Battery and battery system
By introducing a combination of piezoelectric modules and capacitors into the battery, the synchronous regulation of battery volume changes is achieved, solving the problems of performance degradation and safety hazards caused by volume changes during charging and discharging, improving the battery's cycle stability and safety, and enhancing energy efficiency through energy recovery.
Patent Information
- Application Number
- CN202422998958.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-05
AI Technical Summary
Existing batteries cannot precisely and synchronously regulate volume changes during charging and discharging, leading to performance degradation, poor cycle stability, and even safety hazards. In particular, excessive volume changes in high-power-density battery systems may cause mechanical stress, shorten battery life, or lead to safety accidents.
By combining a piezoelectric module with a capacitor, the piezoelectric unit is connected to the capacitor to synchronously regulate the battery volume change using the piezoelectric effect. Power recovery is achieved through an energy sensor, and the battery volume change is precisely regulated by the acquisition and control module.
It achieves synchronous regulation of battery volume changes, improves battery cycle life and safety, and prevents safety issues such as battery thermal runaway and short circuits caused by electrode damage and excessive changes in cell volume, thereby enhancing battery safety and improving energy efficiency through energy recovery.
Smart Images
Figure CN223651500U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a battery and a battery system. Background Technology
[0002] During charging and discharging, a battery's volume expands or contracts significantly with changes in its state of charge (SOC). Current battery technologies cannot precisely synchronize these volume changes, leading to performance degradation, poor cycle stability, and potentially safety hazards. Especially in high-power-density battery systems, excessive volume changes can exert mechanical stress on electrode materials, shortening battery life or causing safety incidents. Therefore, precisely regulating battery volume changes during charging and discharging remains a significant technological challenge. Utility Model Content
[0003] This invention provides a battery and battery system that can reduce the impact of battery volume expansion on the electrodes and effectively prevent safety problems such as battery thermal runaway and short circuits caused by excessive changes in cell volume.
[0004] In a first aspect, the present invention provides a battery, comprising: a battery cell, a piezoelectric module, and a housing; the housing contains the battery cell and the piezoelectric module; the piezoelectric module is located on one side of the battery cell and is in contact with the battery cell; the thickness change direction of the piezoelectric module is the same as the volume change direction of the battery cell; the piezoelectric module includes a piezoelectric unit and a capacitor; the piezoelectric unit is connected to the capacitor.
[0005] Preferably, the piezoelectric unit is connected to the capacitor by a wire; the wire is a copper wire, an aluminum wire, an aluminum alloy wire, or a silver-plated copper wire.
[0006] Preferably, the two ends of the capacitor are respectively connected to the two ends of the piezoelectric unit along the thickness change direction; when the volume of the battery cell expands, it squeezes the piezoelectric unit to generate charge, and the capacitor is charged; when the volume of the battery cell contracts, the capacitor is discharged.
[0007] Preferably, the capacitor has an operating voltage of 0–10V and a capacitance of 100–1000μF.
[0008] Preferably, the piezoelectric unit is a thin film made of lead zirconate titanate, polyvinylidene fluoride, or lithium niobate.
[0009] Preferably, the housing is a rigid housing.
[0010] Preferably, the thickness of the piezoelectric unit is 0.55 to 1 mm.
[0011] Preferably, when the battery cell is a laminated battery cell, the piezoelectric unit is placed side by side with the laminated battery cell, and the contact area between the piezoelectric unit and the laminated battery cell is the area of the piezoelectric unit.
[0012] Preferably, when the battery cell is a wound battery cell, the piezoelectric unit is wrapped around the outer surface of the wound battery cell, and the contact area between the piezoelectric unit and the wound battery cell is the area of the piezoelectric unit, and the housing is wrapped around the outside of the piezoelectric unit.
[0013] Secondly, this utility model also provides a battery system, comprising: the battery described in the first aspect above, a data acquisition module, and a control module; the data acquisition module and the control module are respectively connected to the battery; the data acquisition module and the control module are connected.
[0014] The acquisition module is used to acquire the thickness change of the battery cell in the battery and send it to the control module;
[0015] The control module is used to receive the thickness change of the battery cell and adjust the voltage value of the capacitor in the battery so that the thickness change of the piezoelectric unit is the same as the thickness change of the battery cell.
[0016] Compared with the prior art, the present invention has at least the following advantages:
[0017] This invention provides a battery that, by synchronously regulating battery volume changes, avoids electrode damage caused by excessive expansion or contraction, thereby improving the battery's cycle life and cycle stability. Simultaneously, it effectively prevents safety issues such as thermal runaway and short circuits caused by excessive cell volume changes, enhancing battery safety. Furthermore, during battery charging and discharging, the piezoelectric unit can recover the mechanical energy generated by cell volume changes and convert it into electrical energy for the capacitor, thus improving energy efficiency through energy recovery.
