Backlight module for battery piece processing and battery light injection furnace

Abstract

The utility model discloses a backlight module for processing a battery piece and a battery light injection furnace, the backlight module comprises a light-emitting assembly, the light-emitting assembly comprises a substrate, the substrate comprises at least one illumination area, and a plurality of lamp beads fixed on the same side of the substrate are arranged on the illumination area. The light reflecting assembly comprises a plate body, the plate body is fixed to the substrate, a light guide hole penetrating through the plate body is formed in the plate body in the thickness direction, the light guide hole corresponds to the lamp beads in position, the light guide hole is of a horn structure, and the light guide hole comprises a first opening, a second opening with the diameter larger than that of the first opening and a light reflecting face between the first opening and the second opening. The second opening is located in the side away from the substrate, the lamp beads are completely embedded in the corresponding light guide holes, and light emitted by the lamp beads is emitted out of the second opening after being reflected by the light reflecting face. Light emitted by the backlight module is concentrated and uniform, light waste is avoided, and energy is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery slice processing equipment, in particular to a backlight module for battery slice processing and a battery light injection furnace. Background Art

[0002] Backlight modules for cell processing are used in many fields according to different needs. In the field of photovoltaic screen printing, high-energy-consuming light source equipment is required when injecting light into solar cells. In the assembly line of solar cell processing, continuous light reinforcement is usually required when injecting light into cells. Existing backlight modules for cell processing usually only have array-distributed lamp beads, which illuminate the cells. However, the light emitted by lamp beads of this structure tends to scatter in all directions, the energy is not concentrated, and the light applied to the cell is small. It is necessary to increase the power of the lamp beads or extend the illumination time, resulting in a large amount of energy waste in cell processing. Utility Model Content

[0003] In order to overcome the above shortcomings, the purpose of the utility model is to provide a backlight module for processing battery cells and a battery light injection furnace, which can make the light more concentrated and uniform, avoid light waste and save energy.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is: a backlight module for processing a battery cell, comprising:

[0005] A light-emitting component, the light-emitting component comprising a substrate, the substrate comprising at least one illumination area, and the illumination area is provided with a plurality of lamp beads fixed on the same side of the substrate;

[0006] A reflective component, wherein the reflective component includes a plate body, the plate body is fixed on a substrate, the plate body is provided with a light guide hole penetrating the plate body along a thickness direction, the light guide hole corresponds to the position of a lamp bead, the light guide hole forms a horn structure, the light guide hole includes a first opening, a second opening having a diameter larger than the first opening, and a reflective surface between the first opening and the second opening, the second opening is located on a side away from the substrate, the lamp bead is completely embedded in the corresponding light guide hole, and the light emitted by the lamp bead is reflected by the reflective surface and then emitted from the second opening.

[0007] The beneficial effect of the utility model is that: a plate body is added, a light guide hole is opened on the plate body, and the horn structure of the light guide hole forms a structure similar to a reflective cup corresponding to a single lamp bead. After the light emitted by the lamp bead is irradiated on the reflective surface, it cannot pass through, but is reflected by the reflective surface, ensuring that the light can only be emitted from the second opening. At this time, the light spot formed by the lamp bead after passing through the light guide hole is more uniform, without scattered light, black spots, and shadows, which can maximize the light utilization rate of the lamp bead and avoid energy waste caused by the scattered light of the lamp bead.

[0008] Furthermore, the cross section of the reflective surface is an inclined surface, and the focus of the inclined surface is arranged on the central axis of the light guide hole. In this case, the light guide hole is a symmetrical structure, and the reflected light is more uniform.

[0009] Furthermore, the light guide holes are not connected to each other, ensuring that the light reflected by one light guide hole will not enter another light guide hole. The second openings of the adjacent light guide holes are closely adjacent, and closely adjacent means that the spacing between the second openings is as small as possible. This ensures that the light spots emitted from the light guide holes are relatively dense, and there are no gaps between the light spots, so as to achieve concentrated energy irradiation of the battery cell.

[0010] Furthermore, the reflective surface has an inclination angle of 40-60° relative to the central axis of the light guide hole. At this time, the distance between the backlight module and the battery cell is 100-150 mm, and the light spot reflected by the light guide hole can be concentrated on the battery cell to illuminate the battery cell.

