Support for assembling soft package lithium battery pack, pole piece connecting plate and soft package battery pack

Abstract

The invention relates to a support for assembling a soft package lithium battery pack, a pole piece connecting plate used for preparing the soft package lithium battery pack and the soft package lithium battery pack. The assembling support ensures that the clamping force of the soft package lithium battery pack clamped between the pressing plate and the movable plate is a fixed value through rotation of the adjusting screw rod, the production requirement for the fixed value of the external clamping force of the soft package lithium battery pack in batches is met, and damage to the soft package lithium battery pack caused by too large clamping force is effectively avoided. The connection reliability of each single battery cell can be effectively improved through the pole piece connecting plate, and the use of the pole piece connecting plate is convenient for standardized implementation of the assembly process, so that the reliability of electrical connection in the use process is improved; moreover, the structure of the pole piece connecting plate is suitable for the use of a power strip standard component, so that the production efficiency is improved, and the battery pack wiring attractiveness is improved. The support for assembling the soft package lithium battery pack is suitable for a PACK assembling process of a certain batch of soft package lithium battery packs, and a proper tool clamp is matched for assembling production.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium battery PACK, and specifically relates to a bracket used for assembling a soft-pack lithium battery pack, and a pole piece connecting plate used for preparing the soft-pack battery pack. Background Art

[0002] The soft-pack lithium battery pack is composed of a certain number of single soft-pack lithium cells that are electrically connected to form a battery module. After the battery module is connected to the BMS board and equipped with a shell, products with different uses are obtained. In the process of assembling the battery module, each single soft-pack lithium cell needs to be reliably fixed and then connected with electrical connection devices; this process involves the problem of fixing by a certain device and the structural technical setting of how to reliably connect each device, which is the technical problem solved by the present invention. Summary of the invention

[0003] According to the problems mentioned in the background technology, the present invention provides a bracket for assembling a soft-pack lithium battery pack, which can reliably fix each single soft-pack lithium battery cell to be connected, and obtain a battery module through the connection structure of the pole piece and the plate. The technical solution is as follows: First, the bracket 1 for assembling a soft-pack lithium battery pack involved in the present invention comprises a pressing plate 11; through holes for installing a positioning rod 14 are provided at the upper and lower ends of the pressing plate 11, and a base 17 is provided in the middle of the right side thereof, and the base 17 is installed and connected in cooperation with other external components; a limiting ring is provided at the right end of the positioning rod 14, including a first positioning rod 141 and a second positioning rod 142; a spring 15 is installed between the limiting ring and the pressing plate 11, and the spring 15 includes a first spring 151 and a second spring 152; after the first positioning rod 141 passes through the lower through hole where the movable plate 13 is located, its left end is connected and fixed to the lower part of the base plate 12; after the second positioning rod 142 passes through the upper through hole where the movable plate 13 is located, its left end is connected and fixed to the upper part of the base plate 12; a screw hole for installing a pressure adjusting screw 16 is provided in the middle of the base plate 12; the right end of the pressure adjusting screw 16 is fixedly pressed at the middle position of the left side of the movable plate 13.

[0004] Furthermore, the method for controlling the clamping pressure of a soft-pack lithium battery pack by using the bracket 1 for assembling a soft-pack lithium battery pack comprises the following steps: Step 1: Place the pressure test device between the pressure plate 11 and the movable plate 13, rotate the adjusting screw 16 to move the movable plate 13 toward the pressure plate 11, and stop rotating the adjusting screw 16 when the spring 15 is in the initial compression state, that is, when the pressure value of the pressure test device changes, and record the initial position of the adjusting screw 16; Step 2: Continue to rotate the adjusting screw 16, read the pressure value of the pressure test device at the same time, and record the screw-in position of the adjusting screw 16 corresponding to different pressure values, and obtain a pressure position comparison table of the pressure value and the screw-in position of the adjusting screw 16; Step 3: Remove the pressure test device and replace it with a soft-pack lithium battery pack; Step 4: According to the external force value recommended for the soft-pack lithium battery pack, refer to the pressure position comparison table and rotate the adjusting screw 16 to the corresponding screw-in position to fix the soft-pack lithium battery pack; the external force value recommended for the soft-pack lithium battery pack is equal to the force applied to the spring 15.

