Copper bar fixing structure and battery pack

Abstract

The utility model provides a copper bar fixing structure and a battery pack. The copper bar fixing structure comprises a first copper bar, a second copper bar and a fixing assembly. Wherein the first copper bar is electrically connected with the battery module, and the thickness direction of the first copper bar is parallel to the horizontal direction; the second copper bar is electrically connected with the battery module, the thickness direction of the second copper bar is parallel to the horizontal direction, and the second copper bar and the first copper bar are attached and insulated from each other; and the fixing assembly sleeves the first copper bar and the second copper bar and is used for fixing relative positions among the first copper bar, the second copper bar and the battery module. According to the utility model, the width of the copper bar is not limited by the size of the gap of the battery cell module, and the copper bar is supported in a balanced and stable manner.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage devices, in particular to a copper row fixing structure. The utility model also relates to a battery pack including the above copper row fixing structure. Background Technique

[0002] With the rapid development and wide application of new energy vehicle technologies, the battery pack, as one of the most important components affecting the performance of new energy vehicles, the supporting production and manufacturing technologies have also reached a new height. A battery pack is an energy storage device composed of multiple battery cell units. In the battery pack, the wire harness copper row connects all the battery cell units in series or parallel, so as to conduct current and exchange energy with the outside world. Therefore, when arranging the copper row in the battery pack, there are often long copper rows running through the entire battery pack.

[0003] Without a reasonable fixing structure, when the vehicle is driving on a road section with complex road conditions, the long copper row is very likely to rub against the battery cell module, thus generating potential safety hazards. At present, the long copper row is generally placed flat on the crossbeam in the gap between the battery cell modules, and then fixed with cable ties. This fixing structure is relatively simple, but the width of the copper row is limited by the size of the gap between the battery cell modules, and it is not suitable for copper rows with a larger cross-sectional area.

[0004] In the prior art, there is a related literature reporting a scheme of arranging the copper row longitudinally, which arranges the copper row vertically between the battery cell modules to get rid of the limitation of the width of the copper row by the gap between the battery cell modules. However, the contact area between the copper row adopting this fixing structure and the cable tie is small, and the vertically placed copper row cannot be stably supported only by the cable tie. Therefore, the copper row adopting this fixing structure has the defect of poor stability. Content of the Utility Model

[0005] In view of this, the utility model aims to propose a copper row fixing structure, which can make the width of the copper row not be limited by the size of the gap between the battery cell modules and stably support the copper row in a balanced manner.

[0006] To achieve the above object, the technical solution of the utility model is realized as follows:

[0007] A copper row fixing structure of the utility model includes a first copper row, which is electrically connected to the battery module and is arranged with its thickness direction parallel to the horizontal direction;

[0008] A second copper row, which is electrically connected to the battery module and is arranged with its thickness direction parallel to the horizontal direction, and the second copper row is attached to the first copper row and is insulated from each other;

[0009] A fixing component, sleeved on the first copper bar and the second copper bar, for fixing the relative positions among the first copper bar, the second copper bar and the battery module.

[0010] Furthermore, an insulating layer is provided between the first copper bar and the second copper bar.

[0011] Furthermore, the insulating layer is an epoxy board, and the area of the insulating layer is the same as and directly opposite to the smaller one of the contact side areas of the first copper bar and the second copper bar.

[0012] Furthermore, the fixing component includes a threaded pin, the top of which abuts against the bottoms of the first copper bar and the second copper bar.

[0013] A cable tie, configured to be sleeved in a ring shape outside the first copper bar and the second copper bar.

[0014] The cable tie is threaded through the threaded pin for fixing the relative positions among the first copper bar, the second copper bar and the threaded pin.

[0015] Furthermore, the fixing component further includes a compensating member, which is arranged on the top of the one with the smaller width among the first copper bar and the second copper bar, and the top surface of the compensating member is coplanar with the top surface of the one with the larger width among the first copper bar and the second copper bar.

[0016] Furthermore, at least part of the compensating member is made of a flexible material.

[0017] Furthermore, the bottoms of the first copper bar and the second copper bar are arranged coplanarly.

[0018] Furthermore, the top of the threaded pin extends symmetrically to both sides to form an extension part.

[0019] Furthermore, the positions where the fixing component is arranged on the first copper bar and the second copper bar are externally coated with a protective layer, and the protective layer is a cloth-based tape.

