CN219457812U - Top cap, shell assembly, battery monomer, battery module and consumer - Google Patents

Abstract

The utility model relates to a top cover, a shell assembly, a battery monomer, a battery module and electric equipment, which comprises the following components: a connecting groove is concavely formed on the first side surface of the cover plate in the thickness direction and is used for being nested and spliced with a port of the shell; and the hot-melt connecting medium is filled in the connecting groove and is used for being fixedly connected with the port of the shell in a hot-melt mode under the heating condition. The solid-state hot-melt connecting medium is converted into a molten state under the high-temperature condition of heating, so that the solid-state hot-melt connecting medium can be effectively and fully jointed with the port of the shell and the cover plate, the heating end socket is removed after the solid-state hot-melt connecting medium is heated for a preset time, and the hot-melt connecting medium is cooled and fixed, so that the cover plate and the shell seal are welded. According to the scheme, the purpose of once packaging and connecting the top cover and the shell can be achieved only by heating the hot-melting connecting medium, the processing efficiency is greatly improved, the productivity is improved, the equipment investment cost for heating the sealing head is lower, and the economical efficiency is improved.

Description

Top cap, shell assembly, battery monomer, battery module and consumer

Technical Field

The utility model relates to the technical field of battery processing, in particular to a top cover, a shell assembly, a battery cell, a battery module and electric equipment.

Background

In recent years, the new energy automobile industry rapidly develops, and the lithium ion power battery plays an important role as a power source of the new energy automobile, which is mainly attributed to the advantages of high energy density, high power density, good cycle performance and the like of the lithium ion power battery.

In the battery production and manufacturing process, the welding of the top cover and the shell is a key process in the battery packaging process, and the traditional welding processing mode is to adopt laser to carry out fusion welding on the connecting part of the top cover and the shell, and as the welding seam is generally longer, the welding processing efficiency is lower, the productivity is affected, meanwhile, the reworking quality rate after defects are generated in the welding process is low, the reworking is not facilitated, the input cost of laser welding equipment is high, and the occupied production line investment ratio is large.

Disclosure of Invention

Based on this, it is necessary to provide a top cap, a housing assembly, a battery cell, a battery module and electric equipment, and aims to solve the problems of low processing efficiency and high equipment input cost in the prior art.

In one aspect, the present application provides a top cover comprising:

the first side surface of the cover plate is concavely provided with a connecting groove which is used for being nested and spliced with the port of the shell; and

and the hot-melt connecting medium is filled in the connecting groove and is used for being fixedly connected with the port of the shell in a hot-melt mode under the heating condition.

In battery manufacturing, the top cover of the scheme is used for packaging the shell and the cover plate to form a shell assembly. Specifically, during processing, a connecting groove is processed on a first side surface in the thickness direction of the cover plate, a hot-melt connecting medium is filled in the connecting groove in advance, then the shell is placed above the cover plate, a force towards the cover plate is applied to the shell, for example, a heavy object is placed on the shell (of course, if the weight of the shell is enough, the heavy object can be placed also), so that a port of the shell is aligned and inserted into the connecting groove to be effectively contacted with the hot-melt connecting medium, finally, a heating end socket is close to or contacted with the outer periphery of the cover plate and is heated, the solid hot-melt connecting medium is converted into a molten state under the high-temperature condition of heating to be effectively and fully jointed with the port of the shell and the cover plate, the heating end socket is removed after the preset time is heated, and the hot-melt connecting medium is cooled and fixed, so that the cover plate and the seal of the shell are welded. Compared with the existing laser welding sealing mode, the scheme can achieve the purpose of once packaging and connecting the top cover and the shell only by heating the hot-melt connecting medium, does not need to move the operation of the laser welding head according to the length of the welding line, greatly improves the processing efficiency, is beneficial to improving the productivity, reduces the processing energy consumption, has lower equipment investment cost for heating the sealing head, and improves the economy.

The technical scheme of the application is further described below:

in one embodiment, the hot-melt connection medium is collected at the bottom of the connection groove, so that a containing cavity is formed between the hot-melt connection medium and two opposite groove walls of the connection groove in a surrounding manner, and the containing cavity is used for enabling the port of the shell to extend into contact with the hot-melt connection medium.

In one embodiment, the hot-melt connecting medium is distributed at the bottom of the connecting groove.

In one embodiment, the groove wall of at least one side of the connecting groove is arranged in an outward inclined way in the direction away from the center of the connecting groove, so that a flash accommodating gap can be formed between the groove wall of the connecting groove and the outer side wall of the port of the shell; or alternatively

The outer side wall of the port of the shell is provided with an inclined plane, and the inclined plane can be matched with the groove wall of the connecting groove to form a flash accommodating gap.

