Protective shell of lithium iron phosphate battery and preparation method

Abstract

The invention is applicable to the technical field of lithium iron phosphate batteries, and provides a protective shell of a lithium iron phosphate battery and a preparation method, the protective shell comprises a main shell assembly: the top of the main shell assembly is provided with a top cover assembly, and the outer wall of the main shell assembly is provided with a limiting frame; wherein the top cover assembly comprises a top cover, and the inner wall of the top cover is fixedly connected with an inner connection circuit board; through the arrangement of an internal connection electric column piece, after the top cover is turned and locked, an internal connection circuit board is pressed downwards, and an internal connection electric column is connected with a connection electric head of a lithium iron phosphate battery in the main shell assembly, so that the connection between the plurality of lithium iron phosphate batteries and the internal connection circuit board is realized, and the connection between the plurality of lithium iron phosphate batteries and an external charging mechanism is realized; the external charging device can be connected with external power taking equipment through an external charging mechanism; and due to the arrangement of the external charging mechanism, in the use process, a wrench is wrenched and turned over, so that connection with the lithium iron phosphate battery in the main shell assembly is realized through an external electric column, and the purpose of quick connection is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium iron phosphate batteries, and in particular relates to a protective shell of a lithium iron phosphate battery and a preparation method thereof. Background Art

[0002] Lithium iron phosphate battery is a lithium-ion battery that uses lithium iron phosphate (LiFePO4) as the positive electrode material and carbon as the negative electrode material. The rated voltage of the single cell is 3.2V and the charging cut-off voltage is 3.6V~3.65V. It has the advantages of high operating voltage, high energy density, long cycle life, good safety performance, low self-discharge rate and no memory effect. When charging, some lithium ions in the lithium iron phosphate are released and transferred to the negative electrode through the electrolyte. At the same time, the positive electrode releases electrons from the external circuit to the negative electrode to maintain the balance of the chemical reaction. When discharging, lithium ions are released from the negative electrode and reach the positive electrode through the electrolyte. At the same time, the negative electrode releases electrons from the external circuit to the positive electrode to provide energy to the outside world. Existing lithium iron phosphate batteries are generally connected in series through wires to achieve connection and use. The operation is complicated, and after a failure occurs, they need to be disassembled and inspected one by one, which is time-consuming. There is leakage at the wire connection, and the safety is low.

[0003] In order to avoid the above situation, it is necessary to design a protective shell and preparation method for a lithium iron phosphate battery. Summary of the invention

[0004] The present invention provides a protective shell of a lithium iron phosphate battery and a preparation method thereof, aiming to solve the problems that the existing lithium iron phosphate batteries are generally connected in series through wires for use, the operation is complicated, and after a failure occurs, they need to be disassembled and inspected one by one, which is time-consuming, there is leakage at the wire connection, and the safety is low.

[0005] The present invention is implemented as follows: a protective shell of a lithium iron phosphate battery comprises a main shell assembly: a top cover assembly is arranged on the top of the main shell assembly, and a limiting frame is arranged on the outer wall of the main shell assembly;

[0006] The top cover assembly includes a top cover, an inner wall of the top cover is fixedly connected to an internal connection circuit board, a rubber strip is fixedly connected between the top cover and the internal connection circuit board, and inner walls on both sides of the top cover are movably connected to an external charging mechanism;

[0007] An internal electric column is arranged at the bottom of the internal connection circuit board.

[0008] Preferably, the external charging mechanism comprises a rotating shaft arranged on the inner wall of the top cover, the outer wall of the rotating shaft is movably connected with a wrench, the inner wall of the wrench is provided with two external electric posts, the inner wall of the wrench is provided with a wire, the external electric posts and the internal connection circuit board are connected by the wire, the inner wall of the wrench is provided with a plurality of insulating tension springs, one end of the insulating tension spring is fixedly connected to the outer wall of the top cover;

[0009] Among them, the outer wall of the wrench is provided with a buckle groove; through the setting of the external charging mechanism, during use, by pulling the wrench and flipping the wrench, the connection with the lithium iron phosphate battery inside the main shell assembly is achieved through the external power column, so as to achieve the purpose of quick connection.

