Battery pack and electric device

Abstract

The utility model provides a battery pack and a power utilization device, and the battery pack comprises a battery box body in which a battery cell module is placed, a BDU arranged on the outer side wall of the battery box body, and an adapter arranged on the outer side wall of the battery box body, the BDU is connected with the high-voltage electrical component and / or the battery cell module in the battery box body through the high-voltage wiring assembly on the adapter seat, and the BDU is connected with the low-voltage electrical component in the battery box body through the low-voltage wiring assembly on the adapter seat. According to the battery pack, the use number of parts can be reduced, the switching design is reduced, the integration level of the whole pack is improved, the cost reduction design of the whole pack is realized, the probability of sealing failure when the battery pack wades into water can be reduced, the sealing performance of the battery pack is improved, meanwhile, the BDU is maintained without electrification, the operation safety is high, and the service life of the battery pack is prolonged. The whole package of electrical components is good in maintainability, and after-sales maintenance cost can be reduced, so that the quality of the whole package can be improved, and after-sales work can be carried out.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pack technical field, especially a kind of battery pack, simultaneously, the utility model also relates to a kind of electric device. BACKGROUND

[0002] Battery pack is the energy source of new energy vehicle, mainly provides large current to motor controller, drive motor, air conditioning system, vehicle-mounted charging system and other electric equipment, to ensure the normal driving of new energy vehicle.BDU (Battery Distribution Unit, battery distribution unit) is mainly responsible for the distribution and management of battery pack electric energy, is set between battery pack and electric equipment, is usually placed in battery pack, and the electric energy of battery pack is distributed to different electric equipment under control, is the important protection module of new energy vehicle high-voltage circuit system.

[0003] Current battery pack box is usually provided with multiple high-voltage connector sockets and low-voltage connector sockets, and the BDU is plugged with each connector socket through the plug connected with high-low voltage wire harness, to realize the connection of battery pack and electric equipment, the connection wire harness is more, the scheme is complex, the cost is relatively high, and it is easy to malfunction, and when any component in the BDU fails and needs to be repaired and replaced, the battery pack also needs to be disassembled, which is inconvenient for maintenance, the after-sales cost is high, and it is not conducive to the improvement of battery pack quality and the development of after-sales service. UTILITY MODEL CONTENT

[0004] Therefore, the utility model aims at providing a battery pack, which is beneficial to the improvement of the whole package quality and the reduction of after-sales cost.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] A battery pack, comprising a battery box body in which a cell module is placed, a BDU provided on the outer side wall of the battery box body, and an adapter seat provided on the outer side wall of the battery box body.

[0007] The BDU is connected with the high-voltage electrical components in the battery box body and / or the cell module through the high-voltage wiring assembly on the adapter seat, and the BDU is connected with the low-voltage electrical components in the battery box body through the low-voltage wiring assembly on the adapter seat.

[0008] Further, the high-voltage wiring assembly comprises a plurality of first high-voltage terminals, at least one of which is connected to the total positive output point of the cell module, and at least one of which is connected to the total negative output point of the cell module; the low-voltage wiring assembly comprises a low-voltage terminal, which is connected with the BMS slave board and high-voltage interlock wire harness in the low-voltage electrical components.

[0009] Further, the high-voltage wiring assembly comprises a plurality of second high-voltage wiring posts, at least one of the second high-voltage wiring posts is connected to the rear-drive high-voltage socket in the high-voltage electrical component, and / or at least one of the second high-voltage wiring posts is connected to the fast-charging high-voltage socket in the high-voltage electrical component.

[0010] Further, the high-voltage wiring assembly comprises a plurality of second high-voltage wiring posts, at least one of the second high-voltage wiring posts is connected to the rear-drive high-voltage socket in the high-voltage electrical component, and / or at least one of the second high-voltage wiring posts is connected to the fast-charging high-voltage socket in the high-voltage electrical component.

[0011] Further, the BDU is provided with a conductive seat connected to the adapter socket, and a high-voltage conductive assembly and a low-voltage conductive assembly are arranged on the conductive seat, the high-voltage conductive assembly is connected to the high-voltage wiring assembly, and the low-voltage conductive assembly is connected to the low-voltage wiring assembly.

