Battery pack and electric device

Abstract

The battery pack comprises a box body, the box body comprises a bottom cover, a frame, a cross beam and an upper cover, the frame is arranged between the bottom cover and the upper cover, the frame, the bottom cover and the upper cover jointly define a box body space, the cross beam is arranged in the box body space, and the two ends of the cross beam are fixedly assembled with the two opposite sides of the frame in the first direction respectively; the battery cell module is arranged in the box body space, and a battery cell explosion-proof valve is arranged on the battery cell module; the frame anti-explosion valve is arranged on the frame; wherein a fluid channel is formed in the cross beam, an air hole is formed in the surface of the cross beam, the fluid channel is communicated with the box body space through the air hole, the frame anti-explosion valve is located at the assembly position of the frame and the cross beam, and the frame anti-explosion valve is arranged at a port of the fluid channel and communicated with the fluid channel. According to the technical scheme provided by the utility model, the technical problems in the prior art that the risks of electrical insulation failure, arc discharge short circuit and the like are increased when the battery cell is in thermal runaway can be solved.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, and in particular to a battery pack and an electrical device. Background Technology

[0002] Battery packs are typically equipped with explosion-proof valves. When a cell experiences thermal runaway, high-temperature gas is sprayed directly at the top cover. The high-temperature gas eventually enters the sealed cavity formed by the cover and the body of the battery pack, and is finally discharged through the explosion-proof valve, thus expelling the high-temperature gas from the battery pack.

[0003] However, this would result in the storage of a large amount of high-temperature gas inside the battery pack, increasing the risk of electrical insulation failure, arcing, and short circuits. Utility Model Content

[0004] This invention provides a battery pack and an electrical device, which aims to effectively solve the technical problem that the occurrence of thermal runaway in battery cells increases the risk of electrical insulation failure, arcing and short circuits.

[0005] According to a first aspect of this utility model, a battery pack is provided, comprising: a housing, the housing including a bottom cover, a frame, a crossbeam, and a top cover, the frame being disposed between the bottom cover and the top cover, and the three together forming a housing space; the crossbeam being disposed within the housing space, and both ends of the crossbeam being fixedly assembled to opposite sides of the frame in a first direction; a battery cell module disposed within the housing space, and the battery cell module being provided with a battery cell explosion-proof valve; and a frame explosion-proof valve disposed on the frame; wherein, a fluid channel is opened inside the crossbeam, and an air hole is opened on the surface of the crossbeam, the fluid channel being connected to the housing space through the air hole; the frame explosion-proof valve is located at the assembly point of the frame and the crossbeam, and the frame explosion-proof valve is disposed at the port of the fluid channel and communicating with the fluid channel.

[0006] Furthermore, the battery pack also includes: a pressure strip, which is disposed in the housing and fixedly assembled with the cell module and the crossbeam; the pressure strip has an exhaust channel inside, which is connected to the fluid channel through the air hole; the pressure strip has an air intake structure, which is connected to the exhaust channel.

[0007] Furthermore, the air intake structure is located on the side of the pressure bar near the cell explosion-proof valve.

[0008] Furthermore, the battery pack also includes: structural adhesive, which is used to bond the pressure strip and the cell module, and the structural adhesive is also used to bond the pressure strip and the crossbeam.

[0009] Furthermore, the bonding point between the pressure strip and the battery cell module is located on the shoulder of the battery cell module, and the air intake structure of the pressure strip is directly opposite the battery cell explosion-proof valve. The air intake structure is a hollow structure or a perforated structure.

[0010] Furthermore, a gas channel is provided inside the frame, and the gas channel is connected to the fluid channel provided in the crossbeam.

[0011] Furthermore, the crossbeam includes: a front crossbeam, a middle crossbeam, and a rear crossbeam arranged in parallel; the front crossbeam, the middle crossbeam, and the rear crossbeam are all fixedly assembled with the frame, the front crossbeam, the middle crossbeam, and the rear crossbeam are all provided with fluid channels, and the pressure strip is fixedly assembled with the front crossbeam, the middle crossbeam, and the rear crossbeam, and the exhaust channel of the pressure strip is connected to the fluid channels of the front crossbeam, the middle crossbeam, and the rear crossbeam, and the frame explosion-proof valve is provided at the assembly point of the front crossbeam, the middle crossbeam, or the rear crossbeam and the frame.

[0012] Furthermore, in the direction from the bottom cover to the top cover, the thickness of the pressure strip is 10mm-30mm, and in the direction from one end of the crossbeam to the other end of the frame, the width of the pressure strip is 60mm-200mm.

[0013] Furthermore, the pressure strip is a mica pressure strip or a metal pressure strip.

[0014] According to a second aspect of the present invention, the present invention also provides an electrical device comprising the battery pack described in any of the preceding claims.

