Battery group fastening structure and portable power supply

Abstract

The invention provides a battery group fastening structure and a portable power supply. The battery group fastening structure comprises a bottom shell, at least two connecting vertical sheets, an adaptive bottom support and a fastening bracket, the bottom shell is provided with a placement area, an adaptive part is formed in the placement area of the bottom shell, and the bottom shell can be matched with the cylindrical battery cell module through the adaptive part; the at least two connecting vertical sheets are mounted on the bottom shell and distributed on the peripheral side of the placement area; the adaptive bottom support is arranged in the placing area and covers the adaptive part in an adaptive manner; the adaptive bottom support is detachably connected to the bottom shell, so that the adaptive bottom support can be adaptive to and cover the adaptive part, then the square battery cell module can be adaptive to the adaptive bottom support so as to be flatly placed, and at the moment, each side end of the fastening bracket is detachably connected to at least one corresponding connecting vertical sheet; the square battery cell module can be jointly clamped and fixed by the adaptive bottom support and the fastening bracket, so that the gravity center of the square battery cell module is stable, shaking is reduced, and power supply is more stable.

Description

Technical Field

[0001] The present disclosure relates to the technical field of new energy storage equipment, and in particular to a battery group fastening structure and a portable power source. Background Art

[0002] An existing household outdoor power supply improves the portability of the energy storage power supply. However, the above-mentioned household outdoor power supply is mainly adapted to cylindrical battery modules when it is designed. When the square battery is directly set in the receiving cavity of the household outdoor power supply, the square battery module is easy to interfere with the matching structure on the cavity wall of the receiving cavity, such as some positioning protrusions and limit bosses used to install and fix the cylindrical battery module, and the square battery module is easily placed crookedly. In the crooked state, the center of gravity of the square battery module is easy to be unstable and shake, which further affects the power supply stability of the square battery module. In response to the above problems, the shell of the household outdoor power supply or the outer surface of the square battery module is redesigned and molded. This will not only cause the shell of the household outdoor power supply originally adapted to the cylindrical battery module to accumulate pressure in stock, but also increase the production cost by re-molding. Summary of the invention

[0003] The purpose of the present disclosure is to overcome the deficiencies in the prior art and to provide a battery group fastening structure and a portable power source that are compatible with cylindrical battery modules and square battery modules.

[0004] The purpose of this disclosure is achieved through the following technical solutions: A battery group fastening structure, comprising: A bottom shell, wherein the bottom shell has a placement area, and the bottom shell forms an adapter portion in the placement area, and the adapter portion is used to match the cylindrical battery module placed in the placement area; At least two connecting vertical sheets, at least two of which are mounted on the bottom shell and distributed around the placement area; The battery group fastening structure also includes an adapting base and a fastening bracket; The adapting base is arranged in the placement area and is adapted to cover the adapting portion; the adapting base is detachably connected to the bottom shell, and the adapting base is used to adapt to the square battery cell module; the fastening bracket is used to press against the side of the square battery cell module or the cylindrical battery cell module away from the placement area, and is located between at least two of the connecting vertical sheets; each side end of the fastening bracket is detachably connected to at least one corresponding connecting vertical sheet to press and fix the square battery cell module or the cylindrical battery cell module in the placement area.

[0005] In some embodiments, the fastening bracket includes an intermediate pressing plate and at least two end plates, each of the end plates is respectively arranged opposite to a side surface of the square battery cell module or the cylindrical battery cell module, and is detachably connected to at least one corresponding connecting vertical plate; the intermediate pressing plate is used to press against the top surface of the square battery cell module or the cylindrical battery cell module, and is connected to each of the end plates.

[0006] In some embodiments, the end plate includes a main board portion and a side piece portion that are integrally connected; the main board portion is in contact with a side surface of the square battery cell module or the cylindrical battery cell module, and is detachably connected to the middle pressing plate; the side piece portion is bent in a direction perpendicular to the main board portion to form a support and restraint arm, and the support and restraint arm is locked and connected to the connecting vertical piece.

[0007] In some embodiments, a hollow window is provided on the end plate; a portion of the end plate is folded outward along the edge of the hollow window to form a positioning ear; the positioning ear abuts against and locks onto the supporting column on the adapter base.

[0008] In some of the embodiments, part of the end plate is bent in a direction perpendicular to the corresponding circumferential side surface of the square battery cell module or the cylindrical battery cell module to form a mounting platform; a locking assembly is fixedly arranged on the mounting platform; the locking assembly is used to fasten external wires and the external bus of the square battery cell module, or the locking assembly is used to fasten external wires and the external conductive piece of the cylindrical battery cell module.

