A battery structure that facilitates pressure relief of hard shell battery cells

Abstract

The utility model provides a battery structure that is convenient for pressure relief of hard shell battery cores, comprising a shell and a pressure relief structure arranged on the shell, wherein the pressure relief structure comprises a pressure relief groove opened on the shell and a composite patch matched with the pressure relief groove. The battery structure that is convenient for pressure relief of hard shell battery cores of the utility model enables pressure relief in time when the battery is bloated to avoid a series of safety problems caused by failure to relieve pressure in time, and the pressure relief method has low processing difficulty and good consistency.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion batteries, in particular to a battery structure which is convenient for pressure relief of a hard shell battery core. Background Art

[0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, environmental friendliness, and no memory effect. They are widely used in mobile communications or digital products such as mobile phones, portable computers, digital cameras, and portable music players.

[0003] Hard-shell batteries have a higher energy density due to their thinner shell material and smaller packaging area. Hard-shell cells also have better packaging reliability and cell size consistency, and are currently receiving more and more attention. However, the shell strength of hard-shell cells is relatively high, and when the cell experiences thermal runaway, the internal gas cannot be discharged, and the internal gas pressure of the battery increases, posing a hidden danger.

[0004] The existing method of decompression of hard-shell batteries is to carve an explosion-proof valve on the shell, with the depth of the engraved line less than the thickness of the shell material, to create a weak area in the shell. When the internal pressure of the battery increases due to inflation, the weak area will rupture first, causing the pressure to leak slowly to prevent sudden pressure release and explosion. As a result, there are the following disadvantages: (1) The weak area is a thinned metal shell, and the metal itself has a high material strength, so the pressure required for leakage is relatively high. When the pressure value is reached, the pressure cannot be released in time and an explosion may occur; (2) Due to reasons such as metal material or processing method, the pressure relief value of the explosion-proof line cannot be stable; (3) The explosion-proof engraved line depth consistency requirements are high, and the processing is difficult. Utility Model Content

[0005] In order to overcome the deficiencies of the above-mentioned prior art, the utility model provides a battery structure that is convenient for decompression of hard shell battery cells, so that the pressure can be released in time when the battery is swollen to avoid a series of safety problems caused by the failure to release the pressure in time, and the pressure relief method has low processing difficulty and good consistency.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solution: a battery structure that is convenient for pressure relief of hard shell battery cells, including a shell and a pressure relief structure arranged on the shell, the pressure relief structure including a pressure relief groove opened on the shell and a composite patch matching the pressure relief barrel groove.

[0007] Furthermore, the pressure relief groove and the composite patch are thermally composited, extruded or bonded to form a sealed space.

[0008] Furthermore, the pressure relief groove is prepared by lathe processing, mechanical stamping, and laser engraving.

[0009] Furthermore, the depth of the pressure relief groove is greater than 90% of the wall thickness.

[0010] Furthermore, the shape of the pressure relief groove is straight line, circular or arc.

[0011] Furthermore, the pressure relief groove is arranged at any position on the front and back surfaces or the side wall of the shell.

[0012] Furthermore, the size of the composite patch is larger than the pressure relief groove.

[0013] Furthermore, the material of the composite patch is any one of PP, PET, and PFA.

[0014] Furthermore, the composite patch is arranged on the inner side or the outer side of the pressure relief groove.

[0015] Furthermore, the shape of the battery structure is any one of square, circular, and L-shaped.

[0016] In summary, the beneficial effects of the utility model are:

[0017] The utility model discloses a battery structure which is convenient for pressure relief of a hard shell battery cell. The pressure relief is achieved by cooperation of a pressure relief through groove arranged on the shell and a matching composite patch. When the battery is swollen and generates a certain pressure, the composite patch at the through groove is promptly ruptured, and the inside and outside of the battery are connected through the through groove on the shell, so as to achieve the purpose of timely pressure relief and avoid a series of safety problems caused by failure to timely relieve pressure.

[0018] The utility model provides a battery structure that facilitates pressure relief for hard-shell batteries, wherein the depth of the pressure relief groove is greater than 90% of the wall thickness, and the size of the composite patch is greater than the pressure relief groove to achieve a complete covering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the matching relationship between the shell and the pressure relief structure of the battery structure for facilitating the pressure relief of the hard shell battery core of the utility model;

[0020] Figure 2 is a schematic diagram of a pressure relief structure according to an embodiment;

[0021] Figure 3 is a schematic diagram of a pressure relief structure according to another embodiment;

[0022] Figure 4 is a schematic diagram of a pressure relief structure according to another embodiment;

[0023] Figure 5 A schematic diagram of a battery structure that facilitates pressure relief of a hard-shell battery cell according to an embodiment;

[0024] Figure 6 A schematic diagram of a battery structure for facilitating pressure relief of a hard-shell battery cell according to another embodiment;

[0025] Figure 7 A schematic diagram of a battery structure for facilitating pressure relief of a hard-shell battery cell according to another embodiment.

