JP2022065131A - Polar assembly, battery cell, and electrical equipment - Google Patents

Abstract

To provide a pole assembly, a battery cell, and electrical equipment that can improve a current situation in which a battery cell is unable to expel internal gas quickly at temperatures above a certain temperature.SOLUTION: A pole assembly 300 includes a pole column, a thermally deformable member, and a fixture, and is applied to a battery cell 1. Here, the thermally deformable member is provided so as to surround a pole pillar and is fixed to the pole pillar. The fixture is provided so as to surround the thermally deformable member through a through hole, and is fixed to the thermally deformable member. The thermally deformable member is configured to deform when the temperature exceeds a predetermined threshold value, and to form a pressure relief passage communicating with both ends of the through hole in the through hole. When the pole assembly is applied to the battery cell, the thermally deformable member inside the pole assembly deforms when the temperature of the battery cell exceeds a predetermined threshold, and further forms a pressure relief passage in the through hole of the fixture, and discharges the gas in the battery cell 1 to the outside.SELECTED DRAWING: Figure 1

Description

Embodiments of the present invention relate to the field of battery technology, in particular to pole assembly, battery cells, and electrical equipment.

A battery cell is a device that converts external energy into electrical energy, stores it inside the battery cell, and supplies power to an external device such as a portable electronic device at a required timing. Currently, batteries are widely used in electronic products such as mobile phones, tablets, and notebook computers.

Battery cells can constantly generate heat during high temperature conditions or short circuits, the heat inside the battery cells can be constantly accumulated, and further thermal runaway can generate high temperature and high pressure gas inside, such gas. If the battery is not discharged immediately, it may cause a safety accident such as an explosion due to swelling. Therefore, at present, it is necessary to provide a battery cell capable of discharging the gas when the temperature of the battery cell becomes higher than a predetermined temperature, and to complete the safety performance of the battery cell.

It is an object of the present invention to provide a pole assembly, a battery cell, and electrical equipment to improve the current situation in which a current battery cell cannot rapidly discharge internal gas at a temperature exceeding a specific temperature. do.

In the embodiment of the present application, the following measures have been taken in order to solve the above technical problems.

A pole assembly applied to a battery cell, comprising a pole, a thermally deformable member, and a fixture. Among them, the heat deforming member is provided so as to surround the pole pillar, is provided so as to surround the pole pillar, and is fixed to the pole pillar. The fixture has a through hole, is provided so as to surround the heat deformable member through the through hole, and is fixed to the heat deformable member. When the temperature is higher than a predetermined threshold value, the thermally deformable member is deformed so that a pressure relief passage communicating with both ends of the through hole is formed in the through hole.

As a further improved aspect of the above aspect, the heat-deformable member is an insulating material, and the fixture is located between both ends of the heat-deformable member along the axial direction of the through hole.

As a further improvement of the above aspect, the fixture has a non-circular cross section perpendicular to the axial direction of the through hole.

As a further improved aspect of the above aspect, the first end of the pole pillar protrudes from the heat deforming member and the fixture along the axial direction of the pole pillar.

As a further improved aspect of the above aspect, a conductive terminal fixed to the first end is further provided, and the end face of the conductive terminal facing the pole pillar is larger than the end face of the pole pillar, and the pole pillar is formed. Completely cover.

As a further improvement of the above aspect, the end face has a rounded rectangle or a rectangle, and the difference between the width of the end face and the maximum linear dimension of the end face of the fixative is less than 4 mm.

As a further improvement of the above embodiment, the pole column contains metal and / or the heat-deformable member contains polyethylene, polypropylene, or polypropylene ethylene, and / or the fixture contains metal. Can be mentioned.

As a further improvement of the above embodiment, the heat deforming member melts or shrinks so that the pressure relief passage is formed in the through hole when the temperature is higher than a predetermined threshold value.

Another embodiment of the present application further provides a battery cell comprising a case and an electrode assembly, wherein the case has a containment cavity for accommodating the electrode assembly and is used in the external environment of the containment cavity and the battery cell. Each has an opening for communication. The battery cell further comprises any of the pole assembly described above. The fixture is attached to the opening, the first end of the pole is exposed to the outside environment, and the second end of the pole is electrically connected to the electrode assembly.

