Secondary battery
By setting up an elastic bracket inside the secondary battery, the problem of poor electrolyte infiltration caused by cell expansion is solved, and the service life of the battery is improved.
Patent Information
- Application Number
- CN202422242078.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-09-12
AI Technical Summary
During the long-term use of existing secondary batteries, the positive and negative electrode sheets inside the battery cell are squeezed, resulting in poor electrolyte infiltration effect and affecting the performance of the battery cell.
A bracket with an elastic section is arranged inside the secondary battery, and the expansion of the battery cell is absorbed by the tensile action of the elastic section, providing elastic restraint, and ensuring the wetting effect of the electrode in the electrolyte.
The service life of the secondary battery is improved, and the expansion of the battery cell is absorbed through the elastic bracket to ensure the wetting effect of the electrode in the electrolyte and prevent the electrode from being squeezed.
Smart Images
Figure CN223309123U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a secondary battery. Background Art
[0002] Secondary batteries have the advantages of stable voltage, safety and reliability, low price, and abundant raw materials. They mainly include lithium-ion batteries, sodium-ion batteries, lithium-sulfur batteries, etc.
[0003] Currently, the commonly used square soft-pack batteries with aluminum or other metal shells or aluminum-plastic film shells generally consist of bare cells, electrolyte, and an outer aluminum shell or aluminum-plastic film. Bare cells are generally composed of one or more wound or laminated bare cells, which are combined with an empty aluminum shell or aluminum-plastic film with holes punched in. The electrolyte is then injected into the shell through the injection holes on the cover or the aluminum-plastic film to form the final battery cell. During use, to ensure better wettability between the electrodes and the electrolyte and thus ensure cycle performance, they are restrained with a clamp with a certain preload, steel strips, or sheet metal plates before use.
[0004] However, as the battery cell is used for a long time, the battery cell itself expands due to the chemical changes occurring inside it. Due to the constraints of its inherent size, the restraint force on the battery cell gradually increases, causing the positive and negative electrodes inside the battery cell to be squeezed, resulting in an adverse effect on the electrolyte infiltration, resulting in black spots and other phenomena that have an adverse effect on the performance of the battery cell and may even make it unusable. Utility Model Content
[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the positive and negative electrodes of the secondary battery cells are squeezed after long-term use, resulting in adverse effects on the electrolyte infiltration, thereby providing a secondary battery.
[0006] In order to solve the above technical problems, the present invention provides a secondary battery, comprising:
[0007] a housing having an electrolyte disposed therein;
[0008] a bare battery cell, disposed in the housing and immersed in the electrolyte;
[0009] The bracket has a restraining fence arranged circumferentially around the outer side wall of the bare battery cell, the restraining fence has at least two symmetrically arranged cross bars, and the two cross bars have at least partial sections that are elastic sections. When the bare battery cell expands, the elastic sections are stretched to elastically restrain the circumference of the bare battery cell.
[0010] Optionally, the restraint fence has at least two groups spaced apart in an upper and lower direction, and a restraint plate is connected between the two groups of restraint fences, and the restraint plate covers part of the outer side wall of the bare battery cell.
[0011] Optionally, the constraint plates include at least two plates symmetrically arranged relative to the bare battery core.
[0012] Optionally, each group of the restraint fences has four horizontal bars, and the four horizontal bars are connected in sequence to form a rectangular frame. The four corner positions between the upper and lower groups of the restraint fences are connected by vertical bars to form a rectangular frame.
[0013] Optionally, each of the cross bars has an elastic section and an inelastic section, and the elastic section and the inelastic section are connected by a sleeve.
[0014] Optionally, the sleeve is a heat shrink tube.
[0015] Optionally, each crossbar connected to the constraint plate has at least two elastic sections symmetrically arranged relative to the constraint plate.
[0016] Optionally, the constraint plate is a rectangular plate or a circular plate.
[0017] Optionally, the width of the constraint plate is t1, the width of the large surface of the bare cell is t2, the height of the bare cell is h2, and 4 / 5*h2≥t1≥1 / 3*t2.
[0018] Optionally, the height of the bracket is h1, and h1≥1 / 3*h2.
[0019] The technical solution of this utility model has the following advantages:
[0020] The secondary battery provided by the utility model provides a bracket with an elastic section inside the secondary battery, thereby generating elastic constraints on the bare battery cells of the secondary battery, and utilizing the stretching effect of the elastic section to absorb the expansion generated during use of the secondary battery, thereby ensuring the infiltration effect of the electrodes in the bare battery cells in the electrolyte. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0022] Figure 1 A front view of a specific implementation of a secondary battery provided in an embodiment of the present utility model;
[0023] Figure 2 for Figure 1 A three-dimensional view of the middle bracket;
[0024] Figure 3 A side view of a specific implementation of a secondary battery provided in an embodiment of the present utility model;
[0025] Figure 4 This is a front view of another specific implementation of the secondary battery provided in an embodiment of the present utility model.
