Battery pack

Abstract

The utility model relates to battery technology field discloses battery package, include: the lamination of a plurality of battery box units, and the battery box unit includes: box, the side opening of box is provided, and the other side of box is formed with the supporting structure opposite the opening, and the supporting structure includes heat exchange component, and the electric core has the first surface and the second surface of opposite setting, and the first surface's at least part is connected with heat exchange component and sets up, and the second surface's at least part is connected with the heat exchange component of adjacent battery box unit and sets up, the utility model discloses the supporting structure of box forms heat exchange component, and makes the electric core side, therefore, in the lamination of a plurality of battery box units, the opposite two sides of electric core in a layer battery box unit can respectively with the heat exchange component of this layer and the heat exchange component of adjacent layer connection heat exchange, increase the heat exchange area of electric core, promote the heat exchange effect of electric core.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to battery packs. Background Technology

[0002] The battery pack is a crucial component of new energy vehicles. It comprises a casing and cell modules, each consisting of multiple battery cells. These cells generate significant heat during charging and discharging. To ensure battery pack safety, cooling plates are typically installed within the pack to reduce overall temperature and prevent overheating of the cells, which could lead to safety incidents. The arrangement of the cells within the battery pack significantly impacts its energy density, safety, thermal management performance, and space utilization. Therefore, various cell arrangement methods exist in related technologies, such as upright, inverted, and side-mounted. When cells are side-mounted, ensuring effective heat exchange becomes a key research challenge. Utility Model Content

[0003] In view of this, the present invention provides a battery pack to solve the problem of poor heat exchange effect of the battery cells when the cells are placed on the side in the prior art.

[0004] This utility model provides a battery pack, comprising: a plurality of battery box units stacked together, each battery box unit comprising: a box body with an opening on one side, and a supporting structure formed on the other side of the box body opposite to the opening, the supporting structure including a heat exchange component; and a battery cell disposed within the box body, the battery cell having a first surface and a second surface disposed opposite to each other, at least a portion of the first surface being connected to the heat exchange component, the second surface being correspondingly disposed to the opening, the battery cell further having a third surface connecting the first surface and the second surface, the battery cell including a terminal post disposed on the third surface; wherein at least a portion of the second surface is connected to the heat exchange component of an adjacent battery box unit.

[0005] Beneficial effects: By utilizing the supporting structure of the housing to form heat exchange components and placing the battery cells on their sides, in several stacked battery housing units, the opposite sides of the battery cells located in one layer of the battery housing unit can connect and exchange heat with the heat exchange components of this layer and the heat exchange components of the adjacent layer, respectively, thereby increasing the heat exchange area of ​​the battery cells and improving the heat exchange effect of the battery cells.

[0006] In one optional embodiment, the housing further includes a plurality of side panels, which are arranged around the supporting structure. One end of each side panel is connected to the supporting structure, and the other ends of the side panels enclose the opening.

[0007] In one optional embodiment, the supporting structure includes a support portion connected to the side plate, the support portion forming a mounting hole, and the heat exchange component connected to the support portion and disposed in the mounting hole.

[0008] Beneficial effects: The heat exchange component is supported and installed using the support part, and the installation holes allow both sides of the heat exchange component to contact the upper and lower layers of the battery cells respectively, thereby improving the heat exchange effect between the heat exchange component and the battery cells.

[0009] In one alternative embodiment, the support structure further includes a reinforcing portion located within the mounting hole, with both ends of the reinforcing portion connected to the support portion.

[0010] Beneficial effects: By setting up reinforcements, the structural strength of the supporting structure can be guaranteed, thereby ensuring the structural strength of the enclosure.

[0011] In one optional embodiment, a plurality of battery cells are arranged in a row, and the battery pack further includes end plates and bands. The end plates are provided on both sides of the plurality of battery cells along the arrangement direction, and the bands are arranged around the two end plates and the plurality of battery cells. The end plates are connected to the support portion and / or the side plates.

[0012] Beneficial effects: By using the support and / or side plate as load-bearing components, the heat exchange components are fixed, reducing the stress on the heat exchange components and preventing them from deforming and failing due to excessive stress.

