Battery pack and electric equipment

Abstract

The invention relates to the technical field of battery assembling and manufacturing, in particular to a battery pack and electric equipment. The battery pack comprises batteries, and the batteries comprise solid-state batteries and / or semi-solid-state batteries; the battery is arranged in the shell; the temperature conversion piece is arranged in the shell, the temperature conversion piece is used for transmitting pressure to the battery, and the temperature conversion piece has a preset conversion temperature; when the temperature in the shell is lower than the conversion temperature, the temperature conversion piece is in a first form and is used for transmitting pressure to the battery; and when the temperature in the shell reaches the conversion temperature, the temperature conversion piece is in the second form and is used for reducing the pressure transmitted to the battery. By utilizing the characteristics of the solid-state battery, necessary external force is converted into an explosion-proof means, so that the problem of thermal runaway is solved, the safety coefficient of the battery pack is improved, the structural design is simple, the cost is low, the influence on the energy density and the performance of the battery is reduced, and the battery pack is passively responded and automatically triggered.

Description

Technical Field

[0001] This application relates to the field of battery assembly and manufacturing technology, and in particular to a battery pack and electrical equipment. Background Technology

[0002] Currently, during battery assembly and manufacturing, explosion-proof devices are usually installed in the casing. In the event of thermal runaway, the battery is cooled and vented to dissipate heat, thereby preventing heat spread and improving battery safety performance.

[0003] However, in the existing technology, the components of explosion-proof devices are complex, the design and installation process is cumbersome, and the cost is high. At the same time, the increased number of components leads to an increase in weight, which causes a decrease in battery energy density and seriously affects battery performance. Summary of the Invention

[0004] Based on this, this application provides a battery pack and electrical equipment to solve the problems of complex composition, cumbersome installation, and impact on battery performance caused by explosion-proof devices.

[0005] On the one hand, this application provides a battery pack, including:

[0006] The battery, including solid-state batteries and / or semi-solid-state batteries, has a force-applying component that applies pressure to the battery;

[0007] The battery is housed within the casing.

[0008] Temperature conversion element, which is located in the housing, is used to transmit pressure to the battery and has a preset conversion temperature.

[0009] When the temperature inside the casing is lower than the transition temperature, the temperature transition element is in its first form, used to transmit pressure to the battery.

[0010] When the temperature inside the casing reaches the transition temperature, the temperature transition element changes to a second form to reduce the pressure transmitted to the battery.

[0011] In one possible implementation, the temperature transition element has high strength and high hardness in a first form to transmit pressure to the battery; the temperature transition element has high elasticity in a second form to reduce the pressure transmitted to the battery through compression deformation.

[0012] In one possible implementation, the transition temperature of the temperature transition element is between 60 and 100°C.

[0013] In one possible implementation, the temperature transition element is made of a cross-linked polymer material.

[0014] In one possible implementation, the temperature transition element is made of cross-linked polycaprolactone.

[0015] In one possible implementation, the force-applying component is the housing, and the temperature-changing component is located between the housing and the battery.

[0016] In one possible implementation, the housing includes an end plate and / or a side plate, with a temperature transition element disposed between the battery and the end plate and / or between the battery and the side plate.

[0017] In one possible implementation, there are at least two end plates and / or at least two side plates, with at least two end plates arranged opposite each other along a second direction and / or at least two side plates arranged opposite each other along a first direction, the first and second directions intersecting.

[0018] In one possible implementation, the housing also includes a crossbeam that divides the housing into multiple accommodating areas, with multiple batteries respectively disposed in different accommodating areas, and a temperature transition element is provided between the crossbeam and the batteries.

[0019] In one possible implementation, at least two temperature transition elements are included, with the two temperature transition elements respectively disposed on opposite sides of the battery.

[0020] In one possible implementation, the battery comprises multiple batteries arranged sequentially, with the temperature transition element located on the outermost battery on the side furthest from the other batteries.

