Battery monomer and electric equipment

Abstract

The utility model relates to a battery monomer and electric equipment, including battery cell and top cover subassembly, the top cover subassembly has the liquid inlet hole, the side of top cover subassembly close to battery cell is equipped with first cover body and sleeve the second cover body outside first cover body, the end of first cover body far away from battery cell is connected with top cover subassembly and is communicated with the liquid inlet hole, and the end of second cover body far away from battery cell is equipped with the liquid inlet hole. One end, close to the battery cell, of the first cover body is closed; a liquid passing hole is formed in the peripheral side wall of the first cover body; a containing cavity communicated with the liquid passing hole is formed between the second cover body and the first cover body, a liquid outlet hole communicated with the containing cavity is formed in the end, away from the top cover assembly, of the second cover body, and the end, away from the top cover assembly, of the second cover body abuts against the battery cell. According to the single battery disclosed by the utility model, the impact on the battery cell can be reduced during liquid injection, a certain amount of electrolyte can be stored to facilitate subsequent liquid supplementation for the battery cell, and the problem of electrolyte overflow can be relieved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cell and an electrical equipment. Background Art

[0002] With the development of technology, power batteries, as an energy device, have attracted more and more attention and have been widely used in fields such as mobile phones, electric vehicles, and power tools. At present, the injection port on the battery cover of a lithium battery usually has a relatively simple structure, that is, the injection port is a through-hole structure. When the injection machine injects liquid, the electrolyte will directly impact the battery cell, which may damage the internal structure of the battery cell. Content of the Utility Model

[0003] To solve the above technical problems, the utility model provides a battery cell and an electrical equipment, realizing automatic replenishment of the electrolyte at the upper end of the bare battery cell.

[0004] For this purpose, the utility model provides a battery cell, including a battery cell and a top cover assembly. The top cover assembly has a liquid inlet hole. A first cover body is arranged on one side of the top cover assembly close to the battery cell, and a second cover body is sleeved outside the first cover body. One end of the first cover body far from the battery cell is connected to the top cover assembly and communicated with the liquid inlet hole, and one end of the first cover body close to the battery cell is closed; a liquid passing hole is arranged on the peripheral side wall of the first cover body; a receiving cavity communicated with the liquid passing hole is formed between the second cover body and the first cover body, and a liquid outlet hole communicated with the receiving cavity is arranged at one end of the second cover body far from the top cover assembly, and one end of the second cover body far from the top cover assembly abuts against the battery cell.

[0005] Further, the top cover assembly includes an insulating plate, and the liquid inlet hole is arranged on the insulating plate; the insulating plate and the first cover body are integrally formed; a first cavity of the first cover body is communicated with the liquid inlet hole.

[0006] Further, the second cover body and the insulating plate are integrally formed.

[0007] Further, the second cover body has a second cavity in the shape of a truncated cone, and the second cavity penetrates through one end of the second cover body close to the battery cell to form the liquid outlet hole; the diameter of the liquid outlet hole is smaller than the diameter of one end of the second cavity far from the battery cell.

[0008] Further, the second cover body is in the shape of a truncated cone, the diameter of one end of the second cover body close to the battery cell is 3-4 mm; the diameter of one end of the second cover body far from the battery cell is 6-8 mm; along the direction from the top cover assembly to the battery cell, the length of the second cover body is 30-50 mm.

[0009] Further, the first cover body has a first cavity in the shape of a frustum of a cone, the first cavity penetrates through one end of the first cover body away from the battery cell, and the diameter of one end of the first cavity close to the battery cell is smaller than the diameter of one end of the first cavity away from the battery cell.

[0010] Further, the first cover body is in the shape of a frustum of a cone, and the diameter of one end of the first cover body close to the battery cell is smaller than the diameter of one end of the first cover body away from the battery cell.

[0011] Further, there is a gap between one end of the first cover body close to the battery cell and the battery cell.

[0012] Further, a plurality of liquid passing holes are provided, and the diameters of the plurality of liquid passing holes are all smaller than the diameter of the liquid inlet hole.

[0013] The present utility model further provides an electrical equipment, which is characterized by including the battery cell described above.