[0010] Preferably, the internal electric post component includes an internal electric post fixedly arranged on the inner wall of the internal connecting circuit board and a protective ring plate fixedly arranged on the bottom of the internal connecting circuit board; through the setting of the internal electric post component, when the top cover flip is locked, the internal connecting circuit board is pressed down, and the internal electric post is connected to the connecting head of the lithium iron phosphate battery inside the main shell assembly, thereby realizing the connection between several lithium iron phosphate batteries and the internal connecting circuit board, thereby realizing the connection between several lithium iron phosphate batteries and the external charging mechanism, and can be connected to external power-taking equipment through the external charging mechanism, thereby improving the use effect of the device and providing convenience for users.

[0011] Preferably, a sleeve is sleeved on the bottom of the protective ring plate;

[0012] The sleeve and the protective ring plate are connected by several springs, and the bottom of the sleeve is fixedly connected with a rubber pad; through the arrangement of the sleeve, several spring connections and the protective ring plate, when the internal electric column is connected to the connecting head of the lithium iron phosphate battery inside the main shell assembly, a protective effect can be achieved around the connection point.

[0013] Preferably, the main shell assembly comprises a shell, a plurality of inner pads are fixedly connected to the inner wall of the shell, and a plurality of limiting partitions are inserted into the inner wall of the shell;

[0014] The outer wall of the limiting partition is fixedly connected with a rubber pad, and every two limiting partitions form a group, and several spring tubes are fixedly connected between the two limiting partitions in each group of limiting partitions; through the arrangement of the limiting partition and the spring tube, a better limiting effect can be achieved between the several limiting partitions in the shell, and the arrangement of the spring tube can compensate for the certain elastic deformation of the center of the limiting partition after being squeezed and then encountered shaking, thereby achieving a better support and limiting effect.

[0015] Preferably, a plurality of rear fixing seats are fixedly connected to the rear side of the shell, and the plurality of rear fixing seats are movably connected to the outer wall of the top cover via a rotation pin.

[0016] Preferably, two front fixing seats are fixedly connected to the front side of the shell, and the inner wall of the front fixing seat is threadedly connected to the outer wall of the limit frame; by rotating the limit frame, the height of the limit frame can be adjusted by lifting and lowering, so as to achieve the limit between the top end of the limit frame and the top cover, so as to achieve the purpose of locking the top cover.

[0017] Preferably, a gasket groove member is fixedly connected to the bottom of the shell, and the gasket groove member includes a groove seat, and a plurality of gasket blocks are arranged in an array at the bottom of the groove seat, and the gasket blocks are conical gasket blocks.

[0018] A method for preparing a protective shell of a lithium iron phosphate battery comprises the following steps:

[0019] S1. First, the metal sheet of the protective shell is pickled and then polished;

[0020] S2. Cutting and welding the metal sheet of the protective shell according to the size of the battery;

[0021] S3, spraying an insulating coating on the welded battery shell frame;

[0022] S4. Finally, spray protective paint on the battery shell frame.

[0023] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0024] By setting the internal electric post, when the top cover flip is locked, the internal connection circuit board is pressed down, and the internal electric post is connected to the connection head of the lithium iron phosphate battery inside the main shell assembly, so as to realize the connection between several lithium iron phosphate batteries and the internal connection circuit board, thereby realizing the connection between several lithium iron phosphate batteries and the external charging mechanism, and can be connected to the external power-taking equipment through the external charging mechanism; the setting of the external charging mechanism, during use, by turning the wrench and flipping the wrench, the connection with the lithium iron phosphate battery inside the main shell assembly is realized through the external electric post, so as to achieve the purpose of quick connection; by setting the sleeve, several spring connections and the protective ring plate, it can be realized that when the internal electric post is connected to the connection head of the lithium iron phosphate battery inside the main shell assembly, a protective effect is played on the surrounding of the connection point;

[0025] By setting the limiting baffle and the spring tube, a better limiting effect can be achieved between the several limiting baffles in the shell. The setting of the spring tube can compensate for the elastic deformation of the center of the limiting baffle after being squeezed and then shaken, thereby achieving a better supporting and limiting effect.

