CN220652305U - Liquid injection and supplementing structure for battery and battery - Google Patents

Abstract

The utility model discloses a liquid injection and liquid supplementing structure for a battery and the battery, wherein the liquid injection and liquid supplementing structure comprises the following components: the battery comprises a body, wherein a liquid injection through hole is formed in the body, and at least one step is formed in one side, far away from the inside of the battery, of the liquid injection through hole; and a plurality of seals, one of which is provided at an end of the side of the liquid injection through hole, and the other of which is provided at each of the steps, respectively. According to the technical scheme, the electrolyte can be supplemented to the power lithium ion battery during the use period, so that the performance of the battery is recovered, the service life of the battery is prolonged, the use cost is reduced, and the user experience is improved.

Description

Liquid injection and supplementing structure for battery and battery

Technical Field

The utility model relates to the technical field of battery manufacturing, in particular to a liquid injection and supplement structure for a battery and the battery.

Background

In the existing lithium ion battery, a graphite negative electrode, a high-voltage positive electrode and liquid organic electrolyte are generally adopted, in the process of forming the battery, part of the electrolyte is reduced on the surface of the negative electrode to form a solid electrolyte interface film SEI, and part of the electrolyte is oxidized on the surface of the positive electrode to form an electrolyte interface film CEI. In the use process of the battery, the electrolyte continuously reacts with the anode and the cathode of the battery to cause the electrolyte to be consumed, so that in many cases, the service life of the battery is finished due to insufficient electrolyte remained in the battery.

With more and more new energy automobiles adopting lithium ion batteries as power sources, however, at the end of the service life of the power batteries, the service life of the power batteries is shorter, the use cost is higher, and the sustainable development is not facilitated because the performance of the lithium ion batteries cannot be repaired.

In addition, due to the limitation of the existing power battery technology, the driving range of the new energy automobile still does not meet the use requirements of most users, particularly, when the power battery is used, the driving range is continuously shortened due to continuous attenuation of the battery capacity along with the extension of the use time, the user experience is greatly influenced, and the novel energy automobile power battery is also a problem to be solved urgently.

Disclosure of Invention

The embodiment of the application provides a annotate liquid and fluid infusion structure and battery for battery to solve current battery and because can not the short service life, with high costs and user experience subalternation problem that the fluid infusion brought.

In one aspect, an embodiment of the present application provides a liquid injection and liquid replenishment structure for a battery, including:

the battery comprises a body, wherein a liquid injection through hole is formed in the body, and at least one step is formed in one side, far away from the inside of the battery, of the liquid injection through hole;

and a plurality of seals, one of which is provided at an end of the side of the liquid injection through hole, and the other of which is provided at each of the steps, respectively.

In some embodiments, the seal is configured to: when the battery requires replenishment, the seal is removed or broken for passage of the priming device.

In some embodiments, the manner in which the seal is disposed at each of the steps or the ends includes: welding, bonding, crimping or integrally forming.

In some embodiments, the shape of the seal comprises: sheet, film, column or cap.

In some embodiments, the seal is provided with a frangible region.

In some embodiments, the seal has a thickness of 0.01 to 5mm.

In some embodiments, the liquid filling through hole is arranged between the battery explosion-proof valve and the battery pole, and the compressive strength of the sealing piece after sealing is larger than the valve opening strength of the battery explosion-proof valve.

In some embodiments, the liquid injection and replenishment structure includes a sealing plug for sealing off the liquid injection through hole.

In some embodiments, the liquid injection and liquid supplementing structure comprises a first step arranged on the liquid injection through hole and a notch sealing piece matched with the first step, and the sealing piece arranged at the end part of the side is a sealing film.

Another aspect of the embodiments of the present application provides a battery comprising an end portion on which the liquid injection and replenishment structure according to any one of the above embodiments is provided.

