Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a battery cover body, the battery module comprises a plurality of stacked battery cells, and pressure relief openings of the battery cells face the battery cover body; the battery module is assembled in the battery frame, and the battery cover body is arranged on the battery frame in a covering manner; the plastic bracket is assembled between the battery module and the battery cover body, the plastic bracket is provided with a channel which is sunken towards the direction of the battery module, and a plurality of pressure relief through holes which are in one-to-one correspondence with the pressure relief openings of the battery cells are formed in the channel; the plastic bracket is provided with a first groove which is used for assembling a chip and is parallel to the channel; at least one protective layer is arranged between the plastic bracket and the battery cover body; and the protective layer covers the channel and the first groove. The utility model can solve the problems that the cover body in the existing battery pack is weak in compression resistance and easy to deform, so that the pressure relief space is changed.

Description

Technical Field

[0001] The utility model relates to the technical field related to batteries, and in particular to a battery pack. Background Art

[0002] With the rapid development of the new energy vehicle industry, the innovation and optimization of battery technology has become the focus of the industry. Among them, CTB (Cell to Body) battery technology has attracted widespread attention for its efficient integration and excellent performance.

[0003] In the existing CTB battery pack design, the pressure relief port of the battery cell is usually facing the cover of the battery pack. Although this design facilitates the release of heat and the regulation of pressure to a certain extent, it also brings new problems. Since the cover is usually lightweight, its pressure resistance is relatively weak. When the battery pack is subjected to external impact or internal pressure changes, the cover is prone to deformation. This deformation will change the pressure relief space between the pressure relief port and the cover, thereby affecting the normal pressure relief function of the battery pack, and may even cause the safety performance of the battery pack to decrease.

[0004] In addition, the deformation of the cover may also have adverse effects on other components in the battery pack. For example, the deformed cover may squeeze the battery cells or other components, causing damage to the internal structure of the battery pack or performance degradation. This not only affects the service life of the battery pack, but may also pose a threat to the safety performance of the vehicle. Utility Model Content

[0005] In order to overcome at least one of the defects of the prior art, the utility model provides a battery pack, which can solve the problem that the cover of the prior battery pack has weak pressure resistance and is easy to deform, resulting in changes in the pressure relief space.

[0006] The technical solution adopted by the utility model to solve the problem is:

[0007] A battery pack comprises: a battery cover; a battery module, the battery module comprising a plurality of stacked battery cells, the pressure relief ports of the battery cells facing the battery cover; a battery frame, the battery module being assembled in the battery frame, and the battery cover being covered on the battery frame; a plastic bracket, the plastic bracket being assembled between the battery module and the battery cover, the plastic bracket being provided with a groove recessed toward the battery module, the groove being provided with a plurality of pressure relief through holes corresponding to the pressure relief ports of the battery cells, the plastic bracket being provided with a first groove for assembling a tab and parallel to the groove; at least one protective layer being provided between the plastic bracket and the battery cover, the protective layer being covered on the groove and the first groove.

[0008] By adopting the above scheme, firstly, by assembling a plastic bracket between the battery module and the battery cover, and providing grooves on the plastic bracket that are recessed in the direction of the battery module, these grooves correspond to the pressure relief holes of the battery cells. Such a design can ensure that when the internal pressure of the battery module increases, the pressure relief port of the battery cell can release the pressure smoothly without being disturbed by the deformation of the cover. Secondly, at least one protective layer is provided between the plastic bracket and the battery cover, which can prevent the battery cover from directly squeezing the pressure relief port of the battery cell or squeezing the tab in contact with the battery cell when impacted by external force, thereby further enhancing the safety performance of the battery pack.

[0009] Furthermore, the protective layer includes a protective cover plate and a flap protective plate, a first step structure is provided on both sides of the inner wall of the groove, the protective cover plate is assembled on the first step structure, a second step structure is provided on both sides of the inner wall of the first groove, and the flap protective plate is assembled on the second step structure.

[0010] By adopting the above solution, the first step structure and the second step structure can provide a stable assembly space for the protective cover plate and the bar protection plate, thereby providing good protection for the battery pack and preventing the battery module from being deformed by the pressure of the cover body.

