Battery cell module structure and battery pack

Abstract

The utility model provides a battery cell module structure and battery pack, the battery cell module structure of the utility model comprises two supports oppositely arranged along the preset direction and a plurality of cylindrical battery cells arranged between the two supports, each support comprises a substrate, and a plurality of oil liquid via holes and a plurality of support assemblies arranged on the substrate, each supporting assembly and each oil liquid via hole are arranged in a one-to-one correspondence manner, and two ends of each cylindrical battery cell respectively abut against a pair of corresponding supporting assemblies, so that circulation gaps communicated with the oil liquid via holes at the same end are respectively formed between the two ends of each cylindrical battery cell and the corresponding substrates; and a first circulation channel communicated with the oil liquid through holes in the two ends and the circulation gaps in the two ends is formed between any two adjacent cylindrical battery cells. According to the battery cell module structure disclosed by the utility model, the temperature of each part of the cylindrical battery cell can be ensured to be consistent while the cylindrical battery cell can be cooled.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cells, and in particular to a battery cell module structure. At the same time, the utility model also relates to a battery pack provided with the battery cell module structure. Background Art

[0002] With the country's vigorous promotion of new energy electric vehicles and electric motorcycles, the power battery sector is experiencing rapid development. Currently, cylindrical batteries are used as power batteries in a large number of electric vehicles both domestically and internationally due to their high power density, long cycle life, and low self-discharge rate.

[0003] However, due to the limited space on the vehicle, the large amount of heat generated by the battery during operation is affected by the space and accumulated, resulting in uneven temperature everywhere, thereby affecting the power and energy of the battery. In severe cases, it will also lead to thermal runaway, affecting the safety and reliability of the system.

[0004] At present, cylindrical lithium batteries are mostly cooled by serpentine liquid cooling and immersion oil cooling. The former has limited thermal conductivity and can no longer meet high-power performance requirements. The latter cools the battery through direct contact between the oil and the battery cell. However, when this method exchanges heat for the battery, its own temperature will gradually increase, and the cooling effect will decrease, which will lead to a certain temperature difference between the front and rear cells of the oil flow path, which is not conducive to ensuring the temperature consistency of various parts of the battery cell. Utility Model Content

[0005] In view of this, the present invention aims to provide a battery cell module structure that can cool down the cylindrical battery cell while ensuring that the temperature of each part of the cylindrical battery cell is consistent.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0007] A battery module structure includes two brackets arranged relative to each other along a preset direction, and a plurality of cylindrical battery cells disposed between the two brackets; each bracket includes a base plate, a plurality of oil holes and a plurality of support components provided on the base plate, and each support component is provided in a one-to-one correspondence with each oil hole;

[0008] The two ends of each cylindrical battery cell respectively abut against the corresponding two supporting components, so that a flow gap connected to the oil through-holes at the same end is formed between the two ends of the cylindrical battery cell and the corresponding substrate, and due to the separation of each supporting component, a first flow channel connected to the oil through-holes at both ends and the flow gaps at both ends is formed between any two adjacent cylindrical battery cells.

[0009] Furthermore, each of the support assemblies includes a plurality of support units arranged along the circumferential spacing corresponding to the oil through holes, and each of the support units is used to limit the spacing between two adjacent cylindrical battery cells and support the ends of the two cylindrical battery cells.

[0010] Furthermore, each of the support units includes two support blocks arranged along a circumferential spacing corresponding to the oil through-holes.

[0011] Furthermore, each of the support blocks is provided with support bosses along both sides of the corresponding oil through hole in a radial direction, and both ends of each of the cylindrical battery cells are respectively in contact with the support bosses of the corresponding support blocks.

[0012] Furthermore, it also includes a shell, in which the two brackets and the plurality of cylindrical battery cells are all arranged; an insulation layer is provided on the inner wall of the shell, and a second flow channel is formed between each of the cylindrical battery cells close to the insulation layer and the insulation layer.

[0013] Furthermore, the heat insulation layer is provided with mounting grooves corresponding to the respective brackets, and each mounting groove is used to install the corresponding bracket.

