Lithium primary and secondary composite power supply

Abstract

The invention discloses a lithium primary and secondary composite power supply, which comprises a shell, an end cover and a battery module, wherein the battery module is arranged in a closed hollow cavity enclosed by the shell and the end cover; the battery module comprises a battery main body, a PCB (Printed Circuit Board) and a BMS (Battery Management System); the battery main body comprises a plurality of lithium primary batteries and lithium secondary batteries, and the lithium primary batteries and the lithium secondary batteries are alternately attached and arranged; all the lithium primary batteries are connected in series through the PCB to form a lithium primary battery branch; all the lithium secondary batteries are connected in series through the PCB to form a lithium secondary battery branch; the lithium primary battery branch and the lithium secondary battery branch are connected in parallel to form a lithium primary and secondary composite power supply; and the BMS board is connected with the PCB and is used for adjusting and controlling the voltage of the lithium primary battery branch and the lithium secondary battery branch. The lithium primary and secondary composite power supply provided by the invention has the advantages of low cost, high specific energy and high safety performance.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and more particularly to a lithium primary and secondary composite power source. Background Art

[0002] As a new generation of clean and renewable energy system, lithium batteries have the advantages of high energy density and no pollution, and have become the focus of energy research. With the rapid development of science and technology, the application of lithium batteries is further penetrating into military, aerospace and other technical fields, such as drones, torpedoes, deep-sea submersibles (UUVs) and other equipment. Electronicization, informatization, and remote control in the military field are the general trend of future development, and power supply is the key technology to achieve the goal. In order to extend the mission time and increase the mission intensity, the demand for power supply energy is also increasing. At the same time, this type of equipment is also developing in the direction of lightweight and miniaturization. Its load capacity and space are limited, so the performance requirements can only be met by increasing the specific energy of the power supply.

[0003] Currently, due to the limitation of positive and negative electrode material systems, the specific energy of lithium secondary batteries on the market has basically reached a bottleneck (≤300Wh / kg). Moreover, lithium secondary batteries have problems such as low capacity and severe attenuation when used at low temperatures.

[0004] Although lithium primary batteries have higher specific energy than lithium secondary batteries (lithium fluoride carbon batteries have a theoretical specific energy of up to 2160Wh / kg, and can actually reach 700-1000Wh / kg, which is several times that of lithium secondary batteries), lithium primary batteries are expensive in materials and cannot be recharged after discharge, so the overall cost of use is much higher than that of lithium secondary batteries. In addition, lithium primary batteries also have the characteristic of high heat generation during discharge, and if they are densely arranged in the power supply, there may be a safety hazard of thermal runaway.

[0005] Therefore, how to provide a power supply with low cost, high specific energy and high safety performance is a problem that those skilled in the art need to solve urgently. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a lithium primary and secondary composite power source.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A lithium primary and secondary composite power source, comprising a shell, an end cover and a battery module; wherein the battery module is arranged in a closed hollow cavity surrounded by the shell and the end cover;

[0009] The battery module includes a battery body, a PCB board and a BMS board;

[0010] The battery body includes a plurality of lithium primary batteries and lithium secondary batteries, wherein the lithium primary batteries and the lithium secondary batteries are alternately laminated and arranged;

[0011] All lithium primary batteries are connected in series through the PCB board to form a lithium primary battery branch;

[0012] All lithium secondary batteries are connected in series through the PCB board to form a lithium secondary battery branch;

[0013] The lithium primary battery branch and the lithium secondary battery branch are connected in parallel to form a lithium primary and secondary composite power source;

[0014] The BMS board is connected to the PCB board and is used to adjust and control the voltage of the lithium primary battery branch and the lithium secondary battery branch.

[0015] Preferably, the lithium primary and secondary composite power source further comprises a first PC board and a second PC board disposed in the closed hollow cavity;

[0016] One side of the first PC board is fixedly connected to the end cover; the other side is fixed with a spring at a location corresponding to each lithium primary battery;

[0017] The second PC board is fixedly connected to the housing.

