Assembled lithium battery

Abstract

The invention relates to the technical field of lithium batteries, in particular to an assembled lithium battery which comprises a battery piece and a plurality of battery monomers, and further comprises a series battery module arranged in the right side of the battery piece through the battery monomers; and the parallel battery module is arranged in the left side of the battery piece through the battery monomers. The square box is used as a main body frame of the battery piece, the series battery module composed of the first single body and the second single body is arranged in the right side of the square box, the first single body is inverted, the second single body is erected, and the driven gear and the limiting ratchet wheel which are of an integrated structure are arranged in the first insulating table and the second insulating table; the second single body, the third single body and the fourth single body are supported by the negative electrode elastic supporting piece and the elastic lifting piece. And the temperature sensor is used for monitoring the temperature of the negative electrodes in the series battery module and the parallel battery module, so that the positive electrode on the second single body or the third single body is selectively connected to realize flexible power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to an assembled lithium battery. Background Art

[0002] A lithium battery uses lithium metal or a lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. Due to the highly reactive chemical properties of lithium metal, its processing, storage, and use place high demands on the environment. In recent years, with the advancement of microelectronics technology and the increasing number of miniaturized devices, lithium batteries have entered a stage of large-scale development and practical application.

[0003] To improve performance, existing lithium batteries often use an assembled structure. For example, CN113725535B discloses a soft-pack lithium battery cell module assembly structure and method. This document considers that the heat dissipation efficiency of soft-pack lithium batteries is inefficient, which can easily exacerbate wear and tear on the soft-pack batteries and cause bulging. Therefore, it proposes the coordinated use of battery cells, a control panel, power cables, an insulating plate, connecting components, a shock-absorbing component, and a heat dissipation component. By providing a through-plate, the lower hook plate can pass through the upper hook plate, enhancing the firmness of the connection between the two and preventing shaking and instability after the lower and upper hook plates are connected. However, this also increases the difficulty of installing battery cells in a limited space. In particular, when assembling a large number of battery cells, there is a lack of effective positional constraints, which can easily cause them to collide with each other. This not only limits the heat dissipation level within the lithium battery, but also increases the structural burden of the lithium battery itself. Even if the capacity is increased by increasing the number of battery cells, it can also be easily degraded due to abnormal losses. For example, a laminated lithium battery and its assembly method disclosed in announcement number CN111463496B simplifies the assembly process and improves the energy density of the battery compared to the conventional split connecting plate structure of the laminated lithium battery. However, a single connection method is used for the assembly between battery cells, which makes the battery power supply mode single. If a power supply failure occurs after long-term use, it can only be self-protected by power off. The lack of power management experience can easily affect the user experience of the lithium battery. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem of unreasonable use of lithium batteries with a single power supply mode in the prior art, and to propose an assembled lithium battery.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: An assembled lithium battery, comprising a battery unit and a number of battery cells, further comprising: A series battery module, wherein the series battery module is arranged in the right side of the battery unit through battery cells; A parallel battery module, wherein the parallel battery module is arranged in the left side of the battery unit through battery cells; A main negative terminal, the main negative terminal being fixedly connected to the two negative electrode ports of the series-connected battery module and the parallel-connected battery module; A main positive terminal, the main positive terminal corresponding to the two positive terminals of the series battery module and the parallel battery module; The positive switching mechanism is provided in the battery component, and the battery component is assembled and connected through the positive switching mechanism to the two positive terminals of the main positive terminal corresponding to the series battery module and the parallel battery module.

[0006] Preferably, the battery component includes a main cavity and a lower cavity opened from top to bottom, the main cavity is used to house two positive ports of the built-in series battery module and the parallel battery module, and the two positive ports are main positive terminals, and the lower cavity is used to house two negative ports of the built-in main positive terminal, and the two negative ports correspond to the series battery module and the parallel battery module respectively.

[0007] Preferably, the battery cells include a first cell and a second cell forming a series battery module, and the battery cells further include a third cell and a fourth cell forming a parallel battery module.

[0008] Preferably, the first monomer positive electrode and the second monomer negative electrode are arranged in the same downward direction, and the first monomer and the second monomer are connected in series, and the third monomer positive electrode and the fourth monomer positive electrode are arranged in the same upward direction, and the third monomer and the fourth monomer are connected in parallel.