[0014] Furthermore, an adhesive layer is provided between each bracket and the corresponding mounting groove.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The battery cell module structure described in the present invention forms a flow gap between the cylindrical battery cell and the substrate by arranging a support component, and forms a first flow channel connecting the oil through-holes at both ends and the flow gaps at both ends, which is beneficial for the oil to directly cool each cylindrical battery cell and improve the cooling effect. At the same time, it is also beneficial to ensure that the flow rate and flow resistance of the oil are similar or the same, ensuring that the oil can flow through each cylindrical battery cell in parallel, so that the temperature of each cylindrical battery cell is kept consistent, which is beneficial to improving the problem of large temperature difference between the head and tail ends of the cylindrical battery cell, so that each part of each cylindrical battery cell can have good temperature consistency.

[0017] Secondly, the provision of each support unit can support the cylindrical battery cells to facilitate the flow of oil, and at the same time, can fix each cylindrical battery cell, thereby maintaining the position of each cylindrical battery cell and making the spacing between each cylindrical battery cell equal. Each support unit is composed of two support blocks, which has a simple structure and is easy to design and implement. At the same time, the provision of two support blocks is conducive to maintaining the balance of support for the cylindrical battery cells.

[0018] Furthermore, the provision of a supporting boss not only supports the cylindrical cell but also limits its axial freedom, thereby maintaining its stability. The provision of a thermal insulation layer reduces internal temperature transmission, thereby reducing oil usage and avoiding resource waste. Furthermore, the provision of a second flow channel creates a rational structure, further ensuring consistent temperatures across the cylindrical cell.

[0019] Furthermore, the mounting slots provide precise positioning for the bracket, facilitating assembly and providing stable support, thereby ensuring the stability of the bracket. The bracket and mounting slots are bonded together via an adhesive layer, simplifying operation and improving production efficiency. The strength of the connection between the bracket and mounting slot is also enhanced, reducing the weight of the battery pack.

[0020] Another object of the present invention is to provide a battery pack, which is provided with the battery cell module structure as described above.

[0021] The battery pack and cell module structure of the present invention have the same beneficial effects as those of conventional technologies and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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:

[0023] Figure 1 This is a schematic diagram of the overall structure of the battery cell module structure according to the first embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the assembly of the bracket and the housing according to the first embodiment of the present invention;

[0025] Figure 3 This is a cross-sectional view of a portion of the battery cell module structure according to the first embodiment of the present invention;

[0026] Figure 4 for Figure 3 A magnified view of the structure shown in the middle A;

[0027] Figure 5 This is a schematic diagram of the overall structure of the bracket according to the first embodiment of the present invention;

[0028] Figure 6 for Figure 5 A magnified view of the structure shown in B.

[0029] Description of reference numerals:

[0030] 1. Bracket; 11. Base plate; 12. Oil through hole; 13. Support assembly; 131. Support unit; 1311. Support block; 13111. Support boss; 13112. Limit block;

[0031] 2. Cylindrical battery cell; 21. First flow channel;

[0032] 3. Circulation gap;

[0033] 4. Shell; 41. Thermal insulation layer; 411. Second circulation channel; 412. Mounting groove. 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 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.

[0036] Taking the battery pack in which the cell module structure described in the present invention is located as an example, the directional words used in the embodiments, such as "up, down, left, right, front, back" are based on the Figure 1 The up-down direction (also called height direction, or Z direction of the whole package), left-right direction (also called length direction, or Y direction of the whole package), and front-back direction (also called width direction, or X direction of the whole package) in the shown state are defined as references.

[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 cell module structure, which can ensure that the temperature of various parts of the cylindrical battery cell is consistent while cooling the cylindrical battery cell.

