Battery cover plate and battery

Abstract

The utility model provides a kind of battery cover plate and battery, comprising: cover plate body, with oppositely arranged first side and second side, the second side is set as close to battery compared with the first side, the cover plate body is equipped with liquid injection hole, the liquid injection hole penetrates the first side and second side;Wherein, the caliber of the opening on the second side where the liquid injection hole is located is greater than the caliber of the opening on the first side;The utility model improves the injection difficulty problem in injection process, improves injection efficiency.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery cover and a battery. Background Technology

[0002] In the field of battery technology, as the volumetric energy density of battery cells continues to increase, battery structure design faces many new challenges. In battery structures of the same volume, the volume occupied by the cells shows a continuous increasing trend, leading to a significant increase in group margin. Increased group margin means that the cells inside the battery are arranged more densely, and the space between the cells is significantly compressed.

[0003] Current technologies have revealed numerous problems in addressing this compact battery structure. Due to the limited internal space, electrolyte cannot flow smoothly and evenly into all areas of the battery during injection, often resulting in localized liquid accumulation. This prevents the electrolyte from spreading evenly throughout the battery, affecting not only the consistency of battery performance but also potentially threatening battery safety and lifespan. Utility Model Content

[0004] The embodiments of this utility model provide a battery cover and a battery, which improves the problem of difficult liquid injection in related technologies.

[0005] In a first aspect, embodiments of this application provide a battery cover, comprising: a cover body having a first side and a second side disposed opposite to each other, the second side being positioned closer to the battery cell than the first side, the cover body having an injection hole that penetrates the first side and the second side; wherein the diameter of the opening of the injection hole on the second side is larger than the diameter of the opening on the first side.

[0006] When the electrolyte flows into the battery, it is guided and dispersed, reducing the injection pressure, avoiding localized liquid accumulation, and improving the injection efficiency.

[0007] In some embodiments, the cover plate body includes a cover sheet and a lower plastic pad, the lower plastic pad being connected to the side of the cover sheet near the battery cell; the liquid injection hole penetrates the cover sheet and the lower plastic pad, the first side is the side of the cover sheet facing away from the lower plastic pad, and the second side is the side of the lower plastic pad facing away from the cover sheet.

[0008] The lower plastic pad enhances the insulation performance of the battery cover, preventing short circuits caused by direct contact between the cover and the tabs. At the same time, the electrolyte injection hole runs through both, ensuring smooth electrolyte injection.

[0009] In some embodiments, the cover sheet has a first protrusion extending from the surface of the cover sheet to the side of the lower plastic pad, the first protrusion being disposed around the injection hole; the side of the lower plastic pad facing the cover sheet has a groove corresponding to the protrusion, the protrusion being located in the groove.

[0010] The first protrusion and the groove enhance the connection and seal between the cover and the lower plastic gasket, preventing electrolyte leakage, while also extending the injection path and improving injection efficiency.

[0011] In some embodiments, a second protrusion is provided on the side of the lower plastic pad near the battery cell, and the injection hole passes through the second protrusion.

[0012] The second protrusion further extends the channel length of the injection hole in the direction of the battery cell, allowing the electrolyte to flow and diffuse in a larger space, thus improving the uniformity of the injection.

[0013] In some embodiments, the injection hole includes a first hole segment and a second hole segment, the first hole segment is disposed on the cover plate, the second hole segment is disposed on the lower plastic pad, and the hole diameter is the same at the joint of the first hole segment and the second hole segment.

[0014] By precisely controlling the connection between the two orifices, a smooth transition of the electrolyte at the junction of the cover plate and the lower plastic pad is achieved, reducing injection resistance and improving injection efficiency.

[0015] In some embodiments, both the first hole segment and the second hole segment are conical structures, and the taper of the second hole segment is greater than that of the first hole segment.

[0016] The small taper design of the first hole section ensures the stability of the initial electrolyte injection. Then, the large taper design of the second hole section greatly expands the diffusion space of the electrolyte, allowing it to more fully cover the surface of the battery cell, significantly improving the uniformity of electrolyte injection and the wetting effect of the battery cell.

