Battery module and battery
By using plastic fasteners in the battery module to tie the battery cell group and the end plate into one, the problems of poor insulation and high cost of steel strips are solved, and better insulation performance and cost-reducing effect are achieved.
Patent Information
- Application Number
- CN202420473820.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-12
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-03-12
AI Technical Summary
In the prior art, steel strips are used in sodium ion batteries with poor insulation properties and high cost.
Plastic fasteners are used to tie the battery cell set and end plate into one, and the insulation performance and cost are improved by adjusting the size and layout of the plastic fasteners.
The insulation performance of the battery module is improved, the overall cost is reduced, and the mechanical properties of the plastic fasteners meet the fastening requirements of the battery module.
Smart Images
Figure CN222620013U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of batteries, and in particular to a battery module and a battery. Background Art
[0002] With the development of new energy technology, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles and other terminal products. As the core component of the battery, the battery module usually needs a cable tie to fix the battery module together, so the insulation of the cable tie is required.
[0003] In the related art, lithium-ion batteries usually use steel materials as cable ties, but steel straps have poor insulation properties when used in sodium-ion batteries and have high costs. Utility Model Content
[0004] In view of this, the present application provides a battery module, which can solve the problem in the related art that the steel strip used for sodium ion batteries has poor insulation and high cost.
[0005] To solve the above problems, the technical solutions provided by this application are as follows:
[0006] The present application provides a battery module, comprising:
[0007] A battery cell group, comprising a plurality of sodium ion battery cells stacked along a first direction;
[0008] Two end plates are arranged on opposite sides of the battery cell group along the first direction;
[0009] The plastic fastener is sleeved on the battery cell group and the two end plates, and is configured to bundle the battery cell group and the two end plates into one.
[0010] In an optional embodiment of the present application, the ratio of the width of the plastic fastener along the second direction to the width of the sodium ion battery cell along the second direction is 1:(5-7), the ratio of the thickness of the plastic fastener along the first direction to the width of the plastic fastener along the second direction is (1-2):(30-40), and the first direction is arranged perpendicular to the second direction.
[0011] In an optional embodiment of the present application, the thickness of the plastic fastener along the first direction is 1 mm-2 mm, and the width of the plastic fastener along the second direction is 30 mm-40 mm.
[0012] In an optional embodiment of the present application, there are multiple plastic fasteners, and the multiple plastic fasteners are arranged at intervals along the second direction.
[0013] In an optional embodiment of the present application, the plurality of plastic fasteners are symmetrically arranged along the center line axis of the second direction.
[0014] In an optional embodiment of the present application, it also includes:
[0015] The insulating plate is arranged between the end plate and the battery cell group.
[0016] In an optional embodiment of the present application, opposite sides of the end plate and the insulating plate along a third direction are flush with opposite sides of the battery cell group along the third direction, wherein the third direction intersects with the first direction and the second direction respectively.
[0017] In an optional embodiment of the present application, the orthographic projections of the insulating plate, the end plate and the battery cell group in the same projection plane perpendicular to the first direction overlap with each other.
[0018] In an optional embodiment of the present application, it also includes:
[0019] The buffer layer is arranged between two adjacent sodium ion battery cells.
[0020] In a second aspect, the present application provides a battery, comprising:
[0021] The battery module described in any of the above embodiments.
[0022] The battery module and battery provided by the present application have at least the following beneficial effects:
[0023] The battery module provided in the present application uses plastic fasteners to bundle the end plates and the battery cell group into one. Compared with the solution of bundling with steel belts, the plastic fasteners have better insulation performance and are relatively lower in cost. Therefore, while improving the insulation, it helps to reduce the overall cost of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.
[0025] Figure 1 A schematic diagram of the structure of a battery module provided for a preferred embodiment of the present application.
[0026] Figure 2 A schematic structural diagram of a plastic fastener provided in a preferred embodiment of the present application.
[0027] Figure 3A top view of a battery module provided in a preferred embodiment of the present application.
