CN219759754U - Battery shell, battery and electric equipment - Google Patents

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery shell, a battery and electric equipment, wherein the battery shell comprises a shell body and a cover body, the shell body comprises a side wall and a flaring part, and the side wall and the flaring part are arranged in a surrounding manner along the same axis so as to form a cylindrical structure; the cover body is arranged in the flaring portion, and the cover body is in sealing connection with the flaring portion through a sealing ring. The cover body is arranged at the flaring part, and the gap between the cover body and the cover body is sealed through the sealing ring, so that the shell body and the cover body can be combined to form a sealing space for accommodating the electrode assembly, the welding area of the shell body and the cover body is reduced, the welding time is shortened, when the pressure intensity of the inner cavity of the battery is promoted to reach the upper limit value by gas generated in the battery, the sealing ring is extruded to deform and move upwards along the inner wall of the flaring part, the sealing strength of the shell body and the cover body is further reduced, a pressure relief valve is not required to be arranged on the cover body, the production process of the battery is simplified, and the production efficiency is improved.

Description

Battery shell, battery and electric equipment

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a battery shell, a battery and electric equipment.

Background

With the development of modern society, mobile devices such as video cameras, notebook computers, portable DVDs and digital cameras, electric vehicles, etc. are increasingly used. The cylindrical lithium ion battery has the advantages of high energy density, high working voltage, long service life and the like as a green environment-friendly battery, so that the cylindrical lithium ion battery is widely applied to various mobile equipment.

The cylindrical lithium ion battery generally includes a pole piece group having a winding structure, the pole piece group is formed by winding a positive pole piece, a negative pole piece and a separator film spaced between the positive pole piece and the negative pole piece, the pole piece group having the winding structure is put into a battery case and filled with electrolyte, and then sealed by a battery cap.

At present, the common sealing mode of the cylindrical lithium ion battery is as follows: and sealing the cap and the aluminum shell in a laser welding or pier sealing mode.

However, the welding of the cap and the aluminum shell only plays a role in sealing, and the effect is single; in addition, metal foreign matters such as welding slag and the like are easy to generate in the welding process, and in the whole process, the metal foreign matters are easy to fall into the battery core to cause micro short circuit in the battery core, so that the risk of failure in the use process of the battery is increased.

Some consider that safety risks such as thermal runaway easily occur in the use process of the battery, so that a design of an explosion-proof valve is added on a cover cap or a shell of the battery, however, the whole production process is complicated, and the production efficiency is reduced.

Disclosure of Invention

The utility model aims at: aiming at the defects of the prior art, a battery shell is provided to solve the technical problems in the technical background.

In order to achieve the above purpose, the present utility model adopts the following technical scheme: the battery shell comprises a shell body and a cover body, wherein the shell body comprises a side wall and a flaring part connected with the side wall, and the side wall and the flaring part are arranged along the same axis in a surrounding manner so as to form a cylindrical structure; the cover body is arranged in the flaring portion, and the cover body is in sealing connection with the flaring portion through a sealing ring.

Further, the inner diameter of the flaring portion gradually increases along the direction from the junction of the side wall and the flaring portion to the outer end face of the flaring portion.

Further, the outward expansion distance of the flaring part is 0.5 mm-3 mm.

Further, an annular table is formed at the joint of the side wall and the expansion part, and the upper end face of the annular table is in contact with the sealing ring.

Further, the cover body includes a cover body portion and a protrusion formed by the cover body portion protruding outward along the axis, the protrusion having a diameter smaller than a diameter of the cover body portion.

Further, the sealing ring is sleeved on the convex part, and the sealing ring is in interference fit with the convex part.

Further, the compression amount of the sealing ring is 10% -50%.

Further, the shell body and the cover body are fixedly connected in a local welding mode.

The utility model also provides a battery, which comprises the battery shell and an electrode assembly, wherein the electrode assembly is arranged inside the battery shell.

The utility model also provides electric equipment, which comprises the battery.

