Battery cover plate and battery

Abstract

This utility model provides a battery cover plate, including terminals, a cover plate body, a first connector, and a first patch. The terminals are stepped, and the welding process is optimized through welding with the first connector and the design of a first recess and positioning protrusion, ensuring precise positioning and improving the reliability of the electrical connection. The first patch covers the first recess to prevent weld slag from falling off. The positioning protrusion design facilitates subsequent installation and current transmission. The battery cover plate also includes a second connector, a sealing element, a first insulating element, and a second insulating element, which respectively realize the functions of current conduction, sealing, electrical insulation, and buffer protection. This utility model also provides a battery including the above-mentioned battery cover plate. Due to the structural design of the battery cover plate, not only is the battery's sealing performance improved and electrical insulation achieved, but weld slag is also prevented from falling off, ensuring the connection effect, improving the electrical connection reliability and current transmission efficiency of the battery, and making the battery perform excellently in terms of performance, safety, and reliability.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery covers and batteries. Background Technology

[0002] In the field of battery technology, the battery cover, as a key component of a battery, undertakes multiple functions, including current transmission, encapsulating the internal structure of the battery, and realizing electrical connections. However, existing battery covers still face many technical challenges in design and practical application.

[0003] In terms of current transfer efficiency, traditional battery covers have unreasonable structural design, resulting in complex current transfer paths, increased resistance, and severe current loss, which cannot meet the high-efficiency current transfer requirements of high-power batteries.

[0004] In the manufacturing process of battery cover plates, the issue of weld slag protection also urgently needs to be addressed. If weld slag falls onto the surface of critical components, it will not only affect the connection effect but may also cause safety hazards such as short circuits. Therefore, how to design a battery cover plate with efficient current transmission capability, stable structural connection, reliable electrical insulation performance, and good weld slag protection effect has become a technical problem that urgently needs to be solved in the current battery technology field. Utility Model Content

[0005] Therefore, it is necessary to address the technical problems caused by the shortcomings of traditional battery covers in terms of current conduction, structural encapsulation, and electrical isolation, which lead to poor battery performance, safety, and reliability. This would improve the battery's performance in terms of current conduction, structural encapsulation, and electrical isolation, thereby enhancing the overall performance, safety, and reliability of the battery.

[0006] The first aspect of this utility model provides a battery cover plate, which includes a terminal post, a cover plate body, a first connector, and a first patch; the terminal post has a first step portion, a second step portion, a third step portion, and a fourth step portion arranged sequentially along a first direction, wherein the cross-sectional area of ​​the second step portion, the third step portion, and the fourth step portion decreases sequentially; the cover plate body is provided with a first through hole for only the third step portion and the fourth step portion to pass through; the first connector is provided with a first welding hole and a second welding hole for the first step portion and the second step portion to be inserted into respectively, and the first step portion is welded to the first welding hole; a first groove expanding outward from the first welding hole is provided on the end face of the first connector away from the cover plate body; a positioning protrusion is provided on the end face of the first step portion away from the cover plate body, and the positioning protrusion extends into the thickness space of the first groove in the first direction; the first patch is embedded in the first groove and is interference-fitted to the outer periphery of the positioning protrusion. This structural design, through the stepped design of the terminals, ensures efficient current conduction while enabling compatible connections with different components, dispersing stress concentration and improving connection reliability. Simultaneously, the welding of the first connector to the terminals, along with the design of the first groove and positioning protrusion, optimizes the welding process window, ensuring precise positioning during assembly and facilitating stable current transmission. Furthermore, the first patch covering the first groove prevents weld slag from falling off, ensuring connection effectiveness and improving the electrical connection reliability of the battery cover.

[0007] In other embodiments, the thickness D of the positioning protrusion along the first direction satisfies: 0.2mm ≤ D ≤ 0.8mm. This design ensures accurate positioning during assembly, allowing the positioning protrusion on the terminal post to directly contact the corresponding conductive component when the first connector is connected to it. This enables direct current transfer from the terminal post, improving current transfer efficiency and further optimizing the electrical performance of the battery cover.

[0008] In other embodiments, the diameter L of the end face of the positioning protrusion away from the first step satisfies: 2mm ≤ L ≤ 10mm, the sidewall of the positioning protrusion is an arc surface or a tapered slope, and the diameter of the end face of the positioning protrusion away from the first step is smaller than the diameter of the end face of the positioning protrusion near the first step. This design facilitates the positioning and installation of the subsequent first patch, and helps to improve the assembly efficiency and stability of the battery cover.

