Battery cell, battery and electric device

Abstract

The utility model relates to a battery monomer, a battery and a power utilization device, and belongs to the technical field of battery manufacturing. The battery cell comprises: a housing provided with a liquid injection hole; the liquid injection hole is sealed by the first plugging piece, the first plugging piece is provided with a first cut, and an external liquid injection head can be inserted into the first cut so as to inject electrolyte into the shell. The battery monomer has relatively high safety performance and relatively long service life. The utility model further provides a battery and a power utilization device. The battery comprises the battery monomer.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and more specifically, to a battery cell, a battery, and an electrical device. Background Technology

[0002] Lithium batteries have advantages such as high energy density, high voltage, and environmental friendliness, and have gradually replaced traditional energy industries in recent years, with manufacturing levels developing rapidly.

[0003] During the electrolyte injection process of a battery cell, the injection head needs to be inserted into the battery's injection hole. Electrolyte is injected into the battery by applying pressure and drawing a vacuum simultaneously. Ensuring smooth electrolyte injection while mitigating electrolyte leakage and splashing, and promptly removing gas from inside the battery, will improve the safety performance of the battery cell and extend its service life. Utility Model Content

[0004] Therefore, this application proposes a battery cell, a battery, and an electrical device that have high safety performance and a long service life.

[0005] The battery cell of the first aspect of this application includes: a housing, the housing having an injection hole; and a first sealing member for sealing the injection hole, the first sealing member having a first slit for inserting an external injection head to inject electrolyte into the interior of the housing.

[0006] Optionally, the housing is further provided with an exhaust vent, and the battery cell further includes a waterproof and breathable membrane to seal the exhaust vent.

[0007] Optionally, the battery cell further includes: a second sealing member for sealing the vent hole, the second sealing member having a second slit for venting during liquid injection; the waterproof and breathable membrane is disposed on the side of the second sealing member facing the inside of the housing, and the second sealing member is fitted together.

[0008] Optionally, the diameters of the second sealing element and the waterproof and breathable membrane are both d2, the diameter of the vent is D3, and the inner wall of the vent is provided with a second mounting groove, the diameter of which is D4, satisfying the following:

[0009] 2D3>d2, d2=D4, D4>D3.

[0010] Optionally, the diameter of the injection hole is D1, and the diameter of the vent hole is D3, satisfying:

[0011] D3 > D1.

[0012] Optionally, the diameter of the first sealing element is d1, the diameter of the injection hole is D1, the diameter of the injection head is C, and the inner wall of the injection hole is provided with a first mounting groove, the diameter of the first mounting groove being D2, satisfying:

[0013] 2D1>d1, d1=D2, D2>D1>C.

[0014] Optionally, the first slit is one of a cross shape, a straight line shape, and a star shape, and / or

[0015] The second cut is one of the following: cross-shaped, straight, or rice-shaped.

[0016] Optionally, the diameter of the first sealing element is d1, the first slit includes at least one first single slit, and the length of the first single slit is L1, satisfying: 0.5d1≤L1≤0.9d1, and / or

[0017] The diameter of the second sealing element is d2, and the second slit includes at least one second single slit, the length of which is L2, satisfying: 0.5d2≤L2≤0.9d2.

[0018] The battery of the second aspect embodiment of this application includes the battery cell of the first aspect embodiment of this application.

[0019] The electrical device according to the third aspect of this application includes the battery according to the second aspect of this application, or includes a single battery cell according to the first aspect of this application.

[0020] Compared with existing technologies, this solution has the following advantages:

[0021] In this embodiment of the application, the electrolyte filling hole of the battery cell is sealed with a first sealing member. During the electrolyte filling process, the external filling head is inserted into the first slot of the first sealing member, and the first slot is opened to inject electrolyte into the inside of the casing. The first slot is tightly fitted with the peripheral side of the filling head. After the electrolyte filling is completed, the filling head retracts and the first slot closes automatically, which alleviates the phenomenon of electrolyte leakage and splashing, improves the safety performance of the battery, and extends the service life of the battery.

