Single battery, battery pack and electric equipment

Abstract

The invention discloses a single battery, a battery pack and electric equipment, and belongs to the technical field of power batteries, the battery pack has a first direction, a second direction and a third direction which intersect with one another, the battery pack comprises a box body, a battery module and a cooling plate, the box body comprises a shell and a bottom plate, the shell is connected with the bottom plate, and the battery module is connected with the cooling plate. The shell is arranged in a surrounding mode in the circumferential direction of the bottom plate to form a containing cavity. The plurality of battery modules are arranged in the accommodating cavity at intervals in the second direction, each battery module comprises a plurality of single batteries, and the plurality of single batteries are sequentially stacked in the first direction and are connected with the shell; and the two sides, extending in the third direction, of the single batteries are of zigzag structures. The cooling plates are arranged on the two sides, extending in the third direction, of each battery module and connected with the shell, and the cooling plates are in a zigzag shape and are matched with the two sides, in the zigzag structure, of the single batteries. Through the design of the zigzag structure, the cooling plate can be in better contact with the single battery, the cooling area of the single battery is increased, and the heat conduction and heat dissipation effects are improved.

Description

Technical Field

[0001] The present application belongs to the technical field of power batteries, and specifically relates to a single cell, a battery pack and an electrical device. Background Art

[0002] With the rise of new energy vehicles, factors such as the energy density of the battery pack and the electric vehicle platform determine different battery pack designs. As the industrialization of the power electricity industry accelerates, the volume, grouping efficiency and safety design of the battery pack has become a hot topic of current research, resulting in more blade battery pack design schemes.

[0003] Existing blade battery packs are mostly cooled at the top, bottom or both sides of the blade battery pack. When cooling is performed on both sides, due to the characteristics of the blade battery, the cooling area on both sides is smaller than that of other batteries, so the cooling efficiency is low. Summary of the invention

[0004] An embodiment of the present application provides a single cell battery, aiming to improve cooling efficiency; another object of the embodiment of the present application is to provide a battery pack; another object of the embodiment of the present application is to provide an electrical device.

[0005] An embodiment of the present application provides a single battery, comprising:

[0006] A battery body, wherein the battery body has a serrated structure on both sides of the length direction;

[0007] The first explosion-proof valve is arranged on at least one serrated side wall of the battery body.

[0008] An embodiment of the present application further provides a battery pack, the battery pack having a first direction, a second direction, and a third direction intersecting each other, the battery pack comprising:

[0009] A box body, the box body comprising a shell and a bottom plate, the shell is connected to the bottom plate, and the shell is arranged around the bottom plate to form a receiving cavity;

[0010] A plurality of battery modules are arranged in the accommodating cavity at intervals along the second direction, the battery modules include a plurality of single cells, the plurality of single cells are stacked in sequence along the first direction and connected to the housing; the single cells include a battery body and a first explosion-proof valve, the battery body has a serrated structure on both sides of the second direction, and the first explosion-proof valve is arranged on both sides of the serrated structure of the battery body;

[0011] A cooling plate is arranged on both sides of each battery module in the second direction and connected to the shell. The cooling plate is serrated and matched with the two sides of the serrated structure of the single battery.

[0012] In some embodiments, the housing comprises:

[0013] two first side beams, arranged opposite to each other in the second direction and connected to the bottom plate;

[0014] Two second side beams are arranged opposite to each other in the first direction and connected to the bottom plate, and one end of the second side beam is connected to one of the first side beams, and the other end is connected to another of the first side beams;

[0015] A crossbeam is arranged between two adjacent battery modules and connected to the bottom plate.

[0016] In some embodiments, the cooling plate connected to the first side beam is disposed on one side of the first side beam facing the battery module, and a first exhaust channel is formed between the first side beam and the adjacent cooling plate;

[0017] The housing has a second exhaust passage, the second exhaust passage is opened in the second side beam and communicates with the first exhaust passage;

[0018] The cooling plates connected to the cross beam are arranged on both sides of the cross beam, a third exhaust channel is formed between the cross beam and the adjacent cooling plates, and the third exhaust channel, the second exhaust channel and the first exhaust channel are interconnected.

