Battery pack box body and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack box body and a battery pack, the battery pack box body comprises a bottom plate, the upper surface of the bottom plate is provided with a first connecting area; the runner plate is fixedly arranged on the lower surface of the bottom plate, the runner plate and the bottom plate are integrally formed, and the runner plate extends from the lower surface of the bottom plate to the direction away from the bottom plate to form a plurality of grooves; and the plurality of brackets are fixedly arranged in the first connecting area and are integrally formed with the bottom plate. According to the utility model, the support does not need to be arranged on the cross beam and the front beam in the battery pack box body in a penetrating manner, so that the material use cost of the support is reduced. The bottom plate, the runner plate and the bracket are integrally formed, so that the connection strength and integrity of the battery pack box body can be enhanced; in addition, the bracket does not need to be welded into the battery pack box body by additional manpower, so that the bracket welding procedure is reduced, and the labor cost and the welding cost are reduced; and meanwhile, the installation time of all parts in the battery pack box body can be shortened, so that the production efficiency of the battery pack box body is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a battery package box and battery package. BACKGROUND

[0002] With the rapid development of new energy automobile industry, new energy automobile has gradually merged into people's daily life. As the core component of new energy automobile, the cost reduction task of power battery is increasingly important. In the related technology, when the battery pack circuit breaking unit and the battery management system and other components are installed into the battery pack box, the bracket needs to be welded on the cross beam and the front beam of the battery pack box, and the bracket is arranged through the whole battery pack box, so that the battery pack circuit breaking unit and the battery management system and other components are installed into the battery pack box. However, the welding mode of the bracket seriously increases the material cost of the bracket, and when the bracket is welded into the battery pack box, the bracket needs to be welded into the battery pack box manually, so as to increase the labor cost and the welding cost; at the same time, the installation time of each component in the battery pack box is increased, which leads to low production efficiency of the battery pack box. SUMMARY

[0003] Therefore, the utility model provides a battery package box and battery package to solve the technical problem of high manufacturing cost and low production efficiency of the battery package box.

[0004] In the first aspect, the utility model provides a battery package box, which comprises:

[0005] A bottom plate, wherein the upper surface of the bottom plate is provided with a first connecting area;

[0006] A flow channel plate, which is fixedly arranged on the lower surface of the bottom plate and is integrally formed with the bottom plate, and a plurality of grooves are formed on the flow channel plate from the lower surface of the bottom plate to the direction away from the bottom plate;

[0007] A plurality of brackets, which are fixedly arranged in the first connecting area and are integrally formed with the bottom plate.

[0008] Advantages: by arranging a first connecting area on the upper surface of the bottom plate, a plurality of brackets are fixedly arranged in the first connecting area and fixedly connected on the upper surface of the bottom plate, so that the bracket does not need to be arranged through the cross beam and the front beam in the battery pack box, and the material use cost of the bracket is reduced. By integrally forming the bottom plate, the flow channel plate and the bracket, the connection strength and the integrity of the battery pack box can be enhanced; and during the assembly stage of the battery pack box, the bracket does not need to be welded into the battery pack box manually, so as to reduce the welding process of the bracket and reduce the labor cost and the welding cost; at the same time, the installation time of each component in the battery pack box can be reduced, so as to improve the production efficiency of the battery pack box.

[0009] In one optional embodiment, the bracket includes a first connecting portion, and the width A of the first connecting portion along the width direction of the bracket satisfies 15mm≤A≤35mm.

[0010] Beneficial effects: The bracket is fixedly connected to the base plate via the first connecting part, that is, the lower surface of the first connecting part is connected to the first connecting area. By setting an appropriate width for the first connecting part, sufficient connection strength and stability can be provided for the bracket, and it can also be reasonably installed on the base plate.

[0011] In one optional embodiment, the distance C from the lower surface of the first connecting part to the upper surface of the first connecting part along the height direction of the bracket satisfies 1mm≤C≤3mm.