[0022] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a single battery cell provided in an embodiment of this application;

[0025] Figure 2 This is a schematic diagram of the internal structure of a battery cell provided in an embodiment of this application;

[0026] Figure 3 A partial schematic diagram of the liquid injection hole and vent hole of a battery cell provided in an embodiment of this application;

[0027] Figure 4 , Figure 5 and Figure 6 These are schematic diagrams of the structures of the first sealing element in three forms for a single battery cell provided in the embodiments of this application;

[0028] Figure 7 This is a schematic diagram of the structure of the second sealing component of the battery cell provided in the embodiments of this application.

[0029] Icons: 100 - Battery cell; 110 - Casing body; 120 - Cover; 121 - Injection hole; 1211 - First mounting slot; 122 - Vent hole; 1221 - Second mounting slot; 130 - First sealing element; 131 - First slit; 140 - Second sealing element; 141 - Second slit; 150 - Waterproof and breathable membrane; 160 - Terminal post; 200 - Injection head; X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments of this application, the battery cell 100 includes a housing and a first sealing member 130. The housing is provided with an injection hole 121. The first sealing member 130 closes the injection hole 121. The first sealing member 130 has a first slit 131 for inserting an external injection head 200 to inject electrolyte into the interior of the housing.

[0033] In this embodiment, the outer casing includes a casing body 110 and a cover 120. The cover 120 closes the opening of the casing body 110, and an injection hole 121 is disposed on the cover 120. The thickness of the cover 120 is greater than the wall thickness of the casing body, and the injection hole 121 does not affect the mechanical strength of the cover 120. In some other embodiments, the injection hole 121 may also be disposed on the casing body 110, for example, on the side wall or bottom wall of the casing body 110, and this application does not limit this.

[0034] The first sealing element 130 is made of rubber. The first slit 131 can be opened when a foreign object is inserted or when the internal air pressure is too high, and it remains closed under normal conditions. The first slit 131 can be cross-shaped, straight, star-shaped, etc. The first slit 131 can be centrally located on the first sealing element 130 or it can be located off-center from the center of the first sealing element 130.

[0035] The battery cell 100 can be a prismatic battery or a cylindrical battery; the thickness direction of the cover 120 extends along the third direction Z, and the liquid injection hole 121 penetrates the cover 120 along the third direction Z. The liquid injection hole 121 can be a round hole or an elliptical hole, or it can be other shapes; the shape of the first sealing member 130 matches the liquid injection hole 121. The first sealing member 130 can be disposed on one surface of the cover 120 in the thickness direction, or it can be embedded in the inner wall of the liquid injection hole 121.

[0036] In this embodiment, the electrolyte injection hole 121 of the battery cell 100 is sealed with a first sealing member 130. During the electrolyte injection process, the external injection head 200 is inserted into the first slit 131 of the first sealing member 130, opening the first slit 131 to inject electrolyte into the interior of the housing body 110. The first slit 131 is tightly fitted with the peripheral side of the injection head 200. After the electrolyte injection is completed, the injection head 200 retracts, and the first slit 131 automatically closes, which alleviates the phenomenon of electrolyte leakage and splashing, improves the safety performance of the battery, and extends the service life of the battery.

[0037] like Figure 3As shown, in some embodiments of this application, the diameter of the first sealing member 130 is d1, the diameter of the injection hole 121 is D1, the diameter of the injection head 200 is C, and the inner wall of the injection hole 121 is provided with a first mounting groove 1211, the diameter of the first mounting groove 1211 being D2, satisfying:

[0038] 2D1>d1, d1=D2, D2>D1>C.

[0039] The injection hole 121 is a round hole, and the first sealing component 130 is a circular structure.