[0017] In some embodiments, the diameter of the injection hole is set to gradually increase continuously and smoothly along the direction toward the battery cell.

[0018] The electrolyte smoothly changes its flow direction during the flow process, spreading evenly along the direction of pore size change, achieving a more effective guiding and dispersing effect and improving the injection efficiency.

[0019] In some embodiments, the wall of the injection hole is a conical surface.

[0020] The conical hole wall provides a continuous and smooth flow path for the electrolyte, allowing it to spread evenly in all directions, improving dispersion uniformity and avoiding local accumulation.

[0021] In some embodiments, in a cross-section passing through the axis of the injection hole, the semi-cone angle of the injection hole is 30°≤θ≤60°.

[0022] This angle range design allows the electrolyte to obtain sufficient dispersion space during flow while ensuring flow stability and uniform flow to all areas inside the battery.

[0023] In some embodiments, a recessed groove is provided on the first side of the cover plate body, and an injection hole is located at one end of the first side and is disposed within the outline of the recessed groove. The recessed groove is used as an injection pipe interface.

[0024] The sinking tank provides space for the injection pipe interface, making the connection between the injection pipe and the cover plate body more secure and fit, ensuring smooth injection of electrolyte.

[0025] In some embodiments, the cover plate body is provided with an air extraction hole that extends through the first side and the second side.

[0026] The vent hole creates a negative pressure environment during the liquid injection process, which improves the electrolyte wetting effect, reduces injection resistance, and reduces clogging and bubble problems.

[0027] In some embodiments, the diameter of the evacuation port is D1, the minimum diameter of the injection port is D2, and 1 mm ≤ D1 ≤ D2 ≤ mm 3.

[0028] This range balances the injection and evacuation processes, ensuring smooth and uniform electrolyte injection and avoiding problems caused by insufficient or excessive evacuation.

[0029] In some embodiments, a baffle is provided on the second side of the cover plate body, with the two sides of the baffle corresponding to the liquid injection hole and the air extraction hole, respectively.

[0030] The baffle prevents the electrolyte from flowing directly to the vent during the injection process, thus avoiding insufficient injection volume and uneven cell wetting and ensuring injection quality.

[0031] In some embodiments, the two ends of the baffle extend to the two side edges of the cover body, respectively.

[0032] The baffle completely blocks the channel for the electrolyte to flow directly to the extraction area in the horizontal direction, effectively preventing the electrolyte from being drawn out and ensuring that the battery cell is fully wetted.

[0033] In some embodiments, the height of the baffle in the direction perpendicular to the second side is H, where 3mm ≤ H ≤ 7mm; and / or, the thickness of the baffle is L, where 1mm ≤ L ≤ 3mm; and / or, the ratio of the thickness to the height of the baffle, L / H, satisfies 1 ≤ L / H ≤ 7.

[0034] In some embodiments, the cover plate body is provided with a positive electrode mounting hole, a negative electrode mounting hole and an explosion-proof valve mounting hole; the explosion-proof valve mounting hole is located between the positive electrode mounting hole and the negative electrode mounting hole, the liquid injection hole is located between the positive electrode mounting hole and the explosion-proof valve mounting hole, and the air extraction hole is located between the explosion-proof valve mounting hole and the negative electrode mounting hole.

[0035] The positive and negative mounting holes provide installation positions for the positive and negative terminals; the explosion-proof valve mounting hole provides an installation position for the explosion-proof valve.

[0036] Secondly, embodiments of this application provide a battery including the aforementioned battery cover.

[0037] Batteries using the aforementioned battery cover plate show significant improvements in electrolyte injection efficiency, cell wetting uniformity, safety, and reliability.

[0038] The beneficial effects of the embodiments of this utility model are as follows: In an embodiment of this utility model, the battery cover is designed such that the diameter of the opening on the second side is larger than that on the first side. During the injection process, the electrolyte is guided and dispersed as it flows into the battery casing, reducing the injection pressure and avoiding localized liquid accumulation. This alleviates the difficulty of injection to a certain extent.

