Battery pack, electric equipment and energy storage device

Abstract

The invention provides a battery pack, electric equipment and an energy storage device, and belongs to the field of batteries. The battery pack comprises a battery monomer group and a ribbon; the battery monomer group comprises a plurality of battery monomers which are arranged in sequence; the binding belt sleeves the periphery of the battery monomer group so as to bind and fix the battery monomer group; the binding belt comprises a belt body, a mounting part and an alarm element arranged on the mounting part, the belt body is provided with a first end and a second end along the circumferential direction of the battery monomer group, the first end and the second end are connected with the mounting part to form an annular structure, and the alarm element is configured to send an alarm signal when the deformation of the perimeter of the annular structure reaches the limit deformation. In the working process of the battery pack, when the battery monomer group expands until the deformation amount of the circumference of the annular structure reaches the limit deformation amount, the alarm element sends an alarm signal to remind a user, so that the user can take countermeasures before the belt body is broken, the damage degree of the belt body breakage to the battery pack is reduced and even eliminated, and the safety of the battery pack is improved. And a positive effect is brought to improvement of 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] In the context of global advocacy of energy conservation and environmental protection, the improvement of battery technology is crucial to promoting sustainable development. Among them, batteries, as a bridge between energy storage and conversion, have become the core factor in promoting the continuous progress of the two major fields of electric vehicles and energy storage.

[0003] When stacking battery cells to form a battery pack, a steel belt is used to tie the battery cells in a row and fix them before subsequent assembly. However, during the charge and discharge process of the battery pack, the battery cells will expand, and the volume of the battery cells will increase accordingly, which will increase the force on the steel belt and affect the safety of the battery pack. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the background technology. To this end, one purpose of the present application is to provide a battery pack, an electrical device and an energy storage device, which can send an alarm signal to remind the user before the cable tie breaks, which can reduce or even eliminate the degree of damage to the battery pack caused by the cable tie breaking, and bring 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 tied and fixed by 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 send an alarm signal when the deformation of the circumference of the annular structure reaches a limit deformation.

[0006] In the technical solution of the embodiment of the present application, the cable tie is designed to include a strap body and a mounting member, and the two ends of the strap body are connected to the mounting member to form an annular structure to be sleeved on the outer periphery of the battery cell group, and an alarm element is also provided on the mounting member. During the actual use of the battery pack, when the battery cell group expands to the point where the deformation of the circumference of the annular structure reaches the limit deformation, the alarm element sends an alarm signal, which can remind the user before the strap body breaks, so that the user can take countermeasures before the strap body breaks, thereby helping to reduce or even eliminate the degree of damage to the battery pack caused by the strap body breaking, and can have a positive effect on improving the safety of the battery pack.

[0007] In some embodiments, the battery pack further comprises a box body, in which the battery cell group and the cable tie are accommodated; the cable tie further comprises a distance measuring element, which is arranged on the mounting member and faces the reference wall of the box body, and 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; the distance measuring element is used to measure the normal distance; The cable tie is configured so that the second end cannot move relative to the mounting piece after the deformation of the length of the strap reaches the maximum deformation, the ranging element is used as an alarm element, and the ranging element sends an alarm signal when the detected normal distance reaches a threshold value, or the cable tie is configured so that the second end can move relative to the mounting piece after the deformation of the length of the strap reaches the maximum deformation, the ranging element is configured to be electrically connected to the battery management system of the battery pack, and the ranging element generates a warning signal when the detected normal distance reaches the threshold value and sends it to the battery management system, and the warning signal is used to instruct the battery management system to perform a warning operation.

[0008] In the technical solution where the second end cannot move relative to the mounting member after the deformation of the length of the belt reaches the maximum deformation, the distance measuring element can be used to detect the normal distance and trigger an alarm, so there is no need to set up an additional alarm element. In the technical solution where the second end can move relative to the mounting member after the deformation of the length of the belt reaches the maximum deformation, a warning is given before the alarm, so that more response time can be reserved for the user.

[0009] 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.

[0010] 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 penetrates into the cavity through the through hole 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 is moved out of the cavity.

[0011] 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.

[0012] 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.

[0013] This embodiment uses a quick-release structure to connect the second end to the mounting member and release the connection between the second end and the mounting member, which is simple and reliable, and the quick-release structure can automatically release the connection between the second end and the mounting member to reduce dependence on manual labor.

[0014] 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 is disengaged 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.

[0015] 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 group.

[0016] In some embodiments, 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, 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 locking hole, and the pressure piece applies a force to the locking portion during the movement from the first position to the second position, so that the locking portion is compressed and deformed to escape from the locking hole.

[0017] This embodiment introduces a pressure piece, so that a force can be easily applied to the locking portion through the pressure piece.

[0018] In some embodiments, the cable tie also includes a base and a first spring located outside the cavity, the base is disposed on the mounting member, the first spring is sleeved 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.

[0019] In this embodiment, the first spring is introduced 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.

[0020] 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.

[0021] 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 abuts against the alarm button.

