Pole, terminal assembly and battery

Abstract

The present application provides a pole, a terminal assembly and a battery, the pole comprising: a base having a first surface; the column body is arranged on the first surface and provided with a second surface deviating from the base, and a heat conduction groove is formed in the second surface and filled with a heat conduction material. The heat conduction groove is formed in the second surface, deviating from the base, of the post body of the post, and the heat conduction groove is filled with the heat conduction material, so that heat dissipation of the post can be accelerated, heat accumulation of the post is avoided, and the risk of thermal runaway of the battery is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of battery heat dissipation, and in particular to a pole, a terminal assembly and a battery. Background Art

[0002] In the related art, in order to save costs, the structural design of the battery pole leads to a reduction in the pole's flow area, which in turn leads to an increase in the pole's flow temperature rise, which in turn causes the pole's center temperature to rise, and then causes a more serious accumulation of heat in the battery. At this time, if the heat is not dissipated in time, it may cause thermal runaway of the battery. Summary of the invention

[0003] The embodiments of the present application provide a pole, a terminal assembly, and a battery, which can improve the technical problem of battery thermal runaway caused by increased temperature rise of the pole due to overcurrent in the related art.

[0004] In a first aspect, an embodiment of the present application provides a pole, comprising:

[0005] A base having a first surface;

[0006] The column is arranged on the first surface and has a second surface away from the base. The second surface is provided with a heat conduction groove filled with a heat conduction material.

[0007] The present application provides a heat conduction groove on the second surface of the pole body away from the base and fills the heat conduction groove with heat conductive material, which helps to accelerate the heat dissipation of the pole and avoid the problem of heat accumulation in the pole due to increased temperature rise due to overcurrent, thereby reducing the risk of thermal runaway of the battery due to heat accumulation in the pole.

[0008] In one embodiment, the column includes a first column portion and a second column portion which are connected to each other along the axial direction thereof, and the end of the second column portion away from the first column portion is connected to the base; along the axial direction of the column, the height of the first column portion is H1, and the depth of the heat conduction groove is H2, satisfying 0.09mm≤H2≤0.9H1.

[0009] The present application makes the column include a first column portion and a second column portion which are interconnected along the axial direction thereof, so that when the pole is connected to the terminal pressing block, the first column portion and the second column portion can be respectively inserted into the through holes on the terminal pressing block from both sides of the terminal pressing block and welded together, which helps to more conveniently achieve the connection between the pole and the terminal pressing block; and by making the height H1 of the first column portion and the depth H2 of the heat conduction groove satisfy 0.09mm≤H2≤0.9H1, it helps to save the pole material (save cost) while ensuring the current-carrying performance of the pole.

[0010] In one embodiment, the first column portion and the second column portion are integrally formed; or, the second column portion and the base are integrally formed.

[0011] The present application defines the column as an integrated structure, and then welding it with the base helps to more conveniently achieve the connection between the pole and the terminal block. When the second column part is integrally formed with the base, the second column part extends from the first surface of the base. The integral formation with the base increases the heat conduction area of ​​the battery, improves the battery's current capacity, and thus improves the battery safety. At the same time, the integral formation of the second column part with the base also saves processing costs.

[0012] In one embodiment, the column and the base are integrally formed.

[0013] The present application forms the column and the base in one piece, which can reduce the processing steps and save processing costs, and can avoid the reduction of heat conduction area due to the gap between the negative electrode column and the electrode ear, thereby helping to improve the problem of heat accumulation in the battery.

[0014] In one embodiment, the heat-conducting material includes a phase-change material, which is filled in the heat-conducting groove. The pole also includes a seal, which seals the notch of the heat-conducting groove.

[0015] The present application, by setting the heat-conducting material as a phase-change material, facilitates heat exchange by means of material phase change, and by using a seal to seal the notch of the heat-conducting groove, the problem of phase-change material escaping due to changing into a gas phase can be avoided.

[0016] In one embodiment, the seal completely covers the second surface.

[0017] The present application enables the seal to completely cover the second surface of the column, which is more conducive to heat dissipation of the column and improves the heat accumulation in the battery.

