yet blown, the chemical reaction inside the battery will produce a large amount of gas, causing the internal pressure of the battery to rise rapidly. The gas produced will be discharged through the vent pipe 23 fixed to the inner wall of the positive electrode lower support plate 211. The discharged gas will blow towards the back of the fixed plate 242. When the internal pressure of the battery reaches a certain level, the discharged gas will break the solder joint between the current interruption device 24 and the positive electrode lower support plate 211, allowing the current interruption device 24 to flip over. Its top will separate from the bottom of the positive electrode lower support plate 211, thereby cutting off the current. This makes the current interruption device 24 and the fuse form a synergistic protection mechanism. In the event of a severe overcurrent, it can not only cut off the circuit in a shorter time, reducing the time of damage to the battery and equipment caused by the overcurrent and avoiding serious safety problems, but also, even if the fuse fails to blow in time during an overcurrent for some reason, the current interruption device 24 can still cut off the circuit, reducing the risk of safety accidents.

[0028] Example 2: This example sets up three sub-tubes based on Example 1.

[0029] Specifically, in order to accelerate the speed at which gas is blown toward the connecting block, see [reference needed]. Figure 3 and Figure 4 In this embodiment, the top of the current interruption device 24 is welded to the bottom of the positive electrode lower support plate 211, and a fixing plate 242 is fixedly connected to the bottom of the current interruption device 24. The fixing plate 242 is located on the front of the vent pipe 23.

[0030] During implementation, when gas is generated inside the battery casing 1, the top of the vent pipe 23 is funnel-shaped with a wide opening at the top and a relatively narrow opening at the bottom, exhibiting a uniform contraction from top to bottom. This increases the flow rate of gas entering the vent pipe 23 from inside the battery casing 1, allowing more gas to enter the vent pipe 23 at the same time. The bottom of the vent pipe 23 is equipped with three smaller sub-pipes, which can increase the speed at which the gas is blown toward the fixed plate 242. This not only ensures that the gas is accurately blown toward the connecting block 241, improving the directionality and accuracy of gas transmission, but also increases the flow rate of the gas as it flows toward the connecting block, causing the current interruption device 24 to rotate more quickly.

[0031] The working principle of this utility model is as follows: Under normal operating conditions, both the fuse and the current interruption device 24 are in standby mode. When a slight overcurrent occurs in the circuit, the fuse acts first, limiting the current through its own resistance change and heat generation, thus maintaining the normal operation of the circuit as much as possible and preventing the battery from being damaged by a small degree of overcurrent. When the current is too large, exceeding the fuse's withstand capacity, and the fuse has not yet completely blown, the chemical reaction inside the battery will produce a large amount of gas, causing the internal pressure of the battery to rise rapidly. The generated gas will be discharged through the vent pipe 23 fixed to the inner wall of the positive electrode lower support plate 211, and the discharged gas will be blown towards the back of the fixed plate 242. When the internal pressure of the battery reaches a certain level, the discharged gas will break the solder joint between the current interruption device 24 and the positive electrode lower support plate 211, allowing the current interruption device 24 to flip over. Its top separates from the bottom of the positive electrode lower support plate 211, thereby cutting off the current. This makes the current interruption device 24 and the fuse form a synergistic protection mechanism. In the event of a severe overcurrent, it can not only cut off the circuit in a shorter time, reducing the time of damage to the battery and equipment caused by the overcurrent and avoiding serious safety problems, but also, even if the fuse fails to melt in time during the overcurrent for some reason, the current interruption device 24 can still cut off the circuit, reducing the risk of safety accidents.

[0032] When gas is generated inside the battery casing 1, the top of the vent pipe 23 is funnel-shaped with a wide opening at the top and a relatively narrow opening at the bottom, exhibiting a uniform contraction from top to bottom. This increases the flow rate of gas from inside the battery casing 1 into the vent pipe 23, allowing more gas to enter the vent pipe 23 at the same time. The bottom of the vent pipe 23 is equipped with three smaller sub-pipes, which can increase the speed at which the gas is blown toward the fixed plate 242. This not only ensures that the gas is blown accurately toward the connecting block 241, improving the directionality and accuracy of gas transmission, but also increases the flow rate of the gas as it flows toward the connecting block, causing the current interruption device 24 to rotate more quickly.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-safety power battery equipped with CID and a fuse, comprising a battery casing (1), wherein a power battery is fixedly connected to the inner wall of the battery casing (1), a negative electrode cover plate (11) is fixedly connected to the top of the battery casing (1), and a positive electrode cover plate (12) is fixedly connected to the bottom of the battery casing (1), characterized in that: The battery casing (1) is provided with a protective component (2).

2. A high-safety power battery with CID and fuse as described in claim 1, characterized in that: The upper and lower electrodes of the power battery are respectively fixedly connected to the busbar on the same side. The protection component (2) includes a positive electrode plastic plate (21). The outer surface of the positive electrode plastic plate (21) is fixedly connected to the bottom inner wall of the battery shell (1). A positive electrode lower support plate (211) is fixedly connected to the inner wall of the positive electrode plastic plate (21). A positive electrode busbar (22) is fixedly connected to the top of the positive electrode lower support plate (211). The top of the positive electrode busbar (22) is fixedly connected to the bottom of the power battery. A square groove is opened on the top of the positive electrode lower support plate (211). A vent pipe (23) is fixedly connected to the inner wall of the square groove.

3. A high-safety power battery with CID and fuse as described in claim 2, characterized in that: The inner wall of the positive electrode plastic plate (21) is fixedly connected to the positive electrode upper support plate (212), which is located below the positive electrode lower support plate (211).

4. A high-safety power battery with CID and fuse as described in claim 3, characterized in that: The top of the positive electrode upper support plate (212) is provided with a square groove II. The inner wall of the square groove II is rotatably connected to two connecting blocks (241). The two connecting blocks (241) are fixedly connected to a current interruption device (24) at their close ends.

5. A high-safety power battery with CID and fuse as described in claim 4, characterized in that: The top of the current interruption device (24) is welded to the bottom of the positive electrode lower support plate (211), and a fixing plate (242) is fixedly connected to the bottom of the current interruption device (24), which is located on the front of the vent pipe (23).

6. A high-safety power battery with CID and fuse as described in claim 5, characterized in that: The top of the vent pipe (23) is funnel-shaped, and three sub-pipes are fixedly connected to the bottom of the vent pipe (23). The front of each of the three sub-pipes is in contact with the back of the fixing plate (242).

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