[0012] Beneficial effects: By setting an appropriate support thickness, that is, the distance from the lower surface of the first connecting part to the upper surface of the first connecting part along the height direction of the support, it can be ensured that the first connecting part has sufficient thickness in the height direction to ensure that the first connecting part can withstand a certain pressure, and it can also avoid the increase in material costs due to excessive thickness of the first connecting part.

[0013] In one optional embodiment, the bracket further includes a second connecting portion, the length D of which, along the length direction of the bracket, satisfies 15mm≤D≤120mm.

[0014] Beneficial effects: The second connection part of the bracket can install components such as the battery pack circuit breaker unit and the battery management system. By setting a reasonable length for the second connection part, it can be ensured that the second connection part has sufficient length to support the battery pack circuit breaker unit and the battery management system, thereby improving the stability of the installation of each component. It can also avoid the increase in material costs caused by the second connection part being too long.

[0015] In one optional embodiment, the second connecting part is provided with a mounting hole, the diameter B of which satisfies 5mm≤B≤12mm.

[0016] Beneficial effects: By providing mounting holes on the second connection part, components such as the battery pack circuit breaker unit and the battery management system can be fixed on the bracket by the cooperation of fasteners and mounting holes; moreover, by setting a reasonable hole diameter, it can be ensured that the mounting hole has enough space to accommodate the corresponding fasteners, avoiding damage to the fasteners due to the hole diameter being too small and avoiding the fasteners from shaking in the hole due to the hole diameter being too large, thus affecting the stability of the connection.

[0017] In one optional embodiment, the distance E from the lower surface of the first connecting part to the upper surface of the second connecting part along the height direction of the bracket satisfies 35mm≤E≤150mm.

[0018] Beneficial effects: By determining the distance from the lower surface of the first connecting part to the upper surface of the second connecting part along the height direction of the bracket, i.e. the overall height of the bracket, and setting an appropriate bracket height, it is ensured that there is enough space between the two connecting parts to transmit force and stress when under load; it can also avoid the increase in material costs caused by excessive bracket height.

[0019] In one optional embodiment, the first connecting portion is provided in two parts, and is symmetrically arranged on both sides of the second connecting portion along the length direction of the bracket;

[0020] The bracket also includes a third connecting part, the two ends of which are fixedly connected to the first connecting part and the second connecting part, respectively.

[0021] Beneficial effects: By symmetrically distributing the two first connecting parts of the support along the length of the support on both sides of the second connecting part, the balance and stability of the support can be ensured. This allows the support to distribute force evenly to all parts when under stress, avoiding excessive local stress. Furthermore, the two first connecting parts and the second connecting part are connected together by a third connecting part. When the second connecting part is under pressure, the pressure can be transferred to the two first connecting parts through the third connecting part, resulting in a more even distribution of force throughout the entire support structure. This increases the overall structural strength and stability of the support, ensuring that it will not easily loosen, deform, or be damaged during use.

[0022] In one optional embodiment, the first connecting region is disposed on at least one side along the width direction of the base plate, the width a of the first connecting region along the length direction of the base plate satisfies 150mm≤a≤350mm, and the length b of the first connecting region along the width direction of the base plate satisfies 750mm≤b≤1750mm.

[0023] Beneficial effects: By setting the first connection area along the width direction of the base plate and on at least one side of the base plate width direction, it facilitates the fixing of components such as the battery pack circuit breaker unit and the battery management system onto the bracket. By setting an appropriate width and length of the first connection area, the bracket can be reasonably installed on the base plate with sufficient installation space.

[0024] In one alternative implementation, a plurality of the brackets are brazed together in the first connection area.

[0025] Beneficial effects: By brazing multiple brackets to the first connection area, the space on the base plate can be fully utilized, and the brackets can be effectively connected to the base plate, providing effective support for the installation of components such as the battery pack circuit breaker unit and the battery management system. Moreover, by fixing the brackets to the base plate by brazing, the welding process of the brackets can be reduced during the assembly of the battery pack housing, thereby reducing the assembly process of the battery pack housing, effectively improving the assembly time of the battery pack housing, and thus improving its production efficiency.

