Battery case, battery, and battery pack

Abstract

The application provides a battery shell, a battery and a battery pack, and relates to the technical field of batteries. The battery shell comprises a flexible supporting cylinder and an end cover. At least one end of the flexible supporting cylinder is provided with an opening, and the end cover is connected to the flexible supporting cylinder and used for plugging the opening. A containing cavity is formed between the flexible supporting cylinder and the end cover, and the containing cavity is used for containing a pole group of the battery. The flexible supporting cylinder is configured to expand when the pole group expands. The battery shell of the application can absorb the radial expansion force of the pole group by arranging the flexible supporting cylinder and expanding the flexible supporting cylinder when the pole group expands, thereby improving the expansion performance of the battery shell during the charging and discharging cycles of the battery, reducing the internal stress of the battery shell caused by poor expansion effect, and further reducing the capacity attenuation of the battery and improving the cycle life of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery casing, a battery, and a battery pack. Background Technology

[0002] Currently, cylindrical and prismatic batteries consist of a casing and electrode arrays located within the casing. The casing includes a body and end caps. The body has at least one opening, and the end caps are used to seal the opening. The body and end caps are made of aluminum alloy or nickel-plated steel. The body is integrally formed, and the end caps are connected to the body by laser welding.

[0003] During battery charge-discharge cycles, the electrode materials of the internal electrode assembly expand in volume. The casing constrains this expansion, causing some of the expansion force to be converted into stress acting within the casing. Under the stress generated by long-term charge-discharge cycles, this can easily lead to an increase in the battery's internal resistance and a decrease in battery capacity, thereby reducing the battery's cycle life. Utility Model Content

[0004] This application provides a battery casing, a battery, and a battery pack to solve the problem of low battery cycle life caused by insufficient expansion force of the battery casing.

[0005] In a first aspect, this application provides a battery casing, comprising:

[0006] A flexible support cylinder, wherein at least one end of the flexible support cylinder has an opening;

[0007] An end cap, which is connected to the flexible support cylinder, is used to seal the opening;

[0008] A receiving cavity is formed between the flexible support cylinder and the end cap, the receiving cavity being used to receive the battery electrode assembly, and the flexible support cylinder being configured to expand when the electrode assembly expands.

[0009] In one possible implementation, the flexible support cylinder is an aluminum-plastic film cylinder, which is formed by winding multiple layers of aluminum-plastic film.

[0010] In one possible implementation, the thickness d of the flexible support cylinder satisfies: 85μm≤d≤230μm.

[0011] In one possible implementation, the end cap includes a tube and a cover, the cover being connected to one end of the tube and the other end of the tube being inserted into the flexible support cylinder.

[0012] In one possible implementation, the tube body is interference-fitted to the flexible support cylinder, and the inserted tube body is thermally pressed to connect the flexible support cylinder.

[0013] In one possible implementation, the cross-section of the tube body is adapted to the cross-section of the flexible support cylinder body;

[0014] And / or, it also includes an elastic buffer disposed between the cover and the pole group, the elastic buffer being used to absorb the axial expansion force of the pole group.

[0015] In one possible implementation, the end cap is any one of an aluminum alloy end cap, a copper alloy end cap, a copper end cap, or a nickel-plated steel end cap.

[0016] In one possible implementation, an insulating protective layer is also included, which is disposed on the outer surface of the flexible support cylinder.

[0017] Secondly, this application provides a battery, including the battery casing as described in any of the above embodiments.

[0018] Thirdly, this application provides a battery pack including the battery described above.

[0019] The battery casing, battery, and battery pack provided in this application have a flexible support cylinder in the battery casing. The flexible support cylinder expands when the electrode assembly expands, which can absorb the expansion force of the electrode assembly. This is beneficial to improving the expansion performance of the battery casing during battery charge and discharge cycles, thereby reducing the internal stress caused by poor expansion effect of the battery casing, which in turn helps to reduce the decay of battery capacity and improve the cycle life of the battery. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0021] Figure 1 This is a partial disassembly diagram of the battery according to an embodiment of this application;

[0022] Figure 2 for Figure 1 A schematic diagram of the battery casing.

[0023] Explanation of reference numerals in the attached figures:

[0024] 100 - Flexible support cylinder;

[0025] 200-end cap; 210-tube body; 220-cover body;

[0026] 300-pole group;

[0027] 400 - Elastic buffer.

[0028] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection via an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0032] The terms "first," "second," "third," "fourth," etc., used in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in a sequence other than those illustrated or described herein.

[0033] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or components is not necessarily limited to those steps or components that are explicitly listed, but may include other steps or components that are not explicitly listed or that are inherent to those processes, methods, products, or apparatuses.