[0026] Description of reference numerals:
[0027] 1. Casing; 2. Electrolyte; 3. Battery cell; 4. Bracket; 5. Constraint fence; 6. Constraint plate; 7. Vertical rod; 8. Casing; 9. Non-elastic section; 10. First elastic section; 11. Second elastic section; 12. Long cross bar; 13. Short cross bar. DETAILED DESCRIPTION
[0028] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.
[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or 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 devices or components 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, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0030] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.
[0031] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0032] like Figure 1 The figure shows a specific embodiment of the secondary battery provided in this embodiment, comprising: a housing 1, a bare cell 3, and a support 4. The housing 1 contains an electrolyte 2; the bare cell 3 is disposed within the housing 1 and immersed in the electrolyte 2; the support 4 comprises a circumferentially arranged restraining fence surrounding the outer wall of the bare cell 3. The support 4 is entirely made of insulating material and comprises at least two symmetrically arranged crossbars, each of which has at least a portion of an elastic section. When the bare cell 3 expands, the elastic section is stretched to elastically restrain the bare cell 3 circumferentially.
[0033] like Figure 1 、 Figure 2 As shown, the secondary battery provided in this embodiment generates elastic constraints on the bare cells 3 of the secondary battery by arranging a bracket 4 with an elastic segment inside the secondary battery, and utilizes the stretching effect of the elastic segment to absorb the expansion generated during the use of the secondary battery, thereby ensuring the wetting effect of the electrodes in the bare cells 3 in the electrolyte 2, and can improve the service life of the secondary battery compared to the existing technology.
[0034] like Figure 1 As shown, the secondary battery provided in this embodiment has two groups of constraint fences 5 spaced apart from each other, and a constraint plate 6 is connected between the two groups of constraint fences 5. The constraint plate 6 covers part of the outer wall of the large surface of the bare cell 3. With such a configuration, the bracket 4 can be wrapped around the outside of the bare cell 3 by the combination of the constraint fence 5 and the constraint plate 6. The expansion generated at the large surface is relatively large, and the constraint plate 6 can fully absorb the expansion generated at the large surfaces of the bare cell 3 on both sides. Of course, the above description is not restrictive. In some alternative embodiments, the constraint plate 6 can be omitted when the secondary battery is smaller. The constraint body can also have more groups spaced apart from each other, or it can be a whole.
[0035] like Figure 2 As shown, in the secondary battery provided in this embodiment, the restraining plates 6 comprise two symmetrically arranged plates relative to the bare cells 3. This arrangement ensures the symmetry of the bracket 4 and ensures that the different electrodes of the secondary battery have the same wettability in the electrolyte 2. Of course, the above description is not restrictive; in alternative embodiments, the restraining plates 6 may comprise more symmetrically arranged plates, or may comprise only one plate.
[0036] like Figure 2As shown, in the secondary battery provided by this embodiment, each group of the constraint fence 5 has four cross bars, and the four cross bars are connected in sequence to form a rectangular frame; specifically, the four cross bars include: two symmetrically arranged long cross bars 12 and two symmetrically arranged short cross bars 13; wherein, the constraint plate 6 is arranged between the two long cross bars 12 spaced apart in the upper and lower parts of the two groups of the constraint fences 5. The four corner positions between the upper and lower groups of the constraint fences 5 are connected by vertical bars 7, respectively, to form a rectangular frame. Specifically, in this embodiment, the frame thickness of the rectangular frame is greater than 5 mm, and the entire bracket 4 not only plays the role of a binding force of an ordinary clamp on the battery cell, but also can ensure sufficient infiltration of the electrode sheet and the electrolyte 2. Of course, the above description is not restrictive. In some alternative embodiments, the constraint fence 5 can also be other structures, such as a circle; in some alternative embodiments, the vertical bar 7 can also be omitted.
[0037] like Figure 1 As shown, the secondary battery provided in this embodiment has an elastic section and a non-elastic section 9 on each of the cross bars. Specifically, the long cross bar 12 is provided with a first elastic section 10 at both ends of the constraint plate 6, and the short cross bar 13 is provided with a second elastic section 11 in the middle section. The four corners of the constraint fence 5 are non-elastic sections. The non-elastic section 9 is made of PC material (polycarbonate) and has a certain support. The elastic section and the non-elastic section 9 are connected by a sleeve 8. The elastic section can make the bracket 4 as a whole elastic, and the non-elastic section 9 can make the bracket 4 as a whole constrained to the bare battery cell 3. Of course, the above description is not restrictive. In some alternative embodiments, the cross bar may have a part without an elastic section or without a non-elastic section 9. The elastic section and the non-elastic section 9 can also be connected by other means, such as gluing.
