Liquid supplementing type cover plate structure and long-circulation battery

Abstract

The utility model relates to a liquid supplementing type cover plate structure and a long-circulation battery. The liquid supplementing type cover plate structure comprises a cover plate body and a liquid storage chamber arranged on the cover plate body, the liquid storage chamber comprises a shell, a liquid injection port and a movable valve; the shell is arranged on the side surface, close to a naked battery cell of the battery, of the cover plate body, and the shell and the cover plate body are enclosed to form an accommodating space for accommodating electrolyte; the liquid injection opening is formed in the cover plate body, and the liquid injection opening is communicated with the accommodating space; a first through hole is formed in the cover plate body, a second through hole is formed in the bottom surface, close to the naked battery cell, of the shell, and the second through hole is opposite to the first through hole; one end of the movable valve is movably connected with the first through hole, and the other end of the movable valve penetrates through the containing space to be movably connected with the second through hole. Through the structure of the application, effective liquid supplementing can be performed on the battery, the cycle performance of the battery is also improved, and the use cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially is related to a liquid supplementing formula cover plate structure and long cycle battery. BACKGROUND

[0002] Electrolyte is a kind of uniform mixture, and various components such as positive electrode, negative electrode, diaphragm and current collector of battery are soaked, and it plays the role of transmission medium for the ion transmission of positive electrode and negative electrode, such as in lithium ion battery, electrolyte plays the role of transmitting lithium ion in addition to the role of bearing various functional additives. In the first charge-discharge process of liquid lithium ion battery, electrolyte reacts on the solid-liquid phase interface with electrode, and forms a passivation layer covering the surface of electrode material, i.e. CEI film on positive electrode or SEI film on negative electrode. However, in the process of battery charge and discharge, the expansion and change of positive and negative electrode volume will make the new electrode surface re-exposed, so that the passivation layer on the surface of electrode material is continuously generated and thickened, resulting in continuous loss of active lithium ion and continuous loss of electrolyte in the battery even dry, battery polarization increases, and eventually battery cycle jumps or even causes safety accidents.

[0003] Patent CN220652305U discloses a liquid injection and liquid supplementing structure for battery, i.e. at least one step is formed on the side away from the inside of battery of liquid injection through hole, and sealing element is placed at the step by welding or other ways;When the battery needs to be supplemented, the sealing element is removed or damaged, and then the liquid supplementing is carried out, and the sealing element is re-set at other steps by welding or other ways. Patent CN218160750U discloses a liquid injection port sealing assembly of lithium battery, which is provided with sealing assembly at the liquid injection port of lithium battery, the sealing assembly comprises plugging member, the plugging member is inserted into the liquid injection port, the top of plugging member is lower than the top of liquid injection port to form sealing space, and sealing glue with hot melt property is arranged in the sealing space;When liquid supplementing is needed, the sealing glue is locally heated and melted at the liquid injection port, and then the plugging member is taken out for liquid supplementing, and after liquid supplementing is completed, it can be sealed according to the foregoing mode. The liquid supplementing structure or assembly disclosed in the above patent needs additional treatment of sealing element before and after liquid supplementing, and the operation is complex;And the lithium battery has strict requirements on liquid injection environment, and high moisture content in air can cause serious damage to lithium battery, so the battery that needs to be supplemented still needs to be processed in factory, which greatly increases the after-sales maintenance cost. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a liquid supplementing formula cover plate structure and long cycle battery, which aims at solving the problems of additional treatment of sealing element before and after liquid supplementing, complex operation, factory processing of battery that needs to be supplemented and high after-sales maintenance cost of prior art liquid supplementing structure.

[0005] To achieve the above object, on one aspect, the utility model discloses the following technical scheme: a kind of liquid supplementing formula cover plate structure, it is applicable to battery, including cover plate body and the liquid storage chamber being set on the cover plate body;The liquid storage chamber includes shell, liquid injection port and movable valve;The shell is set on the side of the cover plate body close to the bare core of the battery, and the shell and the cover plate body are enclosed to form the accommodation space of electrolyte;The liquid injection port is set on the cover plate body, and the liquid injection port is communicated with the accommodation space and is set;The movable valve is movably connected with the first through hole, and the other end passes through the accommodation space and is movably connected with the second through hole.

[0006] The first through hole is formed in the cover plate body, and the second through hole is formed in the bottom surface of the shell close to the bare core, and the second through hole is oppositely arranged with the first through hole;One end of the movable valve is movably connected with the first through hole, and the other end passes through the accommodation space and is movably connected with the second through hole.

