Battery Pack Fastening Structure and Portable Power Supply

Abstract

The present disclosure provides a battery grouping fastening structure and a portable power source. The above-mentioned battery grouping fastening structure includes a bottom case, at least two connecting tabs, a matching bottom tray, and a fastening bracket; a placement area is provided on the bottom case, and an adaptation part is formed by the bottom case within the placement area, and the bottom case can be mutually matched with the cylindrical battery cell module through the adaptation part; at least two connecting tabs are installed on the bottom case and are distributed on the periphery of the placement area; the matching bottom tray is arranged within the placement area and is adaptively covered on the adaptation part; the matching bottom tray is detachably connected to the bottom case, enabling the matching bottom tray to adaptively cover the adaptation part, after which the square battery cell module can be adapted to the matching bottom tray to achieve flat placement. At this time, by detachably connecting each side end of the fastening bracket to the corresponding at least one connecting tab respectively, the square battery cell module can be jointly clamped and fixed by the matching bottom tray and the fastening bracket, ultimately making the center of gravity of the square battery cell module stable, reducing shaking, and providing more stable power supply.

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:

[0005] A battery group fastening structure, comprising:

[0006] 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;

[0007] At least two connecting vertical sheets, at least two of which are mounted on the bottom shell and distributed around the placement area;

[0008] The battery group fastening structure also includes an adapting base and a fastening bracket;

[0009] 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.

[0010] In some of these embodiments, the fastening bracket includes an intermediate pressing piece and at least two end plates. Each of the end plates is disposed opposite to a circumferential 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 piece; the intermediate pressing piece 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 end plate.

[0011] In some of these embodiments, the end plate includes a main board portion and a side piece portion integrally connected; the main board portion is in mutual fit with a circumferential side surface of the square battery cell module or the cylindrical battery cell module, and is detachably connected to the intermediate pressing piece; 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.

[0012] In some of these embodiments, a hollow window is formed in the end plate; a part 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 a supporting upright column on the adapter bottom tray.

[0013] In some of these embodiments, a 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 an installation platform; a locking assembly is fixedly arranged on the installation platform; the locking assembly is used to fasten an external wire and an external bus bar of the square battery cell module, or the locking assembly is used to fasten an external wire and an external connection piece of the cylindrical battery cell module.

[0014] In some of these embodiments, the battery grouping and fastening structure further includes a pre-tightening strap, and the pre-tightening strap is sleeved outside the two end plates; and / or,

[0015] The battery grouping and fastening structure further includes a buffer spacer, and the buffer spacer is used to be arranged between the intermediate pressing piece and the square battery cell module or the cylindrical battery cell module; and / or,

[0016] The battery grouping and fastening structure further includes an insulating gasket, and the insulating gasket is used to be arranged between the adapter bottom tray and the square battery cell module.

[0017] In some of these embodiments, the battery grouping and fastening structure further includes a BMS board, and the BMS board is installed on the fastening bracket and is used for electrically connecting to the square battery cell module or the cylindrical battery cell module.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] Compared with the prior art, the present invention has at least the following advantages:

[0022] 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.

[0023] 2) Compared with the way of redesigning and opening a mold for the outer surface or bottom case of the existing square battery cell module, fixing the square battery cell module through the above battery grouping fastening structure enables the bottom case originally adapted to the cylindrical battery cell module to also stably adapt to the square battery cell module. In this way, not only can the inventory of the bottom case be reduced, but also the cost of re-opening a mold can be decreased. In addition, when the bottom case needs to be re-adapted to the cylindrical battery cell module, only the adapted bottom support on the bottom case needs to be removed, and then the cylindrical battery cell module can be directly installed and fixed using the fastening bracket and the bottom case, thus significantly improving the versatility and flexibility of the battery grouping fastening structure. Description of the Drawings

[0024] 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 some embodiments of the present disclosure and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 Assembly drawing of the battery grouping fastening structure and the square battery cell module according to an embodiment of the present disclosure;

