Battery pack, battery device and electric device

Abstract

The utility model discloses a battery pack, a battery device and an electric device, and relates to the technical field of batteries. The battery pack comprises a battery cell, a thermal expansion piece and a heating piece, the thermal expansion piece is arranged on at least one side of the battery cell, and the thermal expansion piece is used for generating expansion deformation during heating so as to extrude the battery cell; the heating part is used for heating the thermal expansion part. According to the battery pack disclosed by the invention, the controllable restraining force is applied to the battery cells, so that the energy output of the battery pack is favorably improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery pack, a battery device, and an electrical device. Background Technology

[0002] In current technology, after a period of use, the battery cell capacity rapidly declines until it is completely depleted and must be replaced. When batteries are recycled, residual charge is often still detectable, indicating that there is room for improvement in the energy utilization efficiency of batteries during use.

[0003] Improving the energy utilization rate of batteries during use is one of the directions that existing technologies need to address. Utility Model Content

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, the first aspect of the present invention aims to provide a battery pack that applies a restraining force to the battery cells, thereby helping to improve the energy output of the battery pack.

[0005] The second aspect of this utility model aims to provide a battery device having the above-mentioned battery pack.

[0006] The objective of the third aspect of this utility model is to provide an electrical device having the aforementioned battery pack, or an electrical device having the aforementioned battery pack.

[0007] A battery pack according to a first aspect of the present invention includes: a battery cell, a thermal expansion member, and a heating member. The thermal expansion member is disposed on at least one side of the battery cell and is used to expand and deform during heating to compress the battery cell. The heating member is used to heat the thermal expansion member.

[0008] According to the battery pack of this utility model embodiment, by setting a thermal expansion member, the battery cell is expanded and deformed when absorbing heat, thereby improving the contact tightness of chemical substances inside the battery cell and the efficiency of electrochemical reaction, and thus increasing the energy output and utilization rate of the battery pack; by setting a heating member, the thermal expansion member can be heated as needed, the thermal expansion member can be controlled, and the flexibility of the battery pack can be improved.

[0009] The battery pack according to some optional embodiments of the present invention further includes: a thermal insulation element, the thermal insulation element being located between the battery cell and the thermal expansion element.

[0010] In some alternative embodiments, the thermal expansion element is a shape memory alloy element, which is either a single-pass shape memory alloy element or a two-pass shape memory alloy element.

[0011] According to some optional embodiments of the present invention, the battery cell is a plate-shaped body extending along a first direction, and the thermal expansion member is arranged with the battery cell along a second direction, with the thermal expansion member facing the largest surface of the battery cell.

[0012] Optionally, there are at least two battery cells, and the at least two battery cells and the thermal expansion member are arranged in a row along a second direction, with the thermal expansion member located on at least one side of the battery cells in the same row.

[0013] Alternatively, the heating element is disposed on the side of the thermal expansion member away from the battery cell.

[0014] According to some optional embodiments of the present invention, the battery pack has at least two cells, and a buffer layer is provided between two adjacent cells.

[0015] According to some optional embodiments of the present invention, the battery pack further includes an outer frame; a receiving cavity is formed in the outer frame, and the battery cell, the thermal expansion member and the heating member are located in the receiving cavity.

[0016] In some alternative embodiments, the outer frame surrounds the perimeter to form four sides, at least one of the sides being composed of a bracket; on the same side, two oppositely arranged brackets are spaced apart to form a heat dissipation surface.

[0017] Specifically, the outer frame has two ends along its length as end faces, and at least one end face is composed of a bracket; in the same end face, there is a gap between two oppositely arranged brackets to form a heat dissipation surface.

[0018] In some alternative embodiments, the heating element is a heating film attached to the thermal expansion element.

[0019] Furthermore, the battery pack has a controller, and the heating element is electrically connected to the controller so that the state of the heating element is controlled by the cell capacity of the battery cell.

[0020] Further optionally, the battery cells are arranged in multiple rows, with each row of battery cells having thermal expansion members at both ends, and the multiple rows of battery cells are arranged along a third direction.