[0005] The pressure testing device adopts a column pressure gauge tester, preferably an external in-line tension and pressure tester.

[0006] Secondly, the bracket 1 used for the assembly of the soft-pack lithium battery pack used in the present invention relates to a pole piece connecting plate 2 for connecting each single soft-pack lithium battery cell, including a PCB board 21; the PCB board 21 is provided with a cell pole piece hole 22 matching the positive and negative poles of the stacked four single soft-pack lithium battery cells 3, which is used for the insertion of the positive and negative poles of each single soft-pack lithium battery cell 3, and a negative electrode printed circuit 25 and a positive electrode printed circuit 26 are printed on the surface of the PCB board 21; the upper and lower parts of the cell pole piece hole 22 are provided with a negative electrode slot 23 and a positive electrode slot 24, and a signal line slot is provided in the middle. The negative electrode slot 23 is a four-pin slot, provided with a first negative electrode pin 231, a second negative electrode pin 232, a third negative electrode pin 233 and a fourth negative electrode pin 234; the positive electrode slot 24 is a four-pin slot, provided with a first positive electrode pin 241, a second positive electrode pin 242, a third positive electrode pin 243 and a fourth positive electrode pin 244; the signal line slot 27 is an eight-pin slot, provided with a first signal pin 271, a second signal pin 272, a third signal pin 273, a fourth signal pin 274, a fifth signal pin 275, a sixth signal pin 276, a seventh signal pin 277 and the eighth signal pin 278; the negative electrodes of the first battery cell 31, the second battery cell 32, the third battery cell 33 and the fourth battery cell 34 are electrically connected to the negative printed circuit 25, and then electrically connected to the first negative electrode needle 231, the second negative electrode needle 232, the third negative electrode needle 233 and the fourth negative electrode needle 234; the positive electrodes of the first battery cell 31, the second battery cell 32, the third battery cell 33 and the fourth battery cell 34 are electrically connected to the positive printed circuit 26, and then electrically connected to the first positive electrode needle 241, the second positive electrode needle 242, the third positive electrode needle 243 and the fourth positive electrode needle 244 Corresponding electrical connections; the fifth signal pin 275, the sixth signal pin 276, the seventh signal pin 277 and the eighth signal pin 278 of the signal line slot 27 are electrically connected to the first positive pin 241, the second positive pin 242, the third positive pin 243 and the fourth positive pin 244 through the positive printed circuit 26, and the first signal pin 271 is electrically connected to the first negative pin 231 through the negative printed circuit 25, and the second signal pin 272, the third signal pin 273 and the fourth signal pin 274 are used as spare signal pins and are in a non-electrically connected state.

[0007] Thirdly, a soft-pack lithium battery pack assembled by the bracket 1 and the pole piece connecting plate 2 for assembling a soft-pack lithium battery pack comprises four stacked single soft-pack lithium battery cells 3, wherein the four single soft-pack lithium battery cells 3 are electrically connected through the pole piece connecting plate 2 to form a soft-pack lithium battery pack.

[0008] Preferably, the single soft-pack lithium battery cell 3 is of lithium iron phosphate type, with the positive and negative electrodes on the same side, and a nominal voltage of DC 3.2V, and includes a first battery cell 31, a second battery cell 32, a third battery cell 33 and a fourth battery cell 34; in its assembly, a bracket 1 for assembling a soft-pack lithium battery pack is used to clamp four single soft-pack lithium battery cells 3, and a pole piece connecting plate 2 is installed on the positive and negative electrode sides thereof, and a fixing belt 4 is used to tighten the upper and lower parts of the soft-pack lithium battery pack.

