Battery pack and vehicle

Abstract

The present application discloses a battery pack and a vehicle thereof, wherein the battery pack includes: a tray, the tray includes a bottom plate and a plurality of side beams arranged around the bottom plate, the bottom plate and the plurality of side beams enclose a receiving groove; a cell assembly, the cell assembly is arranged in the receiving groove, the cell assembly includes a plurality of electrically connected cells, and the cell assembly has a total electrode; a power lead-out part, the power lead-out part is connected to the total electrode, the power lead-out part is arranged between the cell assembly and the side beams, and is thermally connected to the side beams. The battery pack according to the embodiment of the present application can not only effectively and timely dissipate heat from the power lead-out part, but also prevent the heat of the power lead-out part from being transferred to the cell.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a battery pack and a vehicle thereof. Background Art

[0002] In the prior art, the main electrode of the battery pack usually needs to be led out by a power lead-out component, and the power lead-out component is directly arranged on the top of the battery cell. The heat dissipated by the power lead-out component is directly transferred to the battery cell, which will affect the temperature of the battery cell, causing the temperature of the battery cell to rise, causing adverse effects on the battery cell. Summary of the invention

[0003] One object of the present application is to provide a new technical solution for a battery pack.

[0004] Another object of the present application is to provide a new technical solution for a vehicle, which includes the battery pack.

[0005] According to the first aspect of the present application, a battery pack is provided, comprising: a tray, the tray comprising a bottom plate and a plurality of side beams arranged around the bottom plate, the bottom plate and the plurality of side beams enclosing a receiving groove; a battery cell assembly, the battery cell assembly being arranged in the receiving groove, the battery cell assembly comprising a plurality of electrically connected battery cells, the battery cell assembly having a total electrode; a power lead-out member, the power lead-out member being connected to the total electrode, the power lead-out member being arranged between the battery cell assembly and the side beams, and being thermally conductively connected to the side beams.

[0006] According to an embodiment of the present application, a heat-conducting adhesive is provided on a side of the power lead-out member facing the side beam, and the power lead-out member is connected to the side beam via the heat-conducting adhesive.

[0007] According to an embodiment of the present application, the battery pack further includes: a fixing bracket, wherein the fixing bracket is arranged between the power lead-out member and the battery cell assembly.

[0008] According to an embodiment of the present application, a mounting groove is provided on a side of the fixing bracket facing the side beam, and the power lead-out member is provided in the mounting groove.

[0009] According to an embodiment of the present application, a protrusion is provided on the side of the fixing bracket facing the side beam, a groove matching the protrusion is provided on the side beam, the protrusion is inserted into the groove, and the mounting groove is provided on the side of the protrusion facing the side beam.

[0010] According to an embodiment of the present application, the power lead-out member is abutted against or bonded to the bottom wall of the groove.

[0011] According to an embodiment of the present application, a plurality of the battery cells are arranged along a first direction to form a battery cell array, the first direction being the thickness direction of the battery cells, the fixed bracket being located on one side of the battery cell array along the first direction, and the fixed bracket respectively abuts against the side beam and the battery cell array.

[0012] According to an embodiment of the present application, the fixing bracket includes a first glass fiber layer, a foaming layer, and a second glass fiber layer stacked in sequence, the first glass fiber layer abuts against the battery cell array, and the second glass fiber layer abuts against the side beam.

[0013] According to an embodiment of the present application, the battery cell assembly includes a plurality of the battery cell arrays, which are arranged along a second direction and electrically connected, wherein the second direction is the length direction of the battery cell; the battery pack includes a plurality of the fixing brackets, which are located on one side of the core assembly, and the fixing brackets are arranged one-to-one with the battery cell arrays.

[0014] According to an embodiment of the present application, the total electrode includes a total positive electrode and a total negative electrode, the power lead-out member is a copper busbar and is connected to the total negative electrode, or the power lead-out member is an aluminum busbar and is connected to the total positive electrode.

