A battery pack and an electric device

Abstract

The utility model provides a kind of battery pack and electrical equipment, it is related to lithium battery technical field.The battery pack includes box, electric core subassembly and first explosion-proof valve, wherein box is sequentially provided with mounting cavity and gas storage cavity along length direction, electric core subassembly is located in mounting cavity, and it is provided with pressure relief side in width direction, and the exhaust passage that is communicated with gas storage cavity is formed between pressure relief side and mounting cavity cavity wall, first explosion-proof valve is set on gas storage cavity cavity wall, for when the gas that is introduced into gas storage cavity is discharged in electric core subassembly thermal runaway.Through the structure design, the gas generated by thermal runaway can be released by pressure relief side and be centrally introduced into independent gas storage cavity by exhaust passage.When reaching the starting value of first explosion-proof valve, gas is uniformly and orderly discharged by first explosion-proof valve, efficient pressure relief is realized.Therefore, the battery pack does not need to reserve additional exhaust space above electric core, so as to improve electric core arrangement efficiency and the energy density and performance of battery pack whole.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and more specifically, to a battery pack and an electrical device. Background Technology

[0002] In related technologies, after a battery pack experiences thermal runaway, it typically releases internal gases by incorporating a venting channel. Existing designs generally integrate the cell's explosion-proof valve and terminal post on top of the cell, utilizing the gap between the cell cover and the CCS (Cell Connection System) as a venting channel to achieve the exhaust function.

[0003] However, after in-depth research, the inventors discovered that space is usually quite compact in the height direction of the battery pack. If more gaps are reserved to ensure sufficient ventilation space, the usable space of the battery cells will be compressed, thereby sacrificing the capacity of the battery cells and affecting the overall energy density and performance. Utility Model Content

[0004] The purpose of this utility model is to provide a battery pack and electrical equipment that solves the problem of reduced battery capacity due to space constraints by setting an exhaust channel between the battery cell assembly and the side wall of the housing and guiding the gas to an independent gas storage chamber for unified discharge, thereby eliminating the need to reserve an exhaust gap above the battery cell.

[0005] The embodiments of this utility model can be implemented as follows: In a first aspect, this utility model provides a battery pack, comprising: The housing has an installation cavity and an air storage cavity arranged sequentially along a first direction, which is the length direction of the housing. The battery cell assembly is located inside the mounting cavity and has a pressure relief side along the second direction. An exhaust channel is formed between the pressure relief side and the cavity wall of the mounting cavity. The exhaust channel is connected to the gas storage cavity. The second direction is the width direction of the housing. The first explosion-proof valve is located on the wall of the gas storage chamber and is used to discharge the gas guided into the gas storage chamber through the exhaust channel in the event of thermal runaway of the battery cell assembly.

[0006] In an optional embodiment, the cell assembly includes a plurality of stacked cells, each cell having a second explosion-proof valve, and all second explosion-proof valves being located on the pressure relief side.

[0007] In an optional embodiment, the battery cell assembly further includes multiple cable ties for bundling and securing all the battery cells; the multiple cable ties are spaced apart along a third direction, and the second explosion-proof valve protrudes from the spaced positions; wherein, the third direction is the height direction of the housing.

[0008] In an optional embodiment, both sides of the battery cell assembly along the second direction are pressure relief sides, and the exhaust channels correspond one-to-one with the pressure relief sides and are all connected to the gas storage chamber.

[0009] In an optional embodiment, the battery pack further includes a crossbeam support, which is connected to the bottom wall of the housing and abuts against the cell assembly; and the crossbeam support is provided with an exhaust window communicating with the exhaust channel.

[0010] In an optional implementation, when there are at least two battery cell assemblies arranged along a first direction, the crossbeam bracket abuts between two adjacent battery cell assemblies along the first direction and connects the exhaust channels corresponding to the two adjacent battery cell assemblies through an exhaust window.

[0011] In an optional implementation, the crossbeam support divides the inner cavity of the housing into an installation cavity and an air storage cavity, and connects the exhaust channel to the air storage cavity through an exhaust window.

[0012] In an optional embodiment, when there are at least two battery cell assemblies arranged along a third direction, the crossbeam support is provided with protrusions on both sides along a first direction, the protrusions abutting between two adjacent battery cell assemblies along a third direction, wherein the third direction is the height direction of the housing.

[0013] In an optional implementation, the exhaust window corresponds one-to-one with the exhaust channel.

[0014] Secondly, this utility model provides an electrical device including a battery pack according to any of the foregoing embodiments.