[0041] In terms of overall structure, combined Figures 1 to 6 As shown in , the cell module structure of this embodiment includes two brackets 1 arranged opposite to each other along a preset direction, and a plurality of cylindrical cells 2 arranged between the two brackets 1. Each bracket 1 includes a substrate 11, a plurality of oil holes 12 and a plurality of support components 13 provided on the substrate 11, and each support component 13 is provided in a one-to-one correspondence with each oil hole 12;

[0042] At the same time, if Figure 3 、 Figure 4 and Figure 6 As shown in the figure, the two ends of the cylindrical battery core 2 are respectively abutted against the corresponding two support components 13, so that a flow gap 3 connected to the oil through-hole 12 at the same end is formed between the two ends of the cylindrical battery core 2 and the corresponding substrate 11, and due to the separation of each support component 13, a first flow channel 21 connected to the oil through-hole 12 at both ends and the flow gap 3 at both ends is formed between any two adjacent cylindrical battery cores 2.

[0043] At this time, as set above, by setting the support component 13, a flow gap 3 is formed between the cylindrical battery core 2 and the substrate 11, and a first flow channel 21 is formed to connect the oil through-holes 12 at both ends and the flow gaps 3 at both ends, which is beneficial for the oil to directly cool each cylindrical battery core 2 and improve the cooling effect. At the same time, it is also beneficial to ensure that the flow rate and flow resistance of the oil are similar or the same, and ensure that the oil can flow through each cylindrical battery core 2 in parallel, so that the temperature of each cylindrical battery core is kept consistent, so as to improve the problem of large temperature difference between the head and tail ends of the cylindrical battery core 2, so that each part of the cylindrical battery core 2 can have better temperature consistency.

[0044] It should be noted that the preset direction in this embodiment is the axial direction of the cylindrical battery cell 2, that is, Figure 1 The front-to-back direction shown in .

[0045] During specific implementation, a pair of corresponding support components 13 are used to support and fix the two axial ends of the cylindrical battery core 2, so that a flow gap 3 connected to the oil through-hole 12 at the same end is formed between the two ends of the cylindrical battery core 2 and the corresponding substrate 11. The oil flows through the oil through-hole 12 at one end and the flow gap 3 at the same end in turn, enters the first flow channel 21, cools the cylindrical battery core 2 for heat exchange, and then flows out from the flow gap 3 at the other end and the corresponding oil through-hole 12.

[0046] It is worth mentioning that each supporting assembly 13 can be connected to the bracket 1 by bonding. Of course, in addition to bonding, other common connection forms can also be used.

[0047] Based on the above overall introduction, this embodiment is a preferred implementation form, referring to Figure 5 and Figure 6 As shown in , each support assembly 13 includes a plurality of support units 131 arranged along the circumferential spacing of the corresponding oil through-hole 12 , and each support unit 131 is used to limit the spacing between two adjacent cylindrical battery cells 2 and support the ends of the two cylindrical battery cells 2 .

[0048] Thus, by providing each supporting unit 131 , the cylindrical battery cells 2 can be supported to facilitate the flow of oil. At the same time, each cylindrical battery cell 2 can be fixed, thereby maintaining the position of each cylindrical battery cell 2 and making the spacing between each cylindrical battery cell 2 equal.

[0049] In the specific structure, the number of support units 131 can be set and adjusted accordingly according to actual needs, and can be set to six or more. In this embodiment, the number of support units 131 is preferably set to six, that is, six support units 131 are arranged at circumferential intervals between each oil through hole 12. It should be noted that any two adjacent cylindrical battery cells 2 share one support unit 131, thereby facilitating cost reduction and improving the space utilization of the bracket 1.

[0050] Furthermore, in this embodiment, as a preferred implementation form, Figure 6 As shown in , each support unit 131 includes two support blocks 1311 arranged along the circumferential spacing of the corresponding oil through hole 12. It can be understood that each support unit 131 is composed of two support blocks 1311. This arrangement has a simple structure and is easy to design and implement. At the same time, the provision of two support blocks 1311 can help maintain the balance of the cylindrical battery cell 2 when supporting it.

[0051] Specifically, in this embodiment, as a preferred implementation form, continue to refer to Figure 6 As shown in , each support block 1311 is provided with support bosses 13111 on both sides of the corresponding oil through hole 12 in the radial direction, and both ends of each cylindrical battery core 2 are respectively abutted against the support bosses 13111 of the corresponding support block 1311 .