[0028] Figure 4 for Figure 3 Schematic diagram of the structure of local A in the figure.
[0029] Reference numerals: 100, battery module; 10, battery cell group; 101, sodium ion battery cell; 20, end plate; 30, plastic fastener; 40, insulating plate; 50, buffer layer; 60, fixing block. DETAILED DESCRIPTION
[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.
[0031] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.
[0032] The present application may repeat reference numerals and / or reference letters in different implementations. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various implementations and / or settings discussed.
[0033] The battery module and battery provided in the present application will be described in detail below in conjunction with specific embodiments and drawings.
[0034] See also Figure 1 , Figure 2 and Figure 3 The present application provides a battery module 100, comprising:
[0035] A battery cell group 10, two end plates 20 respectively arranged on opposite sides of the battery cell group 10 along a first direction X, and a plastic fastener 30 sleeved on the battery cell group 10 and the two end plates 20, wherein the plastic fastener 30 is configured to bundle the battery cell group 10 and the two end plates 20 into one.
[0036] Specifically, the battery cell group 10 includes a plurality of sodium ion battery cells 101 stacked along a first direction X. The number of the sodium ion battery cells 101 is not limited in the present application and is subject to actual application.
[0037] The battery module 100 provided in the embodiment of the present application uses a plastic fastener 30 to bundle the end plate 20 and the battery cell group 10 together. Since the insulation of the plastic fastener 30 is better than the insulation of the steel strip in the related art, the use of the plastic fastener 30 for bundling helps to improve the insulation performance. In addition, the expansion force of the sodium ion battery is lower than that of the lithium ion battery. The mechanical properties of the steel strip used in the sodium ion battery are redundant, and the steel strip has a high cost. Replacing the steel strip with the plastic fastener 30 helps to reduce the overall cost of the battery module 100 while providing sufficient mechanical properties.
[0038] In one embodiment of the present application, the ratio of the width of the plastic fastener 30 along the second direction Z to the width of the sodium ion battery cell 101 along the second direction Z is 1:(5-7), the ratio of the thickness of the plastic fastener 30 along the first direction X to the width of the plastic fastener 30 along the second direction is (1-2):(30-40), and the first direction X is arranged perpendicular to the second direction Z.
[0039] Specifically, the width of the sodium ion battery cell 101 along the second direction Z can be 204 mm, for example, but is not limited to this. The ratio between the width of the plastic fastener 30 along the second direction Z and the width of the sodium ion battery cell 101 along the second direction Z is 1:(5-7), which varies according to the adaptability of the width of the sodium ion battery cell 101 along the second direction Z.
[0040] Further, the ratio between the thickness of the plastic fastener 30 along the first direction X and the width of the plastic fastener 30 along the second direction Z may be 1:30 or 2:40, depending on the adaptability of the size of the sodium ion battery housing.
[0041] In an embodiment of the present application, the thickness of the plastic fastener 30 along the first direction X is 1 mm-2 mm, and the width of the plastic fastener 30 along the second direction Z is 30 mm-40 mm.
[0042] In the related art, the thickness of the steel strip is usually less than 1 mm. In the embodiment of the present application, the thickness of the plastic fastener 30 along the first direction X is preferably 1.2 mm-2 mm, and the width of the plastic fastener 30 along the second direction Z is preferably 30 mm-35 mm. The size of the plastic fastener 30 in the embodiment of the present application meets the tensile requirements of the battery module 100, and improves the tensile strength and yield strength of the fastener compared to the steel strip.
[0043] In an embodiment of the present application, there are multiple plastic fasteners 30 , and the multiple plastic fasteners 30 are arranged at intervals along the second direction Z.
[0044] Specifically, based on the width of the sodium ion battery shell and the width range of the plastic fastener 30, the number of the plastic fasteners 30 is preferably two, and the two plastic fasteners 30 are arranged along the second direction Z. The plastic fasteners 30 surround the battery cell group 10 and the end plate 20 to fix the battery cell group 10 and the end plate 20 as a whole. The number of the plastic fasteners 30 is not limited and varies according to the actual application adaptability.
