Battery pack with battery cell pre-tightening structure and standby power supply

Abstract

The utility model provides a battery pack with a battery cell pre-tightening structure and a standby power source, the battery pack with the battery cell pre-tightening structure comprises a battery cell primary module, a battery management system assembly, a bottom plate assembly, an upper cover assembly and a front panel assembly, and the battery cell primary module comprises a plurality of stacked single battery cells; the bottom plate assembly comprises a bottom plate structural member and a bottom plate limiting bracket; the bottom plate limiting bracket is used for limiting the primary battery cell module; the upper cover assembly comprises an upper cover structural member, and buffer foam is laid between the battery cell primary module and the upper cover structural member; the front panel assembly comprises a front panel structural member and a first wiring terminal, and the first wiring terminal is electrically connected with the battery cell primary module; the first wiring terminal and the battery management system assembly are fixedly mounted on the front panel structural member; insulation paper is laid on the bottom plate structural member and the upper cover structural member. According to the invention, the problem of how to maintain the pre-tightening of the battery cells of the battery pack while realizing the miniaturization of the battery pack is solved.

Description

Technical Field

[0001] The present application relates to the field of battery packs, and particularly to a battery pack with a pre-tightening structure for battery cells and a backup power supply. Background Art

[0002] A backup power supply refers to a power supply system that can quickly and automatically switch on and take over from the main power supply to continue power supply when the main power supply of an electrical device fails or for other reasons. Among them, the battery pack is an important part of the backup power supply, and the battery pack has the advantages of small size, light weight, and simple maintenance.

[0003] With the iteration of electrical devices, the hard parameter standards such as the external dimensions of the battery pack are gradually becoming smaller, so the structure of the battery pack also needs to be optimized and upgraded. Therefore, how to maintain the pre-tightening of the battery cells of the battery pack while realizing the miniaturization of the battery pack is an urgent problem to be solved in the present application. Utility Model Content

[0004] The present application provides a battery pack with a pre-tightening structure for battery cells and a backup power supply to solve the problem of how to maintain the pre-tightening of the battery cells of the battery pack while realizing the miniaturization of the battery pack.

[0005] In a first aspect, the present application provides a battery pack with a pre-tightening structure for battery cells, including:

[0006] A first-level battery cell module, a battery management system component, and a bottom plate component, an upper cover component, and a front panel component that wrap the first-level battery cell module; wherein, the first-level battery cell module includes a plurality of stacked single battery cells;

[0007] The bottom plate component includes: a bottom plate structural member, and a bottom plate limiting bracket fixedly installed on the bottom plate structural member; the bottom plate limiting bracket is used to limit the first-level battery cell module;

[0008] The upper cover component includes: an upper cover structural member; the upper cover structural member is fixedly installed on the bottom plate structural member and the bottom plate limiting bracket; a buffer foam is laid between the first-level battery cell module and the upper cover structural member;

[0009] The front panel component includes: a front panel structural member, and a first wiring terminal fixedly installed on the front panel structural member; the front panel structural member is fixedly installed on the bottom plate structural member and the upper cover structural member, and the first wiring terminal is electrically connected to the first-level battery cell module;

[0010] The first wiring terminal is fixedly installed at one end of the front panel structural member, and the battery management system component is fixedly installed at the other end of the front panel structural member;

[0011] Insulating paper is laid on both the bottom plate structural member and the upper cover structural member.

[0012] In a possible design, the cell-level module includes: two cell-secondary modules arranged left and right, and a first connection row;

[0013] The two cell-secondary modules are connected in series through the first connection row and are electrically connected to the first wiring terminal;

[0014] Each cell-secondary module includes: a first preset number of cell-tertiary modules aligned in a single row front and back, a plurality of second connection rows, a first insulating plate, and a second insulating plate;

[0015] Each cell-tertiary module includes: a second preset number of single cells aligned in a single row up and down;

[0016] In each cell-secondary module, a plurality of single cells are connected in series through a plurality of second connection rows; the first insulating plate is used for insulation treatment between the plurality of single cells and the plurality of second connection rows;

[0017] A buffer foam is laid on the first insulating plate, and the second insulating plate is fixedly installed on the first insulating plate through the buffer foam on the first insulating plate; the second insulating plate is used for insulation treatment between the two cell-secondary modules.

[0018] In a possible design, each single cell is a square cell, and the positive electrode post and the negative electrode post of each single cell are coplanar;

[0019] In each cell-secondary module, one electrode post of each single cell is aligned with the other electrode post of the adjacent single cell.

[0020] In a possible design, the second preset number is a positive even number;

[0021] Each cell-secondary module further includes: two third connection rows, a second wiring terminal, and a third wiring terminal;

[0022] In each cell-secondary module, one end of the two third connection rows is fixedly connected to a single cell respectively, and the other end of the two third connection rows is fixedly connected to the second wiring terminal and the third wiring terminal respectively; the two single cells fixedly installed with the third connection rows are located at both ends of the same cell-tertiary module;

[0023] The second wiring terminal is fixedly connected to one end of the first connection row, and the third wiring terminal is electrically connected to the first wiring terminal.

[0024] In a possible design, each cell-secondary module further includes: at least one partition bracket, two upper and lower pressing brackets, and two left and right pressing brackets;

[0025] In each secondary battery cell module, a plurality of tertiary battery cell modules and at least one partition bracket are arranged at intervals, and each partition bracket is used to partition adjacent tertiary battery cell modules;

[0026] Each upper and lower pressing bracket includes: a plurality of upper and lower limiting grooves matching the shape of the tertiary battery cell module;

[0027] Two upper and lower pressing brackets are located on the upper and lower sides of the plurality of tertiary battery cell modules, and each partition bracket, second wiring terminal and third wiring terminal are fixedly installed on the two upper and lower pressing brackets;

[0028] Two left and right pressing brackets are located on the left and right sides of the plurality of tertiary battery cell modules, and the second insulating plate and the two upper and lower pressing brackets are fixedly installed on the two left and right pressing brackets.

[0029] In a possible design, each tertiary battery cell module further includes: a thermal conductive silicone film sleeved on the outer surfaces of a second preset number of single battery cells, and a buffer silicone sheet laid between adjacent single battery cells;

[0030] An insulating paper is further laid on the outer surface of the thermal conductive silicone film.

