High-voltage box and battery pack

Abstract

The utility model provides a high-voltage box and a battery pack. The high-voltage box comprises a first shell; the second shell and the first shell are connected and define a containing cavity, and a contactor is arranged in the containing cavity; each of the first shell and the second shell comprises an inner plate and an outer plate which are stacked, and the inner plates and the outer plates are connected and encircled to form a sound insulation cavity so as to block noise generated by closing and opening of the contactor; according to the high-voltage box provided by the invention, the noise generated by the contactor can be weakened by utilizing the sound insulation cavity, so that the noise transmission efficiency is reduced, the noise intensity is reduced, and the product quality of the battery pack is improved.

Description

Technical Field

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

[0002] The BDU (Battery Disconnect Unit) is one of the key components of the battery pack. During actual operation, the contactor inside the BDU high-voltage box generates significant noise when it engages or disengages. This noise is transmitted to the external environment through the casing, forming perceptible noise pollution and affecting the NVH (Noise, Vibration and Harshness) performance and product quality of the battery pack. Utility Model Content

[0003] In view of this, the present application aims to provide a high-voltage box and battery pack to solve some or all of the above-mentioned technical problems.

[0004] To achieve the above objectives, a first aspect of this application provides a high-voltage box and a battery pack, comprising:

[0005] First shell;

[0006] The second housing is connected to the first housing and surrounds it to form a receiving cavity, and a contactor is provided in the receiving cavity;

[0007] Both the first housing and the second housing include a stacked inner plate and an outer plate. The inner plate and the outer plate are connected and enclose to form a sound insulation cavity to block the noise generated by the contactor engaging and disengaging.

[0008] A second aspect of this application also provides a battery pack, comprising:

[0009] The high-voltage box as described in the first aspect;

[0010] Box; and

[0011] Multiple battery modules are disposed within the housing, including the high-voltage box and the multiple battery modules.

[0012] As can be seen from the above, the high-voltage box and battery pack provided in this application include a first shell and a second shell of the high-voltage box, both of which include a stacked outer plate and an inner plate. The inner plate and the outer plate are connected to each other and enclose a sound insulation cavity. When the contactor in the high-voltage box is engaged or disengaged, the noise generated is transmitted to the sound insulation cavity through the inner plate. The sound insulation cavity can reduce the transmission efficiency of noise and weaken its intensity transmitted to the external environment, thereby reducing the impact of noise on the external environment and improving the product quality of the battery pack. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is an exploded view of the high-voltage box in an embodiment of this application;

[0015] Figure 2 This is a schematic diagram illustrating the first possible positional relationship between the inner and outer panels in an embodiment of this application.

[0016] Figure 3 This is a schematic diagram illustrating a second positional relationship between the inner and outer panels in an embodiment of this application.

[0017] Figure 4 This is a schematic diagram illustrating the third positional relationship between the inner and outer panels in an embodiment of this application.

[0018] Figure 5 This is a schematic diagram of the honeycomb panel structure in an embodiment of this application;

[0019] Figure 6 This is a schematic diagram of a first connection between the first housing and the second housing in an embodiment of this application;

[0020] Figure 7 This is a partial enlarged view of the high-voltage box in an embodiment of this application;

[0021] Figure 8 This is a schematic diagram of a second connection between the first housing and the second housing in an embodiment of this application;

[0022] Figure 9 This is a schematic diagram of a third connection between the first housing and the second housing in an embodiment of this application;

[0023] Figure 10 This is a schematic diagram of a fourth connection between the first housing and the second housing in an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures:

[0025] 101. First shell; 102. Second shell; 103. Receiving cavity; 110. Inner panel; 120. Outer panel; 121. Sound absorption cavity; 122. Honeycomb structure; 130. Sound insulation cavity; 131. Sound insulation layer;

[0026] 201. Connecting arm; 2011. Snap-fit ​​window; 202. Protrusion; 2021. Guide slope; 210. First step; 220. Second step. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0028] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] Battery packs, as crucial energy storage devices, are widely used in emerging fields such as new energy vehicles. Specifically, a battery pack typically includes a housing, battery modules and a battery distribution unit (BDU) located within the housing, and a cooling system integrated into the housing. The housing serves as the main load-bearing structure, the BDU centrally manages the charging, discharging, energy distribution, and circuit protection of the battery pack, and the cooling system dissipates heat from the battery pack to ensure stable operation. For electric vehicles, to increase the battery pack's capacity, it is usually integrated into the vehicle's chassis. However, during power supply or de-energization, the contactors inside the BDU generate noise due to their engagement and disengagement. This noise, when transmitted to the external environment, can create noticeable noise pollution, affecting the battery pack's NVH performance and overall product quality.