[0018] Preferably, the positive and negative terminals of each lithium primary battery are pluggably connected to the corresponding primary battery connection points on the PCB board;

[0019] The pole lug of each lithium secondary battery is fixedly connected to the corresponding secondary battery connection point on the PCB board.

[0020] Preferably, the primary battery connection is a metal contact in the shape of a groove; the positive and negative terminals of each lithium primary battery are pluggably connected to the corresponding metal contact;

[0021] The secondary battery connection is in an open shape and is attached with a metal bar; the pole ear of each lithium secondary battery is welded together with its corresponding metal bar.

[0022] Preferably, the capacity of the lithium primary battery and the lithium secondary battery is the same.

[0023] Preferably, the lithium primary battery and the lithium secondary battery are identical in length and width.

[0024] Preferably, the BMS board is provided with a lithium primary battery anti-recoil device.

[0025] Preferably, a connector is provided on the housing, and the connector is used for the discharge output of the lithium primary and secondary composite power source and for charging the lithium secondary battery.

[0026] Preferably, the lithium primary battery is a lithium carbon fluoride battery; and the lithium secondary battery is a lithium iron phosphate or a ternary lithium battery.

[0027] Preferably, the lithium primary battery is a square hard shell structure; and the lithium secondary battery is a square soft package structure.

[0028] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a lithium primary and secondary composite power source, which can achieve the following beneficial technical effects:

[0029] 1) The composite power supply of the present invention effectively solves the problem of low specific energy of lithium secondary batteries by adding high specific energy lithium primary batteries, thereby improving the working endurance of electrical appliances.

[0030] 2) The intermittent arrangement of the lithium primary battery and the lithium secondary battery of the present invention avoids the problem of high heat generation due to the aggregation of the lithium primary batteries, reduces the risk of thermal runaway, and improves safety.

[0031] 3) In a low temperature environment, the present invention can utilize the high heat generated by the lithium primary battery to conduct heat to the lithium secondary battery, so as to improve the energy efficiency of the lithium secondary battery (i.e., solve the problems of low storage capacity and severe attenuation of the lithium secondary battery when used at low temperatures);

[0032] 4) The present invention utilizes lithium primary batteries to ensure high specific energy, and at the same time utilizes the characteristics of lithium secondary batteries that they can be recycled and made of inexpensive materials, thereby reducing the cost of using the overall composite power source. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0034] Figure 1 An exploded structural diagram of a lithium primary and secondary composite power source provided by the present invention;

[0035] Figure 2 A schematic diagram of the arrangement of a battery body provided in one embodiment of the present invention;

[0036] Figure 3 The figure is a schematic diagram of the structure of a PCB board and a BMS board provided in a certain embodiment of the present invention.

[0037] In the figure: 1. screw; 2. end cover; 3. shell; 4. first PC board; 41. spring; 5. battery body; 51. lithium secondary battery; 511. pole ear; 52. lithium primary battery; 521. positive and negative terminals; 6. PCB board; 61. secondary battery connection; 62. primary battery connection; 7. BMS board; 71. stud; 8. second PC board; 10. connector. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] like Figure 1-Figure 3 As shown, the embodiment of the present invention discloses a lithium primary and secondary composite power source, comprising a housing 3, an end cover 2 and a battery module; wherein the battery module is arranged in a closed hollow cavity surrounded by the housing 3 and the end cover 2;

[0040] The battery module includes a battery body 5, a PCB board 6 and a BMS board 7;

[0041] The battery body 5 includes a plurality of lithium primary batteries 52 and lithium secondary batteries 51, wherein the lithium primary batteries 52 and the lithium secondary batteries 51 are alternately arranged;

[0042] All lithium primary batteries 52 are connected in series through the PCB board 6 to form a lithium primary battery branch circuit;

[0043] All lithium secondary batteries 51 are connected in series through the PCB board 6 to form a lithium secondary battery branch circuit;

[0044] The lithium primary battery branch and the lithium secondary battery branch are connected in parallel to form a lithium primary and secondary composite power source;

[0045] The BMS board 7 is connected to the PCB board 6 and is used to adjust and control the voltage of the lithium primary battery branch and the lithium secondary battery branch.