[0009] Further, the structure of the soft-pack lithium battery pack in series is that a negative plug 29 and a positive plug 28 matching the negative electrode slot 23 and the positive electrode slot 24 are used, the positive plug 28 includes a first plug positive pin 281, a second plug positive pin 282, a third plug positive pin 283 and a fourth plug positive pin 284, the negative plug 29 includes a first plug negative pin 291, a second plug negative pin 292, a third plug negative pin 293 and a fourth plug negative pin 294; the first plug negative pin 291 is electrically connected to the second plug positive pin 282 through a wire, the second plug negative pin 292 is electrically connected to the third plug positive pin 283 through a wire, and the third plug negative pin 293 is electrically connected to the fourth plug negative pin 294. It is electrically connected to the positive pin 284 of the fourth plug through a wire, the negative pin 294 of the fourth plug is electrically connected to the negative terminal of the BMS board through a wire, and the positive pin 281 of the first plug is electrically connected to the positive terminal of the BMS board through a wire; a signal acquisition line plug matching the signal line slot 27 is used, wherein the fifth signal pin 275, the sixth signal pin 276, the seventh signal pin 277 and the eighth signal pin 278 are electrically connected to the positive pole of the first battery cell 31, the second battery cell 32, the third battery cell 33 and the fourth battery cell 34, the first signal pin 271 is electrically connected to the negative pole of the first battery cell 31, and is electrically connected to the signal acquisition terminal of the BMS board through the cable where the signal acquisition line plug is located.

[0010] Furthermore, the soft-pack lithium battery pack adopts a parallel structure in which the first plug negative pin 291, the second plug negative pin 292, the third plug negative pin 293 and the fourth plug negative pin 294 are electrically connected to the negative terminal of the BMS board through a wire; the first plug positive pin 281, the second plug positive pin 282, the third plug positive pin 283 and the fourth plug positive pin 284 are electrically connected to the positive terminal of the BMS board through a wire; a signal acquisition line plug matching the signal line slot 27 is used, wherein the fifth signal pin 275, the sixth signal pin 276, the seventh signal pin 277 and the eighth signal pin 278 are electrically connected to the positive pole of the first battery cell 31, the second battery cell 32, the third battery cell 33 and the fourth battery cell 34, the first signal pin 271 is electrically connected to the negative pole of the first battery cell 31, and is electrically connected to the signal acquisition terminal of the BMS board through the cable where the signal acquisition line plug is located.

[0011] Beneficial effects: The bracket for assembling soft-pack lithium battery packs mentioned in the present invention is suitable for the PACK assembly process of a certain batch of soft-pack battery packs, and is equipped with suitable tooling fixtures for assembly production. The assembly bracket ensures that the clamping force of the soft-pack lithium battery pack clamped between the pressure plate 11 and the movable plate 13 is a certain value by adjusting the rotation of the screw 16, which not only meets the production requirements of the fixed value of the external clamping force of batch soft-pack battery packs, but also effectively avoids the damage of the soft-pack lithium battery pack caused by excessive clamping force. The pole piece connecting plate 2 can effectively improve the reliability of the connection of each single cell, and its use facilitates the standardized implementation of the assembly process, thereby improving the reliability of the electrical connection during its use; and the structure of the pole piece connecting plate 2 is adapted to the use of standard plug-in strips, which not only improves production efficiency, but also improves the aesthetics of the battery pack wiring. In the specific embodiments below, the present invention correspondingly gives other beneficial effects of the present invention, which can be referred to in conjunction with the various embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a schematic diagram of a soft-pack lithium battery pack and a bracket; Figure 2 is a schematic diagram of the bracket; Figure 3 It is a schematic diagram of the pole piece connecting plate; Figure 4 This is the wiring diagram of the positive and negative plugs (connected in series); Figure 5 This is the wiring diagram of the positive and negative plugs (in parallel); In the figure: a bracket 1, a pole piece connecting plate 2, a single soft-pack lithium battery cell 3, and a fixing belt 4 for assembling a soft-pack lithium battery pack; The pressing plate 11, the base plate 12, the movable plate 13, the positioning rod 14, the spring 15, the pressure adjusting screw 16, the base 17; the first positioning rod 141, the second positioning rod 142; the first spring 151, the second spring 152; PCB board 21, battery cell electrode hole 22, negative electrode slot 23, positive electrode slot 24, negative electrode printed circuit 25, positive electrode printed circuit 26, signal line slot 27; positive electrode plug 28, negative electrode plug 29; first negative electrode needle 231, second negative electrode needle 232, third negative electrode needle 233, fourth negative electrode needle 234; first positive electrode needle 241, second positive electrode needle 242, third positive electrode needle 243, fourth positive electrode needle 244; first signal needle 271, The second signal pin 272, the third signal pin 273, the fourth signal pin 274, the fifth signal pin 275, the sixth signal pin 276, the seventh signal pin 277, and the eighth signal pin 278; the first plug positive pin 281, the second plug positive pin 282, the third plug positive pin 283, and the fourth plug positive pin 284; the first plug negative pin 291, the second plug negative pin 292, the third plug negative pin 293 and the fourth plug negative pin 294. DETAILED DESCRIPTION

