Equipotential connection structure of battery pack shell and battery pack

Abstract

The utility model provides an equipotential connection structure of a battery pack shell and a battery pack, the equipotential connection structure of the battery pack shell is arranged between the battery pack shell and a liquid cooling plate, and the equipotential connection structure comprises a first conductive support and a second conductive support which are connected, the first conductive support is connected to the liquid cooling plate, the second conductive support is connected to a shell cross beam in the battery pack shell, and the first conductive support and the second conductive support form equipotential connection between the shell cross beam and the liquid cooling plate. According to the equipotential connection structure of the battery pack shell, equipotential connection between the shell cross beam and the liquid cooling plate can be realized, namely equipotential connection between the battery pack shell and the liquid cooling plate bracket can be realized, the reliability of equipotential electric connection can also be ensured, and the equipotential connection structure is convenient to install and connect, is also beneficial to reducing the manufacturing cost, and is suitable for popularization and application. And a good use effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of power battery assembly, and in particular to an equipotential connection structure of a battery pack shell. The utility model also relates to a battery pack provided with the equipotential connection structure of the battery pack shell. Background Art

[0002] Equipotential connection is an electrical connection that keeps the potential between each exposed conductive part of an electrical device and the external part of the device basically equal. The lower shell is the connecting element between the battery pack and the vehicle chassis and cockpit. In order to achieve the electrostatic protection, electromagnetic interference protection and personnel electric shock safety requirements of the entire vehicle, the lower shell often requires a reliable, low-cost equipotential design. Since the lower shell made of rolled steel has a high strength, close to the strength of self-tapping screws, the use of self-tapping screws will cause deformation and cause the shell to be scrapped. Therefore, the current rolled steel shell mainly uses bolts to achieve equipotential between different metal parts, and there are also conductive gaskets used between two metal surfaces for equipotential connection.

[0003] However, when bolts are used for fastening, the electrophoretic layer on the steel surface is often damaged due to the rotation characteristics of the bolts, which will cause corrosion and equipotential failure during vehicle operation. The use of conductive gaskets between two metal surfaces has high requirements for assembly or welding, which increases the process cost. Utility Model Content

[0004] In view of this, the utility model aims to propose an equipotential connection structure of a battery pack shell to ensure the reliability of the equipotential connection and help reduce manufacturing costs.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] An equipotential connection structure for a battery pack shell, the equipotential connection structure is arranged between the battery pack shell and a liquid cooling plate, and the equipotential connection structure includes a first conductive bracket and a second conductive bracket connected to each other, the first conductive bracket is connected to the liquid cooling plate, the second conductive bracket is connected to a shell beam in the battery pack shell, and the first conductive bracket and the second conductive bracket constitute an equipotential connection between the shell beam and the liquid cooling plate.

[0007] Furthermore, the first conductive bracket is in a "J" shape and has an arched portion and connecting ends arranged on both sides of the arched portion; the arched portion is connected to the second conductive bracket, and the connecting ends are welded and fixedly connected to the liquid cooling plate.

[0008] Furthermore, the second conductive bracket is "L"-shaped and has a horizontal plate and a vertical plate connected together; the horizontal plate is connected to the first conductive bracket, and the vertical plate is connected to the shell crossbeam.

[0009] Furthermore, a rivet nut is provided on the shell cross beam, and the vertical plate is screwed to the rivet nut by bolts.

[0010] Furthermore, the first conductive bracket and the second conductive bracket are detachably connected.

[0011] Furthermore, the first conductive bracket is provided with a first mounting hole, and the second conductive bracket is provided with a second mounting hole; a rivet nut is provided on one of the first mounting hole and the second mounting hole, and the first conductive bracket and the second conductive bracket are threadedly connected to the rivet nut by a bolt passing through the other of the first mounting hole and the second mounting hole.

[0012] Furthermore, the second mounting hole is an elongated hole, and the major axis of the elongated hole extends in a direction from the first conductive bracket to the housing cross beam.

[0013] Furthermore, an equipotential connection point is provided between the shell side beam of the battery pack shell and the liquid cooling plate; the equipotential point is located at the end of the shell side beam.