[0011] Furthermore, in each of the illumination areas, the lamp beads are arranged equidistantly along the first direction to form a light-emitting unit, and multiple unit light-emitting units are arranged equidistantly in the second direction. The multiple lamp beads of each light-emitting unit are arranged alternately with the lamp beads of adjacent light-emitting units in the first direction and the second direction.

[0012] At this time, the lamp beads are arranged in a diamond array. Compared with the lamp beads distributed in a rectangular array, the light spots formed are denser and the energy provided to the battery cell is more concentrated.

[0013] Furthermore, the plate body is an aluminum plate; the lamp beads are one or more of ultraviolet lamps and RGB LED lamps, and the lamp beads are selected according to needs.

[0014] Furthermore, the backlight module also includes an insulating spacer and high-temperature glass.

[0015] The insulating gasket is fixed on the side of the plate body opposite to the base plate, and a light-transmitting hole corresponding to the illumination area is opened on the insulating gasket. The insulating gasket plays the role of sealing the plate body and the high-temperature glass, and also plays the role of insulation.

[0016] The high temperature glass is fixed on the side of the insulating gasket opposite to the plate body, and the high temperature glass is a light-transmitting glass, which is convenient for light to be emitted, and at the same time realizes the encapsulation of the lamp beads to prevent external pollutants from contaminating the lamp beads.

[0017] Furthermore, the substrate further includes connection areas located on both sides of the illumination area in the first direction, no light beads are arranged on the substrate in the connection areas, and the backlight module is fixed by positioning members located in the connection areas to form an integral structure. The fixing members are arranged in the connection areas, so as not to interfere with the light in the illumination area.

[0018] Furthermore, the illumination area is arranged corresponding to the cell that can be moved to its light-emitting side, each illumination area illuminates the corresponding cell, and the orthographic projection of the illumination area on the corresponding cell can cover the entire cell. The illumination area can illuminate all areas of the surface of the corresponding cell.

[0019] Each lighting zone is connected to a controller. Different lighting zones are controlled by different controllers, and the light intensity of each lighting zone can be controlled separately, which increases the flexibility of the backlight module.

[0020] There is a gap between the adjacent battery cells, and the gap corresponds to the connection area. There is no lamp bead above the gap between the battery cells, so no light will illuminate the position without battery cells, which greatly saves energy.

[0021] The utility model also discloses a battery light injection furnace, comprising:

[0022] A housing, wherein the housing defines a processing cavity, and the backlight module is disposed in the processing cavity;

[0023] A transmission device passes through the housing along the second direction, and is used for transmitting the battery slice.

[0024] The battery light injection furnace, because it uses the above-mentioned backlight module, can reflect the light emitted by a single lamp bead through the light guide hole on the board. After the light emitted by the lamp bead hits the reflective surface, it cannot pass through, but is reflected by the reflective surface, ensuring that the light can only be emitted from the second opening. At this time, the light spot formed by the lamp bead after passing through the light guide hole is more uniform, without scattered light, black spots, and shadows, which can maximize the light utilization of the lamp bead and avoid energy waste caused by the scattered light of the lamp bead. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is an exploded view of the backlight module in the embodiment of the utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the light-emitting component in the embodiment of the utility model;

[0027] Figure 3 It is a three-dimensional schematic diagram of a reflective component in an embodiment of the utility model;

[0028] Figure 4 It is a side view of the reflective assembly in the embodiment of the utility model;

[0029] Figure 5 for Figure 4 Section view along line AA.

