Vehicle lithium iron phosphate battery with shell protection structure

Abstract

The invention discloses a vehicle lithium iron phosphate battery with a shell protection structure, and belongs to the technical field of battery protection, the vehicle lithium iron phosphate battery comprises a protection shell, and driving cavities are formed in the two sides of the protection shell. Through the use of the push-out mechanism, the battery body can be automatically pushed out from the protection shell, workers can conveniently operate the battery body, overhaul of the battery body is achieved, the use effect in the use process is improved, and through the use of the opening and closing mechanism, opening and closing of the protection shell can be controlled; according to the present invention, the external protection on the battery body during the use process is ensured, the safety during the use process is improved, the structure is simple, through the use of the flow control mechanism, the air circulation between the interior and the exterior of the protection shell can be achieved, the internal temperature can be rapidly dissipated, the use effect is ensured, and the influence on the use due to the overhigh temperature of the battery body during the use process is avoided; and the linkage mechanism is connected with the opening and closing mechanism, so that the power source is fully used.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery protection, and specifically relates to a lithium iron phosphate battery for vehicles with a housing protection structure. Background Art

[0002] The lithium iron phosphate battery is a lithium-ion battery that uses lithium iron phosphate (LiFePO4) as the positive electrode material and carbon as the negative electrode material. During the charging process, some lithium ions in the lithium iron phosphate escape, are transferred through the electrolyte to the negative electrode, and are embedded in the negative electrode carbon material. At the same time, electrons are released from the positive electrode and reach the negative electrode through the external circuit to maintain the balance of the chemical reaction. During the discharging process, lithium ions escape from the negative electrode, reach the positive electrode through the electrolyte, and at the same time, the negative electrode releases electrons, which reach the positive electrode through the external circuit to provide energy for the outside world. The lithium iron phosphate battery has the advantages of high working voltage, large energy density, long cycle life, good safety performance, small self-discharge rate, and no memory effect.

[0003] The lithium iron phosphate batteries currently in use are generally directly installed on the machinery that requires the battery. However, if installed on some electric vehicles, the internal structure will be damaged due to long-term jolting. And since a large amount of heat is generated when the lithium iron phosphate battery is in use, corresponding heat dissipation is required. At the same time, the existing battery protection is relatively single, inconvenient for maintenance, making the battery relatively bulky. Summary of the Invention

[0004] The purpose of the present invention is as follows: Through the use of the pushing mechanism, the battery body can be automatically pushed out of the protective housing, facilitating the operation of the staff on the battery body, realizing the maintenance of the battery body, etc., and improving the use effect during the use process. Through the use of the opening and closing mechanism, the opening and closing of the protective housing can be controlled, ensuring the external protection of the battery body during the use process and improving the safety during the use process. And the structure is simple and easy to use. Through the use of the current control mechanism, the air can circulate between the inside and outside of the protective housing, realizing the rapid dissipation of the internal temperature, ensuring the use effect, avoiding the temperature of the battery body being too high during the use process and affecting the use. And through the connection of the linkage mechanism and the opening and closing mechanism, the full use of the power source is realized.

[0005] The technical solution adopted by the present invention is as follows: A lithium iron phosphate battery for vehicles with a housing protection structure, comprising:

[0006] A protective housing, drive cavities are respectively opened on both sides of the protective housing, and a current control cavity is opened on the top of the protective housing;

[0007] The ejection mechanism is provided at the bottom inside the protective housing. The ejection mechanism includes two ejection cylinders and an ejection bottom plate. The two ejection cylinders are respectively fixedly connected to both sides of the bottom inside the protective housing. The ejection bottom plate is slidably connected to the bottom inside the protective housing, and the ejection bottom plate is fixedly connected to the output ends of the two ejection cylinders;

[0008] The battery body is installed on the top of the ejection bottom plate;

[0009] The opening and closing mechanism is provided inside the protective housing for controlling the opening and closing of the protective housing. The opening and closing mechanism includes two groups of opening and closing control components and a sealing plate. Each group of opening and closing control components is provided in each driving cavity. The sealing plate is provided at one side edge inside the protective housing, and both ends of the bottom of one side of the outer surface of the sealing plate are respectively provided on the two groups of opening and closing control components; and

[0010] The flow control mechanism is provided in the flow control cavity for controlling the air flow inside the protective housing. The flow control mechanism includes a flow-through component and a flow control fan rod. The flow control fan rod is rotatably connected to one side inside the flow control cavity. A flow control motor is fixedly connected inside one of the driving cavities, and the output end of the flow control motor is fixedly connected to one end of the flow control fan rod; and

[0011] The linkage mechanism is provided in one of the driving cavities. The linkage mechanism is connected to the flow control mechanism and is connected to one group of opening and closing control components.

