Battery cell batch storage and charging device

Abstract

The utility model relates to the technical field of lithium batteries, and provides a battery cell batch storage and charging device which comprises a box body, a charging battery cell, a plurality of square shell battery cells and a parallel busbar assembly, one side of the box body is closed, the other side of the box body is provided with an opening, a first cavity and a second cavity are arranged in the box body, and the first cavity is not communicated with the second cavity; the charging cell is arranged in the first cavity; the plurality of square shell battery cells are arranged in the second cavity; the parallel busbar assembly is arranged at the opening of the box body, the parallel busbar assembly is provided with a plurality of connecting ends, and the plurality of connecting ends of the parallel busbar assembly are detachably connected with the electricity supplementing battery cell and the electrodes of all the square-shell battery cells respectively and used for enabling the electricity supplementing battery cell to selectively supplement electricity to the corresponding square-shell battery cells which are powered down; according to the battery cell batch storage and power supply device, power failure of the storage battery cells can be processed in batches through the arranged power supply battery cells, the situation that follow-up battery cell assembly is poor in consistency is avoided, capacity grading and matching do not need to be conducted again, time and labor are saved, and therefore the practicability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field especially relates to a kind of electric core batch storage power supply device. BACKGROUND

[0002] In the transportation and storage process of square shell electric core, in order to ensure safety, it is usually subjected to conventional capacity grading treatment. Capacity grading refers to detecting the quality and performance of the battery through a specific charge and discharge method. During this process, the capacity, voltage and internal resistance of the electric core are recorded in detail, which helps to evaluate the quality of the electric core and provides important reference information for the subsequent battery management system. In order to ensure the safety of transportation and storage, the square shell electric core is usually shipped at 20% SOC or 50% SOC during conventional capacity grading, in order to avoid the safety hazards caused by excessive or insufficient power.

[0003] A storage frame and an electric core packaging box with publication number CN217146842U are disclosed. The storage frame includes a frame, horizontal partitions and filler blocks. The two ends of the horizontal partitions extend to the two inner walls of the frame along its width direction. Multiple horizontal partitions are arranged in the frame and separate the inside of the frame into multiple accommodation cavities. The filler blocks are arranged in the accommodation cavities and form a clamping groove with the accommodation cavities. The electric core packaging box includes a box body and the above-mentioned storage frame. When the electric core with a welding adapter plate is stored in the accommodation cavity, the electric core is clamped in the clamping groove, the adapter plate is overlapped on the upper end surface of the filler block, and the horizontal partitions isolate each electric core in the corresponding accommodation cavity, so that the electric cores and the adapter plates of the electric cores do not contact or collide with the adapter plates of other electric cores, avoiding short circuit of the electric cores.

[0004] However, the electric cores in the existing electric core packaging box cannot be immediately assembled during transportation to the customer site due to various reasons, resulting in long-term placement of the electric cores. Due to the electrochemical self-discharge of the electric cores, the consistency of the subsequent electric core assembly is poor. The conventional solution to this problem is to re-perform capacity grading and grouping, but this process requires a large amount of manpower, material resources and financial resources, thereby reducing the practicality. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides an electric core batch storage power supply device, which can batch process and store power supply electric cores, avoid poor consistency of subsequent electric core assembly, and does not need to re-perform capacity grading and grouping, saving time and effort, thereby improving practicality.

[0006] The technical solution of the utility model is as follows: the utility model provides an electric core batch storage power supply device, which includes a box body, a power supply electric core, a plurality of square shell electric cores and a parallel bus bar assembly, wherein,

[0007] One side of the box body is closed, the other side is provided with an opening, and the first cavity and the second cavity are arranged in the box body, and the first cavity and the second cavity are not communicated.

[0008] The supplementary power cell is arranged in the first cavity; and the plurality of square shell cells are arranged in the second cavity;

[0009] The parallel busbar assembly is arranged at the opening of the box body, and has a plurality of connecting ends; the plurality of connecting ends of the parallel busbar assembly are respectively detachably connected between the electrodes of the supplementary power cell and each square shell cell, so as to selectively supply power to the corresponding power-off square shell cell by the supplementary power cell.

[0010] On the basis of the above technical scheme, preferably, the first cavity is provided with a first partition plate and a plurality of second partition plates, the plurality of second partition plates are arranged on both sides of the first partition plate, and the first cavity is divided into a plurality of sub-cavities; the plurality of square shell cells are arranged in the sub-cavities.

