Battery pack box and battery pack

Abstract

This application relates to a battery pack housing and a battery pack. The battery pack includes a battery and a battery pack housing. The battery pack housing includes a top cover, a housing body, and a sealing element. The top cover fits onto the housing body and forms a receiving cavity with the housing body. The battery is disposed within the receiving cavity, and the cavity wall is covered with an insulating layer. The top cover has a conductive first contact surface near the housing body, and the housing body has a conductive second contact surface near the top cover. The first and second contact surfaces are in contact to form a conductive electrical circuit between the top cover and the housing body. The first and / or second contact surfaces have mounting grooves surrounding the receiving cavity, and the sealing element is embedded in the mounting grooves. This design ensures direct surface contact between the top cover and the housing body, providing a prerequisite for large-area conductivity between them, while also ensuring that the contact positions of the top cover and the housing body and the sealing element do not interfere with each other spatially, thus maintaining a good sealing effect between the top cover and the housing body.

Description

Technical Field

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

[0002] With the acceleration of aviation electrification, electric aircraft, represented by electric vertical takeoff and landing (eVTOL), are being used in more and more scenarios. As a key component of electric aircraft, the power battery pack provides power for the flight of electric aircraft.

[0003] In related technologies, a power battery pack includes the battery pack housing and the batteries and other components installed inside. Besides providing typical mechanical protection to prevent battery damage, the battery pack housing also plays a crucial role in preventing external electromagnetic interference and protecting the battery from electromagnetic waves generated by the battery itself from interfering with other parts of the aircraft. Therefore, the design of the battery pack housing must consider the critical indicator of EMC (Electromagnetic Compatibility). EMC, as one of the most important indicators of product quality, is of great significance to the safety protection of the battery. Unlike power batteries used in new energy vehicles, power batteries used in the aerospace field have much higher requirements for EMC electromagnetic shielding. Traditional power batteries used in new energy vehicles often struggle to simultaneously meet the requirements of aerospace EMC electromagnetic shielding and the sealing requirements for the batteries and other components inside the battery pack housing. Utility Model Content

[0004] Based on this, the purpose of this application is to provide a battery pack housing and a battery pack including the battery pack housing, so as to solve the problem that the design of the battery pack housing of the power battery used in traditional new energy vehicles is difficult to meet both the requirements of aviation EMC electromagnetic shielding and the sealing requirements of the battery and other components inside the battery pack housing.

[0005] According to one aspect of this application, a battery pack housing is provided, including a top cover, a housing body and a sealing element, wherein one end of the housing body has an opening, the top cover is disposed at the opening and closes the opening, and one side surface of the housing body and one side surface of the top cover form a receiving cavity, the cavity wall being covered with an insulating layer made of insulating material.

[0006] The top cover has a first conductive contact surface at one end near the box body, and the box body has a second conductive contact surface at one end near the top cover. The first contact surface and the second contact surface are in contact with each other so that the top cover and the box body form a conductive electrical circuit. The first contact surface and / or the second contact surface are provided with a mounting groove surrounding the receiving cavity. The sealing element is embedded in the mounting groove and surrounds the receiving cavity.

[0007] In one embodiment, the top cover forms a first cavity, and the box body forms a second cavity, wherein the first cavity and the second cavity are interconnected and together form the receiving cavity.

[0008] In one embodiment, the top cover has a first flange at one end near the box body, and the box body has a second flange at one end near the top cover. The first flange and the second flange are respectively arranged around the receiving cavity. The surface of the first flange near the box body is the first contact surface, and the surface of the second flange near the top cover is the second contact surface.

[0009] In one embodiment, the top cover is locked to the box body by fasteners that pass through the first flange and the second flange.

[0010] In one embodiment, the mounting groove is formed on the first contact surface and / or the second contact surface near the edge of the receiving cavity and communicates with the receiving cavity.

[0011] In one embodiment, the top cover and the box body are made of metal.

[0012] In one embodiment, the top cover and the box body are castings or sheet metal stampings.

[0013] In one embodiment, the top cover and the box body are composite stamping parts, the composite stamping parts have an outer side and an inner side disposed opposite to the outer side, and the composite stamping parts include multiple layers stacked along their own thickness direction;

[0014] Of all the plies, one ply is the insulating layer, and the other ply is a conductive layer made of a conductive material. The insulating layer is disposed on the inner side and forms the cavity wall of the receiving cavity. The conductive layer extends from the inside of the composite stamping and is turned outward to the inner side to form the first contact surface or the second contact surface.

