CN212434723U

CN212434723U - Metal shell button type lithium ion battery

Info

Publication number: CN212434723U
Application number: CN202021008562.8U
Authority: CN
Inventors: 邓亚西
Original assignee: Chongqing Zijian Electronic Co ltd
Current assignee: Chongqing Zijian Electronic Co ltd
Priority date: 2020-06-05
Filing date: 2020-06-05
Publication date: 2021-01-29
Anticipated expiration: 2030-06-05

Abstract

The utility model relates to the field of lithium batteries, and discloses a metal shell buckle type lithium ion battery, which comprises a metal shell, an electric core arranged in the metal shell, a terminal arranged outside the metal shell, and an insulating part arranged between the metal shell and the terminal and respectively insulated and sealed with the metal shell and the terminal, wherein the electric core is provided with at least one first tab which is electrically connected with the metal shell and has positive polarity or negative polarity, the electric core is also provided with at least one second tab which is electrically connected with the terminal and has negative polarity or positive polarity, the metal shell and the terminal are respectively sealed and connected with the insulating part in a heat sealing or bonding way, the utility model takes the metal shell as one polarity, takes the terminal as the other polarity, longitudinally observes the axial direction and the radial direction of the electric core, has smaller occupied space of the battery structure, and improves the energy density of the battery, the utility model has the advantages of simple structure, the reliability of seal is high and energy density is high, satisfies efficient production demand.

Description

Metal shell button type lithium ion battery

Technical Field

The utility model relates to a lithium cell field especially relates to a lithium ion battery is detained to metal-back.

Background

At present, when most battery manufacturers manufacture thin metal shell lithium secondary batteries, a shell outside a battery core adopts a circular metal shell, and the structure of the circular metal shell is divided into three layers: interior casing, shell body and sealing washer, consequently lithium ion battery among the prior art radially occupies more space volume, leads to the space of battery product can not make full use of diameter direction, consequently has the lower technical problem of the energy density of battery, wherein sealed R angle sealing technique that adopts between interior casing and the shell body, relies on the compression plastic sealing washer to realize sealing between it. However, the prior art measures the R angle not very accurately, so that the good sealing performance between the inner shell and the outer shell cannot be completely ensured, and the technical problems of low product reliability and low yield exist. In addition, the inner shell and the outer shell of the steel shell are respectively used as a positive electrode and a negative electrode, so that the problem of short circuit of a battery product is easy to occur.

In order to improve the above technical problems, in recent years, a new structure has been developed, that is, a similar structure of the current power aluminum-casing battery is adopted, as shown in fig. 1, a battery product in the prior art is adopted, which uses a single-layer metal casing 83 as a negative electrode, an aluminum cap 81 of another polarity is arranged on one side of the metal casing 83, an insulation processing manner between the metal casing 83 and the aluminum cap 81 is a riveted structure, and the greatest disadvantage of the riveted structure is that one side of the axial direction of the battery core has a five-layer structure: namely, the aluminum cap 81, the first insulating layer 82, the metal casing 83, the second insulating layer 84 and the rivet 85, the five-layer structure occupies too much space, usually more than 1mm, so that the battery product cannot fully utilize the axial space, and the energy density of the battery is low.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned defect among the prior art, provide a simple structure, the high and high metal-back knot formula lithium ion battery of energy density of sealing reliability.

In order to achieve the above object, the utility model provides a lithium ion battery is detained to metal casing, including metal casing, install at the inside electric core of metal casing, install the terminal in the metal casing outside, install between metal casing and terminal and respectively with metal casing and terminal insulation sealing's insulating part, be provided with on the electric core and be connected with the metal casing electricity and have positive polarity or at least one first utmost point ear of negative polarity, also be provided with on the electric core and be connected with the terminal electricity and have negative polarity or at least one second utmost point ear of positive polarity, the polarity of metal casing is opposite with the polarity of terminal, metal casing and terminal are respectively through heat seal or adhesive mode and insulating part sealing connection.

Preferably, the end face of the metal shell contacting with the insulating part and the end face of the terminal contacting with the insulating part are subjected to surface treatment of metal passivation or complexation.