Compared with the prior art, the utility model has the following advantages:

the liquid injection and liquid supplementing structure is not only suitable for closed formation of the battery, but also suitable for open formation of the battery, and when the liquid supplementing is needed in the later use period of the battery, a liquid injection port is not needed to be additionally arranged, so that the liquid supplementing of the battery is simple and feasible, the service life of the battery is prolonged, and the use cost is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a liquid injection and liquid replenishment structure for a battery according to an embodiment of the present disclosure;

fig. 2 is a schematic top view of a liquid filling and replenishing structure for a battery according to another embodiment;

fig. 3 is a schematic structural diagram of a position where a liquid injection through hole is provided in a square battery according to an embodiment;

fig. 4 is a schematic structural diagram of a liquid injection and replenishing structure for a battery according to still another embodiment of the present disclosure.

Detailed Description

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 those herein described, and those skilled in the art will readily appreciate that the present utility model may be similarly embodied without departing from the spirit or essential characteristics thereof, and therefore the present utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present utility model.

In the description of the present utility model, a plurality includes two and more.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

In the description of the present utility model, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some implementations," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model.

Referring to fig. 1-4, an embodiment of the present utility model shows a liquid injection and replenishment structure for a battery, including: a body (101, 201, 301, 401) comprising an end cap or a housing at one end of the battery, the end cap being a cover part of the battery split structure, the housing being in an end form when the battery is integrally formed. The body is provided with a liquid injection through hole (102, 203, 305, 402), and the liquid injection through hole is provided with at least one step (103-105, 204-206, 403) at one side far away from the inside of the battery.

A plurality of seals (106-109, 405, 407), wherein one seal (109, 407) is disposed on an outer end of the side of the liquid injection through hole, and the remaining at least one seal is disposed on at least one of the steps, respectively.

In this embodiment, in the use state of the liquid filling and supplementing structure, only one step or the end of the side is provided with a sealing element, and the sealing elements can comprise a plurality of sealing elements. When the liquid is needed to be replenished, the sealing element is damaged and then is inserted into the liquid injection device, and the sealing elements are sequentially arranged at other steps after the liquid injection is completed, so that the service life of the battery is prolonged.

In other alternative embodiments, it is also possible to provide the sealing member on more than two steps (less than the total number of steps), which are simultaneously active, thereby securing the sealing effect, without being particularly limited herein.

Through the arrangement, the repeated liquid supplementing of the battery can be realized to prolong the service life of the battery, the performance of the battery is ensured, the cost is reduced, and the user experience is improved.

In some specific embodiments, the seal (106-108, 405) is configured to: when the battery requires fluid replacement, the seal in use is removed or broken for the priming device to pass through, and then the seal is repositioned at the other steps or ends after fluid replacement. Wherein the damage includes puncturing or tearing.

In some embodiments, the manner in which the seal is disposed at each of the steps or the ends includes: welding, bonding, crimping or integrally forming. The preferred connection means is welding, including laser welding, ultrasonic welding, torque welding, although other means such as adhesive bonding followed by sealing may be used.

In some embodiments, the shape of the seal comprises: the sheet, film, column or cap shape is preferably a sheet or film shape.

When a cap seal 106 is employed, as shown in connection with fig. 1, wherein the cap post is used to block the liquid injection through hole, the cap top is used to cooperate with the first step to effect a seal.

In some embodiments, the cross-sections of the filling through-hole (102, 203, 305, 402) and the seal in the horizontal direction are: as shown in fig. 1 and 2, the polygon may be rectangular or rectangular-like, or may be elliptical or other shapes as shown in fig. 3.

In some embodiments, the seal is made of: metal, plastic or rubber. For example, the sealing element can be made of the same material as the end cover, and can also be made of different metal or alloy materials; in order to facilitate the destruction of the liquid before the liquid is replenished, aluminum alloy is preferably adopted; when the seal includes more than two portions, the portions may be of the same or different materials.

Taking the cap-shaped sealing member 106 in fig. 1 as an example, the cap column at the bottom of the cap-shaped sealing member can be made of plastic or rubber, and the cap top is made of metal or alloy material.

In some embodiments, the seal is provided with frangible regions such as thinned regions, weakened regions, or scored regions, where the weakened regions may be formed from materials of different strength, and the scored lines may be straight lines, cross lines, arcs, or any other shape, in combination with the scored seal 405 of fig. 4.

Alternatively, in one embodiment, the seal may have a thickness of 0.01-5mm, preferably 0.02-2mm. This is because if the seal is too thick, it is not easily broken before the fluid is supplied, and if it is too thin, the reliability of the battery is lowered.