[0034] Both cylindrical and prismatic lithium-ion batteries include a battery casing and electrode arrays located within the casing. The battery casing typically consists of a metal body and end caps. The body is a one-piece molded structure, while the end caps are fixedly connected to the body using methods such as laser welding. Together, the body and end caps form a cavity to house the electrode arrays.

[0035] During the charge-discharge cycle of a battery, the electrode materials inside the electrode assembly undergo continuous and reciprocating volume expansion and contraction. Currently, the battery casing constrains the expansion of the electrode assembly, preventing the expansion force from being effectively released. Some of this expansion force is converted into stress that continuously acts on the inside of the battery casing. Under the influence of stress, the battery's internal resistance can easily increase and its capacity can decrease, thereby reducing the battery's cycle life.

[0036] This application provides a battery casing, a battery, and a battery pack to solve the problem of low battery cycle life caused by insufficient expansion force of the battery casing. The structure of the battery casing is described below with reference to the accompanying drawings.

[0037] like Figure 1 and Figure 2 As shown, this application provides a battery casing including a flexible support cylinder 100 and an end cap 200. At least one end of the flexible support cylinder 100 has an opening, and the end cap 200 is connected to the flexible support cylinder 100 to seal the opening. A receiving cavity is formed between the flexible support cylinder 100 and the end cap 200 to receive a battery electrode assembly 300. The flexible support cylinder 100 is configured to expand when the electrode assembly 300 expands.

[0038] The battery casing of this application embodiment, by providing a flexible support cylinder 100, and the flexible support cylinder 100 expands along with the electrode assembly 300 when the electrode assembly 300 expands, can absorb the expansion force of the electrode assembly 300, which is beneficial to improving the expansion performance of the battery casing during battery charge and discharge cycles, and to reducing the internal stress of the battery casing caused by poor expansion effect, thereby reducing the decay of battery capacity, and thus improving the cycle life of the battery.

[0039] The core function of the flexible support cylinder 100 in this application is that, while fulfilling the supporting effect of the battery casing, it can actively adapt to the internal expansion of the battery during charge-discharge cycles by utilizing its own flexibility. When the battery is charged and discharged, the electrode assembly 300 expands, and the flexible support cylinder 100 expands accordingly. Compared with the rigid battery casing, it has better expansion performance. Therefore, the deformation effect of the flexible support cylinder 100 during expansion is better than that of the rigid casing.

[0040] In one possible implementation, the flexible support cylinder 100 is an aluminum-plastic film cylinder, which is formed by winding multiple layers of aluminum-plastic film. This multi-layered aluminum-plastic film cylinder, serving as the flexible support cylinder 100, not only provides support for the battery casing but also expands and deforms when the electrode assembly 300 expands, thereby reducing internal stress in the battery casing and improving battery cycle life.

[0041] Rigid battery casings also have the problem of being heavy. In addition, in order to improve the performance of rigid casings during expansion, deformation space needs to be reserved inside the battery casing, which occupies the space inside the cavity, thereby reducing the size of the electrode assembly 300 and thus reducing the energy density of the battery.

[0042] The multi-layer aluminum-plastic film in this embodiment also has the advantage of being lightweight, which facilitates the lightweight design of the battery casing. Furthermore, since the aluminum-plastic film cylinder has a good expansion effect, there is no need to reserve deformation space in the receiving cavity, or only a small deformation space is needed, thereby reducing the space occupied in the receiving cavity. This allows the size of the electrode assembly 300 to be made larger, which in turn helps to improve the energy density of the battery.

[0043] In practice, the multiple layers of aluminum-plastic film are joined by hot pressing. Multiple layers of pre-cut aluminum-plastic film sheets are stacked together, ensuring the edges to be joined are perfectly aligned. A dedicated hot press head or rollers are used to apply heat and pressure to the multiple layers of aluminum-plastic film. Under the combined action of heat and pressure, the sealing layers of the inner layers of the multiple layers of aluminum-plastic film melt simultaneously and join together. After cooling and solidification, a single, multi-layered composite sheet is formed. Finally, the sheet is wound to the required specifications to form a flexible support cylinder 100.

[0044] In one possible implementation, the thickness d of the flexible support cylinder 100 satisfies: 85μm ≤ d ≤ 230μm. This satisfies both the supporting function and the expansion and deformation requirements of the flexible support cylinder 100. When the thickness d of the flexible support cylinder 100 is less than 85μm, the supporting effect is poor, failing to meet the requirement of the flexible support cylinder 100 and end cap 200 forming a stable battery casing. When the thickness d of the flexible support cylinder 100 is greater than 230μm, it affects the expansion and deformation effect of the flexible support cylinder 100.

