A charging protection device suitable for lithium battery pack and its use method

Abstract

The present invention relates to the field of lithium battery protection technology, and in particular to a charging protection device suitable for a lithium battery pack and a method of using the same, comprising an outer protection mechanism, comprising an installation box and a box cover fixedly connected to the installation box by bolts, and heat dissipation windows are provided on the four sides of the installation box; and a heat dissipation and fire extinguishing mechanism, comprising a rotating leaf and a linkage rod, a plurality of rotating leaves are arranged in an array along the vertical direction in the heat dissipation window, rotating columns are fixedly provided at both ends of the rotating leaf, and a gear plate is fixedly provided on the free end of one of the rotating columns, a socket for sliding sleeve of the rotating column is provided on the side wall of the heat dissipation window, and a linkage groove for placing the gear plate is provided on the inner wall of the installation box on one side of the heat dissipation window in the vertical direction. In actual use, the charging protection device can perform auxiliary heat dissipation while playing a protective role, and can also play an effective role in charge and discharge protection and fire extinguishing.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery protection, and in particular to a charging protection device suitable for a lithium battery pack and a use method thereof. Background Art

[0002] Lithium battery is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and non-aqueous electrolyte solution. As a device for energy storage and supply, it is widely used in electric vehicles, car batteries and other places;

[0003] In order to facilitate placement, transportation and protection, the existing lithium battery packs are provided with a protective shell on the outside of the lithium battery packs. However, in the actual charging and discharging process, the internal temperature of the lithium battery packs will be too high. If the temperature remains high for a long time, it is easy to cause battery aging, and in serious cases, it may cause the battery to spontaneously combust or even explode. To address this problem, the existing public document CN103107299B-A protective structure for lithium batteries discloses a fireproof structure for lithium battery packs. However, on the one hand, the structure will affect the heat dissipation of the battery under normal use, and on the other hand, the structure will extinguish the fire by filling the inert medium into the protective structure, which is easy to cause damage to the battery and has a poor fire extinguishing effect.

[0004] In addition, the existing public document CN219760671U - A charging protection structure for lithium batteries discloses another structure for disconnecting the charging connection state in time when a short circuit or natural situation occurs during charging to avoid further losses, but the structure uses a hydraulic cylinder to achieve disconnection and cannot be used in lithium battery packs in all occasions;

[0005] Therefore, it is necessary to improve the prior art to solve the above-mentioned technical problems. Summary of the invention

[0006] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0007] In view of the problem that the above-mentioned existing protection devices for lithium battery packs cannot achieve both heat dissipation and fire extinguishing in actual use, a charging protection device suitable for lithium battery packs is proposed.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: a charging protection device suitable for a lithium battery pack, comprising an outer protection mechanism, including a mounting box and a box cover fixedly connected to the top of the mounting box by bolts, and heat dissipation windows are provided on the four sides of the mounting box; and a heat dissipation and fire extinguishing mechanism, including a rotating leaf and a linkage rod, a plurality of rotating leaves are arranged in an array along the vertical direction in the heat dissipation window, rotating columns are fixedly provided at both ends of the rotating leaf, and a gear plate is fixedly provided on the free end of one of the rotating columns, a socket for sliding sleeve of the rotating column is provided on the side wall of the heat dissipation window, and the upper edge of the inner wall of the mounting box on one side of the heat dissipation window A linkage groove for placing a gear plate is provided in the vertical direction, a linkage rod is placed in the linkage groove, and a plurality of teeth respectively meshing with a plurality of gear plates are provided in an array along the vertical direction on one side wall of the linkage rod, the lower ends of the four linkage rods are fixedly connected to the same connecting frame, and a first electromagnetic plate is symmetrically embedded and fixed on the inner bottom surface of the mounting box below both sides of the connecting frame; the vertical cross-section of the rotating leaf consists of a cylindrical portion and an outer convex portion symmetrically connected on both sides of the cylindrical portion, and the outer side wall of the free end of the outer convex portion is semicircular, and the maximum distance dimension of the connecting line of the two outer convex portions is equal to the spacing dimension of the rotating column axes on the two adjacent rotating leaves.