[0021] A battery device according to a second aspect of the present invention includes: a tray and at least one battery pack; the battery pack is disposed on the tray. Here, the battery pack is the battery pack described in the first aspect of the present invention.

[0022] According to a third aspect embodiment of the present invention, an electrical device includes a battery pack or a battery device. The battery pack is the battery pack described in the first aspect embodiment of the present invention, and the electrical device is the battery device described in the second aspect embodiment of the present invention.

[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is a front view of the battery pack in some embodiments of the present invention;

[0026] Figure 2 This is a schematic diagram showing the positions of the battery cell, thermal expansion component, heating component, and thermal insulation component in some embodiments of this utility model;

[0027] Figure 3 This is a schematic diagram of the deformation of the thermal expansion component in some embodiments of this utility model;

[0028] Figure 4 This is a perspective view of the battery pack in some embodiments of the present invention;

[0029] Figure 5 This is a schematic diagram of the outer frame structure in some embodiments of this utility model;

[0030] Figure 6 This is a schematic diagram of the battery device in some embodiments of the present invention;

[0031] Figure 7 This is a flowchart illustrating the control strategy of the battery pack in some embodiments of this utility model.

[0032] Figure label:

[0033] Battery device 1000

[0034] Battery pack 100

[0035] Battery cell 10, thermal expansion component 30, heating component 40, heat insulation component 51, buffer layer 52, outer frame 60, heat dissipation surface 602, bracket 63.

[0036] Pallet 200. Detailed Implementation

[0037] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0038] In the description of this utility model, it should be understood that the terms "inner," "outer," "circumferential," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not 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 utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] The following is for reference. Figures 1-6 A battery pack 100 according to a first aspect embodiment of the present invention is described.

[0041] like Figure 1 As shown, the battery pack 100 includes: a battery cell 10. It is worth noting that, firstly, the battery cell 10 is a part of the battery pack 100, and the battery cell 10 stores and releases electrical energy through electrochemical reactions.

[0042] In actual use, factors such as temperature changes and prolonged use may cause insufficient contact between these chemical substances, thus affecting the efficiency of the electrochemical reaction and limiting the battery's maximum output capacity. For example, when using solid-state batteries such as AA and AAA batteries in daily life, some people may try to bite the battery with their teeth to restore a short period of use when the battery appears to be depleted.

[0043] This is precisely to ensure that the electrochemical reaction can continue effectively, by biting to keep the chemicals inside the cell 10 in close contact, thereby increasing usage time and extending service life.

[0044] Therefore, in order to solve this problem, we need to combine Figure 1 The battery pack 100 of this utility model embodiment includes: a thermal expansion member 30 and a heating member 40.

[0045] A thermal expansion member 30 is disposed on at least one side of the battery cell 10. The thermal expansion member 30 is used to expand and deform during heating to compress the battery cell 10. A heating member 40 is used to heat the thermal expansion member 30.

[0046] A thermal expansion member 30 is disposed on at least one side of the battery cell 10. When subjected to heat, the thermal expansion member 30 expands and deforms, thereby exerting pressure on the battery cell 10. This pressure helps to bring the chemical substances inside the battery cell 10 into closer contact, ensuring that the electrochemical reaction can continue to proceed effectively, thereby releasing more electrical energy.

[0047] When it is necessary to improve battery performance or release additional electrical energy, the heating element 40 heats the thermal expansion element 30. As the temperature rises, the thermal expansion element 30 begins to expand and exerts a squeezing effect on the battery cell 10. This squeezing causes the chemical substances inside the battery cell 10 to bind together more tightly, thereby improving the contact between them, allowing the electrochemical reaction to continue more efficiently, and ultimately achieving the purpose of releasing additional electrical energy.

[0048] Optionally, the thermal expansion member 30 can be disposed on one, two, or multiple sides of the battery cell 10 to contact different sides of the battery cell 10.

[0049] Here, the sources of heat absorbed by the thermal expansion member 30 include the heat generated by the heating member 40.