[0012] Among them, each group of opening and closing control components includes a rotation control component, a synchronization component, and an opening and closing bent rod. The rotation control component is provided in the driving cavity. The opening and closing bent rod is rotatably connected in the driving cavity, and the opening and closing bent rod is connected to the rotation control group. Rotation arc grooves are respectively opened on both sides of the inner wall of the driving cavity. Both ends of one end of the opening and closing bent rod are respectively slidably connected in the two rotation arc grooves, and the other end of the opening and closing bent rod is fixedly connected to the sealing plate. The synchronization component is provided in the flow control cavity and is connected to the rotation control component.

[0013] Among them, the rotation control component is an opening and closing driving rod. One end of the opening and closing driving rod is rotatably connected to the top inside the driving cavity, and an opening and closing driven gear is fixedly connected to one end of the opening and closing driving rod. A connection groove is opened at one end of the opening and closing bent rod, and the other end of the opening and closing driving rod is rotatably connected in the connection groove.

[0014] Among them, the synchronization component includes an opening and closing driving gear and a connecting rod. The connecting rod is rotatably connected in the flow control cavity. The opening and closing driving gear is fixedly connected to one end of the connecting rod, and the opening and closing driving gear meshes with the opening and closing driven gear.

[0015] Among them, the flow component includes two flow holes, an air inlet hole and an air outlet hole. The two flow holes are respectively opened on one side of the inner wall of the two driving chambers. The air outlet hole is opened on one side of the flow control chamber, and the air inlet hole is opened on one side of the inner wall of the protective housing.

[0016] Among them, the linkage mechanism includes:

[0017] A position control component, arranged at the top on one side of the driving chamber;

[0018] A clamping component, arranged on the position control component, and the clamping component is connected to the flow control fan rod;

[0019] A linkage driving component, arranged on the clamping component for power transmission; and

[0020] A linkage transmission component, arranged on the linkage driving component, and the linkage transmission component is connected to the connecting rod.

[0021] Among them, the position control component includes a rotating seat and a position control cylinder. The rotating seat is rotatably connected to one side of the top of the driving chamber, and the position control cylinder is fixedly connected to the rotating seat.

[0022] Among them, the clamping component includes a clamping tooth rod and a clamping groove. The clamping tooth rod is fixedly connected to the output end of the position control cylinder, and the clamping groove is opened at one end of the flow control fan rod.

[0023] Among them, the linkage driving component includes a linkage driving gear and a clamping through hole. The linkage driving gear is arranged in the driving chamber. The clamping through hole is opened on the linkage driving gear, and the clamping through hole is movably sleeved on the clamping tooth rod.

[0024] Among them, the linkage transmission component includes a linkage tooth belt and a linkage driven gear. The linkage driven gear is fixedly connected to one end of the connecting rod. The two ends of the linkage tooth belt are respectively sleeved on the linkage driving gear and the linkage driven gear, and both ends of the linkage tooth belt are meshed with the linkage driving gear and the linkage driven gear.

[0025] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are:

[0026] (1) In the present invention, through the use of the pushing mechanism, the battery body can be automatically pushed out of the protective housing, which is convenient for the staff to operate on the battery body, realizes the maintenance of the battery body, etc., and improves the use effect during use.

[0027] (2) In the present invention, through the use of the opening and closing mechanism, the opening and closing of the protective housing can be controlled, which ensures the external protection of the battery body during use, improves the safety during use, and has a simple structure and is easy to use.