[0011] Furthermore, a surface of the protective cover plate facing the battery cover body and a surface of the tab protective plate facing the battery cover body are both aligned with a surface of the plastic bracket facing the battery cover body.

[0012] The adoption of the above solution helps to improve the overall stability of the plastic bracket.

[0013] Furthermore, the protective layer includes a third protective layer covering the channel and the first groove, and the third protective layer is attached to the inner side wall of the battery cover.

[0014] By adopting the above solution, the third protective layer can cover the entire plastic bracket, providing additional protection for the plastic bracket.

[0015] Furthermore, the protective layer includes a fourth protective layer, the number of the fourth protective layers is equal to the sum of the number of the grooves and the number of the first grooves, the fourth protective layers are all attached to the inner wall of the battery cover, and the area of ​​each of the fourth protective layers corresponds one-to-one to the area of ​​each of the grooves or the area of ​​the first grooves.

[0016] By adopting the above scheme, by attaching the fourth protective layer to the inner wall of the battery cover, the pressure resistance and strength of the battery cover itself can be improved, the risk of deformation of the battery cover itself can be reduced, thereby reducing the risk of extrusion of the channel and the internal structure of the first groove.

[0017] Furthermore, the protective layer further includes a first fixing layer arranged in a serpentine shape along the length direction of the battery cover, and / or the protective layer further includes a second fixing layer arranged in a serpentine shape along the width direction of the battery cover.

[0018] By adopting the above solution, the first fixing layer and the second fixing layer can absorb or disperse the impact force from the length direction and the width direction in turn, and prevent the battery cover from being deformed in this direction.

[0019] Furthermore, a second groove is provided on a side of the plastic bracket facing the battery module, and a collection circuit is provided in the second groove.

[0020] By adopting the above solution, it is helpful to reduce the space occupied by the circuit in the battery pack, making the structure of the battery pack more compact. Similarly, due to the presence of the second groove, when the plastic bracket is compressed by external force, it will not affect the collection circuit, thereby improving the safety of the collection circuit.

[0021] Furthermore, the second groove protrudes toward a side of the plastic bracket close to the battery cover to form a second boss, and a surface of the second boss facing the battery cover is aligned with a surface of the protective cover plate facing the battery cover.

[0022] The adoption of the above solution helps to improve the overall stability of the plastic bracket.

[0023] Furthermore, an explosion-proof valve is also provided on the battery core, and each of the pressure relief through holes corresponds to two of the explosion-proof valves.

[0024] By adopting the above solution, through a one-to-two approach, the structure of the pressure relief through hole can be simplified, while reducing consumables and achieving a strong quantitative design.

[0025] Furthermore, the battery frame includes a battery compartment and an electrical compartment, the battery compartment and the electrical compartment are adjacent and spaced apart, the battery cover is arranged above the battery compartment and the electrical compartment, the battery cover is provided with an electrical compartment opening corresponding to the electrical compartment, the electrical compartment opening cover is provided with an electrical compartment cover, and a support structure is arranged between the electrical compartment cover and the electrical compartment.

[0026] By adopting the above solution, a support structure is provided between the electrical compartment cover and the electrical compartment, which not only fixes and supports the electrical compartment cover, but also ensures the stability and spatial layout inside the electrical compartment.

[0027] In summary, the battery pack provided by the utility model has the following technical effects:

[0028] 1. By adding a protective layer between the plastic bracket and the battery cover, the safety performance of the battery pack is significantly enhanced. The groove on the plastic bracket corresponds to the pressure relief port of the battery cell, ensuring that the pressure can be released smoothly when the internal pressure of the battery increases, preventing the battery from exploding;

[0029] 2. By providing grooves on the plastic bracket, the protective layer and the grooves can prevent the battery cover from being deformed when impacted by external forces, thereby protecting the pressure relief port of the battery cell from being squeezed, greatly improving the safety of the battery;

