Battery shell, battery and electric device

Abstract

The utility model relates to the technical field of batteries, and provides a battery shell, a battery and an electric device. The battery shell comprises an outer shell with an inner cavity and an inner shell arranged in the inner cavity, at least part of the inner shell is connected to the outer shell, the inner shell comprises a containing part, the bottom wall of the inner shell and the inner bottom wall of the outer shell are arranged in a spaced mode, the bottom wall of the inner shell is used for making contact with the bottom of the battery cell, and at least part of the inner shell is of a deformable structure. The battery core and the electrolyte are contained in the inner shell, so that the battery core can effectively absorb and utilize the electrolyte remaining at the bottom of the inner shell, full utilization of all the electrolyte is guaranteed, and the performance of the battery is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery shell, a battery and an electrical device. Background Art

[0002] During the assembly process of the battery, the electrolyte needs to be injected into the interior of the shell. However, for a cell with tabs at both ends and a wound structure, when it is placed in the shell with its central axis parallel to the bottom of the shell, the cell wall is covered with insulating tape, which means that the electrolyte can only enter the cell through the side of the cell (i.e., the end face of the cell with the tab), and the electrolyte cannot enter the cell from the bottom of the cell. Then, in the later stage of the use of the cell, the electrolyte does not rise high enough in the cell, resulting in the upper end of the cell not being soaked in the electrolyte, and the cell near the top cover drying up, and even lithium precipitation in lithium-ion batteries. Therefore, existing battery structures like this not only result in the electrolyte not being fully utilized, but also seriously affect the performance of the cell. How to make full use of the electrolyte has become a current technical difficulty in the energy industry. Utility Model Content

[0003] The purpose of the utility model is to provide a battery housing, a battery and an electrical device, aiming to solve the technical problem that the residual electrolyte in the existing battery cannot be effectively utilized.

[0004] In the first aspect, the present application provides a battery shell, comprising an outer shell and an inner shell, the outer shell having an inner cavity, the inner shell being arranged in the inner cavity, at least a portion of the inner shell being connected to the outer shell, the inner shell comprising a accommodating portion for accommodating a battery cell, the accommodating portion being a cavity in the inner shell, the bottom wall of the inner shell being spaced apart from the inner bottom wall of the outer shell, the bottom wall of the inner shell being used to contact the bottom of the battery cell, and at least a portion of the inner shell being a deformable structure.

[0005] Optionally, the bottom of the inner shell is a deformable structure, thereby reserving expansion space for the battery cell.

[0006] Optionally, the distance between the bottom wall of the inner shell and the inner bottom wall of the outer shell is 0.5 mm-2 mm, which can accommodate the expansion of the battery cell.

[0007] Optionally, the top opening of the inner shell is a quadrilateral, and the side of the inner shell can be formed by connecting four quadrilaterals in sequence.

[0008] Optionally, the inner shell has a connecting portion connected to the outer shell, the connecting portion is located between the inner shell and the outer shell, and the inner shell is connected to the outer shell through the connecting portion.

[0009] Optionally, there may be a plurality of connecting parts, and the connecting parts are arranged on the outer side of the inner shell.

[0010] Optionally, the shell may be in a cube shape, and the shell may be made of a conductive material, specifically a metal material.

[0011] Optionally, a positioning groove is provided on the inner side of the shell, and the connecting portion is embedded in the positioning groove, thereby improving the space utilization of the shell.

[0012] Optionally, at least a portion or all of the connecting portion is embedded and fixed in the positioning groove.

[0013] Optionally, the upper portion of the inner side of the outer shell has at least one first positioning groove, the connecting portion is embedded in the first positioning groove, and the inner shell can be fixed by the connecting portion and the first positioning groove.

[0014] Optionally, the distance between the first positioning groove and the top of the outer shell is 0.5mm-1.5mm, the first positioning groove can be as close to the top of the outer shell as possible, and the top of the first positioning groove can be lower than the top of the inner shell or flush with the top of the inner shell.

[0015] Optionally, the width of the cavity of the inner shell gradually increases from the bottom wall of the inner shell to the top of the inner shell, so that the electrolyte at the bottom of the inner shell can be more concentrated and this part of the electrolyte can be more effectively utilized.

[0016] Optionally, the lower portion of the inner side of the outer shell has at least one second positioning groove, the connecting portion is embedded in the second positioning groove, and the inner shell can be fixed by the connecting portion and the second positioning groove.

[0017] Optionally, the distance between the second positioning groove and the inner bottom wall of the outer shell is 1 mm-2.5 mm, and the bottom wall of the inner shell is arranged between the second positioning groove and the inner bottom wall of the outer shell.