[0009] In some embodiments, the battery group fastening structure further includes a pre-tightening strap, and the pre-tightening strap is sleeved outside the two end plates; and / or, The battery group fastening structure further includes a buffer spacer, which is used to be arranged between the middle pressing sheet and the square battery cell module or the cylindrical battery cell module; and / or, The battery group fastening structure also includes an insulating gasket, which is used to be arranged between the adapter base and the square battery cell module.

[0010] In some of the embodiments, the battery group fastening structure further includes a BMS board, which is mounted on the fastening bracket and is used to electrically connect to the square battery cell module or the cylindrical battery cell module.

[0011] In some of the embodiments, a plurality of pressure relief and explosion-proof holes are provided on the intermediate pressing plate, and each of the pressure relief and explosion-proof holes is used to be arranged opposite to the gap between two adjacent square battery cell units in the square battery cell module; the BMS board is arranged in parallel on the intermediate pressing plate, and an air pressure sensor is installed on the BMS board at a position opposite to each of the pressure relief and explosion-proof holes, and each of the air pressure sensors is electrically connected to the BMS board respectively; a conical air guide tube is sealed on each of the pressure relief and explosion-proof holes, and the exhaust port of each of the conical air guide tubes is respectively abutted against the pressure measuring diaphragm of a corresponding one of the air pressure sensors.

[0012] In some embodiments, the adapter base includes a main sheet body and a plurality of lifting protrusions that are integrally connected; the main sheet body is adapted to and covers the adapter portion; each of the lifting protrusions protrudes to an equal height away from the adapter portion, and is used to jointly support the bottom surface of the square battery cell module.

[0013] A portable power source comprises a cover shell, a square battery cell module and a battery group fastening structure of any of the above embodiments; the cover shell and the bottom shell are interlocked to form a receiving cavity; the square battery cell module is arranged in the receiving cavity and is adapted to the adapting base; the fastening bracket is pressed against the side of the square battery cell module away from the adapting base.

[0014] Compared with the prior art, the present invention has at least the following advantages: 1) Since the bottom shell has an adapter portion formed in the placement area, when the cylindrical battery cell module is placed in the placement area, the bottom shell can match the cylindrical battery cell module through the adapter portion to limit and fix the cylindrical battery cell module, without installing an adapter base on the bottom shell. And since the adapter base and the bottom shell are detachably connected, when the square battery cell module needs to be adapted and installed on the bottom shell, the adapter base can be adapted to and cover the adapter portion, and then the square battery cell module can be adapted to the adapter base so as to be placed flatly. At this time, by making each side end of the fastening bracket detachably connected to at least one corresponding connecting vertical piece, the square battery cell module can be clamped and fixed by the adapter base and the fastening bracket, and finally the center of gravity of the square battery cell module is stable, the shaking is reduced, and the power supply is more stable.

[0015] 2) Compared with the existing method of redesigning and opening the mold for the outer surface or bottom shell of the square battery module, the square battery module can be fixed by the above-mentioned battery group fastening structure, so that the bottom shell that originally adapted to the cylindrical battery module can also smoothly adapt to the square battery module, which can not only reduce the bottom shell inventory, but also reduce the cost of re-opening the mold. In addition, when the bottom shell needs to be re-adapted to the cylindrical battery module, it is only necessary to remove the adapter base on the bottom shell, and the cylindrical battery module can be directly installed and fixed using the fastening bracket and the bottom shell, thereby significantly improving the versatility and flexibility of the battery group fastening structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is an assembly diagram of a battery group fastening structure and a square battery cell module according to an embodiment of the present disclosure; Figure 2 It is an assembly diagram of a battery group fastening structure and a cylindrical battery cell module according to another embodiment of the present disclosure; Figure 3 for Figure 1 The battery group fastening structure and the disassembled diagram of the square battery cell module are shown; Figure 4 for Figure 1 The disassembled diagram of the fastening bracket and the square battery cell module shown; Figure 5 for Figure 1 The assembly cutaway diagram of the battery group fastening structure and the square battery cell module shown; Figure 6 This is a disassembled diagram of a bottom shell and an adapting bottom bracket in a battery group fastening structure according to another embodiment of the present disclosure; Figure 7 It is an assembly cross-sectional view of a battery group fastening structure and a square battery cell module according to another embodiment of the present disclosure; Figure 8 for Figure 7 A partial enlarged view shown in the middle.