[0031] In a possible design, fixing points are provided on the first connection row, each second connection row, each third connection row and the first wiring terminal;

[0032] The battery management system component is respectively connected to each fixing point through an information collection line.

[0033] In a possible design, the first wiring terminal includes: two positive wiring terminals, two negative wiring terminals and a grounding protection bolt;

[0034] Both of the two positive wiring terminals are electrically connected to a third wiring terminal, and both of the two negative wiring terminals are electrically connected to another third wiring terminal.

[0035] In a possible design, the front panel assembly further includes: two symmetrically arranged handles fixedly installed on the front panel structural member.

[0036] In a second aspect, the present application provides a backup power supply, including: a power control device, and a battery pack with a battery cell pre-tightening structure as in the first aspect, which is electrically connected to the power control device;

[0037] When the power supply of the electrical equipment is cut off, the power control device is used to control the battery pack with a battery cell pre-tightening structure to supply power to the electrical equipment.

[0038] A battery pack and a backup power supply with a cell pre-tightening structure provided by the present application. The battery pack with the cell pre-tightening structure includes: a first-level cell module, a battery management system component, a bottom plate component, an upper cover component, and a front panel component. The first-level cell module includes a plurality of stacked single cells; the bottom plate component includes a bottom plate structural member and a bottom plate limiting bracket, and the bottom plate limiting bracket is used to limit the first-level cell module; the upper cover component includes an upper cover structural member, and a buffer foam is laid between the first-level cell module and the upper cover structural member; the front panel component includes a front panel structural member and a first wiring terminal, and the first wiring terminal is electrically connected to the first-level cell module; the first wiring terminal and the battery management system component are fixedly installed on the front panel structural member; insulating papers are laid on both the bottom plate structural member and the upper cover structural member. The following technical effects are achieved: Through the bottom plate structural member, the bottom plate limiting bracket, and the upper cover structural member, the support for the first-level cell module is jointly ensured, the pre-tightening of the single cells is enhanced, and the problem of how to maintain the pre-tightening of the cells in the battery pack while realizing the miniaturization of the battery pack is solved; through the buffer foam between the main body structures of the first-level cell module and the upper cover structural member, the displacement of the first-level cell module relative to the upper cover structural member is avoided, and the impact of external forces on the first-level cell module is slowed down; through the insulating papers laid on the bottom plate structural member and the upper cover structural member, the functions of insulation and short-circuit prevention are achieved, and the safety and stability of the battery pack with the cell pre-tightening structure are improved, which helps the battery pack with the cell pre-tightening structure to adapt to complex working environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 It is a schematic diagram of the scenario of the battery pack with the cell pre-tightening structure provided by the embodiment of the present application;

[0041] Figure 2 It is an exploded view of the battery pack with the cell pre-tightening structure provided by the embodiment of the present application;

[0042] Figure 3 It is a schematic diagram of the structure of the bottom plate component provided by the embodiment of the present application;

[0043] Figure 4 It is a schematic diagram of the structure of the upper cover component provided by the embodiment of the present application;

[0044] Figure 5 It is a schematic diagram of the structure of the front panel component provided by the embodiment of the present application Figure 1 ;

[0045] Figure 6 Explosion schematic diagram of the first-level module of the battery cell provided by the embodiment of the present application;

[0046] Figure 7 Explosion schematic diagram of the second-level module of the battery cell provided by the embodiment of the present application;

[0047] Figure 8 Structural schematic diagram of the single battery cell provided by the embodiment of the present application;

[0048] Figure 9 Series connection schematic diagram of the single battery cells in the third-level module of the battery cell provided by the embodiment of the present application;

[0049] Figure 10 Explosion schematic diagram of the third-level module of the battery cell provided by the embodiment of the present application;

[0050] Figure 11 Connection schematic diagram of the information acquisition line provided by the embodiment of the present application;

[0051] Figure 12 Structural schematic of the front panel assembly provided by the embodiment of the present application Figure 2 。

[0052] Reference numerals:

[0053] 10 - Electrical equipment; 20 - Main power supply; 30 - Backup power supply; 31 - Power control device; 32 - Battery pack with battery cell pre-tightening structure

[0054] 100 - First-level module of battery cell; 110 - Second-level module of battery cell; 111 - Third-level module of battery cell; 1111 - Single battery cell; 1112 - Thermal conductive silicone film; 1113 - Buffer silicone sheet; 112 - Second connection row; 113 - First insulating board; 114 - Second insulating board; 115 - Third connection row; 1161 - Second wiring terminal; 1162 - Third wiring terminal; 117 - Partition bracket; 118 - Upper and lower pressing brackets; 1181 - Upper and lower limiting grooves; 119 - Left and right pressing brackets; 120 - First connection row

[0055] 200 - Battery management system assembly;

[0056] 310 - Bottom plate assembly; 311 - Bottom plate structural member; 312 - Bottom plate limiting bracket; 320 - Upper cover assembly; 321 - Upper cover structural member; 330 - Front panel assembly; 331 - Front panel structural member; 332 - First wiring terminal; 3321 - Positive wiring terminal; 3322 - Negative wiring terminal; 3323 - Ground protection bolt; 333 - Handle

[0057] 410 - Buffer foam; 420 - Insulating paper; 430 - Fixing point; 440 - Information acquisition line

[0058] 510 - positive electrode terminal; 520 - negative electrode terminal; 530 - electrolyte injection port; 540 - pressure relief valve; 550 - housing. Detailed implementation manners

[0059] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all the implementation manners consistent with the present application. On the contrary, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0060] In the embodiments of the present application, words such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and effects. Those skilled in the art can understand that the words such as "first" and "second" do not limit the quantity and execution order, and the words such as "first" and "second" do not necessarily limit to be different. It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the present application should not be interpreted as being more preferred or having more advantages than other embodiments or design solutions. Exactly speaking, using words such as "exemplary" or "for example" aims to present relevant concepts in a specific way. In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more.

[0061] It should be noted that "when... " in the embodiments of the present application can be at the instant when a certain situation occurs, or within a period of time after a certain situation occurs. The embodiments of the present application do not make specific limitations on this. In addition, a battery pack with a cell pre-tightening structure provided in the embodiments of the present application is only an example, and the battery pack with a cell pre-tightening structure may also include more or less content.