[0018] Optionally, the material of the inner shell is an insulating material, and the material of the inner shell is a high temperature resistant and corrosion resistant material.

[0019] In a second aspect, the present application provides a battery comprising a battery cell, an electrolyte and a battery shell, wherein the battery cell and the electrolyte are both contained in the accommodating portion, the battery cell is a wound battery cell, and the tabs of the battery cell face the side of the inner shell.

[0020] In a third aspect, the present application provides an electrical device comprising the above-mentioned battery.

[0021] The battery housing, battery, and electrical device provided by the utility model have the following beneficial effects:

[0022] In the battery case described in the first aspect, the inner shell of the shell is arranged in the inner cavity of the outer shell, at least part of the inner shell is connected to the outer shell, the inner shell includes a accommodating portion for containing electrolyte and accommodating battery cells, the accommodating portion is a cavity in the inner shell, wherein the bottom wall of the inner shell is used to contact the bottom of the battery cell, at least part of the inner shell is a deformable structure, the bottom wall of the inner shell is spaced apart from the inner bottom wall of the outer shell to provide expansion space for the battery cell, when the battery cell is placed in the accommodating portion, the battery cell can squeeze out the electrolyte in the inner shell to a certain height, and then the electrolyte is very The electrolyte can better enter the interior of the battery cell through the side of the battery cell. Since the electrolyte level is raised, the distance for the electrolyte to reach the upper end of the battery cell can be greatly shortened, so that the battery cell is soaked with electrolyte from bottom to top. At the same time, since the bottom wall of the inner shell and the bottom of the battery cell can be in direct contact with each other without a gap, even if the amount of electrolyte decreases in the later stage of the cycle, the battery cell can still be in contact with the electrolyte, which reduces the difficulty of liquid absorption of the battery cell and makes it possible to fully utilize 100% of the electrolyte without wasting, thereby solving the technical problem that the residual electrolyte cannot be effectively utilized.

[0023] In the battery described in the second aspect, similarly, even if the amount of electrolyte becomes less in the later stage of the cycle, the battery cell in the inner shell can still maintain contact with the electrolyte located at the bottom of the inner shell, effectively absorbing and utilizing the electrolyte remaining at the bottom of the inner shell, so that the electrolyte can be fully utilized 100% without being wasted, thereby solving the technical problem that the residual electrolyte cannot be effectively utilized.

[0024] The electrical device provided in the present application effectively improves the practicality and service life of the electrical device by adopting the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] Figure 1 A structural diagram of a battery housing provided in an embodiment of the present utility model;

[0027] Figure 2 A structural diagram of a housing provided in an embodiment of the present utility model;

[0028] Figure 3 A schematic diagram of the dimensions of a battery housing provided in an embodiment of the present utility model;

[0029] Figure 4 A structural diagram of a battery provided in an embodiment of the present utility model;

[0030] Among them, the reference numerals in the figures are:

[0031] 1. Outer shell; 2. Inner shell; 21. Connecting part;

[0032] 11. First positioning groove; 12. Second positioning groove;

[0033] 3. Battery cell; 4. Electrolyte; 5. Top cover;

[0034] L1, the distance between the first positioning groove and the top of the housing;

[0035] L2, the distance between the second positioning groove and the inner bottom wall of the housing;

[0036] L3, the distance between the bottom wall of the inner shell and the inner bottom wall of the outer shell. DETAILED DESCRIPTION

[0037] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0038] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout this specification, not all references are to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0039] In the description of the present invention, it should be understood that the terms "length", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0041] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0042] In the prior art, the inventor discovered that there is a certain gap between the battery cell of a conventional battery and the bottom of the aluminum shell (the battery cell is fixed to the top cover, and the battery cell will expand during the charging and discharging process. In order to reserve expansion space for the battery cell, a gap is reserved at the bottom of the battery cell and the bottom of the aluminum shell). Originally, for a battery cell with tabs at both ends and a wound structure, the electrolyte in the battery can only enter the battery cell through the side of the battery cell (that is, the end face of the battery cell with the tab). In addition, due to the gap reserved between the battery cell and the bottom of the aluminum shell, the amount of electrolyte in the aluminum shell is further reduced in the later stage of the cycle. When the electrolyte level is lower than the bottom of the battery cell, the electrolyte remaining at the bottom of the shell cannot contact the side of the battery cell, and the battery cell is completely unable to absorb the electrolyte at the bottom of the aluminum shell, resulting in a small amount of electrolyte remaining at the bottom of the shell, causing waste.

[0043] In order to solve the above problems, the battery housing, battery and electrical device in the embodiments of the present invention are now described.

