High-safety power battery with fuse and PTC (Positive Temperature Coefficient) used in parallel

Abstract

The utility model discloses a high-safety power battery with a fuse and a PTC (Positive Temperature Coefficient) used in parallel, and particularly relates to the technical field of power batteries, the high-safety power battery comprises an upper pole, a lower pole and two conducting strips, the conducting strip on the uppermost side is fixedly connected with the upper pole, the conducting strip on the lowermost side is fixedly connected with the lower pole, and the two conducting strips are fixedly connected with the upper pole. A PTC (Positive Temperature Coefficient) resistance tape is fixedly connected between the two conducting strips, the bottom end of the lower pole is fixedly connected with a bus bar, the upper pole is fixedly connected with a fuse, the other end of the fuse is fixedly connected with a conducting plate, the conducting plate is fixedly connected with the lower pole, and the bottom end of the conducting plate is fixedly connected with the bus bar. According to the high-safety power battery with the fuse and the PTC used in parallel, the fuse and the PTC resistance tape are assembled outside the end cover of the lithium power battery in parallel, so that the influence on the internal structure of the battery when the internal current of the battery is abnormally increased can be effectively reduced, and the safety performance of the battery is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a high-safety power battery that uses a fuse and a PTC connected in parallel. Background Technology

[0002] Power lithium batteries are a new type of high-energy battery that uses lithium-ion batteries as materials, can store electrical energy and recharge to supply power to automobiles and other vehicles. They have the characteristics of high voltage, high energy density, long cycle life, low self-discharge rate, no memory effect, and no pollution. Their working principle is that when charging, lithium ions are released from the positive electrode, move through the electrolyte to the negative electrode, and electrons flow from the positive electrode to the negative electrode through the external circuit. The opposite is true when discharging.

[0003] Over time, lithium-ion battery technology has been widely used in various fields and has gradually become the preferred energy storage solution for new energy vehicles such as electric vehicles and hybrid vehicles. Although lithium-ion batteries have many advantages, their safety has always been a focus of public and industry attention. In the application of lithium-ion batteries, lithium batteries may cause fires or explosions under abnormal conditions such as overcharging, over-discharging, and short circuits. Therefore, there are still many issues to be resolved regarding the safety performance of lithium-ion batteries.

[0004] The above background information is provided only to aid in understanding the concept and technical solution of this utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Utility Model Content

[0005] The main objective of this invention is to provide a high-safety power battery that uses a fuse and a PTC connected in parallel, which can effectively solve the problems mentioned above.

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

[0007] A high-safety power battery using a fuse and a PTC resistor in parallel includes: an upper terminal post, a lower terminal post, and two conductive plates. The uppermost conductive plate is fixedly connected to the upper terminal post, and the lowermost conductive plate is fixedly connected to the lower terminal post. A PTC resistor strip is fixedly connected between the two conductive plates. A busbar is fixedly connected to the bottom end of the lower terminal post. A fuse is fixedly connected to the upper terminal post, and the other end of the fuse is fixedly connected to a conductive plate. The conductive plate is fixedly connected to the lower terminal post, and the bottom end of the conductive plate is fixedly connected to the busbar. A wound core is welded to the side of the busbar away from the conductive plate.

[0008] Preferably, the resistor heat dissipation assembly includes multiple housings and a heat-conducting strip, the bottom end of the heat-conducting strip is fixedly connected to the upper surface of the PTC resistor strip, and the multiple housings are equidistantly mounted on the top end of the heat-conducting strip.

[0009] Preferably, two partitions are installed at equal intervals in the inner cavity of the housing, and the two partitions divide the inner cavity of the housing into three parts: an installation cavity, a heat dissipation cavity one, and a heat dissipation cavity two. The bottom end of the inner cavity of the heat dissipation cavity two is open.

[0010] Preferably, an electromagnet is fixedly installed at the top of the inner cavity of the mounting cavity, and a conductive wire is fixedly connected to the input end of the electromagnet, with the other end of the conductive wire fixedly connected to the fuse.

[0011] Preferably, a fluid flow pipe is fixedly connected to the bottom end of the lowest partition away from the middle, and a plastic valve is fixedly connected to the inner surface of the fluid flow pipe. An airflow pipe is installed through the upper surface of the second inner cavity of the heat dissipation cavity, and the other end of the airflow pipe passes through the upper surface of the outer surface of the shell and extends into the upper side of the first inner cavity of the heat dissipation cavity.