As a further improvement of the above aspect, the shape of the opening is configured to match the shape of the fixture.

A battery cell according to still another embodiment of the present application includes a case and an electrode assembly, wherein the case has a containment cavity for accommodating the electrode assembly, and the accommodating cavity and the external environment of the battery cell, respectively. There is an opening for communication. The battery cell further comprises a pole assembly. The pole assembly is attached to the opening and includes a pole and a thermally deformable member. The first end of the pole is exposed to the outside environment and the second end of the pole is electrically connected to the electrode assembly. The thermally deformable member is provided so as to surround the pole pillar, is provided so as to surround the pole pillar, and is located between the pole pillar and the inner wall of the opening.

Other embodiments of the present application further provide electrical equipment comprising any of the pole assembly described above, or any of the battery cells described above.

The beneficial effects of the present application are as follows. The pole assembly provided by embodiments of the present application applies to a battery cell comprising a pole, a thermally deformable member, and a fixator. Here, the heat deforming member is provided so as to surround the pole pillar, is provided so as to surround the pole pillar, and is fixed to the pole pillar. The fixture is provided with a through hole, and the fixture is covered with the heat-deformable member by the through-hole and is fixed to the heat-deformable member. The thermally deformable member is configured to be deformed so as to form a pressure relief passage communicating with both ends of the through hole in the through hole when the temperature is higher than a predetermined threshold value.

Compared to a battery cell currently on the market, the polar column assembly according to the embodiment of the present application deforms when the temperature of the battery cell exceeds a predetermined threshold when the heat deforming member inside the pole assembly is applied to the battery cell. Further, by forming a pressure relief passage in the through hole of the fixture, the gas in the battery cell can be discharged to the outside, and the safety risk of the battery cell explosion can be reduced. That is, the pole assembly provided by the embodiment of the present application can improve the current situation in which the current battery cell cannot rapidly discharge the internal gas when the temperature is higher than a specific temperature.

One or more embodiments are exemplified by the corresponding drawings, and these exemplary embodiments are not limiting the embodiments. Elements with the same reference numerals in the drawings indicate similar elements. Unless otherwise stated, drawings in drawings are not subject to proportional restrictions.

It is a unidirectional schematic cross-sectional view of the battery cell which concerns on one Embodiment of this application. FIG. 1 is a schematic cross-sectional view of a pole assembly in FIG. 1 in one direction. It is a figure which shows the projection in the other direction of the pole assembly in FIG. It is a schematic diagram of the electric facility which concerns on one Embodiment of this application.

Hereinafter, in order to facilitate understanding of the present application, the present application will be described in more detail by combining the accompanying drawings and specific embodiments. Note that when a part is described as "fixed" / "fixed" / "mounted" to another part, they may be directly present in the other part, or in between. There may be one or more intermediate media. When one component is described as "connected" to the other component, it may be directly connected to the other component, or there may be one or more intermediate media in between. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and similar expressions used herein are used for purposes of illustration only.

Unless otherwise defined, all technical and scientific terms used herein are synonymous with those commonly understood by those skilled in the art of the present application. The terms used herein are for purposes of describing specific embodiments only and are not intended to limit the present application. As used herein, the term "and / or" includes any and all combinations of one or more related listed items.

Also, the technical features of the different embodiments of the present application described below may be combined with each other as long as they do not constitute a conflict with each other.

As used herein, "mounting" includes fixing or restricting a part or device to a specific position or place by means of welding, screwing, fastening, gluing, or the like. The component or device may remain immobile at a particular location or location or may move within a limited range. The component or device may be removable or non-removable after being fixed or restricted to a particular location or location, and is not restricted in embodiments of the present application.

1 to 3 show a schematic cross-sectional view of the battery cell 1 according to the embodiment of the present invention, a schematic cross-sectional view along one direction of the pole pillar assembly, and a schematic projection diagram from the bottom to the top of the pole pillar assembly. .. The battery cell 1 includes a case 100, an electrode assembly 200, and a pole assembly 300. Here, inside the case 100, a housing cavity 101 is provided, and an opening 102 that communicates with the external environment of the housing cavity 101 and the battery cell 1 is provided. The electrode assembly 200 is housed in the housing cavity 101. The pole assembly 300 is attached to the opening 102, one end of which is electrically connected to the electrode assembly 200, and the other end of which is exposed to the outside environment to form an external terminal of the battery cell 1. Is.