[0044] Please refer to Figure 1 The present application provides a battery shell, comprising an outer shell 1 and an inner shell 2, wherein the outer shell 1 has an inner cavity, the inner shell 2 is arranged in the inner cavity, at least part of the inner shell 2 is connected to the outer shell 1, the inner shell 2 includes a accommodating portion for accommodating a battery cell, the bottom wall of the inner shell 2 is spaced apart from the inner bottom wall of the outer shell 1, the bottom wall of the inner shell 2 is used to contact the bottom of the battery cell, and at least part of the inner shell 2 is a deformable structure.

[0045] Specifically, the bottom of the inner shell 2 is a deformable structure. The bottom wall of the inner shell 2 is spaced apart from the inner bottom wall of the outer shell 1, creating a space for the battery cell to expand. The deformable bottom of the inner shell 2 does not hinder the battery cell from expanding into the reserved expansion space. Furthermore, the deformable bottom of the inner shell 2 conforms to the shape of the battery cell, improving its fit and maximizing the amount of electrolyte squeezed out of the bottom. The inner shell 2 can be made of a flexible bag made of a flexible material, or it can be made of rubber material only at the bottom.

[0046] Specifically, the inner shell 2 has a connecting portion 21 connected to the outer shell 1 . The connecting portion 21 is located between the inner shell 2 and the outer shell 1 . The inner shell 2 is connected to the inner side wall of the outer shell 1 through the connecting portion 21 .

[0047] Specifically, a positioning groove is provided on the inner side of the outer shell 1, and at least a portion or all of the connecting portion 21 is embedded in the positioning groove. The provision of the positioning groove improves the connection reliability between the outer shell 1 and the inner shell 2, and also reduces the gap between the side walls of the outer shell 1 and the side walls of the inner shell 2, thereby improving space utilization.

[0048] In some embodiments, the housing 1 may be configured as a cubic structure, with at least one first positioning groove 11 being provided on the upper inner portion of the housing 1 , and the connecting portion 21 being embedded in the first positioning groove 11 .

[0049] For example, see Figure 2 The upper part of the inner side of the outer shell 1 has four first positioning grooves 11, and the two first positioning grooves 11 opposite to each other are set to the same size. The four side surfaces of the inner shell 2 respectively have connecting parts 21 corresponding to the size of each first positioning groove 11.

[0050] Specifically, see Figure 3 The distance L1 between the first positioning groove 11 and the top of the housing 1 can be 0.5 mm-1.5 mm.

[0051] In some embodiments, the first positioning groove 11 is arranged at the upper part of the inner side of the outer shell 1, and the distance L1 between the first positioning groove 11 and the top of the outer shell 1 is limited. The function is: when the inner shell 2 is a flexible bag structure, the upper part of the inner shell 2 is fixed to the outer shell 1, and the lower part is in a free state, which can ensure the fit between the battery cell and the inner shell 2. Even if the battery cell shakes due to bumps and collisions, the flexible bag can fit well with the battery cell, thereby squeezing out the electrolyte at the bottom of the inner shell 2 to the greatest extent, and effectively absorbing and utilizing the electrolyte remaining at the bottom of the inner shell 2, so that the electrolyte can be fully utilized 100% without being wasted.

[0052] In some embodiments, the lower portion of the inner side of the outer shell 1 further comprises at least one second positioning groove 12, and the inner shell 2 comprises a connecting portion 21 embedded in the second positioning groove 12. When the sidewall of the inner shell 2 is a rigid structure, the addition of the second positioning groove 12 can further improve the connection reliability between the outer shell 1 and the inner shell 2, preventing the inner shell 2 from falling off due to the impact of the battery cell when shaking.

[0053] For example, see Figure 2 The two narrow sides of the inner lower portion of the outer shell 1 each have a second positioning groove 12. The two second positioning grooves 12 are oppositely arranged and have the same size. The inner shell 2 has a connecting portion 21 corresponding to the size of the second positioning grooves 12. The two connecting portions 21 on the outer lower portion of the inner shell 2 are respectively embedded in the second positioning grooves 12. Providing the second positioning grooves 12 on the narrow sides of the outer shell 1 can reduce the internal space occupied by the battery, thereby improving space utilization.

[0054] Specifically, see Figure 3The distance L2 between the second positioning groove 12 and the inner bottom wall of the outer shell 1 can be 1mm-2.5mm. If the distance L2 is too small, when the battery cell expands, the bottom of the inner shell 2 will be pulled, and the connection portion 21 located at the second positioning groove 12 may be pulled off. If the distance L2 is too large, the fixing effect of the lower portion of the inner shell 2 is limited.