[0026] Figure 2 Assembly drawing of the battery grouping fastening structure and the cylindrical battery cell module according to another embodiment of the present disclosure;

[0027] Figure 3 For Figure 1 Exploded view of the battery grouping fastening structure and the square battery cell module shown;

[0028] Figure 4 For Figure 1 Exploded view of the fastening bracket and the square battery cell module shown;

[0029] Figure 5 For Figure 1 Sectional assembly view of the battery grouping fastening structure and the square battery cell module shown;

[0030] Figure 6 Exploded view of the bottom case and the adapted bottom support in the battery grouping fastening structure according to another embodiment of the present disclosure;

[0031] Figure 7 Sectional view of the assembly of the battery grouping fastening structure and the square battery cell module according to yet another embodiment of the present disclosure;

[0032] Figure 8 For Figure 7 Partial enlarged view shown at A in

[0033] Reference Signs:

[0034] 10. Square battery cell module; 11. External bus bar; 12. Square battery cell unit; 20. Cylindrical battery cell module;

[0035] 100. Bottom case; 110. Adaptation part; 101. Placement area;

[0036] 200. Connecting vertical piece; 210. First bolt; 201. Vertical kidney-shaped adjustment hole;

[0037] 300. Adaptation bottom support; 310. Main piece body; 320. Lifting convex part; 3210. Inner lifting convex part; 3220. Outer lifting convex part; 330. Supporting column; 301. Central break;

[0038] 400. Fastening bracket; 410. Intermediate pressing piece; 4111. Conical air guide cylinder; 4112. Guide seat; 4101. Pressure relief and explosion-proof hole; 4102. Exhaust port; 4103. Compression spring; 4105. Connecting hole; 420. End plate; 4210. Main board part; 4211. Positioning hanging ear; 4204. Horizontal adjustment long hole; 4206. Third bolt; 4212. Installation platform; 4220. Side piece part; 4221. Support and restraint arm; 4201. Hollow window; 4202. Alignment connection hole; 4203. Horizontal kidney-shaped adjustment hole; 4205. Fastening piece; 430. Locking component;

[0039] 500. Pre-tightening strap; 600. Buffer spacer; 700. Insulating gasket; 800. Insulating cover piece; 900. BMS board; 910. Air pressure sensor; 920. Guide slider; 903. Vent hole. Detailed implementation mode

[0040] For the convenience of understanding the present disclosure, the present disclosure will be described more comprehensively 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 content of the present disclosure understood more thoroughly and comprehensively.

[0041] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate 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 embodiments.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this disclosure belongs. The terms used in the description of this disclosure herein are for the purpose of describing specific embodiments only and are not intended to limit this disclosure. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0043] To better understand the technical solutions and beneficial effects of this disclosure, the following provides a more detailed description of this disclosure in conjunction with specific embodiments:

[0044] Please refer to Figures 1 to 3 , the battery module fastening structure of an embodiment includes a bottom case 100, at least two connecting tabs 200, a matching base 300, and a fastening bracket 400; a placement area 101 is provided on the bottom case 100, and an adapting portion 110 is formed in the placement area 101 of the bottom case 100 for matching with the cylindrical battery cell module 20 placed in the placement area 101; at least two connecting tabs 200 are installed on the bottom case 100 and are distributed around the circumference of the placement area 101; the matching base 300 is arranged in the placement area 101 and is adapted to cover the adapting portion 110; the matching base 300 is detachably connected to the bottom case 100 and is used for matching with the square battery cell module 10; the fastening bracket 400 is used to press against one side of the square battery cell module 10 or the cylindrical battery cell module 20 facing away from the placement area 101 and is located between at least two connecting tabs 200; each side end of the fastening bracket 400 is respectively detachably connected to the corresponding at least one connecting tab 200 to press and fix the square battery cell module 10 or the cylindrical battery cell module 20 in the placement area 101. Specifically, the fastening bracket 400 is used to press against one side of the square battery cell module 10 facing away from the matching base 300, and the fastening bracket 400 presses and fixes the square battery cell module 10 on the matching base 300. Alternatively, the fastening bracket 400 is used to press against one side of the cylindrical battery cell module 20 facing away from the bottom case 100, and the fastening bracket 400 presses and fixes the cylindrical battery cell module 20 on the adapting portion 110 of the bottom case 100.