[0039] On the other hand, the battery cover of this application optimizes the structure of the injection hole, which allows the electrolyte to be injected into the battery more evenly, helping to form a more uniform and better formation interface during the formation process, thereby ensuring the battery's electrical performance. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a perspective view of the battery cover provided in an embodiment of this application; Figure 2 This is a top view of the battery cover provided in an embodiment of this application; Figure 3 This application Figure 2 Schematic diagram of section AA in the diagram; Figure 4 This application Figure 3 A partial schematic diagram at point B; Figure 5 This is a bottom view of the battery cover provided in an embodiment of this application; In the diagram: 100, cover plate body; 110, first side; 120, second side; 130, liquid injection hole; 140, sinking groove; 150, vent hole; 160, baffle; 170, positive electrode mounting hole; 180, negative electrode mounting hole; 190, explosion-proof valve mounting hole; 200, cover plate; 210, lower plastic pad; 220, first protrusion; 230, groove; 240, second protrusion. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0043] In the field of battery technology, as the volumetric energy density of battery cells continues to increase, battery structure design faces many new challenges. In battery structures of the same volume, the volume occupied by the cells shows a continuous increasing trend, leading to a significant increase in group margin. Increased group margin means that the cells inside the battery are arranged more densely, and the space between the cells is significantly compressed.

[0044] Current technologies have revealed numerous problems in addressing this compact battery structure. Due to the limited internal space, electrolyte cannot flow smoothly and evenly into all areas of the battery during injection, often resulting in localized liquid accumulation. This prevents the electrolyte from spreading evenly throughout the battery, affecting not only the consistency of battery performance but also potentially threatening battery safety and lifespan.

[0045] Regarding the above technical issues, firstly, refer to Figure 1 , Figure 2 , Figure 4 This application provides a battery cover, including: a cover body 100, and a positive terminal assembly, a negative terminal assembly, and an explosion-proof valve disposed on the cover body 100.

[0046] The positive and negative terminal assemblies are fixed to the cover plate body 100 through positive mounting holes 170 and negative mounting holes 180, respectively, forming the positive and negative output terminals of the battery and realizing the electrical connection between the battery and the external circuit. The explosion-proof valve is installed in the middle area of ​​the cover plate body through the explosion-proof valve mounting hole 190 to prevent the battery from exploding.

[0047] The cover plate body 100 has a first side 110 and a second side 120 disposed opposite to each other. The second side 120 is positioned closer to the battery cell than the first side 110. The cover plate body 100 is provided with an injection hole 130 that penetrates the first side 110 and the second side 120. The diameter of the opening of the injection hole 130 on the second side 120 is larger than the diameter of the opening on the first side 110.

[0048] Understandably, during the battery electrolyte filling process, the electrolyte is injected from one side of the first side 110 and flows into the battery casing through the filling hole 130. Since the opening diameter of the filling hole 130 on the second side 120 is larger, when the electrolyte flows from the relatively narrow opening of the first side 110 into the wider opening of the second side 120, it's like water flowing from a narrow pipe into a spacious area. The flow state of the electrolyte changes, being guided and dispersed, allowing the electrolyte to flow more evenly into the battery.

[0049] In this embodiment, the battery cover is designed so that the diameter of the opening on the second side 120 is larger than that of the opening on the first side 110. During the injection process, the electrolyte is guided and dispersed when it flows into the battery casing, which reduces the injection pressure and avoids local liquid accumulation. This alleviates the injection difficulty problem in the injection process to a certain extent and improves the injection efficiency.

[0050] On the other hand, the battery cover of this application optimizes the structure of the injection hole 130, enabling the electrolyte to be injected into the battery more evenly, which helps to form a more uniform and better formation interface during the formation process, thereby ensuring the battery's electrical performance.