[0009] Preferably, the series battery module uses the first single negative electrode as the negative electrode port connected to the main negative terminal, and the series battery module uses the second single positive electrode as the positive electrode port corresponding to the main positive terminal.

[0010] Preferably, the parallel battery module uses the fourth single-cell negative electrode as the negative electrode port connected to the main negative terminal, and the parallel battery module uses the third single-cell positive electrode as the positive electrode port corresponding to the main positive terminal.

[0011] Preferably, the battery assembly is provided with an anti-reverse limiting mechanism for fixing the unidirectionally installed battery cells.

[0012] Preferably, the positive electrode switching mechanism is located between the series battery module and the parallel battery module, and the positive electrode switching mechanism corresponds to the positive electrodes of the second cell and the third cell.

[0013] Preferably, the positive electrode switching mechanism includes: A temperature sensor for monitoring the temperature of the negative electrode ports of the series-connected battery modules and the parallel-connected battery modules; a central controller, the central controller being electrically connected to the upper temperature sensor; There are two lifting brackets, and the two lifting brackets are slidably installed in the main cavity; A reciprocating conductive hanging rod, wherein the reciprocating conductive hanging rod pin is installed on the main cavity, and the reciprocating conductive hanging rod corresponds to the two positive electrode ports of the series battery module and the parallel battery module.

[0014] Preferably, the negative electrodes of the first cell and the fourth cell are both equipped with a balancing circuit BMS.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The present invention utilizes a square box as the main frame of the battery unit, and arranges a series battery module consisting of a first cell and a second cell on the right side of the square box. The first cell is inverted, the second cell is upright, and a first lower support and a first upper support are arranged between the first cell and the second cell to achieve series connection between the two, thereby providing a series power supply circuit for the battery unit.

[0016] 2. The present invention sets a parallel battery module consisting of a third cell and a fourth cell on the left side of the square box, wherein the third cell and the fourth cell are placed upright, and a second lower support and a second upper support are set between the third cell and the fourth cell to achieve parallel connection between the two cells, thereby providing a parallel power supply circuit for the battery components.

[0017] 3. The present invention sets an integrated driven gear and a limiting ratchet in the first insulating platform and the second insulating platform, uses the negative elastic support member and the elastic lifting member to set a guide rack, and sets a limiting plug with a downward extension tendency in the first insulating platform and the second insulating platform, which cooperates with the second cell, the third cell, and the fourth cell supported by the negative elastic support member and the elastic lifting member to limit and fix them, so as to reasonably divide and limit a large number of battery cells in the battery unit.

[0018] 4. The present invention sets a positive electrode switching mechanism between the series battery module and the parallel battery module in the main cavity, and uses a temperature sensor to monitor the temperature of the negative electrodes in the series battery module and the parallel battery module, so as to selectively connect the positive electrode on the second cell or the third cell to achieve flexible power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of an assembled lithium battery proposed by the present invention; Figure 2 This is a rear view of an assembled lithium battery proposed by the present invention; Figure 3 A schematic diagram of the battery cell structure of an assembled lithium battery proposed in the present invention; Figure 4 A cross-sectional view of a battery cell of an assembled lithium battery proposed by the present invention; Figure 5 This is a front cross-sectional view of an assembled lithium battery proposed by the present invention; Figure 6 This is a rear cross-sectional view of an assembled lithium battery proposed by the present invention; Figure 7 A first side sectional view of an assembled lithium battery proposed by the present invention; Figure 8 A second side sectional view of an assembled lithium battery provided by the present invention; Figure 9 This is an enlarged schematic diagram of the structure of part A of an assembled lithium battery proposed by the present invention; Figure 10 This is an enlarged schematic diagram of the structure of part B of an assembled lithium battery proposed by the present invention; Figure 11 This is a schematic diagram of the structure of a series-connected battery module of an assembled lithium battery proposed by the present invention; Figure 12 A cross-sectional view of a series-connected battery module of an assembled lithium battery proposed by the present invention; Figure 13 This is a schematic diagram of the parallel battery module structure of an assembled lithium battery proposed in the present invention; Figure 14 A cross-sectional view of a parallel battery module of an assembled lithium battery proposed by the present invention; Figure 15 This is a schematic structural diagram of the positive electrode switching mechanism of an assembled lithium battery proposed by the present invention.

