Stacked battery pack

Abstract

The utility model discloses a stacked battery pack, which is characterized in that a stacked battery module is placed inside a battery box body, thermal insulation cotton is tightly attached to the stacked battery module and the battery box body, a PC (polycarbonate) protective cover is tightly attached to the stacked battery module, the battery box body close to the stacked battery module is tightly attached and locked with a battery cell explosion-proof valve, and a BMS (battery management system) control panel is tightly attached to the left side of the battery box body. The stacking terminals are arranged on the upper surface and the lower surface of the left side of the box body of the battery box and form a loop with the BMS control panel, and the PC protective cover is tightly attached to the battery cell explosion-proof valve of the battery cell of the stacked battery module, so that a PC battery cell explosion-proof valve channel for liquid exploded from the explosion-proof valve to flow to the box body is formed. The stacked battery pack disclosed by the utility model can be used for storing electric energy and can be used for transmitting electric energy to equipment needing electricity, such as families and the like. According to the battery pack, the purposes of improving the energy density of the battery and improving the safety performance of the battery can be achieved, and normal work of the battery pack can be achieved through heating and heat preservation in a low-temperature state.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a stacked battery pack. Background Art

[0002] In recent years, the development of electrochemical energy storage technology has received extensive attention. Due to its advantages such as high energy density and low self-discharge rate, lithium iron phosphate batteries have become one of the most competitive electrochemical energy storage products in the fields of portable mobile power, household energy storage, electric vehicles, and industrial and commercial energy storage. However, with the gradual expansion of the use scale of lithium iron phosphate batteries, safety accidents such as combustion and explosion occur frequently. Most of the reasons behind are accidents caused by the failure of adjacent batteries due to battery thermal runaway. Therefore, the safety design of the battery pack can effectively prevent the thermal runaway of a single lithium iron phosphate battery and prevent adjacent lithium iron phosphate batteries from failing, burning, and exploding at high temperatures. It is a key means to maintain the safe operation of lithium-ion energy storage batteries and is of great significance for protecting the safety of people's lives and property.

[0003] In the prior art, after the battery modules inside the battery are assembled, structural adhesive needs to be filled inside the battery to fill the space of the battery. However, the internal filling of structural adhesive has a high cost, affects the heat dissipation effect of the battery, and also affects the emission of the core smoke in the case of battery out of control, thus affecting the reliability of the battery. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a stacked battery pack to solve the above technical problems.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A stacked battery pack includes a battery box body, a box cover, stacked battery modules, a PC protective cover, a core explosion-proof valve, a BMS control board, heat-insulating cotton, stacked terminals, and a PC core explosion-proof valve channel. The stacked battery modules are placed inside the battery box body, the top of the battery box body is sealed with a box cover, the heat-insulating cotton is closely attached to the stacked battery modules and the battery box body, the PC protective cover is closely attached to the stacked battery modules, the battery box body close to the stacked battery modules is closely locked with the core explosion-proof valve, the BMS control board is closely attached to the left side of the battery box body, the stacked terminals are installed on the upper and lower parts of the left side of the battery box body and form a circuit with the BMS control board. The PC protective cover is closely attached to the core explosion-proof valve of the stacked battery module core, so as to form a PC core explosion-proof valve channel for the liquid burst out from the explosion-proof valve to flow to the box body on the core explosion-proof valve of the module.

[0007] The stacked battery module is composed of a plurality of battery cells arranged in a row, and each battery cell is provided with a battery cell explosion-proof valve. Aerogel is pasted between the battery cells. A 3.5-mm fireproof and high-temperature resistant foam is pasted between the left end plate of the battery cell and the battery cell. A 3.5-mm fireproof and high-temperature resistant foam is pasted between the right end plate of the battery cell and the battery cell. A 0.5-mm bottom insulating sheet PC is closely attached to the bottom of the battery cell. A bottom fixing plate is installed at the bottom of the bottom insulating sheet PC. A pole insulating sheet PC is pasted on the battery cell and a steel strip is sleeved thereon to form a single battery module. The single battery modules are stacked together and fixed to the battery box body with a bracket and locked tightly with a fastener bolt.

