Battery module and battery pack
By arranging heating units with different contact areas or resistivities in the battery module, the battery cores at different positions are heated to make them consistent in temperature, thus solving the problem of reduced battery life caused by excessive temperature differences in the battery cores in the existing technology. The temperature balance and battery life of the battery pack are improved.
Patent Information
- Application Number
- CN202421039359.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-05-14
AI Technical Summary
In the prior art, when heating the battery cell, the temperature difference between the battery cell is too large, resulting in a reduced battery life of the battery pack.
By arranging heating units with different contact areas or resistivities in the battery module, the first battery core and the second battery core at different positions are heated to make them consistent in temperature, thereby achieving temperature balance at different positions in the battery module. sex.
The consistency of cell temperature at different locations in the battery module is achieved, improving the endurance of the battery pack.
Smart Images
Figure CN222380667U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of new energy vehicles, specifically to a battery module and battery pack. Background Technology
[0002] With the rapid entry of new energy vehicles into households, people's pursuit of long driving range is constantly increasing. Due to low winter temperatures, the charging time and driving range of new energy vehicles cannot meet people's needs. Among them, the main reason affecting the battery pack's range is the excessively low temperature of the battery cells. Current technology attempts to maintain battery range by heating the cells; however, the existing methods of heating the cells result in excessive temperature differences between the cells, leading to a reduction in the battery pack's range. Utility Model Content
[0003] The purpose of this utility model is to provide a battery module and battery pack that can achieve temperature uniformity in different locations of the battery module by setting heating units with first and second partitions for the first and second battery cells located at different positions. This is achieved by using a method where the contact area between the first partition and a single first battery cell is smaller than the contact area between the second partition and a single second battery cell, or by making the resistivity of the first partition smaller than the resistivity of the second partition.
[0004] The embodiments of this utility model are implemented as follows:
[0005] In a first aspect, this utility model provides a battery module, comprising:
[0006] The battery cell unit includes multiple first battery cells arranged in an array and multiple second battery cells arranged in an array. The multiple second battery cells are located on the periphery, and the multiple first battery cells are located in the area enclosed by the multiple second battery cells.
[0007] The heating unit includes a first section and a second section, the first section being in contact with all the first battery cells and the second section being in contact with all the second battery cells;
[0008] Wherein, the contact area between each first cell and the first partition is smaller than the contact area between each second cell and the second partition; or, the resistivity of the first partition is smaller than the resistivity of the second partition.
[0009] In an optional embodiment, the heating unit includes a heating wire, which includes an inner ring segment and an outer ring segment, and the inner ring segment is connected to the outer ring segment;
[0010] The first cell is in contact with the inner ring section; the second cell is in contact with the outer ring section and also with part of the inner ring section.
[0011] In an optional embodiment, the inner ring segment and the outer ring segment are respectively bent into multiple strands of first sub-heating wire and multiple strands of second sub-heating wire, and each first battery cell is in contact with one strand of first sub-heating wire, and each second battery cell is in contact with one strand of second sub-heating wire and also in contact with one strand of first sub-heating wire.
[0012] In an optional embodiment, the heating unit includes a heating wire, which includes an inner ring segment and an outer ring segment, and the inner ring segment is connected to the outer ring segment;
[0013] The first cell is in contact with the inner ring section, and the second cell is in contact with the outer ring section; the resistivity of the inner ring section is less than that of the outer ring section.
[0014] In an optional embodiment, the heating unit includes multiple heating wires, with each first cell in contact with one heating wire and each second cell in contact with at least two heating wires.
[0015] In an optional embodiment, the heating unit includes two heating wires, which are in contact with the first battery cell and the second battery cell, respectively.
[0016] The resistivity of the heating wire in contact with the first battery cell is less than that of the heating wire in contact with the second battery cell.
[0017] In an optional embodiment, the heating unit includes a heating element, which is bent to form a continuous inner ring and an outer ring, the inner ring being in contact with a first battery cell and the outer ring being in contact with a second battery cell.
[0018] The contact area between each first cell and the inner ring is smaller than the contact area between each second cell and the outer ring.
[0019] In an optional embodiment, the heating unit further includes a heat-conducting plate with heat-conducting grooves, and the heating wire is housed in the heat-conducting plate.