[0014] The above technical solution of the present utility model has the following advantages compared with the prior art:

[0015] For the battery cell and the electrical equipment of the present utility model, the electrolyte injected by the liquid injection machine first enters the first cover body, and flows through the liquid passing holes on the side wall of the first cover body to the accommodation cavity between the first cover body and the second cover body, and then enters the battery cell through the liquid outlet hole at the bottom of the second cover body. First, the electrolyte is intercepted by the first cover body during the process of entering the accommodation cavity, which relieves the impact force of the electrolyte flow during injection on the battery cell, and thus avoids damage to the internal structure of the battery cell; secondly, since the bottom of the second cover body abuts against the end face of the battery cell, when the battery cell can no longer absorb the electrolyte, the continuously injected electrolyte will be stored in the accommodation cavity between the first cover body and the second cover body for subsequent replenishment of the battery cell; thirdly, when the electrolyte in the accommodation cavity overflows, it will be intercepted by the first cover body, and the electrolyte infiltrating into the battery cell is not easy to overflow, so the proportion of electrolyte overflow is reduced, saving the labor cost and efficiency of battery wiping. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to the specific embodiments of the present utility model in conjunction with the drawings.

[0017] Figure 1 It is a schematic structural diagram of the battery cell in the present utility model;

[0018] Figure 2 It is a schematic structural diagram of the insulating part in the present utility model.

[0019] Description of the reference numerals in the accompanying drawings: 1. Battery cell; 2. Insulating member; 21. Insulating plate; 211. Liquid inlet hole; 22. First cover body; 221. Liquid passing hole; 23. Second cover body; 231. Accommodating cavity. Detailed implementation mode

[0020] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the specific embodiments cited do not limit the present utility model.

[0021] The battery cell is the basic unit for realizing the mutual conversion of chemical energy and electrical energy. The battery cell in this application may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., and this application does not limit this. The battery cell can be in a cylindrical shape, a flat shape, a cuboid shape or other shapes, etc., and this application does not limit this either.

[0022] When assembling the battery cell, it includes the main steps of preparing the electrode, assembling the battery cell, assembling the outer shell, and injecting liquid. When assembling the outer shell, first connect the tab of the battery cell to the pole column on the top cover assembly, then place the battery cell into the battery housing, and connect the top cover assembly to the open top of the battery housing. When injecting liquid, inject the electrolyte from the liquid inlet hole on the top cover assembly into the battery housing, so that the electrolyte wets the battery cell.

[0023] See Figure 1 and Figure 2 As shown in the figure, an embodiment of the battery cell provided by the present utility model.

[0024] The above-mentioned battery cell includes a battery cell 1 and a top cover assembly. The above-mentioned top cover assembly has a liquid inlet hole 211. A first cover body 22 is arranged on one side of the above-mentioned top cover assembly close to the above-mentioned battery cell 1, and a second cover body 23 is sleeved outside the above-mentioned first cover body 22. One end of the above-mentioned first cover body 22 far from the above-mentioned battery cell 1 is connected to the above-mentioned top cover assembly and communicated with the above-mentioned liquid inlet hole 211, and one end of the above-mentioned first cover body 22 close to the above-mentioned battery cell 1 is closed; a liquid passing hole 221 is arranged on the circumferential side wall of the above-mentioned first cover body 22; an accommodating cavity 231 communicated with the above-mentioned liquid passing hole 221 is formed between the above-mentioned second cover body 23 and the above-mentioned first cover body 22, and a liquid outlet hole communicated with the above-mentioned accommodating cavity 231 is arranged at one end of the above-mentioned second cover body 23 far from the above-mentioned top cover assembly, and one end of the above-mentioned second cover body 23 far from the above-mentioned top cover assembly abuts against the above-mentioned battery cell 1.

[0025] The circumferential side walls of the first cover 22 and the circumferential side walls of the second cover 23 are both in the shape of cylindrical walls. The second cover 23 is sleeved outside the first cover 22, that is, the circumferential side wall of the second cover 23 surrounds the circumferential side wall of the first cover 22, and the circumferential side wall of the first cover 22 and the circumferential side wall of the second cover 23 do not contact each other or are in partial contact. The liquid inlet hole 211, the inner cavity of the first cover 22, the liquid passing hole 221, the accommodating cavity 231, and the liquid outlet hole are connected in sequence to form a conveying channel for the electrolyte, and the conveying channel of the electrolyte is not a straight and smooth channel.