[0015] The beneficial effects of the battery pack and electrical equipment provided in this embodiment of the present invention include: This invention provides a battery pack and electrical equipment. The battery pack includes a housing, a cell assembly, and a first explosion-proof valve. The housing has a mounting cavity and a gas storage cavity arranged sequentially along its length. The cell assembly is located within the mounting cavity and has a pressure relief side along its width. The pressure relief side and the wall of the mounting cavity form an exhaust channel communicating with the gas storage cavity. The first explosion-proof valve is located on the wall of the gas storage cavity and is used to discharge gas introduced into the gas storage cavity in the event of thermal runaway of the cell assembly. Through this structural design, the gas generated by thermal runaway can be released through the pressure relief side and concentrated into an independent gas storage cavity via the exhaust channel. When the activation value of the first explosion-proof valve is reached, the gas is discharged uniformly and orderly by the first explosion-proof valve, achieving efficient pressure relief. Therefore, this battery pack does not require additional exhaust space above the cells, thereby improving the cell arrangement efficiency and the overall energy density and performance of the battery pack. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a partial structural schematic diagram of the battery pack from a first-view perspective provided in this embodiment; Figure 2 for Figure 1 Top view; Figure 3 This is a schematic diagram of the battery cell assembly provided in this embodiment; Figure 4 This is a structural diagram of the box and crossbeam support provided in this embodiment; Figure 5 This is a schematic diagram of the structure of the beam support provided in this embodiment; Figure 6 This is another structural schematic diagram of the beam support provided in this embodiment; Figure 7 This is a schematic diagram of the structure of the crossbeam support provided in this embodiment, located between the battery cell assemblies.

[0018] Icons: 10-Battery pack; 100-Box; 110-Mounting cavity; 120-Crossbeam bracket; 121-Exhaust window; 123-Protrusion; 130-Gas storage cavity; 150-Exhaust passage; 300-Cell assembly; 301-Pressure relief side; 310-Cell; 311-Second explosion-proof valve; 330-Cable tie; 500-First explosion-proof valve. Detailed Implementation

[0019] In related technologies, the space in the height direction of the battery pack is compact, and the reserved venting gap will compress the usable space of the battery cells, reducing capacity and overall performance.

[0020] To address the aforementioned problems, this utility model provides a battery pack and electrical equipment that, by setting an exhaust channel between the battery cell assembly and the side wall of the casing, guides the gas to an independent gas storage chamber for unified discharge, thereby eliminating the need to reserve an exhaust gap above the battery cell and solving the problem of reduced battery cell capacity due to space constraints.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0026] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0027] The following describes in detail the overall structure, working principle, and technical effects of the battery pack and electrical equipment provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0028] Please see Figures 1 to 3 This utility model provides a battery pack 10 for use in electrical equipment. By setting an exhaust channel 150 between the cell assembly 300 and the side wall of the housing 100, the gas is guided to an independent gas storage chamber 130 for unified discharge, thus eliminating the need to reserve an exhaust gap above the cell 310 and solving the problem of reduced capacity of the cell 310 due to space constraints.

[0029] The battery pack 10 includes a housing 100, a cell assembly 300, and a first explosion-proof valve 500. The housing 100 has a mounting cavity 110 and a gas storage cavity 130 sequentially arranged along a first direction. The cell assembly 300 is located within the mounting cavity 110 and has a pressure relief side 301 along a second direction. It should be noted that the first direction is the length direction of the housing 100 (i.e., the direction of its length). Figure 1 The X direction shown is the first direction, and the second direction is the width direction of the box 100 (i.e., the X direction). Figure 1 (As shown in the Y direction).

[0030] Based on the above, an exhaust channel 150 is formed between the pressure relief side 301 and the cavity wall of the mounting cavity 110, and the exhaust channel 150 is connected to the gas storage cavity 130. The first explosion-proof valve 500 is located on the cavity wall of the gas storage cavity 130 and is used to discharge the gas guided into the gas storage cavity 130 through the exhaust channel 150 in the event of thermal runaway of the battery cell assembly 300.

[0031] With the above configuration, the gas generated by the cell assembly 300 during thermal runaway can be released through the pressure relief side 301 and concentrated into the independently configured gas storage chamber 130 via the exhaust channel 150, effectively avoiding safety hazards caused by disorderly gas diffusion. Simultaneously, the gas storage chamber 130 also serves as a buffer space, preventing a sudden increase in the overall internal pressure of the battery pack 10, further enhancing system safety. During thermal runaway, gas is discharged from the second explosion-proof valve 311 on the side of the cell assembly 300. After discharge, the gas collects in the gas storage chamber 130 at the rear of the housing 100 through the exhaust channels 150 on both sides. When the activation value of the first explosion-proof valve 500 is reached, the first explosion-proof valve 500 discharges the gas in the gas storage chamber 130 uniformly, achieving orderly pressure relief. Based on the above structural design, the battery pack 10 provided by this invention does not require additional exhaust space above the cell 310, thereby improving the arrangement efficiency of the cell 310 and the overall energy density and performance of the battery pack 10.

