CN217934124U - Hard shell battery and battery module - Google Patents

Abstract

The utility model belongs to the technical field of lithium ion battery makes, concretely relates to crust battery and battery module, crust battery include shell, electric core, wire and sealing member. The shell comprises a first shell and a second shell, the first shell is connected with the second shell to form a closed cavity, and the first shell is provided with a lead-out hole; the battery cell is accommodated in the closed cavity, and a first tab is led out from one end of the battery cell; one end of the wire is electrically connected with the first pole lug, and the other end of the wire penetrates through the lead-out hole and is used for being electrically connected with an external circuit; the sealing element is fixed on the shell and used for sealing the leading-out hole. The hard-shell battery directly leads out a lead for welding with an external circuit, and replaces the existing pole, so that when the battery Pack is used, the lead does not need to be welded on the pole, and the lead can be directly connected with a circuit board, thereby reducing the manufacturing processes and equipment investment, and shortening the manufacturing period of the battery.

Description

Hard shell battery and battery module

Technical Field

The utility model belongs to the technical field of lithium ion battery makes, concretely relates to crust battery and battery module.

Background

Nowadays, with the rapid growth of population and the rapid development of social economy, the shortage of resources and energy sources is increasing, the environmental protection is increasingly emphasized, and the development and saving of energy sources become an important subject in the world today. Energy is the basis of existence and development of human society, and the current society based on fossil energy is increasingly frequently suffering from energy shortage and environmental pollution crisis. Meanwhile, with the coming of the information-oriented high-tech era, the energy application form is changing, and the demand of renewable, pollution-free, small-sized and discrete mobile high-performance power sources is rapidly increasing. Green, high-efficiency secondary batteries are being vigorously developed in various countries. The lithium ion battery as a novel secondary battery has the advantages of large energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like.

Common lithium ion battery includes soft shell battery and crust battery, and the shell of crust battery is aluminium, stainless steel or other metal material and makes, and the shell contains apron, casing and the utmost point post of installing at the apron, and utmost point post is used for carrying out the electricity with the inside electric core of shell and is connected to can circulate electric core and external circuit, and utmost point post can occupy the high space of battery, and in the battery manufacture process, utmost point post often exposes, makes the battery have the short circuit risk. In addition, when the battery Pack is used, the pole needs to be welded with a lead used for connecting a circuit board, the lead is thin, so that the manual welding efficiency is low, the manufacturing cost is increased, and if an automatic welding machine is developed, the equipment investment cost is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: aiming at the defects of the prior art, the hard shell battery and the battery module are provided, the hard shell battery is directly led out of a lead for being welded with an external circuit, and therefore when the battery Pack is used, the lead does not need to be welded, and the lead can be directly used for being connected with a circuit board, so that the investment of manufacturing processes and equipment is reduced, and the manufacturing period of the battery is shortened.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

in a first aspect, a hard-shell battery comprises:

the shell comprises a first shell and a second shell, the first shell is connected with the second shell to form a closed cavity, and the first shell or the second shell is provided with a lead-out hole;

the battery cell is accommodated in the closed cavity, and a first tab is led out from one end of the battery cell;

one end of the wire is electrically connected with the first tab, and the other end of the wire penetrates through the lead-out hole and is used for being electrically connected with an external circuit;

and the sealing element is fixed on the shell and used for sealing the leading-out hole.

Preferably, a second tab is led out from one end of the battery cell, the second tab is electrically connected with the housing, the second tab and the first tab are led out from the same end of the battery cell, or the second tab and the first tab are led out from different ends of the battery cell.

Preferably, one end of the wire is welded with the first tab, and the welding position and the first tab are covered with a layer of protective glue.

Preferably, the wire comprises a metal conductor and an insulating sheath wrapping the metal conductor.

Preferably, the sealing member includes a pillar portion and a base portion disposed at least one end of the pillar portion, the base portion and the pillar portion are integrally formed, the pillar portion is accommodated in the lead-out hole, the diameter of the base portion is larger than that of the lead-out hole, the base portion is disposed on the inner side and/or the outer side of the housing, the base portion and the pillar portion are both provided with avoiding holes, and the lead passes through the avoiding holes.

Preferably, the first housing is a disc-shaped structure, the lead-out hole penetrates through the upper surface and the lower surface of the first housing, and the sealing element is bonded to the first housing.

Preferably, the second casing includes diapire and lateral wall, and the lateral wall sets up in the edge of diapire, and the second casing is closed to first casing lid, and first casing and lateral wall welding, draws forth the upper surface and the lower surface that the hole runs through the diapire, and the sealing member bonds in the diapire.