[0022] 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.

[0023] 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 a projection of the stop portion along the axial direction of the through hole at the other end of the mounting member does not overlap 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.

[0024] In this embodiment, an elastic member is introduced. When the second end moves relative to the mounting member, it drives the stopper to move and squeezes the elastic member. The elastic member is deformed, so that the stopper 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.

[0025] 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.

[0026] In this embodiment, the battery cell group and the battery management system are housed in different compartments, so that the high voltage part and the low voltage part can be electrically isolated, which helps to reduce the risk of safety problems caused by short circuits.

[0027] In some embodiments, 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 to insulate and isolate the battery cell group from the belt body, thereby reducing the risk of electrical connection between the battery cell group and the belt body and improving the electrical safety of the battery pack.

[0028] An embodiment of the second aspect of the present application provides an electrical device, which includes a battery pack of any embodiment of the first aspect of the present application, and the battery pack is used to provide electrical energy.

[0029] 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.

[0030] 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

[0031] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0032] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application; Figure 2 A schematic diagram of the structure of a battery pack according to some embodiments of the present application; Figure 3 A schematic top view of a battery pack according to some embodiments of the present application; Figure 4 This is a schematic diagram of the structure of cable ties in some embodiments of the present application; Figure 5 It is a partial cross-sectional schematic diagram of cable ties of some other embodiments of the present application; Figure 6 A schematic diagram of the working process of the cable tie in some embodiments of the present application; Figure 7 It is a partial cross-sectional schematic diagram of cable ties of other embodiments of the present application; Figure 8 Schematic diagram of a partial cross section of cable ties according to some further embodiments of the present application.

[0033] Description of reference numerals: Vehicles 1000; Battery pack 100, controller 200, motor 300; Battery cell group 10, battery cell 11, cable tie 12, belt body 121, stopper 1211, mounting member 122, cavity 1221, first plate 1222, second plate 1223, alarm button 123, distance measuring element 124, quick release structure 125, card hole 126, locking portion 127, operating portion 1271, connecting portion 1272, rod body 1273, base 128, pressure member 1281, first spring 1282, first wall 1283, second wall 1284, elastic member 129, second spring 1291; Box body 20, first box body 21, second box body 22, first side wall surface 23, second side wall surface 24, partition plate 25; Battery management system 30 , low voltage wiring harness 31 . DETAILED DESCRIPTION

[0034] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0036] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0039] 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).

[0040] 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. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0041] 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.

[0042] The term "parallel" in this application includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "vertical" also includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0043] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0044] In order to prevent the battery cells from shaking in the battery pack box, steel belts are usually used to tie and fix multiple battery cells arranged in a row. However, during the charging and discharging process of the battery pack, the battery cells will continue to produce gas and expand, and the battery cells will expand against each other, causing the steel belt to gradually tighten. When the stress limit of the steel belt is exceeded, the steel belt will break, and the steel belt will fail to restrain a row of battery cells, which may cause battery cell shaking, short circuit (the broken steel belt is connected to the high-voltage electrical components of the battery pack, resulting in electrical connection between the electrical components) and other problems. Since the steel belt has a high rigidity, the broken steel belt may also pierce the battery cell, seriously affecting the safety of the battery.

[0045] In response to this problem, 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 that 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 secure enough.

[0046] Based on the above considerations, a battery pack, electrical equipment and energy storage device are designed, wherein the cable tie used in the battery pack includes a belt body and a mounting part, the belt body and the mounting part are connected to form an annular structure, and the battery cell group is tied and fixed by the annular structure. The cable tie is also designed to include an alarm element arranged on the mounting part, when the deformation of the circumference of the annular structure reaches the limit deformation, the alarm element sends out an alarm signal, and the user can timely find out that the battery cell group has expanded to the length deformation of the belt body and reached the maximum deformation according to the alarm signal, and then timely repair or replace the expanded battery cell group, so that the safety hazard of the belt body breaking and piercing the battery cell is eliminated. It can be seen that in such a battery pack, notifying the user to respond in time by sending an alarm signal before the belt body breaks is a pre-emptive prevention, which is conducive to reducing the losses caused by the belt body breaking.

[0047] Furthermore, 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 securely.

[0048] The first aspect of the present application provides a battery pack, which can be used for, but not limited to, electrical equipment, energy storage devices, etc. The battery pack involved in the present application can be used to form a power supply system for the electrical equipment. The battery pack involved in the present application can also be used to form a power supply system for the energy storage device.

[0049] The energy storage device using a battery pack as a power 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 an appropriate time. For example, the energy storage device can store electrical energy during low electricity consumption, and provide electrical energy to related 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.

[0050] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0051] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters (BatteryCluster), and the battery cluster is accommodated in the cabinet. The battery cluster may include multiple battery packs, and the multiple battery packs are connected in series through a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0052] In the embodiments of the present application, the electrical equipment using the battery pack as the power source may be, but is not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc. For the sake of simplicity, the following embodiments are all described by taking electric vehicles as an example.