[0046] In a certain embodiment, the shell 3 and the end cover 2 are fixedly connected by screws 1, and the fixedly connected shell 3 and end cover 2 are jointly enclosed to form a closed hollow cavity.

[0047] In one embodiment, the number of the lithium primary batteries 52 and the number of the lithium secondary batteries 51 are the same;

[0048] The following takes the example that the number of lithium primary batteries 52 and lithium secondary batteries 51 is the same as that of the battery main body 5 to specifically describe the battery arrangement;

[0049] Assume that the battery body 5 includes five lithium primary batteries 52 and five lithium secondary batteries 51;

[0050] The batteries in the battery body 5 are arranged as follows: lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52.

[0051] The battery arrangement in the battery body 5 may be: lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51.

[0052] In one embodiment, the lithium primary battery 52 has one more than the lithium secondary battery 51;

[0053] The following takes the example that the lithium primary battery 52 has one more lithium secondary battery 51 as an example to specifically describe the arrangement of the batteries in the battery body 5;

[0054] Assume that the battery body 5 includes 6 lithium primary batteries 52 and 5 lithium secondary batteries 51, and the battery arrangement in the battery body 5 is: lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52.

[0055] In one embodiment, the lithium primary battery 52 is one less than the lithium secondary battery 51;

[0056] The following takes the example that the lithium primary battery 52 has one less lithium secondary battery 51 as an example to specifically describe the arrangement of the batteries in the battery body 5;

[0057] like Figure 2 As shown, assuming that the battery body 5 includes 5 lithium primary batteries 52 and 6 lithium secondary batteries 51, the battery arrangement in the battery body 5 is: lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium primary battery 52, lithium secondary battery 51, lithium secondary battery 51.

[0058] In a certain embodiment, the BMS board 7 is structurally connected to the PCB board through a stud 71, and the BMS board 7 is connected to the PCB board through a wiring harness. The BMS board 7 controls the voltage of the lithium primary battery branch to be the same as the voltage of the lithium secondary battery branch through the line.

[0059] In a certain embodiment, the lithium primary and secondary composite power source further comprises a first PC board 4 and a second PC board 8 disposed in the sealed hollow cavity;

[0060] One side of the first PC board 4 is fixedly connected to the end cover 2; the other side is fixed with a spring 41 at a location corresponding to each lithium primary battery 52;

[0061] The second PC board 8 is fixedly connected to the housing 3 .

[0062] In a certain embodiment, the first PC board 4 is fixedly connected to the end cover 2 by fixing glue;

[0063] In one embodiment, the second PC board 8 is fixedly connected to the housing 3 by a fixing glue (such as Figure 1 As shown, the second PC board 8 is fixedly adhered to the top surface of the housing 3);

[0064] It is understood that after the end cap 2 is tightened by the screw 1, the lithium primary battery 52 can be pressed under the pressure of the spring to ensure that the positive and negative terminals 521 of the lithium primary battery 52 are connected to their corresponding metal contacts. When the lithium primary battery 52 needs to be replaced, the screw 1 is unscrewed, the end cap 2 is removed, and the positive and negative terminals 521 of the lithium primary battery 52 are pulled out from their corresponding metal contacts.

[0065] It can be understood that the first PC board 4 and the second PC board 8 play a role in structural protection and insulation.

[0066] In a certain embodiment, the positive and negative terminals 521 of each lithium primary battery 52 are pluggably connected to the corresponding primary battery connection 62 on the PCB board;

[0067] The tab 511 of each lithium secondary battery 51 is fixedly connected to the corresponding secondary battery connection portion 61 on the PCB board.

[0068] The material of the pole ear is aluminum or nickel.

[0069] In a certain embodiment, the primary battery connection 62 is a metal contact in a groove shape; the positive and negative terminals 521 of each lithium primary battery 52 are pluggably connected to the corresponding metal contact;

[0070] The secondary battery connection part 61 is in an open shape and is attached with a metal bar; the tab 511 of each lithium secondary battery 51 is welded to its corresponding metal bar.

[0071] In one embodiment, the capacity of the lithium primary battery 52 and the capacity of the lithium secondary battery 51 are the same.

