Battery with overload protection function

Abstract

The utility model discloses a battery with an overload protection function, which comprises a shell, a roll core and a cover plate, one end of the shell is provided with a negative electrode part, two ends of the roll core are respectively provided with a positive electrode lug and a negative electrode lug, the roll core is arranged in the shell, the negative electrode lug is connected with the negative electrode part, the cover plate covers the other end of the shell, and the positive electrode lug is connected with the negative electrode part. The cover plate comprises a positive current collecting disc, a positive pole part and a fuse link, one end of the positive current collecting disc is connected with the positive pole lug, an insulating ring sleeves the outer side of the positive current collecting disc, the insulating ring abuts against the inner wall of the shell, a sinking groove is formed in the other end of the positive current collecting disc, an isolating ring sleeves the inner wall of the sinking groove, the positive pole part is arranged in the sinking groove, and the fuse link is connected with the positive pole lug. The outer side of the positive electrode part abuts against the inner wall of the isolation ring, and the two ends of the fuse link are connected with the positive collector plate and the positive electrode part respectively. The utility model provides a battery with an overload protection function. A fuse link is arranged on a single battery to ensure whether the battery is overloaded and outputs current or not.

Description

Technical Field

[0001] The utility model relates to the field of power batteries, in particular to a battery with an overload protection function. Background Art

[0002] Existing electric vehicles generally use lithium batteries as power, and their battery assemblies are usually composed of many aluminum shell batteries. According to the different capacities of the battery assembly, the positive and negative electrodes of multiple aluminum shell batteries are connected in parallel to form a battery pack, and then multiple battery packs are connected in parallel or in series to form a battery assembly, thereby efficiently utilizing the charge and discharge of each aluminum shell battery.

[0003] In order to ensure the discharge safety of the battery assembly, a fuse is usually connected to the positive and negative poles of the battery assembly. When a short circuit or current overload occurs in the battery assembly, the fuse will blow in time to disconnect the battery assembly and prevent the battery assembly from overloading the output current.

[0004] However, the above-mentioned fuse is used to protect the battery assembly. Since the current output by the battery assembly is large, the overload output current of a single aluminum shell battery in the battery assembly cannot affect the melting of the fuse. When one of the aluminum shell batteries is continuously overloaded and discharged, the fuse cannot be short-circuited in time, which can easily cause damage to the aluminum shell battery or even explosion and affect the battery assembly. Utility Model Content

[0005] The utility model aims to provide a battery with an overload protection function, which ensures whether the battery outputs an overload current by arranging a fuse on a single battery.

[0006] The technical solution adopted by a battery with overload protection function disclosed in the utility model is:

[0007] It includes a shell, a winding core and a cover plate, one end of the shell is provided with a negative electrode part, the two ends of the winding core are respectively provided with a positive electrode ear and a negative electrode ear, the winding core is placed in the shell, the negative electrode ear is connected to the negative electrode part, the cover plate is covered on the other end of the shell, the cover plate includes a positive current collecting disk, a positive electrode part and a fuse, one end of the positive current collecting disk is connected to the positive electrode ear, an insulating ring is sleeved on the outer side of the positive current collecting disk, the insulating ring touches the inner wall of the shell, a sinking groove is opened at the other end of the positive current collecting disk, the inner wall of the sinking groove is sleeved with an insulating ring, the positive electrode part is placed in the sinking groove, the outer side of the positive electrode part touches the inner wall of the insulating ring, and the two ends of the fuse are respectively connected to the positive current collecting disk and the positive electrode part.

[0008] As a preferred embodiment, the positive electrode portion is a bowl-shaped structure, the opening of the bowl-shaped structure of the positive electrode portion faces the positive current collecting disk, a plurality of hollows arranged at intervals are provided on the positive electrode portion, a mounting groove is provided on the positive electrode portion, the mounting groove passes through the positive electrode portion, the fuse is placed in the bowl-shaped structure of the positive electrode portion, one end of the fuse is welded to the positive current collecting disk, and the other end of the fuse passes through the mounting groove and is welded to the positive electrode portion.