[0026] By rotating the limiting frame, the height of the limiting frame is adjusted by lifting and lowering, so as to achieve the limit between the top end of the limiting frame and the top of the top cover, so as to achieve the purpose of locking the top cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the front view of the present invention;

[0028] Figure 2 It is a structural schematic diagram of the top cover assembly of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the internal electric column component of the present invention;

[0030] Figure 4 It is a structural schematic diagram of the external charging mechanism of the present invention;

[0031] Figure 5 1 is a schematic structural diagram of the main housing assembly of the present invention (I);

[0032] Figure 6 is a schematic structural diagram of the main housing assembly of the present invention (II);

[0033] Figure 7 It is a structural schematic diagram of the gasket groove member of the present invention.

[0034] In the figure: 1. Main shell assembly; 101. Shell; 102. Front fixing seat; 103. Gasket groove piece; 1031. Slot seat; 1032. Cushion block; 104. Limiting partition; 105. Spring tube; 106. Rear fixing seat; 107. Inner pad; 2. Top cover assembly; 201. Top cover; 202. External charging mechanism; 2021. Wrench; 2022. Insulating tension spring; 2023. External electric post; 2024. Buckle groove; 203. Internal connecting circuit board; 204. Internal electric post piece; 2041. Internal electric post; 2042. Protective ring plate; 2043. Sleeve; 205. Rubber strip; 3. Limiting frame. DETAILED DESCRIPTION

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0036] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0037] The embodiment of the present invention provides a protective shell of a lithium iron phosphate battery and a preparation method thereof, such as Figure 1-7 As shown, it comprises a main shell assembly 1: a top cover assembly 2 is arranged on the top of the main shell assembly 1, and a limiting frame 3 is arranged on the outer wall of the main shell assembly 1;

[0038] The top cover assembly 2 includes a top cover 201, an inner wall of the top cover 201 is fixedly connected with an inner connection circuit board 203, a rubber strip 205 is fixedly connected between the top cover 201 and the inner connection circuit board 203, and the inner walls on both sides of the top cover 201 are movably connected with an external charging mechanism 202;

[0039] An internal connection electric column 204 is provided at the bottom of the internal connection circuit board 203;

[0040] The external charging mechanism 202 includes a rotating shaft arranged on the inner wall of the top cover 201, the outer wall of the rotating shaft is movably connected with a wrench 2021, the inner wall of the wrench 2021 is provided with two external electric posts 2023, the inner wall of the wrench 2021 is provided with a wire, the external electric posts 2023 and the internal connection circuit board 203 are connected by the wire, the inner wall of the wrench 2021 is provided with a plurality of insulating tension springs 2022, one end of the insulating tension spring 2022 is fixedly connected to the outer wall of the top cover 201;

[0041] The outer wall of the wrench 2021 is provided with a buckle groove 2024;

[0042] The internal connection electric post 204 includes an internal connection electric post 2041 fixedly disposed on the inner wall of the internal connection circuit board 203 and a protective ring plate 2042 fixedly disposed on the bottom of the internal connection circuit board 203 .

[0043] It should be noted that the existing lithium iron phosphate batteries are generally connected in series through wires for use, which is complicated to operate and needs to be disassembled and inspected one by one after a failure occurs, which is time-consuming, and there is leakage at the wire connections, which has low safety.

[0044] Specifically, in the present embodiment, the present scheme is mainly achieved through the setting and coordinated use of the top cover assembly 2 and the main shell assembly 1. During use, after the lithium iron phosphate batteries are placed in the main shell assembly 1 in sequence, the limit frame 3 is rotated, and the height of the limit frame 3 is adjusted by lifting and lowering. The top end of the limit frame 3 is limited by the top of the top cover 201 to lock the top cover 201. When the top cover 201 is flipped and locked, the internal connection circuit board 203 is pressed down, and the internal electric post 2041 is connected to the connection head of the lithium iron phosphate battery inside the main shell assembly 1, so as to realize the connection between several lithium iron phosphate batteries and the internal connection circuit board 203, thereby realizing the connection between several lithium iron phosphate batteries and the external charging mechanism 202, and can be connected to the external power supply equipment through the external charging mechanism 202, pull the wrench 2021, flip the wrench 2021, so as to realize the connection with the lithium iron phosphate battery inside the main shell assembly 1 through the external electric post 2023.

