A battery and a battery pack
Patent Information
- Application Number
- CN202521921309.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-05
- Publication Date
- 2026-09-08
- Estimated Expiration
- 2035-09-05
AI Technical Summary
因为注液孔和通孔，一般正对着极耳、或卷芯顶部，高压注入的电解液具有较大的冲击力，会对极耳造成冲击，使极耳撕裂，造成电池内阻增加或容量损失；或冲击卷芯的顶部，使隔膜翻折、正负极片掉粉、撕裂，造成电池容量损失或内部短路而发生安全事故
该电池包括下壳体、卷芯和电池顶盖，卷芯容置于下壳体内；电池顶盖包括盖板和塑胶件，盖板开设有注液孔；塑胶件位于卷芯顶面和盖板之间；塑胶件包括塑胶件本体和凸台，塑胶件本体连接于盖板的下方；塑胶件本体远离盖板的一侧凸设有凸台；塑胶件本体开设有连通槽，连通槽与注液孔连通，且连通槽与凸台对应设置；凸台开设有进液孔，进液孔与连通槽连通；进液孔与下壳体的内部连通，以使通入的电解液能够依次通过注液孔、连通槽和进液孔流入电池内部，浸润卷芯。通过设置凸台，物理上隔离了注液孔和卷芯顶部的敏感区域，使得从注液孔下来的电解液不会直接冲击到卷芯，而是先被引导至凸台区域，使其有一段缓冲区域。此外，进液孔靠近盖板的一端的孔径比远离盖板的一端的孔径小。这样设计可使得电解液由较窄空间流向较大空间时，发生扩散和减速，从而实现电解液经进液孔时进行缓冲和减速，以减少或避免电解液对极耳或卷芯的冲击，从而避免出现极耳撕裂、卷芯顶部的隔膜翻折、极片掉粉的问题。
Smart Images
Figure CN224732956U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and more specifically, to a battery and a battery pack. Background Technology
[0002] The top cover of a hard-shell battery typically consists of a top cover plate and a lower plastic cover. The top cover plate has an injection hole for injecting electrolyte into the battery. The lower plastic cover has a through-hole corresponding to the injection hole; that is, the injection hole and the through-hole in the lower plastic cover are vertically connected. This allows the electrolyte to pass sequentially through the injection hole in the top cover, the through-hole in the lower plastic cover, and then into the battery interior when the injection nozzle of the injection device comes into contact with the top cover injection port to inject electrolyte into the battery. This electrolyte then wets the core, providing a pathway for lithium ions to move during charging and discharging.
[0003] However, when injecting electrolyte into the battery, the electrolyte is pressurized to accelerate the injection speed and improve the wetting effect. Because the injection hole and through hole are generally directly opposite the tabs or the top of the core, the high-pressure injected electrolyte has a large impact force, which can impact the tabs, causing them to tear, resulting in increased internal resistance or capacity loss; or impact the top of the core, causing the separator to fold, the positive and negative electrode sheets to shed powder or tear, resulting in capacity loss or internal short circuit and safety accidents. Utility Model Content
[0004] This utility model provides a battery and battery pack that can reduce or avoid the impact of electrolyte on the tabs or core during electrolyte injection, thereby avoiding problems such as tab tearing, diaphragm folding at the top of the core, and electrode powder shedding.
[0005] The embodiments of this utility model can be implemented as follows: An embodiment of this utility model provides a battery comprising: The battery includes a lower housing, a winding core, and a battery top cover, wherein the winding core is housed within the lower housing. The battery top cover includes a cover plate and a plastic component, the cover plate having an injection hole; the plastic component is located between the top surface of the core and the cover plate; The plastic part includes a plastic part body and a boss. The plastic part body is connected to the lower part of the cover plate. The boss is provided on the side of the plastic part body away from the cover plate. The plastic part body has a connecting groove that communicates with the injection hole and is correspondingly arranged with the boss. The boss has an inlet hole that communicates with the connecting groove. The inlet hole communicates with the interior of the lower housing so that the electrolyte can flow into the battery through the injection hole, the connecting groove and the inlet hole in sequence, and wet the winding core. The diameter of the inlet hole at the end closer to the cover plate is smaller than the diameter at the end farther from the cover plate.