[0021] In one possible implementation, the battery pack includes multiple batteries, and the battery pack also includes electrical connectors that connect adjacent batteries.

[0022] On the other hand, this application provides an electrical device, including an electrical appliance and the aforementioned battery pack, the battery pack being used to provide electrical energy to the electrical appliance.

[0023] The battery pack and electrical equipment provided in this application utilize a temperature transition element within the battery pack casing. This element transmits the pressure applied to the battery. Since the batteries include solid-state and / or semi-solid-state batteries, the inherent characteristics of solid-state batteries are utilized to convert the external force necessary for normal electrical performance into a means of explosion protection. In its first state below the transition temperature, the temperature transition element transmits pressure to the battery, maintaining normal battery operation. When the temperature reaches the transition temperature, the second state of the element reduces or eliminates the transmitted pressure, increasing the battery's impedance and preventing normal operation. This rapidly reduces the current in the battery circuit, decreasing heat generation and achieving temperature control, thus solving the problem of thermal runaway and improving the battery pack's safety. Furthermore, different temperature transition elements can be designed with different response temperatures to adapt to different batteries. Integrating the temperature transition element into a normally used structure within the battery pack eliminates the need for additional devices, reducing installation steps. The structural design is simple and low-cost. The use of the temperature transition element results in minimal weight gain and minimizes the impact on battery energy density and performance. Based on the inherent properties of the material, it passively responds and automatically triggers, activating upon reaching the transition temperature. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is one of the structural schematic diagrams of the battery pack provided in the embodiments of this application;

[0026] Figure 2 This is a schematic diagram of pressure transmission in the battery pack according to an embodiment of this application;

[0027] Figure 3 This is a graph showing the relationship between the impedance of a solid-state battery and external pressure.

[0028] Figure 4 for Figure 1 The diagram shows the structure of the battery pack when the temperature exceeds the transition temperature.

[0029] Figure 5 This is a second schematic diagram of the battery pack provided in an embodiment of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 100-Battery pack; 101-Battery pack positive; 102-Battery pack negative; 10-Housing; 11-End plate; 12-Side plate; 13-Crossbeam; 20-Battery; 21-Electrical connector; 30-Temperature transition component.

[0032] First direction -X, second direction -Y. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this application 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 application.

[0036] The terms “first,” “second,” and “third” (if any) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0037] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or display that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or display.

[0038] Currently, during battery assembly and manufacturing, explosion-proof devices are usually installed in the casing. In the event of thermal runaway, the battery is cooled and vented to dissipate heat, thereby preventing heat spread and improving battery safety performance.

[0039] However, in the existing technology, the components of explosion-proof devices are complex, the design and installation process is cumbersome, and the cost is high. At the same time, the increased number of components leads to an increase in weight, which causes a decrease in battery energy density and seriously affects battery performance.

[0040] There are many problems when a battery experiences thermal runaway, among which an irreversible surge in temperature is one of the most serious. If the rapid rise in temperature can be interrupted or slowed down, there will be more time and opportunities to deal with the thermal runaway problem, bring the temperature down, or even eliminate the high temperature directly.

[0041] After repeated consideration and verification, the inventors discovered that in solid-state or semi-solid-state batteries, because the electrolyte is solid, a large pressure is required to ensure normal battery operation, bringing the internal solid electrolyte into contact with the positive and negative electrodes and establishing electrical connection between them. For example, in existing processes, maintaining normal performance of a solid-state battery requires an external pressure of over 20 MPa. When the external pressure decreases, the impedance in the solid-state battery gradually increases; conversely, when the pressure falls below a certain value, the impedance increases rapidly. Furthermore, when thermal runaway occurs, the internal temperature rises rapidly. Therefore, based on the characteristics of the solid-state battery electrolyte, a passively triggered safety structure can be designed. When the temperature rises, the pressure acting on the battery is reduced, causing the impedance to increase rapidly, reducing the current in the battery circuit, thereby balancing the battery temperature and mitigating the problem of battery runaway.