[0040] With this configuration, the injection head 200 can be smoothly inserted into the first slit 131, and the first sealing member 130 can be reliably fixed in the injection hole 121 and is easy to assemble. When the edge of the first sealing member 130 is inserted into the first mounting groove 1211, the first sealing member 130 will not be damaged.

[0041] The first mounting groove 1211 is formed by a recess in the inner wall of the injection hole 121, and extends circumferentially along the injection hole 121. The first mounting groove 1211 can extend continuously to form an annular groove structure. The edge of the first sealing member 130 is inserted into the first mounting groove 1211, thereby being embedded in the injection hole 121. Multiple first mounting grooves 1211 can also be provided, and multiple first mounting grooves 1211 are spaced apart circumferentially around the injection hole 121. Correspondingly, the edge of the first sealing member 130 is provided with multiple insertion parts circumferentially. The insertion parts are inserted into the corresponding first mounting grooves 1211, so that the first sealing member 130 is embedded in the injection hole 121.

[0042] like Figure 3 As shown, in some embodiments of this application, the cover 120 is also provided with an exhaust hole 122, and the battery cell 100 also includes a waterproof and breathable membrane 150 to seal the exhaust hole 122.

[0043] The vent 122 penetrates the cover 120 along the third direction Z. During the pressurized liquid injection process, a vacuum is simultaneously drawn inside the main body 110, and the gas inside the main body 110 is discharged through the vent 122. The vent 122 can be a round hole or an elliptical hole, or other shapes. The shape of the waterproof and breathable membrane 150 matches the vent 122. The waterproof and breathable membrane 150 can be disposed on one surface of the cover 120 in the thickness direction, or it can be embedded in the inner wall of the vent 122. The waterproof and breathable membrane 150 is made of polytetrafluoroethylene, polyester fiber, or polyurethane, etc.

[0044] like Figure 1 and Figure 2As shown, the cover 120 extends along the first direction X in the length direction and along the second direction Y in the width direction. The liquid injection hole 121 and the vent hole 122 are spaced apart along the first direction X on the cover 120. The battery cell 100 also includes an electrode assembly and two terminals 160 with opposite polarities. The electrode assembly is disposed inside the housing body 110. The cover 120 has two terminal holes, which are spaced apart along the first direction X. Each terminal 160 is installed in the corresponding terminal hole. Each terminal 160 is electrically connected to a tab of the same polarity through an adapter. The liquid injection hole 121 is disposed between the two terminals 160, and the vent hole 122 is disposed between the two terminals 160.

[0045] This design allows air to be expelled from inside the housing body 110 during the electrolyte injection process, thereby reducing the internal air pressure and mitigating electrolyte splashing.

[0046] like Figure 3 As shown, in some embodiments of this application, the diameter of the injection hole 121 is D1 and the diameter of the vent hole 122 is D3, satisfying: D3 > D1.

[0047] Both the injection hole 121 and the vent hole 122 are round holes. The diameter of the vent hole 122 is larger than that of the injection hole 121. After the injection is completed and before the sealing pin is inserted into the injection hole 121, the first slit 131 and the second slit 141 remain closed. The gas resistance at the vent hole 122 is less than that at the injection hole 121, thus making it easier to discharge gas.

[0048] With this configuration, during the subsequent movement of the battery cell 100 and the formation process, venting will be prioritized from the vent hole 122, reducing the risk of electrolyte overflow caused by venting from the injection hole 121.

[0049] like Figure 3 As shown, in some embodiments of this application, the battery cell 100 further includes a second sealing member 140 to seal the vent 122. The second sealing member 140 has a second slit 141 for venting during liquid injection. A waterproof and breathable membrane 150 is disposed on the side of the second sealing member 140 facing the interior of the housing body 110.

[0050] The second sealing element 140 is made of rubber. The second slit 141 can be opened when a foreign object is inserted or when the internal air pressure is too high, and it remains closed under normal conditions. The second slit 141 can be cross-shaped, straight, star-shaped, etc. The second slit 141 can be centered on the second sealing element 140 or offset from the second sealing element 140.