[0050] Specifically, the heat generated by the heating element 40 is conducted to the thermal expansion element 30, causing the thermal expansion element 30 to expand and deform upon heating. This expansion exerts a compressive effect on the battery cell 10, thereby ensuring that the chemical substances inside the battery cell 10 can be in closer contact. This method can effectively maintain or even optimize the conditions of the electrochemical reaction within the battery cell 10, improving the overall performance of the battery. Furthermore, this method ensures that the battery can operate stably under different environmental conditions, while also extending battery life and increasing its safety and reliability. Therefore, the heat provided by the heating element 40 not only helps improve the battery's operating state but also meets the demands of various complex operating environments.

[0051] This application utilizes a heating element 40 to control the expansion of the thermal expansion element 30, achieving a flexible restraint force. Simultaneously, the technical solution of this application simplifies the structure, reduces production costs, and lowers maintenance costs to a certain extent.

[0052] In some optional embodiments, the heating element 40 can precisely control the heating process of the thermal expansion element 30 by using a preset temperature value. This preset temperature value can be selected based on the material properties of the thermal expansion element 30. During the heating process, by rapidly and accurately reaching the preset temperature value, the thermal expansion element 30 can enter its optimal expansion state. This allows the thermal expansion element 30 to compress the battery cell 10 with the most suitable pressure, thereby ensuring optimal contact between the chemical substances inside the battery cell 10, releasing more electrical energy, and improving the overall performance of the battery pack 100.

[0053] Alternatively, the heating element 40 may be in direct or indirect contact with the thermal expansion element 30.

[0054] In some technical solutions, combined with Figure 1 The heating element 40 and the thermal expansion element 30 are in direct contact. This close contact facilitates direct heat transfer from the heating element 40 to the thermal expansion element 30, reducing energy loss during transmission and improving heating efficiency. For example, in applications requiring rapid response and efficient heating, such as the start-up of an electric vehicle battery in a cold environment, direct contact ensures that the thermal expansion element 30 quickly reaches its optimal expansion temperature, thereby providing the necessary compression force to optimize the contact state of the chemical substances inside the cell 10.

[0055] Alternatively, in some technical solutions, the heating element 40 and the thermal expansion element 30 are in indirect contact. For example, a thermally conductive adhesive layer or other form of thermally conductive medium is provided between the heating element 40 and the thermal expansion element 30. This indirect contact not only ensures effective heat transfer but also provides a buffering effect. For instance, using a thermally conductive adhesive layer can provide a certain degree of buffering, absorbing vibration and impact, thereby improving the reliability of the battery pack 100 in complex operating environments.

[0056] In some alternative embodiments, such as Figure 1 and Figure 2 As shown, the battery pack 100 also includes a thermal insulation member 51, which is located between the battery cell 10 and the thermal expansion member 30.

[0057] In the above technical solution, the heat insulation component 51 is disposed between the battery cell 10 and the thermal expansion component 30 to prevent the high temperature generated by the heating component from being directly conducted to the battery cell 10, thereby protecting the battery cell 10 from overheating.

[0058] Optionally, the thermal insulation element 51 extends along the length of the cell 10. This arrangement increases the coverage area of ​​the thermal insulation element 51 on the surface of the cell 10, ensuring more comprehensive thermal insulation protection. It also plays a certain buffering role, absorbing and mitigating mechanical stress caused by external impacts and internal component expansion, thereby improving the overall structural stability of the battery pack 100 and enhancing its adaptability to various operating environments.

[0059] According to some optional embodiments of the present invention, the thermal expansion member 30 is a shape memory alloy member, which is a single-pass shape memory alloy member or a two-pass shape memory alloy member.

[0060] In this application, the thermal expansion member 30 is a shape memory alloy member, which can be a two-way shape memory alloy member. This two-way shape memory alloy member has the ability to exhibit different shapes at different temperatures. Specifically, at a first temperature, the two-way shape memory alloy member retains its initial first shape; while at a second temperature, it deforms into a second shape. When the heating member 40 heats the two-way shape memory alloy member from the first temperature to the second temperature, the two-way shape memory alloy member deforms into the second shape. Please refer to... Figure 3 , Figure 3 The image shows the state of the thermal expansion member 30 after deformation, with localized expansion occurring in its area. This expansion allows the thermal expansion member 30 to effectively compress the battery cell 10, thereby ensuring closer contact between the chemical substances inside the battery cell 10, optimizing the conditions for the electrochemical reaction, and improving the efficiency of the electrochemical reaction. Once heating is stopped and the two-way shape memory alloy component cools back to its initial temperature, its shape returns to its original state, thus releasing the pressure on the battery cell 10.