[0009] The beneficial effects of the present invention are as follows: in actual use of the protection device, the two outer protrusions on the rotating page are placed horizontally, so that there is a gap between two adjacent rotating pages. In actual use, the protection device can protect the lithium battery pack while playing a good heat dissipation role, thereby avoiding the problem of overtemperature. When the temperature of the lithium battery pack is too high and causes spontaneous combustion, the first electromagnetic plate will be energized to generate magnetism to adsorb the connecting frame, so that the connecting frame drives the linkage rod to move downward. Due to the meshing setting between the linkage rod and the gear plate, when the linkage rod moves downward, the gear plate will drive the rotating page to rotate, thereby realizing the outer protrusions on the two adjacent rotating pages to abut against each other, so as to isolate the air inside and outside the installation box, thereby effectively avoiding spontaneous combustion.

[0010] As a preferred solution of the charging protection device suitable for a lithium battery pack of the present invention, a limiting frame is also provided inside the installation box, a plurality of fixing ears are provided on the outer wall of the limiting frame, and the fixing ears are fixedly connected to the bottom surface of the installation box by bolts, and a temperature sensor is also fixedly installed on the outer wall of the limiting frame.

[0011] As a preferred solution of a charging protection device suitable for a lithium battery pack of the present invention, a controller is fixedly installed on the bottom surface of the installation box between the limit frame and the connection frame, and the controller is electrically connected to the first electromagnetic plate and the temperature sensor through conductive wires.

[0012] In order to improve the fire extinguishing effect, a further preferred scheme is made for a charging protection device suitable for a lithium battery pack of the present invention, wherein: an air storage chamber is arranged inside the rotating page, and air outlet holes connected to the air storage chamber are symmetrically opened in the middle part of the side wall of the cylindrical part, and a puncture layer is bonded at the position of the air outlet hole, and the connecting line of the two air outlet holes is perpendicular to the connecting line of the two outer convex parts; U-shaped plates are symmetrically arranged on the inner and outer sides of the heat dissipation window, and both ends of the U-shaped plate are fixedly connected to the installation box by bolts, and a side surface of the U-shaped plate close to the heat dissipation window is arranged in an array in the vertical direction with a number of second convex grooves equal to the rotating page, a T-shaped column is arranged in the second convex groove, and a pointed head is integrally formed at one end of the T-shaped column, and a second spring is arranged in the second convex groove at the other end of the T-shaped column; the pointed head is abutted against the outer wall of the rotating page at the position of the rotating track surface of the air outlet.

[0013] As a preferred solution of a charging protection device suitable for a lithium battery pack of the present invention, fire extinguishing gas is stored inside the gas storage chamber, and the gas pressure of the fire extinguishing gas is greater than the atmospheric pressure.

[0014] The beneficial effect of the present invention is that when the protective device is in use and spontaneous combustion occurs, through the setting of the second spring, as the rotating page rotates, the pointed part will move to the air outlet position and puncture the puncture layer. At this time, the fire extinguishing gas in the gas storage chamber will be sprayed out. The sprayed fire extinguishing gas will be sprayed into the inside of the installation box on the one hand, and sprayed out to the outside of the installation box on the other hand, so as to achieve the effect of diluting the air and thus extinguishing the fire. This fire extinguishing method can protect the lithium battery pack while effectively extinguishing the fire, and has good practicality.

[0015] As a preferred solution of a charging protection device suitable for a lithium battery pack of the present invention, one side of the vertical plate of the U-shaped plate is symmetrically provided with inclined surfaces at the pointed part.