[0014] 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.

[0015] The "electrode connecting plate" mentioned in the present invention means: a PCB circuit board used to connect the positive and negative electrodes of the soft-pack lithium battery during the assembly process of the soft-pack lithium battery pack.

[0016] Embodiment 1: see attached Figure 1 The soft-pack lithium battery pack mentioned in the present invention is formed by stacking four single soft-pack lithium cells 3 electrically connected by a pole piece connecting plate 2. The single soft-pack lithium cell 3 is a lithium iron phosphate type, with the positive and negative poles on the same side, and a nominal voltage of DC 3.2V, and includes a first cell 31, a second cell 32, a third cell 33 and a fourth cell 34. In its assembly, a bracket 1 for assembling a soft-pack lithium battery pack is used to clamp the four single soft-pack lithium cells 3, and pole piece connecting plates 2 are installed on the positive and negative sides thereof, and a fixing belt 4 is used to tighten the upper and lower parts of the soft-pack lithium battery pack.

[0017] Embodiment 2: see attached Figure 3 The specific structure of the electrode connecting plate 2 described in the above embodiment is that it includes a PCB board 21; the PCB board 21 is provided with a cell electrode hole 22 matching the positive and negative electrodes of the stacked four monomer soft-pack lithium battery cells 3, and a negative printed circuit 25 and a positive printed circuit 26 are printed on the surface; the upper and lower parts of the cell electrode hole 22 are provided with a negative electrode slot 23 and a positive electrode slot 24, and a signal line slot 27 is provided in the middle; the negative electrode slot 23 adopts a four-pin slot, and is provided with a first negative electrode pin 231 , a second negative electrode needle 232, a third negative electrode needle 233 and a fourth negative electrode needle 234; the positive electrode slot 24 adopts a four-pin slot, and is provided with a first positive electrode needle 241, a second positive electrode needle 242, a third positive electrode needle 243 and a fourth positive electrode needle 244; the signal line slot 27 adopts an eight-pin slot, and is provided with a first signal needle 271, a second signal needle 272, a third signal needle 273, a fourth signal needle 274, a fifth signal needle 275, a sixth signal needle 276, a seventh signal needle 277 and an eighth signal needle 278.