[0008] Compared with the prior art, the present utility model has the following advantages: The stacked battery pack of the present utility model can be used to store electric energy and can supply electric energy to devices that need electricity such as families. The battery pack can solve the technical problems of low battery energy density and low safety performance in the prior art, and the problem that the battery cannot work at low temperatures. That is to say, the battery pack can achieve the purpose of improving the battery energy density and improving the battery safety performance, and the battery pack can also work normally through heating and heat preservation at low temperatures. Description of the Drawings

[0009] Figure 1 It is an exploded view structural schematic diagram of the battery module of the battery pack of the present utility model put into the box.

[0010] Figure 2 It is a schematic diagram of the battery module of the battery pack of the present utility model.

[0011] Figure 3 It is a cross-sectional view of the air duct of the battery module of the battery pack of the present utility model.

[0012] Figure 4 It is a schematic diagram of the protective cover of the battery pack of the present utility model.

[0013] In the figure: battery box body 10, box cover 11, stacked battery module 12, PC protective cover 13, battery cell explosion-proof valve 14, BMS control board 15, heat-insulating cotton 16, stacked terminal 17, PC battery cell explosion-proof valve channel 18, battery cell 120, aerogel 121, end plate 122, fireproof and high-temperature resistant foam 123, bottom insulating sheet PC 124, bottom fixing plate 125, pole insulating sheet PC 126, steel strip 127, bracket 128. Detailed Embodiment

[0014] The present utility model will be further elaborated in detail below in conjunction with the drawings and specific embodiments.

[0015] A stacked battery pack, comprising a battery box body 10, a box cover 11, a stacked battery module 12, a PC protective cover 13, a cell explosion-proof valve 14, a BMS control board 15, a heat-insulating cotton 16, a stacked terminal 17, and a PC cell explosion-proof valve channel 18. The stacked battery module 12 is placed inside the battery box body 10, and the top of the battery box body 10 is encapsulated with the box cover 11. The heat-insulating cotton 16 is closely attached to the stacked battery module 12 and the battery box body 10. The heat-insulating cotton is an EVA cotton that can insulate and keep warm, and is attached to the side of the box body, in the middle between the battery module and the box body. When the battery pack is in a low-temperature situation and the battery module is heating up, the heat-insulating cotton can keep warm, effectively helping to promote the temperature consistency of each cell in the module, thereby ensuring the stable performance and safe use performance of the cells.

[0016] The PC protective cover 13 is closely attached to the stacked battery module 12, and the PC protective cover is a PC insulating sheet with flame retardancy and high temperature resistance. The PC protective cover includes the battery module at the bottom and the battery module stacked on the upper part. The cell explosion-proof valve channels formed by the protective covers of the two will protect the busbars on both sides of the cell from being affected, and the gas generated by the cell will be concentrated and confluent at the box body explosion-proof valve through the protective cover. The PC protective cover is attached to the battery module, playing an insulating and protective role to prevent foreign objects from scratching the cell and puncturing it, resulting in battery failure and affecting the safety performance of the cell. The PC protective cover is attached to the battery module, which can protect the series busbar, voltage sampling line, and temperature sampling line, avoiding damage to the wires, resulting in sparks inside the box body and affecting the safety of the cell.

[0017] The battery box body 10 close to the stacked battery module 12 is closely attached and locked with the cell explosion-proof valve 14. The BMS control board 15 is closely attached to the left side of the battery box body 10. The stacked terminals 17 are installed on the upper and lower parts of the left side of the battery box body 10, forming a circuit with the BMS control board 15. The PC protective cover 13 is closely attached to the cell explosion-proof valve 14 of the cells of the stacked battery module 12, thereby forming a PC cell explosion-proof valve channel 18 through which the liquid ejected by the explosion of the explosion-proof valve on the module cell flows to the box body, flowing left and right, and then flowing to the bottom of the box body, avoiding the contact between the electrolyte and the cell busbar to corrode the busbar, and avoiding corroding the voltage sampling line on the busbar, thereby avoiding the damage of the sampling line that may cause sparks in the cell and ensuring the safety of the battery module.

[0018] The stacked battery module 12 is composed of a plurality of battery cells 120 arranged. Each battery cell 120 is provided with a battery cell explosion-proof valve 14. Aerogel 121 is pasted between the battery cells 120. A 3.5-mm fireproof and high-temperature resistant foam 123 is pasted between the left end plate 122 of the battery cell and the battery cell 120, and a 3.5-mm fireproof and high-temperature resistant foam 123 is pasted between the right end plate 122 of the battery cell and the battery cell 120, which plays a role in heat insulation and heat preservation. When the battery is charged and discharged for a long time, the expansion of the battery also plays a role in buffering and heat insulation. During the heating process of the battery pack at -10 degrees Celsius, the high-temperature resistant fireproof foam can also play a role in keeping the battery warm, avoiding uneven temperature distribution of the battery module under low temperature for a long time, different battery operating conditions, resulting in capacity attenuation and serious battery damage.