[0015] Through one or more embodiments of the above-described embodiments of this utility model, at least the following technical effects can be achieved:

[0016] In the technical solution disclosed in this utility model, when the battery cell experiences thermal runaway, the high-temperature gas ejected from the cell explosion-proof valve, after entering the housing space, no longer accumulates in the housing space, but is introduced into the fluid channel through the air holes of the crossbeam. The gas in the fluid channel can be discharged through the frame explosion-proof valve, thereby reducing the high-temperature gas stored in the battery pack and reducing the risks of electrical insulation failure, arcing, and short circuits. Attached Figure Description

[0017] The technical solution and other beneficial effects of this utility model will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0018] Figure 1 A schematic diagram of the structure of the battery pack under explosion treatment of the top cover provided in an embodiment of this utility model;

[0019] Figure 2An exploded view of the frame and crossbeam of the battery pack provided in an embodiment of this utility model;

[0020] Figure 3 An assembly diagram of the frame, crossbeam, and pressure strip of the battery pack provided in an embodiment of this utility model;

[0021] Figure 4 A schematic diagram of the structure of the pressure strip of the battery pack provided in this embodiment of the utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the battery pack for which the pressure strip and structural adhesive have undergone explosive treatment, as provided in an embodiment of this utility model. Attached image description:

[0024] 1. Enclosure; 11. Bottom cover; 12. Frame; 13. Crossbeam; 14. Top cover; 15. Enclosure space; 2. Battery cell module; 3. Frame explosion-proof valve; 4. Pressure strip; 41. Air intake structure; 42. Adhesive surface; 43. Exhaust hole; 5. Structural adhesive; 131. Fluid channel; 132. Air hole; 103. Front crossbeam; 113. Middle crossbeam; 123. Rear crossbeam. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0027] Battery packs are typically equipped with explosion-proof valves. When a cell experiences thermal runaway, high-temperature gas is sprayed directly at the top cover. The high-temperature gas eventually enters the sealed cavity formed by the cover and the body of the battery pack, and is finally discharged through the explosion-proof valve, thus expelling the high-temperature gas from the battery pack.

[0028] However, the above solution has the following drawbacks: it requires spraying or attaching mica sheets to the inner surface of the top cover for protection, increasing costs. Furthermore, the entry of high-temperature gases during thermal runaway into the battery pack can lead to electrical insulation failure, arcing, and short circuit risks, resulting in lower thermal runaway safety.

[0029] Therefore, this utility model provides a battery pack and a power-consuming device that can solve the above-mentioned shortcomings, as detailed below:

[0030] Figure 1 The battery pack shown is provided in an embodiment of the present invention, including: a housing 1, a cell module 2, and a frame explosion-proof valve 3. The housing 1 includes a bottom cover 11, a frame 12, a crossbeam 13, and a top cover 14. The frame 12 is disposed between the bottom cover 11 and the top cover 14, and the three together enclose a housing space 15. The crossbeam 13 is disposed within the housing space 15, and both ends of the crossbeam 13 are fixedly assembled to opposite sides of the frame 12 in a first direction. In this embodiment, the first direction can be any direction. Figure 1 Taking the Y-direction as an example, the cell module 2 is set in the box space 15 of the box 1, and the cell module 2 is equipped with a cell explosion-proof valve; the frame explosion-proof valve 3 is set in the frame 12.

[0031] In this embodiment, a fluid channel 131 is provided inside the crossbeam 13, and an air hole 132 is provided on the surface of the crossbeam 13. The fluid channel 131 is connected to the box space 15 through the air hole 132. The frame explosion-proof valve 3 is located at the assembly point of the frame 12 and the crossbeam 13, and the frame explosion-proof valve 3 is located at the port of the fluid channel 131 and is connected to the fluid channel 131.

[0032] The frame 12 has a vent, and the frame explosion-proof valve 3 is set at the vent to control the opening or closing of the vent. The vent is connected to the fluid channel 131 of the crossbeam 13, so that the frame explosion-proof valve 3 and the fluid channel 131 are connected.

[0033] In the battery pack provided in this embodiment, when the battery cell experiences thermal runaway, the high-temperature gas ejected from the cell explosion-proof valve, after entering the housing space 15, no longer accumulates in the housing space 15, but is guided into the fluid channel 131 through the air hole 132 of the crossbeam 13. The gas in the fluid channel 131 can be discharged through the frame explosion-proof valve 3, thereby reducing the high-temperature gas stored in the battery pack and reducing the risks of electrical insulation failure, arcing short circuit, etc.

