Quadrangular prism type battery and battery device
By using a thin insulating layer in the battery to replace the Mira film and combine the thermal conductivity of the steel shell, the problem of slow heat dissipation speed is solved, and higher energy density and safety and stability are achieved.
Patent Information
- Application Number
- CN202421059572.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-05-15
AI Technical Summary
In the existing batteries, the thickness of the Mail film is thicker, resulting in a slow heat dissipation speed of the battery cell to the shell.
The thin insulation layer (less than or equal to 0.1mm) is used instead of the wheat membrane, at least four surfaces of the insulation layer covering the battery cell, and the heat conduction effect of the steel shell is used to improve the heat dissipation effect of the cell.
The heat dissipation speed of the battery cell is increased, the risk of damage when the battery pack enters the shell, and at the same time improves the energy density and safety and stability of the battery.
Smart Images
Figure CN222422112U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a quadrangular prism battery and a battery device. Background Art
[0002] In the related art, the battery includes a shell and a cell, and the surface of the cell is wrapped with a Mylar film to protect the cell. However, the Mylar film is relatively thick, which will affect the heat dissipation speed of the cell to the shell.
[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content
[0004] The utility model provides a quadrangular prism type battery, which can solve the technical problem of slow heat dissipation speed of the battery core.
[0005] The quadrangular prism battery includes:
[0006] Shell: the shell is a steel shell;
[0007] A battery cell group, the battery cell group is at least partially located in the housing, and the battery cell group includes one or more battery cells;
[0008] The insulating layer is located between the battery cell group and the shell, and covers at least four surfaces of the battery cell group, and the thickness of the insulating layer is less than or equal to 0.1 mm.
[0009] The battery provided by the utility model replaces the Mylar film with a thinner insulating layer. On the one hand, since the shell is a steel shell, the steel shell is not easy to corrode, and the thinner insulating layer can protect the battery cell group; on the other hand, the insulating layer is coated on the outer surface of the battery cell group, and the insulating layer can reinforce the battery cell group to avoid the battery cell group being too loose, thereby reducing the risk of the battery cell group being scratched by the shell when the battery cell group enters the shell; on the other hand, the thinner insulating layer has a better thermal conductivity, and the thinner insulating layer will not take up too much space in the shell, thereby improving the energy density of the battery.
[0010] The utility model also provides a battery device, which includes the above-mentioned quadrangular prism battery. The battery cell group in the battery has a higher heat dissipation speed, and the battery cell group is not easily damaged by the shell, so that the battery device also has good safety and stability.
[0011] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing.
[0013] in:
[0014] Figure 1 It is a schematic structural diagram of an exemplary embodiment of a quadrangular prism battery disclosed in the present invention;
[0015] Figure 2 for Figure 1 A cross-sectional view of the quadrangular prism-shaped battery along the dashed line AA;
[0016] Figure 3 for Figure 1 The shown quadrangular prism-shaped battery is a cross-sectional view taken along the dotted line AA from another viewing angle.
[0017] Description of reference numerals:
[0018] 1. Shell; 11. Bottom plate; 12. Side plate; 2. Cell group; 21. Cell; 3. Insulation layer 4. Bottom support plate; 6. Arc chamfer. DETAILED DESCRIPTION
[0019] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.
[0020] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.
[0021] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.
[0022] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to one or more "upper", "lower", or "inner", "outer" of another element, it can not only be directly connected to the "upper", "lower", "inner", "outer" of another element or elements, but can also be indirectly connected to the "upper", "lower", "inner", "outer" of another element or elements through an intermediate element.
[0023] In the description of the embodiments of the present application, the term "and / or" is merely a term used to describe the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist at the same time, and B exists alone.
[0024] This exemplary embodiment first provides a quadrangular prism type battery, such as Figure 1-3 As shown, Figure 1 This is a schematic structural diagram of an exemplary embodiment of a quadrangular prism battery disclosed in the present invention. Figure 2 for Figure 1 The cross-sectional view of the quadrangular prism type battery along the dotted line AA is shown. Figure 3 for Figure 1 The shown quadrangular prism-shaped battery is a cross-sectional view taken along the dotted line AA from another viewing angle.
[0025] like Figure 1-3 As shown, the quadrangular prism battery includes: a shell 1, a battery cell group 2, and an insulating layer 3, wherein the shell 1 is a steel shell; the battery cell group 2 is at least partially located in the shell 1, and the battery cell group 2 includes one or more battery cells 21; the insulating layer 3 is located between the battery cell group 2 and the shell 1, and the insulating layer 3 covers at least four surfaces of the battery cell group 2, and the thickness of the insulating layer 3 is less than or equal to 0.1 mm.