[0061] In this application, the shape memory alloy of the thermal expansion member 30 can also be a one-way shape memory alloy. Specifically, when the heating member 40 heats the one-way shape memory alloy to its deformation temperature, the one-way shape memory alloy will deform. This deformation applies a restraining force to the cell 10, making the chemical substances inside the cell 10 more closely contacted, thereby optimizing the electrochemical reaction conditions and improving battery performance and efficiency.

[0062] Of course, this application is not limited to this; it can also include other materials that can change shape or volume when heated. For example, ferroelectric materials such as BaTiO3 and barium titanate, magnetostrictive materials such as TbFe2 and Terfenol-D, and expanded ceramics such as Li2SiO3 and Na2ZrSiO5. These materials can undergo certain deformation or volume changes when heated, thereby applying the necessary compressive force to the battery cell 10.

[0063] In some alternative embodiments, the thermal expansion element 30 is a NiTi alloy. The NiTi alloy has a shape memory effect.

[0064] Alternatively, the NiTi alloy component can be a NiTi plate. After deformation under specific conditions, the NiTi plate can automatically return to its original shape when temperature or stress changes. This material can achieve significant reversible elastic deformation under stress and quickly return to its original shape after stress is removed, without permanent deformation or cracking, greatly improving the reliability and durability of the battery pack 100.

[0065] Furthermore, NiTi plates exhibit excellent corrosion resistance, remaining stable and resistant to corrosion in various corrosive environments such as acids, alkalis, and salts. This makes NiTi plates ideal for use in battery packs 100 that require long-term stable operation. Utilizing this high corrosion resistance not only extends the lifespan of battery packs 100 but also reduces maintenance needs and costs, thereby improving the overall system's safety and reliability.

[0066] In some specific embodiments, see Figure 2 The battery cell 10 is a plate-shaped body extending along the first direction, and the thermal expansion member 30 is arranged with the battery cell 10 along the second direction, with the thermal expansion member 30 facing the largest surface of the battery cell 10.

[0067] In the above technical solution, the battery cell 10 is constructed as a plate extending along a first direction. This configuration provides the battery cell 10 with a large surface area, facilitating heat dissipation and optimizing energy density. The thermal expansion member 30 is arranged along a second direction with the battery cell 10, and the thermal expansion member 30 is positioned towards the largest surface of the battery cell 10. Here, the second direction is perpendicular to the main extension direction of the battery cell 10. This arrangement ensures that the thermal expansion member 30 can effectively apply uniform pressure to the battery cell 10 during heating, maximizing the contact area and thus improving the compression effect.

[0068] Alternatively, there may be at least two battery cells 10, and at least two battery cells 10 and thermal expansion members 30 are arranged in a row along the second direction, with the thermal expansion members 30 located on at least one side of the battery cells 10 in the same row.

[0069] Specifically, if the thermal expansion member 30 is located on one side of the same row of battery cells 10, then the battery cell 10 is subjected to a restraining force through unilateral expansion, which simplifies the structure and reduces costs.

[0070] Or, combine Figure 4 The thermal expansion member 30 is simultaneously disposed on both sides of the same row of cells 10 to achieve balanced double-sided restraint on the row of cells 10, ensuring closer contact of chemical substances inside the cells 10, optimizing electrochemical reaction efficiency, and improving the overall performance and stability of the battery.

[0071] In some alternative embodiments, such as Figure 2 As shown, the heating element 40 is located on the side of the thermal expansion element 30 away from the battery cell 10. This effectively conducts heat to the thermal expansion element 30, avoiding direct heating of the battery cell 10 and preventing potential damage to the battery cell 10 due to local overheating.

[0072] In some specific embodiments, such as Figure 2 As shown, there are at least two battery cells 10, and a buffer layer 52 is provided between two adjacent battery cells 10.