[0045] It can be understood that since the bottom case 100 is formed with an adaptation portion 110 within the placement area 101, when the cylindrical battery cell module 20 is placed within the placement area 101, the bottom case 100 can be mutually matched with the cylindrical battery cell module 20 through the adaptation portion 110 to limit and fix the cylindrical battery cell module 20, without the need to install an adaptation base 300 on the bottom case 100. Also, since the adaptation base 300 and the bottom case 100 are detachably connected, when a square battery cell module 10 needs to be adaptively installed on the bottom case 100, the adaptation base 300 can be made to adapt to and cover the adaptation portion 110. After that, the square battery cell module 10 can be adapted to the adaptation base 300 to achieve a flat placement. At this time, by detachably connecting each side end of the fastening bracket 400 to the corresponding at least one connecting tab 200 respectively, the square battery cell module 10 can be clamped and fixed jointly by the adaptation base 300 and the fastening bracket 400, ultimately making the center of gravity of the square battery cell module 10 stable, reducing shaking, and making the power supply more stable.

[0046] It can be understood that compared with the existing method of redesigning and opening a mold for the outer surface or the bottom case 100 of the square battery cell module 10, by fixing the square battery cell module 10 through the above battery grouping fastening structure, the bottom case 100 originally adapted to the cylindrical battery cell module 20 can also stably adapt to the square battery cell module 10. In this way, not only can the inventory of the bottom case 100 be reduced, but also the cost of re-opening a mold can be decreased. In addition, when the bottom case 100 needs to be re-adapted to the cylindrical battery cell module 20, only the adaptation base 300 on the bottom case 100 needs to be removed, and then the cylindrical battery cell module 20 can be directly installed and fixed using the fastening bracket 400 and the bottom case 100, thereby significantly improving the versatility and flexibility of the battery grouping fastening structure.

[0047] Please refer to Figure 3 With Figure 4 , in some embodiments, the fastening bracket 400 includes an intermediate pressing piece 410 and at least two end plates 420. Each end plate 420 is respectively disposed opposite to a side surface of the square battery cell module 10 in a circumferential direction and is detachably connected to the corresponding at least one connecting tab 200; the intermediate pressing piece 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 disposed opposite to a side surface of the square battery cell module 10 in a circumferential direction, after each end plate 420 is respectively connected to and presses on the intermediate pressing piece 410 on the top surface of the square battery cell module 10 and the corresponding connecting tab 200, a compact frame structure can be formed by the two end plates 420 and the intermediate pressing piece 410 to more firmly constrain the top and the circumferential sides of the square battery cell module 10. In this embodiment, the positions of the two end plates 420 are relatively disposed, which can make the two ends of the intermediate pressing piece 410 receive uniform forces to better fix the square battery cell module 10. It can also be, please refer to Figure 2, when installing the cylindrical battery cell module 20, each end plate 420 is respectively disposed opposite to the side surface of the cylindrical battery cell module 20 in a circle; the middle pressing piece 410 is used to press against the cylindrical battery cell module 20.