[0062] To clearly understand the technical solution of the present application, the solutions of the prior art will be introduced in detail first. A backup power supply refers to a power supply system that can quickly and automatically switch on and take over the main power supply to continue power supply when the main power supply of an electrical device stops power supply due to a fault or other reasons. Among them, a battery pack is an important part of the backup power supply, and the battery pack has the advantages of small volume, light weight and simple maintenance.

[0063] During the use of the battery pack, it needs to be fixed at a certain place of the electrical device so that the battery pack can supply emergency power to the electrical device in time. With the iteration of the electrical device, the rigid parameter standards such as its own external dimensions are gradually tending to be miniaturized or simplified. Therefore, the standard for the battery pack is also gradually tending to be miniaturized, so the structure of the battery pack also needs to be optimized and upgraded.

[0064] However, the miniaturization of the battery pack means that the internal space is more compact, which requires the pre-tightening force design between the battery cells to be more precise and efficient. If the pre-tightening of the battery cells is too small, it may not effectively prevent the displacement and loosening between the battery cells, which will not only reduce the overall structural stability of the battery pack, but also may cause poor contact between the battery cells, thereby increasing the internal resistance and reducing the battery efficiency; if the pre-tightening of the battery cells is too large, it may cause the deformation or even damage of the battery pack structure. At the same time, it will also lead to an increase in the internal resistance of the battery pack and a gradual decrease in the capacity.

[0065] In summary, how to maintain the pre-tightening of the battery cells of the battery pack while achieving the miniaturization of the battery pack is an urgent problem to be solved in this application.

[0066] Therefore, in view of the above technical problems existing in the prior art, the embodiments of this application provide a battery pack and a backup power supply with a battery cell pre-tightening structure, which can be used in the technical field of battery packs, aiming to provide a battery pack with sufficient pre-tightening of battery cells to stably exert its performance.

[0067] Next, the application scenarios of the battery pack with a battery cell pre-tightening structure provided by the embodiments of this application will be introduced. Figure 1 This is a schematic diagram of the scenario of the battery pack with a battery cell pre-tightening structure provided by the embodiments of this application. It should be noted that Figure 1 The example shown is only an example of the scenario to which the embodiments of this application can be applied, to help those skilled in the art understand the technical content of this application, but it does not mean that the embodiments of this application cannot be used in other devices, systems, environments or scenarios.

[0068] As Figure 1 shown, an application scenario of a battery pack with a battery cell pre-tightening structure is shown, including: an electrical device 10, a main power supply 20, and a backup power supply 30.

[0069] The electrical device 10 can be a base station device, a storage device, or a transmission device in the communication field, etc., or a driving device, a control device, or a production line device in the industrial field, etc., or a signal indication device, a lighting device, or a passenger elevator device in the public field, etc., or other devices not listed. For example, when the electrical device 10 is a base station device, the electrical device 10 is used to establish two-way communication with surrounding terminal devices through radio waves to ensure that the terminal devices can stably access the network and perform wireless transmission; among them, the terminal devices can be smartphones, in-vehicle infotainment systems (IVI), or customer premises equipment (CPE), etc.

[0070] The main power supply 20 is electrically connected to the electrical equipment 10. The power supply provided by the main power supply 20 is connected to the electrical equipment 10 via a transformer and a power distribution system, and is used to continuously provide a stable power supply to the electrical equipment 10. The main power supply 20 can be a mains power grid, or a power generation device such as a gasoline generator or a diesel generator, or an auxiliary power generation device such as solar energy, wind energy or a ground source heat pump.

[0071] The backup power supply 30 is electrically connected to the electrical equipment 10. The power supply provided by the backup power supply 30 is connected to the electrical equipment 10 via a transformer and a power distribution system, and is used to provide an emergency power supply to the electrical equipment 10 when the main power supply 20 is interrupted or fails. The backup power supply 30 can be set on the electrical equipment 10, or can be set at a certain distance around the electrical equipment 10 to ensure that the electrical equipment 10 is powered in a timely manner.

[0072] The backup power supply 30 includes: a power control device 31, and a battery pack 32 with a cell pre-tightening structure electrically connected to the power control device 31; the power control device 31 can actively detect whether the main power supply 20 is interrupted or fails, or can deduce whether the main power supply 20 is interrupted or fails through the parameters or messages of the electrical equipment 10; when the main power supply 20 is interrupted or fails and causes the electrical equipment 10 to lose power, the power control device 31 is used to control the battery pack 32 with a cell pre-tightening structure to supply power to the electrical equipment 10; when the main power supply 20 resumes power supply to the electrical equipment 10, the power control device 31 is also used to charge the battery pack 32 with a cell pre-tightening structure through the main power supply 20.

[0073] Furthermore, the electrical equipment 10 includes an Uninterruptible Power Supply System (UPS). The main power supply 20 can also deduce whether the main power supply 20 is interrupted or fails when the UPS supplies power to the electrical equipment 10.

[0074] The embodiments of the present application will be introduced below in conjunction with the accompanying drawings of the specification.

[0075] Figure 2 It is an exploded view of the battery pack with a cell pre-tightening structure provided by the embodiment of the present application. As Figure 2 shown, the structural composition of the battery pack with a cell pre-tightening structure is shown. The embodiment of the present application provides a battery pack with a cell pre-tightening structure, including:

[0076] A first-level cell module 100, a battery management system component 200, and a bottom plate component 310, an upper cover component 320 and a front panel component 330 that wrap the first-level cell module 100; wherein, the first-level cell module 100 includes a plurality of stacked single cells 1111.

[0077] Specifically, first define the direction of the battery pack with the pre-tightening structure for the battery cells. Taking the first-level module 100 of the battery cells as a reference, the bottom plate assembly 310 is located below the first-level module 100 of the battery cells, the upper cover assembly 320 is located above the first-level module 100 of the battery cells, and the front panel assembly 330 is located in front of the first-level module 100 of the battery cells. The bottom plate assembly 310, the upper cover assembly 320, and the front panel assembly 330 form the outer shell of the first-level module 100 of the battery cells, which are jointly used to protect the first-level module 100 of the battery cells and provide structural support for the first-level module 100 of the battery cells.

