CN109786611B - Battery device and electronic apparatus - Google Patents

Abstract

The invention discloses a battery device and electronic equipment. The battery device includes: a first housing including a first cylindrical side wall and a top cover, and a second housing including a second cylindrical side wall and a bottom cover. At least part of the connection part between the side wall and the bottom cover forms a recessed structure. The first cylindrical side wall is sleeved on the outside of the second cylindrical side wall, between the first cylindrical side wall and the second cylindrical side wall. An insulating seal is provided, and a portion of the first cylindrical side wall close to the open end is partially bent toward the side of the recessed structure along the circumferential direction to form a partial curl, and the local curl is engaged with the recessed structure, inside the battery device When the pressure reaches the set value, the first housing undergoes local deformation, so that the sealing structure between the first housing and the second housing is destroyed, thereby releasing the pressure.

Description

Battery devices and electronic equipment

Technical field

The present invention relates to the technical field of energy storage devices, and more specifically, to a battery device and electronic equipment.

Background technique

Battery power is often required in electronic products. In order to meet the requirements of waterproofing and dustproofing, existing batteries are usually integrally sealed and the structural strength of each part of the casing is similar. However, due to defects in battery design or manufacturing, batteries often catch fire or even explode during abnormal use or overcharging. For the safety of the battery, the shell needs to be able to break the seal when the internal pressure is too high, so that the pressure can be released in time.

Chinese patent application CN103262292A provides a solution. In this solution, the coin cell consists of two half-casings and a seal. The two half-shells are connected to each other by a press fit. The seal is located between the two half-shells. The two half-shells can also be connected to each other in an interlocking manner in the axial direction. The two half-shells have double-walled areas that overlap one another in the axial direction. Under the action of the internal pressure of the shell, the two half-shells move relative to each other in the axial direction, so that the width of the double-walled area is reduced. Holes are provided in the outer half-shell. When the hole is connected to the inner cavity, pressure relief occurs through the hole.

However, the axial distance of button batteries is often fixed when installed, which makes it difficult to move the two half-shells in the axial direction, easily causing pressure relief failure, and the battery requires a large displacement to form protection. Its protection reaction speed is relatively slow and has a large backlog of energy. Therefore, a new technical solution needs to be provided to solve the above technical problems.

Contents of the invention

An object of the present invention is to provide a new technical solution for a battery device.

According to a first aspect of the invention, a battery device is provided. The battery device includes: a first housing including a first cylindrical side wall and a top cover disposed at one end of the first cylindrical side wall; and a second housing, the second The housing includes a second cylindrical side wall and a bottom cover provided at one end of the second cylindrical side wall, and a recessed structure is formed at least partially at a connection between the second cylindrical side wall and the bottom cover, The first housing and the second housing are plugged together with their open ends facing each other, and the first cylindrical side wall is sleeved on the outside of the second cylindrical side wall. An insulating seal is disposed between a cylindrical side wall and the second cylindrical side wall, and a part of the first cylindrical side wall close to the opening end is bent toward the side of the recessed structure along the circumferential direction. A partial curl is formed, and the partial curl forms a snap connection with the recessed structure. When the internal pressure of the battery device reaches a set value, the first shell undergoes partial deformation, so that the first shell The sealing structure between the second housing and the second housing is destroyed, thereby releasing the pressure.

Optionally, an explosion-proof groove is provided on the bottom cover and/or the top cover.

Optionally, a pressure relief hole is provided on the bottom cover and/or the top cover, and a sealing cover is provided on the pressure relief hole. The structural strength of the sealing cover is smaller than that of the top cover or The structural strength of the bottom cover.

Optionally, an explosion-proof groove is provided on the sealing cover.

Optionally, the depth of the explosion-proof groove is 30%-90% of the thickness of the cover.

Optionally, the explosion-proof groove is annular or linear.

Optionally, the explosion-proof groove is in the shape of a positive symbol or a negative symbol.

Optionally, there are one or more partial hems.

Optionally, a plurality of notches are opened in the first cylindrical side wall near the opening end, and tongue-shaped portions are formed between adjacent notches, and the tongue-shaped portions are bent toward the side of the recessed structure, To form partial curling.

According to another embodiment of the present disclosure, an electronic device is provided. The electronic device includes the above-mentioned battery device.