[0016] In view of the problem that the existing protection device is complicated to operate and is not applicable to various occasions when it is necessary to disconnect the electrical connection in response to a short circuit or the like, another further preferred scheme is made for a charging protection device suitable for a lithium battery pack of the present invention, wherein: a middle portion of the box cover is provided with a medium-shaped through-groove, a power-off protection mechanism is arranged at the position of the medium-shaped through-groove, the power-off protection mechanism comprises an outer mounting plate, an inner mounting plate and a movable block, the outer mounting plate is fixedly connected to a position above the medium-shaped through-groove by bolts, and the inner mounting plate is fixedly connected to a position below the medium-shaped through-groove by bolts; a first convex groove is provided in the box cover on one side of the medium-shaped through-groove, and the first convex groove is used for clearance fit of the movable block, and the movable Connecting plates are symmetrically fixed on both sides of one end surface of the block, guide columns are slidably sleeved on the connecting plates, and both ends of the guide columns are fixedly connected to the inner wall of the first convex groove, a first spring is slidably sleeved on the guide column located on the inner side of the movable block, and a second electromagnetic plate is fixed on the inner end surface of the first convex groove; two first conductive columns are symmetrically fixed on the bottom surface of the outer mounting plate, and two second conductive columns are symmetrically fixed on the top surface of the inner mounting plate, and elastic metal clips are attached to the outer sides of the first and second conductive columns aligned up and down, and an installation groove for placing the elastic metal clip is opened on one side surface of the movable block, and limit strips are fixed on the upper and lower end surfaces of the installation groove inside the elastic metal clip.

[0017] The beneficial effects of the present invention are as follows: when the protection device is in use, when abnormal current occurs during charging and discharging, the second electromagnetic plate will be energized to generate magnetism to magnetically adsorb the movable block. Under the action of the magnetic adsorption, the movable block will move to the first convex groove, thereby driving the elastic metal clip to separate from the first conductive column and the second conductive column respectively to achieve circuit disconnection, thereby achieving effective charging protection and good practicality.

[0018] As a preferred solution of a charging protection device suitable for a lithium battery pack of the present invention, an electrical slot is fixedly provided on the top surface of the outer mounting plate, and the electrical slot is electrically connected to the first conductive column through a conductive line, and a conductive bolt is symmetrically spirally fitted on the bottom surface of the inner mounting plate, and one end of the conductive bolt abuts against the second conductive column.

[0019] As a preferred solution of the charging protection device suitable for a lithium battery pack of the present invention, an electrical connection groove is also fixedly provided on the bottom surface of the box cover, and the electrical connection groove and the second electromagnetic plate are electrically connected through a conductive line, and a current detection sensor is also installed on the conductive line connecting the conductive bolt and the lithium battery pack, and the current detection sensor is electrically connected to the electrical connection groove through the conductive line.

[0020] In addition, the present invention also provides the following technical solutions: a method for using a charging protection device for a lithium battery pack, wherein the charging protection device for a lithium battery pack is used according to the following specific steps;

[0021] S1: Install the limit frame on the installation box by bolts, then place the lithium battery pack in the installation box inside the limit frame, and install the temperature sensor outside the limit frame;

[0022] S2: The output end of the lithium battery pack is electrically connected to the controller through a conductive line, and the controller is electrically connected to the temperature sensor through a conductive line;

[0023] S3: Connect the conductive bolt and the lithium battery pack through a conductive line, and connect the current detection sensor in series on the conductive line;

[0024] S4: Connect the electrical connection slot and the controller through a conductive wire, and finally fix the box cover and the installation box with bolts, and then it can be used normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0026] Figure 1 The figure is a schematic diagram of the overall structure of a charging protection device suitable for a lithium battery pack in the present invention.

[0027] Figure 2 For the present invention Figure 1 A cross-sectional view of the structure in the vertical direction.

[0028] Figure 3 For the present invention Figure 1 Vertical cross-section of the structure at the linkage groove location.

[0029] Figure 4 For the present invention Figure 1 Schematic diagram of the overall structure inside the installation box in the structure.

[0030] Figure 5 This is a diagram of the installation box, the connection frame and the limit frame to be matched in the present invention.

[0031] Figure 6 It is a schematic diagram of the overall structure of the rotating page in the present invention.

[0032] Figure 7 It is a schematic diagram of the overall structure of the U-shaped plate in the present invention.