[0045] Furthermore, two of the outermost plastic fasteners 30 along the second direction Z of the plurality of plastic fasteners 30 are at a certain distance from the edge of the sodium ion battery cell 101 along the second direction Z. The design of the distance meets the fastening requirements of the battery module 100 and ensures a stable bundling effect.
[0046] In an embodiment of the present application, the plurality of plastic fasteners 30 are symmetrically arranged along the center line of the second direction Z.
[0047] Specifically, the plastic fastener 30 is ensured to be tightly attached to the peripheral side of the sodium ion battery cell 101 , thereby improving the overall stability of the battery module 100 .
[0048] In one embodiment of the present application, the plastic fastener 30 is made of polyethylene terephthalate (PET) material, which meets the tensile strength requirements of sodium ion batteries for fasteners.
[0049] In one embodiment of the present application, a battery module 100 further includes an insulating plate 40 disposed between the end plate 20 and the battery cell group 10 and configured to isolate the end plate 20 from the battery cell group 10 to avoid the risk of short circuit in the battery module 100 .
[0050] See also Figure 3 and Figure 4In one embodiment of the present application, the opposite sides of the end plate 20 and the insulating plate 40 along the third direction Y are flush with the opposite sides of the battery cell group 10 along the third direction Y, wherein the third direction Y intersects with the first direction X and the second direction Z respectively.
[0051] Specifically, the third direction Y and the first direction X are perpendicular to each other, the third direction Y and the second direction Z are perpendicular to each other, and the first direction X and the second direction Z are perpendicular to each other.
[0052] It can be understood that the end plate 20 and the insulating plate 40 have a first width along the third direction Y, the sodium ion battery cell 101 has a second width along the third direction Y, the first width is equal to the second width, and the opposite side edges of the end plate 20 and the insulating plate 40 along the third direction Y are flush with the opposite side edges of the sodium ion battery cell 101 along the third direction Y, which is convenient for assembly.
[0053] Specifically, in the related art, the portion of the steel strip located at the battery cell group along the first direction X is usually coated with an insulating layer, which gives the steel strip an insulating effect, and the steel strip does not contact the battery cell group to cause a short circuit. The thickness of the insulating layer is usually 0.5 mm. When the steel strip is fixed on the battery cell group, there is a thickness distance of 0.5 mm between the steel strip and the battery cell, which increases the space occupied by the battery module in the casing and reduces the space utilization.
[0054] In addition, in the related art, part of the steel strip is not covered with an insulating layer. To avoid short circuit, the width of the end plate and the insulating plate along the third direction Y is usually greater than the width of the battery cell along the third direction Y, so that the part of the steel strip not covered with the insulating layer does not contact the outer shell of the battery cell. However, this method will result in space waste and is not conducive to the structural compactness of the battery module.
[0055] In the embodiment of the present application, the plastic fastener 30 itself has good insulation and does not need to be coated with an insulating layer, which can reduce the cost of the battery module, reduce the space occupied by the fastener in the battery module 100, and improve the space utilization. In addition, the width of the end plate 20 and the insulating plate 40 along the third direction Y is equal to the width of the sodium ion battery cell 101, and the plastic fastener 30 is closely attached to the periphery of the battery module 100 without any gap or clearance, thereby further improving the space utilization and saving the material cost of the end plate 20 and the insulating plate 40.
[0056] In one embodiment of the present application, the orthographic projections of the insulating plate 40 , the end plate 20 , and the battery cell group 10 in the same projection plane perpendicular to the first direction X overlap with each other.
[0057] It can be understood that the orthographic projection area of the insulating plate 40 and the end plate 20 in the first direction X on the sodium ion battery cell 101 is equal to the orthographic projection area of the sodium ion battery cell 101 along the first direction X, so that the end plate 20 and the insulating plate 40 are easy to assemble with the battery cell group 10, reducing the difficulty of assembling the battery module 100.
