Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack. The battery module comprises two battery cell groups which are stacked in the height direction, each battery cell group comprises a plurality of battery cells which are arranged in parallel along the width direction of the battery module, the battery cells are flat, and the longest sides of the battery cells are parallel to the length direction of the battery module; a positive pole and a negative pole of each battery cell are respectively arranged at two ends of the battery cell in the length direction, and the positive poles and the negative poles are alternately arranged on each battery cell on the same side of the battery cell group with the poles. According to the battery module disclosed by the utility model, the energy density of the battery module is increased by arranging the two stacked battery cell groups consisting of the plurality of battery cells, and meanwhile, compared with a single-layer battery module in the prior art, the space in the height direction can be utilized, and the occupied space in the horizontal direction is reduced; the flexibility of installation and arrangement of the battery module is improved, so that the space utilization rate of the battery module is improved.

Description

Technical Field

[0001] The utility model relates to the field of battery technology, and in particular to a battery module. The utility model also relates to a battery pack provided with the battery module. Background Art

[0002] With the rapid development of new energy vehicles, energy storage systems, and other fields, battery modules, as core components of these devices, are crucial to the operation of the entire system through their performance, safety, and reliability. In recent years, with the continuous advancement of battery technology, battery module design has also been continuously innovated to meet the ever-increasing requirements for energy density, power density, and safety.

[0003] Existing battery modules often use a single-layer arrangement of cells, with all cells located on the same plane. While this design is simple, it also suffers from low space utilization and limited energy density. Utility Model Content

[0004] In view of this, the present invention aims to provide a battery module that can improve the space utilization and energy density of the battery module.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0006] A battery module comprises two cell groups stacked in a height direction; each cell group comprises a plurality of cells arranged in parallel along the width direction of the battery module, the cells are flat, and the longest sides of the cells are parallel to the length direction of the battery module; the positive electrode column and the negative electrode column of each cell are respectively arranged at both ends in the length direction of the cell, and on the same side of the cell group having the electrodes, the positive electrode column and the negative electrode column are alternately arranged on each cell.

[0007] Furthermore, in the battery cell group, a plane formed by the longest side of the battery cell and the shortest side of the battery cell is located at the upper and lower sides of the battery cell group.

[0008] Furthermore, the two battery cell groups are connected by gluing; or a spacer component is sandwiched between the two battery cell groups, and the spacer component is connected to the battery cell groups by gluing.

[0009] Furthermore, the spacer component is one of an insulating plate, a heat conducting plate, and an electric heating film.

[0010] Furthermore, the spacer assembly is a liquid cooling plate with a flow channel formed therein, and the liquid cooling plate is formed with an extension portion extending toward the outside of the battery module, and the extension portion is provided with a pair of cooling liquid connectors communicating with the flow channel.

[0011] Furthermore, an elastic buffer material is sandwiched between two adjacent battery cells.

[0012] Furthermore, it also includes side panels arranged on both sides of the width direction of the battery module; the side panels cover the side surfaces of the two battery cell groups; and / or the side panels are configured as two plates, and the two plates are respectively attached to one side of each battery cell group.

[0013] Furthermore, it also includes a cable tie for bundling the two battery cell groups; the cable tie is configured to be arranged in a plurality of intervals along the length direction of the battery module, and the cable tie can constrain each of the battery cells in the width direction and height direction of the battery module.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] The battery module described in the present invention increases the energy density of the battery module by arranging two stacked cell groups composed of multiple battery cells. At the same time, compared with the single-layer battery module in the prior art, it can utilize the space in the height direction and reduce the space occupied in the horizontal direction, so as to improve the flexibility of the installation arrangement of the battery module, thereby improving the space utilization rate of the battery module.

[0016] Furthermore, the planes formed by the longest and shortest sides of the battery cells are located above and below the cell group, allowing the cells to be arranged vertically, further reducing the horizontal space occupied by the battery module. Adhesive bonding or the placement of a spacer between the two cell groups can enhance the overall structural strength of the battery module while also providing a buffer between the two cell groups. The spacer provides additional support for the upper cell group.