[0011] On the basis of the above technical scheme, preferably, the two side end faces of the first partition plate are in abutment with the inner wall of the first cavity, and the plurality of second partition plates on the same side are arranged at equal intervals along the length direction of the first partition plate.

[0012] On the basis of the above technical scheme, preferably, the plurality of flexible members are arranged between the square shell cells and the inner wall of the sub-cavity, and between the supplementary power cell and the inner wall of the first cavity, so as to limit the positions of the square shell cells and the supplementary power cell.

[0013] On the basis of the above technical scheme, preferably, the number of flexible members arranged on each side wall of the first cavity and the sub-cavity is at least two, and the at least two flexible members are symmetrically arranged with the height center line of the square shell cell.

[0014] On the basis of the above technical scheme, preferably, the box body is further provided with a cover plate, wherein the cover plate is arranged on one side of the opening of the box body, and the size of the cover plate matches the size of the first cavity, so as to encapsulate the square shell cells.

[0015] On the basis of the above technical scheme, preferably, the parallel busbar assembly comprises a plurality of first connecting pieces, a plurality of second connecting pieces and a flexible circuit board, wherein the plurality of first connecting pieces are respectively magnetically fixed with the positive electrode pieces of each square shell cell and the supplementary power cell, the plurality of second connecting pieces are respectively magnetically fixed with the negative electrode pieces of each square shell cell and the supplementary power cell, the flexible circuit board is arranged in the first cavity, and the plurality of first connecting pieces and the plurality of second connecting pieces are electrically connected with the corresponding contacts of the flexible circuit board, so as to parallelly connect the supplementary power cell and each square shell cell.

[0016] On the basis of the above technical scheme, preferably, recesses are formed on the positive electrode plates and the negative electrode plates of the square shell battery cells and the power supplementing battery cells, the first connecting plates and the second connecting plates are provided with protruding portions on the sides away from the flexible circuit board, the sizes of the protruding portions match the sizes of the recesses, and the protruding portions abut in the recesses to position the connecting plates and the electrode plates.

[0017] On the basis of the above technical scheme, preferably, the flexible circuit board is provided with a connecting circuit, the connecting circuit comprises a first switch and a plurality of second switches, the first connecting plate connected to the positive electrode plate of the power supplementing battery cell is electrically connected to the first switch, the other end of the first switch is electrically connected to one end of each of the second switches, the other end of each of the second switches is electrically connected to the first connecting plate connected to the positive electrode plate of the corresponding square shell battery cell, the second connecting plate connected to the negative electrode plate of the power supplementing battery cell is electrically connected to the second connecting plate connected to the negative electrode plate of each of the square shell battery cells, and the control ends of the first switch and the plurality of second switches are electrically connected to the BMS battery system.

[0018] On the basis of the above technical scheme, preferably, the first switch and the second switch are MOS tubes.

[0019] The power cell batch storage power supplementing device of the utility model has the following beneficial effects relative to the prior art:

[0020] (1) The power supplementing battery cells and the parallel busbar assembly are arranged to batch process the power storage cell power failure problem, avoid poor consistency of subsequent cell assembly, do not need to re-perform capacity matching and grouping, save time and effort, and thus improve practicality.

[0021] (2) The first cavity is divided into a plurality of independent sub-cavities by the first partition plate and the plurality of second partition plates, one square shell battery cell can be placed in each sub-cavity, direct contact between the battery cells is effectively avoided, the safety risk caused by physical collision or short circuit between the battery cells is reduced, and the flexible member can provide stable limiting effect, so that the battery cell is prevented from tilting or shaking, and thus the stability of the battery cell in the sub-cavity is improved.

[0022] (3) The connecting plate and the electrode plate are fixed by magnetic attraction, the connection efficiency is improved, and the connecting plate and the electrode plate are convenient to disassemble and maintain, meanwhile, the protruding portions and the recesses arranged on the connecting plate and the electrode plate respectively, and the protruding portions abut in the recesses, so that the connecting plate can abut on the specified position of the electrode plate of the battery cell accurately, misplacement and deviation in the connection process are avoided, and the connection precision and reliability are improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings described below are only some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0024] Figure 1 It is a perspective view of the battery cell bulk storage power supply device of the present application.