Preferably, a first insulating layer is arranged between the second tab and the metal shell.

Preferably, a part of the end face of the second pole ear facing the metal shell is provided with a second insulating layer.

Preferably, the metal shell includes a metal shell and a cover plate disposed on one side of the metal shell and hermetically connected to the metal shell, the battery cell is disposed inside the metal shell, the first tab is electrically connected to the metal shell or the cover plate, and the terminal is disposed on the outer side of the cover plate or the metal shell and hermetically sealed with the cover plate or the metal shell through an insulating member.

Preferably, the inner or outer end face of the metal shell, the cover plate or the terminal is provided with a safety valve for discharging the internal over-high air pressure.

Preferably, the metal shell or the cover plate is provided with a liquid injection hole, and the outer side of the metal shell or the cover plate is provided with a cover plate for sealing the liquid injection hole.

Preferably, the inner side or the outer side of the cover plate is provided with a safety valve for discharging the internal over-high air pressure.

Preferably, the safety valve is a safety exhaust line with the functions of exhausting and relieving pressure.

Compared with the prior art, the beneficial effects of the utility model reside in that:

(1) the utility model discloses regard metal casing as one of them polarity, regard the terminal as another polarity, wherein metal casing and terminal are connected with insulating part sealing respectively through heat seal or adhesive mode, and it can guarantee to have very good leakproofness between terminal and the metal casing, prevents the electrolyte weeping, and the insulating part also guarantees well that the short circuit problem can not appear between metal casing and the terminal, has improved the qualification rate of battery product greatly;

(2) the radial direction of the battery is observed, and the outer side of the battery core is only provided with a single-layer metal shell, so the utility model greatly reduces the space occupied by the radial structure of the battery, and improves the energy density of the battery;

(3) in addition, the axial both sides of looking at electric core are indulged, wherein one side only has metal casing, because the utility model discloses what adopt between well metal casing and the terminal is not riveted structure, but realize the insulating sealing connection between metal casing and the terminal through insulating part heat seal or adhesive mode, consequently electric core axial opposite side from inside to outside is metal casing, insulating part and terminal in proper order, this side three-layer structure has reduced the battery greatly and has taken up the space at the ascending structure of axial, the energy density of battery has further been improved, the energy density of whole battery has improved more than 20%, moreover the utility model discloses the part is less, has simple structure and convenient assembling's advantage, has satisfied efficient production demand.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a battery product of the prior art provided in the background art;

fig. 2 is a schematic structural diagram of a first embodiment of the present invention;

fig. 3 is a schematic structural diagram of a second embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Example one

The utility model provides a metal-clad button type lithium ion battery, as shown in figure 2 for the cross-sectional schematic diagram of this battery, it includes metal casing 31, installs at the inside electric core 9 of metal casing 31, installs the terminal 6 in the metal casing 31 outside, installs between metal casing 31 and terminal 6 and respectively with metal casing 31 and terminal 6 insulation sealing's insulating part 5, be provided with on the electric core 9 and be connected with metal casing 31 electricity and have positive polarity or at least one first utmost point ear 10 of negative polarity, also be provided with on the electric core 9 and be connected with terminal 6 electricity and have negative polarity or at least one second utmost point ear 4 of positive polarity, the polarity of metal casing 31 is opposite with the polarity of terminal 6, metal casing 31 and terminal 6 are respectively through heat seal or adhesive mode and insulating part 5 sealing connection, wherein insulating part 5 is PP, PE, PEEK, Non-metallic materials such as PFA, nylon, or epoxy.

In the embodiment, the metal shell 31 is used as one polarity, the terminal 6 is used as the other polarity, wherein the metal shell 31 and the terminal 6 are respectively connected with the insulating member 5 in a sealing manner by heat sealing or adhesion, which can ensure that the terminal 6 and the metal shell 31 have very good sealing performance, prevent electrolyte leakage, and well ensure that no short circuit occurs between the metal shell 31 and the terminal 6, thereby greatly improving the qualification rate of battery products, more specifically, the end surface of the metal shell 31, which is in contact with the insulating member 5, and the end surface of the terminal 6, which is in contact with the insulating member 5, are subjected to surface treatment of metal passivation or complexation, and the surface treatment is performed on the terminal 6 and the metal shell 31, thereby being convenient for ensuring good sealing performance between the metal shell 31 and the insulating member 5, and between the terminal 6 and the insulating member 5.