[0042] In view of this, this application provides a battery pack, comprising: a battery, including a solid-state battery and / or a semi-solid-state battery, the battery pack having a force-applying member for applying pressure to the battery; a housing, the battery being disposed in the housing; a temperature transition member, the temperature transition member being disposed in the housing, the temperature transition member being used to transmit pressure to the battery, the temperature transition member having a preset transition temperature; when the temperature inside the housing is lower than the transition temperature, the temperature transition member is in a first state, used to transmit pressure to the battery to enable the battery to operate normally; when the temperature inside the housing reaches the transition temperature, the temperature transition member is in a second state, used to reduce the pressure transmitted to the battery, thereby increasing the battery's impedance.

[0043] By incorporating a temperature-transfer element within the battery pack casing, and transmitting the pressure applied to the battery through this element, the external force necessary for the normal electrical performance of the solid-state battery (including solid-state and / or semi-solid-state batteries) is transformed into a means of explosion protection, utilizing the inherent characteristics of solid-state batteries. In its first state below the transition temperature, the temperature-transfer element transmits pressure to the battery, maintaining normal operation. When the transition temperature is reached, the second state of the element reduces or eliminates the transmitted pressure, increasing the battery's impedance and preventing normal operation. This rapidly reduces the current in the battery circuit, decreasing heat generation and achieving temperature control, thus solving the problem of thermal runaway and improving the safety factor of the battery pack. Furthermore, different temperature-transfer elements can be designed with different response temperatures to adapt to different batteries. Integrating the temperature-transfer element into the battery pack's normal operating structure requires no additional devices, reducing installation steps. The structural design is simple and low-cost, with minimal weight gain and minimal impact on battery energy density and performance. Based on the inherent properties of the material, it passively responds and automatically triggers, activating upon reaching the transition temperature.

[0044] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0045] Figure 1 This is one of the structural schematic diagrams of the battery pack provided in the embodiments of this application. Figure 2 This is a schematic diagram of pressure transmission in the battery pack according to an embodiment of this application. Figure 3 This is a graph showing the relationship between the impedance of a solid-state battery and external pressure. Figure 4 for Figure 1 The diagram shows the structure of the battery pack when the temperature exceeds the transition temperature. Figure 5 This is a second schematic diagram of the battery pack provided in an embodiment of this application.

[0046] like Figure 1As shown, the battery pack 100 provided in this embodiment includes a housing 10, a battery 20, and a temperature conversion element 30. The battery 20 and the temperature conversion element 30 are respectively disposed in the housing 10.

[0047] The temperature conversion element 30 has a preset conversion temperature. When the temperature inside the housing 10 is lower than the conversion temperature, the temperature conversion element 30 is in a first state, used to transmit pressure to the battery 20. When the temperature inside the housing 10 reaches the conversion temperature, the temperature conversion element 30 is in a second state, used to reduce the pressure transmitted to the battery 20.

[0048] In one possible implementation, the temperature transition element 30 is an amorphous polymer material with a glass transition temperature. Below its glass transition temperature, the temperature transition element 30 exhibits the characteristics of a rigid plastic (first form), capable of transmitting pressure and stress. When the external environment exceeds the glass transition temperature, the temperature transition element 30 softens, reducing its strength and hardness, transforming from a hard plastic into a soft, highly elastic rubber (second form). At this point, the temperature transition element 30 will compress and deform under stress, unable to fully transmit external pressure.