[0025] Figure 2 It is a box structure perspective view of the battery cell bulk storage power supply device of the present application.

[0026] Figure 3 It is a box structure top view of the battery cell bulk storage power supply device of the present application.

[0027] Figure 4 It is a sub-cavity structure sectional view of the battery cell bulk storage power supply device of the present application.

[0028] Figure 5 It is a parallel busbar assembly structure bottom view of the battery cell bulk storage power supply device of the present application.

[0029] Figure 6 It is a connection circuit diagram of the battery cell bulk storage power supply device of the present application.

[0030] Figure 7 It is a top view of the battery cell bulk storage power supply device of the present application.

[0031] In the figure: 1, box; 2, power supply battery cell; 3, square shell battery cell; 4, parallel busbar assembly; 100, first cavity; 200, second cavity; 120, sub-cavity; 5, flexible piece; 6, cover plate; 41, first connecting piece; 42, second connecting piece; 400, groove; 410, protruding part; 421, first switch; 422, second switch. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0033] As Figures 1-7As shown, the utility model discloses a kind of electric core batch storage power supply devices, including box 1, power supply electric core 2, several square shell electric core 3 and parallel busbar assembly 4, wherein, box 1 one side is closed, and the other side is equipped with opening, and box 1 is equipped with first cavity 100 and second cavity 200, first cavity 100 is not communicated with second cavity 200;Power supply electric core 2 is arranged in first cavity 100;Several square shell electric core 3 are arranged in second cavity 200;Parallel busbar assembly 4 is arranged at the opening of box 1, and parallel busbar assembly 4 has multiple connecting ends, and the multiple connecting ends of parallel busbar assembly 4 are respectively detachably connected between power supply electric core 2 and the electrode of each square shell electric core 3, for selectively making power supply electric core 2 power supply corresponding power failure square shell electric core 3.

[0034] It needs to be explained that box 1 is divided into first cavity 100 and second cavity 200, and the two are not communicated, to isolate power supply electric core 2 and square shell electric core 3 to be powered, to avoid potential short-circuit risk;Power supply electric core 2 is installed in first cavity 100, as power supply unit, provides electric quantity for power failure square shell electric core 3, and parallel busbar assembly 4 has multiple connecting ends, for connecting the electrode of power supply electric core 2 and each square shell electric core 3, and parallel busbar assembly 4 uses parallel circuit design, so that power supply electric core 2 can simultaneously or selectively power supply multiple square shell electric core 3.

[0035] In the embodiment, power supply electric core 2 is used to power supply power failure square shell electric core 3, to avoid the situation that subsequent electric core assembly consistency is poor due to self-discharge of long-term placed electric core, and through parallel busbar assembly 4, power supply electric core 2 can simultaneously or selectively power supply multiple power failure square shell electric core 3, to greatly improve power supply efficiency.

[0036] First partition plate 11 and several second partition plates 12 are arranged in first cavity 100 in the embodiment, and several second partition plates 12 are divided and arranged on the two sides of first partition plate 11, to divide first cavity 100 and form multiple sub-cavities 120;Several square shell electric core 3 are divided and arranged in each sub-cavity 120.

[0037] It needs to be explained that first cavity 100 is divided into multiple independent sub-cavities 120 by first partition plate 11 and several second partition plates 12, and one square shell electric core 3 can be placed in each sub-cavity 120, to effectively avoid direct contact between electric cores, to reduce safety risk caused by physical collision or short circuit between electric cores, and the existence of partition plate also provides certain degree of physical support and protection for electric core, to enhance the stability of electric core in storage and transportation process, to reduce damage risk caused by vibration or impact.

[0038] The two side end faces of first partition plate 11 in the embodiment are all abutted with the inner wall of first cavity 100, and same side several second partition plates 12 are equidistantly arranged along the length direction of first partition plate 11.

[0039] In this embodiment, a plurality of flexible members 5 are further included, wherein the prismatic battery cell 3 is spaced apart from the inner wall of the sub-cavity 120, the supplementary battery cell 2 is spaced apart from the inner wall of the first cavity 100, and the plurality of flexible members 5 are arranged between the prismatic battery cell 3 and the inner wall of the sub-cavity 120 and between the supplementary battery cell 2 and the inner wall of the first cavity 100, for limiting the positions of the prismatic battery cell 3 and the supplementary battery cell 2.