[0015] In one embodiment, the insulating layer is made of glass fiber or aramid fiber; the conductive layer is made of copper or nickel-plated carbon fiber.

[0016] According to another aspect of this application, a battery pack is provided, including a battery and a battery pack housing as described in any of the above embodiments, wherein the battery is disposed within the battery pack housing.

[0017] The aforementioned battery pack housing and battery pack, by having the first contact surface of the upper cover and the second contact surface of the housing body in contact with each other, form a sealed receiving cavity between the upper cover and the housing body. Furthermore, the upper cover and the housing body can form a conductive electrical circuit through a large area of ​​surface contact. Simultaneously, an insulating layer covers the cavity wall, enabling the battery pack housing to achieve an effective Faraday cage effect. This effectively isolates electromagnetic interference from the inside and outside of the battery pack housing, thus providing electrostatic shielding and better meeting the requirements for aerospace-grade EMC electromagnetic shielding. Further, by having the first contact surface and / or... A mounting groove surrounding the receiving cavity is provided on the second contact surface, and the sealing element is embedded in the mounting groove, so that a stepped configuration is formed on the first contact surface and / or the second contact surface. In this way, when the top cover is closed on the box body, it can ensure that the first contact surface and the second contact surface are in contact with each other, so that the top cover and the box body can achieve direct surface contact, providing the prerequisite for large-area conduction between the top cover and the box body. At the same time, it ensures that the contact position between the top cover and the box body and the sealing element do not interfere with each other in space, so as not to damage the seal between the top cover and the box body, and thus ensure that the top cover and the box body maintain a good sealing effect. Attached Figure Description

[0018] Figure 1 This is an exploded view of a battery pack provided in one embodiment of this application.

[0019] Figure 2 This is a cross-sectional view of the connection between the top cover and the main body of the battery pack in an embodiment of this application.

[0020] Figure 3 This is an exploded view of a battery pack provided in an improved embodiment of this application.

[0021] Figure 4 This is a cross-sectional view of the connection between the top cover and the main body of the battery pack in an improved embodiment of this application (the main body is a casting).

[0022] Figure 5 This is a schematic diagram of the structure of the battery pack housing body (the housing body is a stamped part) provided in an improved embodiment of this application.

[0023] Figure 6 This is a cross-sectional view of the connection between the top cover and the main body of the battery pack in an improved embodiment of this application (the main body is a stamped part).

[0024] Figure 7This is a schematic diagram of the internal structure of the top cover of the battery pack provided in an improved embodiment of this application (the top cover is a composite stamping part).

[0025] Figure 8 This is a schematic diagram of the internal structure of the battery pack housing body (the housing body is a composite stamping part) provided in an improved embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10. Battery pack; 100. Battery pack housing; 101. Receiving cavity; 110. Top cover; 110a. Outer side; 110b. Inner side; 111. First cavity; 112. First flange; 1121. First contact surface; 113. Lamination; 1131. Insulating layer; 1132. Conductive layer; 120. Housing body; 121. Second cavity; 122. Second flange; 1221. Second contact surface; 1222. Mounting groove; 1223. Fastening hole; 130. Seal; 140. Fastener; 200. Battery. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms 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, and 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.

[0030] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0034] This application provides a battery pack housing and a battery pack. The battery pack includes a battery pack housing and a battery. The battery is disposed inside the battery pack and is used to provide power to various electrical devices so that the electrical devices can work normally.

[0035] The following description uses the battery pack for electric aircraft as an example to illustrate the structure of the battery pack and its housing. It is understood that in other embodiments, the battery pack of this application is not limited to use in electric aircraft, but can also be used in electric vehicles, electric bicycles, and other transportation vehicles and any electrical equipment; therefore, no limitation is made here.

[0036] See Figure 1 , Figure 1An exploded view of a battery pack 10 provided in an embodiment of this application is shown. The battery pack 10 provided in an embodiment of this application includes a battery pack housing 100 and a battery 200. The battery pack housing 100 encloses a closed receiving cavity 101, and the battery 200 is disposed within the receiving cavity 101. The battery pack housing 100 includes a top cover 110, a housing body 120, and a sealing member 130. One end of the housing body 120 has an opening, and the top cover 110 is disposed at the opening and closes the opening. The receiving cavity 101 is formed by one side surface of the housing body 120 and one side surface of the top cover 110. The sealing member 130 is disposed around the receiving cavity 101 between the connection position of the top cover 110 and the housing body 120, and is used to seal the connection gap between the top cover 110 and the housing body 120. Exemplarily, the sealing member 130 can be made of a material that can undergo elastic deformation, such as silicone or sealing foam.