[0032] In some embodiments, both sides of the cell assembly 300 along the second direction are pressure relief sides 301, and the exhaust channels 150 correspond one-to-one with the pressure relief sides 301 and are all connected to the gas storage chamber 130. Based on this, in the event of thermal runaway, gas can be released from both sides simultaneously, significantly improving exhaust efficiency and pressure relief speed, while effectively reducing the risk of local pressure concentration, thereby further improving the overall safety, stability and thermal management capability of the battery pack 10.

[0033] Please refer to it again. Figure 3The battery cell assembly 300 includes multiple stacked battery cells 310, each of which is equipped with a second explosion-proof valve 311. Furthermore, all the second explosion-proof valves 311 are located on the pressure relief side 301 to ensure alignment and conduction with the exhaust channel 150, thereby improving the overall exhaust efficiency and providing a reliable structural basis for guiding subsequent gas to the gas storage chamber 130 and discharging it uniformly.

[0034] To enhance the overall structural strength and stability of the battery cell assembly 300, the assembly also includes multiple cable ties 330 for bundling and securing all the battery cells 310. Simultaneously, the cable ties 330 are spaced apart along a third direction, with the second explosion-proof valve 311 protruding from these intervals to prevent obstruction from affecting venting efficiency. It should be noted that the third direction refers to the height of the housing 100 (i.e.,...). Figure 3 (As shown in the Z direction).

[0035] Please see Figures 4 to 6 The battery pack 10 also includes a crossbeam bracket 120, which is connected to the bottom wall of the housing 100 and abuts against the cell assembly 300, thereby supporting and fixing the cell assembly 300 and enhancing the mechanical strength and stability of the internal structure of the battery pack 10. Simultaneously, the crossbeam bracket 120 is provided with an exhaust window 121 communicating with the exhaust channel 150. The cooperation between the exhaust window 121 and the exhaust channel 150 ensures that the gap between the cell assembly 300 and the side wall of the housing 100 is unobstructed, thereby achieving effective guidance and discharge of thermal runaway gases.

[0036] In some embodiments, the crossbeam bracket 120 can serve as a separator to functionally separate the battery cell 310 mounting area from the gas emission area. Specifically, the crossbeam bracket 120 divides the inner cavity of the housing 100 into a mounting cavity 110 and a gas storage cavity 130. Furthermore, the crossbeam bracket 120 connects the exhaust channel 150 and the gas storage cavity 130 via an exhaust window 121 to ensure that gas generated during thermal runaway can be promptly introduced into the gas storage cavity 130 through the exhaust channel 150, achieving orderly exhaust and preventing gas accumulation.

[0037] In other embodiments, such as Figure 7 As shown, when there are at least two battery cell assemblies 300 arranged along a first direction, the crossbeam support 120 abuts between two adjacent battery cell assemblies 300 along the first direction and connects to the exhaust channels 150 corresponding to the two adjacent battery cell assemblies 300 through the exhaust window 121. That is to say, in the first direction, the crossbeam support 120 and its exhaust window 121 can serve as a shared structure among multiple battery cell assemblies 300, which not only supports and positions the battery cell assemblies 300, but also effectively guides and orderly discharges thermal runaway gases.

[0038] Please refer to it again. Figure 5 and Figure 7To provide stable support for the multi-layer stacked battery cell assembly 300 and prevent displacement or tilting during vibration or thermal runaway, when there are at least two battery cell assemblies 300 arranged along a third direction, the crossbeam support 120 is provided with protrusions 123 extending on both sides along a first direction. The protrusions 123 abut against the space between two adjacent battery cell assemblies 300 along the third direction. As mentioned above, the third direction is the height direction of the housing 100 (i.e.,...). Figure 7 (As shown in the Z direction).

[0039] Furthermore, the exhaust window 121 corresponds one-to-one with the exhaust channel 150, ensuring that the thermal runaway gas generated by each battery cell assembly 300 or each pressure relief side 301 can be orderly introduced into the gas storage chamber 130 through the independent exhaust channel 150 and the corresponding exhaust window 121, avoiding gas cross-flow or interference between different areas.

[0040] For example, when two cell assemblies 300 are stacked along a third direction, and each cell assembly 300 has two pressure relief sides 301 on both sides along the second direction, a total of four pressure relief sides 301 are formed, and four exhaust windows 121 are correspondingly provided (e.g. Figure 6 As shown in the figure, this achieves one-to-one connection with each pressure relief side 301, thereby ensuring that each exhaust path is independent and does not interfere with each other, further enhancing the safety and exhaust reliability of the battery system under thermal runaway conditions.

