Battery pack and vehicle
By incorporating a double-layer heating wire structure within the battery pack, the problem of inconsistent cell temperatures in low-temperature environments is solved, achieving uniform heating of the cells and improving the battery pack's durability.
Patent Information
- Application Number
- CN202423172146.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-12-20
AI Technical Summary
In low-temperature environments, the cell temperatures of new energy vehicle battery packs are inconsistent, leading to a decrease in durability.
A double-layer heating wire structure is adopted, in which the first heating wire provides basic heating to the battery cell, and the second heating wire provides supplementary heating to the edge battery cells, thereby improving temperature uniformity.
The double-layer heating wire structure improves the temperature uniformity of the cells within the battery pack, thereby enhancing the battery pack's durability.
Smart Images
Figure CN223757603U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of vehicles, in particular to a battery pack and a vehicle. BACKGROUND
[0002] With the development of the new energy automobile industry, more and more users choose new energy automobiles, but the storage capacity and performance of the battery pack in the new energy automobile are greatly affected by temperature. When the battery pack is in a low-temperature environment, the storage capacity of the battery pack will decrease. Therefore, a heating device is arranged in the battery pack. However, in the actual use process of the heating device, the temperatures of the battery cells at different positions in the battery pack are inconsistent, which affects the durability of the battery pack. CONTENT OF THE UTILITY MODEL
[0003] Therefore, the present application provides a battery pack and a vehicle to solve the problem of poor durability of the battery pack in the prior art.
[0004] In a first aspect, an embodiment of the present application provides a battery pack, which comprises: a shell, the shell having a containing cavity; a plurality of battery cells, the plurality of battery cells being located in the containing cavity; an inner lining plate, the inner lining plate being located in the containing cavity and fixedly connected with the shell, and the inner lining plate being located below the plurality of battery cells; wherein the inner lining plate is further provided with heating wires, the heating wires comprising first heating wires and second heating wires, the second heating wires being arranged outside the first heating wires, the plurality of battery cells comprising second battery cells and first battery cells arranged outside the second battery cells, a projection of at least one first battery cell along the height direction of the battery pack overlapping with the first heating wires and the second heating wires, and the first heating wires and the second heating wires being used for heating the first battery cells.
[0005] In this embodiment, when the heating wires are used to heat the battery cells in the battery pack, the second heating wires can supplement the heating of the first battery cells at the edge position in the battery pack on the basis of the first heating wires, improve the heating effect of the first battery cells, reduce the temperature difference between the first battery cells and the second battery cells, thereby improving the temperature consistency of the battery cells in the battery pack, and further improving the overall durability of the battery pack.
[0006] In a specific embodiment, a projection of the second battery cells along the height direction of the battery pack overlaps with the first heating wires, so that the first heating wires are used to heat the second battery cells.
[0007] In a specific embodiment, the second heating wires comprise oppositely arranged first and second portions, the first and second portions being arranged outside the first heating wires, and the first and second portions being connected in series with the first heating wires.
[0008] In a specific embodiment, the inner lining plate is provided with a first limiting groove, and the heating wire is located in the first limiting groove.
[0009] In a specific embodiment, the inner lining plate is further provided with a second limiting groove in communication with the first limiting groove, and the first limiting groove is in communication with the outside through the second limiting groove; the second heating wire is further provided with an interface, and the interface is connected with an external power supply through the second limiting groove.
[0010] In a specific embodiment, the inner lining plate is provided with a fixing groove, and the fixing groove is located in the middle of the inner lining plate; the inner lining plate is fixedly connected with the shell through the bottom wall of the fixing groove.
[0011] In a specific embodiment, the fixing groove comprises at least a first extension and a second extension; the first extension extends along the length direction of the battery pack, and the second extension extends along the width direction of the battery pack.
[0012] In a specific embodiment, the rated power of the first heating wire is higher than the rated power of the second heating wire.