[0026] The electrolyte injected from the liquid injection machine first enters the first cover 22 and flows through the liquid passing hole 221 on the side wall of the first cover 22 into the accommodating cavity 231 between the first cover 22 and the second cover 23, and then enters the battery cell 1 from the liquid outlet hole at the bottom of the second cover 23. First, when the electrolyte enters the accommodating cavity 231, it is intercepted by the first cover 22, alleviating the impact force of the flowing electrolyte during liquid injection on the battery cell 1, thereby avoiding damage to the internal structure of the battery cell 1; second, since the bottom of the second cover 23 abuts against the end face of the battery cell 1, on the one hand, the second cover 23 can prevent the battery cell 1 from moving; on the other hand, when the battery cell 1 can no longer absorb the electrolyte, the continuously injected electrolyte will be stored in the accommodating cavity 231 between the first cover 22 and the second cover 23 for subsequent replenishment of the battery cell 1; third, when the electrolyte in the accommodating cavity 231 overflows, it will be intercepted by the first cover 22, and the electrolyte infiltrating into the battery cell 1 is not easy to overflow, and when the electrolyte entering the bottom of the battery housing overflows, it will be intercepted by the battery cell 1, so the proportion of electrolyte overflow is reduced, saving the labor cost and efficiency of battery wiping.

[0027] In a preferred implementation manner of this embodiment, the top cover assembly includes an insulating plate 21, and the liquid inlet hole 211 is provided on the insulating plate 21; the insulating plate 21 and the first cover 22 are integrally formed; the first cavity of the first cover 22 is communicated with the liquid inlet hole 211.

[0028] The top cover assembly closes the open opening of the battery housing. The pole column on the top cover assembly is electrically connected to the pole ear of the battery cell 1, and the rest of the top cover assembly needs to be insulated from the battery cell 1. Therefore, the insulating plate 21 is provided to realize the insulation isolation between the battery cell 1 and the non-pole-column part of the top cover assembly. The insulating plate 21 is made of an insulating material, such as a plastic material. The first cover 22 and the insulating plate 21 are made of the same material. The insulating plate 21 is generally injection-molded, and the liquid inlet 211 and the first cover 22 are integrally formed when the insulating plate 21 is injection-molded, and the manufacturing efficiency of the insulating plate 21 is higher.

[0029] In other embodiments, it may also be that the first cover body and the insulating plate are of a split structure, and after the first cover body and the insulating plate are respectively manufactured, they are connected together, or after the first cover body is manufactured, it is used as an insert during the injection molding of the insulating plate and is injection-molded and connected to the insulating plate.

[0030] In a preferred embodiment of this embodiment, the second cover body 23 and the insulating plate 21 are integrally formed.

[0031] The second cover body 23 and the insulating plate 21 are made of the same material, and the second cover body 23 is integrally formed during the injection molding of the insulating plate 21, so that the manufacturing efficiency of the top cover assembly is higher.

[0032] In other embodiments, it may also be that the second cover body and the insulating plate are of a split structure, and after the second cover body and the insulating plate are respectively manufactured, they are connected together, or after the second cover body is manufactured, it is used as an insert during the injection molding of the insulating plate and is injection-molded and connected to the insulating plate.

[0033] In a preferred embodiment of this embodiment, the second cover body 23 has a second cavity in the shape of a frustum of a cone, and the second cavity penetrates through one end of the second cover body 23 close to the battery cell 1 to form the liquid outlet hole; the diameter of the liquid outlet hole is smaller than the diameter of the end of the second cavity far from the battery cell 1.

[0034] The inner cavity of the second cover body 23 is in the shape of a frustum of a cone, that is, the inner surface of the second cover body 23 is a conical surface, and the inner surface of the second cover body 23 can be completely attached to the outer side surface of the frustum of a cone. On the one hand, the frustum-of-a-cone-shaped inner cavity of the second cover body can promote the flow of the electrolyte and reduce the eddy current effect of the flow rate. On the other hand, the electrolyte entering the accommodation cavity 231 will hit the inner surface of the second cover body 23, and then slide along the inner surface of the second cover body 23 to the battery cell, further reducing the impact force of the electrolyte on the battery cell 1 during liquid injection.

[0035] In other embodiments, it may also be that the inner cavity of the second cover body is in the shape of a cylinder with a circular cross-section, or an elliptic cylinder with an elliptical cross-section, or a polygonal column or a frustum of a pyramid with a polygonal cross-section.