[0020] In an optional embodiment, the heating unit further includes two liquid collecting plates and multiple liquid cooling plates, with the two liquid collecting plates connected to both ends of the liquid cooling plates respectively, and the battery cell unit located between the two liquid collecting plates.
[0021] Multiple liquid cooling plates are arranged parallel to and spaced apart along the arrangement direction of the first battery cell, and each first battery cell and each second battery cell are attached to the liquid cooling plates on both sides.
[0022] Secondly, this utility model provides a battery pack, comprising:
[0023] The housing and the aforementioned battery module, wherein the battery module is housed in the housing and connected to the housing.
[0024] The beneficial effects of this utility model embodiment include:
[0025] The battery module includes a cell unit and a heating unit. The cell unit includes multiple first cells arranged in an array and multiple second cells arranged in an array. The multiple second cells are located on the periphery, and the multiple first cells are located in the area enclosed by the multiple second cells. The heating unit includes a first partition and a second partition. The first partition is in contact with all the first cells, and the second partition is in contact with all the second cells. The contact area between each first cell and the first partition is smaller than the contact area between each second cell and the second partition; or, the resistivity of the first partition is smaller than the resistivity of the second partition.
[0026] This battery module can achieve temperature uniformity in different locations of the battery module by setting heating units with first and second partitions for the first and second cells located at different positions. By utilizing the fact that the contact area between the first partition and a single first cell is smaller than the contact area between the second partition and a single second cell, or by making the resistivity of the first partition smaller than the resistivity of the second partition, the temperature of the first and second cells located at different positions is made the same, thereby improving the battery pack's range. Attached Figure Description
[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 This is a schematic diagram of the structure of the battery module provided in an embodiment of the present utility model;
[0029] Figure 2 This is a schematic diagram of the structure of the battery cell unit provided in an embodiment of the present utility model;
[0030] Figure 3 This is a schematic diagram of the structure of the heating unit provided in an embodiment of the present utility model;
[0031] Figure 4 This is a schematic diagram of the structure of the battery cell unit and the heating unit provided in the embodiment of this utility model;
[0032] Figure 5 for Figure 4 A magnified view of a section at point C;
[0033] Figure 6 This is a schematic diagram of the structure of the heat-conducting plate provided in an embodiment of the present utility model;
[0034] Figure 7This is a schematic diagram of the structure of the liquid cooling unit provided in an embodiment of the present invention.
[0035] Icons: 100-Battery module; 110-Cell unit; 111-First cell; 112-Second cell; 120-Heating unit; 121-Heating wire; 122-Inner ring section; 123-Outer ring section; 124-First sub-heating wire; 125-Second sub-heating wire; 127-Heat conducting plate; 128-Heat conducting groove; 130-Liquid cooling unit; 131-Liquid collecting plate; 132-Liquid cooling plate. Detailed Implementation
[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0039] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0040] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0041] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0042] In existing technologies, heating the cells is used to address the issue that low cell temperatures in a battery pack can affect the battery pack's range. However, because the outer cells are in contact with other structures, some of their heat is transferred to these structures, causing the outer cells to be colder than the cells in the middle. This results in a large temperature difference between cells in different locations within the battery module, ultimately reducing the battery pack's range.
[0043] Based on this, this utility model embodiment provides a battery pack, which includes a housing and a battery module 100, wherein the battery module 100 is housed in the housing and connected to the housing. The battery cells in different locations within the battery module 100 have the same temperature, thereby achieving a constant temperature setting for the battery pack.
[0044] The following is a detailed description of the battery module 100:
[0045] Please refer to Figures 1-5 , Figure 1 This is a schematic diagram of the structure of the battery module 100 provided in an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of the battery cell unit 110 provided in an embodiment of the present utility model; Figure 3 This is a schematic diagram of the structure of the heating unit 120 provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the battery cell unit 110 and the heating unit 120 provided in an embodiment of the present utility model; Figure 5 for Figure 4 A magnified view of a section at point C.
[0046] The battery module 100 includes a cell unit 110 and a heating unit 120. The cell unit 110 includes a plurality of first cells 111 arranged in an array and a plurality of second cells 112 arranged in an array. The plurality of second cells 112 are located on the periphery, and the plurality of first cells 111 are located in the area enclosed by the plurality of second cells 112. The heating unit 120 includes a first partition and a second partition. The first partition is in contact with all the first cells 111, and the second partition is in contact with all the second cells 112. The contact area between each first cell 111 and the first partition is smaller than the contact area between each second cell 112 and the second partition; or, the resistivity of the first partition is smaller than the resistivity of the second partition.
