Battery pack

Abstract

The utility model provides a battery pack, which comprises a box body, a plurality of battery cells, a plurality of battery cells and a plurality of battery cells, the box body is internally provided with an accommodating cavity, and the accommodating cavity is internally provided with partition beams which divide the accommodating cavity into a plurality of sub-cavities; the shells are arranged in the sub-cavities, the number of the shells is in one-to-one correspondence with the number of the sub-cavities, the battery cells are arranged in the shells, and heat exchange pipelines are formed on the bottom walls and the side walls of the shells; and the heat exchange pipeline is arranged in the box body, and the heat exchange pipeline is communicated with the heat exchange pipeline. According to the battery pack disclosed by the utility model, the heat exchange pipelines are arranged on the bottom wall and the side wall of the shell, so that the heat exchange area of the heat exchange pipelines can be increased, the heat exchange efficiency of the battery cells is effectively improved, and the safety of the battery cells can be further improved.

Description

Technical Field

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

[0002] In existing battery pack solutions, the cells generate heat during operation. To cool the cells, cooling plates are generally used. However, existing cooling plates only cool the bottom of the cells, and the contact area between the cooling plate and a single cell is small, resulting in poor cooling effect and long cooling time, which is not conducive to improving the heat exchange efficiency of the cells. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a battery pack that can improve the heat exchange efficiency of the battery cells.

[0004] A battery pack according to an embodiment of the present invention includes: a housing, wherein a receiving cavity is formed within the housing, and a partition beam is provided within the receiving cavity to divide the receiving cavity into multiple sub-cavities; a shell, wherein the shells are disposed within the sub-cavities, and the number of shells corresponds one-to-one with the number of sub-cavities; battery cells are disposed within the shells, and heat exchange pipelines are formed on the bottom wall and side walls of the shells; and heat exchange pipelines, wherein the heat exchange pipelines are disposed within the housing and are connected to the heat exchange pipelines of the multiple shells.

[0005] According to the battery pack of this utility model, heat exchange pipelines are provided on both the bottom wall and the side wall of the casing, which can increase the heat exchange area of ​​the heat exchange pipelines, effectively improve the heat exchange efficiency of the battery cell, and thus improve the safety of the battery cell.

[0006] According to some embodiments of the present invention, the housing is formed as a rectangular housing with an open top, and the heat exchange pipeline is provided on the bottom wall and side wall of the housing facing the inner side of the housing.

[0007] According to some embodiments of the present invention, the heat exchange pipeline includes: a first pipeline, which is disposed on the bottom wall of the shell and is formed in a ring shape; the number of the first pipelines is multiple and the multiple first pipelines are arranged at intervals along a first direction; and a second pipeline, which extends meanderingly along the circumference of the shell on the side wall of the shell, and the first pipeline connects to the second pipelines on the two side walls of the shell facing each other in a second direction, the first direction intersecting the second direction.

[0008] According to some optional embodiments of the present invention, the heat exchange pipeline includes: a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet being located at the upper edge of the shell, and both the liquid inlet and the liquid outlet being connected to the second pipeline.

[0009] According to some embodiments of the present invention, the heat exchange pipeline includes: an inlet pipe and an outlet pipe, both of which extend along the length of the housing; a first connecting pipe, which connects the inlet pipe and the inlet of the heat exchange pipeline; and a second connecting pipe, which connects the outlet pipe and the outlet of the heat exchange pipeline.

[0010] According to some embodiments of the present invention, the partition beam includes: a first beam extending along the width direction of the box body, the number of the first beams being multiple, the multiple first beams being spaced apart along the length direction of the box body, the first beams dividing the receiving cavity in the length direction of the box body; and a second beam extending along the length direction of the box body, the second beam dividing the receiving cavity in the width direction of the box body.

[0011] According to some optional embodiments of the present invention, there are two second beams, which are arranged at intervals along the width direction of the box body and divide the first beam into two segments in the extension direction of the first beam. A wiring cavity is defined between the two second beams, and the heat exchange pipeline is disposed in the wiring cavity.

[0012] According to some embodiments of the present invention, the upper end of the second beam is provided with a clearance groove, the clearance groove penetrates the second beam along the thickness direction of the second beam, and the first connecting pipe and the second connecting pipe of the heat exchange pipeline pass through the clearance groove and are connected to the heat exchange pipeline; or, the wire harness of the adjacent battery cell passes through the clearance groove and is electrically connected.

[0013] According to some embodiments of this utility model, the partition beam is an aluminum silicate fiber component.