[0078] The stacking method of the single battery cells 1111 can be single-string battery stacking, parallel battery stacking, or series-parallel battery stacking. By different stacking methods, parameters such as the energy density, output voltage, and capacity of the first-level module 100 of the battery cells are improved. Moreover, the shape of the outer shell fits the shape of the first-level module 100 of the battery cells as much as possible to enhance its support for the first-level module 100 of the battery cells.

[0079] The stacking quantity of the single battery cells 1111 can be that different stacking quantities correspond to different models, and then select the model with a matching output voltage from multiple models according to the working voltage of the electrical equipment; it can also be that the stacking quantity is determined in advance according to the working voltage of the electrical equipment. For example, when the output voltage of a single battery cell 1111 is 3.2V, the stacking method is single-string battery stacking, and the working voltage of the base station equipment is 48V, the stacking quantity of the single battery cells 1111 is 16.

[0080] The bottom plate assembly 310 includes: a bottom plate structural member 311, and a bottom plate limiting bracket 312 fixedly installed on the bottom plate structural member 311; the bottom plate limiting bracket 312 is used to limit the first-level module 100 of the battery cells.

[0081] Specifically, the bottom plate limiting bracket 312 is fixedly installed on the bottom plate structural member 311. The fixed installation method can be the bolt fixation shown in the figure, or other fixed methods such as welding, riveting, snap connection, or gluing, etc.; the fixed installation position can be determined according to the shape of the first-level module 100 of the battery cells so that the shape enclosed by the bottom plate limiting bracket 312 fits the shape of the first-level module 100 of the battery cells as much as possible. The bottom plate structural member 311 is used to limit the lower part of the first-level module 100 of the battery cells, and the bottom plate limiting bracket 312 is used to limit the front and rear parts of the first-level module 100 of the battery cells.

[0082] The upper cover assembly 320 includes: an upper cover structural member 321; the upper cover structural member 321 is fixedly installed on the bottom plate structural member 311 and the bottom plate limiting bracket 312; a buffer foam 410 is laid between the first-level module 100 of the battery cells and the upper cover structural member 321.

[0083] Specifically, the upper cover structural member 321 is fixedly installed on the bottom plate assembly 310, and the fixed installation method is the same as that of the bottom plate limit bracket 312 fixedly installed on the bottom plate structural member 311.

[0084] Figure 3 It is a schematic structural diagram of the bottom plate assembly provided by the embodiment of the present application. Figure 4 It is a schematic structural diagram of the upper cover assembly provided by the embodiment of the present application. As Figures 2 to 4 shown, both the bottom plate structural member 311 and the upper cover structural member 321 are sheet metal structural members, both including a main structure and bends located on the left and right sides and the rear of the first-level battery cell module 100; then the left and right side bends of the upper cover structural member 321 are fixedly installed on the bottom plate structural member 311 and the bottom plate limit bracket 312, the rear bend of the upper cover structural member 321 is fixedly installed on the rear bend of the bottom plate structural member 311, and the first-level battery cell module 100 is fixedly installed on the left and right side bends of the bottom plate structural member 311 and the bottom plate limit bracket 312. Among them, the main structure of the bottom plate structural member 311 is used to limit the lower part of the first-level battery cell module 100; the main structure of the upper cover structural member 321 is used to limit the upper part of the first-level battery cell module 100; the left and right side bends of the bottom plate structural member 311 and the upper cover structural member 321 are jointly used to limit the left and right sides of the first-level battery cell module 100; the bottom plate structural member 311, the bottom plate limit bracket 312 and the upper cover structural member 321 jointly ensure the support for the first-level battery cell module 100, thereby enhancing the pre-tightening of the single battery cell 1111.

[0085] A buffer foam 410 is laid between the first-level battery cell module 100 and the main structure of the upper cover structural member 321. The buffer foam 410 is used to prevent the displacement of the first-level battery cell module 100 relative to the upper cover structural member 321 and slow down the impact of external force on the first-level battery cell module 100. The laying method can be a paste laying method, a direct laying method, an embedding laying method or a combined laying method, etc.; among them, the paste laying method refers to using an adhesive to paste the buffer foam 410 on the first-level battery cell module 100; the direct laying method refers to directly placing the buffer foam 410 on the first-level battery cell module 100; the embedding laying method refers to embedding the buffer foam 410 into a preset groove of the first-level battery cell module 100 and then fixing it by means of screws or buckles, etc.; the combined laying method refers to combining buffer foams 410 with different materials, shapes or thicknesses for laying.

[0086] The front panel assembly 330 includes: a front panel structural member 331, and a first wiring terminal 332 fixedly installed on the front panel structural member 331; the front panel structural member 331 is fixedly installed on the bottom plate structural member 311 and the upper cover structural member 321, and the first wiring terminal 332 is electrically connected to the first-level battery cell module 100.

[0087] Specifically, the front panel structural member 331 is fixedly installed on the bottom plate structural member 311 and the upper cover structural member 321, and the first terminal 332 is fixedly installed on the front panel structural member 331, and the fixed installation method is the same as that of the bottom plate limit bracket 312 fixedly installed on the bottom plate structural member 311.

[0088] Figure 5 Schematic structure of the front panel assembly provided by the embodiment of the present application Figure 1 As Figure 5 shown, the front panel structural member 331 is a sheet metal structural member, including a main structure, and bends located on the left and right sides and above and below the first-level battery cell module 100; the left and right side bends of the front panel structural member 331 are fixedly installed on the left and right side bends of the upper cover structural member 321, the upper bend of the front panel structural member 331 is fixedly installed on the main structure of the upper cover structural member 321, and the lower bend of the front panel structural member 331 is fixedly installed on the main structure of the bottom plate structural member 311.

[0089] A first through hole is formed in the front panel structural member 331, and the shape of the first through hole can match the shape of the connecting member for electrical connection. The first terminal 332 is fixedly installed on one side of the first through hole, and the first terminal 332 is electrically connected to the first-level battery cell module 100 through the connecting member passing through the first through hole; the shape of the first through hole can also match the shape of the first terminal 332, and the first terminal 332 passes through the first through hole and is electrically connected to the first-level battery cell module 100 through the connecting member.