[0018] The negative electrodes of the first battery cell 31, the second battery cell 32, the third battery cell 33 and the fourth battery cell 34 are electrically connected to the negative printed circuit 25, and then electrically connected to the first negative electrode needle 231, the second negative electrode needle 232, the third negative electrode needle 233 and the fourth negative electrode needle 234; the positive electrodes of the first battery cell 31, the second battery cell 32, the third battery cell 33 and the fourth battery cell 34 are electrically connected to the positive printed circuit 26, and then electrically connected to the first positive electrode needle 241, the second positive electrode needle 242, the third positive electrode needle 243 and the fourth positive electrode needle 244. The fifth signal pin 275, the sixth signal pin 276, the seventh signal pin 277 and the eighth signal pin 278 of the signal line slot 27 are electrically connected to the first positive pin 241, the second positive pin 242, the third positive pin 243 and the fourth positive pin 244 through the positive printed circuit 26, and the first signal pin 271 is electrically connected to the first negative pin 231 through the negative printed circuit 25, and the second signal pin 272, the third signal pin 273 and the fourth signal pin 274 are used as spare signal pins and are in a non-electrically connected state.

[0019] After the electrode connecting plate 2 inserts the positive and negative electrodes of each single soft-pack lithium battery cell 3 into the battery cell electrode hole 22, it is reliably connected to the negative printed circuit 25 and the positive printed circuit 26 by welding. This structure has reliable fixation and is convenient for standardized implementation of the assembly process, thereby improving the reliability of electrical connection during its use.

[0020] Embodiment 3: see attached Figure 2The specific structure of the bracket 1 for assembling a soft-pack lithium battery pack described in the above embodiment is that it includes a pressing plate 11; through holes for installing a positioning rod 14 are opened at the upper and lower ends of the pressing plate 11, and a base 17 is provided in the middle of the right side thereof, and the base 17 can be installed and connected in cooperation with other external components to meet the connection needs of the on-site assembly workbench; a limiting ring is provided at the right end of the positioning rod 14, including a first positioning rod 141 and a second positioning rod 142; a spring 15 is installed between the limiting ring and the pressing plate 11, and the spring 15 includes a first spring 151 and a second spring 152; after the first positioning rod 141 passes through the lower through hole where the movable plate 13 is located, its left end is connected and fixed to the lower part of the base plate 12; after the second positioning rod 142 passes through the upper through hole where the movable plate 13 is located, its left end is connected and fixed to the upper part of the base plate 12; a screw hole for installing a pressure adjusting screw 16 is provided in the middle of the base plate 12; the right end of the pressure adjusting screw 16 is fixedly pressed at the middle position of the left side of the movable plate 13.

[0021] When the pressure adjusting screw 16 is rotated, it moves left and right along the screw hole where the base plate 12 is located, thereby driving the movable plate 13 to follow; when the movable plate 13 moves to the right, the four stacked single soft-pack lithium battery cells 3 clamped between the movable plate 13 and the pressure plate 11 are clamped by force, and when the movable plate 13 moves to the left, the battery cells can be disassembled. Since the pressure plate 11 is simultaneously subjected to the pressure of the spring 15, the pressure value becomes a fixed value due to the deformation length of the spring, and the deformation length can correspond to the rightward movement length value of the pressure adjusting screw 16. Therefore, by controlling the rightward movement length of the pressure adjusting screw 16, the clamping pressure of the stacked four single soft-pack lithium battery cells 3 is achieved in a fixed pressure value manner; during the assembly process, setting a suitable clamping pressure value can not only achieve the reliability of clamping, so as to facilitate the welding operation of the positive and negative electrodes of the battery cell and the electrode connecting plate 2, but also avoid the surface damage of the single soft-pack lithium battery cell 3 that may be caused by the uncertainty of excessive pressure.

[0022] The formula for the above clamping pressure is: P = R × F (Formula 1) Where: P refers to the clamping force; R refers to the stiffness of the spring; F refers to the deformation length of the spring; The rightward movement length of the pressure regulating screw 16 is equal to F.

[0023] As a preferred implementation of the above embodiment, a scale is engraved on the side surface of one of the first positioning rod 141 or the second positioning rod 142 for measuring the length moved by the movable plate 13, and the length value can be converted into clamping pressure.