[0012] Preferably, a guide rod 1 is fixedly connected to the axis of the two opposing surfaces of the partitions. An annular iron block is slidably mounted on the outer surface of the guide rod 1. Four guide rods 2 are respectively mounted in an annular array on the side of the two opposing surfaces away from the axis. A collar is slidably mounted on the outer surface of the four guide rods 2. The inner cavity surface of the collar at the axis is coaxially and fixedly connected to the outer surface of the annular iron block. Four springs are respectively sleeved on the outer surface of the four guide rods 2. The two ends of the four springs abut against the collar and the lowermost partition.

[0013] Preferably, multiple heat dissipation fins are equidistantly installed on the outer surface of the housing.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention relates to a method of assembling a fuse and a PTC resistor in parallel on the outside of the end cover of a lithium-ion battery, which can effectively reduce the impact on the internal structure of the battery when the internal current of the battery rises abnormally, thus ensuring the safety performance of the battery.

[0016] 2. This utility model cools the PTC resistor strip by setting up a resistor heat dissipation component. In this way, when the fuse has not blown, the resistance of the PTC resistor strip to the current is reduced by the temperature rise. At the same time, when the fuse blows, the resistor heat dissipation component also releases the cooling effect on the PTC resistor strip. This quickly enhances the resistance of the PTC resistor strip to the current and improves the current blocking effect of the PTC resistor strip under different conditions. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional structural diagram of the resistive heat dissipation component of this utility model.

[0019] In the diagram: 1. Upper electrode post; 2. Lower electrode post; 3. Conductive plate; 4. Conductive sheet; 5. Fuse; 6. PTC resistor strip; 7. Busbar; 8. Resistor heat dissipation assembly; 81. Housing; 82. Heat-conducting strip; 83. Partition plate; 831. Mounting cavity; 832. Heat dissipation cavity one; 833. Heat dissipation cavity two; 84. Electromagnet; 85. Conductive wire; 86. Guide rod one; 861. Guide rod two; 862. Spring; 87. Ring-shaped iron block; 871. Collar; 88. Liquid flow tube; 881. Plastic valve; 882. Air flow tube; 89. Heat dissipation fins. Detailed Implementation

[0020] 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.

[0021] Example 1

[0022] like Figure 1 As shown, a high-safety power battery using a fuse and a PTC in parallel includes: an upper terminal post 1, a lower terminal post 2, and two conductive plates 4. The uppermost conductive plate 4 is fixedly connected to the upper terminal post 1, and the lowermost conductive plate 4 is fixedly connected to the lower terminal post 2. A PTC resistor strip 6 is fixedly connected between the two conductive plates 4. A busbar 7 is fixedly connected to the bottom end of the lower terminal post 2. A fuse 5 is fixedly connected to the upper terminal post 1. The other end of the fuse 5 is fixedly connected to a conductive plate 3. The conductive plate 3 is fixedly connected to the lower terminal post 2. The bottom end of the conductive plate 3 is fixedly connected to the busbar 7. A coiled core is welded to the side of the busbar 7 away from the conductive plate 3.

[0023] In this embodiment, the PTC resistor 6 and the fuse 5 form a parallel circuit, and the current is divided into two lines. Figure 1 The circuit 1 with medium current conduction is: upper pole: 1 → upper conductive plate 4 → PTC resistor strip 6 → lower conductive plate 4 → lower pole 2 → bus bar 7; the circuit 2 is: upper pole 1 → fuse 5 → lead plate 3 → lower pole 2 → bus bar 7.

[0024] Since PTC resistor strip 6 is a positive temperature coefficient thermistor, when the battery current exceeds the normal value and reaches a certain value, the temperature of PTC resistor strip 6 rises and the resistance increases sharply, which reduces the current in the circuit and protects the battery from damage.

[0025] When the current passing through PTC resistor 6 is small, the resistance value of PTC resistor 6 is small, and PTC resistor 6 can be used normally.

[0026] When the battery malfunctions and the current reaches the trip current of PTC resistor band 6, PTC resistor band 6 will heat up rapidly, causing its resistance to increase dramatically. At this point, because the resistance of PTC resistor band 6 is too high and the resistance of fuse 5 is very low (the two are connected in parallel), fuse 5 will short-circuit PTC resistor band 6, diverting most of the current to fuse 5, which will then trip. When the circuit current exceeds twice the rated current of fuse 5, fuse 5 will melt within seconds, providing circuit protection.