[0019] In some embodiments, the cooling plate includes a cooling plate body, which is disposed on both sides of each battery module in the second direction and connected to the housing;

[0020] The cooling plate further has a flow channel, and the flow channel penetrates the cooling plate body along the first direction.

[0021] In some embodiments, the cooling plate includes a fourth exhaust channel, and the fourth exhaust channel runs through the cooling plate body; the fourth exhaust channel on the cooling plate connected to the first side beam is communicated with the first exhaust channel, and the fourth exhaust channel on the cooling plate connected to the cross beam is communicated with the third exhaust channel;

[0022] The fourth exhaust channel, the first exhaust channel, and the third exhaust channel are all in communication with the second exhaust channel.

[0023] In some embodiments, the battery pack also includes a second explosion-proof valve, which is arranged on a side of the second side beam away from the battery module, and the gas generated by the pressure release of the first explosion-proof valve enters the first exhaust channel and the third exhaust channel through the fourth exhaust channel, and then enters the second exhaust channel, and then is discharged from the battery pack through the second explosion-proof valve.

[0024] In some embodiments, the battery pack further includes a thermally conductive pad, which is disposed between the battery module and the cooling plate and connected to the cooling plate.

[0025] The embodiments of the present application also disclose an electrical device, including the single cell battery described in the above embodiments, or including the battery pack described in the above embodiments.

[0026] The various embodiments of the present application have the following beneficial effects:

[0027] A single cell in an embodiment of the present application comprises a battery body and a first explosion-proof valve. The battery body has a serrated structure on both sides of its length direction, and the first explosion-proof valve is arranged on both sides of the serrated battery body; the serrated design on both sides of the single cell makes the heat dissipation surface and cooling surface of the single cell larger than those of existing batteries, and the heat dissipation effect and cooling effect are improved. Moreover, the single cell can release the internal pressure through the first explosion-proof valve when an abnormal situation occurs in the battery pack, such as overpressure or overheating, to ensure the safety of the internal environment of the battery pack; in the present application, the first explosion-proof valve is arranged on both sides of the battery body, the number of the first explosion-proof valves is increased, and the first explosion-proof valves on both sides are exhausted at the same time, which increases the pressure relief speed, realizes the function of rapid exhaust, and improves the safety performance of the battery pack. In addition, the single cell has a serrated structure on both sides of its length direction, so more than one first explosion-proof valve can be arranged on one side of the battery body, further increasing the number of the first explosion-proof valves, thereby further increasing the pressure relief speed and realizing a faster exhaust function.

[0028] A battery pack according to an embodiment of the present application comprises a box, a battery module and a cooling plate, wherein the box comprises a shell and a bottom plate, the shell is connected to the bottom plate, and the shell is arranged around the bottom plate to form a receiving cavity. A plurality of battery modules are arranged in the receiving cavity at intervals along the second direction, the battery module comprises a plurality of single cells, the plurality of single cells are stacked in sequence along the first direction and connected to the shell; the two sides of the single cells extending along the third direction are in a serrated structure. The cooling plate is arranged on both sides of each battery module extending along the third direction and connected to the shell, and the serrated shape of the cooling plate is adapted to the two sides of the serrated structure of the single cell. The present application designs the two sides of the single cell extending along the third direction as a serrated structure, and accordingly designs the cooling plate to be serrated, which can increase the surface area of ​​the single cell, enable the cooling plate to better contact the single cell and increase the cooling area of ​​the single cell, thereby improving the heat conduction and heat dissipation effect.