[0013] In a specific embodiment, the first heating wire is in a serpentine distribution, and at least part of the second heating wire is in a wave structure.
[0014] In a second aspect, the embodiments of the present application provide a vehicle, which comprises the battery pack.
[0015] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0017] Figure 1 The structure schematic diagram of the battery pack provided by the present application in a specific embodiment;
[0018] Figure 2 The structure schematic diagram of the heating wire in a specific embodiment; Figure 1
[0019] The structure schematic diagram of the heating wire in a specific embodiment; Figure 3 Figure 1 The structure schematic diagram of the inner lining plate in a specific embodiment.
[0020] Explanation of reference signs:
[0021] 1-battery pack;
[0022] 11-housing;
[0023] 12-inner lining plate;
[0024] 121-heating wire;
[0025] 122-first heating wire;
[0026] 123-second heating wire;
[0027] 123a-first part;
[0028] 123b-second part;
[0029] 124-first limiting slot;
[0030] 125-second limiting slot;
[0031] 126-fixing slot;
[0032] 126a-first extension;
[0033] 126b-second extension;
[0034] 127-interface;
[0035] 13-positioning support;
[0036] 131-positioning hole. DETAILED DESCRIPTION
[0037] In order to better understand the technical solutions of the present application, the embodiments of the present application are described in detail below in combination with the drawings.
[0038] It should be clear that the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.
[0039] The terms used in the embodiments of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.
[0040] It should be understood that the term "and / or" used herein is only to describe an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.
[0041] As Figure 1 indicated, the embodiments of the present application provide a battery pack 1 and a vehicle comprising the battery pack 1. The vehicle can adopt various forms, for example, an electric vehicle, and can also be a vehicle adopting hybrid power. In some embodiments, the vehicle can be a car, a truck, a trailer, an entertainment vehicle, a construction vehicle or an engineering vehicle, etc. In some embodiments, the vehicle can be a domestic vehicle, a passenger vehicle of operational nature or a freight vehicle of operational nature, etc. In general, those skilled in the art can conceive to implement the embodiments of the present disclosure on other types of vehicles.
[0042] Among them, the battery pack as an important part of the vehicle is the energy source of the vehicle. However, when used in a low temperature environment, the storage capacity of the battery pack will decrease due to the influence of temperature. Therefore, heating wires are usually arranged in the battery pack to heat all the battery cells in the battery pack. However, since the battery cells in the battery pack also generate heat when working, and the heat dissipation effect of the middle region of the battery pack is poorer than that of the edge region, after heating all the battery cells using the heating wires, the temperature of the battery cells in the middle region of the battery pack is higher, while the temperature of the battery cells in the edge region of the battery pack is lower, which leads to poor temperature consistency of the battery cells in the battery pack, affecting the durability of the battery pack.
[0043] To solve the above technical problems, as Figure 1 indicated, the embodiments of the present application provide a battery pack 1, comprising: a shell 11, a plurality of battery cells and an inner lining plate 12, the shell 11 has a receiving cavity, the plurality of battery cells and the inner lining plate 12 are located in the receiving cavity, and the inner lining plate 12 is fixedly connected with the shell 11 and located below the plurality of battery cells. Wherein, the inner lining plate 12 is further provided with a heating wire 121, and please refer to Figure 3 the heating wire 121 comprises a first heating wire 122 and a second heating wire 123, the second heating wire 123 is arranged outside the first heating wire 122, the plurality of battery cells comprises a second battery cell and a first battery cell arranged outside the second battery cell, that is, the plurality of first battery cells surround the second battery cell. The projection of at least one first battery cell in the height direction of the battery pack 1 overlaps with the first heating wire 122 and the second heating wire 123, and the first heating wire 122 and the second heating wire 123 are used for heating the first battery cell.
