Battery module

Abstract

The utility model provides a battery module which comprises at least two battery cell groups, and each battery cell group comprises a plurality of single battery cells which are arranged in a laminated manner; the at least one first isolation layer is arranged between the two adjacent battery cell groups, and the two sides of the first isolation layer are respectively attached to the side surface of one battery cell group; the two end plates are respectively arranged at one ends of the battery cell groups; the two side plates are arranged on the sides, away from the end plates, of the battery modules respectively, and the two ends of each side plate are fixedly connected with the two end plates respectively; and the at least one pressing strip is positioned between the top surfaces of the two adjacent battery cell groups, and the two ends of the pressing strip are fixedly connected with the end plates respectively. According to the battery module disclosed by the utility model, the pressing strip is arranged between the top surfaces of the adjacent battery cell groups, the two ends of the pressing strip are fixedly connected with the end plates respectively, and the pressing strip applies pressing force between the top surfaces of the adjacent battery cell groups, so that the displacement of the battery cell groups in the vertical direction is effectively prevented; and the safety and the reliability of the battery module in the battery pack box body in the using process are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery module. Background Art

[0002] In the design and application of battery modules, traditional battery modules are usually arranged in a single row, that is, multiple single cells are stacked and arranged to form a cell group, and the cell group is fixed by two end plates and straps to form a single-row battery module. However, in the actual application of electric vehicles and other battery-driven devices, in order to meet higher energy requirements, multiple battery modules are usually required inside the battery pack. When installing single-row battery modules in the battery pack box, it is usually necessary to reserve installation and fixing gaps. Such a design causes multiple single-row battery modules to occupy more space in the box, limiting the effective use of the internal space of the battery pack, thereby reducing the energy density of the entire battery pack.

[0003] To address these issues, existing technologies have proposed dual-row battery module designs. For example, patent publication number CN219203406U discloses a dual-row battery module without side panels. This design involves arranging two rows of battery cells side by side, installing end panels on the large ends of each row, and then binding the end panels and cell groups with steel straps to form a dual-row battery module. This design integrates two single-row battery modules to a certain extent, reducing the installation space in the battery pack and improving space utilization, but it also exposes new problems.

[0004] Specifically, when the dual-row battery cell pack is secured with straps, the connection between the two rows of battery cell packs is not effectively fixed. This means that after the dual-row battery module is installed in the battery box, the middle part is not fully fixed in the height direction, causing the dual-row battery cell pack to move up and down. This movement not only affects the installation stability of the battery module, but may also have a negative impact on the overall performance and safety of the battery module. Therefore, the structure of the existing dual-row battery module still needs to be further optimized to improve its stability and reliability in the battery pack. Utility Model Content

[0005] In view of this, the present invention proposes a battery module, which aims to solve the problem in the prior art that the connection between the double-row battery cell groups in the battery module is not effectively fixed, resulting in the battery cell groups possibly moving up and down after being installed in the battery box.

[0006] The technical solution of the present utility model is achieved as follows:

[0007] The utility model provides a battery module, comprising:

[0008] At least two battery cell groups, each of which includes a plurality of stacked single battery cells;

[0009] At least one first isolation layer, the first isolation layer being disposed between two adjacent battery cell groups, with both sides of the first isolation layer respectively affixed to the side surfaces of one of the battery cell groups;

[0010] Two end plates are respectively arranged at one end of the battery cell group and in contact with the large surface of the single battery cell;

[0011] Two side plates are respectively arranged on the side of the battery module away from the end plate, and the two ends of the side plates are respectively fixedly connected to the two end plates;

[0012] At least one pressure strip is located between the top surfaces of two adjacent battery cell groups, and both ends of the pressure strip are fixedly connected to the end plates respectively.

[0013] On the basis of the above technical solution, preferably, a second isolation layer is provided between two adjacent single battery cells in the battery cell group.

[0014] On the basis of the above technical solution, preferably, the end plate includes a sheet metal box and a first reinforcement, and multiple first reinforcements are fixedly arranged at intervals along the length direction of the sheet metal box. Bolt holes are opened in the vertical direction on the sheet metal box and the first reinforcement. The first reinforcement facing the first isolation layer on the sheet metal box and one end of the pressure strip are connected by bolts.

[0015] Furthermore, preferably, a second reinforcement is horizontally arranged between two adjacent first reinforcements, and the second reinforcement is fixedly connected to the sheet metal box and the first reinforcement respectively.

[0016] Furthermore, preferably, a plurality of connection seats are provided at intervals on the top surface of the pressure strip, and the connection seats are used for fixed connection with the upper box cover of the battery box.

[0017] Preferably, weight-reducing holes are provided on the sheet metal box and the side panels.