The utility model has the beneficial effects that: the utility model provides a battery shell, which comprises a shell body and a cover body, wherein the shell body comprises a side wall and a flaring part connected with the side wall, and the side wall and the flaring part are arranged along the same axis in a surrounding way so as to form a cylindrical structure; the cover body is arranged in the flaring portion, and the cover body is in sealing connection with the flaring portion through a sealing ring. According to the battery shell, the expanding part is arranged, the cover body is arranged at the expanding part, the gap between the expanding part and the cover body is sealed through the sealing ring, so that the shell body and the cover body can be combined to form a sealing space for accommodating the electrode assembly, the shell body and the cover body are not required to be connected together in a sealing mode by adopting a welding process, or the connection firmness of the shell body and the cover body can be enhanced by adopting a local welding mode, the welding area of the shell body and the cover body is reduced, the welding time is shortened, the aim of improving the production efficiency of a battery is achieved, the risk that metal scraps generated in the welding process fall into the battery can be reduced, and secondly, by adopting the structural design, when the pressure of the inner cavity of the battery reaches the upper limit value, the sealing ring is extruded to deform and moves upwards along the inner wall of the expanding part, so that the sealing strength of the shell body and the cover body is reduced, and a channel for discharging the gas in the battery is formed between the shell body and the cover body, and thus the pressure relief effect is realized.

Drawings

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

Fig. 1 is a schematic view of a battery case according to an embodiment of the present utility model;

fig. 2 is a schematic view of a battery according to an embodiment of the present utility model;

FIG. 3 is an enlarged schematic view of part A of FIG. 2;

FIG. 4 is a second schematic view of a battery case according to an embodiment of the utility model;

fig. 5 is a second schematic structural view of a battery according to an embodiment of the present utility model.

Wherein reference numerals are as follows:

1. a housing body; 11. a sidewall; 12. a flared portion; 13. an annular table; 1a, axis; 2. a cover body; 21. a cover body; 22. a convex portion; 3. a seal ring; 4. an electrode assembly; w1, the distance that the flaring expands outwardly.

Detailed Description

Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art can solve the technical problem within a certain error range, substantially achieving the technical effect.

In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "horizontal," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; unless specified or indicated otherwise, the terms "coupled," "fixed," and the like are to be construed broadly and are, for example, capable of being coupled either permanently or detachably, or integrally or electrically; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The present utility model will be described in further detail with reference to fig. 1 to 5, but the present utility model is not limited thereto.

The inventors have noted that the sealing means commonly employed by existing cylindrical batteries are: the cap is sealed with the shell by laser welding or pier sealing. The two sealing modes can play a role in sealing, but have a single action effect. If the cap and the shell are in sealing connection in a laser welding mode, metal foreign matters such as welding slag are easy to generate in the welding process, and the metal foreign matters easily fall into the battery cell, so that micro short circuit in the battery cell is caused, and the risk of failure in the use process of the battery is increased.

Secondly, no matter the sealing is carried out by adopting a laser welding mode or a pier sealing process, the safety problems of easy thermal runaway and the like in the use process of the battery are considered, so that the design of an explosion-proof valve is added on a cap or a shell of the battery, the complexity of the battery production and manufacturing process is further increased, and the production efficiency of the battery is reduced.

Based on the above-mentioned considerations, in order to avoid that metal scraps fall into the interior of the battery to cause micro-shorting of the battery core, and in order to reduce the difficulty of the battery production and manufacturing process and improve the production efficiency, the inventor has devised a battery case after intensive research and study, and as shown in fig. 1 to 5, the battery case comprises a case body 1 and a cover body 2, the case body 1 comprises a side wall 11 and a flaring portion 12 connected with the side wall 11, and the side wall 11 and the flaring portion 12 are circumferentially arranged along the same axis 1a to form a cylindrical structure; the cover body 2 is arranged in the flaring portion 12, and the cover body 2 and the flaring portion 12 are in sealing connection through the sealing ring 3. According to the battery shell, the flaring part 12 is arranged, the cover body 2 is arranged at the flaring part 12, the gap between the two parts is sealed through the sealing ring 3, so that the shell body 1 and the cover body 2 can be combined to form a sealing space for accommodating the electrode assembly 4, the shell body 1 and the cover body 2 are not required to be connected together in a sealing way by adopting a welding process, or the connection firmness of the shell body 1 and the cover body 2 can be enhanced by adopting a local welding mode, the welding area of the shell body 1 and the cover body 2 is reduced, the welding time is shortened, the aim of improving the production efficiency of a battery is achieved, the risk that metal chips generated in the welding process fall into the battery can be reduced, and secondly, by adopting the structural design, when the pressure of a battery cavity is promoted to reach an upper limit value by adopting the gas, the sealing ring 3 is extruded to deform and move upwards along the inner wall of the flaring part 12, and then a gas outflow channel in a power supply battery is formed between the shell body 1 and the cover body 2 is not required to realize a pressure release effect.