[0014] Furthermore, the equipotential connection point includes a through hole penetrating the shell side beam and the liquid cooling plate, and a blind rivet arranged in the through hole; the rivet head of the blind rivet is crimped on the shell side beam, and the flange surface of the blind rivet is riveted to the liquid cooling plate.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The equipotential connection structure of the battery pack shell described in the utility model is achieved by providing a first conductive bracket and a second conductive bracket that are connected to each other, and the first conductive bracket is connected to the liquid cooling plate, and the second conductive bracket is connected to the shell cross beam, thereby achieving an equipotential connection between the shell cross beam and the liquid cooling plate, that is, achieving an equipotential connection between the battery pack shell and the liquid cooling plate bracket, and also ensuring the reliability of the equipotential electrical connection, and facilitating installation and connection. At the same time, compared with high-demand assembly or welding methods, it is also beneficial to reduce manufacturing costs and has a good use effect.

[0017] In addition, the first conductive bracket adopts a "J" shape and has an arched portion and a connection end, which makes the structure simple, easy to manufacture and low in cost, and can increase the structural strength of the first conductive bracket by using the "J" shape structure, and is convenient to improve the connection between the first conductive bracket and the liquid cooling plate and the second conductive bracket. The second conductive bracket adopts an "L" shape, which also has the characteristics of simple structure, easy to manufacture and low in cost, and the "L" design structure is also convenient for the connection between the second conductive bracket and the first conductive bracket and the shell cross beam, and can absorb certain assembly errors.

[0018] Secondly, the vertical plate on the second conductive bracket is screwed to the cross beam of the shell by using rivet nuts and bolts, which is convenient for installation and operation, and can also avoid deformation of the shell caused by self-tapping screws, and can also ensure the reliability of the connection. The first conductive bracket and the second conductive bracket are screwed together, which has the characteristics of simple structure and convenient installation and operation, and can ensure the reliability of the connection between the first conductive bracket and the second conductive bracket.

[0019] In addition, the second mounting hole is a long hole, which can absorb assembly errors and prevent stress concentration after assembly. An equipotential connection point is set between the shell side beam and the liquid cooling plate, and the equipotential connection point is arranged at the end of the shell side beam, which can not only realize the equipotential connection between the shell side beam and the liquid cooling plate, but also facilitate the installation operation of the equipotential point. The equipotential connection adopts a through hole that runs through the shell side beam and the liquid cooling plate, and a blind rivet provided in the through hole, so that the rivet head of the blind rivet is crimped on the shell side beam, and the flange surface of the blind rivet is riveted to the liquid cooling plate. It has a simple structure and reliable connection.

[0020] Another object of the present invention is to provide a battery pack, in which the battery pack is provided with the equipotential connection structure of the battery pack shell as described above.

[0021] The battery pack of the utility model, by adopting the above-mentioned equipotential connection structure of the battery pack shell, can not only ensure the reliability of equipotential electrical connection, but also help to reduce manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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:

[0023] Figure 1 It is a structural schematic diagram of the equipotential structure application state of the battery pack housing according to an embodiment of the utility model;

[0024] Figure 2 It is a partial enlarged view of the application state of the equipotential structure of the battery pack housing according to the embodiment of the utility model;

[0025] Figure 3 This is a structural schematic diagram of the first conductive bracket and the second conductive bracket in a coordinated state according to an embodiment of the utility model;

[0026] Figure 4 A cross-sectional view of the first conductive bracket and the second conductive bracket in a matching state according to an embodiment of the utility model;

[0027] Figure 5 This is a schematic structural diagram of the equipotential point between the shell side beam and the liquid cooling plate according to an embodiment of the utility model;

[0028] Figure 6 It is a cross-sectional view of the equipotential point between the shell side beam and the liquid cooling plate according to the embodiment of the utility model;

[0029] Description of reference numerals:

[0030] 1. Battery pack lower shell; 2. Liquid cooling plate; 3. First conductive bracket; 4. Second conductive bracket; 5. Pull rivet nut; 6. Bolt; 7. Blind rivet;

[0031] 101. Shell side beam; 102. Shell cross beam; 301. Arched portion; 302. Connecting end; 3011. First mounting hole; 401. Horizontal plate; 402. Vertical plate; 4011. Second mounting hole; 10. Shielded area. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0036] Embodiment 1

[0037] The present embodiment relates to an equipotential connection structure of a battery pack shell, which can ensure the reliability of equipotential connection and help reduce manufacturing costs.