[0090] The first terminal 332 is fixedly installed at one end of the front panel structural member 331, and the battery management system assembly 200 is fixedly installed at the other end of the front panel structural member 331.

[0091] Specifically, the battery management system assembly 200 includes a plurality of input / output interfaces, and a plurality of second through holes are formed in the front panel structural member 331, and the shapes of these second through holes match the shapes of the plurality of input / output interfaces of the battery management system assembly 200. The battery management system assembly 200 is located between the front panel structural member 331 and the first-level battery cell module 100, and the plurality of input / output interfaces of the battery management system assembly 200 pass through these second through holes and / or are located on one side of these first through holes.

[0092] To achieve clear function differentiation and improve safety, the first terminal 332 and the battery management system assembly 200 are arranged at both ends of the front panel structural member 331, and the first through hole and the second through hole are arranged at both ends of the front panel structural member 331.

[0093] Insulating paper 420 is laid on both the bottom plate structural member 311 and the upper cover structural member 321.

[0094] Specifically, insulating paper 420 provides insulation and short-circuit protection, improving the safety and stability of the pre-tensioned battery pack while also helping it adapt to complex operating environments. Insulating paper 420 can be made of polypropylene, highland barley paper, Nomex, or a composite insulating paper. For the upper cover structure 321, insulating paper 420 can be placed between the cushioning foam 410 and the upper cover structure 321.

[0095] In combination with the above embodiments, it can be seen that the installation order of the battery pack with a cell pre-tightening structure can be:

[0096] First, lay insulating paper 420 on the bottom plate structure 311 and the upper cover structure 321, and lay buffer foam 410 on the upper surface of the battery cell first-level module 100;

[0097] Next, the primary cell module 100 is fixedly mounted on the bottom plate structure 311 ;

[0098] Next, the upper cover structure 321 is fixedly mounted on the bottom plate structure 311 and the bottom plate limiting bracket 312;

[0099] Next, electrically connect the first terminal 332 to the primary battery module 100 , and securely mount the first terminal 332 and the battery management system assembly 200 on the front panel structure 331 .

[0100] Finally, the front panel structure 331 is fixedly installed on the bottom plate structure 311 and the upper cover structure 321 .

[0101] A battery pack with a pre-tightening structure for battery cells provided by an embodiment of the present application includes: a first-level battery cell module, a battery management system component, a bottom plate component, an upper cover component, and a front panel component. The first-level battery cell module includes a plurality of stacked single battery cells; the bottom plate component includes a bottom plate structural member and a bottom plate limiting bracket, and the bottom plate limiting bracket is used to limit the first-level battery cell module; the upper cover component includes an upper cover structural member, and a buffer foam is laid between the first-level battery cell module and the upper cover structural member; the front panel component includes a front panel structural member and a first wiring terminal, and the first wiring terminal is electrically connected to the first-level battery cell module; the first wiring terminal and the battery management system component are fixedly installed on the front panel structural member; insulating paper is laid on both the bottom plate structural member and the upper cover structural member. The following technical effects are achieved: through the bottom plate structural member, the bottom plate limiting bracket, and the upper cover structural member, the support for the first-level battery cell module is jointly ensured, the pre-tightening of the single battery cells is enhanced, and the problem of how to maintain the pre-tightening of the battery cells in the battery pack while realizing the miniaturization of the battery pack is solved; through the buffer foam between the main body structures of the first-level battery cell module and the upper cover structural member, the displacement of the first-level battery cell module relative to the upper cover structural member is avoided, and the impact of external force on the first-level battery cell module is slowed down; through the insulating paper laid on the bottom plate structural member and the upper cover structural member, the functions of insulation and short-circuit prevention are achieved, and the safety and stability of the battery pack with the pre-tightening structure for battery cells are improved, which helps the battery pack with the pre-tightening structure for battery cells to adapt to complex working environments.

[0102] Figure 6 It is an exploded schematic diagram of the first-level battery cell module provided by an embodiment of the present application. Figure 7 It is an exploded schematic diagram of the second-level battery cell module provided by an embodiment of the present application. As Figures 2 to 6 shown, the structural composition of the first-level battery cell module is shown. The first-level battery cell module 100 includes: two second-level battery cell modules 110 arranged left and right, and a first connection row 120;

[0103] The two second-level battery cell modules 110 are connected in series through the first connection row 120 and are electrically connected to the first wiring terminal 332.

[0104] Specifically, each of the two second-level battery cell modules 110 includes a plurality of stacked single battery cells 1111. The stacking methods and stacking quantities of the two second-level battery cell modules 110 and the first-level battery cell module 100 can be exactly the same, exactly different, or one can be the same while the other is different.

[0105] Each of the two secondary battery cell modules 110 includes a positive electrode and a negative electrode (the positive and negative electrodes are the connection terminals on the secondary battery cell module 110). The positive electrode of the previous secondary battery cell module 110 (any one of the two secondary battery cell modules 110) is electrically connected to the negative electrode of the subsequent secondary battery cell module 110 through the first connection row 120, realizing the series connection of the two secondary battery cell modules 110. Correspondingly, the negative electrode of the previous secondary battery cell module 110 is electrically connected to the positive electrode of the first connection terminal 332, and the positive electrode of the subsequent secondary battery cell module 110 is electrically connected to the negative electrode of the first connection terminal 332, realizing the electrical connection between the secondary battery cell module 110 and the first connection terminal 332. It should be noted that the positions of the positive and negative electrodes of each of the two secondary battery cell modules 110, as well as the positional relationship between the two secondary battery cell modules 110, can be in the style as shown in Figure 6 or in other styles not drawn. This embodiment does not make any limitations.

[0106] As shown in Figure 7 , the structural composition of the secondary battery cell module 110 located on the left is shown (the structural composition of the primary battery cell module 110 located on the right is similar and will not be elaborated in this embodiment). Taking this secondary battery cell module as an example, each secondary battery cell module 110 includes: a first preset number of tertiary battery cell modules 111 aligned in a single row front and back, a plurality of second connection rows 112, a first insulating plate 113, and a second insulating plate 114;

[0107] Each tertiary battery cell module 111 includes: a second preset number of single battery cells 1111 aligned in a single row up and down.