[0013] In one alternative embodiment, the first surface and the heat exchange component are bonded together using a thermally conductive adhesive, and the second surface and the heat exchange component are bonded together using a thermally conductive adhesive.

[0014] Beneficial effects: Connecting the battery cell and heat exchange components with thermally conductive colloid not only bonds and fixes the battery cell and heat exchange components to prevent them from separating, but also ensures the heat exchange effect of the battery cell and heat exchange components due to the thermal conductivity of the colloid.

[0015] In one optional embodiment, the heat exchange component includes a cooling plate with a flow channel inside, the two ends of which penetrate the surface of the cooling plate to form an inlet and an outlet, respectively.

[0016] Beneficial effects: The cooling plate cools the battery cell, preventing overheating and potential safety issues such as thermal runaway.

[0017] In one alternative embodiment, the cooling plates of several of the battery box units are connected in series.

[0018] Beneficial effects: It connects the flow channels of the cooling plates of several battery box units, forming an overall circulation of the water circuit of the battery pack, so that the cooling medium can exchange heat with the battery cells according to a predetermined path.

[0019] In one alternative embodiment, the heat exchange component includes a heating film.

[0020] Beneficial effects: By setting up a heating film, the battery cell can be heated, preventing the battery cell temperature from being too low and affecting the charging and discharging performance of the battery cell.

[0021] In one alternative embodiment, the plurality of battery pack units include a first unit and a second unit located at both ends in the stacking direction, the opening of the housing of the first unit is blocked by a supporting structure of the adjacent battery pack unit, and the battery pack further includes a cover structure that blocks the opening of the housing of the second unit.

[0022] Beneficial effects: By setting up a sealing structure, the openings in several battery box units that are not blocked by the supporting structure of adjacent boxes can be sealed, thereby improving the protection of the battery cells in that battery box unit. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a schematic diagram of the structure of a box according to an embodiment of the present utility model;

[0025] Figure 2 This is a cross-sectional view of a battery pack along the height direction according to an embodiment of the present invention (some battery cells are not shown);

[0026] Figure 3 This is a top view of a battery box unit according to an embodiment of the present utility model;

[0027] Figure 4 This is an exploded structural diagram of a box body according to an embodiment of the present utility model;

[0028] Figure 5 This is an exploded structural diagram of another box body according to an embodiment of the present utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Housing; 11. Support structure; 111. Heat exchange component; 112. Support part; 1121. Mounting hole; 113. Reinforcing part; 114. Connector; 12. Side plate; 2. Battery cell; 21. First surface; 22. Second surface; 23. Third surface; 24. Terminal post; 3. End plate; 4. Hoop; 5. Thermally conductive colloid; 10. Battery box unit; 101. First unit; 102. Second unit. Detailed Implementation

[0031] 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.

[0032] The following is combined Figures 1 to 5 The following describes embodiments of the present invention.

[0033] According to an embodiment of the present invention, a battery pack is provided, comprising: a plurality of battery box units 10 stacked together, each battery box unit 10 comprising: a box body 1, with an opening on one side of the box body 1, and a supporting structure 11 formed on the other side of the box body 1 opposite to the opening, the supporting structure 11 including a heat exchange component 111; and a battery cell 2 disposed within the box body 1, the battery cell 2 having a first surface 21 and a second surface 22 disposed opposite to each other, at least a portion of the first surface 21 being connected to the heat exchange component 111, the second surface 22 being correspondingly disposed to the opening, the battery cell 2 also having a third surface 23 connecting the first surface 21 and the second surface 22, the battery cell 2 including a terminal post 24 disposed on the third surface 23; wherein at least a portion of the second surface 22 is connected to the heat exchange component 111 of an adjacent battery box unit 10.

[0034] In the battery pack of this embodiment, the heat exchange component 111 is formed by the supporting structure 11 of the housing 1, and the battery cell 2 is placed on the side. Therefore, in the stacked battery housing units 10, the opposite sides of the battery cell 2 located in the battery housing unit 10 of the first layer can be connected to the heat exchange component 111 of the current layer and the heat exchange component 111 of the adjacent layer for heat exchange, thereby increasing the heat exchange area of ​​the battery cell 2 and improving the heat exchange effect of the battery cell 2.