As for the above case 100, as shown in FIG. 1, the case 100 has a flat rectangular parallelepiped shape as a whole, and an electrode assembly 200 and a storage cavity 101 for storing an electrolytic solution are provided inside the case 100. .. Further, the case 100 is further opened with an opening 102 for communicating the above-mentioned accommodation cavity 101 and the external environment of the battery cell 1. The opening 102 is used to attach the pole column assembly 300 described above. In this embodiment, the battery cell 1 is a steel shell battery cell, i.e., the case 100 is a steel shell, but in another embodiment of the present application, the battery cell 1 is a battery of another type of hard case. It may be a cell. For example, the case 100 may be another metal case such as an aluminum case.

As for the electrode assembly 200, as shown in FIG. 1, a first electrode sheet (not shown) and a second electrode sheet (not shown) housed in the housing cavity 101 and provided in a laminated manner are provided. ) And a separate film (not shown). Here, the first electrode sheet and the second electrode sheet have opposite polarities and are provided at intervals. One of the two electrode sheets is a positive electrode sheet, and the other electrode sheet is a negative electrode sheet. The separate film is placed between the two electrode sheets described above and is used to separate the two. The first electrode sheet, the second electrode sheet, and the separate film are laminated and arranged so as to be accommodated in the accommodation cavity 101, and are wound into a columnar structure having an oval cross section. The electrode assembly 200 in the present embodiment is a wound electrode assembly, but the present application is not limited thereto. In another embodiment of the present application, the electrode assembly 200 may be a laminated electrode assembly. The case 100 is further filled with an electrolytic solution, and the electrode assembly 200 is infiltrated with the electrolytic solution. The electrolytic solution provides an environment in which lithium ions are conducted, can store lithium ions in the first electrode sheet or the second electrode sheet in a timely manner, and realizes a charging / discharging process of the battery cell 1.

Regarding the above-mentioned pole pillar assembly 300, referring specifically to FIG. 1 with reference to FIGS. 2 and 3, the pole pillar assembly 300 is attached to the above-mentioned opening 102 and is thermally deformed with the pole pillar 310. The member 320 and the fixture 330 are included. Here, the heat deformation member 320 is provided so as to surround the pole pillar 310 and is fixed to the pole pillar 310. The fixture 330 is provided with a through hole 301. The fixture 330 is provided so as to surround the heat-deforming member 320 through the through hole 301, and is fixed to the heat-deformation member 320. The heat deformation member 320 is configured to be deformed so that when the temperature is higher than a predetermined threshold value, a pressure relief passage communicating with both ends of the through hole 301 is formed in the through hole 301. As a result, when the temperature of the battery cell 1 becomes higher than a predetermined threshold value, the high-pressure gas generated inside the battery cell 1 can be discharged to the outside environment of the battery cell 1 through the pressure relief passage, and eventually the battery cell 1 can be discharged. The risk of explosion of the battery cell 1 can be reduced or eliminated by avoiding swelling. The "predetermined threshold value" referred to in the present application is a temperature value at which the temperature of the battery cell 1 is exactly deformed so that the heat deforming member 320 is exactly deformed so that a pressure relief passage is formed in the through hole 301 of the fixture 330. It means to rise to. When the temperature of the battery cell is higher than a predetermined threshold, the pressure relief passage is already formed. The predetermined threshold value is a value of a temperature higher than the normal operating temperature of the battery cell 1 and lower than the thermal runaway temperature of the battery cell 1. That is, when the battery cell 1 is in the normal operating state, the battery cell 1 is at a temperature lower than a predetermined threshold value so that the pressure relief passage is not formed during the normal operation. When the battery cell 1 is in a thermal runaway state, the battery cell 1 is at a temperature higher than a predetermined threshold value in order to prevent the internal gas from being rapidly discharged from the battery cell 1 during the thermal runaway. In addition, the "deformation" referred to in the present application specifically includes a form of thermal melting and shrinkage.