[0024] Example 4: The implementation method of the above soft-pack lithium battery pack in series or parallel is as follows: (I) Series connection can obtain high voltage power output, see attached Figure 4: A negative plug 29 and a positive plug 28 matching the negative slot 23 and the positive slot 24 are used, wherein the positive plug 28 includes a first plug positive pin 281, a second plug positive pin 282, a third plug positive pin 283 and a fourth plug positive pin 284, and the negative plug 29 includes a first plug negative pin 291, a second plug negative pin 292, a third plug negative pin 293 and a fourth plug negative pin 294. The first plug negative pin 291 is electrically connected to the second plug positive pin 282 through a wire, the second plug negative pin 292 is electrically connected to the third plug positive pin 283 through a wire, the third plug negative pin 293 is electrically connected to the fourth plug positive pin 284 through a wire, the fourth plug negative pin 294 is electrically connected to the negative terminal where the BMS board is located through a wire, and the first plug positive pin 281 is electrically connected to the positive terminal where the BMS board is located through a wire.

[0025] A signal acquisition line plug matching the signal line slot 27 is used, wherein the fifth signal pin 275, the sixth signal pin 276, the seventh signal pin 277 and the eighth signal pin 278 are electrically connected to the positive poles of the first battery cell 31, the second battery cell 32, the third battery cell 33 and the fourth battery cell 34, the first signal pin 271 is electrically connected to the negative pole of the first battery cell 31, and is electrically connected to the signal acquisition terminal of the BMS board through the cable where the signal acquisition line plug is located.

[0026] The wires used by the negative plug 29 and the positive plug 28 are wire rows, which have the advantages of neat and orderly wiring and improve the space utilization effect. The electric energy of the soft-pack lithium battery pack is output to the BMS board through the negative plug 29 and the positive plug 28, and the power management function of the external load is realized through the BMS board.

[0027] (II) Parallel connection can obtain high current power output, see attached Figure 5 : The first plug negative electrode pin 291, the second plug negative electrode pin 292, the third plug negative electrode pin 293 and the fourth plug negative electrode pin 294 are electrically connected to the negative terminal of the BMS board through a wire; the first plug positive electrode pin 281, the second plug positive electrode pin 282, the third plug positive electrode pin 283 and the fourth plug positive electrode pin 284 are electrically connected to the positive terminal of the BMS board through a wire. A signal acquisition line plug matching the signal line slot 27 is used, wherein the fifth signal pin 275, the sixth signal pin 276, the seventh signal pin 277 and the eighth signal pin 278 are electrically connected to the positive pole of the first battery cell 31, the second battery cell 32, the third battery cell 33 and the fourth battery cell 34, the first signal pin 271 is electrically connected to the negative pole of the first battery cell 31, and is electrically connected to the signal acquisition terminal of the BMS board through the cable where the signal acquisition line plug is located.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bracket for assembling a soft-pack lithium battery pack, characterized in that: The pressure plate (11) comprises a pressure plate (11); through holes for mounting a positioning rod (14) are provided at the upper and lower ends of the pressure plate (11); a base (17) is provided at the middle of the right side thereof, and the base (17) is mounted and connected with other external components in cooperation; a limiting ring is provided at the right end of the positioning rod (14), and the limiting ring comprises a first positioning rod (141) and a second positioning rod (142); a spring (15) is installed between the limiting ring and the pressure plate (11), and the spring (15) comprises a first spring (151) and a second spring (152). 152); after the first positioning rod (141) passes through the lower through hole where the movable plate (13) is located, its left end is connected to and fixed to the lower part of the base plate (12); after the second positioning rod (142) passes through the upper through hole where the movable plate (13) is located, its left end is connected to and fixed to the upper part of the base plate (12); a screw hole for mounting a pressure adjustment screw (16) is provided in the middle of the base plate (12); the right end of the pressure adjustment screw (16) is fixedly pressed at the middle position of the left side of the movable plate (13).