[0037] As mentioned in the background, in addition to the usual mechanical protection to prevent damage to the battery 200, the battery pack housing 100 also has an important function of shielding against electromagnetic interference. This is to prevent the battery 200 from being affected by external electromagnetic interference and to prevent the electromagnetic waves generated by the battery 200 itself from interfering with other parts of the aircraft. Therefore, the battery pack housing 100 must take into account the key indicator of EMC (electromagnetic compatibility) during its design.

[0038] Specifically, such as Figure 2 As shown, Figure 2 A cross-sectional view is shown at the connection point between the top cover 110 and the main body 120 of the battery pack housing 100 in one embodiment. Figure 2 In the embodiment shown, both the top cover 110 and the box body 120 have an opening at one end. The top cover 110 forms a first cavity 111, and the box body 120 forms a second cavity 121. The top cover 110 and the box body 120 are locked together by fasteners such as bolts 140, so that the first cavity 111 and the second cavity 121 are interconnected and together form a receiving cavity 101.

[0039] More specifically, in one embodiment, the top cover 110 has a first flange 112 at the end near the box body 120, and the box body 120 has a second flange 122 at the end near the top cover 110. The first flange 112 and the second flange 122 are respectively arranged around the receiving cavity 101. The side surface of the first flange 112 near the box body 120 forms a first contact surface 1121, and the side surface of the second flange 122 near the top cover 110 forms a second contact surface 1221. A sealing member 130 is disposed between the first contact surface 1121 and the second contact surface 1221, with its opposite sides respectively attached to the first contact surface 1121 and the second contact surface 1221, so that the top cover 110 and the box body 120 are sealed through the sealing member 130. Fasteners 140 are sequentially inserted through the first flange 112, the sealing member 130, and the second flange 122, so that the sealing member 130 is fixed between the top cover 110 and the box body 120.

[0040] To achieve electromagnetic shielding, the top cover 110 and the main body 120 must be made of conductive materials, such as metal or composite materials with a metal layer. The cavity wall of the receiving cavity 101 is covered with an insulating layer made of insulating material, so that both the first contact surface 1121 and the second contact surface 1221 are conductive. After the top cover 110 and the main body 120 are connected, the top cover 110 and the main body 120 form a conductive electrical circuit through the fastener 140. The top cover 110 and the main body 120 form a sealed receiving cavity 101. Through the principle of electrostatic shielding, the external electric field is redistributed on the outer surface of the battery pack housing 100, thereby neutralizing the electric field inside the battery pack housing 100. This protects the battery 200 inside the battery pack housing 100 from electromagnetic interference, or protects the external components of the battery pack housing 100 from electromagnetic waves emitted by the battery 200 itself. This phenomenon is called the Faraday cage effect.

[0041] However, it is worth noting that, unlike the power battery 200 used in new energy vehicles, the power battery 200 used in the aviation field has higher requirements for EMC electromagnetic shielding. The power battery 200 used in traditional new energy vehicles is difficult to simultaneously meet the electromagnetic shielding requirements of the aviation field, the sealing requirements of the battery pack housing 100, and the lightweight requirements of the aviation field in the design of the battery pack 10.

[0042] For example, for Figure 2In this embodiment, the seal 130 is disposed between the first contact surface 1121 and the second contact surface 1221, so that the upper cover 110 and the box body 120 are separated by the seal 130. Therefore, the upper cover 110 and the box body 120 are not in direct contact. Since the seal 130 itself is not conductive, the upper cover 110 and the box body 120 cannot achieve large-area electrical conduction. Furthermore, since the conductivity of the composite material itself is low, it cannot meet the requirements of aerospace-grade electromagnetic shielding. If the materials of the upper cover 110 and the box body 120 are lightweight composite materials, the electromagnetic shielding effect will be poor. Even if the materials of the upper cover 110 and the box body 120 are metal materials with good conductivity, the high density of the metal material itself will have a significant impact on the lightweight design in the aerospace field.

