Battery pack, electrical equipment and energy storage device

Abstract

The present application provides a battery pack, electrical equipment, and energy storage device, belonging to the field of batteries. The battery pack includes a battery cell group and a cable tie. The battery cell group includes a plurality of battery cells arranged in sequence. The cable tie is mounted on the periphery of the battery cell group to bundle and secure the battery cell group. The cable tie includes a belt body, a mounting member, and an alarm element mounted on the mounting member. The belt body has a first end and a second end along the circumference of the battery cell group. The first end and the second end are connected to the mounting member to form an annular structure. The alarm element is configured to emit an alarm signal when the deformation of the circumference of the annular structure reaches a limit deformation. During operation of the battery pack, when the battery cell group expands to the point where the deformation of the circumference of the annular structure reaches a limit deformation, the alarm element emits an alarm signal to alert the user, allowing the user to take countermeasures before the belt body breaks. This helps to reduce or even eliminate the damage to the battery pack caused by the belt body breaking, and has a positive effect on improving the safety of the battery pack.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack, electrical equipment, and energy storage device. Background Art

[0002] Against the backdrop of global advocacy for energy conservation and environmental protection, advancements in battery technology are crucial to promoting sustainable development. Batteries, as a bridge between energy storage and conversion, have become a core factor driving continued progress in both electric vehicles and energy storage.

[0003] When stacking battery cells together to form a battery pack, they are secured in place with a steel strap before further assembly. However, during charging and discharging, the battery cells expand, increasing their volume and stress on the steel strap, impacting the safety of the battery pack. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems in the background art. To this end, one purpose of this application is to provide a battery pack, electrical equipment, and energy storage device that can issue an alarm signal to alert the user before the cable tie breaks, thereby reducing or even eliminating the damage to the battery pack caused by the cable tie breaking, and having a positive effect on the safety of the battery pack.

[0005] An embodiment of the first aspect of the present application provides a battery pack, comprising: a battery cell group and a cable tie, the battery cell group comprising a plurality of battery cells arranged in sequence; the cable tie is sleeved on the outer circumference of the battery cell group, and the battery cell group is fixed by bundling with the cable tie; the cable tie comprises a belt body, a mounting piece, and an alarm element arranged on the mounting piece, the belt body having a first end and a second end along the circumference of the battery cell group, the first end and the second end being connected to the mounting piece to form an annular structure, and the alarm element being configured to emit an alarm signal when the deformation of the circumference of the annular structure reaches a limit deformation.

[0006] In the technical solution of the embodiments of this application, a cable tie is designed to include a strap body and a mounting member. The strap body's ends are connected to the mounting member to form a ring structure that fits around the perimeter of a battery pack. The mounting member is also equipped with an alarm element. During actual use of the battery pack, when the battery pack expands to the point where the annular structure's circumference reaches its limit, the alarm element emits an alarm signal. This alerts the user before the strap breaks, allowing them to take countermeasures before the strap breaks. This helps mitigate or even eliminate damage to the battery pack caused by a strap break, positively improving the safety of the battery pack.

[0007] In some embodiments, the battery pack further comprises a box, wherein the battery cell group and the cable tie are housed in the box; the cable tie further comprises a distance measuring element, which is disposed on the mounting member and faces a reference wall of the box; when the normal distance between the distance measuring element and the reference wall reaches a threshold, the deformation of the length of the cable tie reaches a maximum deformation; the distance measuring element is used to measure the normal distance;

[0008] The cable tie is configured so that the second end cannot move relative to the mounting member after the deformation of the length of the cable tie reaches the maximum deformation, and the ranging element is used as an alarm element. The ranging element sends an alarm signal when the detected normal distance reaches a threshold value. Alternatively, the cable tie is configured so that the second end can move relative to the mounting member after the deformation of the length of the cable tie reaches the maximum deformation, and the ranging element is configured to be electrically connected to the battery management system of the battery pack. When the detected normal distance reaches the threshold value, the ranging element generates a warning signal and sends it to the battery management system. The warning signal is used to instruct the battery management system to perform a warning operation.

[0009] In the technical solution where the second end of the belt cannot move relative to the mounting member after the belt's length deformation reaches its maximum deformation, the distance-measuring element can be used to both detect normal distance and trigger an alarm, eliminating the need for a separate alarm element. In the technical solution where the second end of the belt can move relative to the mounting member after the belt's length deformation reaches its maximum deformation, a warning is issued before the alarm, allowing the user more time to respond.

[0010] In some embodiments, the first end and the second end are fixedly connected to the mounting member, so that the cable tie can be configured such that the second end cannot move relative to the mounting member after the deformation of the length of the strap reaches a maximum deformation.

[0011] In some embodiments, the mounting member is constructed to have a cavity inside, with one end of the mounting member being closed and the other end being provided with a through hole; the first end is fixedly connected to one end of the mounting member; the second end passes through the through hole into the cavity and is connected to the mounting member, and the second end includes a first section accommodated in the cavity; the connection between the second end and the mounting member can be released, and after the deformation of the length of the belt body reaches the maximum deformation and the connection between the second end and the mounting member is released, the second end can move relative to the mounting member so that at least part of the first section moves out of the cavity.

[0012] In this embodiment, the first section of the belt body is accommodated in the cavity of the mounting member. After the connection between the second end and the mounting member is released, the first section can participate in the change of the circumference of the annular structure, so that during the period from the early warning to the issuance of the alarm signal, the annular structure can adapt to the expansion of the battery cell group without causing the belt body to break.

[0013] In some embodiments, the mounting member includes a first plate and a second plate arranged opposite to each other, a through hole is arranged on the first plate, the first end is fixedly connected to a side of the second plate facing away from the first plate, and the second end is connected to a side of the second plate facing the first plate through a quick-release structure, and the quick-release structure releases the connection between the second end and the mounting member under the tension generated by the stretching of the belt body.

[0014] This embodiment uses a quick-release structure to connect and release the second end from the mounting member, which is simple and reliable. The quick-release structure can automatically release the connection between the second end and the mounting member, thereby reducing dependence on manual labor.

[0015] In some embodiments, a latch hole is provided on one of the second end and the mounting piece, and a locking portion is connected to the other, the center line of the latch hole is parallel to the axial direction of the annular structure, and the locking portion has a locked state and an unlocked state; in the locked state, the locking portion engages with the latch hole to prevent the second end from moving relative to the mounting piece; in the unlocked state, the locking portion disengages from the latch hole, and the second end can move relative to the mounting piece; when the deformation of the length of the belt body reaches the maximum deformation and the normal distance detected by the ranging element reaches a threshold, the locking portion can be switched from the locked state to the unlocked state under the action of force.

[0016] Compared with the quick-release structure, the locking portion used in this embodiment is reliably engaged with the locking hole in the locked state, which can reduce the possibility of accidental movement of the second end due to the tension generated by the stretching deformation of the belt body, so as to reliably restrain the battery cell pack.

[0017] In some embodiments, the card hole is provided on the mounting member, and the locking portion is configured to be compressible and fixedly connected to the second end; the cable tie also includes a pressure piece opposite to the card hole, the pressure piece is connected to the mounting member and can move relative to the mounting member under the action of an external force, so that the pressure piece switches between a first position and a second position along the axial direction of the card hole. During the movement of the pressure piece from the first position to the second position, a force is applied to the locking portion, so that the locking portion is compressed and deformed to disengage from the card hole.

[0018] This embodiment introduces a pressure piece, which can conveniently apply force to the locking portion through the pressure piece.

[0019] In some embodiments, the cable tie also includes a base and a first spring located outside the cavity, the base is set on the mounting member, the first spring is arranged outside the pressure member, one end of the first spring is fixedly connected to one of the base and the mounting member, and the other end is connected to the pressure member, and the first spring is used to maintain the pressure member in the first position in a natural state.