Preferably, the side wall of the second shell is provided with a step, and the first shell is in clearance fit or interference fit with the step.

Preferably, the housing is provided with an explosion-proof line.

In a second aspect, a battery module includes the hard-shell battery of the first aspect.

The beneficial effects of the utility model reside in that: this application is connected through the first utmost point ear electricity of drawing forth the one end of wire and electric core one end, wears out the hole of drawing forth of shell with the other end of wire again, makes electric core carry out the electricity through wire and external circuit and connects. Carry out the electricity for prior art electric core through utmost point post and external circuit and be connected, the electric core of this application carries out the electricity through the wire and is connected with external circuit, has saved utmost point post, consequently first utmost point ear is direct to be welded with the wire, has reduced the welding degree of difficulty. When the shell is provided with the pole, the battery leaves a larger space for installing the pole and welding the pole and the pole lug, so that the energy density of the battery is reduced, and the space required by a wire is smaller. Meanwhile, the lead has good flexibility, can be bent at various angles well, and cannot be broken in the bending process, so that the lead is better suitable for various use occasions. Compared with the pole needing to be processed, the lead is easy to obtain and low in price. In addition, because the hard-shell battery directly leads out a lead for welding with an external circuit, the lead can be directly used for connecting a circuit board during battery Pack, so that a pole is not required to be welded with the lead, the investment of automatic welding equipment is reduced, and the manufacturing period of the battery is shortened.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of a hard-shell battery according to embodiment 1 of the present invention.

Fig. 2 is a schematic perspective view of a hard-shell battery according to embodiment 1 of the present invention.

Fig. 3 is a cross-sectional view of a lead wire according to embodiment 1 of the present invention.

Fig. 4 is a cross-sectional view of a wire according to embodiment 1 of the present invention.

Fig. 5 is a schematic perspective view of a sealing member according to embodiment 1 of the present invention.

Fig. 6 is a plan view of a second housing according to embodiment 1 of the present invention.

Fig. 7 is a schematic structural view of a hard-shell battery according to embodiment 2 of the present invention.

Fig. 8 is a schematic structural view of a hard-shell battery according to embodiment 3 of the present invention.

Fig. 9 is a schematic structural view of a hard-shell battery according to embodiment 4 of the present invention.

Fig. 10 is a schematic structural view of a hard-shell battery according to embodiment 5 of the present invention.

Fig. 11 is a schematic perspective view of a sealing member according to embodiment 5 of the present invention.

Wherein the reference numerals are as follows:

1-a housing; 11-a first housing; 12-a second housing; 121-bottom wall; 122-a side wall; 123-step; 13-leading out hole; 14-explosion-proof lines;

2-electric core; 21-a first tab; 22-a second tab;

3-a wire; 31-a metal conductor; 32-an insulating skin;

4-a seal; 41-a pillar portion; 42-a base portion; 43-avoiding hole.

Detailed Description

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The present invention will be described in further detail with reference to the accompanying drawings, but the present invention is not limited thereto.

Example 1

As shown in fig. 1 to 6, the hard-shell battery of the present embodiment includes a case 1, a battery core 2, a lead 3, and a sealing member 4. The shell 1 comprises a first shell 11 and a second shell 12, the first shell 11 is connected with the second shell 12 to form a closed cavity, and the first shell 11 is provided with a leading-out hole 13; the battery cell 2 is accommodated in the closed cavity, and a first tab 21 is led out from one end of the battery cell 2; one end of the wire 3 is electrically connected with the first tab 21, and the other end of the wire 3 penetrates through the lead-out hole 13 and is used for being electrically connected with an external circuit; the sealing member 4 is fixed to the housing 1 for sealing the lead-out hole 13.

Compared with the prior art in which the first tab 21 of the battery cell 2 is welded with a pole, the mode of electrically connecting with an external circuit is achieved through the pole. In this embodiment, one end of the wire 3 is electrically connected to the first tab 21 led out from one end of the electric core 2, and the other end of the wire 3 penetrates through the lead-out hole 13 of the housing 1, so that the electric core 2 can be electrically connected to an external circuit through the wire 3. The battery core 2 of the embodiment is electrically connected with an external circuit through the lead 3, so that the welding difficulty is reduced; in the prior art, the battery needs to leave enough space for the housing 1 to mount the pole and accommodate the welding structure of the pole and the pole lug, so that the energy density of the battery is reduced. Whereas the space required for the wires 3 of the present embodiment is smaller. Meanwhile, the wire 3 is good in flexibility, can be bent at various angles well, and cannot be broken in the bending process, so that the wire is better suitable for various use occasions. Compared with the pole needing to be processed, the lead 3 is easy to obtain and low in price. In addition, because the lead 3 is directly led out of the hard shell battery and is used for being welded with an external circuit, the lead 3 can be directly used for being connected with a circuit board during battery Pack, so that a pole is not required to be welded with the lead, the investment of automatic welding equipment is reduced, and the manufacturing period of the battery is shortened.