[0038] like Figure 1 、 Figure 3 As shown, in the secondary battery provided in this embodiment, the sleeve 8 is a heat shrink tube. Specifically, the heat shrink tube material can be polyolefin. The heat shrink tube has the functions of high-temperature shrinkage, flexibility, flame retardancy, insulation and corrosion resistance. Such a configuration can ensure the safety of the bracket 4 in the electrolyte 2. Of course, the above description is not restrictive. In some alternative embodiments, the sleeve 8 can also be made of other materials, such as a PVC hose or a rigid tube, and then the elastic section and the non-elastic section 9 can be connected using fasteners.
[0039] like Figure 2As shown, in the secondary battery provided in this embodiment, each long crossbar 12 connected to the restraining plate 6 has at least two first elastic segments 10 symmetrically arranged relative to the restraining plate 6. This arrangement ensures that the bracket 4 has the same elasticity in the left and right directions, and more evenly applies the expansion of the bare battery cell 3 to the bracket 4. Of course, the above description is not restrictive, and in some alternative embodiments, the first elastic segments 10 can also be asymmetrical.
[0040] like Figure 4 As shown, in the secondary battery provided in this embodiment, the constraint plate 6 is a rectangular plate or a circular plate. This configuration allows the shape of the constraint plate 6 to be reasonably adjusted according to the size of the secondary battery. Of course, the above description is not restrictive. In some alternative embodiments, the shape of the constraint plate 6 can also be annular.
[0041] like Figure 1 As shown, in the secondary battery provided in this embodiment, the width of the constraint plate 6 is t1, the width of the large surface of the bare cell 3 is t2, the height of the bare cell 3 is h2, and 4 / 5*h2≥t1≥1 / 3*t2. The height of the bracket 4 is h1, and h1≥1 / 3*h2. This arrangement can ensure that the bracket 4 can cover more effective areas of the bare cell 3, ensuring the effectiveness of the bracket 4. Of course, the above description is not restrictive. In some alternative embodiments, the height of the bracket 4 can also be the same as the height of the bare cell 3.
[0042] Working principle:
[0043] Inside the secondary battery, a bracket 4 having an elastic section and a non-elastic section 9 is circumferentially arranged on the outer side of the bare cell 3. When the cell expands due to chemical changes occurring inside the secondary battery during use, the outer bracket 4 can absorb the expansion of the cell through the stretching action of the elastic section, thereby preventing the internal electrodes of the cell from being squeezed, ensuring that the electrodes can always be immersed in the electrolyte 2, and increasing the service life of the secondary battery.
[0044] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.
Claims
1. A secondary battery, characterized in that: include: A housing (1) containing an electrolyte (2); A bare battery core (3) is disposed in the housing (1) and immersed in the electrolyte (2); The bracket (4) has a restraining fence (5) arranged circumferentially around the outer side wall of the bare battery core (3), the restraining fence (5) having at least two symmetrically arranged cross bars, at least part of each of the two cross bars being an elastic section, and when the bare battery core (3) expands, the elastic section is stretched to elastically restrain the bare battery core (3) circumferentially.
2. The secondary battery according to claim 1, wherein The restraining fences (5) have at least two groups spaced apart from each other, and a restraining plate (6) is connected between the two groups of restraining fences (5), and the restraining plate (6) covers part of the outer side wall of the bare battery core (3).
3. The secondary battery according to claim 2, wherein The constraint plates (6) include at least two plates symmetrically arranged relative to the bare battery core (3).
4. The secondary battery according to claim 2, wherein: Each group of the restraining fences (5) has four cross bars, which are sequentially connected to form a rectangular frame. The four corner positions between the upper and lower groups of the restraining fences (5) are respectively connected by vertical bars (7) to form a rectangular parallelepiped frame.
5. The secondary battery according to claim 4, wherein Each crossbar has an elastic section and a non-elastic section (9), and the elastic section and the non-elastic section (9) are connected via a sleeve (8).
6. The secondary battery according to claim 5, characterized in that The sleeve (8) is a heat shrink tube.
7. The secondary battery according to claim 5, characterized in that Each crossbar connected to the constraint plate (6) has at least two elastic sections symmetrically arranged relative to the constraint plate (6).
8. The secondary battery according to any one of claims 2 to 6, characterized in that: The restraining plate (6) is a rectangular plate or a circular plate.
9. The secondary battery according to any one of claims 2 to 6, characterized in that: The width of the constraint plate (6) is t1, the width of the large surface of the bare battery core (3) is t2, the height of the bare battery core (3) is h2, and 4 / 5*h2≥t1≥1 / 3*t2.
10. The secondary battery according to claim 8, wherein The height of the bracket (4) is h1, and h1≥1 / 3*h2.