[0009] As a preferred solution, a plurality of positive welding grooves arranged at intervals are provided at the bottom of the sink, and a plurality of through holes arranged at intervals are provided on the positive electrode portion, wherein the through holes are located above the positive welding grooves.

[0010] As a preferred embodiment, an annular limiting groove is provided on the inner wall of the shell, the limiting groove is close to the other end of the shell, an annular limiting edge extends from the outer side of the positive collecting disk, the limiting edge is inserted into the limiting groove, and the isolating ring is located between the positive collecting disk and the shell.

[0011] As a preferred embodiment, a gasket is provided at one end of the winding core close to the positive electrode ear, and a high-temperature glue is sleeved on the gasket. The outer side of the high-temperature glue extends between the winding core and the shell, and the positive current collecting plate is sequentially penetrated by the high-temperature glue and the gasket and welded to the positive electrode ear.

[0012] As a preferred solution, a negative current collecting disk is provided at one end of the winding core, and the negative current collecting disk is welded to the negative electrode tab.

[0013] As a preferred embodiment, the negative electrode part is provided with a plurality of negative welding grooves arranged at intervals, the negative current collecting plate is welded to the negative electrode part, the negative electrode part is provided with a pressure relief groove, the negative electrode part is provided with a liquid injection hole, and a rivet is installed in the liquid injection hole.

[0014] The beneficial effects of a battery with overload protection function disclosed by the utility model are:

[0015] The winding core in the shell respectively conducts the positive current and the negative current through the positive electrode ear and the negative electrode ear, and the negative electrode ear is connected to the negative electrode part of the shell, so that the negative current is conducted from the negative electrode part of the shell; the positive electrode ear is connected to the positive current collecting disk of the cover plate, so that the positive current is directed to the positive current collecting disk, and the positive current collecting disk of the cover plate is isolated from direct contact with the shell by an insulating ring to prevent the positive current of the cover plate from being conducted with the shell, and the positive electrode part is placed in the sink groove at the other end of the positive current collecting disk, and the positive electrode part and the positive current collecting disk are blocked by an insulating ring to prevent the positive electrode part from directly contacting the positive current collecting disk to conduct current, and the two ends of the fuse are respectively connected to the positive current collecting disk and the positive electrode part, so that the positive current of the positive collecting disk can only be directed to the positive electrode part through the fuse, and the positive current is then conducted from the positive electrode part; when the battery is overloaded and discharged, the fuse heats up and melts, causing the positive current collecting disk to be disconnected from the positive electrode part, thereby protecting a single battery from overload operation, thereby avoiding damage to a single battery and affecting the entire battery assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a structural schematic diagram of a battery with an overload protection function.

[0017] Figure 2 The utility model is a schematic diagram of the structure of the negative electrode part of a battery with an overload protection function.

[0018] Figure 3 It is a partial cross-sectional view of a battery with an overload protection function of the utility model.

[0019] Figure 4 The utility model is a battery with overload protection function Figure 3 (A area) Enlarged image.

[0020] Figure 5 The utility model is a schematic diagram of the structure of various components of a battery cover with an overload protection function.

[0021] Figure 6 The utility model is a schematic diagram of the installation of a cover plate of a battery with an overload protection function. DETAILED DESCRIPTION

[0022] The present invention is further described and illustrated below in conjunction with specific embodiments and accompanying drawings:

[0023] Please refer to Figure 1-Figure 4 .

[0024] The utility model discloses a battery with an overload protection function, comprising a shell 1, a winding core 2 and a cover plate 3.