[0020] This embodiment introduces a first spring to enable the pressure member to move between the first position and the second position relative to the mounting member and to remain in the first position.

[0021] In some embodiments, the cable tie further comprises a base disposed on the mounting member and located outside the cavity, the distance measuring element is disposed on the base, and the base provides a mounting and fixing foundation for the distance measuring element.

[0022] In some embodiments, the alarm element is an alarm button disposed in the cavity; when the deformation of the circumference of the annular structure reaches a limit deformation, the locking portion connected to the second end presses against the alarm button.

[0023] This embodiment utilizes the physical contact relationship between the locking portion and the alarm button to trigger the alarm signal. This method of triggering the alarm is less affected by external interference and program errors and has high reliability.

[0024] In some embodiments, the cable tie also includes a stop portion and an elastic member located in the cavity, the second end is connected to the stop portion, and the projection of the stop portion at the other end of the mounting member along the axial direction of the through hole has a non-overlapping area with the through hole; the two ends of the elastic member are respectively connected to the stop portion and the other end of the mounting member where the through hole is opened, and when the second end is separated from the mounting member, the stop portion moves relative to the mounting member and squeezes the elastic member.

[0025] In this embodiment, an elastic member is introduced. When the second end moves relative to the mounting member, it drives the stop portion to move and squeezes the elastic member. The elastic member is deformed, so that the stop portion needs to overcome the elastic force generated by the deformation of the elastic member during the process of moving toward the through hole. This prevents the first section from instantly moving out of the cavity under the action of the expansion force, so that the degree of change in the circumference of the annular structure can match the degree of expansion of the battery cell group.

[0026] In some embodiments, the box body has an inner cavity, and the box body also includes a partition arranged in the inner cavity and opposite to the reference wall surface, the partition divides the inner cavity into a first chamber and a second chamber, the battery management system is accommodated in the first chamber, all battery cell groups are accommodated in the second chamber and are against the partition, and the cable tie is located above the partition.

[0027] In this embodiment, the battery cell group and the battery management system are housed in different compartments, which can electrically isolate the high-voltage part from the low-voltage part, helping to reduce the risk of safety problems caused by short circuits.

[0028] In some embodiments, an insulating layer is provided on the inner surface of the strip facing the outer periphery of the battery pack. The insulating layer is used to insulate and isolate the battery pack from the strip. This helps reduce the risk of electrical connection between the battery pack and the strip, thereby improving the electrical safety of the battery pack.

[0029] An embodiment of the second aspect of the present application provides an electrical device, which includes a battery pack according to any embodiment of the first aspect of the present application, and the battery pack is used to provide electrical energy.

[0030] An embodiment of the third aspect of the present application provides an energy storage device, which includes a battery pack according to any embodiment of the first aspect of the present application, and the battery pack is used to provide electrical energy.

[0031] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0033] Figure 1 A schematic structural diagram of a vehicle according to some embodiments of the present application;

[0034] Figure 2 This is a schematic structural diagram of a battery pack according to some embodiments of the present application;

[0035] Figure 3 A schematic top view of a battery pack according to some embodiments of the present application;

[0036] Figure 4 This is a schematic structural diagram of a cable tie according to some embodiments of the present application;

[0037] Figure 5 Schematic diagram of a partial cross section of cable ties according to some other embodiments of the present application;

[0038] Figure 6 This is a schematic diagram of the working process of the cable tie in some embodiments of the present application;

[0039] Figure 7 Schematic diagram of partial cross-sections of cable ties according to other embodiments of the present application;

[0040] Figure 8 Schematic diagram of a partial cross section of cable ties according to some further embodiments of the present application.

[0041] Description of reference numerals:

[0042] Vehicles 1000;

[0043] Battery pack 100, controller 200, motor 300;

[0044] Battery cell pack 10, battery cell 11, cable tie 12, strap body 121, stopper 1211, mounting member 122, cavity 1221, first plate 1222, second plate 1223, alarm button 123, ranging element 124, quick-release structure 125, latch hole 126, locking portion 127, operating portion 1271, connecting portion 1272, rod 1273, base 128, pressure member 1281, first spring 1282, first wall 1283, second wall 1284, elastic member 129, second spring 1291;

[0045] Box body 20, first box body 21, second box body 22, first side wall 23, second side wall 24, partition 25;

[0046] Battery management system 30 , low voltage wiring harness 31 . DETAILED DESCRIPTION

[0047] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0049] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0050] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0051] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0052] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0053] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0054] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements.

[0055] In this application, the term "parallel" includes not only the absolutely parallel case, but also the generally parallel case as commonly understood in engineering. Meanwhile, "perpendicular" also includes not only the absolutely perpendicular case, but also the generally perpendicular case as commonly understood in engineering. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on specific circumstances.

[0056] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0057] To prevent battery cells from swaying within the battery pack casing, steel strapping is typically used to secure multiple cells arranged in a row. However, during the charge and discharge process, the battery cells continuously expand and expand, causing the cells to expand apart, gradually tightening the steel strapping. When the stress limit of the steel strapping is exceeded, it will break, and the steel strapping will lose its ability to restrain the row of battery cells. This can cause problems such as battery cell swaying and short circuits (broken steel strapping can overlap the high-voltage electrical components of the battery pack, causing electrical connections between the components). Due to the high rigidity of the steel strapping, a broken steel strapping can also pierce the battery cells, seriously affecting battery safety.

[0058] To address this issue, some related technologies replace part of the steel belt with an elastic belt. Specifically, the cable tie used to bundle a row of battery cells includes two first connecting belts and two second connecting belts, and the first connecting belt and the second connecting belt are alternately arranged along their own length direction and connected to form an annular belt, wherein the first connecting belt is made of a rigid material, and the second connecting belt is an elastic belt that can be elastically deformed along its own length direction. In this way, the elastic deformation ability of the elastic belt is utilized to make the elastic belt adapt to the expansion of a row of battery cells. Although this method can reduce the possibility of the cable tie breaking by introducing an elastic belt, the bundling effect of the cable tie is not as good as the bundling effect of the steel belt. This is because the first connecting belt made of a rigid material has a higher rigidity, while the elastic belt material has a lower rigidity, and the binding force of the cable tie on a row of battery cells is unevenly distributed, resulting in the cable tie not being securely bundled.

[0059] Based on the above considerations, a battery pack, electrical equipment, and energy storage device were designed. The cable tie used in the battery pack includes a strap and a mounting member. The strap and mounting member are connected to form a ring-shaped structure, and the battery cell group is secured by the ring-shaped structure. The cable tie is also designed to include an alarm element mounted on the mounting member. When the deformation of the circumference of the ring structure reaches a limit, the alarm element emits an alarm signal. This alarm signal allows the user to promptly detect that the battery cell group has expanded to the length of the strap and has reached the maximum deformation. By promptly repairing or replacing the expanded battery cell group, the safety hazard of the strap breaking and piercing the battery cell is eliminated. Therefore, in such a battery pack, notifying the user by issuing an alarm signal before the strap breaks, prompting a timely response, is a preventative measure that helps mitigate losses caused by the strap breaking.

[0060] Moreover, in such a battery pack, the belt body and the mounting member are not made of elastic material, the annular structure does not sacrifice too much rigidity, and the annular structure binds the battery cell group more firmly.

[0061] In a first aspect, the present application provides a battery pack that can be used, but is not limited to, in electrical equipment, energy storage devices, and the like. A battery pack comprising the present application can be used to form a power supply system for the electrical equipment. A battery pack comprising the present application can also be used to form a power supply system for the energy storage device.