[0026] Secondly, this utility model also provides a battery pack, comprising:

[0027] The battery pack housing as described above;

[0028] A battery cover is provided on the battery pack housing, forming a sealed space with the battery pack housing;

[0029] A battery module is formed by combining multiple battery cells and is housed in a sealed space within the battery pack housing.

[0030] Beneficial effects: By installing the battery cover on the battery pack housing, a sealed space is formed, which helps protect the battery modules placed inside the housing and prevents external dust, moisture, and other impurities from entering the battery pack housing and causing damage to the battery modules. Because the battery pack includes the battery pack housing, the manufacturing cost of the battery pack can be reduced, while the assembly efficiency of the battery pack can be increased. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a front view of a battery pack housing according to an embodiment of the present utility model;

[0033] Figure 2 This is a bottom view of a battery pack housing according to an embodiment of the present utility model;

[0034] Figure 3 for Figure 2 A magnified view of part of H in the diagram;

[0035] Figure 4 This is a front view of a bracket in a battery pack housing according to an embodiment of the present utility model;

[0036] Figure 5 This is a bottom view of a bracket in a battery pack housing according to an embodiment of the present invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100, bracket; 110, first connecting part; 120, third connecting part; 130, second connecting part; 140, mounting hole; 200, battery pack housing; 210, first connecting area; 220, base plate; 230, flow channel plate. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] The following is combined Figures 1 to 5 The following describes embodiments of the present invention.

[0041] According to embodiments of the present invention, on the one hand, in conjunction with reference to... Figures 1 to 3 A battery pack housing 200 is provided, including: a base plate 220, the upper surface of which is provided with a first connection area 210; a flow channel plate 230, which is fixedly disposed on the lower surface of the base plate 220 and integrally formed with the base plate 220, and the flow channel plate 230 has a plurality of grooves extending from the lower surface of the base plate 220 away from the base plate 220; and a plurality of brackets 100, which are fixedly disposed in the first connection area 210 and are all integrally formed with the base plate 220.

[0042] In this embodiment, a first connecting area 210 is provided on the upper surface of the base plate 220 to fix multiple brackets 100 within the first connecting area 210 and to the upper surface of the base plate 220. This eliminates the need for the brackets 100 to penetrate the crossbeams and front beams within the battery pack housing 200, reducing the material cost of the brackets 100. By integrally molding the base plate 220, the flow channel plate 230, and the brackets 100, the connection strength and integrity of the battery pack housing 200 are enhanced. Furthermore, during the assembly stage of the battery pack housing 200, no additional manual labor is required to weld the brackets 100 into the battery pack housing 200, thereby reducing the welding process of the brackets 100 and lowering labor and welding costs. Simultaneously, the installation time of each component in the battery pack housing 200 is reduced, thereby improving the production efficiency of the battery pack housing 200.

[0043] likeFigure 4 , Figure 5 As shown, in one embodiment, the bracket 100 includes a first connecting portion 110, and the width A of the first connecting portion 110 along the width direction of the bracket 100 satisfies 15mm≤A≤35mm.

[0044] In this embodiment, the bracket 100 is fixedly connected to the base plate 220 via the first connecting portion 110, that is, the lower surface of the first connecting portion 110 is connected to the first connecting area 210. By setting an appropriate width for the first connecting portion 110, sufficient connection strength and stability can be provided for the bracket 100, and it can also be reasonably installed on the base plate 220. For example, if the width A of the first connecting portion 110 is too small, such as less than 15mm, deformation and damage may easily occur when the first connecting portion 110 is subjected to load, thereby affecting the overall performance and safety of the bracket 100. If the width A of the first connecting portion 110 is too large, such as greater than 35mm, it will result in material waste, increase material usage costs, and may also make it impossible to make reasonable space arrangements on the base plate 220. Specifically, the width A of the first connecting portion 110 can be 15mm, 20mm, 25mm, 30mm, 35mm, etc., and can be set according to actual usage requirements without specific limitation.

[0045] In one embodiment, the distance C from the lower surface of the first connecting portion 110 to the upper surface of the first connecting portion 110 along the height direction of the bracket 100 satisfies 1mm≤C≤3mm.