[0012] Further, the BDU comprises a shell, an electrical assembly arranged in the shell, and a maintenance cover plate detachably arranged at the bottom of the shell, and the conductive seat is arranged on the side wall of the shell.

[0013] Further, the electrical assembly comprises a BMS master control board, a main fuse, a main positive contactor, a main negative contactor, a pre-charging relay, a pre-charging resistor and an electrical auxiliary fuse.

[0014] Further, the BDU comprises a high-voltage output assembly and a low-voltage output assembly connected to the electrical assembly through the shell, the high-voltage output assembly is used for being connected to an on-board charging module and a DC / DC module, and the low-voltage output assembly is used for being connected to a whole vehicle end.

[0015] Further, the shell and the battery box body are detachably connected, and / or a through groove is arranged on the outer side wall of the battery box body, and the adapter socket is arranged in the through groove.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The battery pack, through the adapter seat, realizes connection of the BDU and high-voltage electrical components, cell modules and low-voltage electrical components in the battery box, can reduce the use quantity of high-voltage wiring harnesses, low-voltage wiring harnesses, high-voltage connectors and low-voltage connectors and the like, reduces the adapter design, is beneficial to improving the integration of the whole pack, and realizes the whole pack cost-reducing design, and the reduction of the quantity of wiring harnesses and connectors and the like can also reduce the number of holes on the battery box, reduces the probability of sealing failure of the battery pack when wading, is beneficial to improving the sealing property of the battery pack, meanwhile, the BDU is arranged outside the battery box, and the BDU can be maintained only by disassembling the BDU, the non-live working safety is high, the whole pack electrical components are good in maintainability, and the after-sales maintenance cost is reduced, thereby, the whole pack quality can be improved and the after-sales work can be carried out.

[0018] Moreover, the high-voltage wiring assembly comprises a first high-voltage wiring column connected with a total positive output point of the cell module and a first high-voltage wiring column connected with a total negative output point of the cell module, and the low-voltage wiring assembly comprises a low-voltage wiring column connected with a BMS slave board and a high-voltage interlock wiring harness in the low-voltage electrical component, and is beneficial to realizing the purpose of reducing complex wiring work, so that the whole adapter seat has better integration.

[0019] Secondly, the conductive seat is connected with the adapter seat in a plug-in connection mode, so that the BDU can be quickly installed and disassembled, and an operator only needs to align and plug in the conductive seat and the adapter seat to complete the connection of the BDU and the adapter seat, thereby simplifying the assembly process, reducing the installation time and improving the production efficiency. The BDU is integrated with various electrical components in the shell, can be suitable for different high-voltage architecture requirements in cooperation with the adapter seat, and improves the application range of the BDU.

[0020] Another purpose of the utility model is to provide a power utilization device, wherein the battery pack is arranged.

[0021] Compared with the same beneficial effect in the prior art, the battery pack and the power utilization device are not described here. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings that form a part of the present utility model are used to provide a further understanding of the present utility model, and the illustrative embodiments of the present utility model and the description thereof are used to explain the present utility model, and do not constitute an improper limitation on the present utility model. In the drawings:

[0023] Figure 1 The structure schematic view of the battery pack described in the utility model embodiment is shown in the figure;

[0024] Figure 2 And Figure 3 The structure schematic view of the adapter seat described in the utility model embodiment is shown in the figure;

[0025] Figure 4 A structure schematic view of the BDU according to the embodiment of the present application is shown in the figure;

[0026] Figure 5 A structure schematic view of the electrically conductive seat according to the embodiment of the present application is shown in the figure;

[0027] Figure 6 A structure schematic view of the maintenance cover plate according to the embodiment of the present application is shown in the figure;

[0028] Figure 7 A structure schematic view of the inside of the BDU according to the embodiment of the present application is shown in the figure;

[0029] Figure 8 A structure schematic view of the electrical assembly according to the embodiment of the present application is shown in the figure;

[0030] Explanation of reference signs:

[0031] 1, battery box; 101, through groove;

[0032] 2, BDU; 201, electrically conductive seat; 2011, high-voltage electrically conductive assembly; 2012, low-voltage electrically conductive assembly; 202, shell;