[0043] Therefore, in order to address the aforementioned issues of meeting the high electromagnetic shielding requirements of the aerospace industry, the lightweight design requirements of the battery pack 10, and the sealing requirements of the battery pack housing 100, the applicant of this application, after research, has... Figure 2 The embodiments described herein have been improved. See also Figure 3 and Figure 4 , Figure 3 This is an exploded view of the battery pack housing 100 of the improved embodiment. Figure 4 This is a cross-sectional view of the connection point between the upper cover 110 and the body 120 of the battery pack housing 100 in the improved embodiment. Figure 2 The embodiment shown differs in that, in this embodiment, the second contact surface 1221 has a mounting groove 1222 surrounding the receiving cavity 101, so that the second contact surface 1221 forms a stepped configuration. The sealing member 130 is embedded in the mounting groove 1222 and is arranged around the mounting groove 1222, for the fastener 140 to pass through the fastening hole 1223 at the stepped platform position in the stepped configuration.

[0044] Thus, after the above improvements, when the top cover 110 is placed on the box body 120, it ensures that the first contact surface 1121 and the second contact surface 1221 are in contact with each other, allowing the top cover 110 and the box body 120 to have direct surface contact, providing the prerequisite for large-area conduction between the top cover 110 and the box body 120. At the same time, it ensures that the contact position between the top cover 110 and the box body 120 and the sealing element 130 do not interfere with each other in space, thereby not damaging the seal between the top cover 110 and the box body 120, and thus ensuring that the top cover 110 and the box body 120 maintain a good sealing effect.

[0045] As one implementation method, such as Figure 3 and Figure 4As shown, the mounting groove 1222 is formed on the housing body 120, specifically at the edge of the second contact surface 1221 near the receiving cavity 101, so that the mounting groove 1222 and the receiving cavity 101 are in communication. It can be understood that the mounting groove 1222 can be formed at any position on the second contact surface 1221, for example, it can also be formed at the edge of the second contact surface 1221 away from the receiving cavity 101, or along the edge of the second contact surface 1221. Figure 4 The middle position in the horizontal direction is not specifically defined.

[0046] It is also understood that the mounting groove 1222 can also be formed on the top cover 110, that is, on the first contact surface 1121. Alternatively, the mounting groove 1222 can be formed on both the first contact surface 1121 and the second contact surface 1221, with the mounting groove 1222 on the first contact surface 1121 and the mounting groove 1222 on the second contact surface 1221 communicating with each other. As long as it can ensure that the top cover 110 and the box body 120 achieve direct surface contact, and that the contact position between the top cover 110 and the box body 120 and the seal 130 do not interfere with each other in space, there are no restrictions on this.

[0047] Regarding the materials of the top cover 110 and the box body 120, the materials of the top cover 110 and the box body 120 can be metal or composite materials. When the materials of the top cover 110 and the box body 120 are metal, the top cover 110 and the box body 120 can be castings or sheet metal stampings. For example Figure 3 and Figure 4 As shown, Figure 3 and Figure 4 The box body 120 shown is a casting; as Figure 5 and Figure 6 As shown, Figure 5 and Figure 6 The box body 120 shown is a sheet metal stamping part. Of course, the material of the top cover 110 and the box body 120 can also be a composite stamping part made of composite materials. For example, when the box body 120 is a composite stamping part, the structure of the box body 120 can also be the structure shown in the figure.

[0048] Specifically, please refer to Figure 7 and Figure 8 , Figure 7 The internal structure of the upper cover 110 when it is a composite stamped part is shown. Figure 8 The internal structure of the box body 120 when it is a composite stamped part is shown. Figure 7As can be seen, the composite stamping part has an outer side 110a and an inner side 110b opposite to the outer side 110a, and the composite stamping part includes multiple layers 113 stacked along their own thickness direction; in order to achieve insulation inside the battery pack housing 100, and in order to form a conductive electrical circuit when the top cover 110 and the housing body 120 are in contact with each other, one layer 113 is an insulating layer 1131, and another layer 113 is a conductive layer 1132 made of conductive material. From Figure 7 and Figure 8 As can be seen, the insulating layer 1131 is disposed on the inner side 110b and forms the cavity wall of the receiving cavity 101, for example... Figure 7 In the upper cover 110, the bottommost layer 113 forms the cavity wall of the receiving cavity 101. Figure 8 In the housing body 120, the topmost layer 113 forms the cavity wall of the receiving cavity 101. As for the conductive layer 1132, most of it is embedded inside the composite stamping part, while a portion extends and bends outward from the interior of the composite stamping part to the inner side 110b to form a first contact surface 1121 or a second contact surface 1221, thereby ensuring a large contact area between the top cover 110 and the housing body 120. For example... Figure 7 As shown, the composite stamping part is a top cover 110, and the conductive layer 1132, which is turned outward to the inner side 110b of the composite stamping part, forms a first contact surface 1121; as Figure 8 As shown, the composite stamping part is the upper cover 110, and the conductive layer 1132 turned outward to the inner side 110b of the composite stamping part forms the second contact surface 1221.