[0051] In some embodiments, reference Figure 3 , Figure 4 The cover plate body 100 includes a cover plate 200 and a lower plastic pad 210. The lower plastic pad 210 is connected to the side of the cover plate 200 near the battery cell. The liquid injection hole 130 passes through the cover plate 200 and the lower plastic pad 210. The first side is the side of the cover plate 200 away from the lower plastic pad 210, and the second side is the side of the lower plastic pad 210 away from the cover plate 200.

[0052] In this embodiment, the cover plate 200, as the outermost layer of the battery casing, is typically made of rigid metal to provide structural support for the battery and prevent deformation or damage due to external forces. Simultaneously, the cover plate 200 also provides mounting positions for key components such as the positive terminal assembly, negative terminal assembly, and explosion-proof valve. The lower plastic pad 210, typically made of insulating materials such as PP, PE, or PPS, is located between the cover plate and the battery cell. During battery operation, the lower plastic pad 210, with its excellent insulation properties, isolates the cover plate 200 from the positive and negative electrode tabs, preventing short circuits caused by direct contact between the metal cover plate 200 and the electrode tabs.

[0053] In some embodiments, reference Figure 4 The cover plate 200 has a first protrusion 220 extending from the surface of the cover plate 200 to the side of the lower plastic pad, and the first protrusion 220 is arranged around the injection hole 130; the lower plastic pad has a groove 230 corresponding to the first protrusion on the side facing the cover plate 200, and the first protrusion 220 is located in the groove 230.

[0054] Understandably, the injection hole 130 opens towards the battery cell, meaning the lower plastic pad 210 expands away from the cover plate 200. The first protrusion 220 further extends the length of the injection hole 130. When the electrolyte is injected from the cover plate 200 side and passes through the injection hole 130, due to the extended path and expanded space on the battery cell side, the electrolyte has more time and space to disperse during flow, thereby achieving a more effective flow and dispersion effect, alleviating injection difficulties, and improving injection efficiency.

[0055] Furthermore, the first protrusion 220 is in close contact with the lower plastic pad groove 230, which enhances the connection and sealing between the cover 200 and the lower plastic pad 210, preventing electrolyte leakage during the filling process or battery use.

[0056] In some embodiments, reference Figure 4 The lower plastic pad 210 has a second protrusion 240 on the side near the battery cell, and the liquid injection hole 130 passes through the second protrusion 240.

[0057] Understandably, because the injection hole is designed with an opening that widens towards the battery cell and extends through the second protrusion 240, the second protrusion 240 further extends the channel length of the injection hole 130 in the battery cell direction. When electrolyte is injected from the cover plate 200 side and passes through the injection hole 130, the electrolyte flows along the extended path, thereby flowing and diffusing in a larger space, achieving a more thorough guiding and dispersing effect, further alleviating the problems of injection difficulty and local liquid accumulation, and improving injection efficiency.

[0058] In some embodiments, reference Figure 4 The injection hole 130 includes a first hole section and a second hole section. The first hole section is located on the cover plate 200, and the second hole section is located on the lower plastic pad 210. The hole diameter is the same at the joint of the first hole section and the second hole section.

[0059] Understandably, during the electrolyte injection process, the electrolyte is injected from the first side 110 of the cover plate body 100, first entering the first orifice. Since the orifice diameters at the junction of the first and second orifice sections are the same, the electrolyte can smoothly transition to the second orifice section and finally flow into the battery interior near the cell through the second orifice section. By precisely controlling the junction of the two orifice diameters, a smooth transition of the electrolyte at the junction of the cover plate 200 and the lower plastic pad 210 is achieved, reducing injection resistance and improving injection efficiency.

[0060] In some embodiments, reference Figure 4 Both the first and second hole sections are conical structures, and the taper of the second hole section is greater than that of the first hole section.

[0061] Understandably, during the electrolyte injection process, the electrolyte is injected from the first side 110 of the cover plate body 100, initially entering the first orifice section with a smaller taper. As the orifice diameter gradually increases, the electrolyte flow pattern gradually changes. After entering the second orifice section, because the taper of the second orifice section is greater than that of the first orifice section, the electrolyte further diffuses within a larger space, eventually flowing evenly into the area inside the battery near the cell. Through the combination of different tapers, the electrolyte is guided and dispersed stepwise within the injection hole.