[0033] 203, electrical assembly; 2031, BMS main control board; 2032, main fuse; 2033, pre-charge relay; 2034, pre-charge resistor; 2035, electric auxiliary fuse;

[0034] 204, maintenance cover plate; 205, high-voltage output assembly; 206, low-voltage output assembly;

[0035] 3, adapter seat; 301, high-voltage wiring assembly; 302, low-voltage wiring assembly. DETAILED DESCRIPTION

[0036] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0037] In the following description, specific details are set forth in order to provide a thorough understanding of the embodiments of the present application. However, persons skilled in the art should understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary details.

[0038] In the description of the utility model, it is necessary to explain that if the terms indicating the orientation or position relationship such as ''up'', ''down'', ''inner'', ''outer'' appear, it is based on the orientation or position relationship shown in the drawing, and it is only for the convenience of describing the utility model and simplifying the description, and therefore it cannot be understood as the limitation of the utility model. In addition, if the terms such as ''first'' and ''second'' appear, they are also only for the description purpose, and cannot be understood as indicating or implying relative importance.

[0039] In addition, in the description of the utility model, unless otherwise explicitly limited, the terms ''installation'', ''connection'', ''connection'', ''connector'' should be understood broadly. For example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through intermediate medium, and it can be the communication inside two elements. For ordinary skilled person in the art, the specific meaning of the above terms in the utility model can be understood in combination with specific circumstances.

[0040] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0041] Embodiment one

[0042] The embodiment relates to a battery pack, and as shown in the whole structure, Figures 1 to 8 The battery pack of the embodiment comprises a battery box 1 in which a battery cell module is placed, a BDU 2 arranged on the outer side wall of the battery box 1, and an adapter seat 3 arranged on the outer side wall of the battery box 1. The BDU 2 is connected with high-voltage electrical components and / or the battery cell module in the battery box 1 through a high-voltage wiring assembly 301 on the adapter seat 3, and the BDU 2 is connected with low-voltage electrical components in the battery box 1 through a low-voltage wiring assembly 302 on the adapter seat 3.

[0043] At this time, as arranged above, by arranging the BDU 2 on the outer side wall of the battery box 1 and using the adapter seat 3 to realize high-low voltage connection, the space occupation in the battery box can be reduced, the layout of the whole battery pack is more compact, and the overall integration of the battery pack can be improved. Specifically, by realizing the connection of the BDU with the high-voltage electrical components, the battery cell module and the low-voltage electrical components in the battery box through the adapter seat 3, the number of parts such as high-voltage wiring harness, low-voltage wiring harness, high-voltage connector and low-voltage connector can be reduced, the adapter design can be reduced, the overall integration of the battery pack can be improved, the failure rate can be reduced, the reliability and safety of the adapter seat 3 can be ensured, the production cost of the battery pack can be reduced, more available space can be released for other electrical components or the capacity of the battery cell module can be increased, and the space utilization rate can be improved.

[0044] Moreover, the connection by the adapter 3 can reduce the number of wire harnesses, and thus the number of openings on the battery box 1, effectively reducing the probability of damage to the electrical components inside the battery box by external factors such as moisture and dust, and reducing the probability of seal failure when the battery pack is submerged in water, thereby improving the reliability of the entire pack waterproofing and prolonging the service life of the entire pack. At the same time, based on the BDU 2 being arranged outside the battery box 1, when a problem occurs in the electrical components inside the BDU 2, the BDU 2 can be repaired or replaced without disassembling the entire battery pack, simplifying the maintenance process, saving time and cost, and being safe for non-live work, and the electrical components of the entire pack are easy to maintain, thereby facilitating the improvement of the quality of the entire pack and reducing the after-sales cost.

[0045] In this embodiment, as a preferred implementation form, referring to Figure 2 As shown in the figure, the high-voltage wiring assembly 301 includes a plurality of first high-voltage wiring posts, at least one of which is connected to the total positive output point of the cell module, and at least one of which is connected to the total negative output point of the cell module. The low-voltage wiring assembly 302 includes a low-voltage wiring post connected to the BMS (Battery Management System; battery management system) slave board and high-voltage interlock wire harness in the low-voltage electrical components.

