Battery pack switch device, battery pack, and electric vehicle

Abstract

The utility model discloses a battery pack switch device for battery pack, and the battery pack has a battery box, and a through hole is arranged on the side wall of the battery box, and the battery pack switch device comprises: a pyrotechnic control switch; a device shell is provided with a containing cavity, and the containing cavity is used for containing the pyrotechnic control switch, the device shell is penetrated into the through hole from the outside of the side wall, so that the containing cavity is located in the inside of the battery box; a first sealing ring is fixed at the through hole and located between the device shell and the side wall of the battery box, and the device shell and the battery box are sealingly connected through the first sealing ring; a device front panel covers the opening of the containing cavity and is detachably connected with the device shell; a second sealing ring is fixed at the opening of the containing cavity and located between the device shell and the device front panel, and the device front panel is sealingly connected with the device shell through the second sealing ring. The above-mentioned battery pack switch device is convenient to replace and maintain. The utility model also discloses a battery pack and an electric automobile.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack switching device, a battery pack, and an electric vehicle. Background Technology

[0002] In the field of new energy vehicles, to address safety requirements such as battery disconnection protection in driving collision scenarios and current segmented disconnection protection during battery pack overload and short circuits, the mainstream solution currently used in the industry is the PyroSwitch, a smoke-type safety switch with a response disconnection time of up to two milliseconds. This type of switch is widely used in electric vehicles. Typically, the smoke switch is installed separately inside the battery pack or integrated with the Battery Energy Distribution Unit (BDU) within the battery pack. The working principle of this type of switch is as follows: upon receiving an external trigger signal, an internal explosive impact is generated, driving a mechanical rod to move, thereby quickly disconnecting the high-voltage copper busbar and achieving emergency power cut-off, thus ensuring the safety of the vehicle and passengers.

[0003] However, pyrotechnic switches have inherent limitations: after their detonation, the broken copper busbar cannot be repaired, requiring the entire pyrotechnic switch to be removed and replaced. Currently, in the new energy industry, battery packs developed for battery pack integration technologies (such as CTP (Cell to Pack); CTC (Cell to Chassis)) generally feature high integration, large amounts of adhesive, and high protection levels, making the replacement of pyrotechnic switches in these battery packs extremely difficult, or even impossible. Therefore, in practical applications, the difficulty or inability to replace pyrotechnic switches after activation often leads to inconvenient maintenance and affects the subsequent use of the battery pack. Utility Model Content

[0004] This invention proposes a battery pack switching device to solve the above-mentioned problems.

[0005] In a first aspect, embodiments of this utility model disclose a battery pack switch device for a battery pack. The battery pack has a battery housing, and a through hole is provided on the side wall of the battery housing. The battery pack switch device includes:

[0006] Fireworks control switch;

[0007] The device housing has a receiving cavity for accommodating the pyrotechnic control switch. The device housing has a perforation inserted through the outer side of the side wall so that the receiving cavity is located inside the battery box.

[0008] The first sealing ring is fixed at the perforation and is located between the side wall of the device housing and the battery box. The device housing and the battery box are sealed together by the first sealing ring.

[0009] The front panel of the device covers the opening of the receiving cavity and is detachably connected to the device housing;

[0010] The second sealing ring is fixed at the opening of the receiving cavity and is located between the device housing and the device front panel. The device front panel is sealed to the device housing through the second sealing ring.

[0011] Using the above technical solution, the battery pack switch device of this utility model is set on the side wall of the battery box. The fire control switch inside the device housing can be replaced and repaired by opening the front panel of the device. The operation is simple and convenient. Moreover, by setting the first sealing ring and the second sealing ring, the entire battery pack switch device can also be guaranteed to have extremely high sealing performance.

[0012] Optionally, the device housing, battery box, and first sealing ring are further sealed together by a combination of three hexagonal bolts.

[0013] Optionally, the front panel of the device, the device housing, and the second sealing ring are further sealed together by a three-piece pan head bolt system.