[0018] Reference numerals: 10. Square battery cell module; 11. External busbar; 12. Square battery cell monomer; 20. Cylindrical battery cell module; 100, bottom shell; 110, adapter; 101, placement area; 200, connecting vertical piece; 210, first bolt; 201, vertical waist-shaped adjustment hole; 300, adapting base; 310, main body; 320, lifting convex part; 3210, lifting inner convex part; 3220, lifting outer convex part; 330, supporting column; 301, center breach; 400, fastening bracket; 410, middle pressing piece; 4111, conical air guide cylinder; 4112, guide seat; 4101, pressure relief and explosion-proof hole; 4102, exhaust port; 4103, compression spring; 4105, connection hole; 420, end plate; 4210, main board; 4211, positioning ear; 4204, transverse adjustment long hole; 4206, third bolt; 4212, installation platform; 4220, side piece; 4221, support and limit arm; 4201, hollow window; 4202, alignment hole; 4203, transverse waist-shaped adjustment hole; 4205, fastener; 430, locking assembly; 500, pre-tightening strap; 600, buffer spacer; 700, insulating gasket; 800, insulating cover; 900, BMS board; 910, air pressure sensor; 920, guide slider; 903, vent hole. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0022] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments: Please also read Figures 1 to 3The battery group fastening structure of one embodiment includes a bottom shell 100, at least two connecting vertical pieces 200, an adapting bottom bracket 300 and a fastening bracket 400; the bottom shell 100 has a placement area 101, and the bottom shell 100 forms an adapting portion 110 in the placement area 101, and the adapting portion 110 is used to match the cylindrical battery module 20 placed in the placement area 101; at least two connecting vertical pieces 200 are installed on the bottom shell 100 and distributed around the placement area 101; the adapting bottom bracket 300 is arranged in the placement area 101 and is adapted to Covering on the adapting portion 110; the adapting base 300 is detachably connected to the bottom shell 100, and the adapting base 300 is used to adapt to the square battery module 10; the fastening bracket 400 is used to press against the side of the square battery module 10 or the cylindrical battery module 20 away from the placement area 101, and is located between at least two connecting vertical pieces 200; each side end of the fastening bracket 400 is detachably connected to at least one corresponding connecting vertical piece 200, so as to press and fix the square battery module 10 or the cylindrical battery module 20 in the placement area 101. Specifically, the fastening bracket 400 is used to press against the side of the square battery module 10 away from the adapting base 300, and the fastening bracket 400 presses and fixes the square battery module 10 on the adapting base 300. Alternatively, the fastening bracket 400 is used to press against the side of the cylindrical battery cell module 20 away from the bottom case 100 , and the fastening bracket 400 presses and fixes the cylindrical battery cell module 20 on the adapter portion 110 of the bottom case 100 .

[0023] It can be understood that since the bottom shell 100 is formed with an adapter portion 110 in the placement area 101, when the cylindrical battery cell module 20 is placed in the placement area 101, the bottom shell 100 can match the cylindrical battery cell module 20 through the adapter portion 110 to limit and fix the cylindrical battery cell module 20, and there is no need to install an adapter base 300 on the bottom shell 100. Furthermore, since the adapting base 300 is detachably connected to the bottom shell 100, when the square battery cell module 10 needs to be adapted and installed on the bottom shell 100, the adapting base 300 can be adapted to and cover the adapting portion 110, and then the square battery cell module 10 can be adapted to the adapting base 300 so as to be placed flatly. At this time, by making each side end of the fastening bracket 400 detachably connected to at least one corresponding connecting vertical piece 200, the square battery cell module 10 can be clamped and fixed by the adapting base 300 and the fastening bracket 400, thereby finally making the center of gravity of the square battery cell module 10 stable, reducing shaking, and making the power supply more stable.

[0024] It can be understood that, compared with the existing method of redesigning and opening the mold for the outer surface of the square battery cell module 10 or the bottom shell 100, fixing the square battery cell module 10 through the above-mentioned battery group fastening structure can make the bottom shell 100 that originally adapted to the cylindrical battery cell module 20 also smoothly adapt to the square battery cell module 10, which can not only reduce the inventory of the bottom shell 100, but also reduce the cost of re-opening the mold. In addition, when the bottom shell 100 needs to be re-adapted to the cylindrical battery cell module 20, it is only necessary to remove the adapter base 300 on the bottom shell 100, and the fastening bracket 400 and the bottom shell 100 can be directly used to install and fix the cylindrical battery cell module 20, thereby significantly improving the versatility and flexibility of the battery group fastening structure.

[0025] Please also read Figure 3 and Figure 4 In some embodiments, the fastening bracket 400 includes an intermediate pressing sheet 410 and at least two end plates 420, each end plate 420 is respectively arranged opposite to a side surface of the square battery cell module 10, and is detachably connected to at least one corresponding connecting vertical sheet 200; the intermediate pressing sheet 410 is used to press against the top surface of the square battery cell module 10, and is connected to each end plate 420. It can be understood that since each end plate 420 is respectively arranged opposite to a side surface of the square battery cell module 10, after each end plate 420 is respectively connected to the intermediate pressing sheet 410 pressed on the top surface of the square battery cell module 10 and the corresponding connecting vertical sheet 200, a compact frame structure can be formed by the two end plates 420 and the intermediate pressing sheet 410 to more firmly constrain the top and surrounding sides of the square battery cell module 10. In this embodiment, the positions of the two end plates 420 are relatively arranged, so that the two ends of the intermediate pressing sheet 410 can be evenly stressed, so as to better fix the square battery cell module 10. It can also be, please refer to Figure 2 When installing the cylindrical battery module 20 , each end plate 420 is respectively arranged opposite to a side surface of the cylindrical battery module 20 ; the middle pressing sheet 410 is used to press against the cylindrical battery module 20 .