[0049] In another possible implementation, the temperature-changing element 30 can also be made of other materials, as long as they possess a transformation temperature for changing shape. For example, a shape memory alloy can deform at a certain temperature (i.e., the transformation temperature). At low temperatures (i.e., below the transformation temperature), the shape memory alloy can fold and deform (first form), supporting the battery 20 and thus providing sufficient strength to transmit applied pressure. When heated to a certain temperature (i.e., above the transformation temperature), the shape memory alloy returns to its original shape (second form), thereby restoring the folded portion, reducing the thickness of the shape memory alloy, and no longer supporting the battery 20, thus reducing the pressure transmitted to the battery 20.

[0050] The battery 20 includes a solid-state battery or a semi-solid-state battery. The battery pack 100 has a force-applying member that applies pressure to the battery 20, and a temperature-transfer member 30 is used to transmit the pressure provided by the force-applying member to the battery 20.

[0051] like Figure 2 As shown, in one possible implementation, the force-applying component is the housing 10, and the housing 10 in the battery pack 100 applies pressure to the battery 20. The temperature transition element 30 is disposed between the housing 10 and the battery 20, and the housing 10 applies pressure to the battery 20 through the temperature transition element 30.

[0052] Specifically, the battery pack 100 is assembled and formed in the packaging stage. At this time, the temperature changer 30 and the battery 20 can be pressurized, and then the housing 10 is assembled, so that the housing 10 applies pressure to the battery 20.

[0053] Furthermore, after assembly, the battery 20 in the battery pack 100 is under high pressure. High pressure helps to ensure the stability and continuity of the electrolyte, thereby improving the battery's efficiency and lifespan. High pressure also helps to improve the battery's energy density and power density, thereby improving the battery's cost-effectiveness and market competitiveness. High pressure also helps to improve the battery's safety performance, reducing problems such as short circuits and explosions, and providing users with a safer and more reliable power solution.

[0054] In another possible implementation, the housing 10 also contains other components, such as elastic membranes or tapes. These components act as force-applying elements, covering the outside of the temperature transition element 30 and the battery 20 by means of tension, thereby applying pressure to the battery 20 through the temperature transition element 30. The housing 10 serves only a protective and support function.

[0055] In other possible implementations, the force-applying component can also be formed together with the housing 10 and other components.

[0056] Since battery 20 includes solid-state batteries or semi-solid-state batteries, its electrolyte is a solid electrolyte. The interface contact between the positive and negative electrodes is ensured by the solid electrolyte. A considerable amount of external pressure needs to be applied to battery 20 to achieve electrical connection between the positive and negative electrodes in battery 20 in order to achieve sufficiently good electrical performance and ensure normal use of battery 20.

[0057] like Figure 3 As shown, the horizontal axis represents the battery impedance, and the vertical axis represents the pressure exerted on the battery. The internal impedance and current-carrying capacity of battery 20 are related to the external pressure. When the external pressure decreases, the contact between the solid electrolyte and the positive and negative electrodes inside battery 20 deteriorates, and the impedance in battery 20 gradually increases. However, when the pressure falls below a certain value, the impedance in battery 20 increases rapidly, thereby causing the current in the battery 20 circuit to decrease rapidly.

[0058] like Figure 1 As shown, when the battery pack 100 is working normally, its heat generation and heat dissipation are balanced. The temperature inside the casing 10 is lower than the transition temperature. The temperature transition element 30 is in a glassy state and has high strength and high hardness, thereby transmitting pressure to the battery 20 and maintaining the normal operation of the battery 20.

[0059] like Figure 4As shown, when the battery pack 100 malfunctions, the discharge of the battery 20 increases, resulting in a surge in heat generation. This causes the temperature inside the casing 10 to rise rapidly, reaching or exceeding the transition temperature. The temperature of the battery 20 then heats the temperature transition element 30, causing it to reach its transition temperature. The temperature transition element 30 changes shape, transforming from a hard plastic to an elastic rubber body. The pressure applied to it causes it to compress and deform, diluting the external pressure. A gap appears between the temperature transition element 30 and the battery 20, impairing pressure transmission and reducing or eliminating pressure transmission to the battery 20. The reduced force on the battery 20 increases its impedance and decreases its current, reducing its power output or even causing it to stop working. This reduces heat generation and lowers the temperature, controlling the subsequent temperature rise of the battery 20, balancing the battery temperature, and automatically resolving the temperature runaway problem.

