Shell assembly and button lithium battery

Abstract

The utility model provides a shell assembly and a button lithium battery. The shell assembly comprises a containing shell, the containing shell comprises a bearing part and a fence part, the bearing part and the fence part jointly define a mounting groove, a communicating hole is formed between the bearing part and the fence part, the communicating hole is formed in the circumferential direction of the fence part in a surrounding mode, and the communicating hole is communicated with the mounting groove. The shell assembly further comprises a liquid storage part, the liquid storage part is located on the outer side of the containing shell and corresponds to the communicating hole, the liquid storage part is connected with the periphery of the bearing part and the periphery of the enclosure part, a liquid storage groove is formed in the liquid storage part and communicates with the communicating hole, and the liquid storage groove and the mounting groove jointly form a containing groove. Therefore, the probability that the electrolyte overflows during welding is reduced, so that the electrolyte retention consistency in the manufacturing process is relatively high, the performance of the button lithium battery is improved, and meanwhile, the welding yield is also improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of button-type lithium batteries, and in particular to a housing component and a button-type lithium battery. Background Art

[0002] Lithium-ion battery is a secondary battery that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. Button lithium battery is a type of lithium battery. Button lithium battery is also called button lithium battery, which refers to a lithium battery with the appearance size of a small button. Generally, button lithium battery includes a bottom shell, a top cover and a winding core. The top cover is connected to the bottom shell, and the top cover and the bottom shell together form a receiving cavity. The winding core is set in the receiving cavity, and the winding core is connected to the top cover and the bottom shell respectively.

[0003] In the related art, the bottom shell is heat-sealed to the top cover through a heat-sealing adhesive layer, so that the bottom shell and the top cover are tightly connected, and at the same time, the bottom shell and the top cover are insulated, that is, the heat-sealing adhesive layer is used to seal the cover, for example, CN112886047A-Button battery and its manufacturing method. However, the bottom shell and the top cover overlap on the outside of the battery, and a heat-sealing adhesive layer is also provided at the connection between the bottom shell and the top cover, resulting in a thicker thickness on the outside of the battery, resulting in a lower energy density of the battery.

[0004] In order to improve the energy density of the battery, in the related art, the periphery of the top cover is welded to the opening of the bottom shell, that is, the cover is sealed by welding, which avoids the overlap of the bottom shell and the top cover on the outside of the battery and also eliminates the heat sealing layer, for example, CN108232051A-button battery.

[0005] However, during the process of closing the lid and sealing after liquid injection, the electrolyte is more likely to overflow due to the high liquid level of the electrolyte, resulting in poor performance of the button lithium battery. At the same time, the overflowing electrolyte will reduce the welding effect, resulting in a low welding yield. Utility Model Content

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a shell assembly and a button-type lithium battery that improve the performance and welding yield of button-type lithium batteries.

[0007] The purpose of this disclosure is achieved through the following technical solutions:

[0008] A housing assembly comprises a housing, wherein the housing comprises a bearing portion and a surrounding portion, wherein the bearing portion and the surrounding portion together form a mounting groove, wherein a connecting hole is formed between the bearing portion and the surrounding portion, wherein the connecting hole is arranged around the circumference of the surrounding portion, and the connecting hole is connected to the mounting groove;

[0009] The shell assembly also includes a liquid storage portion, which is located on the outside of the accommodating shell and is arranged corresponding to the connecting hole. The liquid storage portion is respectively connected to the periphery of the bearing portion and the periphery of the enclosure portion. The liquid storage portion forms a liquid storage tank, which is connected to the connecting hole, and the liquid storage tank and the mounting groove together form a accommodating groove.

[0010] In one embodiment, the cross-section of the liquid storage portion is arc-shaped, a peripheral edge of the liquid storage portion is connected to a peripheral edge of the bearing portion, and another peripheral edge of the liquid storage portion is connected to a peripheral edge of the bearing portion.

[0011] In one embodiment, the R angle of the inner wall of the liquid storage tank is 0.3 mm to 0.8 mm.

[0012] In one embodiment, the R angle of the inner wall of the liquid storage tank is 0.5 mm.

[0013] In one embodiment, the enclosure portion, the liquid storage portion and the bearing portion are an integrally formed structure.

[0014] In one embodiment, the enclosure portion, the liquid storage portion and the bearing portion are stamped structures.

[0015] In one embodiment, the liquid storage portion protrudes from the bearing portion.

[0016] In one embodiment, the liquid storage portion protrudes from the enclosure portion.

[0017] In one embodiment, the communicating hole is in a closed ring shape, the liquid storage portion is in a closed ring shape, and the bearing portion is connected to the enclosure portion through the liquid storage portion.

[0018] A button-type lithium battery comprises the shell assembly described in any of the above embodiments, and the button-type lithium battery also comprises a top cover assembly, and the top cover assembly is welded to the opening of the containing shell.

[0019] Compared with the prior art, the present invention has at least the following advantages:

[0020] 1. Since the liquid storage part protrudes from the outside of the containing shell, the problem of the liquid storage part reducing the containing space of the containing shell is avoided.