[0046] In this embodiment, by setting a suitable thickness for the bracket 100, specifically the distance from the lower surface to the upper surface of the first connecting portion 110 along the height direction of the bracket 100, it can be ensured that the first connecting portion 110 has sufficient thickness in the height direction to withstand a certain amount of pressure. Furthermore, it avoids increased material costs due to excessive thickness of the first connecting portion 110. For example, if the thickness of the bracket 100 is too small, such as less than 1mm, the first connecting portion 110 may deform or break under corresponding forces due to its weakness, affecting the overall reliability and safety of the bracket 100. If the thickness of the bracket 100 is too large, such as greater than 3mm, it may cause interference between the first connecting portion 110 and surrounding components during installation, making it impossible to arrange reasonably within a limited space. It also increases material usage, thereby increasing manufacturing costs. Specifically, the thickness of the bracket 100 can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc., and can be set according to actual usage requirements without specific limitations.

[0047] In one embodiment, the bracket 100 further includes a second connecting portion 130, and the length D of the second connecting portion 130 along the length direction of the bracket 100 satisfies 15mm≤D≤120mm.

[0048] In this embodiment, the second connecting portion 130 of the bracket 100 can be used to install components such as the battery pack circuit breaker unit and the battery management system. By setting a reasonable length for the second connecting portion 130, it can be ensured that the second connecting portion 130 has sufficient length to support the battery pack circuit breaker unit and the battery management system, thereby improving the stability of the installation of each component. It can also avoid increased material costs due to an excessively long second connecting portion 130. For example, if the length D of the second connecting portion 130 is too small, such as less than 15mm, the short length will not provide sufficient connection area, resulting in a weak connection and potential loosening or detachment during use, affecting the overall stability of the bracket 100. If the length D of the second connecting portion 130 is too large, such as greater than 120mm, it will be impossible to arrange the components reasonably within the limited installation space, and it will also increase the amount of material used, thereby increasing the manufacturing cost of the bracket 100. Specifically, the length D of the second connecting portion 130 can be 15mm, 30mm, 50mm, 80mm, 100mm, 120mm, etc., and can be set according to actual usage requirements.

[0049] In one embodiment, the second connecting part 130 is provided with a mounting hole 140, and the diameter B of the mounting hole 140 satisfies 5mm≤B≤12mm.

[0050] In this embodiment, mounting holes 140 are provided on the second connecting portion 130 to facilitate the fixing of components such as the battery pack circuit breaker unit and the battery management system to the bracket 100 through the cooperation of fasteners with the mounting holes 140. Furthermore, by setting a reasonable hole diameter, the mounting holes 140 can be designed to have sufficient space to accommodate the corresponding fasteners, preventing damage to the fasteners due to excessively small hole diameters and preventing the fasteners from wobbling within the hole due to excessively large hole diameters, thus affecting the stability of the connection. For example, if the hole diameter B of the mounting hole 140 is too small, such as less than 5mm, the fasteners or the material around the mounting hole 140 may be damaged, affecting the reliability and stability of the connection. If the hole diameter B of the mounting hole 140 is too large, such as greater than 12mm, the structural strength of the second connecting portion 130 will be reduced. When the components are supported by the second connecting portion 130, the second connecting portion 130 will be subjected to greater pressure, leading to deformation, breakage, and other problems, affecting the load-bearing capacity and safety of the bracket 100. Simultaneously, excessively large hole diameters can cause the fasteners to wobble within the hole, affecting the accuracy and stability of the connection. The diameter B of the mounting hole 140 can be 5mm, 7mm, 10mm, 12mm, etc., and can be set according to actual usage requirements.

[0051] In one embodiment, the distance E from the lower surface of the first connecting portion 110 to the upper surface of the second connecting portion 130 along the height direction of the bracket 100 satisfies 35mm≤E≤150mm.