[0040] It should be noted that by arranging the flexible members 5 between the prismatic battery cell 3 and the inner wall of the sub-cavity 120 and between the supplementary battery cell 2 and the inner wall of the first cavity 100, the positions of the prismatic battery cell 3 and the supplementary battery cell 2 can be effectively limited. This limiting method not only ensures the stability of the battery cells during storage and power compensation, but also avoids safety hazards caused by the shaking or displacement of the battery cells. In addition, the flexible members 5 have certain elasticity and buffering performance, which can play a shock-absorbing role when the battery cells are subjected to external impact or vibration, thereby protecting the battery cells from damage.

[0041] In this embodiment, the number of flexible members 5 arranged on each side wall of the first cavity 100 and the sub-cavity 120 is at least two, and the at least two flexible members 5 are symmetrically arranged with the height center line of the prismatic battery cell 3.

[0042] It should be noted that the flexible members 5 are symmetrically arranged with the height center line of the prismatic battery cell 3, which can ensure that the battery cells are balancedly supported in the vertical direction. Regardless of how the battery cells move during storage or charging and discharging, the symmetrically arranged flexible members 5 can provide stable limiting effect to prevent the battery cells from tilting or shaking, thereby enhancing the stability of the battery cells in the sub-cavity 120.

[0043] In this embodiment, a cover plate 6 is further included, wherein the cover plate 6 is arranged on the opening side of the box body 1, and the size of the cover plate 6 matches the size of the first cavity 100, for packaging the prismatic battery cell 3.

[0044] It should be noted that the size of the cover plate 6 matches the size of the first cavity 100, and the cover plate 6 can tightly cover the opening side of the box body 1, so that the prismatic battery cell 3 in the first cavity 100 forms a closed space, ensuring that the prismatic battery cell 3 is completely packaged in the first cavity 100 during storage and power compensation, and avoiding interference and damage of the external environment to the battery cell.

[0045] The parallel busbar assembly 4 in the embodiment includes a plurality of first connecting pieces 41, a plurality of second connecting pieces 42 and a flexible circuit board 43, wherein the plurality of first connecting pieces 41 are respectively fixedly connected to the positive electrode tabs of the prismatic battery cells 3 and the supplementary battery cell 2 by magnetic attraction, the plurality of second connecting pieces 42 are respectively fixedly connected to the negative electrode tabs of the prismatic battery cells 3 and the supplementary battery cell 2 by magnetic attraction, the flexible circuit board 43 is arranged in the first cavity 100, and the plurality of first connecting pieces 41 and the plurality of second connecting pieces 42 are electrically connected to the corresponding contacts of the flexible circuit board 43, so as to realize parallel connection between the supplementary battery cell 2 and the prismatic battery cells 3.

[0046] It should be noted that the magnetic attraction fixing mode not only simplifies the connection process, improves the connection efficiency, ensures the stable contact between the connecting pieces and the electrode tabs of the battery cells, but also facilitates disassembly and maintenance. The magnetic attraction force enables the connecting pieces to be closely attached to the electrode tabs of the battery cells, so that stable connection state can be maintained even in harsh environments such as vibration or impact, ensuring stable transmission of current and improving the overall performance and safety of the battery pack. The flexible circuit board 43 is arranged to integrate the parallel circuit, thereby improving the space utilization.

[0047] The prismatic battery cells 3 and the supplementary battery cell 2 in the embodiment are provided with recesses 400 on the positive electrode tabs and the negative electrode tabs, and the plurality of first connecting pieces 41 and the plurality of second connecting pieces 42 are provided with protruding portions 410 on the sides away from the flexible circuit board 43. The size of the protruding portions 410 matches the size of the recesses 400, and the protruding portions 410 are abutted in the recesses 400, so as to position the connecting pieces and the electrode tabs.

[0048] It should be noted that the protruding portions 410 are arranged to abut in the recesses 400, so that the connecting pieces can be accurately abutted on the specified positions of the electrode tabs of the battery cells, avoiding mispositioning and deviation during the connection process, and improving the connection accuracy and reliability.