[0026] Please also read Figure 4 and Figure 5In some embodiments, the end plate 420 includes a main board portion 4210 and a side piece portion 4220 that are integrally connected; the main board portion 4210 is in contact with a side surface of the square battery cell module 10, and is detachably connected to the middle pressing plate 410; the side piece portion 4220 is bent in a direction perpendicular to the main board portion 4210 to form a support and restraint arm 4221, and the support and restraint arm 4221 is locked and connected to the connecting vertical piece 200. It can be understood that, since the main board portion 4210 and the side surface of the square cell module 10 are in contact with each other, and the side piece portion 4220 is bent in a direction perpendicular to the main board portion 4210 to form a support and restraint arm 4221, that is, the support and restraint arm 4221 is perpendicular to the plane where the main board portion 4210 is located, after the support and restraint arm 4221 is locked and connected with the connecting vertical piece 200, the force of the support and restraint arm 4221 acts perpendicularly on the main board portion 4210, so that the main board portion 4210 can pre-tighten and fix the square cell module 10, so as to facilitate the subsequent bundling of the square cell module 10. At the same time, since the support and restraint arm 4221 is locked and connected with the connecting vertical piece 200, the main board portion 4210 can be detachably connected to the middle pressing piece 410, so that the end plate 420, the connecting vertical piece 200 and the middle pressing piece 410 can be disassembled, thereby facilitating assembly and replacement. In this embodiment, the support and limiting arm 4221 and the connecting vertical sheet 200 can be connected by screws or bolts. Of course, this is only an example, and those skilled in the art can also make other choices according to their needs. Figure 2 When the cylindrical battery module 20 is installed, the main board portion 4210 and a side surface of the cylindrical battery module 20 are in contact with each other.

[0027] Please also read Figure 4 and Figure 5 In some embodiments, a hollow window 4201 is provided on the end plate 420; a portion of the end plate 420 is folded outward along the edge of the hollow window 4201 to form a positioning lug 4211; the positioning lug 4211 abuts against and locks on the supporting column 330 on the adapter base 300. It can be understood that after the end plate 420 is attached to the square battery module 10, the heat inside the square battery module 10 is easily accumulated, and the hollow window 4201 is provided on the end plate 420 for the square battery module 10 to dissipate heat. At the same time, by making the supporting column 330 on the adapter base 300 abut against the positioning lug 4211 formed by folding the end plate 420 along the edge of the hollow window 4201, the end plate 420 can be supported more stably. In this embodiment, the positioning lug 4211 can be connected to the supporting column 330 by screws or bolts. Of course, this is only an example, and those skilled in the art can also make other choices as needed.

[0028] See also Figure 3In some embodiments, a portion of the end plate 420 is bent in a direction perpendicular to the corresponding peripheral side surface of the square battery module 10 to form a mounting platform 4212; a locking assembly 430 is fixedly arranged on the mounting platform 4212, and the locking assembly 430 is used to fasten the external wires and the external busbar 11 of the square battery module 10. It can be understood that since the mounting platform 4212 is perpendicular to the corresponding peripheral side surface of the square battery module 10, the locking assembly 430 can be supported by the mounting platform 4212, and then the external wires and the external busbar 11 can be fastened by the locking assembly 430, so that the square battery module 10 can stably supply power to the external wires. In this embodiment, the locking assembly 430 includes an insulating support and a threaded locking member. The insulating support is fixedly mounted on the mounting platform 4212, and a screw hole is provided on the insulating support. The threaded locking member is used to penetrate the docking hole of the external bus 11 and the guide hole of the external wire, and is threadedly connected to the screw hole to lock and fix the external bus 11 and the external wire. Specifically, the threaded locking member is a screw or a bolt. Of course, this is only an example, and those skilled in the art can also make other choices according to needs. It can also be, please refer to Figure 2 When installing the cylindrical battery module 20, part of the end plate 420 is bent in a direction perpendicular to the corresponding peripheral side surface of the cylindrical battery module 20 to form a mounting platform 4212. The locking assembly 430 is used to fasten the external wires and the external conductive pieces of the cylindrical battery module 20.

[0029] Please also read Figure 4 and Figure 5 In some embodiments, the battery group fastening structure further includes a pre-tightening band 500, which is sleeved outside the two end plates 420. It can be understood that by sleeved outside the two end plates 420, the two end plates 420 can be more closely attached to the peripheral side of the square battery module 10 under the restraint of the pre-tightening band 500, so as to more securely fix the square battery module 10.