More specifically, referring to fig. 4 to 5, in the present embodiment, the inner diameter of the flare 12 gradually increases in the direction from the junction of the side wall 11 and the flare 12 to the outer end face of the flare 12. That is, the flared portion 12 is configured in a horn shape, and in order to enhance the connection strength between the flared portion 12 and the lid 2, in this embodiment, the outer side wall 11 of the lid 2 is inclined by an angle equal to the angle value formed between the flared portion 12 and the axis 1 a.

Referring to fig. 1 and 2, in the present embodiment, both upper and lower ends of the case body 1 are provided with flared portions 12, the flared portions 12 and the inside of the case body 1 are hollow to form a receiving chamber for receiving the electrode assembly 4, and correspondingly, in order to seal the open openings at the two flared portions 12, the battery case in the present embodiment further includes two covers 2, which cover the open openings and are hermetically connected with the flared portions 12 through sealing rings 3, respectively. In another embodiment, as shown in fig. 4 to 5, the case body 1 is provided with a flare portion 12 at only one end, the flare portion 12 and the inside of the case body 1 are hollow to form a receiving chamber for receiving the electrode assembly 4, and a cap 2 for use in cooperation with the flare portion 12 is provided, the cap 2 is embedded in the flare portion 12, and a gap between the cap 2 and the flare portion 12 is sealed by a seal ring 3.

In one embodiment, in order to enhance the connection strength between the cover body 2 and the flaring portion 12, the cover body 2 and the flaring portion 12 are connected by local spot welding, the welding spot width is 2 mm-3 mm, the number of welding spots is 3-6, and the distances between the welding spots are equal, wherein the adjacent two welding spots are distributed along the periphery of the cover body 2 at an angular distance ranging from 60 degrees to 120 degrees. When the cover body 2 and the sealing ring 3 are acted by the air pressure in the battery shell, the sealing ring 3 deforms and moves upwards along the inner wall of the flaring portion 12, so that the sealing effect of the cover body 2 and the shell body 1 is reduced, a channel for the internal air to flow out is formed between the cover body 2 and the shell body 1, and then the purposes of reducing the internal air pressure of the battery and avoiding thermal runaway of the battery are achieved. When the battery is disassembled, the disassembling speed of the battery can be accelerated by starting from the part of the cover body 2 and the flaring part 12 which are not subjected to laser welding, and the connecting strength of the cover body 2 and the flaring part 12 can be further improved by adopting a local welding mode, and the risk that metal scraps fall into the battery can be reduced, so that the probability of micro short circuit in the battery can be reduced.

In this embodiment, the distance W1 that the flare expands outwardly is 0.5mm to 3mm. More specifically, the distance W1 by which the flare expands outwardly is preferably 0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm or 3.0mm.

Referring to fig. 3, in an embodiment, in order to prevent the sealing ring 3 from falling into the battery after being deformed, an annular table 13 is formed at the connection between the side wall 11 and the flaring 12, and the upper end surface of the annular table 13 contacts with the sealing ring 3, wherein the width of the annular table 13 is 0.5 mm-3 mm. I.e. the annular table 13 is arranged circumferentially around the axis 1a to form an annular structure.