[0030] In some embodiments, to reduce the noise transmission efficiency of the BDU, a noise reduction structure can be added to the high-voltage box of the BDU to improve the noise reduction capability of the BDU. For example, adding a sealed sound insulation cotton structure inside the high-voltage box can effectively block the noise generated by the contactor. However, since the sound insulation cotton also has good heat insulation properties, it will reduce the heat dissipation capability of the BDU while reducing noise, which is not conducive to controlling its operating temperature.

[0031] For example, sound-absorbing cotton can be filled into the through holes and other locations of the high-voltage box to improve its sealing performance. Although improving the sealing performance of the high-voltage box can enhance its sound insulation effect, the improvement in noise reduction effect in actual application is limited, and the noise reduction capability is still relatively weak.

[0032] For example, a buffer pad can be added between the BDU high-voltage box and the battery pack housing to reduce noise transmission. Although the buffer pad can improve the noise suppression effect, in actual applications, the compression rate and rebound parameters of the buffer pad need to be calculated in advance for different specifications of BDU, which increases the complexity of the battery pack. In addition, multiple specifications of buffer pads will increase the difficulty of material management and may introduce assembly errors that affect the assembly accuracy of the battery pack.

[0033] In summary, there is an urgent need for a high-voltage box that has excellent sound insulation, a simple structure, and does not affect the heat dissipation performance of the BDU.

[0034] This application provides a high-voltage box for use in battery packs, combined with Figures 1-10 The content shown provides a detailed description of the high-voltage box.

[0035] A high-voltage box includes a first housing 101 and a second housing 102. The first housing 101 and the second housing 102 are connected and enclosed to form a receiving cavity 103. A contactor is provided in the receiving cavity 103. Both the first housing 101 and the second housing 102 include a stacked inner plate 110 and an outer plate 120. The inner plate 110 and the outer plate 120 are connected and enclosed to form a sound insulation cavity 130 to block the noise generated by the contactor engaging and disengaging.

[0036] Specifically, such as Figures 1-2 As shown, Figure 1 This is an exploded view of the high-voltage box in an embodiment of this application. Figure 2 This is a schematic diagram illustrating a first positional relationship between the inner plate 110 and the outer plate 120 in an embodiment of this application. Both the first housing 101 and the second housing 102 have cavity structures. During the assembly of the high-voltage box, the connection between the first housing 101 and the second housing 102 allows the two cavity structures to enclose and form a closed receiving cavity 103, providing integrated installation space for electrical components such as contactors.

[0037] Furthermore, such as Figure 2 As shown, the first housing 101 and the second housing 102 of the high-voltage box both include a stacked inner plate 110 and an outer plate 120. For the first housing 101 or the second housing 102, the inner plate 110 and the outer plate 120 can be connected to form a sound insulation cavity 130 to block contactor noise. When the contactor engages or disengages in the receiving cavity 103, the noise is transmitted outward through the inner plate 110, the sound insulation cavity 130 and the outer plate 120 in sequence. Since there is a difference in acoustic impedance between the sound insulation cavity 130 and the inner plate 110 and the outer plate 120, the noise transmitted into the sound insulation cavity 130 will undergo multiple reflections, scattering and resonance consumption, thereby weakening the noise transmission efficiency and reducing the intensity of noise transmitted to the external environment, thus achieving effective noise blocking.

[0038] Furthermore, for the first housing 101 and the second housing 102, on the one hand, setting the sound insulation cavity 130 between the inner plate 110 and the outer plate 120 simplifies the complexity of the first housing 101 and the second housing 102, which helps to reduce the manufacturing cost of the high-voltage box; on the other hand, the presence of the sound insulation cavity 130 has little impact on the heat dissipation performance of the high-voltage box, ensuring the heat dissipation requirements of the BDU, that is, achieving the noise reduction function while also taking into account the balance between cost control and heat dissipation performance.