[0052] Here, the provision of the support bosses 13111 not only supports the cylindrical battery cell 2 but also limits the axial freedom of the cylindrical battery cell 2, thereby facilitating the stability of the cylindrical battery cell 2. In the specific structure, two adjacent cylindrical battery cells 2 respectively abut against the support bosses 13111 on both sides of the two support blocks 1311, so that the two adjacent cylindrical battery cells 2 share two support blocks 1311.

[0053] In the specific structure, each support block 1311 is provided with a limit block 13112 that extends axially of the cylindrical battery cell 2, and the limit block 13112 is arranged between the two supporting bosses 13111. Through the setting of each limit block 13112, the radial direction of each cylindrical battery cell 2 can be limited, so that the spacing between each cylindrical battery cell 2 can be kept consistent.

[0054] In addition, as a preferred embodiment, Figure 2 As shown in FIG, the battery module structure of this embodiment further includes a housing 4, in which the two brackets 1 and the plurality of cylindrical battery cells 2 are disposed. Furthermore, a heat insulating layer 41 is provided on the inner sidewall of the housing 4, and a second flow channel 411 is formed between each cylindrical battery cell 2 adjacent to the heat insulating layer 41 and the heat insulating layer 41.

[0055] Thus, the provision of the thermal insulation layer 41 can reduce internal temperature transmission, thereby reducing oil usage and avoiding resource waste. Furthermore, the provision of the second circulation channel 411 is structurally sound, allowing oil to flow through the second circulation channel 411, further ensuring consistent temperatures across all parts of the cylindrical battery cell 2.

[0056] It is worth mentioning that the thermal insulation layer 41 can be made of any thermal insulation board material known to those skilled in the art, such as epoxy resin board or mica board. It should also be noted that, in this embodiment, each support block 1311 adjacent to the thermal insulation layer 41 is provided with a support boss 13111 only on one side radially along the corresponding oil through hole 12 and away from the insulation layer.

[0057] Furthermore, considering the stability requirements of the bracket 1, in this embodiment, as a preferred embodiment, still refer to Figure 2 As shown in , the heat insulation layer 41 is provided with mounting grooves 412 corresponding to the respective brackets 1 , and each mounting groove 412 is used to mount the corresponding bracket 1 .

[0058] The advantage of this arrangement is that, through the provision of the mounting groove 412, it is possible to provide precise positioning for the bracket 1, facilitating the assembly of the bracket 1, and at the same time, it is possible to provide stable support for the bracket 1, thereby facilitating the stability of the bracket 1. In a specific implementation, the mounting groove 412 and the corresponding profile of the bracket 1 are adapted to each other, so that the bracket 1 can be accurately installed in the mounting groove 412.

[0059] At the same time, in this embodiment, as a preferred implementation form, an adhesive layer is provided between each bracket 1 and the corresponding mounting groove 412. Here, the bracket 1 and the mounting groove 412 are bonded together via the adhesive layer, which simplifies operation and helps improve production efficiency. It also improves the connection strength between the bracket 1 and the mounting groove 412 and can also reduce the weight of the battery pack.

[0060] Furthermore, it should be noted that the bonding layer in this embodiment can be made of bonding materials well known to those skilled in the art, such as adhesives, etc. Furthermore, it should be understood that in addition to bonding, other common connection methods can also be used between the bracket 1 and the corresponding mounting slot 412 in this embodiment.

[0061] When the battery module structure of this embodiment is in use, one bracket 1 is installed in the corresponding mounting groove 412, and each cylindrical battery cell 2 is assembled one by one on the corresponding support assembly 13, and another bracket 1 is installed in the corresponding mounting groove 412 to complete the assembly.

[0062] At the same time, both ends of each cylindrical battery core 2 are respectively abutted against the supporting protrusions on the two substrates 11 , so that a flow gap 3 communicating with the oil through hole 12 at the same end is formed between the two ends of each cylindrical battery core 2 and the corresponding substrate 11 .