[0053] 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 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery pack 100 is arranged inside the vehicle 1000, and the battery pack 100 may be arranged 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 be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery pack 100 to power the motor 300, for example, for the starting, navigation and driving power requirements of the vehicle 1000.

[0054] 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.

[0055] Figure 2 The structure diagram of the battery pack 100 of some embodiments of the present application is schematically shown. Figure 2As 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 mixed connection through a busbar component. Mixed connection means that the plurality of battery cells 11 are both connected in 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.

[0056] Among them, the battery cell 11 can be a secondary battery, and the secondary battery 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. Among them, the battery cell 11 can 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, etc., and the embodiments of the present application are not limited to this. As an example, the battery cell 11 can be a cylindrical battery cell, a prismatic battery cell, or a battery cell 11 of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, and a polygonal prismatic battery cell. The polygonal prismatic battery cell is, for example, a hexagonal prismatic battery cell, etc., and the present application has no special restrictions.

[0057] Figure 3 Schematically shows a top view of a battery pack of some embodiments of the present application, Figure 4 The structure diagram of the cable tie of some embodiments of the present application is schematically shown. Figure 3 and Figure 4 The battery pack 100 of the embodiment of the present application further includes a cable tie 12, which is sleeved on the outer circumference of the battery cell group 10, and the battery cell group 10 is tied and fixed by the cable tie 12. The cable tie 12 includes a belt body 121, a mounting member 122, and an alarm element arranged on the mounting member 122. The belt body 121 has a first end and a second end along the circumference of the battery cell group 10, and the first end and the second end are respectively connected to the two ends of the mounting member 122 to form an annular structure. The alarm element is configured to send an alarm signal when the deformation amount of the circumference of the annular structure reaches a limit deformation amount.

[0058] 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 basis 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.

[0059] It is understood that when the circumference of the annular structure reaches the limit deformation, it indicates that the expansion force on the belt body 121 reaches the maximum stress that it can withstand, and the deformation of the length of the belt body 121 reaches the maximum deformation. When the deformation of the length of the belt body 121 exceeds the maximum deformation, if the expansion force applied by the battery cell 11 to the belt body 121 continues to increase, the belt body 121 may break.

[0060] During the charging and discharging process of the battery pack 100 of this embodiment, the battery cells 11 will continue to produce gas and expand, and the volume of the battery cell group 10 will increase to apply expansion force to the belt body 121 and the mounting member 122. Under the action of the expansion force, the belt body 121 gradually stretches and deforms to adapt to the expansion of the battery cell group 10. During this process, the circumference of the annular structure gradually increases. When the battery cell group 10 expands to the point where the deformation of the circumference of the annular structure reaches the limit deformation, the alarm component sends an alarm signal to prompt the user to repair or replace the swollen battery cell group 10 in time.

[0061] In the battery pack 100 of this embodiment, the cable tie 12 is designed to include a belt body 121 and a mounting member 122. The two ends of the belt body 121 are connected to the mounting member 122 to form an annular structure to be sleeved on the outer periphery of the battery cell group 10, and an alarm element is also provided on the mounting member 122. In actual use of the battery pack 100, when the battery cell group 10 expands to the point where the deformation of the circumference of the annular structure reaches the limit deformation, the alarm element sends an alarm signal, which can remind the user before the belt body 121 breaks, so that the user can take countermeasures before the belt body 121 breaks, thereby helping to reduce or even eliminate the degree of damage to the battery pack 100 caused by the breakage of the belt body 121 (for example, the broken belt body 121 pierces the battery cell 11), which can have a positive effect on improving the safety of the battery pack 100.

[0062] Moreover, the alarm element in this embodiment can automatically trigger an alarm, has a high degree of intelligence, and reduces reliance on manual inspection, which can help improve user experience.

[0063] 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 formed by 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 by the annular structure.

[0064] According to some embodiments of the present application, Figure 2 and Figure 3 As shown, the battery pack 100 may further include a box 20, in which the battery cell group 10 and the cable tie 12 are accommodated. The cable tie 12 may further include a distance measuring element 124, which is disposed on the mounting member 122 and faces the reference wall of the box 20. When the normal distance between the distance measuring element 124 and the reference wall is a threshold value, 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.

[0065] In some embodiments, the box 20 may be a simple three-dimensional structure such as a single cuboid, cylinder or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders or spheres, etc. The material of the box 20 may be an alloy material such as aluminum alloy, iron alloy, etc., or a polymer material such as polycarbonate, polyisocyanurate foam plastic, or a composite material such as glass fiber plus epoxy resin, etc.

[0066] 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 as a whole and accommodated in the box 20.

[0067] As an example, the box 20 may include a first box 21 and a second box 22. The first box 21 and the second box 22 are buckled together so that a closed space is formed inside the box 20 to accommodate the battery cell group 10 and the cable tie 12. The closure here refers to 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 21 may be a top cover or a bottom plate. As an example, the box 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 so that a closed space is formed inside the box 20. In some embodiments, the box 20 may serve as part of the chassis structure of the vehicle 1000. For example, a portion of the box 20 may become at least a portion of the floor of the vehicle 1000, or a portion of the box 20 may become at least a portion of the crossbeam and longitudinal beam of the vehicle 1000.