[0020] Compared with the prior art, the present utility model has the following advantages:

[0021] The copper bar fixing structure described in the present utility model realizes the basic functions of current conduction and electrical energy transmission of the copper bar by electrically connecting the first copper bar with the second copper bar and the battery cell module; the arrangement of the first copper bar and the second copper bar enables the width of the copper bar to be no longer limited by the distance between the battery cell modules, and the structure in which the first copper bar and the second copper bar are mutually attached increases the contact area between the first copper bar, the second copper bar and the fixing component, enabling the fixing component to achieve balanced and stable support for the copper bar, thus achieving the invention purpose of making the width of the copper bar not limited by the size of the gap between the battery cell modules and achieving balanced and stable support for the copper bar.

[0022] In addition, by providing an insulating layer between the first copper bar and the second copper bar, on the one hand, it can cooperate with the insulating paint on the outside of the copper bar itself to achieve a better insulating effect between the first copper bar and the second copper bar, reduce the possibility of short circuit between the battery cell modules, and improve the overall electrical safety of the battery pack; on the other hand, it can increase the distance between the first copper bar and the second copper bar, improve the phenomenon of local heat accumulation and overhigh temperature on the contact surface between the first copper bar and the second copper bar, and is beneficial to improving the overall service life of the battery pack.

[0023] By setting the insulating layer as a thin epoxy board, it can have better thermal conductivity and heat dissipation performance compared with other polymer materials on the premise of meeting the required insulating performance between the first copper bar and the second copper bar. By setting the area of the insulating layer to be equal to the area of the smaller side area of the first cold plate and the second cold plate and facing each other, it can minimize the amount of epoxy board used and the space occupied in the battery pack, which is beneficial to improving the energy density of the battery pack and reducing the production cost of the battery pack.

[0024] Secondly, by setting the fixing component as a combination of a cable tie and a threaded pin, the top of the threaded pin therein can achieve stable support for the bottom of the first copper bar and the second copper bar. The cable tie can not only fix the relative positions of the first copper bar and the second copper bar, but also form a relatively fixed whole with the threaded pin and the copper bar. The threaded part at the bottom of the threaded pin can be inserted into the corresponding installation hole, ensuring the attitude stability of the first copper bar and the second copper bar, and being beneficial to avoiding the situation of shaking of the first copper bar and the second copper bar.

[0025] By introducing a compensating part in the fixing component and making the bottom surface of the compensating part fit the top surface of the copper bar with a smaller width and the top surface of the compensating part fit the top surface of the copper bar with a larger width, the compensating part can compensate for the width difference between the two copper bars and fill the gap formed due to the width difference after the two copper bars are attached, thereby increasing the stability of the bundling effect of the cable tie on the first copper bar and the second copper bar and achieving the invention purpose of further improving the attitude stability of the copper bar.

[0026] By setting the compensating member as a cuboid block made of at least partially flexible material, the frictional loss between the cable tie and the compensating member can be effectively reduced, which is beneficial to avoiding the situation of the cable tie breaking, and effectively extends the service life of the cable tie.

[0027] Furthermore, by coplanarly arranging the bottoms of the first copper row and the second copper row, the first copper row and the second copper row are located in the same horizontal plane, so that the contact surfaces of the first copper row and the second copper row with the threaded pin in the fixing assembly are flat surfaces, effectively increasing the contact area between the top of the threaded pin and the bottoms of the first copper row and the second copper row; by symmetrically extending and forming an extension part at the top of the threaded pin, the contact area between the threaded pin and the first copper row and the second copper row can be further increased, thus achieving the invention purpose of further improving the attitude stability of the copper row.

[0028] By covering and arranging cloth-based tape at the parts of the first copper row and the second copper row where the fixing assembly is provided, a protective layer can be formed on the first copper row and the second copper row, effectively avoiding the cable tie from directly contacting and wearing the insulating paint on the surfaces of the first copper row and the second copper row during the vehicle driving process, thereby achieving the purpose of extending the service life of the battery pack.

[0029] In addition, the present utility model also proposes a battery pack provided with the above copper row fixing structure.

