Secondary battery and electric device

Abstract

The utility model provides a secondary battery and an electric device, and relates to the technical field of batteries. The secondary battery comprises a shell and a top cover assembly, the shell is integrally formed by adopting a plastic material, and the shell is provided with an accommodating cavity for accommodating an aqueous electrolyte and an opening communicated with the accommodating cavity. The top cover assembly comprises a top cover, the top cover is integrally formed by plastic materials, and the top cover is connected with the side, provided with the opening, of the shell in a hot melting mode so as to seal the opening. According to the secondary battery provided by the invention, the shell and the top cover are integrally formed by adopting the plastic material, so that compared with a metal material, the plastic material has the advantages that the weight of the battery is reduced, and the plastic material has an insulating property, so that the risk of short circuit is reduced, and the safety of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a secondary battery and an electrical device. Background Art

[0002] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present disclosure and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art known to those skilled in the art.

[0003] Aqueous batteries are a type of secondary battery that uses an aqueous electrolyte, including aqueous sodium-ion batteries, aqueous zinc-ion batteries, and proton batteries. These batteries utilize the chemical properties of water to store and release energy through electrochemical reactions. Existing aqueous batteries are made of metals, such as steel and aluminum, for both the top cover and the casing. This not only increases the overall weight of the battery but also increases the risk of short circuits, making them less safe. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a secondary battery and an electrical device, aiming to solve the technical problems in the prior art of increasing the overall weight of the battery and lowering safety.

[0005] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0006] In a first aspect, an embodiment of the present application provides a secondary battery, comprising:

[0007] The housing is made of a plastic material and is integrally formed. The housing has a receiving cavity for receiving the aqueous electrolyte and is provided with an opening communicating with the receiving cavity.

[0008] The top cover assembly comprises a top cover integrally formed from the plastic material, wherein the top cover is connected to a side of the shell where the opening is formed by thermal melting to close the opening.

[0009] In one embodiment of the first aspect, the plastic material is one of polyphenylene sulfide, polypropylene, acrylonitrile-styrene-butadiene copolymer and polyethylene terephthalate.

[0010] In one embodiment of the first aspect, the secondary battery further includes a battery cell located in the accommodating cavity, the top cover assembly further includes a pole and a fastener, the battery cell has a pole ear, a connection hole is provided on the pole ear, the pole is connected to the top cover, one end of the fastener is passed through the connection hole and connected to the pole ear, and the end of the fastener away from the battery cell is connected to the pole to achieve electrical connection between the battery cell and the pole.

[0011] In one embodiment of the first aspect, the fastener is a rivet, and the rivet is riveted to the tab.

[0012] In one embodiment of the first aspect, the connecting hole is a circular hole with a diameter d, satisfying: 2 mm ≤ d ≤ 30 mm.

[0013] In one embodiment of the first aspect, the tab includes a main body, a first connecting part, and a second connecting part, the first connecting part is connected between the main body and the second connecting part, the second connecting part is provided with the connecting hole passing through it, and there is a gap between the second connecting part and the main body.

[0014] In one embodiment of the first aspect, the second connecting portion is in a sheet shape and is disposed on a side of the top cover facing the battery cell.

[0015] In one embodiment of the first aspect, the second connecting portion is connected to the top cover at a side facing away from the main body.

[0016] In one embodiment of the first aspect, the battery core is connected to at least one inner wall of the housing.

[0017] In a second aspect, an embodiment of the present application further provides an electrical device comprising the secondary battery described in any of the above embodiments.

[0018] The beneficial effects of this application are as follows:

[0019] The present application provides a secondary battery, comprising a shell and a top cover assembly, the shell having an opening and a receiving cavity for accommodating an aqueous electrolyte, that is, the secondary battery is an aqueous battery, and the top cover of the top cover assembly is hot-melt-connected to a side of the shell having an opening to close the opening. Since the shell and the top cover are both integrally molded from a plastic material, the use of plastic reduces the weight of the battery compared to metal, and the plastic material has insulating properties, reducing the risk of short circuits, thereby increasing the safety of the battery.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 shows a schematic diagram of the three-dimensional structure of a secondary battery in some embodiments of the present application;

[0023] Figure 2 Shown Figure 1 Schematic diagram of the decomposition structure;

[0024] Figure 3 Shown Figure 1 Schematic diagram of the enlarged structure of area A in the middle;

[0025] Figure 4 A schematic structural diagram of a secondary battery from one perspective in some embodiments of the present application is shown;

[0026] Figure 5 Shown Figure 4 Schematic diagram of the cross-sectional structure at the middle BB;

[0027] Figure 6 Shown Figure 5 Schematic diagram of the enlarged structure of the C area in the middle.