[0009] In other embodiments, the first patch is made of a conductive material, including aluminum or copper. Selecting a suitable material based on the different positive and negative terminals of the battery can meet the requirements for current transmission and match the material of the tabs, which is beneficial for achieving a stable electrical connection and improving the conductivity of the battery cover.

[0010] In other embodiments, in the first direction, the thickness of the first patch is less than or equal to the thickness of the positioning protrusion, and a second through hole corresponding to the shape of the positioning protrusion is provided on the first patch. This design allows the thickness of the first patch to be adjusted according to the protrusion height of the weld, so that the end face of the first patch away from the first step is on the same plane as the end face of the positioning protrusion away from the first step, increasing the contact area with the conductive component, improving the current transmission effect, and further optimizing the electrical performance of the battery cover.

[0011] In other embodiments, the battery cover further includes a second connector, with a third and fourth stepped portion passing through the first through hole and respectively inserted into a fourth and third welding hole on the second connector. The fourth stepped portion is welded to the third welding hole. The second connector is directly welded to the tab, enabling the conduction of electrode current and further improving the current conduction capability of the battery cover.

[0012] In other embodiments, a second recessed groove is provided on the end face of the second connector away from the cover plate body, which expands outward from the third welding hole. A second patch is provided on the end face of the second connector away from the cover plate body, covering the second recessed groove. The main purpose of the second patch is to prevent welding slag in the third welding hole from easily falling between the second connector and the electrode, thus affecting the connection between the two. If the same material as the electrode is used, it can also be welded to the electrode to play a certain role in electrical conduction. If other materials, such as non-conductive materials, are used, it is usually not connected to the electrode here, but only blocks the welding slag, thereby ensuring the electrical connection reliability of the battery cover plate.

[0013] In other embodiments, the battery cover also includes a seal, which is press-fitted into the first through hole and sleeved on the outer periphery of the third step. The seal achieves sealing through radial interference, ensuring sealing reliability while avoiding failure due to excessive compression, thus improving overall sealing performance, preventing electrolyte leakage inside the battery, and preventing electrolyte from corroding and damaging the external environment and other components, thereby ensuring the safe operation of the battery.

[0014] In other embodiments, the battery cover further includes a first insulating member and a second insulating member; the first insulating member includes a bottom and a side portion extending from the outer edge of the bottom in a first direction away from the cover body, a second stepped portion and a first connecting member are disposed within the mounting space enclosed by the side portion and the bottom, and the bottom is provided with a third through hole for the third stepped portion to pass through; the second insulating member is disposed between the cover body and the second connecting member, and the second insulating member is provided with a fourth through hole for the third stepped portion to pass through. The first and second insulating members effectively prevent electrical short circuits between the terminal and the cover body, and between the terminal, the second connecting member and the cover body, ensuring the electrical safety of the battery. At the same time, the second insulating member also plays a certain role in buffering and protection, reducing damage to the internal structure of the battery cover caused by vibration, impact and other factors.

[0015] The second aspect of this utility model provides a battery including the aforementioned battery cover. Due to the numerous advantages and characteristics of the battery cover, the battery incorporating this cover exhibits excellent performance, safety, and reliability. Through the synergistic effect of the components within the battery cover, not only is the battery's sealing improved, but electrical insulation is also achieved, ensuring the battery's safe operation. Simultaneously, the design of the first and second patches in the battery cover effectively prevents solder slag from falling off, ensuring a good connection and improving the electrical connection reliability of the battery. The first patch can also participate in current transmission, further improving the battery's current delivery efficiency, thus enhancing the overall performance of the battery. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the battery cover plate in Embodiment 1 of this application.

[0017] Figure 2 This is a top view of the battery cover in Embodiment 1 of this application.

[0018] Figure 3 for Figure 2 A sectional view along line A.

[0019] Figure 4 for Figure 3 A magnified view of part B in the middle.

[0020] Figure 5 This is a schematic diagram of the structure of the pole post and the second patch in Embodiment 1 of this application.

[0021] Figure 6 for Figure 4 An enlarged schematic diagram of the first connecting component.

[0022] Figure 7 for Figure 4 Enlarged schematic diagram of the second connector.