[0046] Here, the design of the first high-voltage wiring post and the low-voltage wiring post can ensure that the current path is more explicit and reliable, and each wiring post has its specific function. By explicitly specifying the function of the wiring post, electrical faults such as short circuits caused by misoperation can be avoided. Moreover, separating the high-voltage and low-voltage lines can avoid interference between them, and also facilitate the purpose of reducing complex wiring work, making the entire adapter have better integration.

[0047] It can be understood that, in this embodiment, as a preferred implementation form, referring to Figure 2 As shown in the figure, the high-voltage wiring assembly 301 includes a plurality of second high-voltage wiring posts, at least one of which is connected to the rear-drive high-voltage socket in the high-voltage electrical components, and at least one of which is connected to the fast-charging high-voltage socket in the high-voltage electrical components.

[0048] In specific implementation, the second high-voltage terminal can be connected with the rear-drive high-voltage socket to supply power to the rear-drive motor, and can also be connected with the fast-charging high-voltage socket to perform fast charging on the battery module. In addition, based on the building requirements of the electrical architecture, the second high-voltage terminal can be connected with only the rear-drive high-voltage socket or only the fast-charging high-voltage socket. Secondly, since the supply of power to the rear-drive motor and the fast charging of the battery pack cannot be performed at the same time, the second high-voltage terminal can be connected with both the rear-drive high-voltage socket and the fast-charging high-voltage socket at the same time, thereby reducing the requirement for additional interfaces and wiring space, and improving the space utilization rate of the battery pack.

[0049] It should be noted that the related structure parts not mentioned in the battery pack of the present embodiment can refer to the battery pack products well known to those skilled in the art, such as the connection between the rear-drive high-voltage socket and the rear-drive motor, and the connection between the fast-charging high-voltage socket and the battery cell module, which will not be described here.

[0050] At the same time, in the present embodiment, the high-voltage wiring assembly 301 includes a plurality of second high-voltage terminals. In addition to being connected with the rear-drive high-voltage socket and the fast-charging high-voltage socket, the second high-voltage terminals are connected with the positive output point and the negative output point of the battery cell module 1 / 2, as shown in Figure 2 As a preferred implementation form, at least one of the second high-voltage terminals is connected with the positive output point of the battery cell module 1 / 2, and at least one of the second high-voltage terminals is connected with the negative output point of the battery cell module 1 / 2.

[0051] Therefore, it is beneficial to build different high-voltage architectures. For example, the other ends of the two second high-voltage terminals are connected with the main fuse 2032 in the BDU 2. The battery cell module in the battery pack is connected in series with the main fuse 2032. When a short circuit occurs, the main fuse 2032 will quickly cut off the circuit when the current abnormally increases, preventing the short-circuit current from causing serious damage to the battery module and other electrical components.

[0052] In addition, since the above-mentioned at least two second high-voltage terminals are connected with the positive output point and the negative output point of the battery cell module 1 / 2, the battery cell module can be divided into two parts, and the main fuse 2032 is located at the connection point between the two parts. Whether the front half of the battery cell module or the rear half of the battery cell module is short-circuited, the main fuse 2032 can detect abnormal current and quickly cut off the circuit. At this time, the protection range of the main fuse 2032 is the widest.

[0053] In addition, in the present embodiment, as a preferred implementation form, referring to Figure 2As shown, the BDU 2 has a conductive seat 201 plugged with the adapter 3, and a high-voltage conductive assembly 2011 and a low-voltage conductive assembly 2012 are arranged on the conductive seat 201. The high-voltage conductive assembly 2011 is connected with the high-voltage wiring assembly 301, and the low-voltage conductive assembly 2012 is connected with the low-voltage wiring assembly 302.

[0054] The conductive seat 201 and the adapter 3 are connected by plugging, so that the BDU 2 can be quickly installed and removed. The operator only needs to align and insert the conductive seat 201 with the adapter 3 to complete the connection of the BDU 2 and the adapter 3, simplifying the assembly process, reducing the installation time, and improving the production efficiency.