[0052] In this embodiment, the distance from the lower surface of the first connecting part 110 to the upper surface of the second connecting part 130, i.e., the overall height of the bracket 100, is determined along the height direction of the bracket 100. A suitable bracket 100 height is then set to ensure sufficient space between the two connecting parts to transmit force and stress under load. This also avoids increased material costs due to an excessively high bracket 100 height. For example, if the bracket 100 height is too low (less than 35mm), components such as the battery pack circuit breaker and battery management system may not be effectively connected to the outside after being fixed on the bracket 100, increasing connection difficulty. If the bracket 100 height is too high (greater than 35mm), it will occupy too much space in the height direction, making proper arrangement impossible in a limited installation environment; it will also increase material usage and manufacturing costs. Specifically, the bracket 100 height can be 35mm, 50mm, 80mm, 120mm, 150mm, etc., and can be set according to actual usage requirements.

[0053] In one embodiment, two first connecting portions 110 are provided and are symmetrically arranged on both sides of the second connecting portion 130 along the length direction of the bracket 100; the bracket 100 also includes a third connecting portion 120, the two ends of which are fixedly connected to the first connecting portion 110 and the second connecting portion 130 respectively.

[0054] In this embodiment, by symmetrically distributing the two first connecting portions 110 of the bracket 100 along the length of the bracket 100 on both sides of the second connecting portion 130, the balance and stability of the bracket 100 can be ensured, allowing the bracket 100 to evenly distribute force to all parts when under stress, avoiding excessive local stress. The two first connecting portions 110 and the second connecting portion 130 are then connected together by the third connecting portion 120. When the second connecting portion 130 receives pressure, the pressure can be transmitted to the two first connecting portions 110 through the third connecting portion 120, resulting in a more even distribution of force throughout the entire bracket 100 structure. This increases the overall structural strength and stability of the bracket 100, ensuring that the bracket 100 will not easily loosen, deform, or be damaged during use.

[0055] In one embodiment, the first connection region 210 is disposed on at least one side along the width direction of the base plate 220, the width a of the first connection region 210 along the length direction of the base plate 220 satisfies 150mm≤a≤350mm; and the length b of the first connection region 210 along the width direction of the base plate 220 satisfies 750mm≤b≤1750mm.

[0056] In this embodiment, the first connection area 210 is arranged along the width direction of the base plate 220 and is located on at least one side of the base plate 220 to facilitate the fixing of components such as the battery pack circuit breaker unit and the battery management system onto the bracket 100. By setting an appropriate width and length for the first connection area 210, the bracket 100 can be reasonably installed on the base plate 220 with sufficient installation space.

[0057] By setting 150mm as the lower limit of the width of the first connecting area 210, sufficient width is ensured in the length direction of the base plate 220 to meet the requirements of connection strength and stability. Setting 350mm as the upper limit of the width of the first connecting area 210 avoids exceeding the reasonable space range of the base plate 220 in the length direction due to excessive width, which could cause interference between the bracket 100 and other components after it is fixed within the first connecting area 210. The width 'a' of the first connecting area 210 can specifically be 150mm, 200mm, 250mm, 300mm, 350mm, etc., and can be set according to actual usage requirements.

[0058] By setting 750mm as the lower limit of the length of the first connecting area 210, sufficient length in the width direction of the base plate 220 can be ensured to meet the installation space of the bracket 100, allowing for a more reasonable arrangement of the bracket 100 on the base plate 220. Setting 1750mm as the upper limit of the length of the first connecting area 210 keeps it within a reasonable size range, facilitating the proper installation of the bracket 100 and ensuring better integration of components such as the battery pack circuit breaker unit and the battery management system with the bracket 100. Specifically, the length b of the first connecting area 210 can be 750mm, 1000mm, 1250mm, 1500mm, 1750mm, etc., and can be set according to actual usage requirements.

[0059] In one embodiment, a plurality of brackets 100 are brazed together in the first connection region 210.

[0060] In this embodiment, by brazing multiple brackets 100 into the first connection area 210, the space on the base plate 220 can be fully utilized, and the brackets 100 can be effectively connected to the base plate 220, providing effective support for the installation of components such as the battery pack circuit breaker unit and the battery management system. Moreover, by fixing the brackets 100 to the base plate 220 by brazing, the welding process of the brackets 100 can be reduced during the assembly process of the battery pack housing 200, thereby reducing the assembly process of the battery pack housing 200, effectively improving the assembly time of the battery pack housing 200, and thus improving its production efficiency.