[0006] In an optional embodiment, the diameter of the liquid inlet gradually increases from the direction closer to the cover plate to the direction farther away from the cover plate; And / or, the diameter of the injection hole gradually decreases from the direction away from the plastic part body to the direction closer to the plastic part body.
[0007] In an optional embodiment, the sidewall of the boss forming the liquid inlet hole is an arc surface or an inclined plane, and the distance of the sidewall from the center line of the liquid inlet hole gradually increases from the end near the connecting groove to the end away from the connecting groove.
[0008] In an optional implementation, the boss satisfies one of the following conditions: The bottom surface of the boss is an inclined plane, and the bottom surface is an inclined plane that slopes downward relative to the center line of the liquid inlet hole; The bottom surface of the boss is arc-shaped and recessed towards the plastic part body; The bottom surface of the boss is arc-shaped and protrudes away from the direction of the plastic part body.
[0009] In an optional embodiment, there are multiple liquid inlet holes, which are spaced apart on the boss.
[0010] In an optional embodiment, the maximum diameter of the inlet hole is smaller than the minimum diameter of the injection hole.
[0011] In an optional embodiment, the battery further includes a sealing nail disposed at the injection hole for sealing the injection hole; Furthermore, the sealing nail is threadedly connected to the injection hole.
[0012] In an optional embodiment, the cover plate is provided with an electrode post that protrudes from the plastic part; the core is provided with an electrode lug; the height of the electrode post protruding from the plastic part is H0, the height of the electrode lug when bent is H1, and the height of the boss is H2; wherein... .
[0013] In an optional embodiment, the battery further includes a high-temperature resistant adhesive layer, which is attached to the core and disposed opposite to the liquid inlet hole.
[0014] An embodiment of this utility model also provides a battery pack, including a plurality of batteries as described in any of the above embodiments, wherein the plurality of batteries are connected together.
[0015] The beneficial effects of the battery and battery pack according to the embodiments of this utility model include, for example: The battery includes a lower casing, a winding core, and a top cover. The winding core is housed within the lower casing. The top cover includes a cover plate and a plastic component. The cover plate has an injection hole. The plastic component is located between the top surface of the winding core and the cover plate. The plastic component includes a body and a boss. The body is connected to the bottom of the cover plate. The boss protrudes from the side of the body away from the cover plate. The body has a connecting groove that communicates with the injection hole, and the connecting groove corresponds to the boss. The boss has an inlet hole that communicates with the connecting groove. The inlet hole communicates with the interior of the lower casing, allowing the electrolyte to flow sequentially through the injection hole, the connecting groove, and the inlet hole into the battery interior, wetting the winding core. By providing the boss, the sensitive areas of the injection hole and the top of the winding core are physically isolated, preventing the electrolyte from directly impacting the winding core. Instead, the electrolyte is guided to the boss area, providing a buffer zone. Furthermore, the diameter of the inlet hole near the cover plate is smaller than that at the end away from the cover plate. This design allows the electrolyte to diffuse and slow down as it flows from a narrow space to a larger space, thus buffering and slowing down the electrolyte as it passes through the inlet hole. This reduces or avoids the impact of the electrolyte on the tabs or the core, thereby preventing problems such as tab tearing, diaphragm folding at the top of the core, and electrode powder shedding. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the battery provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of a battery cut open from the middle of the terminal post, provided in an embodiment of this utility model. Figure 3 This is an exploded view of the battery top cover provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of a battery top cover cut through the middle of the injection hole, provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of a battery top cover with multiple liquid inlet holes cut through the middle of the liquid injection hole, provided in an embodiment of the present invention. Figure 6 This is a schematic diagram of a battery top cover with multiple liquid inlet holes cut through the middle of the liquid injection hole, provided in an embodiment of the present invention. Figure 7 This is an enlarged cross-sectional view of the liquid inlet location provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of different shaped bosses provided in the embodiments of this utility model.
[0018] Icons: 1000 - Battery; 100 - Battery top cover; 110 - Cover plate; 111 - Liquid injection hole; 120 - Plastic part; 121 - Plastic part body; 1211 - Connecting groove; 122 - Boss; 1221 - Liquid inlet hole; 130 - Sealing nail; 200 - Lower shell; 300 - Core; 310 - Tab; 400 - High temperature resistant adhesive layer. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0022] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.
[0024] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.
