Battery structure and electric device

Abstract

The utility model belongs to battery technical field, concretely relates to a battery structure and electric equipment, wherein, the battery structure includes casing, insulating expansion body and electric core body, the casing includes bottom shell and apron, the bottom shell with apron is connected with each other and defines the installation cavity in common, the electric core body sets up in the inside of installation cavity, and is equipped with the assembly gap between electric core body and bottom shell, the insulating expansion body is connected in the inner wall of bottom shell, and sets up in the inside of assembly gap, at least one side end on the insulating expansion body is bent and sets up to electric core body. The utility model can improve the space utilization of casing inside, reduce the technological procedure of processing operation, further ensure the assembly stability of electric core body, and be favorable to the compactness of overall structure, can also ensure the dressing width and improve the energy density.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and in particular relates to a battery structure and electrical equipment. Background Technology

[0002] To address the serious global issues of energy crisis, environmental pollution, climate change, and the development of a low-carbon economy, lithium batteries have seen rapid growth, with their application in transportation vehicles such as electric vehicles, electric bicycles, and power tools, as well as energy storage, becoming an inevitable trend. Lithium batteries include pouch cells and cylindrical cells, among others.

[0003] Some existing cylindrical batteries require a grooving process; however, the existing grooving process occupies the space at the head of the casing, and the height of the cell body is limited. Therefore, the overall structure of the cylindrical battery cannot meet the design space requirements, and it will reduce its energy density (ED), affecting its stability and safety in use. Utility Model Content

[0004] The purpose of this utility model is to provide a battery structure and electrical device that addresses the shortcomings of existing technologies and solves the technical problem of low energy density in existing technologies.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A battery structure includes a casing, an insulating expansion body, and a battery cell body; the casing includes a bottom shell and a cover plate; the bottom shell and the cover plate are connected to each other to define a mounting cavity; the battery cell body is disposed inside the mounting cavity, and an assembly gap is provided between the battery cell body and the bottom shell; the insulating expansion body is connected to the inner wall of the bottom shell and disposed inside the assembly gap; at least one end of the insulating expansion body is bent toward the battery cell body.

[0007] Preferably, a first installation gap is provided between the insulating expansion body and the battery cell body;

[0008] And / or, the insulating expansion body is provided with at least one mesh; the mesh is arranged through the thickness direction of the insulating expansion body.

[0009] Preferably, the insulating expansion body includes an expansion adhesive layer and an insulating layer stacked together; the expansion adhesive layer is connected to the bottom shell; and the insulating layer abuts against the side surface of the battery cell body.

[0010] Preferably, the thickness D1 of the insulating expansion body satisfies: 0.03mm ≤ D1 ≤ 0.05mm;

[0011] Wherein, the thickness D1 of the insulating expansion body and the width D2 of the assembly gap satisfy the following condition: D1 < D2;

[0012] Furthermore, D2 satisfies: 0.3mm≤D1≤0.5mm.

[0013] Preferably, the relationship between the height H2 of the insulating expansion body and the height H1 of the mounting cavity satisfies: H1 = H2 + A; where A is 2.0 mm to 2.8 mm.

[0014] And / or, the relationship between the width L of the insulating expansion body and the radius d of the battery cell body satisfies: L=d*B; where B is 0.2~1.0.

[0015] Preferably, the insulating expansion body includes a straight section and a bent section connected to at least one end of the straight section; the straight section is connected to the inner wall of the bottom shell; the end of the bent section away from the straight section is bent toward one end face of the cell body.

[0016] Preferably, the cover plate has a central hole; the central hole extends through the thickness of the cover plate; and a third installation gap is provided between the side end of the bent section away from the straight section and the central hole.

[0017] Preferably, a second mounting gap is provided between the battery cell body and the cover plate, and between the battery cell body and the bottom of the bottom shell; and the relationship between the height M of the bending section and the height N of the second mounting gap satisfies: M = NC; where C is 0.2mm to 0.4mm;

[0018] Furthermore, the height M of the bending section satisfies: 4.0mm≤M≤4.5mm; and / or, the height N of the second installation gap satisfies: 4.3mm≤N≤4.8mm.

[0019] Preferably, a crease line is provided between the bent section and the straight section;

[0020] Furthermore, at least one notch is provided between the bent section and the straight section; the notch and the crease line are arranged in the same straight line direction.

[0021] This utility model also discloses an electrical device, including the battery structure described above.