The pole column 310 has a columnar shape made of a conductive material as a whole. In this embodiment, the pole column 310 contains a metal, but of course, in other embodiments of the present application, it may contain a conductive non-metal, or both a metal and a non-metal. You may. Along the axial direction of the pole column 310, its first end 311 exceeds the heat deforming member 320 and the fixture 330 and is exposed to the outside of the battery cell 1 to facilitate electrical connection with an external electrical load. To. The second end 312 enters the accommodation cavity 101 and is electrically connected to one electrode sheet of the electrode assembly 200 such that the poles 310 form one external terminal of the battery cell 1. .. Further, the other electrode sheet in the electrode assembly 200 is electrically connected to the case 100 so as to form the other external terminal of the battery cell 1 as the whole case 100. Here, the first end 311 and the second end 312 are both ends facing each other along the axial direction of the pole column 310.

The heat deformation member 320 is a core component of the pole pillar assembly 300 having the pressure relief function of the present application, has a cylindrical structure as a whole, is provided so as to surround the pole pillar 310, and is fixed to the pole pillar 310. There is. The above-mentioned tubular structure is not limited to a cylindrical shape, and may be a square tubular structure or a tubular structure having a polygonal cross section. Since the thermally deformable member 320 is made of a material having a relatively low melting point, deformation such as melting or shrinkage is likely to occur before the thermal runaway of the battery cell 1, and further, for letting gas escape into the through hole 301. It forms a pressure relief passage. In some embodiments, the normal operating temperature of the battery cell 1 is less than 100 ° C. and the thermal runaway temperature is 150 ° C. It is preferably made of a material having a melting point between 110 ° C. and 170 ° C. The heat-deformable member 320 is made of polyethylene, polypropylene, polypropylene ethylene, or a mixture of these materials.

The fixture 330 is a mounting / fixing component for the pole pillar assembly 300, has a cylindrical shape as a whole, and is provided with the above-mentioned through hole 301. The fixture 330 is fitted to the outer surface of the heat deforming member 320 via the inner wall of the through hole 301, and is attached to the opening 102 via the outer wall thereof. The heat deforming member 320, the pole column 310, and the fixture 330 are fixed by a hot melt connection. Of course, in another embodiment of the present application, the pole column 310, the heat deformation member 320, and the fixture 330 described above may be integrally molded by injection molding. Specifically, the pole column 310 and the fixture 330 are arranged as inserts in the injection molding die. The injection molding die injects the above-mentioned polyethylene (or polypropylene / polypropylene ethylene) to form the pole column assembly 300. In the present embodiment, the fixture 330 is made of metal, is fixed to the case 100 by welding, and is attached to the case 100, while the opening 102 is sealed. Preferably, the thermal deformation member 320 described above is an insulating material in order to prevent a short circuit between the positive and negative electrodes of the battery cell 1 due to the fixture 330 coming into contact with the pole column 310. At the same time, both ends of the fixture 330 are located between both ends of the heat deforming member 320 along the long axis direction of the through hole 301.

Preferably, in order to prevent the fixture 330 from rotating with respect to the case 100 and to prevent the fixing effect between the fixture 330 and the case 100 from being destroyed, the fixture 330 is provided with the above-mentioned through hole. The outline of the cross section perpendicular to the axis of 301 exhibits a non-circular shape, for example, a rectangle, a square, a rhombus, a pentagon, or the like. Correspondingly, the opening 102 matches the shape of the fixture 330. That is, the cross section is formed in a non-circular shape that matches the above-mentioned fixative 330. As described above, after the fixture 330 is attached to the opening 102, the inner wall of the opening 102 suitably prevents the fixture 330 from rotating, thereby achieving the above object. More preferably, in order to prevent the heat deforming member 320 from rotating with respect to the fixture 330 and further impairing the fixing effect between the heat deforming member 320 and the fixture 330, the through hole 301 of the heat deforming member 320 is prevented. The outer shell of the cross section perpendicular to the axial direction of was made non-circular. Correspondingly, the shape of the through hole 301 matches the heat deformation member 320. More preferably, in order to prevent the pole column 310 from rotating with respect to the heat deforming member 320 and further to prevent the fixing effect between the pole pillar 310 and the heat deformation member 320 from being destroyed, the through hole 301 of the pole pillar 310 is prevented. The outer shell of the cross section perpendicular to the axial direction of is non-circular. Correspondingly, the shape of the inner hole of the heat deforming member 320 matches the pole column 310.