[0055] Specifically, see Figure 3 The distance L3 between the bottom wall of the inner shell 2 and the inner bottom wall of the outer shell 1 can be 0.5mm-2mm. Limiting the distance L3 within this range provides sufficient expansion space for the battery cell without taking up too much internal space of the battery.

[0056] In some embodiments, the width of the cavity of the inner shell 2 gradually increases from the bottom wall of the inner shell 2 to the top of the inner shell 2. This configuration ensures that the bottom of the inner shell 2 tightly wraps around the bottom of the battery cell, thereby squeezing out the electrolyte at the bottom of the inner shell 2 to the greatest extent possible and effectively absorbing and utilizing the electrolyte remaining at the bottom of the inner shell 2, so that the electrolyte can be fully utilized without being wasted.

[0057] In some embodiments, the battery case of the present application includes an outer metal shell 1 and an inner insulating shell 2, which are fixedly connected to the metal shell to form the battery case. The bottom of the inner shell 2 is in direct contact with the bottom of the battery cell, and a spacing L3 is provided between the outer bottom of the inner shell 2 and the inner bottom of the outer shell 1. L3 is set within an appropriate range, and the insulating material is flexible, ensuring that appropriate expansion space is reserved for the battery cell. At the same time, if L3 is too small, the battery cell will have insufficient expansion space, affecting its cycle life. If L3 is too large, the aluminum shell will have redundant height, resulting in waste.

[0058] In some embodiments, the position where the metal outer shell and the insulating inner shell are fixedly connected is set near the opening end of the shell and near the bottom position of the side of the shell, and the other positions of the two are not connected. The insulating inner shell covers the battery cell, and the thickness of the insulating inner shell is 0.5mm-1mm, thereby reducing the gap between the insulating inner shell and the battery cell. After liquid injection, the liquid level of the electrolyte can be increased, shortening the distance for the electrolyte to reach the upper end of the battery cell.

[0059] Specifically, the fixed connection position is at a distance L1 from the open end of the metal shell and at a distance L2 from the bottom of the metal shell. In this application, the inner wall of the metal shell has six grooves connected to the insulating inner shell, and the insulating inner shell is correspondingly provided with six protrusions as connecting portions 21 embedded in the grooves. The inner wall of the shell and the insulating inner shell are connected together by a concave-convex fit between the grooves and the protrusions, and the grooves and protrusions are connected together by an interference fit.

[0060] Exemplarily, the groove is rectangular, and the length of the large surface groove at the opening of the outer shell 1 is 80mm-110mm, and the width is 1mm-3mm; the length of the side groove at the opening of the outer shell 1 is 1mm-10mm, and the width is 1mm-3mm; the side bottom groove of the outer shell 1 is the same size as the side groove at the opening. In addition, the boss is rectangular, and the length of the large surface boss of the inner shell 2 is 70mm-100mm, and the width is 1.2mm-3.2mm; the length of the side boss is 1mm-9mm, and the width is 1.2mm-3.2mm, and each boss is connected to each groove accordingly. The depth of the groove can be unified to 0.5mm-1mm. The advantage of this is that it is assembled together through interference fit, and the matching method will not fail before the end of the battery life.

[0061] In some embodiments, the outer shell 1 is an aluminum shell with a height of 65 mm, a length of 120 mm, and a width of 12 mm. The wall thickness of the large surface (i.e., the side with the largest area) of the aluminum shell is 1.2 mm, the thickness of the side (i.e., the side with the smallest area) is 1 mm, and the bottom thickness is 1.5 mm. The large surface groove of the inner wall is 100.5 mm long and 2.5 mm wide. The groove of the side is 10.5 mm long and 2.5 mm wide, and the distance between the groove and the opening is 0.5 mm. The groove of the bottom side is 10.5 mm long and 2.5 mm wide, and is 1 mm away from the bottom of the aluminum shell. The depth of the groove is 0.5 mm. The length of the inner shell 2 is 116 mm, the width is 8 mm, the height is 63 mm, and the thickness is 0.5 mm. The large surface boss of the inner shell 2 is 100 mm long, 2 mm wide, and 0.3 mm deep. The boss of the side is 10 mm long, 2 mm wide, and 0.5 mm deep. The bottom side projections of inner shell 2 are 10mm long, 2mm wide, and 0.5mm deep. The bottom of inner shell 2 is 0.5mm away from the bottom of the aluminum shell. Place the insulating inner shell into the aluminum shell. Use a robot to insert the bottom projections of inner shell 2 into the grooves at the bottom of the aluminum shell. Then, insert the projections at the opening into the grooves at the opening of the aluminum shell, securing the insulating inner shell and aluminum shell together.