[0030] In the figure:

[0031] 1. Light-emitting component; 11. Base plate; 111. Illumination area; 112. Lamp beads; 113. Connection area; 2. Reflective component; 21. Plate body; 221. Light guide hole; 2211. First opening; 2212. Second opening; 2213. Reflective surface; 222. Boss; 3. High-temperature glass; 4. Insulating gasket; 41. Light-transmitting hole. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0033] See attached Figure 1 As shown in FIG. 1 , a backlight module for processing a battery cell of the present invention comprises a light emitting component 1 and a light reflecting component 2. Figure 2 As shown, the light emitting assembly 1 includes a substrate 11, the substrate 11 includes at least one illumination area 111, and a plurality of lamp beads 112 fixed on the same side of the substrate 11 are arranged on the illumination area 111. When the lamp beads 112 are powered on, they can light up to illuminate the battery cell. Figure 3 , Attachment Figure 4 and attached Figure 5 As shown, the reflective assembly 2 includes a plate body 21, which is fixed on the substrate 11. The plate body 21 is provided with a light guide hole 221 penetrating the plate body 21 along the thickness direction (Z direction), and the light guide hole 221 corresponds to the position of the lamp bead 112. The light guide hole 221 is a horn structure, including a first opening 2211, a second opening 2212 with a diameter larger than the first opening 2211, and a reflective surface 2213 between the first opening 2211 and the second opening 2212, and the second opening 2212 is located on a side away from the substrate 11. The lamp bead 112 is completely embedded in the corresponding light guide hole 221, and the light emitted by the lamp bead 112 is reflected by the reflective surface 2213 and then emitted from the second opening 2212.

[0034] The lamp bead 112 has a certain light-emitting angle. In one embodiment, the lamp bead is a point light source with a light-emitting angle of 120°.

[0035] In this embodiment, a plate body 21 is added, and a light guide hole 221 is opened on the plate body 21. The horn structure of the light guide hole 221 forms a structure similar to a reflective cup corresponding to a single lamp bead 112. After the light emitted by the lamp bead 112 is irradiated on the reflective surface 2213, it cannot pass through, but is reflected by the reflective surface 2213, ensuring that the light can only be emitted from the second opening 2212. At this time, the light spot formed by the lamp bead 112 after passing through the light guide hole 221 is more uniform, without scattered light, black spots, and shadows, which can maximize the light utilization rate of the lamp bead 112 and avoid energy waste caused by the scattered light of the lamp bead 112.

[0036] In one embodiment, the plate body 21 is an aluminum plate, and the light guide hole 221 is formed on the aluminum plate by machining. The aluminum plate is a material with high reflectivity and poor electrical conductivity. The reflectivity of the aluminum plate can reach more than 85%. The reflective surface 2213 is a smooth surface, forming a mirror structure, and the reflectivity of light can reach more than 90%.

[0037] In this embodiment, the light guide holes 221 are not connected to each other, that is, there is a spacing between the light guide holes 221 to ensure that the light reflected by one light guide hole 221 will not enter another light guide hole 221. However, the second openings 2212 of adjacent light guide holes 221 need to be closely adjacent, and closely adjacent means that the spacing between the second openings 2212 is as small as possible. In this way, it is ensured that the light spots emitted from the light guide holes 221 are relatively dense, and there are no gaps between the light spots, so as to achieve concentrated energy irradiation of the battery cell.

[0038] In one embodiment, see the attached Figure 5 As shown, the cross section of the reflective surface 2213 is an inclined plane, and the focus of the inclined plane is located on the central axis of the light guide hole 221. The lamp bead 112 is placed in a straight state in the light guide hole 221, and the optical axis of the lamp bead 112 coincides with the central axis of the corresponding light guide hole 221. The light of the lamp bead 112 is straight, and all the light emitted by it is reflected once by the reflective surface, that is, it is emitted outside the light guide hole 221, or it is directly not reflected by the reflective surface, and then it is emitted outside the reflective cup. At this time, after the light set by the lamp bead 112 is reflected by the light guide hole 221, the uniformity of the light spot formed is better.

[0039] In one embodiment, the cross section of the reflective surface 2213 may also be a parabolic structure.

[0040] In one embodiment, the plate body 21 is a plastic part, and the reflective surface is coated to form an aluminum film.

[0041] In one embodiment, the lamp bead 112 can pass through the first opening 2211, which requires that the diameter of the first opening 2211 is not less than the size of the lamp bead 112. The shape of the lamp bead 112 is not limited, and can be round or square.

[0042] In one embodiment, see the attached Figure 5 As shown, the inclination angle of the reflective surface 2213 is 40-60°, that is, the angle α between the reflective surface 2213 and the central axis of the light guide hole 221 is 40-60°. At this time, the distance between the backlight module and the battery cell is 100-150mm, and the light spot reflected by the light guide hole 221 can be concentrated on the battery cell to illuminate the battery cell.