[0029] The electric device of the embodiment of the present application includes the single cell or the battery pack as described in the above embodiment, and thus can have all the technical features and technical effects of the single cell or battery pack, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic diagram of the overall structure of a single cell provided in an embodiment of the present application;

[0032] Figure 2 A schematic diagram of the overall structure of a battery pack provided in an embodiment of the present application;

[0033] Figure 3 A schematic diagram of the overall structure of the box provided in the embodiment of the present application;

[0034] Figure 4 A diagram showing the position relationship between the cooling plate and the battery module provided in an embodiment of the present application;

[0035] Figure 5 A schematic diagram of the overall structure of a cooling plate provided in an embodiment of the present application;

[0036] Figure 6 A schematic diagram of the position relationship between the first side beam and the cooling plate provided in an embodiment of the present application;

[0037] Figure 7 A schematic diagram of the position relationship between the crossbeam and the cooling plate provided in the embodiment of the present application;

[0038] Figure 8 A schematic diagram of the overall structure of the thermal pad provided in an embodiment of the present application;

[0039] Reference numerals:

[0040] X-first direction; Y-second direction; Z-third direction;

[0041] 10-box; 11-shell; 111-first side beam; 112-second side beam; 113-cross beam; 12-bottom plate; 13-accommodating cavity;

[0042] 20-battery module; 21-monocell; 211-battery body; 212-first explosion-proof valve;

[0043] 30-cooling plate; 31-cooling plate body; 32-flow channel; 33-third exhaust channel;

[0044] 40- first exhaust passage;

[0045] 50 - third exhaust passage;

[0046] 60- second explosion-proof valve;

[0047] 70-thermal pad;

[0048] 80 - Through hole. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In the description of the present application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are an "or" relationship. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0051] Those skilled in the art will appreciate that the drawings are only schematic diagrams of example embodiments and may not be to scale. The modules or processes in the drawings are not necessarily required to implement the present application and therefore cannot be used to limit the scope of protection of the present application.

[0052] With the rise of new energy vehicles, factors such as the energy density of the battery pack and the electric vehicle platform determine different battery pack designs. As the industrialization of the power electricity industry accelerates, the volume, grouping efficiency and safety design of the battery pack has become a hot topic of current research, resulting in more blade battery pack design schemes.

[0053] The design feature of blade batteries is that they are long and narrow, so the cooling area on both sides is relatively small. In contrast, batteries of other shapes can make fuller use of the entire surface for cooling, but the cooling area of ​​blade batteries is limited, resulting in low cooling efficiency. In addition, the cooling medium (such as coolant) needs to flow through narrow channels, which results in a slower flow rate and limited cooling effect.

[0054] In view of this, an embodiment of the present application provides a battery pack, aiming to solve at least part of the above-mentioned technical problems.

[0055] See also Figures 1 to 8 , the present application embodiment provides a single battery, please refer to Figure 1 , Figure 1 The overall structure diagram of the single cell provided in the embodiment of the present application. The single cell includes a battery body 211 and a first explosion-proof valve 212. The battery body 211 has a serrated structure on both sides of its length direction, and the first explosion-proof valve 212 is arranged on at least one serrated side wall of the battery body 211. Such a design can release the internal pressure through the first explosion-proof valve 212 when an abnormal situation occurs in the battery pack, such as overpressure or overheating, to ensure the safety of the internal environment of the battery pack.

[0056] It should be noted that when the first explosion-proof valve 212 is set on both sides of the battery body 211, the number of the first explosion-proof valve 212 increases compared to setting the first explosion-proof valve 212 on one side, and the first explosion-proof valves 212 on both sides exhaust gas at the same time, which increases the pressure relief speed, realizes the function of rapid exhaust, and improves the safety performance of the battery pack. In addition, the battery body 211 has a serrated structure on both sides of its length direction, so one or more first explosion-proof valves 212 can be set on any side wall of the battery body 211. When multiple first explosion-proof valves 212 are set, the number of the first explosion-proof valves 212 is further increased, thereby further increasing the pressure relief speed and realizing a faster exhaust function.