[0007] As a preferred embodiment, the movable valve includes an integrally arranged coarse diameter end and a fine diameter end, the coarse diameter end is movably connected with the first through hole, and the fine diameter end is movably connected with the second through hole. As a preferred embodiment, one end of the coarse diameter end close to the cover plate body is arranged as a "T"-shaped end;A first sealing gasket is arranged between the "T"-shaped end and the cover plate body, and the first sealing gasket is circumferentially arranged outside the first through hole.

[0008] As a preferred embodiment, a detachable buckle is arranged between the first sealing gasket and the "T"-shaped end, the buckle is clamped on the coarse diameter end, and the buckle is matched with the coarse diameter end.

[0009] As a preferred embodiment, the coarse diameter end is matched with the first through hole and the first sealing gasket respectively;The hole diameter of the first sealing gasket is equal to the hole diameter of the first through hole.

[0010] As a preferred embodiment, the hole diameter of the first through hole is equal to the hole diameter of the second through hole;The diameter of the fine diameter end is smaller than the hole diameter of the second through hole. As a preferred embodiment, a nut is arranged at one end of the fine diameter end away from the coarse diameter end, and the nut is clamped on the side of the shell away from the accommodation space.

[0011] As a preferred embodiment, the nut is connected with the fine diameter end through threads;The diameter of the nut is larger than the hole diameter of the second through hole;The nut is matched with the fine diameter end.

[0012] As a preferred embodiment, a second sealing gasket is arranged between the nut and the shell, and the second sealing gasket is circumferentially arranged on the side of the second through hole close to the nut;The hole diameter of the second sealing gasket is smaller than the hole diameter of the second through hole, and the second sealing gasket is matched with the fine diameter end.

[0013] As a preferred embodiment, when the buckle is arranged at the thick end, the buckle is in abutment with the thick end and the first gasket respectively, the nut is in abutment with the second gasket, and the accommodating space is a sealed accommodating space.

[0014] As a preferred embodiment, a sealing member is arranged on the liquid injection port.

[0015] In another aspect, the application further provides a long cycle battery comprising the liquid supplementing cover plate structure.

[0016] As a preferred embodiment, the long cycle battery is a square battery, a soft package battery or a cylindrical battery.

[0017] The application has the following beneficial effects: the liquid supplementing cover plate structure can supplement the liquid for the battery at any time and any place, effectively improves the cycle performance of the battery, and reduces the after-sales maintenance cost of the battery product. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description.

[0019] Figure 1 FIG. 1 is a top view of a liquid supplementing cover plate structure according to an embodiment of the application;

[0020] Figure 2 FIG. 2 is a partial cross-sectional view of the liquid supplementing cover plate structure of FIG. 1. Figure 1

[0021] The implementation, functional features and advantages of the application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0022] ​The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0023] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, top, bottom, and the like), the directional indications are only used to explain the relative positional relationship, movement condition and the like between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0024] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there can be a middle element.

[0026] In addition, if the embodiments of the present application involve "first", "second" and the like, the "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0027] Specifically, as Figures 1 to 2As shown, in one aspect, the utility model discloses the following technical scheme: a kind of liquid supplementing formula cover plate structure, it is applicable to battery, including cover plate body 10 and be set on the liquid storage chamber 20 of the cover plate body 10;The liquid storage chamber 20 includes shell 21, liquid injection port 22 and movable valve 23;The shell 21 is set on the side of the cover plate body 10 close to the bare cell of the battery, the shell 21 and the cover plate body 10 are enclosed and form the accommodating space 24 of accommodating electrolyte;The liquid injection port 22 is set on the cover plate body 10, and the liquid injection port 22 is communicated with the accommodating space 24 and is set.

[0028] The first through hole (not marked in the figure) is provided on the cover plate body 10, the second through hole 211 is provided on the bottom surface of the shell 21 close to the bare cell, and the second through hole 211 is oppositely arranged with the first through hole. One end of the movable valve 23 is movably connected with the first through hole, and the other end passes through the accommodating space 24 and is movably connected with the second through hole 211.

[0029] As a preferred embodiment, the movable valve 23 includes an integrally arranged coarse diameter end 231 and a fine diameter end 232, the coarse diameter end 231 is movably connected with the first through hole, and the fine diameter end 232 is movably connected with the second through hole 211.

