Battery pack upper shell structure and battery pack

Abstract

The utility model provides a battery pack upper shell structure and a battery pack. The upper shell structure of the battery pack comprises an upper shell body and a glue pressing plate, wherein the upper shell body is provided with a plurality of convex ribs which protrude upwards; the glue pressing plates are fixedly arranged on the face, opposite to the protruding ribs, of the upper shell body, and the multiple glue pressing plates are distributed in one-to-one correspondence with the protruding ribs. The upper shell body is provided with a first cavity due to the enclosure of the convex rib bulge and the adhesive pressing plate; and a through hole leading to the first cavity from the outside is formed in the adhesive pressing plate. The upper shell structure of the battery pack has better structural strength, can improve the phenomenon of glue overflow at the edge, and meets the process requirements of CTC technology on the upper shell structure of the battery pack.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a battery pack upper shell structure. The utility model also relates to a battery pack comprising the battery pack upper shell structure. Background Art

[0002] With the rapid development of new energy vehicle related technologies, new energy vehicles are becoming more and more popular. As one of the core technologies of new energy vehicles, battery pack integration technology will have a direct impact on the vehicle's endurance, safety and cost-effectiveness, and become a key factor in promoting the upgrading of the new energy vehicle industry. In recent years, CTC (Cell to Chassis) technology, that is, "cell to chassis" technology, is an important innovation in the field of battery pack integration technology. It represents the latest trend in the integration of battery pack design and vehicle structure. By using the battery pack shell as the chassis of the vehicle body, it is beneficial to improve the utilization rate of the battery pack to the vehicle body space, so as to achieve the purpose of improving the battery pack's endurance. However, this structure places higher requirements on the structural strength and comprehensive performance of the upper shell of the battery pack.

[0003] At present, most of the upper shells of battery packs are sheet metal components and are fixed to the top of the battery cell module by means of structural adhesive bonding. Since the upper shell is used as the chassis of the vehicle body in CTC technology, in order to improve the pedaling comfort of the occupants, the upper shell basically adopts a planar structure. However, the upper shell of the battery pack with a planar structure lacks supporting structures such as reinforcing ribs and ribs, and its own strength is difficult to meet the use requirements as a vehicle body chassis. In addition, due to the limitations of processing accuracy and process level, the flatness of the surface of the upper shell is often difficult to meet the bonding requirements of the upper surface of the battery cell module that fits tightly. In order to avoid the phenomenon of insufficient structural strength caused by hollowing in the bonding parts of the upper shell, the method of excessive glue coating is generally used for assembly. However, the phenomenon of glue overflow on the edge of the upper shell structure of the battery pack assembled in this way cannot be controlled, which has a certain negative impact on the processing cost and the quality of the finished product.

[0004] It can be seen from the above existing technologies that the structural strength of the upper shell of the battery pack used in the CTC technology is difficult to meet the use requirements, and there is a phenomenon of glue overflow at the edges. Utility Model Content

[0005] In view of this, the utility model aims to provide a battery pack upper shell structure, which has good structural strength and can improve the phenomenon of edge glue overflow.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] The utility model discloses a battery pack upper shell structure, comprising:

[0008] The upper shell body has a plurality of convex ribs protruding upwards;

[0009] A rubber pressing plate is fixedly mounted on a surface of the upper shell body opposite to the convex rib, and is arranged in a plurality of pieces corresponding to the convex ribs;

[0010] The upper shell body has a first cavity due to the convex rib protrusion and the enclosure of the rubber-pressed plate, and the rubber-pressed plate is provided with a through hole leading from the outside to the first cavity.

[0011] Furthermore, the through holes are constructed as circular through holes opened along the thickness direction of the glue pressing plate, and are arranged in a grid-like manner and are arranged at equal intervals on the glue pressing plate.

[0012] Furthermore, the glue pressing plate abuts against the top of the battery cell, and at least part of the through holes are distributed outside the overlapping area between the glue pressing plate and the top of the battery cell.