[0060] The battery pack 100 has a simple structure, passive response, and automatic triggering, which reduces the problem of failure. It does not require additional signal acquisition or modules, making it fast and convenient. It requires no maintenance or regular inspection, and its integrated design reduces additional installation work.

[0061] In one possible implementation, the transition temperature of the temperature transition element 30 is between 60 and 100°C.

[0062] By designing the transition temperature of the temperature changer 30 to be between 60-100℃, which matches the normal operating range of the battery 20 and the temperature during thermal runaway, the temperature changer 30 can reduce the pressure transmitted to the battery 20 when thermal runaway occurs, thereby improving the safety of the battery 20.

[0063] In one possible implementation, the temperature transition element 30 is made of a polymer cross-linked material.

[0064] Cross-linked polymer materials possess a three-dimensional network structure. Due to their formation through chemical or physical cross-linking, these materials exhibit excellent physical and chemical properties, including high strength, corrosion resistance, aging resistance, and good dimensional stability. Therefore, the temperature transition element 30 made from cross-linked polymer materials can improve the pressure it can withstand and the stability of pressure transmission, thereby enhancing the operational stability of the battery pack 100 and extending its service life.

[0065] In one possible implementation, the temperature transition element 30 is made of cross-linked polycaprolactone (PCL). The transition temperature of polycaprolactone is its glass transition temperature.

[0066] The glass transition temperature of cross-linked polycaprolactone is around 60°C, which is consistent with the normal operating temperature of common solid-state batteries and / or semi-solid-state batteries, thus making it widely applicable.

[0067] Understandably, different transition temperatures can be designed to achieve a safe response, based on actual needs such as controlling the use of battery 20, maintaining the efficient operation of battery 20, adapting to different batteries 20 or other requirements. Then, based on the transition temperature and other usage conditions, different materials can be found or selected to synthesize, thereby obtaining battery packs 100 with different response temperatures. For example, different temperature transition components 30 can be obtained by designing different polymer crosslinking materials.

[0068] Understandably, the structure of the temperature transfer element 30 is not specifically limited and can be designed according to the structure of the housing 10 and the arrangement of the battery 20, as long as the applied pressure can be transmitted to the battery 20.

[0069] For example, it can be designed as a partition and installed on the inner wall of the housing 10 to apply pressure to the entire battery 20 in the battery pack 100; different temperature transition elements 30 can be designed for different batteries 20; or different arrangements of temperature transition elements 30 can be designed to improve the stability and uniformity of the pressure on the battery 20; multiple layers of the same or different temperature transition elements 30 can be used to transmit pressure, so that the battery pack 100 can still be used inefficiently when the temperature exceeds a certain range, and completely stop working when it exceeds another range, etc.

[0070] In one possible implementation, the housing 10 is used to apply pressure to the battery 20, and the temperature transition element 30 is disposed between the housing 10 and the battery 20.

[0071] Therefore, the housing 10 is made of a rigid material; otherwise, the transmitted pressure would be reduced or impossible to transmit.

[0072] In one possible implementation, the housing 10 is made of metal and / or rigid plastic, such as steel, aluminum alloy, various profiles, etc.

[0073] In one possible implementation, the temperature transition element 30 includes two elements, which are respectively disposed on opposite sides of the battery 20, thereby transmitting the pressure applied to the battery 20 from both sides.

[0074] In one possible implementation, the temperature transition element 30 may also be a single element located on one side of the battery 20, with the other side of the battery 20 abutting against the housing 10 or other support member, thereby allowing the temperature transition element 30 to transmit the pressure applied to the battery 20 from one side.