[0047] Specifically, in this embodiment, when the resistivity of the first partition and the second partition are the same, the contact area between each first cell 111 and the first partition is smaller than the contact area between each second cell 112 and the second partition; thus, the heat provided by the first partition to a single first cell 111 is less than the heat provided by the second partition to a single second cell 112, thereby making the temperatures of the first cell 111 and the second cell 112 the same, achieving the same cell temperature at different locations in the battery module 100, thereby achieving constant temperature setting of the battery module 100 and improving the battery pack's range.
[0048] It should be noted that in other embodiments, when the contact area between each first cell 111 and the first partition is equal to the contact area between each second cell 112 and the second partition, the resistivity of the first partition is less than the resistivity of the second partition; or, the contact area between each first cell 111 and the first partition is less than the contact area between each second cell 112 and the second partition, and at the same time, the resistivity of the first partition is less than the resistivity of the second partition.
[0049] The working principle of the battery module 100 in this battery pack is as follows:
[0050] In the battery module 100, the area of the heat-conducting region formed by the contact between the first partition and the single first cell 111 is smaller than the area of the heat-conducting region formed by the contact between the second partition and the single second cell 112. This results in the first cell 111 absorbing less heat from the first partition than the second cell 112 absorbing heat from the second partition. The additional heat absorbed by the second cell 112 compared to the first cell 111 is equal to the heat transferred by the second cell 112 to other structures, i.e., the additional heat released by the second cell 112 compared to the first cell 111. This makes the temperature of the second cell 112 the same as the temperature of the first cell 111, thereby achieving temperature uniformity in different locations within the battery module 100 and improving the battery pack's range.
[0051] Further, please refer to Figures 3-5The heating unit 120 includes a heating wire 121, which includes an inner ring section 122 and an outer ring section 123. The inner ring section 122 is connected to the outer ring section 123. The first battery cell 111 is in contact with the inner ring section 122. The second battery cell 112 is in contact with the outer ring section 123 and also in contact with a portion of the inner ring section 122.
[0052] Specifically, in this embodiment, the resistivity of the inner ring segment 122 and the outer ring segment 123 is the same. In order to increase the contact area between the first battery cell 111 and the second battery cell 112 and the heating wire 121, the second battery cell 112 contacts part of the inner ring segment 122. This results in the contact area between the first battery cell 111 and the heating wire 121 being smaller than the contact area between the second battery cell 112 and the heating wire 121. Consequently, the temperatures of the first battery cell 111 and the second battery cell 112 are the same, thereby achieving temperature uniformity at different locations in the battery module 100 and improving the battery pack's range.
[0053] In this embodiment, based on the above, the inner ring segment 122 and the outer ring segment 123 are respectively bent into multiple strands of first sub-heating wire 124 and multiple strands of second sub-heating wire 125. Each first cell 111 is in contact with one strand of first sub-heating wire 124, and each second cell 112 is in contact with one strand of second sub-heating wire 125 and one strand of first sub-heating wire 124. Specifically, in this embodiment, the cell is a cylindrical cell. To increase the density of the cell unit 110 and to make more reasonable use of space, each row of cells in this embodiment is staggered. Therefore, the heating wire 121 needs to be bent according to the arrangement of the cells, resulting in the inner ring segment 122 and the outer ring segment 123 being bent into multiple strands of first sub-heating wire 124 and multiple strands of second sub-heating wire 125, respectively.
[0054] Each first cell 111 is in contact with a first sub-heating wire 124, and each second cell 112 is in contact with a second sub-heating wire 125 and a first sub-heating wire 124. This makes the contact area between the second cell 112 and the heating wire 121 larger than the contact area between the first cell 111 and the heating wire 121, thereby making the temperatures of the first cell 111 and the second cell 112 the same, so as to achieve temperature uniformity at different locations in the battery module 100, and thus improve the battery pack's range.