[0039] In some embodiments, the outer panel 120 is recessed on the side facing the receiving cavity 103 to form a plurality of sound-absorbing cavities 121. For example... Figure 4 As shown, Figure 4 This is a schematic diagram of the third positional relationship between the inner plate 110 and the outer plate 120 in this embodiment of the application. When the contactor in the receiving cavity 103 generates noise and transmits it to the sound insulation cavity 130 through the inner plate 110, since the outer plate 120 is provided with multiple sound-absorbing cavities 121 on the side facing the receiving cavity 103, the noise is further attenuated after entering or being reflected into the sound-absorbing cavity 121 through multiple reflections and resonances, so as to further reduce the noise intensity and weaken the noise level transmitted to the external environment.

[0040] For example, the sound-absorbing cavity 121 can be designed as a columnar, frustum-shaped, or conical structure; wherein, adopting a frustum-shaped or conical sound-absorbing cavity 121 can not only effectively improve the noise reduction effect, but also maintain the structural strength of the outer panel 120, that is, while ensuring that the sound-absorbing cavity 121 has noise reduction performance, it also takes into account structural reliability.

[0041] As an alternative embodiment, the outer panel 120 is a honeycomb panel, with the honeycomb structure 122 of the honeycomb panel facing the receiving cavity 103. For example... Figure 5 As shown, Figure 5 This is a schematic diagram of the structure of the honeycomb panel in this application embodiment; the honeycomb panel can reduce noise through the honeycomb structure 122 distributed on its surface; specifically, the sound waves entering the honeycomb structure can convert and consume sound energy through multiple reflections, scattering and resonance effects; at the same time, the difference in acoustic impedance between the honeycomb structure 122 and the panel of the honeycomb panel further blocks the transmission of noise, thereby achieving the purpose of sound absorption and insulation.

[0042] Furthermore, since honeycomb panels are lightweight and low-cost, using honeycomb panels to form the outer panel 120 helps reduce the overall weight of the battery pack and achieve a lightweight design; at the same time, the lower material cost can effectively control the battery pack manufacturing cost.

[0043] In some embodiments, the sound insulation cavity 130 is filled with a sound insulation layer 131; such as Figure 3 and Figure 4As shown, for the first housing 101 and the second housing 102, by adding a sound insulation layer 131 in the sound insulation cavity 130, the difference in acoustic impedance is increased, and the noise reduction effect is significantly improved. Specifically, when noise is transmitted to the sound insulation layer 131, the sound insulation layer 131 can reflect and absorb the noise to enhance the weakening effect of the noise transmitted to the sound insulation cavity 130 and achieve effective noise attenuation, thereby improving the overall noise reduction performance of the high-voltage box.

[0044] Furthermore, the sound insulation layer 131 includes at least one of a polyester fiber material layer and a bubble insulation material layer.

[0045] For example, the porous structure of the polyester fiber material layer can significantly improve the sound absorption performance of the high-voltage box; in addition, while enhancing the sound insulation effect, the lightweight properties of the polyester fiber material layer help to achieve a lightweight design of the high-voltage box, and the weaker thermal insulation performance can ensure that the heat dissipation function of the BDU is not affected.

[0046] For example, since the bubble insulation material has multiple elastic air pocket structures, it has excellent sealing sound insulation and vibration reduction performance, which can effectively block noise and suppress structural sound transmission; therefore, using the bubble insulation material layer as the sound insulation layer 131 can not only improve the noise reduction effect, but its lightweight characteristics also help to reduce the weight of the shell and achieve lightweight optimization of the overall structure.

[0047] In some embodiments, the inner panel 110 and the outer panel 120 are detachably connected by fasteners; this design can reduce the assembly difficulty between the inner panel 110 and the outer panel 120, improve the molding efficiency of the first housing 101 and the second housing 102, and also facilitate the subsequent addition of a sound insulation layer 131 inside the sound insulation cavity 130.

[0048] As an alternative embodiment, the inner panel 110 and the outer panel 120 are sealed together by an adhesive; this design simplifies the assembly process of the inner panel 110 and the outer panel 120 and also improves the sealing performance of the sound insulation cavity 130, thereby optimizing the sound insulation performance of the high-voltage box.