[0044] In the embodiment, when the heating wire 121 is used to heat the battery cells in the battery pack 1, the second heating wire 123 can supplementally heat the first battery cell at the edge position in the battery pack 1 on the basis of the first heating wire 122, improve the heating effect on the first battery cell, reduce the temperature difference between the first battery cell and other battery cells in the middle region of the battery pack 1, improve the temperature consistency of the battery cells in the battery pack 1, and further improve the durability of the battery pack 1.
[0045] In a specific embodiment, as shown in Figures 1 to 3 the projection of the first battery cell along the height direction of the battery pack 1 can overlap the first heating wire 122, and the first heating wire 122 is used to heat the first battery cell; the plurality of battery cells further include at least one second battery cell, the at least one second battery cell is located on the inner side of the first battery cell, and the projection of the second battery cell along the height direction of the battery pack 1 can overlap the first heating wire 122, so that the first heating wire 122 is used to heat the second battery cell.
[0046] In the embodiment, the projection of the first battery cell along the height direction of the battery pack 1 overlaps the first heating wire 122, so that the first heating wire 122 can be used to heat the first battery cell, thereby enabling the first battery cell at the edge position to be simultaneously heated by the first heating wire 122 and the second heating wire 123, improving the heating effect on the first battery cell, significantly improving the temperature of the first battery cell, enabling the temperature of the first battery cell to be consistent with the temperature of the second battery cell at the middle position of the battery pack 1, improving the overall consistency of the temperature of the battery cells in the battery pack 1, and thereby improving the durability of the battery pack 1.
[0047] In the above embodiment, as shown in Figure 1 the battery pack 1 can further have a positioning support 13, the positioning support 13 is fixedly connected with the inner lining plate 12, and the heating wire 121 is located between the positioning support 13 and the inner lining plate 12 along the height direction of the battery pack 1. The positioning support 13 is used to fix the battery cells, and a plurality of mounting holes 131 are arranged on the positioning support 13, the battery cells are positioned and mounted through the plurality of mounting holes 131, and the bottom of the battery cells can directly contact the heating wire 121 through the mounting holes 131, thereby improving the heating effect of the heating wire 121 on the battery cells.
[0048] In a specific embodiment, as shown in Figure 2 the second heating wire 123 can include oppositely arranged first and second portions 123a and 123b, the first and second portions 123a and 123b are arranged on the outer side of the first heating wire 122, and the first and second portions 123a and 123b are connected in series with the first heating wire 122.
[0049] In the embodiment, the second heating wire 123 includes the first part 123a and the second part 123b which are oppositely arranged, so that the first part 123a and the second part 123b are respectively connected in series with the two ends of the first heating wire 122, and the first part 123a, the second part 123b and the first heating wire 122 are connected in series, thereby simplifying the overall power supply circuit of the heating wire 121.
[0050] In a specific embodiment, as shown in Figure 2 and Figure 3 , the inner lining plate 12 can be provided with a first limiting groove 124, and the heating wire 121 is located in the first limiting groove 124.
[0051] In the embodiment, the first limiting groove 124 is arranged on the inner lining plate 12 to provide positioning and placement space for the installation of the heating wire 121, and the heating wire 121 is fixedly connected with the inner lining plate 12 through the first limiting groove 124, which can improve the connection reliability of the heating wire 121 and the inner lining plate 12, and avoid the phenomenon of falling off of the heating wire 121 during long-term use. In the embodiment, the shape of the first limiting groove 124 can be arranged to correspond to the shape of the heating wire 121, so as to facilitate the installation of the heating wire 121.
[0052] In the above embodiment, as shown in Figure 2 and Figure 3 , the inner lining plate 12 can also be provided with a second limiting groove 125 which is in communication with the first limiting groove 124, and the first limiting groove 124 is in communication with the outside through the second limiting groove 125; the first part 123a and the second part 123b of the second heating wire 123 are respectively provided with an interface 127, and the interface 127 is connected with the external power supply through the second limiting groove 125. That is, the interface 127 of the first part 123a and the interface 127 of the second part 123b can supply power to the first part 123a, the second part 123b and the first heating wire 122.