[0030] As a preferred embodiment, one end of the coarse diameter end 231 close to the cover plate body 10 is arranged as a "T" type end; a first sealing gasket 30 is arranged between the "T" type end and the cover plate body 10, and the first sealing gasket 30 is circumferentially arranged outside the first through hole.

[0031] As a preferred embodiment, a detachable buckle 40 is arranged between the first sealing gasket 30 and the "T" type end, the buckle 40 is clamped on the coarse diameter end 231, and the buckle 40 is matched with the coarse diameter end 231. The diameter of the buckle 40 is greater than the diameter of the coarse diameter end 231, and the diameter of the first sealing gasket 30 is greater than the diameter of the buckle 40. In this way, the tightness of the buckle can be ensured, and the sealing performance of the accommodating space 24 can be ensured.

[0032] As a preferred embodiment, the coarse diameter end 231 is matched with the first through hole and the first sealing gasket 30 respectively; the hole diameter of the first sealing gasket 30 is equal to the hole diameter of the first through hole.

[0033] As a preferred embodiment, the hole diameter of the first through hole is equal to the hole diameter of the second through hole 211; the diameter of the fine diameter end 232 is smaller than the hole diameter of the second through hole 211.

[0034] As a preferred embodiment, the fine diameter end 232 is provided with a screw cap 50 at one end away from the thick diameter end 231, which is clamped on the side of the shell 21 away from the accommodating space 24.

[0035] As a preferred embodiment, the screw cap 50 is connected with the fine diameter end 232 through threads; the diameter of the screw cap 50 is greater than the hole diameter of the second through hole 211; and the screw cap 50 is fitted with the fine diameter end 232.

[0036] As a preferred embodiment, a second sealing gasket 60 is provided between the screw cap 50 and the shell 21, which is circumferentially arranged on the side of the second through hole 211 close to the screw cap 50; the hole diameter of the second sealing gasket 60 is smaller than the hole diameter of the second through hole 211, and the second sealing gasket 60 is fitted with the fine diameter end 232.

[0037] As a preferred embodiment, when the buckle 40 is clamped on the thick diameter end 231, the buckle 40 abuts against the thick diameter end 231, the first sealing gasket 30, the screw cap 50 and the second sealing gasket 60 respectively, and the accommodating space 24 is a sealed accommodating space.

[0038] As a preferred embodiment, a sealing member 70 is arranged on the liquid injection port 22; and the sealing member 70 is fitted with the liquid injection port 22.

[0039] The position of the liquid storage chamber 20 can be set according to actual needs, which can be arranged between the positive pole column 80 and the negative pole column 90, or arranged on one side of the positive pole column 80 or on one side of the negative pole column 90. In this embodiment, the liquid storage chamber 20 is designed between the positive pole column 80 and the negative pole column 90 on the cover plate body 10, the explosion-proof valve 100 is arranged on the side close to the negative pole column 90, the liquid injection hole 110 is arranged on the side close to the positive pole column 80, and the cover plate structure is applied to battery production.

[0040] When the cover plate structure of the application is applied, the electrolyte injection hole 110 of the qualified un-injection battery is sealed temporarily by a hydrogen fluoride acid corrosion resistant adhesive tape or plug (not shown in the figure) after 80-90% of the total mass of the electrolyte is injected into the battery at a dew point environment of-45 DEG C or below, and the remaining 10-20% of the electrolyte is injected into the battery through the electrolyte injection hole 110 after soaking and formation. Then, 10-20% of the total mass of the electrolyte is injected into the liquid storage chamber 20 through the electrolyte injection hole 22, and then the electrolyte injection hole 22 and the electrolyte injection hole 110 are welded and sealed, wherein the sealing member and the cover plate body are made of the same hydrogen fluoride acid corrosion resistant metal material, such as steel or aluminum alloy. After the battery is welded and sealed, it can be assembled into a battery pack after being sorted, aged and matched. The battery product after leaving the factory can be regularly supplemented with electrolyte through the liquid storage chamber 20 designed on the cover plate body 10 during use at the customer end, that is, the buckle 40 is disassembled, the movable valve 23 is pressed downward, the electrolyte in the liquid storage chamber 20 flows into the battery from the second through hole 211 from top to bottom by gravity, and the bare battery core is soaked, and the electrolyte lost due to long-term charging and discharging is supplemented. The movable valve 23 is pulled up and the buckle 40 is reassembled to interrupt the liquid supplementing action of the liquid storage chamber 20.