[0030] Please also read Figure 4 and Figure 5 In some embodiments, a pressure relief and explosion-proof hole 4101 is provided on the middle pressing sheet 410. It can be understood that, since the pressure relief and explosion-proof hole 4101 is provided on the middle pressing sheet 410, when the pressure inside the square battery cell module 10 rises sharply due to thermal runaway, overcharging or short circuit, the gas generated inside the square battery cell module 10 can be quickly released through the pressure relief and explosion-proof hole 4101 to prevent the square battery cell module 10 from exploding due to excessive pressure.

[0031] Please also read Figure 4 and Figure 5In some embodiments, the battery group fastening structure further includes a buffer spacer 600, which is used to be arranged between the intermediate pressing sheet 410 and the square battery cell module 10. It can be understood that by arranging the buffer spacer 600 between the intermediate pressing sheet 410 and the square battery cell module 10, it is possible to prevent the intermediate pressing sheet 410 from directly pressing the square battery cell module 10, which can not only reduce the occurrence of internal short circuits in the square battery cell module 10 due to excessive mechanical stress, but also adapt to the micro-expansion of the square battery cell module 10 during the charging and discharging process through the deformation of the buffer spacer 600. It can also be, please refer to Figure 2 When installing the cylindrical battery cell module 20 , the buffer spacer 600 is used to be disposed between the middle pressing sheet 410 and the cylindrical battery cell module 20 .

[0032] See also Figure 3 In some embodiments, the battery group fastening structure further includes an insulating gasket 700, which is used to be arranged between the adapting base 300 and the square battery module 10. It can be understood that in order to improve the structural strength of the adapting base 300, the adapting base 300 is usually a steel adapting base 300. By arranging the insulating gasket 700 between the adapting base 300 and the square battery module 10, the electrical conduction between the adapting base 300 and the square battery module 10 can be isolated, so that the above-mentioned square battery module 10 is safer when in use.

[0033] See also Figure 5 In some embodiments, the battery group fastening structure further includes a BMS board 900 (Battery Management System), which is mounted on the fastening bracket 400 and is used to be electrically connected to the square battery cell module 10. It can be understood that since the BMS board 900 is mounted on the fastening bracket 400 and is electrically connected to the square battery cell module 10, the square battery cell module 10 can be monitored, managed and protected by the BMS board 900 to prevent the square battery cell module 10 from being overcharged or over-discharged, which can effectively improve the safety of the square battery cell module 10. Alternatively, when installing the cylindrical battery cell module 20, the BMS board 900 is mounted on the fastening bracket 400 and is used to be electrically connected to the cylindrical battery cell module 20.

[0034] Typically, a lithium-ion square battery cell module 10 will generate flammable gases such as hydrogen during thermal runaway, overcharging or short circuit. If the concentration of the generated hydrogen is too high, it is easy to cause safety accidents such as explosions. Because the square battery cell module 10 is usually composed of multiple square battery cell monomers 12 connected in series and parallel, when hydrogen overflows slightly, it is necessary to detect each square battery cell monomer 12 one by one to determine the overflowing square battery cell monomer 12. Such an operation is cumbersome and complicated, so the entire square battery cell module 10 is usually scrapped, which will cause the good square battery cell monomers 12 in the square battery cell module 10 to be scrapped, thereby resulting in a large amount of good square battery cell monomers 12 being wasted.

[0035] To reduce the tedious testing operation or waste of good square cell monomer 12, please refer to Figure 7 and Figure 8 In one embodiment, there are multiple pressure relief and explosion-proof holes 4101, and each pressure relief and explosion-proof hole 4101 is used to be arranged opposite to the gap between two adjacent square battery cell monomers 12 in the square battery cell module 10; the BMS board 900 is arranged in parallel on the middle pressing plate 410, and an air pressure sensor 910 is installed on the BMS board 900 at a position opposite to each pressure relief and explosion-proof hole 4101, and each air pressure sensor 910 is electrically connected to the BMS board 900; a conical air guide tube 4111 is sealed on each pressure relief and explosion-proof hole 4101, and the exhaust port 4102 of each conical air guide tube 4111 is respectively abutted against the pressure measuring diaphragm of a corresponding air pressure sensor 910. It can be understood that when hydrogen slightly overflows from the square battery cell 12, the hydrogen will enter the conical gas guide tube 4111 through the gap between two adjacent square battery cell 12, and act on the pressure measuring diaphragm of the air pressure sensor 910 through the exhaust port 4102 of the conical gas guide tube 4111. Then the air pressure sensor 910 sends a pressure signal to the BMS board 900, so that the gap between two adjacent square battery cell 12 leaking gas can be accurately obtained through the BMS board 900, thereby avoiding the tediousness of overflow inspection of each square battery cell 12 one by one, and more efficiently determining the overflowing square battery cell 12, thereby reducing the occurrence of good square battery cell 12 in the square battery module 10 being scrapped. Specifically, the air pressure sensor 910 can be a diaphragm box sensor.