In some embodiments, as shown in connection with fig. 3, when the battery is a prismatic battery, the liquid injection through hole 305 is disposed between the battery explosion-proof valve 304 and the battery post 303. In order to ensure the reliability of the battery, the compressive strength of the sealing element after sealing is required to be larger than the valve opening pressure of the explosion-proof valve of the battery, and meanwhile, the sealing element cannot be too large, so that the sealing element is convenient to damage during fluid infusion; optionally, the compressive strength of the sealing member is 2-20Mpa, preferably 5-15Mpa, and the above range includes the number.

In some embodiments, as shown in connection with fig. 4, the liquid filling and fluid replacement structure includes a sealing plug, preferably a rubber sealing plug 404, for sealing off the liquid filling through hole.

Continuing to combine fig. 4, the liquid injection and liquid supplementing structure further comprises a first step 403 arranged on the liquid injection through hole, a grooving sealing member 405 can be matched with the first step, a sealing film 407 is also arranged to be matched with the end portion of the side to serve as a sealing member, specifically, the sealing film is formed by a metal foil with a bonding layer, the material of the metal foil can be metals such as aluminum, copper, stainless steel, zinc, tin and the like, and the bonding layer is not particularly limited.

In combination with this embodiment, in the battery manufacturing process, electrolyte is injected into the battery through the liquid injection through hole 402, then the rubber sealing plug 404 is put into the liquid injection through hole to realize temporary sealing, after the battery is charged, the rubber sealing plug 404 is removed to realize the discharge of the gas in the battery, then the grooving sealing piece 405 is put into the liquid injection through hole, and the grooving sealing piece and the end cover are integrated in a laser welding manner to realize sealing.

During the use of the battery, when the capacity of the battery is attenuated to a certain level, the notch sealing member 405 is punctured by the fluid supplementing needle cylinder, and the electrolyte supplementing fluid is injected into the battery, and then the fluid injecting through hole is sealed by the sealing film 407 to realize sealing.

Another aspect of embodiments of the present application provides a battery comprising an end portion on which the liquid injection and replenishment structure according to any one of the above embodiments is disposed.

The utility model is further illustrated below with reference to specific examples.

Example 1

As shown in fig. 1, a liquid injection and replenishing structure of a lithium ion battery includes: the end cap 101, the liquid injection through hole 102, the first step 103, the second step 104, the third step 105, the first seal 106, the second seal 107, the third seal 108, and the fourth seal 109.

The end cover 101 and the liquid injection through hole 102 arranged on the end cover are respectively provided with a first step 103, a second step 104 and a third step 105 at the outer side of the liquid injection through hole.

In the battery manufacturing process, electrolyte is injected from the liquid injection through hole through the liquid injection device, then the first sealing piece 106 is put into the first step 103, and sealing is achieved after the first sealing piece and the end cover are welded.

In the use process of the battery, when the capacity of the battery is reduced and liquid supplementing is needed, the first sealing piece is damaged to supplement liquid, the second sealing piece 107 is placed to a second step after liquid supplementing is completed, and sealing is achieved after the second sealing piece is welded with the end cover.

When the battery is used again and the capacity fading needs to be filled with liquid, the second sealing piece is destroyed to fill liquid, the third sealing piece 108 is put into the third step after the liquid filling is completed, and the sealing is realized after the third sealing piece and the end cover are welded.

When the battery is used continuously and the capacity fading needs to be filled with liquid, the third sealing piece is destroyed to be filled with liquid, the fourth sealing piece 109 is placed on the surface of the end cover after the liquid filling is finished, and the sealing is realized after the fourth sealing piece and the end cover are welded.

In this embodiment, the end cap is a metal or alloy material, including but not limited to stainless steel or aluminum alloy material.

The liquid injection through holes can be round, rectangular, elliptic or any shape.

Example 2

The liquid injection and supplementing structure shown in fig. 2 comprises: end cap 201, liquid filling through hole 203, first step 204, second step 205, third step 206.

The end cover is circular, the pole 202 is arranged at the center of the end cover, and the liquid injection through hole 203 is arranged between the edge of the end cover and the pole. Of course, the liquid injection through hole can be arranged at any available position on the end cover.