[0015] According to an embodiment of the present application, a first bending portion is provided at one end of the power lead-out piece, and a second bending portion is provided at the other end of the power lead-out piece, the first bending portion is connected to the main electrode, and the second bending portion is used to connect to the distribution box.

[0016] According to a second aspect of the present application, a vehicle is provided, comprising a battery pack as described in any one of the above embodiments.

[0017] According to one embodiment of the present disclosure, the power lead-out member is disposed between the side beam and the battery cell assembly, and the power lead-out member is thermally connected to the side beam, so that the heat of the power lead-out member can be transferred to the tray. The battery pack of the present application can effectively and timely dissipate heat from the power lead-out member, and avoid the heat of the power lead-out member being transferred to the battery cell and causing adverse effects on the battery cell.

[0018] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0020] Figure 1 is a top view of a battery pack according to an embodiment of the present application;

[0021] Figure 2 is a partial exploded view of a battery pack according to an embodiment of the present application;

[0022] Figure 3 is a schematic diagram of the assembly of a tray, a power lead-out member, a thermally conductive adhesive and a fixing bracket according to an embodiment of the present application;

[0023] Figure 4 is a schematic diagram of the assembly of a power lead-out member and a fixing bracket according to an embodiment of the present application;

[0024] Figure 5 is a cross-sectional view of a fixing bracket according to an embodiment of the present application.

[0025] Reference numerals

[0026] Battery pack 100;

[0027] Tray 10; receiving groove 11; side beam 12; groove 121;

[0028] Battery cell assembly 20; Battery cell array 21; Battery cell 210;

[0029] Total negative electrode 22;

[0030] Total positive electrode 23;

[0031] Power lead-out member 30; first bending portion 31; second bending portion 32;

[0032] Thermal conductive adhesive 40;

[0033] Fixed bracket 50; mounting groove 51; first glass fiber layer 52; foaming layer 53; second glass fiber layer 54; protrusion 55;

[0034] Bottom plate 60. DETAILED DESCRIPTION

[0035] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0036] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0037] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0038] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0039] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0040] The battery pack 100 according to an embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0041] like Figures 1 to 5 As shown, the battery pack 100 according to the embodiment of the present application includes: a tray 10, a battery cell assembly 20 and a power lead-out member 30.

[0042] Specifically, the tray 10 includes a bottom plate 60 and a plurality of side beams 12 disposed around the bottom plate 60, and the bottom plate 60 and the plurality of side beams 12 enclose a receiving groove 11. The battery cell assembly 20 is disposed in the receiving groove 11, and the battery cell assembly 20 includes a plurality of electrically connected battery cells 210, and the battery cell assembly 20 has a total electrode. The power lead-out member 30 is connected to the total electrode, and the power lead-out member 30 is disposed between the battery cell assembly 20 and the side beam 12, and is thermally connected to the side beam 12.

[0043] It should be noted that the heat-conducting connection can be understood as the power lead-out member 30 abutting against the side beam 12, or the power lead-out member 30 and the side beam 12 being bonded, or a heat-conducting member being arranged between the power lead-out member 30 and the side beam 12, and the power lead-out member 30 being connected to the side beam via the heat-conducting member.

[0044] In other words, if Figure 3 As shown, the battery pack 100 according to the embodiment of the present application includes a tray 10 having a receiving slot 11, a battery cell assembly 20 composed of a plurality of battery cells 210, and a power lead-out member 30 for leading out the total electrode of the battery cell assembly 20. The tray 10 includes a bottom plate 60 and a plurality of side beams 12, the plurality of side beams 12 are connected to form a ring structure, and the bottom plate 60 and the plurality of side beams 12 are connected to form a receiving slot 11.