[0036] Furthermore, when the lithium-ion square battery module 10 continuously produces a large amount of hydrogen, a huge air pressure will be generated between the exhaust port 4102 of the conical air guide cylinder 4111 and the pressure measuring diaphragm of the air pressure sensor 910, and the pressure measuring diaphragm of the air pressure sensor 910 is easily damaged under high pressure.

[0037] In order to reduce the risk of damage to the pressure measuring diaphragm of the pressure sensor 910 due to excessive pressure, please refer to Figure 8In one embodiment, a guide slider 920 is fixedly provided at each end of the BMS board 900, and a guide seat 4112 is fixedly provided at each end of the intermediate pressing plate 410; the oblique side surface of each guide slider 920 slides against the oblique side surface of a corresponding guide seat 4112, and the bottom surface of each guide slider 920 is connected to the intermediate pressing plate 410 through a compression spring 4103; the oblique side surface of each guide slider 920 is inclined along a first inclined direction X, and the direction of the component vector of the first inclined direction X in the horizontal direction is the first straight direction Y, and the BMS board 900 respectively opens a vent 903 in the opposite direction of each air pressure sensor 910 along the first straight direction Y; when the air pressure sensor 910 moves along the first inclined direction X, the exhaust port 4102 of each conical air guide cylinder 4111 is respectively opposite to the pressure measuring diaphragm of a corresponding air pressure sensor 910 or a corresponding vent 903 on the BMS board 900. It can be understood that when a huge air pressure is generated between the exhaust port 4102 of the conical air cylinder 4111 and the pressure measuring diaphragm of the air pressure sensor 910, the air pressure can overcome the elastic force of the compression spring 4103 to make the BMS board 900 move away from the middle pressure plate 410. At this time, the air pressure sensor 910 moves along the first inclined direction X, and the exhaust port 4102 of each conical air cylinder 4111 is respectively opposite to a corresponding air vent 903, so that hydrogen can be quickly discharged through a corresponding air vent 903, ultimately reducing the pressure measuring diaphragm of the air pressure sensor 910 from being damaged due to excessive pressure.

[0038] Furthermore, after the square battery cell units 12 with overflow in the square battery cell module 10 are disassembled and removed, new square battery cell units 12 are usually not added to the original square battery cell module, but the good square battery cell units 12 in the original square battery cell module are reconnected in series and in parallel to avoid mixing new square battery cell units 12 with old square battery cell units 12, which may cause a decrease in the overall performance of the square battery cell module 10.

[0039] In order to adapt to the volume change after the square battery cell 12 overflowing from the square battery cell module 10 is disassembled and removed, please refer to Figure 7In one embodiment, a plurality of mounting positions are provided on the middle pressing plate 410, and a plurality of connecting holes 4105 are distributed along the arrangement direction of the square battery cell monomers 12 in the square battery cell module 10, and the end plate 420 can be detachably installed at any mounting position; a transverse waist-shaped adjustment hole 4203 is provided on the support and limiting arm 4221, and a vertical waist-shaped adjustment hole 201 is provided on the connecting vertical plate 200, and the first bolt 210 movably penetrates the transverse waist-shaped adjustment hole 4203 and the vertical waist-shaped adjustment hole 201, and locks the support and limiting arm 4221 and the connecting vertical plate 200 in the first position; when the support and limiting arm 4221 is located in the first position, the end plate 420 is attached to the peripheral side of the square battery cell module 10. It can be understood that when the volume of the square cell module 10 changes, the position of the first bolt 210 in the horizontal waist-shaped adjustment hole 4203 and the vertical waist-shaped adjustment hole 201 can be changed, and the end plate 420 can be detachably installed at different installation positions to adjust the vertical and horizontal movement of the end plate 420, so that it can finally fit the peripheral side of the square cell module 10 after the volume change. Specifically, the installation position is the connection hole 4105, and the end plate 420 is provided with an alignment hole 4202, and the connection hole 4105 and the alignment hole 4202 are locked and fixed by fasteners 4205.

[0040] See also Figure 7 Further, in one embodiment, a transverse adjustment slot 4204 is provided on the positioning lug 4211, the supporting column 330 is a lifting column, and the third bolt 4206 movably passes through the transverse adjustment slot 4204, and locks and fixes the positioning lug 4211 on the lifting column. It can be understood that by changing the position of the third bolt 4206 in the transverse adjustment slot 4204 and adjusting the lifting height of the lifting column, the volume change of the square battery module 10 can be further adapted, and the connection between the fastening bracket 400 and the adapting base 300 can be strengthened.