[0049] As an alternative embodiment, the inner panel 110 and the outer panel 120 are integrally injection molded. This design not only significantly improves the connection strength between the inner panel 110 and the outer panel 120, but also eliminates the assembly process between the inner panel 110 and the outer panel 120, which helps to shorten the manufacturing cycle of the high-voltage box.

[0050] In some embodiments, the first housing 101 extends toward the second housing 102 to form a connecting arm 201, and the connecting arm 201 has a snap-fit ​​window 2011; the second housing 102 protrudes away from the receiving cavity 103 to form a protrusion 202, and the protrusion 202 has a guide slope 2021 for guiding it into the snap-fit ​​window 2011, and is embedded in the snap-fit ​​window 2011 outside the receiving cavity 103.

[0051] Specifically, such as Figure 6 and Figure 7 As shown, Figure 6 This is a schematic diagram illustrating a first type of connection between the first housing 101 and the second housing 102 in an embodiment of this application. Figure 7 This is a partial enlarged view of the high-voltage box in an embodiment of this application. The first housing 101 and the second housing 102 of the high-voltage box can be connected by a snap-fit ​​structure formed by the connecting arm 201 and the protrusion 202. When assembling the high-voltage box, the connecting arm 201 of the first housing 101 and the protrusion 202 of the second housing 102 are aligned and brought closer to each other until the protrusion 202 is embedded in the snap-fit ​​window 2011 of the connecting arm 201. Thus, the first housing 101 and the second housing 102 are assembled by snap-fitting the connecting arm 201 and the protrusion 202. This ensures the firmness of the connection between the first housing 101 and the second housing 102 and improves the assembly efficiency of the high-voltage box.

[0052] Furthermore, the protrusion 202 has a guide slope 2021 for guiding it into the snap-fit ​​window 2011. Therefore, during the connection process of the first housing 101 and the second housing 102, the guide slope 2021 allows the protrusion 202 to slide smoothly into the snap-fit ​​window 2011, reducing the difficulty of docking the connecting arm 201 with the protrusion 202, thereby improving the convenience of assembling the high-voltage box.

[0053] Furthermore, relative to the receiving cavity 103 of the high-voltage box, the snap-fit ​​structure formed by the connecting arm 201 of the first housing 101 and the protrusion 202 of the second housing 102 is located outside the receiving cavity 103. This allows for a direct inspection of whether the high-voltage box is fully assembled, improving the disassembly and maintainability of the high-voltage box.

[0054] In some embodiments, the first housing 101 extends toward the second housing 102 to form a connecting arm 201, and the connecting arm 201 has a snap-fit ​​window 2011; the second housing 102 protrudes toward the receiving cavity 103 to form a protrusion 202, and the protrusion 202 has a guide slope 2021 for guiding it into the snap-fit ​​window 2011, and is embedded in the snap-fit ​​window 2011 in the receiving cavity 103.

[0055] Specifically, such as Figure 8 As shown, Figure 8This is a schematic diagram illustrating a second connection between the first housing 101 and the second housing 102 in an embodiment of this application. The first housing 101 and the second housing 102 of the high-voltage box can be connected via a snap-fit ​​structure formed by the connecting arm 201 and the protrusion 202. Similarly, during assembly, the connecting arm 201 of the first housing 101 and the protrusion 202 of the second housing 102 are aligned and brought closer together until the protrusion 202 is embedded in the snap-fit ​​window 2011 of the connecting arm 201. This allows the first housing 101 and the second housing 102 to be snap-fit ​​assembled via the connecting arm 201 and the protrusion 202, improving the assembly efficiency of the high-voltage box and providing good stability.

[0056] Furthermore, the protrusion 202 has a guide slope 2021 for guiding it into the snap-fit ​​window 2011. Therefore, during the connection process of the first housing 101 and the second housing 102, the guide slope 2021 allows the protrusion 202 to slide smoothly into the snap-fit ​​window 2011, reducing the difficulty of docking the connecting arm 201 with the protrusion 202, thereby improving the convenience of assembling the high-voltage box.

[0057] Furthermore, relative to the receiving cavity 103 of the high-voltage box, the snap-fit ​​structure formed by the connecting arm 201 of the first housing 101 and the protrusion 202 of the second housing 102 is located inside the receiving cavity 103, which can hide the snap-fit ​​structure and thus improve the appearance and refinement of the high-voltage box.