[0028] (3) In the present invention, by using the flow control mechanism, the air can circulate between the inside and the outside of the protective housing, enabling the rapid dissipation of the internal temperature, ensuring the use effect, and preventing the temperature of the battery body from being too high during use, which may affect the use. Moreover, by connecting the linkage mechanism with the opening and closing mechanism, the full use of the power source is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a partial cross-sectional view of the present invention;

[0030] Figure 2 is a cross-sectional view of the present invention;

[0031] Figure 3 is a partial perspective view of the present invention;

[0032] Figure 4 is a first perspective perspective view of the present invention;

[0033] Figure 5 is a second perspective perspective view of the present invention;

[0034] Figure 6 is a perspective view of the opening and closing mechanism of the present invention;

[0035] Figure 7 is an exploded view of the first perspective linkage mechanism of the present invention;

[0036] Figure 8 is an exploded view of the second perspective linkage mechanism of the present invention.

[0037] Reference numerals in the drawings: 1, protective housing; 2, sealing plate; 3, through-flow hole; 4, pushing bottom plate; 5, pushing cylinder; 6, driving cavity; 7, rotating arc groove; 8, opening and closing driving gear; 9, linkage toothed belt; 10, linkage driving gear; 11, clamping toothed rod; 12, air inlet hole; 13, flow control cavity; 14, connecting rod; 15, rotating seat; 16, opening and closing bent rod; 17, connecting groove; 18, opening and closing driving rod; 19, opening and closing driven gear; 20, flow control fan rod; 21, flow control motor; 22, clamping groove; 23, position control cylinder; 24, clamping through-hole; 25, linkage driven gear; 26, air outlet hole; 27, battery body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] Embodiment 1, referring to Figure 1-8 : A lithium iron phosphate battery for vehicles with a housing protection structure, comprising:

[0040] A protective housing 1, with drive chambers 6 opened on both sides of the protective housing 1, and a flow control chamber 13 opened on the top of the protective housing 1;

[0041] A pushing mechanism, disposed at the inner bottom of the protective housing 1, the pushing mechanism includes two pushing cylinders 5 and a pushing bottom plate 4, the two pushing cylinders 5 are respectively fixedly connected to both sides of the inner bottom of the protective housing 1, the pushing bottom plate 4 is slidably connected to the inner bottom of the protective housing 1, and the pushing bottom plate 4 is fixedly connected to the output ends of the two pushing cylinders 5;

[0042] A battery body 27, the battery body 27 is installed on the top of the pushing bottom plate 4;

[0043] An opening and closing mechanism, disposed inside the protective housing 1, for controlling the opening and closing of the protective housing 1, the opening and closing mechanism includes two groups of opening and closing control components and a sealing plate 2, each group of opening and closing control components is disposed inside each drive chamber 6, the sealing plate 2 is disposed at one side edge inside the protective housing 1, and both ends of the bottom of one side of the outer surface of the sealing plate 2 are respectively disposed on the two groups of opening and closing control components; and

[0044] A flow control mechanism, disposed inside the flow control chamber 13, for controlling the air flow inside the protective housing 1, the flow control mechanism includes a flow component and a flow control fan rod 20, the flow control fan rod 20 is rotatably connected to one side inside the flow control chamber 13, a flow control motor 21 is fixedly connected inside one of the drive chambers 6, and the output end of the flow control motor 21 is fixedly connected to one end of the flow control fan rod 20; and

[0045] A linkage mechanism, disposed inside one of the drive chambers 6, the linkage mechanism is connected to the flow control mechanism, and the linkage mechanism is connected to one group of opening and closing control components.

[0046] In this embodiment: The protective housing 1 wraps the battery body 27 in all directions, avoiding direct extrusion of the battery body 27 by the external environment and affecting the overall use safety. The position of the pushing bottom plate 4 relative to the inside of the protective housing 1 is controlled by two pushing cylinders 5, so that the battery body 27 on it moves inside and outside the protective housing 1, facilitating the use of the staff. The sealing plate 2 controls the opening and closing of the protective housing 1 to ensure the use effect. The flow control motor 21 controls the rotation of the flow control fan rod 20 to evacuate the air flow inside the protective housing 1 to complete cooling. The models of the two pushing cylinders 5 and the flow control motor 21 can be selected from those available on the market according to needs, and will not be elaborated here.