[0057] The present application embodiment provides a battery pack. Figure 2 and Figure 3 , Figure 2 The overall structural diagram of the battery pack provided in the embodiment of the present application is as follows: Figure 3Schematic diagram of the overall structure of the box provided in the embodiment of the present application. The battery pack includes a box 10, a battery module 20 and a cooling plate 30, wherein the box 10 includes a shell 11 and a bottom plate 12, the shell 11 is connected to the bottom plate 12, and the shell 11 is arranged around the bottom plate 12 to form a receiving cavity 13. A plurality of battery modules 20 are arranged in the receiving cavity 13 at intervals along the second direction Y, and the battery module 20 includes a plurality of single cells 21, and the plurality of single cells 21 are stacked in sequence along the first direction X and connected to the shell 11; the single cell 21 includes a battery body 211 and a first explosion-proof valve 212, and the battery body 211 has a serrated structure on both sides of the second direction Y, and the first explosion-proof valve 212 is arranged on both sides of the battery body 211 in the serrated shape. The cooling plate 30 is arranged on both sides of each battery module 20 in the second direction Y and connected to the shell 11, and the serrated shape of the cooling plate 30 is adapted to the serrated structure of the two sides of the single cell 21.

[0058] It should be noted that in the drawings of the embodiments of the present application, the arrow marked with X represents the first direction X, the arrow marked with Y represents the second direction Y, and the arrow marked with Z represents the third direction Z. The description of the present application introduces the first direction X, the second direction Y and the third direction Z in order to more clearly describe the structure and relative position relationship of each component in the battery pack. In practical applications, the first direction X, the second direction Y and the third direction Z can point to any orientation in space. In some embodiments, in the battery pack, the first direction X corresponds to the width direction of the battery pack, the second direction Y and the third direction Z intersect, and the second direction Y is the length direction of the battery pack, and the third direction Z is the height direction of the battery pack. Optionally, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0059] It should be noted that the battery pack of this embodiment is a blade battery pack. The single cells in the blade battery pack are designed to be in the shape of a long and thin blade. This design makes the most of the space between the single cells, thereby improving the energy density and power density of the battery pack. The blade battery pack adopts a compact structure, which allows the single cells to be arranged more closely together. This can reduce the overall volume of the battery pack, improve the energy storage efficiency of the battery pack, and better adapt to the needs of different vehicles and application scenarios. The single cells in the blade battery pack adopt an interference fit connection method, which makes the current distribution between the single cells more uniform and reduces the resistance and voltage drop between the single cells. This can improve the overall performance and reliability of the battery pack.

[0060] It should be noted that if Figure 1As shown, the battery body 211 has a sawtooth structure on both sides in the second direction Y, and the two sides of the sawtooth structure of the battery body 211 are symmetrical structures. Among them, the sawtooth structure satisfies at least one sawtooth and at most three sawtooths. When there is one sawtooth, the battery body 211 is V-shaped on both sides in the second direction Y, and the side wall of the battery body 211 is also V-shaped; when there are two sawtooths, the battery body 211 is W-shaped on both sides in the second direction Y, and the side wall of the battery body 211 is also W-shaped; when there are three sawtooths, the battery body 211 has a wavy structure with three V-shaped structures connected in sequence on both sides extending in the second direction Y, and the side wall of the battery body 211 is also wavy.

[0061] Please note that Figure 5 , Figure 5 Schematic diagram of the overall structure of the cooling plate provided in the embodiment of the present application. The serrated shape of the cooling plate 30 is adapted to the two sides of the serrated structure of the battery body 211, and the serrated shape of the cooling plate 30 satisfies at least one serration and at most three serrations. When the battery body 211 has one serration, the cooling plate 30 is also one serration in a V shape; when the battery body 211 has two serrations, the cooling plate 30 is also two serrations in a W shape; when the battery body 211 has three serrations, the cooling plate 30 is also three serrations in a structure composed of three V-shaped structures connected in sequence. This mutually adapted design can make the cooling plate 30 fit tightly with the serrated structure of the battery body 211, maximize the cooling area, and improve the cooling efficiency.