[0014] According to some embodiments of the present invention, the battery pack includes: a cover plate, the top of the housing is open, and the cover plate covers the open side of the housing.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a battery pack according to an embodiment of the present utility model, excluding the cover plate;

[0017] Figure 2 yes Figure 1 An exploded view of the battery pack shown;

[0018] Figure 3 yes Figure 2A schematic diagram of the box shown;

[0019] Figure 4 yes Figure 2 A schematic diagram of the casing shown.

[0020] Figure label:

[0021] 100. Battery pack;

[0022] 10. Box body; 11. Divider beam; 111. First beam; 112. Second beam; 1121. Clearance groove; 12. Sub-cavity; 13. Cable routing cavity; 14. Control compartment;

[0023] 20. Shell; 21. Heat exchange pipeline; 211. First pipeline; 212. Second pipeline; 213. Liquid inlet; 214. Liquid outlet;

[0024] 30. Heat exchange piping; 31. Liquid inlet pipe; 32. Liquid outlet pipe; 33. First connecting pipe; 34. Second connecting pipe;

[0025] 40. Battery cells;

[0026] 50. Cover plate. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0028] The following is a reference appendix. Figure 1-4 A battery pack 100 according to an embodiment of the present utility model is described.

[0029] Reference Figure 1 and Figure 2 The battery pack 100 according to an embodiment of the present utility model includes: a housing 10, a shell 20, and a heat exchange pipeline 30.

[0030] Specifically, the housing 10 has a receiving cavity, and a partition beam 11 is provided in the receiving cavity. The partition beam 11 divides the receiving cavity into multiple sub-cavities 12. That is, the number of sub-cavities 12 can be two, three, four or more. The shell 20 is located in the sub-cavities 12, and the number of shells 20 corresponds one-to-one with the number of sub-cavities 12. The battery cell 40 is located in the shell 20. The bottom wall and side wall of the shell 20 are both formed with heat exchange pipelines 21. The heat exchange pipeline 30 is located in the housing 10 and is connected to the heat exchange pipelines 21 of the multiple shells 20.

[0031] For example, Figure 1 and Figure 2 As shown, the partition beam 11 inside the housing 10 divides the accommodating cavity into eight sub-cavities 12. Each sub-cavity 12 is equipped with a shell 20. The heat exchange pipeline 30 is located inside the housing 10 and is connected to the heat exchange pipeline 21 of the shell 20. Preferably, the shell 20 is made of aluminum alloy, which can reduce the weight of the shell 20 while ensuring its strength.

[0032] When the battery pack 100 is running, the refrigerant in the heat exchange pipeline 30 flows from the heat exchange pipeline 30 to the heat exchange line 21. The refrigerant in the heat exchange line 21 exchanges heat with the battery cell 40, thereby maintaining the battery cell 40 at a constant temperature and ensuring that the battery cell 40 operates at a suitable temperature.

[0033] The battery pack 100 of this utility model has heat exchange pipelines 21 on the bottom wall and side wall of the housing 20. When the refrigerant in the heat exchange pipeline 30 flows into the heat exchange pipeline 21, the heat exchange pipeline 21 can exchange heat with multiple heat dissipation surfaces of the battery cell 40, thereby increasing the heat exchange area of ​​the heat exchange pipeline 21, saving heat exchange time, effectively improving the heat exchange efficiency of the battery cell 40, and thus improving the safety performance of the battery cell 40. At the same time, the battery cell 40 is located inside the housing 20, which can protect the battery cell 40, thereby effectively preventing the battery cell 40 from contacting and being damaged by the internal structure of the housing 10, and thus improving the service life of the battery cell 40.

[0034] In addition, the housing 10 is divided into multiple sub-cavities 12, which can isolate adjacent housings 20. Even if a cell 40 in a certain housing 20 experiences thermal runaway, it can prevent that cell 40 from affecting the cells 40 in the adjacent housings 20, thus further improving the safety of the battery pack 100.

[0035] According to the embodiment of the present invention, the battery pack 100 is provided with heat exchange pipelines 21 on the bottom wall and side wall of the housing 20, thereby increasing the heat exchange area of ​​the heat exchange pipelines 21, effectively improving the heat exchange efficiency of the battery cell 40, and thus improving the safety of the battery cell 40.

[0036] According to some embodiments of this utility model, refer to Figure 2 and Figure 4 The housing 20 is formed as a rectangular housing with an open top. The heat exchange pipeline 21 is located on the bottom wall and the side wall of the housing 20 facing the inside of the housing 20. As a result, the heat exchange pipeline 21 is closer to the battery cell 40, which makes it easier for the heat exchange pipeline 21 to absorb the heat from the battery cell 40, thereby ensuring the heat exchange efficiency of the heat exchange pipeline 21.