[0038] In terms of overall composition, Figure 1 and Figure 2 As shown, the equipotential connection structure of the battery pack shell (hereinafter referred to as the equipotential connection structure) of this embodiment is provided between the battery pack shell and the liquid cooling plate 2, and the equipotential connection structure includes a first conductive bracket 3 and a second conductive bracket 4 connected to each other. The first conductive bracket 3 is connected to the liquid cooling plate 2, and the second conductive bracket 4 is connected to the shell cross beam 102 in the battery pack shell. The first conductive bracket 3 and the second conductive bracket 4 constitute an equipotential connection between the shell cross beam 102 and the liquid cooling plate 2.

[0039] At this time, by providing the first conductive bracket 3 and the second conductive bracket 4 connected to each other, and making the first conductive bracket 3 and the second conductive bracket 4 respectively connected to the liquid cooling plate 2 and the shell beam 102, thereby, the equipotential connection between the shell beam 102 and the liquid cooling plate 2 can be achieved, and because the shell beam 102 is connected to the battery pack shell, the equipotential connection between the battery pack shell and the liquid cooling plate 2 is achieved, and the reliability of the equipotential electrical connection can be guaranteed, and it is easy to install and connect. At the same time, compared with high-demand assembly or welding methods, it is also beneficial to reduce manufacturing costs.

[0040] In detail, combined with Figures 1 to 4 As shown, in this embodiment, the lower shell 1 of the battery pack includes a plurality of shell side beams 101, which are connected end to end and surround a frame, and a shell cross beam 102 connected between two relative shell side beams 101 is provided in the frame. The plurality of shell side beams 101 and the shell cross beam 102 are both roll-formed by steel plates. The liquid cooling plate 2 is arranged at the bottom of the lower shell 1 of the battery pack, and is fixedly connected to the plurality of shell side beams 101 and the shell cross beam 102.

[0041] As a preferred implementation, in this embodiment, see Figures 2 to 4 As shown, the first conductive bracket 3 is in the shape of a Chinese character "J", and has an arched portion 301 and connecting ends 302 disposed on both sides of the arched portion 301. The arched portion 301 is connected to the second conductive bracket 4, and the connecting ends 302 are welded and fixedly connected to the liquid cooling plate 2. At this time, the first conductive bracket 3 adopts a structural design of a Chinese character "J", which, on the one hand, makes the structure simple, easy to manufacture and low in cost, and can use the Chinese character "J" structure to increase the structural strength of the first conductive bracket 3, and on the other hand, it is convenient to improve the connection between the first conductive bracket 3 and the liquid cooling plate 2 and the second conductive bracket 4.

[0042] Also as a preferred embodiment, in this embodiment, the second conductive bracket 4 is "L" shaped, and has a horizontal plate 401 and a vertical plate 402 connected together. Among them, the horizontal plate 401 is connected to the first conductive bracket 3, and the vertical plate 402 is connected to the shell cross beam 102. By designing the second conductive bracket 4 into an "L" shaped structure, it also has the characteristics of simple structure, easy processing and manufacturing, and low cost, and the "L" shaped design structure is also convenient for the connection of the second conductive bracket 4 with the first conductive bracket 3 and the shell cross beam 102, and can absorb certain assembly errors.

[0043] In specific implementation, the connection ends 302 at both ends of the first conductive bracket 3 are preferably connected to the liquid cooling plate 2 by brazing. The horizontal plate 401 and the vertical plate 402 in the second conductive bracket 4 are respectively connected to the first conductive bracket 3 and the shell cross beam 102, that is, the horizontal plate 401 is connected to the arched portion 301, and the vertical plate 402 is connected to the shell cross beam 102. At this time, the cooperation of the "J"-shaped first conductive bracket 3 and the "L"-shaped second conductive bracket 4 can not only improve the structural strength of the equipotential connection structure, but also absorb assembly errors, facilitate installation operations, and also ensure the reliability of electrical connection.