[0062] The energy storage device using a battery pack as a power supply system in the embodiment of the present application can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. The energy storage device can store electrical energy as needed and output electrical energy at the appropriate time. For example, the energy storage device can store electrical energy during low electricity consumption and provide electrical energy to relevant users or electrical equipment during peak electricity consumption. The energy storage device provided in the embodiment of the present application can be any power system that requires an energy storage device.

[0063] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0064] In some embodiments, an energy storage device may include a cabinet and one or more battery clusters housed within the cabinet. A battery cluster may include multiple battery packs connected in series via a busbar to increase the voltage of the energy storage device. When an energy storage device includes multiple battery clusters, the battery clusters are connected in parallel to increase the device's capacity.

[0065] In the embodiments of the present application, the electrical devices that utilize the battery pack as a power source may include, but are not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, electric vehicles, ships, spacecraft, and the like. Electric toys may include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, and spacecraft may include airplanes, rockets, space shuttles, and spacecraft. For the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0066] Please refer to Figure 1 , Figure 1 The structural diagram of the vehicle 1000 of some embodiments of the present application is schematically shown. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery pack 100 is provided inside the vehicle 1000, and the battery pack 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery pack 100 can be used to power the vehicle 1000. For example, the battery pack 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery pack 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0067] In some embodiments of the present application, the battery pack 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0068] Figure 2 The structure diagram of the battery pack 100 of some embodiments of the present application is schematically shown. Figure 2 As shown, the battery pack 100 (Battery Pack) mentioned in the embodiment of the present application may include one or more battery cell groups 10 (Battery Module) for providing voltage and capacity. The battery cell group 10 may include a plurality of battery cells 11 (Battery Cell) arranged in sequence, and the plurality of battery cells 11 are connected in series, in parallel, or in parallel through a busbar component. Parallel connection means that the plurality of battery cells 11 are connected in both series and in parallel. As an example, the battery pack 100 may include a plurality of battery cell groups 10, and the plurality of battery cell groups 10 are arranged in sequence, and the arrangement direction of the plurality of battery cell groups 10 is perpendicular to the arrangement direction of the plurality of battery cells 11 in the battery cell group 10.

[0069] The battery cell 11 may be a secondary battery, which refers to a battery cell 11 that can be used continuously by activating the active material by charging after the battery cell 11 is discharged. The battery cell 11 may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, or the like, and the embodiments of the present application are not limited thereto. As an example, the battery cell 11 may be a cylindrical battery cell, a prismatic battery cell, or a battery cell 11 of another shape. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal prismatic battery cells. Polygonal prismatic battery cells are, for example, hexagonal prismatic battery cells, and the like, and the present application has no particular limitations thereto.

[0070] Figure 3 Schematically shows a top view of a battery pack according to some embodiments of the present application. Figure 4 The schematic diagram of the structure of the cable tie of some embodiments of the present application is shown schematically. Figure 3 and Figure 4The battery pack 100 of the embodiment of the present application further includes a cable tie 12, which is sleeved around the outer periphery of the battery cell group 10, and the battery cell group 10 is tied and secured by the cable tie 12. The cable tie 12 includes a strap body 121, a mounting member 122, and an alarm element disposed on the mounting member 122. The strap body 121 has a first end and a second end along the circumference of the battery cell group 10. The first end and the second end are respectively connected to the ends of the mounting member 122 to form an annular structure. The alarm element is configured to emit an alarm signal when the deformation of the circumference of the annular structure reaches a limit deformation.

[0071] The material of the belt body 121 and the material of the mounting member 122 may include one or more rigid materials such as aluminum alloy, titanium alloy, stainless steel, etc. The belt body 121 is an integral part, and the mounting member 122 provides an installation base for the alarm element. The belt body 121 and the mounting member 122 are connected to form an annular structure, and the annular structure surrounds the periphery of the battery cell group 10 to achieve bundling and fixation of the battery cell group 10. The belt body 121 and the mounting member 122 are both in contact with the outer peripheral surface of the battery cell group 10. The number of cable ties 12 is the same as the number of battery cell groups 10, and this application does not make any specific restrictions on this. For example, Figure 3 As shown, three battery cell groups 10 are provided, and three cable ties 12 are provided accordingly.

[0072] It can be understood that when the circumference of the annular structure reaches its limit deformation, it indicates that the expansion force on the strip 121 has reached its maximum stress and the deformation of the strip 121 has reached its maximum length. If the deformation of the strip 121 exceeds the maximum deformation, the expansion force exerted on the strip 121 by the battery cells 11 continues to increase, and the strip 121 may break.

[0073] During the charge and discharge process of the battery pack 100 of this embodiment, the battery cells 11 continuously produce gas and expand, increasing the volume of the battery pack 10. This exerts an expansion force on the band 121 and mounting member 122. Under this expansion force, the band 121 gradually stretches and deforms to accommodate the expansion of the battery pack 10, gradually increasing the circumference of the annular structure. When the battery pack 10 expands to the point where the deformation of the annular structure reaches its limit, the alarm component issues an alarm signal, prompting the user to promptly repair or replace the expanded battery pack 10.

[0074] In the battery pack 100 of this embodiment, the cable tie 12 is designed to include a strap 121 and a mounting member 122. The ends of the strap 121 connect to the mounting member 122 to form a ring structure that fits around the perimeter of the battery cell pack 10. The mounting member 122 is also equipped with an alarm element. During use, when the battery cell pack 100 expands to the point where the deformation of the ring structure reaches its limit, the alarm element emits an alarm signal. This alerts the user before the strap 121 breaks, allowing them to take countermeasures before the strap 121 breaks. This helps mitigate or even eliminate damage to the battery pack 100 caused by the strap 121 breaking (e.g., the strap 121 piercing the battery cell 11 after breaking), positively enhancing the safety of the battery pack 100.

[0075] Moreover, the alarm element in this embodiment can automatically trigger an alarm, has a high degree of intelligence, and reduces dependence on manual inspection, which can help improve user experience.

[0076] In addition, compared with the technical solution in which part of the cable tie 12 is an elastic band, the material of the annular structure composed of the band body 121 and the mounting member 122 in this embodiment has higher rigidity, so the binding force of the annular structure on the battery cell group 10 is evenly distributed, and the battery cell group 10 can be securely bound through the annular structure.

[0077] According to some embodiments of the present application, Figure 2 and Figure 3 As shown, the battery pack 100 may further include a housing 20, within which the battery cell group 10 and cable tie 12 are housed. The cable tie 12 may further include a distance measuring element 124, which is disposed on the mounting member 122 and faces a reference wall of the housing 20. When the normal distance between the distance measuring element 124 and the reference wall reaches a threshold, the deformation of the length of the strap 121 reaches a maximum deformation. The distance measuring element 124 is used to measure the normal distance.

[0078] In some embodiments, the housing 20 may be a simple three-dimensional structure such as a single rectangular parallelepiped, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as rectangular parallelepiped, cylinder, or sphere. The housing 20 may be made of an alloy material such as aluminum alloy or iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0079] Among them, multiple battery cells 11 can be directly connected in series, parallel or mixed together to form a battery cell group 10, and then the battery cell group 10 is accommodated in the box 20; of course, the battery cell group 10 can also be a battery module formed by multiple battery cells 11 connected in series, parallel or mixed together, and the multiple battery modules are then connected in series, parallel or mixed together to form a whole and accommodated in the box 20.

[0080] As an example, the box body 20 may include a first box body 21 and a second box body 22. The first box body 21 and the second box body 22 are buckled together to form a closed space inside the box body 20 to accommodate the battery cell group 10 and the cable tie 12. The closed here means covering or closing, which can be non-sealed or sealed to prevent liquid or other foreign matter from affecting the charging or discharging of the battery cell 11. The first box body 21 may be a top cover or a bottom plate. As an example, the box body 20 may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box body 20. In some embodiments, the box body 20 may serve as part of the chassis structure of the vehicle 1000. For example, part of the box body 20 may become at least a part of the floor of the vehicle 1000, or part of the box body 20 may become at least a part of the crossbeam and longitudinal beam of the vehicle 1000.