[0033] Figure 8 For the present invention Figure 1 Schematic diagram of the overall structure of the box cover in the structure.

[0034] Fig. 9 For the present invention Figure 8 A cross-sectional view of the structure in the horizontal direction.

[0035] Fig.10 For the present invention Figure 8 A cross-sectional view of the structure in the vertical direction.

[0036] Fig.11 For the present invention Figure 8 Exploded view of the structure. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0040] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included. Example 1

[0041] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , which is the first embodiment of the present invention, provides a charging protection device suitable for a lithium battery pack. When the protection device is in use, the lithium battery pack is arranged on the inner side of the outer protection mechanism 100, and the heat dissipation and fire extinguishing mechanism 200 is used to dissipate heat and extinguish the lithium battery pack.

[0042] Specifically, it includes an outer protection mechanism 100, including an installation box 101 and a box cover 102 fixedly connected to the top of the installation box 101 by bolts, and heat dissipation windows 101a are opened on the four sides of the installation box 101; and a heat dissipation fire extinguishing mechanism 200, including a rotating leaf 201 and a linkage rod 202.

[0043] A plurality of rotating pages 201 are arranged in an array along the vertical direction in the heat dissipation window 101a, and rotating columns 201d-1 are fixedly arranged at both ends of the rotating pages 201, and a gear plate 201d is fixedly arranged on the free end of one of the rotating columns 201d-1, and a socket 101a-1 for sliding sleeve of the rotating column 201d-1 is provided on the side wall of the heat dissipation window 101a, and a linkage groove 101b for placing the gear plate 201d is provided on the inner wall of the installation box 101 on one side of the heat dissipation window 101a in the vertical direction, and a linkage rod 202 is placed in the linkage groove 101b, and a plurality of teeth 202b respectively meshing with the plurality of gear plates 201d are provided in an array along the vertical direction on one side wall of the linkage rod 202, and the lower ends of the four linkage rods 202 are fixedly connected to the same connection frame 202a, and first electromagnetic plates 101c are symmetrically embedded and fixedly arranged on the inner bottom surface of the installation box 101 below both sides of the connection frame 202a;

[0044] When the above arrangement is in use, by energizing the first electromagnetic plate 101c, magnetism can be generated to magnetically adsorb the connection frame 202a, so that the connection frame 202a can be moved downward to drive the four linkage rods 202 to move downward synchronously. Because of the meshing arrangement between the gear plate 201d and the bar teeth 202b, when the linkage rod 202 moves downward, the bar teeth 202b can drive the gear plate 201d to rotate, thereby realizing the synchronous rotation of multiple rotating pages 201;

[0045] The vertical cross-section of the rotating page 201 consists of a cylindrical portion 201b and an outer protrusion 201c symmetrically connected on both sides of the cylindrical portion 201b, and the outer side wall of the free end of the outer protrusion 201c is semicircular. The maximum distance dimension of the connecting line of the two outer protrusions 201c is equal to the axial spacing dimension of the rotating column 201d-1 on the two adjacent rotating pages 201. Through this arrangement, when the rotating page 201 rotates, the outer protrusions 201c on the two adjacent rotating pages 201 abut against each other, which can play a role in isolating the inside and outside of the installation box 101.

[0046] Furthermore, a limit frame 103 is provided inside the installation box 101, and a plurality of fixing ears 103a are provided on the outer wall of the limit frame 103, and the fixing ears 103a are fixedly connected to the inner bottom surface of the installation box 101 by bolts. The limit frame 103 is provided to limit the lithium battery pack, and a temperature sensor is also fixedly installed on the outer wall of the limit frame 103. The temperature sensor is used to monitor the temperature inside the installation box 101. When the temperature is greater than a predetermined value, it can be assumed that a spontaneous combustion problem occurs; of course, in order to improve the accuracy of monitoring, infrared detection sensors and smoke detection sensors can also be added.