[0018] In one embodiment, the sealing member includes an aluminum sheet, a plastic sheet, a potting compound, and / or the thickness of the sealing member is 0.05 mm to 0.5 mm.

[0019] The present application can use aluminum sheets, plastic sheets, potting glue, etc. as sealants, making the setting of the sealants easier to achieve; and by setting the thickness of the sealants between 0.05mm and 0.5mm, it helps to save materials while ensuring the sealing effect.

[0020] In one embodiment, the heat conducting groove and the column are coaxially arranged.

[0021] The present application helps to ensure the structural strength of the pole by arranging the heat conduction groove coaxially with the column, avoiding problems such as the heat conduction groove wall being easily collapsed due to the eccentric arrangement and the pole edge and the terminal block being difficult to weld.

[0022] In one embodiment, the groove of the heat conducting groove is chamfered.

[0023] The present application chamfers the slot of the heat-conducting slot to increase the size of the slot of the heat-conducting slot, which is helpful for filling the heat-conducting material into the heat-conducting slot.

[0024] In one embodiment, in a direction perpendicular to the central axis of the heat conducting groove, the cross section of the heat conducting groove is circular or elliptical.

[0025] The present application sets the cross section of the heat-conducting groove along the direction perpendicular to its central axis to be circular or elliptical, which helps to reduce the flow resistance of the heat-conducting material when filling the heat-conducting material, so that the heat-conducting material fills the heat-conducting groove as much as possible, thereby helping to ensure the heat dissipation effect.

[0026] In one embodiment, the angle between the groove wall of the heat-conducting groove and the central axis of the heat-conducting groove is θ, which satisfies: 0°≤θ≤60°.

[0027] In one embodiment, along the depth direction of the heat conducting groove, the radial dimension of the heat conducting groove gradually decreases.

[0028] The present application helps to reduce the difficulty of filling the heat-conducting groove to the bottom of the heat-conducting groove by gradually reducing the radial dimension of the heat-conducting groove along its depth direction, so that the heat-conducting material fills the heat-conducting groove as much as possible, thereby ensuring the heat dissipation effect.

[0029] In one embodiment, the thermally conductive material includes potting compound or thermally conductive gel.

[0030] In a second aspect, an embodiment of the present application provides a terminal assembly, comprising: the above-mentioned pole; a terminal pressing block, which is provided with a through hole, and the end of the column away from the base is inserted into the through hole and connected to the terminal pressing block.

[0031] In one embodiment, the terminal pressing block has a third surface facing away from the base, and a sink is arranged around the through hole on the third surface, the surface of the sink is flush with the second surface, and the seal of the pole is arranged on the second surface and the surface of the sink; the third surface is flush with the surface of the seal away from the column.

[0032] The present application facilitates the installation of the seal by making the table surface of the sink flush with the second surface; and helps to ensure the flatness of the terminal assembly on the third surface side by making the third surface flush with the surface of the seal away from the column.

[0033] In a third aspect, an embodiment of the present application provides a battery, comprising the above-mentioned terminal assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 is a schematic diagram of the structure of a pole provided in an embodiment of the present application;

[0036] Figure 2 is a schematic structural diagram of a column provided in some embodiments of the present application;

[0037] Figure 3 is a schematic structural diagram of another column provided in some embodiments of the present application;

[0038] Figure 4 is a schematic diagram of the structure of another pole provided in some embodiments of the present application;

[0039] Figure 5 is a schematic diagram of the structure of another pole provided in some embodiments of the present application;

[0040] Figure 6 is a structural schematic diagram of a column provided in some embodiments of the present application;

[0041] Figure 7 is a schematic diagram of the structure of a heat conduction groove provided in some embodiments of the present application;

[0042] Figure 8 is a cross-sectional view of a column provided in some embodiments of the present application;

[0043] Fig. 9 is a cross-sectional view of another column provided in some embodiments of the present application;

[0044] Fig.10 is a cross-sectional view of another column provided in some embodiments of the present application;

[0045] Fig.11 is a schematic diagram of a thermally conductive material filling area provided in an embodiment of the present application;

[0046] Fig.12 It is a structural schematic diagram of a terminal assembly provided in an embodiment of the present application.