[0045] When the power lead-out member 30 generates heat, since the power lead-out member 30 is thermally connected to the side beam 12, the heat of the power lead-out member 30 can be transferred to the entire tray 10 via the side beam 12, and the tray 10 can conduct the heat to the outside. The tray 10 has a large area and can quickly dissipate the heat to prevent the heat from accumulating on the power lead-out member 30, thereby preventing the power lead-out member 30 from overheating, causing the heat to be transferred to the inside of the battery cell 210 and affecting the performance of the battery cell 210.

[0046] Therefore, according to the battery pack 100 of the embodiment of the present application, by arranging the power lead-out member 30 between the inner side of the tray 10 and the battery cell assembly 20, the power lead-out member 30 is thermally connected to the side beam 12, and the heat of the power lead-out member 30 can be transferred to the tray 10. The battery pack 100 of the present application can effectively and timely dissipate the heat of the power lead-out member 30, and avoid the heat of the power lead-out member 30 being transferred to the battery cell 210 and causing adverse effects on the battery cell 210.

[0047] According to an embodiment of the present application, a heat-conducting adhesive 40 is provided on a side of the power lead-out member 30 facing the side beam 12 , and the power lead-out member 30 is connected to the side beam 12 via the heat-conducting adhesive 40 .

[0048] That is, the heat conductive adhesive 40 is arranged between the power lead-out member 30 and the inner side surface of the side beam 12. When the heat conductive adhesive 40 is installed between the power lead-out member 30 and the inner side surface of the side beam 12, the first side of the heat conductive adhesive 40 faces the power lead-out member 30, and the second side of the heat conductive adhesive 40 faces the inner side surface of the side beam 12. The inner side surface of the side beam 12 refers to the surface of the side beam 12 located in the receiving groove 11. Figure 3 As shown, the first side of the thermal conductive adhesive 40 is in contact with the inner side of the side beam 12, and the second side of the thermal conductive adhesive 40 is in contact with the power lead-out member 30. When the power lead-out member 30 generates heat, the heat of the power lead-out member 30 can be transferred to the tray 10 via the thermal conductive adhesive 40, and the tray 10 can conduct the heat to the outside. In addition, the tray 10 has a large area, which can quickly dissipate the heat, prevent the heat from accumulating on the power lead-out member 30, and prevent the power lead-out member 30 from overheating, causing the heat to be transferred to the inside of the battery cell 210, affecting the performance of the battery cell 210.

[0049] According to one embodiment of the present application, the battery pack 100 further includes a fixing bracket 50 , which is disposed between the power lead-out member 30 and the battery cell assembly 20 .

[0050] That is to say, Figure 2 As shown, a fixing bracket 50 is further provided between the battery cell assembly 20 and the power lead-out member 30, and the power lead-out member 30 is provided on the fixing bracket 50. The length of the power lead-out member 30 may exceed the length of the fixing bracket 50, for example, both ends of the power lead-out member 30 respectively exceed the fixing bracket 50. One end of the power lead-out member 30 may be bent to one end of the battery cell assembly 20 and electrically connected to the main electrode. The other end of the power lead-out member 30 may be bent to the other end of the battery cell assembly 20.

[0051] Therefore, by setting a fixed bracket 50 between the battery cell assembly 20 and the power lead-out component 30, the fixed bracket 50 can not only support and install the power lead-out component 30, but also block the battery cell assembly 20 and the power lead-out component 30, further preventing the heat of the power lead-out component 30 from being transferred to the battery cell 210.

[0052] In some specific embodiments of the present application, a mounting groove 51 is provided on a side of the fixing bracket facing the side beam 12 , and the power lead-out member 30 is provided in the mounting groove 51 .

[0053] Specifically, a mounting groove 51 may be provided on one side of the fixing bracket 50 away from the battery cell assembly 20, and the mounting groove 51 extends along the length direction of the fixing bracket 50, and the mounting groove 51 is recessed toward the direction where the battery cell assembly 20 is located. By arranging the power lead-out member 30 in the mounting groove 51, not only the power lead-out member 30 can be supported, but also the installation position of the power lead-out member 30 can be positioned, which facilitates the installation of the power lead-out member 30, and can also reduce the size of the overall structure after installation, thereby reducing the size of the battery pack 100.