[0053] In the embodiment, the inner lining plate 12 is also provided with the second limiting groove 125 which is in communication with the outside, so that the interface 127 of the first part 123a and the second part 123b can be in communication with the external power supply through the second limiting groove 125, and the interface 127 is provided with a placement space, and the connection reliability and stability of the interface 127 and the inner lining plate 12 can be improved to avoid falling off.
[0054] In another specific embodiment, the first heating wire 122 and the second heating wire 123 can be independently arranged (not shown in the figure), the second heating wire 123 surrounds the first heating wire 122, and the first heating wire 122 and the second heating wire 123 are respectively provided with independent interfaces 127 and independent power supply circuits, thereby improving the control effect of the first heating wire 122 and the second heating wire 123. In another specific embodiment, the first heating wire 122 and the second heating wire 123 can be independently arranged (not shown in the figure), the second heating wire 123 surrounds the first heating wire 122, and the first heating wire 122 and the second heating wire 123 are respectively provided with independent interfaces 127 and independent power supply circuits, thereby improving the control effect of the first heating wire 122 and the second heating wire 123.
[0055] In the above embodiments, as shown in Figure 1 and Figure 2 the first heating wire 122 can be in a serpentine distribution, and at least part of the second heating wire 123 can be in a wave shape.
[0056] In the present embodiment, the first heating wire 122 is in a serpentine distribution, so that the projection of the first heating wire 122 along the height direction of the battery pack 1 overlaps each battery cell, so that the first heating wire 122 can heat each battery cell in the battery pack 1, and the first heating wire 122 is in a serpentine distribution, which can lengthen the length of the first heating wire 122 under the condition that the area occupied by the first heating wire 122 is constant, thereby improving the heating effect of the first heating wire 122. At the same time, as shown in Figure 1 to avoid the mounting components of the positioning support 13, the mounting holes 131 in the upper part of the positioning support 13 are in a wave shape, that is, the plurality of first battery cells corresponding thereto are in a wave shape, so that the second heating wire 123 in the present embodiment is in a wave shape, so that the projection of the second heating wire 123 along the height direction of the battery pack 1 can overlap the part of the first battery cells in a wave shape, so that the second heating wire 123 can heat all the first battery cells, and the second heating wire is in a wave shape, which can lengthen the length of the second heating wire 123 under the condition that the area occupied by the second heating wire 123 is constant, thereby improving the heating effect of the second heating wire 123.
[0057] In a specific embodiment, as shown in Figure 1 and Figure 3 the inner lining plate 12 can further be provided with a fixing groove 126, and the fixing groove 126 is located in the middle part of the inner lining plate 12; the inner lining plate 12 is fixedly connected with the shell 11 through the bottom wall of the fixing groove 126.
[0058] In the present embodiment, the inner lining plate 12 is fixedly connected with the shell 11 through the bottom wall of the fixing groove 126, which can improve the connection reliability of the inner lining plate 12 and the shell 11, and the fixing groove 126 is located in the middle part of the inner lining plate 12, which can improve the connection stability of the inner lining plate 12 and the shell 11, thereby avoiding the phenomenon of falling off of the inner lining plate 12. At the same time, the fixing groove 126 is located in the middle part of the inner lining plate 12, and the bottom wall of the fixing groove 126 is in contact with the shell 11, which can also make the heat generated by the battery cell in the middle position conduct to the shell 11 through the fixing groove 126, which is conducive to improving the heat dissipation effect of the battery cell in the middle position, thereby reducing the temperature difference of the battery cells in different positions in the battery pack 1, improving the temperature consistency of the battery cells, and thereby improving the durability of the battery pack 1. The connection mode of the inner lining plate 12 and the shell 11 includes but is not limited to welding, gluing, etc.
[0059] In a specific embodiment, as shown in Figure 1 andFigure 3 As shown, the fixing groove 126 can at least include a first extension 126a and a second extension 126b; the first extension 126a extends along the length direction of the battery pack 1, and the second extension 126b extends along the width direction of the battery pack 1.