In addition, the outer side of the battery cell 9 only has a single-layer metal shell 31 in the radial direction of the battery, so that the space occupied by the radial structure of the battery is greatly reduced, and the energy density of the battery is improved; in addition, looking at two axial sides of the battery cell 9, only the metal shell 31 is arranged on one side, because the metal shell 31 and the terminal 6 are not riveted, but are connected in an insulating and sealing manner through the insulating part 5 in a heat sealing or bonding manner, the metal shell 31, the insulating part 5 and the terminal 6 are sequentially arranged on the other axial side of the battery cell 9 from inside to outside, the space occupied by the battery in the axial direction is greatly reduced by the three-layer structure on the side, the energy density of the battery is further improved, the energy density of the whole battery is improved by more than 20%, and the battery has fewer parts, has the advantages of simple structure and convenience in assembly, and meets the requirement of efficient production.

In the embodiment, the metal shell 31 includes a metal shell 1, and a cover plate 2 disposed on one side of the metal shell 1 and hermetically connected to the metal shell 1, wherein the cover plate 2 is hermetically welded to the metal shell 1, the hermetic seal can well ensure the hermetic seal between the cover plate 2 and the metal shell 1, and can prevent the occurrence of battery leakage, wherein the battery cell 9 is disposed inside the metal shell 1, wherein the first tab 10 is electrically connected to the metal shell 1 or the cover plate 2, the embodiment preferably electrically connects the first tab 10 to the inside of the metal shell 1, the terminal 6 is disposed on the outside of the cover plate 2 or the metal shell 1 and is hermetically sealed with the cover plate 2 or the metal shell 1 through the insulating member 5, the embodiment preferably disposes the terminal 6 on the outside of the cover plate 2 and is hermetically sealed with the cover plate 2 through the insulating member 5, so that the end surface of the cover plate 2 contacting with the insulating member 5 is subjected to metal passivation or complexing, the good sealing performance between the cover plate 2 and the insulating part 5 is ensured, the sealing performance is good, and the phenomenon of battery leakage is avoided.

The first insulating layer 21 is arranged between the second pole lug 4 and the cover plate 2, the first insulating layer 21 can ensure that the second pole lug 4 and the cover plate 2 cannot form a short circuit, and the stability of a battery product is ensured, and certainly, the second insulating layer can also be arranged on the part of the end face, facing the cover plate 2, of the second pole lug 4, and can also prevent the second pole lug 4 and the cover plate 2 from forming a short circuit, and the stability of the battery product is ensured.

The inner side or outer side end face of the metal shell 1, the cover plate 2 or the terminal 6 is provided with a safety valve 3 for discharging the internal over-high pressure, in the embodiment, the inner side end face of the cover plate 2 is preferably provided with the safety valve 3 for discharging the internal over-high pressure, the safety of the battery can be improved by the arrangement of the safety valve 3, the service life of the battery is prolonged, in the embodiment, the safety valve 3 is preferably a safety exhaust wire with an exhaust and pressure relief function, when the battery is abused, or the battery is in short circuit or the battery generates heat, the internal pressure is easily too high, and at the moment, the internal gas breaks the safety wire to exhaust and.

In addition, the metal shell 1 or the cover plate 2 is provided with a liquid injection hole 7, in this embodiment, the cover plate 2 is preferably provided with the liquid injection hole 7, the liquid injection hole 7 can be sealed in a steel ball form or a rivet form, the outer side of the metal shell 1 or the cover plate 2 is provided with a cover plate 8 for sealing the liquid injection hole 7, and when the safety valve 3 is not arranged on the inner side or the outer side end face of the metal shell 1, the cover plate 2 or the terminal 6, the inner side or the outer side of the cover plate 8 can be provided with a safety valve 3 for discharging the internal overpressure.