[0025] The top cover of a hard-shell battery typically consists of a top cover plate and a lower plastic cover. The top cover plate has an injection hole for injecting electrolyte into the battery. The lower plastic cover has a through-hole corresponding to the injection hole; that is, the injection hole and the through-hole in the lower plastic cover are vertically connected. This allows the electrolyte to pass sequentially through the injection hole in the top cover, the through-hole in the lower plastic cover, and then into the battery interior when the injection nozzle of the injection device comes into contact with the top cover injection port to inject electrolyte into the battery. This allows the electrolyte to wet the core and provide a pathway for lithium ions to move during charging and discharging. However, the electrolyte is pressurized during injection to accelerate the injection speed and improve the wetting effect. Because the electrolyte injection hole and through hole are usually directly opposite the tabs or the top of the core, the high-pressure injected electrolyte has a large impact force, which will impact the tabs, causing them to tear, resulting in increased internal resistance or capacity loss of the battery; or impact the top of the core, causing the separator to fold, the positive and negative electrode sheets to shed powder or tear, resulting in capacity loss of the battery or internal short circuit and safety accidents.
[0026] Based on this, please refer to Figures 1-8 The battery 1000 provided in the embodiments of this utility model can effectively improve the aforementioned technical problems. The battery 1000 can reduce or avoid the impact of the electrolyte on the tabs 310 or the winding core 300 during electrolyte injection, thereby preventing problems such as tearing of the tabs 310, folding of the separator at the top of the winding core 300, and powder shedding from the electrode sheets. The battery 1000 can be applied to battery packs, and battery packs or other electrical devices incorporating the battery 1000 have the same functions as described above, which will not be elaborated further here.
[0027] The battery pack 1000 in this embodiment includes multiple batteries 1000 connected together. The multiple batteries 1000 can be connected in parallel or in series, depending on actual practical needs, and are not limited here.
[0028] The following is a detailed introduction to the 1000 battery.
[0029] Figure 1 This is a schematic diagram of the battery 1000 provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of a battery 1000 cut open from the middle of the terminal post, as provided in an embodiment of the present invention. Figure 3 This is an exploded view of the battery top cover 100 provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the battery top cover 100 cut through the middle of the injection hole 111 in an embodiment of the present invention. Figure 5 This is a schematic diagram of a battery top cover 100 with multiple liquid inlet holes 1221 cut through the middle of the liquid injection hole 111, provided in an embodiment of the present invention. Figure 6 This is a schematic diagram of a battery top cover 100 with multiple liquid inlet holes 1221 cut through the middle of the liquid injection hole 111, provided in an embodiment of the present invention.
[0030] Please see Figures 1-6 In this embodiment, the battery 1000 includes a lower housing 200, a winding core 300, and a battery top cover 100. The winding core 300 is housed within the lower housing 200. The battery top cover 100 includes a cover plate 110 and a plastic component 120. The cover plate 110 has an injection hole 111. The plastic component 120 is located between the top surface of the winding core 300 and the cover plate 110. The plastic component 120 includes a plastic component body 121 and a boss 122. The plastic component body 121 is connected to the lower part of the cover plate 110. The boss 122 protrudes from the side of the plastic component body 121 away from the cover plate 110. A connecting groove 1211 is provided, which communicates with the injection hole 111, and the connecting groove 1211 is correspondingly provided with the boss 122. The boss 122 has an inlet hole 1221, which communicates with the connecting groove 1211. The inlet hole 1221 communicates with the interior of the lower housing 200, so that the electrolyte can flow into the battery 1000 through the injection hole 111, the connecting groove 1211 and the inlet hole 1221 in sequence, and wet the core 300. The diameter of the inlet hole 1221 at the end near the cover plate 110 is smaller than the diameter at the end away from the cover plate 110. By providing the boss 122, the injection hole 111 and the sensitive area on the top of the core 300 are physically isolated, so that the electrolyte coming from the injection hole 111 will not directly impact the core 300, but will be guided to the area of the boss 122 first, giving it a buffer area. Furthermore, by designing the diameter of the inlet hole 1221 at the end near the cover plate 110 to be smaller than that at the end away from the cover plate 110, the electrolyte can diffuse and decelerate when flowing from a narrow space to a larger space. This allows the electrolyte to be buffered and decelerated when passing through the inlet hole 1221, thereby reducing or avoiding the impact of the electrolyte on the tab 310 or the core 300, and thus avoiding problems such as the tab 310 tearing, the diaphragm at the top of the core 300 folding, and the electrode powder falling off.