[0034] In some embodiments, the battery pack further includes a pressure strip 4, which is disposed on the housing 1 and extends along a second direction, and is fixedly assembled with the cell module 2 and the crossbeam 13. In this embodiment, the second direction can be any direction. Figure 1 Taking the X direction as an example, the pressure strip 4 has an exhaust channel inside, which is connected to the fluid channel 131 through the air hole 132. The pressure strip 4 has an air intake structure 41, which is connected to the fluid channel 131.

[0035] In this embodiment, the air intake structure 41 of the pressure strip 4 is connected to the box space 15. The pressure strip 4 is also provided with an exhaust hole 43, which corresponds to the air hole 132 of the crossbeam 13, so that the exhaust channel of the pressure strip 4 is connected to the fluid channel 131 of the crossbeam 13, and the fluid channel 131 of the crossbeam 13 is also connected to the box space 15 through the pressure strip 4.

[0036] In the battery pack provided in this embodiment, when the battery cell experiences thermal runaway, the high-temperature gas ejected from the cell explosion-proof valve, after entering the housing space 15, no longer accumulates in the housing space 15. Instead, it enters the exhaust channel of the pressure bar 4 from the air intake structure 41 of the pressure bar 4, and then passes through the fluid channel 131 of the crossbeam 13. The gas in the fluid channel 131 can be discharged through the frame explosion-proof valve 3, thereby further reducing the high-temperature gas stored in the battery pack and reducing the risks of electrical insulation failure, arcing, and short circuits.

[0037] In some embodiments, the air intake structure 41 is disposed on the side of the pressure bar 4 near the cell explosion-proof valve.

[0038] In this embodiment, the air intake structure 41 is set on the side of the pressure bar 4 near the cell explosion-proof valve. This allows the high-temperature gas to be sprayed directly onto the pressure bar 4 when the cell explosion-proof valve sprays high-temperature gas. The gas is then sprayed into the exhaust channel of the pressure bar 4 through the air intake structure 41, and then discharged through the fluid channel 131 of the crossbeam 13 to the frame explosion-proof valve 3. This greatly reduces the probability of storing high-temperature gas in the housing space 15, thereby further reducing the risks of electrical insulation failure, arcing and short circuit.

[0039] In some embodiments, the battery pack further includes: structural adhesive 5, which is used to bond the pressure strip 4 and the cell module 2, and also to bond the pressure strip 4 and the crossbeam 13.

[0040] In this embodiment, structural adhesive 5 is used to bond the pressure strip 4 and the cell module 2. This not only fixes the position of the pressure strip 4, but also improves the structural rigidity of the cell module 2, thereby improving the modality of the entire battery pack.

[0041] In some embodiments, the bonding point between the pressure strip 4 and the battery cell module 2 is located at the shoulder of the battery cell module 2, and the air intake structure 41 of the pressure strip 4 is directly opposite the battery cell explosion-proof valve. The air intake structure 41 is a hollow structure or a hole structure.

[0042] In this embodiment, the pressure strip 4 has an adhesive surface 42, which is used to bond the pressure strip 4 to the shoulder of the battery cell. This not only fixes the position of the pressure strip 4 but also does not affect the use of the battery cell. Furthermore, the air intake structure 41 of the pressure strip 4 is aligned with the pressure relief valve of the battery cell. This allows the high-temperature gas to be directly sprayed onto the air intake structure 41 of the pressure strip 4 when the explosion-proof valve of the battery cell sprays high-temperature gas. The gas then passes through the exhaust channel of the pressure strip 4 and the fluid channel 131 of the crossbeam 13 before being discharged to the explosion-proof valve 3 on the frame. This greatly reduces the probability of storing high-temperature gas in the housing space 15, thereby further reducing the risks of electrical insulation failure, arcing, and short circuits.

[0043] In addition, during thermal runaway, the high-temperature gas ejected by the cell explosion-proof valve enters the exhaust channel of the pressure bar 4 directly from the air intake structure 41 of the pressure bar 4, so that there is no or only a very small amount of high-temperature gas in the box space 15, and there will be no accumulation of high-temperature gas in the box space 15. This eliminates the need for the insulation and thermal protection set inside the top cover 14 used in traditional battery packs, and reduces the voltage resistance rating of the top cover 14, thereby reducing the cost of the battery pack top cover 14.

[0044] In some embodiments, a gas channel is provided inside the frame 12, and the gas channel is connected to the fluid channel 131 provided in the crossbeam 13.

[0045] In this embodiment, by setting a gas channel inside the frame 12, when the cell explosion-proof valve sprays high-temperature gas, the high-temperature gas passes through the exhaust channel of the pressure strip 4 and the fluid channel 131 of the crossbeam 13 into the gas channel of the frame 12. When the high-temperature gas in the gas channel has a certain amount, it will be discharged from the frame explosion-proof valve 3.