[0051] The waterproof and breathable membrane 150 and the second sealing member 140 are stacked in a third direction Z, the cover 120 closes the opening of the shell body 110, and the waterproof and breathable membrane 150 is located inside the second sealing member 140.

[0052] The shape of the second sealing member 140 matches the vent hole 122. The second sealing member 140 can be disposed on one surface in the thickness direction of the cover 120, or it can be embedded in the inner wall of the vent hole 122.

[0053] By setting the second sealing element 140, the second slit 141 can be opened outward during the venting process, and the gas inside the housing body 110 can be discharged through the waterproof and breathable membrane 150 from the second slit 141. After the venting is completed, the second slit 141 returns to the closed state, further improving the sealing effect on the basis of the waterproof and breathable membrane 150, and preventing the waterproof and breathable membrane 150 from being damaged by foreign objects.

[0054] like Figure 3 As shown, in some embodiments of this application, the waterproof and breathable membrane 150 and the second sealing member 140 are fitted together.

[0055] The waterproof and breathable membrane 150 and the second sealing component 140 can be bonded together and assembled with the cover 120 as an integral part; or they can be two independent components and assembled with the cover 120 respectively.

[0056] With this configuration, the waterproof and breathable membrane 150 abuts against the second sealing member 140 from the inside, preventing the second slit 141 from opening into the interior of the housing body 110, thereby further improving the sealing effect.

[0057] In other embodiments, a gap may also be provided between the waterproof and breathable membrane 150 and the second sealing member 140.

[0058] like Figure 3 As shown, in some embodiments of this application, the diameters of the second sealing member 140 and the waterproof and breathable membrane 150 are both d2, the diameter of the vent hole 122 is D3, and the inner wall of the vent hole 122 is provided with a second mounting groove 1221, the diameter of which is D4, satisfying the following:

[0059] 2D3>d2, d2=D4, D4>D3.

[0060] The vent 122 is a round hole, and the second sealing element 140 and the waterproof and breathable membrane 150 are both circular structures.

[0061] With this configuration, the second sealing element 140 and the waterproof and breathable membrane 150 can be reliably fixed in the injection hole 121 and are easy to assemble. When the edges of the second sealing element 140 and the waterproof and breathable membrane 150 are inserted into the first mounting groove 1211, the second sealing element 140 and the waterproof and breathable membrane 150 will not be damaged.

[0062] In other embodiments, the diameters of the second sealing element 140 and the waterproof and breathable membrane 150 may also be different; the second sealing element 140 and the waterproof and breathable membrane 150 may also be installed in separate mounting slots.

[0063] like Figure 4 , Figure 5 and Figure 6 As shown, in some embodiments of this application, the first slit 131 is one of a cross shape, a straight line shape, and a star shape, and / or the second slit 141 is one of a cross shape, a straight line shape, and a star shape.

[0064] The first sealing element 130 and the second sealing element 140 may have the same or different structures.

[0065] With this configuration, the first sealing element 130 and the second sealing element 140 have a simple structure and are easy to manufacture, and the first slit 131 and the second slit 141 will not break after multiple opening and closing.

[0066] like Figure 4 , Figure 5 and Figure 6 As shown, in some embodiments of this application, the diameter of the first sealing member 130 is d1, the first slit 131 includes at least one first single slit, and the length of the first single slit is L1, satisfying: 0.5d1≤L1≤0.9d1.

[0067] The first single scratch refers to a single scratch. For example, the first scratch 131 is in the shape of a straight line and consists of only one first single scratch; the first scratch 131 is in the shape of a cross and consists of two first single scratches that intersect in a cross shape; the first scratch 131 is in the shape of a star and consists of four first single scratches that intersect in a star shape.