According to one embodiment of the present disclosure, in the battery device, since the partial curl is provided at a portion of the first cylindrical side wall near the opening end along the circumferential direction, compared to the method of forming the curl entirely along the circumferential direction, The structure of this arrangement is relatively unstable. When the internal pressure of the battery device increases to the set value, the squeeze area of the local curling edge will be deformed preferentially, so that the first shell and the second shell can meet the requirements of the battery device. Under the condition of sealing, it can be deformed in time without large axis displacement under small pressure, thereby destroying the sealing structure and releasing the pressure. In this way, the safety performance of the battery is better.

In addition, since the first shell and the second shell are decompressed through the deformation of the first shell, there will be no significant shell separation and less damage to the outside world.

Other features of the invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings.

Description of the drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic structural diagram of a battery device according to an embodiment of the present disclosure.

2 is a cross-sectional view of a battery device according to one embodiment of the present disclosure.

3 is a cross-sectional view of a second battery device according to one embodiment of the present disclosure.

4 is a top view of a second battery device according to one embodiment of the present disclosure.

Figure 5 is a cross-sectional view of a third battery device according to one embodiment of the present disclosure.

Figure 6 is a top view of a third battery device according to one embodiment of the present disclosure.

7-10 are schematic diagrams of battery device pressure relief according to one embodiment of the present disclosure.

Explanation of reference symbols:

11: First cylindrical side wall; 12: Top cover; 13: Bottom cover; 14: Explosion-proof groove; 15: Pressure relief hole; 16: Sealing cover; 17: Insulating ring; 18: Notch; 19: Tongue-shaped portion; 20: Recessed structure; 21: Partial curling; 22: Second cylindrical side wall; 23: Battery core; 24: Sealing structure.

Detailed ways

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values set forth in these examples do not limit the scope of the invention unless otherwise specifically stated.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application or uses.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered a part of the specification.

In all examples shown and discussed herein, any specific values are to be construed as illustrative only and not as limiting. Accordingly, other examples of the exemplary embodiments may have different values.

It should be noted that similar reference numerals and letters refer to similar items in the following figures, so that once an item is defined in one figure, it does not require further discussion in subsequent figures.

According to an embodiment of the present disclosure, a battery device is provided. As shown in Figures 1-2, the battery device is a primary battery or a secondary battery, which includes a first shell and a second shell that are fastened together. Both the first housing and the second housing are made of metal materials, such as aluminum alloy, stainless steel, etc. The first housing and the second housing serve as two electrodes of the battery device respectively.

As shown in FIGS. 1-3 , the first housing includes a first cylindrical side wall 11 and a top cover 12 provided at one end of the first cylindrical side wall 11 . The end of the first cylindrical side wall 11 opposite to the top cover 12 is an open end. The second housing includes a second cylindrical side wall 22 and a bottom cover 13 provided at one end of the second cylindrical side wall 22 . The end of the second cylindrical side wall 22 opposite to the bottom cover 13 is an open end.

As shown in FIGS. 2 , 3 and 5 , a recessed structure 20 is formed at least partially at the connection location between the second cylindrical side wall 22 and the bottom cover 13 . The connection points are located near the corners. Of course, in order to facilitate the installation, the connection part can have a set distance from the corner, or can be formed directly at the corner. The recessed structure 20 is an annular groove or an intermittent groove provided around the bottom cover 13 .

The first housing and the second housing are plugged together with their open ends facing each other. The first cylindrical side wall 11 is sleeved on the outside of the second cylindrical side wall 22 . An insulating seal is provided between the first cylindrical side wall 11 and the second cylindrical side wall 22 . For example, the inner diameter of the first cylindrical side wall 11 is larger than the outer diameter of the second cylindrical side wall 22 . The insulating seal is an insulating ring 17. The material of the insulating ring 17 is plastic or rubber. The above materials can provide good insulation and sealing effects.

For example, as shown in FIG. 7 , the insulating ring 17 forms a U-shaped portion at the position of the sealing structure 24 . The U-shaped portion covers the open end of the second housing. The inner and outer surfaces of the U-shaped portion have larger contact areas with the two shells respectively, which makes the sealing effect of the sealing structure better. The sealing structure 24 refers to the sealing structure formed between the open end of the second housing and the top cover 12 of the first housing.