The first seal provided on the end may be in the form of a sheet, a film or a cap. In order to facilitate the destruction of the first seal prior to fluid replacement, a membrane is preferably used. When a cap shape is adopted, the cap column is used for blocking the liquid injection through hole, and the cap top is used for being matched with the first step to realize sealing.

The first sealing element can be made of the same material as the end cover, or can be made of a material which does not use metal or alloy. To facilitate destruction of the fluid prior to its replacement, aluminum alloys are preferred. When the first sealing element is in a cap-shaped design, the cap column can be made of plastic or rubber, and the cap top is made of metal or alloy materials.

The sealing mode between the first sealing piece and the end cover can adopt the modes of laser welding, ultrasonic welding, torque welding and the like, and can also adopt the mode of sealing after the bonding of an adhesive.

When the first sealing member is too thick, the first sealing member is not easy to damage before fluid infusion, and when the first sealing member is too thin, the reliability of the battery is reduced. In this embodiment, the thickness of the first seal is 0.01-5mm, preferably 0.02-2mm.

The second, third and fourth seals corresponding to the first, second and third steps 204, 205, 206 have a material, shape, thickness and manner of sealing similar or identical to the first seal.

The number of steps in this embodiment may be adjusted as required, for example, when only the first step is provided, the first liquid replenishing may be implemented. Number of fluid infusion that can be achieved = number of steps set.

In this embodiment, the sealing members may be sequentially disposed according to the 1 st to nth sealing members, for example, when the battery leaves the factory, the battery is sealed by the first sealing member, and when the fluid is required to be replenished, the first sealing member is destroyed, and after the fluid is replenished, the battery is sealed by the second sealing member, and then sequentially performed. The sealing may be performed in the order of the nth sealing member to the first sealing member, for example, when shipping, the fourth sealing member is used for sealing, when fluid replacement is required, the fourth sealing member is destroyed and removed, and after fluid replacement, the third sealing member is used for sealing, and then the steps are performed similarly. The difference is that in the former case, the previously broken seal member is not removed and can remain on the end cap, thus making the fluid-filling and sealing operations easier.

Meanwhile, in order to facilitate the destruction of the sealing element during fluid infusion, the sealing element can be provided with a device which is easy to destroy, including but not limited to a thinning area, a weakening area, a groove line and the like. The score line may be any shape such as straight line, cross line, arc line, etc.

After the sealing, the 1 st to the N sealing parts are used for guaranteeing the reliability of the battery and simultaneously damaging the battery when the liquid is conveniently replenished, and the compressive strength of the sealing parts after sealing is required to be larger than the valve opening pressure of the explosion-proof valve of the battery and cannot be too large. In this embodiment, the compressive strength of the seal is in the range of 2-20MPa, preferably 5-15MPa.

Example 3

Referring to fig. 3, this embodiment shows a liquid injection and liquid replenishment structure for a square battery, including: the end cap 301, the explosion-proof valve 304, and the liquid injection through hole 305 may be provided between the negative electrode post 303 of the prismatic battery and the explosion-proof valve. The end cover of the square battery is provided with a positive pole 302 at the end opposite to the end where the negative pole 303 is located.

Through the arrangement, the lithium ion battery can be subjected to repeated liquid supplementing so as to fully prolong the service life of the lithium ion battery, and meanwhile, when the liquid supplementing operation is carried out, the difficulty of process operation is simplified to the greatest extent while the quality of the battery is ensured.

Example 4

As shown in fig. 4, this embodiment discloses an integrated liquid injection and liquid supplementing structure, which comprises an end cover 401, a liquid injection through hole 402, a first step 403, a plastic sealing plug 404, a notch 406, a notch sealing member 405 with a notch, a sealing film 407, a metal layer 408 and an adhesive layer 409.

Wherein the liquid filling through hole 402 is provided toward the first step 403 of the battery outside direction. In the manufacturing process of the battery, electrolyte is injected into the battery through the liquid injection through hole 402, then the rubber sealing plug 404 is placed into the liquid injection through hole to realize temporary sealing, after the battery is charged, the rubber sealing plug 404 is removed to realize the discharge of gas in the battery, then the grooving sealing piece 405 is placed into the liquid injection through hole, and the grooving sealing piece and the end cover are integrated in a laser welding mode to realize sealing. The seal has a score 406 therein as shown in fig. 4.