[0047] Furthermore, a controller 101d is fixedly installed on the inner bottom surface of the installation box 101 between the limiting frame 103 and the connecting frame 202a, and the controller 101d is electrically connected to the first electromagnetic plate 101c and the temperature sensor through conductive wires. Example 2

[0048] Reference Figure 2 , Figure 6 and Figure 7 , which is the second embodiment of the present invention, is based on the previous embodiment, except that this embodiment is proposed in order to further improve the fire extinguishing effect and avoid the failure to extinguish the fire in time due to the lag of fire detection.

[0049] Specifically, the rotating page 201 is provided with an air storage cavity 201a, and the middle part of the side wall of the cylindrical part 201b is symmetrically provided with an air outlet 201b-2 connected with the air storage cavity 201a, and a puncture layer 201b-1 is bonded at the position of the air outlet 201b-2. The puncture layer 201b-1 can be made of a material different from that of the cylindrical part 201b, such as rubber, or can be made of the same material as that of the cylindrical part 201b but with a thinner thickness. The connecting line of the two air outlets 201b-2 is vertically arranged to the connecting line of the two outer protrusions 201c, so that when the puncture layer 201b-1 is punctured, the outer protrusions 201c on the two connected rotating pages 201 abut against each other;

[0050] U-shaped plates 203 are symmetrically arranged on the inner and outer sides of the heat dissipation window 101a, and both ends of the U-shaped plate 203 are fixedly connected to the installation box 101 by bolts. A side of the U-shaped plate 203 close to the heat dissipation window 101a is provided with a second convex groove 203a in an array in the vertical direction, which is equal to the number of the rotating page 201. A T-shaped column 203b is arranged in the second convex groove 203a, and a pointed head 203b-1 is integrally formed at one end of the T-shaped column 203b. At the same time, a second spring 203c is arranged in the second convex groove 203a at the other end of the T-shaped column 203b. The setting of the second spring 203c can always provide an extrusion force to the T-shaped column 203b; the pointed head 203b-1 is abutted against the outer wall of the rotating page 201 at the position of the rotating track surface of the air outlet 201b-2; the air storage chamber 201a stores fire extinguishing gas, and the gas pressure of the fire extinguishing gas is greater than the atmospheric pressure, and the fire extinguishing gas is preferably carbon dioxide;

[0051] When the above arrangement is in use, as the rotating page 201 rotates, the pointed part 203b-1 always slides along the outer wall of the rotating page 201. Under the squeezing action of the second spring 203c, when the pointed part 203b-1 moves to the position of the air outlet 201b-2, the air outlet 201b-2 will puncture the puncture layer 201b-1 under the action of the squeezing force, so that the fire extinguishing gas in the air storage chamber 201a is discharged through the air outlet 201b-2. The discharged fire extinguishing gas is dispersed inside and outside the installation box 101, playing the role of diluting the air, thereby achieving a good fire extinguishing effect.

[0052] Furthermore, a side surface of the vertical plate of the U-shaped plate 203 is symmetrically provided with an inclined surface 203d at the pointed portion 203b-1. The setting of the inclined surface 203d can guide the discharged fire extinguishing gas so as to disperse the air from both sides of the U-shaped plate 203. Example 3

[0053] Reference Figure 5 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 , which is the third embodiment of the present invention. This embodiment is based on any of the above embodiments and takes into account different situations that may occur in lithium battery packs in order to solve the problem of fire caused by short circuit during charging and discharging. Therefore, this embodiment is proposed.

[0054] Specifically, a middle-shaped through-groove 102b is opened in the middle of the box cover 102, and a power-off protection mechanism 300 is arranged at the position of the middle-shaped through-groove 102b. The power-off protection mechanism 300 includes an outer mounting plate 301, an inner mounting plate 302 and a movable block 303. The outer mounting plate 301 is fixedly connected to the upper position of the middle-shaped through-groove 102b by bolts, and the inner mounting plate 302 is fixedly connected to the lower position of the middle-shaped through-groove 102b by bolts.