[0058] In some embodiments, one of the first housing 101 and the second housing 102 is provided with a first step portion 210, and the other is provided with a second step portion 220. The second step portion 220 is embedded in the first step portion 210 and is engaged with each other.

[0059] Specifically, such as Figure 9 and Figure 10 As shown, Figure 9 This is a schematic diagram illustrating a third type of connection between the first housing 101 and the second housing 102 in an embodiment of this application. Figure 10 This is a schematic diagram of a fourth connection between the first housing 101 and the second housing 102 in an embodiment of this application. More specifically, by providing a first step portion 210 in the first housing 101 and a second step portion 220 that cooperates with the first step portion 210 in the second housing 102, the second step portion 220 can be precisely fitted into the first step portion 210 during the high-voltage box assembly process, thereby reducing the difficulty of docking the first housing 101 and the second housing 102 and improving the assembly accuracy.

[0060] In some embodiments, the first step portion 210 has a snap-fit ​​window 2011, and the second step portion 220 protrudes from the receiving cavity 103 to form a protrusion 202. The protrusion 202 has a guide slope 2021 that is away from the second housing 102. The guide slope 2021 is used to guide the protrusion 202 to be embedded in the snap-fit ​​window 2011.

[0061] Specifically, such as Figure 9 As shown, the first housing 101 and the second housing 102 can be interlocked after the first step portion 210 and the second step portion 220 are precisely assembled, thereby improving the overall robustness of the high-voltage box. When assembling the high-voltage box, the first step portion 210 and the second step portion 220 are aligned and joined, so that the second step portion 220 is embedded in the first step portion 210. At the same time, the protrusion 202 of the second step portion 220 is gradually embedded into the snap-fit ​​window 2011 of the first step portion 210 and forms a snap-fit ​​structure until the two are completely aligned and the snap-fit ​​is fixed, ensuring the overall structural integrity of the high-voltage box.

[0062] Furthermore, the protrusion 202 has a guide slope 2021 that is away from the second housing 102. The guide slope 2021 is used to guide the protrusion 202 to be embedded in the snap-fit ​​window 2011. Therefore, when the first step 210 and the second step 220 are connected, the guide slope 2021 can allow the protrusion 202 to slide smoothly into the snap-fit ​​window 2011, reducing the difficulty of connecting the first step 210 and the second step 220, thereby improving the convenience of assembling the high-voltage box.

[0063] Furthermore, relative to the high-voltage box's receiving cavity 103, the snap-fit ​​structure formed by snapping the snap-fit ​​window 2011 opened on the first step portion 210 and the protrusion 202 on the second step portion 220 is located outside the receiving cavity 103, which allows for a direct inspection of whether the high-voltage box is fully assembled, thereby improving the high-voltage box's disassembly and maintainability.

[0064] As an alternative embodiment, the first step portion 210 protrudes towards the receiving cavity 103 to form a protrusion 202, the second step portion 220 of the protrusion 202 has a snap-fit ​​window 2011, and the protrusion 202 has a guide slope 2021 that is away from the second housing 102. The guide slope 2021 is used to guide the protrusion 202 to be embedded in the snap-fit ​​window 2011.

[0065] Specifically, such as Figure 10As shown, the first housing 101 and the second housing 102 can be interlocked after the first step portion 210 and the second step portion 220 are precisely assembled, thereby improving the overall robustness of the high-voltage box. When assembling the high-voltage box, the first step portion 210 and the second step portion 220 are aligned and joined, so that the second step portion 220 is embedded in the first step portion 210. At the same time, the protrusion 202 of the second step portion 220 is gradually embedded into the snap-fit ​​window 2011 of the first step portion 210 and forms a snap-fit ​​structure until the two are completely aligned and the snap-fit ​​is fixed, ensuring the overall structural integrity of the high-voltage box.

[0066] Furthermore, the protrusion 202 has a guide slope 2021 that is away from the second housing 102. The guide slope 2021 is used to guide the protrusion 202 to be embedded in the snap-fit ​​window 2011. Therefore, when the first step 210 and the second step 220 are connected, the guide slope 2021 can allow the protrusion 202 to slide smoothly into the snap-fit ​​window 2011, reducing the difficulty of connecting the first step 210 and the second step 220, thereby improving the convenience of assembling the high-voltage box.