[0019] The bottom of the battery cell is closely attached to a 0.5-mm bottom insulating sheet PC124. A bottom fixing plate 125 is installed at the bottom of the bottom insulating sheet PC124. A pole column insulating sheet PC126 is pasted on the battery cell and a steel strip 127 is sleeved, forming a single battery module. The single battery modules are stacked together and fixed on the battery box body 10 with a bracket 128 and locked with a fastener bolt.

[0020] The PC protective cover 13 needs to be resistant to high temperature and use a high-temperature adhesive with relatively high bonding strength. The material of the PC protective cover is also a PI film (polyimide) that is resistant to high temperature, which is famous for its excellent high-temperature resistance, mechanical strength, electrical insulation, and chemical corrosion resistance. It can play a protective role for other components when the battery cell gets out of control.

[0021] The stacked module 12 is inside the battery box body 10. An electrolyte flow channel (PC protective cover 12 channel) is formed on the battery cell explosion-proof valve in the module. When the battery cell fails in an extreme case and expands, the gas generated after bursting open the explosion-proof valve will quickly disperse in the sealed battery box. When the pressure of the gas generated by a single battery cell is greater than the weakest fatigue resistance strength pressure of the battery box body 10 and the box cover 11, the battery cell explosion-proof valve 14 of the battery box body will automatically open to release the gas inside the box body of the battery cell, thus ensuring that the battery box will not bulge, break open the box cover and injure people or knock down the wall, avoiding safety accidents. At the same time, the electrolyte generated by the battery cell will also be discharged through the explosion-proof valve 14.

[0022] The battery cell explosion-proof valve 14 is provided on the box body side close to the module. In a sealed environment of the battery box, when the battery pack is working normally, it can ensure the dryness inside the battery box. Only in extreme cases will the explosion-proof valve 14 of the battery cell open to ensure the safety of the battery.

[0023] The above is a preferred embodiment of the present utility model. For those of ordinary skill in the art, according to the teachings of the present utility model, without departing from the principle and spirit of the present utility model, the changes, modifications, substitutions and variations made to the implementation manners still fall within the protection scope of the present utility model.

Claims

1. A stacked battery pack, characterized in that: It includes a battery box body, a box cover, a stacked battery module, a PC protective cover, a battery cell explosion-proof valve, a BMS control board, thermal insulation cotton, stacking terminals, and a PC battery cell explosion-proof valve channel. The stacked battery module is placed inside the battery box body, the top of the battery box body is encapsulated by a box cover, the thermal insulation cotton is close to the stacked battery module and the battery box body, the PC protective cover is close to the stacked battery module, the battery box body close to the stacked battery module and the battery cell explosion-proof valve are tightly locked, the BMS control board is close to the left side of the battery box body, the stacking terminals are installed on the upper and lower left side of the battery box body, and form a loop with the BMS control board, the PC protective cover is close to the battery cell explosion-proof valve of the stacked battery module battery cell, so as to form a PC battery cell explosion-proof valve channel on the module battery cell explosion-proof valve, through which the liquid exploded from the explosion-proof valve flows to the box body.

2. A stacked battery pack as claimed in claim 1, characterized in that: The stacked battery module is composed of a plurality of battery cells, and each battery cell is provided with a battery cell explosion-proof valve, aerogel is pasted between the battery cells, 3.5mm fireproof and high-temperature resistant foam is pasted between the left end plate of the battery cell and the middle of the battery cell, 3.5mm fireproof and high-temperature resistant foam is pasted between the right end plate of the battery cell and the middle of the battery cell, the bottom of the battery cell is closely attached to a 0.5mm bottom insulating sheet PC, a bottom fixing plate is installed at the bottom of the bottom insulating sheet PC, a pole insulating sheet PC is pasted on the battery cell and a steel belt is put on it to form a single battery module, and the single battery modules are stacked together and fixed to the battery box body with a bracket, and locked with fastener bolts.

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