[0055] A connected first convex groove 102c is provided in the box cover 102 on one side of the middle through groove 102b, and the first convex groove 102c is used for the clearance fit of the movable block 303. Connecting plates 303b are symmetrically fixed on both sides of one end surface of the movable block 303. A guide column 102c-2 is slidably sleeved on the connecting plate 303b, and both ends of the guide column 102c-2 are fixedly connected to the inner wall of the first convex groove 102c. The setting of the guide column 102c-2 can play a role of limiting and guiding the movement of the movable block 303. A first spring 102c-3 is slidably sleeved on the guide column 102c-2 located on the inner side of the movable block 303. The setting of the first spring 102c-3 can always provide an extrusion force to the movable block 303. A second electromagnetic plate 102c-1 is fixedly provided on the inner end surface of the first convex groove 102c.

[0056] Two first conductive pillars 301b are symmetrically fixed on the bottom surface of the outer mounting plate 301, and two second conductive pillars 302b are symmetrically fixed on the top surface of the inner mounting plate 302. The outer sides of the first conductive pillars 301b and the second conductive pillars 302b aligned vertically are attached with elastic metal clips 303a. A mounting groove 303c for placing the elastic metal clip 303a is opened on one side surface of the movable block 303, and limiting strips 303c-1 are fixed on the upper and lower end surfaces of the mounting groove 303c inside the elastic metal clip 303a to limit the installation of the elastic metal clip 303a.

[0057] When the above arrangement is in use, electrical conduction between the first conductive column 301b and the second conductive column 302b can be achieved through the arrangement of the elastic metal clip 303a. When the current is abnormal, the movable block 303 can be magnetically adsorbed by controlling the second electromagnetic plate 102c-1 to be energized to generate a magnetic effect. Under the magnetic adsorption effect, the movable block 303 moves to the first convex groove 102c to achieve the separation of the elastic metal clip 303a from the first conductive column 301b and the second conductive column 302b respectively, thereby achieving the effect of powering off.

[0058] Furthermore, an electrical slot 301a is fixedly provided on the top surface of the outer mounting plate 301, and the electrical slot 301a is electrically connected to the first conductive column 301b through a conductive line. The setting of the electrical slot 301a is used to electrically connect the external AC power and the electrical components, thereby playing a role in charging and discharging. The bottom surface of the inner mounting plate 302 is symmetrically spirally fitted with conductive bolts 302a, and one end of the conductive bolts 302a is abutted on the second conductive column 302b. The setting of the conductive bolts 302a can facilitate connection with the lithium battery pack.

[0059] Furthermore, an electrical connection groove 102a is fixedly provided on the bottom surface of the box cover 102, and the electrical connection groove 102a and the second electromagnetic plate 102c-1 are electrically connected through a conductive line. A current detection sensor is also installed on the conductive line connecting the conductive bolt 302a and the lithium battery pack, and the current detection sensor is electrically connected to the electrical connection groove 102a through the conductive line. The setting of the current detection sensor can monitor the current conditions during charging and discharging, so as to transmit the monitoring signal to the controller 101d through the electrical connection groove 102a, so as to facilitate the control of the controller 101d. Example 4

[0060] This embodiment is the fourth embodiment of the present invention. This embodiment provides a method for using a charging protection device suitable for a lithium battery pack. The method is used according to the following specific steps:

[0061] S1: Install the limiting frame 103 on the installation box 101 by bolts, then place the lithium battery pack in the installation box 101 inside the limiting frame 103, and install the temperature sensor outside the limiting frame 103;

[0062] S2: The output end of the lithium battery pack is electrically connected to the controller 101d through a conductive line, and the controller 101d is electrically connected to the temperature sensor through a conductive line;

[0063] S3: Connect the conductive bolt 302a to the lithium battery pack via a conductive line, and connect a current detection sensor in series on the conductive line;

[0064] S4: Connect the electrical connection slot 102a and the controller 101d through a conductive wire, and finally fix the box cover 102 and the installation box 101 with bolts, so that it can be used normally.

[0065] In addition, it should be noted that the components not described in detail in this article are prior art.