[0062] In this embodiment, the small taper design of the first hole section first ensures the stability of the electrolyte during the initial injection. Then, the large taper design of the second hole section greatly expands the diffusion space of the electrolyte, enabling it to more fully cover the surface of the battery cell, significantly improving the uniformity of electrolyte injection and the wetting effect of the battery cell.

[0063] In some embodiments, reference Figure 4 Along the direction toward the battery cell, the diameter of the injection hole 130 is set to gradually increase continuously and smoothly.

[0064] When the electrolyte is injected into the injection hole 130 from one side of the cover plate 200, the flow state changes smoothly as the diameter of the injection hole 130 gradually increases. This allows the electrolyte to diffuse and disperse continuously and evenly in a larger space along the direction of the diameter change, thereby achieving a more effective flow guidance and dispersion effect.

[0065] In some embodiments, reference Figure 4 The wall of injection hole 130 is a conical surface.

[0066] Understandably, since the diameter of the injection hole 130 gradually increases along the direction towards the battery cell, and the hole wall is conical, the conical design provides a continuous and smooth flow path for the electrolyte. This allows the electrolyte to spread evenly in all directions along the conical surface when it flows in, greatly improving the uniformity of electrolyte dispersion and avoiding local accumulation or uneven flow of electrolyte during the injection process.

[0067] Furthermore, the conical surface design reduces the resistance encountered by the electrolyte during flow, allowing it to enter the battery more smoothly through the injection hole 130, reducing the pressure during the injection process and minimizing potential damage to the battery's internal structure due to excessive pressure.

[0068] In some embodiments, reference Figure 4 In a cross-section passing through the axis of injection hole 130, the semi-cone angle of injection hole 130 is 30°≤θ≤60°. The semi-cone angle is the angle between the wall of injection hole 130 and the axis, and for example, it is 30°, 45°, or 60°.

[0069] Understandably, if the angle is too small, the expansion of the injection hole 130 will be insufficient, and the electrolyte will not be sufficiently and effectively dispersed as it passes through, still leading to electrolyte accumulation in localized areas inside the battery and uneven electrolyte injection. On the other hand, if the angle is too large, the electrolyte may become over-dispersed during flow, making its direction difficult to control, and may also increase the risk of electrolyte splashing or leakage.

[0070] Therefore, the design of an angle range of 30° to 60° allows the electrolyte to obtain sufficient dispersion space and ensure relative stability of flow during the flow process, so that it flows evenly to various areas inside the battery in the expected manner.

[0071] In some embodiments, reference Figure 4 The first side 110 of the cover plate body 100 is provided with a sinking groove 140, and the injection hole 130 is located at one end of the first side and is set within the outline of the sinking groove 140. The sinking groove 140 is used as an injection pipe interface.

[0072] Understandably, during the electrolyte injection operation, the interface of the injection pipe is precisely positioned and fixed through the stepped spatial design of the sinking groove 140, with its opening forming a vertically aligned structure with the injection hole 130. After being delivered through the injection pipe, the electrolyte flows directly into the injection hole 130 through the guiding effect of the sinking groove 140, and then enters the battery cell area through the internal channel of the cover plate body 100. The depth design of the sinking groove 140 ensures that the connection between the injection pipe and the cover plate body 100 has sufficient contact area and sealing performance, preventing electrolyte leakage.

[0073] In some embodiments, reference Figure 1 , Figure 2 , Figure 3 The cover plate body 100 is provided with an air extraction hole 150, which penetrates the first side 110 and the second side 120.

[0074] Understandably, during the battery electrolyte injection process, electrolyte is injected into the battery through the injection port 130. Simultaneously, air is evacuated through the evacuation port 150, creating a negative pressure environment inside the battery. Due to this negative pressure, the electrolyte flows along the cover wall, and with the assisted action of evacuation, it circulates within the battery, significantly improving the wetting effect and allowing for more uniform and rapid penetration into every part of the battery. Furthermore, the negative pressure reduces resistance during electrolyte injection, minimizing potential blockages and air bubbles, and improving the speed and stability of the injection process.