[0030] 3. By setting a pressure relief through hole in the groove, a pressure relief space is reserved for the battery cell, and the protective layer can protect the pressure relief space, thereby improving the stability and safety of battery pressure relief;

[0031] 4. This design meets the lightweight design concept while taking into account its own pressure resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of a partial explosion structure of an embodiment of the utility model;

[0033] Figure 2 This is a schematic diagram of the assembly structure of the first fixed layer of an embodiment of the utility model;

[0034] Figure 3 This is a schematic diagram of the second fixing layer assembly structure of an embodiment of the utility model;

[0035] Figure 4 This is a schematic diagram of the fourth protective layer assembly structure of an embodiment of the utility model;

[0036] Figure 5 This is a schematic diagram of the assembly structure of the third protective layer of an embodiment of the utility model;

[0037] Figure 6 A schematic diagram of the internal structure of a battery pack according to an embodiment of the utility model;

[0038] Figure 7 This is a schematic diagram of the plastic bracket structure of an embodiment of the utility model.

[0039] Among them, the meanings of the figure marks are as follows: 1. battery cover; 11. electrical compartment opening; 2. battery module; 21. battery cell group; 22. explosion-proof valve; 3. plastic bracket; 31. groove; 311. pressure relief hole; 312. first step structure; 32. first groove; 321. bar assembly groove; 322. second step structure; 33. second groove; 34. second boss; 4. CCS assembly; 41. bar; 42. collection circuit; 43. sampling terminal; 5. battery frame; 51. battery compartment; 52. electrical compartment; 6. protective cover; 7. protective layer; 71. first fixed layer; 72. second fixed layer; 73. third protective layer; 74. fourth protective layer; 8. electrical compartment cover; 81. supporting mechanism; 9. bar protective plate. DETAILED DESCRIPTION

[0040] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described and discussed below in conjunction with the accompanying drawings of the present invention. Obviously, what is described here is only a part of the examples of the present invention, not all the examples. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] In order to facilitate the understanding of the embodiments of the present utility model, the following will be further explained by taking specific embodiments as examples in conjunction with the drawings, and each embodiment does not constitute a limitation on the embodiments of the present utility model.

[0042] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0044] Embodiment 1 of the present utility model is referred to Figure 1-Figure 7As shown, a battery pack is disclosed: comprising a battery cover 1, a battery module 2, a plastic bracket 3, a CCS assembly 4 and a battery frame 5, the battery frame 5 comprising a battery compartment 51 and an electrical compartment 52, the battery compartment 51 and the electrical compartment 52 are adjacent and spaced apart, the battery module 2 is assembled in the battery frame 5, the battery cover 1 is covered on the battery frame 5, the battery module 2 comprises a battery cell group 21 formed by stacking a plurality of battery cells, the battery cell groups 21 include but are not limited to being stacked along the length direction of the battery frame 5 or along the width direction, and can also be stacked in a field shape or the like, and this embodiment does not To be specific, the cells in the cell group 21 are all provided with explosion-proof valves 22, the pressure relief port of the explosion-proof valve 22 faces the battery cover 1, the plastic bracket 3 is assembled between the battery module 2 and the battery cover 1, the plastic bracket 3 is provided with a groove 31 recessed toward the battery module 2, and a plurality of pressure relief through holes 311 corresponding to the pressure relief ports of the cells are opened in the groove 31, the number of grooves 31 is adapted to the number of cell groups 21, and the number of pressure relief through holes 311 can ensure that the pressure above the explosion-proof valve 22 of each cell can be relieved, preferably, each pressure relief through hole 311 corresponds to two explosion-proof valves 22. The plastic bracket 3 is provided with a first groove 32 for assembling the bar sheet 41 and parallel to the groove 31; at least one protective layer is provided between the plastic bracket 3 and the battery cover 1, and the protective layer 7 is provided on the groove 31 and the first groove 32. By assembling a plastic bracket 3 between the battery module 2 and the battery cover 1, and providing grooves 31 recessed toward the battery module 2 on the plastic bracket 3, these grooves 31 correspond to the pressure relief holes 311 of the battery cells. Such a design can ensure that when the internal pressure of the battery module 2 increases, the pressure relief port of the battery cell can release the pressure smoothly without being disturbed by the deformation of the cover. Secondly, at least one protective layer 7 is provided between the plastic bracket 3 and the battery cover 1, which can prevent the battery cover 1 from directly squeezing the pressure relief port of the battery cell or squeezing the tab 41 in contact with the battery cell when impacted by external force, thereby further enhancing the safety performance of the battery pack.