[0035] In addition, the battery pack of this embodiment can also match the height of the housing 1 with the size of the battery cell 2, ensuring full utilization of the height space of the battery pack and improving the space utilization rate of the battery pack.

[0036] It is worth noting that, please refer to Figure 2The heat exchange component 111 is located at the bottom of the housing 1. The first surface 21 and the second surface 22 of the battery cell 2 are surfaces without poles 24, and the third surface 23 is the surface with poles 24. The first surface 21 is the bottom surface of the battery cell 2, the second surface 22 is the top surface of the battery cell 2, and the third surface 23 is the side surface of the battery cell 2, that is, the battery cell 2 is side-mounted.

[0037] It should be noted that in related technologies, for battery packs with side-mounted cells 2, the water-cooling plate is vertically positioned to the bottom of the housing 1, so that the side of the cell 2 opposite to the terminal post 24 is in contact with the water-cooling plate for heat exchange. This configuration requires a large number of water-cooling plates, complicates the installation process, and results in a small contact area between the cell 2 and the water-cooling plate, leading to low heat exchange efficiency. Furthermore, the lack of pressure transmission between the water-cooling plate and the cell 2 causes unstable contact and fit, further affecting the heat exchange effect. Additionally, in multi-layered battery packs in related technologies, to prevent the water-cooling plate from becoming a supporting component and deforming, its top cannot touch the bottom of the upper housing 1. Therefore, the height of the housing 1 is usually set higher than the height of the water-cooling plate to allow for a larger gap between the water-cooling plate and the upper housing 1, resulting in reduced space utilization of the battery pack.

[0038] In this embodiment, the bottom of the housing 1 is used as the heat exchange component 111, eliminating the need for additional water-cooling plates inside the housing 1, thus simplifying the overall structure of the housing 1 and streamlining the installation process. Furthermore, after the multi-layer battery box units 10 are stacked, both the upper and lower surfaces of the battery cell 2 can be connected to the heat exchange component 111 to achieve heat exchange, increasing the heat exchange area and improving heat exchange efficiency and uniformity. The two corresponding heat exchange components 111 on the upper and lower surfaces of the battery cell 2 can clamp and fix the battery cell 2, improving its stability and further ensuring the heat exchange effect. Simultaneously, the battery cell 2 can utilize the entire height space within the housing 1 along the height direction, improving the space utilization rate of the battery pack.

[0039] It should be noted that, for the cuboid structure of the square-shell battery cell 2, the first surface 21 and the second surface 22 are the two surfaces with relatively larger areas, that is, the areas of both the first surface 21 and the second surface 22 are larger than the area of ​​the third surface 23. In related technologies, regardless of whether the battery cell 2 is upright or sideways, the side of the battery cell 2 opposite to the third surface 23 (with the same area as the third surface 23) is in contact with the heat exchange component 111, resulting in a small contact area between the battery cell 2 and the heat exchange component 111 and low heat exchange efficiency. However, in this embodiment, both the first surface 21 and the second surface 22 are in contact with the heat exchange component 111, which can greatly increase the contact area between the battery cell 2 and the heat exchange component 111 and improve the heat exchange efficiency.

[0040] It is understood that, in this embodiment, please refer to Figure 1and Figure 2 The supporting structure 11 is the bottom of the box 1, and the top of the box 1 is set as an opening. When several battery box units 10 are stacked, the opening of the box 1 located in the lower layer is blocked by the supporting structure 11 of the box 1 located in the upper layer.

[0041] It is worth noting that the housings 1 of several battery box units 10 are connected, for example, by using screws.

[0042] In one embodiment, such as Figure 1 As shown, the box body 1 also includes several side plates 12, which are arranged around the supporting structure 11. One end of each side plate 12 is connected to the supporting structure 11, and the other ends of the side plates 12 enclose an opening. Specifically, in this embodiment, the box body 1 has a cuboid structure, and four side plates 12 are provided, each of which is connected to one of the four sides of the supporting structure 11. Of course, in other alternative embodiments, the box body 1 can also have other shapes, such as a polygonal prism. Accordingly, the shape of the supporting structure 11 and the number of side plates 12 can be arranged accordingly.