[0026] The quadrangular prism battery provided in this exemplary embodiment replaces the Mylar film with a thinner insulating layer 3. On the one hand, since the shell 1 is a steel shell, the steel shell is not easy to corrode, and the thinner insulating layer 3 can protect the battery cell group 2; on the other hand, the insulating layer 3 is coated on the outer surface of the battery cell group 2, and the insulating layer 3 can reinforce the battery cell group 2 to prevent the battery cell group 2 from being too loose, thereby reducing the risk of the battery cell group 2 being scratched by the shell 1 when the battery cell group 2 enters the shell 1; on the other hand, the thinner insulating layer 3 has a better thermal conductivity, and the thinner insulating layer 3 will not take up too much space in the shell 1, thereby improving the energy density of the battery.
[0027] It should be noted that, in this exemplary embodiment, the housing 1 may be a steel shell such as stainless steel, carbon steel or nickel-plated steel.
[0028] In this exemplary embodiment, the thickness of the insulating layer 3 may be equal to 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, etc. Preferably, the thickness of the insulating layer 3 may be less than or equal to 70 μm. For example, the thickness of the insulating layer 3 may be equal to 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, etc.
[0029] In this exemplary embodiment, the material of the insulating layer 3 may include one or more of polyimide, polytetrafluoroethylene, polyetheretherketone, and polyamide.
[0030] In this exemplary embodiment, the insulating layer 3 may be bonded to the outer surface of the battery cell group. This arrangement may improve the reinforcing effect of the insulating layer 3 on the battery cell group.
[0031] In this exemplary embodiment, Figure 1-3 As shown, the thickness of the shell 1 can be 0.1mm-0.4mm. For example, the thickness of the shell 1 can be equal to 0.1mm, 0.12mm, 0.14mm, 0.16mm, 0.18mm, 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm, 0.32mm, 0.34mm, 0.36mm, 0.38mm, 0.4mm, etc. If the thickness of the shell 1 is too large, the space utilization rate inside the battery is too small, which will affect the energy density of the battery; if the thickness of the shell 1 is too small, the strength of the shell is insufficient, and the shell is easily deformed under the action of external force. In this exemplary embodiment, the thickness of the shell 1 is set to a suitable size, which can ensure the energy density of the battery and the strength of the shell at the same time.
[0032] In this exemplary embodiment, Figure 1-3 As shown, the housing 1 may further include a bottom plate 11, which is used to support the battery cell group 2. The quadrangular prism battery further includes: a bottom support plate 4, which is located between the bottom plate 11 and the battery cell group 2. The bottom plate 11 can support the battery cell group through the bottom support plate 4. The bottom plate 11 of the housing is prone to deformation. When the bottom plate 11 is deformed, the bottom support plate 4 can buffer and protect the battery cell group 2 to reduce the risk of damage to the battery cell group 2.
[0033] In this exemplary embodiment, Figure 1-3As shown, the ratio of the thickness of the bottom support plate 4 to the thickness of the insulating layer 3 is 2-15. For example, the ratio of the thickness of the bottom support plate 4 to the thickness of the insulating layer 3 can be equal to 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, etc. If the ratio of the thickness of the bottom support plate 4 to the thickness of the insulating layer 3 is too large, the thickness of the bottom support plate 4 is too large, and the space utilization rate inside the shell is low, which will reduce the energy density of the battery; if the ratio of the thickness of the bottom support plate 4 to the thickness of the insulating layer 3 is too small, the thickness of the bottom support plate 4 is too small, and the bottom support plate 4 is difficult to support the battery cell group 2 well. At the same time, the corner positions of the battery cell group 2 and the bottom support plate 4 are prone to interference, thereby causing damage to the battery cell group 2. In this exemplary embodiment, the ratio of the thickness of the bottom support plate 4 to the thickness of the insulating layer 3 is set to a suitable size, which can not only ensure the energy density of the battery, but also achieve good support of the bottom support plate 4 to the battery cell group 2.
[0034] In this exemplary embodiment, Figure 1-3 As shown, the housing 1 may further include a side plate 12 surrounding the edge of the bottom plate 11. The insulating layer 3 may be wrapped on the outer surface of the side plate 12. The housing includes four side plates, and the insulating layer 3 may be wrapped on the outer surfaces of the four side plates 12.
[0035] In other exemplary embodiments, the insulating layer 3 may also be wrapped on the outer surface of the bottom plate 11, and the insulating layer 3 may be connected to the bottom support plate 4 by heat-melting to fix the battery cell group 2 on the bottom support plate 4. When the thickness of the bottom support plate 4 is too large, more heat is required for the heat-melting of the bottom support plate 4, and more heat is likely to damage the insulating layer 3. Therefore, in this exemplary embodiment, the ratio of the thickness of the bottom support plate 4 to the thickness of the insulating layer 3 is set to a suitable size, which can also facilitate the fixing of the bottom support plate 4 and the insulating layer 3.