[0045] In specific implementation, the thickness d of the flexible support cylinder 100 can be any value among 85μm, 90μm, 110μm, 120μm, 130μm, 140μm, 150μm, 160μm, 170μm, 180μm, 190μm, 200μm, 210μm, 220μm, or 230μm, or any value from 85μm to 230μm. The thickness d of the flexible support cylinder 100 can be determined based on the specifications and expansion deformation of the battery casing. In the embodiments of this application, the number of aluminum-plastic film layers can be 3, 4, or 5, etc., and the number of aluminum-plastic film layers can be determined according to the specifications of the battery casing and the thickness of a single layer of aluminum-plastic film.

[0046] It should be noted that, in addition to being an aluminum-plastic film cylinder, the flexible support cylinder 100 in this embodiment can also be a ceramic-coated polymer cylinder. The ceramic-coated polymer film is formed by depositing a layer of ceramic, such as alumina or silicon oxide, onto a polymer base film (e.g., PET or PI) using vacuum deposition or other methods as a barrier layer. Using a ceramic-coated polymer film to fabricate the flexible support cylinder 100 can also meet the application requirements. Furthermore, other materials with both flexibility and support properties can also be used to fabricate the flexible support cylinder 100.

[0047] In this embodiment, the end cap 200 is a rigid end cap 200. On the one hand, the rigid end cap 200 is beneficial to improve the support effect on the flexible support cylinder 100, so that the battery casing has better support performance. On the other hand, the rigid end cap 200 can also meet the installation and arrangement requirements of electrical connection components, such as poles.

[0048] In one possible implementation, the end cap 200 is any one of an aluminum alloy end cap, a copper alloy end cap, a copper end cap, or a nickel-plated steel end cap. The choice of material for the end cap 200 is based on the requirements for mechanical strength and conductivity. Among them, aluminum alloy end caps are lightweight and have high strength, copper alloy end caps have excellent conductivity, and nickel-plated steel end caps balance strength and corrosion resistance.

[0049] For example, aluminum alloy end caps can be made of 6-series or 7-series aluminum alloys, combining the advantages of lightweight and high strength. For instance, 6061 aluminum alloy end caps can have a thickness ranging from 2mm to 5mm. Of course, the thickness of the aluminum alloy end cap can also be determined according to application requirements.

[0050] Copper end caps and copper alloy end caps have good electrical and thermal conductivity. Nickel-plated steel end caps offer better strength and cost-effectiveness. It should be noted that end cap 200 can be made of other metals besides those mentioned above. Furthermore, end cap 200 can also be made of insulating material, as long as it meets the connection and usage requirements of end cap 200.

[0051] In one possible implementation, such as Figure 2 As shown, the end cap 200 includes a tube body 210 and a cap body 220. The cap body 220 is connected to one end of the tube body 210, and the other end of the tube body 210 is inserted into the flexible support cylinder 100. This arrangement allows the tube body 210 to achieve a reliable, sealed connection with the flexible support cylinder 100 and provides support for the flexible support cylinder 100. The cap body 220 is used to install components such as explosion-proof valves, injection ports, and poles. The insertion of the tube body 210 into the flexible support cylinder 100 facilitates the formation of a stable annular connection area, thereby improving the reliability of the connection between the end cap 200 and the flexible support cylinder 100.

[0052] In one possible implementation, the tube 210 is interference-fitted with the flexible support cylinder 100, and the tube 210 and the flexible support cylinder 100 are heat-pressed together. This interference fit allows the end cap 200 to be positioned on the flexible support cylinder 100 before the heat-pressing process, thereby improving the efficiency of the heat-pressing connection.

[0053] The hot-press connection uses heating to bond the metal surfaces of the flexible support cylinder 100 and the tube 210 together, resulting in a good seal between the tube 210 and the flexible support cylinder 100 in the connected state. This improves the battery casing's leak resistance under complex operating conditions, while the hot-press process reduces assembly tolerances and ensures structural stability.

[0054] The tube body 210 and the flexible support cylinder 100 are connected by both interference fit and thermocompression, simultaneously meeting the requirements for connection strength and sealing at the connection point. Furthermore, the interference fit and thermocompression connection provide a dual connection effect. Even if minor imperfections occur at the thermocompression sealing interface under extreme conditions, the mechanical interlock of the interference fit maintains the structural integrity, preventing instantaneous failure and buying time for safety inspection and handling. Even if the interference fit becomes slightly loose due to long-term vibration, the thermocompression sealing layer, as a second line of defense, still ensures a good sealing effect.