[0025] The shell 1 is a cylindrical body made of stainless steel by integral stamping. A negative electrode portion 11 is provided at one end of the shell 1. A plurality of negative welding grooves 111 arranged at intervals are provided on the negative electrode portion 11. In this embodiment, three negative welding grooves 111 are preferably provided. The three negative welding grooves 111 are arranged at intervals around the center of one end of the shell 1. This design can make the negative current collector welded to the negative electrode portion 11 more firmly. A liquid injection hole 112 is provided on the negative electrode portion 11. The liquid injection hole 112 is located at the center of one end of the shell 1. The liquid injection hole 112 passes through the shell 1. A rivet 113 is installed in the liquid injection hole 112. The liquid is injected into the shell through the liquid injection hole 112. The electrolyte is injected into the shell 1. When the electrolyte in the shell 1 is filled, a rivet 113 is installed in the injection hole 112 to achieve a sealing effect. A pressure relief groove 114 is provided on the negative electrode 11. In this embodiment, the pressure relief groove 114 is preferably annular and formed by stamping. The center of the pressure relief groove 114 is located at the center of one end of the shell 1. When the internal pressure of the battery is too high, the pressure relief groove 114 is the thinnest part of the wall thickness of the battery shell 1. The gas inside the shell 1 breaks through the pressure relief groove 114, and the gas inside the shell 1 is discharged from the crack of the pressure relief groove 114, reducing the risk of battery self-explosion. The other end of the shell 1 is provided with an opening, and a limit groove is provided on the inner wall of the shell 1, and the limit groove is close to the opening of the shell 1.

[0026] The winding core 2 is formed by stacking and winding a plurality of positive electrode sheets and a plurality of negative electrode sheets in sequence, wherein a diaphragm is provided between the positive electrode sheet and the negative electrode sheet, and the diaphragm separates the positive electrode sheet and the negative electrode sheet. Furthermore, continuous and regular positive electrode ears and negative electrode ears are cut out from one end of the positive electrode sheet and the second electrode sheet, respectively, and the positive electrode ears and the negative electrode ears are respectively located at the two ends of the winding core 2, and the positive electrode ears and the negative electrode ears are orderly kneaded and prostrated toward the center of the winding core 2 for easy installation and welding; a negative current collecting disk is provided at one end of the winding core 2, and the negative current collecting disk is welded to the negative electrode ear; one end of the negative electrode ear of the winding core 2 is inserted into the opening of the shell 1, and the winding core 2 is placed in the shell 1, and the negative current collecting disk touches the negative electrode part 11, and the negative current collecting disk is welded to the negative electrode part 11 by laser spot welding in the negative welding groove 111. A gasket 37 is provided at one end of the core 2 close to the positive electrode ear, and a high-temperature glue 36 is sleeved on the gasket 37. The outer side of the high-temperature glue 36 extends to between the core 2 and the shell 1; the high-temperature glue 36 can isolate part of the heat from being transferred to the core 2 when the fuse 35 is heated and melted, thereby preventing the core 2 from being affected by the external temperature. The gasket 37 can play a buffering role when installing the cover plate 3, thereby avoiding excessive pressure on the core 2 when installing the cover plate 3.

[0027] Please refer to Figure 3-Figure 6 .

[0028] The cover plate 3 includes a positive current collecting plate 31, a positive electrode portion 34 and a fuse 35. An annular limiting edge 311 extends from the outer side of the positive current collecting plate 31. An insulating ring 32 is sleeved on the outer side of the positive current collecting plate 31. The inner side of the insulating ring 32 fits the outer contour of the positive current collecting plate 31. The insulating ring 32 not only isolates the positive current collecting plate 31 from contact with the housing 1, but also has the function of sealing the gap between the cover plate 3 and the housing 1 to prevent the battery from leaking electrolyte. One end of the positive current collecting plate 31 is used to connect The positive electrode ear is connected, and a sink groove is provided at the other end of the positive current collecting disk 31. A plurality of positive welding grooves 312 arranged at intervals are provided at the bottom of the sink groove. In this embodiment, six positive welding grooves 312 are preferably provided, and the six positive welding grooves 312 are arranged at intervals around the center of the positive current collecting disk 31. This design can make the positive electrode ear welded to the positive current collecting disk 31 more firmly. An isolation ring 33 is sleeved on the inner wall of the sink groove. In this embodiment, the isolation ring 33 is preferably L-shaped in cross section, and the isolation ring 33 is made of insulating material.