The battery cell 9 may be a winding structure, or a laminated structure formed by stacking positive plates, diaphragms and negative plates in a continuous circulating order, wherein the diaphragms are made into a bag type and wrap the positive plates or the negative plates, the multiple positive plates are connected in parallel, and the multiple negative plates are connected in parallel.

Example two

The utility model provides another kind of metal-clad button lithium ion battery, it includes metal casing 31, as shown in fig. 3 is the cross-sectional schematic view of this battery, install the electric core 18 inside metal casing 31, install the terminal 15 in the metal casing 31 outside, install between metal casing 31 and terminal 15 and respectively with metal casing 31 and terminal 15 insulation sealing's insulating part 14, be provided with on the electric core 18 with metal casing 31 electricity be connected and have positive polarity or negative polarity at least one first utmost point ear 19, also be provided with on the electric core 18 with terminal 15 electricity be connected and have negative polarity or positive polarity at least one second utmost point ear 13, the polarity of metal casing 31 is opposite with the polarity of terminal 15, metal casing 31 and terminal 15 are respectively through heat seal or adhesive mode and insulating part 14 sealing connection, wherein insulating part 14 is PP, PE, Nonmetallic materials such as PEEK, PFA, nylon, or epoxy resin.

In the embodiment, the metal shell 31 is used as one polarity, the terminal 15 is used as the other polarity, wherein the metal shell 31 and the terminal 15 are insulated and sealed through the insulating member 14, which can ensure that the terminal 15 and the metal shell 31 have very good sealing performance, and also can ensure that the problem of short circuit between the metal shell 31 and the terminal 15 does not occur, thereby greatly improving the yield of battery products, and more specifically, the end surface of the metal shell 31, which is in contact with the insulating member 14, and the end surface of the terminal 15, which is in contact with the insulating member 14, are subjected to surface treatment of metal passivation or complexation, and the surface treatment is performed on the terminal 15 and the metal shell 31, so that good sealing performance between the metal shell 31 and the insulating member 14, and between the terminal 15 and the insulating member 14 is ensured.

In addition, the outer side of the battery core 18 only has a single-layer metal shell 31 in the radial direction of the battery, so that the space occupied by the radial structure of the battery is greatly reduced, and the energy density of the battery is improved; in addition, in a longitudinal view of two axial sides of the battery cell 18, only the metal shell 31 is arranged on one side, because the metal shell 31 and the terminal 15 in the embodiment are not in a riveted structure, but are in insulating sealing connection between the metal shell 31 and the terminal 15 in a heat sealing or bonding mode through the insulating part 14, the metal shell 31, the insulating part 14 and the terminal 15 are sequentially arranged on the other axial side of the battery cell 18 from inside to outside, the three-layer structure on the side greatly reduces the space occupied by the battery in the axial direction, the energy density of the battery is further improved, the energy density of the whole battery is improved by more than 20%, and the battery has fewer parts, has the advantages of simple structure and convenience in assembly, and meets the requirement of efficient production.

In the embodiment, the metal shell 31 includes a metal shell 12, and a cover plate 11 disposed on one side of the metal shell 12 and hermetically connected to the metal shell 12, wherein the cover plate 11 and the metal shell 12 are sealed by welding, the sealing can well ensure the sealing performance between the cover plate 11 and the metal shell 12, and avoid the occurrence of battery leakage, wherein the battery cell 18 is disposed inside the metal shell 12, wherein the first tab 19 is electrically connected to the metal shell 12 or the cover plate 11, the embodiment preferably electrically connects the first tab 19 to the inner side of the cover plate 11, the terminal 15 is disposed on the outer side of the cover plate 11 or the metal shell 12 and is hermetically sealed with the cover plate 11 or the metal shell 12 through the insulator 14, the embodiment preferably disposes the terminal 15 on the outer side of the metal shell 12 and is hermetically sealed with the metal shell 12 through the insulator 14, so that the end face of the metal shell 12 contacting with the insulator 14 is subjected to surface treatment of metal passivation or complexa, and good sealing performance between the metal shell 12 and the insulating part 14 is ensured, the sealing performance is good, and the phenomenon of battery leakage is avoided.