[0036] In this exemplary embodiment, Figure 1-3 As shown, the thickness of the bottom support plate 4 can be less than or equal to 0.28 mm. For example, the thickness of the bottom support plate 4 can be equal to 0.28 mm, 0.26 mm, 0.24 mm, 0.22 mm, 0.20 mm, 0.18 mm, 0.16 mm, 0.14 mm, 0.12 mm, 0.1 mm, etc.
[0037] In this exemplary embodiment, Figure 1-3As shown, the ratio of the area of the orthographic projection of the bottom support plate 4 on the bottom plate 11 to the area of the bottom plate 11 is less than or equal to 0.99. For example, the ratio of the area of the orthographic projection of the bottom support plate 4 on the bottom plate 11 to the area of the bottom plate 11 can be equal to 0.99, 0.98, 0.97, 0.96, 0.95, 0.94, 0.93, 0.92, 0.91, 0.90, 0.89, 0.88, 0.87, 0.86, 0.85, 0.84, 0.83, 0.82, 0.81, 0.80, 0.75, 0.7, etc. A too large ratio of the area of the orthographic projection of the bottom support plate 4 on the bottom plate 11 to the area of the bottom plate 11 will affect the heat dissipation speed of the battery cell group 2. In this exemplary embodiment, the ratio of the area of the orthographic projection of the bottom support plate 4 on the bottom plate 11 to the area of the bottom plate 11 is set to an appropriate size, so as to facilitate the heat dissipation of the battery cell group 2 to the shell 1 through the bottom support plate 4.
[0038] In this exemplary embodiment, Figure 1-3 As shown, the elastic modulus of the insulating layer 3 is 0.8 GPa-5.5 GPa. For example, the elastic modulus of the insulating layer 3 can be equal to 0.8 GPa, 1 GPa, 1.5 GPa, 2 GPa, 2.5 GPa, 3 GPa, 3.5 GPa, 4 GPa, 4.5 GPa, 5 GPa, 5.5 GPa, etc.
[0039] If the elastic modulus of the insulating layer 3 is too small, the reinforcing effect of the insulating layer 3 on the battery cell group 2 is weak; if the elastic modulus of the insulating layer 3 is too large, when the battery cell group 2 expands, the insulating layer 3 exerts a large force on the battery cell group 2, and the battery cell group 2 is easily squeezed and damaged by the insulating layer 3. In this exemplary embodiment, the elastic modulus of the insulating layer 3 is set to a suitable size, which can not only improve the reinforcing effect of the insulating layer 3 on the battery cell group 2, but also reduce the risk of the battery cell group 2 being squeezed and damaged by the insulating layer 3 when it expands.
[0040] In this exemplary embodiment, Figure 1-3 As shown, the housing 1 includes a bottom plate 11 and a side plate 12, and the bottom plate 11 and the side plate 12 are transitionally connected by a circular chamfer 6, and the arc of the circular chamfer 6 is less than or equal to 105°. For example, the arc of the circular chamfer 6 can be equal to 105°, 100°, 95°, 90°, 85°, 80°, 75°, 70°, etc. In this exemplary embodiment, the circular chamfer 6 is set to a smaller arc, so that the space utilization inside the battery can be improved.
[0041] In this exemplary embodiment, Figure 1-3As shown, the battery cell 21 is a wound battery cell or a laminated battery cell. The battery cell may include a battery cell body and a tab. The battery cell body includes a stacked positive electrode sheet, a negative electrode sheet, and a separator between the positive and negative electrode sheets. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer located on at least one side of the positive electrode collector. The negative electrode sheet may include a negative electrode collector and a negative electrode active material layer located on at least one side of the negative electrode collector. The tab includes a positive tab and a negative tab. The positive tab is connected to the positive electrode collector in the positive electrode sheet. For example, the positive tab can be formed by cutting the positive electrode collector material layer. The negative tab is connected to the negative electrode collector in the negative electrode sheet. For example, the negative tab can be formed by cutting the negative electrode collector material layer. The positive electrode active material of the lithium-ion battery may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode active material may be graphite, silicon, etc. During charging, lithium ions are separated from the positive electrode active material and move through the electrolyte to the negative electrode active material. The lithium ions are embedded in the interlayer gaps of the carbon material, completing the battery charging process. During discharging, lithium ions are separated from the negative electrode active material and move through the electrolyte to the positive electrode active material, completing the battery discharging process.
[0042] In this exemplary embodiment, Figure 1-3 As shown, when the battery cell 21 is a wound battery cell, the battery cell 21 includes open end surfaces arranged opposite to each other along the winding axis, and the electrolyte can quickly enter the battery cell through the open end surfaces, and at the same time, the gas inside the battery cell can be quickly released through the open end surfaces. In this exemplary embodiment, the open end surfaces of the battery cell 21 can be located at the upper part and the lower part of the battery cell.