[0014] Optionally, it also includes:

[0015] The control signal interface is located on the outer surface of the device housing and is electrically connected to the pyrotechnic control switch. It inputs a control signal to the pyrotechnic control switch to detonate the pyrotechnic control switch.

[0016] The high-voltage output interface and the high-voltage input interface are located on the outer surface of the device housing, respectively on both sides of the control signal interface. There is a gap between the high-voltage output interface and the high-voltage input interface and the control signal interface, and they are electrically connected to the pyrotechnic control switch to connect the pyrotechnic control switch to the high-voltage circuit of the battery pack.

[0017] Optionally, the high-voltage output interface and the high-voltage input interface are electrically connected to the pyrotechnic control switch via copper busbars and bolts.

[0018] Optionally, the device housing also includes:

[0019] The top shell, which is stepped, includes:

[0020] The first step includes a first tread surface and a first riser surface, and the first riser surface is provided with a first through hole;

[0021] The second step is connected below the first step and includes a second tread and a second riser. The second tread is connected to the first riser. The second tread is provided with a plurality of downwardly recessed interface receiving grooves, which accommodate high-voltage output interfaces and high-voltage input interfaces.

[0022] The control signal interface can pass through the first through hole from the inside of the device housing and is located on the outer surface of the second tread.

[0023] Optionally, it also includes:

[0024] The rear protective cover of the device is detachably connected to the device housing and forms an accommodating space with the outer surface of the top shell of the device housing. The high-voltage output interface, high-voltage input interface and control signal interface are all located within the accommodating space.

[0025] Optionally, the device housing is also provided with multiple exhaust ports to release smoke after the pyrotechnic control switch is detonated.

[0026] Secondly, embodiments of this utility model disclose a battery pack, including the battery pack switching device described in any of the first aspects above, wherein the battery pack contains battery cells or battery modules.

[0027] Using the above technical solution, in the battery pack of this utility model, the battery pack switch device is set on the side wall of the battery box. The fire control switch inside the device housing can be replaced and repaired by opening the front panel of the device. The operation is simple and convenient. Moreover, by setting the first sealing ring and the second sealing ring, the entire battery pack switch device can also be guaranteed to have extremely high sealing performance.

[0028] Thirdly, embodiments of this utility model disclose an electric vehicle, including the battery pack described in the second aspect.

[0029] Using the above technical solution, in the electric vehicle of this utility model, the battery pack switch device is set on the side wall of the battery box. The fire control switch inside the device housing can be replaced and repaired by opening the front panel of the device. The operation is simple and convenient. Moreover, by setting the first sealing ring and the second sealing ring, the entire battery pack switch device can also be guaranteed to have extremely high sealing performance. Attached Figure Description

[0030] Figure 1 This diagram shows a structural schematic of the battery pack switch device and the side wall of the battery box in an embodiment of the present invention.

[0031] Figure 2 This diagram illustrates the three-dimensional structure of the battery pack switch device in an embodiment of the present invention. Figure 1 ;

[0032] Figure 3 This diagram illustrates the three-dimensional structure of the battery pack switch device in an embodiment of the present invention. Figure 2 ;

[0033] Figure 4 This diagram illustrates the three-dimensional structure of the battery pack switch device in an embodiment of the present invention. Figure 3 ;

[0034] Figure 5 An exploded view of the battery pack switching device in an embodiment of this utility model is shown.

[0035] Figure label:

[0036] 1. Battery box cover; 2. Battery box; 3. First sealing ring; 4. Device housing; 5. Device front panel; 6. Device front panel fixing bolt; 7. Device fixing bolt; 8. Device rear protective cover; 9. High voltage input interface; 10. High voltage output interface; 11. Control signal interface; 12. Second sealing ring; 13. Switch fixing bolt; 14. Control wiring harness; 15. Fireworks control switch; 16. Copper busbar; 17. Low voltage connector slot; 18. Exhaust hole; 41. First tread; 42. First kick surface; 43. Second tread; 44. Second kick surface. Detailed Implementation

[0037] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0038] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0040] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0041] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0042] Firstly, reference Figure 1 and combined Figure 5 The present invention discloses a battery pack switch device for a battery pack. The battery pack has a battery housing 2, and the side wall of the battery housing 2 is provided with a through hole. The battery pack switch device includes a pyrotechnic control switch 15, a device housing 4, a first sealing ring 3, a device front panel 5, and a second sealing ring 12.