[0068] The reference wall surface may be a side wall surface of the box body 20, or a wall surface of other components (such as a cross beam or a longitudinal beam) in the box body 20. For example, along the arrangement direction of the plurality of battery cells 11 of the battery cell group 10, the box body 20 has a first side wall surface 23 and a second side wall surface 24 opposite to each other, and the reference wall surface may be any one of the first side wall surface 23 and the second side wall surface 24. In the battery pack 100 disclosed herein, any one of an infrared laser ranging sensor and an ultrasonic ranging sensor may be used to implement the ranging element 124.

[0069] Figure 5 Schematically shows a partial cross-sectional view of a 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 so 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 be used as an alarm element, and the distance measuring element 124 sends an alarm signal when the detected normal distance reaches a threshold.

[0070] 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.

[0071] According to some embodiments of the present application, the first end and the second end may be fixedly connected to the mounting member 122 so that the cable tie 12 can be configured such 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.

[0072] 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.

[0073] As an alternative embodiment, Figure 5 As shown, the mounting member 122 can be constructed to have a cavity 1221 inside, and the cable tie 12 can also include a stopper 1211 located in the cavity 1221. The mounting member 122 is provided with a through hole, and the second end penetrates into the cavity 1221 through the through hole and is connected 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. In this way, the stopper 1211 cannot pass through the through hole, so that the second end cannot move relative to the mounting member 122. In this example, the stopper 1211 can also be fixedly connected to the mounting member 122.

[0074] Taking the reference wall as the first side wall 23, and the first side wall 23 being closer to the distance measuring element 124 than the second side wall 24, in the initial state of the battery pack 100 of this embodiment, the length of the belt 121 is L0, the normal distance is D0, and the circumference of the ring structure is P0. During the use of the battery pack 100 for charging and discharging, the battery cell group 10 expands, the length of the belt 121 and the circumference of the ring structure gradually increase, the distance measuring element 124 gradually approaches the first side wall 23, and the normal distance gradually decreases. When the distance measuring element 124 detects that the normal distance decreases to a threshold value, it means that the deformation of the length of the belt 121 reaches the maximum deformation δ, and the deformation of the circumference of the ring structure reaches the limit deformation ε, the length of the belt 121 is L0+δ, and the circumference of the ring structure is P0+ε, and the distance measuring element 124 sends an alarm signal.

[0075] 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 reaches 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.

[0076] Figure 6 The working process of the cable tie 12 of 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 8 Schematically shows a partial cross-sectional view of a cable tie 12 of some other embodiments of the present application. In some embodiments, 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 an early warning signal and sends it to the battery management system 30. The early warning signal is used to instruct the battery management system 30 to perform an early warning operation.

[0077] 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 121 through the remote server.

[0078] Taking the reference wall as the first side wall 23, and the first side wall 23 being closer to the distance measuring element 124 than the second side wall 24, in the initial state of the battery pack 100 of this embodiment, the length of the belt 121 is L0, the normal distance is D0, and the circumference of the ring structure is P0. During the use of the battery pack 100 for charging and discharging, the battery cell group 10 expands, the length of the belt 121 and the circumference of the ring structure gradually increase, the distance measuring element 124 gradually approaches the first side wall 23, and the normal distance gradually decreases. When the distance measuring element 124 detects that the normal distance decreases to a threshold value, it means that the deformation of the length of the belt 121 reaches the maximum deformation δ, and the length of the belt 121 is L0+δ accordingly. The distance measuring element 124 generates an early warning signal and sends it to the battery management system 30. The battery management system 30 performs an early warning operation in response to receiving the early warning signal. Afterwards, when the battery cell group 10 continues to expand, under the action of the expansion force, the second end moves relative to the mounting member 122. 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 element sends an alarm signal.

[0079] In this embodiment, when the normal distance detected by the distance measuring element 124 reaches the threshold, an early warning signal is sent to the battery management system 30, so that when the deformation of the length of the belt body 121 reaches the maximum deformation, an alarm can be issued to notify the user, and then the battery cell group 10 continues to expand, which will increase the force on the annular structure, and the second end moves relative to the mounting member 122, so that the annular structure adapts to the expansion of the battery cell group 10. It can be seen that in such a battery pack 100, when the deformation of the length of the belt body 121 reaches the maximum deformation, the battery management system 30 is notified by executing an early warning operation, that is, a warning is issued before an alarm. Since the deformation of the circumference of the annular structure has not reached the limit deformation at this time, more response time can be reserved for the user, and the risk of the belt body 121 breaking can be reduced to the greatest extent, which is conducive to minimizing the degree of damage to the battery pack 100 caused by the breakage of the belt body 121.