[0018] On the basis of the above technical solution, preferably, a second isolation layer is provided between two adjacent single battery cells in the battery cell group.

[0019] Furthermore, preferably, the first isolation layer and the second isolation layer are both one or more of an insulating layer, a heat-insulating layer and a buffer layer.

[0020] On the basis of the above technical solution, preferably, a first foam layer is further provided between the pressure strip and the top surfaces of two adjacent battery cell groups.

[0021] Furthermore, preferably, a second foam layer is provided between the end plate and the battery cell group, and an insulating layer is provided between the second foam layer and the battery cell group and between the battery cell group and the side plate.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The battery module disclosed in the present invention provides a pressure strip between the top surfaces of adjacent battery cell groups, and the two ends of the pressure strip are fixedly connected to the end plates. The pressure strip applies a pressing force between the top surfaces of adjacent battery cell groups, effectively preventing the battery cell groups from being displaced in the vertical direction, significantly improving the structural stability of the battery module, and ensuring the safety and reliability of the battery module during use in the battery pack box.

[0024] (2) The first reinforcement member on the sheet metal box facing the first isolation layer and one end of the pressure strip are connected by bolts. According to this arrangement, when the battery module is placed in the battery pack case, the pressure strip is placed between the top surfaces of two adjacent battery cell groups. The bolts can pass through the end of the pressure strip, the sheet metal box and the first reinforcement member and be fixedly connected to the battery pack case, so that the pressure strip can press the battery cell group in the height direction, ensuring that after the battery module is fixedly installed in the battery pack case, the battery cell group in the battery module will not move in the height direction, thereby improving the structural stability of the battery module.

[0025] (3) By designing the first and second isolation layers as a combination of one or more materials selected from the group consisting of an insulating layer, a heat-insulating layer, and a buffer layer, the battery module is more comprehensively protected. This multifunctional isolation layer not only improves the electrical safety between the individual battery cells, but also effectively reduces the risk of heat conduction, further enhancing the heat resistance of the battery module. In addition, the introduction of the buffer layer can absorb expansion deformation and vibration shock, reducing physical damage to the battery cell group, and overall improving the safety, reliability, and service life of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of the three-dimensional structure of the battery module disclosed in the present utility model;

[0028] Figure 2 This is an exploded schematic diagram of the battery module disclosed in the present utility model;

[0029] Reference numerals:

[0030] 1. Battery cell group; 10. Single battery cell; 2. First isolation layer; 3. End plate; 4. Side plate; 5. Pressure strip; 31. Sheet metal box; 32. First reinforcement; 33. Second reinforcement; L. Weight reduction hole; 51. Connecting seat; 11. Second isolation layer; M1. First foam layer; M2. Second foam layer; P. Insulation layer. DETAILED DESCRIPTION

[0031] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] like Figure 1 As shown, combined Figure 2 The utility model discloses a battery module, including at least two battery cell groups 1, at least one first isolation layer 2, two end plates 3, two side plates 4 and at least one pressure strip 5.

[0033] Among them, each battery cell group 1 is composed of several stacked single battery cells 10, which makes the basic structure of the battery module composed of multiple battery cell groups 1, thereby forming a double-row battery module, or a multi-row battery module, which can improve the energy density of the overall battery module. This embodiment only shows the structural form of a double-row battery module, but it is not limited to being set as a multi-row battery module.

[0034] The first isolation layer 2 is arranged between two adjacent battery cell groups 1. The two sides of the first isolation layer 2 are respectively attached to the side of a battery cell group 1. The first isolation layer 2 can effectively prevent direct contact between the two adjacent battery cell groups 1. It is worth noting that the first isolation layer 2 is in contact with the side (narrow side) of the single battery cell 10 in the battery cell group 1.

[0035] The battery module includes two end plates 3, one at each end of the cell group 1 and in contact with the larger surface of the individual cells 10. The end plates 3 provide support for the cell group 1, maintaining its structural integrity and preventing deformation of the individual cells 10 due to expansion forces. They also protect the individual cells 10 from external forces.

[0036] Two side panels 4 are provided on either side of the battery module, located away from the end panels 3. The ends of the side panels 4 are fixedly connected to the two end panels 3. This structural arrangement helps increase the overall structural strength of the battery module, allowing the battery cell group 1 to remain stable when subjected to external forces while preventing lateral deformation of the battery cell group 1.

[0037] A pressure strip 5 is positioned between the top surfaces of two adjacent cell groups 1, with both ends of the pressure strip 5 fixedly connected to the end plates 3. The pressure strip 5 provides additional compression to the cell groups 1, preventing vertical movement or deformation. The pressure strip 5 ensures the stability of the cell groups 1 during assembly and use.

