Short circuit prevention structure of square battery

Abstract

The utility model discloses a short circuit prevention structure of a square battery, which comprises a battery assembly, a shell is arranged outside the battery assembly, and a cylinder capable of preventing the battery from expanding and short circuit is arranged in the shell; when the internal pressure of the battery is abnormally increased due to charging and discharging processes or other factors, such as short circuit, overcharge and the like, the battery assembly expands, the two ends of the shell can preliminarily inhibit the expansion rate, the expansion position of the battery is transferred to the two sides of the battery assembly, the positive pole lug is connected with the top of the column body, and the top column is in an outward conical shape, so that the battery assembly is not damaged. The two sides of the battery assembly expand to exert pressure on the column body in the top groove column, the column body moves upwards, the displacement of the column body drives the positive plate tab connected with the column body to enable the positive plate tab to be separated from other parts of the current loop, so that the current of the battery is cut off, and the effect of preventing the short circuit of the battery is achieved; and the jacking column is reset under the driving of the spring, so that the battery can be continuously and normally used.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, especially relate to a square battery's short circuit prevention structure. BACKGROUND

[0002] Square battery has been widely applied in electric automobile, energy storage system and other fields due to its high energy density, high safety and easy modularization characteristics, when the square battery accidentally uses the mismatched charger to charge, due to the mismatch of current or voltage, the abnormal reaction starts to produce in the battery, these reactions can include the rapid decomposition of electrolyte, the falling of electrode material or the rapid rise of battery internal temperature, with the intensification of reaction, the battery internal can start to produce a large amount of gas, such as hydrogen, oxygen and the like, these gases fail to discharge in time, will lead to the rapid rise of battery internal pressure, under the action of high pressure, the diaphragm between the positive and negative poles of the battery can be damaged, leads to the direct contact of positive and negative poles, when the positive and negative poles of the battery directly contact, will form short circuit, short circuit can lead to the rapid increase of battery internal current, produces a large amount of heat, these heat will further intensify the reaction in the battery, forms a vicious cycle, can cause the explosion of battery, causes the safety accident, in view of this, a square battery's short circuit prevention structure is proposed. SUMMARY

[0003] In order to solve at least one of the above technical defects, the utility model provides a square battery's short circuit prevention structure, square battery includes battery assembly, the outer shell of battery assembly is provided, the outer shell is provided with the cylinder that can prevent the short circuit of battery expansion.

[0004] Further, the cylinder is conical, and the bottom of the cylinder is semicircular, the top of the battery assembly is provided with a negative pole lug piece, and the positive pole lug piece is arranged on one side of the negative pole lug piece.

[0005] Further, the bottom of the positive pole lug piece is connected with the top of the cylinder, and the cylinder is provided with a smaller outer diameter at the lower part than the upper part, the inner wall of the outer shell is provided with a semicircular top column groove, and the cylinder is inserted into the top column groove.

[0006] Further, the bottom of the cylinder is further provided with a matched spring, and the both ends of the outer shell are provided with an array of heat dissipation slots.

[0007] Beneficial effect: when the internal pressure of the battery is abnormally increased due to charging, discharging process or other factors such as short circuit, overcharge and the like, the battery assembly expands, and the two ends of the shell can preliminarily inhibit the expansion rate, so that the position of the battery expansion is transferred to the two sides of the battery assembly, and the positive tab is connected with the top of the column, and because the top column is outwardly conical, the expansion of the two sides of the battery assembly will exert pressure on the column in the top column, so that the column is displaced upward, the displacement of the column will drive the positive tab connected with the column to be out of contact with other parts of the current loop, thereby cutting off the current of the battery, so as to prevent the short circuit of the battery, and when the battery stops expanding and shrinks, the top column is reset under the driving of the spring, so that the battery can continue to be used normally.

[0008] The purpose, functional features and advantages of the utility model will be further explained in combination with embodiments and with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0009] Fig. 1 It is a whole structure schematic diagram of the utility model.

[0010] Fig. 2 It is a whole structure schematic diagram of the utility model.

[0011] Fig. 3 It is a shell structure schematic diagram of the utility model.

[0012] In Figs. 1 to 3 , the corresponding relationship of component name or line with drawing number is as follows: shell 1, heat dissipation slot 101, top column slot 102, battery assembly 2, negative tab 201, positive tab 202, column 203, spring 204. DETAILED DESCRIPTION

[0013] Please refer to Figs. 1 to 3 ;

[0014] The embodiment provides a short circuit prevention structure of square battery, and the square battery comprises a battery assembly 2, an outer shell 1 is arranged outside the battery assembly 2, and a column 203 capable of preventing battery expansion short circuit is arranged in the outer shell 1. Figs. 1 to 3 , the column 203 is conical, the bottom of the column 203 is semicircular, a negative tab 201 is arranged at the top of the battery assembly 2, a positive tab 202 is arranged on one side of the negative tab 201, the bottom of the positive tab 202 is connected with the top of the column 203, the column 203 is arranged in a mode that the outer diameter of the lower part is smaller than that of the upper part, a semicircular top column slot 102 is arranged on one side of the inner wall of the outer shell 1, the column 203 is inserted into the top column slot 102, a matched spring 204 is further arranged at the bottom of the column 203, and the two ends of the outer shell 1 are both provided with arrayed heat dissipation slots 101.

[0015] In specific embodiments, in the battery production process, the effect of the reinforcing structure design is tested by means of pressing from the inside of the shell. Experimental data show that the reinforcing structure design can significantly reduce the deformation of the battery under pressure. For example, under 0.3Mpa pressure, the deformation of the battery with the reinforcing structure can be reduced by more than 20%. Moreover, the excessive temperature inside the battery is one of the important factors leading to battery swelling. The heat dissipation efficiency of the battery assembly 2 when heating can be further improved by increasing the heat dissipation efficiency of the heat dissipation slots 101 at both ends of the shell 1, which can further improve the service life of the battery. When the internal pressure of the battery abnormally rises due to charging, discharging process or other factors such as short circuit, overcharge, etc., the battery assembly 2 swells, and the two ends of the shell 1 can preliminarily inhibit the swelling rate, so that the swelling position of the battery assembly 2 shifts to both sides. The positive tab 202 is connected to the top of the column 203, and due to the outward conical shape of the top column 203, the swelling of the battery assembly 2 on both sides will exert pressure on the column 203 in the top slot column 102, causing the column 203 to displace upward. The displacement of the column 203 will drive the positive tab 202 connected thereto to disengage from contact with other parts of the current loop, thereby cutting off the current of the battery to prevent short circuit of the battery. At the same time, when the battery assembly stops swelling and contracts, the top column 203 is reset under the drive of the spring 204, so that the battery can continue to be used normally, further improving the practicality of the battery.

Claims

1. A short-circuit prevention structure for a square battery including a battery assembly (2) provided with a case (1) on the outside thereof, characterized by: The shell (1) is internally provided with a column (203) capable of preventing battery swelling short circuit; The column (203) is conical, the bottom of the column (203) is semicircular, the top of the battery assembly (2) is provided with a negative tab (201), and one side of the negative tab (201) is provided with a positive tab (202); One side of the bottom of the positive tab (202) is connected with the top of the column (203), the column (203) is provided with a smaller outer diameter at the lower part than at the upper part, one side of the inner wall of the shell (1) is provided with a semicircular top column groove (102), and the column (203) is insertedly arranged in the top column groove (102); The bottom of the column (203) is further provided with a matched spring (204), and both ends of the shell (1) are provided with arrayed heat dissipation grooves (101).

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