[0031] The tabs 310 (usually metal foils) are welded to the winding core 300 and connected to the top cover. Direct high-speed impact of electrolyte may cause physical damage to the tabs (such as bending and tearing). Through the buffering of the diameter-variable electrolyte inlet 1221, the electrolyte contacts the tabs 310 at a harmless speed, completely avoiding the risk of tearing. The separator is a very thin plastic microporous membrane. High-speed liquid flow is very likely to blow it up, turn it over or cause it to wrinkle. A folded separator may cause the positive and negative electrodes to come into direct contact, causing an internal short circuit. The buffered electrolyte loses the kinetic energy to "blow" the separator, thereby ensuring the structural integrity of the separator. The active material coating on the electrode sheet is fixed by a binder, but its mechanical strength is limited. The impact of high-speed liquid flow is like washing a wall with a high-pressure water gun, which will cause the active material particles (powder) to fall off. Powder falling will reduce the capacity of the battery 1000, and the fallen powder may also form burrs that pierce the separator. The gentle electrolyte infiltration method is like drizzle moistening the land, which avoids the scouring effect and effectively protects the electrode sheet coating.
[0032] In this embodiment, the electrolyte flow channel is injection hole 111 → communication groove 1211 → electrolyte inlet 1221 → inside the battery 1000. The communication groove 1211 can laterally disperse the concentrated liquid flow, and the electrolyte inlet 1221 can diffuse and decelerate the liquid flow, reducing the kinetic energy of the electrolyte flowing into the battery 1000, forming a graded buffer, which effectively avoids the impact of the electrolyte on the tabs 310 or the winding core 300.
[0033] In order to prevent the boss 122 from affecting the welding of the tabs 310 and the pole post, or prevent the boss 122 from damaging the winding core 300, please continue to refer to Figures 1-5 In this embodiment, a pole post is provided on the cover plate 110, and the pole post protrudes from the plastic part 120; the winding core 300 is provided with the tabs 310; the height of the pole post protruding from the plastic part 120 is H0, the height of the tabs 310 when bent is H1, and the height of the boss 122 is H2; wherein, H0+H1≥H2. When the tab 310 is relatively wide, in the horizontal projection, the tab 310 and the boss 122 have an overlapping portion. If the height of the boss 122 is too high, that is, H0+H1<H2, the boss 122 will lift the tab 310, affecting the welding of the tab 310 and the pole post. If it is a small tab 310, that is, the tab 310 is relatively narrow, and in the horizontal projection, the tab 310 and the boss 122 have no overlapping portion. At this time, the boss 122 will press against the top of the winding core 300, which is likely to damage the positive and negative electrode sheets at the top of the winding core 300, causing powder falling or tearing of the positive and negative electrode sheets.
[0034] In order to achieve a good sealing effect for the battery 1000 after the electrolyte is injected, please refer to Figure 3In this embodiment, the battery 1000 also includes a sealing nail 130, which is disposed at the injection hole 111 for sealing the injection hole 111. Optionally, the sealing nail 130 is threadedly connected to the injection hole 111. A threaded connection allows for a tighter connection between the sealing nail 130 and the cover plate 110, resulting in better sealing. When sealing the injection hole 111 of the battery 1000, the screwdriver on the device can be rotated the same number of turns (i.e., a fixed value) to ensure that the sealing nail 130 enters the same depth in the injection hole 111 of each battery 1000, preventing over-rotation and potential loss of the sealing nail from the injection hole 111 or poor sealing. Alternatively, the sealing nail 130 can be glued to the injection hole 111 or connected by other methods; this is not limited here. The sealing nail 130 can be cylindrical, T-shaped, screw-shaped, or other shapes; this is not limited here.