Specifically, the first housing 11 is a disc-shaped structure, the lead-out hole 13 penetrates through the upper surface and the lower surface of the first housing 11, and the sealing member 4 is bonded to the first housing 11. The second casing 12 includes a bottom wall 121 and a side wall 122, the side wall 122 is disposed at an edge of the bottom wall 121, the first casing 11 covers the second casing 12, and the first casing 11 is welded to the side wall 122 to form a closed cavity for accommodating the battery cell 2. It is understood that the bottom wall 121 and the side wall 122 may be integrally formed to form the second housing 12, or the side wall 122 may be welded to the bottom wall 121 to form the second housing 12.

It should be noted that the material of the first housing 11 and the second housing 12 may be stainless steel, the first housing 11 is a disk-shaped structure obtained by stamping a stainless steel sheet, the second housing 12 is a cup-shaped structure obtained by stamping a stainless steel sheet, the shape area of the first housing 11 is the same as the shape area of the opening of the second housing 12, and the wall thickness of the first housing 11 and the second housing 12 may be adjusted according to the battery design, which is not limited herein. It is understood that the material of the first shell 11 and the second shell 12 may also be aluminum alloy, copper alloy, nickel alloy, magnesium aluminum alloy or molybdenum metal.

Specifically, the battery cell 2 includes a positive plate, a negative plate, and a diaphragm, and the diaphragm is disposed between the positive plate and the negative plate. The positive plate, the negative plate and the diaphragm are wound to form the battery core 2. The positive plate is formed by a positive current collector and a positive active material layer coated on the surface of the positive current collector, and the negative plate is formed by a negative current collector and a negative active material layer coated on the surface of the negative current collector. In order to enable the pole piece to weld the tab, a section of active material-uncoated area is left on the surface of the current collector, and the area is an empty foil area. The positive tab and the negative tab are respectively welded on the empty foil areas of the positive plate and the negative plate in an ultrasonic welding, laser welding or resistance welding mode.

It should be noted that the positive electrode tab is an aluminum tape, and the negative electrode tab is a copper nickel-plating tape, a copper tape or a nickel tape. And respectively welding the aluminum strip and the copper nickel plating strip on the empty foil areas of the positive plate and the negative plate by adopting an ultrasonic welding, laser welding or resistance welding mode. And arranging a diaphragm between the positive plate welded with the tabs and the negative plate to perform winding to obtain the battery cell 2, wherein the positive tab and the negative tab are respectively led out from the same end of the battery cell 2 or from different ends of the battery cell 2.

As an alternative to this embodiment, the positive tab may be the first tab 21, and the negative tab may be the second tab 22; or the positive tab may be the second tab 22 and the negative tab may be the first tab 21. The battery cell 2 is welded with the lead 3 and the housing 1 through the first tab 21 and the second tab 22, and then is conducted with an external circuit. The first tab 21 and the lead 3 may be welded by ultrasonic welding, laser welding or resistance welding, and the second tab 22 and the housing 1 may be welded by ultrasonic welding, laser welding or resistance welding.

When the first tab 21 and the second tab 22 are led out from different ends of the battery cell 2, the second tab 22 is welded to the bottom wall 121 of the second casing 12. When the first tab 21 and the second tab 22 are led out from the same end of the battery cell 2, the second tab 22 is welded to the first casing 11. Since the side walls 122 of the first shell 11 and the second shell 12 are welded by laser, the first shell 11 and the second shell 12 are conducted, and the electrical property of the housing 1 is the same as that of the second tab 22.

As an alternative to this embodiment, one end of the wire 3 is welded to the first tab 21, wherein the welding position and the first tab 21 are covered with a layer of protective glue. The mode of covering the welding position and the first tab 21 with a layer of protective glue comprises thermal compounding PP glue, pasting insulating gummed paper or coating insulating glue, and the mode of covering the welding position and the first tab 21 with a layer of protective glue can avoid the first tab 21 and the welding position from contacting the shell 1 to cause short circuit of the battery.