[0043] It is worth noting that, please refer to Figure 2 The third surface 23 of the battery cell 2 is parallel to the opposite side plate 12.

[0044] In one embodiment, such as Figure 4 As shown, the supporting structure 11 includes a support portion 112, which is connected to the side plate 12. The support portion 112 forms a mounting hole 1121. The heat exchange component 111 is connected to the support portion 112 and disposed in the mounting hole 1121. The support portion 112 supports and mounts the heat exchange component 111. Furthermore, by providing the mounting hole 1121, both sides of the heat exchange component 111 can contact the upper and lower layers of the battery cells 2 respectively, thereby improving the heat exchange effect between the heat exchange component 111 and the battery cells 2.

[0045] It is worth noting that in this embodiment, please refer to... Figure 1 and Figure 4 The support part 112 has a U-shaped structure. The outer peripheral edge of the support part 112 is connected to the four side plates 12 respectively, and the inner peripheral edge of the support part 112 forms a mounting hole 1121.

[0046] It is understandable that the original square plate at the bottom of the housing 1 is partially cut off according to the outer perimeter of the heat exchange component 111. The cut-off position forms the mounting hole 1121, and the remaining part forms the support part 112. This allows the heat exchange component 111 to be embedded in the mounting hole 1121 and adapted to the support part 112, thus ensuring the sealing performance of the housing 1.

[0047] In one embodiment, such as Figure 5As shown, the supporting structure 11 also includes a reinforcing part 113, which is located inside the mounting hole 1121, and both ends of the reinforcing part 113 are connected to the supporting part 112. By providing the reinforcing part 113, the structural strength of the supporting structure 11 can be guaranteed, thereby guaranteeing the structural strength of the housing 1.

[0048] Specifically, in this embodiment, such as Figure 5 As shown, the two ends of the reinforcing part 113 can be connected to the opposite sides of the support part 112, which has a U-shaped structure. It is understood that when the original solid square plate at the bottom of the housing 1 is cut away, not only the support part 112 but also the reinforcing part 113 is retained. That is, several holes are formed at intervals on the original solid square plate at the bottom of the housing 1, rather than a single large hole. In this case, the heat exchange component 111 can exchange heat with the upper and lower layers of battery cells 2 through the several holes.

[0049] It is worth noting that by providing the support part 112 and the reinforcing part 113, the heat exchange component 111 can be effectively and stably supported, so that the heat exchange component 111 and the lower battery cell 2 only contact each other to achieve heat transfer, without pressure transfer, ensuring that the lower battery cell 2 is not subject to pressure transfer from the upper heat exchange component 111 and the upper battery cell 2.

[0050] In one embodiment, such as Figure 3 As shown, several battery cells 2 are arranged in a row. The battery pack also includes end plates 3 and clamps 4. End plates 3 are provided on both sides of the several battery cells 2 along the arrangement direction. The clamps 4 are arranged around the two end plates 3 and the several battery cells 2. The end plates 3 are connected to the support part 112 and / or the side plate 12. The support part 112 and / or the side plate 12 are used as force-bearing components to fix the several battery cells 2, reduce the stress on the heat exchange component 111, and prevent the heat exchange component 111 from deforming and failing due to excessive stress.

[0051] Furthermore, in this embodiment, the end plate 3 is connected to the support portion 112 via fasteners. Of course, in other alternative embodiments, the end plate 3 can also be connected to the side plate 12; or, the end plate 3, the side plate 12, and the support portion 112 can be connected simultaneously.

[0052] It is worth noting that the hoop 4 can be arranged to wrap around vertically or horizontally.

[0053] In one embodiment, such as Figure 2As shown, the first surface 21 and the heat exchange component 111 are bonded together by thermally conductive adhesive 5, and the second surface 22 and the heat exchange component 111 are also bonded together by thermally conductive adhesive 5. Connecting the battery cell 2 and the heat exchange component 111 using thermally conductive adhesive 5 not only secures the battery cell 2 and the heat exchange component 111 to prevent separation, but also ensures the heat exchange effect of the battery cell 2 and the heat exchange component 111 due to the thermally conductive adhesive 5's thermal conductivity.