[0038] The battery module disclosed by the present utility model provides a pressure strip 5 between the top surfaces of adjacent battery cell groups 1, and fixes the two ends of the pressure strip 5 to the end plates 3 respectively. The pressure strip 5 applies a pressing force between the top surfaces of adjacent battery cell groups 1, effectively preventing the displacement of the battery cell groups 1 in the vertical direction, significantly improving the structural stability of the battery module, and ensuring the safety and reliability of the battery module during use in the battery pack case.

[0039] This embodiment illustrates a preferred structural form for the end plate 3. Specifically, the end plate 3 comprises a sheet metal box 31 and a first reinforcement member 32. The sheet metal box 31 forms the primary framework of the end plate 3, providing basic support and protection. In this embodiment, the opening of the sheet metal box 31 faces the outside of the battery module, allowing the end faces of the sheet metal box 31 to contact the end faces of the cell pack 1. The longitudinal side faces of the sheet metal box 31 also facilitate bolt connection to the side panels 4. The sheet metal box 31 is concave, facilitating the placement of the first reinforcement member 32 therein.

[0040] Multiple first reinforcements 32 are fixedly arranged at intervals along the length of the sheet metal box 31. These multiple first reinforcements 32 provide segmented reinforcement, giving the end plate 3 greater strength and rigidity when subjected to loads. Vertical bolt holes are provided in the sheet metal box 31 and the first reinforcements 32. Bolts can be passed through these holes to securely connect the battery pack casing and the battery module, thereby securing the battery module within the casing.

[0041] The first reinforcement 32 on the sheet metal box 31 facing the first isolation layer 2 and one end of the pressure strip 5 are connected by bolts. In this way, when the battery module is placed in the battery pack case, the pressure strip 5 is placed between the top surfaces of two adjacent battery cell groups 1. Bolts can be passed through the end of the pressure strip 5, the sheet metal box 31 and the first reinforcement 32 and fixedly connected to the battery pack case, so that the pressure strip 5 can press the battery cell group 1 in the height direction, ensuring that after the battery module is fixedly installed in the battery pack case, the battery cell group 1 in the battery module will not move in the height direction, thereby improving the structural stability of the battery module.

[0042] Preferably, a second reinforcement member 33 is horizontally disposed between two adjacent first reinforcement members 32. The second reinforcement member 33 is fixedly connected to the sheet metal box 31 and the first reinforcement member 32. The provision of the second reinforcement member 33 further enhances the structural strength and rigidity of the entire end plate 3, thereby improving the structural strength of the battery module.

[0043] As some preferred embodiments, the sheet metal box 31 and the side panels 4 are provided with weight-reducing holes L. This arrangement can reduce the amount of material used and reduce the weight of the battery module.

[0044] As some preferred embodiments, a plurality of connection seats 51 are provided at intervals on the top surface of the pressure strip 5 , and the connection seats 51 are used for fixed connection with the upper box cover of the battery box.

[0045] By providing multiple connection sockets 51 on the top surface of the holding strip 5, this design achieves a secure connection between the holding strip 5 and the upper cover of the battery box. This not only effectively compresses the battery cell pack 1, preventing its vertical displacement, but also more tightly secures the battery module within the battery box via the connection sockets 51, further improving the stability of the battery module within the battery box and reducing the risk of loosening or displacement during installation, thereby enhancing the reliability and safety of the entire battery pack.

[0046] Preferably, a second isolation layer 11 is provided between two adjacent single cells 10 in the cell group 1. This arrangement can prevent the two adjacent single cells 10 from contacting each other, thereby improving the reliability of the cell group 1.

[0047] In this embodiment, the first isolation layer 2 and the second isolation layer 11 are both one or more of an insulating layer, a heat-insulating layer, and a buffer layer. Thus, the first isolation layer 2 and the second isolation layer 11 have multiple functions, and different materials can be combined and selected according to actual needs.

[0048] When the first isolation layer 2 and the second isolation layer 11 are used as insulating layers, the function of the insulating layers is to prevent electrical short circuits between the battery cell groups 1 and between the single battery cells 10 , thereby ensuring the electrical safety of the battery module.

[0049] When the first isolation layer 2 and the second isolation layer 11 serve as thermal insulation layers, the function of the thermal insulation layers is to reduce heat conduction between the battery cell groups 1 and between the individual battery cells 10 , thereby preventing overheating of a single battery cell 10 from affecting the performance and safety of adjacent battery cell groups 1 .

[0050] When the first isolation layer 2 and the second isolation layer 11 serve as buffer layers, the buffer layers absorb the expansion and deformation of the single battery cells 10 and alleviate the vibration of the single battery cells 10 caused by external forces, thereby protecting the battery cell group 1 and extending the life of the battery module.