[0043] In one embodiment, the reflective assembly 2 includes a plate body 21, which is fixed on the substrate 11. The plate body 21 is provided with through holes corresponding to the lamp beads 112. A plurality of reflective cups protruding from the plate body 21 are fixed on a side of the plate body 21 away from the substrate 11. The reflective cup is a horn structure with openings at both ends. The opening with a smaller diameter of the reflective cup is fixed to the plate body 21. The reflective cup includes an annular wall between the two openings. Each annular wall is arranged around the periphery of each through hole to enclose a receiving cavity, and the lamp beads 112 are placed in the receiving cavity.

[0044] At this time, the reflective cup and the substrate 11 are separate structures, that is, they are not directly processed by the through hole, and can also play the role of focusing light. However, compared with directly using the light guide hole 221 as a reflective cup, it takes up a larger space.

[0045] In one embodiment, see the attached Figure 2 As shown, in each illumination area, the lamp beads 112 are arranged equidistantly along the first direction (X direction) to form a light-emitting unit, and multiple light-emitting units are arranged equidistantly in the second direction (Y direction), and the multiple lamp beads 112 of each light-emitting unit are arranged alternately with the lamp beads 112 of adjacent light-emitting units in the first direction and the second direction.

[0046] See attached Figure 2 As shown, at this time, the lamp beads 112 form a diamond array arrangement. The lamp beads 112 with the same order in all odd-numbered rows of light-emitting units are located on the same vertical line in the Y direction, and the lamp beads 112 with the same order in all even-numbered rows of light-emitting units are located on the same vertical line in the Y direction, while the lamp beads 112 with the same order in two adjacent rows of light-emitting units are not on the same vertical line in the Y direction, thereby forming a structure in which the lamp beads 112 in each row of light-emitting units are staggered with the lamp beads 112 in the adjacent rows of light-emitting units.

[0047] In this embodiment, the special distribution structure of the lamp beads 112 forms a denser light spot than the lamp beads 112 distributed in a rectangular array, and the energy provided to the battery cell is more concentrated.

[0048] In one embodiment, the lamp bead 112 can be one or more of an ultraviolet lamp and an RGB LED lamp. The lamp bead 112 is selected according to needs.

[0049] In one embodiment, see the attached Figure 1As shown, the backlight module also includes high temperature glass 3 and insulating gasket 4. The insulating gasket 4 is fixed on the side of the plate body 21 opposite to the substrate 11. The insulating gasket 4 is provided with a light-transmitting hole 41 corresponding to the illumination area 111. The light of all lamp beads 112 in one illumination area 111 passes through a light-transmitting hole 41. The high temperature glass 3 is fixed on the side of the insulating gasket 4 opposite to the plate body 21. The high temperature glass 3 is a light-transmitting glass, which is convenient for light emission and realizes the encapsulation of the lamp beads 112 to prevent external pollutants from contaminating the lamp beads 112. The insulating gasket 4 plays the role of sealing the plate body 21 and the high temperature glass 3, and also plays an insulating role. The insulating gasket 4 is a polytetrafluoro gasket.

[0050] In one embodiment, the backlight module further includes a cooling component (not shown in the figure), which is used to cool the light-emitting component 1. The cooling component is fixed to the side of the substrate 11 away from the lamp beads 112, and the cooling component is attached to the substrate 11 to remove the heat generated by the light-emitting component 1 when emitting light.

[0051] The cooling assembly includes a heat sink and a heat exchanger. The heat sink is attached to the substrate 11 to increase the heat dissipation area of ​​the substrate 11. The heat exchanger is used to dissipate heat from the heat sink and perform heat exchange with the heat sink. The heat exchanger adopts one of air cooling and water cooling. The heat exchanger includes a shell fixed on the heat sink. The shell defines a heat exchange cavity. A heat exchange medium flows in the heat exchange cavity. The heat exchange medium exchanges heat with the heat sink during the flow process to achieve cooling of the heat sink and the substrate 11. The cooling medium can be a coolant or cooling air.