[0047] Reference numerals:

[0048] 1-base, 2-column, 3-heat-conducting groove, 4-heat-conducting material, 5-seal, 6-terminal pressing block, 11-first surface, 21-first column part, 22-second column part, 23-second surface, 61-third surface, 62-sinking platform. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0050] With the advancement of fast charging technology, the heat accumulation in the battery has become more and more serious. If the heat is not dissipated in time, it may cause thermal runaway of the battery. In the related art, for the negative electrode top cover, the pole is divided into an upper pole, a lower pole and a base. The lower pole is made of the same material as the base and is connected together by welding, and the upper pole is connected to the lower pole. In order to ensure the welding strength, a sinking platform design is required on the upper pole. As a result, on the one hand, the processing cost is high, and on the other hand, there is a gap between the negative pole and the pole ear, and the heat conduction area is reduced, which is not conducive to solving the problem of heat accumulation in the battery. In addition, in order to save materials and save costs, the depth and width of the sinking platform of the upper pole are set to be larger, so that a larger pit is formed on the upper pole, resulting in a weakened flow area of ​​the pole and an increase in the flow temperature rise. However, due to the low heat transfer coefficient of the air domain, the temperature at the center of the pole increases. This is also not conducive to solving the problem of heat accumulation in the battery.

[0051] Please refer to Figure 1 , Figure 1 The present invention provides a pole according to an embodiment of the present invention, comprising: a base 1 having a first surface 11; a column 2 disposed on the first surface 11, the column 2 having a second surface 23 facing away from the base 1, the second surface 23 having a heat conduction groove 3, and the heat conduction groove 3 is filled with a heat conduction material 4.

[0052] In the embodiment of the present application, the heat-conducting groove 3 opened on the second surface 23 of the column 2 of the pole is filled with a heat-conducting material 4, which increases the heat-conducting area of ​​the pole, helps to accelerate the heat dissipation of the pole, and avoids the problem of heat accumulation in the pole due to increased temperature rise due to overcurrent, thereby reducing the risk of thermal runaway of the battery due to heat accumulation in the pole.

[0053] Please refer to Figure 2 , Figure 2Schematic diagram of the structure of a column provided in some embodiments of the present application (unit in the figure: mm). In some embodiments of the present application, the column 2 includes a first column portion 21 and a second column portion 22 connected to each other along its axial direction, and the end of the second column portion 22 away from the first column portion 21 is connected to the base 1; along the axial direction of the column 2, the height of the first column portion 21 is H1, and the depth of the heat conduction groove 3 is H2, satisfying 0.09mm≤H2≤0.9H1.

[0054] In this embodiment, the column 2 includes a first column part 21 and a second column part 22 connected to each other along its axial direction, so that when the pole is connected to the terminal pressing block 6, the first column part 21 and the second column part 22 can be respectively inserted into the through holes on the terminal pressing block 6 from both sides of the terminal pressing block 6 and welded together, which helps to more conveniently realize the connection between the pole and the terminal pressing block 6; the heat conduction groove 3 is opened on the first column part 21, so the depth H2 of the heat conduction groove 3 is closely related to the height H1 of the first column part 21. When designing the heat conduction groove 3, not only the influence of the depth H2 of the heat conduction groove 3 on the heat dissipation effect should be considered, but also the influence of the depth H2 of the heat conduction groove 3 on the first column part 21 should be considered. In this embodiment, the depth H2 of the heat conduction groove 3 and the height H1 of the first column part 21 must satisfy 0.09mm≤H2≤0.9H1. When the depth H2 of the heat conduction groove 3 is within this range, both the current performance of the pole and the structural strength of the first column part 21 can be guaranteed.