[0026] Legend

[0027] Shell 1, pressure relief valve through hole 2, composite patch 3, pressure relief structure 4. Implementation

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See also Figure 1 and Figure 5 The utility model discloses a battery structure that is convenient for pressure relief of hard shell battery cells, including a shell 1 and a pressure relief structure 4 arranged on the shell, wherein the pressure relief structure includes a pressure relief groove 2 opened on the shell and a composite patch 3 matching the pressure relief groove. Specifically, the pressure relief method is completed by the pressure relief groove arranged on the shell and the matching composite patch ( Figure 1 ), when the battery is swollen and generates a certain pressure, the composite patch at the through groove ruptures in time, and the inside and outside of the battery are connected through the through groove on the shell, so as to achieve the purpose of timely pressure relief.

[0030] In one embodiment, the pressure relief groove and the composite patch are bonded together by thermal bonding, extrusion, gluing, etc. to form a sealed space.

[0031] In one embodiment, the pressure relief groove is made by lathe processing, mechanical stamping, laser engraving, etc.

[0032] In one embodiment, the depth of the pressure relief groove is greater than 90% of the wall thickness.

[0033] In one embodiment, the shape of the pressure relief groove is straight line, circular, arc, etc. ( Figure 2 , Figure 3 , Figure 4 ).

[0034] In one embodiment, the pressure relief groove can be arranged at any position on the front or back surface or the side wall of the shell.

[0035] In one embodiment, the size of the composite patch is larger than the pressure relief groove to achieve a complete covering effect.

[0036] In one embodiment, the composite patch is made of PP, PET, PFA, etc.

[0037] In one embodiment, the composite patch is disposed inside or outside the pressure relief groove.

[0038] In one embodiment, the battery structure may be in a square, circular, L-shaped or other special-shaped battery structure. Example

[0039] The first step is to open a circular pressure relief hole on the side wall of the hard shell battery cell by using a mold stamping method;

[0040] In the second step, the circular composite patch and the pressure relief through hole on the side wall are bonded together by thermal bonding to form a pressure relief structure 4 ( Figure 2 ).

[0041] In the third step, the frame including the pressure relief structure 4 is assembled with the battery cell to form a complete hard shell battery ( Figure 5 ). Example

[0042] The first step is to open a linear pressure relief through hole on the side wall of the hard shell battery cell by lathe processing;

[0043] In the second step, the long strip composite patch and the pressure relief through hole on the side wall are bonded together by thermal bonding to form a pressure relief structure 4 ( Figure 3 ).

[0044] In the third step, the frame including the pressure relief structure 4 is assembled with the battery cell to form a complete hard shell battery ( Figure 6 ). Example

[0045] The first step is to open an arc-shaped pressure relief through hole on the cover plate of the hard shell battery cell by laser engraving;

[0046] In the second step, the arc-shaped composite patch and the pressure relief through hole on the side wall are bonded together by thermal bonding to form a pressure relief structure 4 ( Figure 4 ).

[0047] In the third step, the frame including the pressure relief structure 4 is assembled with the battery cell to form a complete hard shell battery ( Figure 7 ).

[0048] The utility model discloses a battery structure which is convenient for pressure relief of a hard shell battery cell. The pressure relief is achieved by cooperation of a pressure relief through groove arranged on the shell and a matching composite patch. When the battery is swollen and generates a certain pressure, the composite patch at the through groove is promptly ruptured, and the inside and outside of the battery are connected through the through groove on the shell, so as to achieve the purpose of timely pressure relief and avoid a series of safety problems caused by failure to timely relieve pressure.

[0049] The utility model provides a battery structure that facilitates pressure relief for hard-shell batteries, wherein the depth of the pressure relief groove is greater than 90% of the wall thickness, and the size of the composite patch is greater than the pressure relief groove to achieve a complete covering effect.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery structure that facilitates pressure relief of hard-shell battery cells, characterized in that: It comprises a shell and a pressure relief structure arranged on the shell, wherein the pressure relief structure comprises a pressure relief groove opened on the shell and a composite patch matching the pressure relief groove; the pressure relief groove and the composite patch form a sealed space by thermal compounding, extrusion or gluing; the pressure relief groove is prepared by lathe processing, mechanical stamping and laser engraving; the depth of the pressure relief groove is greater than 90% of the wall thickness; the shape of the pressure relief groove is straight line, circular or arc; the pressure relief groove is arranged at any position on the front and back sides or side walls of the shell; the size of the composite patch is larger than the pressure relief groove; the material of the composite patch is any one of PP, PET and PFA; the composite patch is arranged on the inside or outside of the pressure relief groove; the shape of the battery structure is any one of square, circular and L-shaped.

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