2. A bracket for assembling a soft-pack lithium battery pack according to claim 1, characterized in that: The method for controlling the clamping pressure of a soft-pack lithium battery pack by using the bracket for assembling a soft-pack lithium battery pack comprises the following steps: Step 1: Place the pressure test device between the pressure plate (11) and the movable plate (13), rotate the adjusting screw (16) to move the movable plate (13) toward the pressure plate (11), and when the spring (15) is in the initial compression state, that is, when the pressure value of the pressure test device changes, stop rotating the adjusting screw (16) and record the initial position of the adjusting screw (16); Step 2: Continue to rotate the adjusting screw (16), read the pressure value of the pressure test device at the same time, and record the screw-in positions of the adjusting screw (16) corresponding to different pressure values, so as to obtain a pressure position comparison table of the pressure value and the screw-in position of the adjusting screw (16); Step 3: Remove the pressure test device and replace it with a soft-pack lithium battery pack; Step 4: According to the external force value recommended for the soft-pack lithium battery pack and referring to the pressure position comparison table, the adjusting screw (16) is rotated to the corresponding screw-in position to fix the soft-pack lithium battery pack; the external force value recommended for the soft-pack lithium battery pack is equal to the force applied to the spring (15).

3. A bracket for assembling a soft-pack lithium battery pack according to claim 2, characterized in that: The pressure testing device adopts a column pressure gauge tester.

4. A bracket for assembling a soft-pack lithium battery pack according to claim 1, characterized in that: A soft-pack lithium battery pack assembled using the bracket for assembling a soft-pack lithium battery pack, the soft-pack lithium battery pack involving a pole piece connecting plate (2) for connecting each single soft-pack lithium battery cell, the pole piece connecting plate (2) comprising a PCB board (21); a cell pole piece hole (22) matching the positive and negative poles of four stacked single soft-pack lithium battery cells (3) is provided on the PCB board (21) for inserting the positive and negative poles of each single soft-pack lithium battery cell (3); and a negative pole printed circuit (25) and a positive pole printed circuit (26) are printed on the surface of the PCB board (21); a negative pole slot (23) and a positive pole slot (26) are provided at the upper and lower parts of the cell pole piece hole (22). The negative electrode slot (23) is a four-pin slot, provided with a first negative electrode pin (231), a second negative electrode pin (232), a third negative electrode pin (233) and a fourth negative electrode pin (234); the positive electrode slot (24) is a four-pin slot, provided with a first positive electrode pin (241), a second positive electrode pin (242), a third positive electrode pin (243) and a fourth positive electrode pin (244); the signal line slot (27) is an eight-pin slot, provided with a first signal pin (271), a second signal pin (272), a third signal pin (273), a fourth signal pin (274), a fifth signal pin ( 275), a sixth signal pin (276), a seventh signal pin (277) and an eighth signal pin (278); the soft-pack lithium battery pack includes a first battery cell (31), a second battery cell (32), a third battery cell (33) and a fourth battery cell (34); the negative poles of the battery cells are electrically connected to the negative electrode printed circuit (25) and are further electrically connected to the first negative electrode pin (231), the second negative electrode pin (232), the third negative electrode pin (233) and the fourth negative electrode pin (234); the positive poles of the first battery cell (31), the second battery cell (32), the third battery cell (33) and the fourth battery cell (34) are electrically connected to the positive electrode printed circuit (26) The first positive electrode pin (241) and the second positive electrode pin (242) are electrically connected to the first positive electrode pin (241), the second positive electrode pin (242), the third positive electrode pin (243) and the fourth positive electrode pin (244); the fifth signal pin (275), the sixth signal pin (276), the seventh signal pin (277) and the eighth signal pin (278) where the signal line slot (27) is located are electrically connected to the first positive electrode pin (241), the second positive electrode pin (242), the third positive electrode pin (243) and the fourth positive electrode pin (244) via the positive printed circuit (26); the first signal pin (271) where the first signal pin (271) is located is electrically connected to the first negative electrode pin (231) via the negative printed circuit (25).