[0052] In one embodiment, the illumination area 111 is arranged corresponding to the battery cell, and each illumination area 111 illuminates the corresponding battery cell. Because the transmission device may transmit multiple battery cells to the bottom of the LED backlight module at the same time, multiple illumination areas 111 are also arranged to illuminate the battery cells respectively. As shown in the attached figure, the LED backlight module is provided with four illumination areas 111, that is, it can illuminate four battery cells.

[0053] The plurality of cells are arranged at intervals in the first direction, and the illumination areas 111 are also arranged at intervals in the first direction. The orthographic projection of the illumination area 111 on the corresponding cell can cover the entire cell. At this time, the area of ​​the illumination area 111 is larger than the area of ​​the cell, and the illumination area 111 can illuminate all areas of the surface of the corresponding cell.

[0054] See attached Figure 2As shown, the substrate 11 also includes connection areas 113 located on both sides of the illumination area 111 in the first direction. The substrate 11, the plate body 21, the insulating gasket 4 and the high-temperature glass 3 are fixed by positioning members located in the connection area 113, that is, the positioning members are arranged in the connection area 113, and the backlight module is connected and fixed by the positioning members to form a whole. In this embodiment, the fixing members are arranged in the connection area 113, which will not interfere with the light of the illumination area 111.

[0055] The connection area 113 is not provided with light beads, and the intervals between the cells correspond to the connection area 113, that is, the connection area 113 is located directly above the intervals, so that there are no light beads 112 above the intervals between the cells, and no light will illuminate the position without cells, which greatly saves energy. At this time, there is no need to set light guide holes 221 on the plate body 21 of the connection area 113.

[0056] In one embodiment, the fixing member is a bolt or a rivet, and the connection area 113 is provided with a fixing hole corresponding to the fixing member.

[0057] The arrangement of the connection area 113 avoids the arrangement of the lamp beads 112 in areas where light intensity is not required, compared to the situation where the lamp beads 112 are distributed in an entire array, thereby saving costs and energy.

[0058] In one embodiment, the substrate 11 can be formed by splicing multiple substrates 11 bodies, or can be an integral structure of the substrate 11. Similarly, the plate body 21, the insulating gasket 4 and the high temperature glass 3 can also be an integral structure or a spliced ​​piece, which can be flexibly selected according to the actual size and processing requirements.

[0059] In one embodiment, each illumination area 111 is connected to a controller, and the controller is used to control the power of all lamp beads 112 in the corresponding illumination area 111. At this time, different illumination areas 111 are controlled by uncontrolled controllers, and the illumination intensity of each illumination area 111 can be controlled separately, which increases the flexibility of the backlight module.

[0060] In one embodiment, see the attached Figure 3 As shown, a boss 222 protruding from the plate body 21 is provided on one side of the plate body 21 close to the lamp bead 112 in an area corresponding to the connection area 113, and the boss 222 is used to connect the substrate 11 and the plate body 21. The position of the boss 222 will not affect the operation of the lamp bead 112 and improves the connection stability.

[0061] In one embodiment, a battery light injection furnace of the utility model includes a shell, which defines a processing cavity, and the processing cavity is provided with the above-mentioned backlight module. The backlight module irradiates the battery cell in the processing cavity, and the battery cell is located on the light-emitting side of the backlight module.

[0062] The battery light injection furnace also includes a transmission device, which passes through the shell along the second direction. The transmission device is used to transmit the battery cells to transport the battery cells to be processed into the processing chamber and take the processed battery cells out of the processing chamber.

[0063] In one embodiment, the transmission device can transmit multiple cells in the second direction, and the transmission device includes carriers spaced apart along the second direction, and each carrier carries one cell. The carrier corresponds to the illumination area 111, that is, the carrier can drive the cell carried thereon to move to the corresponding illumination area 111 for processing.

[0064] The transmission device is one of roller transmission, chain transmission or mesh belt transmission, that is, the specific structure of the transmission device is not limited as long as it can transmit the battery cells.