[0013] Furthermore, the diameter of the through hole is greater than 3 mm and less than 5 mm.

[0014] Furthermore, the edge of the upper shell body extends outward to form an extension portion, and the extension portion is constructed to be coplanar with the glue plate.

[0015] Furthermore, it also includes a connecting piece, which is fixedly arranged on a side of the upper shell body having the convex rib and is fixedly connected to the vehicle frame.

[0016] Furthermore, the connecting piece includes:

[0017] A connecting portion, the connecting portion being configured to be annular and fixedly fitted to a side surface of the upper shell body having the convex rib;

[0018] a raised portion, the raised portion being connected to an inner edge of the connecting portion and protruding in a direction away from the upper shell body;

[0019] The connecting hole is configured as a threaded hole that is penetrated on the raised portion along the thickness direction.

[0020] Furthermore, the connecting member is provided as a plurality of connecting members distributed one-to-one corresponding to the convex ribs;

[0021] The protrusion is buckled on the convex rib and forms a second cavity with the convex rib.

[0022] Furthermore, the connecting piece further comprises:

[0023] The flow channel hole is configured to be a plurality of flow channel holes that are connected to the outside and the second cavity. Compared with the prior art, the utility model has the following advantages:

[0024] The battery pack upper shell structure and battery pack described in the utility model include an upper shell body and a glue pressing plate. The upper shell body, as the main structure of the upper shell, can not only serve as a vehicle chassis, but also protect the battery cell module of the battery pack. The upper shell body is provided with convex ribs, and the convex rib structure can improve the structural strength and bearing capacity of the upper shell without substantially affecting the surface flatness of the upper shell, so that it can meet the structural strength requirements of the vehicle chassis. The glue pressing plate installed on the side opposite to the convex rib on the upper shell can squeeze and flatten the excess structural adhesive during the process of assembling the upper shell on the top of the battery cell module. The excess structural adhesive can enter the first cavity surrounded by the glue pressing plate and the convex rib through the through-hole structure on the glue pressing plate. Due to the first cavity's accommodation and retention of the excess structural adhesive, the excess structural adhesive is prevented from overflowing from the edge of the upper shell body.

[0025] In addition, by setting the through holes as circular through holes and arranging them in a grid-like manner and equidistantly arranged on the glue-pressing plate, the efficiency of the structural adhesive flowing into the first cavity through the through holes can be improved, and the possibility of the structural adhesive overflowing from the edge of the upper shell can be further reduced. By distributing at least part of the through holes on the outside of the overlapping area between the glue-pressing plate and the top of the battery cell, the excess structural adhesive in the first cavity can be discharged through the above-mentioned part of the through holes, ensuring the smoothness of the process of the structural adhesive flowing through the through holes to the first cavity. By controlling the diameter of the through holes within the range of 3 mm to 5 mm, it is possible to ensure the efficiency of the structural adhesive flowing into the first cavity through the through holes, and to ensure the structural strength of the glue-pressing plate itself, so that it can meet the structural strength requirements of the vehicle chassis.

[0026] Secondly, the edge of the upper shell body is extended outward to form an extension part, and the extension part is constructed to be coplanar with the glue plate, which can ensure the flatness of the side where the upper shell body and the glue plate are located, so that the side plane can better contact with the structural adhesive and reduce the possibility of hollowing phenomenon.