[0075] In one possible implementation, the battery 20 comprises multiple batteries. The multiple batteries 20 are arranged sequentially. The temperature transition element 30 is located on the side of the outermost battery 20 away from the other batteries 20.

[0076] Specifically, multiple batteries 20 can be arranged in a stacked manner so that the pressure received can be transferred between adjacent batteries 20, thereby applying pressure to multiple batteries 20 simultaneously through the temperature transition element 30 located on the outermost side.

[0077] Specifically, there can be two temperature transition elements 30, which are respectively located on the outermost side of the plurality of batteries 20. That is, the temperature transition elements 30, the plurality of batteries 20 and the temperature transition elements 30 are stacked in sequence, so that pressure is applied to the plurality of batteries 20 from both sides at the same time; or there can be one temperature transition element 30, which is located on the outside of one of the outermost batteries 20, so that pressure is applied to the plurality of batteries 20 from one side.

[0078] In one possible implementation, the housing 10 includes an end plate 11 and a side plate 12. The end plate 11 and the side plate 12 are connected end to end, forming an outer frame surrounding the battery 20. The end plate 11 and / or the side plate 12 of the housing 10 are used to apply a preset pressure to the battery 20 in the housing 10.

[0079] Specifically, the thickness and strength of the end plate 11 and the side plate 12 are designed according to the different pressures required to maintain normal operation of different batteries 20. Then, the end plate 11 and the side plate 12 are connected by welding, riveting or bolting, so that the pressure of the end plate 11 or the side plate 12 is transmitted to the internal battery 20 through the temperature transfer element 30.

[0080] The temperature transition element 30 is disposed between the battery 20 and the end plate 11 and / or between the battery 20 and the side plate 12.

[0081] like Figure 5 As shown, in one possible implementation, the housing 10 also includes a crossbeam 13. The crossbeam 13 connects between opposing end plates 11 and / or between opposing side plates 12.

[0082] Specifically, such as Figure 1 As shown, in one possible implementation, there are two end plates 11 and two side plates 12. The two end plates 11 are arranged opposite each other along the first direction X, and the two side plates 12 are arranged opposite each other along the second direction Y. The first direction X and the second direction Y intersect, thereby connecting the end plates 11 and the side plates 12 respectively.

[0083] In one possible implementation, there are at least two end plates 11 and two side plates 12.

[0084] like Figure 5As shown, the crossbeam 13 divides the housing 10 into multiple accommodating areas, and multiple batteries 20 are respectively arranged in different accommodating areas, that is, different battery modules are accommodated in different accommodating areas.

[0085] In one possible implementation, each accommodating area is provided with a temperature transition element 30.

[0086] The design of the crossbeam 13 divides the shell into different accommodating areas, which can improve the structural strength of the shell 10 and thus prevent safety problems caused by excessive pressure.

[0087] In one possible implementation, multiple batteries 20 in each accommodating area are stacked sequentially, and a temperature transition element 30 is located on the outermost side of the multiple batteries 20 in each accommodating area, thereby supporting the batteries 20.

[0088] In one possible implementation, a temperature transition element 30 is also provided between the crossbeam 13 and the battery 20.

[0089] In one possible implementation, the housing 10 may further include a partition. The partition is connected between opposing end plates 11 and / or between opposing side plates 12.

[0090] Similar to the crossbeam 13, the partition divides the housing 10 into multiple accommodating areas, with each battery 20 housed in a different accommodating area. This partition design, which divides the housing into different accommodating areas, improves the structural strength of the housing 10, thereby preventing safety issues caused by excessive pressure.

[0091] The difference lies in that the separator is located between different containment areas, meaning that the batteries 20 in different containment areas are directly separated by the separator. Therefore, the temperature transition element 30 can also be provided between the battery 20 and the separator in each containment area.

[0092] In one possible implementation, the battery pack 100 further includes an electrical connector 21. Multiple batteries 20 are arranged sequentially, and the electrical connector 21 connects adjacent batteries 20, thereby achieving electrical connection between the multiple batteries 20.