[0045] In this embodiment, by setting up the external charging mechanism 202, during use, by turning the wrench 2021 and flipping the wrench 2021, the connection with the lithium iron phosphate battery inside the main shell assembly 1 is achieved through the external power column 2023, so as to achieve the purpose of quick connection.

[0046] In this embodiment, through the setting of the internal electric post 204, when the top cover 201 is flipped and locked, the internal connection circuit board 203 is pressed down, and the internal electric post 2041 is connected to the connecting head of the lithium iron phosphate battery inside the main shell assembly 1, thereby realizing the connection between several lithium iron phosphate batteries and the internal connection circuit board 203, thereby realizing the connection between several lithium iron phosphate batteries and the external charging mechanism 202, and can be connected to external power-taking equipment through the external charging mechanism 202, thereby improving the use effect of the device and providing convenience for users.

[0047] In a further preferred embodiment of the present invention, Figure 1-7 As shown, the bottom of the protective ring plate 2042 is sleeved with a sleeve 2043;

[0048] The sleeve 2043 and the protective ring plate 2042 are connected via a plurality of springs, and a rubber pad is fixedly connected to the bottom of the sleeve 2043 .

[0049] In this embodiment, by setting the sleeve 2043, several spring connections and the protective ring plate 2042, when the internal electric column 2041 is connected to the connecting head of the lithium iron phosphate battery inside the main shell assembly 1, a protective effect can be achieved around the connection point.

[0050] In a further preferred embodiment of the present invention, Figure 1-7 As shown, the main housing assembly 1 includes a housing 101, a plurality of inner pads 107 are fixedly connected to the inner wall of the housing 101, and a plurality of limiting partitions 104 are inserted into the inner wall of the housing 101;

[0051] The outer wall of the limiting partition 104 is fixedly connected with a rubber pad, and every two limiting partitions 104 form a group, and a plurality of spring tubes 105 are fixedly connected between two limiting partitions 104 in each group of limiting partitions 104;

[0052] A plurality of rear fixing seats 106 are fixedly connected to the rear side of the housing 101, and the plurality of rear fixing seats 106 are movably connected to the outer wall of the top cover 201 via a rotating pin;

[0053] Two front fixing seats 102 are fixedly connected to the front side of the housing 101, and the inner wall of the front fixing seat 102 is threadedly connected to the outer wall of the limiting frame 3;

[0054] The bottom of the housing 101 is fixedly connected with a gasket groove member 103 , which includes a groove seat 1031 . A plurality of gasket blocks 1032 are arranged in an array at the bottom of the groove seat 1031 . The gasket blocks 1032 are conical gasket blocks.

[0055] In this embodiment, by setting the limiting baffle 104 and the spring tube 105, a better limiting effect can be achieved between the several limiting baffles 104 in the shell 101. The setting of the spring tube 105 can compensate for the elastic deformation of the center of the limiting baffle 104 after being squeezed and then shaken, thereby achieving a better support and limiting effect.

[0056] In this embodiment, the limiting frame 3 is rotated to adjust the height of the limiting frame 3 so as to limit the top of the limiting frame 3 and the top of the top cover 201 to achieve the purpose of locking the top cover 201.

[0057] In a further preferred embodiment of the present invention, Figure 1-7 As shown, a method for preparing a protective shell of a lithium iron phosphate battery comprises the following steps:

[0058] S1. First, the metal sheet of the protective shell is pickled and then polished;

[0059] S2. Cutting and welding the metal sheet of the protective shell according to the size of the battery;

[0060] S3, spraying an insulating coating on the welded battery shell frame;

[0061] S4. Finally, spray protective paint on the battery shell frame.