[0055] In other embodiments, the first battery cell 111 is in contact with the inner ring segment 122, and the second battery cell 112 is in contact with the outer ring segment 123; the resistivity of the inner ring segment 122 is less than that of the outer ring segment 123. In this case, the first battery cell 111 may not be in contact with the outer ring segment 123, utilizing the difference in resistivity between the inner ring segment 122 and the outer ring segment 123 to ensure that the first battery cell 111 and the second battery cell 112 have the same temperature. It should be noted that one of the factors causing the change in resistivity is the difference in materials, that is, the inner ring segment 122 and the outer ring segment 123 in the heating wire 121 are composed of different materials.
[0056] Furthermore, in other embodiments, multiple heating wires 121 may be provided, with each first battery cell 111 in contact with one heating wire 121 and each second battery cell 112 in contact with at least two heating wires 121. In this case, the resistivity of each heating wire 121 is the same. By ensuring that the number of heating wires 121 in contact with the second battery cell 112 is greater than the number of heating wires 121 in contact with the first battery cell 111, the temperatures of the second battery cell 112 and the first battery cell 111 become the same, thereby achieving temperature uniformity at different locations in the battery module 100 and improving the battery pack's range.
[0057] In other embodiments, two heating wires 121 may be provided, with the two heating wires 121 contacting the first battery cell 111 and the second battery cell 112 respectively; wherein the resistivity of the heating wire 121 in contact with the first battery cell 111 is less than the resistivity of the heating wire 121 in contact with the second battery cell 112. It should be noted that the number of heating wires 121 is not limited to two, and the number can be set to a plurality of more than two, with the number of heating wires 121 in contact with the first battery cell 111 and the number of heating wires 121 in contact with the second battery cell 112 being the same. This allows the temperature of the second battery cell 112 and the first battery cell 111 to be the same by changing the resistivity of the heating wires 121, thereby achieving temperature uniformity at different locations in the battery module 100 and improving the battery pack's range.
[0058] In other embodiments, the heating unit 120 includes a heating element for heating the battery cell. The heating element is bent to form a continuous inner ring and an outer ring. The inner ring contacts the first battery cell 111, and the outer ring contacts the second battery cell 112. The contact area between each first battery cell 111 and the inner ring is smaller than the contact area between each second battery cell 112 and the outer ring. Similarly, the resistivity of the inner ring is equal to the resistivity of the outer ring.
[0059] Further, please refer to Figure 6 , Figure 6This is a schematic diagram of the structure of the heat-conducting plate 127 provided in this embodiment of the present invention. In this embodiment, to avoid direct contact between the heating wire 121 and the battery cell, thereby damaging the battery cell, the heating unit 120 further includes a heat-conducting plate 127. The heat-conducting plate 127 has heat-conducting grooves 128, and the heating wire 121 is housed in the heat-conducting plate 127. The heating wire 121 transfers heat to the heat-conducting plate 127, and the heat-conducting plate 127 is used to heat the battery cell to prevent the heating wire 121 from overheating and damaging the battery cell.
[0060] Further, please refer to Figure 7 , Figure 7 This is a schematic diagram of the liquid cooling unit 130 provided in this embodiment of the present invention; the heating unit 120 also includes two liquid collecting plates 131 and multiple liquid cooling plates 132. The two liquid collecting plates 131 are respectively connected to both ends of the liquid cooling plates 132, and the battery cell unit 110 is located between the two liquid collecting plates 131; thereby ensuring that the liquid cooling effect of the liquid cooling plates 132 on each battery cell is the same, ensuring that the temperature of the battery cells in different positions in the battery module 100 is the same, so as to achieve temperature uniformity in different positions in the battery module 100, thereby improving the battery pack's range. Furthermore, liquid cooling is performed simultaneously with heating, so that the overall temperature of the battery pack is maintained within a certain range.
[0061] Please refer to Figure 7 In this embodiment, by placing the liquid collecting plates 131 on both sides of the battery cell unit 110 and using the liquid collecting plates 131 instead of the end plates, both costs are saved and the battery cell unit 110 is protected. Furthermore, since the battery cell is a cylindrical battery cell, in order to improve the cooling effect on the battery cell, the liquid cooling plate 132 is a serpentine plate, thereby increasing the contact area between the liquid cooling plate 132 and the battery cell.