[0043] The device housing 4 has a receiving cavity for accommodating the pyrotechnic control switch 15. The device housing 4 is inserted through a perforation on its outer side wall so that the receiving cavity is located inside the battery box 2. The core function of the pyrotechnic control switch 15 is to receive a trigger signal and then cut off the high-voltage circuit through an internal explosion impact. Its overall size is adapted to the receiving cavity of the device housing 4, allowing it to be directly placed inside. A first sealing ring 3 is fixed at the perforation, located between the side walls of the device housing 4 and the battery box 2, sealing the device housing 4 and the battery box 2 together. The front panel 5 covers the opening of the receiving cavity and is detachably connected to the device housing 4. A second sealing ring 12 is fixed at the opening of the receiving cavity, located between the device housing 4 and the front panel 5, sealing the front panel 5 to the device housing 4 together.

[0044] Using the above technical solution, the battery pack switch device of this utility model is set on the side wall of the battery box 2. By opening the front panel 5 of the device, the pyrotechnic control switch 15 inside the device housing 4 can be replaced and repaired. The operation is simple and convenient. Furthermore, by setting the first sealing ring 3 and the second sealing ring 12, the entire battery pack switch device can also be guaranteed to have extremely high sealing performance.

[0045] For example, the first sealing ring 3 is a foam sealing ring, and the second sealing ring 12 is an O-ring.

[0046] In the above embodiments, the pyrotechnic control switch 15 is placed inside the device housing 4 and fixed, and the device housing 4 is then fixed to the battery box 2 of the battery pack. The battery box 2 can be made of metal. The device housing 4 is sealed to the battery box 2 of the battery pack by compression through the first sealing ring 3 (e.g., a foamed silicone sealing ring). At the same time, the front panel 5 of the device has an external window, and is sealed by the cooperation of the second sealing ring 12 (e.g., an O-ring) with the front panel 5 of the device. The front panel 5 of the device can be fixed to the front flange surface of the device housing 4.

[0047] With this configuration, the overall sealing performance of the battery pack switching device reaches an IP67 level or higher, ensuring high sealing performance. IP67 is a specific level in the internationally recognized Ingress Protection Rating standard, established by the International Electrotechnical Commission (IEC) (standard number: IEC 60529), to define the protective capabilities of electrical equipment enclosures against the intrusion of solid foreign objects and liquids. Furthermore, the front panel 5 of the device features a separately removable maintenance window, allowing for convenient maintenance and replacement of the pyrotechnic control switch 15 without disassembling the battery pack and battery housing cover 1.

[0048] Furthermore, in the above embodiments, reference is made to... Figures 1-2 and combined Figure 5 The device housing 4, battery box 2, and first sealing ring 3 are further sealed together by device fixing bolts 7. Specifically, the device fixing bolts 7 are, for example, three-unit hexagonal bolts. Specifically, the first sealing ring 3 is adhered to the rear flange surface at the front end of the device housing 4. Threaded holes are provided at the four corners of the front end of the device housing 4, and the three-unit hexagonal bolts pass through these threaded holes to securely seal the first sealing ring 3, the device housing 4, and the battery box 2.

[0049] This design avoids relative displacement between the device housing 4 and the battery box 2, preventing the first sealing ring 3 from loosening due to vibration and causing sealing failure. At the same time, the three-combination structure of the three-combination hexagonal bolts (i.e., the combination of bolt, flat washer and spring washer) can further prevent the bolts from loosening, ensuring long-term reliability. It also makes it easy to tighten with a wrench, which can improve assembly efficiency.