[0028] Description of main component symbols:

[0029] 100-secondary battery; 110-housing; 111-accommodation cavity; 112-opening; 113-reinforcement groove; 120-top cover assembly; 121-top cover; 122-pole; 123-fastener; 130-battery cell; 131-pole ear; 1311-main body; 1312-first connecting part; 1313-second connecting part; 13131-connection hole; 13132-gap. DETAILED DESCRIPTION

[0030] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an ordered ranking of the indicated technical features. Thus, features defined with "first", "second" or "third" can include, explicitly or implicitly, one or more of such features. In the description of the present application, the meaning of "a plurality of" is two or more, unless explicitly specified and limited otherwise.

[0033] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. 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.

[0034] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0035] Aqueous battery is a kind of secondary battery using aqueous electrolyte (electrolyte solution based on water), including aqueous sodium ion battery, aqueous zinc ion battery and proton battery, etc. Such battery uses the chemical properties of water to store and release energy through electrochemical reaction.

[0036] In the existing aqueous battery, the top cover and the shell are made of metal materials such as steel, aluminum, aluminum alloy, etc. Not only the overall weight of the battery is increased, but also the risk of short circuit is increased, and the safety is low.

[0037] In addition, in the existing aqueous battery, the pole post on the top cover needs to be connected with the tab of the battery cell by laser welding, so as to realize the electrical connection between the battery cell and the pole post. However, laser welding is prone to overwelding and false welding, and the reliability is low, thereby affecting the service life of the battery.

[0038] In order to solve the above technical problems, in a first aspect, the embodiments of the present application provide a secondary battery, which relates to the technical field of battery and is mainly applied to power storage devices, new energy vehicles, spacecraft, ships and other power consumption devices.

[0039] like Figure 1 and Figure 2 As shown, the secondary battery 100 provided in this embodiment includes a housing 110 and a top cover assembly 120 .

[0040] The housing 110 is integrally molded from a plastic material and has a chamber 111 for containing an aqueous electrolyte and an opening 112 communicating with the chamber 111. The top cover assembly 120 includes a top cover 121 integrally molded from a plastic material. The top cover 121 is heat-fused (a method of connecting non-metallic materials by heating to a melting point) to the side of the housing 110 where the opening 112 is located to seal the opening 112.

[0041] For example, the plastic material is one of polyphenylene sulfide (PPS), polypropylene (PP), acrylonitrile butadiene styrene (ABS) and polyethylene terephthalate (PET). No specific limitation is imposed on the plastic material.

[0042] It should be noted that the top cover 121 and the shell 110 can be made of the same plastic material or different plastic materials. For example, the top cover 121 and the shell 110 can both be made of polyethylene terephthalate, or the top cover 121 can be made of polyethylene terephthalate and the shell 110 can be made of polypropylene. No specific restrictions are made here.

[0043] It can be understood that the secondary battery 100 provided in this embodiment is an aqueous battery. Since the shell 110 and the top cover 121 are both made of plastic material in one piece, the use of plastic material reduces the weight of the battery compared to metal material, and the plastic material has insulating properties, which reduces the risk of short circuit, thereby increasing the safety of the battery.

[0044] In addition, since the secondary battery 100 is an aqueous battery and uses an aqueous electrolyte, the aqueous electrolyte will not corrode the top cover 121 and the housing 110 made of plastic material.

[0045] like Figure 2 、 Figure 4 and Figure 5As shown, in one embodiment, the secondary battery 100 further comprises a battery cell 130, the battery cell 130 is located in the accommodating cavity 111, the top cover assembly 120 further comprises a pole 122 and a fastener 123, the battery cell 130 has a tab 131, a connecting hole 13131 is formed on the tab 131, the pole 122 is connected to the top cover 121, one end of the fastener 123 is inserted into the connecting hole 13131 and connected with the tab 131, and the end of the fastener 123 away from the battery cell 130 is connected with the pole 122, so as to realize the electrical connection between the battery cell 130 and the pole 122.

[0046] Exemplarily, the pole 122 can be a positive pole or a negative pole, and the tab 131 can be a positive tab or a negative tab, and the type of the pole 122 and the tab 131 is not specifically limited herein. In addition, the battery cell 130 can be a winding cell, that is, it is made by winding process, of course, the battery cell 130 can also be made by laminating process, and the type of the battery cell 130 is not specifically limited herein.