[0045] In a specific embodiment, the protective layer 7 includes a protective cover plate 6 and a bar protection plate 9, a first step structure 312 is provided on both sides of the inner wall of the groove 31, and the protective cover plate 6 is assembled on the first step structure 312, and a second step structure 322 is provided on both sides of the inner wall of the first groove 32, and the bar protection plate 9 is assembled on the second step structure 322. The first step structure 312 and the second step structure 322 can provide a stable assembly space for the protective cover plate 6 and the bar protection plate 9, thereby providing good protection for the battery pack and preventing the battery module 2 from being deformed by the pressure of the cover body. It should be noted that the surface of the protective cover plate 6 facing the battery cover body 1 and the surface of the bar protection plate 9 facing the battery cover body 1 are aligned with the surface of the plastic bracket 3 facing the battery cover body 1, which helps to improve the overall stability of the plastic bracket 3. Optionally, the protective cover plate 6 and the first step structure 312 include but are not limited to being fixed by gluing or clamping, and the bar protection plate 9 and the second step structure 322 include but are not limited to being fixed by gluing or clamping.

[0046] In a specific embodiment, the protective layer 7 includes a third protective layer 73 covering the groove 31 and the first groove 32, and the third protective layer 73 is attached to the inner wall of the battery cover 1. The area of ​​the third protective layer 73 is smaller than the area of ​​the battery cover 1, and it can completely cover the groove 31 and the first groove 32, so that the third protective layer 73 can cover the entire plastic bracket 3, providing additional protection for the plastic bracket 3, and the third protective layer 73 also plays the role of insulation and heat insulation. The third protective layer 73 and the battery cover 1 are fixed by gluing or welding, but are not limited to.

[0047] In a specific embodiment, the protective layer 7 includes a fourth protective layer 74, the number of which is equal to the sum of the number of the grooves 31 and the number of the first grooves 32, and the fourth protective layers 74 are all attached to the inner wall of the battery cover 1, and the area of ​​each fourth protective layer 74 corresponds to the area of ​​each groove 31 or the area of ​​the first groove 32. By attaching the fourth protective layer 74 to the inner wall of the battery cover 1, the pressure resistance and strength of the battery cover 1 itself can be improved, and the risk of deformation of the battery cover 1 itself can be reduced, thereby reducing the risk of extrusion of the internal structure of the groove 31 and the first groove 32. At the same time, the fourth protective layer 74 also plays the role of insulation and heat insulation. The fourth protective layer 74 and the battery cover 1 include but are not limited to being fixed by gluing or welding.

[0048] Optionally, the protective layer further includes a first fixing layer 71 arranged in a serpentine shape along the length direction of the battery cover 1, and / or the protective layer 7 further includes a second fixing layer 72 arranged in a serpentine shape along the width direction of the battery cover 1. The first fixing layer 71 and the second fixing layer 72 can absorb or disperse the impact force from the length direction and the width direction in turn to prevent the battery cover 1 from deforming in this direction.

[0049] Preferably, in this embodiment 1, in order to further improve the stability of the battery cover 1, a protective layer 7 is provided between the protective cover 6 and the battery cover 1. The protective layer 7 includes the protective cover 6, the bar protection plate 9, the third protective layer 73, the first fixed layer 71 and the second fixed layer 72. The first fixed layer 71 and the second fixed layer 72 are preferably glue layers, which play an auxiliary fixing and supporting role. This embodiment does not limit the specific materials of other protective layers, as long as the protective effect can be achieved. In other embodiments, the number of protective layers is not specifically limited and can be combined at will.