[0020] In the picture: 1. Battery components; 11. Main cavity; 12. Lower cavity; 13. Operation window; 2. Battery cell; 21. First cell; 22. Second cell; 23. Third cell; 24. Fourth cell; 3. Series battery modules; 31. First lower support; 311. First insulating platform; 312. Positive electrode support plate; 313. Negative electrode elastic support member; 314. First sleeve; 315. Negative electrode pressing plate; 316. First conductive head; 317. Series connector; 318. Steering sprocket; 319. Synchronous chain; 32. First upper support; 321. First positive limit plate; 322. Positive conductive plate; 4. Parallel battery modules; 41. Second lower support; 411. Second insulating platform; 412. Second sleeve; 413. Elastic lifting member; 414. Fixed conductive connector; 415. Second conductive head; 42. Second upper support; 421. Second positive limit plate; 422. Parallel connector; 5. Anti-reverse limit mechanism; 51. Guide rack; 52. Driven gear; 53. Limit ratchet; 54. Limit plug; 6. Main negative terminal; 7. Main positive terminal; 8. Positive pole switching mechanism; 81. Temperature sensor; 82. Central controller; 83. First automatic telescopic member; 84. Lifting bracket; 85. Piston tube; 86. Second automatic telescopic member; 87. Active piston member; 88. Driven piston oblique lifting drive member; 89. Elastic wedge telescopic member; 810. Drive rack; 811. Central rotating shaft; 812. Reciprocating gear; 813. Traction turntable; 814. Reciprocating conductive hanging rod. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Reference Figures 1-15 , an assembled lithium battery, including a battery unit 1 and a number of battery cells 2, and also including a series battery module 3, a parallel battery module 4, a main negative terminal 6, a main positive terminal 7, and a positive pole switching mechanism 8. It should be noted that the main negative terminal 6 is formed by connecting the negative poles of the series battery module 3 and the parallel battery module 4, separating the positive poles of the series battery module 3 and the parallel battery module 4, and providing a main positive terminal 7 that can be assembled and connected with the two positive poles in the battery unit 1. By real-time monitoring of the temperature of the negative poles in the series battery module 3 and the parallel battery module 4, the positive pole switching mechanism 8 can be used to select the appropriate series battery module 3 or parallel battery module 4 to power the battery unit 1.

[0023] The battery unit 1 utilizes a main negative terminal 6 and a main positive terminal 7 as output interfaces. In addition, the battery unit 1 is also provided with an interface for charging the series-connected battery modules 3 or the parallel-connected battery modules 4 .

[0024] The battery unit 1 comprises a main cavity 11 and a lower cavity 12, which extend from top to bottom. The main cavity 11 is used to house the two positive terminals of the series-connected battery module 3 and the parallel-connected battery module 4, and both positive terminals are main positive terminals 7. The lower cavity 12 is used to house the two negative terminals of the main positive terminal 7, and the two negative terminals correspond to the series-connected battery module 3 and the parallel-connected battery module 4, respectively. The battery unit 1 is a square box structure as a whole, preferably a lithium iron phosphate square shell, and heat dissipation is aided by heat dissipation holes and inserted heat sinks. One side is provided with an openable and closable operating window 13. By providing an adjustable explosion-proof glass panel, it is convenient to assemble the battery cells 2 in the box to form the series-connected battery module 3 and the parallel-connected battery module 4, and it also facilitates observation and routine maintenance of the battery unit 1.

[0025] It is worth noting that the number of series battery modules 3 and parallel battery modules 4 is set according to the specifications of the battery unit 1. The two are equal in number and symmetrically arranged in the battery unit 1. When the number of series battery modules 3 and parallel battery modules 4 exceeds three groups, they need to be placed in layers and separated by insulating plates. When connecting the nickel strips, pay attention to uniform routing to avoid local overheating.

[0026] The battery cell 2 includes a first cell 21 and a second cell 22 that form a series battery module 3. The battery cell 2 also includes a third cell 23 and a fourth cell 24 that form a parallel battery module 4. Figure 11 , Attachment Figure 12 By reversely installing the first cell 21 and the second cell 22, the positive electrode of the first cell 21 is connected in series with the negative electrode of the second cell 22. When the number of series battery modules 3 is stacked, the negative electrode of the second cell 22 in the previous group is conductively connected to the negative electrode of the first cell 21 in the next group to form a higher level of series connection; for details, please refer to the attached manual. Figure 13 With attached Figure 14 By arranging and installing the third monomer 23 and the fourth monomer 24, when the number of parallel battery modules 4 is stacked, the positive electrode and the negative electrode of the third monomer 23 and the fourth monomer 24 are conductively connected.