[0037] According to some embodiments of this utility model, refer to Figure 2 and Figure 4The heat exchange pipeline 21 includes: a first pipeline 211 and a second pipeline 212. The first pipeline 211 is disposed on the bottom wall of the shell 20 and is formed in an annular shape. There are multiple first pipelines 211, and the multiple first pipelines 211 are arranged along a first direction (e.g., Figure 4 The first pipeline 211 is arranged at intervals in the left-right direction (as shown); the second pipeline 212 extends meanderingly along the circumference of the housing 20 on the side wall of the housing 20, and the first pipeline 211 connects the housing 20 in the second direction (as shown). Figure 4 The two side walls facing each other (as shown in the front-back direction) Figure 4 The second pipeline 212 on the front and rear sidewalls of the housing 20 shown intersects the first direction with the second direction.

[0038] In this way, by setting the first pipeline 211 as a ring, the heat exchange area of ​​the first pipeline 211 can be increased, thereby improving the heat exchange efficiency of the first pipeline 211. At the same time, multiple first pipelines 211 can be set, thereby further increasing the heat exchange area of ​​the first pipeline 211. Furthermore, the second pipeline 212 covers the entire side wall of the housing 20. The second pipeline 212 cooperates with the first pipeline 211, thereby maintaining the battery cell 40 at a constant temperature, thus ensuring the safe use of the battery cell 40.

[0039] For example, such as Figure 2 and Figure 4 As shown, the first pipeline 211 is formed into a rectangle and is arranged at intervals in the left and right direction. The second pipeline 212 extends meanderingly in the up and down direction along the circumference of the housing 20 on the side wall of the housing 20. The front side of the first pipeline 211 is connected to the second pipeline 212 on the front side wall, and the rear side of the second pipeline 212 is connected to the second pipeline 212 on the rear side wall.

[0040] According to some optional embodiments of the present invention, refer to Figure 2 and Figure 4 The heat exchange pipeline 21 includes an inlet 213 and an outlet 214, which are located at the upper edge of the housing 20. Both the inlet 213 and the outlet 214 are connected to the second pipeline 212. Thus, the inlet 213 facilitates the entry of refrigerant into the heat exchange pipeline 21 via the second pipeline 212, and the outlet 214 allows the refrigerant to flow out of the heat exchange pipeline 21 after heat exchange, thereby achieving the heat exchange function of the refrigerant on the battery cell 40.

[0041] For example, such as Figure 2 and Figure 4 As shown, the liquid inlet 213 and the liquid outlet 214 are both located at the upper end of the front side wall of the housing 20, and the liquid inlet 213 and the liquid outlet 214 are arranged at intervals in the left and right direction.

[0042] According to some embodiments of this utility model, refer to Figure 2 and Figure 3 The heat exchange pipeline 30 includes: an inlet pipe 31, an outlet pipe 32, a first connecting pipe 33, and a second connecting pipe 34. Both the inlet pipe 31 and the outlet pipe 32 are along the length of the housing 10 (e.g., ...). Figure 2 The box 10 shown extends in the left and right direction; the first connecting pipe 33 connects the liquid inlet pipe 31 and the liquid inlet 213 of the heat exchange pipeline 21; the second connecting pipe 34 connects the liquid outlet pipe 32 and the liquid outlet 214 of the heat exchange pipeline 21.

[0043] In this way, the first connecting pipe 33 can connect the inlet pipe 31 to the inlet port 213 without adjusting the structure of the inlet pipe 31 to connect with the inlet port 213, thereby reducing the processing difficulty of the inlet pipe 31 and facilitating the connection between the inlet pipe 31 and the inlet port 213. The second connecting pipe 34 can connect the outlet pipe 32 to the outlet port 214 without adjusting the structure of the outlet pipe 32 to connect with the outlet port 214, thereby reducing the processing difficulty of the outlet pipe 32 and facilitating the connection between the outlet pipe 32 and the outlet port 214.

[0044] For example, Figure 2 and Figure 3 As shown, the inlet pipe 31 and the outlet pipe 32 both extend in the left-right direction, the first connecting pipe 33 extends in the front-back direction, one end of the first connecting pipe 33 is connected to the inlet pipe 31, and the other end of the first connecting pipe 33 is connected to the inlet 213 of the heat exchange pipeline 21, the second connecting pipe 34 extends in the front-back direction, one end of the second connecting pipe 34 is connected to the outlet pipe 32, and the other end of the second connecting pipe 34 is connected to the outlet 214 of the heat exchange pipeline 21.