[0050] Furthermore, in the above embodiments, reference is made to... Figure 5 The front panel 5, the housing 4, and the second sealing ring 12 are further sealed together by the front panel fixing bolts 6. Specifically, the front panel fixing bolts 6 are, for example, three-piece pan head bolts. The second sealing ring 12 is pre-installed in the groove of the front flange face at the front end of the housing 4. Threaded holes are provided at the four corners of the front panel 5. The front panel fixing bolts 6 pass through these threaded holes to securely connect the front panel 5, the housing 4, and the second sealing ring 12, thus achieving a seal.

[0051] This design, with its three-panel head structure, avoids damage to operators or surrounding components caused by protruding bolt heads. Furthermore, the use of three-panel head bolts allows for easy assembly and disassembly of the front panel 5 with just a screwdriver, eliminating the need for specialized tools and further reducing the difficulty of replacing the pyrotechnic control switch 15. In addition, the use of bolts for fastening ensures the stability and sealing of the connection between the front panel 5, the housing 4, and the second sealing ring 12, contributing to a safe working environment for the pyrotechnic control switch 15.

[0052] Furthermore, in the above embodiments, the battery pack switching device further includes a control signal interface 11, a high-voltage output interface 10, and a high-voltage input interface 9. The control signal interface 11 is located on the outer surface of the device housing 4 and is electrically connected to the pyrotechnic control switch 15, inputting a control signal to the pyrotechnic control switch 15 to ignite it. The high-voltage output interface 10 and the high-voltage input interface 9 are located on the outer surface of the device housing 4, respectively on both sides of the control signal interface 11. There is a gap between the high-voltage output interface 10 and the high-voltage input interface 9 and the control signal interface 11, and they are electrically connected to the pyrotechnic control switch 15 to electrically connect the pyrotechnic control switch 15 to the high-voltage circuit of the battery pack. The battery pack contains both a high-voltage circuit and a low-voltage circuit; the control signal interface 11 belongs to the low-voltage circuit.

[0053] With this configuration, the control signal interface 11 can achieve physical isolation between the high-voltage output interface 10 and the high-voltage input interface 9 located on its two sides, respectively, ensuring high-voltage safety, avoiding interference between high-voltage signals and low-voltage control signals, and effectively preventing the pyrotechnics control switch 15 from being accidentally triggered or not triggered. At the same time, multiple interfaces are concentrated on the outer surface of the device housing 4, which facilitates quick plugging and unplugging of connectors during later maintenance without disassembling the internal structure of the device, thus helping to improve maintenance efficiency.

[0054] Furthermore, in the above embodiments, reference is made to... Figure 3 , Figure 4 and Figure 5 The high-voltage output interface 10 and the high-voltage input interface 9 are electrically connected to the pyrotechnic control switch 15 via a copper busbar 16 and bolts (i.e., switch fixing bolts 13).

[0055] Compared to traditional wire connections, the copper busbar 16 has lower DC resistance and higher current carrying capacity, meeting the transmission requirements of hundreds of volts and hundreds of amps of current in battery packs, and reducing power transmission losses. Furthermore, the rigid structure of the copper busbar 16 prevents connection loosening caused by vehicle vibrations. Combined with the switch fixing bolts 13, it achieves a more reliable and robust connection, helping to ensure long-term stable conduction of the high-voltage circuit and reducing the risk of high-voltage arcing.

[0056] Specifically, the pyrotechnic control switch 15 is supported by two copper busbars 16 and then fixed with two switch fixing bolts 13 (e.g., three-piece combination bolts) to achieve a reliable electrical connection.

