Cylindrical battery cell module and battery pack

Abstract

The utility model discloses a cylindrical battery cell module and battery pack, the cylindrical battery cell module includes lower support, bus piece, side liquid cooling plate and top liquid cooling plate, the lower support is provided with at least one battery cell group, each battery cell group includes two battery cell columns, each battery cell column includes at least one cylindrical battery cell, each battery cell group is correspondingly provided with one side liquid cooling plate, the top liquid cooling plate is provided with a top liquid cooling plate, the top liquid cooling plate is provided with a top liquid cooling plate, and the bottom liquid cooling plate is provided with a top liquid cooling plate. The side liquid cooling plate is clamped between the two battery cell columns, the tops of all the cylindrical battery cells are connected in series and in parallel through the convergence piece, the convergence piece is coated with the heat-conducting structural adhesive, the heat-conducting structural adhesive completely covers the tops of all the battery cell groups, and the top liquid cooling plate is adhered to the upper part of the heat-conducting structural adhesive. The utility model has the beneficial effect of being suitable for small aircrafts such as unmanned aerial vehicles.

Description

Technical Field

[0001] This utility model relates to the field of cylindrical battery technology, specifically to a cylindrical cell module and battery pack. Background Technology

[0002] Lithium-ion batteries have advantages such as high energy density, good cycle performance, and fast charging and discharging, and are widely used in various fields such as new energy vehicles and energy storage. In practice, lithium-ion batteries are usually assembled into battery packs. Especially when used as power batteries in new energy vehicles, power battery packs not only need to meet the requirements of high energy density, high power density, and long life, but also need to have high structural strength to withstand the bumps and collisions during the use of new energy vehicles. Moreover, power battery packs generate a lot of heat in the charging and discharging environment, which affects battery life. Therefore, current power battery packs usually adopt a double-sided liquid cooling method, that is, liquid cooling plates are glued to both sides of each row of cells, and a large amount of structural adhesive is injected between the cell module and the battery pack shell, with the adhesive thickness generally >10mm. The large amount of structural adhesive is used to fix the cell module to the battery pack shell. Although this battery pack assembly method can increase the structural strength of the battery pack, the use of a large amount of structural adhesive also increases the weight of the battery pack. While increasing battery pack weight won't significantly impact new energy vehicles, it will increase the weight of small aircraft like drones. This requires more energy for takeoff and flight, and high discharge rates and frequent deep discharges can negatively affect battery pack lifespan. Clearly, the structure of new energy vehicle power battery modules and packs is unsuitable for small aircraft like drones. Furthermore, during ascent or acceleration, drones experience increased power and discharge, generating significant heat at the flow surface between the positive and negative electrodes that cannot dissipate quickly enough. This leads to elevated temperatures near the flow surface, further impacting battery lifespan.

[0003] Therefore, there is an urgent need for a cylindrical cell module and battery pack that can be used in small aircraft such as drones. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a cylindrical cell module and battery pack that can be applied to small aircraft such as drones.

[0005] The purpose of this utility model is achieved through the following technical measures: a cylindrical battery cell module, including a lower support, a busbar, a side liquid cooling plate, and a top liquid cooling plate. The lower support is provided with at least one battery cell group, each battery cell group includes two battery cell columns, each battery cell column includes at least one cylindrical battery cell, and each battery cell group is provided with a corresponding side liquid cooling plate. The side liquid cooling plate is sandwiched between the two battery cell columns. The tops of all cylindrical battery cells are connected in series and parallel through the busbar. The top of the busbar is coated with thermally conductive structural adhesive, which completely covers the top of all battery cell groups. The top liquid cooling plate is attached above the thermally conductive structural adhesive.

[0006] In some embodiments, the lower support is provided with a cell slot for accommodating cylindrical cells.

[0007] In some embodiments, the depth of the cell groove is 10-15 mm.

[0008] In some embodiments, two adjacent rows of cells are staggered.

[0009] In some embodiments, the lower support is made of PC material.

[0010] A battery pack, characterized in that it includes a housing and at least one cylindrical cell module, the housing being used to accommodate the cylindrical cell module, and the bottom of the lower bracket being connected to the bottom of the housing.

[0011] Compared with existing technologies, the advantages of this invention are as follows: This invention ensures the structural strength of the battery module by coating a layer of thermally conductive structural adhesive on the top of the cell module and fixing the cylindrical battery of the cell module with a lower bracket. Furthermore, a lower bracket with low density and light weight can be selected as needed. This invention also employs single-sided liquid cooling, reducing the number of side liquid cooling plates and thus reducing the amount of structural adhesive used inside the battery module. Moreover, this invention eliminates the need for seamless filling of a large amount of structural adhesive at the bottom of the battery pack casing, further reducing the amount of structural adhesive used and resulting in a lighter battery pack compared to existing power battery packs. In addition, this invention uses single-sided liquid cooling and includes a top liquid cooling plate, which reduces the number of side liquid cooling plates and effectively dissipates heat from the top flow surface of the cell module. Combined with the side liquid cooling plates, this ensures effective heat dissipation and prevents damage to the cell module due to excessive instantaneous current and insufficient heat dissipation.