[0081] The reference wall surface can be a side wall surface of the housing 20 or a wall surface of another component within the housing 20 (e.g., a crossbeam or longitudinal beam). For example, along the arrangement direction of the battery cells 11 of the battery pack 10, the housing 20 has a first side wall surface 23 and a second side wall surface 24 that oppose each other. The reference wall surface can be either the first side wall surface 23 or the second side wall surface 24. In the battery pack 100 disclosed herein, the ranging element 124 can be implemented using either an infrared laser ranging sensor or an ultrasonic ranging sensor.

[0082] Figure 5 Schematically shows a partial cross-sectional view of the cable tie 12 of some other embodiments of the present application. In some embodiments, as Figure 5 As shown, the cable tie 12 can be configured such that after the deformation of the length of the strap body 121 reaches the maximum deformation δ, the second end cannot move relative to the mounting member 122. In this example, the distance measuring element 124 can be configured to function as an alarm element, which issues an alarm signal when the detected normal distance reaches a threshold.

[0083] In the embodiment of the present application, there are various ways to achieve that the second end of the belt body 121 cannot move relative to the mounting member 122 after the deformation of the length of the belt body 121 reaches the maximum deformation δ.

[0084] According to some embodiments of the present application, the first end and the second end can be fixedly connected to the mounting member 122 so that the cable tie 12 can be configured so that the second end cannot move relative to the mounting member 122 after the deformation of the length of the strap body 121 reaches the maximum deformation δ.

[0085] Among them, the connection between the first end and the mounting member 122 and the connection between the second end and the mounting member 122 can be achieved by one or more of welding connection technology, screw connection technology, and adhesive connection technology, so that the first end and the second end cannot move relative to the mounting member 122.

[0086] As an alternative embodiment, Figure 5 As shown, the mounting member 122 can be constructed to have a cavity 1221 therein. The cable tie 12 can also include a stopper 1211 located within the cavity 1221. The mounting member 122 is provided with a through hole, through which the second end passes into the cavity 1221 and connects to the stopper 1211. The projection of the stopper 1211 along the axial direction of the through hole at the other end of the mounting member 122 does not overlap with the through hole. This prevents the stopper 1211 from passing through the through hole, preventing the second end from moving relative to the mounting member 122. In this example, the stopper 1211 can also be fixedly connected to the mounting member 122.

[0087] Taking the first sidewall 23 as the reference wall, and the first sidewall 23 being closer to the distance measuring element 124 than the second sidewall 24, as an example, in the initial state of the battery pack 100 of this embodiment, the length of the strip 121 is L0, the normal distance is D0, and the circumference of the ring structure is P0. During the charge and discharge process of the battery pack 100, the battery cell group 10 expands, the length of the strip 121 and the circumference of the ring structure gradually increase, the distance measuring element 124 gradually approaches the first sidewall 23, and the normal distance gradually decreases. When the distance measuring element 124 detects that the normal distance decreases to a threshold value, indicating that the deformation of the strip 121 has reached the maximum deformation δ and the deformation of the circumference of the ring structure has reached the limit deformation ε, the length of the strip 121 is L0 + δ, and the circumference of the ring structure is P0 + ε, the distance measuring element 124 issues an alarm signal.

[0088] In this embodiment, the distance measuring element 124 can be used to detect the normal distance, so as to judge whether the deformation of the length of the belt body 121 has reached the maximum deformation according to the relationship between the normal distance and the threshold, and can also be used to trigger an alarm, so there is no need to set up an additional alarm element.

[0089] Figure 6 The working process of the cable tie 12 in some embodiments of the present application is schematically shown. Figure 7 Schematically shows a partial cross-sectional view of a cable tie 12 according to some other embodiments of the present application. Figure 8Schematically shows a partial cross-sectional view of the cable tie 12 of some other embodiments of the present application. In some embodiments, as Figures 6 to 8 As shown, the cable tie 12 can be configured so that after the deformation of the length of the strap body 121 reaches the maximum deformation, the second end can still move relative to the mounting member 122. In this example, the distance measuring element 124 can be configured to be electrically connected to the battery management system 30 of the battery pack 100. When the detected normal distance reaches a threshold, the distance measuring element 124 generates a warning signal and sends it to the battery management system 30. The warning signal is used to instruct the battery management system 30 to perform a warning operation.

[0090] Among them, the battery management system 30 performs the warning operation specifically by sending a warning message to the electrical equipment or energy storage device equipped with the battery pack 100, so that at least one of the central control screen, speaker, and indicator light of the electrical equipment or energy storage device equipped with the battery pack 100 sends a warning message, or it can send a warning message to the server so that the user can also promptly understand the deformation of the belt body 121 through the remote server.

[0091] Taking the first sidewall 23 as the reference wall, and the first sidewall 23 being closer to the distance measuring element 124 than the second sidewall 24, as an example, in the initial state of the battery pack 100 of this embodiment, the length of the strip 121 is L0, the normal distance is D0, and the circumference of the ring structure is P0. During the charge and discharge process of the battery pack 100, the battery cell group 10 expands, the length of the strip 121 and the circumference of the ring structure gradually increase, the distance measuring element 124 gradually approaches the first sidewall 23, and the normal distance gradually decreases. When the distance measuring element 124 detects that the normal distance has decreased to a threshold value, indicating that the deformation of the strip 121 has reached the maximum deformation δ, the length of the strip 121 is correspondingly L0 + δ, the distance measuring element 124 generates a warning signal and transmits it to the battery management system 30. In response to the warning signal, the battery management system 30 executes a warning operation. When the battery cell group 10 continues to expand, the second end moves relative to the mounting member 122 under the action of the expansion force. During this process, the length of the belt body 121 no longer changes, and the circumference of the annular structure continues to increase. Until the second end can no longer move relative to the mounting member 122, the deformation of the circumference of the annular structure reaches the limit deformation ε, and the circumference of the annular structure corresponds to P0+ε, and the alarm component sends an alarm signal.

[0092] In this embodiment, when the normal distance detected by the distance-measuring element 124 reaches a threshold, a warning signal is sent to the battery management system 30. This allows an alarm to be issued to notify the user when the deformation of the length of the strip 121 reaches its maximum value. Subsequently, the continued expansion of the battery cell pack 10 increases the force on the annular structure, causing the second end to move relative to the mounting member 122, allowing the annular structure to adapt to the expansion of the battery cell pack 10. Thus, in such a battery pack 100, when the deformation of the length of the strip 121 reaches its maximum value, the battery management system 30 performs a warning operation to notify the user, i.e., issuing a warning before issuing an alarm. Because the deformation of the circumference of the annular structure has not yet reached the limit, this allows the user more time to respond, minimizing the risk of strip 121 fracture and minimizing the damage to the battery pack 100 caused by a strip 121 fracture.

[0093] According to some embodiments of this application, please continue to refer to Figures 6 to 8 Specifically, the mounting member 122 can be constructed to have a cavity 1221 therein, with one end of the mounting member 122 being closed and the other end having a through-hole. The first end is fixedly connected to one end of the mounting member 122, while the second end passes through the through-hole into the cavity 1221 and is connected to the mounting member 122. The second end includes a first segment housed within the cavity 1221. Furthermore, the connection between the second end and the mounting member 122 is releasable. After the deformation of the length of the belt body 121 reaches a maximum deformation δ and the connection between the second end and the mounting member 122 is released, the second end can move relative to the mounting member 122, allowing at least a portion of the first segment to move out of the cavity 1221.

[0094] The mounting member 122 may be configured as a box, a frame, a “П” shape, or other structures, which are not specifically limited in this embodiment.