[0068] This design allows the injection head 200 to be easily inserted into the first slit 131, and also ensures that the first slit 131 fits tightly against the periphery of the injection head 200 when it is opened, reducing the risk of leakage or overflow.

[0069] like Figure 7 As shown, in some embodiments of this application, the diameter of the second sealing member 140 is d2, the second slit 141 includes at least one second single slit, and the length of the second single slit is L2, satisfying: 0.5d2≤L2≤0.9d2.

[0070] The second single scratch refers to a single scratch. For example, the second scratch 141 is in the shape of a straight line and includes only one second single scratch; the second scratch 141 is in the shape of a cross and includes two second single scratches that intersect in a cross shape; the second scratch 141 is in the shape of a star and includes four second single scratches that intersect in a star shape.

[0071] This design allows the second slit 141 to be easily opened under internal air pressure, allowing gas to be released in time, and also improves the structural strength of the second sealing component 140, making it less prone to damage after long-term use.

[0072] The battery in some embodiments of this application includes a battery cell 100.

[0073] The electrical device in some embodiments of this application includes the battery in some embodiments of this application, or includes a battery cell 100.

[0074] Due to the characteristics of the battery cell 100 of this application, the batteries and electrical devices of some embodiments of this application have high safety performance and long service life.

[0075] Electrical devices can include automobiles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Automobiles can be gasoline-powered, natural gas-powered, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0076] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0077] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The outer casing is provided with a liquid injection hole (121). A first sealing element (130) seals the injection hole (121). The first sealing element (130) has a first slit (131) for inserting an external injection head (200) to inject electrolyte into the interior of the housing.

2. The battery cell according to claim 1, characterized in that, The outer casing is also provided with an exhaust vent (122), and the battery cell (100) further includes: A waterproof and breathable membrane (150) is used to seal the vent (122).

3. The battery cell according to claim 2, characterized in that, The battery cell (100) also includes: A second sealing element (140) is used to seal the vent hole (122). The second sealing element (140) has a second slit (141) for venting during the injection process. The waterproof and breathable membrane (150) is disposed on the side of the second sealing member (140) facing the inside of the outer shell, and the second sealing member (140) is fitted together.

4. The battery cell according to claim 3, characterized in that, The diameters of the second sealing element (140) and the waterproof and breathable membrane (150) are both d2, the diameter of the vent (122) is D3, and the inner wall of the vent (122) is provided with a second mounting groove (1221) with a diameter of D4, satisfying the following: 2D3>d2, d2=D4, D4>D3.

5. The battery cell according to claim 3, characterized in that, The diameter of the injection hole (121) is D1, and the diameter of the vent hole (122) is D3, satisfying the following: D3 > D1.

6. The battery cell according to claim 3, characterized in that, The diameter of the first sealing element (130) is d1, the diameter of the injection hole (121) is D1, the diameter of the injection head (200) is C, and the inner wall of the injection hole (121) is provided with a first mounting groove (1211) with a diameter of D2, satisfying the following: 2D1>d1, d1=D2, D2>D1>C.

7. The battery cell according to any one of claims 3-6, characterized in that, The first slit (131) is one of the following: cross-shaped, straight, and star-shaped, and / or The second cut (141) is one of the following: cross-shaped, straight, or rice-shaped.

8. The battery cell according to any one of claims 3-6, characterized in that, The diameter of the first sealing element (130) is d1, and the first slit (131) includes at least one first single slit, the length of which is L1, satisfying: 0.5d1≤L1≤0.9d1, and / or The diameter of the second sealing element (140) is d2, and the second slit (141) includes at least one second single slit, the length of which is L2, satisfying: 0.5d²≤L²≤0.9d².

9. A battery, characterized in that, Includes the battery cell (100) as described in any one of claims 1-8.

10. An electrical device, characterized in that, Includes the battery as described in claim 9, or includes a battery cell (100) as described in any one of claims 1-8.

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