[0062] In view of this, since the design characteristics of the blade battery are long and narrow, the cooling area on both sides is relatively small, resulting in low cooling efficiency. In this embodiment, the two sides of the single battery 21 extending along the third direction Z are designed to be serrated structures, and the cooling plate 30 is correspondingly designed to be serrated, which can increase the surface area of ​​the single battery 21, so that the cooling plate 30 can better contact the single battery 21 and the cooling area of ​​the single battery 21 is increased, thereby improving the heat conduction and heat dissipation effect. That is, by increasing the cooling area, the single battery 21 in this embodiment can dissipate heat more effectively, reduce heat accumulation, and improve the working efficiency and life of the battery pack. At the same time, since the cooling plate 30 is compatible with the structure of the single battery 21, it can ensure the uniform flow of the cooling medium in the entire battery module 20, further improving the cooling effect.

[0063] In some embodiments, see Figure 2 , Figure 3 and Figure 4 As shown, Figure 4A diagram showing the positional relationship between the cooling plate and the battery module provided in an embodiment of the present application. The housing 11 includes two first side beams 111, two second side beams 112 and a cross beam 113. The arrangement and connection of these components help to provide a stable structural support and protect the internal components of the battery pack. Specifically, the two first side beams 111 are arranged relative to each other in the second direction Y and are connected to the bottom plate 12. Such an arrangement can increase the stability of the housing 11 and ensure that the battery pack is not easily deformed or affected by external impacts during use. The two second side beams 112 are arranged relative to each other in the first direction X and are connected to the bottom plate 12. Among them, one end of the second side beam 112 is connected to a first side beam 111, and the other end is connected to another first side beam 111. This connection method can further enhance the rigidity and stability of the housing 11 and ensure that the battery pack is not easily deformed or damaged under vibration or other external forces. The cross beam 113 is arranged between two adjacent battery modules 20 and is connected to the bottom plate 12. The provision of the crossbeam 113 can provide additional support and reinforcement to ensure that the spacing and position between the battery modules 20 remain stable. This helps prevent the battery modules 20 from moving or colliding during transportation or use, and improves the structural strength and safety of the entire battery pack.

[0064] Please note that Figure 4 and Figure 6 , Figure 6 Schematic diagram of the position relationship between the first side beam and the cooling plate provided in the embodiment of the present application. The first side beam 111 is L-shaped, and one side thereof extending along the second direction Y is fixed to the bottom plate 12, and one side of the first side beam 111 extending along the third direction Z is connected to the cooling plate 30, for fixing and supporting the cooling plate 30. Figure 3 and Figure 7 , Figure 7 Schematic diagram of the position relationship between the crossbeam and the cooling plate provided in the embodiment of the present application. The crossbeam 113 is T-shaped, and one side of the crossbeam 113 extending along the second direction Y is fixed to the bottom plate 12, and one side of the crossbeam 113 extending along the third direction Z is connected to the cooling plate 30 for fixing and supporting the cooling plate 30.

[0065] In view of this, the present embodiment adopts a specific structural design of the housing 11 so that the housing 11 can provide stable external protection and support to ensure the safety and stability of the battery module 20. At the same time, the connection method of the bottom plate 12 also plays a role in strengthening the overall structure.

[0066] In some embodiments, Figure 4 and Figure 6As shown, a cooling plate 30 connected to the first side beam 111 is provided on one side of the first side beam 111 facing the battery module 20, and a first exhaust channel 40 is formed between the first side beam 111 and the adjacent cooling plate 30. Such a design allows the gas generated when the battery pack is depressurized to be discharged through the first exhaust channel 40. The shell 11 has a second exhaust channel (not shown in the figure), which is opened in the second side beam 112 and connected to the first exhaust channel 40. Such a setting allows the gas to flow from the first exhaust channel 40 to the second exhaust channel for further discharge. Cooling plates 30 connected to the cross beam 113 are provided on both sides of the cross beam 113, and a third exhaust channel 50 is formed between the cross beam 113 and the adjacent cooling plate 30, and the third exhaust channel 50, the second exhaust channel and the first exhaust channel 40 are connected to each other. Such a design allows the gas to be discharged from the second exhaust channel through the third exhaust channel 50.