[0049] More specifically, in a preferred embodiment, the insulating layer 1131 can be made of high-dielectric-strength glass fiber or aramid fiber, thereby ensuring high insulation performance of the inner side 110b of the top cover 110 or the box body 120; the conductive layer 1132 can be made of high-conductivity copper or nickel-plated carbon fiber, thereby ensuring that the top cover 110 and the box body 120 have a good electromagnetic shielding foundation. Of course, the insulating layer 1131 can also be made of other high-dielectric-strength materials, and the conductive layer 1132 can also be made of other high-conductivity materials, which are not limited here. As for the materials of other layers 113, there is no limitation on conductivity; for example, it can be carbon fiber, or of course, it can be glass fiber or aramid fiber, etc., which are also not limited here.

[0050] Therefore, it can be seen that the improved battery pack housing 100, when the upper cover 110 and the housing body 120 are made of metal, can meet both the electromagnetic shielding requirements in the aviation field and the sealing requirements of the battery pack housing 100. When the upper cover 110 and the housing body 120 are made of composite materials, in addition to meeting the electromagnetic shielding requirements in the aviation field and the sealing requirements of the battery pack housing 100, it can also meet the lightweight design requirements of the battery pack 10 in the aviation field. Thus, the problem of making the battery pack 10 lightweight, meeting the aviation-grade electromagnetic shielding requirements, and meeting the sealing requirements of the battery pack housing 100 is solved.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery pack housing, characterized in that, The container includes a top cover, a box body, and a sealing element. One end of the box body has an opening, and the top cover is disposed at the opening and closes the opening. One side surface of the box body and one side surface of the top cover form a receiving cavity, and the cavity wall is covered with an insulating layer made of insulating material. The top cover has a first conductive contact surface at one end near the box body, and the box body has a second conductive contact surface at one end near the top cover. The first contact surface and the second contact surface are in contact with each other so that the top cover and the box body form a conductive electrical circuit. The first contact surface and / or the second contact surface are provided with a mounting groove surrounding the receiving cavity. The sealing element is embedded in the mounting groove and surrounds the receiving cavity.

2. The battery pack housing according to claim 1, characterized in that, The top cover forms a first cavity, and the box body forms a second cavity. The first cavity and the second cavity are interconnected and together form the receiving cavity.

3. The battery pack housing according to claim 1, characterized in that, The top cover has a first flange at one end near the box body, and the box body has a second flange at one end near the top cover. The first flange and the second flange are respectively arranged around the receiving cavity. The surface of the first flange near the box body is the first contact surface, and the surface of the second flange near the top cover is the second contact surface.

4. The battery pack housing according to claim 3, characterized in that, The top cover is locked to the box body by fasteners, which pass through the first flange and the second flange.

5. The battery pack housing according to claim 1, characterized in that, The mounting groove is formed on the first contact surface and / or the second contact surface near the edge of the receiving cavity and communicates with the receiving cavity.

6. The battery pack housing according to any one of claims 1-5, characterized in that, The top cover and the box body are made of metal.

7. The battery pack housing according to claim 6, characterized in that, The top cover and the box body are castings or sheet metal stampings.

8. The battery pack housing according to any one of claims 1-5, characterized in that, The top cover and the box body are composite stamping parts made of composite materials. The composite stamping part has an outer side and an inner side opposite to the outer side, and the composite stamping part includes multiple layers stacked along its own thickness direction. Of all the plies, one ply is the insulating layer, and the other ply is a conductive layer made of a conductive material. The insulating layer is disposed on the inner side and forms the cavity wall of the receiving cavity. The conductive layer extends from the inside of the composite stamping and is turned outward to the inner side to form the first contact surface or the second contact surface.

9. The battery pack housing according to claim 8, characterized in that, The insulating layer is made of glass fiber or aramid fiber; the conductive layer is made of copper or nickel-plated carbon fiber.

10. A battery pack, characterized in that, It includes a battery and a battery pack housing as described in any one of claims 1-9, wherein the battery is disposed within the battery pack housing.

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