[0022] The beneficial effects of this utility model are as follows: This technical solution replaces the conventional grooving process for the bottom shell by using an insulating expansion body assembled between the bottom shell and the cell body; thereby improving the space utilization rate inside the shell and reducing the number of processing steps; and by utilizing the expansion property of the insulating expansion body in contact with the electrolyte, the contact and fixation between the insulating expansion body and the cell body is achieved, thereby avoiding excessive shaking of the cell body; thus ensuring the assembly stability of the cell body, improving the compactness of the overall structure, and ensuring the width of the coating to increase ED (energy density). Attached Figure Description

[0023] The following will refer to the appendix. Figures 1-5 This section describes the features, advantages, and technical effects of exemplary embodiments of the present invention.

[0024] Figure 1 This is a schematic diagram of the battery structure according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the overall structure of the battery structure in the unfolded state of the insulating expansion body according to an embodiment of the present invention.

[0026] Figure 3 This is a partially enlarged view of the battery structure according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the unfolded state of the insulating expansion body of a battery structure according to an embodiment of the present invention;

[0028] Figure 5 This is a cross-sectional view of the insulating expansion body of a battery structure according to an embodiment of the present invention.

[0029] In the diagram: 1-Housing shell; 11-Bottom shell; 12-Cover plate; 121-Center hole; 101-Mounting cavity; 102-Assembly gap; 103-First mounting gap; 104-Second mounting gap; 2-Insulating expansion body; 21-Straight section; 22-Bending section; 23-Expansion adhesive layer; 24-Insulating layer; 201-Notch; 202-Fold line; 203-Mesh; 3-Cell body; 4-Third mounting gap. Detailed Implementation

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0031] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0032] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0033] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or multiple situations existing alone. In addition, the character " / " in this document generally indicates that the related objects before and after are in an "or" relationship.

[0034] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0035] The following is in conjunction with the appendix Figures 1-5 The present invention will be described in further detail, but this is not intended to limit the scope of the present invention.

[0036] like Figure 1 and 2 As shown, in one embodiment of this utility model, the battery structure includes a housing 1, an insulating expansion body 2, and a cell body 3. The housing 1 includes a bottom shell 11 and a cover plate 12 that are side by side and connected to each other. The bottom shell 11 and the cover plate 12 are connected to each other to jointly define an installation cavity 101. The cell body 3 is disposed inside the installation cavity 101, and an assembly gap 102 is provided between the cell body 3 and the bottom shell 11. The insulating expansion body 2 is connected to the inner wall of the bottom shell 11 and disposed inside the assembly gap 102. At least one end of the insulating expansion body 2 is bent toward the cell body 3.

[0037] The technical solution of this utility model replaces the conventional grooving process for the bottom shell by assembling an insulating expansion body between the bottom shell and the cell body. This improves the space utilization rate inside the shell and reduces the number of processing steps. Furthermore, the expansion property of the insulating expansion body in contact with the electrolyte ensures a fixed contact between the insulating expansion body and the cell body, thereby preventing excessive shaking of the cell body. This ensures the assembly stability of the cell body, improves the compactness of the overall structure, and also ensures the width of the coating, thus increasing the ED (energy density).

[0038] Specifically, a first installation gap 103 is provided between the insulating expansion body 2 and the battery cell body 3; this structure adds a first installation gap between the insulating expansion body and the battery cell body to ensure the smooth insertion of the battery cell body into the bottom shell and reduce the collision between the two and damage.

[0039] The battery cell body 3 includes a positive electrode, a separator, and a negative electrode arranged sequentially; the positive electrode, separator, and negative electrode are wound sequentially to form a wound body. Further, the positive electrode includes a positive current collector and a positive active material layer, the positive active material layer being coated on the surface of the positive current collector; the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material, such as lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector; the material of the negative current collector can be copper, and the negative active material layer includes a negative active material, such as carbon or silicon. The separator can be made of PP (polypropylene) or PE (polyethylene), etc.

[0040] The insulating expansion bodies 2 are at least two in number and are disposed in the circumferential direction of the cell body 3. Furthermore, the insulating expansion bodies 2 are two in number and symmetrically disposed on the inner walls of both sides of the bottom shell 11. This structure, by fixing and limiting the cell body 3 from both sides, prevents excessive shaking of the cell body; thereby ensuring the assembly stability of the cell body, improving the overall structural compactness, and ensuring the width of the coating to increase ED (energy density).