[0080] According to some embodiments of this application, please continue to refer to Figures 6 to 8 The mounting member 122 can be specifically constructed to have a cavity 1221 inside, one end of the mounting member 122 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 122, the second end penetrates into the cavity 1221 through the through hole and is connected to the mounting member 122, and the second end includes a first section accommodated in the cavity 1221. In addition, the connection between the second end and the mounting member 122 can be released. After the deformation of the length of the belt body 121 reaches the 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, so that at least part of the first section moves out of the cavity 1221.

[0081] The mounting member 122 may be constructed as a box body, a frame body, a “П” shape or other structures, which are not specifically limited in this embodiment.

[0082] 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 section is located in the cavity 1221. During the use of the battery pack 100 for charging and discharging, the battery cell group 10 expands, and the length of the belt body 121 and the circumference of the annular structure gradually increase. During this process, the first section remains in the cavity 1221. When 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 can be released. After that, the battery cell group 10 continues to expand, which increases the force on the annular structure, and the second end moves relative to the mounting member 122, driving the first section 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.

[0083] 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 allowed to move by releasing the connection between the second end and the mounting member 122, and the first section gradually moves out of the cavity 1221 to be able to participate in the change in the circumference of the annular structure, so that during the period from the battery management system 30 executing the early warning operation to the alarm element sending out 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.

[0084] It can be understood that there are various specific implementations in which the second end and the mounting member 122 can be connected and the connection relationship between the two can be released.

[0085] 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 that are arranged opposite to each other, a through hole is arranged on the first plate 1222, a first end is fixedly connected to a side of the second plate 1223 facing away from the first plate 1222, and a second end is 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.

[0086] The quick-release structure 125 may be realized by using one or more combinations of a snap-on structure, a magnetic structure, Velcro, a plug-in connection, and a fastener connection. Taking the quick-release structure 125 as a magnetic structure as an example, during the use of the battery pack 100 for charging and discharging, the battery cell group 10 expands and applies an expansion force to the annular structure, and the belt body 121 stretches and deforms under the expansion force. When the tension generated by the stretching of the belt body 121 is greater than the magnetic attraction of the magnetic structure, the connection between the second end and the mounting member 122 is released.

[0087] This embodiment uses the quick-release structure 125 to connect the second end to the mounting member 122 and to release the connection between the second end and the mounting member 122, which is simple and reliable. Moreover, under the tension generated by the stretching of the belt body 121, the quick-release structure 125 can automatically release the connection between the second end and the mounting member 122, which not only reduces the dependence on manual labor, but also responds promptly to reduce the risk of the belt body 121 breaking due to delayed release.

[0088] 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 with a locking portion 127 .

[0089] In summary, one of the mounting member 122 and the second end may be provided with a locking hole 126, and the other may be connected with a locking portion 127. The center line of the locking hole 126 is parallel to the axial direction of the annular structure. The locking portion 127 may have a locked state and an unlocked state. When the normal distance detected by the distance measuring element 124 reaches a threshold value (i.e., the deformation of the length of the belt body 121 reaches the maximum deformation δ), the locking portion 127 may be switched from the locked state to the unlocked state under the action of a force. In the locked state, the locking portion 127 is engaged with the locking hole 126 to prevent the second end from moving relative to the mounting member 122. In the unlocked state, the locking portion 127 is disengaged from the locking hole 126, and the second end can move relative to the mounting member 122.

[0090] Compared with the quick-release structure 125 , the locking portion 127 of this embodiment is reliably engaged with the locking hole 126 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 121 , so as to reliably restrain the battery cell group 10 .

[0091] exist Figure 7In the example shown, the locking portion 127 can be specifically connected to the mounting member 122, and the locking hole 126 is correspondingly arranged at the second end. The locking portion 127 can be constructed in a spherical, hemispherical, cylindrical or semi-cylindrical shape, and the mounting member 122 is provided with an opening, which is opposite to the locking hole 126, and the locking hole 126 is a blind hole, and the shape of the opening is adapted to the shape of the locking portion 127. An operating portion 1271 is arranged outside the inner cavity of the mounting member 122, and the operating portion 1271 is connected to the locking portion 127 through the connecting portion 1272 and the rod body 1273 in sequence, and 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.

[0092] During the use of the battery pack 100 of this embodiment, when the battery cell group 10 expands, an expansion force is applied to the annular structure, and the belt body 121 is stretched and deformed under the expansion force. 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 reaches the threshold, and then generates an early warning signal to send to the battery management system 30. In response to receiving the early warning signal, the battery management system 30 performs an early warning operation to notify the user, and the user applies force to the operating part 1271 to make the locking part 127 withdraw from the locking hole 126. Afterwards, when the battery cell group 10 continues to expand, under the action of the expansion force, the second end can move relative to the mounting member 122.

[0093] exist Figure 6 In the example shown, the locking hole 126 can be provided on the mounting member 122, and the locking portion 127 is configured to be compressible and fixedly connected to the second end. The cable tie 12 can also include a pressure member 1281 opposite to 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 switches between a first position and a second position along the axial direction of the locking hole 126, and the pressure member 1281 applies a force to the locking portion 127 during the movement from the first position to the second position, so that the locking portion 127 is compressed and deformed to escape from the locking hole 126.