[0095] In the initial state of the battery pack 100 of this embodiment, the second end is connected to the mounting member 122, and the first segment is located within the cavity 1221. During the charge and discharge process of the battery pack 100, the battery cell assembly 10 expands, and the length of the band 121 and the circumference of the annular structure gradually increase. During this process, the first segment remains within the cavity 1221. When the deformation of the length of the band 121 reaches the maximum deformation δ, the connection between the second end and the mounting member 122 is released. Thereafter, the continued expansion of the battery cell assembly 10 increases the force on the annular structure, causing the second end to move relative to the mounting member 122, driving the first segment to gradually move out of the cavity 1221. That is to say, this embodiment utilizes the relationship between the second end and the mounting member 122. In the early stage of expansion of the battery cell group 10, the circumference of the annular structure increases as the belt body 121 is stretched and deformed to adapt to the expansion of the battery cell group 10. After the deformation of the length of the belt body 121 reaches the maximum deformation δ, the connection between the second end and the mounting member 122 is released, the second end can move, and the circumference of the annular structure increases as the first section is released to adapt to the expansion of the battery cell group 10.

[0096] In this embodiment, the first section of the belt body 121 is accommodated in the cavity 1221 of the mounting member 122. After the deformation of the length of the belt body 121 reaches the maximum deformation δ, the second end is released from the connection with the mounting member 122, and the second end is movable, and the first section gradually moves out of the cavity 1221 to participate in the change in the circumference of the annular structure. Therefore, during the period from the battery management system 30 executing the early warning operation to the alarm element sending the alarm signal, the annular structure can adapt to the expansion of the battery cell group 10 without causing the belt body 121 to break.

[0097] It is understandable that there are various specific implementations of the second end and the mounting member 122 being connectable and releasable in this document.

[0098] According to some embodiments of this application, please continue to refer to Figure 8 The mounting member 122 may specifically include a first plate 1222 and a second plate 1223 arranged opposite to each other, the through hole being arranged on the first plate 1222, the first end being fixedly connected to a side of the second plate 1223 facing away from the first plate 1222, and the second end being connected to a side of the second plate 1223 facing the first plate 1222 through a quick-release structure 125, and the quick-release structure 125 releases the connection between the second end and the mounting member 122 under the tension generated by the stretching of the belt body 121.

[0099] The quick-release structure 125 can be implemented using one or a combination of a snap-on structure, a magnetic structure, Velcro, a plug-in connection, or a fastener connection. For example, if the quick-release structure 125 is a magnetic structure, during the charge and discharge process of the battery pack 100, the expansion of the battery cell group 10 will apply an expansion force to the annular structure. Under this expansion force, the belt body 121 will stretch and deform. When the tension generated by the stretching of the belt body 121 exceeds the magnetic attraction of the magnetic structure, the connection between the second end and the mounting member 122 is released.

[0100] This embodiment utilizes a quick-release mechanism 125 to connect and disconnect the second end from the mounting member 122, which is simple and reliable. Furthermore, under the tensile force generated by the extension of the strap 121, the quick-release mechanism 125 automatically disconnects the second end from the mounting member 122. This not only reduces reliance on manual labor but also provides a timely response, thereby reducing the risk of breakage of the strap 121 due to delayed release.

[0101] According to some embodiments of the present application, Figure 6 As shown, the second end may be connected to a locking portion 127, and the mounting member 122 may be provided with a locking hole 126. According to some embodiments of the present application, such as Figure 7 As shown, the second end may be provided with a locking hole 126 , and the mounting member 122 may be connected to a locking portion 127 .

[0102] In summary, one of the mounting member 122 and the second end may be provided with a latching hole 126, and the other may be connected to a locking portion 127. The centerline of the latching hole 126 is parallel to the axial direction of the annular structure. The locking portion 127 can have a locked state and an unlocked state. When the normal distance detected by the distance-measuring element 124 reaches a threshold (i.e., the deformation of the length of the strap 121 reaches a maximum deformation δ), the locking portion 127 can be switched from the locked state to the unlocked state under the action of a force. In the locked state, the locking portion 127 engages with the latching hole 126, preventing the second end from moving relative to the mounting member 122. In the unlocked state, the locking portion 127 disengages from the latching hole 126, allowing the second end to move relative to the mounting member 122.

[0103] Compared with the quick-release structure 125 , the locking portion 127 used in this embodiment reliably engages with the locking hole 126 in the locked state, thereby reducing the possibility of accidental movement of the second end due to the tension generated by the stretching deformation of the belt body 121 , thereby reliably restraining the battery cell group 10 .

[0104] exist Figure 7In the illustrated example, the locking portion 127 can be specifically connected to the mounting member 122, and the locking hole 126 is correspondingly provided at the second end. The locking portion 127 can be configured in a spherical, hemispherical, cylindrical, or semi-cylindrical shape. The mounting member 122 is provided with an opening, which is opposite to the locking hole 126. The locking hole 126 is a blind hole, and the shape of the opening matches the shape of the locking portion 127. An operating portion 1271 is provided outside the inner cavity of the mounting member 122. The operating portion 1271 is connected to the locking portion 127 via a connecting portion 1272 and a rod 1273 in sequence. The connecting portion 1272 is detachably connected to the opening. Among them, the connecting part 1272 and the opening can be engaged or disengaged. In this example, the acting force can be a pulling force, and the operating part 1271 is pulled to drive the connecting part 1272 to disengage from the opening; of course, in other embodiments of the present application, the connecting part 1272 and the opening can also be threadedly connected. In this example, the acting force can be a rotational force, and the operating part 1271 is rotated to drive the connecting part 1272 to be screwed out of the opening.

[0105] During the charge and discharge process of the battery pack 100 of this embodiment, the expansion of the battery cell group 10 exerts an expansion force on the annular structure. This expansion force causes the belt body 121 to stretch and deform. When the deformation of the length of the belt body 121 reaches the maximum deformation δ, the distance measuring element 124 detects that the normal distance has reached a threshold value and generates a warning signal to the battery management system 30. In response to receiving the warning signal, the battery management system 30 executes a warning operation to notify the user. The user applies force to the operating portion 1271, causing the locking portion 127 to withdraw from the locking hole 126. Subsequently, as the battery cell group 10 continues to expand, the second end can move relative to the mounting member 122 under the action of the expansion force.

[0106] exist Figure 6 In the illustrated example, the locking hole 126 can be provided on the mounting member 122, and the locking portion 127 can be configured to be compressible and fixedly connected to the second end. The cable tie 12 can also include a pressure member 1281 opposite the locking hole 126. The pressure member 1281 is connected to the mounting member 122 and can move relative to the mounting member 122 under the action of an external force, so that the pressure member 1281 can switch between a first position and a second position along the axial direction of the locking hole 126. During the movement of the pressure member 1281 from the first position to the second position, the pressure member 1281 applies a force to the locking portion 127, causing the locking portion 127 to compress and deform, thereby disengaging from the locking hole 126.

[0107] In which, the cable tie 12 also includes a stop portion 1211 located in the cavity 1221, and in the technical solution in which the projection of the stop portion 1211 at the other end of the mounting member 122 along the axial direction of the through hole does not overlap with the through hole, the locking portion 127 can be specifically arranged on the stop portion 1211.

[0108] like Figure 6As shown, the cable tie 12 may further include a stopper 1211 located in the cavity 1221 , the second end is connected to the stopper 1211 , and the latch hole 126 may be specifically provided on the stopper 1211 .

[0109] Here, it should be noted that the external force should be understood in a broad sense. For example, the external force can be provided by a user, and the user applies it to the pressure member 1281, causing the pressure member 1281 to switch from the first position to the second position, thereby applying a force to the locking portion 127.