[0023] Figure label:

[0024] 100, pole post; 200, first insulating component; 300, cover plate body; 400, first connector; 500, first patch; 600, sealing component; 700, second insulating component; 800, second connector; 900, second patch;

[0025] 101. Positioning protrusion; 110. First step; 120. Second step; 130. Third step; 140. Fourth step;

[0026] 201. Side; 202. Bottom;

[0027] 301, First through hole;

[0028] 401. First weld hole; 402. First settling tank; 403. Second weld hole;

[0029] 801, Third welding hole; 802, Second settling tank; 803, Fourth welding hole;

[0030] 501, Second through hole. Detailed Implementation

[0031] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0032] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application.

[0033] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0037] Example 1

[0038] This embodiment discloses a battery cover plate, which serves as a core component of the battery and performs multiple functions such as current conduction, structural encapsulation, and electrical isolation.

[0039] like Figures 1-5As shown, the battery cover mainly includes a terminal post 100, a cover body 300, a first connector 400, and a second connector 800. The terminal post 100 is made of a metal with excellent conductivity (such as aluminum or copper) and includes a first step portion 110, a second step portion 120, a third step portion 130, and a fourth step portion 140 arranged sequentially along a first direction (i.e., axial direction). Each step portion is precision-machined into an integral structure, and the cross-sectional area of ​​the second step portion 120, the third step portion 130, and the fourth step portion 140 decreases sequentially, forming a stepped structure. This design ensures efficient current conduction and enables adaptable connections with different components. The stepped structure disperses stress concentration and improves connection reliability.

[0040] In this embodiment, the second step portion 120, the third step portion 130, the fourth step portion 140, and the first step portion 110 are all cylindrical, and their axes are collinear. This design significantly improves conductivity because the current travels more directly and smoothly through the collinear cylindrical structure, reducing current loss during transmission. The current transmitted through the tab can be rapidly transmitted via the first step portion 110, the fourth step portion 140, the third step portion 130, and the second step portion 120.

[0041] Both the first connector 400 and the second connector 800 are conductive metals. The first connector 400 is used to connect with other conductive components to conduct the current of the pole 100. The second connector 800 is connected to the tab to conduct the current of the pole group.

[0042] The cover plate body 300 serves as the main body of the battery casing, and has a first through hole 301 for the third step portion 130 and the fourth step portion 140 to pass through. During assembly, after the third step portion 130 and the fourth step portion 140 pass through the first through hole 301, they overlap the outer edge of the first through hole 301 through the shoulder surface of the second step portion 120, forming a mechanical limit and realizing the axial positioning of the terminal post 100.

[0043] like Figure 6 As shown, the first connector 400 is a metal conductive component. The material of the first connector 400 can be the same as or different from that of the pole post 100. It is provided with a first welding hole 401 and a second welding hole 403 for the first step portion 110 and the second step portion 120 to be inserted into respectively. During welding, the first step portion 110 and the first welding hole 401 are welded to form an integral structure.

[0044] To optimize the welding process window, a first groove 402 is provided on the end face of the first connector 400 away from the cover plate body 300, which expands outward from the first welding hole 401. The depth of the groove matches the welding penetration depth and can cover the protrusion of the weld, so as to avoid the protrusion affecting the subsequent connection effect of the first connector 400 or pole post 100 with other structures.

[0045] like Figure 4 As shown, further, a positioning protrusion 101 is provided on the end face of the first step portion 110 away from the cover plate body 300. The protrusion extends into the axial space of the first recess 402, and the thickness D of the positioning protrusion 101 satisfies 0.2mm≤D≤0.8mm, and is equal to the thickness of the first recess 402, ensuring accurate positioning during assembly. This allows the positioning protrusion 101 on the pole post 100 to directly contact the corresponding conductive component when the first connector 400 is connected to the corresponding conductive component, thereby realizing direct current transmission from the pole post 100 and improving the current transmission effect.

[0046] In this embodiment, as Figure 4 and Figure 5 As shown, the end face diameter L of the positioning protrusion 101 satisfies 2mm≤L≤10mm. Its side adopts a tapered slope design. The side wall of the positioning protrusion 101 is an arc surface or a tapered slope. The end face diameter of the positioning protrusion 101 away from the first step portion 110 is smaller than the end face diameter of the positioning protrusion 101 close to the first step portion 110. That is, the diameter of the end of the positioning protrusion 101 extending outward is smaller than the end of the positioning protrusion 101 connected to the first step portion 110, which facilitates the subsequent positioning and installation of the first patch 500.