[0030] The battery pack described in the present utility model has the same beneficial effects as the above copper row fixing structure compared with the prior art, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0032] Figure 1 is a schematic structural diagram of the copper row fixing structure in the embodiment of the present utility model;

[0033] Figure 2 is an exploded structural diagram of the fixing assembly in the embodiment of the present utility model;

[0034] Description of the reference numerals:

[0035] 1, the first copper row;

[0036] 2, the second copper row;

[0037] 3, the fixing assembly;

[0038] 301, the threaded pin; 302, the cable tie; 303, the compensating member; 3011, the extension part;

[0039] 4. Insulating layer. Detailed implementation manners

[0040] It should be noted that, without conflict, the embodiments and features in the embodiments of the present utility model can be combined with each other. In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will describe the specific implementation manners of the present utility model with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other implementation manners can also be obtained.

[0041] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model 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, so it cannot be understood as a limitation to the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] Taking a copper bar fixing structure and a battery pack described in the present utility model as an example, the orientation terms such as "upper, lower, left, right, front, and back" used in the embodiments 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) of the battery pack. "Inner" and "outer" are defined based on the contour of the corresponding component. For example, "inner" and "outer" defined based on the contour of the battery pack, the side close to the middle of the battery pack is "inner", and vice versa is "outer".

[0043] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connecting member" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0044] The following will refer to the attached Figure 1 and the attached Figure 2 and combine with the embodiments to detail the present utility model.

[0045] Embodiment 1

[0046] This embodiment relates to a copper bar fixing structure. By making two copper bars fit together with their thickness directions arranged horizontally, their width directions are arranged longitudinally along the gap of the battery cell module. Then, a fixing component is used to fix and limit the relative positions among the first copper bar, the second copper bar, and the battery cell module, thus achieving the invention purpose of making the width of the copper bar unrestricted by the size of the battery cell module gap and providing balanced and stable support for the copper bar.

[0047] In terms of the overall structure, the copper bar fixing structure of this embodiment includes a first copper bar 1, a second copper bar 2, and a fixing component 3. Among them, the first copper bar 1 is electrically connected to the battery cell module of the battery pack to achieve current conduction. The first copper bar 1 is arranged with its thickness direction along the horizontal direction, that is, its width direction along the vertical direction of the battery cell module gap. The second copper bar 2 is electrically connected to the battery cell module of the battery pack to achieve current conduction. The second copper bar 2 is arranged with its thickness direction along the horizontal direction, that is, its width direction along the vertical direction of the battery cell module gap. The fixing component 3 is sleeved on the first copper bar 1 and the second copper bar 2 to fix the positions among the first copper bar 1, the second copper bar 2, and the battery cell module. The fixing component 3 can be arranged as multiple distributed along the length direction of the first copper bar 1 to achieve better fixing structure strength and stability.

[0048] With the above settings, by electrically connecting the first copper bar 1, the second copper bar 2, and the battery cell module, the basic functions of current conduction and electrical energy transmission of the copper bar are achieved; the arrangement of the first copper bar 1 and the second copper bar 2 makes the width of the copper bar no longer restricted by the distance between the battery cell modules. The structure where the first copper bar 1 and the second copper bar 2 fit together increases the contact area between the first copper bar 1, the second copper bar 2, and the fixing component 3, enabling the fixing component 3 to provide balanced and stable support for the copper bar, thus achieving the invention purpose of making the width of the copper bar unrestricted by the size of the battery cell module gap and providing balanced and stable support for the copper bar.

[0049] Based on the above design concept, specifically, in this embodiment, referring to Figure 1 , an insulating layer 4 is provided between the first copper bar 1 and the second copper bar 2. Two sides of the insulating layer 4 are respectively attached to one side surface of the first copper bar 1 and one side surface of the second copper bar 2 and are bonded by a thermally conductive structural adhesive.

[0050] By providing an insulating layer 4 between the first copper busbar 1 and the second copper busbar 2, on the one hand, it can cooperate with the insulating paint on the outside of the copper busbar itself to achieve a better insulating effect between the first copper busbar 1 and the second copper busbar 2, reduce the possibility of short circuit between the battery cell modules, and improve the overall electrical safety of the battery pack; on the other hand, it can increase the distance between the first copper busbar 1 and the second copper busbar 2, improve the phenomenon of local heat accumulation and overheating at the contact surface between the first copper busbar 1 and the second copper busbar 2, and is beneficial to improving the overall service life of the battery pack.