[0057] Furthermore, in the above embodiments, reference is made to... Figure 3 , Figure 4 and Figure 5 The device housing 4 also includes a top housing. The top housing is stepped, including a first step and a second step. The first step includes a first tread surface 41 and a first kick surface 42, with a first through hole on the first kick surface 42. The second step is connected below the first step and includes a second tread surface 43 and a second kick surface 44. The second tread surface 43 is connected to the first kick surface 42, and the second tread surface 43 has multiple downwardly recessed interface receiving grooves that accommodate the high-voltage output interface 10 and the high-voltage input interface 9. Specifically, a portion of each of the two copper busbars 16 (specifically, high-voltage copper busbars) is pre-installed inside the device housing 4, and another portion of each of the two copper busbars 16 protrudes from the device housing 4 and is set in a slot (i.e., an interface receiving groove) on the device housing 4 for pre-fixing and limiting. The high-voltage output interface 10 and the high-voltage input interface 9 can be set in the interface receiving groove and electrically connected to the copper busbars 16.

[0058] The control signal interface 11 passes through the first through hole from inside the device housing 4 and is located on the outer surface of the second tread surface 43. The interface receiving slot also includes a low-voltage connector slot 17, and the control signal interface 11 is specifically located inside the low-voltage connector slot 17. Furthermore, the control signal interface 11 is electrically connected to the pyrotechnic control switch 15 via a control wiring harness 14. Specifically, the connector at one end of the control wiring harness 14 is interlocked with the pyrotechnic control switch 15, and the connector at the other end of the control wiring harness 14 is the control signal interface 11. The control wiring harness 14 passes through the first through hole from inside the device housing 4, allowing the control signal interface 11 connected to the control wiring harness 14 to be located within the low-voltage connector slot 17 on the outer surface of the second tread surface 43.

[0059] This configuration, with the control signal interface 11, high-voltage output interface 10, and high-voltage input interface 9 located in different interface receiving slots, effectively avoids mutual interference among them. Simultaneously, the interface receiving slot design allows the high-voltage output interface 10 and high-voltage input interface 9 to be embedded into the device housing 4, reducing the protrusion height of the interfaces and facilitating their protection. Furthermore, the first through-hole also serves to limit the movement of the control wiring harness 14, preventing wear due to vibration and improving the reliability of low-voltage control signal transmission.

[0060] Furthermore, in the above embodiments, the pyrotechnic control switch 15 can be removed simply by unscrewing the switch fixing bolt 13 and disconnecting the connector on the control harness 14 that connects to the pyrotechnic control switch 15, making maintenance and replacement of the pyrotechnic control switch 15 convenient.

[0061] Furthermore, in the above embodiments, reference is made to... Figure 3 , Figure 4 and Figure 5 The battery pack switching device also includes a rear protective cover 8. The rear protective cover 8 is detachably connected to the device housing 4, forming an accommodating space with the outer surface of the top housing of the device housing 4. The high-voltage output interface 10, the high-voltage input interface 9, and the control signal interface 11 are all located within this accommodating space. This arrangement allows the rear protective cover 8 to cover the high-voltage output interface 10, the high-voltage input interface 9, and the control signal interface 11, effectively preventing external dust, moisture, and foreign objects from impacting the interfaces, thus protecting them. Combined with the arrangement of the control signal interface 11, the high-voltage output interface 10, and the high-voltage input interface 9 in the aforementioned embodiments, it further achieves high-voltage isolation. Simultaneously, the detachable design of the rear protective cover 8 facilitates the maintenance of these multiple interfaces, balancing protection and ease of operation.

[0062] For example, the rear protective cover 8 of the device and the housing 4 of the device can be detachably connected by a snap-fit ​​connection.

[0063] Furthermore, in the above embodiments, the rear protective cover 8, the device housing 4, and the front panel of the device are all integrally injection molded from high-temperature resistant and flame-retardant engineering plastics.

[0064] Furthermore, in the above embodiments, reference is made to... Figure 3 The device housing 4 is also equipped with multiple exhaust holes 18 to release smoke after the pyrotechnic control switch 15 is detonated. This design facilitates timely smoke release when the pyrotechnic control switch 15 is activated, and also allows for heat dissipation and ventilation, reducing the negative impact of smoke on the battery pack switching device and improving the overall reliability of the device.

[0065] Secondly, embodiments of this utility model disclose a battery pack, including the battery pack switching device described in any of the first aspects above, wherein the battery pack contains battery cells or battery modules.