[0027] Furthermore, by arranging a connector on the upper shell body, the upper shell body can be fixedly connected to the vehicle frame, further improving the stability of the upper shell body inside the vehicle. The connector is arranged as a structure composed of a connecting portion and a protruding portion, wherein the connecting portion can fix the connector to the upper shell body. The protruding portion connected to the connecting portion protrudes in a direction away from the upper shell body, and an escape space is formed between it and the upper shell body. The connection hole provided on the protruding portion reserves an installation position for the installation of the fastening bolts provided on the vehicle frame and the connector. By arranging the connector to be a plurality of connectors corresponding to the ribs, and buckling the connector cover above the ribs, the area of ​​the connector and the ribs on the upper surface of the entire upper shell body is reduced, thereby ensuring the surface flatness of other parts of the upper shell body. By providing a flow channel hole on the connecting piece as an inflow or outflow channel for the electrophoretic liquid, the electrophoretic liquid can smoothly flow into or out of the second cavity surrounded by the raised portion and the rib during the metal surface treatment of the upper shell, thereby ensuring the quality of the metal surface treatment process of the upper shell.

[0028] In addition, the utility model also proposes a battery pack provided with the above-mentioned battery pack upper shell structure.

[0029] The battery pack described in the present invention has the same beneficial effects as the battery pack upper shell structure described above relative to the prior art, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0031] Figure 1 This is a schematic diagram of the exploded structure of the upper shell structure of the battery pack in the embodiment of the present application;

[0032] Figure 2 It is a partial longitudinal cross-sectional view of the upper shell structure of the battery pack in the embodiment of the present application;

[0033] Figure 3 This is a schematic diagram of the structure of the upper shell body in the embodiment of the present application;

[0034] Figure 4 This is a schematic diagram of the structure of the glue-pressed plate in the embodiment of the present application;

[0035] Figure 5 It is a schematic diagram of the structure of the connecting member in the embodiment of the present application.

[0036] Description of reference numerals:

[0037] 1. Upper housing body;

[0038] 101, convex rib; 102, first cavity; 103, extension portion;

[0039] 2. Glue board;

[0040] 201, through hole;

[0041] 3. Connectors;

[0042] 301, connecting portion; 302, protruding portion; 303, connecting hole; 304, second cavity; 305, flow channel hole. DETAILED DESCRIPTION

[0043] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0044] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0045] Taking a battery pack upper shell structure and a battery pack described in the present invention as an example, the directional words used in the embodiments, such as "up, down, left, right, front, and back", are defined based on the up and down direction (also known as the height direction, or the Z direction of the battery pack), the left and right direction (also known as the width direction, or the Y direction of the battery pack), and the front and back direction (also known as the length direction, or the X direction of the battery pack). "Inside and outside" are defined based on the contour of the corresponding parts. For example, "inside" and "outside" are defined based on the contour of the battery pack, and the side of the battery pack contour close to the middle of the battery pack is "inside", and the opposite is "outside".

[0046] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0047] The following will refer to the attached Figures 1 to 5 The utility model is described in detail in conjunction with the embodiments.

[0048] Embodiment 1

[0049] The present embodiment relates to a battery pack upper shell structure, which adopts an upper shell structure with convex ribs in combination with a glue pressing plate arranged in one-to-one correspondence with the convex ribs, so that a cavity for accommodating excess structural adhesive is formed between the convex ribs of the upper shell and the glue pressing plate. During the assembly process of the upper shell, excess structural adhesive can flow into the cavity through the through holes provided on the glue pressing plate. The cavity has the function of receiving and retaining excess structural adhesive, so as to achieve the purpose of improving the glue overflow phenomenon at the edge of the upper shell. At the same time, the convex rib structure can improve the structural strength of the upper shell without significantly affecting the surface flatness of the upper shell, so that it can meet the requirements of the CTC technology for the structural strength of the upper shell when the battery pack shell is directly used as the vehicle chassis process.

[0050] In terms of overall structure, refer to Figure 1 and Figure 2 The upper shell structure of the battery pack of this embodiment includes an upper shell body 1 and a glue plate 2. Among them, the upper shell body 1 can be a rectangular aluminum alloy metal sheet made by a sheet metal stamping one-piece molding process. The upper shell body 1 is buckled on the top of the battery pack cell module. A glue plate 2 is installed on one side of the upper shell body 1 close to the top of the cell by welding. The glue plate 2 can be a long strip of aluminum alloy metal sheet. In order to ensure the structural strength and bearing capacity of the glue plate 2, the thickness of the glue plate 2 is not less than twice the thickness of the shell. The glue plate 2 is provided with a through hole 201 for circulating structural adhesive. The area enclosed by the glue plate 2 and the upper shell body 1 is the first cavity 102.