[0067] It should be noted that if Figure 6 As shown, a cooling plate 30 connected to the first side beam 111 is disposed on one side of the first side beam 111 facing the battery module 20. The first side beam 111 and the cooling plate 30 can be processed into an integrated structure, that is, when the first side beam 111 is manufactured, the cooling plate 30 is simultaneously processed on the first side beam 111. Cooling plates 30 connected to the cross beam 113 are disposed on both sides of the cross beam 113. The cross beam 113 and the two cooling plates 30 can be processed into an integrated structure, that is, when the cross beam 113 is manufactured, the two cooling plates 30 are simultaneously processed on the cross beam 113.

[0068] It should be noted that reinforcing ribs are provided in the first exhaust channel 40. The structural design of the first side beam 111, the reinforcing ribs and the cooling plate 30 can improve the anti-extrusion ability of the battery pack. At the same time, combined with the serrated structural design of the cooling plate 30, the serrations are triangular, and the triangle has better stability, which further improves the anti-extrusion and vehicle column collision abilities of the battery pack and improves the safety performance of the battery pack.

[0069] In view of this, the present embodiment provides the cooling plate 30, the first exhaust channel 40, the second exhaust channel, and the third exhaust channel 50 so as to effectively exhaust the gas generated when the battery pack is depressurized. This helps to maintain the pressure balance inside the battery pack and prevent excessive pressure from damaging the battery.

[0070] In some embodiments, Figure 5As shown, the cooling plate 30 includes a cooling plate body 31, which is arranged on both sides of each battery module 20 in the second direction Y and connected to the shell 11. Such a design can make the cooling plate 30 in close contact with the battery module 20 so as to effectively conduct and dissipate heat. The cooling plate 30 also has a flow channel 32, and the flow channel 32 runs through the cooling plate body 31 along the first direction X. Such an arrangement allows the cooling medium to flow in the flow channel 32 to absorb the heat generated by the battery module 20. It should be noted that the cooling plate 30 has a basic structure injection hole and a liquid outlet hole for passing the coolant and discharging the coolant, which will not be described in detail in this embodiment.

[0071] It should be noted that there may be multiple flow channels 32 , the multiple flow channels 32 are interconnected, and the multiple flow channels 32 all penetrate the cooling plate body 31 along the first direction X. The multiple flow channels 32 can allow the cooling medium to flow in a wider area, thereby more effectively absorbing the heat generated by the battery module 20 .

[0072] In view of this, the present embodiment can effectively cool the battery module 20 and prevent problems caused by overheating by providing the cooling plate 30 and multiple flow channels 32. The cooling medium absorbs heat during the flow process and is discharged through the flow channels to achieve effective heat dissipation.

[0073] In some embodiments, Figure 6 As shown, the battery pack also has a fourth exhaust channel 33, which is opened on the cooling plate body 31. The fourth exhaust channel 33 on the cooling plate 30 connected to the first side beam 111 is connected to the first exhaust channel 40, and the fourth exhaust channel 33 on the cooling plate 30 connected to the cross beam 113 is connected to the third exhaust channel 50; the fourth exhaust channel 33, the first exhaust channel 40, and the third exhaust channel 50 are all connected to the second exhaust channel. Such an arrangement allows the gas generated when the first explosion-proof valve 212 is depressurized to be discharged through the fourth exhaust channel 33.

[0074] In view of this, the battery module 20 of this embodiment is equipped with a first explosion-proof valve 212, and is connected to the first exhaust channel 40 and the third exhaust channel 50 through the fourth exhaust channel 33 on the cooling plate 30. Such a design can discharge the generated gas in time when an abnormal situation occurs in the battery pack to maintain the pressure balance inside the battery pack and prevent excessive pressure from damaging the battery. It should be noted that the position and size of the fourth exhaust channel 33 can be adjusted according to actual needs to ensure connectivity with the first explosion-proof valve 212 and achieve effective gas discharge. In addition, other through holes or channels can be designed according to specific circumstances to further improve the safety and performance stability of the battery pack.