[0093] In one possible implementation, the battery pack 100 also includes a total positive battery pack 101 and a total negative battery pack 102.

[0094] Specifically, multiple batteries 20 are connected in sequence via electrical connectors 21. The positive terminal of the battery pack 101 is connected to the positive terminal of the outermost battery 20 among the multiple batteries 20 connected in the sequence, and the negative terminal of the battery pack 102 is connected to the negative terminal of the other battery 20 among the multiple batteries 20 connected in the sequence, thereby outputting the power in the battery pack 100.

[0095] In one possible implementation, the battery 20 includes a battery casing, a cover, a positive electrode, a negative electrode, and a solid electrolyte and / or a semi-solid electrolyte. The solid electrolyte and / or semi-solid electrolyte are disposed inside the battery casing, the cover is disposed on the battery casing, and the positive and negative electrodes are respectively disposed on the battery casing and in contact with the solid electrolyte and / or semi-solid electrolyte. External pressure applied to the battery 20 acts on the battery casing, thereby subjecting the solid electrolyte and / or semi-solid electrolyte inside the battery casing to force, ensuring that the positive and negative electrodes remain in contact with the solid electrolyte and / or semi-solid electrolyte, thus maintaining the battery 20 in a normal operating state.

[0096] Specifically, in one possible implementation, the temperature transfer element 30 is disposed between the housing 10 and the battery casing, and the temperature transfer element 30 is used to transfer the force of the housing 10 to the battery casing.

[0097] Preferably, the battery casing has multiple outer surfaces, and the temperature transition element 30 is opposite to the outer surface with a larger area on the battery casing, thereby improving the force transmission effect and maintaining the normal operation of the battery 20.

[0098] The battery pack 100 provided in this embodiment includes a housing 10, a battery 20, and a temperature transition element 30. The battery 20 includes a solid-state battery and / or a semi-solid-state battery. The battery 20 is disposed in the housing 10. The temperature transition element 30 is disposed in the housing 10 and is used to transmit pressure to the battery 20. The temperature transition element 30 has a preset transition temperature. When the temperature inside the housing 10 is lower than the transition temperature, the temperature transition element 30 is in a first state, used to transmit pressure to the battery 20 so that the battery 20 can work normally. When the temperature inside the housing 10 reaches the transition temperature, the temperature transition element 30 is in a second state, used to reduce the pressure transmitted to the battery 20 so that the impedance of the battery 20 increases.

[0099] By providing a temperature transition element 30 in the housing 10 of the battery pack 100, and transmitting the pressure applied to the battery 20 through the temperature transition element 30, since the battery 20 includes solid-state batteries and / or semi-solid-state batteries, the external force necessary for the solid-state battery to achieve normal electrical performance is converted into a means used for explosion prevention by utilizing the characteristics of the solid-state battery itself. In the first state below the transition temperature, the temperature transition element 30 transmits pressure to the battery 20 to maintain the normal operation of the battery 20. When the temperature reaches the transition temperature, the second state of the temperature transition element 30 reduces or stops transmitting pressure to the battery 20, increasing the impedance of the battery 20, making it unable to maintain normal operation, rapidly reducing the current in the battery 20 circuit, reducing heat generation, and achieving the purpose of temperature control. This solves the problem of thermal runaway and improves the safety factor of the battery pack 100. At the same time, different response temperatures can be designed using different temperature transition elements 30 to adapt to different batteries 20. The temperature transition element 30 is incorporated into the battery pack 100 as a normal component, eliminating the need for additional devices and reducing the installation process. The design is simple and cost-effective, requiring only the use of the temperature transition element 30. This results in minimal weight gain and reduces the impact on battery energy density and performance. Furthermore, based on the material's inherent properties, it passively responds and automatically triggers, taking effect as soon as the transition temperature is reached.