[0055] The high-voltage wiring assembly 301 connected with the BDU 2 on the adapter 3 has high-voltage electricity. In order to consider the safety of the operator, the high-voltage wiring assembly 301 is preferably designed as a female end (the high-voltage conductive assembly 2011 on the conductive seat 201 is preferably designed as a male end) and is designed to prevent hand touch (IPXXB) to prevent the operator from being electrocuted when installing the BDU 2.

[0056] In this embodiment, as a preferred implementation form, refer to Figure 2 As shown, the BDU 2 includes a shell 202, an electrical assembly 203 arranged in the shell 202, and a maintenance cover plate 204 detachably arranged at the bottom of the shell 202, and the conductive seat 201 is arranged on the side wall of the shell 202.

[0057] The maintenance cover plate 204 is detachably arranged at the bottom of the shell 202 of the BDU 2. This design allows the maintenance personnel to easily open the maintenance cover plate 204 to directly check the electrical components inside the BDU 2, especially the easily damaged main fuse 2032. Without the need to completely disassemble the entire BDU 2, the maintenance time is reduced. After opening the maintenance cover plate 204, the maintenance personnel can quickly locate and handle the fault point, thereby significantly improving the maintenance efficiency, simplifying the maintenance process, and ensuring the normal operation of the BDU 2 in the shortest time, reducing the inconvenience caused by long downtime.

[0058] In detail, in this embodiment, as a preferred implementation form, refer to

[0059] In detail, in this embodiment, as a preferred implementation form, refer to Figure 2As shown, the electrical components 203 include a BMS master board 2031, a main fuse 2032, a main positive contactor, a main negative contactor, a pre-charge relay 2033, a pre-charge resistor 2034, and an electrical accessory fuse 2035.

[0060] The BDU2 is integrated with various electrical components in the housing 202, and can be adapted to different high-voltage architecture requirements in cooperation with the adapter 3, has strong compatibility, and is conducive to meeting the requirements of different vehicle models and different application scenarios, and improving the multifunctionality of the system.

[0061] It is worth mentioning that the relevant structural parts and functional parts not mentioned in the BDU2 of the embodiment can be referred to the power distribution box products known to those skilled in the art, for example, the BMS master board 2031 is used for monitoring and managing the battery pack state, the main fuse 2032 is used for short-circuit protection of the battery pack, the main positive contactor and the main negative contactor have important roles in controlling current, improving safety, and protecting the battery pack in the BDU2, the pre-charge relay 2033 and the pre-charge resistor 2034 are used for limiting peak current and protecting high-voltage circuits and related components, and the electrical accessory fuse 2035 can provide additional overload protection, such as ODP (powertrain development project) fuses to improve the application range of the BDU2. Among them, the ODP fuse refers to the fuse device in the ODP integrated vehicle-mounted power management module, and the ODP integrated vehicle-mounted power management module is an integrated product mainly including OBC (on-board charger), DC / DC converter, and PDU (power distribution unit) and the like.

[0062] In addition, in the embodiment, in order to facilitate the connection of the BDU2 with the vehicle end, as a preferred implementation form, with reference to Figure 2 As shown, the BDU2 includes a high-voltage output component 205 and a low-voltage output component 206 connected with the electrical components 203 through the housing 202, the high-voltage output component 205 is used for connecting with the on-board charging module and the DC (Direct Current; direct current) / DC module, and the low-voltage output component 206 is used for connecting with the vehicle end. Among them, the low-voltage output component 206 includes a low-voltage interface and an ODP interface, both of which are connected with the vehicle end, for example, the ODP interface is connected with the PDU (Power Distribution Unit; power distribution unit).

[0063] Moreover, in the embodiment, as a preferred implementation form, with reference to Figure 2As shown, the shell 202 and the battery box 1 are detachably connected to facilitate the disassembly convenience of the BDU 2. In particular implementation, a plurality of through holes can be provided on the shell 202, and screws are screwed on the battery box 1 through the through holes to connect the BDU 2 and the battery box 1 together, so as to ensure the connection stability between the BDU 2 and the battery box 1, and also make the plug-in of the conductive seat 201 on the BDU 2 and the adapter seat 3 more stable.