A first insulating layer 22 is arranged between the second tab 13 and the metal casing 12, the first insulating layer 22 can ensure that the second tab 13 and the metal casing 12 do not form a short circuit, and ensure the stability of the battery product, certainly, a second insulating layer can be arranged on a part of the end surface of the second tab 13 facing the metal casing 12, and can also prevent the second tab 13 and the metal casing 12 from forming a short circuit, and ensure the stability of the battery product.

The inner side or outer side end face of the metal shell 12, the cover plate 11 or the terminal 15 is provided with a safety valve 20 for discharging the internal excessive pressure, in this embodiment, the inner side end face of the cover plate 11 is preferably provided with the safety valve 20 for discharging the internal excessive pressure, the safety of the battery can be improved by the arrangement of the safety valve 20, and the service life of the battery is prolonged, in this embodiment, the safety valve 20 is preferably a safety vent wire with a vent and pressure relief function, when the battery is abused, or the battery is short-circuited or the battery generates heat, the internal pressure is easily too high, and at this time, the internal gas breaks the safety wire to vent and relieve the pressure.

In addition, the metal shell 12 or the cover plate 11 is provided with a liquid injection hole 16, in this embodiment, the metal shell 12 is preferably provided with the liquid injection hole 16, the liquid injection hole 16 can be sealed in a steel ball form or a rivet form, the outer side of the metal shell 12 or the cover plate 11 is provided with a cover plate 17 for sealing the liquid injection hole 16, and if the inner side or the outer side end face of the metal shell 12, the cover plate 11 or the terminal 15 is not provided with a safety valve 20, the inner side or the outer side of the cover plate 17 can be provided with a safety valve 20 for discharging the internal over-high air pressure.

The battery cell 18 may be a winding structure, or may be a laminated structure formed by stacking positive plates, diaphragms, and negative plates in a continuous circulating order, the diaphragms are made into a bag type, and wrap the positive plates or the negative plates, wherein multiple positive plates are connected in parallel, and multiple negative plates are connected in parallel.

The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.

Claims

1. The utility model provides a lithium ion battery is detained to metal-back, its characterized in that includes the metal casing, installs the electric core in the metal casing inside, installs the terminal in the metal casing outside, installs between metal casing and terminal and respectively with metal casing and terminal insulation sealing's insulating part, be provided with on the electric core with metal casing electricity be connected and have positive polarity or at least one first utmost point ear of negative polarity, also be provided with on the electric core with terminal electricity be connected and have negative polarity or at least one second utmost point ear of positive polarity, the polarity of metal casing is opposite with the polarity of terminal, metal casing and terminal are respectively through heat seal or adhesive mode and insulating part sealing connection.

2. The button lithium ion battery with metal shell as claimed in claim 1, wherein the end surface of the metal shell contacting the insulator and the end surface of the terminal contacting the insulator are surface treated by metal passivation or complexation.

3. The metal-can button lithium ion battery as claimed in claim 1, wherein a first insulating layer is disposed between the second tab and the metal can.

4. The metal-can button lithium ion battery according to claim 1, wherein a portion of the end surface of the second tab facing the metal can is provided with a second insulating layer.

5. The metal-clad button lithium ion battery according to claim 1, wherein the metal shell comprises a metal casing and a cover plate disposed on one side of the metal casing and hermetically connected to the metal casing, the cell is disposed inside the metal casing, the first tab is electrically connected to the metal casing or the cover plate, and the terminal is disposed outside the cover plate or the metal casing and hermetically sealed with the cover plate or the metal casing through an insulating member.

6. The button lithium ion battery with metal shell as claimed in claim 5, wherein the inner or outer end face of the metal shell, cover plate or terminal is provided with a safety valve for venting the internal over-high pressure.

7. The button lithium ion battery with metal can as claimed in claim 5, wherein the metal can or cover plate is provided with a liquid injection hole, and a cover plate for sealing the liquid injection hole is provided outside the metal can or cover plate.

8. The button lithium ion battery with metal can as claimed in claim 7, wherein the inside or outside of the cover is provided with a safety valve for venting the internal excess high pressure.

9. The lithium ion battery of any one of claims 6 or 8, wherein the safety valve is a safety vent line with venting and pressure relief functions.