[0063] And as Figure 1 As shown in FIG, in the width direction of the housing 4, each oil hole 12 on the front side of the housing 4 and the corresponding flow gap 3 constitute a liquid inlet, and each oil hole 12 on the rear side of the housing 4 and the corresponding flow gap 3 constitute a liquid outlet, with each liquid inlet and each liquid outlet corresponding to each other. Oil can flow into the housing 4 from each liquid inlet, flow through the first flow channel 21 between two adjacent cylindrical battery cells 2, and the second flow channel 411 between each cylindrical battery cell 2 near the thermal insulation layer 41 and the thermal insulation layer 41, and after cooling each cylindrical battery cell 2, it flows out of the housing 4 through the corresponding liquid outlet.

[0064] It is worth mentioning that when the oil flows in through each liquid inlet, a certain pressure can be applied to ensure that the oil can flow out from the corresponding liquid outlet, thereby achieving the same flow resistance between each cylindrical battery cell 2, allowing the oil to flow through each cylindrical battery cell 2 in parallel, and ensuring that the temperature of each part of the cylindrical battery cell 2 is consistent.

[0065] Example 2

[0066] This embodiment relates to a battery pack, and the liquid cooling plate is provided with the battery cell module structure in the first embodiment.

[0067] The battery pack of this embodiment is provided with the battery cell module structure of the first embodiment. By adopting the support assembly 13, a flow gap 3 is formed between the cylindrical battery cell 2 and the substrate 11, and a first flow channel 21 is formed to connect the oil through-holes 12 at both ends and the flow gap 3 at both ends. This is beneficial for the oil to directly cool each cylindrical battery cell 2, thereby improving the cooling effect. At the same time, it can also solve the problem of large temperature difference between the head and tail ends of the cylindrical battery cell 2, thereby making the temperature of each part of each cylindrical battery cell 2 consistent.

[0068] 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 cell module structure, characterized in that: It comprises two brackets arranged opposite to each other along a preset direction, and a plurality of cylindrical battery cells arranged between the two brackets; Each of the brackets includes a base plate, a plurality of oil through holes and a plurality of support components provided on the base plate, and each of the support components is provided in a one-to-one correspondence with each of the oil through holes; The two ends of each cylindrical battery cell respectively abut against the corresponding two supporting components, so that a flow gap connected to the oil through-holes at the same end is formed between the two ends of the cylindrical battery cell and the corresponding substrate, and due to the separation of each supporting component, a first flow channel connected to the oil through-holes at both ends and the flow gaps at both ends is formed between any two adjacent cylindrical battery cells.

2. The battery cell module structure according to claim 1, wherein: Each of the support assemblies includes a plurality of support units arranged along the circumferential spacing corresponding to the oil through holes, and each of the support units is used to limit the spacing between two adjacent cylindrical battery cells and support the ends of the two cylindrical battery cells.

3. The battery cell module structure according to claim 2, wherein: Each of the support units includes two support blocks arranged along a circumferential spacing corresponding to the oil through holes.

4. The battery cell module structure according to claim 3, wherein: Each of the support blocks is provided with support bosses on both sides of the corresponding oil through hole in a radial direction, and both ends of each of the cylindrical battery cells are respectively in contact with the support bosses of the corresponding support blocks.

5. The battery cell module structure according to claim 1, characterized in that: It also includes a shell, wherein the two brackets and the plurality of cylindrical battery cells are arranged in the shell; A heat insulation layer is provided on the inner side wall of the shell, and a second flow channel is formed between each of the cylindrical battery cores close to the heat insulation layer and the heat insulation layer.

6. The battery cell module structure according to claim 5, characterized in that: The heat insulation layer is provided with mounting grooves corresponding to the respective brackets, and each mounting groove is used for mounting the corresponding bracket.

7. The battery cell module structure according to claim 6, characterized in that: An adhesive layer is provided between each bracket and the corresponding mounting groove.

8. A battery pack, characterized in that: The battery pack is provided with the battery cell module structure according to any one of claims 1 to 7.

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