[0094] Among them, 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 along the axial direction of the through hole at the other end of the mounting member 122 does not overlap with the through hole, the locking portion 127 can be specifically arranged on the stop portion 1211.

[0095] 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 locking hole 126 may be specifically provided on the stopper 1211 .

[0096] 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, so that the pressure member 1281 switches from the first position to the second position to apply a force to the locking portion 127.

[0097] As a replaceable embodiment, the pressure member 1281 can be a magnetic member, the stopper 1211 can 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 loop, which can be turned on and off so that the coil switches between the power-on state and the power-off state. When the coil is in the power-off state, the pressure member 1281 is located in the first position. When the coil is in the power-on state, the electromagnet and the pressure member 1281 attract each other, and 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. Among them, the magnetic member can be a magnet with magnetism (for example, a permanent magnet), or it can be a magnetic metal that can be attracted by a magnet (for example, iron, cobalt, nickel).

[0098] The present embodiment introduces a pressure member 1281 , so that a force can be conveniently applied to the locking portion 127 through the pressure member 1281 .

[0099] 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 disposed on the mounting member 122, the first spring 1282 is sleeved 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.

[0100] 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.

[0101] One end of the first spring 1282 may be connected to the circumferential edge of the opening on the mounting member 122. 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 can be further structured to form a receiving groove. 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 opening passes through the first wall 1283, and the second wall 1284 is provided with a through hole that passes through its own thickness. The first spring 1282 is accommodated in the receiving groove, and the 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 is reduced to a threshold value, the first spring 1282 maintains the pressure member 1281 in the first position in a natural state. When the distance measuring element 124 detects that the normal distance is reduced to a threshold value, it sends an early warning signal to the battery management system 30, and the pressure member 1281 moves relative to the base 128 and the mounting member 122 under the drive of an external force to switch from the first position to the second position, and the first spring 1282 is deformed during this process. 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.

[0102] Among them, one end of the first spring 1282 can be fixedly connected to the mounting member 122 or the base 128 by bonding, welding, etc., 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, etc., or they can abut against each other.

[0103] 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.

[0104] According to some embodiments of this application, please continue to refer to Figures 6 to 8 The cable tie 12 may also include a stopper 1211 and an elastic member 129 located in the cavity 1221, the second end being connected to the stopper 1211, and the projection of the stopper 1211 along the axial direction of the through hole at the other end of the mounting member 122 having a non-overlapping area with the through hole. In other words, the stopper 1211 cannot pass through the through hole. The two ends of the elastic member 129 are respectively connected to the stopper 1211 and the other end of the mounting member 122 having a through hole, and when the second end is separated from the mounting member 122, the stopper 1211 moves relative to the mounting member 122 and squeezes the elastic member 129.

[0105] The elastic member 129 may be a component having an elastic structure, such as a memory alloy member, or Figure 6The second spring 1291 shown in the figure 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.

[0106] 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 close to the through hole. During this process, the stop portion 1211 presses against the elastic member 129, causing the elastic member 129 to deform.

[0107] In this embodiment, the 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 stopper 1211 needs to overcome the elastic force generated by the deformation of the elastic member 129 when moving toward the through hole. This can prevent 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 of the circumference of the annular structure, so that the degree of change of the circumference of the annular structure can match the degree of expansion of the battery cell group 10.

[0108] 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.

[0109] 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 counteracts 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.

[0110] According to some embodiments of the present application, in the technical solution in which the distance measuring 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 may 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 situations.

[0111] 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 .

[0112] During the charging and discharging process of the battery pack 100 of this embodiment, after the distance measuring element 124 sends out an alarm signal when the detected normal distance reaches the threshold, an external force is applied to the locking portion 127, so that the locking portion 127 switches from the locked state to the unlocked state. After that, 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, and the locking portion 127 gradually approaches the alarm button 123. When the alarm button 123 is in a pressed state, an alarm signal is sent out. In response to receiving the alarm signal, the electrical equipment or energy storage device equipped with the battery pack 100 can send an alarm prompt to the user through at least one of an alarm prompt sound, a light with a specific change pattern, text on the central control screen, and voice.

[0113] 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.

[0114] In the technical solution in which the cable tie 12 further includes a stopper 1211 located in the cavity 1221, and 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, it can be further designed that when the deformation amount of the circumference of the annular structure reaches the limit deformation amount, the stopper 1211 abuts against the alarm button 123. In this embodiment, the alarm signal is triggered by the physical contact relationship between the stopper 1211 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.

[0115] 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 an installation and fixing basis for the distance measuring element 124.

[0116] 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 surface, the partition 25 divides the inner cavity into a first chamber and a second chamber, the battery management system 30 is accommodated in the first chamber, all the battery cell groups 10 are accommodated in the second chamber and are against the partition 25, and the cable tie 12 is located above the partition 25.