[0017] In addition, the spacer component is one of an insulating plate, a heat-conducting plate, and an electric heating film, which can ensure the insulation between the battery cell groups, or can effectively conduct heat to reduce the temperature difference between each battery cell, or can generate heat to heat each battery cell, so as to keep each battery cell in a suitable temperature range in a cold use environment, thereby improving the working efficiency of the battery module. The spacer component is a liquid cooling plate with a flow channel formed inside, which is used to cool and dissipate heat for each battery cell, ensure the normal operation of each battery cell, and reduce the risk of thermal runaway of the battery cell. An elastic buffer material is provided between two adjacent battery cells to prevent the battery cells from being too closely fitted and damaged.

[0018] Furthermore, the side panels protect both sides of the battery module. The side panels can be made of insulating material to improve the insulation of the battery module. Multiple cable ties are arranged at intervals along the length of the battery module, resulting in a simple and reliable structure that enhances the overall structural strength of the battery module. The smaller size of the rolled strips reduces the space occupied by the battery module and reduces the assembly cost and time.

[0019] Another object of the present invention is to provide a battery pack, in which the battery module as described above is provided.

[0020] The battery pack and / or the above-mentioned battery module described in the present invention have the same technical effects as those of the prior art, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of the battery module according to the first embodiment of the present invention;

[0023] Figure 2 This is a schematic structural diagram of two battery cell groups according to the first embodiment of the present invention;

[0024] Figure 3 This is a front view of the battery module according to the first embodiment of the present invention;

[0025] Figure 4 For the utility model Figure 3 A magnified view of the position shown in middle A;

[0026] Description of reference numerals:

[0027] 1. Battery cell group; 101. Battery cell;

[0028] 101a, longest side; 101b, shortest side; 101c, second longest side;

[0029] 102, positive electrode column; 103, negative electrode column; 104, pole piece;

[0030] 2. Spacer assembly; 201. Extension portion; 202. Coolant connector;

[0031] 3. Buffer material;

[0032] 4. Side panels; 401. Board body;

[0033] 5. Cable tie. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0035] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0036] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0037] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "mounted," "connected," "connection," and "connector" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0039] Example 1

[0040] This embodiment relates to a battery module for supplying power to electrical equipment such as vehicles, engineering machinery or energy storage systems. Figure 1 、 Figure 2 As shown, the overall structure includes two battery cell groups 1 stacked in the height direction.

[0041] Each cell group 1 includes multiple cells 101 arranged side by side along the width of the battery module. The cells 101 are flat, with their longest sides 101a parallel to the length of the battery module. The positive and negative electrodes 102, 103 of each cell 101 are located at either end of the length. On the same side of the cell group 1, the positive and negative electrodes 102, 103 are arranged alternately on each cell 101.

[0042] As described above, by providing two stacked battery cell groups 1 consisting of multiple battery cell groups 1, the energy density of the battery module is increased. At the same time, compared with the single-layer battery module in the prior art, the space in the height direction can be utilized and the space occupied in the horizontal direction can be reduced to improve the flexibility of the battery module installation arrangement, thereby improving the space utilization of the battery module.

[0043] Based on the above overall introduction, specifically, the battery cell 101 of this embodiment adopts a long and thin battery cell 101, and the longest side 101a and the second longest side 101c of the battery cell 101, that is, the ratio of the length side to the width side of the battery cell 101 is not less than 2.5, to ensure that the battery cell 101 is a longer thin-sheet battery cell 101 as a whole, so as to increase the number of battery cells 101 arranged in each battery cell group 1.

[0044] Furthermore, the alternating arrangement of the positive electrode posts 102 and the negative electrode posts 103 on any cell group 1 facilitates connecting the individual cells 101 in series, facilitating connection of the individual cells 101. In a specific implementation, in any cell group 1, adjacent positive electrode posts 102 and negative electrode posts 103 are connected via pole pieces 104. Since one positive electrode post 102 and one negative electrode post 103 are not connected on each of the two cells 101 located at opposite ends of the same cell group 1, the positive electrode posts 102 and negative electrode posts 103 on the two cells 101 located on the same side between the two cell groups 1 are connected via pole pieces 104, thereby connecting the two cell groups 1 in series.