[0029] In this embodiment, the positive electrode portion 34 is preferably a bowl-shaped structure, and the positive electrode portion 34 is placed in the sink. The bottom of the bowl of the bowl-shaped positive electrode portion 34 is used to connect an external wire to conduct current. The opening of the bowl-shaped structure of the positive electrode portion 34 faces the positive current collecting disk 31. A cavity is formed between the bowl-shaped structure of the positive electrode portion 34 and the sink of the positive current collecting disk 31. The outer side of the positive electrode portion 34 touches the inner wall of the isolation ring 33. The isolation ring 33 blocks the contact between the positive electrode portion 34 and the positive current collecting disk 31, so that the positive electrode portion 34 and the positive current collecting disk 31 are in a disconnected state. The positive electrode portion 34 is provided with A plurality of hollows 341 arranged at intervals allow outside air to enter the cavity of the positive electrode portion 34 through the hollows 341, thereby reducing the temperature of the positive electrode portion 34 when conducting current. A mounting groove 342 is provided on the positive electrode portion 34, and the mounting groove 342 runs through the positive electrode portion 34; a plurality of through holes 343 arranged at intervals are provided on the positive electrode portion 34. In this embodiment, six through holes 343 are preferably provided, and the six through holes 343 correspond to the six positive welding grooves 312, and the through holes 343 are long strips, and the through holes 343 are located above the positive welding grooves 312.

[0030] The fuse 35 is placed in the bowl-shaped structure of the positive electrode part 34. One end of the fuse 35 is welded to the positive current collecting plate 31, and the other end of the fuse 35 passes through the mounting groove 342 and is welded to the positive electrode part 34. The positive current collecting plate 31 guides the positive current to the positive electrode part 34 through the fuse 35, so that the positive electrode part 34 and the positive current plate enter a current conduction state; the welding area at both ends of the fuse 35 is larger than the cross-sectional area of ​​the middle part of the fuse 35. This design makes the welding contact area at both ends of the fuse 35 large and the resistance small. The cross-sectional area in the middle of the fuse 35 is small and the resistance is large. When the battery output When the current output is too large, the position where the resistor generates the highest temperature is located in the middle of the fuse 35, so that the position where the fuse 35 is blown is also located in the middle, so that the high temperature of the fuse 35 when it is blown is far away from the winding core 2 and the positive electrode part 34, and the hollow 341 opened in the positive electrode part 34 can allow air to enter the sink groove of the positive current collecting disk 31 to cool the fuse 35 after it is blown, thereby avoiding the temperature from accumulating in the cover plate 3; the fuse 35 after it is blown causes the positive current collecting disk 31 and the positive electrode part 34 to enter a disconnected state, thereby avoiding the battery from continuously overloading the output current and preventing the battery from exploding due to overload operation.

[0031] The cover plate 3 is covered on the other end of the shell 1, and the limiting edge 311 of the positive current collecting disk 31 is inserted into the limiting groove. The insulating ring 32 is located between the positive current collecting disk 31 and the shell 1. The insulating ring 32 prevents the positive current of the positive current collecting disk 31 from being directed to the shell 1 and causing a short circuit in the battery. One end of the positive current collecting disk 31 passes through the high-temperature glue 36 and the gasket 37 in sequence to touch the positive electrode ear, and is laser spot welded in the positive welding groove 312 through the through hole 343 to weld the positive electrode ear to the positive current collecting disk 31.