[0035] To further mitigate the impact of the electrolyte, the battery 1000 in this embodiment also includes a high-temperature resistant adhesive layer 400. The high-temperature resistant adhesive layer 400 is attached to the core 300 and is positioned opposite to the electrolyte inlet 1221. The high-temperature resistant adhesive layer 400 can withstand the impact of the electrolyte on the top of the core 300, further reducing the impact damage to the core 300 during electrolyte injection. The high-temperature resistant adhesive layer 400 is resistant to electrolyte corrosion. The material of the high-temperature resistant adhesive layer 400 can be polyolefins such as PC, PE, and PP. In this embodiment, the thickness of the high-temperature resistant adhesive layer 400 is 0.01mm to 0.2mm. Of course, the high-temperature resistant adhesive layer 400 can also be made of other materials resistant to electrolyte corrosion and high temperatures, which is not limited here. The thickness of the high-temperature resistant adhesive layer 400 is determined by the injected electrolyte flow rate and is not limited here.
[0036] Figure 7 This is an enlarged cross-sectional view of the liquid inlet hole 1221 provided in an embodiment of this utility model. Please refer to... Figure 7 In this embodiment, the diameter of the liquid inlet 1221 gradually increases from the direction near the cover plate 110 to the direction away from the cover plate 110; and / or, the diameter of the liquid injection hole 111 gradually decreases from the direction away from the plastic part body 121 to the direction near the plastic part body 121. The diameter of the liquid inlet 1221 can be set separately from the direction near the cover plate 110 to the direction away from the cover plate 110, or the diameter of the liquid injection hole 111 can be set separately from the direction away from the plastic part body 121 to the direction near the plastic part body 121; of course, both the liquid inlet 1221 and the liquid injection hole 111 can be designed simultaneously as described above.
[0037] Flow velocity refers to the speed at which liquid passes through a pipe or orifice, usually expressed in meters per second (m / s). Flow rate refers to the volume of liquid passing through a pipe or orifice per unit time, usually expressed in liters per second (L / s). The following relationship exists between flow velocity and flow rate: Flow rate = Flow velocity × Orifice area. The size of the orifice directly affects the flow rate of the liquid. When the orifice diameter is small, the flow rate decreases, and the velocity of the liquid flowing through the orifice increases; conversely, when the orifice diameter is large, the flow rate increases, but the velocity of the liquid flowing through the orifice decreases. That is, when fluid flows from a narrow cross-section to a wide cross-section, the flow velocity decreases, while the static pressure increases. The electrolyte enters through the small orifice 1221, with an initial high flow velocity. As it flows into the gradually expanding space below, the cross-sectional area of the flow channel continuously increases, causing the liquid velocity to decrease sharply, and kinetic energy is effectively dissipated. In the initial stage of electrolyte injection, a certain pressure is required to overcome the liquid's gravity, surface tension, and air resistance to "push" the electrolyte into the battery 1000. This tapering injection orifice 111 acts as a nozzle. The liquid flow is accelerated through the tapered injection hole 111, gaining sufficient kinetic energy to ensure a stable, efficient, and leak-free injection process. Then, this accelerated liquid flow immediately enters the diffuser inlet hole 1221 below, where the kinetic energy is instantly dissipated, and the flow rate is reduced to a minimum to minimize the impact on the tab 310 or the top of the core 300.
[0038] Please continue reading. Figure 7 In this embodiment, the boss 122 forms a circular arc surface or an inclined plane as the sidewall of the liquid inlet 1221, and the distance from the end of the sidewall near the connecting groove 1211 to the end away from the connecting groove 1211 from the center line of the liquid inlet 1221 gradually increases. The circular arc surface or inclined plane forms a continuous, gradually expanding flow channel without abrupt changes. When the electrolyte flows into this gradually expanding channel from the smaller aperture above, the fluid velocity will decrease smoothly and continuously along the smooth wall surface, and its kinetic energy will be dissipated evenly, minimizing the flow velocity and reducing fluid impact. The inclined or circular arc sidewall generates an outward guiding force on the liquid flow along the tangential direction of the wall surface. While the liquid flow decelerates, it will be naturally "pushed" away by this force, spreading along the wall surface, thus covering a larger area when flowing out of the liquid inlet 1221. By designing the sidewalls as arc surfaces or inclined planes, a smooth, guided diffusion path is provided, which dissipates the kinetic energy of the electrolyte, transforming it from a high-speed jet into a low-speed, wide, and uniform liquid curtain without damage. This achieves the purpose of protecting the tab 310, diaphragm, and electrode, while also improving the stability of the electrolyte injection process and product quality.