[0050] In this embodiment 1, the CCS component 4 includes a plurality of tabs 41, a collection circuit 42 and a sampling terminal 43. In addition to the groove 31, the plastic bracket 3 is also provided with a first groove 32 corresponding to the battery cell pole. The first groove 32 is parallel to the groove 31. A plurality of tab assembly grooves 321 are provided in the first groove 32. The tab 41 is used to communicate with the pole. When the tab 41 is assembled into the first groove 32, the top of the tab 41 does not protrude outside the first groove 32. Therefore, in some embodiments, in order to facilitate improving the stability of the working environment of the tab 41, optionally, a second step structure 322 is provided on both sides of the inner wall of the first groove 32 for installing the tab protection plate 9; a second boss 34 protruding toward the battery cover 1 is provided on the plastic bracket 3 next to the first groove 32. In disguise, a second groove 33 is formed below the second boss 34, that is, toward the side of the battery module, for accommodating the collection circuit 42. In order to enable the acquisition circuit 42 to collect information of the bar sheet 41, a plurality of channels are provided between the first groove 32 and the second groove 33 for the sampling terminal 43 to pass through, so as to collect information of the bar sheet 41. It should be noted that each battery cell group 21 needs to have a corresponding groove 31 on the plastic bracket 3, and the groove 31 to the two sides are the second boss 34 and the first groove 32 in sequence. When the groove 31 is covered with a protective cover plate 6 and the first groove 32 is covered with a bar sheet protection plate 9, the top surface of the second boss 34, the top surface of the protective cover plate 6 and the top surface of the bar sheet protection plate 9 form a plane, which ensures that the plastic bracket 3 can perfectly withstand pressure.

[0051] On the basis that the top surface of the second boss 34, the top surface of the protective cover plate 6 and the top surface of the flap protection plate 9 form a plane, the second fixing layer 72 is consistent with the direction of covering the protective cover plate 6 and the flap protection plate 9, and can provide auxiliary fixing effect. The first fixing layer 71 covers the protective cover plate 6 and the flap protection plate 9 in a perpendicular direction, and its track can cover the position where the protective cover plate 6, the flap protection plate 9 and the plastic bracket 3 are in contact, thereby improving the stable support effect provided by the plastic bracket 3. When the battery cell group 21 is arranged in multiple rows, the adjacent flap protection plates 9 can be arranged in one piece to improve assembly stability.

[0052] Preferably, the protective cover plate 6 is made of high temperature resistant and impact resistant material to resist thermal runaway of the battery cell, while the bar protection plate 9 is mainly used to protect the electrical connection components and can be made of a material that is insulating and has a certain degree of pressure resistance.

[0053] In some embodiments, an electrical compartment cover 8 is also included. The electrical compartment cover 8 can be screwed to the battery cover 1 and the battery frame 5 respectively by screws. In this embodiment 1, the battery cover 1 has an electrical compartment opening 11 reserved at the electrical compartment 52. The electrical compartment cover 8 is screwed above the electrical compartment opening 11, so the electrical compartment cover 8 is arranged on the battery cover 1. Optionally, in order to improve the weighing capacity of the electrical compartment cover 8, a support structure can be arranged in the electrical compartment 52 to provide additional support for the electrical compartment cover 8. Preferably, the support mechanism 81 is a hollow support block. It should be noted that in order to improve the sealing performance of the locking, a seal needs to be provided at the locking position.

[0054] In summary, the battery pack provided by the utility model has the following technical effects:

[0055] 1. By adding a protective layer 7 between the plastic support 3 and the battery cover 1, the safety performance of the battery pack is significantly enhanced. The groove 31 on the plastic support 3 corresponds to the pressure relief port of the battery cell, ensuring that the pressure can be released smoothly when the internal pressure of the battery increases, preventing the battery from exploding;

[0056] 2. By providing the groove 31 on the plastic bracket 3, the protective layer 7 cooperates with the groove 31 to prevent the battery cover 1 from being deformed when subjected to external force impact, thereby protecting the pressure relief port of the battery cell from being squeezed, greatly improving the safety of the battery;

[0057] 3. By setting the pressure relief through hole 311 in the groove 31, a pressure relief space is reserved for the battery cell, and the protective layer 7 can protect the pressure relief space, thereby improving the stability and safety of the battery pressure relief;

[0058] 4. This design meets the lightweight design concept while taking into account its own pressure resistance.