[0049] The flexible circuit board 42 in the embodiment is provided with a connection circuit, which includes a first switch 421 and a plurality of second switches 422. The first connecting piece 41 connected to the positive electrode tab of the supplementary battery cell 2 is electrically connected to the first switch 421, one end of the first switch 421 is electrically connected to one end of each second switch 422, the other end of each second switch 422 is electrically connected to the first connecting piece 41 connected to the positive electrode tab of the corresponding prismatic battery cell 3, the second connecting piece 42 connected to the negative electrode tab of the supplementary battery cell 2 is electrically connected to the second connecting piece 42 connected to the negative electrode tab of each prismatic battery cell 3, and the control ends of the first switch 421 and the plurality of second switches 422 are electrically connected to the BMS battery system.

[0050] It should be noted that the flexible circuit board 42 is an FPCB, and the BMS battery system is electrically connected with the collection end of each square shell battery cell 3 and the compensation battery cell 2, for collecting the electric quantity and state of each battery cell. When it is monitored that the electric quantity of the plurality of square shell battery cells 3 is lower than the set first threshold value, the first switch 421 and the second switch 422 connected with the square shell battery cell 3 corresponding to the power failure are opened in sequence according to the position sequence, and it is monitored whether the electric quantity of the compensation battery cell 2 is lower than the set second threshold value. When it is monitored that the electric quantity of the compensation battery cell 2 is lower than the second threshold value, at this time the compensation battery cell 2 cannot compensate the power failure of the square shell battery cell 3, the BMS battery system controls to close the first switch 421 and the second switch 422, and reminds the external personnel to charge the compensation battery cell 2. When it is monitored that the electric quantity of the compensation battery cell 2 is higher than the second threshold value, at this time the BMS battery system opens the first switch 421 and the second switch 422 connected with the square shell battery cell 3 corresponding to the power failure, at this time the compensation battery cell 2 compensates the power failure of the square shell battery cell 3, and when the square shell battery cell 3 reaches the upper limit threshold value of the electric quantity, the first switch 421 and the second switch 422 are closed.

[0051] It can be understood that the battery management system BMS ensures that the electric quantity transmission between the battery cells is unidirectional, and the electric quantity will not flow from the low electric quantity battery cell to the high electric quantity battery cell.

[0052] The first switch 421 and the second switch 422 in the embodiment are both MOS tubes.

[0053] Working principle:

[0054] In the initial state, the compensation battery cell 2 is placed in the first cavity 100 and is in the standby state, and the plurality of square shell battery cells 3 are placed in the second cavity 200 and are independently arranged; the connection end of the parallel busbar assembly 4 is in the non-conduction state with the electrodes of the compensation battery cell 2 and the square shell battery cells 3.

[0055] In the monitoring state, the BMS battery system starts to work and monitors the electric quantity state of the compensation battery cell 2 and the square shell battery cells 3 in real time. When it is monitored that the electric quantity of a certain square shell battery cell 3 is lower than the set first threshold value, the BMS system judges that the battery cell needs compensation.

[0056] In the compensation state, the BMS system checks whether the electric quantity of the compensation battery cell 2 is higher than the set second threshold value, so as to ensure that the compensation battery cell 2 has sufficient electric quantity for compensation. If the electric quantity of the compensation battery cell 2 is sufficient, the BMS system controls the parallel busbar assembly 4 to connect the compensation battery cell 2 and the square shell battery cell 3 which needs compensation through the parallel busbar assembly 4.

[0057] When executing: under the control of the BMS system, the first switch 421 and the corresponding second switch 422 are closed, the current flows out from the positive electrode of the power compensation battery 2, flows into the positive electrode of the square battery 3 which needs power compensation through the connecting circuit on the parallel busbar assembly 4 and the flexible circuit board 42, at the same time, the negative electrode of the power compensation battery 2 and the negative electrode of the square battery 3 which needs power compensation are also connected through the parallel busbar assembly 4, forming a complete current loop, with the flow of current, the power of the square battery 3 which needs power compensation gradually increases until reaching the set upper limit threshold value of the power, when the BMS system monitors that the power of the square battery 3 which needs power compensation has reached the upper limit threshold value, it controls the first switch 421 and the second switch 422 to be disconnected.

