Battery pack for improving group margin
By setting an adjustable inner clamping plate inside the battery pack housing to clamp the cells, the problem of insufficient margin of the internal cell group of lithium batteries is solved, the battery performance consistency and cycle capability are improved, and the testing process is simplified.
Patent Information
- Application Number
- CN202423108136.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2034-12-16
AI Technical Summary
Insufficient margin in the internal cell group of lithium batteries leads to inconsistent battery cycle performance and poor cycle capacity. The hot pressing and shaping process affects the consistency of the cells.
First and second inner clamping plates are provided inside the battery pack housing, and the inner clamping plates are driven to move along a first direction by an adjusting component to clamp the battery cells, thereby improving the tightness and expansion issues of the battery cells.
It improves the internal group margin of the battery, enhances the consistency of cell performance and cycle capability, and simplifies the testing process, thereby increasing the efficiency of rack testing.
Smart Images
Figure CN223871590U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a battery pack with improved group margin. Background Technology
[0002] Currently, insufficient cell margin within lithium-ion batteries is a major issue affecting battery cycle life, easily leading to rapid battery cycle drops and significant short-term performance differences between battery groups. Furthermore, the hot-pressing and shaping process, a crucial step in lithium-ion battery manufacturing, is used to connect multiple locations, including aluminum / copper current collectors, electrodes, and battery packaging. Any deformation, such as cell softening, cell deformation, cell expansion, or low cell tightness, will significantly impact the cell margin within the lithium-ion battery, thereby affecting the consistency of battery performance. Utility Model Content
[0003] The purpose of this invention is to address the problems of inconsistent cell performance and poor cycle life in the prior art by improving the insufficient internal group margin of the battery.
[0004] To address the aforementioned technical problems, this utility model provides a battery pack with improved group margin, which has a first direction and includes a housing. Inside the housing is a cell module consisting of multiple cells stacked in the first direction. The cell module has a first inner clamping plate and a second inner clamping plate at both ends along the first direction. The housing has a first adjustment component and a second adjustment component at both ends along the first direction.
[0005] The first adjustment component is connected to the first inner clamping plate and can drive the first inner clamping plate to move along the first direction; the second adjustment component is connected to the second inner clamping plate and can drive the second inner clamping plate to move along the first direction.
[0006] More preferably, both the first inner clamping plate and the second inner clamping plate are corrosion-resistant plastic inner clamping plates.
[0007] More preferably, the corrosion-resistant plastic inner lining is a polypropylene inner lining.
[0008] More preferably, the thickness of the first inner clamping plate and the second inner clamping plate is 1±0.2mm.
[0009] More preferably, the strength of the first inner clamping plate and the second inner clamping plate is greater than or equal to 20 MPa.
[0010] More preferably, the large surface of the battery cell is located at both ends in the first direction, and the first inner clamping plate and the second inner clamping plate respectively abut against the large surface at both ends of the battery cell, and the area of the first inner clamping plate and the second inner clamping plate is equal to the area of the large surface of the battery cell.
[0011] More preferably, the first adjusting component includes a first screw and a first nut, the first nut being rotatably connected to the housing, the first screw being threadedly connected to the first nut to form a self-sealing thread, and one end of the first screw being connected to the first inner clamping plate.
[0012] More preferably, the second adjusting component includes a second screw and a second nut, the second nut being rotatably connected to the housing, the second screw being threadedly connected to the second nut to form a self-sealing thread, and one end of the second screw being connected to the second inner clamping plate.
[0013] Compared with the prior art, the battery pack with improved group margin provided by this utility model has the following advantages:
[0014] This invention, by setting a first inner clamping plate and a second inner clamping plate inside the casing, and enabling them to move in a first direction through the first adjustment component and the second adjustment component respectively, can clamp the stacked battery cells. This can improve the defects of insufficient battery margin caused by internal softening, expansion, and low tightness. It also solves the problems of inconsistent cell performance and poor cycle capability in the prior art. At the same time, the clamping plate process can be eliminated when testing cycle performance, thus improving the efficiency of rack testing. Attached Figure Description
[0015] Figure 1 This is a structural diagram of a battery pack with improved group margin as described in this utility model.
[0016] Reference numerals: 10, housing; 20, battery cell module; 30, first inner clamping plate; 40, second inner clamping plate; 50, first adjustment component; 60, second adjustment component; X, first direction. Detailed Implementation
[0017] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.
[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.
[0019] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0020] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0022] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0023] like Figure 1As shown, this embodiment provides a battery pack with improved group margin, which has a first direction X and includes a housing 10. Inside the housing 10 is a cell module 20 composed of multiple cells stacked in the first direction X. The cell module 20 has a first inner clamping plate 30 and a second inner clamping plate 40 at both ends along the first direction X. The housing 10 has a first adjustment component 50 and a second adjustment component 60 at both ends along the first direction X. The first adjustment component 50 is connected to the first inner clamping plate 30 and can drive the first inner clamping plate 30 to move along the first direction X. The second adjustment component 60 is connected to the second inner clamping plate 40 and can drive the second inner clamping plate 40 to move along the first direction X. Therefore, by setting a first inner clamping plate 30 and a second inner clamping plate 40 inside the housing 10, and by realizing movement in the first direction X through the first adjustment component 50 and the second adjustment component 60 respectively, the stacked cells can be clamped, which can improve the defects of insufficient cell margin caused by softness, expansion and low tightness inside the battery, and solve the problems of inconsistent cell performance and poor cycle capability in the prior art. At the same time, the clamping plate process can be eliminated when testing cycle performance, thus improving the efficiency of rack testing.