[0041] Specifically, in some implementations, such as Figure 1 , 2As shown in Figure 4, the insulating expansion body 2 is provided with at least one mesh 203; the mesh 203 is arranged through the thickness direction of the insulating expansion body 2. That is to say, the flow performance of the mesh 203 increases the contact area of ​​the electrolyte, which is beneficial to promoting the expansion direction and stability of the insulating expansion body 2, avoiding damage to the insulating expansion body 2 itself; and can also ensure the stability and safety of the battery cell body 3 in use.

[0042] Specifically, in some implementations, such as Figure 1 , 2 As shown in Figures 4 and 5, the insulating expansion body 2 includes an expanded adhesive layer 23 and an insulating layer 24 stacked together; the expanded adhesive layer 23 is connected to the bottom shell 11; the insulating layer 24 abuts against the side surface of the battery cell body 3. In some embodiments, the insulating layer 24 is made of PET (Polyethylene terephthalate) or PBT (Polybutylene terephthalate); the expanded adhesive layer 23 is made of acrylate polymer or polyacrylate-based gel polymer. That is, after the insulating expansion body 2 is assembled to the inner wall of the bottom shell 11, the adhesive layer expands after being immersed in the electrolyte, causing the insulating layer 24 to expand to the outer surface of the battery cell body 3, thus fixing the battery cell body.

[0043] Specifically, in some implementations, such as Figure 3 and 5 As shown, the thickness D1 of the insulating expansion body 2 (intermediate expansion adhesive layer 23 and insulating layer 24) satisfies: 0.03mm ≤ D1 ≤ 0.05mm; the thickness D1 of the insulating expansion body 2 (intermediate expansion adhesive layer 23 and insulating layer 24) is less than the width D2 of the assembly gap 102; and D2 satisfies: 0.3mm ≤ D1 ≤ 0.5mm. That is, by assembling the insulating expansion body 2 with a 10% width D2 of the assembly gap 102, the smoothness of the battery cell body 3's assembly into the casing is facilitated; and the insulating expansion body 2 expands to the outer surface of the battery cell body 3, thus fixing the battery cell body.

[0044] Specifically, in some implementations, such as Figure 1 and 2 As shown, the relationship between the height H2 of the insulating expansion body 2 and the height H1 of the mounting cavity 101 satisfies: H1 = H2 + A; where A is 2.0 mm to 2.8 mm; preferably, H1 = H2 + 2.4. That is, the two ends of the insulating expansion body 2 in the height direction are slightly lower than the two ends of the housing 1 in the height direction, and each end is 1.2 mm lower; this is beneficial to improving the compactness of the overall structure and ensuring the design of the dressing width; thereby improving ED (energy density).

[0045] Specifically, in some implementations, such as Figure 1 , 2 As shown in Figure 4, the insulating expansion body 2 includes a straight section 21 and a bent section 22 connected to at least one end of the straight section 21; the straight section 21 is connected to the inner wall of the bottom shell 11; the bent section 22 is bent towards the side face of the cell body 3 at the end away from the straight section 21. Wherein, as... Figure 4 As shown, there are two bending sections 22, symmetrically arranged on both sides of the straight section 21. That is, the bending sections 22 at both ends assemble the upper and lower sides of the battery cell body 3, thereby providing upper and lower support and limiting for the battery cell body 3, which helps improve its installation stability. Furthermore, mesh 203 is distributed on the straight section 21 and the two bending sections 22, further promoting the contact support performance between the insulating expansion body 2 and the battery cell body 3, thus ensuring the stability and safety of the battery cell body 3 in use. Furthermore, the straight section 21 and the two bending sections 22 are each provided with an expansion adhesive layer 23 and an insulating layer 24 to ensure stability with the bottom shell 11 and to ensure the fixation of the battery cell body 3. Furthermore, the edges of the straight section 21 and each bending section 22 are provided with smooth edges; that is, the edges of the straight section 21 and each bending section 22 are free of burrs, thereby improving safety in use.

[0046] Specifically, in some implementations, such as Figure 1 and 2 As shown, the cover plate 12 has a central hole 121; the central hole 121 extends through the thickness of the cover plate 12; and a third installation gap 4 is provided between the side end of the bent section 22 away from the straight section 21 and the central hole 121. That is to say, the bent section 22 does not cover the central hole 121 after bending, which is conducive to the realization of the seepage effect after liquid injection.

[0047] Specifically, in some implementations, such as Figure 2 and 3 As shown, a second mounting gap 104 is provided between the battery cell body 3 and the cover plate 12, and between the battery cell body 3 and the bottom of the bottom shell 11. The relationship between the height M of the bent section 22 and the height N of the second mounting gap 104 satisfies: M = NC; where C is 0.2mm to 0.4mm; preferably M = N - 0.3mm; and the height M of the bent section 22 satisfies: 4.0mm ≤ M ≤ 4.5mm; the height N of the second mounting gap 104 satisfies: 4.3mm ≤ N ≤ 4.8mm. In other words, by reserving a 0.3mm distance for storing the folded bent section 22, the stability and smoothness of assembly are improved.