[0051] As set above, in the process of installing the upper shell structure of the battery pack described in this embodiment on the top of the battery cell module of the battery pack, in order to avoid hollows formed by insufficient filling of the structural adhesive between the upper shell body 1 and the top of the battery cell module of the battery pack, the upper shell body 1 will be subjected to an excessive application of structural adhesive. In the process of the glue pressing plate 2 being buckled and pressed against the top of the battery cell module of the battery pack, the excess structural adhesive on the top of the battery cell module will first be flattened into a coating with uniform thickness, and at the same time, the excess structural adhesive will enter the first cavity 102 along the through hole 201 opened on the glue pressing plate 2 and communicating with the first cavity 102. The first cavity 102 will serve to store and retain the excess structural adhesive, thereby avoiding the situation where the excess structural adhesive overflows from the edge of the upper shell body 1.

[0052] Based on the above design concept, specifically, in this embodiment, refer to Figure 2 and Figure 3 , the upper shell body 1 also has a convex rib 101. The convex rib 101 is formed on the upper surface of the upper shell body 1 by stamping and integral molding, that is, the side of the upper shell body 1 opposite to the top of the battery pack battery module. The convex ribs 101 are arranged in parallel and equidistantly along the upper surface of the upper shell body 1. The convex ribs 101 arranged evenly and equidistantly can ensure that the structural strength and compressive resistance of various parts of the upper surface of the upper shell body 1 are at a relatively balanced level, which is conducive to reducing the occurrence of local deformation of the upper shell of the battery pack. The glue plate 2 is installed on the side of the upper shell body 1 close to the top of the battery pack battery module by welding, that is, the side plane opposite to the plane of the upper shell body 1 having the convex rib 101. The installation position of the glue plate 2 corresponds to the position of the convex rib 101. The enclosure of the glue plate 2 and the convex rib 101 constitutes a first cavity 102. The edge of the upper shell body 1 extends outward to form an extension 103. The extension part 103 is constructed so that the side close to the top of the cell module, that is, the side in direct contact with the structural adhesive, is coplanar with the side of the glue plate 2 close to the top of the cell module. By adopting the above structure, the coplanar structure formed by the glue plate 2 and the extension part 103 can better contact with the structural adhesive, forming an overall structure with higher bonding strength and better load-bearing capacity.

[0053] Reference Figure 2 and Figure 4In order to further optimize the improvement effect of the present application scheme on the glue overflow phenomenon at the edge of the upper shell body 1, in this embodiment, a through hole 201 is provided on the glue pressing plate 2, and the through hole 201 is constructed as a circular hole opened along the thickness direction of the glue pressing plate 2, connecting the outside and the first cavity 102. The diameter of the through hole 201 is greater than 3 mm and less than 5 mm. If the diameter of the through hole 201 is greater than 5 mm, the overall structural strength and bearing capacity of the glue pressing plate 2 will be weakened; if the diameter of the through hole 201 is less than 3 mm, it will have a greater impact on the smoothness of the structural glue flowing from the top of the battery module into the first cavity 102, so that the glue pressing plate 2 cannot squeeze the excess structural glue into the first cavity 102 well. When the diameter of the through hole 201 is within the above range, it can better balance the structural strength of the glue pressing plate 2 and the smoothness of the process of the structural glue flowing into the first cavity 102.