[0036] In a preferred embodiment of this embodiment, the second cover body 23 is in the shape of a frustum of a cone, the diameter of one end of the second cover body 23 close to the battery cell 1 is 3-4 mm; the diameter of the end of the second cover body 23 far from the battery cell 1 is 6-8 mm; along the direction from the top cover assembly to the battery cell 1, the length of the second cover body 23 is 30-50 mm.

[0037] The above-mentioned second cover body 23 is in the shape of a frustum of a cone, that is, the outer surface of the circumferential side wall of the second cover body 23 is consistent with the outer side surface of the frustum of a cone. The outer surface of the second cover body 23 is a conical surface. The second cover body 23 occupies less space and has a more compact structure. The dimensions of each part of the second cover body 23 are set within a certain range. The diameter of the end of the second cover body 23 close to the above-mentioned battery cell 1 is 3 mm or 3.5 mm or 4 mm, and the diameter of the end of the second cover body 23 far from the above-mentioned battery cell 1 is 6 mm or 7 mm or 8 mm; the length of the second cover body 23 is 30 mm or 35 mm or 40 mm or 45 mm or 50 mm. The diameter of the liquid outlet hole is 0.5 mm or 1 mm or 1.5 mm. The above-mentioned dimensions of the second cover body 23 are applicable to the dimensions of existing battery monomers and can realize the liquid injection function.

[0038] In other embodiments, it may also be that the above-mentioned second cover body is in the shape of a cylinder with a circular cross-section, or an elliptic cylinder with an elliptical cross-section, or a polygonal column and a frustum of a pyramid with a polygonal cross-section, etc.

[0039] In the preferred implementation mode of this embodiment, the above-mentioned first cover body 22 has a first cavity in the shape of a frustum of a cone. The first cavity penetrates through the end of the first cover body 22 far from the above-mentioned battery cell 1, and the diameter of the end of the first cavity close to the above-mentioned battery cell 1 is smaller than the diameter of the end of the first cavity far from the above-mentioned battery cell 1.

[0040] The inner cavity of the first cover body 22 is in the shape of a frustum of a cone, that is, the inner surface of the first cover body 22 is a conical surface, and the inner surface of the first cover body 22 can be completely attached to the outer side surface of the frustum of a cone. The frustum-of-a-cone-shaped inner cavity of the first cover body 22 can promote the flow of the electrolyte and reduce the eddy current effect of the flow rate.

[0041] In other embodiments, it may also be that the inner cavity of the above-mentioned first cover body is in the shape of a cylinder with a circular cross-section, or an elliptic cylinder with an elliptical cross-section, or a polygonal column and a frustum of a pyramid with a polygonal cross-section, etc.

[0042] In the preferred implementation mode of this embodiment, the above-mentioned first cover body 22 is in the shape of a frustum of a cone, and the diameter of the end of the first cover body 22 close to the above-mentioned battery cell 1 is smaller than the diameter of the end of the first cover body 22 far from the above-mentioned battery cell 1.

[0043] The above-mentioned first cover body 22 is in the shape of a frustum of a cone, that is, the outer surface of the circumferential side wall of the first cover body 22 is consistent with the outer side surface of the frustum of a cone. The outer surface of the first cover body 22 is a conical surface. The first cover body 22 and the second cover body 23 are convenient to be sleeved with each other and form a suitable accommodating cavity 231.

[0044] In other embodiments, it may also be that the above-mentioned first cover body is in the shape of a cylinder with a circular cross-section, or an elliptic cylinder with an elliptical cross-section, or a polygonal column and a frustum of a pyramid with a polygonal cross-section, etc.

[0045] In a preferred embodiment of the present embodiment, there is a gap between one end of the first cover 22 close to the battery cell 1 and the battery cell 1.

[0046] One end of the first cover 22 close to the battery cell 1 is spaced apart from the battery cell 1 by a certain distance. Therefore, when the electrolyte is stored in the accommodation cavity 231 between the first cover 22 and the second cover 23, the electrolyte will also be stored between the battery cell and the first cover 22. More electrolyte is accommodated in the accommodation cavity 231, and the area of the region where the battery cell 1 receives the electrolyte is larger, so that the battery cell 1 can better absorb the electrolyte.

[0047] In other embodiments, it may also be that one end of the first cover close to the battery cell abuts against the battery cell.

[0048] In a preferred embodiment of the present embodiment, a plurality of liquid passing holes 221 are provided, and the apertures of the plurality of liquid passing holes 221 are all smaller than the aperture of the liquid inlet hole 211.