As an alternative to this embodiment, the lead 3 includes a metal conductor 31 and an insulating sheath 32 covering the metal conductor 31. Since the metal conductor 31 of the lead wire 3 is covered with the insulating coating 32, when the lead wire 3 is used, the insulating coatings 32 at both ends of the lead wire 3 need to be cut off to expose the metal conductor 31, and the exposed metal conductor 31 can be used for welding with the first tab 21 and with an external circuit. The material of the metal conductor 31 may be copper or aluminum. The insulating sheath 32 may be made of one of resin, plastic, silicon rubber, and PVC. The insulating layer 32 forms an insulating layer on the outer surface of the metal conductor 31 to prevent the metal conductor 31 from contacting with the outside to cause accidents such as electric leakage, short circuit, electric shock and the like. Since the metal conductor 31 and the insulating sheath 32 have good flexibility, the lead 3 can be bent many times at any angle without breaking, so that the battery has a wide application range.

As an alternative to this embodiment, the sealing member 4 includes a column portion 41 and a base portion 42 disposed at one end of the column portion 41, the base portion 42 is integrally formed with the column portion 41, the column portion 41 is accommodated in the lead-out hole 13, the diameter of the base portion 42 is larger than that of the lead-out hole 13, the base portion 42 is disposed inside the first housing 11, the base portion 42 and the column portion 41 are both provided with a relief hole 43, and the lead wire 3 passes through the relief hole 43. The sealing element 4 is provided with the base body part 42 and the base body part 42 is fixed on the inner side of the shell 1, so that the connecting area of the sealing element 4 and the shell 1 is increased, the connecting strength of the sealing element 4 and the shell 1 is improved, and the sealing performance of the sealing element 4 is ensured.

The sealing member 4 is prepared by one or more of injection molding, high-frequency heating, hot pressing, reactive curing, high-temperature sintering, riveting and gluing. The sealing element 4 is made of any one of polymer materials such as polypropylene rubber, fluororubber, chloroprene rubber, bromobutyl, polyethylene, polyester compound, anti-electrolyte oxidation glue, ethylene propylene, butyl, curing glue, FPA and the like. Preferably, the base portion 42 and the pillar portion 41 are formed in an injection-molded T-shaped configuration.

As an alternative to this embodiment, the housing 1 is provided with an explosion-proof thread 14. The explosion-proof lines 14 are grooves formed by laser etching or punching the inner surface or the outer surface of the first housing 11 or the second housing 12. The shape of the explosion-proof veins 14 includes, but is not limited to, a C-shape, an S-shape, a V-shape, an X-shape and an O-shape. The depth of the explosion-proof lines 14 may be adjusted according to the capacity of the battery, but is not limited thereto. Because the casing thickness attenuation of explosion-proof line 14 department makes intensity decline, when the battery takes place the thermal runaway, the increase of internal pressure produces a large amount of gas and leads to internal pressure to sharply increase, and explosion-proof line 14 breaks preferentially under the effect of atmospheric pressure, forms the gas escape that the pressure release passageway will be inside, prevents the further thermal runaway of battery, has improved the security of battery.

Example 2

As shown in fig. 7, unlike embodiment 1, the lead-out hole 13 of the present embodiment penetrates the upper surface and the lower surface of the bottom wall 121, the sealing member 4 is adhered to the bottom wall 121, and the second tab 22 is welded to the first case 11.

The rest of the structure is the same as embodiment 1, and is not described again.

Example 3

As shown in fig. 8, unlike embodiment 1, the side wall 122 of the second housing 12 of the present embodiment is provided with a step 123, and the first housing 11 is in clearance or interference fit with the step 123. When the first housing 11 and the second housing 12 are welded, the first housing 11 and the second housing 12 need to be covered on the second housing 12, and since the step 123 is disposed on the side wall 122 of the second housing 12, the step 123 can play a role in positioning the first housing 11, so that the first housing 11 can be accurately covered on the opening of the second housing 12, thereby reducing the difficulty in the welding preparation process and improving the welding yield of the battery.

Optionally, the outer diameter of the first housing 11 is smaller than the inner diameter of the step 123 of the second housing 12, and when the first housing 11 is covered on the second housing 12, a gap exists between the first housing 11 and the step 123, so that the first housing 11 can be more easily inserted into the step 123, and then the step 123 and the first housing 11 are laser welded. Since the first housing 11 and the second housing 12 have a gap through the step 123, the gap can provide a transition space for the laser-melted metal, thereby preventing the melted metal from being splashed. Laser welding can be from the top or side.

Optionally, the outer diameter of the first housing 11 is larger than the inner diameter of the step 123 of the second housing 12, and when the first housing 11 is covered on the second housing 12, since the first housing 11 and the second housing 12 are in interference fit, it is necessary to embed the first housing 11 into the step 123 using pressure, and then laser welding is performed on the step 123 and the first housing 11. Because the first shell 11 and the second shell 12 are in interference fit through the step 123, the connection between the first shell 11 and the second shell 12 is tighter, and the sealing performance of the housing 1 is improved. Laser welding can be from the top or side.