[0047] Specifically, each set of opening and closing control components includes a rotation control assembly, a synchronization assembly, and an opening and closing bent rod 16. The rotation control assembly is arranged in the driving cavity 6. The opening and closing bent rod 16 is rotatably connected in the driving cavity 6 and is connected to the rotation control group. Rotation arc grooves 7 are formed on both sides of the inner wall of the driving cavity 6. Both ends of one end of the opening and closing bent rod 16 are slidably connected in the two rotation arc grooves 7 respectively, and the other end of the opening and closing bent rod 16 is fixedly connected to the sealing plate 2. The synchronization assembly is arranged in the flow control cavity 13 and is connected to the rotation control assembly.

[0048] In this embodiment: The shape of the rotation arc groove 7 is divided into two ends, so that the movement of the opening and closing bent rod 16 is divided into two segments, realizing the movement of the sealing plate 2 in the protective housing 1 and the rotation relative to the protective housing 1.

[0049] Specifically, the rotation control assembly is an opening and closing driving rod 18. One end of the opening and closing driving rod 18 is rotatably connected to the top inside the driving cavity 6, and an opening and closing driven gear 19 is fixedly connected to one end of the opening and closing driving rod 18. A connecting groove 17 is formed at one end of the opening and closing bent rod 16, and the other end of the opening and closing driving rod 18 is rotatably connected in the connecting groove 17.

[0050] In this embodiment: The opening and closing driving rod 18 rotates to control the rotation of the opening and closing bent rod 16 to complete the movement of the sealing plate 2.

[0051] Specifically, the synchronization assembly includes an opening and closing driving gear 8 and a connecting rod 14. The connecting rod 14 is rotatably connected in the flow control cavity 13. The opening and closing driving gear 8 is fixedly connected to one end of the connecting rod 14, and the opening and closing driving gear 8 meshes with the opening and closing driven gear 19.

[0052] In this embodiment: The opening and closing driving gear 8 and the connecting rod 14 cooperate with each other, and the two sets of opening and closing control components are used synchronously through the connecting rod 14.

[0053] Specifically, the flow components include two through-flow holes 3, an air inlet hole 12, and an air outlet hole 26. The two through-flow holes 3 are respectively formed on one side of the inner walls of the two driving cavities 6. The air outlet hole 26 is formed on one side inside the flow control cavity 13. The air inlet hole 12 is formed on one side of the inner wall of the protective housing 1.

[0054] In this embodiment: The two through-flow holes 3, the air inlet hole 12, and the air outlet hole 26 cooperate with each other to connect the inside and the outside of the protective housing 1 and, moreover, to flow unidirectionally.

[0055] Specifically, the linkage mechanism includes:

[0056] A position control component arranged at the top on one side inside the driving cavity 6;

[0057] A clamping component arranged on the position control component and connected to the flow control fan rod 20;

[0058] A linkage drive component is provided on the clamping component for power transmission; and

[0059] A linkage transmission component is provided on the linkage drive component, and the linkage transmission component is connected to the connecting rod 14.

[0060] In this embodiment: The position control component adjusts the clamping component, connects it to the linkage drive component, and outputs power through the linkage transmission component.

[0061] Specifically, the position control component includes a rotating seat 15 and a position control cylinder 23. The rotating seat 15 is rotatably connected to one side of the top of the drive cavity 6, and the position control cylinder 23 is fixedly connected to the rotating seat 15.

[0062] In this embodiment: The model of the position control cylinder 23 can be selected from those available on the market according to needs, and will not be elaborated here. The telescopic position of the position control cylinder 23 is adjusted.

[0063] Specifically, the clamping component includes a clamping tooth rod 11 and a clamping groove 22. The clamping tooth rod 11 is fixedly connected to the output end of the position control cylinder 23, and the clamping groove 22 is opened at one end of the flow control fan rod 20.

[0064] In this embodiment: The clamping tooth rod 11 and the clamping groove 22 are docked with each other, so that when the flow control fan rod 20 rotates, power is transmitted to the linkage drive component.