[0041] In another aspect, the application also provides a long cycle battery, which comprises the liquid supplementing cover plate structure.

[0042] As a preferred embodiment, the long cycle battery is a square battery, a soft package battery or a cylindrical battery.

[0043] The shell 21 and the cover plate body 10 of the structure of the application are welded together, and both can be made of the same hydrogen fluoride acid corrosion resistant metal material, such as steel or aluminum alloy. The movable valve 23, the first sealing gasket 30, the nut 50 and the second sealing gasket 60 are all made of hydrogen fluoride acid corrosion resistant materials (such as metal materials, fluororubber materials or plastic materials, such as polytetrafluoroethylene).

[0044] The liquid supplementing operation of the application is simple, no additional treatment of the sealing member is required, and no special requirements are required for the injection environment. Even in the atmospheric environment, the battery can still be supplemented after leaving the factory and going to the customer end, truly realizing that the battery can be supplemented anytime and anywhere, improving the cycle performance of the battery and reducing the after-sales maintenance cost of the battery product.

[0045] In the description of the present application, the description of the terms "an embodiment", "an example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0046] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

[0047] The above only describes the preferred embodiments of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the utility model specification and the contents of the drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A liquid replenishment cover plate structure, characterized by, The application relates to a battery, which comprises a cover plate body and a liquid storage chamber arranged on the cover plate body; the liquid storage chamber comprises a shell, a liquid injection port and a movable valve; the shell is arranged on the side of the cover plate body close to a bare core of the battery, and the shell and the cover plate body form a storage space for storing electrolyte; the liquid injection port is arranged on the cover plate body and communicates with the storage space. A first through hole is arranged on the cover plate body, a second through hole is arranged on the bottom surface of the shell close to the bare core, and the second through hole is arranged opposite to the first through hole; one end of the movable valve is movably connected with the first through hole, and the other end of the movable valve passes through the storage space and is movably connected with the second through hole.

2. The liquid-supplemented deck structure according to claim 1, characterized by The movable valve comprises an integral coarse-diameter end and a fine-diameter end; the coarse-diameter end is movably connected with the first through hole, and the fine-diameter end is movably connected with the second through hole.

3. The liquid-supplemented deck structure according to claim 2, wherein One end of the coarse-diameter end close to the cover plate body is arranged as a "T"-shaped end; a first sealing gasket is arranged between the "T"-shaped end and the cover plate body, and the first sealing gasket is circumferentially arranged outside the first through hole.

4. The liquid-supplemented deck structure according to claim 3, wherein A detachable buckle is arranged between the first sealing gasket and the "T"-shaped end; the buckle is clamped on the coarse-diameter end, and the buckle is matched with the coarse-diameter end.

5. The liquid-supplemented deck structure according to claim 4, wherein The coarse-diameter end is matched with the first through hole and the first sealing gasket respectively; the hole diameter of the first sealing gasket is equal to the hole diameter of the first through hole. The hole diameter of the first through hole is equal to the hole diameter of the second through hole; the diameter of the fine-diameter end is smaller than the hole diameter of the second through hole.

6. The liquid supplemented cover plate structure according to claim 4, wherein A nut is arranged on one end of the fine-diameter end away from the coarse-diameter end; the nut is clamped on the side of the shell away from the storage space.

7. The liquid supplemented deck structure of claim 6, wherein, The nut is connected with the fine-diameter end through threads; the diameter of the nut is larger than the hole diameter of the second through hole; and the nut is matched with the fine-diameter end.

8. The liquid supplemented cover plate structure according to claim 6, wherein A second sealing gasket is arranged between the nut and the shell; the second sealing gasket is circumferentially arranged on the side of the second through hole close to the nut; the hole diameter of the second sealing gasket is smaller than the hole diameter of the second through hole, and the second sealing gasket is matched with the fine-diameter end.

9. The liquid supplemented cover plate structure according to claim 8, wherein When the buckle is clamped on the coarse-diameter end, the buckle abuts against the coarse-diameter end and the first sealing gasket respectively, the nut abuts against the second sealing gasket, and the storage space is a sealed storage space. A sealing element is arranged on the liquid injection port; the sealing element is matched with the liquid injection port.

10. A long cycle battery, characterized by, The long-cycle battery comprises the liquid supplementing cover plate structure according to any one of claims 1-9. The long-cycle battery is a square battery, a soft package battery or a cylindrical battery.

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