[0064] Based on the above design, if the BMS mainboard or the contactor and other components fail, the BDU 2 can be disassembled from the battery box 1 for repair and replacement, which is safe for live working, and the battery pack electrical components are good in maintainability, greatly reducing the after-sales maintenance cost. In this way, the shell 202 and the battery box 1 of the embodiment can be detachably connected, which can cooperate with the maintenance cover to effectively improve the maintenance convenience of the BDU 2.

[0065] In the embodiment, as a preferred implementation form, the outer side wall of the battery box 1 is provided with a through groove 101, and the adapter seat 3 is arranged in the through groove 101. The adapter seat 3 is embedded in the through groove 101, which can better fix the adapter seat 3 and save space. At the same time, a sealing member can be arranged between the adapter seat 3 and the through groove 101 as necessary to achieve better sealing effect of the battery box 1, preventing moisture, dust and other external pollutants from entering the inside of the battery box 1.

[0066] Embodiment two

[0067] The embodiment relates to an electric device, which is configured with the battery pack in the embodiment one. In particular implementation, the electric device can be an electric vehicle or a hybrid vehicle.

[0068] The electric device of the embodiment can reduce the use of wire harnesses and connectors in the electrical architecture based on the use of the battery pack in the embodiment one, which not only saves production cost, but also has lower failure rate, facilitates the maintenance and replacement of the BDU 2, and is beneficial to improving the product quality and use experience of the device.

[0069] The above only describes the preferred embodiments of the utility model, and does not limit the utility model. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1.A battery pack, characterized in that: a battery box in which a battery cell module is placed, a BDU provided on an outer side wall of the battery box, and an adapter provided on the outer side wall of the battery box; the BDU is connected to high-voltage electrical components in the battery box and / or the battery cell module through high-voltage wiring assemblies on the adapter, and the BDU is connected to low-voltage electrical components in the battery box through low-voltage wiring assemblies on the adapter; the high-voltage wiring assemblies include a plurality of first high-voltage wiring posts, at least one of which is connected to a total positive output point of the battery cell module, and at least one of which is connected to a total negative output point of the battery cell module; the low-voltage wiring assemblies include a low-voltage wiring post connected to a BMS slave board and a high-voltage interlock wire harness in the low-voltage electrical components; the BDU has a conductive seat for plugging into the adapter, and high-voltage and low-voltage conductive assemblies are provided on the conductive seat, the high-voltage conductive assemblies are connected to the high-voltage wiring assemblies, and the low-voltage conductive assemblies are connected to the low-voltage wiring assemblies. 2.The battery pack of claim 1, characterized in that: the high-voltage wiring assemblies include a plurality of second high-voltage wiring posts, at least one of which is connected to a rear-drive high-voltage socket in the high-voltage electrical components, and / or at least one of which is connected to a fast-charging high-voltage socket in the high-voltage electrical components. 3.The battery pack of claim 1, characterized in that: the high-voltage wiring assemblies include a plurality of second high-voltage wiring posts, at least one of which is connected to a positive output point at 1 / 2 of the battery cell module, and at least one of which is connected to a negative output point at 1 / 2 of the battery cell module. 4.The battery pack of claim 1, characterized in that: the BDU includes a shell, electrical assemblies provided in the shell, and a maintenance cover plate detachably provided at the bottom of the shell, and the conductive seat is provided on the side wall of the shell. 5.The battery pack of claim 4, characterized in that: the electrical assemblies include a BMS master control board, a main fuse, a main positive contactor, a main negative contactor, a pre-charge relay, a pre-charge resistor, and an electrical auxiliary fuse. 6.The battery pack of claim 4, characterized in that: the BDU includes high-voltage output assemblies and low-voltage output assemblies connected to the electrical assemblies through the shell, the high-voltage output assemblies are used to connect to an on-board charging module and a DC / DC module, and the low-voltage output assemblies are used to connect to a vehicle end. 7.The battery pack of any one of claims 4 to 6, characterized in that: the shell and the battery box are detachably connected; and / or a through groove is provided on the outer side wall of the battery box, and the adapter is provided in the through groove. 8.A power utilization device, characterized in that: the power utilization device is configured with the battery pack of any one of claims 1 to 7.

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