[0058] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery storage power supply device for a plurality of battery cells, characterized by, Including box (1), power supply battery (2), several square shell batteries (3) and parallel busbar assembly (4), wherein, The box (1) is closed on one side and has an opening on the other side, and the box (1) is provided with a first cavity (100) and a second cavity (200), and the first cavity (100) and the second cavity (200) are not communicated; The power supply battery (2) is arranged in the first cavity (100); the several square shell batteries (3) are arranged in the second cavity (200); The parallel busbar assembly (4) is arranged at the opening of the box (1), and the parallel busbar assembly (4) has a plurality of connecting ends, and the plurality of connecting ends of the parallel busbar assembly (4) are respectively detachably connected between the electrode of the power supply battery (2) and each square shell battery (3), for selectively supplying power to the corresponding square shell battery (3) which is powered off.

2. The battery pack storage power supply device for electric cells according to claim 1, wherein: The first cavity (100) is provided with a first partition plate (11) and a plurality of second partition plates (12), and the plurality of second partition plates (12) are arranged on both sides of the first partition plate (11) to divide the first cavity (100) into a plurality of sub-cavities (120); the plurality of square shell batteries (3) are arranged in each sub-cavity (120).

3. The battery pack storage power supply device according to claim 2, wherein: The both side end faces of the first partition plate (11) abut against the inner wall of the first cavity (100), and the plurality of second partition plates (12) on the same side are arranged at equal intervals along the length direction of the first partition plate (11).

4. The battery pack storage power supply device of claim 2, wherein: Further comprising a plurality of flexible members (5), wherein the square shell batteries (3) are arranged at intervals with the inner wall of the sub-cavity (120), the power supply battery (2) is arranged at intervals with the inner wall of the first cavity (100), and the plurality of flexible members (5) are arranged between each square shell battery (3) and the inner wall of the sub-cavity (120) and between the power supply battery (2) and the inner wall of the first cavity (100), for limiting the position of the square shell battery (3) and the power supply battery (2).

5. The bulk storage power supply of claim 4, wherein: The number of flexible members (5) arranged on each side wall of the first cavity (100) and the sub-cavity (120) is at least two, and the at least two flexible members (5) are symmetrically arranged with the height middle line of the square shell battery (3).

6. The battery pack power supply device for electric cells according to claim 1, wherein: Further comprising a cover plate (6), wherein the cover plate (6) is arranged on the opening side of the box (1), the size of the cover plate (6) matches the size of the first cavity (100), and the cover plate (6) is used for packaging the square shell battery (3).

7. The battery pack power supply device for electric cells according to claim 1, wherein: The parallel busbar assembly (4) comprises a plurality of first connecting pieces (41), a plurality of second connecting pieces (42) and a flexible circuit board (43), wherein the plurality of first connecting pieces (41) are respectively magnetically fixed with the positive electrode pieces of each square shell battery (3) and the power supply battery (2), the plurality of second connecting pieces (42) are respectively magnetically fixed with the negative electrode pieces of each square shell battery (3) and the power supply battery (2), the flexible circuit board (43) is arranged in the first cavity (100), and the plurality of first connecting pieces (41) and the plurality of second connecting pieces (42) are electrically connected with the corresponding contacts of the flexible circuit board (43), for parallel connection of the power supply battery (2) and each square shell battery (3).

8. The bulk storage power supply of claim 7, wherein: The positive plate and the negative plate of each party shell battery cell (3) and the supplementary battery cell (2) are provided with a groove (400), the first connecting plate (41) and the second connecting plate (42) are provided with a protruding part (410) away from the flexible circuit board (43), the size of the protruding part (410) matches the size of the groove (400), and the protruding part (410) is abutted in the groove (400), for positioning between the connecting plate and the pole plate.

9. The bulk storage power supply of claim 7, wherein: The flexible circuit board (43) is provided with a connecting circuit, the connecting circuit comprises a first switch (421) and a plurality of second switches (422), wherein the first connecting plate (41) connected with the positive plate of the supplementary battery cell (2) is electrically connected with the first switch (421), the other end of the first switch (421) is electrically connected with one end of each second switch (422), the other end of each second switch (422) is electrically connected with the first connecting plate (41) connected with the positive plate of the corresponding party shell battery cell (3), the second connecting plate (42) connected with the negative plate of the supplementary battery cell (2) is electrically connected with the second connecting plate (42) connected with the negative plate of each party shell battery cell (3), and the control ends of the first switch (421) and the plurality of second switches (422) are electrically connected with the BMS battery system.

10. The bulk storage power supply of claim 9, wherein: The first switch (421) and the second switch (422) are MOS tubes.

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