[0045] In order to make full use of the space in the height direction of the battery module and reduce the space occupied in the horizontal direction, such as Figure 2As shown, in the battery cell group 1 of this embodiment, the planes formed by the longest side 101a of the battery cell 101 and the shortest side 101b of the battery cell 101, that is, the planes formed by the length side and thickness side of the battery cell 101, are located on the upper and lower sides of the battery cell group 1. It can be understood that the above-mentioned planes are located on the upper and lower sides of the battery cell group 1, so that the secondary longest side 101c of the battery pack is perpendicular to the width direction of the battery module. The end faces with the largest areas of each battery cell 101 are affixed to each other, so that each battery cell 101 is arranged in a vertical manner. In this case, the shortest side 101b of each battery cell 101 is parallel to the width direction of the battery module. Compared with other arrangements of battery cells 101, this reduces the space occupied in the horizontal direction and increases the height of the battery module, thereby improving the space utilization of the battery module and facilitating the flexible arrangement of the battery module.

[0046] To improve the connection strength between the two battery cell groups 1, the two battery cell groups 1 of this embodiment are connected by gluing. Specifically, the two battery cell groups 1 can be bonded using structural adhesive or thermally conductive adhesive. This can connect two adjacent battery cells 101 together in the height direction, thereby improving the overall structural strength of the battery module and preventing the battery cells 101 in the two battery cell groups 1 from separating and being damaged by vibration. The gluing connection also acts as a buffer between the two battery cell groups 1, further improving the protection of the battery cells 101.

[0047] In addition, as another implementation form, Figure 3 As shown, a spacer assembly 2 is sandwiched between the two battery cell groups 1 in this embodiment, and the spacer assembly 2 is connected to the battery cell group 1 by gluing. The spacer assembly 2 can provide additional support for the upper battery cell group 1, further improving the overall structural strength of the battery module.

[0048] Specifically, the spacer component 2 of this embodiment is one of an insulating plate, a heat conducting plate, and an electric heating film. When the spacer component 2 adopts an insulating plate, the spacer component 2 can effectively separate the two battery cell groups 1, prevent the battery cell 101 from leaking electrolyte due to its own failure or external force, and affect the normal operation of the other battery cell group 1, ensure the insulation between the battery cell groups 1, and improve the safety of the battery module. In addition, when the spacer component 2 adopts a heat conducting plate, the heat conducting plate can effectively conduct heat to reduce the temperature difference between each battery cell 101, so that the temperature inside the battery module is evenly distributed, which helps to improve the overall performance and stability of the battery module. Furthermore, when the spacer component 2 adopts an electric heating film, the electric heating film can generate heat and heat each battery cell 101, so that each battery cell 101 is kept in a suitable temperature range in a cold operating environment, thereby improving the working efficiency of the battery module.

[0049] As another specific implementation form, the spacer assembly 2 of this embodiment is a liquid cooling plate with a flow channel formed inside, and the liquid cooling plate is formed with an extension portion 201 extending toward the outside of the battery module, and a pair of coolant connectors 202 connected to the flow channel are provided on the extension portion 201. Through the provision of the liquid cooling plate, the liquid cooling plate as the spacer assembly 2 can contact each battery cell 101 and cool and dissipate heat for each battery cell 101, ensuring the normal operation of each battery cell 101 and reducing the risk of thermal runaway of the battery cell 101. The provision of the extension portion 201 and the coolant connector 202 thereon can facilitate the connection of the liquid cooling plate with an external coolant pipeline. In a specific implementation, since the battery module is provided with a pole and a pole piece 104 at both ends in the longitudinal direction, in order to prevent coolant leakage from causing a short circuit in the battery cell 101 or corrosion of the pole piece 104 and the pole, the extension portion 201 of this embodiment extends outside the battery module along the width direction of the battery module.

[0050] In this embodiment, if Figure 4 As shown, an elastic buffer material 3 is sandwiched between two adjacent battery cells 101. In a specific implementation, the buffer material 3 can be conventional buffer materials 3 such as foam, which are well known to those skilled in the art. The provision of the buffer material 3 maintains a certain distance between the battery cells 101, preventing the battery cells 101 from being too closely fitted together and easily damaged by vibration or external forces. At the same time, when the volume of the battery cells 101 changes due to temperature fluctuations, the provision of the buffer material 3 provides a certain amount of deformation space for the battery cells 101, preventing the battery cells 101 from being squeezed and damaged.