[0059] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A battery pack, characterized in that: include: Battery cover (1); A battery module (2), the battery module (2) comprising a plurality of stacked battery cells, wherein the pressure relief ports of the battery cells face the battery cover (1); A battery frame (5), wherein the battery module (2) is assembled in the battery frame (5), and the battery cover (1) is covered on the battery frame (5); A plastic bracket (3), the plastic bracket (3) being mounted between the battery module (2) and the battery cover (1), the plastic bracket (3) being provided with a groove (31) recessed toward the battery module (2), the groove (31) being provided with a plurality of pressure relief through holes (311) corresponding to the pressure relief holes of the battery cells, and the plastic bracket (3) being provided with a first groove (32) for mounting a tab and parallel to the groove (31); At least one protective layer (7) is provided between the plastic support (3) and the battery cover (1), and the protective layer (7) covers the channel (31) and the first groove (32).

2. A battery pack according to claim 1, characterized in that: The protective layer (7) comprises a protective cover plate (6) and a flap protective plate (9), first step structures (312) are provided on both sides of the inner wall of the groove (31), and the protective cover plate (6) is assembled on the first step structure (312), and second step structures (322) are provided on both sides of the inner wall of the first groove (32), and the flap protective plate (9) is assembled on the second step structure (322).

3. A battery pack according to claim 2, characterized in that: The surface of the protective cover plate (6) facing the battery cover body (1) and the surface of the flap protective plate (9) facing the battery cover body (1) are both aligned with the surface of the plastic bracket (3) facing the battery cover body (1).

4. A battery pack according to claim 1, characterized in that: The protective layer (7) comprises a third protective layer (73) covering the channel (31) and the first groove (32); the third protective layer (73) is attached to the inner side wall of the battery cover (1).

5. A battery pack according to claim 1, characterized in that: The protective layer (7) comprises a fourth protective layer (74), the number of the fourth protective layers (74) being equal to the sum of the number of the grooves (31) and the number of the first grooves (32), the fourth protective layers (74) being all attached to the inner side wall of the battery cover (1), and the area of ​​each fourth protective layer (74) corresponding one-to-one to the area of ​​each groove (31) or the area of ​​the first groove (32).

6. A battery pack according to any one of claims 1 to 5, characterized in that: The protective layer (7) further comprises a first fixing layer (71) arranged in a serpentine shape along the length direction of the battery cover (1), and / or the protective layer (7) further comprises a second fixing layer (72) arranged in a serpentine shape along the width direction of the battery cover (1).

7. A battery pack according to claim 2, characterized in that: A second groove (33) is also provided on the side of the plastic support (3) facing the battery module (2), and a collection circuit (42) is provided in the second groove (33).

8. A battery pack according to claim 7, characterized in that: The second groove (33) protrudes toward the side of the plastic bracket (3) close to the battery cover (1) to form a second boss (34), and the surface of the second boss (34) facing the battery cover (1) is aligned with the surface of the protective cover plate (6) facing the battery cover (1).

9. A battery pack according to any one of claims 1 to 5, characterized in that: An explosion-proof valve (22) is also provided on the battery core, and each of the pressure relief through holes (311) corresponds to two explosion-proof valves (22).

10. A battery pack according to any one of claims 1 to 5, characterized in that: The battery frame (5) comprises a battery compartment (51) and an electrical compartment (52), wherein the battery compartment (51) and the electrical compartment (52) are adjacent to each other and arranged at intervals, wherein the battery cover (1) is arranged above the battery compartment (51), wherein the battery cover (1) is provided with an electrical compartment opening (11) corresponding to the electrical compartment (52), wherein the electrical compartment opening (11) is covered with an electrical compartment cover (8), and a support structure is arranged between the electrical compartment cover (8) and the electrical compartment (52).

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