[0108] Specifically, the first preset number and the second preset number are determined according to the stacking number of the tertiary battery cell modules 111. For example, when the stacking number of the secondary battery cell modules 110 is 16, and the stacking number of the tertiary battery cell modules 111 is 8, the first preset number can be 2, and the second preset number can be 4; or the first preset number can be 4, and the second preset number can be 2.

[0109] The first preset number of tertiary battery cell modules 111 are aligned in a single column front and back, and the second preset number of single battery cells 1111 are aligned in a single column up and down. The effect is to make the most effective use of the battery pack space as much as possible and improve the energy storage capacity of the battery pack; at the same time, it can also prevent short circuits caused by poor contact or uneven spacing between the battery cells.

[0110] In each secondary battery cell module 110, a plurality of single battery cells 1111 are connected in series through a plurality of second connection rows 112; the first insulating plate 113 is used for insulation treatment between the plurality of single battery cells 1111 and the plurality of second connection rows 112;

[0111] A buffer foam 410 is laid on the first insulating plate 113, and the second insulating plate 114 is fixedly installed on the first insulating plate 113 through the buffer foam 410 on the first insulating plate 113; the second insulating plate 114 is used for insulating treatment between two cell secondary modules 110.

[0112] Specifically, multiple single cells 1111 can be connected in series. It can be that the single cells 1111 in the same row are connected in series first, and then multiple rows are connected in series; or the single cells 1111 in the same column are connected in series first, and then multiple columns are connected in series; or there can be other series connection methods not listed; among them, the single cells 1111 in the same row refer to multiple single cells 1111 located at the same position in different cell tertiary modules 111, and the single cells 1111 in the same column refer to multiple single cells 1111 located in the same cell tertiary module 111.

[0113] A first insulating plate 113 is fixedly installed at the electrode of the cell tertiary module 111, a buffer foam 410 is fixedly installed on the first insulating plate 113, and a second insulating plate 114 is fixedly installed on the buffer foam 410. To ensure safety, these fixed installation forms are all adhesive. The buffer foam 410 here is similar to the buffer foam 410 in the above embodiment, and will not be elaborated in this embodiment. Among them, the first insulating plate 113 and the second insulating plate 114 can be insulating epoxy resin plates, fiberglass plates or electrical laminated wood boards, etc.

[0114] The technical effect of this embodiment is that multiple single cells are stacked into a cell tertiary module, multiple cell tertiary modules are combined into a cell secondary module, and then two cell secondary modules are combined into a cell first module, realizing the neat stacking of multiple single cells.

[0115] Figure 8 It is a schematic structural diagram of a single cell provided by an embodiment of the present application. Figure 9 It is a schematic diagram of the series connection of single cells in a cell tertiary module provided by an embodiment of the present application. In one possible design, as Figure 8 shown, each single cell 1111 is a square cell, and the positive electrode terminal and the negative electrode terminal of each single cell 1111 are coplanar.

[0116] Specifically, the single cell 1111 is a square cell to ensure neat stacking and further improve the space utilization of the battery pack. The single cell 1111 includes: a positive electrode terminal 510, a negative electrode terminal 520, an electrolyte injection port 530, a pressure relief valve 540, and a housing 550. One end of a second connection row 112 is fixedly installed on the terminal of the single cell 1111. To ensure stability, these fixed installation forms are all welding.

[0117] As Figure 9As shown, in each secondary battery cell module 110, one pole terminal of each single battery cell 1111 is aligned with the other pole terminal of an adjacent single battery cell 1111.

[0118] Specifically, in the tertiary battery cell module 111, multiple single battery cells 1111 are stacked regularly with staggered alignment, that is, the positive pole terminals and negative pole terminals of adjacent single battery cells 1111 are staggered and aligned with each other. In the secondary battery cell module 110, the placement directions of multiple tertiary battery cell modules 111 are kept consistent, that is, among two single battery cells 1111 at the same position in adjacent secondary battery cell modules 110, one pole terminal (either the positive pole terminal or the negative pole terminal) of one single battery cell 1111 is aligned with the other pole terminal of the other single battery cell 1111. The second connection row 112 first connects the single battery cells 1111 in the same row in series and then connects multiple rows in series.

[0119] The technical effect of this embodiment is that multiple square single battery cells are staggered and aligned and stacked into a tertiary battery cell module, and then the placement directions of multiple tertiary battery cell modules are kept consistent and combined into a secondary battery cell module, realizing the series connection of multiple single battery cells in the secondary battery cell module.

[0120] In a possible design, as Figures 2 to 7 shown, the second preset quantity is a positive even number;

[0121] Each secondary battery cell module 110 further includes: two third connection rows 115, a second wiring terminal 1161, and a third wiring terminal 1162;

[0122] In each secondary battery cell module 110, one end of each of the two third connection rows 115 is fixedly connected to a single battery cell 1111 respectively, and the other ends of the two third connection rows 115 are fixedly connected to the second wiring terminal 1161 and the third wiring terminal 1162 respectively; the two single battery cells 1111 fixedly installed with the third connection rows 115 are located at both ends of the same tertiary battery cell module 111;

[0123] The second wiring terminal 1161 is fixedly connected to one end of the first connection row 120, and the third wiring terminal 1162 is electrically connected to the first wiring terminal 332.

[0124] Specifically, when the second preset quantity is a positive even number, this series connection method can ensure that the four third connection rows 115 are located on the same side, so that the second wiring terminal 1161, the third wiring terminal 1162, and the first connection row 120 are located on the same side, further improving the space utilization of the battery pack.

[0125] Two secondary battery cell modules 110 adopt Figure 6Placed in the lying - face - to - face manner as shown, that is, the positive and negative electrode posts of the two cell secondary modules 110 are staggered and aligned. One end of a third connection row 115 is fixedly connected to the positive electrode post of a single cell 1111, and one end of another third connection row 115 is fixedly connected to the negative electrode post of another single cell 1111. These connection methods are all welding; the other ends of the two third connection rows 115 are respectively fixedly connected to the second terminal 1161 and the third terminal 1162. This fixed connection method, as well as the fixed connection method between the first connection row 120 and the second terminal 1161, can be welding, bolt fixing, or crimping fixing, etc.; the electrical connection method between the first terminal 332 and the third terminal 1162 can be wire connection, connection row connection, or welding, etc.