[0048] Please refer to Figure 4 and Figure 5 , in 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 attached to the side surface of the square battery cell module 10 in a circle and is detachably connected to the middle pressing piece 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 upright piece 200. It can be understood that since the main board portion 4210 is attached to the side surface of the square battery cell module 10 in a circle, and the side piece portion 4220 is bent in a direction perpendicular to the main board portion 4210 to form the 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 to the connecting upright piece 200, the force on the support and restraint arm 4221 acts vertically on the main board portion 4210, so that the main board portion 4210 can pre-tighten and fix the square battery cell module 10, facilitating the subsequent operation of bundling the square battery cell module 10. At the same time, since the support and restraint arm 4221 is locked and connected to the connecting upright piece 200 and the main board portion 4210 is detachably connected to the middle pressing piece 410, the end plate 420, the connecting upright piece 200 and the middle pressing piece 410 can be disassembled, which is convenient for assembly and replacement. In this embodiment, the support and restraint arm 4221 and the connecting upright piece 200 can be connected by screws or bolts. Of course, this is only an example here, and those skilled in the art can also make other selections according to needs. It can also be, please refer to Figure 2 , when installing the cylindrical battery cell module 20, the main board portion 4210 is attached to the side surface of the cylindrical battery cell module 20 in a circle.

[0049] Please refer to Figure 4 and Figure 5, in some embodiments, a hollow window 4201 is formed on the end plate 420; a part 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 is locked to the support column 330 on the adapter base 300. It can be understood that after the end plate 420 is attached to the square battery cell module 10, the heat inside the square battery cell module 10 is likely to accumulate. By forming the hollow window 4201 on the end plate 420, heat dissipation for the square battery cell module 10 is provided. At the same time, by making the support 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 more stably supported. In this embodiment, the positioning lug 4211 can be connected to the support column 330 by screws or bolts. Of course, this is only an example here, and those skilled in the art can also make other selections according to needs.

[0050] Please refer to Figure 3 , in some embodiments, a part of the end plate 420 is bent in a direction perpendicular to the corresponding peripheral side surface of the square battery cell module 10 to form an installation platform 4212; a locking assembly 430 is fixedly arranged on the installation platform 4212, and the locking assembly 430 is used for fastening the external wire and the external bus bar 11 of the square battery cell module 10. It can be understood that since the installation platform 4212 is perpendicular to the corresponding peripheral side surface of the square battery cell module 10, the locking assembly 430 can be supported by the installation platform 4212. Furthermore, the external wire and the external bus bar 11 can be fastened by the locking assembly 430, so that the square battery cell module 10 can stably supply power to the external wire. In this embodiment, the locking assembly 430 includes an insulating support and a threaded locking member. The insulating support is fixedly installed on the installation platform 4212, and a threaded hole is formed in the insulating support; the threaded locking member is used to pass through the docking hole of the external bus bar 11 and the connection hole of the external wire and is threadedly connected to the threaded hole to lock and fix the external bus bar 11 and the external wire. Specifically, the threaded locking member is a screw or a bolt. Of course, this is only an example here, and those skilled in the art can also make other selections according to needs. It can also be, please refer to Figure 2 , when installing the cylindrical battery cell module 20, a part of the end plate 420 is bent in a direction perpendicular to the corresponding peripheral side surface of the cylindrical battery cell module 20 to form an installation platform 4212, and the locking assembly 430 is used for fastening the external wire and the external connection piece of the cylindrical battery cell module 20.

[0051] Please refer to together Figure 4 and Figure 5, in some embodiments, the battery pack fastening structure further includes a pre-tightening strap 500, and the pre-tightening strap 500 is sleeved outside the two end plates 420. It can be understood that by sleeving the pre-tightening strap 500 outside the two end plates 420, the two end plates 420 can be made to fit more closely to the peripheral side of the square battery cell module 10 under the restraint of the pre-tightening strap 500, so as to fix the square battery cell module 10 more securely.

[0052] Please refer to Figure 4 and Figure 5 , in some embodiments, a pressure relief and explosion-proof hole 4101 is formed in the intermediate pressing sheet 410. It can be understood that since the pressure relief and explosion-proof hole 4101 is formed in the intermediate 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, preventing the square battery cell module 10 from exploding due to excessive pressure.

[0053] Please refer to Figure 4 and Figure 5 , in some embodiments, the battery pack fastening structure further includes a buffer spacer 600, and the buffer spacer 600 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, the intermediate pressing sheet 410 can be prevented from directly pressing on the square battery cell module 10, which can not only reduce the occurrence of internal short circuit of 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 charge and discharge 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 arranged between the intermediate pressing sheet 410 and the cylindrical battery cell module 20.