[0054] In order to improve the efficiency of the process of the structural adhesive flowing into the first cavity 102, in this embodiment, the through holes 201 are arranged in a grid-like manner and are densely and evenly spaced on the adhesive pressing plate 2. By increasing the number of through holes 201 and improving the area coverage of the through holes 201 to the adhesive pressing part, the effect of improving the flow efficiency of the structural adhesive is achieved.

[0055] It should be noted that the specific arrangement of the through holes 201 can be a matrix grid in which the lines between the dots of the through holes 201 intersect each other perpendicularly, or an inclined grid at a certain angle. In this embodiment, in order to simplify the processing process and reduce the processing cost of the rack, a matrix grid distribution method in which the lines between the dots of the through holes 201 intersect each other perpendicularly is selected. In actual application, the distribution form of the through holes 201 can be adaptively changed according to the shape of the upper shell body 1, the distribution of the ribs 101, and the glue coating on the top of the battery module.

[0056] When the first cavity 102 contains excessive structural adhesive, in order to discharge the excessive structural adhesive in the first cavity 102, at least part of the through holes 201 are distributed outside the overlapping area of ​​the adhesive laminating plate 2 and the top of the battery module. By adopting the above structure, the excess structural adhesive can flow out from the through holes 201 distributed outside the overlapping area, thereby maintaining the absorption function and absorption efficiency of the first cavity 102 for the structural adhesive.

[0057] Since the glue plate 2 and the upper shell body 1 are fixedly connected by welding, the edges of the glue plate 2 should be chamfered to minimize the influence of welding stress on the strength of the connection structure between the glue plate 2 and the upper shell body 1.

[0058] Reference Figure 2 and Figure 5In order to improve the structural stability of the upper shell body 1, in this embodiment, the upper shell structure of the battery pack further includes a connector 3. The connector 3 is fixedly mounted on the top of the upper shell body 1, that is, on one side of the upper shell body 1 having the rib 101, and the upper shell body 1 is fixedly connected to the vehicle frame by bolts, thereby achieving position fixation between the upper shell body 1 and the vehicle frame.

[0059] Specifically, the connector 3 includes a connecting portion 301 and a protruding portion 302. The connecting portion 301 is constructed as a ring that fits the upper surface of the upper shell body 1. The protruding portion 302 protrudes in a direction away from the surface of the upper shell body 1. The protruding portion 302 and the connecting portion 301 are fixedly connected by stamping and integrally forming to form the connector 3. A connecting hole 303 is provided on the protruding portion 302. The connecting hole 303 is constructed as a bolt hole opened along the thickness direction of the protruding portion 302. The fastening bolts for fixing the upper shell body 1 and the vehicle frame are passed through the connecting hole 303 on the protruding portion 302, and the side wall of the connecting hole 303 is provided with threads that match the fastening bolts. The protruding portion 302 protrudes upward, leaving an escape space for tightening the fastening bolts. By adopting the above structure, the connector 3 can not only fix the upper shell body 1 with the vehicle frame, but also further enhance the structural strength of the upper shell body 1.

[0060] In order to further improve the surface flatness of the upper shell body 1, the number of connectors 3 is consistent with the number of ribs 101, and they are buckled on the ribs 101 in a one-to-one correspondence. In order to prevent the ribs 101 from interfering with the installation of the fastening bolts used to fix the upper shell body 1 and the vehicle frame, the protrusion height of the protrusion 302 is greater than the height of the ribs 101. Since the connectors 3 are buckled on the ribs 101, compared with other distribution forms, the connectors 3 and the ribs 101 account for a smaller proportion of the overall surface area of ​​the upper shell body 1, ensuring the flatness of other parts of the upper shell body 1 not occupied by the ribs 101 and the connectors 3 structures, thereby improving the pedaling comfort of the vehicle occupants.