Before assembly, the battery core 23 is first placed in the second housing, and the insulating ring 17 is placed on the outside of the second cylindrical side wall 22 . The battery cell 23 may be, but is not limited to, a lithium ion battery cell 23, a lithium metal battery cell 23, etc. Then, the open ends of the two housings face each other, and the second cylindrical side wall 22 is inserted into the first cylindrical side wall 11 . A sealed cavity is formed inside the first housing and the second housing. The first cylindrical side wall 11 is pressed toward the second cylindrical side wall 22 for better sealing.

As shown in FIGS. 3 , 4 and 6-10 , the portion of the first cylindrical side wall 11 close to the open end is partially bent toward the side of the recessed structure 20 along the circumferential direction to form a partial curl 21 . The local curling edge 21 forms a snap connection with the recessed structure 20 . The local curling edge is easily deformed when local pressure is applied. When the internal pressure of the battery device reaches the set value, the first shell undergoes local deformation, so that the sealing structure between the first shell and the second shell is destroyed, thereby destroying the sealing structure between the first shell and the second shell. Perform pressure relief.

For example, the first shell undergoes local deformation along the radial direction. The radial direction is shown by the arrow in Figure 10. For example, when the pressure in the cavity reaches 2MPa, the local curling edge 21 moves away from the recessed structure 20 in the radial direction, and finally releases the locking, so that the sealing structure 24 of the first shell and the second shell is destroyed to relieve pressure.

As shown in Figure 9, when the pressure in the cavity reaches 2MPa, the second cylindrical side wall 22 maintains its original shape. Since the partial curl 21 is separated from the recessed structure 20, the first cylindrical side wall 11 is deformed at the open end. The deformation of the open end of the first cylindrical side wall 11 drives the deformation of the portion close to the top cover 12, thereby destroying the sealing structure 24 and forming pores. Internal gases escape from the breach.

For example, as shown in Figures 9-10, the first shell is deformed by internal pressure, and its cross-section changes from a circle to a shape similar to a fusiform, oval, etc. The two local curling edges 21 move away from each other, finally achieving separation from the recessed structure 20 and destruction of the sealing structure at the root of the first housing.

Of course, the number of partial curling edges 21 is not limited to 2 or 3, and those skilled in the art can set it according to actual needs.

In this example, since the partial curl 21 is disposed on a part of the first cylindrical side wall 11 close to the opening end along the circumferential direction, the structure of this arrangement is relatively different from the manner in which all curls are formed along the circumferential direction. Unstable. When the internal pressure of the battery device increases to the set value, it will cause the squeeze area of the local curl to deform preferentially, so that the first and second shells will Under relatively small pressure, the battery can be deformed in time to destroy the sealing structure and release the pressure without generating large axial displacement. In this way, the safety performance of the battery is even better.

In addition, since the battery device releases pressure through the deformation of the first housing, there will be no significant separation of the housing, and it will cause less damage to the outside world.

In addition, since the local curling edge 21 is separated from the recessed structure 20 at least along the radial direction, this separation method can make the pressure relief more rapid, and the energy that can be accumulated inside is less, which is safer.

In one example, as shown in FIGS. 1 , 4 and 6 , there are multiple local curling edges 21 (for example, 3). For example, a plurality of partial curls 21 are distributed relative to the open end of the first housing. In this example, the plurality of partial crimps 21 make the explosion protection level the same at various locations of the first housing and the second housing. The reliability and stability of the battery device are better.

For example, the local crimps 21 are evenly distributed relative to the open end of the first housing, so that the first housing and the second housing are fixed more evenly in the circumferential direction, and the explosion-proof level is higher.

Of course, it is also possible that the plurality of local curling edges 21 are distributed non-uniformly relative to the open end of the first housing.

In other examples, only one partial hem 21 may be provided. This setting method can also achieve good pressure relief and explosion-proof effects. The sealing between the first housing and the second housing is achieved by pressing the first cylindrical side wall 11 , the insulating ring 17 and the second cylindrical side wall 22 against each other.