[0066] Importantly, it should be noted that the construction and arrangement of the present application shown in a number of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, changes in orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete element may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to an alternative embodiment. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0067] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention).

[0068] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A charging protection device suitable for a lithium battery pack, characterized in that: include, The outer protection mechanism (100) comprises an installation box (101) and a box cover (102) fixedly connected to the top of the installation box (101) by bolts, wherein heat dissipation windows (101a) are provided on four sides of the installation box (101); and, The heat dissipation fire extinguishing mechanism (200) comprises a rotating leaf (201) and a linkage rod (202); a plurality of rotating leaves (201) are arranged in an array along a vertical direction in the heat dissipation window (101a); rotating columns (201d-1) are fixedly provided at both ends of the rotating leaf (201); a gear plate (201d) is fixedly provided at the free end of one of the rotating columns (201d-1); a socket (101a-1) for slidingly sleeved the rotating column (201d-1) is provided on the side wall of the heat dissipation window (101a); and a mounting box (101a-2) is provided on one side of the heat dissipation window (101a). 01) A linkage groove (101b) for placing a gear plate (201d) is provided on the inner wall in a vertical direction, a linkage rod (202) is placed in the linkage groove (101b), and a plurality of teeth (202b) respectively meshing with a plurality of gear plates (201d) are provided in an array in a vertical direction on a side wall of the linkage rod (202), the lower ends of the four linkage rods (202) are fixedly connected to the same connection frame (202a), and a first electromagnetic plate (101c) is symmetrically embedded and fixedly provided on the inner bottom surface of the installation box (101) below both sides of the connection frame (202a); The vertical cross section of the rotating page (201) is composed of a cylindrical portion (201b) and convex portions (201c) symmetrically connected to both sides of the cylindrical portion (201b), and the outer side wall of the free end of the convex portion (201c) is semicircular, and the maximum distance between the connecting lines of the two convex portions (201c) is equal to the axial distance between the rotating columns (201d-1) on the two adjacent rotating pages (201); An air storage cavity (201a) is provided inside the rotating page (201), an air outlet hole (201b-2) in communication with the air storage cavity (201a) is symmetrically provided in the middle of the side wall of the cylindrical portion (201b), a puncture layer (201b-1) is bonded to the position of the air outlet hole (201b-2), and a connecting line of the two air outlet holes (201b-2) is vertically arranged to a connecting line of the two outer convex portions (201c); U-shaped plates (203) are symmetrically arranged on both inner and outer sides of the heat dissipation window (101a), and both ends of the U-shaped plate (203) are fixedly connected to the installation box (101) by bolts; a side surface of the U-shaped plate (203) close to the heat dissipation window (101a) is provided with a second convex groove (203a) in an array in the vertical direction, the number of which is equal to the number of the rotating leaves (201); a T-shaped column (203b) is arranged in the second convex groove (203a); one end of the T-shaped column (203b) is integrally formed with a pointed portion (203b-1); and a second spring (203c) is arranged in the second convex groove (203a) at the other end of the T-shaped column (203b); The pointed portion (203b-1) abuts against the outer side wall of the rotating leaf (201) at the position of the rotating track surface of the air outlet hole (201b-2); The gas storage chamber (201a) stores fire extinguishing gas, and the gas pressure of the fire extinguishing gas is greater than the atmospheric pressure.

2. A charging protection device suitable for a lithium battery pack as claimed in claim 1, characterized in that: A limit frame (103) is also provided inside the installation box (101), a plurality of fixing ears (103a) are provided on the outer wall of the limit frame (103), and the fixing ears (103a) are fixedly connected to the inner bottom surface of the installation box (101) by bolts, and a temperature sensor is also fixedly installed on the outer wall of the limit frame (103).

3. A charging protection device suitable for a lithium battery pack as claimed in claim 2, characterized in that: A controller (101d) is fixedly mounted on the inner bottom surface of the installation box (101) between the limiting frame (103) and the connection frame (202a), and the controller (101d) is electrically connected to the first electromagnetic plate (101c) and the temperature sensor respectively through conductive wires.