[0100] Furthermore, this application embodiment also provides an electrical device, including an electrical appliance and the aforementioned battery pack 100. The battery pack 100 is used to provide electrical energy to the electrical appliance.

[0101] The electrical equipment in this application embodiment can be a vehicle, such as a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle, and a new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. Accordingly, the electrical device can be the vehicle's drive mechanism or the vehicle's control system.

[0102] In addition, electrical equipment can also serve as other energy storage devices, such as mobile phones, portable devices, laptops, electric toys, power tools, ships, and spacecraft. Among these, spacecraft can include airplanes, rockets, space shuttles, or spacecraft.

[0103] Given that the electrical device in this embodiment includes the battery pack 100 described in any of the above embodiments, the structure and beneficial effects of the electrical device including the battery pack 100 will not be described in detail here.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that, include: A battery (20), the battery (20) comprising a solid-state battery and / or a semi-solid-state battery, the battery pack having a force-applying member for applying pressure to the battery (20); The housing (10) contains the battery (20). Temperature conversion element (30) is disposed in the housing (10), the temperature conversion element (30) is used to transmit pressure to the battery (20), and the temperature conversion element (30) has a preset conversion temperature; When the temperature inside the housing (10) is lower than the transition temperature, the temperature transition element (30) is in a first configuration for transmitting pressure to the battery (20); When the temperature inside the housing (10) reaches the transition temperature, the temperature transition element (30) is in a second form to reduce the pressure transmitted to the battery (20).

2. The battery pack according to claim 1, characterized in that, The temperature transition element (30) has high strength and high hardness in the first form to transmit pressure to the battery (20); the temperature transition element (30) has high elasticity in the second form to compress and deform, thereby reducing the pressure transmitted to the battery (20).

3. The battery pack according to claim 1, characterized in that, The temperature transition temperature of the temperature transition element (30) is 60-100℃.

4. The battery pack according to claim 1, characterized in that, The temperature transition element (30) is made of a polymer cross-linked material.

5. The battery pack according to claim 4, characterized in that, The temperature transition element (30) is made of cross-linked polycaprolactone.

6. The battery pack according to claim 1, characterized in that, The force-applying component is the housing (10), and the temperature-changing component (30) is disposed between the housing (10) and the battery (20).

7. The battery pack according to claim 6, characterized in that, The housing (10) includes an end plate (11) and / or a side plate (12), and the temperature changer (30) is disposed between the battery (20) and the end plate (11) and / or between the battery (20) and the side plate (12).

8. The battery pack according to claim 7, characterized in that, There are at least two end plates (11) and / or at least two side plates (12), with at least two end plates (11) arranged opposite each other along a second direction and / or at least two side plates (12) arranged opposite each other along a first direction, the first direction and the second direction intersecting.

9. The battery pack according to any one of claims 1-8, characterized in that, The housing (10) also includes a crossbeam (13), which divides the housing (10) into multiple accommodating areas. Multiple batteries (20) are respectively disposed in different accommodating areas. The temperature transition element (30) is provided between the crossbeam (13) and the batteries (20).

10. The battery pack according to any one of claims 1-7, characterized in that, The temperature transition element (30) includes at least two, and the at least two temperature transition elements (30) are respectively disposed on opposite sides of the battery (20).

11. The battery pack according to any one of claims 1-7, characterized in that, The battery (20) includes multiple batteries, which are arranged in sequence, and the temperature conversion element (30) is located on the side of the outermost battery (20) away from the other batteries (20).

12. The battery pack according to any one of claims 1-7, characterized in that, The battery (20) includes a plurality of batteries, and the battery pack (100) also includes an electrical connector (21) connected between adjacent batteries (20).

13. An electrical appliance, characterized in that, It includes an electrical device and a battery pack (100) as described in any one of claims 1-12, the battery pack being used to provide electrical power to the electrical device.

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