[0045] According to some embodiments of this utility model, refer to Figure 2 and Figure 3 The partition beam 11 includes: a first beam 111 and a second beam 112, wherein the first beam 111 is along the width direction of the box body 10 (e.g., Figure 3 The box 10 shown extends in the front-to-back direction, and there are multiple first beams 111, that is, there can be two, three, four or more first beams 111. These multiple first beams 111 extend along the length of the box 10 (e.g., in the longitudinal direction). Figure 3 The boxes 10 shown are arranged at intervals in the left and right directions. The first beam 111 divides the receiving cavity in the length direction of the box 10; the second beam 112 extends along the length direction of the box 10 and divides the receiving cavity in the width direction of the box 10.

[0046] In this way, the first beam 111 and the second beam 112 cooperate to divide the receiving cavity into multiple sub-cavities 12, thereby reasonably dividing the receiving cavity. Therefore, the volume of each sub-cavity 12 is the same, which ensures that each housing 20 can be properly installed into the sub-cavity 12. At the same time, the separation of adjacent sub-cavities 12 by the first beam 111 and the second beam 112 ensures that the cells 40 in adjacent housings 20 do not affect each other, thereby ensuring the safe use of the battery pack 100.

[0047] For example, such as Figure 2 and Figure 3 As shown, the first beam 111 extends in the front-to-back direction, and there are three first beams 111. The three first beams 111 are arranged at intervals in the left-to-right direction. The first beams 111 divide the receiving cavity into four sub-cavities 12 in the left-to-right direction. The second beam 112 extends in the left-to-right direction and is located in the middle position of the box 10 in the front-to-back direction. The second beam 112 divides the receiving cavity into eight sub-cavities 12 in the front-to-back direction.

[0048] According to some embodiments of this utility model, refer to Figure 2 and Figure 3 There are two second beams 112, and the two second beams 112 are along the width direction of the box body 10 (e.g., Figure 3 The box 10 shown is arranged at intervals in the front and rear directions, and the first beam 111 is placed in the extension direction of the first beam 111 (e.g., in the front and rear directions). Figure 2 The first beam 111 shown is divided into two sections (front and back direction), and a wiring cavity 13 is defined between the two second beams 112. The heat exchange pipe 30 is located in the wiring cavity 13. Thus, the wiring cavity 13 provides space for the arrangement of the heat exchange pipe 30, which facilitates the arrangement of the heat exchange pipe 30. At the same time, the second beams 112 can protect the heat exchange pipe 30, preventing the liquid ejected from the battery cell 40 during thermal runaway from directly splashing onto the heat exchange pipe 30. In the event of thermal runaway of the battery cell 40, it can be ensured that the heat exchange pipe 30 can still normally exchange heat with the battery cell 40.

[0049] In addition, the second beam 112 divides the first beam 111 into two sections, thereby ensuring the space within the wiring cavity 13 and facilitating the arrangement of the heat exchange pipeline 30.

[0050] For example, such as Figure 2 and Figure 3 As shown, two second beams 112 are arranged at intervals in the front-to-back direction. The second beams 112 divide each first beam 111 into two segments in the front-to-back direction. A wiring cavity 13 extending in the left-to-right direction is defined between the two second beams 112. The heat exchange pipeline 30 is located in the wiring cavity 13.

[0051] According to some embodiments of this utility model, refer to Figure 2 and Figure 3The upper edge of the second beam 112 (such as...) Figure 3 The upper end of the second beam 112 shown is provided with a clearance groove 1121, and the clearance groove 1121 is along the thickness direction of the second beam 112 (e.g., Figure 3 The thickness direction of the second beam 112 shown penetrates the second beam 112, and the first connecting pipe 33 and the second connecting pipe 34 of the heat exchange pipeline 30 pass through the clearance groove 1121 and are connected to the heat exchange pipeline 21. This facilitates the arrangement of the first connecting pipe 33 and the second connecting pipe 34, thereby facilitating the connection between the heat exchange pipeline 30 and the heat exchange pipeline 21.

[0052] Furthermore, if Figure 2 and Figure 3 As shown, the wire harnesses of adjacent battery cells 40 are electrically connected by passing through the clearance slot 1121. This facilitates the electrical connection of adjacent battery cells 40.