[0067] Furthermore, relative to the receiving cavity 103 of the high-voltage box, the snap-fit ​​structure formed by the snap-fit ​​window 2011 on the first step portion 210 and the protrusion 202 of the second step portion 220 is located inside the receiving cavity 103, which can hide the snap-fit ​​structure and thus improve the appearance and refinement of the high-voltage box.

[0068] In some embodiments, along the protrusion direction of the protrusion 202, the height of the protrusion 202 is less than or equal to the depth of the snap-fit ​​window 2011. Specifically, as follows... Figure 9 and Figure 10 As shown, under the premise of ensuring that the protrusion 202 can be firmly embedded inside the snap-fit ​​window 2011, by making the height of the protrusion 202 less than or equal to the depth of the snap-fit ​​window 2011, the protrusion 202 can be prevented from protruding significantly on the surface of the high voltage box, thus ensuring the flatness of the surface of the high voltage box.

[0069] A second aspect of this application also provides a battery pack, comprising:

[0070] The high-voltage box, housing, and multiple battery modules are as described in any embodiment of the first aspect, wherein the high-voltage box and multiple battery modules are disposed within the housing.

[0071] Specifically, for a battery pack, the enclosure is the main load-bearing structure, providing installation locations for the high-voltage box and multiple battery modules, and providing mechanical protection.

[0072] The battery module is the main functional component of the battery pack. It can store electrical energy during charging and supply electrical energy to electrical devices during discharging, thereby realizing energy storage and supply.

[0073] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0074] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0075] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0076] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0077] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0078] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A high voltage box applied to a battery pack, characterized in that, include: First shell; The second housing is connected to the first housing and surrounds it to form a receiving cavity, and a contactor is provided in the receiving cavity; Both the first housing and the second housing include a stacked inner plate and an outer plate. The inner plate and the outer plate are connected and enclose to form a sound insulation cavity to block the noise generated by the contactor's engagement and disengagement.

2. The high-pressure cell of claim 1, wherein The outer plate is recessed on the side facing the receiving cavity to form multiple sound-absorbing cavities; or The outer panel is a honeycomb panel, and the honeycomb structure of the honeycomb panel is oriented towards the receiving cavity.

3. The high-pressure cell of claim 1, wherein, The sound insulation cavity is filled with a sound insulation layer, which includes at least one of a polyester fiber material layer and a bubble insulation material layer.

4. The high pressure cell of claim 1, wherein, The inner plate and the outer plate are detachably connected by fasteners; or The inner panel and the outer panel are sealed together by an adhesive; or The inner panel and the outer panel are integrally injection molded.

5. The high pressure cell of claim 1, wherein, The first housing extends toward the second housing to form a connecting arm, and the connecting arm has a snap-fit ​​window; The second housing protrudes from the receiving cavity to form a protrusion, the protrusion having a guide slope for guiding it into the snap-fit ​​window, and is embedded in the snap-fit ​​window outside the receiving cavity.

6. The high pressure cell of claim 1, wherein, The first housing extends toward the second housing to form a connecting arm, and the connecting arm has a snap-fit ​​window; The second housing protrudes toward the receiving cavity to form a protrusion, the protrusion having a guide slope for guiding it into the snap-fit ​​window, and is embedded in the receiving cavity within the snap-fit ​​window.

7. The high pressure cell of claim 1, wherein, One of the first housing and the second housing is provided with a first step portion, and the other is provided with a second step portion. The second step portion is embedded in the first step portion and is engaged with each other.

8. The high-pressure cell of claim 7, wherein, The first stepped portion has a snap-fit ​​window, and the second stepped portion protrudes away from the receiving cavity to form a protrusion. The protrusion has a guide slope away from the second housing, and the guide slope is used to guide the protrusion to be embedded in the snap-fit ​​window; or The first stepped portion protrudes towards the receiving cavity to form a protrusion. The second stepped portion of the protrusion has a snap-fit ​​window. The protrusion has a guide slope that is away from the second housing. The guide slope is used to guide the protrusion to be embedded in the snap-fit ​​window.

9. The high-pressure cell of claim 8, wherein, Along the protruding direction of the protrusion, the height of the protrusion is less than or equal to the depth of the snap-fit ​​window.

10. A battery pack, characterized by, include: The high-voltage box as described in any one of claims 1-9; Box; as well as Multiple battery modules are disposed within the housing, including the high-voltage box and the multiple battery modules.

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