[0061] Specifically, the base plate 220 and flow channel plate 230 are first stamped and formed, and the bracket 100 is bent and formed. Then, flux is sprayed onto the surfaces of the flow channel plate 230 and the base plate 220 that are in contact with each other, and flux is also sprayed onto the surfaces of the first connecting part 110 of the bracket 100 and the base plate 220 that are in contact with each other. Next, a high-temperature resistant ink plate is pressed onto the second connecting part 130 of the bracket 100. Then, the entire assembly of the base plate 220, the flow channel plate 230, and the bracket 100 is placed into the rollers of a brazing furnace for high-temperature heating. After one hour of high-temperature heating, the brazing is completed, and the base plate 220, the flow channel plate 230, and the bracket 100 are integrally formed into a whole. This reduces the need for additional manual welding of the bracket 100 to the base plate 220, and improves the production efficiency of the battery pack housing 200.

[0062] According to an embodiment of the present invention, in a second aspect, the present invention also provides a battery pack, comprising: a battery pack housing 200; a battery cover plate disposed on the battery pack housing 200, forming a sealed space with the battery pack housing 200; and a battery module formed by assembling multiple battery cells and disposed in the sealed space within the battery pack housing 200.

[0063] In this embodiment, by installing a battery cover plate on the battery pack housing 200, a sealed space is formed between the battery cover plate and the housing 200. This facilitates the protection of the battery modules placed within the housing 200, preventing external dust, moisture, and other impurities from entering the housing 200 and thus avoiding damage to the battery modules. Because the battery pack includes the housing 200, the manufacturing cost of the battery pack can be reduced, while the assembly efficiency can be increased.

[0064] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack case characterized by, The application relates to a battery pack box body. The bottom plate is provided with a first connecting area on the upper surface. The flow channel plate is fixedly arranged on the lower surface of the bottom plate and is integrally formed with the bottom plate, and a plurality of grooves are formed on the flow channel plate and extend away from the bottom plate. A plurality of supports are fixedly arranged in the first connecting area and are integrally formed with the bottom plate.

2. The battery pack enclosure of claim 1, wherein, The support comprises a first connecting part, and the width A of the first connecting part along the width direction of the support satisfies 15mm<=A<=35mm.

3. The battery pack enclosure of claim 2, wherein, The distance C from the lower surface of the first connecting part to the upper surface of the first connecting part along the height direction of the support satisfies 1mm<=C<=3mm.

4. The battery pack enclosure of claim 2, wherein, The support further comprises a second connecting part, and the length D of the second connecting part along the length direction of the support satisfies 15mm<=D<=120mm.

5. The battery pack enclosure of claim 4, wherein, The second connecting part is provided with a mounting hole, and the hole diameter B of the mounting hole satisfies 5mm<=B<=12mm.

6. The battery pack enclosure of claim 4, wherein, The distance E from the lower surface of the first connecting part to the upper surface of the second connecting part along the height direction of the support satisfies 35mm<=E<=150mm.

7. The battery pack enclosure of claim 4, wherein, The first connecting part is provided with two and is symmetrically arranged on both sides of the second connecting part along the length direction of the support. The support further comprises a third connecting part, and the two ends of the third connecting part are fixedly connected with the first connecting part and the second connecting part.

8. The battery pack enclosure of any one of claims 1-7, wherein, The first connecting area is arranged on at least one side along the width direction of the bottom plate, the width a of the first connecting area along the length direction of the bottom plate satisfies 150mm<=a<=350mm, and the length b of the first connecting area along the width direction of the bottom plate satisfies 750mm<=b<=1750mm.

9. The battery pack enclosure of any one of claims 1-7, wherein, A plurality of supports are brazed in the first connecting area.

10. A battery pack, characterized by, The application relates to a battery pack box body. The battery cover plate is arranged on the battery pack box body and forms a sealed space with the battery pack box body. The battery module is formed by a plurality of battery cells and is arranged in the sealed space in the battery pack box body. ​

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