[0044] Continue to view Figures 2 to 4 As shown, in this embodiment, the first conductive bracket 3 and the second conductive bracket 4 are detachably connected. In this way, the first conductive bracket 3 and the second conductive bracket 4 are prepared separately, the structure is simple, the manufacturing cost is low, and the assembly of the first conductive bracket 3 and the second conductive bracket 4 is also convenient.

[0045] Specifically, the first conductive bracket 3 is provided with a first mounting hole 3011, and the second conductive bracket 4 is provided with a second mounting hole 4011. A rivet nut 5 is provided on one of the first mounting hole 3011 and the second mounting hole 4011, and the first conductive bracket 3 and the second conductive bracket 4 are screwed and connected with the rivet nut 5 by a bolt 6 penetrated through the other of the first mounting hole 3011 and the second mounting hole 4011. In specific implementation, the first mounting hole 3011 is provided on the arched portion 301, and the second mounting hole 4011 is provided on the horizontal plate body 401. The rivet nut 5 is provided in the first mounting hole 3011, and the first conductive bracket 3 and the second conductive bracket 4 are connected together by the screwing cooperation of the bolt 6 penetrated through the second mounting hole 4011 and the rivet nut 5.

[0046] It should be noted that the positions of the rivet nut 5 and the bolt 6 can be interchanged, so that the first conductive bracket 3 and the second conductive bracket 4 can be screwed together. Of course, it is understandable that the first conductive bracket 3 and the second conductive bracket 4 can be connected by plugging or clamping in addition to being screwed together, which is also possible.

[0047] As a further preferred embodiment, in this embodiment, the second mounting hole 4011 is a long hole, and the long axis of the long hole extends in the direction from the first conductive bracket 3 to the housing cross beam 102. The second mounting hole 4011 is set as a long hole, which can absorb assembly errors and prevent stress concentration after assembly.

[0048] In this embodiment, a rivet nut 5 is also provided on the housing cross beam 102, and the vertical plate 402 is screwed to the rivet nut 5 by means of a bolt 6. At this time, the vertical plate 402 and the housing cross beam 102 are preferably screwed together by means of a rivet nut 5 and a bolt 6, which is simple in structure and reliable in connection.

[0049] It is worth noting that the first conductive bracket 3 and the second conductive bracket 4 of the present embodiment are preferably made of aluminum, and more preferably of three-series aluminum, which has low cost, good conductivity and excellent corrosion resistance.

[0050] On the basis of providing the first conductive support 3 and the second conductive support 4, in this embodiment, see Figure 5 and Figure 6 As shown, an equipotential connection point is provided between the shell side beam 101 of the battery pack shell and the liquid cooling plate 2, and the equipotential point is located at the end of the shell side beam 101. At this time, the equipotential connection point is arranged at the end of the shell side beam 101, which not only realizes the equipotential connection between the shell side beam 101 and the liquid cooling plate 2, but also facilitates the installation operation of the equipotential point.

[0051] Specifically, the equipotential connection point includes a through hole that passes through the shell side beam 101 and the liquid cooling plate 2, and a blind rivet 7 arranged in the through hole. Among them, the rivet head of the blind rivet 7 is crimped on the shell side beam 101, and the flange surface of the blind rivet 7 is riveted to the liquid cooling plate 2. In the specific implementation, the lower shell 1 of the battery pack needs to be electrophoretically treated, that is, the shell side beam 101 needs to be electrophoretically treated. At this time, the through hole set on the shell side beam 101 needs to be shielded for electrophoresis. After the electrophoresis is completed, the shielding material is torn off, and the shielding area 10 is coated with conductive paint, wherein the diameter of the shielding area 10 can be set to 12 mm, for example, and it is arranged concentrically with the through hole. In addition, the surface of the blind rivet 7 is treated with zinc-nickel coating to prevent corrosion.