[0032] The utility model provides a battery with an overload protection function. The winding core in the shell respectively guides the positive current and the negative current through the positive pole ear and the negative pole ear. The negative pole ear is connected to the negative pole part of the shell, so that the negative current is guided from the negative pole part of the shell; the positive pole ear is connected to the positive current collecting disk of the cover plate, so that the positive current is guided to the positive current collecting disk. The positive current collecting disk of the cover plate is isolated from direct contact with the shell by an insulating ring to avoid the positive current of the cover plate being connected to the shell. The positive pole part is placed in a sink groove at the other end of the positive current collecting disk. The positive electrode part and the positive current collecting disk are blocked by an isolation ring to prevent the positive electrode part from directly contacting the positive current collecting disk and conducting current. The two ends of the fuse are respectively connected to the positive current collecting disk and the positive electrode part, so that the positive current of the positive current collecting disk can only be guided to the positive electrode part through the fuse, and the positive current is then conducted by the positive electrode part; when the battery is overloaded and discharged, the fuse heats up and melts, causing the positive current collecting disk to be disconnected from the positive electrode part, thereby protecting a single battery from overload operation, thereby avoiding damage to a single battery and affecting the entire battery assembly.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A battery with overload protection function, characterized in that: It comprises a shell, a winding core and a cover plate, wherein one end of the shell is provided with a negative electrode portion, and the two ends of the winding core are respectively provided with a positive electrode tab and a negative electrode tab, the winding core is placed in the shell, and the negative electrode tab is connected to the negative electrode portion; The cover plate is arranged on the other end of the shell, and the cover plate includes a positive current collecting disk, a positive electrode part and a fuse. One end of the positive current collecting disk is connected to the positive electrode ear, an insulating ring is sleeved on the outer side of the positive current collecting disk, and the insulating ring touches the inner wall of the shell. A sink groove is opened at the other end of the positive current collecting disk, and an insulating ring is sleeved on the inner wall of the sink groove. The positive electrode part is placed in the sink groove, and the outer side of the positive electrode part touches the inner wall of the insulating ring. The two ends of the fuse are respectively connected to the positive current collecting disk and the positive electrode part.

2. A battery with overload protection function as claimed in claim 1, characterized in that: The positive electrode part is a bowl-shaped structure, the opening of the bowl-shaped structure of the positive electrode part faces the positive current collecting disk, a plurality of hollows arranged at intervals are provided on the positive electrode part, a mounting groove is provided on the positive electrode part, the mounting groove passes through the positive electrode part, the fuse is placed in the bowl-shaped structure of the positive electrode part, one end of the fuse is welded to the positive current collecting disk, and the other end of the fuse passes through the mounting groove and is welded to the positive electrode part.

3. A battery with overload protection function as claimed in claim 2, characterized in that: The bottom of the sink is provided with a plurality of positive welding grooves arranged at intervals, and the positive electrode portion is provided with a plurality of through holes arranged at intervals, wherein the through holes are located above the positive welding grooves.

4. A battery with overload protection function as claimed in claim 3, characterized in that: An annular limiting groove is provided on the inner wall of the shell, and the limiting groove is close to the other end of the shell. An annular limiting edge extends from the outer side of the positive collecting disk, and the limiting edge is inserted into the limiting groove. The isolating ring is located between the positive collecting disk and the shell.

5. A battery with overload protection function as claimed in claim 4, characterized in that: A gasket is provided at one end of the winding core close to the positive electrode ear, and high-temperature glue is sleeved on the gasket. The outer side of the high-temperature glue extends between the winding core and the shell, and the positive current collecting plate passes through the high-temperature glue and the gasket in sequence and is welded to the positive electrode ear.

6. A battery with overload protection function as claimed in claim 5, characterized in that: A negative current collecting disk is provided at one end of the winding core, and the negative current collecting disk is welded to the negative electrode tab.

7. A battery with overload protection function as claimed in claim 6, characterized in that: The negative electrode part is provided with a plurality of negative welding grooves arranged at intervals, the negative current collecting plate is welded to the negative electrode part, the negative electrode part is provided with a pressure relief groove, the negative electrode part is provided with a liquid injection hole, and a rivet is installed in the liquid injection hole.

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