[0047] In the embodiment, by forming the connecting hole 13131 on the tab 131 and inserting the fastener 123 into the connecting hole 13131 to be connected with the pole 122 and the tab 131 respectively, the laser welding mode of the tab 131 and the pole 122 is replaced, so that the reliability is higher, and the service life of the secondary battery 100 is improved.

[0048] It should be noted that when assembling the secondary battery 100, the fastener 123 can be connected with the pole 122 and the tab 131 respectively, then the battery cell 130 is placed in the accommodating cavity 111 of the shell 110, and then the top cover 121 and the shell 110 are heat fused to realize the closure of the opening 112.

[0049] Further, the fastener 123 is a rivet, and the rivet is riveted with the tab 131.

[0050] In the embodiment, the rivet is inserted into the connecting hole 13131 and riveted with the tab 131, so that the pole 122 and the tab 131 are connected without welding, and the riveting is not easy to loosen and fall off, so that the connection reliability is further improved.

[0051] Of course, for the above embodiment, the fastener 123 can also be a threaded fastener such as a screw or a bolt, an inner thread is arranged on the hole wall of the connecting hole 13131, and the outer thread of the threaded fastener is matched with the inner thread of the connecting hole 13131, which can also replace the laser welding mode to realize the electrical connection between the pole 122 and the tab 131.

[0052] As Figure 3 and Figure 6As shown, further, the connecting hole 13131 is a circular hole with a diameter of d, satisfying: 2mm≤d≤30mm.

[0053] For example, d can be selected from any value of 2mm, 3mm, 5mm, 6mm, 8mm, 10mm, 12mm, 13mm, 13.5mm, 15mm, 16mm, 16.2mm, 19mm, 20mm, 21mm, 24mm, 26mm, 28mm, 29.3mm, and 30mm, or any value in a range consisting of any two of them, without any specific limitation.

[0054] It should be noted that if the value of d is too large, the size of the fastener 123 needs to be increased accordingly, thereby increasing the manufacturing cost of the secondary battery 100. If the value of d is too small, the size of the fastener 123 needs to be reduced accordingly, thereby affecting the connection reliability between the terminal 122 and the terminal tab 131.

[0055] In this embodiment, by controlling the diameter d of the circular connection hole 13131 within the range of 2 mm to 30 mm, the manufacturing cost of the secondary battery 100 can be reduced while ensuring high connection reliability between the electrode post 122 and the tab 131 .

[0056] like Figure 2 、 Figure 3 and Figure 6 As shown, further, the tab 131 includes a main body 1311, a first connecting portion 1312 and a second connecting portion 1313, the first connecting portion 1312 is connected between the main body 1311 and the second connecting portion 1313, and the second connecting portion 1313 is provided with a connecting hole 13131 passing through it, that is, the connecting hole 13131 passes through the second connecting portion 1313, and there is a gap 13132 between the second connecting portion 1313 and the main body 1311.

[0057] In this embodiment, since there is a gap 13132 between the second connecting portion 1313 and the main body 1311, the gap 13132 can reduce the risk of the fastener 123 contacting the main body 1311 to form a loop and causing the secondary battery 100 to short-circuit, thereby improving the safety of the secondary battery 100.

[0058] like Figure 3 and Figure 6 As shown, further, the second connection portion 1313 is in a sheet shape and is disposed on a side of the top cover 121 facing the battery cell 130 .

[0059] In the embodiment, the second connecting portion 1313 is in a sheet shape, and the second connecting portion 1313 is attached to the top cover 121, so that the space occupied by the tab 131 is reduced, and the space for the body portion of the battery cell 130 is reserved. Accordingly, the space occupancy of the battery cell 130 can be increased by increasing the size of the body portion of the battery cell 130, so that the energy density of the secondary battery 100 is improved.

[0060] Further, the side of the second connecting portion 1313 away from the main body portion 1311 is connected to the top cover 121.

[0061] In the embodiment, the side of the second connecting portion 1313 away from the main body portion 1311 is connected to the top cover 121, so that the relative movement between the second connecting portion 1313 and the fastener 123 is limited, and the connection reliability of the fastener 123 and the tab 131 is improved.