[0054] Please refer to Figure 3 , in some embodiments, the battery pack fastening structure further includes an insulating gasket 700, and the insulating gasket 700 is used to be arranged between the adapter bottom bracket 300 and the square battery cell module 10. It can be understood that in order to improve the structural strength of the adapter bottom bracket 300, the adapter bottom bracket 300 is usually a steel adapter bottom bracket 300. By arranging the insulating gasket 700 between the adapter bottom bracket 300 and the square battery cell module 10, the electrical conduction between the adapter bottom bracket 300 and the square battery cell module 10 can be isolated, making the above-mentioned square battery cell module 10 safer to use.

[0055] Please refer to Figure 5, in some embodiments, the battery pack fastening structure further includes a BMS board 900 (Battery Management System board), and the BMS board 900 is installed on the fastening bracket 400 and is used for electrically connecting to the prismatic cell module 10. It can be understood that since the BMS board 900 is installed on the fastening bracket 400 and is kept electrically connected to the prismatic cell module 10, the prismatic cell module 10 can be monitored, managed, and protected through the BMS board 900, preventing the prismatic cell module 10 from overcharging or over-discharging, and effectively improving the use safety of the prismatic cell module 10. It can also be that when installing the cylindrical cell module 20, the BMS board 900 is installed on the fastening bracket 400 and is used for electrically connecting to the cylindrical cell module 20.

[0056] Generally, during the thermal runaway, overcharging, or short-circuit of the lithium-ion prismatic cell module 10, flammable gases such as hydrogen will be generated. If the concentration of the generated hydrogen is too high, it is likely to trigger safety accidents such as explosions. Also, since the prismatic cell module 10 is usually formed by connecting multiple prismatic cell monomers 12 in series and parallel, when hydrogen leaks slightly, it is necessary to detect each prismatic cell monomer 12 one by one to determine the leaking prismatic cell monomer 12. Such operation is cumbersome and complex, so usually the entire prismatic cell module 10 will be scrapped, which will also cause the good prismatic cell monomers 12 in the prismatic cell module 10 to be scrapped, resulting in a large waste of good prismatic cell monomers 12.

[0057] To reduce the cumbersome detection operation or the waste of good prismatic cell monomers 12, please refer to Figure 7 and Figure 8, in one embodiment, the number of pressure relief explosion - proof holes 4101 is multiple, and each pressure relief explosion - proof hole 4101 is arranged opposite to the gap between two adjacent square battery cells 12 in the square battery cell module 10; the BMS board 900 is arranged parallel to the intermediate pressing sheet 410, and a pressure sensor 910 is installed on the BMS board 900 at a position opposite to each pressure relief explosion - proof hole 4101, and each pressure sensor 910 is electrically connected to the BMS board 900 respectively; a conical air guide cylinder 4111 is hermetically covered on each pressure relief explosion - proof hole 4101, and the exhaust ports 4102 of the conical air guide cylinders 4111 are respectively abutted against the pressure - measuring diaphragms of a corresponding pressure sensor 910. It can be understood that when hydrogen slightly overflows from the square battery cell 12, the hydrogen will enter the conical air guide cylinder 4111 through the gap between two adjacent square battery cells 12, and act on the pressure - measuring diaphragm of the pressure sensor 910 through the exhaust port 4102 of the conical air guide cylinder 4111. Then the pressure sensor 910 sends the pressure - receiving signal to the BMS board 900, so that the gap between the two adjacent square battery cells 12 of the leaked gas can be accurately obtained through the BMS board 900, thereby avoiding the cumbersome process of checking the gas overflow of each square battery cell 12 one by one, being able to more efficiently determine the square battery cell 12 with gas overflow, and further reducing the situation where the good square battery cells 12 in the square battery cell module 10 are scrapped. Specifically, the pressure sensor 910 can be a diaphragm sensor.