[0027] The positive electrode of the third monomer 23 and the positive electrode of the fourth monomer 24 are arranged in the same direction upward, that is, the first monomer 21 is installed in an inverted manner, the second monomer 22 is installed upright, and the first monomer 21 and the second monomer 22 are connected in series, and the positive electrode of the third monomer 23 and the positive electrode of the fourth monomer 24 are arranged in the same direction upward, that is, the third monomer 23 and the fourth monomer 24 are both installed upright, and the third monomer 23 and the fourth monomer 24 are connected in parallel. By setting a battery monomer 2 connection structure that is both series and parallel, the battery component 1 can be powered differentially by the series battery module 3 and the parallel battery module 4, which not only meets the voltage and capacity requirements at the same time, but also flexibly adjusts the total voltage and total capacity of the lithium battery to adapt to the power requirements of different equipment.

[0028] First, compared to directly using high-voltage or large-capacity battery cells, the series-parallel combination can use standard-specification batteries, reducing procurement costs. The modular design also facilitates maintenance and replacement. Secondly, the parallel battery modules 4 can disperse the current, which helps to reduce the heating pressure of the battery cells 2; the series battery modules 3 cooperate with the thermal management system to control the temperature more evenly and reduce the risk of thermal runaway.

[0029] The series battery module 3 is arranged in the right side of the battery unit 1 through the battery cell 2. The series battery module 3 includes a first lower support 31 and a first upper support 32: The first lower support 31 is used to fix the positive electrode of the first monomer 21 and the negative electrode of the second monomer 22. The positive electrode of the first monomer 21 and the negative electrode of the second monomer 22 are conductively connected through the first lower support 31. The negative electrode of the first monomer 21 is conductively connected to the main negative terminal 6 through the first lower support 31. The first lower support 31 includes a first insulating platform 311, a positive electrode support plate 312, a negative electrode pressing plate 315, a negative electrode elastic support member 313, a series connector 317, and a steering sprocket 318: The first insulating platform 311 is fixedly disposed on the right side of the main cavity 11 so that the second cell 22 is located on the left side of the first cell 21 , thereby forming a symmetrically distributed positive electrode with the third cell 23 in the parallel battery module 4 .

[0030] The positive electrode support plate 312 is fixedly disposed on the first insulating platform 311 . A notch structure corresponding to the positive electrode of the first monomer 21 is opened at one end of the positive electrode support plate 312 to play a preliminary guiding role in the process of horizontally pushing the first monomer 21 on the positive electrode support plate 312 .

[0031] The negative electrode clamping plate 315 is slidably arranged on the side wall of the main cavity 11, and the negative electrode clamping plate 315 and the positive electrode support plate 312 are used to invert the installation of the first monomer 21. A first sleeve 314 for the main negative terminal 6 is fixedly installed in the lower cavity 12, and a first conductive head 316 corresponding to the main negative terminal 6 is fixedly connected to the negative electrode clamping plate 315. A vertical sliding groove is opened in the side wall of the main cavity 11, and it moves vertically downward under the traction of the negative electrode elastic support member 313 to vertically press the first monomer 21 located on the positive electrode support plate 312, and at the same time, the negative electrode clamping plate 315 is conductively connected to the main negative terminal 6.

[0032] The negative electrode elastic support member 313 is movably disposed on the first insulating platform 311 . Under the elastic support function, the second unit 22 located on the negative electrode elastic support member 313 always has a vertical upward tendency.

[0033] One end of the series connector 317 is fixedly connected to the primary positive electrode support plate 312 , and one end of the series connector 317 is slidably connected to the negative electrode elastic support member 313 , thereby achieving a conductive connection between the positive electrode of the first cell 21 and the negative electrode of the second cell 22 .

[0034] The steering sprocket 318 is arranged in the main cavity 11, and a synchronous chain 319 is fixedly connected between the negative electrode clamping plate 315 and the negative electrode elastic support member 313 through the steering sprocket 318. It should be noted that when the negative electrode elastic support member 313 moves upward, the negative electrode clamping plate 315 can be pulled vertically downward to facilitate the relative positioning and fixing of the first monomer 21 and the second monomer 22 on the first insulating platform 311.