[0055] Please refer to Figure 3 and Figure 4 , Figure 3 is a schematic diagram of the structure of another column provided in an embodiment of the present application (unit in the figure: mm), Figure 4 1 is a schematic diagram of another pole structure provided in some embodiments of the present application (unit: mm). In some embodiments of the present application, the first column portion 21 and the second column portion 22 are integrally formed; or, the second column portion 22 and the base 1 are integrally formed.

[0056] In some embodiments of the present application, the column 2 is an integral structure, and the column 2 is welded to the base 1. At this time, the column 2 can be inserted into the through hole on the terminal block 6 from the side of the terminal block 6 away from the base 1, and then welded to the base 1 to facilitate the connection between the pole and the terminal block 6. When the second column portion 22 is integrally formed with the base 1, the second column portion 22 extends from the first surface 11 of the base 1 and is integrally formed with the base 1, which increases the thermal conductivity area of ​​the battery, improves the current capacity of the battery, and thus improves the safety of the battery. At the same time, the second column portion 22 is integrally formed with the base 1, which also saves processing costs.

[0057] Please refer to Figure 5 , Figure 5It is a schematic diagram of the structure of another pole provided by the embodiments of the present application. In some embodiments of the present application, the pole 2 and the base 1 are integrally formed.

[0058] In the embodiment of the present application, the column 2 is integrally formed with the base 1. At this time, the pole and the terminal block 6 can be connected by riveting. Moreover, compared with the poles separately arranged in the related art, the processing steps can be reduced, the processing cost can be saved, and the reduction of the heat conduction area caused by the gap between the negative pole and the pole ear can be avoided, thereby helping to improve the problem of heat accumulation in the battery.

[0059] Please refer to Figure 6 , Figure 6 1 is a schematic diagram of a structure of a column provided in some embodiments of the present application. In some embodiments of the present application, the thermal conductive material 4 includes a phase change material, the phase change material is filled in the thermal conductive groove 3, and the pole further includes a seal 5, the seal 5 seals the notch of the thermal conductive groove 3.

[0060] In this embodiment, the heat-conducting material 4 is a phase-change material. Since the physical state of the phase-change material changes when the temperature reaches the phase-change temperature, in order to prevent the new product after the physical state of the phase-change material changes from affecting the performance of the battery, a sealing member 5 for sealing the heat-conducting groove 3 is provided at the notch of the heat-conducting groove 3 in the embodiment of the present application (see Figure 6 ), so that the phase change material is in a sealed space. This embodiment not only increases the heat conduction area of ​​the pole, which is beneficial to the heat dissipation of the pole and avoids the safety risks caused by the heat accumulation of the pole, but also avoids the problem of phase change material escaping due to changing to a gas phase.

[0061] In some embodiments of the present application, the sealing member 5 completely covers the second surface 23 .

[0062] refer to Figure 6 The seal 5 in this embodiment completely covers the second surface 23 of the column 2, which is more conducive to the heat dissipation of the column 2 and improves the heat accumulation in the battery.

[0063] In some embodiments of the present application, the seal 5 includes an aluminum sheet, a plastic sheet, and a potting compound, and the thickness of the seal 5 is 0.05 mm to 0.5 mm.

[0064] The seal 5 in this embodiment is used to seal the heat conducting groove 3, and by setting the thickness of the seal 5 between 0.05 mm and 0.5 mm, it is helpful to save materials while ensuring the sealing effect. Obviously, the thickness and material of the seal 5 in the above embodiment are examples and do not constitute a limitation of the present application.

[0065] In some embodiments of the present application, the heat conducting groove 3 and the column 2 are coaxially arranged.

[0066] In this embodiment, the heat-conducting groove 3 is coaxial with the column 2, so that the heat-conducting groove 3 is located in the middle of the column 2, thereby avoiding the situation where different parts of the column 2 have different heat dissipation effects, making full use of the heat-conducting material 4 to dissipate heat from the pole, and avoiding the safety risks caused by heat accumulation in the pole. At the same time, it also helps to ensure the structural strength of the pole, avoiding problems such as the wall of the heat-conducting groove 3 being easily collapsed due to the eccentric setting and the edge of the pole being difficult to weld with the terminal block 6.