5. A bracket for assembling a soft-pack lithium battery pack according to claim 4, characterized in that: A soft-pack lithium battery pack assembled using the bracket (1) and the pole piece connecting plate (2) for assembling a soft-pack lithium battery pack comprises four stacked single soft-pack lithium battery cells (3), wherein the four single soft-pack lithium battery cells (3) are electrically connected via the pole piece connecting plate (2) to form a soft-pack lithium battery pack.

6. A bracket for assembling a soft-pack lithium battery pack according to claim 5, characterized in that: The single soft-pack lithium battery cell (3) is of lithium iron phosphate type, with the positive and negative electrodes on the same side and a nominal voltage of DC 3.2V. In its assembly, a bracket (1) for assembling a soft-pack lithium battery pack is used to clamp four single soft-pack lithium battery cells (3), and pole connecting plates (2) are installed on the positive and negative electrode sides of the single soft-pack lithium battery cells, and a fixing belt (4) is used to tighten the upper and lower parts of the soft-pack lithium battery pack.

7. A bracket for assembling a soft-pack lithium battery pack according to any one of claims 5 or 6, characterized in that: The soft-pack lithium battery pack assembled by the bracket for assembling a soft-pack lithium battery pack adopts a series structure in which a negative plug (29) and a positive plug (28) matching the negative electrode slot (23) and the positive electrode slot (24) are adopted, the positive plug (28) comprising a first plug positive electrode pin (281), a second plug positive electrode pin (282), a third plug positive electrode pin (283) and a fourth plug positive electrode pin (284), the negative plug (29) comprising a first plug negative electrode pin (291), a second plug negative electrode pin (292), a third plug negative electrode pin (293) and a fourth plug negative electrode pin (294); the first plug negative electrode pin (291) is electrically connected to the second plug positive electrode pin (282) through a wire, the second plug negative electrode pin (292) is electrically connected to the third plug positive electrode pin (283) through a wire, the The negative electrode pin (293) of the third plug is electrically connected to the positive electrode pin (284) of the fourth plug through a wire, the negative electrode pin (294) of the fourth plug is electrically connected to the negative electrode terminal of the BMS board through a wire, and the positive electrode pin (281) of the first plug is electrically connected to the positive electrode terminal of the BMS board through a wire; a signal acquisition line plug matching the signal line slot (27) is used, wherein the fifth signal pin (275), the sixth signal pin (276), the seventh signal pin (277) and the eighth signal pin (278) are electrically connected to the positive electrode of the first battery cell (31), the second battery cell (32), the third battery cell (33) and the fourth battery cell (34), the first signal pin (271) is electrically connected to the negative electrode of the first battery cell (31), and is electrically connected to the signal acquisition terminal of the BMS board through the wiring of the signal acquisition line plug.

8. A bracket for assembling a soft-pack lithium battery pack according to any one of claims 5 or 6, characterized in that: The soft-pack lithium battery pack assembled by the bracket for assembling a soft-pack lithium battery pack adopts a parallel structure in which the first plug negative electrode pin (291), the second plug negative electrode pin (292), the third plug negative electrode pin (293) and the fourth plug negative electrode pin (294) are electrically connected to the negative terminal of the BMS board through a wire; the first plug positive electrode pin (281), the second plug positive electrode pin (282), the third plug positive electrode pin (283) and the fourth plug positive electrode pin (284) are electrically connected to the positive terminal of the BMS board through a wire. Connection; using a signal acquisition line plug that matches the signal line slot (27), wherein the fifth signal pin (275), the sixth signal pin (276), the seventh signal pin (277) and the eighth signal pin (278) are electrically connected to the positive poles of the first battery cell (31), the second battery cell (32), the third battery cell (33) and the fourth battery cell (34), the first signal pin (271) is electrically connected to the negative pole of the first battery cell (31), and the signal acquisition line plug is electrically connected to the signal acquisition terminal of the BMS board through the flat cable.

9. The bracket for assembling a soft-pack lithium battery pack according to claim 1, characterized in that: A scale is engraved on the side surface of one of the first positioning rod 141 or the second positioning rod 142 .

Images