[0021] 2. Since the liquid storage part is arranged corresponding to the connecting hole, the liquid storage part is respectively connected to the periphery of the bearing part and the periphery of the enclosure part, so that the liquid storage part is arranged at the bottom corner of the containing shell; since the liquid storage part is arranged at the bottom corner of the containing shell, after the button-type lithium battery with liquid injection is left to stand for a certain period of time, part of the electrolyte penetrates into the liquid storage tank, that is, part of the electrolyte is temporarily stored in the liquid storage tank, which reduces the liquid level of the electrolyte and reduces the probability of electrolyte overflow during welding, so that the consistency of liquid preservation in the process is higher, the performance of the button-type lithium battery is improved, and the welding yield is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic structural diagram of a button-type lithium battery according to an embodiment;

[0024] Figure 2 for Figure 1 A schematic diagram of a partial structure of a button-type lithium battery shown;

[0025] Figure 3 for Figure 1 Another partial structural schematic diagram of a button-type lithium battery is shown.

[0026] Reference numerals: button-type lithium battery 10 ; housing assembly 100 ; receiving groove 101 ; receiving shell 110 ; bearing portion 111 ; enclosure portion 112 ; mounting groove 1101 ; communicating hole 1102 ; liquid storage portion 120 ; top cover assembly 200 ; winding core 300 . DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0031] like Figure 1 As shown, a button-type lithium battery 10 of an embodiment includes a housing component 100, the housing component 100 is formed with a receiving groove 101, and the button-type lithium battery 10 also includes a top cover component 200, the top cover component 200 is welded to the opening of the housing component 100, so that the top cover component 200 and the housing component 100 together form a receiving cavity. The button-type lithium battery 10 also includes a winding core 300, which is disposed in the receiving cavity.

[0032] like Figures 1 to 3 As shown, in one embodiment, the shell assembly 100 includes a containing shell 110, and the containing shell 110 includes a bearing portion 111 and a surrounding portion 112. The bearing portion 111 and the surrounding portion 112 together form an installation groove 1101, and the installation groove 1101 is used to install the winding core 300. A connecting hole 1102 is formed between the bearing portion 111 and the surrounding portion 112. The connecting hole 1102 is arranged around the circumference of the surrounding portion 112, and the connecting hole 1102 is connected to the installation groove 1101, that is, the connecting hole 1102 is formed at the bottom corner of the containing shell 110. The housing assembly 100 further includes a liquid storage portion 120, which is located outside the housing shell 110 and is arranged corresponding to the communication hole 1102. The liquid storage portion 120 is respectively connected to the periphery of the bearing portion 111 and the periphery of the enclosure portion 112, that is, the liquid storage portion 120 is connected to the bottom corner of the housing shell 110, and the liquid storage portion 120 protrudes from the outside of the housing shell 110. The liquid storage portion 120 is formed with a liquid storage tank 121, which is connected to the communication hole 1102, and the liquid storage tank 121 and the mounting groove 1101 together form a housing groove 101, and the housing groove 101 is used to accommodate the electrolyte and the winding core 300.

[0033] like Figure 2 As shown, in this embodiment, after the liquid is injected, it is left to stand for a certain period of time to allow the electrolyte to penetrate into the liquid reservoir 121, so that the liquid level in the receiving tank 101 is low, and then the top cover assembly 200 is welded to the opening of the receiving shell 110. It can be understood that the liquid reservoir 121 plays the role of temporarily storing part of the electrolyte. When the button lithium battery 10 is used, the electrolyte in the liquid reservoir 121 will be supplemented to the winding core 300, so that the electrolyte is fully in contact with the winding core 300.

[0034] In the button-type lithium battery 10 and the housing assembly 100, the liquid storage part 120 protrudes from the outside of the housing shell 110, thereby avoiding the problem that the liquid storage part 120 reduces the accommodation space of the housing shell 110. Since the liquid storage part 120 is arranged corresponding to the connecting hole 1102, the liquid storage part 120 is respectively connected to the periphery of the bearing part 111 and the periphery of the enclosure part 112, so that the liquid storage part 120 is arranged at the bottom corner of the housing shell 110; since the liquid storage part 120 is arranged at the bottom corner of the housing shell 110, after the button-type lithium battery 10 with liquid injection is left to stand for a certain period of time, part of the electrolyte penetrates into the liquid storage tank 121, that is, part of the electrolyte is temporarily stored in the liquid storage tank 121, which reduces the liquid level of the electrolyte and reduces the probability of the electrolyte overflowing during welding, so that the consistency of liquid preservation in the process is higher, the performance of the button-type lithium battery 10 is improved, and the welding yield is also improved.

[0035] like Figure 2 As shown, in one embodiment, the cross section of the liquid storage portion 120 is arc-shaped, one peripheral edge of the liquid storage portion 120 is connected to the peripheral edge of the bearing portion 111, and the other peripheral edge of the liquid storage portion 120 is connected to the peripheral edge of the bearing portion 111. In this embodiment, the cross section of the liquid storage portion 120 is arc-shaped, which reduces the stress concentration of the liquid storage portion 120 and improves the strength of the liquid storage portion 120.