[0043] In this exemplary embodiment, the insulating layer 3 covers the surface other than the open end surface of the battery cell group 2. This arrangement can prevent the insulating layer 3 from blocking the electrolyte from entering the battery cell, and can also prevent the insulating layer 3 from blocking the release of gas inside the battery cell.
[0044] In this exemplary embodiment, the quadrangular prism battery can be a lithium-ion battery. It should be understood that in other exemplary embodiments, the quadrangular prism battery can also be a nickel-cadmium battery, a nickel-metal hydride battery, a lithium polymer battery, a sodium-ion battery, a solid-state battery, etc.
[0045] In this exemplary embodiment, the quadrangular prism battery mainly refers to a battery having a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and can be arc transitions.
[0046] The battery can be a laminated battery, which is not only convenient to group, but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, which has a first pole piece stacked on top of each other, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery cell.
[0047] Alternatively, the battery may be a wound battery, that is, a first pole sheet, a second pole sheet with electrical properties opposite to the first pole sheet, and a diaphragm sheet arranged between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.
[0048] The exemplary embodiment further provides a battery device, which is a battery module or a battery pack.
[0049] The battery module includes a plurality of quadrangular prism-shaped batteries. The battery module may further include an end plate and a side plate, and the end plate and the side plate are used to fix the plurality of batteries.
[0050] The battery pack includes a plurality of quadrangular prism-shaped batteries and a box body, wherein the box body is used for fixing the plurality of quadrangular prism-shaped batteries.
[0051] It should be noted that the battery pack includes a quadrangular prism battery, and the battery may be multiple, and the multiple batteries are arranged in the box. Among them, the multiple batteries can be installed in the box after forming a battery module. Alternatively, the multiple batteries can be directly arranged in the box, that is, there is no need to group the multiple batteries, and the box is used to fix the multiple batteries.
[0052] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing what is disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and embodiments are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.
[0053] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures may refer to the usual design. In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments. It should be understood by those of ordinary skill in the art that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and should be included in the scope of the claims of the present disclosure.
[0054] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims
1. A quadrangular prism battery, characterized in that: The quadrangular prism battery comprises: A housing (1), wherein the housing (1) is a steel shell; A battery cell group (2), the battery cell group (2) being at least partially located in the housing (1), the battery cell group (2) comprising one or more battery cells (21); An insulating layer (3) is located between the battery cell group (2) and the shell (1), the insulating layer (3) covers at least four surfaces of the battery cell group (2), and the thickness of the insulating layer (3) is less than or equal to 0.1 mm.
2. The quadrangular prism battery according to claim 1, characterized in that: The thickness of the insulating layer (3) is less than or equal to 70 μm.
3. The quadrangular prism battery according to claim 1, characterized in that: The thickness of the shell (1) is 0.1 mm-0.4 mm.
4. The quadrangular prism battery according to claim 1, characterized in that: The housing (1) further comprises: A bottom plate (11), the bottom plate (11) being used to support the battery cell group (2); The quadrangular prism battery further comprises: A bottom support plate (4) located between the bottom plate (11) and the battery cell group (2); The ratio of the thickness of the bottom support plate (4) to the thickness of the insulating layer (3) is 2-15.
5. The quadrangular prism battery according to claim 4, characterized in that: The thickness of the bottom support plate (4) is less than or equal to 0.28 mm.
6. The quadrangular prism battery according to claim 4, characterized in that: The ratio of the area of the orthographic projection of the bottom support plate (4) on the bottom plate (11) to the area of the bottom plate (11) is less than or equal to 0.
99.
7. The quadrangular prism battery according to claim 1, characterized in that: The housing (1) comprises a bottom plate (11) and a side plate (12); the bottom plate (11) and the side plate (12) are transitionally connected via a circular chamfer (6); the arc of the circular chamfer (6) is less than or equal to 105°.
8. The quadrangular prism battery according to any one of claims 1 to 7, characterized in that: The elastic modulus of the insulating layer (3) is 0.8 GPa-5.5 GPa.
9. The quadrangular prism battery according to any one of claims 1 to 7, characterized in that: The battery core (21) is a wound battery core or a laminated battery core.
10. The quadrangular prism battery according to any one of claims 1 to 7, characterized in that: The battery core (21) is a wound battery core, the battery core (21) comprises open end surfaces arranged opposite to each other along its winding axis, and the insulating layer (3) covers the surface of the battery core group (2) other than the open end surfaces.
11. The quadrangular prism battery according to any one of claims 1 to 7, characterized in that: The insulating layer (3) is bonded to the outer surface of the battery cell group.
12. A battery device, characterized in that: The battery device comprises the quadrangular prism battery according to any one of claims 1 to 11.