[0058] Furthermore, when the lithium - ion square battery cell module 10 continuously generates a large amount of hydrogen, a huge air pressure will be formed between the exhaust port 4102 of the conical air guide cylinder 4111 and the pressure - measuring diaphragm of the pressure sensor 910, and the pressure - measuring diaphragm of the pressure sensor 910 is likely to be damaged under the large pressure.

[0059] To reduce the occurrence of the situation where the pressure - measuring diaphragm of the pressure sensor 910 is damaged due to excessive pressure, please refer to Figure 8, in one embodiment, a guiding slider 920 is fixedly provided at each end of the BMS board 900, and a guiding seat 4112 is fixedly provided at each end of the middle pressing sheet 410; the inclined side surface of each guiding slider 920 is in sliding contact with the inclined side surface of a corresponding guiding seat 4112, and the bottom surface of each guiding slider 920 is connected to the middle pressing sheet 410 through a compression spring 4103; the inclined side surface of each guiding 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 a first straight direction Y. An air vent 903 is respectively opened on the BMS board 900 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 guiding cylinder 4111 is respectively opposite to the pressure measuring diaphragm of a corresponding air pressure sensor 910 or the position of a corresponding air vent 903 on the BMS board 900. It can be understood that when a huge air pressure is formed between the exhaust port 4102 of the conical air guiding 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 pressing sheet 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 guiding cylinder 4111 is respectively opposite to the position of a corresponding air vent 903, so that hydrogen can be quickly discharged through a corresponding air vent 903, and finally the situation that the pressure measuring diaphragm of the air pressure sensor 910 is damaged due to excessive pressure is reduced.

[0060] Further, after the leaking square battery cell 12 in the square battery cell module 10 is disassembled and removed, usually a brand-new square battery cell 12 will not be added to the original square battery cell module, but the good square battery cells 12 in the original square battery cell module will be re-connected in series and parallel to avoid the overall performance decline of the square battery cell module 10 caused by the mixed use of new square battery cells 12 and old square battery cells 12.

[0061] To adapt to the volume change after the leaking square battery cell 12 in the square battery cell module 10 is disassembled and removed, please refer to Figure 7, in one embodiment, a plurality of mounting positions are provided on the middle pressing sheet 410, and a plurality of connecting holes 4105 are distributed along the arrangement direction of the square battery cells 12 in the square battery cell module 10. The end plate 420 is detachably mounted at any one of the mounting positions; a horizontally elongated adjustment hole 4203 is formed in the support and restraint arm 4221, and a vertically elongated adjustment hole 201 is formed in the connecting vertical piece 200. The first bolt 210 movably penetrates through the horizontally elongated adjustment hole 4203 and the vertically elongated adjustment hole 201, and locks and fixes the support and restraint arm 4221 and the connecting vertical piece 200 at the first position; when the support and restraint arm 4221 is at the first position, the end plate 420 fits against the peripheral side surface of the square battery cell module 10. It can be understood that when the volume of the square battery cell module 10 changes, the position of the first bolt 210 in the horizontally elongated adjustment hole 4203 and the vertically elongated adjustment hole 201 can be changed, and at the same time, by detachably mounting the end plate 420 at different mounting positions, the movement of the end plate 420 in the vertical and horizontal directions can be jointly adjusted, and finally it can fit against the peripheral side surface of the square battery cell module 10 with the changed volume. Specifically, the mounting position is the connecting hole 4105, a mating connection hole 4202 is formed on the end plate 420, and the connecting hole 4105 and the mating connection hole 4202 are locked and fixed by a fastener 4205.

[0062] Please refer to Figure 7 , further, in one embodiment, a horizontally elongated adjustment hole 4204 is formed in the positioning hanging ear 4211, the supporting upright column 330 is a lifting column, and the third bolt 4206 movably penetrates through the horizontally elongated adjustment hole 4204 and locks and fixes the positioning hanging ear 4211 on the lifting column. It can be understood that the position of the third bolt 4206 in the horizontally elongated adjustment hole 4204 can be changed, and the lifting height of the lifting column can be adjusted to further adapt to the volume change of the square battery cell module 10 and strengthen the connection between the fastening bracket 400 and the adapter base 300.