[0072] In one embodiment, the lithium primary battery 52 and the lithium secondary battery 51 are the same in length and width.

[0073] In one embodiment, the BMS board 7 is provided with a lithium primary battery 52 anti-recoil device.

[0074] In one embodiment, a connector 10 is disposed on the housing 3 , and the connector 10 is used for the discharge output of the lithium primary and secondary composite power source and for charging the lithium secondary battery 51 .

[0075] In one embodiment, the lithium primary battery 52 is a lithium carbon fluoride battery; and the lithium secondary battery 51 is a lithium iron phosphate or a ternary lithium battery.

[0076] In one embodiment, the lithium primary battery 52 is a square hard shell structure; and the lithium secondary battery 51 is a square soft package structure.

[0077] The shell of the lithium primary battery 52 is made of plastic.

[0078] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0079] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lithium primary and secondary composite power source, characterized in that: It comprises a shell (3), an end cover (2) and a battery module; wherein the battery module is arranged in a closed hollow cavity surrounded by the shell (3) and the end cover (2); The battery module comprises a battery body (5), a PCB board (6) and a BMS board (7); The battery body (5) comprises a plurality of lithium primary batteries (52) and lithium secondary batteries (51), wherein the lithium primary batteries (52) and the lithium secondary batteries (51) are alternately arranged in a laminated manner; All lithium primary batteries (52) are connected in series through the PCB board (6) to form a lithium primary battery branch circuit; All lithium secondary batteries (51) are connected in series via the PCB board (6) to form a lithium secondary battery branch circuit; The lithium primary battery branch and the lithium secondary battery branch are connected in parallel to form a lithium primary and secondary composite power source; The BMS board (7) is connected to the PCB board (6) and is used to adjust and control the voltage of the lithium primary battery branch and the lithium secondary battery branch.

2. A lithium primary and secondary composite power source according to claim 1, characterized in that: Also included are a first PC board (4) and a second PC board (8) disposed in the closed hollow cavity; One side of the first PC board (4) is fixedly connected to the end cover (2); a spring (41) is fixed at a location corresponding to each lithium primary battery (52) on the other side; The second PC board (8) is fixedly connected to the housing (3).

3. A lithium primary and secondary composite power source according to claim 1, characterized in that: The positive and negative terminals (521) of each lithium primary battery (52) are pluggably connected to the corresponding primary battery connection point (62) on the PCB board; The pole lug (511) of each lithium secondary battery (51) is fixedly connected to the corresponding secondary battery connection point (61) on the PCB board.

4. A lithium primary and secondary composite power source according to claim 3, characterized in that: The primary battery connection point (62) is a metal contact in the shape of a groove; the positive and negative terminals (521) of each lithium primary battery (52) are pluggably connected to the corresponding metal contact; The secondary battery connection part (61) is in an open shape and is attached with a metal bar; the pole ear (511) of each lithium secondary battery (51) is welded together with its corresponding metal bar.

5. A lithium primary and secondary composite power source according to claim 1, characterized in that: The lithium primary battery (52) and the lithium secondary battery (51) have the same capacity.

6. A lithium primary and secondary composite power source according to claim 1, characterized in that: The lithium primary battery (52) and the lithium secondary battery (51) are identical in length and width.

7. A lithium primary and secondary composite power source according to claim 1, characterized in that: The BMS board (7) is provided with a lithium primary battery (52) anti-recoil device.

8. A lithium primary and secondary composite power source according to claim 1, characterized in that: The housing (3) is provided with a connector (10), and the connector (10) is used for the discharge output of the lithium primary and secondary composite power source and for charging the lithium secondary battery (51).

9. A lithium primary and secondary composite power source according to claim 1, characterized in that: The lithium primary battery (52) is a lithium carbon fluoride battery; the lithium secondary battery (51) is a lithium iron phosphate or a ternary lithium battery.

10. A lithium primary and secondary composite power source according to claim 1, characterized in that: The lithium primary battery (52) is a square hard shell structure; the lithium secondary battery (51) is a square soft package structure.

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