[0065] Specifically, the linkage drive component includes a linkage drive gear 10 and a clamping through hole 24. The linkage drive gear 10 is arranged in the drive cavity 6, the clamping through hole 24 is opened on the linkage drive gear 10, and the clamping through hole 24 is movably sleeved on the clamping tooth rod 11.

[0066] In this embodiment: The linkage drive gear 10 is installed on the clamping tooth rod 11 through the clamping through hole 24 to complete the docking.

[0067] Specifically, the linkage transmission component includes a linkage belt 9 and a linkage driven gear 25. The linkage driven gear 25 is fixedly connected to one end of the connecting rod 14. The two ends of the linkage belt 9 are respectively sleeved on the linkage drive gear 10 and the linkage driven gear 25, and both ends of the linkage belt 9 are meshed with the linkage drive gear 10 and the linkage driven gear 25.

[0068] In this embodiment: The linkage belt 9 and the linkage driven gear 25 cooperate with each other to transmit the power of the linkage drive gear 10 to the connecting rod 14 for use.

[0069] During use, the flow control motor 21 controls the flow control fan rod 20 to rotate, controls the airflow in the protective shell 1 to be extracted, and discharges the high-temperature airflow in the protective shell 1, thereby ensuring the cooling of the battery body 27 and improving the use effect. When the battery body 27 needs to be repaired, the sealing plate 2 is opened, and the pushing cylinder 5 is extended to make the pushing bottom plate 4 drive the battery body 27 to be moved out, and the use is completed. When the sealing plate 2 is opened, the control cylinder 23 is extended to make the engaging gear rod 11 dock with the engaging groove 22. The flow control motor 21 drives the engaging gear rod 11 and the linkage drive gear 10 to rotate through the flow control fan rod 20. The linkage drive gear 10 transmits power to the linkage driven gear 25 through the linkage toothed belt 9, so that the connecting rod 14 rotates. The connecting rod 14 drives the opening and closing drive gears 8 at both ends to rotate synchronously, and transmits power to the opening and closing driven gear 19, so that the opening and closing drive rod 18 rotates, and the opening and closing bent rod 16 is controlled to rotate in the driving cavity 6 to complete the opening and closing control of the sealing plate 2.

[0070] The control method of the present invention is to control by manually starting and closing the switch. The wiring diagram of the power element and the power supply are common knowledge in the field, and the present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and wiring layout in detail.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vehicle lithium iron phosphate battery with a shell protection structure, characterized in that: include: A protective shell (1), wherein both sides of the protective shell (1) are provided with a driving cavity (6), and a flow control cavity (13) is provided at the top of the protective shell (1); The ejection mechanism is arranged at the bottom of the protective shell (1), and comprises two ejection cylinders (5) and an ejection bottom plate (4). The two ejection cylinders (5) are respectively fixedly connected to two sides of the bottom of the protective shell (1), the ejection bottom plate (4) is slidably connected to the bottom of the protective shell (1), and the ejection bottom plate (4) is fixedly connected to the output ends of the two ejection cylinders (5); A battery body (27), wherein the battery body (27) is installed on the top of the ejection bottom plate (4); an opening and closing mechanism, arranged in the protective housing (1) and used for controlling the opening and closing of the protective housing (1), the opening and closing mechanism comprising two groups of opening and closing control components and a sealing plate (2), each group of the opening and closing control components being arranged in each driving cavity (6), the sealing plate (2) being arranged at an edge of one side of the protective housing (1), and both ends of the bottom of one side of the outer surface of the sealing plate (2) being arranged on the two groups of opening and closing control components respectively; and A flow control mechanism is arranged in the flow control chamber (13) and is used to control the airflow in the protective housing (1). The flow control mechanism comprises a flow component and a flow control fan rod (20). The flow control fan rod (20) is rotatably connected to one side of the flow control chamber (13). A flow control motor (21) is fixedly connected to one of the drive chambers (6). The output end of the flow control motor (21) is fixedly connected to one end of the flow control fan rod (20). as well as The linkage mechanism is arranged in one of the drive chambers (6), the linkage mechanism is connected to the flow control mechanism, and the linkage mechanism is connected to one of the opening and closing control components.