[0054] Among them, Figure 4 As shown, the thermal conductive adhesive 40 can also be arranged in the installation groove 51 and contact the power lead-out member 30. By arranging both the power lead-out member 30 and the thermal conductive adhesive 40 in the installation groove 51, it is not only convenient to install the power lead-out member 30 and the thermal conductive adhesive 40; it can also ensure that the thermal conductive adhesive 40 and the power lead-out member 30 are closely fitted, ensuring the maximum contact area, further improving the heat dissipation effect of the power lead-out member 30; and it can also reduce the size of the overall structure after installation, thereby reducing the size of the battery pack 100.

[0055] In some specific embodiments of the present application, the fixing bracket 50 may be a heat insulating member. That is, the fixing bracket 50 may be made of a heat insulating material. By using the fixing bracket 50 with a heat insulating effect, it is not only convenient to install the power lead-out member 30 and the heat conductive adhesive 40, but also can effectively isolate the heat of the power lead-out member 30 from being transferred to the battery cell 210.

[0056] According to one embodiment of the present application, a protrusion 55 is provided on the side of the fixing bracket 50 facing the side beam 12, a groove 121 adapted to the protrusion 55 is provided on the side beam 12, the protrusion 55 is inserted into the groove 121, and the mounting groove 51 is provided on the side of the protrusion 55 facing the side beam 12.

[0057] That is to say, a protrusion 55 is provided on one side of the fixing bracket 50, and the mounting groove 51 is provided on the protrusion 55. In addition, a groove 121 matching the protrusion 55 is provided on the side beam 12, and the groove 121 is recessed relative to the inner side surface of the side beam 12. When the fixing bracket 50 is installed in the tray 10, the protrusion 55 can be inserted into the groove 121, and the power lead-out member 30 can contact the bottom wall of the groove 121. Through the matching of the protrusion 55 and the groove 121, it is not only convenient to install the fixing bracket 50 in the groove 121, improving the installation firmness of the battery pack 100, but also the power lead-out member 30 in the mounting groove 51 can be in close contact with the side beam 12, further ensuring the heat dissipation effect.

[0058] According to an embodiment of the present application, the power lead-out member 30 is in contact with or bonded to the bottom wall of the groove 121. In other words, the power lead-out member 30 and the side beam 12 may be in contact with or bonded to each other.

[0059] According to an embodiment of the present application, a plurality of battery cells 210 are arranged along a first direction to form a battery cell array 21, the first direction being the thickness direction of the battery cells 210, the fixing bracket 50 is located on one side of the battery cell array 21 along the first direction, and the fixing bracket 50 is respectively in contact with the side beam 12 and the battery cell array 21. In this way, when the battery cells 210 in the battery cell array 21 expand along the thickness direction thereof, the fixing bracket 50 can restrict the expansion of the battery cells 210 to a certain extent, which is beneficial to improving the life of the battery cells 210, and can also prevent the expansion force of the battery cells 210 from causing damage to the power lead-out member 30.

[0060] In some specific embodiments of the present application, the fixed bracket 50 includes a first glass fiber layer 52, a foaming layer 53, and a second glass fiber layer 54 which are stacked in sequence, the first glass fiber layer abuts against the battery cell array 21, and the second glass fiber layer 54 abuts against the side beam 12. Among them, the density of the foaming layer 53 is lower than the density of the first glass fiber layer 52 and the second glass fiber layer 54, and has the characteristic of light weight, which can effectively reduce the total weight of the overall battery pack 100. In addition, the foaming layer 53 also has a honeycomb-like structure, that is, a hexagonal structure, through which the expansion force of the battery cell 210 can be effectively absorbed. Such a design is conducive to improving the structural strength of the fixed bracket 50, thereby better restraining the expansion of the battery cell 210.