[0039] Please see Figure 7 and combined Figure 5 and Figure 6In this embodiment, there are multiple liquid inlet holes 1221, which are spaced apart on the boss 122. For small-capacity batteries 1000, which require less electrolyte, only one liquid inlet hole 1221 can be provided without affecting the injection efficiency. For large-capacity batteries 1000, which require more electrolyte, multiple liquid inlet holes 1221 can be provided to improve injection efficiency and avoid electrolyte waste and reduced production efficiency caused by overflow (electrolyte overflowing from the nozzle of the injection device) during injection.
[0040] Optionally, in this embodiment, the maximum diameter of the inlet hole 1221 is smaller than the minimum diameter of the injection hole 111. Since the injection hole 111 is larger than the inlet hole 1221, the electrolyte from the injection gun will first quickly fill the chamber containing the injection hole 111 and the connecting groove 1211. Within this chamber, the pressure and flow rate of the liquid will reach a dynamic equilibrium, making it a "pre-pressure chamber" or "buffer chamber." Furthermore, since the maximum diameter of the inlet hole 1221 is smaller than the minimum diameter of the injection hole 111, a buffering and flow-limiting effect can be achieved, ensuring that when the electrolyte flows through the inlet hole 1221 into the interior of the battery 1000, the impact of the electrolyte on the tab 310 or the winding core 300 can be reduced or avoided.
[0041] Figure 8 This is a schematic diagram showing different shapes of bosses 122 provided in embodiments of this utility model. Please refer to... Figure 8 In this embodiment, the boss 122 satisfies one of the following conditions: The bottom surface of the boss 122 is an inclined plane, and the bottom surface is an inclined plane that slopes downward relative to the center line of the liquid inlet hole 1221; The bottom surface of the boss 122 is arc-shaped and recessed towards the plastic body 121; The bottom surface of the boss 122 is arc-shaped and protrudes in a direction away from the plastic part body 121.
[0042] The bottom surface of the boss 122 is designed as an inclined plane, which prevents the electrolyte from dripping vertically downwards. Instead, it provides a "slide" for the electrolyte to flow along the inclined plane to the designated area. Depending on the specific application requirements, the inclination direction of the inclined plane can avoid impact-sensitive locations such as the welding points of the tabs 310, achieving precise delivery. Furthermore, as the electrolyte flows out along the inclined plane, it gains a horizontal velocity component, which helps it spread more quickly in all directions, rather than accumulating at a single point directly below the inlet hole 1221, thus accelerating the wetting process. The bottom surface of the boss 122 is arc-shaped and concave towards the plastic part body 121. The liquid flow spreads along this arc surface into an extremely thin liquid film, eventually dripping or flowing down simultaneously and evenly from the entire edge of the arc surface, further reducing the impact of the electrolytic injection process. The bottom surface of the boss 122 is arc-shaped and protrudes away from the plastic part body 121. This arc-shaped bottom surface forms a small, bowl-shaped "buffer zone" or "pre-aggregation pool", which can further reduce the impact during electrolyte injection and also effectively prevent electrolyte splashing.
[0043] Of course, the bottom surface of the boss 122 can be designed as a flat bottom, a convex bottom, a concave bottom, a sloping bottom, or other shapes, and is not limited here.
[0044] In this embodiment, the boss 122 can be set as circular, square, elliptical or other shapes, and is not limited here.
[0045] In summary, the battery 1000 includes a lower housing 200, a winding core 300, and a battery top cover 100. The winding core 300 is housed within the lower housing 200. The battery top cover 100 includes a cover plate 110 and a plastic component 120. The cover plate 110 has an injection hole 111. The plastic component 120 is located between the top surface of the winding core 300 and the cover plate 110. The plastic component 120 includes a plastic component body 121 and a boss 122. The plastic component body 121 is connected to the lower part of the cover plate 110. The boss 122 protrudes from the side of the plastic component body 121 away from the cover plate 110. The plastic component body 121 has an injection hole 111. A connecting groove 1211 is provided, which communicates with the injection hole 111, and the connecting groove 1211 is correspondingly provided with a boss 122. The boss 122 has an inlet hole 1221, which communicates with the connecting groove 1211. The inlet hole 1221 communicates with the interior of the lower housing 200, so that the electrolyte can flow into the battery 1000 through the injection hole 111, the connecting groove 1211 and the inlet hole 1221 in sequence, and wet the core 300. The diameter of the end of the inlet hole 1221 near the cover plate 110 is smaller than the diameter of the end away from the cover plate 110. By providing the boss 122, the injection hole 111 and the sensitive area on the top of the core 300 are physically isolated, so that the electrolyte coming from the injection hole 111 will not directly impact the core 300, but will be guided to the area of the boss 122 first, giving it a buffer zone. Furthermore, by designing the diameter of the inlet hole 1221 at the end near the cover plate 110 to be smaller than that at the end away from the cover plate 110, the electrolyte can diffuse and decelerate when flowing from a narrow space to a larger space. This allows the electrolyte to be buffered and decelerated when passing through the inlet hole 1221, thereby reducing or avoiding the impact of the electrolyte on the tab 310 or the core 300, and thus avoiding problems such as the tab 310 tearing, the diaphragm at the top of the core 300 folding, and the electrode powder falling off.