[0110] As an alternative embodiment, the pressure member 1281 may be a magnetic member, and the stopper 1211 may be constructed as an electromagnet. A coil is wound around the stopper 1211, and the coil is connected to the power supply to form a circuit. The circuit can be switched on and off, allowing the coil to switch between an energized state and an unenergized state. When the coil is in the unenergized state, the pressure member 1281 is in the first position. When the coil is in the energized state, the electromagnet and the pressure member 1281 attract each other. Under the action of the magnetic attraction between the electromagnet and the pressure member 1281, the pressure member 1281 switches from the first position to the second position. In this example, the external force is the magnetic attraction between the electromagnet and the pressure member 1281. The magnetic member can be a magnet with magnetism (for example, a permanent magnet) or a magnetic metal that can be attracted by a magnet (for example, iron, cobalt, nickel).

[0111] This embodiment introduces a pressure member 1281 , which can conveniently apply a force to the locking portion 127 through the pressure member 1281 .

[0112] According to some embodiments of the present application, the cable tie 12 may further include a base 128 and a first spring 1282 located outside the cavity 1221, the base 128 is set on the mounting member 122, the first spring 1282 is arranged outside the pressure member 1281, one end of the first spring 1282 is fixedly connected to one of the base 128 and the mounting member 122, and the other end is connected to the pressure member 1281, and the first spring 1282 is used to maintain the pressure member 1281 in the first position in a natural state.

[0113] The surface of the pressure member 1281 may be provided with a flange protruding therefrom, the flange extending in a direction perpendicular to the axial direction of the opening, and the other end of the first spring 1282 is connected to the flange.

[0114] One end of the first spring 1282 may be connected to the circumferential edge of the opening on the mounting member 122. Alternatively, Figure 6 As shown, one end of the first spring 1282 can also be connected to the base 128. In the example where one end of the first spring 1282 is connected to the base 128, as shown in FIG. Figure 6As shown, the base 128 may further be constructed with a receiving groove. Along the axis of the opening, the receiving groove comprises a first wall 1283 and a second wall 1284, which are arranged opposite each other. The opening extends through the first wall 1283, and the second wall 1284 is provided with a through-hole extending through its thickness. A first spring 1282 is housed in the receiving groove. A pressure member 1281 passes through the through-hole, the receiving groove, and the opening, in sequence. The flange is located in the receiving groove and abuts against the circumferential edge of the through-hole on the second wall 1284. In this embodiment, before the distance measuring element 124 detects that the normal distance has decreased to a threshold value, the first spring 1282 naturally maintains the pressure member 1281 in the first position. When the distance measuring element 124 detects that the normal distance has decreased to a threshold value, it sends a warning signal to the battery management system 30. Driven by an external force, the pressure member 1281 moves relative to the base 128 and the mounting member 122, switching from the first position to the second position. During this process, the first spring 1282 deforms. After the locking portion 127 is disengaged from the locking hole 126, the external force applied to the pressure member 1281 is cancelled, the external force on the pressure member 1281 disappears, and the first spring 1282 recovers its deformation to drive the locking portion 127 from the second position back to the first position.

[0115] One end of the first spring 1282 can be fixedly connected to the mounting member 122 or the base 128 by bonding, welding, or the like, or they can abut against each other. Similarly, the other end of the first spring 1282 can be fixedly connected to the flange of the pressure member 1281 by bonding, welding, or the like, or they can abut against each other.

[0116] In this embodiment, the first spring 1282 is introduced to enable the pressure member 1281 to move between the first position and the second position relative to the mounting member 122 and to remain in the first position.

[0117] According to some embodiments of this application, please continue to refer to Figures 6 to 8 Cable tie 12 may further include a stopper 1211 and an elastic member 129 located within cavity 1221. The second end is connected to stopper 1211, and the projection of stopper 1211 along the axial direction of the through-hole at the other end of mounting member 122 does not overlap with the through-hole. In other words, stopper 1211 cannot pass through the through-hole. The ends of elastic member 129 are respectively connected to stopper 1211 and the other end of mounting member 122 where the through-hole is formed. When the second end is separated from mounting member 122, stopper 1211 moves relative to mounting member 122 and compresses elastic member 129.

[0118] The elastic member 129 may be a component with an elastic structure, such as a memory alloy member, or a Figure 6As shown in the second spring 1291, the second spring 1291 is sleeved outside the belt body 121. The two ends of the elastic member 129 and the stopper 1211 and the mounting member 122 can be fixedly connected by bonding, welding, etc., or can resist each other.

[0119] When the locking portion 127 is in the unlocked state, the battery cell group 10 continues to expand, which will increase the force on the annular structure. Under the expansion force, the second end moves relative to the mounting member 122, driving the stop portion 1211 to move gradually closer to the through hole. During this process, the stop portion 1211 presses against the elastic member 129, causing the elastic member 129 to deform.

[0120] In this embodiment, an elastic member 129 is introduced. When the second end moves relative to the mounting member 122, the elastic member 129 is deformed, so that the stop portion 1211 needs to overcome the elastic force generated by the deformation of the elastic member 129 when moving toward the through hole. This prevents the first section from instantly moving out of the cavity 1221 under the action of the expansion force, that is, the first section is gradually released to participate in the change in the circumference of the annular structure, so that the degree of change in the circumference of the annular structure can match the degree of expansion of the battery cell group 10.

[0121] In the technical solution where the cable tie 12 is configured such that the second end can move relative to the mounting member 122 after the deformation of the length of the strap body 121 reaches the maximum deformation, there are multiple options for the alarm element.

[0122] According to some embodiments of the present application, a pressure sensor may also be provided on the mounting member 122. When the deformation of the circumference of the annular structure reaches a limit deformation, the stop portion 1211 offsets the pressure sensor. The alarm element may be at least one of a central control screen, a speaker, and an indicator light of an electrical device or an energy storage device equipped with the battery pack 100. When the pressure detected by the pressure sensor exceeds a threshold value, the alarm element sends an alarm signal.

[0123] According to some embodiments of the present application, in the technical solution in which the ranging element 124 generates an early warning signal and sends it to the battery management system 30 when the detected normal distance reaches a threshold, the alarm element can specifically be an alarm button 123 disposed in the cavity 1221. The implementation of triggering the alarm button 123 includes, but is not limited to, the following possible scenarios.

[0124] In some embodiments, when the deformation of the circumference of the annular structure reaches the limit deformation, such as Figure 6 As shown, the locking portion 127 connected to the second end abuts against the alarm button 123 . In this example, the locking portion 127 triggers the alarm button 123 .

[0125] During the charge and discharge process of the battery pack 100 of this embodiment, after the distance measuring element 124 detects a normal distance reaching a threshold and issues an alarm signal, it applies an external force to the locking portion 127, causing the locking portion 127 to switch from a locked state to an unlocked state. The battery cell group 10 then continues to expand, increasing the force on the annular structure. Under this expansion force, the second end moves relative to the mounting member 122, and the locking portion 127 gradually approaches the alarm button 123. When the alarm button 123 is pressed, an alarm signal is issued. In response to receiving the alarm signal, the electrical device or energy storage device equipped with the battery pack 100 can alert the user through at least one of an alarm tone, a light with a specific changing pattern, text on the central control screen, and voice.

[0126] In this way, the alarm signal is triggered by the physical contact between the locking portion 127 and the alarm button 123. This method of triggering the alarm is less affected by external interference and program errors, and has high stability and reliability.

[0127] In a technical solution in which cable tie 12 further includes a stopper 1211 positioned within cavity 1221, and the projection of stopper 1211 along the axial direction of the through-hole at the other end of mounting member 122 does not overlap with the through-hole, it is further designed so that when the circumference of the annular structure reaches a limit deformation, stopper 1211 abuts against alarm button 123. In this embodiment, the alarm signal is triggered by the physical contact between stopper 1211 and alarm button 123. This alarm triggering method is less susceptible to external interference and program errors, and has high stability and reliability.