[0065] The battery light injection furnace in this embodiment, because the above-mentioned backlight module is used, can reflect the light emitted by a single lamp bead 112 through the light guide hole 221 on the plate body 21. After the light emitted by the lamp bead 112 is irradiated on the reflective surface 2213, it cannot pass through, but is reflected by the reflective surface 2213, ensuring that the light can only be emitted from the second opening 2212. At this time, the light spot formed by the lamp bead 112 after passing through the light guide hole 221 is more uniform, without scattered light, black spots, and shadows, which can maximize the light utilization of the lamp bead 112 and avoid the energy waste caused by the scattered light of the lamp bead 112. At the same time, due to the special distribution structure of the diamond-shaped array of the lamp bead 112, the light spot formed is denser than that of the lamp bead 112 distributed in a rectangular array, and the energy provided to the battery cell is more concentrated. In addition, in the connection area 113 corresponding to the interval between the battery cells, the lamp bead 112 is no longer set, which avoids the setting of the lamp bead 112 in the area where the light intensity is not required, saving costs and energy.

[0066] The above implementation modes are only for illustrating the technical concept and features of the utility model, and their purpose is to allow people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A backlight module for processing a battery cell, characterized in that: include: A light-emitting component, the light-emitting component comprising a substrate, the substrate comprising at least one illumination area, and the illumination area is provided with a plurality of lamp beads fixed on the same side of the substrate; A reflective component, wherein the reflective component includes a plate body, the plate body is fixed on a substrate, the plate body is provided with a light guide hole penetrating the plate body along a thickness direction, the light guide hole corresponds to the position of a lamp bead, the light guide hole forms a horn structure, the light guide hole includes a first opening, a second opening having a diameter larger than the first opening, and a reflective surface between the first opening and the second opening, the second opening is located on a side away from the substrate, the lamp bead is completely embedded in the corresponding light guide hole, and the light emitted by the lamp bead is reflected by the reflective surface and then emitted from the second opening.

2. The backlight module for processing a battery cell according to claim 1, characterized in that: The cross section of the reflective surface is an inclined surface, and the focus of the inclined surface is arranged on the central axis of the light guide hole.

3. The backlight module for processing a battery cell according to claim 1, characterized in that: The light guide holes are not connected to each other, and the second openings of adjacent light guide holes are closely adjacent to each other.

4. The backlight module for processing a battery cell according to claim 1, characterized in that: The inclination angle of the reflective surface relative to the central axis of the light guide hole is 40-60°.

5. The backlight module for processing a battery cell according to any one of claims 1 to 4, characterized in that: In each of the illumination areas, the lamp beads are arranged equidistantly along the first direction to form a light-emitting unit, and multiple unit light-emitting units are arranged equidistantly in the second direction. The multiple lamp beads of each light-emitting unit are staggered with the lamp beads of adjacent light-emitting units in the first direction and the second direction.

6. The backlight module for processing a battery cell according to claim 1, characterized in that: The plate body is an aluminum plate; the lamp beads are one or more of ultraviolet lamps and RGB LED lamps.

7. The backlight module for processing a battery cell according to claim 1, characterized in that: The backlight module also includes: An insulating gasket, the insulating gasket is fixed on the side of the plate body opposite to the base plate, and the insulating gasket is provided with a light-transmitting hole corresponding to the illumination area; High temperature glass, the high temperature glass is fixed on the side of the insulating gasket opposite to the plate body, and the high temperature glass is light-transmitting glass.

8. The backlight module for processing a battery cell according to claim 1, characterized in that: The substrate further comprises connection areas located at both sides of the illumination area in the first direction. No light beads are arranged on the substrate in the connection areas. The backlight module is fixed by positioning pieces located in the connection areas to form an integral structure.

9. The backlight module for processing a battery cell according to claim 8, characterized in that: The illumination areas are arranged corresponding to the cells that can be moved to the light-emitting side thereof, each illumination area illuminates the corresponding cell, the orthographic projection of the illumination area on the corresponding cell can cover the entire cell, and each illumination area is connected to a controller; There is a gap between adjacent battery cells, and the gap corresponds to the connection area.

10. A battery light injection furnace, characterized in that: include: A housing, wherein the housing defines a processing cavity, and the backlight module according to any one of claims 1 to 9 is arranged in the processing cavity; A transmission device passes through the housing along a second direction, and is used for transmitting the battery slice.

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