[0067] Please refer to Figure 7 , Figure 7 It is a schematic diagram of the structure of a heat-conducting groove provided in some embodiments of the present application. In some embodiments of the present application, the groove of the heat-conducting groove 3 is chamfered.

[0068] In the embodiment of the present application, the slot opening of the heat conducting slot 3 is chamfered to increase the size of the slot opening of the heat conducting slot 3 , which helps to fill the heat conducting material 4 into the heat conducting slot 3 .

[0069] Please refer to Figure 8 and Fig. 9 , Figure 8 is a cross-sectional view of a column provided in some embodiments of the present application, Fig. 9 It is a cross-sectional view of another column provided in some embodiments of the present application. In some embodiments of the present application, in a direction perpendicular to the central axis of the heat conducting groove 3, the cross section of the heat conducting groove 3 is circular or elliptical.

[0070] The main purpose of opening the heat-conducting groove 3 on the column 2 of the pole is to enhance the heat dissipation effect of the pole and avoid the safety risks caused by the heat accumulation of the pole. Therefore, in this embodiment, the cross-sectional shape of the heat-conducting groove 3 is designed to be circular or elliptical. Compared with other cross-sectional shapes, the heat-conducting groove 3 corresponding to the cross-sectional shape in this embodiment can accommodate more heat-conducting materials 4, while also reducing the flow resistance of the heat-conducting materials 4. Therefore, the heat dissipation effect of the pole is also better, effectively avoiding the safety risks caused by the heat accumulation of the pole, and solving the technical problem that the heat accumulation in the battery is serious and may cause thermal runaway of the battery.

[0071] In some embodiments of the present application, the angle between the groove wall of the heat-conducting groove 3 and the central axis of the heat-conducting groove 3 is θ, which satisfies: 0°≤θ≤60°.

[0072] In this embodiment, the angle between the groove wall of the heat-conducting groove 3 and the central axis of the heat-conducting groove 3 is selected within the range of 0° to 60° (including 0° and 60°), so that the heat-conducting material 4 can completely fill the heat-conducting groove 3 without filling dead corners (i.e., spaces that cannot be filled by the heat-conducting material 4), thereby ensuring the heat dissipation effect of the pole and the strength of the column 2 of the pole.

[0073] Please refer to Fig.10 , Fig.10It is a cross-sectional view of another column provided in some embodiments of the present application. In some embodiments of the present application, along the depth direction of the heat conducting groove 3, the radial dimension of the heat conducting groove 3 gradually decreases.

[0074] The present application increases the heat dissipation area of ​​the pole by filling the heat-conducting material 4 in the heat-conducting groove 3. Therefore, when designing the heat-conducting groove 3, the convenience of filling the heat-conducting material 4 and whether the heat-conducting material 4 can completely fill the heat-conducting groove 3 should be considered. In this embodiment, the radial dimension of the heat-conducting groove 3 is gradually reduced along the depth direction of the heat-conducting groove 3, which helps to reduce the difficulty of filling the heat-conducting material 4 to the bottom of the heat-conducting groove 3, facilitates the filling of the heat-conducting material 4, and can ensure that the heat-conducting material 4 can completely fill the heat-conducting groove 3 without filling dead corners (i.e., spaces that cannot be filled by the heat-conducting material 4). The heat-conducting material 4 completely fills the heat-conducting groove 3, increases the heat dissipation area of ​​the pole, avoids the safety risks caused by the heat accumulation of the pole, and solves the technical problem that the heat accumulation in the battery may cause thermal runaway of the battery.

[0075] In some embodiments of the present application, the thermally conductive material 4 includes a potting compound or a thermally conductive gel.

[0076] In this embodiment, the thermal conductive adhesive can be a cured potting adhesive or a thermal conductive gel. Since the physical state of the thermal conductive adhesive is stable and not easy to change, when the thermal conductive material 4 is a thermal conductive adhesive, the thermal conductive adhesive can be directly used to completely fill the thermal conductive groove 3 without sealing the thermal conductive groove 3. Alternatively, the thermal conductive adhesive can be used to completely fill the thermal conductive groove 3 and the space for setting the sealing member 5. Fig.11 Obviously, the specific types of thermally conductive adhesives in the above embodiments are examples and do not constitute a limitation to the present application.