There are many ways to set the local hemming 21 . In one example, as shown in FIG. 1 , a plurality of notches 18 are opened in a portion of the first cylindrical side wall 11 close to the open end. For example, the notch 18 is formed by laser etching, plasma cutting, stamping, or the like. A tongue-shaped portion 19 is formed between adjacent notches 18 . The left and right sides of the tongue-shaped portion 19 are separated from other parts of the first cylindrical side wall 11 . The tongue-shaped portion 19 is bent toward the side of the recessed structure 20 to form a partial curl 21 . For example, the tongue-shaped portion 19 is pressed toward the recessed structure 20 by punching, so that the tongue-shaped portion 19 is attached to the recessed structure 20 to form a snap connection.

The tongue-shaped portion 19 forms a point contact with the recessed structure 20; or the tongue-shaped portion 19 is an arc and forms an arc surface contact with the recessed structure 20.

In this example, the tongue-shaped portion 19 is more firmly engaged with the recessed structure 20 . The sealing effect between the first housing and the second housing is better.

In addition, the bending of the tongue-shaped portion 19 will not affect other parts of the first cylindrical side wall 11 . Therefore, the overall structure of the battery device does not change.

In other examples, the portion of the first cylindrical side wall 11 close to the open end is bent toward the side of the recessed structure 20 to form a partial curl 21 without providing a notch 18 .

For example, the housing is made of metal. The open end of the first housing is partially punched inward by punching or rolling to form a depression to form a partial curl 21 . Snap connections can also be formed in this way.

In one example, as shown in FIGS. 1-2 , an explosion-proof groove 14 is opened on the bottom cover 13 and/or the top cover 12 . When the pressure inside the battery device reaches the set value, the explosion-proof groove 14 is broken, thereby releasing the pressure. For example, the cross section of the explosion-proof groove 14 is U-shaped, V-shaped, etc. The explosion-proof groove 14 is formed by laser etching or chemical etching. The explosion-proof groove 14 is opened on the inner or outer surface of the top cover 12 and/or the bottom cover 13 . The above shape can form stress concentration at the bottom of the explosion-proof groove 14. The explosion-proof groove 14 is easily broken and has high sensitivity.

For example, the explosion-proof groove 14 is annular or linear. For example, the annular shape includes a rectangular annular shape, a circular annular shape, an elliptical annular shape, etc. The annular explosion-proof groove 14 is easier to be broken through, and a through hole is formed after being broken through. Compared with the formation of gaps, the pressure relief of through holes is faster and the explosion-proof performance is better. Line shapes include straight lines, arc shapes, wavy lines, etc. The above shapes can all play a good role in pressure relief and explosion prevention.

In one example, the explosion-proof groove 14 is in the shape of a positive symbol or a negative symbol. For example, top cap 12 typically serves as the positive terminal of the battery device. The positive current collector of the battery core 23 is electrically connected to the top cover 12 . A “+” shaped explosion-proof groove 14 is opened on the outer surface of the top cover 12 (for example, the middle part of the top cover 12 ). The bottom cover 13 usually serves as the negative terminal of the battery. The negative current collector of the battery core 23 is electrically connected to the bottom cover 13 . A "-" shaped explosion-proof groove 14 is opened on the outer surface of the bottom cover 13 (for example, the middle part of the bottom cover 13). In this example, the explosion-proof groove 14 can not only play the role of pressure relief and explosion-proof, but also can play the role of marking the positive and negative electrodes.

In some battery devices, in order to ensure the structural strength of the battery device, the thickness of the first shell and the second shell is usually relatively large, which makes the first shell and the second shell less likely to deform. The formed explosion-proof groove 14 has low sensitivity and cannot perform pressure relief at a lower pressure (for example, 2 MPa).

In order to solve this technical problem, in one example, as shown in FIGS. 3-6 , a pressure relief hole 15 is opened in the bottom cover 13 and/or the top cover 12 . The pressure relief hole 15 is used for the outflow of gas inside the battery device to relieve pressure. Under normal conditions, the pressure relief hole 15 is sealed. For example, a sealing cover 16 is provided on the pressure relief hole 15 . The structural strength of the sealing cover 16 is smaller than the structural strength of the top cover 12 or the bottom cover 13 where it is located. In this example, due to the lower structural strength of the sealing cover 16, it can rupture under lower pressure to relieve pressure.

Further, as shown in Figures 3 and 5-6, an explosion-proof groove 14 is provided on the sealing cover 16. The shape of the explosion-proof groove 14 is as described above.