[0051] By designing the first and second isolation layers 2 and 11 as a combination of one or more materials—insulating, thermally insulating, and buffer layers—the battery module achieves more comprehensive protection. This multifunctional isolation layer not only improves electrical safety between individual battery cells 10 but also effectively reduces the risk of heat conduction, further enhancing the heat resistance of the battery module. Furthermore, the buffer layer absorbs expansion deformation and vibration shock, reducing physical damage to the battery cell pack 1 and ultimately improving the safety, reliability, and service life of the battery module.

[0052] In the above embodiment, the first isolation layer 2 and the second isolation layer 11 can be any insulating plastic sheet, such as a polypropylene sheet or a polyamide sheet. The first isolation layer 2 and the second isolation layer 11 can also be insulating foam plastic sheets, such as a polyurethane foam sheet. The first isolation layer 2 and the second isolation layer 11 can also be aerogel insulation sheets.

[0053] In some preferred embodiments, a first foam layer M1 is further disposed between the holding strip 5 and the top surfaces of two adjacent battery cell groups 1. The first foam layer M can provide additional shock absorption and protection between the battery cell groups 1, helping to alleviate the pressure exerted by the holding strip 5 on the battery cell groups 1 and absorbing vibrations that may be generated by the battery cell groups 1 during operation.

[0054] In some preferred embodiments, a second foam layer M2 is provided between the end plate 3 and the cell group 1. This second foam layer M2 absorbs the expansion and deformation forces of the cell group 1. Furthermore, when the battery module is impacted by an external force, the force acting on the end plate 3 can be absorbed by the second foam layer M2, preventing the impact force from directly acting on the individual cells 10 and improving the safety of the battery module. An insulating layer P is provided between the second foam layer M2 and the cell group 1, and between the cell group 1 and the side plate 4. The function of the insulating layer P is to prevent electrical short circuits between the cell group 1 and other metal components (such as the end plate 3 and side plate 4), thereby ensuring the electrical safety of the battery module.

[0055] 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: include: At least two battery cell groups (1), each of the battery cell groups (1) comprising a plurality of stacked single battery cells (10); at least one first isolation layer (2), the first isolation layer (2) being arranged between two adjacent battery cell groups (1), and both sides of the first isolation layer (2) being respectively in contact with the side surfaces of one of the battery cell groups (1); Two end plates (3) are respectively arranged at one end of the battery cell group (1) and are in contact with the large surface of the single battery cell (10); Two side plates (4) are respectively arranged on one side of the battery module away from the end plate (3), and two ends of the side plates (4) are respectively fixedly connected to the two end plates (3); At least one pressure strip (5) is located between the top surfaces of two adjacent battery cell groups (1), and both ends of the pressure strip (5) are fixedly connected to the end plates (3) respectively.

2. The battery module according to claim 1, wherein: The end plate (3) comprises a sheet metal box (31) and a first reinforcement member (32), a plurality of first reinforcement members (32) are fixedly arranged at intervals along the length direction of the sheet metal box (31), the sheet metal box (31) and the first reinforcement member (32) are provided with bolt holes in the vertical direction, and the first reinforcement member (32) on the sheet metal box (31) facing the first isolation layer (2) and one end of the pressure strip (5) are connected by bolts.

3. The battery module according to claim 2, wherein: A second reinforcement member (33) is horizontally arranged between two adjacent first reinforcement members (32), and the second reinforcement member (33) is fixedly connected to the sheet metal box (31) and the first reinforcement member (32) respectively.

4. The battery module according to claim 2, wherein: The sheet metal box (31) and the side plate (4) are both provided with weight-reducing holes (L).

5. The battery module according to claim 1, wherein: A plurality of connection seats (51) are arranged at intervals on the top surface of the pressure strip (5), and the connection seats (51) are used for fixed connection with the upper box cover of the battery box.

6. The battery module according to claim 1, wherein: A second isolation layer (11) is provided between two adjacent single battery cells (10) in the battery cell group (1).

7. The battery module according to claim 6, wherein: The first isolation layer (2) and the second isolation layer (11) are both one or more of an insulating layer, a heat-insulating layer and a buffer layer.

8. The battery module according to claim 1, wherein: A first foam layer (M1) is also provided between the pressure strip (5) and the top surfaces of two adjacent battery cell groups (1).

9. The battery module according to claim 1, wherein: A second foam layer (M2) is further provided between the end plate (3) and the battery cell group (1), and an insulating layer (P) is provided between the second foam layer (M2) and the battery cell group (1), and between the battery cell group (1) and the side plate (4).

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