[0035] The first upper support 32 is used to fix the negative electrode of the first monomer 21 and the positive electrode of the second monomer 22, and the second monomer 22 forms a positive electrode port corresponding to the main positive terminal 7 and the positive switching mechanism 8 through the first upper support 32. The first upper support 32 includes a first positive limit plate 321 and a positive conductive plate 322: The first positive limit plate 321 is fixedly installed on the inner wall of the main cavity 11, and the negative elastic support part 313 and the first positive limit plate 321 are used to uprightly install the second monomer 22. A countersunk hole corresponding to the positive pole of the second monomer 22 is opened at the middle end of the first positive limit plate 321. When the second monomer 22 is lifted upward by the negative elastic support part 313, the positive pole of the second monomer 22 can be snapped into the countersunk hole.

[0036] The positive conductive plate 322 is fixedly disposed on the first positive limit plate 321 . By connecting the positive conductive plate 322 to the positive switching mechanism 8 , a path for connecting the battery modules 3 in series can be achieved.

[0037] The parallel battery module 4 is arranged in the left side of the battery unit 1 through the battery cell 2. The parallel battery module 4 includes a second lower support 41 and a second upper support 42: The second lower support 41 is used to fix the negative electrodes of the third cell 23 and the fourth cell 24, and the negative electrodes of the third cell 23 and the fourth cell 24 are conductively connected in parallel to the main negative terminal 6. The second lower support 41 includes a second insulating platform 411, a second sleeve 412, an elastic lifting member 413, a fixed conductive connector 414, and a second conductive head 415: The second insulating platform 411 is fixedly arranged on the left side of the main cavity 11 . By arranging the third and fourth monomers 23 and 24 with the positive poles facing upward on the second insulating platform 411 , a positive pole corresponding to the positive pole of the second monomer 22 is conveniently formed.

[0038] The second sleeve 412 is fixedly disposed in the lower cavity 12 and is used to provide sheath protection for the elastic lifting member 413 , the main negative terminal 6 , the fixed conductive connector 414 , and the second conductive terminal 415 .

[0039] The elastic lifting member 413 is movably mounted on the second sleeve 412 , and under the elastic support, the second conductive head 415 contacts the fixed conductive connector 414 , thereby realizing the parallel connection of the third cell 23 , the fourth cell 24 and the main negative terminal 6 .

[0040] The fixed conductive connector 414 is fixedly installed in the upper end of the second sleeve 412 , and the fixed conductive connector 414 is conductively connected to the main negative terminal 6 .

[0041] The second conductive head 415 is fixedly connected to the lower end of the elastic lifting member 413 located in the second sleeve 412 .

[0042] The second upper support 42 is used to fix the positive electrodes of the third cell 23 and the fourth cell 24, and the positive electrodes of the third cell 23 and the fourth cell 24 are connected in parallel to form a positive electrode port corresponding to the main positive terminal 7 and the positive switching mechanism 8. The second upper support 42 includes a second positive limit plate 421 and a parallel connector 422: The second positive limit plate 421 is fixedly arranged on the inner wall of the main cavity 11. The elastic lifting member 413 and the second positive limit plate 421 on the same side are used to install the third cell 23 or the fourth cell 24 upright. The positive poles in the third cell 23 and the fourth cell 24 can both be used as the positive pole ports of the parallel battery module 4 corresponding to the positive pole switching mechanism 8 and the main positive terminal 7.

[0043] The parallel connector 422 is fixedly disposed in the main cavity 11 , and is used to connect the positive electrodes of the third cell 23 and the fourth cell 24 in the parallel battery module 4 in parallel.

[0044] The series battery module 3 uses the negative electrode of the first cell 21 as the negative terminal connected to the main negative terminal 6 , and uses the positive electrode of the second cell 22 as the positive terminal corresponding to the main positive terminal 7 .

[0045] The parallel battery module 4 uses the negative electrode of the fourth cell 24 as the negative terminal connected to the main negative terminal 6 , and uses the positive electrode of the third cell 23 as the positive terminal corresponding to the main positive terminal 7 .

[0046] Please refer to the instruction manual for details Figure 6 -Attached Figure 8 The main negative terminal 6 is fixedly connected to the two negative terminals of the series battery module 3 and the parallel battery module 4.