[0027] If fuse 5 does not blow, after the battery malfunction is resolved, when a small current flows through the current branch of PTC resistor 6 again, PTC resistor 6 will return to its original resistance value, and the battery can continue to be used normally.

[0028] The core in this design, together with other components, forms the power battery.

[0029] Example 2

[0030] By setting up the resistor heat dissipation component 8 to cool down the PTC resistor strip, the resistance of the PTC resistor strip to the current is reduced when the fuse has not blown. At the same time, when the fuse blows, the resistor heat dissipation component 8 simultaneously removes the cooling effect on the PTC resistor strip, thus quickly increasing the resistance of the PTC resistor strip to the current and improving the current blocking effect of the PTC resistor strip under different conditions.

[0031] Specific examples Figure 2 As shown, the resistor heat dissipation assembly 8 includes multiple housings 81 and heat-conducting strips 82. The bottom end of the heat-conducting strips 82 is fixedly connected to the upper surface of the PTC resistor strip 6, and the multiple housings 81 are equidistantly installed on the top of the heat-conducting strips 82.

[0032] Two partitions 83 are installed at equal intervals in the inner cavity of the housing 81. The two partitions 83 divide the inner cavity of the housing 81 into three parts: the mounting cavity 831, the heat dissipation cavity one 832 and the heat dissipation cavity two 833. The bottom end of the inner cavity of the heat dissipation cavity two 833 is open.

[0033] An electromagnet 84 is fixedly installed at the top of the inner cavity of the mounting cavity 831. A conductive wire 85 is fixedly connected to the input end of the electromagnet 84, and the other end of the conductive wire 85 is fixedly connected to the fuse 5.

[0034] A liquid flow pipe 88 is fixedly connected to the bottom end of the lowest partition 83 on the side away from the middle. A plastic valve 881 is fixedly connected to the inner surface of the liquid flow pipe 88. An air flow pipe 882 is installed through the upper surface of the inner surface of the second heat dissipation cavity 833. The other end of the air flow pipe 882 passes through the upper surface of the outer surface of the housing 81 and extends into the upper side of the inner cavity of the first heat dissipation cavity 832.

[0035] Two guide rods 86 are fixedly connected to the axis of the two opposing surfaces of the partitions 83. A ring-shaped iron block 87 is slidably installed on the outer surface of the guide rod 86. Four guide rods 861 are installed in a ring array on the side of the two opposing surfaces of the partitions 83 away from the axis. A collar 871 is slidably installed on the outer surface of the four guide rods 861. The inner surface of the collar 871 at the axis is coaxially fixedly connected to the outer surface of the ring-shaped iron block 87. Four springs 862 are respectively sleeved on the outer surface of the four guide rods 861. The two ends of the four springs 862 are respectively held between the collar 871 and the lowermost partition 83.

[0036] Multiple heat dissipation fins 89 are equidistantly installed on the outer surface of the housing 81;

[0037] Electromagnet 84 is electrically connected to fuse 5 via conductive wire 85. The magnetic poles of the output end of electromagnet 84 and the end face of the ring iron block 87 that are close to each other are opposite. When fuse 5 is not blown, since the magnetic poles of the output end of electromagnet 84 and the end face of the ring iron block 87 that are close to each other are opposite, the repulsive force of opposite magnetic poles pushes the ring iron block 87 and the collar 871 vertically downward along the guide rod 1 86. In this way, the coolant in the inner cavity of the heat dissipation cavity 1 832 is pushed into the heat dissipation cavity 2 833 through the flow pipe 88. The PTC resistor strip 6 is in contact with the heat-conducting strip 82. In this way, when the coolant enters the heat dissipation cavity 2 833, it absorbs the heat emitted by the PTC resistor strip 6 and dissipates heat from the PTC resistor strip 6.

[0038] Conversely, when fuse 5 is blown, electromagnet 84 loses its magnetism. At this time, the tension of multiple springs 862 pushes the annular iron block 87 and collar 871 upward. After the annular iron block 87 and collar 871 are upward, a negative pressure is formed in the lower part of the inner cavity of heat dissipation cavity one 832. In this way, the coolant in heat dissipation cavity two 833 is drawn back into heat dissipation cavity one 832 through the flow pipe 88 to relieve the heat dissipation of PTC resistor band 6. Thus, PTC resistor band 6 will accelerate the temperature rise after being subjected to high voltage, thus blocking the flow of high voltage current.