[0047] In this embodiment, as Figure 4 and Figure 5 As shown, a first patch 500 is covered on the end face of the first connector 400 away from the cover body 300. The first patch 500 includes either aluminum or copper. The choice of material for the first patch 500 is related to the positive and negative electrodes of the battery. On the positive electrode side, the tab is generally made of aluminum foil, with aluminum being the preferred material. Similarly, copper is preferred for the negative electrode. This is because aluminum and copper have good electrical conductivity, which can meet the requirements of current transmission, and they match the material of the tab, which is conducive to achieving a stable electrical connection. In addition, the first patch 500 can also be made of other metal materials with good conductivity to meet the needs of different battery designs.

[0048] The first patch 500 is embedded in the first recess 402 and is fitted onto the outer periphery of the positioning protrusion 101 by interference fit, completely covering the first recess 402, and is provided with a second through hole 501 corresponding to the shape of the positioning protrusion 101.

[0049] In this embodiment, the thickness of the first patch 500 is less than or equal to the thickness of the positioning protrusion 101. The thickness depends primarily on the height of the weld protrusion. If the weld protrusion height is very small or even close to zero, the thickness of the first patch 500 is the same as the thickness of the positioning protrusion 101, ensuring that the end face of the first patch 500 away from the first step portion 110 and the end face of the positioning protrusion 101 away from the first step portion 110 are on the same plane, increasing the contact area with the conductive component. However, if the weld has a certain protrusion height, the corresponding thickness needs to be subtracted from the first patch 500 to ensure that the end face of the first patch 500 away from the first step portion 110 and the end face of the positioning protrusion 101 away from the first step portion 110 are on the same plane.

[0050] like Figure 7 As shown, in another embodiment, the battery cover also includes a second connector 800, which is a metal conductive component and is directly welded to the tab. The third step portion 130 and the fourth step portion 140 pass through the first through hole 301 and are respectively inserted into the fourth welding hole 803 and the third welding hole 801 on the second connector 800. The fourth step portion 140 is welded to the third welding hole 801 to form an integral structure. A second recess 802, expanding outward from the third welding hole 801, is provided on the end face of the second connector 800 away from the cover body 300. A second patch 900 is covered on this groove. The material of this patch can be the same as or different from the first patch 500. The main purpose of the second patch 900 is to prevent welding slag in the third welding hole 801 from easily falling between the second connector 800 and the tab, affecting the connection between them. If the same material is used, it can also be welded to the tab to provide a certain degree of conductivity. If other materials, such as non-conductive materials, are used, this part is usually not connected to the tab and only blocks the welding slag.

[0051] To ensure sealing performance, the battery cover also includes a sealing element 600, which is made of a non-conductive material, press-fitted into the first through hole 301 and fitted around the outer periphery of the third step portion 130. The sealing element 600 achieves sealing through radial interference, ensuring sealing reliability while preventing failure due to excessive compression. On one hand, this improves overall sealing performance, preventing electrolyte leakage from inside the battery and avoiding corrosion and damage to the external environment and other components caused by the electrolyte. On the other hand, the sealing element 600, together with the first insulating element 200 and the second insulating element 700, provides isolation and insulation between the cover body 300 and the terminal post 100, preventing electrical faults such as short circuits inside the battery and ensuring safe battery operation.

[0052] In terms of insulation design, the battery cover also includes a first insulating element 200 and a second insulating element 700.

[0053] like Figure 4As shown, this embodiment also includes a first insulating member 200 and a second insulating member 700. The first insulating member 200 includes a bottom 202 and a side portion 201 extending from the outer edge of the bottom 202 in a first direction away from the cover plate body 300. A second stepped portion 120 and a first connecting member 400 are disposed within the mounting space enclosed by the side portion 201 and the bottom 202. The bottom 202 is provided with a third through hole for the third stepped portion 130 to pass through. The first insulating member 200 effectively prevents electrical short circuits between the terminal post 100 and the cover plate body 300, ensuring the electrical safety of the battery.

[0054] like Figure 4 As shown, the second insulating member 700 is disposed between the cover plate body 300 and the second connecting member 800, and the second insulating member 700 is provided with a fourth through hole for the third step portion 130 to pass through. The second insulating member 700 separates the terminal post 100, the second connecting member 800 and the cover plate body 300, further enhancing the electrical insulation performance of the battery cover and preventing electrical short circuits between different components. At the same time, the second insulating member 700 also plays a certain role in buffering and protection, reducing damage to the internal structure of the battery cover caused by vibration, impact and other factors.