[0041] See also Figure 6 In some of the embodiments, the battery group fastening structure further includes an insulating cover sheet 800, which is used to cover the bus of the square battery cell module 10 to reduce the possibility of surrounding impurities or wiring harnesses accidentally touching the bus of the square battery cell module 10 and causing safety accidents.

[0042] See also Figure 6 In some embodiments, the adapting base 300 is screwed or snapped with at least a portion of the adapting portion 110 to be detachably connected to the bottom shell 100. It can be understood that by screwing or snapping the adapting base 300 with at least a portion of the adapting portion 110, not only can the adapting portion 110 be reused, but also the trouble of re-setting the connection structure on the bottom shell 100 is avoided, so that the bottom shell 100 can be adapted to the cylindrical battery module 20 and the adapting base 300 at the same time without any modification.

[0043] Please also read Figure 5 and Figure 6 In some embodiments, the adapting base 300 includes a main sheet 310 and a plurality of lifting protrusions 320 connected in one piece; the main sheet 310 is adapted to and covers the adapting portion 110; each lifting protrusion 320 protrudes to the same height away from the adapting portion 110, and is used to jointly abut the bottom surface of the square battery cell module 10. It can be understood that since each lifting protrusion 320 on the adapting base 300 protrudes to the same height away from the adapting portion 110, when each lifting protrusion 320 jointly abuts the bottom surface of the square battery cell module 10, the square battery cell module 10 will not interfere with the adapting portion 110, and the square battery cell module 10 can be placed flatly above the adapting portion 110 to wait for further tightening of the fastening bracket 400.

[0044] See also Figure 6 In some embodiments, the plurality of lifting protrusions 320 are divided into a plurality of lifting inner protrusions 3210 and a plurality of lifting outer protrusions 3220; a central opening 301 is provided at the central position of the main sheet body 310; the plurality of lifting inner protrusions 3210 are arranged and distributed at the two opposite inner edges of the central opening 301, and together constitute an inner support combination; the plurality of lifting outer protrusions 3220 are arranged and distributed at the two opposite outer edges of the main sheet body 310, and together constitute an outer support combination; the inner support combination is used to abut against the central position of the bottom surface of the square battery cell module 10, and the outer support combination is used to abut against the outer peripheral position of the bottom surface of the square battery cell module 10, so that the adapting base 300 can evenly support the bottom surface of the square battery cell module 10.

[0045] Please combine Figure 3 As shown, a portable power source includes a cover, a square battery module 10 and a battery group fastening structure of any of the above embodiments; the cover and the bottom shell 100 are buckled together to form a receiving cavity; the square battery module 10 is arranged in the receiving cavity and is matched with the adapting bottom bracket 300; the fastening bracket 400 is pressed against the side of the square battery module 10 away from the adapting bottom bracket 300. It can be understood that by making the square battery module 10 and the adapting bottom bracket 300 match, the square battery module 10 can be placed flatly in the receiving cavity formed by the buckling of the cover and the bottom shell 100, and then the square battery module 10 is clamped and fixed by the adapting bottom bracket 300 and the fastening bracket 400, so that the center of gravity of the square battery module 10 is stable, the shaking is reduced, and the power supply is more stable.

[0046] Compared with the prior art, the present invention has at least the following advantages: 1) Since the bottom shell 100 is formed with an adapter portion 110 in the placement area 101, when the cylindrical battery cell module 20 is placed in the placement area 101, the bottom shell 100 can match the cylindrical battery cell module 20 through the adapter portion 110 to limit and fix the cylindrical battery cell module 20, without installing an adapter base 300 on the bottom shell 100. Furthermore, since the adapting base 300 is detachably connected to the bottom shell 100, when the square battery cell module 10 needs to be adapted and installed on the bottom shell 100, the adapting base 300 can be adapted to and cover the adapting portion 110, and then the square battery cell module 10 can be adapted to the adapting base 300 so as to be placed flatly. At this time, by making each side end of the fastening bracket 400 detachably connected to at least one corresponding connecting vertical piece 200, the square battery cell module 10 can be clamped and fixed by the adapting base 300 and the fastening bracket 400, thereby finally making the center of gravity of the square battery cell module 10 stable, reducing shaking, and making the power supply more stable.

[0047] 2) Compared with the existing method of redesigning and opening the mold for the outer surface of the square battery cell module 10 or the bottom shell 100, the square battery cell module 10 is fixed by the above-mentioned battery group fastening structure, so that the bottom shell 100 that originally adapted to the cylindrical battery cell module 20 can also smoothly adapt to the square battery cell module 10, which can not only reduce the inventory of the bottom shell 100, but also reduce the cost of re-opening the mold. In addition, when the bottom shell 100 needs to be re-adapted to the cylindrical battery cell module 20, it is only necessary to remove the adapter base 300 on the bottom shell 100, and the fastening bracket 400 and the bottom shell 100 can be directly used to install and fix the cylindrical battery cell module 20, thereby significantly improving the versatility and flexibility of the battery group fastening structure.