[0075] In some embodiments, Figure 2As shown, the battery pack also includes a second explosion-proof valve 60, which is arranged on a side of a second side beam 112 away from the battery module 20. Such a design can discharge the gas generated inside through the second explosion-proof valve 60 when an abnormal situation occurs in the battery pack to ensure the safety of the battery pack. Specifically, the gas generated by the pressure relief of the first explosion-proof valve 212 enters the first exhaust channel 40 and the third exhaust channel 50 through the fourth exhaust channel 33, then enters the second exhaust channel, and then is discharged from the battery pack through the second explosion-proof valve 60. Such a design can guide the gas from the battery module 20 to the second explosion-proof valve 60 to ensure the safe discharge of the gas.

[0076] In view of this, the present embodiment realizes the discharge of gas by setting a second explosion-proof valve 60, and through the first explosion-proof valve 212, the fourth exhaust channel 33, the first exhaust channel 40, the third exhaust channel 50 and the second exhaust channel. Such a design can discharge the generated gas in time when an abnormal situation occurs in the battery pack to maintain the pressure balance inside the battery pack and prevent excessive pressure from damaging the battery. That is, the integration of the exhaust channel connected to the outlet of each explosion-proof valve and the flow channels on the cooling plate 30 in the present embodiment can realize thermal and electrical separation. After the thermal runaway is triggered, the gas is discharged from the battery pack through the exhaust channel integrated with the cooling plate 30 through the second explosion-proof valve 60 of the battery pack. The exhaust channel between adjacent battery modules 20 adopts an independent structural design, and each column of battery cells has an independent exhaust channel, which improves the safety performance of the battery pack. In addition, the battery pack realizes dry-wet separation while achieving thermal and electrical separation. Water vapor outside the battery pack enters the battery pack through the second explosion-proof valve 60, and condensation is integrated inside the first exhaust channel 40 and the third exhaust channel 50 through the first exhaust channel 40, the third exhaust channel 50 and the circulating cooling water to avoid entering the battery pack, thereby achieving dry-wet separation and realizing the electrical safety performance of the battery pack.

[0077] In some embodiments, see Figure 2 , Figure 4 and Figure 8 , Figure 8 Schematic diagram of the overall structure of the thermal pad provided in an embodiment of the present application. The battery pack also includes a thermal pad 70, which is arranged between the battery module 20 and the cooling plate 30, and is connected to the cooling plate 30. Such a design can improve the heat conduction efficiency between the battery module 20 and the cooling plate 30. It should be noted that the function of the thermal pad 70 is to form a thermally conductive contact layer between the battery module 20 and the cooling plate 30. The thermal pad 70 can effectively conduct the heat generated by the battery module 20 to the cooling plate 30 for better heat dissipation. The thermal pad 70 is usually made of a thermally conductive material, such as a thermally conductive silicone or a thermally conductive film, and has good thermal conductivity and contact adaptability.

[0078] In some embodiments, Figure 8 As shown, the battery pack also has a through hole 80, which passes through the thermal pad 70 and is aligned with and connected to the fourth exhaust channel 33. It should be noted that the function of the through hole 80 is to provide a channel to connect the fourth exhaust channel 33 and the thermal pad 70. When the first explosion-proof valve 212 is depressurized, the generated gas can enter the fourth exhaust channel 33 through the through hole 80, and then pass through the first exhaust channel 40 and the third exhaust channel 50 into the second exhaust channel, and then smoothly discharge the battery pack through the second explosion-proof valve 60. Such a design allows the thermal pad 70 to realize its own function without interfering with the discharge of gas during pressure relief, thereby ensuring the effective discharge of gas and preventing excessive pressure from damaging the battery pack.