[0117] 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 may be parallel to the arrangement direction of the plurality of battery cells 11 of the battery cell group 10, or 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 since the cable tie 12 is located above the partition 25, the partition 25 will not restrict the movement of the belt body 121, so that the belt body 121 can be stretched and deformed adaptively under the expansion force.

[0118] In this embodiment, the partition 25 separates the inner cavity into a first chamber and a second chamber, and the battery cell group 10 and the battery management system 30 can be accommodated in different chambers. 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.

[0119] Moreover, this is also conducive to optimizing the heat dissipation design to reduce the accumulation and superposition 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.

[0120] According to some embodiments of the present application, the inner surface of the belt 121 facing the periphery of the battery cell group 10 may be provided with an insulating layer, and the insulating layer is used to insulate and isolate the battery cell group 10 from the belt 121. The material of the insulating layer may be polytetrafluoroethylene, polyethylene, and 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, an insulating layer is introduced to insulate and isolate the battery cell group 10 from the belt 121, thereby reducing the risk of electrical connection between the battery cell group 10 and the belt 121, which is beneficial to improving the electrical safety of the battery pack 100.

[0121] The second aspect of the present application further provides an electric device, which includes any battery pack 100 proposed in the first aspect of the present application, and the battery pack 100 is used to provide electric energy. The electric device has the battery pack 100 of the first aspect as described above, and the beneficial effects of the electric device are the same as the beneficial effects of the battery pack 100 of the first aspect as described above, which will not be described in detail in this application.

[0122] The third aspect of the present application further provides an energy storage device, which includes any battery pack 100 proposed in the first aspect of the present application, and the battery pack 100 is used to provide electrical energy. The energy storage device has the battery pack 100 of the first aspect as described above, and the beneficial effects of the energy storage device are the same as the beneficial effects of the battery pack 100 of the first aspect as described above, and are not further described in this application.

[0123] 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.

[0124] In the implementation mode of the present application, Figure 3 , Figure 4 and Figure 6 As shown, the battery pack 100 includes a box body 20 , a battery cell group 10 and a cable tie 12 .

[0125] The box body 20 is in a rectangular parallelepiped shape and includes a first side wall 23 and a second side wall 24 disposed opposite to each other. A partition 25 is disposed in the inner cavity of the box body 20, and the partition 25 divides the inner cavity into a first chamber and a second chamber. The partition 25 and the first side wall 23 and the second side wall 24 are parallel to each other.

[0126] The battery management system 30 of the battery pack 100 is accommodated in the first compartment. Three battery cell groups 10 are provided, and the three battery cell groups 10 are all accommodated in the second compartment and arranged in sequence along the extension direction of the partition 25. The battery cell group 10 includes battery cells 11 arranged in sequence along the thickness direction of the partition 25, and the plurality of battery cells 11 are connected in series, in parallel, or in mixed connection through a busbar component.

[0127] There are also three cable ties 12, which correspond to three battery cell groups 10 one by one. Each cable tie 12 is sleeved on the outer periphery of the corresponding battery cell group 10, and the battery cell group 10 is tied and fixed by the cable tie 12. The cable tie 12 includes a belt 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 has a cavity 1221 inside, and the mounting member 122 includes a first plate 1222 and a second plate 1223 that are arranged opposite to each other, and a through hole is opened on the first plate 1222. The base 128 is arranged on the mounting member 122 and is located outside the cavity 1221.

[0128] The infrared laser ranging sensor is located outside the cavity 1221 and is arranged on the base 128. The infrared laser ranging sensor faces the first side wall surface 23, and the first side wall surface 23 is closer to the infrared laser ranging sensor than the second side wall surface 24. The infrared laser ranging sensor is used to measure the normal distance between it and the first side wall surface 23. The infrared laser ranging sensor is electrically connected to the battery management system 30 through a low-voltage wiring harness 31. When the normal distance detected by the infrared laser ranging sensor reaches a threshold, the deformation of the length of the belt 121 reaches a maximum deformation, and the infrared laser ranging sensor generates an early warning signal and sends it to the battery management system 30. The early warning signal is used to instruct the battery management system 30 to perform an early warning operation. The early warning operation is to send an early warning message to the vehicle 1000, so that the central control screen of the vehicle 1000 displays the early warning message.

[0129] The belt body 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 in the cavity 1221. The belt body 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, and the locking portion 127 is configured to be compressible. A clamping hole 126 is provided on the mounting member 122.

[0130] The base 128 is structured with a receiving groove. 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 colinear 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. The pressure member 1281 is provided with a first spring 1282 on its outer sleeve. 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.

[0131] 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.

[0132] In the unlocked state, the locking portion 127 is disengaged from the locking hole 126, and the second end can move relative to the mounting member 122, so that at least part of the first section moves out of the cavity 1221. When the second end moves to the locking portion 127 against the alarm button 123, the deformation of the circumference of the annular structure reaches the limit deformation, and the alarm button 123 sends an alarm signal to the vehicle 1000 equipped with the battery pack 100. In response to receiving the alarm signal, the vehicle 1000 sends an alarm prompt to the user through at least one of an alarm prompt sound, a light with a specific change pattern, text on the central control screen, and voice.