4. A charging protection device suitable for a lithium battery pack as claimed in claim 3, characterized in that: One side surface of the vertical plate of the U-shaped plate (203) is symmetrically provided with an inclined surface (203d) at the pointed portion (203b-1).

5. A charging protection device suitable for a lithium battery pack as claimed in claim 1, 3 or 4, characterized in that: A middle portion of the box cover (102) is provided with a middle-shaped through-groove (102b), a power-off protection mechanism (300) is arranged at the position of the middle-shaped through-groove (102b), and the power-off protection mechanism (300) comprises an outer mounting plate (301), an inner mounting plate (302) and a movable block (303), the outer mounting plate (301) being fixedly connected to a position above the middle-shaped through-groove (102b) by means of bolts, and the inner mounting plate (302) being fixedly connected to a position below the middle-shaped through-groove (102b) by means of bolts; A first convex groove (102c) is provided in the box cover (102) on one side of the middle-shaped through groove (102b), and the first convex groove (102c) is used for clearance fit of the movable block (303); connecting plates (303b) are symmetrically fixedly provided on both sides of one end surface of the movable block (303); a guide column (102c-2) is slidably sleeved on the connecting plate (303b), and both ends of the guide column (102c-2) are fixedly connected to the inner wall of the first convex groove (102c); a first spring (102c-3) is slidably sleeved on the guide column (102c-2) located on the inner side of the movable block (303); and a second electromagnetic plate (102c-1) is fixedly provided on the inner end surface of the first convex groove (102c); Two first conductive columns (301b) are symmetrically fixedly arranged on the bottom surface of the outer mounting plate (301), and two second conductive columns (302b) are symmetrically fixedly arranged on the top surface of the inner mounting plate (302). Elastic metal clips (303a) are attached to the outer sides of the first conductive columns (301b) and the second conductive columns (302b) aligned vertically. A mounting groove (303c) for placing the elastic metal clip (303a) is provided on one side surface of the movable block (303), and limiting strips (303c-1) are fixedly arranged on the upper and lower end surfaces of the mounting groove (303c) inside the elastic metal clip (303a).

6. A charging protection device suitable for a lithium battery pack as claimed in claim 5, characterized in that: An electrical slot (301a) is fixedly provided on the top surface of the outer mounting plate (301), and the electrical slot (301a) is electrically connected to the first conductive column (301b) via a conductive line; a conductive bolt (302a) is symmetrically spirally fitted on the bottom surface of the inner mounting plate (302), and one end of the conductive bolt (302a) abuts against the second conductive column (302b).

7. A charging protection device suitable for a lithium battery pack as claimed in claim 6, characterized in that: An electrical connection groove (102a) is also fixedly provided on the bottom surface of the box cover (102), and the electrical connection groove (102a) and the second electromagnetic plate (102c-1) are electrically connected via a conductive line. A current detection sensor is also installed on the conductive line connecting the conductive bolt (302a) and the lithium battery pack, and the current detection sensor is electrically connected to the electrical connection groove (102a) via the conductive line.

8. A method for using a charging protection device for a lithium battery pack, characterized in that: The charging protection device for a lithium battery pack according to any one of claims 1 to 7 is used according to the following specific steps; S1: Mounting the limiting frame (103) on the installation box (101) by means of bolts, then placing the lithium battery pack in the installation box (101) inside the limiting frame (103), and mounting the temperature sensor on the outside of the limiting frame (103); S2: electrically connecting the output end of the lithium battery pack to the controller (101d) through a conductive line, and at the same time electrically connecting the controller (101d) to a temperature sensor through a conductive line; S3: connecting the conductive bolt (302a) and the lithium battery pack via a conductive line, and connecting a current detection sensor in series to the conductive line; S4: Connect the electrical connection slot (102a) and the controller (101d) via a conductive wire, and finally fix the box cover (102) and the installation box (101) with bolts, and then use the box normally.

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