[0055] In practice, the tube 210 is inserted outside the flexible support cylinder 100. With this arrangement, when the pressure inside the battery casing increases, the flexible support cylinder 100 bulges outward, thus generating greater pressure on the inner wall of the tube 210 fitted on the outside. The greater the pressure, the tighter the sealing surfaces between the tube 210 and the flexible support cylinder 100 fit, thereby improving the sealing reliability between them.

[0056] In addition, the tube 210 is inserted outside the flexible support cylinder 100, so that the tube 210 can completely wrap around the most vulnerable heat-sealed edge area of ​​the flexible cylinder end from the outside. This helps to effectively resist the wear of the flexible support cylinder 100 end caused by external impacts, thereby helping to ensure the reliability of the connection and seal between the tube 210 and the flexible support cylinder 100.

[0057] like Figure 1 As shown, the battery casing in this embodiment further includes an elastic buffer 400, which is disposed between the cover 220 and the electrode assembly 300. The elastic buffer 400 is used to absorb the axial expansion force of the electrode assembly. When the electrode assembly 300 expands and generates an axial force, it will directly compress the elastic buffer 400. At this time, the elastic buffer 400 absorbs the expansion force through its own elastic deformation, thus protecting the end cap 200. In specific implementation, the elastic buffer 400 is clamped between one end of the electrode assembly 300 and the corresponding cover 220 by the pre-tightening force of the end cap 200. The elastic buffer 400 is provided with a through hole for the electrode tab to pass through. The elastic buffer 400 can be a product with elasticity and expansion force absorption effect, such as a silicone pad.

[0058] When the pole assembly 300 expands axially, the axial compressive force acts on the elastic buffer 400, causing the elastic buffer 400 to be compressed, thereby absorbing the axial expansion force.

[0059] In one possible implementation, such as Figure 1 and Figure 2 As shown, the flexible support cylinder 100 in this embodiment has openings at both ends, and there are two end caps 200. The two end caps 200 are respectively connected to both ends of the flexible support cylinder 100 to seal the corresponding openings. Specifically, the tubes 210 of the two end caps 200 are inserted into both ends of the flexible support cylinder 100 and then heat-pressed together. The battery casing here is a three-section battery casing.

[0060] In another possible implementation, one end of the flexible support cylinder 100 has an opening, in which case there is one end cap 200. One end cap 200 is connected to both ends of the flexible support cylinder 100 to seal the corresponding openings. Specifically, the tube body 210 of the end cap 200 is inserted into the open end of the flexible support cylinder 100 and then heat-pressed together. The battery casing here is a two-section battery casing.

[0061] In one possible implementation, the cross-section of the tube 210 is adapted to the cross-section of the flexible support cylinder 100. This arrangement facilitates the connection and sealing of the tube 210 and the flexible support cylinder 100. Figure 1 As shown, the cross-section of the tube 210 and the cross-section of the flexible support cylinder 100 are both circular, and the battery casing is a cylindrical battery casing.

[0062] For example, the cover 220 can be rectangular or circular, and both the tube 210 and the flexible support cylinder 100 have circular cross-sections. The connection between the cover 220 and the tube 210 is smooth. It should be noted that the cross-sections of the tube 210 and the flexible support cylinder 100 can also be other shapes, such as rectangular or elliptical. In specific implementation, the shape can be determined according to the battery's usage requirements.

[0063] Furthermore, existing technologies with monolithic rigid casings suffer from significant efficiency losses at the system integration level. Neither cylindrical, prismatic, nor pouch cells can provide a stable and reliable direct assembly interface.

[0064] Specifically, for cylindrical batteries, due to their cylindrical casing, a large number of dispersed cylindrical batteries must be bound together into a single unit using complex metal clamping supports (such as end plates and side plates) to resist expansion and impact. Electrical connections between batteries require laser welding using independent metal busbars (such as nickel plates). This structure results in a large number of ineffective gaps between cylindrical batteries, causing the volume utilization rate of the battery module to typically be less than 65%, significantly limiting the system's energy density.

[0065] In this embodiment, the end cap 200 provides a flat and robust mechanical mounting surface. This allows the metal end cap 200 to be directly connected to the module frame, or the side of the metal end cap 200 can be directly used as a laser welding surface to be welded to the end cap 200 of adjacent batteries or module structural components. Therefore, in this embodiment, the cover body 220 of the metal end cap 200 directly serves as the assembly interface, eliminating the need for clamping brackets and busbar adapters required in traditional modules. This greatly simplifies the module structure, thereby reducing the number of parts and assembly steps, and consequently reducing manufacturing costs. It also helps eliminate a large amount of ineffective space in traditional assembly methods, improving the volume utilization rate of the module.