In one embodiment, the hot-melt connection medium is provided as a braze welding flux.

In one embodiment, the width of the connecting groove ranges from 0.15mm to 2.5mm;

the depth range of the connecting groove is 0.5-5 mm, and the height range of the hot melt connecting medium in the connecting groove is 0.5-5 mm; wherein the height of the hot melt connecting medium is smaller than the depth of the connecting groove.

In one embodiment, the connecting groove is of an annular structure.

In one embodiment, the second side surface of the cover plate in the thickness direction is provided with a positive electrode post and/or a negative electrode post in a protruding manner, and the positive electrode post and/or the negative electrode post are respectively arranged close to two ends of the cover plate in the length direction.

In another aspect, the present application also provides a housing assembly, comprising:

a housing; and

a cap as described above, the cap encapsulating the port of the housing.

In addition, the application also provides a battery cell, which comprises the shell assembly.

Further, the application also provides a battery module, which comprises the battery cell.

Finally, the application also provides electric equipment, which comprises the battery module.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the structure of the top cover of the present application;

FIG. 2 is a schematic cross-sectional view of the structure at A-A in FIG. 1;

FIG. 3 is a schematic diagram illustrating the assembly of a connecting slot and a port of a housing according to an embodiment;

FIG. 4 is a schematic view of another embodiment of a connection slot and port assembly of a housing;

FIG. 5 is a schematic view of the structure of the case assembly formed by the cap and the case after the cap and the case are encapsulated;

FIG. 6 is a schematic view of a structure in which a heating head is used to heat and weld the top cover and the housing;

fig. 7 is a schematic cross-sectional view of fig. 5 at B-B.

Reference numerals illustrate:

100. a top cover; 110. a cover plate; 120. a positive electrode post; 130. a negative electrode post; 140. a connecting groove; 150. a hot melt connecting medium; 160. the accommodating gap; 200. a housing; 300. heating the end socket; 310. a narrow-edge seal head; 320. a broadside seal head.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

Referring to fig. 1, 2 and 7, a top cover 100 according to an embodiment of the present application is shown, which includes: cover plate 110 and hot melt connection medium 150.

A connecting groove 140 is concavely formed on the first side surface of the cover plate 110 in the thickness direction, and the connecting groove 140 is used for being nested and inserted with a port of the housing 200; the hot-melt connection medium 150 is filled in the connection groove 140, and the hot-melt connection medium 150 can be fixed with the port of the housing 200 in a hot-melt connection under heating.

Wherein, the shape and the size of the cover plate 110 can be flexibly designed according to actual needs. For example, in this embodiment, the cover plate 110 has a rectangular shape, and the connecting slot 140 has a ring-shaped structure. The specific connecting groove 140 is a rectangular groove extending in an annular shape near the peripheral edge of the cover plate 110, so that the shape and the size of the port of the rectangular housing 200 can be matched, and the port of the housing 200 can be ensured to be smoothly inserted into the connecting groove 140.

The first side is a side of the cover plate 110 opposite to the housing 200.

In addition, the second side surface of the cap plate 110 in the thickness direction is provided with a positive electrode post 120 and a negative electrode post 130 in a protruding manner, and the positive electrode post 120 and the negative electrode post 130 are respectively arranged near both ends of the cap plate 110 in the length direction.

The second side is a side of the cover plate 110 opposite to the first side, i.e., a side of the cover plate 110 facing away from the housing 200.

The electrode assembly is also required to be mounted in the case cavity of the case 200 before the top cap 100 is sealed with the case 200, the positive electrode current collecting member of the electrode assembly is welded with the positive electrode tab 120, and the negative electrode current collecting member is welded with the negative electrode tab 130.

The electrode assembly consists of a positive electrode plate, a negative electrode plate and a diaphragm. The battery cell mainly relies on metal ions to move between the positive pole piece and the negative pole piece to work. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the 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, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the positive electrode current collector without the negative electrode active material layer protrudes out of the positive electrode current collector coated with the negative electrode active material layer, and the positive electrode current collector without the negative electrode active material layer is used as a negative electrode lug. 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 separator may be made of PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may be a wound structure or a lamination structure, and the embodiment of the present application is not limited thereto.