[0062] It should be noted that, for the above-mentioned embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described order of actions, because according to the present invention, some steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0063] In the several embodiments provided in the present application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely schematic, such as the division of the above-mentioned units. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be in the form of telecommunication or other forms.

[0064] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0065] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also belong to the scope of protection of the present invention.

Claims

1. A protective shell for a lithium iron phosphate battery, characterized in that: It comprises a main shell component (1): a top cover component (2) is arranged on the top of the main shell component (1), and a limiting frame (3) is arranged on the outer wall of the main shell component (1); The top cover assembly (2) comprises a top cover (201), an inner wall of the top cover (201) is fixedly connected to an internal connection circuit board (203), a rubber strip (205) is fixedly connected between the top cover (201) and the internal connection circuit board (203), and inner walls on both sides of the top cover (201) are movably connected to external charging mechanisms (202); An internal electric column (204) is provided at the bottom of the internal connection circuit board (203).

2. A protective shell for a lithium iron phosphate battery as claimed in claim 1, characterized in that: The external charging mechanism (202) comprises a rotating shaft arranged on the inner wall of the top cover (201); the outer wall of the rotating shaft is movably connected to a wrench (2021); the inner wall of the wrench (2021) is provided with two external electric posts (2023); the inner wall of the wrench (2021) is provided with a wire; the external electric posts (2023) and the internal connection circuit board (203) are connected via the wire; the inner wall of the wrench (2021) is provided with a plurality of insulating tension springs (2022); one end of the insulating tension spring (2022) is fixedly connected to the outer wall of the top cover (201); Wherein, the outer wall of the wrench (2021) is provided with a buckle groove (2024).

3. A protective shell of a lithium iron phosphate battery as claimed in claim 1, characterized in that: The internal electric post component (204) comprises an internal electric post (2041) fixedly arranged on the inner wall of the internal connection circuit board (203) and a protective ring plate (2042) fixedly arranged on the bottom of the internal connection circuit board (203).

4. A protective shell for a lithium iron phosphate battery as claimed in claim 1, characterized in that: The bottom of the protective ring plate (2042) is sleeved with a sleeve (2043); The sleeve (2043) and the protective ring plate (2042) are connected via a plurality of springs, and a rubber pad is fixedly connected to the bottom of the sleeve (2043).

5. A protective shell for a lithium iron phosphate battery as claimed in claim 1, characterized in that: The main shell assembly (1) comprises a shell (101), a plurality of inner pads (107) are fixedly connected to the inner wall of the shell (101), and a plurality of limiting partitions (104) are inserted into the inner wall of the shell (101); The outer wall of the limiting partition (104) is fixedly connected with a rubber pad, and every two limiting partitions (104) form a group, and a plurality of spring cylinders (105) are fixedly connected between two limiting partitions (104) in each group of limiting partitions (104).

6. A protective shell of a lithium iron phosphate battery as claimed in claim 5, characterized in that: A plurality of rear fixing seats (106) are fixedly connected to the rear side of the shell (101), and the plurality of rear fixing seats (106) are movably connected to the outer wall of the top cover (201) via a rotating pin.

7. A protective shell of a lithium iron phosphate battery as claimed in claim 6, characterized in that: Two front fixing seats (102) are fixedly connected to the front side of the shell (101), and the inner wall of the front fixing seat (102) is threadedly connected to the outer wall of the limiting frame (3).

8. A protective shell of a lithium iron phosphate battery as claimed in claim 6, characterized in that: A gasket groove member (103) is fixedly connected to the bottom of the shell (101), and the gasket groove member (103) comprises a groove seat (1031). A plurality of gasket blocks (1032) are arranged in an array at the bottom of the groove seat (1031), and the gasket blocks (1032) are conical gasket blocks.

9. A protective shell of a lithium iron phosphate battery according to claims 1-8, and a method for preparing the protective shell of a lithium iron phosphate battery is provided, comprising the following steps: S1. First, the metal sheet of the protective shell is pickled and then polished; S2. Cutting and welding the metal sheet of the protective shell according to the size of the battery; S3, spraying an insulating coating on the welded battery shell frame; S4. Finally, spray protective paint on the battery shell frame.

Images