[0047] Please refer to the instruction manual for details Figure 1 , Attachment Figure 5 , Attachment Figure 6 The main positive terminal 7 corresponds to the two positive terminals of the series-connected battery module 3 and the parallel-connected battery module 4.

[0048] The positive switching mechanism 8 is provided in the battery unit 1 , and the battery unit 1 is assembled and connected to the two positive terminals of the main positive terminal 7 corresponding to the series battery module 3 and the parallel battery module 4 through the positive switching mechanism 8 .

[0049] Please refer to the instruction manual for details Figure 7 -Attached Figure 10 The battery assembly 1 is provided with an anti-reverse limiting mechanism 5 for fixing the unidirectionally installed battery cells 2. The number of anti-reverse limiting mechanisms 5 is set according to the number of the second cells 22, third cells 23, and fourth cells 24 installed upright. The anti-reverse limiting mechanism 5 acting on the second cell 22 is described below, and includes a guide rack 51, a driven gear 52, and a limiting plug 54: The guide rack 51 is fixedly connected to the lower end of the negative electrode elastic support 313 , and the guide rack 51 movably passes through the first insulating platform 311 .

[0050] The driven gear 52 is rotatably mounted on the first insulating platform 311 via a central shaft, and a limit ratchet 53 is keyed on the central shaft.

[0051] The limit pin 54 is slidably mounted in the first insulating platform 311, and the limit pin 54 and the limit ratchet 53 are movably opposed to each other. During the horizontal movement of the upright second unit 22, the third unit 23 and the fourth unit 24, the guide rack 51 moves vertically downward due to its own gravity, thereby driving the driven gear 52 to rotate. During this process, the limit pin 54 can be used to limit the limit ratchet 53 in one direction, which can effectively prevent it from rebounding upward. When disassembly and assembly are required, the limit pin 54 can be lifted upward to release the limit on the limit ratchet 53.

[0052] The positive switching mechanism 8 is located between the series battery module 3 and the parallel battery module 4. The positive switching mechanism 8 corresponds to the positive electrodes of the second cell 22 and the third cell 23. The positive switching mechanism 8 includes a temperature sensor 81, a central controller 82, a first automatic telescopic member 83, a lifting bracket 84, a second automatic telescopic member 86, a piston tube 85, an active piston member 87, a driven piston oblique lifting drive member 88, an elastic wedge telescopic member 89, a drive rack 810, a central shaft 811, a reciprocating gear 812, a traction turntable 813, and a reciprocating conductive hanging rod 814. The temperature sensor 81 is fixedly installed in the main cavity 11 , and the temperature sensor 81 is used to monitor the temperature conditions of the negative electrode ports of the series-connected battery module 3 and the parallel-connected battery module 4 .

[0053] The central controller 82 is fixedly installed in the main cavity 11 , and the central controller 82 is electrically connected to the upper temperature sensor 81 .

[0054] There are two first automatic telescopic members 83 , which are fixedly mounted on the central controller 82 , and the first automatic telescopic members 83 are electrically connected to the central controller 82 .

[0055] There are two lifting brackets 84, and the two lifting brackets 84 are pulled by the output end of the first automatic telescopic member 83 and slidably installed in the main cavity 11. It should be noted that under normal circumstances, the two groups of lifting brackets 84 are in a high or low position, that is, the driving rack 810 is higher or lower than the reciprocating gear 812. When the temperature sensor 81 senses that the negative electrode temperature it monitors is abnormal, it controls the lifting bracket 84 to move downward so that the driving rack 810 is horizontally corresponding to the reciprocating gear 812, that is, the driving rack 810 is engaged with the reciprocating gear 812.

[0056] The second automatic telescopic member 86 is fixedly mounted on the lifting bracket 84 .

[0057] The piston tube 85 is fixedly mounted on the lifting bracket 84 .

[0058] The active piston member 87 is pulled by the second automatic telescopic member 86 and slidably sleeved into the lower end of the piston tube 85.

[0059] The driven piston oblique lifting driving member 88 cooperates with the active piston member 87 to slide into the upper end of the piston tube 85.

[0060] The elastic wedge telescopic member 89 is movably installed on the lifting bracket 84, and the elastic wedge telescopic member 89 is slidably mounted in the driven piston oblique lifting drive member 88. The central controller 82 pulls the driven piston oblique lifting drive member 88 vertically downward through the active piston member 87 to apply pressure to the elastic wedge telescopic member 89, so that the driving rack 810 moves horizontally, thereby driving the central shaft 811 to rotate.