Further, in order to increase the area where the pole assembly 300 can come into contact with the external load, the pole assembly 300 is further provided with a conductive terminal 340. Specifically, as shown in FIG. 2, the conductive terminal 340 has a flat plate-like structure and is fixed to the first end of the pole column 310. The conductive terminal 340 has two end faces 341 provided so as to face each other along the axial direction of the pole column 310. One end face 341 of the conductive terminal 340 toward the pole pillar 310 is larger than the end face of the pole pillar 310 and completely covers the pole pillar 310. That is, by providing the entire cross-sectional area of the conductive terminal 340 to be larger than the cross-sectional area of the pole pillar 310, the area for electrically connecting to the load in the pole pillar assembly 300 is effectively expanded. rice field. Further, since the first end 311 of the pole column 310 is provided beyond the heat deformation member 320 and the fixture 330 so as to have a certain gap between the conductive terminal 340 and the through hole 301, the battery cell is provided. When the gas in 1 is discharged, it can be smoothly discharged to the outside. The conductive terminal 340 may be integrally molded with the pole column 310 by a process such as caulking or cutting. In another embodiment of the present application, the conductive terminal 340 and the pole pillar 310 may be formed separately and fixed by welding or the like. Further, the end surface 341 of the conductive terminal 340 is a rectangle or a rounded rectangle. If the end face 341 of the conductive terminal 340 is too large, the head of the welding device enters the edge of the opening 102 and it becomes difficult to perform the welding process. Therefore, in the present embodiment, the width dimension of the end face 341 and the fixture 330 The difference from the maximum linear dimension of is less than 4 mm. That is, the dimension in which one side of the conductive terminal 340 exceeds the fixture 330 along the width direction of the end face 341 is less than 2 mm.

The battery cell 1 according to the embodiment of the present application includes a case 100, an electrode assembly 200, and a pole assembly 300. Among them, the pole column assembly 300 includes a pole pillar 310, a heat deforming member 320, and a fixture 330. The heat deforming member 320 and the fixture 330 are annularly provided on the outer periphery of the pole column 310 from the inside to the outside in this order. The heat deformation member 320 is configured to deform when the temperature becomes higher than a preset threshold value to form a pressure relief passage in the through hole 301 that communicates with both ends of the through hole 301.

Compared to a battery cell currently on the market, the thermally deformable member 320 inside the battery cell 1 according to the embodiment of the present application is deformed when the temperature of the battery cell exceeds a predetermined threshold value, and penetrates the fixture 330. By forming a pressure relief passage in the hole 301, the gas in the battery cell 1 can be discharged to the outside, and the safety risk of the battery cell explosion can be reduced. That is, the battery cell provided by the embodiment of the present application can improve the current situation in which the current battery cell cannot rapidly discharge the internal gas when the temperature is higher than a specific temperature.

In the above embodiment, the pole pillar assembly 300 of the battery cell 1 includes the pole pillar 310, the heat deforming member 320, and the fixture 330 at the same time, but the present application is not limited to this and is fixed. The tool 330 may be omitted. For example, in some other embodiments of the present application, the pole assembly in the battery cell 1 may include only the pole pillar and the thermally deformable member described above. In this case, the first end of the pole pillar is exposed to the outside of the case, the second end of the pole pillar enters the case, and the heat deforming member is provided so as to surround the pole pillar and the pole pillar and the inner wall of the opening. Located between. In this way, the battery cell including the pole assembly can improve the current situation in which the internal gas cannot be discharged in a timely manner when the temperature of the conventional battery cell becomes higher than a certain temperature.

Under the same invention, the present application further provides a pole assembly. As shown in FIGS. 1 to 3, the pole assembly has the same configuration as the pole assembly of the battery cell 1 in any of the above embodiments. When this pole assembly is applied to a battery cell, when the temperature of the battery cell exceeds a predetermined threshold, the heat deforming member inside it is deformed, and a pressure relief passage is formed in the through hole of the fixture. By releasing the gas inside the battery cell to the outside, the safety risk of the battery cell explosion can be reduced. That is, the pole assembly provided by the embodiment of the present application can improve the current situation in which the internal gas cannot be discharged in a timely manner when the temperature of the conventional battery cell becomes higher than a certain temperature.