[0062] In summary, the battery module 100 includes a cell unit 110 and a heating unit 120. The cell unit 110 includes a plurality of first cells 111 arranged in an array and a plurality of second cells 112 arranged in an array. The plurality of second cells 112 are all located on the periphery, and the plurality of first cells 111 are all located in the area enclosed by the plurality of second cells 112. The heating unit 120 includes a first partition and a second partition. The first partition is in contact with all the first cells 111, and the second partition is in contact with all the second cells 112. The contact area between each first cell 111 and the first partition is smaller than the contact area between each second cell 112 and the second partition; or, the resistivity of the first partition is smaller than the resistivity of the second partition.
[0063] The battery module 100 can achieve temperature uniformity at different locations by setting heating units 120 with first and second partitions for the first cell 111 and the second cell 112 located at different positions. By utilizing the fact that the contact area between the first partition and a single first cell 111 is smaller than the contact area between the second partition and a single second cell 112, or by making the resistivity of the first partition smaller than the resistivity of the second partition, the temperature of the first cell 111 and the second cell 112 located at different positions is made the same, thereby achieving temperature uniformity at different locations in the battery module 100 and improving the battery pack's range.
[0064] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A battery module, characterized in that: include: A battery cell unit, wherein the battery cell unit comprises a plurality of first battery cells arranged in an array and a plurality of second battery cells arranged in an array, wherein the plurality of second battery cells are all located at the periphery, and the plurality of first battery cells are all located in an area surrounded by the plurality of second battery cells; A heating unit, the heating unit comprising a first partition and a second partition, the first partition contacts all of the first battery cells, and the second partition contacts all of the second battery cells; Wherein, the contact area between each of the first battery cells and the first partition is smaller than the contact area between each of the second battery cells and the second partition; or, the resistivity of the first partition is smaller than the resistivity of the second partition.
2. The battery module according to claim 1, characterized in that: The heating unit comprises a heating wire, the heating wire comprises an inner ring segment and an outer ring segment, the inner ring segment is connected to the outer ring segment; The first battery cell is in contact with the inner ring segment; the second battery cell is in contact with the outer ring segment and part of the inner ring segment.
3. The battery module according to claim 2, characterized in that: The inner ring segment and the outer ring segment are respectively bent into multiple strands of first sub-heating wires and multiple strands of second sub-heating wires, and each of the first battery cells is in contact with one strand of the first sub-heating wire, each of the second battery cells is in contact with one strand of the second sub-heating wire, and is in contact with one strand of the first sub-heating wire.
4. The battery module according to claim 1, characterized in that: The heating unit comprises a heating wire, the heating wire comprises an inner ring segment and an outer ring segment, the inner ring segment is connected to the outer ring segment; The first battery cell is in contact with the inner ring segment, and the second battery cell is in contact with the outer ring segment; the resistivity of the inner ring segment is smaller than the resistivity of the outer ring segment.
5. The battery module according to claim 1, characterized in that: The heating unit includes a plurality of heating wires, each of the first battery cells is in contact with one of the heating wires, and each of the second battery cells is in contact with at least two of the heating wires.
6. The battery module according to claim 1, characterized in that: The heating unit comprises two heating wires, and the two heating wires are in contact with the first battery core and the second battery core respectively; Wherein, the resistivity of the heating wire in contact with the first battery core is smaller than the resistivity of the heating wire in contact with the second battery core.
7. The battery module according to claim 1, characterized in that: The heating unit comprises a heating plate, the heating plate is bent to form a continuous inner ring and an outer ring, the inner ring is in contact with the first battery core, and the outer ring is in contact with the second battery core; Wherein, the contact area between each of the first battery cells and the inner ring is smaller than the contact area between each of the second battery cells and the outer ring.
8. The battery module according to any one of claims 2 to 6, characterized in that: The heating unit further comprises a heat conducting plate, the heat conducting plate is provided with a heat conducting groove, and the heating wire is accommodated in the heat conducting plate.
9. The battery module according to claim 1, characterized in that: The heating unit further comprises two liquid collecting plates and a plurality of liquid cooling plates, the two liquid collecting plates are respectively connected to two ends of the liquid cooling plate, and the battery cell unit is located between the two liquid collecting plates; The plurality of liquid cooling plates are arranged in parallel and at intervals along the arrangement direction of the first battery cells, and each of the first battery cells and each of the second battery cells are attached to the liquid cooling plates on both sides.
10. A battery pack, characterized in that: include: A shell and a battery module as described in any one of claims 1 to 9, wherein the battery module is accommodated in and connected to the shell.