[0018] The present invention provides a battery system that, by collecting the thickness change of the battery cell, can accurately obtain the voltage value of the capacitor when the thickness change of the piezoelectric unit is the same as the thickness change of the battery cell, thereby achieving synchronous adjustment of the battery volume change and further improving the battery safety. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a side view of a structural schematic diagram of a battery provided by this utility model;
[0021] Figure 2 This is a side view of a structural schematic diagram of a piezoelectric module provided by this utility model;
[0022] Figure 3 This is a front view of a structural schematic diagram of a battery provided by this utility model;
[0023] Figure 4 This is a schematic diagram of the structure of a battery provided by this utility model;
[0024] Figure 5 This is a schematic diagram of the structure of a battery system provided by this utility model;
[0025] In the diagram: 10-battery cell; 20-piezoelectric module; 30-housing; 201-piezoelectric unit; 202-capacitor; 203-wire; 500-battery; 501-acquisition module; 502-control module. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0027] like Figure 1 , Figure 2 and Figure 3 As shown, this utility model provides a battery, including a battery cell 10, a piezoelectric module 20, and a housing 30; the housing 30 contains the battery cell 10 and the piezoelectric module 20; the piezoelectric module 20 is located on one side of the battery cell 10 and is in contact with the battery cell; the thickness change direction of the piezoelectric module 20 is the same as the volume change direction of the battery cell 10; the piezoelectric module 20 includes a piezoelectric unit 201 and a capacitor 202; the piezoelectric unit 201 is connected to the capacitor 202.
[0028] In this invention, the battery cell and piezoelectric module are placed inside the housing to suppress volume changes during the charging and discharging process. The piezoelectric unit in the piezoelectric module will generate a voltage between its two ends after being subjected to volume expansion from the battery cell. Therefore, by setting the piezoelectric module, the voltage change can be controlled to achieve synchronous adjustment with the battery volume change, thereby ensuring the cycle stability and safety of the battery.
[0029] It should be noted that the battery cells are bare cells.
[0030] According to some preferred embodiments, the housing 30 is a rigid housing.
[0031] In this invention, a rigid outer shell is designed to prevent overall deformation of the battery cell. This shell ensures that the shape and structure of the battery are not affected, while providing additional physical protection.
[0032] According to some preferred embodiments, such as Figure 2 As shown, the piezoelectric unit 201 and the capacitor 202 are connected by a wire 203, which can be a copper wire, an aluminum wire, an aluminum alloy wire, or a silver-plated copper wire.
[0033] According to some preferred embodiments, such as Figure 4 As shown, the two ends of the capacitor 202 are respectively connected to the two ends of the piezoelectric unit 201 along the thickness change direction; when the volume of the battery cell 10 expands, it squeezes the piezoelectric unit 201 to generate charge, and the capacitor 202 is charged; when the volume of the battery cell 10 contracts, the capacitor 202 is discharged.
[0034] It should be noted that the two ends of the capacitor are connected to the two ends of the piezoelectric element along the thickness change direction in order to store the charge generated when the piezoelectric element is compressed.
[0035] According to some preferred embodiments, the operating voltage of capacitor 202 is 0 to 10V, and the capacitance is 100 to 1000μF.
[0036] In this invention, energy recovery from the piezoelectric unit can be achieved during the charging and discharging process of the battery cell. Specifically, during charging, the battery cell expands, compressing the piezoelectric unit and generating voltage. The resulting current can be used to charge the capacitor and store energy. During discharging, the battery cell contracts, and the piezoelectric unit thickens accordingly. The inverse piezoelectric effect is used to adjust the battery structure and prevent electrode damage. Therefore, during charging and discharging, the piezoelectric unit can recover the mechanical energy generated by the change in battery cell volume and convert it into electrical energy for the capacitor, thereby improving energy efficiency.
[0037] According to some preferred embodiments, the piezoelectric unit 201 is a thin film made of lead zirconate titanate, polyvinylidene fluoride or lithium niobate.
[0038] According to some preferred embodiments, the thickness of the piezoelectric unit 201 is 0.55 to 1 mm (for example, it can be 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm or 1 mm).
[0039] According to some preferred embodiments, such as Figure 4 As shown, when the cell 10 is a laminated cell, the piezoelectric unit 201 is placed side by side with the laminated cell, and the area of the piezoelectric unit 201 and the contact area between the piezoelectric unit 201 and the laminated cell is the area of the piezoelectric unit 201.
[0040] It should be noted that the laminated cell includes multiple cell laminations. The area of the piezoelectric unit and the area of a single cell lamination are the areas of the largest surface perpendicular to the thickness direction, that is, the product of the surface area and the thickness is its volume. Secondly, the area of the capacitor is ignored here, and the area of the piezoelectric unit 201 is the same as the area of a single cell lamination in the laminated cell.
[0041] According to some preferred embodiments, when the battery cell 10 is a wound battery cell, the piezoelectric unit 201 is wrapped around the outer surface of the wound battery cell, and the contact area between the piezoelectric unit 201 and the wound battery cell is the area of the piezoelectric unit 201, and the housing 30 is wrapped around the outside of the piezoelectric unit 201.