[0012] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0013] Figure 1 This is an exploded structural diagram of the present invention.

[0014] The components include: 1. lower support, 2. cylindrical battery cell, 3. side liquid cooling plate, 4. thermally conductive structural adhesive, and 5. top liquid cooling plate. Detailed Implementation

[0015] like Figure 1 As shown, a cylindrical battery cell module includes a lower support 1, a busbar, a side liquid cooling plate 3, and a top liquid cooling plate 5. The lower support 1 has at least one battery cell group, each battery cell group includes two battery cell columns, each battery cell column includes at least one cylindrical battery cell 2, and each battery cell group is correspondingly provided with one side liquid cooling plate 3. The side liquid cooling plate 3 is sandwiched between the two battery cell columns. The tops of all cylindrical battery cells 2 are connected in series and parallel through the busbar. The top of the busbar is coated with thermally conductive structural adhesive 4, which completely covers the top of all battery cell groups. Specifically, the thermally conductive structural adhesive 4 completely wraps the busbar welded to the top of the cylindrical battery cell 2 and the terminal portion of the top of the cylindrical battery cell 2. The top liquid cooling plate 5 is adhered to the top of the thermally conductive structural adhesive 4, and the thermally conductive structural adhesive 4 achieves insulation between the busbar, the cylindrical battery cell 2, and the top liquid cooling plate 5. This invention employs a single-sided liquid cooling method, where a side liquid cooling plate 3 is installed on one side of each cell row. Compared to the existing double-sided liquid cooling method, this reduces the number of side liquid cooling plates 3 used and also reduces the amount of structural adhesive used within the cell module. Furthermore, this invention features a top liquid cooling plate 5 on the top of the cell module, enabling effective heat dissipation from the top flow surface. Combined with the side liquid cooling plates 3, this ensures effective heat dissipation and prevents damage to the cells caused by excessive instantaneous current. The top of the cell module is completely covered with thermally conductive structural adhesive 4, achieving heat conduction and dissipation. The adhesive 4 also increases the connection strength between the busbar and the cylindrical cells 2, and binds all the cylindrical cells 2 together, increasing the structural strength of the cell module. Additionally, the bottom of the cylindrical cells 2 is fixed by a lower bracket 1, further enhancing the structural strength of the cell module.

[0016] In some embodiments, the lower support 1 is provided with a cell groove for accommodating the cylindrical battery cell 2. Further, the depth of the cell groove is 10-15 mm, so that the lower support 1 provides support for the cylindrical battery cell 2 without affecting the installation of the side liquid cooling plate 3.

[0017] In some embodiments, two adjacent rows of cells are staggered.

[0018] In some embodiments, the lower support 1 is made of PC material. A low-density material is used to reduce the weight of the lower support 1. Those skilled in the art may also choose other low-density materials known to them as needed.

[0019] A battery pack includes a housing and at least one cylindrical cell module. The housing accommodates the cylindrical cell module, and the bottom of the lower support 1 is connected to the bottom of the housing, specifically, by screws. This battery pack eliminates the need for seamless filling of a large amount of structural adhesive between the cell module and the battery housing, further reducing the amount of structural adhesive used.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0023] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A cylindrical battery cell module, characterized in that: The device includes a lower support, a busbar, a side liquid cooling plate, and a top liquid cooling plate. The lower support has at least one cell group, each cell group includes two cell columns, each cell column includes at least one cylindrical cell, and each cell group is provided with one side liquid cooling plate. The side liquid cooling plate is sandwiched between the two cell columns. The tops of all cylindrical cells are connected in series and parallel through the busbar. Thermally conductive structural adhesive is applied to the top of the busbar, and the thermally conductive structural adhesive completely covers the top of all cell groups. The top liquid cooling plate is attached to the top of the thermally conductive structural adhesive.

2. The cylindrical cell module according to claim 1, characterized in that: The lower support is provided with a cell slot for accommodating cylindrical cells.

3. The cylindrical battery cell module according to claim 2, characterized in that: The depth of the cell groove is 10-15mm.

4. The cylindrical battery cell module according to claim 1, characterized in that: The adjacent two cells are arranged in a staggered manner.

5. The cylindrical cell module according to claim 1, characterized in that: The lower bracket is made of PC material.

6. A battery pack, characterized in that: The device includes a housing and at least one cylindrical cell module as described in any one of claims 1-5, the housing being used to house the cylindrical cell module, and the bottom of the lower support being connected to the bottom of the housing.

Images