2. A vehicle lithium iron phosphate battery with a shell protection structure as claimed in claim 1, characterized in that: Each group of the opening and closing control components comprises a rotation control component, a synchronization component and an opening and closing curved rod (16); the rotation control component is arranged in the driving chamber (6); the opening and closing curved rod (16) is rotationally connected in the driving chamber (6), and the opening and closing curved rod (16) is connected to the rotation control group; rotation arc grooves (7) are provided on both sides of the inner wall of the driving chamber (6); one end of the opening and closing curved rod (16) is slidably connected to the two rotation arc grooves (7) on both sides, and the other end of the opening and closing curved rod (16) is fixedly connected to the sealing plate (2); the synchronization component is arranged in the flow control chamber (13), and the synchronization component is connected to the rotation control component.

3. A vehicle lithium iron phosphate battery with a shell protection structure as claimed in claim 1, characterized in that: The rotation control component is an opening and closing driving rod (18), one end of the opening and closing driving rod (18) is rotatably connected to the top of the driving chamber (6), and one end of the opening and closing driving rod (18) is fixedly connected to an opening and closing driven gear (19), one end of the opening and closing bending rod (16) is provided with a connecting groove (17), and the other end of the opening and closing driving rod (18) is rotatably connected to the connecting groove (17).

4. A vehicle lithium iron phosphate battery with a shell protection structure as claimed in claim 1, characterized in that: The synchronization component comprises an opening and closing driving gear (8) and a connecting rod (14), wherein the connecting rod (14) is rotatably connected to the flow control chamber (13), the opening and closing driving gear (8) is fixedly connected to one end of the connecting rod (14), and the opening and closing driving gear (8) and the opening and closing driven gear (19) are meshed with each other.

5. A vehicle lithium iron phosphate battery with a shell protection structure as claimed in claim 1, characterized in that: The flow component comprises two flow holes (3), an air inlet hole (12) and an air outlet hole (26); the two flow holes (3) are respectively opened on one side of the inner wall of the two driving chambers (6); the air outlet hole (26) is opened on one side of the flow control chamber (13); and the air inlet hole (12) is opened on one side of the inner wall of the protective shell (1).

6. A vehicle lithium iron phosphate battery with a shell protection structure as claimed in claim 1, characterized in that: The linkage mechanism comprises: A position control component is arranged at the top of one side of the driving chamber (6); A clamping component is arranged on the position control component, and the clamping component is connected to the flow control fan rod (20); A linkage driving component, provided on the clamping component, for transmitting power; and The linkage transmission component is arranged on the linkage driving component, and the linkage transmission component is connected to the connecting rod (14).

7. A vehicle lithium iron phosphate battery with a shell protection structure as claimed in claim 1, characterized in that: The position control component comprises a rotating seat (15) and a position control cylinder (23); the rotating seat (15) is rotatably connected to one side of the top of the driving chamber (6); and the position control cylinder (23) is fixedly connected to the rotating seat (15).

8. The vehicle lithium iron phosphate battery with a shell protection structure as claimed in claim 1, characterized in that: The clamping component comprises a clamping gear rod (11) and a clamping groove (22), wherein the clamping gear rod (11) is fixedly connected to the output end of the position control cylinder (23), and the clamping groove (22) is provided at one end of the flow control fan rod (20).

9. A vehicle lithium iron phosphate battery with a shell protection structure as claimed in claim 1, characterized in that: The linkage drive component comprises a linkage drive gear (10) and a snap-on through hole (24); the linkage drive gear (10) is arranged in a drive cavity (6); the snap-on through hole (24) is formed on the linkage drive gear (10); and the snap-on through hole (24) is movably sleeved on the snap-on gear rod (11).

10. The vehicle lithium iron phosphate battery with a shell protection structure as claimed in claim 1, characterized in that: The linkage transmission component comprises a linkage toothed belt (9) and a linkage driven gear (25), wherein the linkage driven gear (25) is fixedly connected to one end of the connecting rod (14), and the two ends of the linkage toothed belt (9) are respectively sleeved on the linkage driving gear (10) and the linkage driven gear (25), and the two ends of the linkage toothed belt (9) are meshed with the linkage driving gear (10) and the linkage driven gear (25).

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