[0042] It should be noted that, ignoring the area of the capacitor, for the wound cell, the area of the piezoelectric unit is the same as the area of the outer surface of the wound cell (i.e., the side area of the wound cell), and the area of the piezoelectric unit in contact with the housing is the same as the side area of the inner layer of the housing.
[0043] like Figure 5 As shown, this utility model also provides a battery system, including: a battery 500, a data acquisition module 501, and a control module 502; the data acquisition module 501 and the control module 502 are respectively connected to the battery; the data acquisition module 501 and the control module 502 are connected.
[0044] The acquisition module 501 is used to acquire the thickness change of the cell 10 in the battery 500 and send it to the control module 502;
[0045] The control module 502 is used to receive the thickness change of the cell 10 and adjust the voltage value of the capacitor 202 in the battery 500 so that the thickness change of the piezoelectric unit 201 is the same as the thickness change of the cell 10.
[0046] According to some preferred embodiments, the acquisition module 501 is used to acquire the charge state of the battery 500 and send it to the control module 502.
[0047] The control module 502 includes a receiving unit, a calculation unit, and a transmitting unit. The receiving unit is used to receive the charge state, the calculation unit is used to calculate the voltage value of the capacitor based on the received charge state, and the transmitting unit is used to send a voltage adjustment command containing the voltage value to the capacitor 202 in the battery 500 to adjust the voltage of the capacitor 202 to the voltage value so that the thickness change of the piezoelectric unit 201 is the same as the thickness change of the cell 10.
[0048] In this invention, since the thickness change of the battery cell is related to the charge state of the battery cell during charging and discharging, the thickness change of the battery cell can be determined by obtaining the charge state of the battery cell. At the same time, the thickness change of the piezoelectric unit is also related to the voltage across its terminals, and this voltage value can be obtained by a capacitor. Therefore, when the thickness of the battery cell changes due to volume expansion, by adjusting the voltage of the capacitor, the thickness change of the compressed piezoelectric unit can be controlled to be the same as the thickness change of the battery cell, thereby suppressing the volume change during the charging and discharging process of the battery, realizing the volume adjustment of the battery during the charging and discharging process, ensuring the stability of the internal structure of the battery cell, and thus ensuring the cycle stability and safety of the battery.
[0049] It should be noted that, Figure 3 and Figure 4 The casing is not shown in the diagram. It should be particularly noted that the terms "upper," "lower," "left," and "right," etc., used in this invention indicate orientation or positional relationships based on the attached diagram. Figures 1 to 4 The orientations or positional relationships shown are only for the purpose of facilitating the description of this utility model and simplifying the description.
[0050] It should be noted that in this article, relational terms such as first and second are used only to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between these entities.
[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A battery, characterized in that, include: Battery cell, piezoelectric module, housing; The housing contains the battery cell and the piezoelectric module; The piezoelectric module is located on one side of the battery cell and is in contact with the battery cell; the thickness change direction of the piezoelectric module is the same as the volume change direction of the battery cell; the piezoelectric module includes a piezoelectric unit and a capacitor; the piezoelectric unit is connected to the capacitor.
2. The battery according to claim 1, characterized in that: The piezoelectric unit is connected to the capacitor by a wire; the wire is a copper wire, an aluminum wire, an aluminum alloy wire, or a silver-plated copper wire.
3. The battery according to claim 1, characterized in that: The two ends of the capacitor are respectively connected to the two ends of the piezoelectric unit along the thickness change direction; wherein, when the volume of the battery cell expands, it squeezes the piezoelectric unit to generate charge, and the capacitor is charged; when the volume of the battery cell contracts, the capacitor is discharged.
4. The battery according to claim 1, characterized in that: The capacitor operates at a voltage of 0–10V and has a capacitance of 100–1000μF.
5. The battery according to claim 1, characterized in that: The piezoelectric unit is a thin film made of lead zirconate titanate, polyvinylidene fluoride, or lithium niobate.
6. The battery according to claim 1, characterized in that: The shell is a rigid shell.
7. The battery according to claim 1, characterized in that: The thickness of the piezoelectric unit is 0.55 to 1 mm.
8. The battery according to any one of claims 1 to 7, characterized in that: When the battery cell is a laminated battery cell, the piezoelectric unit is placed side by side with the laminated battery cell, and the contact area between the piezoelectric unit and the laminated battery cell is the area of the piezoelectric unit.
9. The battery according to any one of claims 1 to 7, characterized in that: When the battery cell is a wound battery cell, the piezoelectric unit is wrapped around the outer surface of the wound battery cell, and the contact area between the piezoelectric unit and the wound battery cell is the area of the piezoelectric unit, and the housing is wrapped around the outside of the piezoelectric unit.
10. A battery system, characterized in that, include: The battery, acquisition module, and control module as described in any one of claims 1 to 9; The acquisition module and the control module are respectively connected to the battery; the acquisition module and the control module are connected. The acquisition module is used to acquire the thickness change of the battery cell in the battery and send it to the control module; The control module is used to receive the thickness change of the battery cell and adjust the voltage value of the capacitor in the battery so that the thickness change of the piezoelectric unit is the same as the thickness change of the battery cell.