[0066] Using the above technical solution, in the battery pack of this utility model, the battery pack switch device is set on the side wall of the battery box. The fire control switch inside the device housing can be replaced and repaired by opening the front panel of the device. The operation is simple and convenient. Moreover, by setting the first sealing ring and the second sealing ring, the entire battery pack switch device can also be guaranteed to have extremely high sealing performance.

[0067] Thirdly, embodiments of this utility model disclose an electric vehicle, including the battery pack described in the second aspect.

[0068] Using the above technical solution, in the electric vehicle of this utility model, the battery pack switch device is set on the side wall of the battery box. The fire control switch inside the device housing can be replaced and repaired by opening the front panel of the device. The operation is simple and convenient. Moreover, by setting the first sealing ring and the second sealing ring, the entire battery pack switch device can also be guaranteed to have extremely high sealing performance.

[0069] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A battery pack switching device for a battery pack, characterized in that, The battery pack has a battery housing, and the side wall of the battery housing has a through hole. The battery pack switching device includes: Fireworks control switch; The device housing has a receiving cavity for accommodating the pyrotechnic control switch. The device housing is inserted into the perforation from the outer side of the side wall so that the receiving cavity is located inside the battery box. The first sealing ring is fixed at the through hole and is located between the side wall of the device housing and the battery box. The device housing and the battery box are sealed together by the first sealing ring. The front panel of the device covers the opening of the receiving cavity and is detachably connected to the device housing; The second sealing ring is fixed at the opening of the receiving cavity and is located between the device housing and the device front panel. The device front panel is sealed to the device housing through the second sealing ring.

2. The battery pack switching device as described in claim 1, characterized in that, The device housing, the battery box, and the first sealing ring are further sealed together by a combination of three hexagonal bolts.

3. The battery pack switching device as described in claim 1, characterized in that, The front panel of the device, the device housing, and the second sealing ring are further sealed together by a three-piece pan head bolt system.

4. The battery pack switching device as described in claim 1, characterized in that, Also includes: A control signal interface is located on the outer surface of the device housing and is electrically connected to the pyrotechnic control switch. It inputs a control signal to the pyrotechnic control switch to detonate the pyrotechnic control switch. A high-voltage output interface and a high-voltage input interface are located on the outer surface of the device housing, respectively on both sides of the control signal interface. There is a gap between the high-voltage output interface and the high-voltage input interface and the control signal interface, and they are electrically connected to the pyrotechnic control switch to connect the pyrotechnic control switch to the high-voltage circuit of the battery pack.

5. The battery pack switching device as described in claim 4, characterized in that, The high-voltage output interface and the high-voltage input interface are electrically connected to the pyrotechnics control switch via copper busbars and bolts.

6. The battery pack switching device as described in claim 4, characterized in that, The device housing also includes: The top shell, which is stepped, includes: The first step includes a first tread surface and a first riser surface, wherein a first through hole is provided on the first riser surface; The second step is connected below the first step and includes a second tread and a second kick surface. The second tread is connected to the first kick surface. The second tread is provided with a plurality of downwardly recessed interface receiving grooves, which accommodate the high-voltage output interface and the high-voltage input interface. The control signal interface can pass through the first through hole from inside the device housing and is located on the outer surface of the second tread.

7. The battery pack switching device as described in claim 6, characterized in that, Also includes: The rear protective cover of the device is detachably connected to the device housing and forms an accommodating space with the outer surface of the top housing of the device housing. The high-voltage output interface, the high-voltage input interface and the control signal interface are all located within the accommodating space.

8. The battery pack switching device as described in claim 1, characterized in that, The device housing is also provided with multiple exhaust holes, which release smoke after the pyrotechnic control switch is detonated.

9. A battery pack, characterized in that, Includes the battery pack switching device as described in any one of claims 1-8, wherein the battery pack contains battery cells or battery modules.

10. An electric vehicle, characterized in that, Includes the battery pack as described in claim 9.

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