[0073] First, the buffer layer 52 can physically isolate adjacent cells 10, absorb some external forces, reduce mechanical damage caused by vibration, impact, etc., and protect the cells 10.

[0074] Secondly, the buffer layer 52 also has a certain heat insulation performance, which can prevent the overheating of one cell 10 from affecting the adjacent cells 10.

[0075] In addition, the buffer layer 52 provides extra electrical insulation, reduces the risk of short circuits, and improves the safety of the battery pack 100.

[0076] The buffer layer 52 is preferably an aerogel layer. This is because aerogel has a low thermal conductivity. Placing an aerogel layer between adjacent cells 10 effectively reduces heat transfer from one cell 10 to another. Simultaneously, the aerogel layer is lightweight, contributing to the weight reduction goal of the battery pack 100. Furthermore, the aerogel layer possesses elasticity and flexibility, which helps absorb and disperse impact forces, reducing damage to the cells 10 caused by vibration or collision, thereby improving the reliability and durability of the battery pack 100.

[0077] According to some optional battery packs 100 of the present invention, an outer frame 60 is also included; a receiving cavity is formed in the outer frame 60, and the battery cell 10, the thermal expansion member 30 and the heating member 40 are located in the receiving cavity.

[0078] The outer frame 60 provides a stable mounting space for multiple components within the battery pack 100, thereby improving the reliability of the battery pack 100.

[0079] Meanwhile, the outer frame 60 also provides necessary support and restraint for the thermal expansion member 30 when it expands due to heat, making the expansion process more uniform and directional. Specifically, when the heating element 40 heats the thermal expansion member 30, the thermal expansion member 30 expands, increasing the volume it occupies in the receiving cavity, thereby exerting a suitable squeezing effect on the battery cell 10. Due to the presence of the outer frame 60, this squeezing is concentrated and stable, which helps to make the chemical substances inside the battery cell 10 more closely contacted, optimize electrochemical reaction conditions, and improve battery performance and efficiency.

[0080] Optionally, the outer frame 60 is made of high-strength metal or alloy components. The use of high-strength metal or alloy components provides robust protection and support for the battery pack 100. These components possess high mechanical strength, durability, and stability, effectively resisting external impacts, vibrations, and other physical damage. Furthermore, these materials also have certain thermal conductivity, which helps dissipate heat from within the battery pack 100, reducing the occurrence of overheating.

[0081] Alternatively, the outer frame 60 may be a structure that surrounds all four sides or all six sides.

[0082] In some specific embodiments, such as Figure 4 As shown, the outer frame 60 surrounds the perimeter, forming four sides.

[0083] Here, the outer frame 60 wraps around the battery pack 100 to ensure the overall structural stability and robustness of the battery pack 100, providing multi-faceted physical protection.

[0084] In this case, at least one side of the outer frame 60 is composed of a bracket 63. Specifically, combined with Figure 5 The side includes four supports 63, which are connected end to end to form a complete side structure. This arrangement provides some advantages by creating a certain gap between two oppositely positioned supports 63.

[0085] First, the spaced structure allows heat to dissipate more easily from inside the battery pack 100, preventing overheating and helping to maintain the battery's optimal operating temperature. Second, it reduces production costs by decreasing the amount of materials used, and also contributes to weight reduction.

[0086] Optionally, the outer frame 60 may have one side composed of the bracket 63, or two or three sides composed of the bracket 63, or all four sides of the outer frame 60 may be composed of the bracket 63, in order to maximize the heat dissipation effect.

[0087] In some alternative embodiments, the two ends of the outer frame 60 along its length are end faces, and at least one end face is composed of a bracket 63; in the same end face, two oppositely arranged brackets 63 are spaced apart to form a heat dissipation surface 602.

[0088] In this way, good ventilation and heat dissipation can be achieved at its end, which helps maintain the battery's optimal operating temperature and reduces the battery pack's overheating problem.

[0089] In some preferred embodiments, both end faces of the outer frame 60 are composed of brackets 63.

[0090] In some specific embodiments, the heating element 40 is a heating film attached to the thermal expansion element 30.