[0077] On the other hand, an embodiment of the present application also provides a terminal assembly, including: the above-mentioned pole; a terminal pressing block 6, which has a through hole, and the end of the column 2 away from the base 1 is inserted into the through hole and connected to the terminal pressing block 6.

[0078] In some embodiments of the present application, the terminal block 6 has a third surface 61 facing away from the base 1, and a sink 62 is arranged around the through hole on the third surface 61. The surface of the sink 62 is flush with the second surface 23, and the seal 5 of the pole is arranged on the second surface 23 and the surface of the sink 62; the third surface 61 is flush with the surface of the seal 5 away from the column 2.

[0079] Please refer to Fig.12 , Fig.12 It is a structural schematic diagram of a terminal assembly provided in an embodiment of the present application. In the embodiment of the present application, by making the table top of the sink 62 flush with the second surface 23, it helps to facilitate the installation of the seal 5; and by making the third surface 61 flush with the surface of the seal 5 away from the column 2, it helps to ensure the flatness of the terminal assembly on the third surface 61 side.

[0080] On the other hand, an embodiment of the present application further provides a battery, comprising the above-mentioned terminal assembly.

[0081] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A pole, characterized in that: include: A base having a first surface; The column is arranged on the first surface, and the column has a second surface away from the base. The second surface is provided with a heat conduction groove, and the heat conduction groove is filled with a heat conduction material.

2. The pole according to claim 1, characterized in that: The column includes a first column portion and a second column portion connected to each other along its axial direction, the second surface is the end surface of the first column portion away from the second column portion, and the end of the second column portion away from the first column portion is connected to the base; along the axial direction of the column, the height of the first column portion is H1, and the depth of the heat conduction groove is H2, satisfying: 0.09mm≤H2≤0.9H1.

3. The pole according to claim 2, characterized in that: The first column portion and the second column portion are integrally formed; or the second column portion and the base are integrally formed.

4. The pole according to claim 1, characterized in that: The column and the base are integrally formed.

5. The pole according to claim 1, characterized in that: The heat-conducting material includes a phase-change material, and the pole further includes a sealing member, which seals the notch of the heat-conducting groove.

6. The pole according to claim 5, characterized in that: The seal completely covers the second surface.

7. The pole according to claim 5, characterized in that: The sealing member is an aluminum sheet, a plastic sheet or a potting adhesive, and / or the thickness of the sealing member is 0.05 mm to 0.5 mm.

8. The pole according to claim 1, characterized in that: The heat conduction groove is coaxially arranged with the column.

9. The pole according to claim 1, characterized in that: The notch of the heat conducting groove is chamfered.

10. The pole according to claim 1, characterized in that: In a direction perpendicular to the central axis of the heat-conducting groove, the cross-section of the heat-conducting groove is circular or elliptical.

11. The pole according to claim 10, characterized in that: The angle between the groove wall of the heat-conducting groove and the central axis of the heat-conducting groove is θ, which satisfies: 0°≤θ≤60°.

12. The pole according to claim 11, characterized in that: Along the depth direction of the heat conducting groove, the radial dimension of the heat conducting groove gradually decreases.

13. The pole according to claim 1, characterized in that: The thermally conductive material includes potting glue or thermally conductive gel.

14. A terminal assembly, characterized in that: include: The pole according to any one of claims 1 to 13; The terminal pressing block is provided with a through hole, and the end of the column away from the base is inserted into the through hole and connected to the terminal pressing block.

15. The terminal assembly according to claim 14, characterized in that The terminal pressing block has a third surface facing away from the base, and a sink is arranged on the third surface around the through hole, the surface of the sink is flush with the second surface of the pole, and the seal of the pole is arranged on the second surface and the surface of the sink; the third surface is flush with the surface of the seal away from the column.

16. A battery, characterized in that: Comprising the terminal assembly as claimed in claim 14 or 15.

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