[0133] like Figure 6 As shown, the working process of the battery pack 100 of this embodiment is roughly as follows: during the charging and discharging process, the battery cell group 10 expands, the length of the belt body 121 and the circumference of the ring structure gradually increase, the infrared laser ranging sensor approaches the first side wall surface 23, and the normal distance gradually decreases. When the infrared laser ranging sensor detects that the normal distance decreases to reach the threshold, it means that the deformation of the length of the belt body 121 reaches the maximum deformation δ, and an early warning signal is generated and sent to the battery management system 30. In response to receiving the early warning signal, the battery management system 30 sends an early warning message to the vehicle 1000, so that the central control screen of the vehicle 1000 displays the early warning message.

[0134] The user learns from the warning information that the deformation of the length of the belt body 121 reaches the maximum deformation δ, and drives the vehicle 1000 to the maintenance center. The maintenance personnel of the maintenance center disassemble the box body 20, press the pressure part, so that the pressure part switches from the first position to the second position under the external force, the first spring 1282 is deformed, and the pressure member 1281 applies a force to the locking part 127, so that the locking part 127 is compressed and deformed to withdraw from the locking hole 126.

[0135] If the battery cell group 10 continues to expand, under the action of the expansion force, the second end and the stopper 1211 move relative to the mounting member 122. During this process, the length of the belt body 121 no longer changes, the stopper 1211 gradually approaches the through hole, the locking portion 127 gradually approaches the alarm button 123 and squeezes the second spring 1291, the first section gradually releases to the outside of the cavity 1221, and the circumference of the annular structure continues to increase. Until the locking portion 127 contacts the alarm button 123, the deformation of the circumference of the annular structure reaches the limit deformation, and the alarm button 123 sends an alarm signal.

[0136] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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 is sleeved on the outer circumference of the battery cell group, and the battery cell group is tied and fixed by the cable tie; the cable tie includes a belt body, a mounting member and an alarm element arranged 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, and the alarm element is configured to send an alarm signal when the deformation of the circumference of the annular structure reaches a limit deformation.

2. The battery pack according to claim 1, characterized in that: The battery pack further comprises a box, in which the battery cell group and the cable tie are accommodated; The cable tie further comprises a distance measuring element, which is arranged on the mounting member and faces the reference wall of the box body, and 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; the distance measuring element is used to measure the normal distance; 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 strap reaches the maximum deformation, the ranging element is used as the alarm element, and the ranging element sends out the alarm signal when the detected normal distance reaches a threshold value, or 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 strap reaches the maximum deformation, the ranging element is configured to be electrically connected to the battery management system of the battery pack, and the ranging element generates a warning signal when the detected normal distance reaches the threshold value and sends it to the battery management system, and the warning signal is used to instruct the battery management system to perform a warning operation.

3. The battery pack according to claim 2, characterized in that: 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.

4. The battery pack according to claim 2, characterized in that: 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 penetrates into the cavity through the through hole and is connected to the mounting member, 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.

5. The battery pack according to claim 4, characterized in that: The mounting member includes a first plate and a second plate arranged opposite to each other, the 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 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.

6. The battery pack according to claim 4, characterized in that: A clamping 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 clamping 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 is engaged with the clamping hole to prevent the second end from moving relative to the mounting member; in the unlocked state, the locking portion is disengaged from the clamping hole, and the second end can move relative to the mounting member; When the deformation amount of the belt length reaches the maximum deformation amount and the normal distance detected by the distance measuring element reaches the threshold value, the locking portion can be switched from the locked state to the unlocked state under the action of force.

7. The battery pack according to claim 6, characterized in that: The clamping hole is arranged 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 clamping hole, the pressure piece 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 clamping hole, and the pressure piece applies a force to the locking portion during the movement from the first position to the second position, so that the locking portion is compressed and deformed to escape from the clamping hole.

8. The battery pack according to claim 7, 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 sleeved 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.

9. The battery pack according to any one of claims 6 to 8, characterized in that: The alarm element is an alarm button disposed 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 abuts against the alarm button.

10. The battery pack according to any one of claims 4 to 8, characterized in that: The cable tie further comprises a stopper and an elastic member located in the cavity, the second end is 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 has 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, and when the second end is separated from the mounting member, the stopper moves relative to the mounting member and squeezes the elastic member.

11. The battery pack according to any one of claims 2 to 8, characterized in that: The box body has an inner cavity, and 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 the battery cell groups are accommodated in the second chamber and abut against the partition, and the cable tie is located above the partition.

12. The battery pack according to any one of claims 1 to 8, 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.

13. An electrical equipment, characterized in that: The electrical device comprises a battery pack as claimed in any one of claims 1 to 12, wherein the battery pack is used to provide electrical energy.

14. An energy storage device, characterized in that: The energy storage device comprises a battery pack as claimed in any one of claims 1 to 12.

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