In summary, implementing the technical scheme of the embodiment has the following beneficial effects: in battery manufacturing, the top cover 100 of the above-described embodiment is used for packaging the case 200 to constitute a case assembly. Specifically, during processing, the connecting groove 140 is formed on the first side of the cover plate 110 in the thickness direction, the hot-melt connecting medium 150 is pre-filled in the connecting groove 140, then the shell 200 is placed above the cover plate 110, a force towards the cover plate 100 is applied to the shell 200, such as placing a heavy object (of course, the heavy object may not be placed if the weight of the shell 200 is enough), so that the port of the shell 200 is aligned and inserted into the connecting groove 140 to be in effective contact with the hot-melt connecting medium 150, finally the heating end enclosure 300 is close to or in contact with the outer periphery of the cover plate 110 and is heated, the solid hot-melt connecting medium 150 is converted into a molten state under the condition of high temperature of heating to be capable of being in effective and sufficient engagement with the port of the shell 200 and the cover plate 110, the heating end enclosure 300 is evacuated after the preset time, and the hot-melt connecting medium 150 is cooled and fixed to realize the seal welding of the cover plate 110 and the shell 200.

Compared with the existing laser welding sealing mode, the scheme can achieve one-time packaging connection of the top cover 100 and the shell 200 meshes only by heating the hot-melt connecting medium 150, does not need to move the laser welding head according to the length of the welding line, greatly improves the processing efficiency, is beneficial to improving the productivity, and has lower equipment investment cost for heating the sealing head 300 and improves the economy.

It should be noted that, the hot-melt connection medium 150 may be fully distributed at the bottom of the connection groove 140 along the annular extending direction of the connection groove 140, so as to be fully circumferentially sealed and connected with the port of the housing 200, thereby further improving the connection strength and the sealing property.

The heating tip 300 is specifically a heating member capable of generating a high temperature in an energized state. For example, the heating tip 300 is composed of a heating housing and a heating wire installed in the heating housing. The heating wire is electrified to generate high temperature, and heat is transferred to the heating shell, so that when the heating shell approaches or contacts the cover plate 110, the heat can be further transferred to the hot-melt connection medium 150, and hot melting is performed to facilitate connection.

With continued reference to fig. 6, to accommodate the heating requirements of the rectangular cover plate 110, the heating head 300 in this embodiment includes a narrow side head 310 and a wide side head 320. The narrow edge seal 310 corresponds to the short edge of the cover plate 110, and the wide edge seal 320 corresponds to the long edge of the cover plate 110. The heating temperature of the heating head 300 is matched with the hot melting temperature of the hot melting connection medium 150, and the preferable temperature is set to 130-500 ℃.

In some embodiments, the hot-melt connection medium 150 is collected at the bottom of the connection groove 140, so that a receiving cavity is formed between the hot-melt connection medium 150 and two opposite groove walls of the connection groove 140, and the receiving cavity is used for making the port of the housing 200 extend into contact with the hot-melt connection medium 150. The receiving cavity allows the port of the housing 200 to be inserted into the connecting groove 140 to a certain depth, so that the housing 200 and the cover plate 110 form a mounting position, and the connection stability of the housing and the cover plate is ensured. And after the hot-melt connection medium 150 is heated, the hot-melt connection medium 150 in a fluid state is not easily overflowed from the connection groove 140.

With continued reference to fig. 3, in still other embodiments, at least one side of the groove wall of the connecting groove 140 is inclined outwardly away from the center of the connecting groove 140, so that a flash accommodating gap 160 is formed between the groove wall of the connecting groove 140 and the outer side wall of the port of the housing 200. Alternatively, as an alternative to the above embodiment, referring to fig. 4, the outer side wall of the port of the housing 200 is provided with a slope, and the slope can cooperate with the groove wall of the connecting groove 140 to form the flash accommodating gap 160.

That is, it is simply understood that at least one side groove wall of the connection groove 140 or the port outer side wall of the housing 200 is configured to be non-straight, so that when the port of the housing 200 is inserted into the connection groove 140, at least one flash accommodating gap 160 is formed, and when a weight is placed on the housing 200 to generate a pressing force on the hot-melt connection medium 150 in a molten state, it is ensured that most of the hot-melt connection medium 150 is in close contact with the port end surface of the housing 200, and a small part of the hot-melt connection medium 150 can flow into the flash accommodating gap 160 to be simultaneously in contact with the groove wall of the connection groove 140 and the port outer side wall of the housing 200, thereby increasing the connection area and contributing to improving the package connection strength of the cover plate 110 and the housing 200.

It should be noted that the heating time, the weight of the weight, and the time for placing the weight on the housing 200 should be reasonably controlled in order to avoid the overflow of the hot melt connection medium 150 from the burr receiving space 160.