[0061] The driving rack 810 is integrally connected to the elastic wedge telescopic member 89.

[0062] The central shaft 811 is rotatably mounted in the main cavity 11 .

[0063] The reciprocating gear 812 is key-connected to the central rotating shaft 811 , and the reciprocating gear 812 is movably engaged with the driving rack 810 .

[0064] The traction turntable 813 is fixedly connected to the central rotating shaft 811, and an eccentrically arranged traction bolt is integrally connected to the traction turntable 813. The traction turntable 813 drives the reciprocating conductive hanging rod 814 to swing through the traction bolt, so that the reciprocating conductive hanging rod 814 contacts the positive electrode ports of the second monomer 22 and the third monomer 23 on both sides.

[0065] The pin shaft of the reciprocating conductive hanging rod 814 is installed on the main cavity 11, and the reciprocating conductive hanging rod 814 corresponds to the two positive ports of the series battery module 3 and the parallel battery module 4. The reciprocating conductive hanging rod 814 is located between the two positive ports of the third single cell 23 and the fourth single cell 24, and the reciprocating conductive hanging rod 814 is movably pulled by the traction turntable 813. A traction long hole for a sliding traction bolt is provided in the reciprocating conductive hanging rod 814. The traction turntable 813 rotates with the central shaft 811 to drive the reciprocating conductive hanging rod 814 to deflect, so that the reciprocating conductive hanging rod 814 can be separated from or connected to the positive port on the second single cell 22 or the third single cell 23, thereby switching and adjusting the power supply mode of the battery component 1.

[0066] The above method can simultaneously meet the needs of high voltage and large capacity, flexibly adapt to the power requirements of different devices, balance the voltage, current and capacity of the battery cell 2, and improve the overall reliability and practicality of the battery unit 1.

[0067] The negative poles of the first cell 21 and the fourth cell 24 are both equipped with a balancing circuit BMS. The overcharge protection voltage of the balancing circuit BMS needs to match the battery cell 2 to avoid using battery cells 2 of different models or with large differences in capacity. The balancing circuit BMS is used to monitor the voltage, temperature and state of the first cell 21, the second cell 22, the third cell 23 and the fourth cell 24 in the battery cell 2, balance the charge and discharge current of the battery cell 2, so that it can achieve equal charging and discharging, prevent overcharging, overdischarging or overheating, and ensure safety and life. Through active or passive balancing technology, the voltage of each cell is balanced to avoid the "short board effect", that is, when the temperature of a battery cell 2 exceeds 60°C, the balancing circuit BMS triggers power-off protection. At this time, the positive pole switching mechanism 8 can be used to select the backup power supply mode for the battery unit 1.

[0068] In addition, by dividing the battery cells 2 into several small modules in the battery unit 1, it is easy to maintain and replace faulty modules, and at the same time, the working mode of the series-parallel circuit is dynamically adjusted to improve the efficiency of the battery unit 1.

[0069] It should be noted that the specific models and specifications of the battery cell 2, temperature sensor 81, central controller 82, first automatic telescopic component 83, and second automatic telescopic component 86 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it is not repeated here.

[0070] The present invention can be explained through the following operation mode: The voltage and temperature conditions of the negative electrodes of the series-connected battery module 3 and the parallel-connected battery module 4 are monitored by the balancing circuit BMS. In particular, the temperature sensor 81 is used to monitor the temperature of the negative electrodes of the series-connected battery module 3 and the parallel-connected battery module 4. When the temperature of the negative electrode in the series-connected battery module 3 exceeds a threshold, the central controller 82 controls the first automatic telescopic member 83 to open, causing the lifting bracket 84 to move vertically downward in the main cavity 11, so that the driving rack 810 on the lifting bracket 84 is meshed with the reciprocating gear 812; The central controller 82 controls the second automatic telescopic member 86 to drive the active piston member 87 to move downward, so that the driven piston oblique lifting drive member 88 applies pressure to the elastic wedge telescopic member 89 during the downward movement. The horizontally moving elastic wedge telescopic member 89 drives the reciprocating gear 812 to rotate by driving the rack 810, and the central shaft 811 drives the traction turntable 813 to rotate. The traction turntable 813 drives the reciprocating conductive hanging rod 814 to deflect through the traction bolt, so that the reciprocating conductive hanging rod 814 is disconnected from the positive port of the second single cell 22 and contacts the positive port of the third single cell 23, so as to use the parallel battery module 4 to achieve flexible power supply.