[0051] In order to enable the insulating layer 4 to play a better role, in this embodiment, referring to Figure 1 , the insulating layer 4 can be a thin rectangular epoxy board. The edges of the insulating layer 4 are rounded, which is beneficial to eliminating the bonding stress and reducing the possibility of the board cracking. The area of the insulating layer 4 is equal to the smaller one of the side areas of the first copper busbar 1 and the second copper busbar 2, and is arranged opposite to each other.

[0052] By setting the insulating layer 4 as a thin epoxy board, it can have better thermal conductivity and heat dissipation performance compared with other polymer materials on the premise of meeting the required insulation performance between the first copper busbar 1 and the second copper busbar 2. By setting the area of the insulating layer 4 to be equal to and opposite to the smaller one of the side areas of the first cold plate and the second cold plate, the amount of epoxy board used and the space occupied in the battery pack can be minimized, which is beneficial to improving the energy density of the battery pack and reducing the production cost of the battery pack.

[0053] Referring to Figure 1 and Figure 2 , for the purpose of firmly supporting the copper busbar, in this embodiment, the fixing component 3 includes a threaded pin 301 and a cable tie 302. Among them, the threaded pin 301 is arranged at the bottom of the first copper busbar 1 and the second copper busbar 2, and the top of the threaded pin 301 abuts against the lower surfaces of the first copper busbar 1 and the second copper busbar 2. The cable tie 302 is configured as a ring sleeved outside the first copper busbar 1 and the second copper busbar 2. At the same time, the cable tie 302 passes through the top of the threaded pin 301 to fix the threaded pin 301, the first copper busbar 1 and the second copper busbar into a whole. The cable tie 302 can be divided into a belt body for tying and a fixing frame for fixing the belt body. One side of the belt body is provided with sawteeth. When one end of the belt body passes through the fixing frame, the sawteeth inside the fixing frame mesh with the sawteeth on one side of the belt body to achieve locking and fixing of the belt body.

[0054] By setting the fixing component 3 as a combination of a cable tie 302 and a threaded pin 301, the top of the threaded pin 301 can stably support the bottoms of the first copper bar 1 and the second copper bar 2. The cable tie 302 can not only fix the relative positions of the first copper bar 1 and the second copper bar 2, but also form a relatively fixed whole with the threaded pin 301 and the copper bars. The threaded part at the bottom of the threaded pin 301 can be inserted into the corresponding mounting hole, ensuring the attitude stability of the first copper bar 1 and the second copper bar 2, and facilitating the avoidance of the situation where the first copper bar 1 and the second copper bar 2 shake.

[0055] Referring to Figure 1 and Figure 2 , in order to further improve the attitude stability of the copper bars, in this embodiment, the fixing component 3 further includes a compensating member 303. The compensating member 303 is a cuboid block structure. The compensating member 303 is fixedly installed on the top surface of the narrower one of the first copper bar 1 and the second copper bar 2. In addition, the top surface of the compensating member 303 is coplanar with the top surface of the wider one of the first copper bar 1 and the second copper bar 2.

[0056] By introducing the compensating member 303 into the fixing component 3, and making the bottom surface of the compensating member 303 fit the top surface of the narrower copper bar and the top surface of the compensating member 303 fit the top surface of the wider copper bar, the compensating member 303 can compensate for the width difference between the two copper bars and fill the gap formed due to the width difference after the two copper bars are fitted, thereby increasing the stability of the bundling effect of the cable tie 302 on the first copper bar 1 and the second copper bar 2, and achieving the invention purpose of further improving the attitude stability of the copper bars.

[0057] Referring to Figure 1 and Figure 2 , for the purpose of improving the overall service life of the battery pack, in this embodiment, at least part of the compensating member 303 is made of a flexible material. The compensating member 303 can be a cuboid block made of rubber material or a cuboid block made of polymer material with a flexible surface layer.

[0058] By setting the compensating member 303 as a cuboid block made of at least part of a flexible material, the frictional loss between the cable tie 302 and the compensating member 303 can be effectively reduced, which is beneficial to avoiding the situation where the cable tie 302 breaks and effectively prolongs the service life of the cable tie 302.

[0059] Referring to Figure 1 and Figure 2, in order to further improve the attitude stability of the copper busbars, in this embodiment, the bottom surfaces of the first copper busbar 1 and the second copper busbar 2 are coplanar, and the bottom surfaces of the first copper busbar 1 and the second copper busbar 2 are in the same horizontal plane. On both sides of the top of the threaded pin 301, extensions 3011 extend symmetrically away from the geometric center of the threaded pin 301. The extensions 3011 are symmetric about the center of the threaded pin 301 and abut against the lower surfaces of the first copper busbar 1 and the second copper busbar 2.