[0075] In some embodiments, the diameter of the evacuation port 150 is D1, the minimum diameter of the injection port 130 is D2, and 1 mm ≤ D1 ≤ D2 ≤ 3 mm. For example, D1 can be 1 mm, 2 mm, or 3 mm, and D2 can be 1 mm, 2 mm, or 3 mm.

[0076] Understandably, by setting an appropriate orifice range and making the orifice diameter of the evacuation orifice 150 smaller than that of the injection orifice 130, the process of injection and evacuation can be balanced, ensuring that the electrolyte is injected smoothly and evenly into the battery.

[0077] In some embodiments, reference Figure 3 , Figure 5 The second side 120 of the cover plate body 100 is provided with a baffle 160, and the two sides of the baffle 160 correspond to the liquid injection hole 130 and the air extraction hole 150, respectively.

[0078] Understandably, during the battery electrolyte filling process, electrolyte is injected into the battery through the filling hole 130, while the vent hole 150 performs a venting operation to create negative pressure to assist in the filling process. When the injected electrolyte tends to flow towards the vent hole 150 under the negative pressure, the baffle 160 will act as a barrier to prevent the electrolyte from flowing directly to the vent hole 150, thus avoiding problems such as insufficient electrolyte filling and uneven cell wetting.

[0079] In some embodiments, reference Figure 5 The two ends of the baffle 160 extend to the two side edges of the cover body 100, respectively.

[0080] Understandably, the baffle 160 is designed to extend to the two sides of the cover body 100, forming a full-width barrier structure, further eliminating the risk of the electrolyte being directly drawn away by the vent hole 150 during the injection process. During the injection process, if there is a horizontal flow tendency after the electrolyte is injected from the injection hole 130, the baffle 160 completely blocks the path of the electrolyte directly flowing to the vent hole 150 through its edge covering design. At this time, the electrolyte is forced to preferentially wet the cell area, while the vent hole 150 is only indirectly connected to the injection area through the cell gap, thereby achieving the circulation and wetting of the electrolyte under negative pressure.

[0081] In some embodiments, the height of the baffle 160 in the direction perpendicular to the second side is H, where 3 mm ≤ H ≤ 7 mm; and / or, the thickness of the baffle 160 is L, where 1 mm ≤ L ≤ 3 mm; and / or, the ratio of the thickness to the height of the baffle 160, L / H, satisfies 1 ≤ L / H ≤ 7.

[0082] The height H of the baffle 160 perpendicular to the second side 120 is designed to be 3mm≤H≤7mm, for example, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm. This height range can effectively block the electrolyte from flowing to the vent 150 without interfering with other internal structures of the battery.

[0083] Meanwhile, the thickness L of the baffle 160 is designed to be 1mm≤L≤3mm, such as 1 mm, 2 mm, or 3 mm, which ensures the blocking effect without taking up too much space.

[0084] In addition, the thickness to height ratio L / H of the baffle 160 satisfies 1≤L / H≤7, for example, 1, 4, 6, 7. This ratio design ensures the blocking effect while minimizing the occupation of the battery's internal space, so as to adapt to different models and specifications of battery products.

[0085] In some embodiments, reference Figure 1 , Figure 2 The cover plate body 100 is provided with a positive electrode mounting hole 170, a negative electrode mounting hole 180 and an explosion-proof valve mounting hole 190; the explosion-proof valve mounting hole 190 is located between the positive electrode mounting hole 170 and the negative electrode mounting hole 180, the liquid injection hole 130 is located between the positive electrode mounting hole 170 and the explosion-proof valve mounting hole 190, and the air extraction hole 150 is located between the explosion-proof valve mounting hole 190 and the negative electrode mounting hole 180.