[0079] The present application also discloses an electric device, including a single cell as in the above embodiment, or a battery pack as in the above embodiment, so that it can have all the technical features and technical effects of the single cell or battery pack, which will not be described in detail here.

[0080] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0081] The single cell battery provided in the embodiments of the present application is introduced in detail above, and the principles and implementation methods of the present application are explained by applying specific examples. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application; ordinary technicians in this field should understand that: they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A single cell battery, characterized in that: include: A battery body, wherein the battery body has a serrated structure on both sides of the length direction; The first explosion-proof valve is arranged on at least one serrated side wall of the battery body.

2. The single cell according to claim 1, characterized in that: One or more first explosion-proof valves are arranged on any serrated side wall of the battery body.

3. A battery pack, characterized in that: The battery pack has a first direction, a second direction and a third direction intersecting each other, and the battery pack includes: A box body, the box body comprising a shell and a bottom plate, the shell is connected to the bottom plate, and the shell is arranged around the bottom plate to form a receiving cavity; A plurality of battery modules are arranged in the accommodating cavity at intervals along the second direction, the battery modules include a plurality of single cells, the plurality of single cells are stacked in sequence along the first direction and connected to the housing; the single cells include a battery body and a first explosion-proof valve, the battery body has a serrated structure on both sides of the second direction, and the first explosion-proof valve is arranged on both sides of the serrated structure of the battery body; A cooling plate is arranged on both sides of each battery module in the second direction and connected to the shell. The cooling plate is serrated and matched with the two sides of the serrated structure of the single battery.

4. The battery pack according to claim 3, characterized in that: The housing comprises: two first side beams, arranged opposite to each other in the second direction and connected to the bottom plate; Two second side beams are arranged opposite to each other in the first direction and connected to the bottom plate, and one end of the second side beam is connected to one of the first side beams, and the other end is connected to another of the first side beams; A crossbeam is arranged between two adjacent battery modules and connected to the bottom plate.

5. The battery pack according to claim 4, characterized in that: The cooling plate connected to the first side beam is disposed on one side of the first side beam facing the battery module, and a first exhaust channel is formed between the first side beam and the adjacent cooling plate; The housing has a second exhaust passage, the second exhaust passage is opened in the second side beam and communicates with the first exhaust passage; The cooling plates connected to the cross beam are arranged on both sides of the cross beam, a third exhaust channel is formed between the cross beam and the adjacent cooling plates, and the third exhaust channel, the second exhaust channel and the first exhaust channel are interconnected.

6. The battery pack according to claim 5, characterized in that: The cooling plate comprises a cooling plate body, which is arranged on both sides of each battery module in the second direction and connected to the housing; The cooling plate further has a flow channel, and the flow channel penetrates the cooling plate body along the first direction.

7. The battery pack according to claim 6, characterized in that: The cooling plate comprises a fourth exhaust channel, and the fourth exhaust channel runs through the cooling plate body; the fourth exhaust channel on the cooling plate connected to the first side beam is communicated with the first exhaust channel, and the fourth exhaust channel on the cooling plate connected to the cross beam is communicated with the third exhaust channel; The fourth exhaust channel, the first exhaust channel, and the third exhaust channel are all in communication with the second exhaust channel.

8. The battery pack according to claim 7, characterized in that: The battery pack also includes a second explosion-proof valve, which is arranged on a side of the second side beam away from the battery module, and the gas generated by the pressure relief of the first explosion-proof valve enters the first exhaust channel and the third exhaust channel through the fourth exhaust channel, then enters the second exhaust channel, and is discharged from the battery pack through the second explosion-proof valve.

9. The battery pack according to claim 7, characterized in that: The battery pack further includes a thermal pad, which is disposed between the battery module and the cooling plate and connected to the cooling plate.

10. An electrical device, characterized in that: It comprises a single cell as described in any one of claims 1 or 2 above, or it comprises a battery pack as described in any one of claims 3 to 9.

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