[0052] After the blind rivet 7 is stripped, a bidirectional extrusion force is generated, and the rivet head is squeezed and expanded by the core body, and then press-fitted with the through hole on the shell side beam 101, and the flange surface of the blind rivet 7 is riveted and connected with the liquid cooling plate 2. After riveting, sealant is applied on the conductive paint to isolate the external environment, so that the equipotential connection between the cold plate and the shell side beam 101 is achieved through the blind rivet 7, and the corrosion problem caused by the destruction of the electrophoretic layer after the shell side beam 101 is rigidly connected to the metal part can be avoided.

[0053] The equipotential connection structure of this embodiment can not only ensure the reliability of the equipotential connection between the battery pack shell and the liquid cooling plate 2, but also facilitate installation and connection. Compared with high-demand assembly or welding methods, it is also conducive to reducing manufacturing costs and has a good use effect.

[0054] Embodiment 2

[0055] The present embodiment relates to a battery pack, in which the equipotential connection structure of the battery pack shell of the first embodiment is provided.

[0056] The battery pack of this embodiment, by adopting the above-mentioned equipotential connection structure of the battery pack shell, can not only ensure the reliability of equipotential electrical connection, but also help to reduce manufacturing costs, thereby helping to improve the reliability of the battery pack.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An equipotential connection structure of a battery pack housing, characterized in that: The equipotential connection structure is arranged between the battery pack shell and the liquid cooling plate, and the equipotential connection structure includes a first conductive bracket and a second conductive bracket connected to the liquid cooling plate, the first conductive bracket is connected to the liquid cooling plate, and the second conductive bracket is connected to the shell beam inside the battery pack shell, and the first conductive bracket and the second conductive bracket constitute an equipotential connection between the shell beam and the liquid cooling plate.

2. The equipotential connection structure of the battery pack shell according to claim 1, characterized in that: The first conductive bracket is in a "J" shape and has an arched portion and connecting ends disposed on both sides of the arched portion; The arched portion is connected to the second conductive bracket, and the connecting end is welded and fixedly connected to the liquid cooling plate.

3. The equipotential connection structure of the battery pack shell according to claim 1, characterized in that: The second conductive bracket is in an "L" shape and has a horizontal plate body and a vertical plate body connected together; The horizontal plate is connected to the first conductive bracket, and the vertical plate is connected to the shell crossbeam.

4. The equipotential connection structure of the battery pack shell according to claim 3, characterized in that: The shell cross beam is provided with a rivet nut, and the vertical plate is screwed to the rivet nut through bolts.

5. The equipotential connection structure of the battery pack shell according to claim 1, characterized in that: The first conductive bracket and the second conductive bracket are detachably connected.

6. The equipotential connection structure of the battery pack shell according to claim 5, characterized in that: The first conductive bracket is provided with a first mounting hole, and the second conductive bracket is provided with a second mounting hole; A rivet nut is provided on one of the first mounting hole and the second mounting hole, and the first conductive bracket and the second conductive bracket are threadedly connected to the rivet nut via bolts penetrating the other of the first mounting hole and the second mounting hole.

7. The equipotential connection structure of the battery pack shell according to claim 6, characterized in that: The second mounting hole is an elongated hole, and the major axis of the elongated hole extends in a direction from the first conductive bracket to the housing cross beam.

8. The equipotential connection structure of the battery pack shell according to claim 1, characterized in that: An equipotential connection point is provided between the shell side beam of the battery pack shell and the liquid cooling plate; The equipotential point is located at the end of the shell side beam.

9. The equipotential connection structure of the battery pack shell according to claim 8, characterized in that: The equipotential connection point includes a through hole penetrating the shell side beam and the liquid cooling plate, and a blind rivet arranged in the through hole; The rivet head of the blind rivet is pressed onto the shell side beam, and the flange surface of the blind rivet is riveted to the liquid cooling plate.

10. A battery pack, characterized in that: The battery pack is provided with the equipotential connection structure of the battery pack shell according to any one of claims 1 to 9.

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