[0060] By arranging the bottoms of the first copper busbar 1 and the second copper busbar 2 to be coplanar, the first copper busbar 1 and the second copper busbar 2 are in the same horizontal plane, so that the contact surfaces between the first copper busbar 1 and the second copper busbar 2 and the threaded pin 301 in the fixing assembly 3 are flat surfaces, effectively increasing the contact area between the top of the threaded pin 301 and the bottoms of the first copper busbar 1 and the second copper busbar 2; by symmetrically extending the extensions 3011 at the top of the threaded pin 301, the contact area between the threaded pin 301 and the first copper busbar 1 and the second copper busbar 2 can be further increased, thus achieving the invention purpose of further improving the attitude stability of the copper busbars.

[0061] For the purpose of extending the service life of the battery pack, in this embodiment, the parts of the first copper busbar 1 and the second copper busbar 2 where the fixing assembly 3 is provided are coated with a protective layer. The protective layer can be cloth-based tape.

[0062] By coating the cloth-based tape on the parts of the first copper busbar 1 and the second copper busbar 2 where the fixing assembly 3 is provided, a protective layer can be formed on the first copper busbar 1 and the second copper busbar 2, effectively preventing the cable tie 302 from directly contacting and wearing the insulating paint film on the surfaces of the first copper busbar 1 and the second copper busbar 2 during vehicle driving, thereby achieving the purpose of extending the service life of the battery pack.

[0063] Embodiment 2

[0064] This embodiment relates to a battery pack, including the copper busbar fixing structure described in Embodiment 1.

[0065] In this embodiment, by arranging the copper busbar fixing structure described in Embodiment 1, the width of the copper busbar is no longer limited by the gap size of the battery cells in the battery pack. In addition, the copper busbar can be well fixed in the battery pack, making it have good load-bearing capacity and attitude stability.

[0066] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A copper busbar fixing structure, characterized in that: It includes a first copper bar, which is electrically connected to the battery module and is arranged so that the thickness direction is parallel to the horizontal direction; A second copper bar is electrically connected to the battery module and is arranged so that the thickness direction is parallel to the horizontal direction, and the second copper bar is attached to the first copper bar and insulated from each other; The fixing assembly is sleeved on the first copper bar and the second copper bar, and is used to fix the relative positions between the first copper bar, the second copper bar and the battery module.

2. The copper busbar fixing structure according to claim 1, characterized in that: An insulating layer is disposed between the first copper bar and the second copper bar.

3. The copper busbar fixing structure according to claim 2 is characterized in that: The insulating layer is an epoxy board, and the area of ​​the insulating layer is consistent with the smaller contact side area of ​​the first copper bar and the second copper bar, and they are opposite to each other.

4. The copper busbar fixing structure according to claim 1, characterized in that: The fixing assembly includes a threaded pin, the top of which abuts against the bottom of the first copper bar and the second copper bar; A cable tie is configured to be in a ring shape and sleeved on the outside of the first copper bar and the second copper bar; The cable tie is passed through the threaded pin and is used to fix the relative positions of the first copper bar, the second copper bar and the threaded pin.

5. The copper busbar fixing structure according to claim 4, characterized in that: The fixing assembly further includes a compensating member, which is disposed on the top of the smaller one of the first copper bar and the second copper bar, and a top surface of the compensating member is coplanar with a top surface of the larger one of the first copper bar and the second copper bar.

6. The copper busbar fixing structure according to claim 5, characterized in that: At least part of the compensating member is made of a flexible material.

7. The copper busbar fixing structure according to claim 4, characterized in that: The bottoms of the first copper bar and the second copper bar are arranged coplanarly.

8. The copper busbar fixing structure according to claim 7, characterized in that: The top of the threaded pin extends symmetrically to both sides to form an extension portion.

9. The copper busbar fixing structure according to claim 1, characterized in that: The outside of the first copper busbar and the second copper busbar where the fixing components are arranged is covered with a protective layer, and the protective layer is a cloth-based tape.

10. A battery pack, characterized in that: It comprises a copper busbar fixing structure, wherein the copper busbar fixing structure is the copper busbar fixing structure according to any one of claims 1 to 9.

Images