[0091] The heating film has good adhesion and can fit tightly against the surface of the thermal expansion component 30, ensuring that heat is efficiently and evenly conducted to the thermal expansion component 30. This not only helps to control the thermal expansion component 30, but also avoids local overheating problems caused by poor contact, thereby improving the overall stability and safety of the battery pack 100.

[0092] According to some optional embodiments of the present invention, the battery pack 100 has a controller, and the heating element 40 is electrically connected to the controller so that the state of the heating element 40 is controlled by the capacity of the battery cell 10.

[0093] Here, the controller is adapted to adjust the working state of the heating element 40 according to the capacity status of the battery cell 10.

[0094] For example, when the cell 10 has a low capacity, the controller activates the heating element 40, causing the thermal expansion element 30 to expand and provide restraint force to the cell 10, thereby improving the electrochemical reaction efficiency. Conversely, when the cell 10 is at a high capacity or when no additional heat is needed, the controller shuts off the heating element 40 to stop heating the thermal expansion element 30. By managing the operation of the heating element 40, the battery pack 100 is ensured to maintain optimal operating conditions under different operating conditions.

[0095] In some alternative embodiments, combined with Figure 6 The battery cells 10 are arranged in multiple rows, and each row of battery cells 10 has thermal expansion elements 30 at both ends. The multiple rows of battery cells 10 are arranged along a third direction.

[0096] By installing thermal expansion elements 30 at both ends of each row of cells 10, it is ensured that each row of cells 10 receives uniform restraint force during operation, thereby enhancing the efficiency of the battery pack 100 system.

[0097] Optionally, when the battery pack 100 is used in a vehicle, the on-board charging module is electrically connected to the heating element 40. Here, the on-board charging module is used to supply power to the heating element 40.

[0098] like Figure 6 As shown, a battery device 1000 according to a second aspect embodiment of the present invention includes a tray 200 and a battery pack 100. At least one set of battery packs 100 from the first aspect embodiment is disposed on the tray 200.

[0099] The tray 200 provides a robust mounting platform for the battery pack 100. During use, the tray 200 ensures that the battery pack 100 can be secured, reducing damage caused by vibration or impact.

[0100] Using the optimized battery pack 100, the heating element 40 induces thermal expansion to compress the battery cells 10, thereby improving the efficiency of the electrochemical reaction and enhancing the power output. This configuration enables the battery device 1000 to release and utilize energy more efficiently under various operating conditions.

[0101] Alternatively, the battery device 1000 may be a battery pack.

[0102] The electrical device according to a third aspect embodiment of the present invention includes the battery pack 100 in the first aspect embodiment; or, it includes the battery device 1000 in the second aspect embodiment.

[0103] It is important to understand that electrical devices can be transportation vehicles such as cars and ships, or energy storage systems.

[0104] The following is for reference. Figure 1 - Figure 6 The battery pack 100 according to an embodiment of the present invention is described in detail with reference to a specific example. It is to be understood that the following description is merely illustrative and not intended to limit the scope of the invention.

[0105] Reference Figure 1 The battery pack 100 includes: a battery cell 10, a thermal expansion component 30, a heating component 40, a heat insulation component 51, a buffer layer 52, and an outer frame 60.

[0106] The outer frame 60 is composed of a support 63, and a receiving cavity is formed inside the outer frame 60.

[0107] Reference Figure 5 On the same side of the outer frame 60, there is a heat dissipation surface 602 between the support 63 and the frame 60.

[0108] The battery cell 10, thermal expansion component 30, heating component 40, heat insulation component 51, and buffer layer 52 are all located inside the receiving cavity.

[0109] Reference Figure 6 The battery cell 10 is arranged in multiple rows, with the multiple rows of battery cells 10 arranged along a third direction.

[0110] Reference Figure 2 and Figure 4 Each row has multiple cells 10 arranged along a second direction, and each cell 10 extends along a first direction, wherein the cell 10 is a plate-shaped body.

[0111] Reference Figure 2 The buffer layer 52 is located between two adjacent cells 10.

[0112] Reference Figure 2 and Figure 4 Each row of battery cells 10 has thermal expansion members 30 at both ends. The thermal expansion members 30 are positioned facing the largest surface of the battery cell 10.