[0126] The technical effect of this embodiment is that the two cell secondary modules are placed in the lying - face - to - face manner to form a cell primary module, and an overall electrical circuit is formed through multiple connection rows.

[0127] In a possible design, as Figures 2 to 7 shown, each cell secondary module 110 further includes: at least one partition bracket 117, two upper - and - lower pressing brackets 118, and two left - and - right pressing brackets 119;

[0128] In each cell secondary module 110, multiple cell tertiary modules 111 and at least one partition bracket 117 are arranged at intervals, and each partition bracket 117 is used to separate adjacent cell tertiary modules 111;

[0129] Each upper - and - lower pressing bracket 118 includes: multiple upper - and - lower limiting slots 1181 that match the shape of the cell tertiary module 111;

[0130] The two upper - and - lower pressing brackets 118 are located on the upper and lower sides of the multiple cell tertiary modules 111. Each partition bracket 117, the second terminal 1161, and the third terminal 1162 are all fixedly installed on the two upper - and - lower pressing brackets 118;

[0131] The two left - and - right pressing brackets 119 are located on the left and right sides of the multiple cell tertiary modules 111. The second insulating plate 114 and the two upper - and - lower pressing brackets 118 are all fixedly installed on the two left - and - right pressing brackets 119.

[0132] Specifically, two upper and lower pressing brackets 118 are fixedly installed on two left and right pressing brackets 119. The two upper and lower pressing brackets 118 are jointly used to limit a plurality of cell three - level modules 111 through a plurality of upper and lower limiting grooves 1181, specifically to limit the upper and lower sides of the plurality of cell three - level modules 111. The two left and right pressing brackets 119 are jointly used to limit a plurality of cell three - level modules 111 through at least one partition bracket 117, specifically to limit the left and right sides of the plurality of cell three - level modules 111. It can be understood that the front and rear limits of the plurality of cell three - level modules 111 are achieved through the second connection row 112 and the first insulating plate 113.

[0133] The fixed installation methods between the partition bracket 117, the upper and lower pressing brackets 118 and the left and right pressing brackets 119, the fixed installation methods of the second terminal 1161 and the third terminal 1162 on the upper and lower pressing brackets 118, and the fixed installation method of the second insulating plate 114 on the left and right pressing brackets 119 are similar to those in the above - mentioned embodiment, and will not be elaborated in this embodiment.

[0134] The technical effect of this embodiment is that through the partition bracket, the upper and lower pressing brackets and the left and right pressing brackets, the support for the cell two - level module is jointly ensured, and the pre - tightening of the single cells is further enhanced.

[0135] Furthermore, if the above - mentioned fixed installation methods are all bolt - fixed, then according to the actual pre - tightening force parameters, the distance between the two upper and lower pressing brackets 118 and the distance between the two left and right pressing brackets 119 are adjusted to achieve the effect of pre - tightening force adjustment.

[0136] Figure 10 This is an exploded view of the cell three - level module provided by the embodiment of the present application. In a possible design, as Figure 10 shown, each cell three - level module 111 further includes: a thermal conductive silica gel film 1112 sleeved on the outer surface of the second preset number of single cells 1111, and a buffer silica gel sheet 1113 laid between adjacent single cells 1111;

[0137] An insulating paper 420 is also laid on the outer surface of the thermal conductive silica gel film 1112.

[0138] Specifically, in each cell three - level module 111, the surface of the single cells 1111 stacked in a single row is first covered with the thermal conductive silica gel film 1112 to achieve the function of cell heat dissipation; then covered with the insulating paper 420 to achieve the functions of insulation and short - circuit prevention. At the same time, a buffer silica gel sheet 1113 is laid between two adjacent single cells 1111 to achieve the functions of insulation and buffering.

[0139] Figure 11Schematic diagram of the connection of the information acquisition line provided by the embodiment of the present application. In a possible design, as Figure 11 shown, fixing points 430 are provided on the first connection row 120, each second connection row 112, each third connection row 115, and the first wiring terminal 332;

[0140] The battery management system component 200 is connected to each fixing point 430 through the information acquisition line 440.

[0141] Specifically, the information acquisition line 440 is connected to each fixing point 430 and finally accesses the battery management system component 200, so as to achieve the purpose of the battery management system component 200 collecting the parameters of all single cells 1111 and the circuit.

[0142] Figure 12 Schematic structure of the front panel component provided by the embodiment of the present application Figure 2 . In a possible design, as Figures 7 to 12 shown, the first wiring terminal 332 includes: two positive wiring terminals 3321, two negative wiring terminals 3322, and a ground protection bolt 3323;

[0143] Both of the two positive wiring terminals 3321 are electrically connected to a third wiring terminal 1162, and both of the two negative wiring terminals 3322 are electrically connected to another third wiring terminal 1162.

[0144] Specifically, by setting two positive wiring terminals 3321 and negative wiring terminals 3322, the redundancy of the battery pack 32 of the cell pre-tightening structure can be increased. Even if one wiring terminal fails or is disconnected, the other wiring terminal can still work normally, thus ensuring the continuity and stability of the battery pack 32 of the cell pre-tightening structure. At the same time, parallel power supply is also achieved, thereby increasing the current supply.

[0145] In a possible design, as Figure 12 shown, the front panel component 330 further includes: two symmetrically arranged handles 333 fixedly installed on the front panel structural member 331.

[0146] The embodiment of the present application further provides a backup power supply, including: a power control device, and a battery pack of the cell pre-tightening structure as described in the above embodiment, which is electrically connected to the power control device;

[0147] When the power supply of the electrical equipment is cut off, the power control device is used to control the battery pack of the cell pre-tightening structure to supply power to the electrical equipment.

[0148] The implementation principle and technical effect of the backup power supply provided by the embodiment of the present application are similar to those of a battery pack of a cell pre-tightening structure in the above application embodiment, and will not be elaborated here in the embodiment of the present application.

[0149] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application.