[0055] Example 2

[0056] This embodiment discloses a battery that includes the battery cover plate described in detail in Embodiment 1 above. Because the battery cover plate possesses the numerous advantages and characteristics mentioned above, the battery including this cover plate exhibits excellent performance, safety, and reliability.

[0057] The battery employs the aforementioned battery cover plate, enabling it to achieve high efficiency and stability in current transmission. Through the coordinated action of components such as the terminal post 100, cover plate body 300, sealing element 600, first connector 400, second connector 800, first insulator 200, and second insulator 700, not only is the battery's sealing performance improved, but electrical insulation is also achieved, ensuring the battery's safe operation. Furthermore, the design of the first patch 500 and second patch 900 in the battery cover plate effectively prevents weld slag from falling off, ensuring a good connection and improving the reliability of the battery's electrical connection. Simultaneously, the first patch 500 can also participate in current transmission, further improving the battery's current delivery efficiency. This multifunctional structural design makes the battery cover plate play a crucial role in the battery, contributing to the overall performance improvement of the battery.

[0058] In summary, batteries incorporating the aforementioned battery cover exhibit significant advantages in performance, safety, and reliability, meeting the demands of various application scenarios and possessing broad market application prospects. The design and manufacturing process of this battery cover fully considers the various characteristics and usage requirements of the battery. Through rational structural design and material selection, optimizations have been achieved in current transmission, encapsulation protection, and electrical insulation, providing strong support for the high-performance operation of the battery.

[0059] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cover, characterized in that, Includes pole, cover plate body, first connector and first patch; The pole post has a first step portion, a second step portion, a third step portion and a fourth step portion arranged sequentially along a first direction, wherein the cross-sectional area of ​​the second step portion, the third step portion and the fourth step portion decreases sequentially; The cover plate body is provided with a first through hole for the third step and the fourth step to pass through only; The first connector is provided with a first welding hole and a second welding hole (403) for the first step portion and the second step portion (120) to be inserted into respectively, and the first step portion is welded to the first welding hole; The first connector has a first groove on its end face away from the cover plate body in a first direction, which expands outward from the first welding hole. A positioning protrusion is provided on the end face of the first step portion away from the cover plate body, and the positioning protrusion extends into the thickness space of the first sink in the first direction. The first patch is embedded in the first groove (402) and is interference-fitted onto the outer periphery of the positioning protrusion.

2. The battery cover plate of claim 1, wherein, The thickness D of the positioning protrusion along the first direction satisfies: 0.2mm≤D≤0.8mm.

3. The battery cover plate of claim 2, wherein, The diameter L of the end face of the positioning protrusion away from the first step satisfies: 2mm≤L≤10mm. The sidewall of the positioning protrusion is an arc surface or a tapered slope surface, and the diameter of the end face of the positioning protrusion away from the first step is smaller than the diameter of the end face of the positioning protrusion close to the first step.

4. A battery cover according to any one of claims 1-3, characterized in that, The first patch is made of a conductive material, including either aluminum or copper.

5. A battery cover according to claim 4, characterized in that, In the first direction, the thickness of the first patch is less than or equal to the thickness of the positioning protrusion, and a second through hole corresponding to the shape of the positioning protrusion is provided on the first patch.

6. A battery cover according to claim 1, characterized in that, It also includes a second connector, wherein the third step portion and the fourth step portion pass through the first through hole and are respectively inserted into the fourth welding hole (803) and the third welding hole opened on the second connector, and the fourth step portion is welded to the third welding hole (801).

7. A battery cover according to claim 6, characterized in that, The second connector has a second recessed groove on the end face away from the cover plate body that expands outward from the third welding hole, and a second patch covering the second recessed groove is provided on the end face away from the cover plate body.

8. A battery cover according to claim 1, characterized in that, It also includes a sealing element, which is press-fitted into the first through hole and sleeved on the outer periphery of the third step portion.

9. A battery cover according to claim 6 or 7, characterized in that, It also includes a first insulating component and a second insulating component; The first insulating member includes a bottom and a side extending from the outer edge of the bottom in a first direction away from the cover plate body. The second stepped portion and the first connecting member are disposed within the mounting space enclosed by the side and the bottom. The bottom is provided with a third through hole through which the third stepped portion passes. The second insulating member is disposed between the cover plate body and the second connecting member, and the second insulating member is provided with a fourth through hole for the third step portion to pass through.

10. A battery, characterized in that, It includes a battery cover as described in any one of claims 1-9.

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