[0048] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure shall be subject to the attached claims.

Claims

1. A battery group fastening structure, comprising: A bottom shell, wherein the bottom shell has a placement area, and the bottom shell forms an adapter portion in the placement area, and the adapter portion is used to match the cylindrical battery module placed in the placement area; At least two connecting vertical sheets, at least two of which are mounted on the bottom shell and distributed around the placement area; Characterized in that the battery group fastening structure also includes an adapting base and a fastening bracket; The adapting base is arranged in the placement area and is adapted to cover the adapting portion; the adapting base is detachably connected to the bottom shell, and the adapting base is used to adapt to the square battery cell module; the fastening bracket is used to press against the side of the square battery cell module or the cylindrical battery cell module away from the placement area, and is located between at least two of the connecting vertical sheets; each side end of the fastening bracket is detachably connected to at least one corresponding connecting vertical sheet to press and fix the square battery cell module or the cylindrical battery cell module in the placement area.

2. The battery group fastening structure according to claim 1, characterized in that: The fastening bracket includes an intermediate pressing plate and at least two end plates, each of the end plates is respectively arranged opposite to a side surface of the square battery cell module or the cylindrical battery cell module, and is detachably connected to at least one corresponding connecting vertical plate; the intermediate pressing plate is used to press against the top surface of the square battery cell module or the cylindrical battery cell module, and is connected to each of the end plates.

3. The battery group fastening structure according to claim 2, characterized in that: The end plate includes a main board portion and a side piece portion that are integrally connected; the main board portion is in contact with a side surface of the square battery cell module or the cylindrical battery cell module, and is detachably connected to the middle pressing plate; the side piece portion is bent in a direction perpendicular to the main board portion to form a support and restraint arm, and the support and restraint arm is locked and connected to the connecting vertical piece.

4. The battery group fastening structure according to claim 2, characterized in that: A hollow window is provided on the end plate; a portion of the end plate is folded outward along the edge of the hollow window to form a positioning lug; the positioning lug abuts against and is locked to the supporting column on the adapter base.

5. The battery group fastening structure according to claim 2, characterized in that: Part of the end plate is bent in a direction perpendicular to the corresponding circumferential side surface of the square battery cell module or the cylindrical battery cell module to form a mounting platform; a locking assembly is fixedly arranged on the mounting platform; the locking assembly is used to fasten the external wires and the external bus bar of the square battery cell module, or the locking assembly is used to fasten the external wires and the external conductive piece of the cylindrical battery cell module.

6. The battery group fastening structure according to claim 2, characterized in that: The battery group fastening structure further includes a pre-tightening strap, and the pre-tightening strap is sleeved outside the two end plates; and / or, The battery group fastening structure further includes a buffer spacer, which is used to be arranged between the middle pressing sheet and the square battery cell module or the cylindrical battery cell module; and / or, The battery group fastening structure also includes an insulating gasket, which is used to be arranged between the adapter base and the square battery cell module.

7. The battery group fastening structure according to claim 2, characterized in that: The battery group fastening structure also includes a BMS board, which is mounted on the fastening bracket and is used to be electrically connected to the square battery cell module or the cylindrical battery cell module.

8. The battery group fastening structure according to claim 7, characterized in that: The intermediate pressing plate is provided with a plurality of pressure relief and explosion-proof holes, each of which is used to be arranged opposite to the gap between two adjacent square battery cells in the square battery cell module; the BMS board is arranged in parallel on the intermediate pressing plate, and an air pressure sensor is installed on the BMS board at a position opposite to each of the pressure relief and explosion-proof holes, and each of the air pressure sensors is electrically connected to the BMS board respectively; a conical air guide tube is sealed on each of the pressure relief and explosion-proof holes, and the exhaust port of each of the conical air guide tubes is respectively abutted against the pressure measuring diaphragm of a corresponding air pressure sensor.

9. The battery group fastening structure according to claim 1, characterized in that: The adapter base includes a main sheet body and a plurality of lifting protrusions connected in one piece; the main sheet body is adapted to and covers the adapter part; each of the lifting protrusions protrudes to an equal height away from the adapter part, and is used to jointly support the bottom surface of the square battery module.

10. A portable power source, characterized in that: It comprises a cover shell, a square battery cell module and a battery group fastening structure as described in any one of claims 1 to 9; the cover shell and the bottom shell are interlocked to form a receiving cavity; the square battery cell module is arranged in the receiving cavity and is adapted to an adapting bottom bracket; the fastening bracket is pressed against a side of the square battery cell module away from the adapting bottom bracket.

Images