[0066] In one possible implementation, the battery casing of this application embodiment further includes an insulating protective layer disposed on the outer surface of the flexible support cylinder 100. By providing the insulating protective layer, the insulation and protection effect of the flexible support cylinder 100 is improved, thereby extending the service life of the flexible support cylinder 100.

[0067] In this embodiment, the insulating protective layer can be a polyurethane coating or a silicone coating. The insulating protective layer is coated onto the outer surface of the flexible support cylinder 100 to form a physical barrier, preventing short circuits caused by external punctures, thereby improving the structural reliability of the flexible support cylinder 100.

[0068] In practice, the thickness of the polyurethane or silicone coating can be determined according to the application requirements; for example, the coating thickness can be from 10μm to 50μm. Of course, the material and thickness of the coating can also be determined according to the application requirements.

[0069] The battery casing of this embodiment achieves functional integration through the collaborative design of a flexible support cylinder 100 and an end cap 200. The flexible support cylinder 100, serving as the energy storage body, is made of multi-layered aluminum-plastic film. During the charge-discharge cycles of the electrode assembly 300, the flexible support cylinder 100 adapts to the expansion changes of the electrode assembly 300 due to its flexibility. The end cap 200 is connected to the flexible support cylinder 100 via an interference fit and thermo-pressed connection, facilitating the formation of a closed cavity to accommodate the electrode assembly 300 and providing mechanical protection through structural strength. The end cap 200 can integrate terminals and explosion-proof valves to achieve electrical connection and overvoltage protection. The expansion characteristics of the flexible support cylinder 100 and the mechanical protection function of the end cap 200 work together to ensure that the battery maintains structural integrity and functionality under complex operating conditions.

[0070] Furthermore, through the cooperation of the flexible support cylinder 100 and the end cap 200, the end cap 200 can integrate the pole post and explosion-proof valve, directly serving as the assembly interface, eliminating the need for traditional busbars and clamping brackets, and improving the module-level volume utilization rate. In demanding scenarios such as electric vehicles and electric aviation, it facilitates the synergistic optimization of energy density, mechanical strength, and assembly efficiency.

[0071] This application provides a battery, including the battery casing as described in any of the above embodiments.

[0072] The battery in this embodiment can be a cylindrical battery or the like. By providing the battery casing as described above, the battery's lifespan and energy density can be improved.

[0073] This application provides a battery pack including the batteries described above. Specifically, the battery pack of this application can be configured with multiple batteries. By using the batteries described above, it achieves the same beneficial effects as the batteries described above, and will not be repeated here.

[0074] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0075] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. A battery casing, characterized in that, include: A flexible support cylinder (100) having an opening at at least one end; End cap (200), the end cap (200) is connected to the flexible support cylinder (100), the end cap (200) is used to seal the opening; A receiving cavity is formed between the flexible support cylinder (100) and the end cap (200) for accommodating the electrode assembly (300) of the battery. The flexible support cylinder (100) is configured to expand when the electrode assembly (300) expands.

2. The battery casing according to claim 1, characterized in that, The flexible support cylinder (100) is an aluminum-plastic film cylinder, which is formed by winding multiple layers of aluminum-plastic film.

3. The battery casing according to claim 2, characterized in that, The thickness d of the flexible support cylinder (100) satisfies: 85μm≤d≤230μm.

4. The battery casing according to any one of claims 1 to 3, characterized in that, The end cap (200) includes a tube (210) and a cover (220), the cover (220) being connected to one end of the tube (210), and the other end of the tube (210) being inserted into the flexible support cylinder (100).

5. The battery casing according to claim 4, characterized in that, The tube (210) is interference-fitted to the flexible support cylinder (100), and the tube (210) and the flexible support cylinder (100) are heat-pressed together.

6. The battery casing according to claim 4, characterized in that, The cross-section of the tube (210) is adapted to the cross-section of the flexible support cylinder (100); And / or, it also includes an elastic buffer (400) disposed between the cover (220) and the pole group (300), the elastic buffer (400) being used to absorb the axial expansion force of the pole group (300).

7. The battery casing according to any one of claims 1 to 3, characterized in that, The end cap (200) is any one of an aluminum alloy end cap, a copper alloy end cap, a copper end cap, or a nickel-plated steel end cap.

8. The battery casing according to any one of claims 1 to 3, characterized in that, It also includes an insulating protective layer disposed on the outer surface of the flexible support cylinder (100).

9. A battery, characterized in that, The battery casing includes any one of claims 1 to 8.

10. A battery pack, characterized in that, Includes the battery as described in claim 9.

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