[0054] Specifically, in this embodiment, the thermally conductive colloid 5 is a thermally conductive structural adhesive.

[0055] It is worth noting that the thermally conductive structural adhesive also has a certain degree of compressibility, thus providing a certain compression space for the battery cell 2 and the heat exchange component 111, thereby absorbing the deformation of the battery cell 2 and the heat exchange component 111, and further preventing the heat exchange component 111 from deforming and being damaged.

[0056] It is worth noting that the height of each battery box unit 10 is calculated as the sum of the height of the battery cell 2 (the distance between the first surface 21 and the second surface 22), the thickness of the two layers of thermally conductive structural adhesive after compression, and the thickness of the heat exchange component 111. The width of each battery box unit 10 is calculated based on the required number of battery cells 2 and the number of columns of battery cells 2 when they are arranged in rows. The length of each battery box unit 10 is calculated based on the number of battery cells 2 in each column and the series-parallel connection method of the battery cells 2. At this time, the width direction of the box body 1 corresponds to the column direction of the battery cells 2, and the length direction of the box body 1 corresponds to the arrangement direction of each column of battery cells 2.

[0057] Of course, in other alternative implementations, the length direction of the housing 1 can be set to correspond to the column direction of the battery cells 2, and the width direction of the housing 1 can be set to correspond to the arrangement direction of each column of battery cells 2.

[0058] It should be further explained that the poles 24 of each column of cells 2 can be arranged in the same direction, or they can be arranged opposite each other or back to back.

[0059] In one embodiment, the heat exchange component 111 includes a cooling plate with a flow channel inside. The two ends of the flow channel penetrate the surface of the cooling plate to form an inlet and an outlet, respectively. The cooling plate is used to cool the battery cell 2, preventing the battery cell 2 from overheating and causing safety issues such as thermal runaway.

[0060] It is worth noting that, please refer to Figure 2 The cooling plate has mounting holes 1121 extending from both the top and bottom surfaces to facilitate connection with the battery cell 2.

[0061] Furthermore, in one embodiment, the cooling plates of several battery pack units 10 are connected in a manner that allows the flow channels of the cooling plates of the several battery pack units 10 to be interconnected, thus forming a complete water circulation in the battery pack and enabling the cooling medium to exchange heat with the battery cells 2 along a predetermined path.

[0062] It is worth noting that the cooling plates of several battery box units 10 can be connected in series or in parallel. Please refer to [link / reference]. Figures 1 to 5 The cooling plate has connectors 114 installed at its inlet and outlet. Furthermore, connector 114 can be a through-box connector (or a through-box connector can be further installed on connector 114). When the cooling plates of several battery box units 10 are connected in series, the through-box connectors of the inlet and outlet of adjacent battery box units 10 are connected sequentially through connecting pipes. When the cooling plates of several battery box units 10 are connected in parallel, the inlets of the cooling plates of several battery box units 10 are all connected to the cooling medium input end, and the outlets of the cooling plates of several battery box units 10 are all connected to the cooling medium output end.

[0063] In another embodiment, the heat exchange component 111 includes a heating film. By providing the heating film, the battery cell 2 can be heated, preventing the battery cell 2 from becoming too cold and affecting its charging and discharging performance.

[0064] It is worth noting that the shape of the mounting hole 1121 can be designed to be hollowed out according to the shape of the heating film.

[0065] In one embodiment, such as Figure 2 As shown, the battery pack includes several battery box units 10, including a first unit 101 and a second unit 102 located at both ends in the stacking direction. The opening of the box body 1 of the first unit 101 is blocked by the supporting structure 11 of the adjacent battery box unit 10. The battery pack also includes a cover structure that blocks the opening of the box body 1 of the second unit 102. By providing the cover structure, the openings of the several battery box units 10 that are not blocked by the supporting structure 11 of the adjacent box body 1 can be covered, thereby improving the protection effect on the battery cells 2 of the battery box unit 10.