[0036] like Figure 2 As shown, in one embodiment, the R angle of the inner wall of the liquid storage tank 121 is 0.3 mm to 0.8 mm.

[0037] like Figure 2 As shown, in one embodiment, the R angle of the inner wall of the liquid storage tank 121 is 0.5 mm.

[0038] like Figure 2 As shown, in one embodiment, the enclosure portion 112 , the liquid storage portion 120 and the bearing portion 111 are an integrally formed structure, which improves the structural stability and manufacturing efficiency of the housing assembly 100 .

[0039] like Figure 2 As shown, in one embodiment, the enclosure portion 112 , the liquid storage portion 120 and the bearing portion 111 are stamped structures, which improves the manufacturing efficiency of the housing assembly 100 .

[0040] like Figure 2 As shown, in one embodiment, the liquid storage portion 120 protrudes from the carrying portion 111 to prevent the liquid storage portion 120 from occupying the space of the mounting groove 1101 .

[0041] like Figure 2 As shown, in one embodiment, the liquid storage portion 120 protrudes from the surrounding portion 112 to prevent the liquid storage portion 120 from occupying the space of the installation groove 1101 .

[0042] like Figure 2 As shown, in one embodiment, the connecting hole 1102 is in a closed ring shape, the liquid storage portion 120 is in a closed ring shape, and the bearing portion 111 is connected to the enclosure portion 112 through the liquid storage portion 120. In this embodiment, the liquid storage portion 120 is in a closed ring shape, which increases the liquid storage space of the liquid storage portion 120, so that the liquid level of the electrolyte is lower, which is beneficial to improving the performance of the button lithium battery 10 and the welding yield.

[0043] Compared with the prior art, the present invention has at least the following advantages:

[0044] 1. Since the liquid storage portion 120 protrudes from the outside of the accommodating shell 110 , the problem of the liquid storage portion 120 reducing the accommodating space of the accommodating shell 110 is avoided.

[0045] 2. Since the liquid storage part 120 is arranged corresponding to the connecting hole 1102, the liquid storage part 120 is respectively connected to the periphery of the bearing part 111 and the periphery of the enclosure part 112, so that the liquid storage part 120 is arranged at the bottom corner of the containing shell 110; since the liquid storage part 120 is arranged at the bottom corner of the containing shell 110, after the button-type lithium battery 10 with liquid injection is left to stand for a certain period of time, part of the electrolyte penetrates into the liquid storage tank 121, that is, part of the electrolyte is temporarily stored in the liquid storage tank 121, which reduces the liquid level of the electrolyte and reduces the probability of electrolyte overflow during welding, so that the consistency of liquid preservation in the process is higher, the performance of the button-type lithium battery 10 is improved, and the welding yield is also improved.

[0046] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A housing assembly, comprising a housing, wherein the housing comprises a bearing portion and a retaining portion, wherein the bearing portion and the retaining portion together form a mounting groove, wherein: A communication hole is formed between the bearing portion and the enclosure portion, the communication hole is arranged around the circumference of the enclosure portion, and the communication hole is connected to the installation groove; The shell assembly also includes a liquid storage portion, which is located on the outside of the accommodating shell and is arranged corresponding to the connecting hole. The liquid storage portion is respectively connected to the periphery of the bearing portion and the periphery of the enclosure portion. The liquid storage portion forms a liquid storage tank, which is connected to the connecting hole, and the liquid storage tank and the mounting groove together form a accommodating groove.

2. The housing assembly according to claim 1, characterized in that The cross section of the liquid storage part is in an arc shape, one peripheral edge of the liquid storage part is connected to the peripheral edge of the bearing part, and the other peripheral edge of the liquid storage part is connected to the peripheral edge of the bearing part.

3. The housing assembly according to claim 2, characterized in that The R angle of the inner wall of the liquid storage tank is 0.3 mm to 0.8 mm.

4. The housing assembly according to claim 3, characterized in that: The R angle of the inner wall of the liquid storage tank is 0.5 mm.

5. The housing assembly according to claim 1, wherein: The enclosure portion, the liquid storage portion and the bearing portion are an integrally formed structure.

6. The housing assembly according to claim 5, characterized in that The enclosure portion, the liquid storage portion and the bearing portion are stamping structures.

7. The housing assembly according to claim 1, wherein: The liquid storage portion protrudes from the bearing portion.

8. The housing assembly according to claim 1, wherein: The liquid storage portion protrudes from the enclosure portion.

9. The housing assembly according to claim 1, wherein: The communicating hole is in a closed ring shape, the liquid storage portion is in a closed ring shape, and the bearing portion is connected to the enclosure portion through the liquid storage portion.

10. A button lithium battery, characterized in that: The button-type lithium battery comprises the outer shell assembly according to any one of claims 1 to 9, and the button-type lithium battery further comprises a top cover assembly, and the top cover assembly is welded to the opening of the containing shell.

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