Based on the same invention idea, the present application further provides the electric equipment 2 having the battery cell described in any one of the above-described embodiments. FIG. 4 shows the electrical equipment 2 according to the embodiment of the present application. In the present embodiment, the electric equipment 2 is a mobile phone, but in another embodiment, the electric equipment 2 may be a power-using device that needs to be driven by other electric power such as a tablet, a personal computer, or a drone.

Finally, the above embodiments are used only to illustrate the technical proposals of the present application and are not limiting. Under the technical ideas of the present application, the technical features of the above embodiments or different embodiments can be combined with each other and the steps can be realized in any order and of the different embodiments as described above. Many changes exist and are not provided in detail for brevity. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art may modify the technical proposals described in the above embodiments or replace some of the technical features equally. You should understand what you can do. However, the essence of the invention corresponding to these amendments or substitutions does not deviate from the scope of the present invention.

1 Battery cell 100 Case 101 Containment cavity 102 Opening 200 Electrode assembly 300 Pole pillar assembly 310 Pole pillar 311 1st end 312 2nd end 320 Thermal deformation member 330 Fixture 340 Conductive terminal 341 End face 301 Through hole

Claims (12)

A pole assembly applied to battery cells
A pole pillar, a heat-deformable member, and a fixture are provided, and the heat-deformer member is provided so as to surround the pole pillar and is fixed to the pole pillar.
The fixative has a through hole, is provided so as to surround the heat-deformable member through the through-hole, and is fixed to the heat-deformable member.
The polar deforming member is characterized in that when the temperature is higher than a predetermined threshold value, the heat deforming member is deformed so that a pressure relief passage communicating with both ends of the through hole is formed in the through hole. Pillar assembly. The polar column according to claim 1, wherein the heat-deformable member is an insulating material, and the fixture is located between both ends of the heat-deformable member along the axial direction of the through hole. assembly. The pole pillar assembly according to claim 1, wherein the fixture has a non-circular cross section perpendicular to the axial direction of the through hole. The pole pillar assembly according to claim 1, wherein the first end of the pole pillar protrudes from the heat deforming member and the fixture along the axial direction of the pole pillar. A claim comprising a conductive terminal fixed to the first end, wherein the end face of the conductive terminal facing the pole pillar is larger than the end face of the pole pillar and completely covers the pole pillar. Item 4. The pole column assembly according to item 4. The pole column assembly according to claim 5, wherein the end face has a rounded rectangle or a rectangle, and the difference between the width of the end face and the maximum linear dimension of the end face of the fixative is less than 4 mm. .. The first aspect of claim 1, wherein the pole column contains a metal and / or the thermally deformable member contains polyethylene, polypropylene, or polypropylene ethylene, and / or the fixture contains a metal. Polar pillar assembly. The polar column according to claim 1, wherein the thermally deformable member melts or contracts so that the pressure relief passage is formed in the through hole when the temperature is higher than a predetermined threshold value. assembly. The case comprises a case and an electrode assembly, the case having a containment cavity for accommodating the electrode assembly, and an opening communicating with the external environment of the accommodation cavity and the battery cell, respectively.
The battery cell further comprises the pole assembly according to any one of claims 1-8, the fixture is attached to the opening, and the first end of the pole is exposed to the outside environment. A battery cell characterized in that the second end of the pole is electrically connected to the electrode assembly. The battery cell according to claim 9, wherein the shape of the opening is configured to match the shape of the fixture. It ’s a battery cell,
The case comprises a case and an electrode assembly, the case having a containment cavity for accommodating the electrode assembly, and an opening communicating with the external environment of the accommodation cavity and the battery cell, respectively.
The battery cell further comprises a pole assembly, the pole assembly being attached to the opening and comprising a pole and a thermally deformable member, the first end of the pole being exposed to the outside environment. The second end of the pole column is electrically connected to the electrode assembly and
The battery cell is provided so as to surround the pole pillar and is located between the pole pillar and the inner wall of the opening. An electric facility comprising the pole pillar assembly according to any one of claims 1 to 8 or the battery cell according to any one of claims 9 to 11.

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