Further, on the basis of any of the above embodiments, the hot-melt connection medium 150 is provided as a brazing filler metal. The brazing solder has good hot-melting connection performance, high solidification connection strength and low use cost. Of course, in other embodiments, the hot-melt connection medium 150 may be other substances that have an equivalent technical effect to the brazing material, and will not be described herein.

As shown in FIG. 2, in some embodiments, the width D of the connecting slot 140 ranges from 0.15mm to 2.5mm; the depth H1 of the connecting groove 140 is in the range of 0.5 mm-5 mm, and the height H2 of the hot melt connecting medium 150 in the connecting groove 140 is in the range of 0.5 mm-5 mm; wherein the height of the hot melt connection medium 150 is smaller than the depth of the connection groove 140. According to different sizes of the cover plate 110 and the shell 200, different packaging requirements are required, at this time, the width of the connecting groove 140, the height for filling the hot-melt connecting medium 150 and the relation between the height of the hot-melt connecting medium 150 and the depth number of the connecting groove 140 are flexibly and reasonably selected, the processing is flexible, and the requirements of packaging and processing of batteries with different specifications are met.

In addition to the above, the present application provides an electric device, which may take various forms, such as a mobile phone, a portable device, a notebook computer, an electric car, a ship, a spacecraft, an electric toy, and an electric tool, for example, a spacecraft including an airplane, a rocket, a space plane, and a spacecraft, and the like, an electric toy including a stationary or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric plane toy, and the like, and an electric tool including a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, and the electric device includes but is not limited to the above products.

The electric equipment comprises a battery module, and the battery module comprises the battery monomer of any embodiment. Generally, the battery module at least includes a bracket and a plurality of battery cells, the plurality of battery cells are installed on the bracket in an array structure, and the plurality of battery cells are connected in series or in parallel.

The battery cell at least includes a case 200, an electrode assembly and a top cap 100, the electrode assembly is mounted in the case 200, the top cap 100 is sealed with a port of the case 200, and the electrode assembly is electrically connected (e.g., welded) with the top cap 100.

The battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiment of the present application. The battery cells may be cylindrical, flat, rectangular, or otherwise shaped, as well as the embodiments herein are not limited in this regard. The battery cells are generally classified into three types according to the manner of packaging: cylindrical batteries, prismatic batteries, and pouch batteries.

The battery module according to the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. The battery module generally includes a case for enclosing one or more battery cells, and the case can prevent liquid or other foreign substances from affecting the charge or discharge of the battery cells.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. 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.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Claims (10)

1. A top cap, comprising:

the first side surface of the cover plate is concavely provided with a connecting groove which is used for being nested and spliced with the port of the shell; and

and the hot-melt connecting medium is filled in the connecting groove and is used for being fixedly connected with the port of the shell in a hot-melt mode under the heating condition.

2. The top cover according to claim 1, wherein the hot-melt connection medium is collected at the bottom of the connection groove, so that a containing cavity is formed between the hot-melt connection medium and two opposite groove walls of the connection groove.

3. The top cover according to claim 1, wherein the hot-melt connection medium is distributed at the bottom of the connection groove.

4. The top cover according to claim 2, wherein at least one side wall of the connecting groove is inclined outwardly away from the center of the connecting groove, so that a burr accommodating gap is formed between the wall of the connecting groove and the port outer side wall of the housing; or alternatively

The outer side wall of the port of the shell is provided with an inclined plane, and the inclined plane can be matched with the groove wall of the connecting groove to form a flash accommodating gap.

5. The header according to claim 1 wherein said hot melt connection medium is provided as a braze.

6. The top cover according to claim 1, wherein the width of the connecting groove ranges from 0.15mm to 2.5mm; and/or

The depth range of the connecting groove is 0.5-5 mm, and the height range of the hot melt connecting medium in the connecting groove is 0.5-5 mm; wherein the height of the hot melt connecting medium is smaller than the depth of the connecting groove; and/or

The connecting groove is of an annular structure; and/or

The second side of the cover plate is provided with positive electrode posts and/or negative electrode posts in a protruding mode, and the positive electrode posts and/or the negative electrode posts are respectively arranged close to two ends of the cover plate in the length direction.

7. A housing assembly, comprising:

a housing; and

the cap of any one of claims 1 to 6, the cap being encapsulated with a port of the housing.

8. A battery cell comprising the housing assembly of claim 7.

9. A battery module comprising the battery cell of claim 8.

10. An electrical device comprising the battery module of claim 9.