[0061] The space enclosed by the raised portion 302 and the rib 101 is the second cavity 304. The second cavity 304 is arranged to reserve an escape space for tightening the fastening bolts. A flow channel hole 305 is also provided on the connector 3. Both ends of the flow channel hole 305 connect the outside with the inside of the second cavity 304. The setting of the flow channel hole 305 allows the electrophoretic liquid to flow into the second cavity 304. In the process of metal surface treatment of the upper shell structure of the battery pack in the present application, the metal surface quality in the second cavity 304 is guaranteed. In order to improve the efficiency of the inflow and outflow of the electrophoretic liquid, the flow channel holes 305 are arranged to be a plurality of equally spaced holes distributed along the length direction of the connector 3. For the purpose of simplifying processing, the flow channel hole 305 can be a circular hole opened parallel to the thickness direction of the connecting portion 301.

[0062] Embodiment 2

[0063] This embodiment relates to a battery pack, including the battery pack upper shell structure involved in the first embodiment.

[0064] In this embodiment, the battery pack upper shell structure involved in the first embodiment is adopted. During the assembly process, the excess structural adhesive can enter the first cavity 102 surrounded by the glue plate 2 and the upper shell body 1 through the through hole 201 opened on the glue plate 2, so the phenomenon of excess structural adhesive overflowing from the edge of the upper shell body 1 is avoided. In addition to forming the first cavity 102 together with the glue plate 2, the convex rib 101 formed by integral stamping on the upper shell body 1 can also improve the structural strength and bearing capacity of the upper shell body 1 without significantly affecting the surface flatness of the upper shell body 1, so that it can meet the structural strength requirements of the battery pack shell directly used as the chassis of the vehicle body in the CTC process.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A battery pack upper shell structure, characterized in that: include: The upper shell body has a plurality of convex ribs protruding upwards; A rubber pressing plate is fixedly mounted on a surface of the upper shell body opposite to the convex rib, and is arranged in a plurality of pieces corresponding to the convex ribs; The upper shell body has a first cavity due to the convex rib protrusion and the enclosure of the rubber-pressed plate, and the rubber-pressed plate is provided with a through hole leading from the outside to the first cavity.

2. The upper housing structure of the battery pack according to claim 1, characterized in that: The through holes are constructed as circular through holes opened along the thickness direction of the glue pressing plate, and are arranged in a grid-like manner with equal intervals on the glue pressing plate.

3. The upper housing structure of the battery pack according to claim 2, characterized in that: The glue pressing plate is in contact with the top of the battery cell, and at least part of the through holes are distributed outside the overlapping area between the glue pressing plate and the top of the battery cell.

4. The battery pack upper shell structure according to claim 1, characterized in that: The diameter of the through hole is greater than 3 mm and less than 5 mm.

5. The upper housing structure of the battery pack according to any one of claims 1 to 4, characterized in that: The edge of the upper shell body extends outward to form an extension portion, and the extension portion is configured to be coplanar with the glue plate.

6. The upper housing structure of the battery pack according to claim 1, characterized in that: Also includes: A connecting piece is fixedly arranged on a side of the upper shell body having the convex rib and is fixedly connected to the vehicle frame.

7. The upper housing structure of the battery pack according to claim 6, characterized in that: The connecting piece comprises: A connecting portion, the connecting portion being configured to be annular and fixedly fitted to a side surface of the upper shell body having the convex rib; a raised portion, the raised portion being connected to an inner edge of the connecting portion and protruding in a direction away from the upper shell body; The connecting hole is configured as a threaded hole that is penetrated on the raised portion along the thickness direction.

8. The upper housing structure of the battery pack according to claim 7, characterized in that: The connecting members are arranged in a plurality and distributed one-to-one with the convex ribs; The protrusion is buckled on the convex rib and forms a second cavity with the convex rib.

9. The upper shell structure of the battery pack according to claim 8, characterized in that: The connecting piece also includes: A plurality of flow channel holes are configured to communicate the outside with the second cavity.

10. A battery pack, characterized in that: It comprises a battery pack upper shell structure as described in any one of claims 1 to 9.

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