[0128] According to some embodiments of this application, please continue to refer to Figure 6 In the technical solution where the cable tie 12 further includes a base 128 disposed on the mounting member 122 and located outside the cavity 1221, the distance measuring element 124 can be specifically disposed on the base 128. In this way, the base 128 provides a mounting and fixing foundation for the distance measuring element 124.

[0129] According to some embodiments of this application, please continue to refer to Figure 3 The box body 20 has an inner cavity, and the box body 20 may also include a partition 25 arranged in the inner cavity and opposite to the reference wall. The partition 25 divides the inner cavity into a first compartment and a second compartment. The battery management system 30 is accommodated in the first compartment, and all battery cell groups 10 are accommodated in the second compartment and are against the partition 25. The cable tie 12 is located above the partition 25.

[0130] The battery management system 30 and the distance measuring element 124 are electrically connected via a low voltage harness 31. The extending direction of the partition 25 can be parallel to the arrangement direction of the multiple battery cells 11 of the battery cell group 10, or, as shown in FIG. Figure 3As shown, the extending direction of the partition 25 can also be perpendicular to the arrangement direction of the multiple battery cells 11 of the battery cell group 10. It can be understood that because the cable tie 12 is located above the partition 25, the partition 25 does not restrict the movement of the belt body 121, allowing the belt body 121 to adaptively stretch and deform under the expansion force.

[0131] In this embodiment, the partition 25 separates the inner cavity into a first compartment and a second compartment. The battery cell group 10 and the battery management system 30 can be accommodated in different compartments. This can electrically isolate the high-voltage part and the low-voltage part, helping to reduce the risk of safety problems caused by short circuits.

[0132] Moreover, this is also conducive to optimizing the heat dissipation design to reduce the accumulation of heat generated by the battery cell group 10 and the battery management system 30 during the operation of the battery pack 100. In addition, the battery cell group 10 and the battery management system 30 can be easily inspected and maintained separately.

[0133] According to some embodiments of the present application, an insulating layer may be provided on the inner surface of the strip 121 facing the outer periphery of the battery cell group 10, and the insulating layer is used to insulate and isolate the battery cell group 10 from the strip 121. The material of the insulating layer may be polytetrafluoroethylene, polyethylene, or the like. The insulating layer may be made by a spraying process, a dip coating process, a 3D printing process, an electrophoretic deposition process, a chemical deposition process, and a casting process. In this embodiment, by introducing an insulating layer, the insulating layer is used to insulate and isolate the battery cell group 10 from the strip 121, thereby reducing the risk of electrical connection between the battery cell group 10 and the strip 121, which is beneficial to improving the electrical safety of the battery pack 100.

[0134] A second aspect of the present application further provides an electrical device, comprising any of the battery packs 100 provided in the first aspect of the present application, for providing electrical energy. The electrical device comprises the battery pack 100 of the first aspect described above, and the beneficial effects of the electrical device are the same as those of the battery pack 100 of the first aspect described above, and are not further elaborated herein.

[0135] The third aspect of the present application further provides an energy storage device, comprising any of the battery packs 100 provided in the first aspect of the present application, for providing electrical energy. The energy storage device comprises the battery pack 100 of the first aspect described above, and the beneficial effects of the energy storage device are the same as those of the battery pack 100 of the first aspect described above, and are not further described herein.

[0136] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

[0137] In the embodiments of the present application, Figure 3 、 Figure 4 and Figure 6 As shown, the battery pack 100 includes a box 20 , a battery cell group 10 and a cable tie 12 .

[0138] The box body 20 is in the shape of a rectangular parallelepiped and includes a first side wall 23 and a second side wall 24. A partition 25 is provided in the inner cavity of the box body 20 to separate the inner cavity into a first chamber and a second chamber. The partition 25 is parallel to the first side wall 23 and the second side wall 24.

[0139] The battery management system 30 of the battery pack 100 is housed in the first compartment. Three battery cell groups 10 are provided, each housed in the second compartment and arranged sequentially along the extension direction of the separator 25. The battery cell groups 10 include battery cells 11 arranged sequentially along the thickness direction of the separator 25. The multiple battery cells 11 are connected in series, parallel, or parallel-parallel via a busbar assembly.

[0140] Three cable ties 12 are also provided, corresponding one to each of the three battery cell groups 10. Each cable tie 12 is placed around the outer periphery of the corresponding battery cell group 10, securing the battery cell groups 10 with the cable ties 12. The cable tie 12 comprises a strap body 121, a mounting member 122, an infrared laser ranging sensor, a base 128, an alarm button 123, and a pressure member 1281. The mounting member 122 defines a cavity 1221 and comprises a first plate 1222 and a second plate 1223, which are positioned opposite each other. The first plate 1222 has a through hole. The base 128 is disposed on the mounting member 122 and is located outside the cavity 1221.

[0141] An infrared laser ranging sensor is located outside cavity 1221 and mounted on base 128. It faces first sidewall 23, which is closer to the sensor than second sidewall 24. The infrared laser ranging sensor measures the normal distance between itself and first sidewall 23. The infrared laser ranging sensor is electrically connected to battery management system 30 via a low-voltage wiring harness 31. When the normal distance detected by the infrared laser ranging sensor reaches a threshold, the deformation of belt 121 reaches a maximum length, and the infrared laser ranging sensor generates a warning signal and transmits it to battery management system 30. The warning signal instructs battery management system 30 to execute a warning operation, which involves sending a warning message to vehicle 1000, causing the warning message to be displayed on the central control screen of vehicle 1000.

[0142] The strip 121 has a first end and a second end along the circumference of the battery cell group 10. The first end is fixedly connected to the side of the second plate 1223 facing away from the first plate 1222. The second end extends into the cavity 1221 through the through hole and is fixedly connected to the stopper 1211 within the cavity 1221. The strip 121 and the mounting member 122 form an annular structure. The projection of the stopper 1211 along the axial direction of the through hole at the other end of the mounting member 122 does not overlap with the through hole, and the stopper 1211 cannot pass through the through hole. The stopper 1211 is fixedly connected to a locking portion 127, which is configured to be compressible. The mounting member 122 is provided with a locking hole 126.

[0143] A receiving groove is formed on the base 128. Along the axial direction of the opening, the receiving groove has a first wall 1283 and a second wall 1284 arranged opposite to each other. The first wall 1283 is provided with an opening that penetrates its thickness, and the second wall 1284 is provided with a through hole that penetrates its thickness. The axes of the through hole, the opening and the clamping hole 126 are arranged in a collinear manner. A flange is protruding from the surface of the pressure member 1281, and the flange extends in a direction perpendicular to the axial direction of the opening. A first spring 1282 is provided on the outer sleeve of the pressure member 1281. The first spring 1282 is accommodated in the receiving groove. One end of the first spring 1282 is connected to the first wall 1283 and the other end is connected to the flange. The first spring 1282 maintains the pressure member 1281 in the first position in a natural state. The pressure member 1281 can move relative to the base 128 and the mounting member 122 under the drive of external force to switch from the first position to the second position. The first spring 1282 is deformed, and the pressure member 1281 applies a force to the locking portion 127, so that the locking portion 127 is compressed and deformed to switch from a locked state to an unlocked state.

[0144] In the locked state, the locking portion 127 engages with the locking hole 126 to prevent the second end from moving relative to the mounting member 122. The first section of the belt body 121 close to the second end is located in the cavity 1221. A second spring 1291 is provided on the outer sleeve of the first section. The two ends of the second spring 1291 are respectively connected to the mounting member 122 and the stop portion 1211.