[0063] Please refer to Figure 6 , in some embodiments, the battery grouping fastening structure further includes an insulating cover sheet 800, and the insulating cover sheet 800 is used to cover the bus bar of the square battery cell module 10 to reduce the risk of surrounding impurities or wire harnesses accidentally touching the bus bar of the square battery cell module 10 and causing safety accidents.

[0064] Please refer to Figure 6 , in some embodiments, the adapter base 300 is screwed or clamped to at least a part of the adapter portion 110 to be detachably connected to the bottom case 100. It can be understood that by screwing or clamping the adapter base 300 to at least a part of the adapter portion 110, not only can the adapter portion 110 be reused, but also the trouble of resetting the connection structure on the bottom case 100 can be avoided, so that the bottom case 100 can adapt to both the cylindrical battery cell module 20 and the adapter base 300 without any modification.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] Compared with the prior art, the present invention has at least the following advantages:

[0069] 1) Since the bottom case 100 is formed with an adaptation part 110 in the placement area 101, when the cylindrical battery cell module 20 is placed in the placement area 101, the bottom case 100 can be matched with the cylindrical battery cell module 20 through the adaptation part 110 to limit and fix the cylindrical battery cell module 20, and there is no need to install an adaptation bottom tray 300 on the bottom case 100. Also, since the adaptation bottom tray 300 and the bottom case 100 are detachably connected, when a square battery cell module 10 needs to be adaptively installed on the bottom case 100, the adaptation bottom tray 300 can be made to adapt to and cover the adaptation part 110. Then, the square battery cell module 10 can be adapted to the adaptation bottom tray 300 to achieve a flat placement. At this time, by detachably connecting each side end of the fastening bracket 400 to at least one corresponding connecting tab 200 respectively, the square battery cell module 10 can be clamped and fixed jointly by the adaptation bottom tray 300 and the fastening bracket 400, finally making the center of gravity of the square battery cell module 10 stable, reducing shaking, and making the power supply more stable.

[0070] 2) Compared with the existing method of re - designing and opening a mold for the outer surface or the bottom case 100 of the square battery cell module 10, fixing the square battery cell module 10 through the above - mentioned battery - forming fastening structure can enable the bottom case 100 originally adapted to the cylindrical battery cell module 20 to also stably adapt to the square battery cell module 10. In this way, not only can the inventory of the bottom case 100 be reduced, but also the cost of re - opening a mold can be decreased. In addition, when the bottom case 100 needs to be re - adapted to the cylindrical battery cell module 20, only the adaptation bottom tray 300 on the bottom case 100 needs to be removed, and then the cylindrical battery cell module 20 can be directly installed and fixed using the fastening bracket 400 and the bottom case 100, thus significantly improving the versatility and flexibility of the battery - forming fastening structure.

[0071] The above - mentioned embodiments only represent several implementation manners of the present disclosure. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present disclosure, several deformations and improvements can still be made, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure patent should be subject to the appended 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 module; the fastening bracket is used to press against the side of the square battery module or the cylindrical battery 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, so as to press and fix the square battery module or the cylindrical battery module in the placement area; 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; the positions of the two end plates are arranged opposite to each other.

2. The battery pack fastening structure according to claim 1, 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.

3. The battery pack fastening structure according to claim 1, 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.

4. The battery pack fastening structure according to claim 1, 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.

5. The battery pack fastening structure according to claim 1, wherein, 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.

6. The battery pack fastening structure according to claim 1, wherein 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.

7. The battery pack fastening structure according to claim 6, 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.

8. The battery pack fastening structure according to claim 1, wherein, 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.

9. A portable power supply, 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 8; 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 base; the fastening bracket is pressed against a side of the square battery cell module that is away from the adapting base.

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