[0061] Specifically, the fixing bracket 50 includes a foaming layer 53, a first glass fiber layer 52, and a second glass fiber layer 54, wherein the foaming layer 53 is disposed between the first glass fiber layer 52 and the second glass fiber layer 54. The first glass fiber layer 52 can be disposed toward the battery cell 210 and abut against the battery cell array 21, that is, the first glass fiber layer 52 can be disposed on the side of the fixing bracket 50 facing the battery cell 210. The second glass fiber layer 54 is disposed toward the side beam 12, that is, it can be formed on the side of the fixing bracket 50 with the mounting groove 51 and abut against the side beam 12.

[0062] Among them, glass fiber is an inorganic non-metallic material with excellent performance, and has the advantages of good insulation, strong heat resistance, good corrosion resistance and high mechanical strength. Therefore, the fixed bracket 50 made of glass fiber has high strength. When the battery core 210 expands in the thickness direction, the fixed bracket 50 with a glass fiber surface can effectively resist the expansion force of the battery core 210, protect the power lead-out part 30, and will not cause extrusion of the power lead-out part 30 due to the expansion of the battery core 210, or even cause poor conductivity and heat accumulation. The foaming layer 53 has good heat insulation effect and energy absorption effect. By arranging the foaming layer 53 between the first glass fiber layer 52 and the second glass fiber layer 54, the first glass fiber layer 52 and the second glass fiber layer 54 are mainly used as the outer surface of the fixed bracket 50, which has high strength. The core of the fixed bracket 50 is made of foaming material, which has good heat insulation effect. Therefore, by adopting this type of sandwich structure, the fixed bracket 50 has high strength and low weight while also having a good heat insulation effect. It can not only resist the expansion force of the battery cell 210, but also isolate the heat between the battery cell 210 and the power lead-out component 30, thereby preventing the power lead-out component 30 from transferring heat to the battery cell 210.

[0063] According to one embodiment of the present application, the battery cell assembly 20 includes a plurality of battery cell arrays 21, which are arranged and electrically connected along a second direction, wherein the second direction is the length direction of the battery cell 210. The battery pack includes a plurality of fixing brackets 50, which are located on one side of the battery cell assembly 20, and the fixing brackets are arranged one by one with the battery cell arrays 21.

[0064] That is, when the battery cell assembly 20 includes a plurality of battery cell arrays 21, the battery cell arrays 21 include a plurality of battery cells 210. The plurality of battery cells 210 in each battery cell array 21 are arranged in sequence along the first direction, and the plurality of battery cells 210 are electrically connected. The plurality of battery cell arrays 21 are arranged in sequence toward the second direction, and the plurality of battery cell arrays 21 are electrically connected. The second direction is perpendicular to the first direction.

[0065] In some specific embodiments of the present application, the total electrode includes a total positive electrode 23 and a total negative electrode 22 , and the power lead-out member 30 is a copper busbar connected to the total negative electrode 22 , or the power lead-out member 30 is an aluminum busbar connected to the total positive electrode 23 .

[0066] That is to say, the total electrode may include a total positive electrode 23 and a total negative electrode 22, and specifically, one end of a plurality of connected battery cell arrays 21 may form a total positive electrode 23, and the other end may form a total negative electrode 22. When one end of the power lead-out member 30 is connected to the total negative electrode 22, the power lead-out member 30 may be a copper busbar, which can lead out the total negative electrode 22. When one end of the power lead-out member 30 is connected to the total positive electrode 23, the power lead-out member 30 may be an aluminum busbar, which can lead out the total positive electrode 23.

[0067] According to one embodiment of the present application, a first bending portion 31 is provided at one end of the power lead-out member 30, and a second bending portion 32 is provided at the other end of the power lead-out member 30. The first bending portion 31 is connected to the main electrode, and the second bending portion 32 is used to connect to the distribution box.