Referring to fig. 3, in an embodiment, the cover body 2 includes a cover body 21 and a convex portion 22 formed by the cover body 21 partially protruding outward along the axis 1a, the diameter of the convex portion 22 being smaller than the diameter of the cover body 21. Namely, the cover body 2 is of a T-shaped structure or an I-shaped structure, the sealing ring 3 is sleeved on the convex part 22, and the sealing ring 3 and the convex part 22 are in interference fit. In this embodiment, the cover 2 preferably adopts an i-shaped structure, so that the cover 3 is firmly limited on the cover 2 without arranging an annular table 13 for receiving the seal ring 3 inside the housing, and then the seal ring 3 is arranged in a gap between the cover 2 and the housing, and the seal ring 3 is elastically deformed by extrusion due to the fact that the diameter of the cross section of the seal ring 3 is larger than the width of the gap, so that a reaction force is generated, and the effect of the gap between the seal cover 2 and the housing is achieved. In an embodiment, when the cover 2 adopts a T-shaped structure, in order to prevent the sealing ring 3 from falling into the battery when deformed, the annular table 13 is disposed on the inner wall of the housing and is used for receiving the sealing ring 3, wherein the compression of the sealing ring 3 is 10% -50%, and more specifically, the compression of the sealing ring 3 is preferably 30%.

The utility model also provides a battery, which comprises the battery shell and an electrode assembly 4, wherein the electrode assembly 4 is arranged inside the battery shell.

The electrode assembly 4 is composed of a positive electrode plate, a negative electrode plate and a separation film arranged between the positive electrode plate and the negative electrode plate. The battery mainly relies on metal ions to move between the positive and negative electrode sheets.

The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer arranged on at least one surface of the positive electrode current collector, wherein the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector with the coated positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like.

The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer arranged on at least one surface of the negative electrode current collector, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode tab.

The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current is passed without fusing, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together.

The material of the separator may be polypropylene (PP) or Polyethylene (PE).

The utility model also provides electric equipment, which comprises the battery. The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the utility model does not limit the electric equipment in particular.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the embodiments of the disclosure may be suitably combined to form other embodiments as will be understood by those skilled in the art.

Variations and modifications of the above embodiments will occur to those skilled in the art to which the utility model pertains from the foregoing disclosure and teachings. Therefore, the present utility model is not limited to the above-described embodiments, but is intended to be capable of modification, substitution or variation in light thereof, which will be apparent to those skilled in the art in light of the present teachings. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present utility model in any way.

Claims (10)

1. A battery housing, characterized in that: comprising

The shell comprises a shell body (1), wherein the shell body (1) comprises a side wall (11) and a flaring part (12) connected with the side wall (11), and the side wall (11) and the flaring part (12) are arranged in a surrounding manner along the same axis (1 a) so as to form a cylindrical structure;

the cover body (2), the cover body (2) is arranged in the flaring portion (12), and the cover body (2) is in sealing connection with the flaring portion (12) through a sealing ring (3).

2. A battery housing as defined in claim 1, wherein: the inner diameter of the flaring (12) is gradually increased along the direction from the connecting part of the side wall (11) and the flaring (12) to the outer end surface of the flaring (12).

3. A battery housing as defined in claim 1, wherein: the outward expansion distance of the flaring part (12) is 0.5 mm-3 mm.

4. A battery housing as defined in claim 1, wherein: an annular table (13) is formed at the joint of the side wall (11) and the flaring part (12), and the upper end surface of the annular table (13) is contacted with the sealing ring (3).

5. A battery housing as defined in claim 1, wherein: the cover body (2) comprises a cover body (21) and a convex part (22) formed by the outward extension and protrusion of the cover body (21) along the axis (1 a), wherein the diameter of the convex part (22) is smaller than that of the cover body (21).

6. A battery housing as defined in claim 5, wherein: the sealing ring (3) is sleeved on the convex part (22), and the sealing ring (3) and the convex part (22) are in interference fit.

7. A battery housing as defined in claim 6, wherein: the compression amount of the sealing ring (3) is 10% -50%.

8. A battery housing as defined in claim 6, wherein: the shell body (1) is fixedly connected with the cover body (2) in a local welding mode.

9. A battery comprising the battery case according to any one of claims 1 to 8 and an electrode assembly (4), the electrode assembly (4) being disposed inside the battery case.

10. A powered device comprising the battery of claim 9.