[0048] Specifically, in some implementations, such as Figure 4 and 5As shown, a crease line 202 is provided between the bent section 22 and the straight section 21; and at least one notch 201 is also provided between the bent section 22 and the straight section 21; the notch 201 and the crease line 202 are arranged in the same straight line direction. That is, the notch 201 is provided on at least one side of the crease line 202. There are two notches 201, located on both sides of the crease line 202. This structure improves the ease of bending operations by combining the flexibility of the crease line 202 with the notch 201, and also ensures the stability of its overall structure.

[0049] Specifically, in some implementations, such as Figure 2 and 4 As shown, the relationship between the width L of the insulating expansion body 2 and the radius d of the cell body 3 satisfies: L=d*B; where B is 0.2~1.0. This structure ensures a sufficient coverage area for contact fixation between the insulating expansion body 2 and the cell body 3 through a suitable width, thereby improving the fixation performance between the cell body 3 and the cell body 3.

[0050] This utility model also proposes an electrical device, which includes a battery structure. The specific structure of the battery structure is as described in the above embodiments. Since this electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0051] The electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose special limitations on the above-mentioned electrical equipment.

[0052] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0053] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on this utility model are within the protection scope of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A battery structure, characterized in that: The device includes a housing, an insulating expansion body, and a battery cell body. The housing includes a bottom shell and a cover plate. The bottom shell and the cover plate are connected to each other to define an installation cavity. The battery cell body is disposed inside the installation cavity, and an assembly gap is provided between the battery cell body and the bottom shell. The insulating expansion body is connected to the inner wall of the bottom shell and disposed inside the assembly gap. At least one end of the insulating expansion body is bent toward the battery cell body.

2. The battery structure according to claim 1, characterized in that: A first installation gap is provided between the insulating expansion body and the battery cell body; And / or, the insulating expansion body is provided with at least one mesh; the mesh is arranged through the thickness direction of the insulating expansion body.

3. The battery structure according to claim 1, characterized in that: The insulating expansion body includes an expansion adhesive layer and an insulating layer stacked together; the expansion adhesive layer is connected to the bottom shell; the insulating layer abuts against the side surface of the battery cell body.

4. The battery structure according to claim 1 or 3, characterized in that: The thickness D1 of the insulating expansion body satisfies: 0.03mm ≤ D1 ≤ 0.05mm; Wherein, the thickness D1 of the insulating expansion body and the width D2 of the assembly gap satisfy the following condition: D1 < D2; Furthermore, D2 satisfies: 0.3mm≤D1≤0.5mm.

5. The battery structure according to claim 1 or 3, characterized in that: The relationship between the height H2 of the insulating expansion body and the height H1 of the mounting cavity satisfies: H1 = H2 + A; where A is 2.0 mm to 2.8 mm. And / or, the relationship between the width L of the insulating expansion body and the radius d of the battery cell body satisfies: L=d*B; where B is 0.2~1.

0.

6. The battery structure according to claim 1, 2, or 3, characterized in that: The insulating expansion body includes a straight section and a bent section connected to at least one end of the straight section; the straight section is connected to the inner wall of the bottom shell; the end of the bent section away from the straight section is bent toward one end face of the cell body.

7. The battery structure according to claim 6, characterized in that: The cover plate has a central hole; the central hole extends through the thickness of the cover plate; and a third installation gap is provided between the side end of the bent section away from the straight section and the central hole.

8. The battery structure according to claim 6, characterized in that: A second mounting gap is provided between the battery cell body and the cover plate, and between the battery cell body and the bottom of the bottom shell; and the relationship between the height M of the bending section and the height N of the second mounting gap satisfies: M = NC; where C is 0.2mm to 0.4mm; Furthermore, the height M of the bending section satisfies: 4.0mm≤M≤4.5mm; and / or, the height N of the second installation gap satisfies: 4.3mm≤N≤4.8mm.

9. The battery structure according to claim 6, characterized in that: A crease line is provided between the bent section and the straight section; Furthermore, at least one notch is provided between the bent section and the straight section; the notch and the crease line are arranged in the same straight line direction.

10. An electrical appliance, characterized in that: Includes the battery structure described in any one of claims 1 to 9.

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