[0086] Understandably, the positive terminal mounting hole 170 and the negative terminal mounting hole 180 provide mounting positions for the positive and negative terminals; the explosion-proof valve mounting hole 190 provides a mounting position for the explosion-proof valve. Furthermore, by separating the liquid injection hole 130 and the venting hole 150, mutual interference between airflow and liquid flow during liquid injection and venting is avoided. Separating the positive and negative terminals reduces the possibility of short circuits between the positive and negative terminals, improving the safety and reliability of battery use. The explosion-proof valve, located in the middle position, can more promptly and accurately detect pressure changes inside the battery, and quickly activate when the pressure reaches a dangerous level to prevent battery explosion.

[0087] Secondly, embodiments of this application provide a battery including the aforementioned battery cover. The battery using the aforementioned battery cover exhibits significant improvements in electrolyte injection efficiency, cell wetting uniformity, safety, and reliability.

[0088] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery cover, characterized in that, include: The cover body (100) has a first side (110) and a second side (120) disposed opposite to each other. The second side (120) is positioned closer to the battery cell than the first side (110). The cover body (100) is provided with an injection hole (130) that penetrates the first side (110) and the second side (120). The diameter of the opening of the injection hole (130) on the second side (120) is larger than the diameter of the opening on the first side (110).

2. The battery cover according to claim 1, characterized in that, The cover plate body (100) includes a cover plate (200) and a lower plastic pad (210), the lower plastic pad (210) being connected to the side of the cover plate (200) near the battery cell; the injection hole (130) penetrates the cover plate (200) and the lower plastic pad (210); the first side (110) is the side of the cover plate (200) facing away from the lower plastic pad (210), and the second side (120) is the side of the lower plastic pad (210) facing away from the cover plate (200).

3. The battery cover according to claim 2, characterized in that, The cover plate (200) is provided with a first protrusion (220) extending from the surface of the cover plate (200) toward the lower plastic pad (210), and the first protrusion (220) is arranged around the injection hole (130); The lower plastic pad (210) has a groove (230) on the side facing the cover plate (200) that corresponds to the first protrusion (220), and the first protrusion (220) is located in the groove (230).

4. The battery cover according to claim 2, characterized in that, The lower plastic pad (210) has a second protrusion (240) on the side near the battery cell, and the liquid injection hole (130) passes through the second protrusion (240).

5. The battery cover according to claim 1, characterized in that, Along the direction toward the battery cell, the diameter of the injection hole (130) is set to gradually increase continuously and smoothly.

6. The battery cover according to claim 5, characterized in that, The wall of the injection hole (130) is a conical surface.

7. The battery cover according to claim 6, characterized in that, In a cross section passing through the axis of the injection hole (130), the semi-cone angle of the injection hole (130) is 30°≤θ≤60°.

8. The battery cover according to claim 1, characterized in that, The first side (110) of the cover plate body (100) is provided with a sinking groove (140), and the injection hole (130) is located at one end of the first side (110) within the outline of the sinking groove (140). The sinking groove (140) is used as an injection pipe interface.

9. The battery cover according to any one of claims 1-8, characterized in that, The cover plate body (100) is provided with an air extraction hole (150), which penetrates the first side (110) and the second side (120).

10. The battery cover according to claim 9, characterized in that, The diameter of the air extraction hole (150) is D1, and the minimum diameter of the liquid injection hole (130) is D2, and 1mm≤D1≤D2≤3mm.

11. The battery cover according to claim 9, characterized in that, The second side (120) of the cover plate body (100) is provided with a baffle (160), and the two sides of the baffle (160) correspond to the injection hole (130) and the air extraction hole (150) respectively.

12. The battery cover according to claim 11, characterized in that, The two ends of the baffle (160) extend to the two side edges of the cover body (100).

13. The battery cover according to claim 11, characterized in that, The height of the baffle (160) in the direction perpendicular to the second side (120) is H, 3mm ≤ H ≤ 7mm; and / or, The thickness of the baffle (160) is L, 1mm ≤ L ≤ 3mm; and / or, The thickness to height ratio L / H of the baffle (160) satisfies 1≤L / H≤7.

14. A battery, characterized in that, Includes the battery cover as described in any one of claims 1-13.

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