[0071] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An assembled lithium battery, comprising a battery unit (1) and a number of battery cells (2), characterized in that: Also includes: A series battery module (3), wherein the series battery module (3) is arranged in the right side of the battery unit (1) via a battery cell (2); A parallel battery module (4), the parallel battery module (4) being arranged inside the left side of the battery unit (1) via a battery cell (2); A main negative terminal (6), wherein the main negative terminal (6) is fixedly connected to two negative electrode ports of the series battery module (3) and the parallel battery module (4); A main positive terminal (7), the main positive terminal (7) corresponding to two positive terminals of the series battery module (3) and the parallel battery module (4); A positive pole switching mechanism (8) is provided in the battery component (1), and the battery component (1) is assembled and connected to the main positive terminal (7) corresponding to the two positive pole ports of the series battery module (3) and the parallel battery module (4) through the positive pole switching mechanism (8).

2. The assembled lithium battery according to claim 1, characterized in that: The battery component (1) comprises a main cavity (11) and a lower cavity (12) opened from top to bottom, wherein the main cavity (11) is used for housing two positive electrode ports of a series battery module (3) and a parallel battery module (4), and both positive electrode ports are main positive electrode terminals (7), and the lower cavity (12) is used for housing two negative electrode ports of the main positive electrode terminal (7), and the two negative electrode ports correspond to the series battery module (3) and the parallel battery module (4), respectively.

3. The assembled lithium battery according to claim 2, characterized in that: The battery cell (2) comprises a first cell (21) and a second cell (22) constituting a series battery module (3), and the battery cell (2) further comprises a third cell (23) and a fourth cell (24) constituting a parallel battery module (4).

4. The assembled lithium battery according to claim 3, characterized in that: The positive electrode of the first monomer (21) and the negative electrode of the second monomer (22) are arranged in the same downward direction, and the first monomer (21) and the second monomer (22) are connected in series; the positive electrode of the third monomer (23) and the positive electrode of the fourth monomer (24) are arranged in the same upward direction, and the third monomer (23) and the fourth monomer (24) are connected in parallel.

5. The assembled lithium battery according to claim 4, characterized in that: The series battery module (3) uses the negative electrode of the first cell (21) as a negative electrode port connected to the main negative terminal (6), and the series battery module (3) uses the positive electrode of the second cell (22) as a positive electrode port corresponding to the main positive terminal (7).

6. The assembled lithium battery according to claim 5, characterized in that: The parallel battery module (4) uses the negative electrode of the fourth cell (24) as a negative electrode port connected to the main negative terminal (6), and the parallel battery module (4) uses the positive electrode of the third cell (23) as a positive electrode port corresponding to the main positive terminal (7).

7. The assembled lithium battery according to claim 6, characterized in that: The battery component (1) is provided with an anti-reverse limiting mechanism (5) for fixing the unidirectionally installed battery cell (2).

8. The assembled lithium battery according to claim 7, characterized in that: The positive pole switching mechanism (8) is located between the series battery module (3) and the parallel battery module (4), and the positive pole switching mechanism (8) corresponds to the positive poles of the second monomer (22) and the third monomer (23).

9. The assembled lithium battery according to claim 8, characterized in that: The positive electrode switching mechanism (8) comprises: A temperature sensor (81), the temperature sensor (81) is used to monitor the temperature conditions of the negative electrode ports of the series battery module (3) and the parallel battery module (4); a central controller (82), the central controller (82) being electrically connected to the upper temperature sensor (81); A lifting bracket (84), wherein the number of the lifting brackets (84) is two, and the two lifting brackets (84) are slidably mounted in the main cavity (11); A reciprocating conductive hanging rod (814) is pin-mounted on the main cavity (11), and the reciprocating conductive hanging rod (814) corresponds to the two positive electrode ports of the series battery module (3) and the parallel battery module (4).

10. The assembled lithium battery according to claim 9, characterized in that: The negative electrodes of the first cell (21) and the fourth cell (24) are both equipped with a balancing circuit BMS.

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