When the battery capacity is attenuated to a certain level, such as 85% of the initial capacity, the notch sealing member is pierced by the fluid infusion needle cylinder and the electrolyte is infused into the battery, and then the fluid infusion through hole is sealed by the sealing film 407 composed of the adhesive layer 409 and the metal layer 408 to realize sealing.

Specifically, in this embodiment, the rubber sealing plug may remain in the liquid injection through hole or may be removed before formation and exhaustion.

The end cover can be made of stainless steel materials or aluminum alloy materials; may be circular or square.

The liquid injection through holes are formed in any available positions on the end cover; the liquid injection through hole can be round, square, elliptic or any other shape, and is preferably round.

The plastic sealing plug is used for temporary sealing of the lithium ion battery and can also be made of any elastic polymer resistant to electrolyte of the lithium ion battery.

The scored sealing element cooperates with the first step and may be made of the same or different material, preferably the same material, as the end cap. The notch seal is provided with notches to facilitate breaking the seal when the battery requires fluid replacement. The notch can be any shape such as straight line, arc, cross, round and the like. The grooves may be formed in the surface of the sealing member facing the inside of the battery, or may be formed in the surface of the sealing member facing the outside of the battery, preferably the inner surface. Thus, when fluid is replenished, the sealing element is easily broken when the sealing element is pierced from outside to inside. The seal still needs to ensure a certain compressive strength while not being too high. Alternatively, the scored seal may have a compressive strength of 2-20Mpa, preferably 5-15Mpa.

Specifically, the sealing film is formed by a metal foil with an adhesive layer, the metal foil can be made of aluminum, copper, stainless steel, zinc, tin and other metals, and the adhesive layer can be formed by any adhesive capable of bonding metals.

Optionally, the sealing film has a thickness of 10-100um, preferably 20-80um; alternatively, the sealing film may be welded to the end cap to form a seal after the liquid injection through hole is shielded by the metal foil.

It should be noted that while the above describes exemplifying embodiments of the utility model, there are several different embodiments of the utility model, which are intended to be illustrative, and that the scope of the utility model is defined by the appended claims.

Claims (10)

1. A liquid injection and replenishing structure for a battery, comprising:

the battery comprises a body, wherein a liquid injection through hole is formed in the body, and at least one step is formed in one side, far away from the inside of the battery, of the liquid injection through hole;

and a plurality of seals, one of which is provided at an end of the side of the liquid injection through hole, and the other of which is provided at each of the steps, respectively.

2. The fluid infusion and refill structure of claim 1 wherein the seal is configured to: when the battery requires replenishment, the seal is removed or broken for passage of the priming device.

3. The fluid infusion and refill structure of claim 1 wherein the seal is disposed at each of the steps or the ends in a manner that includes: welding, bonding, crimping or integrally forming.

4. The fluid infusion and refill structure of claim 1 wherein the seal has a shape comprising: sheet, film, column or cap.

5. The fluid infusion and refill structure of claim 1 wherein the seal is provided with frangible regions.

6. The fluid infusion and replacement structure of any one of claims 1-5, wherein the seal has a thickness of 0.01-5mm.

7. The liquid injection and replenishment structure according to any one of claims 1 to 5, wherein the liquid injection through hole is provided between the battery explosion-proof valve and the battery post, and the sealing member is used for sealing to have a compressive strength larger than a valve opening strength of the battery explosion-proof valve.

8. The fluid infusion and fluid replacement structure according to any one of claims 1-5, wherein the fluid infusion and fluid replacement structure comprises a sealing plug for sealing off the fluid infusion through hole.

9. The liquid injection and liquid supplementing structure according to claim 8, wherein the liquid injection and liquid supplementing structure comprises a first step arranged on the liquid injection through hole and a notch sealing piece matched with the first step, and the sealing piece arranged at the end part of the side is a sealing film.

10. A battery comprising an end portion, wherein the end portion is provided with the liquid injection and replenishment structure according to any one of claims 1 to 9.