[0046] In some embodiments, the crossbeam 13 includes a front crossbeam 103, a middle crossbeam 113, and a rear crossbeam 123 arranged in parallel; the front crossbeam 103, the middle crossbeam 113, and the rear crossbeam 123 are all fixedly assembled with the frame 12, the front crossbeam 103, the middle crossbeam 113, and the rear crossbeam 123 are all provided with fluid channels 131, and the pressure strip 4 is fixedly assembled with the front crossbeam 103, the middle crossbeam 113, and the rear crossbeam 123, and the exhaust channel of the pressure strip 4 is connected to the fluid channels 131 of the front crossbeam 103, the middle crossbeam 113, and the rear crossbeam 123, and the frame explosion-proof valve 3 is disposed at the assembly point of the front crossbeam 103, the middle crossbeam 113, the rear crossbeam 123, and the frame 12.

[0047] In this embodiment, when the battery cell experiences thermal runaway, the high-temperature gas ejected by the battery cell explosion-proof valve enters the exhaust channel of the pressure bar 4. The gas then enters the fluid channels 131 of the front crossbeam 103, the middle crossbeam 113, and the rear crossbeam 123 through the exhaust channels. The gas is then transported to the gas channel of the frame 12 through the fluid channels 131 and discharged to the outside of the housing through the frame explosion-proof valve 3.

[0048] In some embodiments, the thickness of the pressure strip 4 is 10mm-30mm in the direction from the bottom cover 11 to the top cover 14; and the width of the pressure strip 4 is 60mm-200mm in the direction from one end of the crossbeam 13 that is fitted with the frame 12 to the other end. The pressure strip 4 is a mica pressure strip 4 or a metal pressure strip 4.

[0049] In this embodiment, the pressure strip 4 has a certain height and rigidity, and can serve as a support component to replace the support foam set between the battery cell and the top cover 14 in the traditional battery pack, thereby further reducing the cost of the battery pack.

[0050] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A battery pack, characterized by, The battery pack comprises: a box body comprising a bottom cover, a frame, a crossbeam and an upper cover, the frame being arranged between the bottom cover and the upper cover, and the three together enclosing a box space, the crossbeam being arranged in the box space, and the two ends of the crossbeam being fixedly assembled with the frame on the opposite sides in a first direction; a battery cell module arranged in the box space, and the battery cell module being provided with a battery cell explosion-proof valve; a frame explosion-proof valve arranged in the frame; wherein a fluid channel is formed in the crossbeam, and gas holes are formed on the surface of the crossbeam, the fluid channel being in communication with the box space through the gas holes, the frame explosion-proof valve being arranged at the port of the fluid channel and in communication with the fluid channel.

2. The battery pack of claim 1, wherein the battery pack further comprises a pressing strip arranged in the box body and extending in a second direction, and fixedly assembled with the battery cell module and the crossbeam; an exhaust channel is formed in the pressing strip, the exhaust channel being in communication with the fluid channel through the gas holes, and the pressing strip is provided with an air inlet structure in communication with the exhaust channel.

3. The battery pack of claim 2, wherein the air inlet structure is arranged on the side of the pressing strip close to the battery cell explosion-proof valve.

4. The battery pack of claim 2, wherein the battery pack further comprises a structural adhesive for bonding the pressing strip and the battery cell module, and the structural adhesive is also used for bonding the pressing strip and the crossbeam.

5. The battery pack of claim 4, wherein the bonding part of the pressing strip and the battery cell module is located at the cell shoulder of the battery cell module, and the air inlet structure of the pressing strip is directly opposite the battery cell explosion-proof valve, and the air inlet structure is a hollow structure or a hole structure.

6. The battery pack of claim 2, wherein a gas channel is formed in the frame, and the gas channel is in communication with the fluid channel formed in the crossbeam.

7. The battery pack of claim 6, wherein the crossbeam comprises a front crossbeam, a middle crossbeam and a rear crossbeam arranged in parallel; the front crossbeam, the middle crossbeam and the rear crossbeam are fixedly assembled with the frame, the front crossbeam, the middle crossbeam and the rear crossbeam are all provided with fluid channels, the pressing strip is fixedly assembled with the front crossbeam, the middle crossbeam and the rear crossbeam, the exhaust channel of the pressing strip is in communication with the fluid channels of the front crossbeam, the middle crossbeam and the rear crossbeam, and the frame explosion-proof valve is arranged at the assembly part of the front crossbeam or the middle crossbeam or the rear crossbeam and the frame.

8. The battery pack of claim 2, wherein in the direction from the bottom cover to the upper cover, the thickness of the pressing strip is 10-30 mm; in the direction from one end of the crossbeam assembled with the frame to the other end, the width of the pressing strip is 60-200 mm.

9. The battery pack of claim 2, wherein the pressing strip is a mica pressing strip or a metal pressing strip.

10. An electrical device, characterized by The battery pack comprises any one of claims 1-9.

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