[0039] It is worth mentioning the electromagnet 84 here. The magnetism generated by the electromagnet 84 and the conductive wire 85 when energized is based on the Ampere molecular current hypothesis and the magnetic effect of current in the prior art. Its working principle is as follows: According to the Ampere molecular current hypothesis, there is a molecular current inside the iron. Usually, the orientation is random and does not show magnetism. When energized, the orientation is made to be roughly the same and thus shows magnetism. At the same time, the magnetic effect of the current generates a magnetic field around the energized iron block, making the magnetic domains in the iron align, thus making the whole exhibit magnetism. In this way, when energized, the electromagnet 84 forms magnetism and repels the ring-shaped iron block 87.

[0040] By setting up the airflow pipe 882, the coolant can avoid not flowing properly due to different airflow. The top of the plastic valve 881 is provided with a cross-shaped cut, so that the coolant in the heat dissipation chamber 1 832 or heat dissipation chamber 2 833 cannot flow unnecessarily through the flow pipe 88 when there is no external force.

[0041] The multiple heat dissipation fins 89 installed in a ring array on the outer surface of the housing 81 can accelerate the dissipation of heat from the coolant and play a role in cooling the coolant.

[0042] 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 using a fuse and a PTC connected in parallel, characterized in that, include: The upper pole (1), the lower pole (2) and two conductive plates (4) are provided. The uppermost conductive plate (4) is fixedly connected to the upper pole (1), and the lowermost conductive plate (4) is fixedly connected to the lower pole (2). A PTC resistor strip (6) is fixedly connected between the two conductive plates (4). A bus bar (7) is fixedly connected to the bottom end of the lower pole (2). A fuse (5) is fixedly connected to the upper pole (1). The other end of the fuse (5) is fixedly connected to the conductive plate (3). The conductive plate (3) is fixedly connected to the lower pole (2). The bottom end of the conductive plate (3) is fixedly connected to the bus bar (7). A core is welded to the side of the bus bar (7) away from the conductive plate (3). The resistive heat dissipation assembly (8) includes multiple housings (81) and a heat-conducting strip (82). The bottom end of the heat-conducting strip (82) is fixedly connected to the upper surface of the PTC resistor strip (6). Multiple housings (81) are equidistantly installed on the top of the heat-conducting strip (82).

2. The high-safety power battery using a fuse and a PTC connected in parallel according to claim 1, characterized in that: Two partitions (83) are installed at equal intervals in the inner cavity of the housing (81). The two partitions (83) divide the inner cavity of the housing (81) into three parts: the installation cavity (831), the heat dissipation cavity one (832), and the heat dissipation cavity two (833). The bottom end of the inner cavity of the heat dissipation cavity two (833) is open.

3. A high-safety power battery using a fuse and a PTC connected in parallel according to claim 2, characterized in that: An electromagnet (84) is fixedly installed at the top of the inner cavity of the mounting cavity (831). A conductive wire (85) is fixedly connected to the input end of the electromagnet (84), and the other end of the conductive wire (85) is fixedly connected to the fuse (5).

4. A high-safety power battery using a fuse and a PTC connected in parallel according to claim 3, characterized in that: A liquid flow pipe (88) is fixedly connected to the bottom end of the partition (83) away from the middle. A plastic valve (881) is fixedly connected to the inner surface of the liquid flow pipe (88). An air flow pipe (882) is installed through the upper side of the inner surface of the second heat dissipation cavity (833). The other end of the air flow pipe (882) passes through the upper side of the outer surface of the housing (81) and extends into the upper side of the inner cavity of the first heat dissipation cavity (832).

5. A high-safety power battery using a fuse and a PTC connected in parallel according to claim 4, characterized in that: A guide rod (86) is fixedly connected to the axis of the two opposing surfaces of the partition (83). An annular iron block (87) is slidably installed on the outer surface of the guide rod (86). Four guide rods (861) are respectively installed in an annular array on the side of the opposing surfaces of the two partitions (83) away from the axis. A collar (871) is slidably installed on the outer surface of the four guide rods (861). The inner surface of the collar (871) at the axis is coaxially fixedly connected to the outer surface of the annular iron block (87). Four springs (862) are respectively sleeved on the outer surface of the four guide rods (861). The two ends of the four springs (862) abut against the collar (871) and the lowermost partition (83).

6. A high-safety power battery using a fuse and a PTC connected in parallel according to claim 5, characterized in that: Multiple heat dissipation fins (89) are equidistantly installed on the outer surface of the housing (81).

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