The rest of the structure is the same as that of embodiment 1, and is not described again here.

Example 4

As shown in fig. 9, unlike embodiment 1, the base portion 42 of the present embodiment is provided outside the first housing 11 or the bottom wall 121. When the battery takes place thermal runaway, the temperature of battery can rise, and when the temperature rose to the melting point temperature that is close to sealing member 4, the surface of sealing member 4 can soften, and then reduces sealing member 4 and shell 1's joint strength, and simultaneously under the effect of the inside atmospheric pressure of battery, sealing member 4 can be broken away by gas to the hole 13 forms the pressure release passageway is drawn forth in the messenger, with the inside gas outgoing of battery, guarantees the safety of battery.

The rest of the structure is the same as embodiment 1, and is not described again.

Example 5

As shown in fig. 10 to 11, unlike embodiment 1, the seal 4 of the present embodiment includes a column portion 41 and base portions 42 provided at both ends of the column portion 41, the base portions 42 are provided inside and outside the first housing 11 or the bottom wall 121, the base portions 42 are integrally formed with the column portion 41, and the base portions 42 provided at both ends of the column portion 41 and the column portion 41 form an i-shaped structure. By providing the base portions 42 at both ends of the pillar portion 41, the base portions 42 at both ends can be fixed to the inside and the outside of the housing 1, respectively, so that the connection area between the seal 4 and the housing 1 is increased, and the sealing performance of the seal 4 is improved.

The rest of the structure is the same as embodiment 1, and is not described again.

Example 6

The battery module of the present embodiment includes the hard-shell battery of any one of the above embodiments.

Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (10)

1. A hard-shell battery, comprising:

the shell (1) comprises a first shell (11) and a second shell (12), the first shell (11) is connected to the second shell (12) to form a closed cavity, and a leading-out hole (13) is formed in the first shell (11) or the second shell (12);

the battery cell (2) is accommodated in the closed cavity, and a first tab (21) is led out from one end of the battery cell (2);

one end of the wire (3) is electrically connected with the first tab (21), and the other end of the wire (3) penetrates through the lead-out hole (13) and is electrically connected with an external circuit;

and the sealing element (4) is fixed on the shell (1) and used for sealing the leading-out hole (13).

2. The hard-shell battery according to claim 1, characterized in that a second tab (22) leads from one end of the cell (2), the second tab (22) being electrically connected to the housing (1), the second tab (22) and the first tab (21) leading from the same end of the cell (2), or the second tab (22) and the first tab (21) leading from different ends of the cell (2).

3. A hard-shell battery according to claim 1, wherein one end of said wire (3) is welded to said first tab (21), wherein the welded location and said first tab (21) are covered with a protective gel.

4. A hard-shell battery according to claim 1, characterized in that the lead (3) comprises a metal conductor (31) and an insulating sheath (32) encasing the metal conductor (31).

5. The hard-shell battery according to claim 1, wherein the sealing member (4) comprises a column portion (41) and a base portion (42) provided at least one end of the column portion (41), the base portion (42) is formed integrally with the column portion (41), the column portion (41) is accommodated in the lead-out hole (13), the base portion (42) has a diameter larger than that of the lead-out hole (13), and the base portion (42) is provided on the inner side and/or outer side of the case (1), the base portion (42) and the column portion (41) are each provided with a relief hole (43), and the lead wire (3) passes through the relief hole (43).

6. The hard-shell battery of claim 1, wherein the first housing (11) is disk-shaped, the lead-out holes (13) extend through the upper and lower surfaces of the first housing (11), and the seal (4) is bonded to the first housing (11).

7. The hard-shell battery according to claim 1, wherein the second case (12) comprises a bottom wall (121) and a sidewall (122), the sidewall (122) is disposed at an edge of the bottom wall (121), the first case (11) is covered on the second case (12), the first case (11) and the sidewall (122) are welded, the lead-out hole (13) penetrates through an upper surface and a lower surface of the bottom wall (121), and the sealing member (4) is adhered to the bottom wall (121).

8. A hard-shell battery according to claim 7, characterized in that the side wall (122) of the second housing (12) is provided with a step (123), the first housing (11) being a clearance or interference fit with the step (123).

9. A hard-shell battery according to claim 1, characterized in that the housing (1) is provided with explosion-proof threads (14).

10. A battery module comprising the hard-shell battery according to any one of claims 1 to 9.

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