[0062] Further, the battery cell 130 can be connected to at least one inner wall of the shell 110, for example, the inner bottom wall of the shell 110, or the inner bottom wall and one of the side walls of the shell 110. In this way, the movement of the battery cell 130 relative to the shell 110 is limited, the stability of the battery cell 130 is improved, the connection reliability of the fastener 123 and the tab 131 is improved, and the risk of the fastener 123 falling off the tab 131 is reduced.

[0063] As shown in FIG. 1, Figure 2 In one embodiment, a plurality of reinforcing grooves 113 are formed on the outer side of the shell 110, and adjacent two reinforcing grooves 113 are spaced apart.

[0064] For example, the number of reinforcing grooves 113 can be two, three, four, five, six, etc., which is not limited here.

[0065] In the embodiment, a plurality of reinforcing grooves 113 are formed on the outer side of the shell 110, so that the structural strength and stability of the shell 110 are improved, and the use safety of the secondary battery 100 is improved. At the same time, the shell 110 with the plurality of reinforcing grooves 113 has a lighter weight, so that the overall weight of the secondary battery 100 is reduced.

[0066] As shown in FIG. 1, Figure 4 and Figure 5 In one embodiment, the wall thickness of the shell 110 is T, and 0.5mm≤T≤20mm is satisfied.

[0067] Exemplarily, the wall thickness T of the shell 110 can be selected as any value among 0.5mm, 0.6mm, 0.8mm, 1mm, 2mm, 2.1mm, 2.2mm, 2.5mm, 3mm, 4mm, 4.5mm, 5mm, 5.6mm, 7mm, 8mm, 10mm, 11mm, 12mm, 13.2mm, 15mm, 16mm, 18mm, 18.1mm, 19mm, 20mm or any value in a range consisting of any two of them, and no specific limitation is made here.

[0068] It should be noted that if the value of T is too large, the housing 110 will occupy too much space, affecting the energy density of the secondary battery 100. If the value of T is too small, the structural stability and strength of the housing 110 will be reduced, affecting the safety of the secondary battery 100.

[0069] In this embodiment, by controlling the wall thickness T of the housing 110 within a range of 0.5 mm to 20 mm, the safety of the secondary battery 100 can be improved while the secondary battery 100 has a higher energy density.

[0070] In a second aspect, an embodiment of the present application provides an electrical device, comprising the secondary battery 100 in any one of the embodiments of the first aspect.

[0071] It is understandable that since the electrical device provided in this embodiment has the secondary battery 100 in any of the embodiments of the first aspect above, it has all the beneficial effects of the secondary battery 100, which will not be described in detail here.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0073] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A secondary battery, characterized in that: include: The housing is made of a plastic material and is integrally formed. The housing has a receiving cavity for receiving the aqueous electrolyte and is provided with an opening communicating with the receiving cavity. The top cover assembly comprises a top cover integrally formed from the plastic material, wherein the top cover is connected to a side of the shell where the opening is formed by thermal melting to close the opening.

2. The secondary battery according to claim 1, wherein The plastic material is one of polyphenylene sulfide, polypropylene, acrylonitrile-styrene-butadiene copolymer and polyethylene terephthalate.

3. The secondary battery according to claim 1, wherein The secondary battery also includes a battery cell located in the accommodating cavity, and the top cover assembly also includes a pole and a fastener. The battery cell has a pole ear, and a connecting hole is opened on the pole ear. The pole is connected to the top cover. One end of the fastener is passed through the connecting hole and connected to the pole ear, and the end of the fastener away from the battery cell is connected to the pole to realize electrical connection between the battery cell and the pole.

4. The secondary battery according to claim 3, wherein The fastener is a rivet, and the rivet is riveted to the tab.

5. The secondary battery according to claim 3, wherein The connecting hole is a circular hole with a diameter d, which satisfies: 2mm≤d≤30mm.

6. The secondary battery according to any one of claims 3 to 5, characterized in that The tab includes a main body, a first connecting part and a second connecting part. The first connecting part is connected between the main body and the second connecting part. The second connecting part is provided with the connecting hole passing through the second connecting part. There is a gap between the second connecting part and the main body.

7. The secondary battery according to claim 6, characterized in that The second connecting portion is in a sheet shape and is arranged to be attached to a side of the top cover facing the battery core.

8. The secondary battery according to claim 6, wherein The second connecting portion is connected to the top cover at a side facing away from the main body.

9. The secondary battery according to claim 6, wherein The battery core is connected to at least one inner wall of the shell.

10. An electrical device, characterized in that: A secondary battery comprising the secondary battery according to any one of claims 1 to 9.

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