[0058] In one embodiment of the present application, a battery module 100 further includes:
[0059] The fixing block 60 is disposed on the end plate 20 .
[0060] Specifically, the battery module 100 further includes related components such as a bus bar, and the fixing block 60 is configured to fix the bus bar to prevent the bus bar from contacting the end plate 20 and causing a short circuit.
[0061] In one embodiment of the present application, a battery module 100 further includes:
[0062] The buffer layer 50 is disposed between two adjacent sodium ion battery cells 101 .
[0063] Specifically, the material of the buffer layer 50 may be, for example, foam, but is not limited thereto, and the specific material shall depend on actual application.
[0064] In a second aspect, the present application also provides a battery, comprising:
[0065] Square housing;
[0066] The battery module described in any of the above embodiments is arranged in the square casing.
[0067] A battery module provided by the present application includes at least the following beneficial effects or working principles: the battery module 100 includes a battery cell group 10, two end plates 20 respectively arranged on opposite sides of the battery cell group 10 along a first direction X, and a plastic fastener 30 sleeved on the battery cell group 10 and the two end plates 20, the plastic fastener 30 is configured to bundle the battery cell group 10 and the two end plates 20 into one, meeting the bundling requirements and fastening requirements of the battery module 100. The plastic fastener 30 is made of PET material, which meets the insulation requirements and mechanical properties, improves insulation and space utilization, and reduces costs. The opposite sides of the end plate 20 and the insulating plate 40 along the third direction Y are flush with the opposite sides of the sodium ion battery 101 along the third direction Y, and the plastic fastener 30 is closely attached to the periphery of the battery cell group 10, reducing the gap or gap between the plastic fastener 30 and the battery cell group 10, further improving the space utilization and insulation, and reducing costs.
[0068] In summary, although the present application has been disclosed as above with preferred embodiments, the above preferred embodiments are not intended to limit the present application. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined in the claims.
Claims
1. A battery module, characterized in that: include: A battery cell group, comprising a plurality of sodium ion battery cells stacked along a first direction; Two end plates are arranged on opposite sides of the battery cell group along the first direction; The plastic fastener is sleeved on the battery cell group and the two end plates, and is configured to bundle the battery cell group and the two end plates into one.
2. The battery module according to claim 1, characterized in that: The ratio of the width of the plastic fastener along the second direction to the width of the sodium ion battery cell along the second direction is 1:(5-7), the ratio of the thickness of the plastic fastener along the first direction to the width of the plastic fastener along the second direction is (1-2):(30-40), and the first direction and the second direction are arranged perpendicular to each other.
3. The battery module according to claim 2, characterized in that: The thickness of the plastic fastener along the first direction is 1 mm-2 mm, and the width of the plastic fastener along the second direction is 30 mm-40 mm.
4. The battery module according to any one of claims 1 to 3, characterized in that: There are multiple plastic fasteners, and the multiple plastic fasteners are arranged at intervals along the second direction.
5. The battery module according to claim 4, characterized in that: The plurality of plastic fasteners are symmetrically arranged along the center line of the second direction.
6. The battery module according to claim 1, characterized in that: Also includes: The insulating plate is arranged between the end plate and the battery cell group.
7. The battery module according to claim 6, characterized in that: Two opposite sides of the end plate and the insulating plate along a third direction are flush with two opposite sides of the battery cell group along the third direction, wherein the third direction intersects the first direction and the second direction respectively.
8. The battery module according to claim 7, characterized in that: The orthographic projections of the insulating plate, the end plate and the battery cell group in the same projection plane perpendicular to the first direction overlap with each other.
9. The battery module according to claim 1, characterized in that: Also includes: The buffer layer is arranged between two adjacent sodium ion battery cells.
10. A battery, characterized in that: include: A battery module as claimed in any one of claims 1 to 9.