[0145] In the unlocked state, locking portion 127 disengages locking hole 126, and the second end is able to move relative to mounting member 122, causing at least a portion of the first section to move out of cavity 1221. When the second end moves until locking portion 127 abuts against alarm button 123, the deformation of the annular structure's circumference reaches a limit, and alarm button 123 issues an alarm signal to vehicle 1000 equipped with battery pack 100. In response to receiving the alarm signal, vehicle 1000 issues an alarm prompt to the user through at least one of an alarm tone, lights with a specific changing pattern, text on the central control screen, and voice.

[0146] like Figure 6 As shown, the operating process of the battery pack 100 of this embodiment is generally as follows: during charging and discharging, the battery cell group 10 expands, the length of the band 121 and the circumference of the ring structure gradually increase, and the infrared laser ranging sensor approaches the first sidewall surface 23, gradually decreasing the normal distance. When the infrared laser ranging sensor detects that the normal distance has decreased to a threshold value, indicating that the deformation of the length of the band 121 has reached the maximum deformation δ, a warning signal is generated and sent to the battery management system 30. In response to receiving the warning signal, the battery management system 30 sends a warning message to the vehicle 1000, causing the warning message to be displayed on the central control screen of the vehicle 1000.

[0147] The user learns from the warning message that the deformation of the belt body 121 has reached the maximum deformation δ and drives the vehicle 1000 to a repair center. The repair center technician disassembles the box 20 and presses the pressure portion, causing it to switch from the first position to the second position under external force. The first spring 1282 deforms, and the pressure member 1281 applies a force to the locking portion 127, compressing and deforming the locking portion 127 so that it can be withdrawn from the locking hole 126.

[0148] If the battery pack 10 continues to expand, the expansion force causes the second end and stopper 1211 to move relative to the mounting member 122. During this process, the length of the band 121 no longer changes. The stopper 1211 gradually approaches the through-hole, and the locking portion 127 gradually approaches the alarm button 123, compressing the second spring 1291. The first section gradually releases outside the cavity 1221, and the circumference of the annular structure continues to increase. This continues until the locking portion 127 contacts the alarm button 123, reaching the limit deformation of the annular structure, and the alarm button 123 issues an alarm signal.

[0149] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery pack, characterized in that: include: A battery cell group, comprising a plurality of battery cells arranged in sequence; a cable tie, sleeved around the outer periphery of the battery cell group, the battery cell group being bound and fixed by the cable tie; the cable tie comprising a strap body, a mounting member, and an alarm element disposed on the mounting member, the strap body having a first end and a second end along the circumference of the battery cell group, the first end and the second end being connected to the mounting member to form an annular structure, the alarm element being configured to emit an alarm signal when a deformation amount of a circumference of the annular structure reaches a limit deformation amount; The battery pack further includes a box, in which the battery cell group and the cable tie are housed; The cable tie further includes a distance measuring element, which is disposed on the mounting member and faces a reference wall of the box body. When the normal distance between the distance measuring element and the reference wall is a threshold value, the deformation of the length of the strap reaches a maximum deformation value. The distance measuring element is used to measure the normal distance. The cable tie is configured such that the second end cannot move relative to the mounting member after the deformation of the length of the cable tie reaches the maximum deformation. The ranging element serves as the alarm element, and the ranging element issues the alarm signal when the detected normal distance reaches a threshold value. Alternatively, the cable tie is configured such that the second end can move relative to the mounting member after the deformation of the length of the cable tie reaches the maximum deformation value. The ranging element is configured to be electrically connected to the battery management system of the battery pack. When the detected normal distance reaches the threshold value, the ranging element generates a warning signal and sends it to the battery management system. The warning signal is used to instruct the battery management system to perform a warning operation.

2. The battery pack according to claim 1, wherein: The first end and the second end are both fixedly connected to the mounting member, so that the cable tie can be configured such that the second end cannot move relative to the mounting member after the deformation of the length of the strap reaches the maximum deformation.

3. The battery pack according to claim 1, wherein: The mounting member is constructed to have a cavity inside, one end of the mounting member is closed and the other end is provided with a through hole; the first end is fixedly connected to one end of the mounting member; the second end passes through the through hole into the cavity and is connected to the mounting member, and the second end includes a first section accommodated in the cavity; the connection between the second end and the mounting member can be released, and after the deformation of the length of the belt body reaches the maximum deformation and the connection between the second end and the mounting member is released, the second end can move relative to the mounting member so that at least part of the first section moves out of the cavity.

4. The battery pack according to claim 3, wherein: The mounting member includes a first plate and a second plate arranged opposite to each other, the through hole is provided on the first plate, the first end is fixedly connected to a side of the second plate facing away from the first plate, and the second end is connected to a side of the second plate facing the first plate via a quick-release structure, and the quick-release structure releases the connection between the second end and the mounting member under the tension generated by the stretching of the belt body.

5. The battery pack according to claim 3, wherein: A latch hole is provided on one of the second end and the mounting member, and a locking portion is connected to the other one, wherein the center line of the latch hole is parallel to the axial direction of the annular structure, and the locking portion has a locked state and an unlocked state; in the locked state, the locking portion engages with the latch hole to prevent the second end from moving relative to the mounting member; in the unlocked state, the locking portion is disengaged from the latch hole, and the second end can move relative to the mounting member; When the deformation of the belt length reaches the maximum deformation and the normal distance detected by the distance measuring element reaches the threshold, the locking portion can be switched from the locked state to the unlocked state under the action of a force.

6. The battery pack according to claim 5, characterized in that: The locking hole is provided on the mounting member, and the locking portion is configured to be compressible and fixedly connected to the second end; The cable tie also includes a pressure piece opposite to the locking hole, which is connected to the mounting piece and can move relative to the mounting piece under the action of an external force, so that the pressure piece switches between a first position and a second position along the axial direction of the locking hole. During the movement of the pressure piece from the first position to the second position, the locking portion is compressed and deformed to disengage from the locking hole.

7. The battery pack according to claim 6, characterized in that: The cable tie also includes a base and a first spring located outside the cavity, the base is arranged on the mounting member, the first spring is arranged outside the pressure member, one end of the first spring is fixedly connected to one of the base and the mounting member, and the other end is connected to the pressure member, and the first spring is used to maintain the pressure member in the first position in a natural state.

8. The battery pack according to any one of claims 5 to 7, characterized in that: The alarm element is an alarm button arranged in the cavity; When the deformation amount of the circumference of the annular structure reaches the limit deformation amount, the locking portion connected to the second end presses against the alarm button.

9. The battery pack according to any one of claims 3 to 7, characterized in that: The cable tie further includes a stopper and an elastic member located in the cavity, the second end being connected to the stopper, and a projection of the stopper at the other end of the mounting member along the axial direction of the through hole having a non-overlapping area with the through hole; Both ends of the elastic member are respectively connected to the stopper and the other end of the mounting member having the through hole. When the second end is separated from the mounting member, the stopper moves relative to the mounting member and squeezes the elastic member.

10. The battery pack according to any one of claims 1 to 7, characterized in that: The box body has an inner cavity, and further includes a partition arranged in the inner cavity and opposite to the reference wall surface, the partition dividing the inner cavity into a first chamber and a second chamber, the battery management system is accommodated in the first chamber, all the battery cell groups are accommodated in the second chamber and against the partition, and the cable tie is located above the partition.

11. The battery pack according to any one of claims 1 to 7, characterized in that: An insulating layer is provided on the inner surface of the belt body facing the outer periphery of the battery cell group, and the insulating layer is used for insulating and isolating the battery cell group and the belt body.

12. An electrical device, characterized in that: The electrical device comprises the battery pack according to any one of claims 1 to 11, and the battery pack is used to provide electrical energy.

13. An energy storage device, characterized in that: The energy storage device comprises the battery pack according to any one of claims 1 to 11.

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