[0041] In summary, this utility model provides a battery pack 10, which includes a housing 100, a cell assembly 300, and a first explosion-proof valve 500. The housing 100 has a mounting cavity 110 and a gas storage cavity 130 arranged sequentially along its length. The cell assembly 300 is disposed within the mounting cavity 110 and has a pressure relief side 301 in its width direction. An exhaust channel 150 communicating with the gas storage cavity 130 is formed between the pressure relief side 301 and the wall of the mounting cavity 110. The first explosion-proof valve 500 is disposed on the wall of the gas storage cavity 130 and is used to discharge gas introduced into the gas storage cavity 130 in the event of thermal runaway of the cell assembly 300. Through this structural design, the gas generated by thermal runaway can be released through the pressure relief side 301 and concentratedly introduced into the independent gas storage cavity 130 through the exhaust channel 150. When the activation value of the first explosion-proof valve 500 is reached, the gas is discharged uniformly and orderly by the first explosion-proof valve 500, achieving efficient pressure relief. Therefore, the battery pack 10 does not need to reserve additional venting space above the cell 310, thereby improving the cell 310 arrangement efficiency and the overall energy density and performance of the battery pack 10.

[0042] In addition, this utility model also provides an electrical device that includes the battery pack 10 described in the foregoing embodiment. Therefore, this electrical device also has the advantage of not needing to reserve additional venting space above the battery cell 310, thereby improving the arrangement efficiency of the battery cell 310 and the overall energy density and performance of the battery pack 10.

[0043] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery pack, characterized in that, include: The housing (100) has a mounting cavity (110) and an air storage cavity (130) sequentially arranged along a first direction, the first direction being the length direction of the housing (100); A battery cell assembly (300) is located in the mounting cavity (110) and has a pressure relief side (301) along a second direction. An exhaust channel (150) is formed between the pressure relief side (301) and the cavity wall of the mounting cavity (110). The exhaust channel (150) is connected to the gas storage cavity (130). The second direction is the width direction of the housing (100). The first explosion-proof valve (500) is disposed on the cavity wall of the gas storage chamber (130) and is used to discharge the gas guided into the gas storage chamber (130) through the exhaust channel (150) in the event of thermal runaway of the battery cell assembly (300).

2. The battery pack according to claim 1, characterized in that, The battery cell assembly (300) includes a plurality of stacked battery cells (310), each of the battery cells (310) is provided with a second explosion-proof valve (311), and all the second explosion-proof valves (311) are located on the pressure relief side (301).

3. The battery pack according to claim 2, characterized in that, The battery cell assembly (300) also includes a plurality of cable ties (330) for bundling and securing all the battery cells (310); the plurality of cable ties (330) are spaced apart along a third direction, and the second explosion-proof valve (311) protrudes from the spaced positions; wherein, the third direction is the height direction of the housing (100).

4. The battery pack according to claim 2, characterized in that, The battery cell assembly (300) has two pressure relief sides (301) along the second direction. The exhaust channel (150) corresponds to the pressure relief side (301) and is connected to the gas storage chamber (130).

5. The battery pack according to any one of claims 1 to 4, characterized in that, The battery pack (10) also includes a crossbeam bracket (120), which is connected to the bottom wall of the housing (100) and abuts against the cell assembly (300); and the crossbeam bracket (120) is provided with an exhaust window (121) that communicates with the exhaust channel (150).

6. The battery pack according to claim 5, characterized in that, When there are at least two battery cell assemblies (300) arranged along the first direction, the crossbeam bracket (120) abuts between two adjacent battery cell assemblies (300) along the first direction and connects the exhaust channels (150) corresponding to the two adjacent battery cell assemblies (300) through the exhaust window (121).

7. The battery pack according to claim 5, characterized in that, The crossbeam support (120) divides the inner cavity of the box (100) into the mounting cavity (110) and the air storage cavity (130), and connects the exhaust channel (150) and the air storage cavity (130) through the exhaust window (121).

8. The battery pack according to claim 5, characterized in that, When there are at least two battery cell assemblies (300) arranged along a third direction, the crossbeam bracket (120) is provided with protrusions (123) protruding on both sides along a first direction, the protrusions (123) abutting between two adjacent battery cell assemblies (300) along the third direction, wherein the third direction is the height direction of the housing (100).

9. The battery pack according to claim 5, characterized in that, The exhaust window (121) corresponds one-to-one with the exhaust channel (150).

10. An electrical appliance, characterized in that, Includes the battery pack (10) as described in any one of claims 1 to 9.

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