[0062] While existing technologies can mitigate electrolyte starvation at the top of the cell by increasing the injection volume, improving the wettability of the diaphragm, and reducing the porosity of the electrode, these methods all increase the weight and cost of the cell. The battery case of this application, however, integrates the insulating inner shell within the metal outer shell, reducing the difficulty of electrolyte absorption and ensuring 100% electrolyte utilization without wastage.

[0063] In addition, see Figure 4 The present application also provides a battery, including a battery cell 3, an electrolyte 4 and the above-mentioned battery shell, the battery cell 3 and the electrolyte 4 are both accommodated in the accommodating portion of the inner shell 2, the battery cell 3 is a wound battery cell, the tabs of the battery cell 3 face the side of the inner shell 2, and the outer shell 1 is sealed and connected to the top cover 5.

[0064] It is understood that the battery cell 3 is the component in the battery where the electrochemical reaction occurs. The battery cell 3 includes a first electrode sheet, a second electrode sheet, and a separator for electrically isolating the first and second electrode sheets. The first and second electrode sheets have opposite polarities. During processing, the first electrode sheet, separator, and second electrode sheet are stacked in sequence and then wound to form a wound battery cell.

[0065] Among them, after the battery is filled with liquid, the electrolyte 4 is all stored in the accommodating portion of the inner shell 2, and the battery cell 3 is directly immersed in the electrolyte 4 and squeezes the electrolyte 4 out to a certain height. Under the same injection volume, the electrolyte 4 level in the accommodating portion of the present application is higher, which can greatly shorten the distance for the electrolyte 4 to reach the upper part of the battery cell, and is more conducive to the absorption and infiltration of the electrolyte 4 by the upper part of the battery cell. At the same time, the inner shell 2 and the bottom of the battery cell 3 are in close contact without a gap, which can ensure that the battery cell 3 fully absorbs and utilizes the electrolyte 4, and no residual electrolyte 4 is wasted. In addition, isolating the electrolyte 4 from the metal outer shell 1 can prevent the metal outer shell 1 from being corroded by the electrolyte 4, or prevent the pole piece inside the battery cell 3 from coming into contact with the metal outer shell 1 after powder is shed.

[0066] Specifically, the battery may be a lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, and the battery may be a square-shell battery.

[0067] The present application also provides an electrical device comprising the aforementioned battery. The electrical device may include, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, and the like. The electric toy may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the spacecraft may include airplanes, rockets, space shuttles, and spacecraft, among others.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery housing, characterized in that: include: A housing (1) having an inner cavity; An inner shell (2) is arranged in the inner cavity, at least a portion of the inner shell (2) is connected to the outer shell (1), the inner shell (2) comprises a receiving portion for receiving the battery cell, the bottom wall of the inner shell (2) is spaced apart from the inner bottom wall of the outer shell (1), and the bottom wall of the inner shell (2) is used to contact the bottom of the battery cell; At least a portion of the inner shell (2) is a deformable structure.

2. The battery case according to claim 1, wherein: The bottom of the inner shell (2) is a deformable structure.

3. The battery case according to claim 1, wherein: The distance between the bottom wall of the inner shell (2) and the inner bottom wall of the outer shell (1) is 0.5 mm to 2 mm.

4. The battery case according to claim 1, wherein: The inner shell (2) has a connecting portion (21) connected to the outer shell (1), and the connecting portion (21) is located between the inner shell (2) and the outer shell (1).

5. The battery case according to claim 4, wherein: A positioning groove is provided on the inner side of the housing (1), and the connecting portion (21) is embedded in the positioning groove.

6. The battery case according to claim 5, wherein: The upper portion of the inner side of the housing (1) has at least one first positioning groove (11), and the connecting portion (21) is embedded in the first positioning groove (11).

7. The battery case according to claim 6, wherein: The distance between the first positioning groove (11) and the top of the housing (1) is 0.5 mm to 1.5 mm.

8. The battery case according to any one of claims 1 to 7, characterized in that: The width of the cavity of the inner shell (2) gradually increases from the bottom wall of the inner shell (2) to the top of the inner shell (2).

9. A battery, characterized in that: The battery comprises a battery cell (3), an electrolyte (4) and a battery shell as claimed in any one of claims 1 to 8, wherein the battery cell (3) and the electrolyte (4) are both accommodated in the accommodating portion, the battery cell (3) is a wound battery cell, and the tabs of the battery cell (3) face the side of the inner shell (2).

10. An electrical device, characterized in that: Comprising the battery of claim 9.

Images