[0053] For example, such as Figure 2 and Figure 3 As shown, the upper end of the second beam 112 is provided with a clearance groove 1121. The clearance groove 1121 passes through the second beam 112 in the front-back direction. The first connecting pipe 33 passes through the clearance groove 1121 to connect the liquid inlet pipe 31 and the liquid inlet 213. The second connecting pipe 34 passes through the clearance groove 1121 to connect the liquid outlet pipe 32 and the liquid outlet 214. The wire harness passes through the clearance groove 1121 to connect the adjacent battery cell 40.

[0054] According to some embodiments of this utility model, refer to Figure 2 and Figure 3 The separator beam 11 is made of aluminum silicate fiber. As such, aluminum silicate fiber has high temperature resistance and low thermal conductivity. Heat source isolation helps to maintain the temperature uniformity of the cell 40 and prevent local overheating, thereby ensuring the life and efficiency of the entire battery pack 100. At the same time, aluminum silicate fiber has good mechanical strength, which can improve the overall mechanical strength of the battery pack 100.

[0055] According to some embodiments of this utility model, refer to Figure 2 and Figure 3 The battery pack 100 may include a cover 50, with the top of the housing 10 open, and the cover 50 sealing the open side of the housing 10. Thus, the cover 50 seals the housing 10, ensuring the airtightness of the battery pack 100 and consequently guaranteeing its safe use.

[0056] Furthermore, if Figure 1 As shown, the housing 10 also includes a control compartment 14, which is spaced apart from the receiving cavity. The heat exchange pipeline 30 is connected to the external pipeline within the control compartment 14. This facilitates the connection between the heat exchange pipeline 30 and the external pipeline, thereby ensuring the normal heat exchange function of the heat exchange pipeline 30.

[0057] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0059] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, include: The box has a cavity inside, and a partition beam is provided inside the cavity to divide the cavity into multiple sub-cavities. The housing is located inside the sub-cavity, and the number of housings corresponds one-to-one with the number of sub-cavities. The battery cell is located inside the housing, and heat exchange pipelines are formed on the bottom wall and side wall of the housing. The heat exchange pipeline is located inside the housing and is connected to the heat exchange pipelines of the plurality of housings.

2. The battery pack according to claim 1, characterized in that, The shell is formed as a rectangular shell with an open top, and the heat exchange pipeline is located on the bottom wall and side wall of the shell facing the inside of the shell.

3. The battery pack according to claim 2, characterized in that, The heat exchange pipeline includes: The first pipeline is located on the bottom wall of the housing. The first pipeline is formed in a ring shape. There are multiple first pipelines, and the multiple first pipelines are arranged at intervals along a first direction. The second pipeline extends circumferentially along the sidewall of the housing, and the first pipeline connects to the second pipeline on the two sidewalls of the housing facing each other in a second direction, the first direction intersecting the second direction.

4. The battery pack according to claim 3, characterized in that, The heat exchange pipeline includes an inlet and an outlet, which are located at the upper edge of the shell and are connected to the second pipeline.

5. The battery pack according to claim 1, characterized in that, The heat exchange pipeline includes: The inlet pipe and the outlet pipe extend along the length of the housing; A first connecting pipe is connected to the liquid inlet pipe and the liquid inlet of the heat exchange pipeline; The second connecting pipe connects the liquid outlet pipe and the liquid outlet of the heat exchange pipeline.

6. The battery pack according to claim 1, characterized in that, The partition beam includes: The first beam extends along the width direction of the box body, and there are multiple first beams. The multiple first beams are arranged at intervals along the length direction of the box body, and the first beams divide the receiving cavity in the length direction of the box body. The second beam extends along the length of the box and divides the receiving cavity in the width direction of the box.

7. The battery pack according to claim 6, characterized in that, The number of the second beams is two, and the two second beams are arranged at intervals along the width direction of the box body, and the first beam is divided into two segments in the extension direction of the first beam. A wiring cavity is defined between the two second beams, and the heat exchange pipeline is located in the wiring cavity.

8. The battery pack according to claim 7, characterized in that, The upper end of the second beam is provided with a clearance groove, which penetrates the second beam along its thickness direction. The first connecting pipe and the second connecting pipe of the heat exchange pipeline pass through the clearance groove and communicate with the heat exchange pipeline; or, The wire harnesses of adjacent battery cells are electrically connected through the clearance slot.

9. The battery pack according to claim 1, characterized in that, The partition beam is made of aluminum silicate fiber.

10. The battery pack according to claim 1, characterized in that, include: A cover plate, the top of the box is open, and the cover plate seals the open side of the box.

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