[0068] That is, the first bent portion 31 can be connected to the total positive electrode 23 or the total negative electrode 22, and the second bent portion 32 can lead out the total positive electrode 23 or the total negative electrode 22 of the battery cell assembly 20 and connect it to the distribution box.

[0069] In summary, according to the battery pack 100 of the embodiment of the present application, the heat of the power lead-out part 30 can be transferred to the tray 10 via the thermal conductive adhesive 40. The fixing bracket 50 can also resist the expansion force of the battery cell 210, prevent the power lead-out part 30 from being squeezed, and also has a heat-insulating effect. According to the embodiment of the present application, a vehicle is also provided, which includes the battery pack 100 of any of the above-mentioned embodiments. Since the battery pack 100 according to the embodiment of the present application has the above-mentioned technical effects, the vehicle according to the embodiment of the present application also has the above-mentioned technical effects, and ultimately the battery system of the vehicle can be stably operated and the driving experience can be guaranteed.

[0070] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A battery pack, characterized in that: include: A tray, the tray comprising a bottom plate and a plurality of side beams arranged around the bottom plate, the bottom plate and the plurality of side beams enclosing a receiving groove; A battery cell assembly, the battery cell assembly is arranged in the receiving groove, the battery cell assembly includes a plurality of electrically connected battery cells, and the battery cell assembly has a main electrode; A power lead-out member, the power lead-out member is connected to the main electrode, the power lead-out member is disposed between the battery cell assembly and the side beam, and is thermally connected to the side beam; A fixing bracket, the fixing bracket is arranged between the power lead-out member and the battery core assembly; a mounting groove is provided on the side of the fixing bracket facing the side beam, a protrusion is provided on the side of the fixing bracket facing the side beam, a groove matching the protrusion is provided on the side beam, the protrusion is inserted into the groove, the mounting groove is provided on the side of the protrusion facing the side beam, and the power lead-out member is provided in the mounting groove; The fixing bracket is a heat insulating member.

2. The battery pack according to claim 1, characterized in that: A heat-conducting adhesive is provided on one side of the power lead-out member facing the side beam, and the power lead-out member is connected to the side beam via the heat-conducting adhesive.

3. The battery pack according to claim 1, characterized in that: The power lead-out member is in contact with or bonded to the bottom wall of the groove.

4. The battery pack according to claim 1, characterized in that: The multiple battery cells are arranged along a first direction to form a battery cell array, the first direction is the thickness direction of the battery cells, the fixed bracket is located on one side of the battery cell array along the first direction, and the fixed bracket is respectively abutted against the side beam and the battery cell array.

5. The battery pack according to claim 4, characterized in that: The fixing bracket includes a first glass fiber layer, a foaming layer, and a second glass fiber layer which are stacked in sequence. The first glass fiber layer abuts against the battery cell array, and the second glass fiber layer abuts against the side beam.

6. The battery pack according to claim 4, characterized in that: The battery cell assembly comprises a plurality of battery cell arrays, which are arranged along a second direction and electrically connected, wherein the second direction is a length direction of the battery cells; The battery pack includes a plurality of the fixing brackets, the plurality of the fixing brackets are located on one side of the battery cell assembly, and the fixing brackets are arranged in a one-to-one correspondence with the battery cell array.

7. The battery pack according to claim 1, characterized in that: The total electrode includes a total positive electrode and a total negative electrode, the power lead-out member is a copper bar connected to the total negative electrode, or the power lead-out member is an aluminum bar connected to the total positive electrode.

8. The battery pack according to claim 1, characterized in that: A first bending portion is provided at one end of the power lead-out piece, and a second bending portion is provided at the other end of the power lead-out piece. The first bending portion is connected to the main electrode, and the second bending portion is used to connect to the distribution box.

9. A vehicle, characterized in that: A battery pack comprising any one of claims 1-8.

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