[0113] The thermal insulation element 51 is located between the battery cell 10 and the thermal expansion element 30.

[0114] The heating element 40 is located on the side of the thermal expansion member 30 away from the battery cell 10, and the heating element 40 is a heating film used to heat the thermal expansion member 30.

[0115] Reference Figure 3 The thermal expansion component 30 is a shape memory alloy component. The thermal expansion component 30 expands and deforms when heated to compress the battery cell 10.

[0116] The following is for reference. Figure 7 A flowchart describing the control strategy of the battery pack 100 according to an embodiment of the present invention is provided.

[0117] First, monitor the effective capacity of cell 10. If the effective capacity of cell 10 exceeds the target value, continue monitoring the cell capacity; if it does not exceed the target value, activate the on-board charging module to supply power.

[0118] Next, the heating element begins to heat up. During the heating process, the cell capacity is checked again to see if it exceeds the target value. If it still does not exceed the target value, heating continues; once the cell capacity exceeds the target value, the battery pack 100 will provide restraint to optimize the contact density of the chemical substances inside the cell, thereby improving the electrochemical reaction efficiency and the energy output of the battery pack.

[0119] This strategy ensures that optimal performance is maintained by controlling the heating element by detecting the cell capacity, thereby creating a restraining force.

[0120] Other components of the battery pack 100 according to the present invention, such as battery devices and power-consuming devices, as well as their operation, are known to those skilled in the art and will not be described in detail here.

[0121] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0122] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, include: Battery cell; A thermal expansion member is disposed on at least one side of the battery cell, the thermal expansion member being used to generate expansion deformation during heating to compress the battery cell; A heating element, which is used to heat the thermal expansion element.

2. The battery pack according to claim 1, characterized in that, Also includes: A thermal insulation element is located between the battery cell and the thermal expansion element.

3. The battery pack according to claim 1, characterized in that, The thermal expansion component is a shape memory alloy component, which can be a single-pass shape memory alloy component or a two-pass shape memory alloy component.

4. The battery pack according to claim 1, characterized in that, The battery cell is a plate-shaped body extending along a first direction, and the thermal expansion member is arranged along a second direction with the battery cell facing the largest surface of the battery cell.

5. The battery pack according to claim 1, characterized in that, The battery cell is at least two, and the at least two battery cells and the thermal expansion member are arranged in a row along the second direction, with the thermal expansion member located on at least one side of the battery cells in the same row.

6. The battery pack according to claim 5, characterized in that, The heating element is located on the side of the thermal expansion member away from the battery cell.

7. The battery pack according to claim 1, characterized in that, The battery cell is at least two, and a buffer layer is provided between two adjacent battery cells.

8. The battery pack according to any one of claims 1-7, characterized in that, It also includes the outer frame; An accommodating cavity is formed within the outer frame, and the battery cell, the thermal expansion member, and the heating member are located within the accommodating cavity.

9. The battery pack according to claim 8, characterized in that, The outer frame surrounds the perimeter to form four sides, at least one of the sides being composed of a bracket; in the same side, two brackets arranged opposite each other are spaced apart to form a heat dissipation surface.

10. The battery pack according to claim 9, characterized in that, The outer frame has two ends along its length as end faces, and at least one end face is composed of a bracket; in the same end face, there is a gap between two brackets arranged opposite each other to form a heat dissipation surface.

11. The battery pack according to any one of claims 1-7, characterized in that, The heating element is a heating film attached to the thermal expansion element.

12. The battery pack according to any one of claims 1-7, characterized in that, The battery pack has a controller, and the heating element is electrically connected to the controller so that the state of the heating element is controlled by the cell capacity of the battery cell.

13. The battery pack according to any one of claims 1-7, characterized in that, The battery cells are arranged in multiple rows, and each row of battery cells has thermal expansion elements at both ends. The multiple rows of battery cells are arranged along a third direction.

14. A battery device, characterized in that, include: tray; At least one battery pack according to any one of claims 1-13 is disposed on the tray.

15. An electrical appliance, characterized in that, It includes the battery pack according to any one of claims 1-13; or, it includes the battery device according to claim 14.

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