[0066] It is worth noting that, please refer to Figure 2The first unit 101 is the battery box unit 10 located at the bottom, and the second unit 102 is the battery box unit 10 located at the top. The opening of the box body 1 of each battery box unit 10 is arranged facing upwards. The openings of the box body 1 of the first unit 101 and the battery box unit 10 located between the first unit 101 and the second unit 102 are all blocked by the supporting structure 11 of the box body 1 located above them. However, there are no other battery box units 10 arranged above the second unit 102, so the opening of the second unit 102 is not blocked. At this time, according to actual needs, a sealing structure can be set to block all the openings of the box body 1 of the second unit 102. Furthermore, the sealing structure includes a cover plate and a heat exchange structure. The heat exchange structure is arranged on the side of the cover plate facing the battery cell 2. The heat exchange structure is bonded to the second surface 22 of the battery cell 2 of the second unit 102 by thermally conductive structural adhesive.

[0067] It should be noted that in this embodiment, the battery cell 2 can be a square-shell battery cell 2, a blade battery cell 2, or a short blade battery cell 2.

[0068] 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, characterized in that, include: A plurality of battery box units (10) are stacked together, wherein each battery box unit (10) includes: A housing (1) has an opening on one side, and a supporting structure (11) is formed on the other side of the housing (1) opposite to the opening. The supporting structure (11) includes a heat exchange component (111). A battery cell (2) is disposed inside the housing (1). The battery cell (2) has a first surface (21) and a second surface (22) disposed opposite to each other. At least a portion of the first surface (21) is connected to the heat exchange component (111). The second surface (22) is disposed corresponding to the opening. The battery cell (2) also has a third surface (23) connecting the first surface (21) and the second surface (22). The battery cell (2) includes a pole post (24) disposed on the third surface (23). At least a portion of the second surface (22) is connected to the heat exchange component (111) of the adjacent battery box unit (10).

2. The battery pack according to claim 1, characterized in that, The box body (1) also includes several side plates (12), which are arranged around the supporting structure (11). One end of each side plate (12) is connected to the supporting structure (11), and the other ends of the side plates (12) enclose the opening.

3. The battery pack according to claim 2, characterized in that, The supporting structure (11) includes a support part (112), which is connected to the side plate (12). The support part (112) is surrounded to form a mounting hole (1121). The heat exchange component (111) is connected to the support part (112) and disposed in the mounting hole (1121).

4. The battery pack according to claim 3, characterized in that, The supporting structure (11) further includes a reinforcing part (113), which is located inside the mounting hole (1121), and both ends of the reinforcing part (113) are connected to the supporting part (112).

5. The battery pack according to claim 3, characterized in that, The battery cells (2) are arranged in a plurality of manner. The battery pack also includes end plates (3) and bands (4). The end plates (3) are provided on both sides of the plurality of battery cells (2) along the arrangement direction. The bands (4) are arranged around the two end plates (3) and the plurality of battery cells (2). The end plates (3) are connected to the support part (112) and / or the side plate (12).

6. The battery pack according to any one of claims 1 to 5, characterized in that, The first surface (21) and the heat exchange component (111) are bonded together by thermally conductive adhesive (5), and the second surface (22) and the heat exchange component (111) are bonded together by thermally conductive adhesive (5).

7. The battery pack according to any one of claims 1 to 5, characterized in that, The heat exchange component (111) includes a cooling plate, and a flow channel is provided in the cooling plate. The two ends of the flow channel penetrate the surface of the cooling plate to form an inlet and an outlet, respectively.

8. The battery pack according to claim 7, characterized in that, The cooling plates of several of the battery box units (10) are connected in series.

9. The battery pack according to any one of claims 1 to 5, characterized in that, The heat exchange component (111) includes a heating film.

10. The battery pack according to any one of claims 1 to 5, characterized in that, The battery pack includes a first unit (101) and a second unit (102) located at both ends in the stacking direction. The opening of the housing (1) of the first unit (101) is blocked by the supporting structure (11) of the adjacent battery pack unit (10). The battery pack also includes a cover structure that blocks the opening of the housing (1) of the second unit (102).

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