Claims

1. A battery pack with a pre-tightening structure for battery cells, characterized in that, Comprising: a first-level cell module (100), a battery management system component (200), and a bottom plate component (310), an upper cover component (320), and a front panel component (330) that wrap the first-level cell module (100); wherein, the first-level cell module (100) includes a plurality of single cells (1111) stacked; the bottom plate component (310) includes: a bottom plate structural member (311), and a bottom plate limiting bracket (312) fixedly installed on the bottom plate structural member (311); the bottom plate limiting bracket (312) is used to limit the first-level cell module (100); the upper cover component (320) includes: an upper cover structural member (321); the upper cover structural member (321) is fixedly installed on the bottom plate structural member (311) and the bottom plate limiting bracket (312); a buffer foam (410) is laid between the first-level cell module (100) and the upper cover structural member (321); the front panel component (330) includes: a front panel structural member (331), and a first wiring terminal (332) fixedly installed on the front panel structural member (331); the front panel structural member (331) is fixedly installed on the bottom plate structural member (311) and the upper cover structural member (321), and the first wiring terminal (332) is electrically connected to the first-level cell module (100); the first wiring terminal (332) is fixedly installed at one end of the front panel structural member (331), and the battery management system component (200) is fixedly installed at the other end of the front panel structural member (331); insulating paper (420) is laid on both the bottom plate structural member (311) and the upper cover structural member (321).

2. The battery pack with a pre-tightening structure for an electric cell according to claim 1, wherein The first-level cell module (100) includes: two second-level cell modules (110) arranged left and right, and a first connection row (120); the two second-level cell modules (110) are connected in series through the first connection row (120) and are electrically connected to the first wiring terminal (332); each of the second-level cell modules (110) includes: a first preset number of third-level cell modules (111) aligned in a single row front and back, a plurality of second connection rows (112), a first insulating plate (113), and a second insulating plate (114); each of the third-level cell modules (111) includes: a second preset number of the single cells (1111) aligned in a single row up and down; in each of the second-level cell modules (110), the plurality of single cells (1111) are connected in series through the plurality of second connection rows (112); the first insulating plate (113) is used for insulating treatment between the plurality of single cells (1111) and the plurality of second connection rows (112); The buffer foam (410) is laid on the first insulating plate (113), and the second insulating plate (114) is fixedly installed on the first insulating plate (113) through the buffer foam (410) on the first insulating plate (113); the second insulating plate (114) is used for insulation treatment between the two cell secondary modules (110).

3. The battery pack with a pre-tightening structure for the battery cell according to claim 2, characterized in that, Each single cell (1111) is a square cell, and the positive electrode terminal and the negative electrode terminal of each single cell (1111) are coplanar; In each cell secondary module (110), one electrode terminal of each single cell (1111) is aligned with the other electrode terminal of the adjacent single cell (1111).

4. The battery pack with a pre-tightening structure for an electric cell according to claim 3, characterized in that, The second preset quantity is a positive even number; Each cell secondary module (110) further includes: two third connection rows (115), a second connection terminal (1161) and a third connection terminal (1162); In each cell secondary module (110), one end of the two third connection rows (115) is respectively fixedly connected to a single cell (1111), and the other ends of the two third connection rows (115) are respectively fixedly connected to the second connection terminal (1161) and the third connection terminal (1162); the two single cells (1111) fixedly installed with the third connection rows (115) are located at both ends of the same cell tertiary module (111). The second connection terminal (1161) is fixedly connected to one end of the first connection row (120), and the third connection terminal (1162) is electrically connected to the first connection terminal (332).

5. The battery pack with a pre-tightening structure for an electric cell according to claim 4, characterized in that, Each cell secondary module (110) further includes: at least one partition bracket (117), two upper and lower pressing brackets (118) and two left and right pressing brackets (119); In each cell secondary module (110), a plurality of cell tertiary modules (111) and at least one partition bracket (117) are arranged at intervals, and each partition bracket (117) is used for separating adjacent cell tertiary modules (111). Each upper and lower pressing bracket (118) includes: a plurality of upper and lower limiting grooves (1181) matching the shape of the cell tertiary module (111); The two upper and lower pressing brackets (118) are located on the upper and lower sides of the plurality of cell tertiary modules (111), and each partition bracket (117), the second connection terminal (1161) and the third connection terminal (1162) are fixedly installed on the two upper and lower pressing brackets (118). The two left and right pressing brackets (119) are located on the left and right sides of the plurality of cell tertiary modules (111), and the second insulating plate (114) and the two upper and lower pressing brackets (118) are fixedly installed on the two left and right pressing brackets (119).

6. The battery pack with a pre-tightening structure for an electric cell according to any one of claims 2-5, characterized in that Each of the cell three - level modules (111) further includes: a heat - conductive silicone film (1112) sleeved on the outer surface of the second - preset - number of single cells (1111), and a buffer silicone sheet (1113) laid between adjacent single cells (1111); The insulating paper (420) is also laid on the outer surface of the heat - conductive silicone film (1112).

7. The battery pack with a pre-tightening structure for the battery cell according to claim 4, wherein Fixing points (430) are provided on the first connection row (120), each of the second connection rows (112), each of the third connection rows (115), and the first wiring terminal (332); The battery management system component (200) is connected to each of the fixing points (430) through an information collection line (440).

8. The battery pack with a pre-tightening structure for an electric cell according to claim 4, characterized in that, The first wiring terminal (332) includes: two positive - pole wiring terminals (3321), two negative - pole wiring terminals (3322), and a ground - protection bolt (3323); Both of the two positive - pole wiring terminals (3321) are electrically connected to one of the third wiring terminals (1162), and both of the two negative - pole wiring terminals (3322) are electrically connected to the other third wiring terminal (1162).

9. The battery pack with a pre-tightening structure for an electric cell according to claim 1, wherein The front - panel assembly (330) further includes: two symmetrically - arranged handles (333) fixedly installed on the front - panel structural member (331).

10. A backup power supply, characterized in that, Comprising: A power control device, and a cell pre - tightening structure battery pack as described in any one of claims 1 to 9 and electrically connected to the power control device; When the power supply of the electrical equipment is cut off, the power control device is used to control the cell pre - tightening structure battery pack to supply power to the electrical equipment.

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