[0051] The battery module of this embodiment also includes side panels 4 provided on both sides of the battery module in the width direction. The side panels 4 cover the side surfaces of the two battery cell groups 1. As another embodiment, the side panels 4 are configured as two plate bodies 401, and the two plate bodies 401 are respectively attached to one side of each battery cell group 1. By providing the side panels 4, protection can be provided for both side surfaces of the battery module. Moreover, the side panels 4 can be made of insulating material to improve the insulation effect of the battery module to a certain extent. In a specific implementation, since the extension portion of the liquid cooling plate is provided on one side of the battery module, the side panel 4 on the side of the battery module close to the extension portion is configured as two plate bodies 401, and the side panel 4 on the other side of the battery module directly covers the side surfaces of the two battery cell groups 1 to ensure the protective effect of the side panels 4 on the battery module.

[0052] Finally, in order to fix each battery cell 101, this embodiment further includes a tie 5 for bundling two battery cell groups 1. Figure 1As shown, the cable ties 5 are arranged in multiple configurations spaced apart along the length of the battery module. Their simple and reliable structure constrains each battery cell 101 in both the width and height of the battery module, thereby enhancing the overall structural strength of the module. Furthermore, the relatively small size of the cable ties reduces the space occupied by the battery module and increases the flexibility of its installation. Furthermore, the cable ties make assembly and disassembly of the battery cells 101 simpler and faster, reducing assembly costs and time.

[0053] In summary, the battery module of this embodiment increases the energy density of the battery module by arranging two stacked battery cell groups 1 composed of multiple battery cell groups 1. At the same time, compared with the single-layer battery module in the prior art, it can utilize the space in the height direction and reduce the space occupied in the horizontal direction to improve the flexibility of the installation and arrangement of the battery module, thereby improving the space utilization of the battery module and having good practicality.

[0054] Example 2

[0055] This embodiment relates to a battery pack, which includes a battery module as described in the first embodiment.

[0056] Specifically, the battery pack of this embodiment is installed on an electrical device such as a vehicle, construction machinery, or energy storage system, and includes a battery housing and the battery module described above, which is located within the battery pack housing. The battery pack housing of this embodiment can be a separate housing structure, or it can be integrated into the electrical device.

[0057] The battery pack of this embodiment, through the arrangement of the above-mentioned battery module, takes advantage of the characteristics of the battery module with high energy density and space utilization, can fully utilize the space inside the battery pack shell, increase the number of battery cells 101 arranged in the battery pack, and thus improve the capacity of the battery pack.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery module, characterized in that: It includes two battery cell groups stacked in the height direction; Each of the battery cell groups includes a plurality of battery cells arranged in parallel along the width direction of the battery module, the battery cells are flat, and the longest side of the battery cells is parallel to the length direction of the battery module; The positive electrode column and the negative electrode column of each battery cell are respectively arranged at both ends in the length direction of the battery cell. On the same side of the battery cell group having the electrodes, the positive electrode column and the negative electrode column are alternately arranged on each battery cell.

2. The battery module according to claim 1, wherein: In the battery cell group, a plane formed by the longest side of the battery cell and the shortest side of the battery cell is located at the upper and lower sides of the battery cell group.

3. The battery module according to claim 1, wherein: The two battery cell groups are connected by gluing; Or a spacer component is sandwiched between the two battery cell groups, and the spacer component is connected to the battery cell group by gluing.

4. The battery module according to claim 3, wherein: The spacer component is one of an insulating plate, a heat conducting plate and an electric heating film.

5. The battery module according to claim 3, wherein: The spacer assembly is a liquid cooling plate with a flow channel formed therein, and the liquid cooling plate is formed with an extension portion extending toward the outside of the battery module, and the extension portion is provided with a pair of cooling liquid connectors communicating with the flow channel.

6. The battery module according to claim 1, wherein: A buffer material with elasticity is sandwiched between two adjacent battery cells.

7. The battery module according to claim 1, wherein: It also includes side panels arranged on both sides of the battery module in the width direction; The side panels cover the sides of the two battery cell groups; and / or, The side plate is configured as two plate bodies, and the two plate bodies are respectively attached to one side of each battery cell group.

8. The battery module according to any one of claims 1 to 7, characterized in that: Also included is a cable tie for bundling the two battery cell groups; The cable ties are configured to be arranged in a plurality at intervals along the length direction of the battery module, and the cable ties can constrain the battery cells in the width direction and the height direction of the battery module.

9. A battery pack, characterized in that: The battery pack is provided with the battery module according to any one of claims 1 to 8.

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