[0024] In some embodiments, the first inner plate 30 and the second inner plate 40 are both corrosion-resistant plastic inner plates. The corrosion-resistant plastic inner plates have good corrosion resistance and insulation properties, which can prevent them from affecting the battery cell.
[0025] In some embodiments, the corrosion-resistant plastic inner clamp is a polypropylene inner clamp. The use of a polypropylene inner clamp ensures that the inner clamp has good corrosion resistance and heat resistance. In addition, the polypropylene inner clamp has high strength and can provide strong support, so that the battery cell can be clamped by the first inner clamp 30 and the second inner clamp 40.
[0026] In some embodiments, the thickness of the first inner clamping plate 30 and the second inner clamping plate 40 is 1 ± 0.2 mm to reduce the overall weight of the battery pack.
[0027] In some embodiments, the strength of the first inner clamping plate 30 and the second inner clamping plate 40 is greater than or equal to 20 MPa. The strength of the inner clamping plate is greater than or equal to 20 MPa, which can ensure that the inner clamping plate effectively clamps the battery cell, so as to avoid the inner clamping plate breaking when the battery cell expands.
[0028] In some embodiments, the large surface of the battery cell is placed at both ends in the first direction X, and the first inner clamping plate 30 and the second inner clamping plate 40 respectively abut against the large surface at both ends of the battery cell. The area of the first inner clamping plate 30 and the second inner clamping plate 40 is equal to the area of the large surface of the battery cell, so as to ensure effective clamping of the battery cell. At the same time, it can also ensure that there is enough space inside the housing 10 to install the inner clamping plate.
[0029] In some embodiments, the first adjusting assembly 50 includes a first screw and a first nut. The first nut is rotatably connected to the housing 10, and the first screw is threadedly connected to the first nut to form a self-sealing thread. One end of the first screw is connected to the first inner clamping plate 30. Similarly, the second adjusting assembly 60 includes a second screw and a second nut. The second nut is rotatably connected to the housing 10, and the second screw is threadedly connected to the second nut to form a self-sealing thread. One end of the second screw is connected to the second inner clamping plate 40. Thus, by using the nut and screw, the tightness inside the battery cell can be manually adjusted, thereby improving the internal battery margin.
[0030] In summary, this utility model provides a battery pack with improved cell margin. By providing a first inner clamping plate 30 and a second inner clamping plate 40 within the housing 10, and enabling movement in the first direction X via the first adjustment component 50 and the second adjustment component 60 respectively, the stacked cells can be clamped. This improves the defects of insufficient cell margin caused by internal softening, expansion, and low tightness of the battery. It also solves the problems of inconsistent cell performance and poor cycle capability in the prior art. At the same time, the clamping plate process can be eliminated during cycle performance testing, improving the efficiency of rack testing.
[0031] The above description is merely a preferred embodiment of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model. The basic principles, main features, and advantages of this utility model have been shown and described above. For those skilled in the art, it is obvious that this utility model is not limited to the details of the above preferred embodiments. The embodiments should be considered exemplary and non-limiting. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included within this utility model.
[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A battery pack with improved group margin, having a first orientation, characterized in that, Includes a housing, the interior of which is provided a battery cell module consisting of multiple battery cells stacked in the first direction; The battery cell module is provided with a first inner clamping plate and a second inner clamping plate at both ends along the first direction; the housing is provided with a first adjustment component and a second adjustment component at both ends along the first direction. The first adjustment component is connected to the first inner clamping plate and can drive the first inner clamping plate to move along the first direction; the second adjustment component is connected to the second inner clamping plate and can drive the second inner clamping plate to move along the first direction.
2. The battery pack with improved group margin according to claim 1, characterized in that, Both the first inner clamping plate and the second inner clamping plate are corrosion-resistant plastic inner clamping plates.
3. A battery pack with improved group margin according to claim 2, characterized in that, The corrosion-resistant plastic inner lining is a polypropylene inner lining.
4. A battery pack with improved group margin according to claim 1, characterized in that, The thickness of the first inner clamping plate and the second inner clamping plate is 1±0.2mm.
5. A battery pack with improved group margin according to claim 1, characterized in that, The strength of the first inner clamping plate and the second inner clamping plate is greater than or equal to 20 MPa.
6. A battery pack with improved group margin according to claim 1, characterized in that, The large surface of the battery cell is located at both ends in the first direction, and the first inner clamping plate and the second inner clamping plate respectively abut against the large surface at both ends of the battery cell, and the area of the first inner clamping plate and the second inner clamping plate is equal to the area of the large surface of the battery cell.
7. A battery pack with improved group margin according to claim 1, characterized in that, The first adjustment assembly includes a first screw and a first nut. The first nut is rotatably connected to the housing. The first screw and the first nut are threadedly connected to form a self-sealing thread. One end of the first screw is connected to the first inner clamping plate.
8. A battery pack with improved group margin according to claim 1, characterized in that, The second adjusting assembly includes a second screw and a second nut, the second nut being attached to the housing. The body is rotatably connected, and the second screw and the second nut are threadedly connected to form a self-sealing thread. One end of the second screw is connected to the second inner clamping plate.