[0049] The electrolyte in the first cover 22 is discharged from the plurality of liquid passing holes 221 into the accommodation cavity 231, and then falls onto the top end face of the battery cell 1 facing the liquid outlet hole. The liquid passing holes 221 are provided in plurality and the apertures of the liquid passing holes 221 are smaller than the aperture of the liquid inlet hole 211, so that the electrolyte is evenly sprayed out from the plurality of liquid passing holes, further reducing the impact force of the electrolyte on the battery cell during liquid injection. The number and arrangement mode of the liquid passing holes 221 can be set according to actual needs as long as the electrolyte can be evenly sprayed on the end face of the battery cell. For example, 3 or 4 or 5 of the above-mentioned liquid passing holes are provided, and the plurality of liquid passing holes 221 are evenly distributed around the central axis of the liquid inlet hole 211.

[0050] In other embodiments, it may also be that one liquid passing hole is provided, and the aperture of the liquid passing hole is larger than the aperture of the liquid inlet hole.

[0051] The present utility model further provides an electrical device, including the above-mentioned battery cell. The above-mentioned electrical device may be an automobile, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The automobile may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, a planer, etc. The embodiments of the present application do not make special limitations on the above-mentioned electrical devices.

[0052] Obviously, the above embodiments are only examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the creation of the present utility model.

Claims

1. A battery cell, characterized in that: The invention comprises a battery cell (1) and a top cover assembly, wherein the top cover assembly has a liquid inlet hole (211), a first cover body (22) and a second cover body (23) sleeved outside the first cover body (22) are arranged on a side of the top cover assembly close to the battery cell (1), an end of the first cover body (22) away from the battery cell (1) is connected to the top cover assembly and communicates with the liquid inlet hole (211), and an end of the first cover body (22) close to the battery cell (1) is closed; a liquid passage hole (221) is arranged on the peripheral side wall of the first cover body (22); a receiving cavity (231) communicated with the liquid passage hole (221) is formed between the second cover body (23) and the first cover body (22), a liquid outlet hole communicated with the receiving cavity (231) is arranged on an end of the second cover body (23) away from the top cover assembly, and an end of the second cover body (23) away from the top cover assembly abuts against the battery cell (1).

2. The battery cell according to claim 1, characterized in that: The top cover assembly comprises an insulating plate (21), the liquid inlet hole (211) being arranged on the insulating plate (21); the insulating plate (21) and the first cover body (22) are integrally formed; and the first cavity of the first cover body (22) is in communication with the liquid inlet hole (211).

3. The battery cell according to claim 2, characterized in that: The second cover body (23) and the insulating plate (21) are integrally formed.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The second cover body (23) has a second cavity in the shape of a truncated cone, the second cavity penetrates one end of the second cover body (23) close to the battery cell (1) and forms the liquid outlet hole; the diameter of the liquid outlet hole is smaller than the diameter of one end of the second cavity away from the battery cell (1).

5. The battery cell according to claim 4, characterized in that: The second cover body (23) is in the shape of a truncated cone, and the diameter of the end of the second cover body (23) close to the battery cell (1) is 3-4 mm; the diameter of the end of the second cover body (23) away from the battery cell (1) is 6-8 mm; along the direction from the top cover assembly to the battery cell (1), the length of the second cover body (23) is 30-50 mm.

6. The battery cell according to claim 4, characterized in that: The first cover (22) has a first cavity in the shape of a truncated cone, the first cavity passes through an end of the first cover (22) away from the battery cell (1), and the diameter of an end of the first cavity close to the battery cell (1) is smaller than the diameter of an end of the first cavity away from the battery cell (1).

7. The battery cell according to claim 6, characterized in that: The first cover body (22) is in the shape of a truncated cone, and the diameter of one end of the first cover body (22) disposed close to the battery core (1) is smaller than the diameter of one end of the first cover body (22) disposed away from the battery core (1).

8. The battery cell according to any one of claims 1 to 3, characterized in that: There is a gap between one end of the first cover (22) close to the battery core (1) and the battery core (1).

9. The battery cell according to any one of claims 1 to 3, characterized in that: A plurality of the liquid passage holes (221) are provided, and the apertures of the plurality of liquid passage holes (221) are all smaller than the aperture of the liquid inlet hole (211).

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

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