In this example, since the structural strength of the sealing cover 16 is smaller than the structural strength of the top cover 12 or the bottom cover 13 , the explosion-proof groove 14 can be broken under a smaller pressure. In this way, the sensitivity of the explosion-proof groove 14 is higher.

For example, the sealing cover 16 is made of metal, such as copper alloy, aluminum alloy, stainless steel, etc. It is arranged on the pressure relief hole 15 by laser welding or resistance welding, and forms a seal.

For example, the sealing cover 16 is made of the same material as the top cover 12 or the bottom cover 13 on which it is located. The thickness of the sealing cover 16 is smaller than the thickness of the top cover 12 or the bottom cover 13 where it is located. Alternatively, the sealing cover 16 may be made of metal with lower structural strength. For example, the top cover 12 or the bottom cover 13 is made of stainless steel, and the sealing cover 16 is made of copper, aluminum, etc.

In one example, the depth of the explosion-proof groove 14 is 30%-90% of the thickness of the cover. The cover body includes a top cover 12, a bottom cover 13 or a sealing cover 16. Within this depth range, the battery device has good sealing performance and safety performance.

In the above embodiment, the snap connection formed by the local curling edge 21 and the recessed structure 20, the sealing cover 16, and the explosion-proof groove 14 form multiple safety measures. In this way, when the pressure within the battery device reaches the set value, at least one safety measure can take effect to relieve the pressure. This arrangement significantly improves the safety performance of the battery device.

According to another embodiment of the present disclosure, an electronic device is provided. The electronic device may be, but is not limited to, a mobile phone, a tablet, a smart watch, a laptop, a game console, a walkie-talkie, a headset, an e-book reader, etc.

The electronic device includes a housing and the battery device described above. A PCB is provided inside the housing. The battery device is arranged in the casing and is electrically connected to the electrical equipment in the electronic equipment through the PCB.

This electronic device has the characteristics of excellent safety performance.

Although some specific embodiments of the invention have been described in detail by way of examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the invention. Those skilled in the art will understand that the above embodiments can be modified without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (10)

1. A battery device, comprising: a first housing including a first cylindrical side wall and a top cover disposed at one end of the first cylindrical side wall, and The second housing includes a second cylindrical side wall and a bottom cover provided at one end of the second cylindrical side wall, between the second cylindrical side wall and the bottom cover. At least part of the connection part forms a recessed structure, the first housing and the second housing are plugged together with their open ends facing each other, and the first cylindrical side wall is sleeved on the second cylindrical side wall. On the outside of the side wall, an insulating sealing member is provided between the first cylindrical side wall and the second cylindrical side wall. The portion of the first cylindrical side wall close to the open end extends along the local direction of the circumferential direction. One side of the recessed structure is bent to form a partial curl, and the partial curl forms a snap connection with the recessed structure. When the internal pressure of the battery device reaches a set value, the first housing partially Deformation causes the sealing structure between the first housing and the second housing to be destroyed, thereby releasing the pressure. 2. The battery device according to claim 1, wherein an explosion-proof groove is provided on the bottom cover and/or the top cover. 3. The battery device according to claim 1, wherein a pressure relief hole is provided on the bottom cover and/or the top cover, and a sealing cover is provided on the pressure relief hole. The structural strength is less than the structural strength of the top cover or the bottom cover. 4. The battery device according to claim 3, wherein the sealing cover is provided with an explosion-proof groove. 5. The battery device according to claim 2 or 4, wherein the depth of the explosion-proof groove is 30%-90% of the thickness of the cover. 6. The battery device according to claim 2 or 4, wherein the explosion-proof groove is annular or linear. 7. The battery device according to claim 1, wherein a portion of the first cylindrical side wall close to the opening end is bent toward the side of the recessed structure to form the partial curl. 8. The battery device according to claim 1, wherein the number of partial curls is one or more. 9. The battery device according to any one of claims 1-4 and 8, wherein a plurality of notches are provided in a portion of the first cylindrical side wall close to the opening end, and between adjacent notches A tongue-shaped portion is formed, and the tongue-shaped portion is bent toward the side of the recessed structure to form a partial curl. 10. An electronic device, comprising the battery device according to any one of claims 1-9.