[0060] In the embodiment, the fixing groove 126 includes the first extension 126a and the second extension 126b, which can increase the welding area of the fixing groove 126 and the shell 11, thereby improving the connection reliability and stability of the inner lining plate 12 and the shell 11. The first extension 126a extends along the length direction of the battery pack 1, and the second extension 126b extends along the width direction of the battery pack 1, so that the first extension 126a and the second extension 126b are perpendicular to each other and intersect each other, thereby improving the torsional stiffness of the inner lining plate 12 and further improving the connection reliability and stability of the inner lining plate 12 and the shell 11.
[0061] In a specific embodiment, the rated power of the first heating wire 122 can be higher than the rated power of the second heating wire 123.
[0062] In the embodiment, the first battery cell is heated by the first heating wire 122 and the second heating wire 123, and the second heating wire 123 mainly plays a supplementary heating role on the first battery cell, i.e., supplementing the heat loss of the first battery cell due to heat dissipation. The heat loss of the first battery cell due to heat dissipation is less than the heat required to raise the overall temperature of the battery cell, so the rated power of the second heating wire 123 can be set to be less than the rated power of the first heating wire 122. At the same time, the rated power of the second heating wire 123 is set to be lower, so that in different use environments with different heat dissipation effects, the temperature of the first battery cell after being heated by the first heating wire 122 and the second heating wire 123 is close to the temperature of the second battery cell after being heated by the first heating wire 122, thereby reducing the temperature difference between the first battery cell and the second battery cell and improving the temperature consistency of the battery cells.
[0063] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A battery pack, characterized by, The battery pack comprises: a shell having a receiving cavity; a plurality of battery cells located in the receiving cavity; an inner lining plate located in the receiving cavity and fixedly connected with the shell, the inner lining plate being located below the plurality of battery cells; wherein the inner lining plate is further provided with heating wires, the heating wires comprising a first heating wire and a second heating wire, the second heating wire being located outside the first heating wire, the plurality of battery cells comprising a second battery cell and a first battery cell located outside the second battery cell, a projection of at least one first battery cell along the height direction of the battery pack overlapping with the first heating wire and the second heating wire, the first heating wire and the second heating wire being used for heating the first battery cell.
2. The battery pack of claim 1, wherein, The projection of the second battery cell along the height direction of the battery pack overlaps with the first heating wire, so that the first heating wire is used for heating the second battery cell.
3. The battery pack of claim 2, wherein, The second heating wire comprises oppositely arranged first and second portions, the first and second portions being located outside the first heating wire, and the first and second portions being connected in series with the first heating wire.
4. The battery pack of claim 1, wherein, The inner lining plate is provided with a first limiting groove, and the heating wires are located in the first limiting groove.
5. The battery pack of claim 4, wherein, The inner lining plate is further provided with a second limiting groove in communication with the first limiting groove, and the first limiting groove is in communication with the outside through the second limiting groove. The second heating wire is further provided with an interface, and the interface is connected with an external power supply through the second limiting groove.
6. The battery pack of any one of claims 1-5, wherein, The inner lining plate is provided with a fixing groove, and the fixing groove is located in the middle of the inner lining plate; the inner lining plate is fixedly connected with the shell through the bottom wall of the fixing groove.
7. The battery pack of claim 6, wherein, The fixing groove comprises at least a first extension and a second extension; The first extension extends along the length direction of the battery pack, and the second extension extends along the width direction of the battery pack.
8. The battery pack of any one of claims 1-5, wherein, The rated power of the first heating wire is higher than that of the second heating wire.
9. The battery pack of any one of claims 1-5, wherein, The first heating wire is in a serpentine distribution, and at least part of the second heating wire is in a wave shape structure.
10. A vehicle characterized by comprising: The vehicle comprises the battery pack of any one of claims 1-9.