[0046] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.
Claims
1. A battery, characterized in that, include: The lower housing (200), the winding core (300), and the battery top cover (100) are provided within the lower housing (200); The battery top cover (100) includes a cover plate (110) and a plastic part (120). The cover plate (110) has an injection hole (111). The plastic part (120) is located between the top surface of the core (300) and the cover plate (110). The plastic part (120) includes a plastic part body (121) and a boss (122). The plastic part body (121) is connected to the lower part of the cover plate (110). The boss (122) protrudes from the side of the plastic part body (121) away from the cover plate (110). The plastic part body (121) has a connecting groove (1211) that communicates with the injection hole (111). The boss (122) is correspondingly provided; the boss (122) has an inlet hole (1221), which is connected to the communicating groove (1211); the inlet hole (1221) is connected to the interior of the lower housing (200) so that the electrolyte can flow into the battery through the injection hole (111), the communicating groove (1211) and the inlet hole (1221) in sequence, and wet the winding core (300). The diameter of the inlet hole (1221) at the end near the cover plate (110) is smaller than the diameter at the end away from the cover plate (110).
2. The battery according to claim 1, characterized in that, The diameter of the liquid inlet (1221) gradually increases from the direction closest to the cover plate (110) to the direction furthest from the cover plate (110); And / or, the diameter of the injection hole (111) gradually decreases from the direction away from the plastic part body (121) to the direction closer to the plastic part body (121).
3. The battery according to claim 2, characterized in that, The maximum diameter of the inlet hole (1221) is smaller than the minimum diameter of the injection hole (111).
4. The battery according to claim 2, characterized in that, The boss (122) forms the sidewall of the liquid inlet (1221) as an arc surface or an inclined plane, and the distance of the sidewall from the center line of the liquid inlet (1221) gradually increases from the end near the connecting groove (1211) to the end away from the connecting groove (1211).
5. The battery according to claim 1, characterized in that, The boss (122) satisfies one of the following conditions: The bottom surface of the boss (122) is an inclined plane, and the bottom surface is an inclined plane that is inclined downward relative to the center line of the liquid inlet (1221); The bottom surface of the boss (122) is arc-shaped and recessed towards the plastic body (121); The bottom surface of the boss (122) is arc-shaped and protrudes in a direction away from the plastic part body (121).
6. The battery according to claim 1, characterized in that, The number of liquid inlet holes (1221) is multiple, and the multiple liquid inlet holes (1221) are spaced apart on the boss (122).
7. The battery according to claim 1, characterized in that, The battery top cover (100) also includes a sealing nail (130), which is disposed at the liquid injection hole (111) and is used to seal the liquid injection hole (111). Furthermore, the sealing nail (130) is threadedly connected to the injection hole (111).
8. The battery according to claim 1, characterized in that, The cover plate (110) is provided with a pole post, which protrudes from the plastic part (120); the core (300) is provided with a tab (310); the height of the pole post protruding from the plastic part (120) is H0, the height of the tab (310) when bent is H1, and the height of the boss (122) is H2; wherein, .
9. The battery according to claim 1, characterized in that, The battery (1000) also includes a high-temperature resistant adhesive layer (400), which is attached to the core (300) and is disposed opposite to the liquid inlet hole (1221).
10. A battery pack, characterized in that, It includes a plurality of batteries (1000) as described in any one of claims 1-9, wherein the plurality of batteries (1000) are connected.